JP6550218B2 - Operation code, shielding device - Google Patents

Description

  The present invention relates to a shielding device such as a horizontal blind, a raised curtain, a pleated screen, a roll screen, and an operation cord used to open and close a shielding member of the shielding device.

  In the solar radiation shielding device, an endless operation cord is hooked on an operation pulley rotatably supported at one end of the head box, and the solar radiation shielding is performed by operating the operation cord to rotate the operation pulley. There is one that raises and lowers the material. When such an endless operation cord is suspended from the operation pulley, the endless edge of the operation cord may be caught by a resident or other moving object moving in the room.

  Therefore, the endless operation cord has a fail-safe function to ensure the safety of the occupant by being separated by the pulling force when an excessive pulling force that exceeds the pulling force acting during normal operation is applied. There are some which are provided with a connection part (patent documents 1-2).

  In Patent Document 1, when the connecting portion is engaged with the operating pulley, the operating pulley may be used to solve the problem that the connecting portion may not be separated properly even if a large force is applied to the operating cord. Two connection parts are provided at intervals of the engaging length or more. Such a configuration solves the above-mentioned problem, since at least one of the two connections is not engaged with the operating pulley.

  In Patent Document 2, a connecting member for connecting both ends of the operation cord is provided with a stopper that can move up and down in the connecting member, and the holding force is changed according to the direction of the connecting member. Such a configuration provides a safety mechanism that is difficult to separate when the shielding member is moved up and down, and easy to separate when the shielding member is stopped at the raised position.

JP, 2011-6929, A Patent 4832180 gazette

Although the safety is secured at a high level also in Patent Literatures 1 and 2, when the inventors examined to further enhance the safety, they noticed the following points.
In patent document 1, although two connection parts are provided, the holding power of each connection part needs to make it the magnitude | size which does not remove | deviate at the time of raising / lowering operation of a solar radiation shielding material, but such a holding power If adopted, the operation code may not be separated at the connection when the operation code is caught by a light force. Moreover, in patent document 2, the case where it catches on the operation code by a light force in the state with strong holding power of a connection member is also assumed, and in that case, the operation code may not be separated in a connection part.

  Thus, in the prior art, although the safety is secured at a high level, there is room for further improvement.

  The present invention has been made in view of such circumstances, and provides a shielding device with enhanced safety, and an operation cord used to open and close a shielding material of the shielding device.

  According to the present invention, the operating cord is mounted on the operating pulley and used to rotate the operating pulley to open and close the shielding member, and the operating cord has a separating force of a size exceeding the holding force. The connector includes at least two connectors separated when it is applied, and the connectors are configured to change the holding force depending on the direction in which the connectors are directed, and the connectors are hung on the operation pulley An operating cord is provided, arranged in such a way that, when at least one of the connections is in a high holding state, another at least one of the connections is in a low holding state. .

  In many shield devices, the maximum tension applied to one of the two parts of the operation cord suspended from the operation pulley is larger than the maximum tension applied to the other (the higher tension part is the higher tension part). The lower tension part is the lower tension part). The inventor uses the difference in the maximum tension to configure the connection portion so that the holding force of the connection portion changes depending on the direction in which the connection portion is directed, and when the connection portion is located in the high tension portion It was conceived to be in a high holding force state, and to be in a low holding force state when the connecting part is located in the low tension portion. In addition, the operating cord is provided with at least two connections, which are arranged in such a way that at least one of the connections is in a high holding force and at least one of the connections is in a low holding force. By doing so, I came up with the idea that there is always a connection in a low holding state. According to such a configuration, the connection portion in the low holding force state is not separated in the normal operation, but is easily separated when a relatively small force is applied from the outside, and therefore the operation cord is caught by the light force Even in this case, the connection is surely separated and the safety is enhanced.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with one another.
Preferably, the operation cord includes n (n is 3 or more) coupling portions, and the n coupling portions have a distance between two closest coupling portions that is greater than half of the outer circumference of the operation pulley. Even arranged to be separated.
Preferably, the connection portion includes a movable member movable in accordance with a change in a direction in which the connection portion is directed, and the holding force is changed in accordance with the movement of the movable member.
Preferably, the engagement portion of the connection portion is configured to be disengaged by spreading outward in the radial direction of the operation cord, and the moving member is configured to engage the engagement from the outer peripheral side of the engagement portion. By regulating / non-regulating the deformation in the direction in which the joint portion spreads, the holding force of the connecting portion is changed.

Further, according to the present invention, there is provided a shielding device for rotating the operation pulley to open and close the shielding material by operating the operation code hooked on the operation pulley, wherein the operation code is the above operation code, shielding An apparatus is provided.
Preferably, the maximum tension applied to one of the two portions of the operation cord suspended from the operation pulley is larger than the maximum tension applied to the other, and the portion with the larger maximum tension is a high tension portion. The portion where the maximum tension is smaller is a low tension portion, and the connecting portion is in a high retention state when positioned in the high tension portion and low retention when positioned in the low tension portion. It is configured to be in a force state.
Preferably, the holding force of the connection portion in the high holding force state is larger than the maximum tension applied to the high tension portion, and the holding force of the connection portion in the low holding force state is the maximum applied to the low tension portion Greater than tension.
Preferably, a one-way clutch is provided that does not transmit the rotation of the operation pulley in the direction to lower the shielding material to a drive shaft for opening and closing the shielding material.
Preferably, the connecting portion includes a movable member movable with a change in the direction in which the connecting portion is directed, and the holding force is changed with the movement of the movable member. The movement is configured to be facilitated by the movement facilitating member.

  According to another aspect of the present invention, there is provided a shielding device for rotating the operating pulley to open and close the shielding material by operating the operating cord hooked on the operating pulley, wherein the operating cord has a size exceeding the holding force. A connecting portion that is separated when a separating force is applied, and the connecting portion is configured to change the holding force with the movement of the moving member at the position where the operation code is turned, the moving member A shielding device is provided, configured to be facilitated by the movement facilitating member. In this case, the number of connection parts may be one.

