JP6018570B2 - Rotation lock device - Google Patents

Description

  The present invention relates to a rotation lock device that locks rotation of a winding shaft around which a long winding member such as a shutter slat, a blind, or a sheet is wound.

  In a winding device such as a roll blind, a coil spring is used as a clutch spring for locking the rotation of the winding shaft, and the winding member is moved to an arbitrary position by a frictional force generated by reducing or expanding the diameter of the coil spring ( Conventionally, a rotation lock device having a structure of stopping at a height is used (see, for example, Patent Document 1).

  The rotation lock device disclosed in Patent Document 1 uses a clutch spring made of a coil spring for a winding spring that rotates a winding shaft in the winding direction of a winding member such as a screen, and the clutch spring has a reduced diameter. Alternatively, the winding rotation of the winding shaft is allowed or locked by expanding the diameter. In this rotation lock device, a heart cam having a plurality of locking grooves is formed on the outer periphery of a fixed shaft that rotatably supports the winding shaft. The heart cam has a plurality of engagement grooves for moving the engagement end on one end side of the clutch spring in an engaged state. The plurality of locking grooves are formed to lock the drawn screen at an arbitrary position and to slightly pull out the drawn-up winding member to reduce the diameter of the clutch spring and unlock the clutch spring. ing.

JP 2006-161413 A

  In the conventional rotation lock device described above, the drawn-up winding member can be stopped at an arbitrary position. However, if the winding member is slightly pulled out of this stop position, the clutch spring is unlocked, The member is wound on the winding shaft as it is. For this reason, the winding member cannot be pulled out further from the stop position. As a result, the conventional rotation lock device has a problem that the take-out of the winding member cannot be adjusted steplessly.

Further, in the conventional rotation lock device, since the winding member cannot be pulled out further when the winding member is pulled out to the maximum, the clutch spring cannot be unlocked, and the winding member can be wound as it is. Can not. Therefore, when used for a shutter, the slat (winding member) cannot be wound up from the maximum pulled out state. Further, since it is necessary to keep the clutch spring in the unlocked state at the maximum drawing time, the winding force of the winding spring acts on the winding member in the maximum drawing state. Therefore, in order to maintain the maximum drawn state, an external holding member for holding the drawn-out state of the winding member against the winding force by the winding spring is necessary, and the structure becomes complicated. There is.

  The present invention has been made in consideration of such a conventional problem, and even when the winding member once pulled out is further pulled out, the winding member can be stopped at that position. An object of the present invention is to provide a rotation lock device that can adjust the drawing-out of the take-up member steplessly and that does not require a holding member for holding the maximum drawn-out state of the take-up member.

  The rotation lock device of the present invention is a rotation lock device that locks the rotation of a winding shaft around which a winding member is wound and rotatably supported by a fixed shaft in the winding direction by the urging force of the winding spring. A one-way clutch mechanism provided between the take-up shaft and the fixed shaft, allowing the take-up shaft to rotate in the pull-out direction of the take-up member and switching the lock in the reverse direction; A lock release mechanism that is rotatably provided on the fixed shaft and that switches the one-way clutch mechanism by the rotation, and is attached to the fixed shaft so as to be detachable from the lock release member, and is locked by engagement with the lock release member. A lock plate that locks the rotation of the release member and holds the one-way clutch mechanism in a state where the winding shaft is allowed to rotate; and the one-way clutch mechanism that allows the winding shaft to rotate. Characterized in that the unlocking member to the state is rotated and an operating member to engage the lock release member and the lock plate.

In the present invention, the one-way clutch mechanism is wound around the fixed shaft and the winding shaft in a diameter-reduced state by rotating the winding shaft in the pull-out direction of the winding member, and has one end A lock spring locked to the fixed shaft, and the unlocking member is attached to the fixed shaft so as to be rotatable in a direction of expanding the diameter of the lock spring with the other end of the lock spring locked. The lock plate locks rotation of the unlocking member by engagement with the unlocking member to hold the lock spring in an expanded state, and the operation member locks the lock spring in a direction in which the lock spring expands in diameter. It is preferable to rotate the release member to engage the lock release member and the lock plate.
The one-way clutch mechanism includes a ratchet tooth provided on the take-up shaft side, a torque transmission member provided on the fixed shaft so as to be movable back and forth in the contact / separation direction with respect to the take-up shaft, and the torque transmission Formed by a ratchet tooth that is provided on a member and detachably engages with a ratchet tooth on the winding shaft side, the lock release member moves the torque transmitting member forward and backward by rotation, and the lock plate The rotation of the unlocking member is locked by engagement with the unlocking member to release the engagement between the ratchet teeth on the torque transmitting member side and the ratchet teeth on the winding shaft side, and the operation member is the lock It is preferable to rotate the release member to move the torque transmission member in a direction in which the ratchet teeth of the torque transmission member mesh with the ratchet teeth on the winding shaft side. .
The rotation of the winding shaft in the winding direction does not affect the rocking of the lock plate, and the rotation of the winding shaft in the pulling direction acts so that the lock plate is disengaged from the lock release member. It is preferable that a reversing piece that contacts the lock plate is provided on the winding shaft.
Preferably, the lock plate is swingably attached to the fixed shaft, one end side can be engaged with the lock release member, and the other end side can be brought into contact with the reversing piece.
Further, it is preferable that the unlocking member has a cylindrical shape that is rotatably inserted on the fixed shaft, and the lock plate is swingable on the outer peripheral side of the unlocking member.
Further, a guide slit that obliquely intersects with the forward and backward movement of the torque transmission mechanism is provided in the lock release member, and a guide pin that slides in the guide slit so as to be relatively movable is provided in the torque transmission mechanism. It is preferable.

