JP3570926B2 - Roll blind lifting device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a screen lifting and lowering device for a roll blind.
[0002]
[Prior art]
Conventionally, as one type of an elevating device for elevating and lowering a screen of a roll blind, a winding shaft for winding the screen is rotatably supported between a pair of support brackets, and a pulley is rotatably supported on one of the support brackets, Some pulleys are provided with an operation code, and by operating the operation code, the winding shaft is driven to rotate so that the screen can be moved up and down.
[0003]
Various proposals have been made for such a screen raising and lowering device of a roll blind in order to easily perform a screen pulling operation.
Japanese Patent No. 2656147 discloses that the screen is pulled up by using a biasing force of a torsion coil spring disposed in the winding shaft by slightly pulling the operation code in a direction opposite to the screen pulling down direction. A possible lifting device is disclosed.
[0004]
Further, Japanese Patent No. 2860230 discloses a lifting / lowering device in which after slightly pulling an operation code in a direction opposite to a screen lowering direction, the screen can be pulled up even if the operation code is released.
[0005]
[Problems to be solved by the invention]
In the elevating device described in Japanese Patent No. 2656147, when the screen is pulled up to the upper limit, the operation code needs to be kept slightly pulled until the screen reaches the upper limit, so that the operation is still complicated. .
[0006]
In the lifting device described in Japanese Patent No. 2860230, rotation of the pulley in the screen pulling direction is prevented during the screen pulling operation. Therefore, if the operation cord is strongly pulled downward during the screen pulling operation, the clutch device for transmitting the rotational force of the pulley to the winding shaft may be damaged.
[0007]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a roll blind lifting and lowering device capable of easily performing a screen pulling-up operation and preventing damage due to unnecessary operation of an operation code.
[0008]
[Means for Solving the Problems]
According to the first aspect, both ends of a take-up shaft that suspends and supports the screen are rotatably supported by a support bracket, an operation code is hung from a pulley provided on the one support bracket, and the pulley is rotated by the operation code. In this way, the winding shaft is rotated via a clutch device so that the screen can be moved up and down, and biasing means for applying a rotational force to the winding shaft in a screen pulling direction is provided in the winding shaft. Transmits the rotation of the pulley based on the operation of the operation code in the screen lowering direction to the winding shaft, and after the screen lowering operation, prevents the rotation of the winding shaft due to the rotational force of the urging means. The winding shaft can be rotated in the screen pulling direction based on the rotational force of the urging means by the rotation of the pulley based on the operation of the screen pulling direction In the lifting device of the roller blind that, the clutch device, the take-up shaft and the clutch case that rotates integrally, the pulley connected integrally rotatably with the clutch case on the basis of the rotation of the screen cuts direction of the pulley An internal device that enables the pulley to freely rotate with respect to the clutch case based on the rotation of the pulley in the screen pulling direction. The internal device includes a first clutch surface formed in the clutch case, a clutch slider that moves in an axial direction based on rotation of the pulley, and an integral unit with the pulley. And a second clutch capable of engaging with the first clutch surface. Surface of the pulley, the second clutch surface is engaged with the first clutch surface based on the operation of the clutch slider that moves in the axial direction based on the rotation of the pulley in the screen pulling direction, and the screen of the pulley A clutch member that moves in a direction to release the engagement between the first clutch surface and the second clutch surface based on the operation of the clutch slider that moves in the axial direction based on the rotation in the pulling direction. Was.
[0011]
According to claim 2, wherein the first and second clutch surface was composed of clutch teeth which enables meshing with each other.
According to a third aspect of the present invention, an engagement means is provided between the pulley and the clutch slider to engage with each other with a rotational torque of a predetermined value or less when the engagement of the first and second clutch surfaces is released. Was.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. In the roll blind shown in FIG. 1, support brackets 2a and 2b are attached to both ends of a mounting frame 1, and a winding shaft 3 is rotatably supported between the support brackets 2a and 2b. Then, the mounting frame 1 is mounted on an upper frame of a window or the like via a mounting bracket (not shown).
[0013]
A screen 4 hangs from the winding shaft 3, and a weight bar (not shown) is attached to a lower end of the screen 4. Then, the screen 4 is moved up and down based on the rotation of the winding shaft 3.
[0014]
In the winding shaft 3, a spring motor (not shown) constituted by a torsion coil spring is disposed on the one support bracket 2a side. One end of the spring motor is non-rotatably supported by the support bracket 2a, and the other end is fixed to the winding shaft 3.
[0015]
The spring motor is charged based on the rotation of the winding shaft 3 in the screen pulling-down direction, and the screen 4 can be pulled up based on the stored power.
