JPH0435879Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a device for applying an initial winding to a coil spring built into a raw cloth take-up roll of a roll screen.

[Background of the idea]

A roll screen is equipped with a coil spring that always works in the direction of winding up the raw cloth in the roll that winds up the raw cloth, and when the raw cloth is pulled down, an appropriate stopper is used to resist the force of the coil spring and roll the raw cloth. is stopped at a desired position, and when the cloth is to be pulled up, the stopper is released, and the cloth is wound up by the force of the coil spring. In such a roll screen, when the roll screen is mounted on a bracket attached to the ceiling or wall, an initial winding must be applied to the coil spring built in the raw cloth winding roll. However, after the roll screen is attached to the bracket, it is extremely difficult to apply the first winding to the coil spring built into the raw cloth take-up roll.
Generally speaking, it is a cumbersome process that involves first winding the coil spring built into the raw cloth take-up roll, holding the coil spring in that state, and then releasing the hold on the coil spring after attaching it to the bracket. A lot of work is required.

[Purpose of invention]

An object of the present invention is to provide an initial winding device for a coil spring that allows the initial winding of the coil spring to be applied extremely easily after the roll screen is mounted on the bracket.

[Summary of the idea]

The present invention is a device for applying an initial winding to a coil spring built into a raw cloth winding roll of a roll screen, in which an initial winding drum is rotatably attached to one end of the raw cloth winding roll, and the raw cloth winding roll is One end of the coil spring is locked in the roll, and the other end of the coil spring is locked to a shaft that rotates in conjunction with the first winding drum, and a plurality of coil springs form a circular row on the end surface of the drum and protrude in the axial direction. an operating ring in the form of a C-shaped ratchet that engages around the pawl and is non-rotatably attached to the bracket so that the drum is rotated only in the initial winding rotation direction; It is characterized by providing a clutch spring inscribed in the clutch receiving drum, which contracts when rotated from the initial winding drum side and expands when rotated from the shaft side.

[Example of idea]

This will be explained below with reference to the drawings.

Fig. 1 shows a roll screen equipped with an initial winding device according to the present invention, and Fig. 2 shows an enlarged view of its end. , 3 indicates a bracket that supports the raw cloth winding roll. In roll 2,
It has a built-in coil spring 4 that always works in the direction of winding up the cloth. One end of the coil spring 4 is fixed to a drum 5 fixed to the inner wall of the cloth take-up roll 2, and the other end is fixed to a drum 7 (FIG. 3) fixed to the end of the mandrel 6. The opposite end of this mandrel projects to the left (in FIGS. 1 and 2) through an opening in the center of the drum 5, and has a square shaft 8 at its tip. A shaft 9 having a square hole that engages with this shaft 8 is connected to the shaft 8, and this shaft 9
passes through a hole in the center of the initial winding drum 10 and projects to the left (FIG. 2).

A clutch receiving drum 11 is mounted on the bracket 3 so as not to rotate, and a clutch spring 12 is arranged on the inner surface of the drum, with both ends 12a and 12b of the clutch spring 12 projecting inward of the drum. (See Figure 5). At the end of the shaft 9, there is a fan-shaped clutch operating portion 9a (FIGS. 3 and 5) having a surface that comes into contact with the ends 12a and 12b of the clutch spring.
are integrally formed, and the initial winding drum 10
5, there is a fan-shaped clutch operating portion 10b protruding between the ends 12a and 12b of the clutch spring (FIG. 5).
are integrally formed. In this clutch spring device, when the initial winding drum 10 is rotated (in any direction), the clutch actuating portion 10b is connected to the end 12a or 12b of the clutch spring.
The initial winding drum 10 can rotate freely in order to work in the direction of compressing the clutch spring by pressing .
When a rotational force is applied to the shaft 9, the clutch actuating portion 9a pushes the end portion 12a or 12b of the clutch spring and acts in the direction of expanding the clutch spring.
The clutch spring 12 is pressed against the inner surface of the clutch receiving drum 11 to prevent rotation of the shaft 9.