  According to the present invention, even if the winding member stopped at an arbitrary position is further pulled out, the one-way clutch mechanism locks the rotation of the winding shaft in the winding direction. It is not wound up. Therefore, the winding member can be further pulled out from an arbitrary pulling position, and the drawing-out of the winding member can be adjusted steplessly.

  According to the present invention, the one-way clutch mechanism is unlocked by rotating the unlocking member by the operating member and engaging the lock plate, and the winding shaft is allowed to rotate. It can be rotated in the winding direction. For this reason, the winding member can be wound up by operating the operating member even at the maximum drawing position of the winding member, and an external holding member for holding the winding member at the maximum drawing position becomes unnecessary, and the structure Can be simple.

It is a front view showing a rotation lock device of one embodiment of the present invention. It is a sectional view showing a state that incorporates a rotation lock device in winding ToSo location. It is the sectional view on the AA line in FIG. (A) is a front view of a lock release member, (b) is sectional drawing. (A) is a front view of a lock plate, (b) is a side view. It is sectional drawing which shows the state which complete | finished winding of the winding member. It is sectional drawing which shows the state until it starts pulling out a winding member, and pulls out to the maximum. It is sectional drawing which shows the state from the start of winding of a winding member to the end of winding. It is sectional drawing which shows operation | movement of an inversion piece. It is sectional drawing which shows another operation | movement of an inversion piece. It is a front view which shows the drawing-out state and winding state of the winding member in another embodiment of this invention. The rotation locking device of FIG. 11 is a cross sectional view showing a state incorporated in the winding device. It is sectional drawing and the expanded sectional view which show the state of the ratchet tooth in the state of FIG. It is sectional drawing which shows the relationship between the lock plate in the state of FIG. 11, and a lock release member. It is a front view when a ratchet tooth of another embodiment of the present invention comes off. The rotation locking device of FIG. 15 is a cross sectional view showing a state incorporated in the winding device. It is sectional drawing and the expanded sectional view which show the state of the ratchet tooth in the state of FIG. It is sectional drawing which shows the relationship between the lock plate and lock release member in the state of FIG. It is a front view which shows the state which winds up a winding member from the drawing-out state of the winding member in another embodiment of this invention, and a maximum drawing-out state. The rotation lock device 19 is a cross sectional view showing a state incorporated in the winding device. It is sectional drawing and the expanded sectional view which show the state of the ratchet tooth in the state of FIG. It is sectional drawing which shows the relationship between the lock plate in the state of FIG. 19, and a lock release member. (A) And (b) is the side view and longitudinal cross-sectional view of the rotating shaft in another embodiment of this invention. (A) And (b) is the side view and longitudinal cross-sectional view of the fixed piece in another embodiment of this invention. (A) And (b) is the side view and sectional drawing of the torque transmission member in another embodiment of this invention. (A), (b), (c) is the front view of a lock release member in another embodiment of the present invention, a longitudinal section, and a sectional view from the side. It is a front view of the return spring in another embodiment of the present invention. It is a front view which shows the deformation state of another embodiment. It is sectional drawing which shows the state which integrated the rotation lock apparatus of FIG. 28 in the winding device .

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. 1 to 10 show a rotation lock device 1 according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the rotation lock device 1 is incorporated in a winding device 2 that winds a long winding member 3 such as a slat, a blind, or a sheet of a shutter.

