JP2018141342A - Shielding device and winder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shielding device capable of reducing an excessive load acting on a head box due to a foreign matter being caught on an elevating cord and suppressing the elevating cord from being divided at the time of the reduction. SOLUTION: A winding shaft 16 is a plurality of elevating cords 15 for raising and lowering a screen 13 by raising and lowering a weight bar 14 arranged at the lowermost part of a screen 13 which is suspended and supported from a head box 11. , The elevating cord 15 having the extra winding is wound up. The sum of the load of the weight bar 14 and the load of the screen 13 when the weight bar 14 is in the upper limit position is the maximum load, and N torque limiters 29 are provided for each take-up shaft (N is 2 or more). Integer) Prepare. The torque operated by each of the torque limiters is set to be equal to or less than the maximum load, and the total operating load of the N-1 torque limiters 29 is set to be equal to or greater than the maximum load. [Selection diagram] Fig. 1

Description

  The present invention relates to a shielding device and a winding device.

  In a shielding device such as a horizontal blind or a roll-up blind, a weight bar is arranged at the lowermost part of a shielding material supported by being suspended from a head box. And the weight bar is raised / lowered by winding or unwinding the raising / lowering cord suspended from the head box, and the shielding material is raised / lowered (see Patent Document 1). In this type of shielding device, a cord joint is provided on the lifting cord. When a cord joint is caught in a lifting cord and an excessive tensile force is applied to the lifting cord, the lifting cord is divided by the cord joint to reduce an excessive load on the shielding device, and the foreign matter is caught or Suppress the fall.

International Publication No. 2011/129345

  However, after the lifting / lowering cord is divided by the cord joint, the user is forced to perform a troublesome work of reconnecting the divided cord joint when using the shielding device.

  The present invention provides a shielding device and a winding device that alleviate an excessive load acting on a shielding device due to a foreign object being caught on the lifting cord, and that can prevent the lifting cord from being divided during the reduction. The purpose is to provide.

  A shielding device that solves the above-described problem is provided between a shielding material supported from above, a lifting cord that lifts and lowers the shielding material by raising and lowering a lower end portion of the shielding material, and a winding shaft and a drive shaft. The torque limiter is configured to rotate relative to the take-up shaft and the drive shaft at a predetermined torque or more, and does not rotate relative to each other during the lifting operation.

  In the shielding apparatus, the shielding apparatus includes a plurality of the lifting / lowering cords, the shielding member is suspended from a head box, a weight bar is disposed at the bottom, and is lifted / lowered together with the weight bar by the lifting / lowering cords, In the head box, it is preferable that one torque limiter is provided on each winding shaft.

  In the shielding apparatus, it is preferable that the lifting cord is longer than the length from the head box to the lowest position of the weight bar by an extra winding.

  In the shielding apparatus, the sum of the weight bar load and the shielding material load when the weight bar is at the upper limit position is a maximum load, and N torque limiters (N is an integer of 2 or more) are provided. In this case, it is preferable that the torque at which each of the torque limiters is operated is set so that the sum of the torques at which N−1 torque limiters are operated is equal to or greater than the maximum load.

  In the above-described shielding device, the shielding device further includes an operation unit that performs an elevating operation on the shielding material, and a code joint that can divide the elevating cord when a tensile force is applied to the elevating cord. Is connected to the operation shaft and the winding shaft, and is connected to the winding shaft via the torque limiter, and the torque limiter is connected to the winding shaft and the drive prior to the division of the cord joint. It is preferable to rotate relative to the shaft.

  In the shielding device, the shielding device suspends and supports the screen as the shielding material from the head box, suspends and supports the weight bar at the lower end portion of the screen, and winds below the weight bar. One end of the lifting / lowering cord is attached to the head box, and the other end of the lifting / lowering cord is wound or rewound by the winding shaft, so that the screen can be wound or unwound and lifted / lowered. Preferably, it is a roll-up blind.

  The shielding apparatus may further include a reset bar configured to be separated from the weight bar and the shielding material through the inside of the loop of the lifting / lowering cord that is suspended from the head box and wound by the weight bar. preferable.

  In the shielding apparatus, the weight bar includes a fixed bar to which a lower end portion of the screen is fixed, and the reset bar configured to be detachable from the fixed bar and separated from the shielding material. It is preferable.

  In the above shielding device, the torque limiter rotates the transmission member that rotates integrally with the drive shaft, the shaft member that rotates integrally with the take-up shaft, and the transmission member and the shaft member integrally by frictional force. And a frictional force generating member that idles the shaft member with respect to the transmission member with a torque greater than or equal to the predetermined.