It is a front view of the pleat screen of a 1st embodiment of the present invention. It is a right side view of the pleat screen of FIG. FIG. 2 is a cross-sectional view showing a configuration of a transmission clutch 21. FIG. 2 is a cross-sectional view showing a configuration of a transmission clutch 21. FIG. 6 is an exploded perspective view showing a configuration of a transmission clutch 21. FIG. 2 is a cross-sectional view showing a configuration of a transmission clutch 21. FIG. 2 is a cross-sectional view showing a configuration of a transmission clutch 21. It is a sectional view showing the composition of a stopper device. It is an expanded view which shows the stopper guide groove of a stopper apparatus. The ball chain 13 of 1st Embodiment of this invention is shown, (a) shows the state in which main cords 13a and 13b and connecting parts 17a and 17b are separated, and (b) shows the state where these are connected. (A)-(b) is an enlarged view of area | region X of FIG. 10 (a), and Y, respectively. It is a perspective view of the connection part 17a of Fig.11 (a). It is a front view of the 1st connection member 41a. It is a top view of the 1st connection member 41a. It is a side view of the 1st connection member 41a. It is CC sectional drawing of FIG. It is a front view of the 2nd connection member 42. As shown in FIG. It is a rear view of the 2nd connection member 42. As shown in FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is FF sectional drawing of FIG. It is sectional drawing which shows the fitting state of the 1st connection member 41a and the 2nd connection member 42. As shown in FIG. (A)-(b) is a figure corresponding to FIG. 11, and shows the state in which the connection part 17a is in the low holding force state, and the connection part 17b is in the high holding force state. A state where the bottom rail 5 is raised by rotating the ball chain 13 by half a turn from the state of FIG. 2 is shown. The connection parts 17a and 17b of the ball chain 13 of 2nd Embodiment of this invention are shown. The operation code 14 of 3rd Embodiment of this invention is shown, (a) shows the state in which main code 14a, 14b and connection part 17a, 17b are isolate | separated, (b) shows the state which these were connected. (A)-(b) is an enlarged view of field X of Drawing 26 (b), and Y, respectively. The ball chain 13 of 4th Embodiment of this invention is shown, (a) shows the state in which main cords 13a and 13b and connecting parts 17a and 17b are separated, and (b) shows the state where these are connected. It is a perspective view which shows the connection structure of main cords 13a and 13b and connection parts 17a and 17b. A ball chain according to a fifth embodiment of the present invention, in which (a) shows the state in which the connection portion 17b in the low holding force state is fitted to the operation pulley 11, and (b) shows that the number of connection portions is three. 13 shows (c) a state in which the ball chain 13 of (b) is hung on the operation pulley 11. The modification of the ball chain 13 of 5th Embodiment of this invention is shown. It is a figure corresponding to FIG. 2 for demonstrating the operating method of the solar radiation shielding apparatus of 6th Embodiment of this invention. It is a perspective view of the connection part 17a of the ball chain 13 of 8th Embodiment of this invention. The state which the ball chain 13 of 9th Embodiment of this invention is hung on the operation pulley 11 is shown, (a) is the connection part 17a in the low holding power state, (b) is the connection part 17a is the high holding power state. Indicates that it is The state which the ball chain 13 of 9th Embodiment of this invention is hung on the lower pulley 64 is shown, (a) is a high holding force state of the connection part 17a, (b) is a low holding force state of the connection part 17a. Indicates that it is The member which comprises the connection part 17a of the operation cord 14 of 10th Embodiment of this invention is shown, (a) is a disassembled sectional view, (b) is a disassembled perspective view of the holding force switching unit 100. FIG. The connection part 17a of the operation code 14 of 10th Embodiment of this invention is shown, (a) shows the connection part 17a in the high retention state, (b) shows the connection part 17a in the low retention state. . The connection part 17a of the ball chain 13 of 11th Embodiment of this invention is shown, (a) shows the connection part 17a in the high holding force state, (b) shows the state that the connection part 17a is in the low holding force state. . In the eleventh embodiment of the present invention, a state in which the movement of the moving member 40 is promoted by the mode switching pulley 66 is shown, (a) shows the connecting part 17a in a low holding force state, (b) shows the connecting part 17a in high holding Indicates a force state. In the eleventh embodiment of the present invention, a state is shown in which the movement of the moving member 40 is promoted by the tapered surface 64 d provided on the lower pulley 64.

  Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments described below can be combined with one another. In addition, the invention is established independently for each feature. In the following description, "ball chain" can be read as "operation code" as appropriate, and the pleated screen can be read as "sunlight shielding device" as appropriate.

1. First Embodiment In the pleated screen of the first embodiment of the present invention shown in FIGS. 1 to 2, the screen 4 is suspended from the head box 1 and the bottom rail 5 is attached to the lower end of the screen 4. The screen 4 is such that the fabric can be folded in a zigzag manner.

  Between the head box 1 and the bottom rail 5, a pitch holding cord 39 for holding the pitch of the folds of the screen 4 is provided. A large number of annular holding parts 57 are provided on the pitch holding cord 39 at equal intervals, and after the holding parts 57 are inserted through the screen 4, the raising and lowering cords 7 for raising and lowering the bottom rail 5 are held. , And the holding portion 57 is prevented from coming off the screen 4, thereby enabling pitch holding of the screen 4. The pitch holding cord 39 and the raising and lowering cord 7 are disposed on opposite sides of the screen 4.

  The pitch holding cord holding member 56 holding the pitch holding cord 39 and the elevating cord holding member 55 holding the elevating cord 7 are attached to the bottom rail 5. The pitch holding cord 39 and the lifting cord 7 are attached to the bottom rail 5 by these holding members.

  The upper end of the lifting cord 7 is attached to the winding shaft 10. The winding shaft 10 rotates with the drive shaft 12. At one end of the head box 1, an operation unit unit 23 provided with a ball chain 13, an operation pulley 11 and a transmission clutch 21 is provided. The ball chain 13 is hooked on the operation pulley 11, and the rotational force in the pulling direction (the direction of arrow A in FIG. 1) of the bottom rail 5 applied to the operation pulley 11 by the ball chain 13 is transmitted via the transmission clutch 21. It is transmitted to the drive shaft 12. The transmission clutch 21 transmits torque in the direction of arrow A in FIG. 1 but does not transmit torque in the direction of arrow B in FIG. 1 to the drive shaft 12.

  Here, an example of a specific mechanism (one wake clutch) in which the transmission clutch 21 transmits only rotation in one direction will be described with reference to FIGS. 3 to 7. The mechanism shown below is an example, and as long as the transmission clutch 21 has the same function, it may have another mechanism.

  The shaft 71 is non-rotatably supported relative to the head box 1. The drive drum 72 is rotatably and axially immovably supported relative to the shaft 71. The rotational force applied to the operation pulley 11 is transmitted to the drive drum 72 via a drive gear (not shown) integrally rotating with the operation pulley 11 and a transmission gear 89 shown in FIG. 5 meshing with the drive gear.

  A clutch drum 73 is rotatably and axially movably supported relative to the shaft 71 adjacent to the drive drum 72. As shown in FIG. 5, the clutch drum 73 has a guide groove 74 formed on the outer peripheral surface thereof, and the guide groove 74 is formed by offsetting the engagement groove 75 and the release groove 76 in the axial direction.

  A slip spring 77 is disposed between the drive drum 72 and the clutch drum 73. The clutch drum 73 is biased in a direction away from the drive drum 72, that is, in the direction of arrow E shown in FIG.

  A collar 78 is non-rotatably fitted on the shaft 71 adjacent to the clutch drum 73, and a stop spring 79 is wound around the outer peripheral surface of the collar 78. As shown in FIG. 4, both end portions 80a and 80b of the stop spring 79 are bent in the radial direction, and an engaging portion 73a of the clutch drum 73 is projected between the both end portions 80a and 80b.

  Then, when the engagement portion 73a abuts on either of the end portions 80a and 80b of the stop spring 79, the friction between the stop spring 79 and the collar 78 is increased, and the rotation of the clutch drum 73 is blocked. ing.

  Around the clutch drum 73, a rotating drum 81 is rotatably and axially movably supported. The rotary drum 81 is formed with an engagement recess 82 opened to the drive drum 72 side, and an engagement projection 83 formed on the drive drum 72 is engaged with the engagement recess 82. Accordingly, the rotary drum 81 is rotated integrally with the drive drum 72.

  On the inner peripheral surface of the rotary drum 81, a hemispherical clutch convex portion 84 engaged with the guide groove 74 of the clutch drum 73 is formed. Then, when the rotary drum 81 rotates, the clutch convex portion 84 is guided by the guide groove 74, and the rotary drum 81 moves in the axial direction.

  On the inner peripheral surface of the rotary drum 81, an engaging portion 85 that abuts on the end portions 80a and 80b of the stop spring 79 is formed. When the engaging portion 85 engages with either of the end portions 80a and 80b, the friction between the stop spring 79 and the collar 78 is reduced, and the stop spring 79 and the clutch drum 73 are integrally rotated with the rotating drum 81. Ru.

  The transmission drum 86 is rotatably and axially immovably supported at the tip of the shaft 71. A pair of serrated driven engagement teeth 87 are formed on the proximal end surface of the transmission drum 86, that is, the end surface facing the rotary drum 81.

  A pair of serrated drive engagement teeth 88 are formed on the end surface of the rotary drum 81, that is, the end surface facing the transmission drum 86. Then, when the rotary drum 81 is rotated and moved to the transmission drum 86 side, the drive engagement tooth 88 engages with the driven engagement tooth 87, and the rotary drum 81 and the transmission drum 86 are integrally rotated. Further, on the side of the take-up shaft in the axial direction of the transmission drum 86, concave portions (four in this example) are provided and fitted to the output shaft 21a. The output shaft 21a is fitted to the drive shaft 12, and the rotation of the transmission drum 86 is transmitted to the drive shaft 12 via the output shaft 21a.

