JP4861786B2 - shutter - Google Patents

Description

  The present invention relates to a shutter provided with a sudden descent stop device capable of stopping a shutter curtain even when an unexpected situation such as breakage or disconnection of a drive chain occurs.

  Shutters are widely used to open and close openings such as buildings. The shutter includes a shutter curtain that opens and closes an opening, a winding shaft that winds and lowers the shutter curtain, and guide rails that support both sides of the shutter curtain so as to be movable up and down. The shutter curtain is moved up and down by rotating the winding shaft with an electric motor, a spring, human power, or the like.

  When the winding shaft is rotated by an electric motor, the shutter is provided with an opening / closing device including an electric motor, a brake device, and a governor device. The opening / closing machine and the winding shaft are connected via a sprocket and a chain. Normally, when the up or down button is pressed, the brake is released and the electric motor is driven to raise and lower the shutter curtain. When the stop button is pressed, the power to the switch is cut off, the electric motor stops, the brake device operates and the shutter curtain stops. Therefore, at the time of a power failure, the shutter curtain does not descend because the brake is not released. Further, when the brake device fails, the shutter curtain descends by its own weight while the descending speed is reduced by the governor device.

  In addition, the shutter has a function of automatically releasing the brake with a disaster prevention signal in order to prevent the spread of fire in the event of a fire, and lowering the shutter curtain by its own weight while reducing the descending speed with the governor device. Thus, the shutter is designed to be safe against a sudden drop of the shutter curtain.

  However, the safety measures described above have a problem in that the sudden descent of the shutter curtain cannot be stopped when the chain is cut or disconnected, the shaft neck is disconnected, the sprocket is disconnected, or the like.

For this reason, Patent Document 1 includes a rotating disk 102 coupled to a winding shaft 101 as shown in FIG. 9A and a fixed main body 103 that accommodates the rotating disk 102. A plurality of storage grooves 105, 105,... That store the actual rolling bodies 104, 104,... Are provided, and the upper part of the inner periphery of the fixed body 103 jumps out of the storage grooves by the centrifugal force of high-speed rotation when the shutter curtain is dropped. There is disclosed a shutter provided with a fall prevention device 100 provided with a fitting groove 106 for fitting the rolling element 104 to approximately half the outer diameter to stop the rotation of the rotary disk 102. An arrow A indicates the rotation direction of the winding shaft 101 and the rotating disk 102 when the shutter curtain is dropped. According to this technique, it is said that the shutter curtain can be reliably prevented from falling.
JP 2006-70628 A

  However, in the shutter described in Patent Document 1, as shown in the enlarged view around the fitting groove 106 in FIG. 9B, the center of the rolling body 104 is the edge 105 a of the storage groove 105 of the rotating disk 102 and the fixed main body 103. In the vicinity of the straight line connecting the edge 106a of the fitting groove 106, an incomplete lock may occur in which the rolling body 104 is sandwiched between the two edges 105a and 106a. In this case, the rotating disk 104 slightly reversely rotates due to the recoil of the lock, so that the rolling body 104 falls into the storage groove 105 to release the lock, and the descent of the shutter curtain may resume. In this case, since the next rolling element 104 is locked, there is a problem that the distance until the shutter curtain is stopped becomes long.

Further, due to component tolerances, the number of rotations (hereinafter referred to as “the rotation speed at which the winding shaft 101 is locked by the shutter”).
Sometimes referred to as “lock rotation speed”. ) Was uneven. Therefore, there is a problem that it is necessary to secure the strength of a part that can withstand an impact load generated at the upper limit rotation number at which the lock is generated, and the product price is increased.

  Therefore, the present invention provides a shutter provided with a sudden descent stop device that can reliably stop the shutter curtain when the shutter curtain suddenly descends, and reduce variations in the number of rotations at which the winding shaft is locked. Let it be an issue.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appropriately added in parentheses, but the present invention is not limited to the illustrated embodiment.