  As shown in FIGS. 1 to 3, the winding device 2 has a fixed shaft 4, a winding shaft 5, and a winding spring 6. Both ends of the fixed shaft 4 are fixed to the wall surface of the building, and the winding shaft 5 is rotatably supported by passing through the winding shaft 5. The winding shaft 5 is formed in a horizontally long cylindrical shape through which the fixed shaft 4 passes. A long winding member 3 such as a blind or a slat is wound around the outer peripheral surface of the winding shaft 5, and the winding shaft 5 is rotated around the winding shaft 5 in the winding direction (α direction in FIG. 3). While being taken up, the take-up shaft 5 is drawn out from the take-up shaft 5 by the rotation in the pull-out direction (β direction in FIG. 3). Rotating shafts 7 and 11 that are constituent members of the winding shaft 5 are fixed by fitting into both ends of the winding shaft 5 in the length direction, and the fixed shaft 4 is fixed to the inner surfaces of these rotating shafts 7 and 11. The winding shaft 5 is supported by the fixed shaft 4 so as to be rotatable in forward and reverse directions (α and β directions in FIG. 3) by penetrating so as to come into contact. The left and right rotating shafts 7 and 11 rotate integrally with the rotation of the winding shaft 5 in the forward and reverse directions. The rotation lock device 1 of this embodiment is provided on one side (left side) of the rotary shaft 11 at both ends of the winding shaft 5.

  A coil spring is used as the take-up spring 6 and is disposed inside the cylindrical take-up shaft 5 with the fixed shaft 4 penetrating therethrough. The winding spring 6 has a hook portion 6 a on one end side locked to the fixed shaft 4 and a hook portion 6 b on the other end side locked to the rotating shaft 7. Accordingly, when the winding shaft 5 rotates in the pulling direction (β direction) by pulling out the winding member 3, a spring force is accumulated in the winding spring 6, and the spring force causes the winding shaft 5 to wind in the winding direction (α Acting to rotate in the direction).

  The rotation lock device 1 is disposed on the rotation shaft 11 side which is a constituent member of the winding shaft 5, and includes a lock spring 12 as a one-way clutch mechanism, a lock release member 13, a lock plate 15, and an operation member 17. , And an inversion piece 19.

  The rotating shaft 11 is formed by a cylindrical shaft main body 11a through which the fixed shaft 4 passes, and a flange portion 11b integrally extending from the shaft main body 11a in the axial direction (left direction) of the take-up shaft 5. Thus, it rotates together with the take-up shaft 5. The flange portion 11b is formed so as to be positioned on the radially outer side with respect to the shaft body 11a. As shown in FIG. 3, the flange portion 11b is formed in a semicircular arc shape. Further, as shown in FIG. 1, the flange portion 11b is formed so that the width thereof becomes smaller as the distance from the winding shaft 5 is increased, so that the flange portion 11b covers a part of the shaft body 11a from the outside. ing. The inversion piece 19 is attached to the flange portion 11b.

  A fixed piece 21 is fixed to the end of the fixed shaft 4 on the rotating shaft 11 side. As shown in FIG. 3, the fixed piece 21 is formed in a cylindrical shape that is extrapolated to the fixed shaft 4, and the pin 22 is inserted into the fixed shaft 4 and the fixed piece 21, so that the fixed piece 21 is fixed to the fixed shaft 4. Fixed. Such a fixed piece 21 constitutes a part of the fixed shaft 4.

  The lock spring 12 constitutes a one-way clutch mechanism. The one-way clutch mechanism is provided between the take-up shaft 5 (rotary shaft 11) and the fixed shaft 4 (fixed piece 21), and allows the take-up shaft 5 to rotate in the pull-out direction of the take-up member 3 in the reverse direction. The rotation is switched to lock the rotation. In this embodiment, a lock spring 12 is used as a one-way clutch mechanism.

  The lock spring 12 is a coil spring having a coil portion 12c. The lock spring 12 made of a coil spring has a coil portion 12c wound around a shaft body 11a of a fixed piece 21 (fixed shaft 4) and a rotating shaft 11 (winding shaft 5). The lock spring 12 is wound around the shaft body 11a of the fixed piece 21 and the rotating shaft 11 with the coil portion 12c having a reduced diameter, and between the coil portion 12c and the shaft body 11a of the fixed piece 21 and the rotating shaft 11. There is a friction torque. One end 12 a of the lock spring 12 is locked to the fixed piece 21, and the other end 12 b is locked to the lock release member 13. The lock spring 12 is wound around the fixed piece 21 and the rotating shaft 11 so that the coil portion 12c is rotated in the diameter-expanding direction of the rotating shaft 11 in the drawing direction (β direction) of the winding member 3.

  The unlocking member 13 is formed in a cylindrical shape, and is rotatably inserted into the fixed piece 21 and the shaft main body 11 a of the rotating shaft 11. In this case, the coil portion 12 c of the lock spring 12 is disposed inside the lock release member 13. 2 and 4, a hook slit 13a is formed at the end of the unlocking member 13 on the winding shaft 5 side, and the other end 12b of the lock spring 12 is connected to the hook slit 13a. The other end 12 b is locked to the unlocking member 13 by being inserted. In such a structure, the diameter of the coil portion 12c of the lock spring 12 can be increased by rotating the lock release member 13. When the diameter of the lock spring 12 is increased, the friction torque of the lock spring 12 with respect to the rotary shaft 11 disappears or decreases, so that the rotary shaft 11, that is, the winding shaft 5 can be rotated in the forward and reverse directions.

