JPH0126870Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a pulley device for a string-pulling roll blind.

If you bring the outer diameter of the roll blind string pulley closer to the inner diameter of the case, the string will be prevented from coming off the pulley, but if you do not remove the pulley,
The problem arises that the string cannot be replaced.

The object of the present invention is to provide a device equipped with a pulley having an outer diameter slightly smaller than the inner diameter of the case, which allows a string to be attached and detached without removing the pulley.

In order to achieve the above object, the device of the present invention is provided with a notch corresponding to the cross section of the string on the outer periphery of the pulley, and when the string is fitted into the notch and the pulley is rotated once, the string automatically attaches to and detaches from the pulley.

The apparatus of the present invention will be explained based on the embodiments shown in the drawings. As shown in FIG. 1, a bearing sleeve 3, an elastic plate 4, and a brake drum 5 are sequentially stacked and fixed to a bracket 1 via rivets 2. The inner periphery of the case 6 is rotatably fitted onto the flange-shaped rotating surface 3a of the bearing tube 3, and is held between the elastic plate 4 and the bracket 1. A rotating shaft 7 is fitted into the bearing sleeve 3, and a roll 9 around which a screen 8 is wound is fixed to the rotating shaft. A coil spring 10 is fitted to the brake drum 5, and a cap body 11 is fitted to the coil spring. The cap body 11 is integrally fixed to the rotating shaft 7, and the inner peripheral protrusion of the cap body 11 is inserted between the protrusions at both ends of the coil spring 10. A pulley 12 is fitted to the cap body 11 and rotated together, and a string 13 is hung on the pulley 12. Put the lid 14 on the case 6, and tighten the lid 1 with the screws 15.
4 to the case 6.

The pulley 12 is an annular ring 12a on which the string 13 is directly hung.
and a retaining ring 12b that holds the annular ring.
As shown in FIGS. 2 and 3, the annular ring 12a is made of two metal plates put together, and a notch 20 slightly larger than the cross section of the string 13 is provided in a part of its outer periphery.

As shown in FIG. 4, since the width of the space between the inner circumference of the case 6 and the outer circumference of the annular ring 12a is smaller than the diameter of the string 13, the string 13 can be pulled out from between the pulley 12 and the case 6 all around the circumference. You can't fit it in.

However, as shown in FIG. 5, when the notch 20 is turned downward, the string 13 is pulled out from the notch 20, and the pulley 12 is rotated once in the direction of the arrow, the string 13
will come off the pulley 12 naturally. Also, as shown in FIG. 6, the string 13 is hung on the notch 20 and
When the string 13 is rotated once in the direction of the arrow, the string 13 is automatically hooked onto the pulley 12. When the pulley 12 rotates in either direction, the protrusion of the cap body 11 integrated with the pulley loosens the coil spring 10 and prevents the braking action, so the pulley 12 can rotate freely.

As mentioned above, the pulley of the present invention has the advantage that the difference between its outer diameter and the inner diameter of the case is small, so the string does not come off the pulley during use. Unlike conventional models, it is possible to attach and remove the string while the pulley is attached, making the task of replacing the string significantly easier.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a main part of a roll blind equipped with a pulley device according to an embodiment of the invention, Figs. 2 and 3 are front and side views of the annular ring shown in Fig. 1, and Fig. 4
This figure is a front view of the pulley device shown in FIG. 1 with the lid removed, and FIGS. 5 and 6 are schematic diagrams showing a method for removing a string from a pulley and a method for attaching a string to a pulley, respectively. DESCRIPTION OF SYMBOLS 1... Bracket, 6... Case, 7... Rotating shaft, 11... Cap body, 12... Pulley, 12a... Annular ring, 12b... Holding ring, 13... String, 20...
...Notch.

Claims (1)

[Scope of utility model registration request] A pulley device comprising: a pulley that is rotatably provided on a rotating shaft of a roll blind; a case that is rotatably provided relative to the rotating shaft and surrounds the pulley; and a string that is hung on the pulley. is provided with two annular rings that sandwich the string, the inner diameter of the case is slightly larger than the outer diameter of the annular rings except for a part, and a notch into which the string fits is provided on the outer peripheral edge of the annular ring. A pulley device for a roll blind, which is characterized by being provided with a pulley device.