In the shielding apparatus, the winding shaft is a first winding shaft, one end portion of the lifting / lowering cord is wound around the first winding shaft, and the other end portion of the lifting / lowering cord is used as a second winding shaft. It is preferable that the torque limiter is wound on the second winding shaft.
In the above-described shielding device, it is preferable that the second winding shaft winds up the extra winding of the lifting cord.

  A winding device that solves the above problems includes a winding shaft portion that winds up and down a lifting cord that lifts and lowers a shielding material, and an input portion that is provided on the winding shaft portion and to which a drive shaft that rotates the winding shaft portion is connected. And the winding shaft portion and the input portion are configured to rotate relative to each other with a predetermined torque or more.

  A shielding device that solves the above problem is connected to a shielding material supported from above, an elevating cord that elevates and lowers the shielding material by elevating a lower end portion of the shielding material, and one end portion of the elevating cord. A first winding shaft that winds up the one end side by being rotated by the shaft, a second winding shaft that is connected to the other end of the lifting cord and winds up the other end side, and the second A torque limiter attached to the winding shaft, and the second winding shaft is rotatable relative to the head box.

  A shielding device that solves the above problems includes a shielding material supported from above, a plurality of lifting cords that lift and lower the shielding material by raising and lowering a lower end portion of the shielding material, and a winding that winds the lifting cord A suspension body including the shielding material when the lower end portion of the shielding material is at the upper limit position, and N (N is an integer of 2 or more) torque limiters provided one for each winding shaft. The load is the maximum load, the operating torque of each of the torque limiters is set to be equal to or less than the maximum load, and the sum of the operating loads of the N-1 torque limiters is equal to or greater than the maximum load. Has been.

  According to the present invention, the shielding device and the winding device that reduce the excessive load acting on the shielding device due to the foreign matter caught on the lifting cord, and that can suppress the lifting cord from being divided during the reduction. An apparatus can be provided.

The front view of the roll-up blind in 1st Embodiment. The side view of the roll-up blind in 1st Embodiment. The side view of the state which rolled up the screen in the roll-up blind in 1st Embodiment. The exploded perspective view of a torque limiter. Sectional drawing of a torque limiter. The front view of the state where the extra volume of one raising / lowering cord was pulled out. The side view of the roll up blind in 2nd Embodiment. The perspective view of the weight bar used for the roll-up blind in 3rd Embodiment. The perspective view of a fixed bar and a reset bar. The front view of the state which arranged all the raising / lowering cords in the same length with the reset bar. The perspective view which shows the modification of the attachment or detachment structure of the fixing bar and reset bar which comprise the weight bar shown in 3rd Embodiment. The side view which shows notionally the modification of the weight bar shown in 3rd Embodiment. Sectional drawing which shows notionally the modification which connected the fixing bar and the reset bar with the mainspring. In 4th Embodiment, the perspective view which shows notionally the head box which provided the winding shaft which winds up the extra part of a raising / lowering cord separately. The disassembled perspective view of the torque limiter of 5th Embodiment. Sectional drawing of the torque limiter of 5th Embodiment. Sectional drawing of the torque limiter of 6th Embodiment.

Hereinafter, with reference to FIGS. 1-17, one Embodiment of the shielding apparatus which concerns on this invention is described.
[First Embodiment]
As shown in FIG. 1 and FIG. 2, the roll-up blind 1 has a head box 11 attached to a mounting surface via a mounting bracket 12, and is used as a shielding material that is composed of a wood shaving on the back of the head box 11. The upper end of the screen 13 is attached.

  A weight bar 14 formed of a cylindrical shape is attached to the lower end of the screen 13. One end of the plurality of lifting cords 15 for lifting the weight bar 14 is attached to the back surface of the head box 11, and the other end is wound under the weight bar 14 in the head box 11. It is attached to the shaft 16 so that it can be wound up in a spiral. Accordingly, the weight bar 14 is supported by a plurality of lifting cords 15 wound below the weight bar 14.

  The winding shaft 16 is rotatably supported by a bearing member 17 disposed in the head box 11, and the other end of the lifting / lowering cord 15 is attached. The take-up shaft 16 has a hexagonal bar-like drive shaft 18 inserted in the center thereof so as to be relatively rotatable. The lifting / lowering cord 15 wound around the winding shaft 16 is set to a length having an extra winding portion wound around the winding shaft 16 in addition to the length for positioning the weight bar 14 at the lowest position. ing. The extra winding portion is a portion that is unwound from the winding shaft 16 when an excessive tensile force is applied to the lifting / lowering cord 15.