  As shown in FIG. 4, in order to attach the lock plate 15 to the end of the unlocking member 13 opposite to the hook slit 13a, an elongated attachment hole 13b extending in the radial direction is formed. Further, a flange portion 13c is formed at an end portion outside the mounting hole 13b, and this flange portion 13c serves as a guide for winding an operation member 17 described later. The lock release member 13 extends so as to be longer than the flange portion 11b of the rotary shaft 11, and the flange portion 13c is positioned outside the flange portion 11b so that the operation member 17 can be smoothly wound around the lock release member 13. It is possible to do. Further, the lock release member 13 is formed with an engagement hole 13d with which the lock plate 15 is detachably engaged.

  The lock plate 15 is attached to the fixed piece 21 (fixed shaft 4). The lock plate 15 is located on the outer peripheral side of the lock release member 13 so as to sandwich the lock release member 13 between the lock plate 15 and is attached to the fixed piece 21 in this state. FIG. 5 shows the lock plate 15, which is formed in a planar L shape in which an attachment piece 15 a attached to the fixed piece 21 and an abutment piece 15 b bent at a right angle from the attachment piece 15 a are integrated. . An attachment hole 15c for attaching to the fixed piece 21 is formed in the attachment piece 15a.

  As shown in FIGS. 3 and 5 (b), the mounting piece 15a of the lock plate 15 is formed in a bent shape along the outer periphery of the unlocking member 13, and the tip on the opposite side to the contact piece 15b. The portion is formed with an engaging claw 15d that enters and engages with an engaging hole 13d formed in the unlocking member 13. Thus, the engagement claw 15d enters and engages with the engagement hole 13d, so that the lock plate 15 engages with the lock release member 13, and the rotation of the lock release member 13 is locked by this engagement. The engagement between the lock plate 15 and the lock release member 13 is performed after the lock release member 13 is rotated and the lock spring 12 is expanded in diameter.

  The lock plate 15 is attached to the fixed piece 21 so that the contact piece 15b is positioned on the flange 11b side of the rotating shaft 11 (see FIG. 1). The attachment of the lock plate 15 to the fixed piece 21 is performed by bringing the attachment piece 15a into contact with the outer peripheral surface of the lock release member 13 so that the attachment hole 15c faces the attachment hole 13b of the lock release member 13 as shown in FIG. In this state, the presser pin 23 is passed through the mounting holes 15c and 13b, and the presser pin 23 is screwed into the fixing piece 21. Further, by attaching the presser spring 24 made of a plate spring to the presser pin 23, the attachment piece 15a of the lock plate 15 is elastically pressed against the outer peripheral surface of the lock release member 13 (FIGS. 9 and 10). reference). In such a mounting structure, the lock plate 15 can swing around the presser pin 23 on the outer peripheral side of the lock release member 13, and the engagement claw 15 d engages with the lock release member 13 by this swing. Engage or disengage from the hole 13d. In this case, the presser pin 23 is provided so as to be located on the same line as the hook slit 13 a of the lock release member 13, that is, to be located on the same circumference of the lock release member 13. Thereby, the rocking | fluctuation center of the lock plate 15 and the other side hook 12b of the lock spring 12 are located on the same periphery.

  The operation member 17 is formed of a string member having one end fixed to the outer periphery of the unlocking member 13 and the other end being a free end. The operation member 17 is operated to rotate the lock release member 13 in the direction in which the lock spring 12 expands in diameter. The operation member 17 is not limited to the string member as long as the lock release member 13 can be rotated, and may be a hook member formed in a cut-and-raised shape on the lock release member 13.

  The reversing piece 19 is attached to the flange portion 11b of the rotating shaft 11 so as to be in a position corresponding to the contact piece portion 15b of the lock plate 15. In order to attach the reversing piece 19 to the flange portion 11b, as shown in FIGS. 9 and 10, the flange portion 11b is formed with a through hole 11c penetrating in the thickness direction. An attachment pin 25 is attached in a penetrating manner in the through hole 11c, and the reversing piece 19 is rotatably attached to the attachment pin 25. In this case, the reversing piece 19 is attached to the attachment pin 25 so that the tip portion is extracted from the through hole 11c. A contact portion 19 a is formed at the tip of the reversing piece 19. The contact portion 19 a comes into contact with or slides against the contact piece 15 b of the lock plate 15. The contact portion 19a is formed as a tapered surface. The taper of the taper surface is inclined so as to approach the lock release member 13 along the winding direction (α direction) of the winding member 3. In such a reversing piece 19, when the winding shaft 5 (rotating shaft 11) rotates in the direction (β direction) to pull out the winding member 3, the corner portion of the contact portion 19a is the contact piece portion 15b of the lock plate 15. And abutment piece 15b is pushed. For this reason, the lock plate 15 swings and the engagement claw 15 d acts so as to come out of the engagement hole 13 d of the lock release member 13. On the other hand, in the rotation of the winding shaft 5 (rotary shaft 11) in the winding direction of the winding member 3 (α direction), the tapered surface of the contact portion 19a slides in contact with the contact piece portion 15b of the lock plate 15. . For this reason, in this direction, the lock plate 15 is not disengaged from the engagement with the lock release member 13, and the lock plate 15 is kept engaged with the lock release member 13.

