JPS5941592A - 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 used as a free strap mechanism for a roll blind.

There are two types of free-stop mechanisms that use centrifugal force to stop the screen of a roll blind at a desired position, and those that do not. Those that use centrifugal force have some difficulties in operation when releasing the stop and winding up the screen. However, those that do not use centrifugal force have the advantage of not requiring any bones for operation.

An object of the present invention is to provide a clutch device of a non-centrifugal force type free stop mechanism with good operability.

To achieve the above object, the device of the invention is characterized by a stop counter fixed to the fixed shaft of the roll blind or slidably fitted in the axial direction, a stopper provided on the stop counter, and a stop counter attached to the stop counter. A cylindrical cam rotatably fitted, a heart-shaped cam groove carved on the outer periphery of the cam, and a pole hole in the center of the cam groove,
It consists of a pole inserted into the pole hole, a U-shaped ridge that surrounds the pole hole and corresponds to the forked ends of the heart-shaped cam groove, and a cam protrusion that is integrated with the roll pipe that engages with the cam groove. , when the screen is released, the spring of the roll blind reverses the roll pipe and moves the cam protrusion from the forked end of the heart-shaped cam groove onto the pawl hole, and the pole is caught between the stopper and the cam protrusion and the roll pipe is moved. The aim is to prevent further reversal.

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

As shown in FIG. 1, an end block 2 is fixed to one end of a roll pipe 1, and a round shaft 3 is implanted in the block.

The round shaft 3 is rotatably supported by a bracket (not shown). A clutch case 4 is fitted to the other end of the roll pipe l, and the clutch case is rotatably fitted to a fixed shaft 7 via a bearing receiver 5 and a bearing pawl 6. A spring core 9 is fixed to the tip of a fixed shaft 7 with a rivet 8, and a spring mount 25 is fixed to the spring core with a rivet 10. A cover 11 is placed over the spring core, and the position is determined using a collar 12. Both ends of the spring 13 are engaged with the clutch case 4 and the spring mount 25, respectively.

As shown in FIGS. 1 and 2, a stop counter 14 is splined to the fixed shaft 7 so as to be slidable in the axial direction, and a cam 15 is rotatably fitted to the stop counter. Stoppers 16 are provided projecting on the circumference of the center of the stop counter 14 at equal arc intervals. Attach the cam cover 17 to the cam 15.
It is fixed via an L female screw 23, and the stop counter 14 is slid along with the cam 15 in the axial direction. A heart-shaped cam groove 18 is carved in the center of the circumferential surface of the cam 15, and the cam groove 18
A pole hole 19 is provided in the center. The pole hole 19 and the stopper 16 of the stop counter 14 are located on the same cross section. The thickness of the bottom of the cam groove 18 and the height of the stopper 16 are approximately equal to the radius of the pole 20 fitted into the pole hole 19. A cam projection 21 is fixed to the inner peripheral surface of the clutch case 4, and the cam projection 21 is fitted into the cam groove 18. When the roll pipe I rotates, the cam protrusion 21 causes the stop counter 14, cam 15, and pawl 20 to integrally slide in the axial direction via the cam groove 18.

As shown in FIG. 3 when the circumferential surface of the cam 15 is expanded, the cam groove 18 has an elongated heart shape, with a U-shaped land portion 22 in the center.
There is. There is a pole hole 19 between the ridges 22, into which the pole 20 fits.

As shown in FIG. 4, the stoppers 16 of the stop counter 14 spline-coupled to the fixed shaft 7 are arranged at equal arcuate intervals and protrude by a height corresponding to the radius of the pole 20. Since the thickness of the bottom of the cam groove 18 is approximately equal to the radius of the pawl 20, the pawl 20 and the cam projection 21 will not abut in the circumferential direction unless the pawl hole 19 and the stopper 16 coincide. The cam protrusion 21 has a columnar shape from the base to half its height, but is sloped from that point to the tip.