  According to the first aspect of the present invention, the take-up shaft (4) for winding and lowering the shutter curtain (2) is provided with a sudden descent stop device (30), and the sudden descent stop device is connected to the take-up shaft. A rolling body (34, 34,...) Housed in a plurality of housing grooves (33, 33,...) Provided on the outer periphery of the rotating disk, and a housing portion (36) for housing the rotating disk and the rolling body. And a fitting groove (37) for stopping the rotation of the rotating disk by fitting the rolling element that has jumped out of the storage groove by the rotation of the rotating disk by approximately half of the outer diameter of the rolling element. ) And the guide groove (39) provided in the fixed body by holding the rolling body between the fixed body (32) provided in the upper portion of the) and the holding part (40a) arranged in the fitting groove in the rotating disk. And a guiding member (40) The guide groove is provided with a guide surface (39a, 39b) directed outward in the rotation side of the rotating disk when the shutter curtain is lowered, and the guide member is a contact portion (40b, 40c) that contacts the guide surface of the guide groove. The above-mentioned problem is solved by providing a shutter (1) characterized in that is provided.

  According to the first aspect of the present invention, the rolling element is not fixed to the storage groove and can freely rotate and move in the storage groove. Further, at the position of the fitting groove, the rolling body can jump out of the storage groove at a predetermined number of rotations of the rotating disk. Specific examples of the rolling element include rollers or spheres, but it is preferable to use rollers having a larger contact area than the spheres in order to reduce the pressure received by contact with other members. An accommodating part is a hollow part of the stationary main body which accommodates a rotating disk and a rolling body. Therefore, the inner peripheral surface of the housing portion is the circumferential surface of the housing portion that faces the end surface of the outer periphery of the rotating disk inside the fixed body. The fitting groove is provided in the upper part of the inner peripheral surface, and the upper part means a part above the rotating shaft of the rotating disk. The direction of the guide surface of the guide groove will be described later. As the guide surface, a flat surface or an arc surface can be used.

  Since the rotating disk is connected to the winding shaft and receives a load, it is preferable to use a metal from the viewpoint of strength. A metal or resin can be used for the rolling element. A metal is preferably used for the fixed body. In addition, since the accommodating part, the fitting groove, and the guide groove are provided inside the fixed main body, it is preferable to manufacture by aluminum die casting from the viewpoint of molding.

  According to a second aspect of the present invention, in the shutter (1) according to the first aspect, the accommodating portion (36) smoothly joins the fitting groove (37) and the inner peripheral surface (36a). ) And an adjustment body (51) that arranges one end face (51a) on the entry surface, and the adjustment body inclines the end face with respect to the entry surface by projecting the fitting groove side of the end face from the entry surface. It has an adjustment means (52).

  According to the first aspect of the present invention, the rolling member that has jumped out of the storage groove is sandwiched between the rotating disk and the sandwiching portion of the guiding member, and the guiding member moves while bringing the contacting portion into contact with the contact surface. Moves outward on the rotating side of the rotating disk. Thereby, the rolling body is carried to a deep position of the fitting groove while being sandwiched. Therefore, the rolling body is not sandwiched between the edge of the storage groove and the edge of the fitting groove. Therefore, this sudden descent stop device can prevent incomplete locking.

  According to the second aspect of the present invention, the end surface is provided with one end face of the adjusting body, and the adjusting body protrudes and tilts the end face of the adjusting body with respect to the entering surface, whereby the rolling body is applied to the derivative. It becomes difficult. Thereby, the lock | rock rotation speed of a winding shaft becomes large. For this reason, a steep descent stop device is manufactured so that the lock rotation speed of the take-up shaft becomes the lower limit rotation speed of the design. Adjust the number to the design speed. Thereby, the dispersion | variation in the lock | rock rotation speed of the winding shaft which had arisen from the tolerance of components can be made small. Accordingly, the strength of the parts can be reduced as compared with the prior art, and the sudden descent stop device becomes small and inexpensive.

  Hereinafter, the shutter according to the present invention will be described based on the embodiment shown in the drawings. However, what is described below is an example of the embodiment of the present invention, and the present invention is not limited to the following description unless it exceeds the gist. Is not to be done.