  An operation unit 19 is attached to one end of the head box 11, and a ball chain 21 is hooked on a pulley 20 that is rotatably supported in the operation unit 19. When the ball chain 21 is operated to rotate the pulley 20 in the forward / reverse direction, the drive shaft 18 is rotated in the forward / reverse direction.

  As shown in FIGS. 2 and 3, when the winding shaft 16 is rotated in the winding direction of the lifting / lowering cord 15 based on the rotation of the drive shaft 18, one of the lifting / lowering cords 15 that support the weight bar 14 is pulled up. Therefore, the weight bar 14 is rotated and lifted while winding the screen 13, and the screen 13 is wound around the weight bar 14.

  In the operation unit 19, the rotational torque of the pulley 20 that is rotationally driven by the operation of the ball chain 21 is transmitted to the drive shaft 18 and further transmitted to the take-up shaft 16 via the torque limiter 29. As shown in FIGS. 4 and 5, the torque limiter 29 includes a transmission member 30 as an input portion to which the drive shaft 18 connected to the pulley is connected so as not to be relatively rotatable, and a friction composed of a torsion coil spring. A limit spring 31 as a force generating member and a shaft member 32 connected to the winding shaft 16 as a winding shaft portion are provided. As shown in FIG. 5, the transmission member 30 includes a cylindrical portion 30a, and a limit spring 31 is mounted on the outer peripheral surface of the cylindrical portion 30a. The transmission member 30 is inserted into the cylindrical shaft member 32. Both end portions of the limit spring 31 are engaged with a locking portion 32 a formed on the inner peripheral surface of the shaft member 32.

  With such a configuration, the shaft member 32 and the transmission member 30 are always rotated integrally based on the frictional force between the limit spring 31 and the cylindrical portion 30a. Further, in a state where the load acting on the shaft member 32 integral with the winding shaft 16 is increased and its rotation is impeded, the limit spring 31 rotates idly with respect to the transmission member 30.

The transmission member 30 is connected to the pulley 20 through a plurality of gears, pulleys, and the like so that the drive shaft 18 connected to be relatively non-rotatable. When the pulley 20 is rotated, the driving force is transmitted to the transmission member 30. The The torque limiter 29 is provided integrally with each winding shaft 16. The drive shaft 18 that cannot rotate relative to the transmission member 30 closest to the operation unit 19 is inserted in a state in which the center of the winding shaft 16 is relatively rotatable, and transmission of the torque limiter 29 corresponding to the next winding shaft 16 is transmitted. The member 30 is inserted in a state where relative rotation is impossible.
The winding shaft 16 and the torque limiter 29 can be handled as an integral part and assembled to the head box 11.

  As shown in FIG. 6, B1, B2, B3... Are set as operating loads that are torques at which the torque limiters 29 corresponding to the winding shafts 16 are operated, and A is a total operating load of all the torque limiters 29. Then, G is the maximum load of the suspended body when the screen 13 is wound around the weight bar 14 and the weight bar 14 is at the upper limit position. The maximum load G is, for example, the sum of the weight bar 14 load and the screen 13 load. In this case, the total operating load A is set to be equal to or greater than the maximum load G, and when the weight bar 14 is at the upper limit position, the weight bar 14 does not fall down and the screen 13 is not unwound. Further, the operating load B that is the torque for operating each torque limiter 29 is set so that the sum of the operating loads of the N−1 torque limiters 29 is equal to or greater than the maximum load G. Further, the operating load B is set to be equal to or less than the maximum load G. As a result, even if one lifting / lowering cord 15 is cut, the remaining lifting / lowering cord 15 can support the screen 13 and the weight bar 14.

  The head box 11 has a known stopper device 22 for preventing the weight bar 14 from lowering its own weight, and the rotation speed of the drive shaft 18 when the weight bar 14 is lowered by releasing the operation of the stopper device 22. A governor device 23 is provided for limiting the lowering speed of the weight bar 14 (see FIG. 1).

Next, the operation of the roll-up blind 1 configured as described above will be described.
When the ball chain 21 is operated to rotate the winding shaft 16 in the winding direction of the lifting / lowering cord 15 via the pulley 20, the torque limiter 29 and the drive shaft 18, the lifting / lowering cord 15 spirals to the winding shaft 16. It is wound up. Then, the weight bar 14 rises while winding the screen 13. When the weight bar 14 is pulled up to the upper limit, as shown in FIG. 3, the weight bar 14 around which the screen 13 is wound is hidden behind the front balance 24 and is blocked from the room view. In addition, the balance 24 is provided also in the rear part, and the weight bar 14 which wound up the screen 13 is hidden.

