JPH0725437Y2 - Roll blind withdrawal length control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an improvement of a screen drawing length control device for roll blinds, and more particularly to a device suitable for roll blinds for skylights and inclined windows. .

[Prior Art] Roll blinds installed on skylights or inclined windows
It is known from 60-26595 and 60-26596. The known roll blind is a support bar attached to one side of the window, left and right brackets attached to both ends of the support bar, a roll pipe supported by the bracket, and a roll pipe wound around the roll pipe. The screen, the spring that rotates the roll pipe in the direction to wind the screen, the weight bar attached to the free end of the screen, the left and right wire bases attached to the opposite ends of the window, and the left and right wires. A screen opening / closing cord that has one end fastened to one of the bases, penetrates the weight bar in the axial direction, reaches the other wire base, and is further pulled out from the wire base, and a hanging tool that hooks the screen opening / closing cord. The left and right wire fasteners provided near both sides of the It consists of a guide wire that penetrates the weight bar in the string direction and reaches the left and right wire bases and is fixed there.When the screen opening / closing cord is pulled against the spring, the weight bar is guided by the guide wire and the screen is When the screen is pulled out from the roll pipe, the screen is pulled out until the weight bar hits the wire base, then the roll blind is closed by hooking the screen opening / closing cord to the hook, and the screen opening / closing cord is removed from the hook and released, and the screen springs. Will automatically wind the roll pipe and open the blinds.

[Problems to be solved by the invention] When the screen is pulled out and the roller blind is closed,
The screen is stretched by the elastic repulsive force of the spring, but the elastic repulsive force of the spring must be increased in order to make the slackness due to the weight of the screen inconspicuous. When the width of the screen is narrow and the draw-out length is short, the spring resilience to make the slack in the screen less noticeable is not so strong, but as the width of the screen becomes wider or the draw-out length becomes longer, the spring elasticity becomes stronger. If the repulsive force is increased to make the slack in the screen inconspicuous, the spring elastic repulsive force is too strong, and the operation of pulling out the screen becomes significantly heavy.

Therefore, we installed a screen withdrawal length control device that stops the weight bar before the lower limit position, cut the edge with the winding spring, and from there extend the screen with the screen opening and closing cord to the lower limit position where the weight bar comes into contact with the wire base. Invented to move. As disclosed in Japanese Patent Laid-Open No. 48-79068, the screen withdrawal length control device prevents the rotation of the roll pipe by contacting a stopper with a roller that rotates with the roll pipe on a spiral shaft provided in the roll pipe. By stopping, the draw-out length of the screen is regulated. However, in the conventional device, the top always moves at a constant pitch and hits the stopper, so that the top and the claw of the stopper are often engaged with each other in a shallow manner. If you pull the screen strongly in this state, the top and the claw of the stopper will be damaged.

The present invention has been made to solve this problem.The purpose of the present invention is to break the screen even if the screen is strongly stretched after the roll pipe is stopped by engaging the top of the screen draw-out length control device with the stopper. An object of the present invention is to provide a screen drawer length control device that does not cause

[Means for Solving the Problems] In order to achieve the above-mentioned object, the means adopted by the present invention is
As shown in the illustrated embodiment, a spiral groove 15 is formed on the peripheral surface of a fixed shaft 13 extending along the axis of the roll pipe 10, and a pullout stopper 22 is fixed to one side of the spiral groove and rotated together with the roll pipe. Move the top of the spiral groove and fix the top 16 to the fixed shaft.
In the device to be fitted in 13, the top 16 and the drawer stopper
22. Interlocking annular pawls 25 and 26 are formed on the end faces of the two adjacent to each other, and a projection 19 that fits in the spiral groove 15 is formed on the inner peripheral surface of the top 16, and the end of the spiral groove 15 in which the top 16 engages with the drawer stopper 22. The enlarged pitch portion 15a for accelerating the top 16 is provided in a portion. After engaging the top 16 with the drawer stopper 22, the expansion pitch part is used to prevent the top 16 from moving in the axial direction.
It is desirable that the zero pitch portion 15b extending only in the circumferential direction be continued to 15a to terminate the spiral groove.

