JPH0466990B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an improvement of a device for holding the first winding of a winding spring of a roll blind using the elastic force of the winding spring as the main power or auxiliary power for winding up the screen. Regarding.

[Prior Art] Roll blinds use coiled springs such as coil springs as the main power or auxiliary power for winding up the screen. Usually, the coiled spring is shipped with an initial winding applied to it so that the rotational force remains. At this time, relative rotation between the rotating end and the fixed end of the coil spring is prevented by a rotation stopper such as a pin or ring. This anti-rotation pin or ring must be released after the roll blind is completely installed, but there have been many accidents in which the pin or ring is accidentally released before the installation is complete, causing the coil spring to unwind. Once the first volume is returned, it is troublesome to add the first volume again.
Particularly in the case of large roller blinds, it has been virtually impossible to reapply the initial winding to the coiled spring at the construction site.

[Problems to be Solved by the Invention] When the wound spring is a coil spring, as a device to prevent this accident, a sleeve with an inner diameter approximately equal to the outer diameter of the coil spring that has been wound for the first time is fitted around the coil spring, and the coil spring is Devices that prevent spring loosening have been known, but since the friction between the outer circumferential surface of the coil spring and the inner circumferential surface of the sleeve varies widely, it is impossible to maintain a constant initial winding. However, there was a problem that the first volume changed each time the screen was operated, and the screen sometimes did not fully roll up.

The present invention has been made to solve the above problems, and its purpose is to prevent the rotation pin or ring from being accidentally set in a roll blind that uses a coiled spring as the main power or auxiliary power for winding up the screen. It is an object of the present invention to provide a device that not only maintains the initial winding applied to a coil spring without loosening even when the coil spring is removed, but also maintains a predetermined initial winding at all times.

[Means for Solving the Problems] In order to achieve the above object, the feature of the device of the present invention is that in a roll blind in which a coil spring is used as the main power or auxiliary power for winding up a screen, at least the coil spring is first wound. , the elastic repulsion force of the coiled spring is applied to the spring member provided between the screen take-up tube and the fixed shaft, and the elastic repulsion force of the coiled spring is applied at or near the deformation limit of the spring member. The reason is that the first volume is retained.

One end of the spring member is locked to a fixed shaft, and the other end is rotatably fitted to the fixed shaft so as to engage with a top rotating integrally with the screen winding tube at least when the screen approaches winding up. Form.

If the spring member is a coil spring fitted to a fixed shaft, and one end of the coil spring is locked to the fixed shaft and the other end is free, the top is screwed to the fixed shaft, and the threaded winding tube is When the fixed shaft is rotated in the direction of loosening the coiled spring, the top engages the free end of the coiled spring and compresses the coiled spring, rotates it in the direction of tightening, or both. . Alternatively, the other end of the coil spring can be directly locked to the top.

When the spring member is a spiral spring, the inner end is locked to a fixed shaft and the outer end is locked to a top, but when holding the first turn of the coiled spring, the spiral spring deforms even when it is close to the tightened state. It may be in any state that is close to being fully loosened. It goes without saying that the range of elastic deformation of the spring member locked at both ends is the same as or larger than the range of elastic deformation of the coiled spring.

[Function] Before or after inserting the fixed shaft and coiled spring into the screen winding cylinder, give a predetermined initial winding to the coiled spring and set a rotation stopper pin or ring on the rotating end side, and connect the fixed shaft and coiled spring. If the spring member interposed between the screen winding tube is set to the limit of deformation, even if the locking pin or ring is removed, the repulsive force that tries to return the initial winding of the coiled spring will cause the fixed shaft and screen winding tube to deform. Since relative rotation between the two is prevented by the spring member, the first turn of the coiled spring is maintained as it is. Since the limit of deformation of the spring member is constant, the elastic repulsion force at or near the limit is also constant, and the initial winding of the coiled spring held remains unchanged.

[Example] The apparatus of the present invention will be described based on an example shown in the drawings.