  FIG. 1 is a diagram schematically showing a shutter 1 according to the present invention. FIG. 1A is a front view, and FIG. 1B is a right side view. In FIG. 1A and FIG. 1B, the inside of the shutter is shown through. In the shutter 1, guide rails 3 are installed perpendicularly to the floor surface at both left and right ends of the shutter curtain 2. The shutter curtain 2 has a winding shaft 4 disposed at the upper side and an upper end. The winding shaft 4 is attached to the bearing bracket 5 via a bearing. The shutter 1 is an electric type, and the shutter curtain is moved up and down by an electric motor. Therefore, an opening / closing machine 20 is connected to one end of the winding shaft 4 (hereinafter referred to as “driving side”) via the sprockets 6 and 7 and the chain 8. A sudden descent stop device 30 is installed at the other end of the winding shaft 4 (hereinafter referred to as “driven side”). An operation switch 9 for operating the shutter 1 is attached to the wall of the building.

  With this configuration, in the shutter 1, the electric motor of the opening / closing machine 20 is driven by the operation of the operation switch 9. Thereby, the winding shaft 4 is rotated via the sprockets 6 and 7 and the chain 8. The shutter curtain 2 is wound up and down along the guide rail 3 by the rotation of the winding shaft 4, and the opening is opened and closed.

  FIG. 2 is an enlarged view of the drive side of the winding shaft 4. The winding shaft 4 is attached to the bearing bracket 5a via a bearing 10a. The opening / closing machine 20 is attached to the bearing bracket 5 a adjacent to the winding shaft 4. The winding shaft 4 and the opening / closing machine 20 are connected via sprockets 6 and 7 and the chain 8. The switch 20 includes an electric motor 21, a speed reducer 22, a brake device 23, and a governor device 24 in series. In FIG. 2, the shutter curtain 2 in a wound state is indicated by a two-dot chain line, and the winding shaft 4 is shown in a transparent manner.

  With this configuration, electricity is supplied to the switch 20 by opening / closing the operation switch 9 (see FIG. 1). As a result, the brake device 23 is released and the electric motor 21 is driven. The rotation of the electric motor 21 is transmitted to the winding shaft 4 via the sprockets 6 and 7 and the chain 8 after being decelerated by the speed reducer 22. As a result, the winding shaft 4 rotates and the shutter curtain 2 is wound up and down.

  In the event of a fire, in order to prevent the spread of fire, the shutter curtain 2 is lowered by its own weight when the brake of the brake device 23 is released in response to a disaster prevention signal, and the shutter 1 (see FIG. 1) is closed. At this time, the governor device 24 is operated at the same time, and the descending speed is reduced. As described above, the brake device 23 is provided with the governor device 24 to take safety measures.

  FIG. 3 is an enlarged view of the driven side of the winding shaft 4. The winding shaft 4 is attached to the bearing bracket 5b via a bearing 10b. The sudden descent stop device 30 is attached by connecting a rotating disk 31 (see FIG. 4) to the take-up shaft 4 and fixing a fixed body 32 (see FIG. 4) to the bearing bracket 5b. Details of the sudden descent stop device 30 will be described later. In FIG. 3, the shutter curtain 2 in a wound state is indicated by a two-dot chain line, and the winding shaft 4 is shown in a transparent manner.

  With this configuration, the rotating disk 31 (see FIG. 4) rotates together with the winding shaft 4. At normal times, the rotary disk 31 rotates inside the fixed body 32 (see FIG. 4), so that the winding shaft 4 can rotate. However, when the winding shaft 4 rotates at a high speed, the rotating disk 31 cannot rotate with respect to the fixed main body 32 in the sudden descent stop device 30 as described later. Thereby, the winding shaft 4 is locked and the shutter curtain 2 is stopped. Therefore, the shutter curtain 2 can be stopped when the shutter curtain 2 suddenly descends by cutting the chain 8 (see FIG. 2).

