JPS6340638Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lifting/lowering stopping device for a roll blind.

Conventionally, roll blinds are equipped with a torsion spring that always works in the direction of rolling up the raw cloth in the raw cloth winding cylinder that winds up the raw cloth, and when the raw cloth is pulled down, the raw cloth is rolled up by a ratchet that uses centrifugal force. is stopped at a desired position, and when pulling up the raw cloth, the ratchet is released by pulling the raw cloth slightly, and the raw cloth is wound up into a cylinder by the action of the above-mentioned torsion spring. It is configured.

However, in such a conventional roller blind lifting/lowering stop device, it is troublesome to stop the cloth at a desired position, and it is difficult to stop the cloth at a desired height.

The present invention provides a lifting and lowering stop device for roll blinds that can reliably stop the raw fabric of roll blinds at a desired position by using a simple switching device instead of the above-mentioned ratchet in conventional roll blinds. This is what we are trying to provide.

As mentioned above, the present invention has been developed by stopping the raw cloth winding cylinder, which is equipped with a torsion spring that always acts in the direction of winding up the roll blind raw cloth, at a desired position against the force of the torsion spring. In a roll blind lifting/lowering stop device that stops the cloth at a desired height, a clutch drum receiver is fixed coaxially with the above-mentioned winding cylinder, and can be rotated in a fixed direction by a bracket that supports one end of the above-mentioned roll blind. A clutch drum supported by the clutch wheel so as to be rotatable by a certain angle is loosely fitted coaxially into a clutch drum receiver, and a stopper is disposed on the wall of the clutch drum so that it can move in and out. , in order to move the stopper in and out, the clutch is disposed in the clutch drum so as to be able to rotate left and right by a certain angle, and by its rotation moves the stopper to an extended position or a retracted position. a second clutch wheel integrally formed with the clutch shaft; a third clutch wheel loosely fitted onto the clutch shaft and movable in the axial direction with respect to the clutch drum; The clutch wheel is equipped with a spring that elastically presses the clutch wheel at all times, and only the rotation in the direction of pulling down the fabric is transmitted to the contact surface between the second clutch wheel and the first clutch wheel, and the rotation in the same direction is transmitted by the clutch spring. A plurality of clutch pawls are formed to rotate together with the clutch drum when the first clutch wheel is rotated, and a protrusion that abuts a protrusion of the clutch drum is formed on the edge of the first clutch wheel.

Further, the same number of clutch pawls are formed on the contact surfaces of the second clutch wheel and the third clutch wheel to transmit only the rotation of the third clutch wheel in the cloth pulling direction to the second clutch wheel, and the protruding position of the stopper is The clutch drum and the clutch drum holder are integrally connected, and when the cloth is pulled down, the stopper is projected into the clutch drum, and the winding cylinder and the clutch drum are rotated together. A clutch device that reverses slightly upward to stop the rotation of the take-up cylinder when the cloth stops being pulled down, and that retracts the stopper by pulling the cloth downward when pulling the cloth upward. Provided is a lifting/lowering stop device for a roll blind, characterized in that the above-mentioned clutch drum is provided with:.

Further, a speed reduction device is arranged between the clutch drum and the winding cylinder. According to the lifting and lowering stop device of the present invention, when the raw cloth is lowered to a desired position, the raw cloth is stopped being pulled down at this position, and the raw cloth is released, the raw cloth stops at that spot, and then the raw cloth is lowered downward. A slight pull to release the stop device and wind the fabric onto the winding tube.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, 1
is the raw cloth of the roll blind; 2 is a winding cylinder for winding up the raw cloth; and 3 is a torsion spring that always works to rotate the cylinder in the direction in which the raw cloth is rolled up.

At the end of the winding cylinder 2, a cylinder part 2' is integrally connected, in which a lifting stop according to the invention is accommodated.

The device of the present invention comprises a clutch drum receiver 4 fixed coaxially to the winding cylindrical portion 2', and a clutch drum 5 loosely fitted coaxially therein.
The clutch drum 5 has a clutch frame 5a formed integrally therewith, and an arc-shaped protrusion 5 formed at its end.
b engages with projections 6a, 6a formed on a first clutch wheel 6 which fits into a bracket 15 supporting one end of the roll blind, and is supported by the clutch wheel 6 so that the clutch drum 5 can rotate by a certain angle (see Figures 3 and 4).

A slot 5c is formed in the wall of the clutch drum 5, into which a stopper 7 is arranged so as to be freely removable and retractable, and in the retracted position of the stopper 7, the clutch drum receiver 4 and the clutch drum 5 are relatively free. However, when the stopper 7 protrudes, it engages with the protrusion 4a formed on the inner surface of the clutch drum receiver 4, and the clutch drum 5
and the clutch drum bridge 4 are connected to rotate together.

