JPH08158763A - Venetian blind lifting device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a lifting operation device capable of preventing a weight drop in a Venetian blind operated by a lifting code. [Structure] A cord lock receiver 20 is attached to the lower end of the hollow operating rod 15, a coil spring 18 for grip that constantly pushes up the grip is arranged between the hollow operating rod and the grip 16 fitted outside, and a cord lock of a through hole 17 of the grip A code lock 21 is provided slidably in the axial direction in the hole 17d, and a code lock coil spring 23 for pushing the code lock into the code lock receiver is arranged between the grip and the code lock, and released to the lower portion 31 of the grip. A slit that fits the ring 30 slidably in the axial direction and extends in the axial direction at the bottom of the grip
When the cord lock and the release link are integrally connected to each other through the pin 33 which is formed in the slit and slidably passed through the slit, and the release ring is pulled down, the cord lock is removed from the cord lock receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a venetian blind lifting / lowering device capable of preventing a blind from dropping due to its own weight.

[0002]

2. Description of the Related Art An elevating cord is passed through a hollow operating rod that hangs from a blind headbox, and is pulled out from a grip provided at the lower end of the hollow operating rod to the elevating cord, and the elevating cord is braked by a lock mechanism provided in the grip. A device for preventing the blind from dropping due to its own weight is disclosed in JP-A-6-317077. The device is a hollow operating rod, a grip that is fitted onto the hollow operating rod so as to be slidable in the axial direction, a coil spring for a grip that pushes up the grip, and an annular cord lock receiver provided at the lower end of the hollow operating rod. A code lock disposed so as to be slidable in the code lock hole of the grip in the axial direction and capable of being inserted into and removed from the code lock receiver, and a cord lock spring that pushes up the code lock in the code lock hole in the axial direction, It was a method of locking the lifting cord by gripping it between the cord lock receiver and the cord lock. Even if the grip is pulled down to lower the blind, the force of the coil spring that grips the lifting cord will be relaxed if the amount of pulling down is within the slidable range of the cord lock, but the cord lock will not come out of the cord lock receiver. Therefore, the blind gradually descended due to its own weight, and there was no fear of a sudden drop.

[0003]

When the blind is lowered and the grip is pulled down too much to pull out the cord lock from the cord lock receiver, the lifting cord is released all at once and the blind falls suddenly. There was a problem of giving down. The present invention has been made to solve this problem, and an object of the present invention is to raise and lower a Venetian blind so that the blind does not suddenly drop even if the grip is pulled down too much in order to lower the blind. To provide an operating device.

[0004]

In order to achieve the above object, the means adopted by the present invention is such that a release ring is axially slidably fitted on a lower portion of a grip, and one or more shafts are provided on a lower portion of the grip. A slot or slit that extends in the direction is opened, a pin is slidably inserted into the slot or slit, the release ring and the cord lock are integrally connected via the pin, and the cord is locked when the release ring is lowered. Although it comes out of the cord lock receiver, the cord lock coil spring is loosened even when the grip is pulled down, but the cord lock is configured so that it never comes out of the cord lock receiver.

[0005]

[Function] When the grip is pulled down to lower the blind, the cord lock remains in the cord lock receiver, but the cord lock coil spring that pushes up the cord lock loosens. The force to lock the sandwiched lifting cord weakens. As a result, the lifting cord to which the weight of the blind is applied slips between the cord lock and the cord lock receiver, and the blind descends, but due to frictional resistance, the blind descends gradually without suddenly dropping.