  If the ball chain 21 is released while the weight bar 14 is pulled up to a desired height, the stopper device 22 operates to prevent the weight bar 14 from dropping its own weight. When the weight bar 14 is suspended and supported at a desired height and the ball shaft 21 is operated to slightly rotate the drive shaft 18 in the lifting / lowering cord winding direction, the operation of the stopper device 22 is released, The winding shaft 16 can freely rotate in the lifting / lowering cord rewinding direction. Then, the weight bar 14 descends while rewinding the screen 13 in a state where the descending speed is limited by the governor device 23.

  For example, when the weight bar 14 is lowered to the lowest position, the weight bar 14 is close to the floor. Accordingly, foreign matter may be caught in one lifting / lowering cord 15 and an excessive tensile force exceeding the operating load B of one torque limiter 29 provided on the winding shaft 16 of the lifting / lowering cord 15 may be applied. In such a case, the torque limiter 29 divides the winding shaft 16 and the transmission member 30 that transmits the driving force. That is, the shaft member 32 of the winding shaft 16 is idle with respect to the transmission member 30. As a result, the lifting / lowering cord 15 is pulled out from the winding shaft 16 (see the lifting / lowering cord 15 indicated by the rightmost dotted line in FIG. 6).

  The plurality of lifting / lowering cords 15 are elongated only by the pulled lifting / lowering cords 15. In this case, the lifting / lowering cord 15 that is not pulled is also pulled so as to have the same length as the lifting / lowering cord 15 that has been pulled longer, and the extra winding portion is pulled out. Next, the extra winding portion of all the lifting / lowering cords 15 is wound around the winding shaft 16, and the state where the lifting / lowering cords 15 are slack with respect to the weight bar 14 is eliminated.

According to the first embodiment, the following effects can be obtained.
(1-1) When a resident or the like is caught on the lifting / lowering cord 15, the extra winding portion is pulled out from the winding shaft 16 by the torque limiter 29. Therefore, the elevating cord 15 can be provided with a fail-safe function without providing a cord joint.

  (1-2) The operating load of each torque limiter 29 is such that the sum of the operating loads of the N−1 torque limiters 29 is equal to or greater than the maximum load G. Thereby, even if one lifting / lowering cord 15 is cut, the screen 13 and the weight bar 14 can be supported by the remaining lifting / lowering cord 15. Therefore, it is possible to reduce an excessive load acting on the roll-up blind due to the foreign matter caught on the lifting / lowering cord 15. In addition, since the lifting / lowering cord is not divided during the reduction, the lifting / lowering cord 15 can be repaired easily.

[Second Embodiment]
As shown in FIG. 7, in the roll-up blind according to the second embodiment, each lift cord 15 is provided with a cord joint 25. The cord joint 25 includes a pair of joint main bodies 25a and 25b and a connecting portion 25c that connects the joint main bodies 25a and 25b in the lifting cord 15. One joint body 25a is connected to the first cord portion 15a near the fixed end with respect to the head box 11 in the lifting cord 15, and the other joint body 25b is connected to the second cord portion 15b near the winding shaft 16. The Only when an excessive tensile force exceeding the normal tensile force is applied to the lifting / lowering cord 15, one of the joint bodies 25a and 25b is detached from the connecting portion 25c by the elasticity of the synthetic resin. The torque limiter 29 divides the connection between the winding shaft 16 and the drive shaft 18 before the cord joint 25 is divided.

According to the second embodiment, the following effects can be obtained.
(2-1) Even when an excessive tensile force is applied to the lifting / lowering cord 15, first, the torque limiter 29 functions and the extra winding portion of the lifting / lowering cord 15 is drawn from the winding shaft 16. Therefore, the possibility that the lifting / lowering cord 15 is divided can be reduced. Even if the extra winding portion of the lifting / lowering cord 15 is pulled out from the winding shaft 16, the cord joint 25 divides the lifting / lowering cord 15 only when an excessive tensile force is applied. Thereby, a two-stage fail-safe function can be provided.

[Third Embodiment]
The roll-up blind is provided with a torque limiter 29 so that when the excessive tensile force is applied, only the lifting cord 15 is pulled out from the winding shaft 16. Therefore, only the pulled up / down cord 15 of the plurality of up / down cords 15 becomes long (see the up / down cord 15 shown by the rightmost dotted line in FIG. 6). In this case, at the beginning of the repairing work, it is necessary to pull out the extra winding portion so that the lifting cord 15 that is not pulled has the same length as the lifting cord 15 that has been pulled longer. As shown in FIGS. 8 and 9, in the third embodiment, the weight bar 40 includes a fixed bar 41 and a reset bar 42 that are divided in the longitudinal direction. A reset bar 42 is detachably attached to the fixed bar 41.