  FIG. 4 is a front view of the sudden descent stop device 30. FIG. 5 is an enlarged view of the periphery of the fitting groove 37. In FIG. 4, the inside of the steep descent stop device 30 is seen through for the sake of explanation. Moreover, in FIG. 4, when the same member appears repeatedly, a code | symbol is attached | subjected only to some members, and the code | symbol of another member is abbreviate | omitted. Hereinafter, a description will be given with reference to FIGS. 4 and 5. An arrow B indicates the rotation direction of the winding shaft 4 and the rotating disk 31 when the shutter curtain 2 (see FIG. 1) is lowered. The rotating disk 31 is connected to the winding shaft 4. Here, the rotary disk 31 and the winding shaft 4 are integrated by fitting. The shape of the rotating disk 31 is a substantially disk shape having a thickness in the direction perpendicular to the paper surface. A plurality of storage grooves 33, 33,... Are provided on the outer periphery of the rotating disk 31. The storage groove 33 has a semicircular portion on the rotation axis O side of the rotary disk 31 in the cross section, and stores the rolling body 34. The rolling element 34 is a roller or a sphere whose longitudinal direction is the vertical direction of the drawing. Since the rolling body 34 is not fixed to the storage groove 33, it is possible to freely rotate and move the storage groove 33. A recess 35, 35,... For receiving the rolling bodies 34, 34,... Jumping out of the storage groove 33 on the outer periphery of the rotating disk 31 opposite to the rotation direction B is adjacent to the storage grooves 33, 33,. Is provided.

  The stationary main body 32 accommodates the rotating disk 31 and the rolling bodies 34, 34,... In the accommodating portion 36, and is fixed to the bearing bracket 5b (see FIG. 3). The accommodating portion 36 is a substantially disc-shaped hollow portion having a thickness in the direction perpendicular to the paper surface. A gap is provided between the housing portion 36 and the rotating disk 31, so that the rotating disk 31 can be rotated by the housing portion 36. Further, since the gap is large enough to prevent the rolling body 34 from passing through, the rolling body 34 is held in the accommodating portion 36.

  An inner peripheral surface 36 a and a fitting groove 37 are provided on the inner periphery of the accommodating portion 36. The fitting groove 37 is provided at a position above the rotating shaft O of the rotating disk 31 in consideration of gravity and centrifugal force applied to the rolling body 34 so that the winding shaft 4 is locked at a predetermined rotational speed. It is done.

  The fitting groove 37 has a bottom surface 37a and a receiving surface 37b. The inner peripheral surface 36 a and the bottom surface 37 a of the fitting groove 37 are connected by an entry surface 38. The entry surface 38 is a surface that is located on the opposite side of the rotation direction B of the rotary disk 31 with respect to the fitting groove 37, and gently joins the inner peripheral surface 36 a and the bottom surface 37 a of the fitting groove 37. The receiving surface 37b is an arc-shaped surface located on the rotation direction B side of the rotating disk 31 in the fitting groove 37, and is a surface that finally receives the protruding rolling body 34. The depths of the bottom surface 37a and the receiving surface 37b are approximately half the outer diameter of the rolling bodies 34, 34,.

  The fixed body 32 is provided with a guide groove 39 adjacent to the fitting groove 37. The fitting groove 37 and the guide groove 39 are partially connected by a connecting portion. A guide member 40 is disposed in the guide groove 39. The guide member 40 has a clamping part 40a and contact parts 40b and 40c. The sandwiching portion 40 a is disposed in the fitting groove 37 through the connecting portion, and sandwiches the rolling body 34 with the rotating disk 31. The contact portions 40b and 40c are in contact with the guide surfaces 39a and 39b of the guide groove 39, and move the guide member 40 along the guide surfaces 39a and 39b.

  The directions of the guide surfaces 39a and 39b are outward on the rotating side of the rotating disk when the shutter curtain 2 (see FIG. 1) is lowered. The rotation side is the rotation direction B side, and the outer direction is the outward radial direction of the rotary disk 31. Here, the guide surfaces 39a and 39b are shown as planes, but the guide surfaces 39a and 39b are not limited to planes, and may be arcuate surfaces. Even if it is not a plane, the directions of the guide surfaces 39a and 39b can be considered in the same manner as described above.

  With this configuration, when the take-up shaft 4 rotates, the connected rotary disks 31 rotate together. Rotation of the rotating disk 31 causes centrifugal force in addition to gravity on the rolling bodies 34, 34,. However, in the normal operation of the shutter 1 (see FIG. 1), the resultant force due to gravity and centrifugal force generated in the rolling bodies 34, 34,... At the position of the fitting groove 37 does not become an outward force. Therefore, the rolling bodies 34, 34,... Hold the state of being accommodated in the accommodating portion 36 without jumping out. Accordingly, the take-up shaft 4 is not locked by the sudden descent stop device 30, and the normal operation of the shutter 1 is continued.