A clutch device for moving the stopper 7 in and out is arranged in the clutch drum 5 so as to be able to rotate left and right by a certain angle, and by its rotation, the clutch device moves the stopper 7 to the protruding position or to the left or right. A clutch shaft 8 that is moved to the retracted position, a second clutch wheel 9 formed integrally with the clutch shaft, and a second clutch wheel 9 that is loosely fitted onto the clutch shaft 8 and is movable in the axial direction with respect to the clutch frame 5a. Third clutch wheel 10
and a spring 11 that always elastically presses these clutch wheels. A protrusion 10a is provided around the third clutch wheel 10.
is formed and engages in a groove 5d formed on the inner surface of the clutch frame 5a, so that the third clutch wheel 10 is movable in the axial direction with respect to the clutch frame 5a of the clutch drum 5. , and is adapted to rotate together with the second scratch wheel 9, and is constantly pressed against the second scratch wheel 9 by the action of the spring 11 mentioned above. Further, the clutch shaft 8 is formed with a groove 8a and a protrusion 8b, and by rotating the clutch shaft 8, the stopper 7 can be extended or retracted from the clutch drum 5. There is.

On the contact surface between the second clutch wheel 9 and the first clutch wheel 6, there are a plurality of clutch claws 9a and 9a that transmit the rotation of the second clutch wheel 9 only in the cloth pulling direction (indicated by B in the figure). 6
The end of the clutch spring 14 is attached to the protrusion 15a of the bracket 15 so that the shaft 6b of the first clutch wheel 6 is rotated in the B direction by the one-way clutch spring 14 but is prevented from rotating in the A direction. 14b is engaged.

Further, on the contact surface between the second clutch wheel 9 and the third clutch wheel 10, there are a plurality of clutch pawls 9b and 10 that allow the third clutch wheel 10 to rotate only in the cloth pulling direction (indicated by B in the figure).
b is formed.

Furthermore, a speed reducer 12 (see FIG. 1) is arranged between the clutch drum 5 and the winding cylinder 2.
In the figure, 13 indicates a core shaft that engages with the clutch drum 5.

Next, the operation of the device of the present invention will be explained with reference to FIG.

A shows the raw cloth being wound around the winding cylinder, B shows the raw cloth stopped midway, and C shows the raw cloth being rolled upwards after it has been completely pulled down. .

Now, I will explain how to pull down the raw cloth to change it from A to B.

First, when pulling down the raw cloth 1, the winding cylinder 2 is rotated in the direction B so that the stop 7 is projected into the clutch drum 5, and the winding cylinder 2 is rotated in the direction B.
The clutch drum receiver 4 and the clutch drum 5 are integrally connected to each other, and the arc-shaped protrusion 5b formed at the end of the clutch drum 5 is connected to the first clutch wheel 6.
The raw cloth is pulled down to a desired position by colliding with the protrusion 6a (see FIG. 3B) and then rotating together.

At this time, by stopping the pulling down of the raw cloth, the raw cloth is reversed in the opposite direction by one pawl of the first clutch wheel 6, and after that, the first clutch wheel 6 is moved in the A direction by the one-way clutch spring 14. Since rotation to is not allowed, the rotation of the winding cylinder 2 is stopped at that position. (See Figure 3 A) Next, we will explain the case where the raw cloth is brought into the state from B to B when being pulled up. By pulling the raw cloth 1 downward (see Figure 3 B). The second clutch wheel 9 and the third clutch wheel 10 are engaged with each other by pawl 1.
As a result, the stopper 7 is retracted into the clutch drum 5 and the winding cylinder is rotated freely to wind up the raw cloth 1 onto the winding cylinder 2.

In the above configuration, when the raw cloth 1 is pulled down from the state where the raw cloth 1 is wound around the winding cylinder 2, the winding cylinder 2
rotates in the direction B shown in FIG.
The clutch drum 5 fitted on the core shaft 13 is rotated in the direction B, and the raw cloth can be lowered. At this time, by pulling the raw cloth downward, the rotation of the second clutch wheel 9 is prevented by the engagement of the clutch pawl 9a of the second clutch wheel 9 and the clutch pawl 6c of the first clutch wheel 6, but the second clutch wheel 9 is prevented from rotating. The clutch wheel 10 of No. 3 is rotated in the direction B together with the clutch drum 5 by the core shaft 13 that engages with the reduction gear 12.

As a result, the clutch frame 5a is rotated, and the third clutch wheel 10 is rotated together with the clutch frame 5a.
Rotate in direction B by one clutch pawl.

As a result, the rotation stopper 7 protrudes from the slot 5c formed in the wall of the clutch drum 5 by the protrusion 8b of the clutch shaft 8, thereby causing the rotation stopper 7 to protrude from the slot 5c formed in the wall of the clutch drum 5. The protrusion 5b of the clutch drum 5 engages with the protrusion 4a.
Since the clutch wheel rotates while pressing the protrusion 6a of the first clutch wheel 6, the cloth can be pulled down to a desired position. If you let go of the fabric at that position, the take-up cylinder 2 will rotate the clutch drum 5 in the direction A due to the drag force of the torsion spring 3, but the relative position of the second clutch wheel 9 and the third clutch wheel 10 will does not change, so the protrusion 4a of the clutch drum receiver 4 and the rotation stopper 7 are engaged, so the protrusion 5b of the clutch drum 5 abuts against the protrusion 6a of the first clutch wheel 6. The rotation of the winding cylinder 2 is stopped, and the raw cloth is thus stopped at the desired position.

