JP2629061B2 - Roll blind screen lifting device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for raising and lowering a screen of a roll blind.

[Conventional technology]

Conventionally, as one type of a lifting device for raising and lowering a roll blind, a torsion coil spring is provided in a winding shaft for suspending and supporting a screen, and an operation knob is suspended and supported substantially at the center of a bottom bar attached to a lower edge of the screen. In some cases, the screen is lowered by lowering the operation knob. A stop device for suspending and supporting the screen at a desired lowering position is provided in the winding shaft. The stop device is released by slightly lowering the operation knob, and the winding shaft is turned into a torsion coil. The screen is rotated in the screen winding direction by the force of the spring and the screen is wound up to the upper limit.

[Problems to be solved by the invention]

However, in the above-described elevating device, when the bottom bar reaches near the foot of the operator when the screen is pulled out to the lower limit, it is necessary to squeeze the operation knob attached to the bottom bar and perform the operation. There was a problem that it was complicated. In order to stop the screen in the middle of raising, it is necessary to raise the screen while holding the operation, and to lower the screen at a desired position with a stroke larger than the release operation of the stop device, which operation is complicated. There is also a problem.

The present invention has been made in order to solve the above-described problems, and the object thereof is to perform a screen winding operation without lowering the operation knob, in a roll blind in which an operation knob is suspended and supported on a bottom bar, It is an object of the present invention to provide a screen raising / lowering device of a roll blind which can easily stop the raising of the screen in the middle.

[Means for solving the problem]

In order to achieve the above object, in the present invention, a screen is hung from a hollow winding shaft rotatably supported between support brackets, and a bottom bar is attached to a lower end of the screen, and the bottom bar is attached to the screen. The winding shaft is provided with a torsion coil spring that rotates the winding shaft in the screen pulling direction, and the winding shaft is always provided at one end of the winding shaft by the torsion coil spring. In a roll blind provided with a stop device for preventing rotation of the take-up shaft and rotating the take-up shaft in the screen pulling-up direction based on the release operation, the stop device is provided at the end of the take-up shaft in the take-up shaft. A first rotating body provided on the portion and rotating integrally with the winding shaft; and a second rotating body rotatable with respect to the first rotating body within the winding shaft. Body, and is provided between the first rotating body and the second rotating body and is always pressed against the first rotating body to prevent rotation of the first rotating body due to the accumulated force of the torsion coil spring; A brake spring that releases friction with the first rotating body by rotating the screen and rotates the first rotating body, and a protruding portion provided on the second rotating body and exposed to the outside of the winding shaft. An operation string is suspended and supported on the protruding portion, and the operation string is pulled down, so that the second
Are rotated in a direction to release the friction between the first rotator and the brake spring.

[Action]

Therefore, according to the present invention, when the bottom bar is lowered,
The friction between the first rotating body that rotates integrally with the winding shaft and the brake spring is released, and the first rotating body becomes rotatable with respect to the brake spring. Of the torsion coil spring is stored. When the lowering of the bottom bar is stopped, the brake spring is pressed against the first rotating body by the rotational force of the winding shaft in the screen pulling-up direction due to the accumulated force of the torsion coil spring, and the rotation is prevented. When the operation cord suspended and supported by the projection of the second rotating body rotatable with respect to the first rotating body is lowered to rotate the projection and the second rotating body, the first rotation is performed. The friction between the body and the brake spring is released, the first rotating body becomes rotatable with respect to the brake spring, and the winding shaft is rotated in the screen pulling direction by the accumulated force of the torsion coil spring.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In the roll blind shown in FIG. 3, a take-up shaft 3 is rotatably supported between a pair of support brackets 1 and 2 fixed to an upper frame or the like of a window, and a screen 4 is suspended and supported on the take-up shaft 3. Have been. At the bottom of the screen 4 is a bottom bar 5
The screen 4 is tensioned downward by the weight of the bottom bar 5. An operation knob 6 is suspended and supported substantially at the center of the bottom bar 5, and the screen 4 can be lowered by pulling down the operation knob 6. or,
A torsion coil spring 7 is disposed inside one end of the winding shaft 3, one end of which is fixed to the winding shaft 3 via a wind plug 8, and the other end is fixed to one support bracket 2 via a supporting member 9. Have been. When the winding shaft 3 is rotated in the downward direction of the screen 4, the torsion coil spring 7 is charged, and a rotational force in the screen 4 pulling-up direction is applied to the winding shaft 3 by the accumulated force. I have. Further, a stop device 10 for preventing rotation of the winding shaft 3 due to the accumulated force of the torsion coil spring 7 is provided inside the other end of the winding shaft 3, and an operation cord 11 is provided at one end of the stop device 10.
Are suspended and supported.