  A return spring 27 made of a torsion spring is attached to the attachment pin 25 in the through hole 11 c, and one end of the return spring 27 is in contact with the reversing piece 19. The return spring 27 returns the reversing piece 19 to the original state when the reversing piece 19 rotates toward the through hole 11c.

  Next, the operation of this embodiment will be described. 6 shows a state in which the winding of the winding member 3 has been completed, FIG. 7 shows a state in which the winding member 3 has been started to be pulled out until it is fully pulled out, and FIG. 8 shows that the winding of the winding member 3 has started. Shows the status up to the end of taking. 9 and 10 show the operation of the reversing piece 19 in these states.

  As shown in FIG. 6, in the state where the winding member 3 has been wound, the lock claw 15 d is engaged with the lock release member 13 by the engagement claw 15 d entering the engagement hole 13 d. In this state, the coil portion 12c of the lock spring 12 is in a diameter-expanded state, so that the rotating shaft 11 (winding shaft 5) is in an unlocked state. Therefore, the winding member 3 can be pulled out, and the rotary shaft 11 (winding shaft 5) rotates in the pulling direction (β direction) by pulling out the winding member 3, and the state shifts to the state shown in FIG.

  Due to the rotation of the rotating shaft 11 in the β direction as the winding member 3 is pulled out, the corner portion of the contact portion 19a of the reversing piece 19 comes into contact with the contact piece portion 15b of the lock plate 15, and the contact piece portion 15b is moved. Operates to push. As a result, the lock plate 15 swings about the presser pin 23, and the swinging movement causes the engagement claw 15 d to come out of the engagement hole 13 d and the engagement between the lock plate 15 and the lock release member 13 is released ( FIG. 7). By releasing the engagement of the lock plate 15 with the unlocking member 13, the lock spring 12 is reduced in diameter, and a friction torque is generated between the shaft body 11 a of the rotary shaft 11. Thereby, rotation of the rotating shaft 11 (winding shaft 5) is locked. Therefore, the winding member 3 stops being pulled out at an arbitrary position. On the other hand, in the lock spring 12, the winding direction of the winding member 3 (β direction) is the diameter-expanding direction of the coil portion 12c, so that the winding member 3 can be further pulled out from the stop position.

At this time, if the withdrawal of the winding member 3 is stopped at an arbitrary position, the winding shaft 5 returns to the winding direction (α direction) due to the restoring force of the winding spring 6. The lock spring 12 is reduced in diameter to be in a winding lock state in which the rotation of the winding shaft 5 in the winding direction (α direction) is locked.
As the take-up member 3 is pulled out, the rotary shaft 11 rotates in the β direction, and the contact piece 15b of the lock plate 15 contacts the contact portion 19a of the reversing piece 19. At this time, the contact of the lock plate 15 The inversion piece 19 rotates so as to escape from the portion 15b. For this reason, the lock plate 15 and the lock release member 13 hold the disengaged state. In such an operation, since the winding member 3 can be further pulled out from an arbitrary pulling position, the drawing-out of the winding member 3 can be adjusted steplessly.

  FIG. 8 shows a state in which the lock release member 13 is rotated by operating the operation member 17 with respect to an arbitrary pulled-out state and a maximum pulled-out state of the winding member 3. The rotation direction of the lock release member 13 by the operation on the operation member 17 is a direction in which the diameter of the coil portion 12c of the lock spring 12 is increased. By the rotation of the unlocking member 13, the engaging claw 15d enters the engaging hole 13d, and the lock plate 15 and the unlocking member 13 are engaged. For this reason, the diameter-expanded state of the lock spring 12 is maintained, and the rotating shaft 11 (winding shaft 5) is unlocked. Thereby, the winding shaft 5 is rotated in the winding direction (α direction) by the torque of the winding spring 6 of the winding device 2 and the winding member 3 is wound. In the winding direction (α direction) of the winding member 3, the taper surface of the contact portion 19 a of the reversing piece 19 comes into contact with the contact piece portion 15 b of the lock plate 15. It turns to escape. For this reason, since the lock plate 15 does not swing and the engagement claw 15d does not enter the engagement hole 13d, the engagement state between the lock plate 15 and the lock release member 13 is maintained. As a result, the state in which the lock by the lock spring 12 is released is maintained, so that the winding member 3 can be pulled out not only after winding of the winding member 3 but also before winding is completed. In such an operation, the winding member 3 can be wound up by operating the operation member 17 even at the maximum drawing position of the winding member 3. For this reason, an external holding member for holding the winding member 3 at the maximum drawing position is not required, and the structure can be simplified.

