JPH0538236Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a screen winding force adjustment device for a roll blind.

(Prior Art) Conventionally, a support shaft is supported on a window frame or the like in a non-rotatable manner when the screen is pulled out or rolled up, and rotatably supported when the screen is rotated from the outside.
A winding shaft around which a screen is wound is rotatably supported, and a biasing means such as a torsion coil spring is disposed between the support shaft and the winding shaft, and the biasing force of the biasing means causes the winding shaft to An example of an adjustment device for adjusting the winding force of the screen in a roll blind where the screen is rolled up by rotating the support shaft while it is supported on the window frame etc.
It is disclosed in Publication No. 45597.

(Problem to be solved by the invention) However, the above-mentioned conventional screen winding force adjustment device has a brake drum 12 and a brake spring 1.
3. The sector 14, the adjustment ring 15, and the screw 17 connecting them are essential components (see Figure 2 of the above publication), and the number of parts is large.
There were problems in that the manufacturing cost was high and the assembly work was troublesome.

Further, in the above device, the adjustment ring 15 is positioned only by the spring force of the brake spring 13, so if the spring force of the brake spring 13 is weak or becomes weak over time, the adjustment ring will not rotate. There is a risk that the screen winding force will be inconsistent. On the other hand, if the spring force of the brake spring 13 is made strong, a very large force is required to rotate the adjustment ring 15, and
There was a risk that the protrusion 15a of the adjustment ring 15 would be damaged.

Structure of the invention (Means for solving the problems) In order to solve the above problems, the present invention is fixed to the mounting member at all times, and only when operated by the operating means that adjusts the screen winding force. A winding shaft is rotatably supported on a rotatably supported support shaft, a biasing means is interposed between the support shaft and the winding shaft, and the winding shaft is rotated by the biasing force of the biasing means. In a roll blind for rolling up a screen, the inner cylinder members 11, 23 and the outer cylinder members 14, 21 are rotatably fitted, and one of the inner cylinder members 11, 23 and the outer cylinder members 14, 21 is supported by the support. The inner cylinder members 11, 23 and the outer cylinder members 14, 21 are fitted to be movable only in the axial direction of the shaft 4, and the other is fixed to the mounting member 2, and one of the inner cylinder members 11, 23 and the outer cylinder members 14, 21 is fitted in the axial direction with respect to the support shaft 4. At least a portion of the movably fitted side is exposed to the outside so that it can be operated externally, and one of the outer peripheral surfaces of the inner cylinder members 11 and 23 and the inner peripheral surfaces of the outer cylinder members 14 and 21 has a Endless guide grooves 12 and 22 are provided in one direction, and locking pins 16 and 20 that protrude into the guide grooves 12 and 22 are provided on the other side. Communication and locking pin 1
A locking recess 13 is provided that removably engages with the locking pins 16 and 20, and when the locking pins 16 and 20 are engaged with the locking recess 13, the inner cylinder members 11 and 23 and the outer cylinder member 1
4 and 21 in a non-rotatable manner, and are locked by operating the side of the inner cylinder members 11 and 23 and the outer cylinder members 14 and 21 that are fitted so as to be movable in the axial direction with respect to the support shaft 4. This device employs a screen winding force adjustment device for a roll blind that can release the engagement state between the pins 16, 20 and the locking recess 13.

(Function of the device) When either the inner cylinder member or the outer cylinder member fitted to the support shaft is rotated by the above means, the locking pin moves within the guide groove, and the support shaft and the winding shaft are rotated. The biasing force of the biasing means interposed between the two is changed.
Then, when the locking pin is locked in the locking recess,
The urging force of the urging means is maintained constant.

(Example) An example embodying this invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, in the roll blind, brackets 2 as mounting members are fixed to both left and right ends of a frame 1 fixed to a ceiling surface W with screws 3, and a support shaft 4 is attached to the brackets 2. Both ends are rotatably supported only when operating a screen winding force adjustment device to be described later, and a winding shaft 5 is rotatably supported on the support shaft 4.
A torsion coil spring (not shown) and a clutch (not shown) are provided between the support shaft 4 and the winding shaft 5 as biasing means, and the support shaft 4 is always used as a fulcrum by the torsion coil spring. The winding shaft 5, to which a rotational force is applied in one direction, is prevented from rotating at a predetermined time by a clutch.

The upper end of a screen 6 made of cloth is fixed to the winding shaft 5, and when the winding shaft 5 is rotated by the biasing force of the torsion coil spring, the screen 6 is wound around the winding shaft 5. It's getting old. A bottom frame 7 is suspended from the lower end of the screen 6, and by pulling an operating string 8 suspended from the bottom frame 7 downward, the winding is performed on the winding shaft 5 against the urging force of a torsion coil spring. The screen 6 that is attached can be pulled out downward.