  As shown in FIG. 8, as an example, the fixing bar 41 has a semi-cylindrical shape, and includes a first mounting surface 41a that is a flat side surface. The first mounting surface 41 a includes an engagement hole 41 b that positions and fixes the reset bar 42. Further, the fixed bar 41 is fixed at the lower edge of the screen 13.

  The reset bar 42 is a member that makes a pair with the fixed bar 41, has a semi-cylindrical shape, and includes a second mounting surface 42a that is a flat side surface. The second mounting surface 42a includes an engagement pin 42b that is engaged with the engagement hole 41b of the first mounting surface 41a. In addition, an engagement groove 43 with which the elevating cord 15 is engaged is formed on the outer surface formed by the arc surfaces of the fixed bar 41 and the reset bar 42. The engaging groove 43 is provided corresponding to the position where the lifting / lowering cord 15 is suspended. The fixed bar 41 and the reset bar 42 are joined during normal use, and the whole has a cylindrical shape, and is used as the weight bar 40 in this state. One of the fixing bar 41 and the reset bar 42 is provided with a magnet, and the other is made of a material such as iron that can be magnetically attracted. Thereby, attachment and detachment of the fixing bar 41 and the reset bar 42 can be further facilitated.

  During normal use, when the screen 13 is wound up, the weight bar 40 winds up the screen 13. When the screen 13 is pulled out, the weight bar 40 is exposed. In this state, when an excessive tensile force is applied, only the lifting / lowering cord 15 is pulled out from the winding shaft 16 and only the lifting / lowering cord 15 becomes longer. In this case, the lifting / lowering cord 15 that is not pulled needs to be aligned with the same length as the lifting / lowering cord 15 that is pulled longer.

  As shown in FIG. 10, in this case, first, the reset bar 42 is removed from the fixed bar 41. Next, the reset bar 42 is lowered to the position of the elongated lifting / lowering cord 15 while being substantially parallel to the fixed bar 41 and passing through the loops of all the lifting / lowering cords 15. Then, with respect to the lifting / lowering cord 15 which is not lengthened, the extra winding is drawn from the winding shaft 16 so that all the lifting / lowering cords 15 have the same length. Thereafter, the extra winding portion of all the lifting / lowering cords 15 is wound around the winding shaft 16 to eliminate the state where the lifting / lowering cords 15 are slack with respect to the weight bar 14.

According to the third embodiment, the following effects can be obtained.
(3-1) By using the reset bar 42, the lengths of the other lifting / lowering cords 15 can be easily aligned with the lengths of the lifting / lowering cords 15 that have been pulled and lengthened. Thereby, the repair work of the raising / lowering cord 15 can be made easy.

(3-2) During normal use, the reset bar 42 is attached to and integrated with the fixed bar 41. Therefore, it is possible to prevent the reset bar 42 that is not frequently used from being lost.
(3-3) Since the fixing bar 41 and the reset bar 42 are magnetically attracted, the fixing bar 41 and the reset bar 42 can be easily attached and detached.
(3-4) The fixing bar 41 and the reset bar 42 can be easily attached and detached simply by engaging / disengaging the engaging pin 42b with respect to the engaging hole 41b.

The third embodiment can also be implemented with appropriate modifications as follows.
Even if the engagement pin is provided on the first mounting surface 41a of the fixing bar 41 and the engagement hole is provided on the second mounting surface 42a of the reset bar 42, the same effect as the above (3-4) can be obtained.
When the fixing bar 41 and the reset bar 42 are configured to be magnetically attractable, the configuration of the engagement pins and the engagement holes may be omitted.

  The attachment / detachment of the fixing bar 41 and the reset bar 42 can be realized also by the configuration as shown in FIG. As shown in FIG. 11, elastic pieces 44 having engagement holes 44 a are provided at both ends of the fixing bar 41, and protrusions 44 b are provided at both ends of the reset bar 42. When the reset bar 42 is attached to the fixed bar 41, the elastic piece 44 is bent to engage the protrusion 44b with the engagement hole 44a. When the reset bar 42 is removed from the fixed bar 41, the elastic piece 44 is bent to remove the protrusion 44b from the engagement hole 44a. Also with such a configuration, the fixing bar 41 and the reset bar 42 can be easily attached and detached.

It should be noted that elastic pieces 44 having engagement holes 44 a may be provided at both ends of the reset bar 42 and protrusions 44 b may be provided at both ends of the fixing bar 41.
In addition, in the configuration of FIG. 11, a configuration capable of magnetically attracting the fixing bar 41 and the reset bar 42 may be added, or a configuration of an engagement pin or an engagement hole may be added.