  FIG. 6 is a diagram illustrating an operating state of the sudden descent stop device 30. In FIG. 6, only the periphery of the fitting groove 37 is shown enlarged. An arrow B indicates the rotation direction of the winding shaft 4 (see FIG. 4) and the rotating disk 31 when the shutter curtain is lowered. When the chain 8 (see FIG. 2) is cut and disconnected, the shaft neck is disconnected, and the sprockets 6 and 7 (see FIG. 2) are disconnected, the sudden descent of the shutter curtain 2 cannot be stopped. Therefore, the winding shaft 4 rotates at a high speed. In this case, the rotating disk 31 that rotates together with the winding shaft 4 also rotates at a high speed, and a large centrifugal force is generated in the rolling bodies 34, 34,. When the winding shaft 4 reaches a predetermined rotational speed, a resultant force due to the gravity and centrifugal force of the rolling bodies 34, 34,... Thereby, the rolling element 34 a jumps out from the storage groove 33 to the fitting groove 37.

  Usually, the rolled-out rolling body 34a reaches the bottom surface 37a along the entry surface 38 as shown in FIG. Since the depth of the bottom surface 37a is substantially half of the outer diameter of the rolling bodies 34, 34,..., The rolling body 34a is sandwiched between the concave portion 35 of the rotating disk 31 and the clamping portion 40a of the guide member 40. In response to the load from the rotating rotating disk 31, the guide member 40 moves in the guide groove 39. At this time, the guide member 40 moves with the contact portion 40b in contact with the guide surface 39a or the contact portion 40c in contact with the guide surface 39b while the rolling body 34a is held between the guide member 40 and the recess 35. Hereinafter, the case where the guide member 40 moves by bringing the contact portion 40b into contact with the guide surface 39a will be described. However, when the contact portion 40c moves while making contact with the guide surface 39b, or the contact portions 40b and 40c that are in contact with each other in the middle. The same applies to the case where changes. 6A, the guide member 40 moves the guide groove 39 in the direction of the arrow C by bringing the contact portion 40b into contact with the surface 39c having a small outward angle of the guide surface 39a.

  As shown in FIG. 6B, when the contact portion 40b reaches the surface 39d having a large outward angle of the guide surface 39a, the guide member 40 brings the contact portion 40b into contact with the surface 39d and moves the guide groove 39 in the direction of arrow D. Move to. In this manner, the guide member 40 moves outward in the rotational direction B side of the rotary disk 31 along the guide surface 39a. The rolling body 34 a moves along the bottom surface 37 a of the fitting groove 37 while being held between the holding portion 40 a of the guide member 40 and the concave portion 35 of the rotating disk 31.

  As shown in FIG. 6C, when the holding portion 40a of the guide member 40 moves to the receiving surface 37b of the fitting groove 37, the holding of the rolling body 34a changes from the holding portion 40a to the receiving surface 37b. Since the depth of the receiving surface 37b is substantially half of the outer diameter of the rolling body 34a, the rolling body 34a is sandwiched between the recess 35 of the rotating disk 31 and the receiving surface 37b of the fitting groove 37. Hereinafter, this clamping is referred to as complete clamping. As a result, the rotating disk 31 cannot rotate with respect to the fixed main body 32, and the winding shaft 4 (see FIG. 4) is locked. Therefore, it is possible to stop the shutter curtain 2 (see FIG. 1) that has been rapidly lowered by the sudden descent stop device 30 (see FIG. 4).

  FIG. 7 is a diagram illustrating an operating state of the sudden descent stop device 30 when the rolling body 34b is incompletely sandwiched. In FIG. 7, only the periphery of the fitting groove 37 is shown enlarged. As in FIG. 6, when the shutter curtain 2 (see FIG. 1) suddenly descends, the rotating disk 31 rotates in the direction of arrow B together with the winding shaft 4 (see FIG. 4). As shown in FIG. 7A, depending on the number of rotations of the winding shaft 4, the rolling body 34b may be pinched at a position where it does not completely protrude into the fitting groove 37. In this case, the rolling body 34 b is sandwiched between the edge portion 41 between the storage groove 33 and the recess 35 and the edge portion 42 of the sandwiching portion 40 a of the guide member 40. This state is an incompletely sandwiched state.