  In this embodiment, the return from the winding state to the rotation locked state at the time of pulling out is performed every 360 °, but the present invention is not limited to this and is provided on the flange portion 11b of the rotating shaft 11. By providing a plurality of reversing pieces 19 on the circumference of the flange portion 11b, the timing for returning to the rotation locked state can be increased. For example, by providing two sets every 180 °, it can be set to return to the rotation locked state every 180 °.

  11 to 27 show a rotation lock device 1A according to another embodiment of the present invention. 1 to 10 uses the lock spring 12 formed of a coil spring as the one-way clutch mechanism, the ratchet mechanism is used as the one-way clutch mechanism 31 in this embodiment.

  The one-way clutch mechanism 31 includes a winding shaft side ratchet tooth 32 formed on the rotating shaft 11 (winding shaft 5), a torque transmission member 33 provided on the fixed piece 21 fixed to the fixed shaft 4, and a torque transmission member. It is formed by a fixed shaft side ratchet tooth 34 that is formed on the take-up shaft side ratchet tooth 32 and is detachably engaged with the take-up shaft side ratchet tooth 32. As shown in FIGS. 13, 17, and 21, the take-up shaft side ratchet teeth 32 and the fixed shaft side ratchet teeth 34 are engaged with each other in a disengageable manner in an oblique state.

  As shown in FIG. 23, the take-up shaft side ratchet teeth 32 have an annular shape provided along the circumference on the end face of the shaft body 11 a of the rotating shaft 11 on the fixed piece 21 side. The fixed shaft side ratchet teeth 34 have an annular shape provided circumferentially on the end surface of the torque transmission member 33 on the rotating shaft 11 side so as to have the same diameter as the winding shaft side ratchet teeth 32.

  The torque transmission member 33 is provided on the fixed piece 21 (fixed shaft 4), and the fixed piece 21 is formed with a cylindrical attachment portion 35 that is thinned in steps to attach the torque transmission member 33. Yes. The attachment portion 35 is integrally formed with the fixed piece 21 so as to extend in the direction of the rotation shaft 11. As shown in FIG. 24, the cylindrical attachment portion 35 is a non-circular shape whose outer surface is cut in parallel, and the torque transmission member 33 is extrapolated to the attachment portion 35. The inner surface of the torque transmission member 33 that contacts the mounting portion 35 is a non-circular shape cut in parallel as shown in FIG. Thereby, the torque transmission member 33 is rotationally restrained with respect to the fixed piece 21 (fixed shaft 4), and the torque transmission member 33 can linearly advance and retreat in the axial direction of the fixed piece 21 in this rotationally restricted state. It has become. The torque transmitting member 33 approaches and separates from the rotating shaft 11 (winding shaft 5) by the linear advance and retreat movement of the fixed piece 21 in the axial direction. Then, the fixed shaft side ratchet teeth 34 and the winding shaft side ratchet teeth 32 mesh with each other due to the approaching movement toward the rotating shaft 11 (winding shaft 5), and the moving away from the rotating shaft 11 (winding shaft 5). The meshing of these ratchet teeth 32, 34 is released.

  The forward / backward movement of the torque transmission member 33 is performed by the rotation of the lock release member 13. A guide pin 37 and a guide slit 38 are formed to convert the rotation of the unlocking member 13 into the forward / backward movement of the torque transmission member 33. As shown in FIGS. 12, 16, 20, and 25, the guide pin 37 is integrally formed with the torque transmission member 33 so as to protrude from the torque transmission member 33.

As shown in FIGS. 11, 15, 19 and 26, the guide slit 38 is formed in the lock release member 13. The guide slit 38 is a long hole extending so as to obliquely intersect the direction of linear movement of the torque transmission member 33, and the guide pin 37 of the torque transmission member 33 slides in this guide slit 38. Is plugged in. In such a structure, when the lock release member 13 rotates, the guide pin 37 relatively moves in the guide slit 38, and the torque transmission member 33 is linearly moved back and forth with this relative movement.