The fixing bar 41 and the reset bar 42 can be connected by a connecting member so that the reset bar 42 is not lost. As shown in FIG. 12, the connection cord 45 extends to the front and back of the screen 13 via the roller 46 in the head box 11. An end portion of the cord 45 a extending on one surface, for example, the back surface is fixed to the fixing bar 41 and is inserted into the insertion hole 47 of the reset bar 42. In addition, an operation portion 45c is provided on the other surface, for example, an end portion of the cord 45b extending on the surface. In this case, the reset bar 42 can be lowered with respect to the fixed bar 41. Further, when the reset bar 42 is attached to the fixed bar 41, the reset bar 42 can be lifted by pulling the operating portion 45 c downward, and the work of attaching the reset bar 42 to the fixed bar 41 is assisted. Can do.
In addition, in the structure of FIG. 12, you may add the structure which can adsorb | suck the fixed bar 41 and the reset bar 42 further, and may add the structure of an engagement pin or an engagement hole.

As shown in FIG. 13, the reset bar 42 and the fixed bar 41 may be connected by a mainspring 48 configured by a spiral spring. In this case, when the reset bar 42 is removed from the fixed bar 41, the mainspring 48 extends. When the reset bar 42 is attached to the fixed bar 41, the mainspring 48 is rewound. Thereby, the operation | work when mounting the reset bar 42 to the fixed bar 41 can be assisted.
In addition, in the structure of FIG. 13, you may add the structure which can adsorb | suck the fixing bar 41 and the reset bar 42 further, and may add the structure of an engagement pin or an engagement hole.

  The reset bar 42 may be disposed in the head box 11 or the like and removed from the head box 11 and used only when necessary. In this case, the weight bar having the same configuration as the weight bar 14 can be used.

[Fourth Embodiment]
In the first to fourth embodiments, one take-up shaft (first take-up shaft) 16 is provided for each lifting / lowering cord 15, and the extra winding portion of the lifting / lowering cord 15 is wound around the winding shaft 16. However, the excess winding may be wound around a winding shaft 49 that is another second winding shaft. As shown in FIG. 14, in this case, a torque limiter 50 similar to the torque limiter 29 is provided on the winding shaft 49 as the winding shaft portion. As an example, the winding shaft 49 and the torque limiter 50 are provided on the side where the lifting / lowering cord 15 is fixed to the head box 11. The extra winding is unwound from the winding shaft 49 when an excessive tensile force is applied to the lifting / lowering cord 15.

[Fifth Embodiment]
As shown in FIGS. 15 and 16, the torque limiter 29 can also be configured as follows. The torque limiter 61 includes a transmission member 62 as an input portion to which a drive shaft 18 connected to a pulley is connected in a relatively non-rotatable manner, a disc spring 69 as a frictional force generating member constituted by a spring, and a winding shaft. And a shaft member 63 connected to the winding shaft 16 as a portion. The transmission member 62 includes a cylindrical portion 62a, and a cam member 64 is supported on the outer peripheral surface of the cylindrical portion 62a so as to be rotatable and movable in the axial direction of the cylindrical portion 62a. The flange 65 facing the cam member 64 of the transmission member 62 is provided with an uneven portion 65a. The cam member 64 also has an uneven portion 64a on the outer peripheral surface. A concave groove 66 is formed at the tip of the cylindrical portion 62a. The shaft member 63 includes a cylindrical space portion 68 therein, and houses the cylindrical portion 62a of the transmission member 62 and the cam member 64. And the uneven part 64a has friction and is engaged with the uneven part 65a. The flange portion 67 of the transmission member 62 is provided with a convex portion 67a. The concave groove 66 and the convex portion 67 a are engaged, and the transmission member 62 is supported to be rotatable with respect to the shaft member 63.

  The distal end portion of the transmission member 62 is fitted into the cylindrical space portion 68 of the shaft member 63 so as to cover the cam member 64. And the uneven part 64a formed in the outer peripheral surface of the cam member 64 at equal intervals engages with the uneven part 68a formed in the side surface of the cylindrical space part 68. FIG. As a result, the cam member 64 is rotated integrally with the shaft member 63 and is supported so as to be movable in the axial direction with respect to the shaft member 63.

  A disc spring 69 as a frictional force generating member is disposed between the cam member 64 and the shaft member 63, and the cam member 64 moves toward the flange portion 65 by the disc spring 69 having the shaft member 63 as a fulcrum. The portion 62a is biased in the axial direction. Therefore, the concavo-convex portion 64 a of the cam member 64 and the concavo-convex portion 65 a of the flange portion 65 are always engaged by the biasing force of the disc spring 69, and the rotation of the transmission member 62 is transmitted to the shaft member 63 via the cam member 64. The A coil spring can be used instead of the disc spring 69.