  Incomplete clamping is a state in which the rolling body 34b is unstable compared to complete clamping between the recess 35 and the clamping part 40a shown in FIG. Conventionally, the take-up shaft may be locked in this unstable state, so that the lock is released and the shutter curtain descends again. In this case, the winding shaft was locked by the next rolling body. In the sudden descent stop device 30, when the rolling body 34 b is incompletely clamped, the guide member 40 moves in the guide groove 39 in response to the load from the rotating disk 31 while being incompletely clamped. At this time, the guide member 40 moves with the contact portion 40b in contact with the guide surface 39a or with the contact portion 40c in contact with the guide surface 39b. Hereinafter, the case where the guide member 40 moves by bringing the contact portion 40b into contact with the guide surface 39a will be described. However, when the contact portion 40c moves while making contact with the guide surface 39b, or the contact portions 40b and 40c that are in contact with each other in the middle. The same applies to the case where changes. In FIG. 7A, the guide member 40 moves the guide groove 39 in the direction of arrow C by bringing the contact portion 40b into contact with the surface 39c having a small outward angle of the guide surface 39a.

  As shown in FIG. 7B, when the contact portion 40b reaches the surface 39d having a large outward angle of the guide surface 39a, the guide member 40 holds the contact portion 40b on the surface 39d while incompletely holding the rolling body 34b. The guide groove 39 is moved in the direction of arrow D by making contact. Then, as shown in FIGS. 7C and 7D, the guide member 40 continues to move in the direction of arrow D in response to the load from the rotating disk 31. Thus, the rolling member 34b that has been in the shallow position of the fitting groove 37 due to incomplete clamping is fitted into the rolling member 34b by the guide member 40 moving along the guide surface 39a outward in the rotation side of the rotary disk 31. It is carried to a deep position of the groove 37.

  When the clamping portion 40a of the guide member 40 moves to the receiving surface 37b of the fitting groove 37, the rolling body 34b is clamped by the concave portion 35 of the rotating disk 31 and the receiving surface 37b, as in FIG. It becomes complete clamping. Then, the winding shaft 4 is locked. Therefore, even when the rolling body 34 b is incompletely sandwiched, the rolling body 34 b is completely sandwiched by the guide member 40 moving the rolling body 34 b to a deep position in the fitting groove 37. For this reason, the sudden descent stop device 30 can perform a reliable lock that prevents the descent of the shutter curtain 2 from being resumed.

  The sudden descent stop device 30 described above can be suitably used particularly for a heavy shutter whose product weight exceeds 9,800 N (1,000 kg). With heavy shutters, the shutter curtain is lowered due to the conventional imperfect lock and the shutter curtain moves down again, increasing the kinetic energy of the shutter curtain, causing a large impact on the sudden descent stop device and each part of the shutter when it is locked again. It was. Therefore, it was necessary to make the steep descent stop device and the mounting bracket strong. However, since this is not necessary by using the sudden descent stop device according to the present invention, it is possible to reduce the product price.

  FIG. 8 is a view showing a sudden descent stop device 50 including the adjusting body 51. FIG. 8A is a front view and shows the inside of the sudden descent stop device 50 for the sake of explanation. FIG. 8B is an enlarged view around the adjustment body 51. FIG.8 (c) is the GG cross-sectional enlarged view of FIG.8 (b). In addition, about the thing which takes the same structure as FIG. 4, the code | symbol used in FIG. 4 is attached | subjected and the description is abbreviate | omitted. Moreover, in FIG. 8, when the same member appears repeatedly, a code | symbol is attached | subjected only to some members, and the code | symbol of another member is abbreviate | omitted. In FIG. 8A, an arrow B indicates the rotation direction of the winding shaft 4 and the rotating disk 31 when the shutter curtain 2 (see FIG. 1) descends. The sudden descent stop device 50 includes an adjustment body 51 adjacent to the entry surface 38 of the housing portion 36. The adjusting body 51 has the end surface 51 a disposed on the entry surface 38. The adjusting body 51 has adjusting means for inclining the end surface 51 a with respect to the entry surface 38. Here, an adjusting screw 52 is used as the adjusting means.

