JPH0510146Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a dead weight drop prevention device for preventing the dead weight of the slats and bottom rail of a blind from falling.

(Prior art) Conventionally, as a type of blind, a lifting cord is hung from one side of a headbox, and by pulling out the lifting cord, a slat is pulled up, and the lifting cord is moved inside the headbox using the weight of the slats and bottom rail. There is one in which the slats are lowered by retracting them. In such blinds, a head box is provided with a dead weight drop prevention device to prevent the dead weight of the slats and bottom rail from falling when the lifting cord is not operated. This self-weight drop prevention device inserts a lifting cord between a fixed roller and a movable roller, and when the lifting cord is not operated, the lifting cord is clamped between both rollers to prevent its movement, and when in operation, the movable roller is This allows the lift cord to be pulled out and retracted by moving it downward under its own weight.

(Problem that the invention aims to solve) In recent years, with the diversification of blinds, there are some in which the lifting cord hangs from the side of the head box.In such blinds, the lifting cord moves horizontally within the self-weight drop prevention device. In order to
The movable roller is also movable horizontally along its moving direction. However, with this structure, the movable roller cannot be moved using its own weight, so it is not possible to reliably move the movable roller to the inactive position when the lifting cord is pulled out or retracted. There was a problem in that the movable roller sometimes moved unexpectedly and the lifting cord was caught between it and the fixed roller, making it impossible to perform smooth operation. The purpose of this invention is to provide a self-weight drop prevention device that is simple in structure and can operate reliably even when the lift cord and movable roller are moved horizontally.

Structure of the invention (Means for solving the problem) In order to solve the above problem, this invention has a fixed roller that is rotatably supported on a vertical rotation axis, and rotates on a vertical rotation axis. The movable rollers supported by the slats can be moved toward and away from each other, and a lifting cord for raising and lowering the slats is inserted between the fixed roller and the movable roller, and when the lifting cord is not operated, the lifting cord is connected between the fixed roller and the movable roller. A gear 1 is attached to the end of the movable roller 7 in a dead weight drop prevention device that prevents the dead weight of the slat from falling by being sandwiched between
0 is provided, and the movable roller 7 is engaged with the gear 10.
A stopper 11 provided with a locking piece 14 that prevents only the rotation of the slat in the downward direction is supported so as to be able to approach and separate from the movable roller 7, and the lifting cord 3 is inserted into the insertion hole 13 of the stopper 11 to close the lifting cord. The locking piece 14, which is located at a position where it engages with the gear 10 when the gear 10 is not operated, can be moved to a position away from the gear 10 when the slat is raised or lowered.

(Function) With the above means, by operating the lifting cord 3, the locking piece 14 of the stopper 11 is moved to the movable roller 7.
When the lifting cord 3 is moved away from the gear 10, the lifting cord 3 can be freely pulled out and retracted.
When the stopper 11 is released, the stopper 11 returns to its original position and the locking piece 14 engages with the gear 10, so that the movable roller 7
rotation is prevented.

(Embodiment) Hereinafter, an embodiment embodying this invention will be described with reference to the drawings. As shown in FIG. 2 is opened at the front of the head box 1, and a plurality of lifting cords 3 are suspended from the opening. When the lifting cord 3 is pulled out from the head box 1, the slats 4 are pulled up, and when pulled into the head box 1, the slats 4 are lowered, and when not operated, the dead weight drop prevention device 2 automatically lowers the dead weight of the slats 4. It is becoming increasingly difficult to do so.

The self-weight drop prevention device 2 will be explained with reference to FIGS. 1 to 3. A fixed roller 6 is rotatably supported in a case 5 of the device 2 with its rotation axis in the vertical direction. The outer circumferential surface has irregularities to prevent slipping.

A movable roller 7 is arranged diagonally in front of the fixed roller 6. The movable roller 7 is supported by support shafts 8 protruding from both upper and lower ends in elongated holes 9 provided in the top and bottom surfaces of the case 5. That is, the movable roller 7 has its support shaft 8 supported by the elongated hole 9, so that the movable roller 7 is rotatably supported with its axis of rotation in the vertical direction, similar to the fixed roller 6, and is supported by the elongated hole 9. It is supported so as to be movable towards and away from the fixed roller 6 along the line. The movable roller 7 has irregularities similar to those of the fixed roller 6 on its circumferential surface, and gears 10 that engage only in one direction are integrally formed at both ends.