As shown in FIG. 2, a pulley 5 is rotatably supported by the other support bracket 2b, and an operation cord 6 in the form of a ball chain is mounted on the pulley 5. When the pulley 5 is rotated by operating the operation cord 6, the winding shaft 3 is rotated via the clutch device 7.
[0016]
The specific configuration of the clutch device 7 will be described with reference to FIGS. 2 to 4. The pulley 5 is rotatably supported on a shaft 8 provided on the support bracket 2 b on the outer peripheral surface thereof.
[0017]
A square hole is formed in the center of the shaft 8, and the base end of the support shaft 9 is fitted into the square hole. That is, the base end of the support shaft 9 is formed in a square shaft shape, the base end of the support shaft 9 is inserted into the square hole, and the screw 10 is screwed from the outside of the support bracket 2b. Therefore, the support shaft 9 is fixed to the support bracket 2b so as not to rotate and not to move in the axial direction.
[0018]
The portion from the intermediate portion to the tip portion of the support shaft 9 is formed in a bale-shaped cross section in which the diameter is reduced in three stages and both side surfaces of each portion are cut off.
At the tip of the pulley 5, locking pieces 11a and 11b are formed at positions substantially symmetrical with respect to the center of the pulley 5, and the clutch ball 12 is supported on the inner peripheral surface of one of the locking pieces 11b. A locking groove 13 having a semicircular cross section for supporting the shaft 9 so as to be movable in a predetermined range in the axial direction is formed.
[0019]
As shown in FIG. 7, an engaging groove 14 is formed on the outer peripheral surface of the locking piece 11b along the axial direction of the support shaft 9.
Inside the engaging pieces 11a and 11b of the pulley 5, a clutch slider 15 is supported at an intermediate portion of the support shaft 9 so as to be non-rotatable and movable in the axial direction.
[0020]
A flange 16 is formed at an intermediate portion in the axial direction of the clutch slider 15, and the clutch ball 12 is guided in a circumferential direction on an outer peripheral surface between a base end of the clutch slider 15 and the flange 16. A guide groove 17 having a semicircular cross section is formed.
[0021]
When the clutch ball 12 is supported between the guide groove 17 and the locking groove 13 and the pulley 5 is rotated, the clutch ball 12 moves on the outer circumferential surface of the clutch slider 15 to the guide groove 17. While moving in the circumferential direction along the lock groove 13 in the axial direction.
[0022]
As shown in FIGS. 11 and 12, the guide groove 17 has a first groove 17a formed in the circumferential direction on the base end side of the clutch slider 15, and a second groove formed in the circumferential direction on the flange side. 17b and a communication groove 17c for connecting the first and second grooves 17a and 17b.
[0023]
When the pulley 5 is rotated in the screen lowering direction, the clutch ball 12 moves in the arrow B direction in the first groove 17a, and when the pulley 5 is rotated in the screen pulling direction, the clutch ball 12 is moved to the second direction. Move in the direction of arrow A in the groove 17b.
[0024]
When the pulley 5 is rotated in the screen pulling direction from the state in which the clutch ball 12 is located in the first groove 17a, the clutch ball 12 moves in the arrow A direction in the first groove 17a, and then communicates. It moves into the second groove 17b via the groove 17c.
[0025]
When the pulley 5 is rotated in the screen lowering direction from the state in which the clutch ball 12 is located in the second groove 17b, the clutch ball 12 moves in the arrow B direction in the second groove 17b and then communicates. It moves into the first groove 17a via the groove 17c.
[0026]
The length of the locking groove 13 is such that when the clutch ball 12 moves in the first groove 17a or the second groove 17b, the first and second grooves 17a, 17b and the communication groove 17c join. The bent portion 17d formed in the portion is formed to have a length that allows clearing.
[0027]
Also, when the clutch ball 12 moves between the first groove 17a and the second groove 17b, the clutch slider 15 and the clutch ball 12 move beyond the range of movement of the clutch ball 12 by the locking groove 13. In order to relatively move in the direction, the clutch slider 15 moves in the axial direction as shown in FIGS.
[0028]
The distal end of the clutch slider 15 penetrates the coil spring 18 and the arm 19 and is fitted in a fitting hole 21 formed in the center of the clutch member 20.
[0029]
The arm 19 is formed in a cylindrical shape through which the base end of the clutch slider 15 can be inserted, and the locking piece 19a formed on the base end thereof is connected to the pulley 5 as shown in FIGS. Are inserted in the engagement grooves 14.
[0030]
Therefore, the arm 19 is rotated integrally with the pulley 5 and is supported movably in the axial direction with respect to the pulley 5.
