JP4777231B2 - Blind obstacle stop device - Google Patents

Description

  The present invention relates to a blind failure stop device.

  2. Description of the Related Art Conventionally, as this kind of blind failure stop device, one disclosed in Patent Document 1 is known.

  In the obstacle stopping device described in Patent Document 1, when the tension in the pull-out direction does not act on the lifting / lowering cord, the obstacle detection unit that prevents the winding pulley that supports the lifting / lowering cord from rotating, and the action of the obstacle detection unit And stopping means for preventing the rotation of the drive shaft based on the relative rotation between the winding pulley and the drive shaft.

  The stop means is inserted into the end of the take-up pulley so as not to rotate relative to the take-up pulley, and includes a cam clutch having a sliding hole inclined with respect to the take-up pulley axis, and the take-up pulley. A rotating drum that includes a sliding projection that is incapable of relative movement in the axial direction and that slides inside the sliding hole, and is relatively rotatable and axially movable within a predetermined range with respect to the cam clutch. It consists of and.

JP 2005-179994 A

  However, in the apparatus of Patent Document 1, the assembly work is performed in the take-up pulley by inserting the sliding projection of the rotary drum into the sliding hole of the cam clutch, and the assembly work is complicated and maintenance is required. There is a problem that the nature is not enough.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a blind failure stop device that can be easily assembled and can be easily maintained.

In order to achieve the above-described object, according to the first aspect of the present invention, one end of a lifting / lowering cord that supports a shielding material is connected to a winding drum that is rotatably supported in a head box, and a rotary drive shaft is operated by an operating means. The winding drum rotates and winds the lifting / lowering cord by rotating in the shielding material rising direction, and the winding drum rotates and unwinds the lifting / lowering cord by the tension of the lifting / lowering cord based on the operation of the operating means. In the blind, the blind stopping device for stopping the rotation of the rotary drive shaft when the shielding material comes into contact with the obstacle and the tension of the lifting / lowering cord is released,
A cam cylinder that rotates integrally with the rotation drive shaft is provided, and a guide hole is formed in the peripheral surface of the winding drum, the guide hole extending in an axial direction from one end to the other end, and a cam groove portion made from the return groove portion extending from one end to the other end as one end direction perpendicular to the axial direction to the other end, the the cam barrel is formed convex portion inserted into draft bore, the winding drum and the cam cylinder The convex portion moves through the guide hole in accordance with the relative rotation generated between the cam cylinder, and the cam cylinder is movable in the axial direction with respect to the winding drum between the rotatable position and the non-rotatable position. The protrusion moves relative to the cam groove of the guide hole so that the cam barrel moves to the non-rotatable position due to the relative rotation between the winding drum and the cam barrel that occurs when the tension of the lifting / lowering cord is released. The take-up drum and cam cylinder that are generated when the tension of the lifting cord is restored. The relative rotation between, the convex portion so as to hold the cam cylinder nonrotatably position, characterized in that relative movement in the return groove of the guide hole.

According to a second aspect of the present invention, in the first aspect of the present invention, the convex portion has a return groove portion from one end by the relative rotation between the winding drum and the cam cylinder generated when the tension of the lifting / lowering cord is restored. When the convex portion reaches the other end of the return groove by relative movement to the other end, the winding drum is prevented from rotating.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the convex portion is returned from the return groove portion to one end of the cam groove portion by the rotation of the rotary drive shaft in the shielding material raising direction. .

  According to the present invention, a guide hole is formed in the winding drum, and a convex portion to be inserted into the guide hole is formed in the cam cylinder, and the guide hole and the convex portion can be visually recognized from the outside of the winding drum. Therefore, the assembling work and the maintenance work become easy, and the assembling property and the maintainability can be improved.

  Further, the relative rotation between the take-up drum and the cam barrel that occurs when the tension of the lifting / lowering cord is restored causes the convex portion to relatively move within the guide hole so as to hold the cam barrel in the non-rotatable position. When the obstacle is removed and the tension of the lifting / lowering cord is restored, the shielding material can be kept in a stopped state without immediately starting to descend.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an example of a blind to which the blind failure stop device of the present invention is applied. In this example, the blind 10 is a pleated screen. However, the present invention is not limited thereto, and the shielding material is raised against its own weight, such as a horizontal blind or a roman shade, and the shielding material is lowered by its own weight. Can be applied to any blind that can.

