JPH0327718B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an initial roll locking device for a spring-loaded roll blind and shutter that does not have a clutch locking device.

Roller blinds and shutters that wind up a drawn-out screen using a built-in spring are usually shipped with the spring given a predetermined initial winding, but conventional blinds and shutters that do not have a clutch locking device are
In order to stop the rebound rotation caused by the first winding of the spring, the spring was secured by inserting a pin that passed through the central shaft on the stationary side and the outer shaft on the rotating side that wound the screen. The pin must be removed during installation, but
There were problems in that it was difficult to remove the pins in some places, and if the pins were lost after being removed, the removal work of the main body was fraught with danger due to the reversal caused by the first winding.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems by providing a locking device that requires no effort to release the lock and does not have the risk of being lost.

In order to achieve the above object, the device of the present invention is characterized by having a center shaft fixed to a bracket, an outer shaft rotatably fitted onto the center shaft, a roll pipe that rotates integrally with the outer shaft, and the roll. In a roll blind or shutter with a built-in winding spring equipped with a screen wrapped around a pipe,
An elastic coil-shaped brake ring wound in the same direction as the screen is fitted onto the center shaft, one end of the brake ring is fixedly locked to the center shaft, and the other end is removably locked to the locking part of the outer shaft. The shape of the locking portion is such that when the outer shaft is turned in the direction to pull out the screen, the other end of the brake wheel will automatically come off.

The apparatus of the present invention will be explained based on embodiments shown in the drawings. As shown in FIG.
wrapped around. A central shaft 4 concentrically inside the outer shaft 3 is fixed to a bracket 5, and the bracket 5 is fixed to a window frame or the like. Although not shown, one end of the spring built into the roll pipe is attached to an extension of the inner shaft 4, and the other end is attached to an extension of the outer shaft 3. A hole 6 is made in the center shaft 4 between the bracket 5 and the outer shaft 3, and one end 8 of a spring-like brake wheel 7 is locked in the hole.
The brake wheel 7 revolves around the center shaft 4 and its free end 9 is locked in a notch 10 in the outer shaft 3. The notch 10 is cut in the direction in which the screen 1 is pulled out.

The first roll is applied to the roll blind to be shipped, and the free end 9 of the brake wheel 7 is inserted into the notch 10 of the outer shaft 3. The cut-wound spring tries to rotate the outer shaft 3 in the direction to wind up the screen 1, but the free end 9 enters the depth of the notch 10 and stops the rotation of the outer shaft 3, so the outer shaft 3 does not rotate. The first winding of the spring is retained.

The shipped roll blinds are placed in a box 11 and screen 1 as shown in Figure 2.
The tip 12 of is locked in the outlet 13. When the screen 1 is pulled out a little in this state, the free end 9 of the brake wheel 7 comes off the notch 10, separates from the outer shaft 3, and fixes the fixed end 8 between the bracket 5 and the outer shaft 3, as shown in FIG. located on the same circumference as When the roll blind is removed from the box 11, the free end 9 of the brake wheel 7 is fitted into the notch 10 of the outer shaft 3 again and then removed from the box 11, so that the brake wheel 7 prevents the spring from rotating in the opposite direction due to winding. This allows work to be carried out safely.

As shown in FIGS. 4 and 5, a groove 20 extending in the axial direction is provided in the center shaft 4, and a brake wheel 7 is provided in the groove.
Attach 8 on one end. Brake wheel 7 is screen 1
The free end 9 is wound in the same direction as the outer shaft 3, and the free end 9 is wrapped around a convex portion 21 provided on the end surface of the outer shaft 3. The convex portion 21 is the outer shaft 3
A plurality of them are provided in an equi-arc shape on the end face of, and both side faces 22 are inclined in a mountain shape. The center shaft 4 is fixedly supported by a bracket 5, and the outer shaft 3 is rotatably supported by the center shaft 4 via a ball 23. A protrusion 24 is provided at a position on the circumference of the center shaft 4 corresponding to the free end 9 of the brake wheel 7. A cover 25 is fixed to the center shaft 4 to cover the convex portion 21 of the outer shaft 3. The cover 25 is provided with an axial groove into which the free end 9 of the brake wheel 7 is inserted, and a gap is left between the inner surface of the cover 25 and the convex portion 21 of the outer shaft 3 into which the free end is inserted.