The coil spring 18 is disposed between the flange 16 of the clutch slider 15 and the inner surface of the distal end of the arm 19, and biases the arm 19 toward the clutch member 20 with the flange 16 as a fulcrum. are doing.
[0031]
A latch 22 is formed at the tip of the clutch slider 15, and the latch 22 is engaged with the tip surface of the clutch member 20 to set the maximum separation distance between the clutch slider 15 and the clutch member 20. I have. Therefore, the clutch member 20 is always urged by the urging force of the coil spring 18 so as to be positioned at the maximum separation distance with respect to the clutch slider 15.
[0032]
When the clutch slider 15 moves in the axial direction, the arm 19 and the clutch member 20 move in the axial direction integrally with the clutch slider 15.
[0033]
An engagement surface facing the distal end surface of the arm 19 is formed at a base end of the clutch member 20, and an engagement protrusion 23 projecting toward the arm 19 is formed on the engagement surface. I have.
[0034]
As shown in FIG. 6, an engagement recess 23b that engages with the engagement protrusion 23 when the arm 19 is rotated in the screen lowering direction is formed on the distal end surface of the arm 19. Therefore, when the arm 19 is rotated in the screen lowering direction, the clutch member 20 is rotated integrally with the arm 19.
[0035]
An axially protruding clutch tooth 24 is formed on the outer periphery of the distal end of the clutch member 20.
A spring pulley 25 is rotatably supported on the support shaft 9 on the distal end side of the clutch member 20, and clutch teeth 26 capable of meshing with the clutch teeth 24 are formed on the proximal end side of the spring pulley 25. ing.
[0036]
On the distal end side of the spring pulley 25, a drum 27 is non-rotatably fitted to the support shaft 9, and a torsion coil spring 28 is mounted on the outer peripheral surface of the drum 27.
[0037]
The end of the torsion coil spring 28 on the side of the spring pulley 25 is bent so as to protrude in the axial direction of the support shaft 9 to form an engagement end 29. As shown in FIG. 29 is fitted on the distal end surface of the spring pulley 25.
[0038]
When the spring pulley 25 is rotated in the screen pulling-down direction, the frictional force between the torsion coil spring 28 and the drum 27 is reduced, and the torsion coil spring 28 rotates together with the spring pulley 25, and the spring pulley 25 Is rotated in the screen pulling-up direction, the frictional force between the torsion coil spring 28 and the drum 27 increases, and the rotation of the spring pulley 25 is prevented.
[0039]
The spring pulley 25, the torsion coil spring 28, and the drum 27 are housed in a substantially cylindrical clutch case 30, and the base end of the case 30 is extended to a position covering the distal end of the pulley 5. ing.
[0040]
Around the spring pulley 25, clutch teeth 31 are formed on the inner peripheral surface of the clutch case 30 so as to overlap the clutch teeth 26 of the spring pulley 25, and the clutch teeth 24 of the clutch member 20 are connected to the clutch teeth of the spring pulley 25. When meshing with the clutch 26, the clutch teeth 31 of the clutch case 30 are meshed at the same time.
[0041]
Accordingly, when the clutch member 20 is rotated in the screen descending direction in a state where the clutch teeth 24 of the clutch member 20 are engaged with the spring pulley 25 and the clutch teeth 26 and 31 of the clutch case 30, the spring pulley 25 and the clutch case 30 is rotated integrally.
[0042]
The winding shaft 3 is fitted on the outer peripheral surface of the clutch case 30, so that the clutch case 30 and the winding shaft 3 rotate integrally.
A rotary damper 32 is housed at the tip of the clutch case 30, and an input shaft 33 of the rotary damper 32 is non-rotatably fitted to a tip of the support shaft 9, and a damper case 34 is attached to the clutch case 30. It is fitted.
[0043]
The rotary damper 32 is constituted by a direct-acting oil damper that generates a greater braking force as the rotation speed input to the input shaft 33 increases, and operates so as to suppress the rotation speed of the winding shaft 3 to a certain speed or less. I do.
[0044]
Next, the operation of the roll blind configured as described above will be described.
When the operation code 6 is operated in the screen lowering direction after the screen 4 is lifted, the clutch ball 12 is moved from the state in which the clutch ball 12 is in the second groove 17b of the clutch slider 15 to the arrow B as shown in FIG. Move in the direction.
[0045]
Then, as shown in FIGS. 12B to 12F, the clutch ball 12 moves from the second groove 17b to the first groove 17a via the communication groove 17c, and moves into the first groove 17a. To move.