As the blind descends, the load of the blind on the elevating cord becomes smaller. Therefore, when the blind descends close to the lower limit, the elevating cord cannot come out between the cord lock and the cord lock receiver. At this time, when the release ring is lowered, the cord lock is removed from the cord lock receiver, and the elevating cord is completely released. Therefore, even if the load of the blind applied to the elevating cord is small, the blind surely descends to the lower limit.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention will be described based on the embodiments shown in the drawings. As shown in FIG. 1, one end of an elevating cord 11 hanging from a head box 10 of a Venetian blind penetrates a slat 12 to reach a bottom rail 13 and is fixed there. The other end of the lifting cord 11 passes through the inside of the hollow universal joint 14 protruding from the head box 10 and into the inside of the hollow operation rod 15 connected to the hollow universal joint. Hollow operating rod
A grip 16 is fitted on the lower end of the shaft 15 so as to be slidable in the axial direction, and the other end of the elevating cord 11 is pulled out from the grip 16 to a knob 25 and fixed there. A release ring 30 is fitted onto the outer peripheral surface of the lower portion 31 of the grip 16, and the release ring 30 can be slid along the slit 32 in the axial direction.

As shown in FIGS. 2A and 3, a through hole 17 that axially penetrates the center of the grip 16 has an operating rod hole portion 17 having an inner diameter slightly larger than the outer diameter of the hollow operating rod 15 from above.
a, a coil spring hole 17b for accommodating the grip coil spring 18, a bush hole for accommodating the bush 19
17c, a cord lock hole portion 17d for accommodating the cord lock 21 slidably in the axial direction. At the lower end of the hollow operation rod 15, a bush having an outer diameter slightly smaller than the inner diameter of the bush hole 17c.
19 is fitted, and a hollow shaft-shaped cord lock receiver 20 is fitted into the bush from below. Coil spring for grip 18
Has an upper end contacting an inner upper surface 29 of the coil spring hole portion 17b, and a lower end contacting an inner seat 26 of the bush 19. Cord lock hole
A snap ring 22 is fitted inside the bottom surface of 17d to prevent the cord lock 21 from falling off.

The head of the cord lock 21 has a plug shape,
It can be inserted into the shaft hole of the cord lock receiver 20. Two or three lifting cords 11 pass between the cord lock receiver 20 and the head of the cord lock 21, and the cord hole 24 of the cord lock 21.
Go out through. A cord lock coil spring (23) is arranged between the bottom surface of the annular seat of the cord lock (21) and the snap ring (22) fitted to the inner and lower ends of the grip (16).

The lower portion 31 of the grip 16 has a smaller diameter than the upper portion, and the release ring 30 is fitted onto the lower portion 31. The outer diameter of the release ring 30 is the same as the upper portion of the grip 16 above the lower portion 31. The lower part 31 of the grip 16 is provided with three slits 32 extending in the axial direction at equal intervals in the circumferential direction. For ease of assembly, the release ring 30 and the three pins 33 are a synthetic resin integrally molded product. The pin 33 integrated with the release ring 30 is elastically fitted into the pin hole 34 of the cord lock 21. Then, align the pin 33 with the slit 32 and lower the 31 of the grip 16.
Is inserted into the annular gap between the release ring 30 and the cord lock 21. Next, the snap ring 22 is fitted on the inner circumference of the lower end of the lower portion 31, and the coil spring 27 for the cord lock is attached between the snap ring 22 and the cord lock 21. The operation ring 30 can slide the lower portion 27 of the grip 16 together with the cord lock 21 in the axial direction.

While the blind is stopped, the grip coil spring 18 compresses the cord lock coil spring 23 and abuts the lower peripheral end surface of the cord lock 21 surrounding the cord lock 23. Therefore, the cord lock 21 is cord-locked by the repulsive force of the spring. Pushed into the shaft hole of the receiver 20 and received the code lock receiver
Lifting cord 11 sandwiched between 20 and the head of cord lock 21
Is completely locked. At this time, the release ring 30 is located at the lower limit of the lower portion 31 of the grip 16.