[Operation] When the screen 20 is pulled out by a predetermined length, the top 16 engages with the pull-out stopper 22. At this time, the top 16 has the spiral groove 15
The ring-shaped pawl 25 of the top 16 is always deeply engaged with the ring-shaped pawl 26 of the drawer stopper 22 because it is accelerated by the enlarged pitch portion 15a. Therefore, after the rotation of the roll pipe 10 is stopped, even if the screen 20 is strongly pulled, the annular claws 25 and 26 are deeply engaged with each other, and there is no possibility of chipping. Enlarged pitch section 15a
If there is a zero pitch portion 15b that extends only in the circumferential direction, the protrusion 19 of the top 16 enters the zero pitch portion 15b, and the force for stretching the screen 20 does not act on the protrusion 19.
There is no risk of damage to 19.

[Embodiment] An apparatus of the present invention will be described based on an embodiment shown in the drawings.

As shown in FIG. 1, a fixed shaft 13 is supported by one bracket 11 of a roller blind so as not to rotate, and an end block 14 of a roll pipe 10 is rotatably fitted to the fixed shaft via a bearing. . The fixed shaft 13 extends on the axial center of the roll pipe 10, and a spiral groove 15 is provided on the outer peripheral surface thereof. A fixed shaft guide 21 is attached to one side of the spiral groove 15, and a drawer stopper 22 is attached to the fixed shaft 13 on the opposite side via pins 23 and 24, respectively, and a top 16 is fitted to the fixed shaft 13 between them. A protrusion 19 that engages with the spiral groove 15 is provided on the inner circumference of the top 16. An outer peripheral groove 18 is provided on the outer peripheral surface of the top 16, and the outer peripheral groove fits into the inner peripheral protrusion 17 of the roll pipe 10. A screen 20 is wound around the roll pipe 10, and when the roll pipe 10 rotates to one side, the screen 20 is rewound. Also, the roll pipe 10 rotates to the other side and the screen 20
When the hoist is wound up, the top 16 moves on the fixed shaft 13 and the fixed shaft guide 21
Move to the side. When the screen 20 is pulled out in reverse,
The top 16 moves to the drawer stopper 22 side.

As shown in the development view of FIG. 2, the spiral groove 15 advances from the fixed shaft guide side to the drawer stopper side at an equal pitch, but the pitch becomes large at the end portion on the drawer stopper side.
Zero pitch part 15b where the pitch becomes 0 after that
Is followed by the end.

As shown in FIG. 3, the end surface of the top 16 on the winding stopper side is flat, but the end surface on the drawer stopper side is 8 degrees with an inclination angle of 30 degrees.
It is formed as a piece of annular pawl 25. Further, two protrusions 19 that fit into the spiral groove are provided on the inner peripheral surface in the diametrical direction. Eight annular pawls 26 that engage with the annular pawls of the top are provided on the top end surface of the drawer stopper 22.

As shown by the solid line in FIGS. 2 and 4, when the protrusion 19 of the top is just before entering the enlarged pitch portion 15a from the equal pitch portion of the spiral groove 15, the tip of the annular pawl 25 of the top 16 and the pullout stopper 22. Although the tips of the annular claws 26 are separated from each other, when the protrusion 19 is completely inserted into the enlarged pitch portion 15a as shown by the alternate long and short dash line, the top 1
6 and the annular pawls 25 and 26 of the drawer stopper are deeply engaged.

Next, the regulation of the screen drawing length by the device of the present invention will be described.