  Further, as shown in FIGS. 6 and 7, when the rotary drum 81 moves to the drive drum 72 side, the engagement between the drive locking teeth 88 and the driven locking teeth 87 is released, and the transmission drum 86 is freely It becomes possible to rotate. The transmission drum 86 is connected to rotate integrally with the drive shaft 12.

Next, the operation of the transmission clutch 21 will be described.
When the operation pulley 11 is rotated in the pull-up direction of the bottom rail 5, the rotational force is transmitted to the rotary drum 81 via the drive gear (not shown), the transmission gear 89, and the drive drum 72.

  Then, the clutch convex portion 84 is guided into the engagement groove 75, the rotary drum 81 moves toward the transmission drum 86, and the drive locking tooth 88 engages with the driven locking tooth 87. Then, the rotation of the drive drum 72 is transmitted to the transmission drum 86 via the rotary drum 81, and the drive shaft 12 is rotated based on the rotation of the transmission drum 86 in the direction of arrow A in FIG. At this time, after the drive locking tooth 88 engages with the driven locking tooth 87, the clutch drum 73 and the stop spring 79 are driven because the engaging portion of the rotary drum 81 abuts against the end 80a of the stop spring 79. It is integrally rotated with the drum 72.

  On the other hand, when the operation pulley 11 is rotated in the pull-down direction of the bottom rail 5, the rotational force in the arrow B direction of FIG. 5 is transmitted to the rotary drum 81, the clutch convex portion 84 moves to the release groove 76, The engagement between the locking tooth 88 and the driven locking tooth 87 is released, and the driving locking tooth 88 idles in the direction of arrow B in FIG. 5, and the rotational force in the direction of arrow B in FIG. It is not transmitted to the drive shaft 12.

  With the above configuration, the transmission clutch 21 transmits to the drive shaft 12 only rotation in one direction applied to the operation pulley 11.

  The drive shaft 12 is inserted into the stopper device 24 at an intermediate portion of the head box 1. When the ball chain 13 is released after the bottom rail 5 is pulled up, the stopper device 24 stops the rotation of the drive shaft 12 to prevent the weight fall of the bottom rail 5.

  Here, the operation of the stopper device 24 will be described with reference to FIGS. 8 to 9.

  As shown in FIG. 8, the stopper device 24 includes a stopper drum 94, a stopper case 95 disposed around the stopper drum 94, and a stopper ball 96 disposed therebetween. The outer peripheral surface of the stopper drum 94 is provided with a stopper guide groove 98 having an outer peripheral surface shape shown in FIG. 9 and having a semicircular cross section. The inner peripheral surface of the stopper case 95 is provided with a slide groove 97 extending in the direction along the drive shaft 12 and having a semicircular cross section. The stopper ball 96 is disposed between the stopper guide groove 98 and the slide groove 97. Therefore, the stopper ball 96 can move only in the direction along the drive shaft 12, and when the stopper drum 94 is rotated, the stopper ball 96 follows the stopper guide groove 98 on the outer peripheral surface of the stopper drum 94. It moves along the slide groove 97 while relatively orbiting.

  The configuration of the stopper guide groove 98 will be described according to the developed view shown in FIG. In FIG. 9, when the stopper drum 94 is rotated in the pulling direction of the bottom rail 5 (in the direction of arrow A in FIG. 1), the stopper ball 96 moves relatively on the stopper guide groove 98 in the direction of arrow C in FIG. .

  Further, when the stopper drum 94 is rotated in the pull-down direction of the screen 4 (the direction of arrow B in FIG. 1), the stopper ball 96 relatively moves on the stopper guide groove 98 in the direction of arrow D.

  A pull-down groove 99 is formed on one side of the outer peripheral surface of the stopper drum 94. A first return groove 50 branched in the arrow C direction communicates with the pull-down groove 99, and the first return groove 50 joins the pull-up groove 51 in the arrow C direction.

  A stop groove 52 branched in the direction of arrow D communicates with the pull-up groove 51. The stop groove 52 is closed at the locking portion 53 in the direction of arrow D and passes through a second return groove 54 extending in the direction of arrow C. It joins with the down groove 99.

  In the stopper device 24 configured as described above, when the drive shaft 12 is rotated in the pulling direction of the screen 4 via the transmission clutch 21 based on the operation of the ball chain 13, the stopper ball 96 runs in the pulling groove 51. Move in the arrow C direction.

  After pulling up the screen 4 to a desired position, releasing the ball chain 13 causes the lifting cord 7 to be unwound by the weight of the screen 4, and the stopper drum 94 is rotated via the drive shaft 12, and the stopper ball 96 is pulled up. The inside of the groove 51 is moved in the direction of arrow D.

  Then, the stopper ball 96 engages with the locking portion 53 and the further rotation of the stopper drum 94 is blocked. Therefore, in this state, the weight drop of the screen 4 is prevented.

  Next, when the screen 4 is lowered, the ball chain 13 is operated to slightly pull up the screen 4, and the stopper ball 96 passes from the locking portion 53 through the second return groove 54 and into the pull-down groove 99. You will be guided.

  Then, the stopper ball 96 can circulate in the draw-down groove 99 in the direction of the arrow D. Therefore, if the ball chain 13 is released, it is possible to lower the screen 4 by its own weight.

  Further, when the screen 4 is further pulled up from the state where the stopper ball 96 is engaged with the locking portion 53, the ball chain 13 is operated in the pull-up direction of the screen 4.

  Then, the stopper ball 96 is guided from the locking portion 53 through the second return groove 54 into the pull-down groove 99 and is further guided through the first return groove 50 into the pull-up groove 51. Therefore, the pulling operation of the screen 4 by the ball chain 13 becomes possible.

  As shown in FIG. 1, the drive shaft 12 is inserted into the governor device 36 on the side of the stopper device 24. The governor device 36 suppresses the rotational speed of the drive shaft 12 to a predetermined value or less without stopping the rotation of the drive shaft 12, and suppresses the descent speed of the bottom rail 5 when falling by its own weight to a predetermined speed or less.

  Here, the operation of this pleated screen will be described. When the inner portion of the ball chain 13 is pulled in the direction of arrow A in FIG. 2, the rotational force generated by the force is transmitted to the transmission clutch 21 via the operation pulley 11. Since the transmission clutch 21 is configured to transmit only the rotational force in the direction of arrow A in FIG. 1 to the drive shaft 12, the rotational force generated by pulling the ball chain 13 in the direction of arrow A in FIG. Is transmitted to the drive shaft 12, and the drive shaft 12 is rotated. By rotation of the drive shaft 12, the winding shaft 10 rotatably supported by the support member 8 in the head box 1 is rotated in the direction of arrow A in FIG. 1, and the lifting cord 7 is spirally wound, The bottom rail 5 attached to the end of the lifting cord 7 is lifted.

  When the hand is released from the ball chain 13 in this state, the stopper device 24 operates to prevent the bottom rail 5 from falling by its own weight. In this state, when the ball chain 13 is pulled again in the direction of arrow A in FIG. 2 and then released, the stopper device 24 releases its own weight lowering prevention operation and the lifting cord 7 is rewound from the winding shaft 10 Bottom rail 5 descends.

  Incidentally, since the transmission clutch 21 does not transmit the rotational force in the direction of arrow B in FIG. 1, even if the room outer side portion of the ball chain 13 is pulled down in the direction of arrow B in FIG. In addition, the ball chain 13 idles. Therefore, even if the outside of the room of the ball chain 13 is pulled down, almost no tension is applied to the ball chain 13.

  Next, a specific configuration of the ball chain 13 will be described according to FIGS. As shown in FIGS. 10A and 10B, in the ball chain 13, balls 16 of synthetic resin are formed at regular intervals on a cord 15 of polyester. Each ball 16 is a solid body formed into a spheroid shape on a surface of a cord 15 by a molding machine, and each ball 16 is fixed immovably to the cord 15. For convenience of illustration, in FIG. 10, the number of balls 16 is smaller than in FIGS.