To lower the blind, FIG. 2 (b)
When the grip 16 is pulled down, the grip coil spring 18 is compressed, and when the inner upper surface 27 of the bush hole 17c abuts on the upper end of the bush 19, as shown in FIG. Abut the lock 21. At this time, the cord lock 21 remains pushed into the shaft hole of the cord lock receiver 20, but the cord lock spring 23
Since the slack is weakened, the force to pinch the lifting cord 11 is weakened, and the lifting cord 11 receives the cord lock due to the weight of the blind.
Slip between 20 and code lock 21. However, the speed of the ascending / descending cord 11 is small due to the frictional resistance, and the blind does not suddenly drop but gradually descends. At this time, the release ring 30 is at the upper limit position on the grip 16.

Ascending / descending cord as the blind descends
The load on 11 becomes lighter. When the blind descends near the lower limit, the load on the lifting cord becomes smaller,
You will not be able to slip between the cord lock receiver and the cord lock. Therefore, as shown in FIG. 2C, when the release ring 30 is pushed down along the slit 32, the pin 33
The cord lock 21 also goes down through the cord lock 21
Is released from the shaft hole of the cord lock receiver 20, the lock of the lifting cord 11 is completely released, and the blind surely descends to the lower limit.

[0014]

As described above, the device of the present invention is different from the conventional method of completely releasing the lock of the lifting cord by pulling down the grip, and is a method of completely releasing the lifting cord by the release ring fitted on the grip. Therefore, no matter how the grip is pulled down, there is no possibility that the blind will suddenly drop.

[Brief description of drawings]

FIG. 1 is a side view showing an essential part of a Venetian blind equipped with an apparatus according to an embodiment of the present invention,

2 is a cross-sectional view of a main part of the apparatus of FIG. 1, (a) shows a state when a blind is stopped, (b) shows a state where a grip is pulled down, and (c) shows a state where a release ring is pulled down. Each state is shown.

3 is a sectional view taken along line II-II of FIG. 2,

[Explanation of symbols]

10: head box, 11: lifting cord, 12: slats,
13: Bottom rail, 14: Hollow universal joint, 15: Hollow operating rod, 16: Grip, 17: Through hole, 18: Coil spring for grip, 19: Bush, 20: Cord lock receiver, 2
1: cord lock, 22: snap ring, 23: coil spring for cord lock, 24: cord hole, 25: knob,
26: Seat, 27, 28, 29: Upper inner surface, 30: Release ring, 31:
Lower part, 32: Slit, 33: Pin, 34: Pin hole

Claims (2)

[Claims] 1. A hollow operating rod (15) connected to a head box (10), a grip (16) externally fitted to a lower end portion of the hollow operating rod so as to be slidable in an axial direction, the grip and the hollow operating rod. A grip coil spring (18) between the rods for pushing up the grip, and an annular cord lock receiver (20) connected to the lower end of the hollow operation rod,
The cord lock hole portion (17) of the through hole (17) of the grip.
a cord lock (21) disposed in the d) so as to be slidable in the axial direction and detachable from the cord lock receiver;
An elevating cord (11), one end of which is fixed to the bottom rail (13) and the other end of which is pulled out from the head box through the hollow operation rod and the cord lock receiver to the outside through the cord hole (24) of the cord lock. In a lifting and lowering operation device comprising a cord lock coil spring (23) for pushing the cord lock into the cord lock receiver between the grip and the cord lock, a release ring is provided at a lower portion (31) of the grip. (30) is slidably fitted in the axial direction, and at least one axially extending slit (32) or slot is provided in the lower part of the grip so that the grip can slide in the slit or slot. When the cord lock and the release ring are integrally connected through the pin (33) passed through and the release ring is lowered with respect to the grip, the cord lock The device for lifting and lowering a venetian blind, characterized in that it can be removed from the cord lock receiver. 2. A pin (33) is integrally provided on a release ring (30), and the release ring and a cord lock (21) are assembled together to form the pin with a slit (32) in a lower part (31) of a grip (16). ), And a snap ring (22) is fitted on the inner peripheral surface of the lower end of the lower part to prevent the cord lock from coming off the grip, and between the slit and the cord lock, a coil spring for cord lock (23). ) Is arranged, The raising / lowering operation device of the Venetian blind according to claim 1.