  The blind 10 includes a head box 12 that is attached to a fixed part such as a window frame by a bracket 11, and a screen 14 on which a plurality of ridges that are shielding materials are continuously formed in the vertical direction can be raised and lowered from the head box 12. It is suspended. A bottom rail 16 is provided at the lower end of the screen 14.

  A plurality of elevating cords 18, 18 are suspended from the head box 12, and the lower end of the elevating cord 18 is attached to the bottom rail 16. In addition, the upper end of the lifting / lowering cord 18 is introduced into the head box 12 and connected to a winding drum 20 disposed in the head box 12 so as to be wound and unwound. Each take-up drum 20 is rotatably supported with respect to a drum receiver 28 fixed in the head box 12, and a rotary drive shaft that is rotatably supported in the take-up drum 20 within the head box 12. 22 penetrates. The rotation of the rotary drive shaft 22 is permitted / blocked by a stopper 23 disposed in the head box 12.

  An operation unit 24 is provided at one end of the head box. The operation unit 24 includes a control unit 25 and an endless ball chain 26 that hangs down from the control unit 25. When one of the ball chains 26 suspended from the control unit 25 is continuously pulled in a certain direction, the rotation drive shaft 22 rotates in the screen ascending direction, and the rotation is transmitted to the winding drum 20 so that the winding drum 20 In order to wind up the lifting cord 18, the screen 14 is raised. When the operation of the operation unit 24 is stopped, the rotation of the rotary drive shaft 22 is blocked by the stopper 23, so that the screen 14 can maintain its height position. Further, when one of the ball chains 26 suspended from the control unit 25 is slightly pulled, the stopper 23 is released, so that the rotation drive shaft 22 can freely rotate. Then, the rotary drum 20 rotates in the screen lowering direction by the tension of the lifting / lowering cord 18 on which the gravity of the bottom rail 16 and the screen 14 acts, and the lifting / lowering cord 18 is unwound from the winding drum 20, so that the screen 14 is lowered. To do.

  If the bottom rail 16 or the like comes into contact with an obstacle while the screen 14 is descending, the part that is in contact with the obstacle cannot be lowered, but the other parts that are not in contact with the obstacle continue to descend. The rail 16 may be lowered. In order to prevent such a one-sided fall, the failure stop device 30 of the present invention is provided between each winding drum 20 and the rotary drive shaft 22.

  As shown in FIG. 2, the failure stopping device 30 includes a guide hole 20 d formed in a cylindrical portion 20 c provided at an end portion of the winding drum 20, an input shaft 32, a cam cylinder 34, and a drum receiver 28. It is comprised from the formed convex part 28a (refer FIG. 3). Hereinafter, each member will be described in detail.

  As shown in FIGS. 2 and 3, the take-up drum 20 includes a drum body 20a around which the elevating cord 18 is wound, a drum cap 20b that is detachably fitted to one end of the drum body 20a, and a drum body 20a. And a cylindrical portion 20c that extends to the other end of the.

  As shown in FIG. 5, the guide hole 20d formed in the cylindrical portion 20c includes a cam groove portion 20e extending from one end to the other end in an inclined manner with respect to the axial direction of the take-up drum 20, and the other end of the cam groove portion 20e. And a return groove portion 20f extending in a direction orthogonal to the axial direction from the one end to the other end.

  Further, an inner cylinder portion 20g (see FIG. 3) is formed concentrically with the drum body portion 20a inside the winding drum 20, and ribs 20h (FIG. 4) are spaced apart from the guide holes 20d in the circumferential direction. Reference) is formed.

  The input shaft 32 is disposed between the rotary drive shaft 22 penetrating the winding drum 20 and the inner cylinder portion 20g.