  The ball chain 13 can be formed by connecting two main cords 13a and 13b by two connecting parts 17a and 17b. Each of the main cords 13 a and 13 b has a large number of balls 16 on the cord 15, and hemispherical portions 16 a are provided at both ends of the cord 15. In the present embodiment, the lengths of the main code 13a and the main code 13b are the same.

  As shown in FIGS. 10 to 11, the connecting portions 17a and 17b have the same configuration, and are connected to the main cords 13a and 13b in a state in which the connecting portions 17a and 17b are turned upside down. The following description will proceed with the connecting portion 17a, but the same description applies to the connecting portion 17b.

  As shown in FIG. 11 to FIG. 12, the connecting portion 17 a is a cylindrical second connecting member (a first connecting portion 43 provided at one end of the two first connecting members 41 a and 41 b). The second fitting portion 42 is connected. The basic configuration of the first connecting members 41a and 41b is the same, but the first connecting member 41a is a movement that slidably accommodates the cylindrical moving member 40 in the round shaft shaped fitting projection 45. It differs from the first connecting member 41 b in that the member accommodating portion 29 is provided. The length in the depth direction of the moving member housing portion 29 is longer than the length in the height direction of the pin-like moving member (moving pin) 40 (for example, 1.5 times or more, preferably 2 times or more). . As shown in FIG. 11A, when the fitting projection 45 of the first connecting member 41a is directed downward, the moving member 40 is moved to the approximate tip of the fitting projection 45, and the connection is made. The part is in a high holding power state. On the other hand, as shown in FIG. 11B, when the fitting projection 45 of the first connection member 41a faces upward, the moving member 40 moves to a position away from the tip of the fitting projection 45. Then, the connection part is in a low holding force state.

  In the first connecting members 41a and 41b, as shown in FIGS. 11 to 12, the hemispherical portion 20 in the shape of a half of the ball 16 is outsert molded on one end of the connecting cord 19 made of the same material as the cord 15 The first fitting portion 43 is formed on the lower end of the first engaging portion 43. A ball 44 having the same shape as the ball 16 is fixed between the hemispherical portion 20 and the first fitting portion 43, and the distance between the first fitting portion 43 and the ball 44 and the distance between the ball 44 and the hemispherical portion 20 Is the same as the distance between the balls 16.

  The hemispherical portion 20 and the first fitting portion 43 are formed on both ends of the connecting cord 19 with the same synthetic resin as the ball 16. The base end of the first fitting portion 43 is formed in a hemispherical shape similar to the end of the ball 16, and the tip of the first fitting portion 43 has a round shaft shaped fitting protrusion 45. It is formed.

  On the outer peripheral surface of the tip of the fitting projection 45, as shown in FIGS. 12 to 15, an expanded diameter portion 46 is formed in line symmetry with respect to the center of the round shaft, and the middle of the expanded diameter portion 46 In each of the grooves, a concave stripe 47 having a semicircular cross section is formed.

  At the base end of the fitting projection 45, as shown in FIGS. 12 and 16, a rotation restricting portion 48 protruding in the radial direction of the round shaft is formed in line symmetry with respect to the center. Further, each rotation restricting portion 48 is formed at a position separated by 45 degrees in the circumferential direction from the concave stripe 47 with respect to the center of the round shaft.

  The second connecting member 42 is formed in a cylindrical shape from the same synthetic resin as the first fitting portion 43 and the balls 16 and 44, and is formed as a second fitting portion having a fitting hole, as shown in FIG. As shown in FIG. 18 and FIG. 18, the openings 49a and 49b on both sides are formed in a wedge shape in which the distal end including the expanded diameter portion 46 of the fitting projection 45 can be inserted. Further, the openings 49a and 49b have shapes in which the direction of the wedge shape is rotated by 90 degrees with respect to the center of the cylinder.

  Inside the second connection member 42, a circular hole 50 having a diameter that allows the tip of the fitting projection 45 to be pivotable is formed. Then, locking portions 51a and 51b are formed on the opening edge of the short axis direction of the wedge portion of the opening 49a so as to prevent the expanded diameter portion 46 of the first connecting member 41a from coming off from the circular hole 50. Locking portions 51c and 51d are formed on the opening edge of the short axis direction of the wedge shape of the portion 49b to prevent the expanded diameter portion 46 of the first connecting member 41b from coming off the circular hole 50.

  Further, on the inner peripheral surface of the circular hole 50, a protrusion 52 engaged with the recess 47 is formed inside the locking portions 51a and 51c. In order to connect the first connection member 41 a and the second connection member 42, the fitting projection 45 of the first fitting portion 43 of the first connection member 41 a is an opening of the second connection member 42. The first fitting portion 43 is rotated by 90 degrees in the clockwise direction with respect to the second connecting member 42. Then, the groove 47 of the fitting projection 45 engages with the ridge 52 in the circular hole 50, and the rotation restricting portion 48 moves from the corner of the wedge shape of the opening 49a to the next corner, It is positioned as shown in FIG.

  Similarly, the fitting projection 45 of the first connecting member 41b is inserted into the other opening 49b of the second connecting member 42 and rotated 90 degrees for positioning. Then, as shown in FIG. 11, the first connection members 41 a and 41 b are connected via the second connection member 42.

  In this state, the expanded diameter portion 46 of the fitting projection 45 of each of the first connection members 41 a and 41 b engages with the locking portions 51 a to 51 d of the second connection member 42, and the second connection member 42 In the circular hole 50 of the Further, the external shape in a state in which the first fitting portion 43 is fitted to both sides of the second connecting member 42 is formed to be the same as the ball 16. The hemispherical portions 20 of the first connection members 41a and 41b are welded and fixed to the hemispherical portions 16a which are outsert molded on both ends of the main cords 13a and 13b, and balls having the same shape as the balls 16 are formed. Then, when the first connecting members 41a and 41b are connected by the second connecting member 42, as shown in FIG. 10 (b), an endless ball chain 13 is formed. In the ball chain 13 configured as described above, balls of the same shape are formed at the same intervals over the entire length of the cord 15 and the connecting cord 19 of the connecting portions 17a and 17b. Accordingly, the ball chain 13 can rotate around the operation pulley 11 without limitation.

  By the way, in FIG. 11 (a), as for the connection part 17a, the fitting protrusion 45 of the 1st connection member 41a has faced the downward side, and the moving member 40 is arrange | positioned in the approximate tip of the fitting protrusion 45. Therefore, in FIG. 11B, in the connecting portion 17b, the fitting projection 45 of the first connecting member 41a is facing upward, and the moving member 40 is in the fitting projection 45. Since it is disposed at a position away from the tip, it has a low holding force. On the other hand, as shown in FIGS. 23 (a) and 23 (b), the fitting projection 45 of the first connecting member 41a of the connecting portion 17a faces the upper side, and the fitting of the first connecting member 41a of the connecting portion 17b. In the state where the projection 45 faces downward, the connecting portion 17a is in the low holding force state, and the connecting portion 17b is in the high holding force state. As described above, which of the high holding force state and the low holding force state the connecting portions 17a and 17b are to be in is determined by the direction in which the fitting projection 45 of the first connecting member 41a faces. In other words, the connecting portions 17 a and 17 b are configured such that the holding force changes as the moving member 40 moves at the position where the ball chain 13 is turned. The connecting portions 17a and 17b are spaced apart in the ball chain 13 such that when one is in a high holding force state, the other is in a low holding force state (for approximately dividing the ball chain 13 in the circumferential direction) It is done. The connecting portions 17a and 17b are directed in the same direction with respect to the circumferential direction of the ball chain 13, which is indicated by the arrow C in FIG. 10 (b). That is, the fitting protrusion 45 is directed in the direction of the arrow C in both of the connecting portions 17a and 17b. Since the connecting parts 17a and 17b are oriented in this way, one of the connecting parts 17a and 17b is located inside the room and the other is located outside the room, one of which is in a high holding power state and the other is low. It becomes a holding power state.