Next, the screen winding force adjusting device 9 provided on the bracket 2 on the right side in FIG. 2 will be explained. As shown in FIG. is provided. An inner cylinder member 11 is fixed to the side surface of the bracket 2 around the through hole 10,
A guide groove 12 of a constant width is provided on the outer peripheral surface of the inner cylinder member 11.
is formed endlessly around the entire circumference. The guide groove 12 has a locking recess 13 recessed toward the outside of the roll blind, that is, on the right side in the developed view of the outer peripheral surface of the inner cylinder member 11 shown in FIG. A total of three locations are provided at three equally divided positions, that is, at intervals of 120 degrees with respect to the axis of the inner cylinder member 11.

As shown in FIG. 1, the outer cylindrical member 14 that is slidably and rotatably fitted into the inner cylindrical member 11 has a threaded hole 15 on its outer peripheral surface relative to the axis of the outer cylindrical member 14.
A total of three locking pins 16 are provided every 120 degrees, and the tips of the locking pins 16 that are screwed into the screw holes 15 are the fifth.
As shown in the figure, it projects into the guide groove 12. Further, the outer circumferential surface of the outer cylinder member 14 is formed with irregularities to prevent slipping.

A fitting protrusion 17 is provided at the axial center of the outer cylinder member 14, and the support shaft 4 is provided at the center of the fitting protrusion 17.
A square hole 18 is formed to fit into the hole. As shown in FIG. 3, a coil spring 19 is disposed inside the inner cylinder member 11, and the coil spring 19 biases the outer cylinder member 14 in the direction of the arrow in FIG. 3 using the side surface of the bracket 2 as a fulcrum. There is.

Next, the operation of the screen winding force adjusting device 9 configured as described above will be explained.

Now, this roll blind screen winding force adjustment device 9 is designed to move the outer cylinder member 14 to the inner cylinder member 11.
and rotate each locking pin 16 into the locking recess 1.
3, the outer cylinder member 14 is stably held in that state by the biasing force of the coil spring 19, and in this state, the support shaft 4 fitted to the outer cylinder member 14 is engaged with the winding shaft 5. It is unrotatably supported regardless of the biasing force of the torsion coil spring in between.

From this state, use the operation string 8 to
When pulled downward, the winding shaft 5 is rotated in the direction of the arrow X in FIG. Therefore, the torsion coil spring is stored with energy. After lowering the screen 6 to a desired height, the screen 6 is slowly raised using the biasing force of the torsion coil spring, and the clutch is activated to hold the screen 6 at the desired position. In addition, if the screen is pulled slightly downward from this state, the clutch will be released, and if the operating string 8 is released in this state, the winding shaft 5 will move in the direction of the arrow Y in FIG. 1 due to the biasing force of the torsion coil spring. The screen 6 is rolled up.

In such a roll blind opening/closing operation, when increasing the winding force of the roll screen 6, the operator rotates the outer cylindrical member 14 to the left while holding the winding shaft 5 non-rotatably. The locking pins 16 of the cylindrical member 14 are moved in the direction of arrow A in FIG. 4 to lock each locking pin 16 in each of the following locking recesses 13. Then, as the outer cylinder member 14 rotates, the support shaft 4 is rotated, and the torsion coil spring is loaded and its biasing force becomes stronger. In this way, by arbitrarily rotating the outer cylinder member 14 to the left and sequentially locking the locking pins 16 in the locking recesses 13, the support shaft 4 is rotated and the screen is rolled up by the biasing force of the torsion coil spring. The force is adjusted accordingly.

On the other hand, in order to weaken the screen winding force, the outer cylinder member 14 is pressed toward the bracket 2 side against the biasing force of the coil spring 19 while the winding shaft 5 is held non-rotatably. Member 14
In other words, move the locking pin 16 to the left in the direction indicated by arrow B in Fig. 4.
the locking pin 16 in the locking recess 13
After that, remove the bracket 2 of the outer cylinder member 14.
The side pressure is released, the outer cylinder member 14 is rotated in the same direction, and the locking pin 16 is locked in the next locking recess 13. Then, as the outer cylindrical member 14 rotates, the support shaft 4 is rotated and the torsion coil spring is unwound in the loosening direction, weakening its biasing force, and in this way, the outer cylindrical member 14 can be rotated to an arbitrary position. If so, the biasing force of the torsion coil spring is adjusted, and the screen winding force is adjusted appropriately.

As described above, in the screen winding force adjusting device 9 of this embodiment, the guide groove 12 and the locking recess 13 are provided on the outer circumferential surface of the inner cylinder member 11 fixed to the bracket 2, and the inner cylinder member 11 is fixed to the bracket 2 in a state where it is biased by the coil spring 19. A locking pin 1 protruding into the guide groove 12 of the inner cylinder member 11 is attached to the outer cylinder member 14 fitted to the support shaft 4.
It is possible to have a simple structure with only 6 provided.

Also, in this adjustment, when the biasing force of the torsion coil spring is weak, the locking pins 16 are sequentially locked in the locking recesses 13 by rotating the outer cylinder member 14, and conversely, the biasing force of the torsion coil spring is reduced. If the force is strong, push the outer cylinder member 14 toward the bracket 2 to remove the locking pins 16 from the locking recesses 13, rotate the outer cylinder member 14, and sequentially move the locking pins 16 into the locking recesses 13.
All you have to do is lock it in place.