  The cross-sectional shape of the center hole of the input shaft 32 matches the non-circular cross-sectional shape of the rotary drive shaft 22, so that the input shaft 32 rotates integrally with the rotary drive shaft 22. Further, a plurality of elastic pieces 32 b are extended from the end of the input shaft 32 so as to be spaced apart from each other in the circumferential direction. The elastic piece 32b can be elastically displaced in the radial direction, and an engagement protrusion 32c is formed at an end thereof. Further, a flange portion 32d protruding in the outer diameter direction is formed at the center portion of the input shaft 32, and both end portions of the inner cylindrical portion 20g of the winding drum 20 are formed by the flange portion 32d and the engagement protrusion 32c. By sandwiching, the input shaft 32 cannot move in the axial direction in the winding drum 20. Further, a pair of ribs 32 e protruding in the outer diameter direction are formed on the outer peripheral surface of the input shaft 32.

  The cam cylinder 34 is disposed between the input shaft 32 and the cylindrical portion 20 c of the winding drum 20. A groove 34a (FIG. 4) for fitting with the rib 32e of the input shaft 32 is formed on the inner peripheral surface of the cam barrel 34. By fitting the rib 32e with the groove 34a, the cam barrel 34 is connected to the input shaft 32. 32 and the rotary drive shaft 22 are integrally rotated.

  Further, a convex portion 34 b protruding in the outer diameter direction is formed on the outer peripheral surface of the cam cylinder 34. A U-shaped slit 34c is formed around the convex portion 34b. The presence of the slit 34c allows the convex portion 34b to be elastically displaced in the radial direction. A concave portion 34f is formed at a position spaced apart from the convex portion 34b of the cam cylinder 34 in the circumferential direction. Further, a claw 34d formed in a sawtooth shape is provided on the outer peripheral surface of the cam cylinder 34, and a bearing portion 34e extends in the axial direction from a portion where the claw 34d is formed.

  The convex part 34b of the cam cylinder 34 is inserted into the guide hole 20d of the winding pipe 20, and the rib 20h of the winding pipe 20 is inserted into the concave part 34f of the cam cylinder 34, whereby the cam cylinder 34 and the winding pipe 20 are Relative rotation is possible within a predetermined angle range, and relative movement in the axial direction is possible within a predetermined range.

  To assemble the winding drum 20, the input shaft 32, and the cam cylinder 34, the input shaft 32 is inserted from the end of the winding drum 20. At this time, the elastic piece 32b of the input shaft 32 is displaced in the inner diameter direction, so that the engagement protrusion 32c can be engaged with the end of the inner cylinder part 20g through the inner cylinder part 20g of the winding drum 20. The inner cylindrical portion 20g can be sandwiched between the flange portion 32d and the engaging projection 32c.

  Then, the cam cylinder 34 is further inserted. When the convex part 34b of the cam cylinder 34 is displaced in the inner diameter direction, the cylindrical part 20c of the winding drum 20 is inserted into the guide hole 20d. Since the guide hole 20d is formed in the winding drum 20, and the guide hole 20d can be visually recognized from the outside at the time of assembly, the operation of inserting the convex portion 34b into the guide hole 20d can be easily performed. Further, when the parts are disassembled for maintenance or the like after assembly, the guide hole 20d and the convex portion 34b are visible from the outside, so that the convex portion 34b is removed from the guide hole 20d while being pushed in the inner diameter direction. This makes it easy to work.

  As shown in FIG. 3, the drum receiver 28 rotatably supports the assembly of the winding drum 20, the input shaft 32, and the cam cylinder 34 assembled as described above. Specifically, Both end portions of the drum receiver 28 support the bearing portion formed on the drum cap 20b and the bearing portion 34e of the cam cylinder 34, respectively. A part of the drum receiver 28 fits into an annular groove between the drum body 20 a and the cylindrical part 20 c of the winding drum 20 so that the winding drum 20 cannot move relative to the drum receiver 28 in the axial direction. On the other hand, the cam cylinder 34 is movable relative to the drum receiver 28 in the axial direction.

  At one end of the drum receiver 28, the convex portion 28a that faces the claw 34d of the cam cylinder 34 and can be engaged with the claw 34d is formed. When the cam cylinder 34 approaches the convex portion 28a and the claw 34d engages with the convex portion 28a, the cam cylinder 34 cannot rotate, and is separated from the convex portion 28a so that the claw 34d and the convex portion 28a are not engaged. Sometimes it is rotatable and moves axially between this rotatable position and a non-rotatable position. Normally, the cam cylinder 34 is in a rotatable position, with the claw 34d and the projection 28a being separated in the axial direction.