  The holding force when the connecting portions 17a and 17b are in the high holding force state is the second connecting member 42 in the fitting projection 45 under the normal tensile force acting on the ball chain 13 at the time of normal elevating operation of the solar radiation shielding material. It is set so as not to get out of it. Then, only when a large tensile force exceeding a normal tensile force is applied to the ball chain 13, the elasticity of the synthetic resin of the second connection member 42 causes the expanded diameter portion 46 of the fitting projection 45 to perform a second connection. The openings 49 a and 49 b of the member 42 are pushed apart and the fitting projection 45 is disengaged from the second connecting member 42. Thus, the connecting portion 17a in the high holding force state is separated only when a large force is applied to some extent.

  On the other hand, the holding force when the connecting portions 17a and 17b are in the low holding force state is smaller than the holding force in the high holding force state, and even when a small force is applied as in the case of a light force. It is designed to be easily separated. The presence of the connection portion 17b in such a low holding force state ensures that the looped ball chain 13 is always separated when it is stuck with a light force, thereby enhancing the safety.

Here, the operation and effect of the present embodiment will be described with reference to FIG.
In the state of FIG. 2, the connecting portion 17a and the connecting portion 17b are respectively located inside and outside the room of the ball chain 13, the connecting portion 17a is in a high holding force state, and the connecting portion 17b is low. It is in a holding state. When raising the bottom rail 5, the room inner portion of the ball chain 13 is pulled down in the direction of the arrow A. At this time, although a relatively strong separation force is applied to the connecting portion 17a, since the connecting portion 17a is in a high holding force state, the ball chain 13 is not separated at the connecting portion 17a. Further, even if the inner portion of the ball chain 13 is pulled down, no force is applied to the connecting portion 17b located on the outer side of the chamber of the ball chain 13, so the connecting portion 17b in the low holding force state is not separated. On the other hand, in this state, when the ball chain 13 is caught by a light force, the connection portion 17b in the low holding force state is separated, and the occurrence of an accident is prevented.

  When the ball chain 13 is pulled down in the direction of arrow A in FIG. 2 and the ball chain 13 is rotated by a half turn, the positions of the connecting portion 17a and the connecting portion 17b become opposite as shown in FIG. In this state, the connecting portion 17b is in a high holding force state, and the connecting portion 17a is in a low holding force state. When the inner portion of the ball chain 13 is pulled down in the direction of arrow A in FIG. 24, a relatively strong separation force is applied to the connecting portion 17b, but the connecting portion 17b is in a high holding force state. The ball chain 13 is never separated. Further, in this state, when the ball chain 13 is caught by a light force, the connection portion 17a in the low holding force state is separated, and the occurrence of an accident is prevented.

  When the bottom rail 5 is lowered from the state shown in FIG. 24, the self weight drop preventing operation of the stopper device 24 is released by pulling down the inner portion of the chamber of the ball chain 13 in the direction of arrow A. The weight of the ball chain 5 is lowered by releasing the hand. Thus, when lowering the bottom rail 5, a force is applied only to the connecting portion 17b in the high holding force state, and no force is applied to the connecting portion 17a in the low holding force state. The connecting part 17a which is in the state does not come off unintentionally.

  The following can be said from the above contents. The maximum tension exerted on one of the two parts of the ball chain 13 depending from the operation pulley 11 is greater than the maximum tension exerted on the other. The portion with the largest maximum tension is the high tension portion, and the portion with the largest maximum tension is the low tension portion. In the present embodiment, since the bottom rail 5 is moved up and down using only the chamber inner portion of the ball chain 13, tension is applied only to the chamber inner portion of the ball chain 13. Therefore, the chamber inner portion of the ball chain 13 is a high tension portion, and the chamber outer portion of the ball chain 13 is a low tension portion. The holding force of the connection portions 17a and 17b in the high holding force state is larger than the maximum tension applied to the high tension portion, and the holding force of the connection portions 17a and 17b in the low holding force state is the maximum applied to the low tension portion Make it larger than tension. And when connection part 17a, 17b is located in a high tension part, connection part 17a, 17b will be in a high holding force state, and connection part 17a, 17b may be connected part 17a, when it is located in a low tension part. By configuring the connecting portion so that 17b is in a low holding force state, the connecting portion of the ball chain 13 is not separated by the operation force at the time of moving the bottom rail 5 up and down, and the ball chain 13 is caught by light force. In this case, the connection portion of the ball chain 13 is easily separated, which enhances the safety.

  In addition, when it represents using the torque added to the operation pulley 11, it is as follows. The maximum torque required to rotate the operation pulley 11 in one direction is larger than the maximum torque required to rotate in the other direction. The rotation direction in which the maximum torque is larger is referred to as the high torque rotation direction, and the rotation direction in which the maximum torque is smaller is referred to as the low torque rotation direction. In the present embodiment, the rotational direction of the operation pulley 11 is the high torque rotational direction and the opposite direction is the low torque rotational direction when the bottom rail 5 is raised by pulling down the chamber inner portion of the ball chain 13. The holding force of the connection portions 17a and 17b in the high holding force state applies a tension corresponding to this holding force to the ball chain 13 to rotate the operation pulley 11 in the high torque rotation direction, and the torque is high torque rotation direction Set to be larger than the maximum torque. On the other hand, the holding force of the connection portions 17a and 17b in the low holding force state is such that the torque at the time of rotating the operation pulley 11 in the low torque rotation direction is low by applying tension corresponding to this holding force to the ball chain 13. Set to be larger than the maximum torque in the direction. By setting the holding force of the connecting portions 17a and 17b in this manner, it is possible to prevent the connecting portions 17a and 17b from being unintentionally separated at the time of operation.

The present invention can also be practiced in the following embodiments.
In addition to the pleated screen, the present invention is also applicable to various solar radiation shielding devices (e.g., horizontal blinds, raised curtains, roll screens) that raise and lower the solar radiation shielding material using the operation cord. The present invention is also applicable to other shielding devices (eg, curtain rails, accordion curtains, vertical pleated screens, vertical roll screens, panel curtains, etc.) that open and close the shielding material using the operation cord.
In the above embodiment, the fitting projections 45 of the first connecting members 41a and 41b are inserted into the fitting holes of the second connecting member 42, and the two are fitted to each other by relatively rotating them. However, the fitting projections 45 of the first connecting members 41a and 41b may be elastically fitted in the fitting holes of the second connecting member 42 (that is, a strong force is applied and pushed in).
In the above embodiment, the bottom rail 5 is raised by pulling down the chamber inner portion of the ball chain 13, but the bottom rail 5 may be raised by pulling down the chamber outer portion of the ball chain 13. In that case, the room outer side portion of the ball chain 13 is a high tension portion, and the room inner portion is a low tension portion. Therefore, the ball chain 13 is brought into a high holding force state when the connecting portions 17a and 17b are located in the room outer portion of the ball chain 13 and a low holding force state when located in the room inner portion. Can be secured to the operation pulley 11 while the connection of the ball chain 13 is prevented from being separated at the time of operation, and safety can be enhanced.
The one-way clutch is, in addition to the above clutch type, a ratchet type in which the input side always engages the output side rotary member only in one rotation direction to transmit torque, or a needle type (inner ring circumferential surface Another method may be used such as moving the needle provided on the cam surface of the outer ring between the meshing position and the non-meshing position in the rotational direction with respect to the cam surface of the outer ring.

2. Second Embodiment In the first embodiment, the connecting portions 17a and 17b have a three-member configuration including the first connecting members 41a and 41b and the second connecting member 42. However, in the present embodiment, the connecting portions 17a and 17b are provided. As shown in FIG. 25, 17b has a two-member configuration including a first connecting member 41a and a second connecting member 41c. The second connecting member 41c has a configuration similar to the first connecting member 41b of the first embodiment, and the fitting portion 46 is a fitting of the first connecting member 41b of the first embodiment. It has the structure which united the part 43 and the 2nd connection member 42. As shown in FIG. Therefore, the fitting structure of the first connecting member 41 a and the second connecting member 41 c of the present embodiment is the same as the fitting structure of the first connecting member 41 a and the second connecting member 42 of the first embodiment. is there.

