JPH0411120Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention is a type of roll screen that is opened and closed by winding up or unrolling raw cloth onto a pipe for winding raw cloth. The present invention relates to a coil spring device used to apply a desired cloth winding force to a pipe.

Generally speaking, the coil spring device of the present invention winds up the raw cloth using a cloth winding pipe that has a built-in coil spring that always acts in the direction of winding up the raw cloth, and when the raw cloth is unrolled, the coil spring is located at a desired position. This is suitable for use in a roll screen that stops the raw cloth at a desired height by means of a stopper that stops the rotation of the raw cloth winding pipe against the force of. In addition, the coil spring device of the present invention is not limited to the spring-driven type described above, but also includes a manual type roll screen that winds up raw cloth by rotating a pulley provided at one end of the raw cloth winding roll using an operating cord. It can also be used as an auxiliary for an electric type roll screen in which a raw cloth winding pipe is rotated by an electric drive device such as a motor.

[Background of the idea]

In the type of roll screen equipped with a cloth winding pipe with a built-in coil spring, when the roll screen is mounted on a ceiling or wall with a support such as a bracket, the coil spring built in the raw cloth winding pipe is The first turn must be applied to give the coil spring the desired strength of elasticity. Here, the desired strength of elasticity is the strength sufficient to completely roll up the raw cloth on the roll screen onto the raw cloth winding pipe.If the force of the coil spring is too weak, the raw cloth will It becomes impossible to completely roll up to the bottom end, and
If the winding force is too strong, unnecessary force will be applied to the cloth itself or to various parts of the winding mechanism, resulting in damage to the cloth, damage to the winding mechanism, or failure to wind up the cloth properly. occurs. In other words, it is necessary to apply an optimum force to the coil spring according to the weight of the cloth. or,
In the case of manual type roll screens and electric type roll screens, a coil spring is used as an auxiliary to keep the operating force when operating the operating cord and the load applied to the motor as small as possible or constant. There are cases where Even in such a case, it is necessary to apply an optimum force to the coil spring according to the weight of the cloth in order to keep the operating force and the load applied to the motor constant or small.

However, it is difficult to give such optimum elasticity to the coil spring when attaching the roll screen to the bracket, and it is especially difficult to attach the coil spring to the bracket with the initial winding still attached to the coil spring. In practice, this requires extremely difficult work. Further, since the coil spring is built in the raw cloth winding pipe, it is difficult to give the coil spring its first winding after the raw cloth winding pipe is attached to the bracket.

[Purpose of invention]

In view of the above-mentioned defects in the roll screen, the present invention provides the coil spring built into the raw cloth winding pipe with an initial winding of optimal strength according to the weight of the raw cloth to be wound on it. By locking the winding of the coil spring in the same state and attaching this raw cloth winding pipe to the bracket, by releasing the winding lock described above, it is extremely easy to wind the raw cloth at the optimum initial winding on site. The object of the present invention is to provide a roll screen that can be applied to an intake pipe.

[Summary of the idea]

In the coil spring device according to the present invention, a drive ring is rotatably attached to one end of a mandrel holding a coil spring, one end of the coil spring is fixed to the drive ring, and the other end is fixed to the other end of the mandrel. The drive ring is fixed to the inner wall of the raw cloth winding pipe, and the end of the mandrel protruding from the drive ring is fixedly connected to a support that pivots the raw cloth winding pipe, and the coil spring is fixed to the inner wall of the raw cloth winding pipe. In a coil spring device that applies torque to the raw cloth winding pipe by applying a load to the raw cloth winding pipe, the mandrel has a tapered portion on one side and a stepped portion on the other side, protruding in the radial direction near the protruding end of the mandrel. forming a protrusion having a shape, the drive ring is provided with a protrusion that engages with a step of the protrusion;
The drive ring is mounted so as to be movable a certain distance relative to the axial direction of the mandrel.

[Example of idea]

The present invention will be described below based on embodiments shown in the drawings.

Fig. 3 is a front view of the main parts of a roll screen incorporating the coil spring device of the present invention, in which 1 is raw cloth, 2 is a raw cloth winding pipe, 3 and 4 are brackets, and 5 is the coil spring device. showing,
Fig. 1 is an exploded perspective view showing the coil spring device 5, and Fig. 2 A, B, and C are sectional views showing the coil spring device during torque adjustment. In the figure, 13 is a coil spring, 6 is a shaft, and 7 is a a locking member fixed to one end of the mandrel; 8 fixed to the other end of the mandrel;
A fixing member 9 fixes one end of the spring, a drive ring 10 fixed to one end of the cloth winding pipe 2;
Reference numeral 11 indicates a bearing that rotatably receives the end portion of the fixing member 8, and 11 a cylindrical body that covers the coil spring (see FIG. 2 A, B, and C).

In the coil spring device of the present invention, the coil spring 13 is fixed at both ends to the drive ring 9 and the fixing member 8 in a stretched state so as to draw them together.