The operation of the failure stopping device 30 configured as described above will be described.
When the screen 14 is raised, the rotary drive shaft 22 is rotated in the screen raising direction by the operation of the operation unit 24. The rotation of the rotary drive shaft 22 is transmitted from the input shaft 32 to the cam barrel 34. At this time, as shown in FIG. 5 (a), the convex portion 34b of the cam barrel 34 is located at one end of the cam groove portion 20e of the guide hole 20d, and as shown in FIG. 4, the end face of the concave portion 34f of the cam barrel 34 is provided. Is in contact with the rib 20h of the winding drum 20 and rotates the winding drum 20 in the same direction. As a result, the lifting / lowering cord 18 is wound around the drum body 20a of the winding drum 20, and the screen 14 is raised.

  When the operation of the operation unit 24 is stopped, the winding drum 20 tries to move in the downward direction due to the tension of the lifting / lowering cord 18, but the rotation of the rotary drive shaft 22 is blocked by the stopper 23. Since the rotation is prevented, the projection 34b and / or the recess 34f prevents the winding drum 20 from rotating, and the winding drum 20 does not rotate. Therefore, the height of the screen 14 is maintained.

  On the contrary, when the screen 14 is lowered, the rotary drive shaft 22 is released from the stopper 23 by the operation of the operation unit 24 as described above, and can freely rotate. As a result, the winding drum 20 is rotated in the screen lowering direction by the tension of the lifting / lowering cord 18, and the guide hole 20d pushes the convex portion 34b of the cam barrel 34 in the same direction as shown in FIG. The rib 20h of the take-up drum 20 pushes the end face of the recess 34f of the cam cylinder 34 in the same direction, whereby the rotary drive shaft 22 also rotates in the same direction via the input shaft 32.

  If the bottom rail 16 or the like comes into contact with an obstacle while the screen 14 is descending, the tension is not applied to the lifting / lowering cord 18, and the winding drum 20 that has been rotating in the descending direction is rubbed from a member that contacts the winding drum 20. The rotation is stopped by force. However, since the other winding drum 20 attached to the lifting / lowering cord 18 on which the tension acts without being affected by the obstacle continues to rotate, the rotation drive shaft 22, the input shaft 32, and the cam barrel 34 try to continue rotating. Then, relative rotation occurs between the winding drum 20 that has stopped rotating and the cam barrel 34, and the convex portion 34b of the cam barrel 34 moves along the cam groove 20e of the guide hole 20d. The end is reached (FIGS. 5B and 3B). The cam cylinder 34 is moved in the axial direction by the movement of the convex portion 34 b, and the claw 34 d is locked to the convex portion 28 a of the drum 28. Thus, since the rotation of the cam cylinder 34 is prohibited, the rotation of the rotary drive shaft 22 is also prevented. Therefore, the other winding drum 20 attached to the lifting / lowering cord 18 on which the tension acts without being affected by the obstacle is also prevented from rotating, and the bottom rail 16 can be prevented from falling down.

  When the obstacle is removed and the tension due to the gravity of the bottom rail 16 and the screen 14 is restored to the lifting / lowering cord 18, the winding drum 20 tries to rotate in the screen lowering direction, but the cam cylinder 34 is locked to the convex portion 28a. Therefore, since it cannot rotate in the screen lowering direction, relative rotation occurs between the winding drum 20 and the cam barrel 34, and the convex portion 34b of the cam barrel 34 is formed in the return groove portion 20f of the guide hole 20d. Relative movement along the axis reaches the other end of the return groove 20f (FIG. 5C) and FIG. 3C. The other end of the return groove portion 20f serves as a locking portion, and the convex portion 34b of the cam cylinder 34 prevents the winding drum 20 from rotating in the screen lowering direction. As a result, the screen 14 can be kept stopped. .

  When the operation unit 24 is operated to rotate the rotary drive shaft 22 in the screen ascending direction, the cam cylinder 34 rotates from the rotary drive shaft 22 via the input shaft 32 in the screen ascending direction. The cam cylinder 34 moves in the axial direction while the inclined surface of the serrated claw 34d of the cam cylinder 34 is in contact with the convex portion 28a of the drum receiver 28 (FIG. 5D). Thereby, the convex part 34b of the cam cylinder 34 returns to one end of the cam groove part 20e of the guide hole 20d of the winding drum 20 (FIG. 5A). When the operation of the operation unit 24 is released, the rotation drive shaft 22 becomes free to rotate, and the take-up drum 20 is rotated in the screen lowering direction by the lifting / lowering cord 18 whose tension has been restored, so that it can be returned to the lowering operation.