As shown in FIGS. 5 and 6, the support bar 30 is fixed to one side of the window 50, and the left and right brackets 11 are attached to both ends of the support bar 30.
Mounted on the roll pipe 10 by its bracket
Is rotatably supported, and a spring (not shown) for rotating the roll pipe in the winding direction of the screen is provided in the roll pipe. A weight bar 35 is attached to the free end of the screen 20. A wire base 38 is fixed to the left and right ends on the opposite side of the window 50 via a plate 39, and one end of a screen opening / closing cord 33 is fixed to one wire base. The screen opening / closing cord 33 penetrates the weight bar 35 in the axial direction to reach the other wire base 38, is further pulled out from the wire base 38, passes through the guide 37, and the hook 32.
Is hung on. A wire fastening tool 36 for fastening one end of the guide wire 31 is attached near the left and right ends of the support bar 30. The guide wire 31 penetrates the weight bar 35 in the chord direction to reach the wire base 38, and the other end is fixed to the tension adjusting bolt 54. When you pull the screen open / close cord, the weight bar 35 moves from one side of the window 50 to the other side,
Is drawn from the roll pipe 10. When the screen 20 is pulled out from the wire base 38 to a position before a predetermined distance,
As shown in FIG. 1, since the top 16 engages with the pull-out stopper 22, the roll pipe 10 cannot rotate and the screen 20 cannot be further unwound. From this position, pull the screen open / close cord 33 strongly to stretch the screen 20, and after applying the weight bar 35 to the wire base 38,
Hang the screen opening / closing cord 33. This way
Since the screen 20 is tensioned by the tension caused by stretching, the slackness due to its own weight is not noticeable. When the top 16 is engaged with the drawer stopper 22, the top 16 is
Since it is accelerated by the enlarged pitch portion 15a, the ring-shaped claw of the top engages with the ring-shaped claw of the drawer stopper at a predetermined depth.
Therefore, even if the screen is pulled strongly, there is no possibility that both annular claws will be damaged. At this time, since the top protrusion 19 is in the zero pitch portion 15b, the force for pulling the screen is equal to the protrusion 1
It does not act on 9 and damage it.

Needless to say, the device of the present invention is not limited to a roll blind for a skylight or a tilted window, but can be used for an ordinary roll blind that is vertically opened and closed.

[Advantages of the Invention] As described above, the device of the present invention, when the screen is pulled out, rotates with the roll pipe and advances along the spiral groove to engage the stopper. Unlike those that engage, the top is accelerated and engages the stopper, so the jaws of the top and the stopper always engage deeply. Therefore, when the screen is strongly pulled after the roll pipe is stopped, unlike the conventional one, there is an excellent effect that the shallowly engaged top and the stopper claw are not damaged. Further, after the engagement between the top and the stopper, the protrusion is in the spiral groove of the zero pitch portion, so that the force to rotate the roll pipe does not act on the protrusion. Therefore, there is no possibility that the projection is damaged by the force of stretching the screen.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an apparatus according to an embodiment of the present invention, FIG. 2 is a development view of the spiral groove of FIG. 1, a top and a second stopper, and FIG. 3 is a top and a drawer stopper. FIG. 4 is a sectional view, FIG. 4 is a development view of a ring and an annular pawl of a drawer stopper, and FIGS. 5 and 6 are a perspective view and a side view of a roller blind provided with the device of FIG. In the figure, reference numeral 10 is a roll pipe, 11 is a bracket,
13 is a fixed shaft, 15 is a spiral groove, 15a is an enlarged pitch part, 15b is a zero pitch part, 16 is a top, 17 is an inner peripheral protrusion, 18 is an outer peripheral groove,
19 is a protrusion, 20 is a screen, 22 is a drawer stopper, 25,
26 is an annular claw, 35 is a weight bar, and 50 is a window.

Claims (2)

[Scope of utility model registration request] 1. A left and right bracket (11), a fixed shaft (13) supported by one of the left and right brackets, a roll pipe (10) rotatably fitted to the fixed shaft, and the roll pipe. A screen (20) wound around the screen, and a weight bar (35) attached to the free end of the screen,
A device comprising a screen opening / closing cord (33) capable of pulling down the weight bar, wherein the fixed shaft is extended inside the roll pipe and a spiral groove (15) is provided on an outer peripheral surface thereof. A pull-out stopper (22) is attached to one end of the spiral groove, a top (16) is externally fitted to the spiral groove, and a projection (19) fitted to the spiral groove is provided on the inner peripheral surface of the top. Outer peripheral grooves (18) engaging with the inner peripheral protrusions (17) of the roll pipe are respectively provided on the outer peripheral surface, and the top is rotated together with the roll pipe and moved on the spiral groove, and the top (16) and A plurality of annular claws (25, 26) that engage with each other are provided on the end faces of the drawer stopper (22) that are in contact with each other, and the top is attached to the end portion of the spiral groove (15) that engages the drawer stopper. Enlarged pitch section to accelerate (1 5a) is provided, and is a device for regulating the length of drawers for roll blinds. 2. A zero pitch portion (15
The roll blind withdrawal length regulating device according to claim 1, wherein b) is provided.