Initial winding drum 10 and clutch receiving drum 1
1 in a connected state (see FIG. 2), a plurality (four in the illustrated example) of claw-shaped protrusions 10a protruding from the end surface of the first winding drum 10 are provided. However, with respect to the initial winding drum 10, the initial winding direction (clockwise in FIG. 4)
The above-mentioned protrusion 10 so as to transmit rotational force only to
An operating ring 13 is provided in the form of a C-shaped ratchet that engages around a. Head 13a of operation ring 13
The actuating surface 13b is arranged to engage and push the protrusion 10a when the operating ring is manually rotated in the direction of applying the initial winding, and the actuating surface 13b is arranged to ride over the protrusion 10a when the operating ring is rotated in the opposite direction. A sliding surface 13c is formed. In addition, the operation ring 13
The tail portion 13d has an operating surface 13e arranged to engage and push the protrusion 10a when the operating ring is manually rotated in the initial winding direction, and an operating surface 13e disposed to engage and push the protrusion 10a when the operating ring is rotated in the opposite direction. A sliding surface 13f is formed so as to cross over the sliding surface 13f.

In the above structure, when the coil spring 4 is to be wound for the first time, the operating ring 13 is rotated repeatedly from side to side by hand. As described above, when the operating ring 13 is rotated in the initial winding direction, it pushes the protrusion 10a to rotate the initial winding drum 10, but when the operating ring is rotated in the opposite direction, the protrusion 1
It slides on 0a and does not transmit rotational force to the drum 10. In this case, the clutch spring 12
When a rotational force is applied to the first winding drum 10, the first winding drum 10 is rotated, and the shaft 9 is rotated via the clutch actuating part 10b, the clutch spring 12, and the clutch actuating part 9a. 6 and rotates it to give the coil spring 4 its initial winding. However, the coil spring 4 given the initial winding as described above applies a rotational force to the mandrel 6 in the direction of reversing it, but as described above, it tries to rotate the shaft 9 connected to the mandrel 6. However, since this rotation is prevented by the action of the clutch spring 12, the initial winding applied to the coil spring 4 by the initial winding drum 10 does not come undone.

As described above, in the illustrated device, the coil spring 4 can be given an initial winding by repeatedly rotating the operating ring 13 left and right.
In FIG. 3, reference numeral 14 indicates a clutch receiving drum mounting device for easily attaching the clutch receiving drum 11 to the bracket 3, but since this is not relevant to the present invention, its explanation will be omitted.

[Effect of idea]

As mentioned above, in the coil spring initial winding device according to the present invention, after the roll screen is mounted in a predetermined position with the bracket, the coil can be rolled with an extremely simple operation by repeatedly rotating the operation ring. An initial winding can be applied to the spring.

[Brief explanation of the drawing]

Fig. 1 is a front view of a roll screen equipped with an initial winding device according to the present invention, Fig. 2 is an enlarged sectional view of the end portion thereof, and Fig. 3 is an exploded perspective view showing one embodiment of the device of the present invention. 4 is a sectional view taken along the - line in FIG. 2, and FIG. 5 is a sectional view taken along the - line in FIG. 1... Raw cloth, 2... Raw cloth winding roll, 3... Bracket, 4... Coil spring, 5... Drum, 6... Mandrel, 7... Drum, 8... Shaft, 9...
... shaft, 10 ... initial winding applying drum, 10a ... protrusion, 11 ... clutch receiving drum, 12 ... clutch spring, 13 ... operating ring, 14 ... clutch receiving drum mounting device.

Claims (1)

[Scope of utility model registration request] In a device for applying an initial winding to a coil spring built into a raw cloth take-up roll of a roll screen, an initial winding drum is rotatably attached to one end of the raw cloth take-up roll, and one end is placed inside the raw cloth take-up roll. The other end of the coil spring that is locked is locked to a shaft that rotates in conjunction with the first winding drum, and a plurality of claws that form a circular row and project in the axial direction are provided on the end surface of the drum. An operating ring in the form of a C-shaped ratchet that engages around the pawl is provided so that the drum is rotated only in the initial winding rotation direction, and a clutch receiving drum that is non-rotatably mounted on the bracket is provided with an operating ring in the form of a C-shaped ratchet that engages around the pawl. The first winding of a coil spring built into the raw cloth take-up roll of a roll screen characterized by a clutch spring that is inscribed and contracts when rotated from the first winding drum side and expands when rotated from the shaft side. Device.