That is, in FIG. 2, a force is constantly acting to move the drive ring 9 to the right. In the embodiments shown in Figure 2 A, B, and C, the spring portion is covered to prevent the spring from rusting and to stabilize the torque in order to restrict the movement distance of the drive ring to the right to a certain distance. Although the cylindrical body 11 also serves as a regulating member, a regulating stopper 14 may be provided on the locking member 7 as shown in FIGS. 4 and 5. Similarly, the stepped portion 7a restricts the leftward movement distance of the drive ring.
is formed on the locking member 7.

The embodiments shown in FIGS. 4 and 5 are otherwise the same as those shown in FIGS. Further explanation will be omitted.

The drive ring 9 has a recess 9a on its side surface, and a projection 9b that protrudes in the radial direction is formed on a part of the inner circumference of the drive ring 9. On the other hand, the locking member 7 fixed to one end of the mandrel 6 has a protrusion 12 that protrudes in the radial direction, and this protrusion has a protrusion 12 that prevents rotation of the mandrel 6 in the spring release direction (direction A in the figure). The step portion 12a engages with the protrusion 9b of the drive ring 9, and when the shaft 6 rotates in the spring biasing direction (direction B in the figure), the shaft 6 is moved in the longitudinal direction to resist the tension of the coil spring. It has a tapered slope 12b that moves over the protrusion 9b.

Since the present invention has the above-described structure, when biasing the spring during assembly of the roll screen or adjustment prior to installation on a window surface, etc., the locking member 7 fixed to the end of the shaft 6 and the drive ring are used. 9 relative to each other (the locking member 7 in the direction of FIG. The protrusion 9b is pushed to the left and the drive ring 9 moves to the left (see Figure 2 C), the protrusion 9b climbs over the protrusion 12 and the drive ring 9 continues to rotate until the coil spring reaches a predetermined torque. 13 can be energized. When the rotation is stopped in this state and the hand holding the drive ring 6 is released, the drive ring 6 rotates in the opposite direction due to the rotational torque stored in the coil spring 13 (relatively, the locking member 7 moves in the direction A in FIG. 1). ), the protrusion 9b of the drive ring 9 rotates within one rotation to the stepped portion 12a of the protrusion 12.
When engaged, the state shown in FIG. 2A is achieved, and further reverse rotation is prevented and the torque is maintained.

In other words, even if the hand that gives the coil spring its initial winding is released, the coil spring retains its initial winding.

When the coil spring device of the present invention is attached to one end of the cloth winding pipe of a roll screen and the raw cloth is to be rolled up and unwinded, the end of the locking member 7 that protrudes from one end of the raw cloth winding pipe is When attaching the cloth winding pipe to the bracket 3, if the raw cloth winding pipe is rotated and pushed in the direction of the bracket 3, the protrusion 12 of the locking member 7 will be in the state shown in FIGS. The protrusion 12 of the locking member 7 is completely housed in the locking member 9a, and functions as a normal coil spring device.

[Effect of idea]

According to the present invention, after assembling the roll screen at the factory, as described above, the coil spring built into the raw cloth winding pipe is wound with the optimum strength for the first time, and in that state, the first winding is performed. hold. If shipped in this state, a roll screen with the optimum initial winding can be obtained by mounting the roll screen at a desired position and releasing the holding state at the site.

As described above, according to the present invention, the initial winding, which conventionally required extremely difficult work, can be accomplished on site without any problems, and the roll screen can be rolled simply by attaching the roll screen and releasing the lock. An initial winding of optimal strength about the screen is obtained.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing one embodiment of the coil spring device according to the present invention, Fig. 2 A, B, and C are sectional views explaining the operation of the coil spring device shown in Fig. 1, and Fig. 3 is a A partially cutaway front view showing the coil spring device mounted on the roll screen, and FIGS. 4 and 5 are sectional views showing modifications of the coil spring device. 1...Raw cloth, 2...Raw cloth winding pipe, 3, 4...
... Bracket, 5 ... Coil spring device, 6
...Mandrel, 7...Locking member, 8...Fixing member, 9
... Drive ring, 10 ... Bearing, 11 ... Cylindrical body, 13
...Coil spring, 14...Stopper.

Claims (1)

[Scope of utility model registration request] A drive ring is rotatably attached to one end of the mandrel, one end of a coil spring is fixed to the drive ring, and the other end is fixed to the other end of the mandrel, and the drive ring is attached to the inner wall of the cloth winding pipe. and fixedly connects the end of the mandrel protruding from the drive ring to a support that pivots the cloth winding pipe, and applies a load to the coil spring. In a coil spring device, a protrusion is formed near the protruding end of the mandrel, protruding in the radial direction and having a tapered portion on one side and a stepped portion on the other side, and a protrusion on the drive ring. A coil spring device for a roll screen, wherein a protrusion is provided to engage with the stepped portion of the protrusion, and the drive ring is mounted so as to be movable by a fixed distance relative to the axial direction of the mandrel.