A stopper 11 is supported in front of the movable roller 7 so as to be movable in the left-right direction along guide grooves 12 provided on the top and bottom surfaces of the case 5. An insertion hole 13 is formed in the center of the stopper 11 through which the lifting cord 3 is inserted to move the stopper, and a locking piece 14 is formed on one side of the stopper 11 to protrude toward the side of the movable roller 7. has been done. As shown in FIG. 3, the gear 10 of the movable roller 7 engages with the locking piece 14 only when rotated in the direction of arrow A with the locking piece 14 positioned near the gear 10. It's getting old.

The lifting cord 3 guided in the direction of the case 5 inside the head box 1 is inserted between the fixed roller 6 and the movable roller 7 in the case 5, passes through the insertion hole 13 formed in the stopper 11, and is installed on the front surface of the case 5. It is suspended downward from the head box 1 from the outlet 15. In addition, the lifting cord 3 is connected to the movable roller 7.
When the stopper 11 is pulled in the direction away from the slat 4, the stopper 11 is moved in the same direction and its locking piece 14 engages with the gear 10 of the movable roller 7, thereby preventing the rotation of the movable roller 7 and causing the weight of the slat 4 to fall. is prevented.

Now, in the self-weight drop prevention device 2 configured in this way, the lifting cord 3 is connected as shown by the solid line in FIG.
When the stopper 11 is pulled toward the movable roller 7, the stopper 11 is moved in the same direction, and its locking piece 14 is moved away from the gear 10 of the movable roller 7. In this state, the movable roller 7 can freely rotate, so the lifting cord By pulling out or retracting the slats 3, the slats 4 can be freely raised and lowered.

On the other hand, if you let go of the lifting cord 3 after raising and lowering the slat 4 to the desired position, the lifting cord 3 will attempt to be pulled into the head box 1 at the position shown by the chain line in FIG. At the same time, the movable roller 7 moves along the elongated hole 9 in the direction of the fixed roller 6, and the lifting cord 3 is moved to the position shown in FIG.
is sandwiched between the fixed roller 6 and the gear 10 is engaged with the locking piece 14 at almost the same time as the movable roller 7.
rotation is prevented. As a result, the lifting cord 3 is prevented from moving in the same direction, and the slat 4 is prevented from lowering under its own weight. Furthermore, even in this state, the movable roller 7 can rotate in the direction in which the lifting cord 3 is pulled out, that is, in the direction of arrow B in FIG. 3, while pushing away the locking piece 14 with the gear 10. I can do it.

As described above, this self-weight drop prevention device 2 has a structure that moves the movable roller 7 in the horizontal direction, but it can be moved by moving the locking piece 14 of the stopper 11 away from the gear 10 of the movable roller 7 when the slat 4 is raised or lowered. By making the roller 7 freely rotatable, the slat 4 can be moved up and down smoothly. When the lifting cord 3 is released, the lifting cord 3 is automatically sandwiched between the fixed roller 6 and the movable roller 8, and the rotation of the movable roller 7 is prevented, thereby preventing the slat 4 from falling under its own weight. be able to.

Effects of the invention As detailed above, this invention has the movable roller 7
In a self-weight drop prevention device that moves a slat horizontally relative to a fixed roller, the slat exhibits an excellent effect of smoothly raising and lowering the slat.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view of a self-weight drop prevention device that embodies this idea, Figures 2 and 3 are cross-sectional views showing its operating state, and Figure 4 is a dead weight drop prevention device attached to a head box. FIG. 3 is a front view of the device. Lifting cord 3, fixed roller 6, movable roller 7,
Gear 10, stopper 11, insertion hole 13, locking piece 1
4.

Claims (1)

[Scope of utility model registration request] A movable roller, which is also rotatably supported by a vertical rotation axis, can be moved toward and away from a fixed roller that is rotatably supported by a vertical rotation axis, and the lifting cord for raising and lowering the slats is connected to the fixed roller. The end of the movable roller 7 is inserted between the end of the movable roller 7 and is inserted between the movable roller and the lifting cord is sandwiched between the fixed roller and the movable roller when the lifting cord is not operated to prevent the dead weight of the slat from falling. A stopper 11 is provided on the movable roller 7, and a stopper 11 is provided with a locking piece 14 that engages with the gear 10 and prevents only the rotation of the movable roller 7 in the downward direction of the slat.
When the elevating cord 3 is inserted into the insertion hole 13 of the stopper 11 and the elevating cord 3 is not operated, the locking piece 14 is engaged with the gear 10 when the elevating cord 3 is not operated. 1. A device for preventing the dead weight of a blind from falling, characterized in that it is operable to move to a position away from 10.