Note that the present invention is not limited to the above-described embodiment; for example, in the above-mentioned embodiment, a coil spring 24 is provided between the inner cylinder member 11 and the outer cylinder member 14, but an outer cylinder without the coil spring is provided. Cylindrical member 1
The locking pin 16 may be locked in the locking recess 13 by the operation in step 4. Further, in the above embodiment, the guide groove 12 and the locking recess 13 are provided in the inner cylinder member 11 and the locking pin 16 is made to protrude from the inner peripheral surface of the outer cylinder member 14. A groove 12 and a locking recess 13 are provided, and a locking pin 16 is provided on the outer peripheral surface of the inner cylinder member 11.
may be made to protrude. Further, the number of the locking recesses 13 of the guide groove 12 and the number of locking pins 16 that are locked in the locking recesses 13 is not limited to three, but may be two or four or more. Furthermore, in the above embodiment, the inner cylinder member 11 and the outer cylinder member 14 are arranged outside the bracket 2, but the inner cylinder member 11 and the outer cylinder member 14 are arranged inside the bracket 2, that is, at one side end of the winding shaft 5. and the bracket 2.

Further, in the above embodiment, the inner cylinder member 11 was fixed to the bracket 2 fixed to the ceiling surface W, and the outer cylinder member 14 was fitted to the support shaft 4, but as shown in FIG. The outer cylindrical member 21 with the pin 20 protruding is fixed to the bracket 2 in a non-rotatable manner, and the outer cylindrical member 21
The guide groove 22 and the inner cylindrical member 23 provided with a locking recess (not shown) on the left side of the guide groove 22 are inserted into the support shaft 4 while the locking pin 20 is inserted into the guide groove 22. A coil spring 24 is disposed between the outer cylinder member 21 and the inner cylinder member 23 to urge the inner cylinder member 23 to the right in the figure, and the operating section of the inner cylinder member 23 The screen winding force may be adjusted by rotating 25.

Effects of the invention As detailed above, this invention allows a screen winding force adjustment device to be configured by an inner cylinder member provided with a locking pin and a guide groove, and an outer cylinder member, compared to conventional devices. The number of parts is significantly reduced,
The manufacturing cost can be reduced and assembly work can be easily performed. Also,
By simply locking the locking pin in the locking recess, the urging force of the urging means interposed between the support shaft and the winding shaft can be reliably maintained at a constant level, making it easy to adjust the screen winding force. Demonstrates excellent effects that can be performed reliably.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a screen winding force adjustment device embodying the present invention, Fig. 2 is a front view showing the entire roll blind, Fig. 3 is a sectional view showing the screen winding force adjustment device, and Fig. 4 5 is a partially cutaway side view showing the screen winding force adjusting device, and FIG. 6 is a sectional view showing another example of this invention. Support shaft 4, winding shaft 5, screen 6, inner cylinder members 11, 23, guide grooves 12, 22, locking recess 13,
Outer cylinder members 14, 21, locking pins 16, 20.

Claims (1)

[Claims for Utility Model Registration] The winding shaft is rotatably supported by a support shaft which is always fixed to the mounting member and rotatably supported by the mounting member only when operated by the operating means that adjusts the screen winding force. In the roll blind, a biasing means is interposed between the support shaft and the winding shaft, and the winding shaft is rotated by the biasing force of the biasing means to wind up the screen. The cylindrical members 14 and 21 are rotatably fitted, and the inner cylindrical members 11 and 23 and the outer cylindrical members 14 and 21 are rotatably fitted together.
one of them is fitted to the support shaft 4 so as to be movable only in the axial direction thereof, and the other is fixed to the mounting member 2, and the inner cylinder members 11, 23 and the outer cylinder members 14, 21
At least a part of the side fitted to the support shaft 4 so as to be movable in the axial direction thereof is exposed to the outside so that it can be operated externally, and the outer circumferential surfaces of the inner cylinder members 11 and 23 and the outer cylinder member 14,
Endless guide grooves 12, 22 are provided in the circumferential direction on one of the inner circumferential surfaces of 21, and locking pins 16, 20 protrude into the guide grooves 12, 22 on the other side.
The guide grooves 12, 22 are provided on the side surfaces of the guide grooves 12, 22.
A locking recess 13 is provided which communicates with the locking pins 16 and 20 and removably engages with the locking pins 16 and 20, and when the locking pins 16 and 20 are engaged with the locking recesses 13, the inner cylinder members 11 and 23 and outer cylinder member 14,
21 is held unrotatable, and the locking pin 16 is held by operating the side of the inner cylinder members 11, 23 and the outer cylinder members 14, 21 that are fitted so as to be movable in the axial direction with respect to the support shaft 4. , 20 and the locking recess 13
A screen winding force adjustment device for a roll blind, characterized in that it can be released from an engaged state.