As shown in FIGS. 12, 16, and 20, a return spring 39 is disposed between the torque transmission member 33 and the fixed piece 21. As shown in FIG. 27, the return spring 39 is a coil spring, and is arranged between the torque transmission member 33 and the fixed piece 21 so that the torque transmission member 33 is rotated by the rotary shaft 11 (winding shaft 5). It is energized to move in the direction of. The return spring 39 can be made of a material other than a coil spring such as a disc spring, a leaf spring, or a rubber plate.

  The other members in the rotation lock device 1A of this embodiment are the same as those in the rotation lock device 1 shown in FIGS. 1 to 3, and are assigned the same reference numerals as those in the rotation lock device 1.

Next, the operation of the rotation lock device 1A will be described. 11 to 18 show an arbitrary pulled-out state of the winding member 3 and a winding lock state. FIGS. 11 to 12 show the ratchet teeth 32 and 34 engaged with each other as the operating state of the one-way clutch mechanism 31, and FIGS. 14 is in the drawer state,
A state in which the ratchet teeth 32 and 34 are rotated and climbed is shown. 19 to 22 show a state where the ratchet teeth 32 and 34 are disengaged in a state where the winding member 3 is being wound.

When the winding member 3 is arbitrarily pulled out and in the winding lock state, as shown in FIGS. 11 to 18, the rotation lock device 1 </ b> A is engaged by the ratchet operation of the ratchet teeth 32 and 34 of the one-way clutch mechanism 31 and the rotation ratchet operation. Operates.
As shown in FIGS. 11 to 13, the guide pin 37 of the torque transmitting member 33 is positioned on the left end side of the guide slit 38 of the rotating shaft 11, and the torque transmitting member 33 moves to the rotating shaft 11 side and moves to FIG. As shown, the fixed shaft side ratchet teeth 34 mesh with the take-up shaft side ratchet teeth 32. By this meshing, the rotation of the take-up shaft 5 in the take-up direction (α direction) of the take-up member 3 is locked and a take-up lock state is established. In this case, as shown in FIGS. 14 to 18, the winding shaft 5 can rotate with respect to the direction (β direction) in which the oblique teeth of the ratchet teeth 32, 34 are removed. By rotating the take-up shaft 5 in the direction), the ratchet teeth 32 can rotate while retreating the ratchet teeth 34 in the axial direction and get over as shown in FIG.
At this time, if the withdrawal of the winding member 3 is stopped at an arbitrary position, the winding shaft 5 returns to the winding direction (α direction) due to the restoring force of the winding spring 6. The teeth 32 and 34 are instantaneously engaged with each other as shown in FIGS. 11 to 14, and the winding shaft 5 in the winding direction (α direction) can be obtained even when the ratchet teeth 32 and 34 are not engaged when the drawer is stopped. The rotation is locked and the winding is locked.

  As the winding member 3 is pulled out, the rotating shaft 11 rotates in the β direction as shown in FIG. 14, and the contact piece 15b of the lock plate 15 contacts the contact portion 19a of the reversing piece 19. The reversing piece 19 is rotated so as to escape from the contact portion 15b of the lock plate 15. For this reason, the lock plate 15 and the lock release member 13 hold the disengaged state. In such an operation, since the winding member 3 can be further pulled out from an arbitrary pulling position, the drawing-out of the winding member 3 can be adjusted steplessly.

  19 to 22 show a state when the winding member 3 is wound up by operating the operation member (not shown) from the arbitrary pulled-out state and the maximum pulled-out state of the winding member 3 to rotate the unlocking member 13. Show. The guide pin 37 of the torque transmission member 33 is positioned on the right end side of the guide slit 38 of the unlocking member 13, and the torque transmission member 33 is retracted from the rotating shaft 11 (winding shaft 5) side. . At this time, as shown in FIG. 22, the engagement claw 15d of the lock plate 15 enters the engagement hole 13d of the lock release member 13, and the lock plate 15 and the lock release member 13 are engaged, so that the lock release member 13 is Since the rotation is stopped, the torque transmission member 33 is stopped at the retracted position. At the retracted position of the torque transmitting member 33, the fixed shaft side ratchet teeth 34 are released from meshing with the take-up shaft side ratchet teeth 32 as shown in FIG. Therefore, the rotary shaft 11 (winding shaft 5) can rotate in both directions α and β. The winding shaft 5 is rotated in the α direction by the torque of the winding spring 6, and the winding member 3 is wound. Is done. During the winding operation, the winding member 3 can be pulled out.

In the above embodiment, as in the embodiment shown in FIGS.
By providing a plurality of reversing pieces 19 provided on the flange portion 11b of the rotating shaft 11 on the circumference of the flange portion 11b, the timing for returning to the rotation locked state can be increased. For example, by providing two reversing pieces 19 every 180 °, it can be set to return to the rotation locked state every 180 °.