The roll blind shown in FIG. 1 is of a type in which a screen 12 is raised and lowered by pulling a string 10, and the repulsive force of a coil spring 14 acts as auxiliary power when it is rolled up. A rotating shaft 18 integral with the screen winding tube 20 is rotatably supported by one bracket 24 via a bearing, and the rotating shaft is coupled via a spring brake 22 to a pulley 16 on which a string 10 is hung. Therefore, when the pulley 16 is turned by pulling the string 10, the screen winding tube 20 will necessarily rotate, but the spring brake 22 prevents the screen winding tube from rotating due to the weight of the screen 12. The fixed shaft 30 is attached to the bracket 26 on the opposite side.
The outer end of is supported. The fixed shaft 30 rotatably supports a block 28 fitted into the end of the screen winding tube 20 via a bearing. The rotating end of the coil spring 14 is locked to a rotating ring 38 integral with the block 28, and the stationary end is locked to a fixed ring 34 fixed to a fixed shaft 30. A detent ring 36 is axially slidably mounted between the bracket 26 and the block 28 on the fixed shaft 30, and when moved toward the block, the block 28 is integrally coupled with the fixed shaft 30. A threaded portion 42 is provided on the outer periphery of an extended shaft portion 40 of the fixed shaft 30, and a top 44 is screwed into the threaded portion. A coil spring 50 wound in the opposite direction to that of the coil spring 14 is fitted to the tip of the extended shaft portion 40. The inner peripheral surface 5 of the coil spring 50 is located on the side of the top 44 facing the coil spring 50.
A conical surface 54 is formed which engages with 2.

As shown in FIG.
A protrusion 48 on the inner peripheral surface of the screen winding tube 20 is fitted into the groove, and the top 44 is rotated together with the screen winding tube 20.

The use of the apparatus of the invention will now be described with reference to FIG. After applying a predetermined initial winding to the coil spring 14, the detent ring 36 is attached to the block 28.
The rotary shaft 30 and block 28 are integrated by fitting them. Next, when the top 44 is turned and moved forward as shown by arrow A, the conical surface 54 comes into contact with the inner circumferential surface 52 of the coil spring 50, and the coil spring 50 is tightened while being pressed to a state close to its deformation limit. Rotate it in the direction you want. Then, the fixed shaft 30 is inserted into the screen winding tube 20, and at this time, the protrusions 48 on the inner peripheral surface of the screen winding tube 20 are fitted into the grooves 46 of this 44 and the grooves 29 of the block 28. Since it is brought to the construction site in this state, even if the coil spring 14 attempts to return its initial winding when the locking ring 36 is removed by mistake during installation, the coil spring 50, which is close to its deformation limit, will cause the top 44 to Since the forward movement of the coil spring 14 is blocked, the coil spring 14 cannot relax and the first winding is maintained as it is.

When the screen 12 is completely wound up, the top 44 comes into contact with the coil spring 50, but at this time, the inner peripheral surface 52 of the coil spring 50 is constantly trying to push back the conical surface 54 of the top 44. Therefore, when pulling out the screen 12, the elastic force of the coil spring 50 that tries to push back the top 44 serves as an aid.
The screen 12 can be easily pulled out.
Also, the coil spring 50 is lowered to the screen 12.
Since the shock caused when the screen is wound up all at once can be absorbed by the elastic force of the winding spring 14, the shock caused when the screen is wound up is also reduced.

In the embodiment shown in FIG. 3, a top 44 is rotatably fitted to an extension shaft 40 of a fixed shaft 30, one end of a coil spring 50 is locked to the extension shaft 40, and the other end is locked to the top 44. The first winding of the coil spring 14 is held in a state in which the coil spring 14 is fastened to the outer peripheral surface of the extension shaft portion 40, that is, in a state close to the limit of deformation. The top 44 may be slidable or non-slidable on the extension 40. As in the embodiment of FIG.
The fixed shaft 30 and the block 28 are integrated by fitting them. Next, the top 44 is inserted directly into the screen winding tube 20 by hand or by shallowly inserting the extension shaft portion 40 into the screen winding tube 20 so that the protrusion 48 of the screen winding tube 20 fits into the groove of the top 44. axis 30
Turn as desired to loosen the coil spring 14, and
As shown in the figure, the coil spring 50 is
Fasten on the circumferential surface of the Then, the entire fixed shaft 30 is inserted into the screen winding cylinder 20, the groove 29 of the block 28 is fitted into the protrusion 48, and the product is shipped in this state.
Even if the anti-rotation ring 36 is removed at the construction site, the coil spring 14 will not rotate freely.
Since the coil spring 50 is prevented from tightening, the first turn of the coil spring 14 is held without returning. When the screen 12 is fully wound up, the coil spring 50 is fully tightened, so the repulsive force is maximized. When the screen 12 is pulled out, the screen 12 is assisted by this repulsive force, so the screen 12 can be pulled out very easily.