[0046]
At this time, as the clutch ball 12 moves from the second groove 17b to the first groove 17a, the clutch slider 15 moves in the axial direction, and the arm 19 and the clutch member 20 move in the axial direction together with the clutch slider 15. 8 to FIG. 10 to the state shown in FIG. 5 to FIG. 7, the clutch teeth 24 of the clutch member 20 mesh with the spring pulley 25 and the clutch teeth 26 and 31 of the clutch case 30.
[0047]
In this state, the arm 19 is rotated by the rotation of the pulley 5, the clutch member 20 is rotated with the rotation of the arm 19, the spring pulley 25 and the clutch case 30 are rotated with the rotation of the clutch member 20, and the winding is performed. The shaft 3 is rotated in the screen descending direction.
[0048]
As a result, the screen 4 is lowered by continuing the operation of pulling out the operation code 6 in the screen lowering direction, and the spring motor in the winding shaft 3 is charged.
[0049]
When the operation code 6 is released after the screen 4 has been lowered to the desired position, a rotational force in the screen pulling direction acts on the winding shaft 3 by the urging force of the spring motor.
[0050]
Then, the rotational force is transmitted from the clutch case 30 to the spring pulley 25 via the clutch member 20. When a rotational force in the screen pulling direction acts on the spring pulley 25, the frictional force between the torsion coil spring 28 and the drum 27 increases, and the rotation of the spring pulley 25 is prevented.
[0051]
Therefore, when the operation cord 6 is released, the screen 4 is suspended and supported at a desired position.
When the operation code 6 is pulled in the opposite direction to the case of the screen lowering operation in order to pull up the screen 4, as shown in FIG. 17a is moved in the direction of arrow A.
[0052]
Then, as shown in FIGS. 11B to 11F, the clutch ball 12 is guided from the communication groove 17c into the second groove 17b, and enters a state of moving in the second groove 17b.
[0053]
At this time, as the clutch ball 12 moves from the first groove 17a to the second groove 17b, the clutch slider 15 moves in the axial direction, and the arm 19 and the clutch member 20 move in the axial direction together with the clutch slider 15. 8 to 10 from the state shown in FIGS. 5 to 7, the clutch teeth 24 of the clutch member 20 are disengaged from the spring pulley 25 and the clutch teeth 26 and 31 of the clutch case 30. .
[0054]
In this state, when a rotational force in the screen pulling-up direction is applied to the winding shaft 3 by the urging force of the spring motor, the rotational force is not transmitted to the clutch member 20 and is not transmitted to the spring pulley 25.
[0055]
Therefore, the winding shaft 3 is rotated by the urging force of the spring motor, and the screen 4 is pulled up. This state is maintained even if the operation code 6 is released.
Further, when the operation code 6 is further lowered in the same direction during the pulling operation of the screen 4, the clutch ball 12 orbits in the second groove 17 b, and the clutch member 20 meshes with the spring pulley 25 and the clutch case 30. Since the wheel spins without fitting, it does not affect the pulling operation of the screen 4 at all.
[0056]
When stopping the raising operation of the screen 4, when the operation code 6 is operated in the screen lowering direction, the clutch ball 12 moves from the second groove 17 b into the first groove 17 a based on the rotation of the pulley 5, The clutch slider 15 and the clutch member 20 move in the axial direction, and the clutch member 20 meshes with the spring pulley 25 and the clutch case 30.
[0057]
As a result, the frictional force between the torsion coil spring 28 and the drum 27 increases, and the lifting operation of the screen 4 is stopped.
With the roll blind lifting / lowering device configured as described above, the following operational effects can be obtained.
[0058]
(1) If the operation code 6 is pulled out in the screen lowering direction, the screen 4 can be lowered by rotating the winding shaft 3 in the screen lowering direction.
(2) If the operation code 6 is slightly pulled out in the screen pulling direction and the meshing of the clutch member 20 with the spring pulley 25 and the clutch case 30 is released, the screen 4 can be pulled up by the biasing force of the spring motor. .
[0059]
(3) If the lifting operation of the screen 4 is started, the lifting operation of the screen 4 can be continued even if the operation code 6 is released.
(4) Even if the operation code 6 is continuously operated in the screen pulling direction during the pulling operation of the screen 4, the pulley 5 and the clutch member 20 idle, so that the screen pulling operation is not hindered and the clutch device is not disturbed. Without being damaged.
[0060]
(5) When the operation code 6 is operated in the screen lowering direction at the time of raising the screen 4, the raising operation of the screen 4 can be stopped.
The above embodiment can be modified as follows.