  As shown in FIG. 8C, the tip of the adjustment screw 52 on the screwing side is a taper 52a. A recess 52b used for screwing is provided on the opposite end surface. The side surface 52 c is provided with a screw thread and meshes with a screw thread provided on the fixed body 32. As shown in FIG. 8B, the adjustment screw 52 is a position where the end surface 51 a of the adjustment body 51 and the end 51 b on the opposite side across the adjustment body 51 and the taper 52 a are in contact, and the rotating disk of the adjustment body 51. 31 is arranged near the rotation direction B side (fitting groove 37 side) portion (hereinafter referred to as “tip portion”) 51c.

  With this configuration, as shown in FIGS. 8B and 8C, the adjustment screw 52 is screwed in the direction of the arrow E so that the end portion 51b of the adjustment body 51 is pushed in contact with the taper 52a. Tip 51c protrudes in the direction of arrow F. In this way, the end surface 51a is inclined with respect to the entry surface 38. Thereby, it becomes difficult for the rolling body 34 to be applied to the derivative, and the number of rotations at which the winding shaft 4 is locked can be increased.

  Therefore, the sudden descent stop device 50 is manufactured such that the lock rotation speed of the winding shaft 4 becomes the design lower limit rotation speed. When the lock rotation speed is lower than the design lower limit rotation speed due to component tolerances, the adjustment means adjusts the lock rotation speed to the design rotation speed. Thereby, the dispersion | variation in the lock | rock rotation speed of the winding shaft 4 which had arisen from the tolerance of components can be made small. Accordingly, the strength of the parts can be reduced as compared with the prior art, and the sudden descent stop device becomes small and inexpensive. In particular, by making the adjustment screw 52 adjustable from the outside, the number of rotations of the winding shaft 4 that is easily locked can be adjusted. Further, conventionally, when the rotation speed of the winding shaft 4 to be locked is out of the allowable value, the sudden descent stop device is disassembled and reassembled after confirmation. However, such a work load can be reduced by adjusting the lock rotation speed of the winding shaft 4 with the adjusting body 51. Furthermore, even if it is desired to lock at a special rotation speed, it can be easily adjusted. In the sudden descent stop device 50, the guide member 40 and the adjusting means are used in combination, but only the adjusting means can be used alone. Further, the adjusting means is not limited to the adjusting screw 52, and other members can be used as long as the protruding amount of the adjusting body 51 can be adjusted.

  In the above-described sudden descent stop devices 30 and 50, the concave portions 35, 35,... Of the rotating disk 31 are not necessarily provided. However, when the recesses 35, 35,... Are not provided, the rolling bodies 34, 34,... Are sandwiched by the edge between the storage groove 33 and the outer periphery of the rotary disk 31. Therefore, from the viewpoint of stable clamping and protection of the rotating disk 31, it is preferable to provide the rotating disk 31 with recesses 35, 35,.

  In the shutter according to the present invention, as shown in FIGS. 4 to 8, it is preferable that the sudden descent stop devices 30 and 50 include a switch and an urging means for the guide member 40. Here, a micro switch 61 is used as the switch. A coil spring 62 is used as a biasing means for the guide member 40. When the guide member 40 is in the initial position (the position in which the guide member 40 is not moved. The same applies hereinafter), the switch operating portion 40e of the guide member 40 contacts the switch portion 61a of the microswitch 61 when the guide member 40 is in the initial position. It is arranged at the position where. The coil spring 62 is coupled to the guide member 40 and the fixed body 32, and biases the guide member 40 to the initial position. The micro switch 61 is connected to the switch 20. When the switch is on, the switch 20 can be energized. When the switch is turned off, the energization to the switch 20 is cut off. With this configuration, it is possible to prevent the electric motor 21 from being continuously driven when the sudden descent stop devices 30 and 50 are operated, and safety is ensured.