  As described above, when the ratchet mechanism including the ratchet teeth 32 and 34 meshing with each other is used as the one-way clutch mechanism 31, the overall length of the rotation lock device 1A can be shortened, and the size and weight can be reduced. There are benefits. 18 and 29 show variations of this embodiment in order to reduce the size and weight. The length of the rotating shaft 11 is shortened by shortening the shaft body 11a of the rotating shaft 11 on which the take-up shaft side ratchet teeth 32 are formed, and shortening the flange portion 11b accordingly. The length of the fixed piece 21 on the fixed shaft side ratchet teeth 34 side is also shortened. Thereby, rotation lock device 1A becomes short, and it can reduce in size and weight by that much.

  As described above, according to the rotation lock device of the present invention, since the winding member 3 can be further pulled out from an arbitrary pulling position, the pulling-out of the winding member 3 can be adjusted steplessly. Further, since the winding member 3 can be wound up by operating the operating member 17 even at the maximum drawing position of the winding member 3, an external holding member for holding the winding member 3 at the maximum drawing position is provided. It becomes unnecessary and the structure can be simplified.

1, 1A Rotation lock device 3 Winding member 4 Fixed shaft 5 Winding shaft 6 Winding spring 11 Rotating shaft 12 Lock spring (one-way clutch mechanism)
12a one end 12b other end 13 unlocking member 13d engagement holes 15 lock plate 15d engaging claw 17 operating member 19 counterclockwise Utatekoma 21 fixed piece 31 one-way clutch mechanism 32 vol shaft side ratchet teeth 33 the torque transmitting member 34 fixed side ratchet teeth 37 Guide pin 38 Guide slit

Claims (7)

A rotary lock device that locks rotation in which a winding shaft wound around a winding member and rotatably supported by a fixed shaft rotates in a winding direction by an urging force of a winding spring,
A one-way clutch mechanism, which is provided between the winding shaft and the fixed shaft, allows the rotation of the winding shaft in the pull-out direction of the winding member, and switches to lock the rotation in the reverse direction;
A lock release member that is rotatably provided on the fixed shaft, and performs switching of the one-way clutch mechanism by the rotation;
A lock plate that is attached to the fixed shaft so as to be engageable with and disengageable from the unlocking member, and locks the rotation of the unlocking member by engagement with the unlocking member to hold the one-way clutch mechanism in a rotation-permitted state of the winding shaft. When,
A rotation lock device comprising: an operation member that rotates the lock release member to engage the lock release member and the lock plate so that the one-way clutch mechanism is allowed to rotate the winding shaft. . The one-way clutch mechanism is wound around the fixed shaft and the winding shaft in a diameter-reduced state by rotating the winding shaft in the pull-out direction of the winding member, and one end is engaged with the fixed shaft. A locked spring,
The unlocking member is attached to the fixed shaft so as to be rotatable in a direction of expanding the diameter of the lock spring with the other end of the lock spring being engaged,
The lock plate locks the rotation of the unlocking member by engagement with the unlocking member and holds the lock spring in an expanded state,
2. The rotation lock device according to claim 1, wherein the operation member rotates the lock release member in a direction in which the diameter of the lock spring expands to engage the lock release member and the lock plate. The one-way clutch mechanism includes a take-up shaft side ratchet tooth provided on the take-up shaft side, a torque transmission member provided on the fixed shaft so as to be movable back and forth in the contact and separation direction with respect to the take-up shaft, A fixed shaft side ratchet tooth that is provided on the torque transmission member and detachably engages with the winding shaft side ratchet tooth;
The unlocking member moves the torque transmitting member forward and backward by rotation,
The lock plate locks the rotation of the unlocking member by engagement with the unlocking member to release the meshing between the fixed shaft side ratchet teeth and the winding shaft side ratchet teeth,
2. The rotation lock according to claim 1, wherein the operation member rotates the lock release member to move the torque transmission member in a direction in which the fixed shaft side ratchet teeth mesh with the take-up shaft side ratchet teeth. apparatus.   The rotation of the winding shaft in the winding direction does not affect the rocking of the lock plate, but the rotation of the winding shaft in the pulling direction causes the lock plate to be disengaged from the engagement with the unlocking member. The rotation lock device according to any one of claims 1 to 3, wherein a reversing piece abutting on the lock plate is provided on the winding shaft.   The lock plate is swingably attached to the fixed shaft, one end side can be engaged with the lock release member, and the other end side can be brought into contact with the reversing piece. 4. The rotation lock device according to 4.   The lock release member has a cylindrical shape rotatably inserted on the fixed shaft, and the lock plate is swingable on the outer peripheral side of the lock release member. 5. The rotation lock device according to 5.   A guide slit that obliquely intersects the forward and backward movement of the torque transmission member is provided in the lock release member, and a guide pin that slides relative to the guide slit is provided in the torque transmission member. The rotation lock device according to claim 3.

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