  As described above, in the present invention, the screen is stopped by the return groove portion 20f of the guide hole 20d and the locking portion at the other end of the return groove portion 20f without stopping the screen immediately after the obstacle is removed. Can be held.

It is a front view showing an example of a blind to which a failure stopping device for a blind according to the present invention is applied. (A) is a disassembled perspective view of the failure stopping device for a blind according to the present invention, and (b) is a perspective view after assembly. It is sectional drawing of the obstacle stop device of the blind of this invention, (a) is normal time, (b) is the time of a failure occurrence, (c) represents after obstacle removal. It is sectional drawing seen along line 4-4 of Fig.3 (a). (A) of the obstacle stopping device for a blind according to the present invention is a partial plan view in a normal state, (b) is a partial plan view at the time of occurrence of a failure, (c) is a partial plan view after removing an obstacle, ) Are a partial plan view and a partial bottom view during return.

Explanation of symbols

10 Blind 12 Head box 14 Screen (shielding material)
18 Lift Code 20 Winding Drum 20d Guide Hole 20e Cam Groove 20f Return Groove 22 Rotation Drive Shaft 24 Operation Unit (Operation Unit)
30 Fault stop device 34 Cam cylinder 34b Convex part

Claims (3)

One end of a lifting / lowering cord (18) that supports the shielding member (14) is connected to a winding drum (20) that is rotatably supported in the head box (12), and a rotary drive shaft (22) is operated by an operating means (24). ) Rotates in the upward direction of the shielding material, the winding drum (20) rotates to wind up the lifting / lowering cord (18), and the winding drum is driven by the tension of the lifting / lowering cord (18) based on the operation of the operating means (24). In the blind (10) in which (20) rotates and unwinds the lifting / lowering cord (18), when the shielding material (14) contacts the obstacle and the tension of the lifting / lowering cord (18) is released. In the blind stop device for stopping the rotation of the rotary drive shaft (22),
A cam cylinder (34) that rotates integrally with the rotation drive shaft (22) is provided, and a guide hole (20d) is formed on the peripheral surface of the winding drum (20), and the guide hole (20d) extends from one end to the other end. The cam groove (20e) extending in the axial direction up to the axial direction, and the return groove (20f) extending in the direction perpendicular to the axial direction from one end to the other end with the other end of the cam groove (20e) as one end. the tube (34) protruding portion to be inserted into draft bore (20d) (34b) is formed, a convex portion in accordance with the relative rotation generated between the winding drum (20) cam cylinder (34) (34b) moves in the guide hole (20d), and the cam cylinder (34) is movable in the axial direction with respect to the winding drum (20) between a rotatable position and a non-rotatable position. Winding drum (20) generated when tension of lifting cord (18) is released The relative rotation between the cam barrel (34), the convex portion so as to move the cam cylinder (34) to the non-rotatable position (34b) is relatively moved in the cam groove of the guide hole (20d) (20e) By the relative rotation between the winding drum (20) and the cam cylinder (34) generated when the tension of the lifting / lowering cord (18) is restored, the cam cylinder (34) is projected so as to be held at the non-rotatable position. The blind stop stopping device characterized in that the portion (34b) relatively moves in the return groove (20f) of the guide hole (20d).   Due to the relative rotation between the winding drum (20) and the cam barrel (34) that occurs when the tension of the lifting / lowering cord (18) is restored, the convex portion (34b) has a return groove (20f) from one end to the other. The winding drum (20) is prevented from rotating when the convex portion (34b) reaches the other end of the return groove portion (20f) by relative movement to the end. Blind fault stop device. The said convex part (34b) returns to the end of a cam groove part (20e) from the return groove part (20f) by rotation of the shielding material raising direction of the said rotational drive shaft (22), The Claim 1 or 2 characterized by the above-mentioned. Blind obstacle stop device.

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