JPS58173277A - Clutch apparatus of roll blind - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clutch device for a roll blind.

Conventional roller blind clutches are mainly centrifugal clutches using pawls, bottles, balls, etc., and the engagement and release of the clutch depends on the magnitude of centrifugal force, that is, the unwinding speed of the screen.

For example, in order to unwind the screen and fix it in a desired position, place your hand on the bottom edge of the screen when unwinding, suppress the rotation of the clutch against the winding force of the spring, and engage the clutch. There is a need. In addition, in order to release the clutch once engaged, it is necessary to pull the screen strongly, then release the hand at that moment, rotate the clutch by the winding force of the spring, and push the engaging member of the pawl to the side by centrifugal force. was there. Such a latch cannot eliminate the drawback that the more the clutch is engaged, the more difficult it is to release, and conversely, the more the clutch is released, the harder it is to engage.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roll blind clutch device which is independent of centrifugal force and which can eliminate the above-mentioned drawbacks. In order to achieve the above object, the device of the present invention is characterized in that a braking body is fitted onto the fixed shaft of the roll blind via a buffer spring so as to be rotatable by about half a turn, and the braking body engages with the braking body. The braked body is fitted around a fixed shaft so that it can rotate and slide freely.
A cam groove is provided on the outer circumferential surface of the braked body, and a cam that engages with the cam groove is integrally provided on the roll pipe. When the screen is pulled out and the roll pipe is rotated, the braked body is separated from the brake body, and there When the screen is released and the take-up spring reverses the roll pipe, the driven body engages with the braking body, and when the screen is pulled out a little and released, the braked body separates from the brake body and the screen is rolled up by the take-up spring. The reason is that the cam groove is formed so that the

The apparatus of the present invention will be explained based on embodiments shown in the drawings.

As shown in FIGS. 1 and 2, a brake member 6 of the clutch is attached to a fixed shaft 4 at one end of the roll pipe 3 that wraps around the screen 2 of the roll blind 1 via a buffer spring 5 so that it can rotate about half a turn. Installation, fixed 1f facing the braking body
Coil or ring-shaped brake spring 7 in position above +4
The braked body 8 of the clutch is loosely fitted through the clutch so as to be slidable in the axial direction.

A clutch case 9 containing a braking body 6 and a braked body 8 is loosely fitted onto the fixed shaft 4, and a collar l is attached to the end surface of the clutch case.
Insert the O and the peripheral surface is integrally fitted to the inner surface of the roll pipe 3. A cam 11 protruding inward from a clutch case 9 is provided, and the cam is fitted into a cam groove 12 provided on the outer periphery of a braked body 8. A spring 20 is attached to the inner end of the fixing member 114 via a knock 21. The rotating end of the take-up spring 19 is fixed to the inner end of the clutch case.

As shown in FIG. 2, the brake body 6 is formed with interlocking teeth 13, 14 on the opposite side of the driven body 8.

The cam groove 12 of the braked body 8 is in the shape of a box and has a protrusion 15 inside.

When the clutch case 9 rotates together with the roll pipe 3, the third
As shown in FIG. 7, the cam 1 causes the braked body 8 to slide in the axial direction via the cam groove 12. When the screen is pulled out, the cam 11 and the cam receiver on the protrusion 15 are moved to position A, and as shown in FIG. They mesh well. Therefore, the roll pipe can rotate freely and the screen can be pulled out smoothly.

When the screen is released, the roll pipe is reversed by the winding spring, so the cam 11 moves to the cam groove 120B position, and as shown in FIG. Engage 14. At this time, the buffer spring 5 (FIGS. 1 and 2) of the brake body 6 absorbs the shock when the cam 11 is connected. This not only prevents the cam groove 12 and the teeth 13.14 from being damaged, but also allows the brake body 6 to rotate within half a turn and the teeth 13.14 to fully engage with each other.

When you pull the screen a little and release it, as shown in Figure 6,
First, the cam 11 reaches the position C of the cam groove 12, and then,
As shown in FIG. 7, the cam groove 12 moves to position D. Therefore, the braked body 8 separates from the brake body 6, and since the teeth 13 and 14 of both of them engage with each other, the roll pipe is reversed by the force of the winding spring, and the pulled-out screen is rolled up. When the coppers 13, 14 are disengaged, the brake body 6 is returned to its initial position by the damping spring. Moreover, the brake spring 7 prevents the brake target 8 from rotating freely.

As mentioned above, the clutch action of the device of the present invention is caused by centrifugal force,
(i.e., the screen drawer)
1”A3.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a roller blind equipped with a device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the clutch shown in FIG. 1, and FIGS. 3 to 7 are cam grooves. FIG. 4 shows the state when the screen is pulled out, FIG. 5 shows the state when the screen is stopped, and FIGS. 6 and 7 show the state when the screen is rolled up. 1: Roll blind 2 Screen 3: Roll pipe 4: Fixed shaft 5: 111i1 spring 6: Braking body 7: Brake spring 8: Braked body 9: Clutch case l
l: Cam 12: Cam groove Hi, 14: Teeth 15: Tulong Applicant Tone Co., Ltd.

Claims (1)

[Scope of Claims] l) In a roller blind in which the screen is rolled up to a roll vibe via a winding spring, a braking body is fitted to a fixed shaft via a buffer spring so as to be movable together within a limit, and the braking body and A braked body to be engaged in braking is rotatably and slidably fitted on the fixed shaft, a cam groove is provided on the outer periphery of the braked body, and a cam that engages with the cam groove is integrally provided on the roll pipe. When the screen is rolled out and the roll pipe is rotated, the cam separates the braked body from the brake body, and when the screen is released and the take-up spring reverses the roll pipe, the cam separates the braked body from the brake body. the brake body is pressed against the brake body for braking engagement, and when the screen is pulled slightly and released, the cam separates the brake body from the brake body and the winding spring winds up the screen. A roll blind clutch device characterized by forming a cam groove. 2) A dogleg-shaped cam groove is provided on the side opposite to the brake body, and the perpendicular part is on a cross section perpendicular to the shaft, and a protrusion is provided at the intersection of the diagonal part and the perpendicular part of the cam groove. When the cam pulls out the screen, the cam receiver of the protrusion is in position, and when the screen is released, it is at the tip of the front oblique line, and when the screen is pulled out a little and released, it passes through the outer end of the intersection and moves to the perpendicular line. A clutch device for a roll blind according to claim 1, characterized in that the clutch device is adapted to move to a leading end position. 3) A ring-shaped or coil-shaped spring is fitted onto the fixed shaft so that it can be tightened and loosened, and a braked body is fitted onto the fixed shaft from above the spring, and both slightly open protruding ends of the spring are fitted. A brake retaining portion between the braking body and the braking body, which is loosely fitted into a space provided on the inner periphery of the braked body, and an inner circumferential protrusion of the braked body is loosely fitted between the two protruding ends. A clutch device for a roll blind according to claim 1 or 2, characterized in that the clutch device is formed with teeth that engage with each other.