Next, the detailed structure of the stop device 10 will be described. As shown in FIG. 1, an operation cap 12 is fitted on the inner peripheral surface of one end of the winding shaft 3, and the operation cap 12 is
, A rotating cylinder 13 as a first rotating body is fixed, and the operation cap 12 and the rotating cylinder 13 rotate integrally with the winding shaft 3. A support shaft is provided on the convex portion 1a of the support bracket 1.
A concave portion 15a formed at the distal end portion 15 of 14 is fitted, whereby the support shaft 14 is non-rotatably supported by the support bracket 1. The operation cap 12 and the rotating cylinder are attached to the support shaft 14.
13 is rotatably supported, and the winding shaft 3 rotates around a support shaft 14.

A clutch drum 16 is rotatably supported by the support bracket 1, and its base end serves as a transmission unit 17 as a second rotating body, and the operation cap 12 and a tip 13 a of a rotary cylinder 13 are provided.
And a tip 19 as a protruding portion is located between the support bracket 1 and the winding shaft 3. Also, rotating cylinder 13
The outer circumference of the distal end 13a of the rotary cylinder 13 and the outer circumference of the distal end 15 of the support shaft 14 have the same diameter, and the distance between the distal end 13a of the rotary cylinder 13 and the transmission portion 17 of the clutch drum 16 Tip 13
a and the brake spring 1 fitted to the tip 15 of the support shaft 14
Eight are arranged. Then, as shown in FIG. 2, one end 18a of the brake spring 18 is bent in the radial direction, and the end 18a is fitted in a locking groove 17a formed in the transmission portion 17. The other end 18b of the brake spring 18 is bent in the axial direction, and the end 18b is fixed to the support bracket 1. When the transmission portion 17 of the clutch drum 16 is rotated in the downward direction of the screen 4, that is, in the direction of arrow B shown in FIG. 2, the brake spring 18 is expanded in diameter and the frictional force with the tip 13 a of the rotary cylinder 13 is reduced. Drop,
The rotating cylinder 13 can rotate with respect to the brake spring 18. Also, even if a rotating force in the downward direction of the screen 4 acts on the rotating cylinder 13, the brake spring 18 is expanded,
13 is rotated with respect to the brake spring 18. Then, when a rotating force in the upward direction of the screen 4, that is, the direction of the arrow C shown in FIG.
As the diameter of the brake spring 18 is reduced, the frictional force with the tip 13a of the rotary cylinder 13 increases, and the brake spring 18
Are firmly pressed against the distal end 13a of the rotary cylinder 13 and the distal end 15 of the support shaft 14. The operation string 11 is suspended and supported on the outer peripheral surface of the distal end portion 19 of the clutch drum 16, and when the operation string 11 is pulled down, the clutch drum 16 moves in the downward direction of the screen 4, that is, in the direction of arrow B shown in FIG. It is designed to be rotated.

Next, the operation of the roll blind configured as described above will be described.

Now, when the operation knob 6 is lowered to lower the screen 4, a rotational force acts on the rotary cylinder 13 via the winding shaft 3 and the operation cap 12 in the direction of arrow B shown in FIG.
As a result, the diameter of the brake spring 18 is expanded,
Since 13 can rotate with respect to the brake spring 18,
The winding shaft 3 is rotated in the direction of arrow B, and the screen 4 is lowered. At this time, the torsion coil spring 7 is charged by the rotation of the winding shaft 3.

When the operation knob 6 is released after the screen 4 has been lowered to a desired position, a rotational force in the direction of arrow C acts on the rotary cylinder 13 via the winding shaft 3 and the operation cap 12 due to the accumulated force of the torsion coil spring 7. . Then, the brake spring 18 is firmly pressed against the distal end portion 13a of the rotary cylinder 13 and the distal end portion 15 of the support shaft 14 to reduce the diameter, and the rotary cylinder 13 becomes unrotatable, so that the rotation of the winding shaft 3 is prevented. Then, the screen 4 is suspended and supported at a desired position.