  Even in the configuration of the present embodiment, the direction of the fitting projections 45 of the first connecting member 41a determines whether the connecting portions 17a and 17b are in the high holding state or the low holding state. . Therefore, also in the present embodiment, as in the first embodiment, the safety is enhanced by the low holding force state of either of the connecting portions 17a and 17b.

3. Third Embodiment As shown in FIGS. 26 to 27, in the present embodiment, the operation code is not a ball chain but an endless operation code 14 not having a ball.

  As shown in FIGS. 26 to 27, the operation code 14 can be formed by connecting two main cords 14a and 14b with two connecting parts 17a and 17b. The main cords 14a and 14b are obtained by coating a core 86a made of polyester, nylon or the like with an outer cord 86b knitted with polyester, and the core 86a ensures the linearity of the operation cord 14 Durability in the stretch direction is secured. At both ends of the main cords 14a and 14b, the core 86a is removed to form a cord insertion portion 86c.

  The connecting portions 17a and 17b are, as in the first embodiment, a cylindrical second connecting member (a first connecting portion 43 provided at one end of the two first connecting members 41a and 41b). The second fitting portion 42 is connected. The first connection members 41 a and 41 b each include a connection cord 61. Then, in a state where the connection cord 61 is inserted into the cord insertion portion 86c, the both are fixed by a method such as sewing or welding, whereby the endless operation cord 14 is formed.

  Even in the configuration of the present embodiment, the direction of the fitting projections 45 of the first connecting member 41a determines whether the connecting portions 17a and 17b are in the high holding state or the low holding state. . Therefore, also in the present embodiment, as in the first embodiment, the safety is enhanced by the low holding force state of either of the connecting portions 17a and 17b.

The above embodiment may be implemented in the following manner.
The fitting structure of the connecting portions 17a and 17b is not particularly limited, and may be a three-member configuration as in the first embodiment or a two-member configuration as in the second embodiment.
The external shape of the connecting portions 17a and 17b may not be ball-shaped.
The main cords 14a and 14b may be in the form of a string thinner than that shown in FIG.
The main cords 14a and 14b and the connection parts 17a and 17b may be connected by a method other than the above.

4. Fourth Embodiment As shown in FIGS. 28-29, this embodiment is similar to the first embodiment, but in the present embodiment, the connecting portions 17a and 17b can be attached to and detached from the main cords 13a and 13b. By being connected, endless ball chain 13 is formed.

  Balls 16b are provided at both ends of the main cords 13a and 13b. The connecting portions 17a and 17b are, as in the first embodiment, a cylindrical second connecting member (a first connecting portion 43 provided at one end of the two first connecting members 41a and 41b). The second fitting portion 42 is connected. The first connecting members 41a and 41b are each formed of a synthetic resin in a substantially rectangular parallelepiped shape, and provided on the upper surface thereof with a locking hole 82 opened in an oval shape so as to allow insertion of the ball 16b. There is. At the center of the base end surface of the first connecting members 41a and 41b, as shown in FIG. 29, an insertion hole 83 connected to the locking hole 82 is opened, and the insertion hole 83 is a first connection via the guide groove 84. It is open at the top of the member 41. Then, the ball 16b formed at the end of the main cords 13a and 13b is inserted into the locking hole 82, and the cord 15a connected to the ball 16b is inserted from the guide groove 84 into the insertion hole 83, the ball 16b is engaged It is held in the stop hole 82.

  Even in the configuration of the present embodiment, the direction of the fitting projections 45 of the first connecting member 41a determines whether the connecting portions 17a and 17b are in the high holding state or the low holding state. . Therefore, also in the present embodiment, as in the first embodiment, the safety is enhanced by the low holding force state of either of the connecting portions 17a and 17b.

The above embodiment may be implemented in the following manner.
The present embodiment is also applicable to operation codes other than the ball chain 13. In that case, instead of providing the balls 16b at the both ends of the main cord, a stopper of another shape may be provided. And the locking hole 82 should just be made into the shape which can lock the locking body.
The fitting structure of the connecting portions 17a and 17b is not particularly limited, and may be a three-member configuration as in the first embodiment or a two-member configuration as in the second embodiment.

5. Fifth Embodiment As described in the first embodiment, in the state of FIG. 2, the connecting portion 17 a is in the high holding force state, and the connecting portion 17 b is in the low holding force state. In this state, when the inner portion of the chamber of the ball chain 13 is pulled down in the direction of arrow A in FIG. 2, at a certain point, the connection portion 17b in the low holding force engages with the operation pulley 11 as shown in FIG. It will be in a state of In this state, even when the ball chain 13 is caught by light force, the connection pulley 17 may not be properly separated because the operation pulley 11 interferes. Therefore, in the present embodiment, as shown in FIG. 30B, the ball chain 13 is provided with three connecting portions 17a, 17b and 17c, and these three connecting portions 17a, 17b and 17c are the two closest to each other. The distance between the coupling portions is arranged to be more than half of the outer circumference of the operation pulley 11. By arranging the three coupling portions 17a, 17b and 17c in this manner, as shown in FIG. 30 (c), even if one coupling portion is engaged with the operation pulley 11, another coupling portion is Since the low holding force state is achieved, when the ball chain 13 is caught by light force, it is separated securely and security is enhanced.

  Further, as a modification, as shown in FIG. 31 (a), the ball chain 13 may be provided with four connecting portions 17a, 17b, 17c, 17d. Also in this case, the four coupling portions may be arranged such that the distance between the two closest coupling portions is greater than half of the outer circumference of the operation pulley 11.

  If the above contents are generalized, by providing n (n is 3 or more) connecting portions in the operation cord such that the distance between the two closest connecting portions is greater than half of the outer circumference of the operation pulley 11 Even when one connecting part is engaged with the operating pulley, the other connecting part is in a low holding force state, so that it is securely separated when it is caught on the operating cord with a light force, and the safety is enhanced. Be Preferably, the n connecting portions are directed in the same direction with respect to the circumferential direction of the operation code. Further, it is preferable that n connecting parts be provided so as to divide the operation code into n in the circumferential direction.

6. Sixth Embodiment In the first embodiment, the bottom rail 5 is raised by pulling down the chamber inner portion of the ball chain 13 to arrow A in FIG. 2, and the chamber inner portion of the ball chain 13 is in the direction of arrow A in FIG. As the bottom rail 5 is lowered by its own weight by releasing the stopper device 24 from its own weight lowering prevention operation, the outside portion of the room of the ball chain 13 is not used.

  On the other hand, in the present embodiment, as in Japanese Patent No. 3378813, the stopper device for preventing the lowering of the weight of the bottom rail 5 is provided closer to the operation pulley 11 than the transmission clutch 21. By disconnecting the release clutch of the transmission clutch 21 by this, the connection between the operation pulley 11 and the drive shaft 12 is released. Therefore, in the present embodiment, the chamber inner portion of the ball chain 13 is pulled down to raise the bottom rail 5, and the chamber outer portion of the ball chain 13 is pulled down to lower the bottom rail 5. The tension applied to the ball chain 13 at the time of disengagement of the release clutch is smaller than the tension applied to the ball chain 13 at the time of pulling up the bottom rail 5, so the room inner portion of the ball chain 13 is high as in the first embodiment. It becomes a tension part, and the room outer side part of the ball chain 13 becomes a low tension part. Therefore, also in the present embodiment, the safety can be enhanced while preventing the connecting portion of the ball chain 13 from being separated at the time of operation according to the same principle as the first embodiment.

The above embodiment may be implemented in the following manner.
The bottom rail 5 may be lowered synchronously with the pull-down operation by pulling down the room outer portion of the ball chain 13 in the direction of the arrow B in FIG. Usually, since the tension applied to the ball chain 13 when lowering the bottom rail 5 is smaller than the tension applied to the ball chain 13 when pulling up the bottom rail 5, the inner side of the ball chain 13 is the same as the above embodiment. The part becomes a high tension part, and the room outer part of the ball chain 13 becomes a low tension part. Therefore, also in such an embodiment, safety can be enhanced while preventing the connecting portion of the ball chain 13 from being separated at the time of operation by the same principle as the first embodiment.