Since the roll blind to which the first winding is applied tries to rotate the outer shaft 3 in the winding direction of the screen 1, the convex portion 21 acts in the direction of winding and tightening the free end 9 of the brake wheel 7, causing the brake wheel 7 to rotate toward the center shaft. 4, the outer shaft 3 is prevented from rotating and the initial winding is maintained. Even if an external force is applied to remove the free end 9 from the convex portion 21, as long as the brake wheel 7 does not loosen, the center shaft 4
Since the upper protrusion 24 cannot be crossed, the free end 9 returns against the external force and prevents the outer shaft 3 from rotating.

When the screen 1 is pulled out, the outer shaft 3 integrated with the roll pipe 2 rotates, and the convex portion 21 acts on the free end 9 in a direction to relax the brake wheel 7. As a result, the brake wheel 7 loosens and is pushed outward in the axial direction along the inclined side surface 22 of the convex portion 21 and passes over the protrusion 24 . The brake wheel 7 as a whole moves axially outwards, and the free end 9
is located in the gap between the convex portion 21 and the cover 25, so there is nothing that impedes the rotation of the outer shaft 3, and the roll pipe 2 integrated with the outer shaft can also be rotated freely.

If you want to remove the roll blind with the first winding still applied, push the brake wheel 7 inward in the axial direction with your finger and lock the free end 9 to the protrusion 21 to prevent the roll pipe 2 from rotating due to the first winding. and can work safely. It is desirable that both side surfaces 22 of the convex portion 21 be formed into slopes that are difficult to come off when the screen is locked and easy to come off when the screen is pulled out.

Since the brake wheel of the device of the present invention is fixed at one end to the center shaft, there is no risk of losing it, and the locking action is automatically released by pulling out the screen, so it does not take much time to release the locking action. There isn't. The locking action is performed simply by hooking the free end of the brake wheel onto the notch or convex portion of the outer shaft with a fingertip.

[Brief explanation of the drawing]

The drawings show the main parts of a roll blind equipped with an embodiment of the present invention, and FIG. 1 is a perspective view;
Figure 2 is a cross-sectional view showing the state when installed, Figure 3 is a front view showing the state when unlocked, and Figures 4 and 5.
The figure corresponds to FIGS. 2 and 3 of another embodiment. 1...Screen, 2...Roll pipe, 3...
...outer shaft, 4...middle shaft, 5...bracket, 6...
Hole, 77... Brake wheel, 8... One end (fixed end),
9...Other end (free end), 10...Notch, 20...
...Groove, 21...Protrusion, 24...Protrusion.

Claims (1)

[Scope of Claims] 1. A bracket 5, a center shaft 4 fixed to the bracket, an outer shaft 3 rotatably fitted onto the center shaft, and a roll around which the screen 1 is wound and rotates integrally with the outer shaft. In a roll blind or shutter with a built-in spring equipped with a pipe, an elastic coil-shaped brake ring 7 wound around the center shaft 4 in the same direction as the screen is fitted between the inner surface of the bracket and the outer end surface of the outer shaft. , a recess 6, 2 in which one end 8 of the brake wheel 7 is provided in the center shaft;
0, and the other end 9 is removably latched to engaging portions 10 and 21 provided on the outer shaft. 2 Hole 6 provided in center shaft 4 with one end 8 of brake wheel 7
and the other end 9 is locked in a notch 10 cut into the outer shaft in the drawing direction of the screen 1, according to claim 1. Stop device. 3. Fit one end 8 of the brake wheel 7 into an axially extending groove 20 provided on the center shaft 4, provide a convex portion 21 on the end surface of the outer shaft, and lock the other end 9 of the brake wheel to the convex portion; The first roll locking device for roll blinds and shutters according to claim 1, characterized in that a protrusion (24) is provided at a position corresponding to the convex portion on the circumference of the center shaft.