In this state, pull down the operation cord 11 slightly to release the clutch drum.
When the rotary member 16 is rotated in the direction of arrow B, the rotational force is transmitted to the end portion 18a of the brake spring 18 via the transmitting portion 17 of the clutch drum 16, whereby the brake spring 18 is rotated.
Since the diameter of the rotary shaft 13 is enlarged and the rotary cylinder 13 becomes rotatable with respect to the brake spring 18, the winding shaft 3 is rotated by the accumulated force of the torsion coil spring 7 and the screen 4 is wound up. When the operation cord 11 is released during the ascent of the screen 4, the rotation of the rotary cylinder 13 due to the accumulated force of the torsion coil spring 7 causes the brake spring 18 to be reduced in diameter again, and the distal end 13a of the rotary cylinder 13 and the support shaft 14 are rotated. Is firmly pressed against the tip 15 of the rotating shaft 13 so that the rotating cylinder 13 cannot rotate.
Is stopped and the screen 4 is suspended and supported during the ascent.

As described above, this lifting device lowers the operation knob 6 suspended and supported by the bottom bar 5 to thereby rotate the rotary cylinder 13.
Is rotatable with respect to the brake spring 18 so that the screen 4 can be lowered, and when the winding shaft 3 is rotated in the ascending direction of the screen 4 by the accumulated force of the torsion coil spring 7, the brake spring 18 is rotated by the rotating cylinder 13 and The screen 4 can be suspended and supported at a desired lowering position since the rotation is prevented by being pressed against the support shaft 14.
By slightly lowering the operation cord 11 hanging from the clutch drum 16, the rotating cylinder 13 is
The winding shaft 3 is rotatable with respect to 18, and the winding shaft 3 is rotated in the upward direction of the screen 4 by the accumulated force of the torsion coil spring 7. Therefore, the operation of winding the screen 4 can be easily performed by only slightly pulling down the operation cord 11 hanging from the clutch drum 16 without having to pull down the operation knob 6 suspended from the bottom bar 5 one by one. The lifting of the screen 4 can be easily stopped halfway just by releasing the string 11. Further, since the stop device 10 is provided inside the winding shaft 3, the entire roll blind does not become large.

〔The invention's effect〕

As described in detail above, the present invention can be easily performed when the operation of winding the screen is performed by only slightly lowering the operation cord hanging from one end of the winding shaft without lowering the bottom bar. By simply letting go of the operation cord, the ascending of the screen can be easily stopped halfway. In addition, since the stop device is housed in the winding shaft, the winding shaft and the bracket do not become too far apart from each other, and exhibit an excellent effect that the appearance is good.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view showing an embodiment of a screen raising / lowering device for a roll blind embodying the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. It is a partially broken front view shown. Support brackets 1, 2, winding shaft 3, screen 4, bottom bar 5, operation knob 6, torsion coil spring 7, stop device 10, operation cord 11, rotating cylinder 1 as first rotating body
3, a transmission part 17 as a second rotating body, a tip part 19 as a protruding part, and a brake spring 18.

Claims (1)

(57) [Claims] 1. A screen (4) is suspended from a hollow take-up shaft (3) rotatably supported between support brackets (1, 2), and a bottom bar (5) is provided at a lower end of the screen (4).
The screen (4) is lowered by pulling down the bottom bar (5), and the winding shaft (3)
A torsion coil spring (7) for rotating the take-up shaft (3) in the screen (4) pulling-up direction is provided inside the take-up shaft (3). (3) A roll blind provided with a stop device (10) that prevents rotation of the take-up shaft (3) in the pulling-up direction of the screen (4) based on a release operation of the stop device. A first rotating body (13) provided at an end of the winding shaft (3) in the winding shaft (3) and rotating integrally with the winding shaft (3).
And the first rotating body (1) in the winding shaft (3).
3) a second rotating body (17) rotatable with respect to the first rotating body (13), which is provided between the first rotating body (13) and the second rotating body (17). ) To prevent the rotation of the first rotating body (13) due to the accumulated force of the torsion coil spring (7), and the friction with the first rotating body (13) is reduced by the lowering operation of the screen (4). A brake spring (18) that is released and rotates the first rotating body (13); and a protruding part (19) provided on the second rotating body (17) and exposed to the outside of the winding shaft (3). An operation string (11) is suspended and supported on the protruding portion (19), and the operation string (11) is pulled down, so that the second rotating body (1
7) is the first rotating body (13) and the brake spring (1).
8) A screen raising / lowering device for a roll blind, characterized in that it rotates in a direction to release friction with the screen.