7. Seventh Embodiment In the first and sixth embodiments, of the two portions of the operation cord suspended from the operation pulley, the portion (raising operation portion) for rotating the operation pulley in the direction of raising the solar radiation shielding material has high tension. Although it was a part, in a spring type roll screen etc., the tension applied to the operation cord when raising the solar radiation shielding material may be smaller than the tension applied to the operation cord when lowering the solar radiation shielding material . In such a case, of the two portions of the operation cord suspended from the operation pulley, the portion (falling operation portion) for rotating the operation pulley in the direction of lowering the solar radiation shielding material is the high tension portion. Even in such a case, safety can be enhanced while preventing the connecting portion of the ball chain 13 from being separated at the time of operation by the same principle as that of the first embodiment.

8. Eighth Embodiment The eighth embodiment of the present invention will be described with reference to FIG. The present embodiment is similar to the first embodiment, and the main difference is that the fitting protrusion 45 of the first connecting member 41a is provided with a slit-like air vent 29a. The differences will be mainly described below.

  In the first embodiment, the cylindrical movable member 40 is accommodated in the movable member accommodating portion 29 provided in the round shaft shaped fitting projection 45 of the first connecting member 41 a, and in the movable member accommodating portion 29. The holding force of the connecting portion is changed by moving the moving member 40, but the opening diameter of the moving member housing portion 29 and the outer diameter of the moving member 40 are substantially the same or the difference is very small. As shown in FIG. 23 (a), since the inside of the moving member accommodating portion 29 is substantially a sealed space, as shown in FIG. 23 (b), the moving member 40 is substantially at the tip of the fitting projection 45. When the moving member 40 moves to a position away from the tip of the fitting projection 45, there is a problem that the air in the moving member housing portion 29 interferes with the movement of the moving member 40 in some cases. .

  In the present embodiment, as shown in FIG. 33, the movable member accommodating portion 29 is moved when the moving member 40 is moved by providing the fitting protrusion 45 with a slit-like air vent 29a communicating with the movable member accommodating portion 29. The air inside is easily released, and the moving member 40 can move smoothly. The shape of the air vent 29a is not particularly limited, and may be, for example, a through hole communicating with the moving member housing 29. When the air venting portion 29a is in the form of a slit, the friction between the moving member 40 and the inner surface of the moving member housing portion 29 is reduced, and the moving member 40 can be more easily moved.

  Further, a member surrounding the fitting protrusion 45 (eg, the second connecting member 42 in the first embodiment, the second connecting member in the second embodiment) so that the air in the moving member housing portion 29 is more easily released. 41c) may also be provided with an air vent.

9. Ninth Embodiment A ninth embodiment of the present invention will be described with reference to FIG. The present embodiment is similar to the first embodiment, and the main difference is that the movement of the movable member 40 is promoted by the movement promoting member (in the present embodiment, a magnet). The differences will be mainly described below.

  It is necessary to change the connecting portion in the operation pulley to the strong state at the earliest possible stage.

  In this embodiment, as shown in FIG. 34, the moving member 40 is formed of a magnetic body (a material that adheres to a magnet), and a magnet is provided adjacent to each engagement recess 11a of the operation pulley 11 on which the ball chain 13 is hung. 11b is provided. As shown in FIG. 34 (a), when the connecting portion 17a is engaged with the engagement recess 11a, a direction toward the tip of the fitting projection 45 is obtained by the attractive force between the moving member 40 and the magnet 11b (FIG. 34). The force in the direction of arrow A in (a) is applied to the moving member 40. The movement of the moving member 40 is impeded by its own weight and a resistance such as a frictional force between the moving member 40 and the inner surface of the moving member housing 29. However, as the position of the connecting portion 17a approaches the highest point of the operation pulley 11, the resistance due to the weight of the moving member 40 decreases, and when the position of the connecting portion 17a exceeds the highest point of the operation pulley 11, the moving member 40 moves. Movement is facilitated by its own weight and gravity. Therefore, as shown in FIG. 34 (b), the moving member 40 is attached to the tip of the fitting projection 45 at a certain point while the connecting portion 17 a is engaged with the operation pulley 11 and pivots around the operation pulley 11. Moving toward it, the connecting portion 17a changes from the low holding force state to the high holding force state. The moving member 40 moves at any timing before reaching the highest point, reaching the highest point, or after reaching the highest point. After reaching the highest point, the moving member 40 moves in the traveling direction of the connecting portion 17a by a force obtained by combining the gravity and the attractive force. As described above, in the present embodiment, since the magnetic force is applied to the moving member 40 to promote the movement of the moving member 40, the mode can be switched at an early stage.

  Here, although the attraction force by the magnet is exerted on the moving member 40 to promote the movement of the moving member 40, the moving member 40 is made of a magnet and it is between the magnet provided on the operation pulley 11 and the moving member 40. Repulsion may be generated to facilitate movement of the moving member 40 by this repulsion. Furthermore, attraction and repulsion by magnets may be used in combination.

  Also, instead of providing the operation pulley 11 with a magnet, a magnetic force may be applied to the moving member 40 by a magnet provided at another position. For example, as shown in FIG. 35, the weight 65 having the lower pulley 64 may be disposed at the lower end of the loop of the ball chain 13, and the magnet 64b may be provided adjacent to the engagement recess 64a of the lower pulley 64. In this case, the connecting portion 17a changes from the high holding force state shown in FIG. 35 (a) to the low holding force state shown in FIG. 35 (b).

10. Tenth Embodiment A tenth embodiment of the present invention will be described with reference to FIGS. In the embodiments so far, the holding force of the connecting portion is switched by moving the moving member 40 in the moving member housing portion 29 provided in the fitting projection 45, but in the present embodiment According to the above configuration, switching of the holding power of the connecting portion is performed. Specifically, in the present embodiment, the engagement portion of the connection portion is configured to be released from the engagement by being spread outward in the radial direction of the operation cord 14, and the moving member 40 has an outer periphery of the engagement portion. From the side, the holding force of the connecting portion is changed by restricting / non-regulating the deformation in the direction in which the engaging portion spreads. Hereinafter, the configurations of the connecting portion and the moving member will be described in detail.

  In the present embodiment, as shown in FIGS. 36 to 37, the connecting portion 17a is configured by complementary key-shaped portions 14c and 14d provided at both ends of the operation code 14, and the holding power switching unit 100. .

  The key-shaped parts 14c and 14d are formed by melting the end of the operation cord 14 by applying heat or ultrasonic vibration in a state where the end of the operation cord 14 is sandwiched between the split molds having a predetermined cavity shape. can do.

  As shown in FIG. 36 (b), the holding power switching unit 100 welds the wedge-shaped members 90 and 91 in a state in which the cylindrical moving member 40 is accommodated in the pair of wedge-shaped members 90 and 91. It can be formed. A movable member 40 is slidably disposed in the movable member housing portion 29 in the holding force switching unit 100. The frame-like members 90, 91 and the moving member 40 are provided with openings 90a, 91a, 40a which are substantially the same as or slightly larger than the diameter of the operation cord 14, respectively. Are arranged in a line in the holding power switching unit 100, and the operation cord 14 can be inserted through these openings.

  The method of attaching the holding force switching unit 100 to the operation code 14 is as follows. First, one end of the operation cord 14 is inserted through the openings 90a, 91a and 40a, and in this state, the key-shaped portions 14c and 14d at both ends of the operation cord 14 are engaged. Next, as shown in FIG. 37 (a), the engaging portion 14h of the key-shaped portions 14c and 14d is drawn into the moving member accommodating portion 29, and the engaging portion 14h is from the longitudinal center of the moving member accommodating portion 29. The holding force switching unit 100 is fixed to the operation code 14 by using the fixing member 69 in a state where the holding force is shifted.

  As shown in FIG. 37A, in the state where the engaging portion 14h is surrounded by the moving member 40, the key-shaped portions 14c and 14d are not easily separated even if a tensile force is applied to the operation cord 14. Therefore, in the state of FIG. 37A, the connecting portion 17a is in the high holding force state.