As shown in FIG. 13, on the flange portion 16 of the clutch slider 15, a mountain-shaped projection 35 is formed on the side surface facing the pulley 5, and at the tip of the locking piece 11 a of the pulley 5, the projection 35 is formed. A chevron-shaped projection 36 that can be engaged is formed.
[0061]
When the clutch slider 15 moves so that the clutch member 20 is disengaged from the spring pulley 25 and the clutch case 30, the protrusions 35 and 36 can engage with each other as shown in FIGS. It becomes.
[0062]
In this state, when the clutch case 30 is rotated together with the winding shaft 3 by the urging force of the spring motor, the projections 35 and 36 are engaged, and rotation of the pulley 5 due to friction between the clutch case 30 and the pulley 5 is prevented. Is done.
[0063]
Therefore, at the time of the lifting operation of the screen 4 by the urging force of the spring motor, the rotation of the pulley 5 is prevented, and the operation code 6 can be prevented from being moved up and down unnecessarily.
[0064]
When the operation code 6 is continuously operated in the screen pulling direction after the engagement of the clutch member 20 with the spring pulley 25 and the clutch case 30 is released during the screen pulling operation, the protrusion 36 becomes the protrusion 35. , The pulley 5 is rotated.
[0065]
【The invention's effect】
As described in detail above, the present invention can provide a roll blind lifting / lowering device capable of easily performing a screen pulling operation and preventing damage due to unnecessary operation of an operation code.
[Brief description of the drawings]
FIG. 1 is a front view showing a roll blind of one embodiment.
FIG. 2 is a sectional view showing a clutch device.
FIG. 3 is an exploded perspective view showing the clutch device.
FIG. 4 is an exploded perspective view showing the clutch device.
FIG. 5 is a sectional view showing a clutch device.
FIG. 6 is a front view showing the clutch device.
FIG. 7 is a bottom view showing the clutch device.
FIG. 8 is a sectional view showing a clutch device.
FIG. 9 is a front view showing the clutch device.
FIG. 10 is a bottom view showing the clutch device.
FIG. 11 is an explanatory diagram showing an operation of a clutch ball.
FIG. 12 is an explanatory diagram showing an operation of a clutch ball.
FIG. 13 is a sectional view showing another example of the clutch device.
FIG. 14 is a sectional view showing another example of the clutch device.
FIG. 15 is a plan view showing another example of the clutch device.
[Explanation of symbols]
2a, 2b Support bracket 3 Winding shaft 4 Screen 5 Pulley 6 Operation code 7 Clutch device

Claims (3)

The clutch device is supported by rotatably supporting both ends of a take-up shaft that suspends and supports the screen on a support bracket, hanging an operation code from a pulley provided on the one support bracket, and rotating the pulley with the operation code. The screen can be raised and lowered by rotating the take-up shaft through the urging means, and biasing means for applying a rotational force to the take-up shaft in the screen pulling direction is provided in the take-up shaft. While transmitting the rotation of the pulley based on the operation in the screen lowering direction to the winding shaft, after the screen lowering operation, the rotation of the winding shaft due to the rotational force of the urging means is prevented, and the operation code in the screen raising direction is prevented. A roll that enables the winding shaft to rotate in the screen pulling direction based on the rotational force of the urging means by the rotation of the pulley based on the operation. In India of the lifting device,
The clutch device includes a clutch case that rotates integrally with the winding shaft, and a pulley that is integrally rotatable with the clutch case based on rotation of the pulley in a screen pulling direction. An internal device that enables the pulley to freely rotate with respect to the clutch case based on the rotation, and at the time of the screen pulling operation based on the rotational force of the urging means, the pulley can be freely rotated in the screen pulling direction. and,
The internal device,
A first clutch surface formed in the clutch case,
A clutch slider that moves in the axial direction based on the rotation of the pulley,
A second clutch surface that rotates together with the pulley and is capable of engaging with the first clutch surface. The clutch slider that moves in the axial direction based on the rotation of the pulley in the screen lowering direction. Based on the operation of the clutch slider, which engages the second clutch surface with the first clutch surface and moves in the axial direction based on the rotation of the pulley in the screen pulling direction. A lifting / lowering device for a roll blind, comprising: a clutch member that moves in a direction in which the surface and the second clutch surface are disengaged from each other . 2. The apparatus according to claim 1, wherein the first and second clutch surfaces are formed of clutch teeth that can be engaged with each other . An engagement means is provided between the pulley and the clutch slider, the engagement means being engaged with each other with a rotation torque of a predetermined value or less when the engagement of the first and second clutch surfaces is released. The roll blind raising / lowering device according to claim 1 or 2 , wherein

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