  When the lifting cord 15 is pulled with an excessive tensile force, the cam member 64 idles with respect to the transmission member 62 while the uneven portion 64 a of the cam member 64 gets over the uneven portion 65 a of the flange portion 65. Therefore, even if an excessive tensile force acts on the shaft member 63 integral with the winding shaft 16, the tensile force is absorbed by the idle rotation of the cam member 64.

In the torque limiter 61 configured as described above, the same operational effects as the torque limiter 29 can be obtained, and the following operational effects can be obtained. When the cam member 64 idles with respect to the transmission member 62, the concave and convex portion 64a of the cam member 64 rotates idly while getting over the concave and convex portion 65a of the flange portion 65, so that a collision sound can be generated. Thereby, it can be recognized that the lifting / lowering cord 15 has been unwound from the winding shaft 16.
Further, the winding shaft 16 and the torque limiter 61 can be handled as an integral part and assembled to the head box 11.

[Sixth Embodiment]
The sixth embodiment is an example in which the torque limiter 61 described in the fifth embodiment is provided on the winding shaft 49 serving as the second winding shaft described in the fourth embodiment. As shown in FIG. 17, in this case, the frame 71 constituting the head box 11 is provided with an attachment piece 72 as an attachment portion for attaching the transmission member 62, and the transmission member 62 is attached to the attachment piece 72. It has been. As an example, the transmission member 62 does not rotate with respect to the attachment piece 72. Therefore, when an excessive tensile force is applied to the lifting / lowering cord 15, the winding shaft 49 rotates with respect to the frame 71 of the head box 11. That is, the shaft member 63 integral with the winding shaft 49 rotates with respect to the transmission member 62 integral with the frame 71, and the extra winding portion of the lifting / lowering cord 15 is unwound from the winding shaft 49.

The sixth embodiment can be implemented with appropriate modifications as follows.
The torque limiter 29 can be used instead of the torque limiter 61. Further, a torque limiter having another configuration may be used.

In addition, the said 1st Embodiment-6th Embodiment can also be suitably changed and implemented as follows.
The configuration of the torque limiters 29 and 61 is not limited to the examples shown in FIGS. 4 and 5 and FIGS. 15 and 16 and can be variously changed.
-It can be applied to shielding devices equipped with lifting cords such as roll screens, roman shades, horizontal blinds.
-As a shielding apparatus, it is good also as a structure which a head box is abbreviate | omitted. In this case, the screen 13 as a shielding material may be directly fixed to the ceiling or the like, or may be supported by a support member other than the head box.
The weight bar 14 may not be directly fixed to the lower end portion of the screen 13. For example, the weight bar 14 may be supported on the screen 13 directly or via a child part such as a ring, as in a roman shade.
-The raising / lowering cord 15 may be one.
The torque limiter may not be provided corresponding to all the winding shafts 16.
-The raising / lowering cord 15 does not need to be provided with the extra winding part. Even if the lifting / lowering cord has no extra winding, for example, when the weight bar 14 is at an intermediate position between the upper limit position and the lower limit position, when a predetermined torque is applied, the torque limiter It can be rotated relative to the drive shaft.

  DESCRIPTION OF SYMBOLS 1 ... Roll-up blind, 11 ... Head box, 12 ... Mounting bracket, 13 ... Screen, 14 ... Weight bar, 15 ... Elevating cord, 15a ... First cord part, 15b ... Second cord part, 16 ... Winding shaft, DESCRIPTION OF SYMBOLS 17 ... Bearing member, 18 ... Drive shaft, 19 ... Operation part, 20 ... Pulley, 21 ... Ball chain, 22 ... Stopper device, 23 ... Governor device, 24 ... Balance, 25 ... Cord joint, 25a ... Joint main body, 25b ... Joint body, 25c ... connecting part, 29 ... torque limiter, 30 ... transmission member, 30a ... cylindrical part, 31 ... limit spring, 32 ... shaft member, 32a ... locking part, 40 ... weight bar, 41 ... fixed bar, 41a ... first mounting surface, 41b ... engagement hole, 42 ... reset bar, 42a ... second mounting surface, 42b ... engagement pin, 43 ... engagement groove, 4 ... elastic piece, 44a ... engagement hole, 44b ... projection, 45 ... connection cord, 45a ... cord, 45b ... cord, 45c ... operation part, 46 ... roller, 47 ... insertion hole, 49 ... winding shaft, 50 ... Torque limiter, 61 ... Torque limiter, 62 ... Transmission member, 62a ... Cylindrical portion, 63 ... Shaft member, 64 ... Cam member, 64a ... Uneven portion, 65 ... Flange portion, 65a ... Uneven portion, 66 ... Uneven groove, 67 ... flange part, 67a ... convex part, 68 ... cylindrical space part, 68a ... uneven part, 69 ... disc spring, 71 ... frame, 72 ... mounting piece.