As shown in FIG. 5, the outer end of the spiral spring 50 is locked to the top 44, and the inner end is fixed to the extension shaft 40, and when the spiral spring is close to fully tightened or fully loosened, the coil spring It is also possible to hold the first volume of . In addition, although only a device in which the screen is raised and lowered by pulling a string is shown as an example, the device of the present invention can also be used in a device in which a clutch is installed to stop the screen at an arbitrary position. Needless to say, it cannot be used as is for a system in which the screen is stopped by hanging the screen weight bar.

[Effects of the Invention] As described above, in the device of the present invention, the spring member receives the repulsive force of the coiled spring that serves as the main power or auxiliary power for winding up the screen of the roll blind, and the spring member receives the repulsive force of the first winding of the coiled spring. Since the coiled spring is previously deformed to the limit in the direction of receiving the deformation, rotation of the coiled spring to unwind the initial winding is regulated by the spring member. Therefore, even if the locking pin or ring that prevents relative rotation between the fixed shaft and the screen winding tube is accidentally removed during installation of the roll blind, the first winding of the coiled spring is held without loosening.
Since the repulsive force of the spring member at the deformation limit resisting the coiled spring is constant and does not vary each time it is wound, the initial winding of the coiled spring held is also necessarily constant, and the coiled spring always has a predetermined value. The first volume will be given. Therefore, unlike conventional devices in which a sleeve is fitted to a coiled spring to hold the first roll, there is no risk that the screen will not be completely rolled up during use. Furthermore, the device of the present invention also has the advantage that there is less shock when winding up the screen.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a roll blind equipped with the device of the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. 3 is a diagram corresponding to FIG. 1 of another embodiment. FIG. 4 is a view showing the coil spring of the embodiment shown in FIG. 3 in a tightened state, and FIG. 5 is a sectional view showing a spiral spring of still another embodiment. In the figure, numeral 12 is a screen, 14 is a coil spring, 20 is a screen winding tube, 26 is a bracket, 30 is a fixed shaft, 40
44 is a top, 46 is a groove, 48 is a protrusion, and 50 is a coil spring (spring member).

Claims (1)

[Scope of Claims] 1. A fixed shaft fixedly supported by a bracket, a screen winding tube around which a screen is wound, a fixed end of which is locked to the fixed shaft, a rotating end of which is locked to the screen winding tube, and the screen is wound up. In a roll blind equipped with a coiled spring used as the main or auxiliary power of The other end of the spring member is formed to be able to engage with the top, and as the screen winding tube rotates in the screen winding direction and the screen approaches a tightly wound state, the top of the spring member engages with the top. The spring member is engaged with the other end and elastically deformed by the elastic repulsion force of the coiled spring, thereby causing the elastic repulsion force when the coiled spring reaches its initial winding and the elastic repulsion of the spring member that receives the elastic repulsion force. A roll blind first roll holding device characterized by being set so that the forces are balanced. 2. The roll blind according to claim 1, wherein the fixed shaft and the top are threadedly engaged, the spring member is made of a coil spring, and the top engages with the coil spring from the free end side. First volume holding device. 3 The top is fitted onto a fixed shaft so that it cannot move in the axial direction,
2. The first roll holding device for a roll blind according to claim 1, wherein the spring member is a coil spring having one end fixed to a fixed shaft and the other end fixed to a top. 4 The top is fitted onto a fixed shaft so that it cannot move in the axial direction,
2. The first roll holding device for a roll blind according to claim 1, wherein the spring member is a spiral spring having an inner end fixed to a fixed shaft and an outer end fixed to a top. 5. The device according to any one of claims 1 to 4, wherein a groove is carved on the outer periphery of the top, and a protrusion on the inner periphery of the screen winding tube is fitted into the groove. Initial roll holding device for roll blinds.