Next, to wind up the raw cloth to its original position, pull down the raw cloth and rotate the winding cylinder again in the direction B, thereby rotating the clutch frame 5a in the direction B by one pawl. Since the clutch pawl 6b of the wheel 6 and the second clutch wheel 9 are in an engaged state, the third clutch wheel 10 rotates by one pawl in the direction B, which causes the clutch shaft 8 to rotate.
The relative position of the third clutch wheel 10 and the clutch drum 5 rotating together changes, and the rotation stopper 7 is retracted into the clutch drum 5.

Therefore, the engagement between the winding tube 2 and the clutch drum 5 is disengaged, and the winding tube 2 is rotated by the elastic force of the torsion spring 3, thereby winding up the cloth.

The speed reduction device 12 is used to smoothly wind up the raw cloth, and its main body is fixed to the winding cylinder 2, and the core shaft 13 is fitted and fixed to the clutch drum.

As mentioned above, the present invention allows the stopper to be reliably switched by repeatedly raising and lowering the roll blind, and since the stopper is switched repeatedly and reliably, the fabric can be easily fixed in the desired position. The clutch is automatically switched by operating the cloth in the direction of pulling it down, and does not require any skill to operate.It is easy to operate, and the cloth can be continuously pulled downwards, so there is no possibility that a child may accidentally touch the main unit. Since the raw cloth falls even when hanging, damage to the raw cloth is prevented. In addition, since the raw cloth can be pulled down with the rotary stopper protruding, the winding cylinder 2 always returns in the same direction in the A direction when the hand is released, so several roll blinds of the present invention can be used side by side. Even when installed, there is no difference in height dimension, and a roll blind that is preferable in terms of design is provided.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the lifting/lowering stop device for a roll blind according to the present invention;
B is a cross-sectional view taken along the - line in Figure 1, Figure 3 A and B are cross-sectional views taken along the - line in Figure 1, and Figure 4 is a cross-sectional view taken along the - line in Figure 1.
This figure is an exploded perspective view showing details of the clutch device shown in FIG. 1. DESCRIPTION OF SYMBOLS 1... Raw cloth, 2... Winding cylinder, 3... Torsion spring, 4... Clutch drum receiver, 5... Clutch drum, 6... First clutch wheel, 7... Stop, 8... Clutch shaft, 9...Second clutch wheel, 10...Third clutch wheel, 11
... Spring, 12 ... Speed reduction device, 13 ... Core shaft, 14 ... One-way clutch spring, 15 ... Bracket.

Claims (1)

[Claims for Utility Model Registration] (1) By stopping a raw cloth winding cylinder equipped with a torsion spring that always acts in the direction of winding up the roll blind raw cloth at a desired position against the force of the torsion spring. In a roll blind lifting/lowering stop device that stops raw cloth at a desired height, a clutch drum receiver is fixed coaxially with the winding cylinder, and a bracket supporting one end of the roll blind rotates in a fixed direction. A clutch drum supported by the clutch wheel so as to be rotatable by a certain angle is loosely fitted coaxially into a clutch drum receiver, and a stopper can be moved in and out of the wall of the clutch drum. In order to move the stopper in and out, the clutch drum is arranged so as to be able to rotate left and right by a certain angle in the clutch drum, and the rotation moves the stopper to an extended position or a retracted position. a movable clutch shaft, a second clutch wheel integrally formed with the clutch shaft, a third clutch wheel loosely fitted onto the clutch shaft and movable in the axial direction with respect to the clutch drum; a spring that always elastically presses the clutch wheel; A plurality of clutch pawls are formed so that the clutch pawls of the second clutch wheel and the third clutch wheel are engaged with each other and rotate together as one unit by a one-way clutch spring, and the contact surfaces of the second clutch wheel and the third clutch wheel are relative to each other by one clutch pawl width. The clutch drum and the clutch drum receiver are integrally connected at the protruding position of the stop, and when the raw cloth is pulled down, the stop protrudes into the clutch drum, The take-up cylinder and the clutch drum are rotated together, and when the cloth is stopped being pulled down, it is slightly reversed upwards to stop the rotation of the take-up cylinder, and when the cloth is pulled upward, the cloth is rotated. A lifting and lowering stop device for a roll blind, characterized in that a clutch device capable of retracting the stopper by pulling it downward is provided in the clutch drum. (2) The lifting/lowering stop device for a roll blind according to claim 1, which is provided with a speed reduction device between the clutch drum and the winding cylinder.