Claims (14)

A shielding material supported from above;
An elevating cord for elevating and lowering the shielding material by elevating and lowering a lower end portion of the shielding material;
A torque limiter interposed between the winding shaft and the drive shaft,
The torque limiter is configured to rotate relative to the take-up shaft and the drive shaft with a torque greater than or equal to a predetermined torque, and does not rotate relative to each other during the lifting / lowering operation. The shielding device is
A plurality of the lifting cords are provided,
The shielding material is suspended from the head box, a weight bar is disposed at the bottom, and is lifted and lowered together with the weight bar by the lifting cord,
The shielding device according to claim 1, wherein the head box includes one torque limiter for each winding shaft. The shielding apparatus according to claim 2, wherein the lifting cord is longer than the length from the head box to the lowest position of the weight bar by an extra winding. The sum of the weight bar load and the shielding material load when the weight bar is in the upper limit position is the maximum load,
In the case of providing N torque limiters (N is an integer of 2 or more),
4. The shielding device according to claim 2, wherein the torque at which each of the torque limiters is operated is set such that a total sum of the torque at which N−1 torque limiters are operated is equal to or greater than the maximum load. The shielding device is
An operation unit for raising and lowering the shielding material;
A cord joint capable of dividing the lifting cord when a tensile force is applied to the lifting cord;
The drive shaft connects the operation unit and the winding shaft, and is connected to the winding shaft via the torque limiter,
The shielding device according to any one of claims 1 to 4, wherein the torque limiter is rotated relative to the winding shaft and the drive shaft before the cord joint is divided. The shielding device is
A screen as the shielding material is suspended and supported from the head box, the weight bar is suspended and supported at a lower end portion of the screen, and one end portion of the lifting cord wound below the weight bar is attached to the head box. 3. A roll-up blind that is attached to the other end of the lifting / lowering cord and is wound or unwound by the winding shaft so that the screen can be wound or unwound to be lifted / lowered. The shielding apparatus as described. The shielding according to claim 6, further comprising a reset bar configured to be separated from the weight bar and the shielding material through an inside of a loop of the lifting / lowering cord suspended from the head box and wound by the weight bar. apparatus. The weight bar includes a fixed bar to which a lower end portion of the screen is fixed, and the reset bar configured to be detachable from the fixed bar and to be separated from the shielding material. Shielding device. The torque limiter is
A transmission member that rotates integrally with the drive shaft;
A shaft member that rotates integrally with the winding shaft;
The frictional force generating member that rotates the transmission member and the shaft member integrally with each other by a frictional force, and causes the shaft member to idle with respect to the transmission member with the predetermined torque or more. The shielding apparatus of Claim 1. The winding shaft is a first winding shaft, and one end of the lifting cord is wound on the first winding shaft,
10. The shielding device according to claim 1, wherein the other end portion of the elevating cord is wound around a second winding shaft, and the torque limiter is disposed on the second winding shaft. The shielding apparatus according to claim 10, wherein the second winding shaft winds up an extra winding of the lifting cord. A take-up shaft that winds up and down the lifting and lowering cord for raising and lowering the shielding material;
An input portion provided on the winding shaft portion and connected to a drive shaft that rotates the winding shaft portion;
A winding device configured such that the winding shaft portion and the input portion rotate relative to each other with a predetermined torque or more. A shielding material supported from above;
An elevating cord for elevating and lowering the shielding material by elevating and lowering a lower end portion of the shielding material;
A first winding shaft that is connected to one end of the lifting cord and is wound around the one end by being rotated by a drive shaft;
A second winding shaft that is connected to the other end of the lifting cord and winds up the other end;
A torque limiter attached to the second winding shaft,
The shielding apparatus, wherein the second winding shaft is rotatable relative to the head box. A shielding material supported from above;
A plurality of lifting cords for lifting and lowering the shielding material by raising and lowering the lower end of the shielding material;
A winding shaft for winding the lifting cord;
And N (N is an integer of 2 or more) torque limiters provided one for each winding shaft,
The load of the suspended body including the shielding material when the lower end portion of the shielding material is at the upper limit position is the maximum load,
The operating torque of each of the torque limiters is set to be equal to or lower than the maximum load, and the sum of the operating loads of the N−1 torque limiters is equal to or higher than the maximum load.