The cam projection 21 slides on the peripheral wall of the cam groove 18 with its columnar portion.

Next, the free stop by the device of the tree invention will be explained. When the screen of the roll blind is pulled out, the roll pipe 1 rotates in the direction of arrow A in FIG. 4, and the cam projection 21 is at the position a in FIGS. At this time, the pole hole 19 is
6, the pole 20 escapes radially outward within the cam 15, as shown in FIG.
In other words, the rotation of the roll pipe l is not hindered.

When the screen is released, the spring 13 in FIG. 1 rotates the roll pipe 1 in the direction of arrow B in FIG. 4, so that the cam projection 21 comes to point b in FIG. At this time, the stopper 16 is placed under the pole hole 19.
6, even if the pawl 20 tries to raise it outward, it cannot escape because of the cam protrusion 21. Therefore, the cam protrusion 21 is forced to the stopper 16 via the pawl 20 to prevent rotation. Since the rotation of the roll pipe 1 is controlled, the drawn-out screen stops and rises at that position.

From there, pull the screen a little and release it, and the screen can easily unwind. When the screen is pulled a little, the cam projection 21 reaches the 0 point in FIG. 3. When the screen is released, the spring 13 in FIG. 1 rotates the roll pipe l in the direction B in FIG. d in the diagram
Get to the point.

At this time, the pole hole 19 is always kept above the pole hole 19, and each time the stopper 16 comes below the pole hole while the roll pipe l is rotating, the pole 20 escapes outward, so the roll pipe l
The rotation of the screen is not controlled by the stopper 16, and the screen is rolled up.

Although the stop counter in the embodiment is slidably provided on the fixed shaft, it is also possible to completely fix the stop counter on the fixed shaft. Alternatively, instead of protruding the stopper from the stop counter, as shown in FIG. 7, jA 24 with a depth corresponding to the radius of the pole may be carved at equal arc intervals on the circumferential surface of the cylindrical stop counter 14. good. In this case, the partition wall 16 between circumferentially adjacent grooves becomes a stopper.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the main parts of a roller blind equipped with a device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the main parts of the device shown in FIG. 1, and FIG. Developed view of cam groove, 4th
The figure is a sectional view taken along the line IV-IV in Figure 1, and Figure 5 is a cross-sectional view along the line IV-IV in Figure 1.
6 is a view corresponding to FIG. 5 showing the state of the clutch during control, and FIG. 7 is a perspective view of a stop counter of another embodiment. l: Roll pipe, 7: Fixed shaft, 14: Stop/stop counter, 15: Cam, 16 Nist stopper, 18: Cam groove, 1
9: Pole hole, 20: Pole, 21; Cam protrusion, 22:
Ryubeno

Claims (1)

[Claims] ■) A stop counter is fixed or fitted to a fixed shaft so as to be slidable in the axial direction, a stopper that protrudes in the radial direction is provided on the stop counter, and a cylindrical cam is rotated on the stop counter. A heart-shaped cam groove is carved on the outer periphery of the cam, a pole hole is made in the center of the cam groove and the pole is inserted into the cam groove, and a heart-shaped two-pronged groove is formed in the cam groove. A U-shaped land portion surrounding the pole hole is provided corresponding to the upper end, and a cam protrusion integrated with the roll pipe is engaged with the cam groove to move the cam in the axial direction to pull out the screen of the roll blind. , the cam projection enters one of the upper ends of the two prongs of the cam groove, and when the screen is released, the cam projection enters between the U-shaped land portion of the cam groove and presses the pole of the pole hole. . A clutch device for a roll blind, wherein the pawl is sandwiched between the stopper and the cam protrusion to control rotation of the roll pipe. 2) The clutch device for a roll blind as set forth in claim 1, wherein the height of the stopper and the thickness of the bottom of the cam groove are each approximately equal to the radius of the pole as the I4 characteristic.