  Further, since energization to the switch 20 is cut off at the time of recovery, the winding shaft 4 is mechanically rotated in the winding direction of the shutter curtain 2 (opposite to the rotation direction B), and the rolling body 34 is rotated. The disk 31 is dropped into the storage groove 33 to release the lock. In this case, the guide member 40 is returned to the initial position by the coil spring 62, and the micro switch 61 is turned on. Thereby, operation with the opening / closing machine 20 becomes possible again.

  In the above embodiment, the case of a steel shutter is shown as an example of the shutter. However, the present invention can also be applied to a shutter other than steel such as a sheet shutter. Further, the sudden descent stop device provided for the shutter according to the present invention is not limited to use for the shutter, but can be applied to other articles such as a notebook.

  While the present invention has been described in connection with embodiments that are presently the most practical and preferred, the present invention is not limited to the embodiments disclosed herein. However, the present invention can be appropriately changed without departing from the spirit or concept of the invention that can be read from the claims and the entire specification, and it is understood that shutters with such changes are also included in the technical scope of the present invention. It must be.

It is a figure which shows typically the shutter which concerns on this invention. It is an enlarged view of the drive side of a winding shaft. It is an enlarged view of the driven side of a winding shaft. It is a front view of a sudden descent stop device. It is an enlarged view around a fitting groove. It is a figure which shows the condition at the time of the operation | movement start of a sudden descent stop apparatus. It is a figure which shows the condition in action of the sudden descent stop apparatus. It is a figure which shows the condition at the time of completion | finish of operation | movement of a sudden descent stop apparatus. It is a figure which shows the condition at the time of the operation | movement start of the sudden descent stop apparatus when a rolling body is pinched incompletely. It is a figure which shows the condition which the action | operation of the sudden descent stop apparatus advanced from Fig.7 (a). It is a figure which shows the condition which the action | operation of the sudden descent stop apparatus advanced from FIG.7 (b). It is a figure which shows the condition which the action | operation of the sudden descent stop apparatus advanced from FIG.7 (c). It is a front view of a sudden descent stop device provided with an adjustment body. FIG. 6 is an enlarged view around the adjustment body 51. It is a GG cross-sectional enlarged view of FIG.8 (b). (A) is a figure which shows the conventional fall prevention apparatus. (B) is a figure which shows the incomplete lock | rock in the conventional fall prevention apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shutter 2 Shutter curtain 4 Winding shaft 20 Opening and closing machine 30 Rapid descent stop device 31 Rotating disk 32 Fixed main body 33 Storage groove 34, 34a, 34b Rolling body 36 Storage part 37 Fitting groove 39 Guide groove 39a, 39b Guide surface 40 Guide member 40a Clamping part 40b, 40c Contact part 50 Sudden descent stop device 51 Adjustment body 52 Adjustment screw 61 Micro switch 62 Coil spring

Claims (2)

Equipped with a sudden descent stop device on the winding shaft that winds up and down the shutter curtain,
The sudden descent stop device is a rotating disk connected to the winding shaft;
A rolling element housed in a plurality of housing grooves provided on the outer periphery of the rotating disk;
The rotating disk is provided with an accommodating portion that accommodates the rotating disk and the rolling element, and the rotating element that protrudes from the accommodation groove by the rotation of the rotating disk is fitted by approximately half the outer diameter of the rolling element. A fixing main body provided with a fitting groove in the upper part of the inner peripheral surface of the housing part,
A guide member that moves the guide groove provided in the fixed body by sandwiching the rolling body by the rotating disk and the sandwiching portion disposed in the fitting groove;
The guide groove is provided with a guide surface directed outwardly on the rotating side of the rotating disk when the shutter curtain descends,
The shutter according to claim 1, wherein the guide member is provided with a contact portion that contacts the guide surface of the guide groove. The accommodating portion has an entry surface that smoothly couples the fitting groove and the inner peripheral surface, and includes an adjustment body with one end surface disposed on the entry surface, and the adjustment body includes the fitting of the end surface. 2. The shutter according to claim 1, further comprising an adjusting unit configured to incline the end surface with respect to the entry surface by projecting the mating groove side from the entry surface.

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