  On the other hand, when the direction of the connecting portion 17a is reversed in response to the operation of the operation code 14, the moving member 40 slides in the moving member housing portion 29, and the state shown in FIG. 37 (b) is obtained. In this state, since the engaging portion 14 h is not surrounded by the moving member 40, the key-shaped portions 14 c and 14 d are relatively easily separated when a tensile force is applied to the operation cord 14. Therefore, in the state of FIG. 37 (b), the connecting portion 17a is in the low holding force state.

11. Eleventh Embodiment An eleventh embodiment of the present invention will be described with reference to FIGS. In the present embodiment, switching of the holding force of the connecting portion is performed by another configuration. Also in the present embodiment, as in the tenth embodiment, the moving member 40 changes the holding force of the connecting portion by restricting / non-regulating the deformation in the direction in which the engaging portion spreads from the outer peripheral side of the engaging portion. Configured as. Hereinafter, the configurations of the connecting portion and the moving member will be described in detail.

  In the present embodiment, an enlarged diameter portion 14 g is provided at one end of the ball chain 13. The expanded diameter portion 14g can be formed by the same method as the key-shaped portions 14c and 14d. At the other end of the ball chain 13, an engagement arm 63 engageable with the enlarged diameter portion 14g is formed. The engagement arm 63 can be formed by outsert molding or the like. The outer shape of the engagement arm 63 is substantially the same as the ball 16.

  The cord 15 adjacent to the enlarged diameter portion 14g has a hook-like moving member 40 which can surround the enlarged diameter portion 14g and the engaging portion 14h of the engaging arm 63 and can slide relative to the cord 15. Provided.

  As shown in FIG. 38A, in a state where the engaging portion 14h is surrounded by the moving member 40, the expanded diameter portion 14g and the engaging arm 63 are not easily separated even if a tensile force is applied to the ball chain 13. Therefore, in the state of FIG. 38 (a), the connecting portion 17a is in the high holding force state.

  On the other hand, when the direction of the connecting portion 17a is reversed in response to the operation of the ball chain 13, the moving member 40 slides along the small diameter portion 14e to be in the state shown in FIG. 38 (b). In this state, since the engaging portion 14 h is not surrounded by the moving member 40, the expanding diameter portion 14 g and the engaging arm 63 are relatively easily separated when a tensile force is applied to the ball chain 13. Therefore, in the state of FIG. 38 (b), the connecting portion 17 a is in the low holding force state.

The moving member 40 may be moved only by its own weight, or the movement promoting member may promote movement of the moving member 40. The movement promoting member may be a magnet as described in the ninth embodiment, or may be a mechanical means as described below.
FIG. 39 shows an example in which the mode switching pulley 66 is provided adjacent to the operation pulley 11. The mode switching pulley 66 includes a rotary plate 66 a and a projection 66 b provided so as to protrude from the main surface of the rotary plate 66 a. In the present embodiment, the plurality of protrusions 66 b are provided at equal intervals in the circumferential direction. The rotating plate 66 a is configured to rotate at a higher speed than the operation pulley 11 in conjunction with the rotation of the operation pulley 11.

  The operation pulley 11 is provided with an engagement recess 11a that engages with the ball 16 or the engagement arm 63, and a pocket 11c provided adjacent to the engagement recess 11a to avoid interference with the moving member 40. There is. The plurality of engagement recesses 11 a and the pockets 11 c are provided on the outer periphery of the operation pulley 11 at equal intervals in the circumferential direction so as to match the pitch of the balls 13 of the ball chain 13.

  As shown in FIG. 39 (a), when the engagement arm 63 is engaged with the engagement recess 11a and orbits around the operation pulley 11, the mode switching pulley 66 rotates at a higher speed, and the projection 66b thereof By pushing up the moving member 40 from the lower side, as shown in FIG. 39 (b), the moving member 40 is quickly moved to a position adjacent to the engagement arm 63. As a result, the connecting portion 17a is rapidly switched from the low holding force state to the high holding force state.

  FIG. 40 shows an example of mode switching using the lower pulley 64 disposed at the lower end of the loop of the ball chain 13. The lower pulley 64 is provided with an engagement recess 64a that engages with the ball 16 or the engagement arm 63, and a pocket 64c provided adjacent to the engagement recess 64a to avoid interference with the moving member 40. There is. A tapered surface 64d is provided between the engagement recess 64a and the pocket 64c.

  The tapered surface 64d abuts on the tapered surface 40d of the moving member 40 when the engaging arm 63 is engaged with the engaging recess 64a, and is formed at a position to push the moving member 40 upward. According to such a configuration, when the engaging arm 63 is engaged with the engaging recess 64a, the moving member 40 is forcibly pulled away from the engaging arm 63, so that the connecting portion 17a is lowered from the high holding force state Switch to holding state securely. In order to lengthen the range in which the tapered surface 64d and the tapered surface 40d can abut, the inclination of the tapered surface 64d is made gentler than that of the tapered surface 40d.

1: Head box 4: Screen 5: Bottom rail 7: Lifting cord 8: Support member 10: Winding shaft 11: Operation pulley 12: Drive shaft 13: Ball chain 14: Operation code 21: Transmission clutch 24: Stopper device 36: Governor device 39: pitch holding cord 40: moving member

Claims (10)

An operating cord which is mounted on an operating pulley and used to rotate the operating pulley to open and close a shielding member,
The operation code includes at least two coupling portions that are separated when a separating force having a magnitude exceeding the holding force is applied,
The connecting portion is configured to change the holding force depending on the direction in which the connecting portion is directed,
When at least one of the connecting portions is in a high holding force state, at least one of the connecting portions is in a low holding force state when the connecting portion is hung on the operation pulley. To be placed, operation code. The operation cord includes n (n is 3 or more) coupling portions, and the n coupling portions are arranged such that the distance between the two closest coupling portions is greater than half of the outer circumference of the operation pulley. The operation code according to claim 1, which is arranged in The said connection part is provided with the movable member which can move with the change of the direction to which the said connection part is directed, and it is comprised so that holding power may change with the movement of the said movement member. The operation code described in 2. The engagement portion of the connection portion is configured to be disengaged by spreading outward in the radial direction of the operation cord, and the movement member is configured such that the engagement portion is from the outer peripheral side of the engagement portion. The operation code according to claim 3, configured to change the holding force of the connecting portion by regulating / non-regulating the deformation in the spreading direction. A shielding device for rotating the operating pulley to open and close a shielding member by operating the operating cord hooked on the operating pulley,
The shielding device according to any one of claims 1 to 4, wherein the operation code is the operation code according to any one of claims 1 to 4. The maximum tension applied to one of the two portions of the operation cord suspended from the operation pulley is larger than the maximum tension applied to the other, and the portion with the largest maximum tension is the high tension portion, the maximum tension The portion with the smaller
The connection portion is configured to be in a high holding force state when positioned at the high tension portion and a low holding force state when positioned at the low tension portion. Shielding device as described. The holding force of the connection in the high holding state is greater than the maximum tension applied to the high tension portion, and the holding force of the connection in the low holding state is greater than the maximum tension applied to the low tension portion. The shielding device according to claim 6, which is large. The shield according to any one of claims 5 to 7, further comprising a one-way clutch that does not transmit the rotation of the operation pulley in the direction of lowering the shield to the drive shaft for opening and closing the shield. apparatus. The connecting portion includes a movable member movable with a change in the direction in which the connecting portion is directed, and is configured such that the holding force changes with the movement of the movable member, and the movement of the movable member moves 9. A shielding device as claimed in any one of claims 5 to 8, configured to be promoted by a facilitating member. A shielding device for rotating the operating pulley to open and close a shielding member by operating an operating cord hooked on the operating pulley,
The operation code includes a connection portion that is separated when a separating force having a magnitude exceeding the holding force is applied,
The connecting portion is configured to change the holding force as the moving member moves at a position where the operation code is turned.
A shielding device configured to facilitate movement of the moving member by a movement facilitating member.