JPH08254085A - Raising/lowering operation device for venetian blind - Google Patents

Abstract

PURPOSE: To eliminate risk of quick fall of a blind even when a grip is handled by a single hand. CONSTITUTION: An raising/lowering operation device for a venetian blind consists of a raising/lowering cord 11 drawn out from a grip via a cord lock receptacle 20 to accommodate a cord lock 21 and a hollow operating rod 15 from a head box, in which a thumb guide 40 is fixed for setting a thumb at a position over the grip of the operating rod, and a snap ring 22 to support a base 28 is installed near the bottom of a lower shaft hole 34 which accommodates the cord lock 21. A grip slope 35 in conical shape is formed in the upper part of the inner surface of the lower shaft hole while a cord lock slope 27 in conical shape is formed on the oversurface of the base, and the outside diameter of the base is made smaller than on max. inside diameter of the grip slope and greater than the min. inside diameter, and a plurality of slide balls 30 are installed between the cord lock slope and the grip slope at a constant spacing circumferentially. When the grip 16 is pulled down, the cord lock 21 is pulled down by slide bal is for a distance corresponding to a certain fraction of the grip pull-down length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a venetian blind raising / lowering operation device. More specifically, the raising / lowering cord of the blind is passed through a hollow operating rod hanging from a head box, and the lower end portion of the hollow operating rod is passed through. The present invention relates to an improvement of a device for pulling out an elevating cord from a grip provided on the vehicle, and braking the elevating cord by a lock mechanism provided in the grip to lower the blind while preventing the blind from dropping by its own weight.

[0002]

2. Description of the Related Art A hollow operating rod capable of driving a rotating shaft for opening and closing a slat is hung from a head box,
An operating device for passing an elevating cord for raising and lowering a blind through the hollow operating rod, pulling it out from a grip attached to its lower end, and braking the elevating cord by a lock mechanism provided in the grip is known from Japanese Patent Publication No. 57-55863. Is.

In this known device, a grip is fitted on the lower end of a hollow operation rod so as to be slidable in the axial direction, a sleeve-like lock receiver is attached to the lower end of the hollow operation rod, and the plug is inserted into and removed from the cord lock receiver. A cord lock was attached to the bottom of the shaft hole of the grip, and a coil spring was interposed between the lower end of the hollow operating rod and the grip to elastically press the grip upward. When the grip is lowered against the coil spring, the cord lock comes out of the cord lock receiver, the lifting cord held between them is released, the blind descends by its own weight, and when the grip is released, the coil spring releases the grip. Push it up to insert the cord lock into the cord lock receiver, sandwich the lifting cord between them to stop the blind at that position. In this state, when the lifting cord is pulled down against the pinch between the cord lock and the cord lock receiver, the blind rises.

[0004]

Since the above device lowers the blind, when the grip is released by one hand to release the lock of the lifting cord, the blind is not dropped by its own hand so that the blind does not drop rapidly by its own weight. It was necessary to perform a two-handed operation of stopping the lifting cord coming out of the grip.
Therefore, there has been a demand for a device that can lower the blind while preventing a sudden drop with only one hand.

The present invention has been made in view of the above, and an object thereof is to provide a device capable of preventing a rapid drop due to the dead weight of a blind during a grip operation.

[0006]

In order to achieve the above object, the means adopted by the present invention is such that a grip is fitted on the lower end of a hollow operating rod so as to be slidable in the axial direction, and a sleeve is attached to the lower end of the hollow operating rod. -Shaped cord lock receiver is connected, and a plug-shaped cord lock that can be inserted into and removed from the cord lock receiver is attached to the bottom of the shaft hole of the grip, and a blind with a grip coil spring interposed between the grip and the hollow operation rod. In the operating device, a thumb guide for holding the thumb and pulling down the grip is fixed to the hollow operating rod, and a cord lock slope is formed on the upper surface of the cord lock base and a grip slope is formed inside the grip shaft hole. The slide ball is interposed between the grip and the grip slope, and the slide ball lowers the descent distance at the beginning of the cord lock. Some that were much smaller than away.

[0007]

In operation, when the thumb is pulled down on the thumb guide and the grip is pulled down, the cord lock must be pulled out from the cord lock receiver by a fraction of the grip pull-down length via the slope and the ball. This allows
As long as the thumb is pulled down on the thumb guide with one hand and the grip is pulled down, the lock on the lifting cord of the cord lock and the cord lock receiver is not released beyond the extent that the lifting cord can slip through, so the lock fully opens and the blind drops suddenly. There is no danger of doing so. If the grip is further lowered after the blind gradually descends close to the lower limit, the grip engages the base of the cord lock and directly lowers the cord lock, so the lock is fully opened and the lifting cord is completely free, and the blind is closed. Falls to the lower limit.

[0008]

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 passes through the inside of the hollow universal joint 14 protruding from the head box 10 and the inside of a hollow operating 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. Hollow operating rod 15
The thumb guide 40 is fixed to the grip 16, and the thumb of the hand holding the grip 16 is applied to the thumb guide 40 to lower the grip 16.

As shown in FIGS. 2A and 3, an annular thumb guide 40 is fixed to the hollow operating rod 15 via a pin 31. A shaft hole 17 penetrating the center of the grip 16 in the axial direction is an upper shaft hole portion 32 having an inner diameter slightly larger than the outer diameter of the hollow operation rod 15 and a middle shaft hole portion 33 for accommodating the grip coil spring 18.
And a lower shaft hole 34 that accommodates the cord lock 21 slidably in the axial direction. A bush 19 having an outer diameter slightly smaller than the inner diameter of the center hole portion 33 is fitted to the lower end of the hollow operation rod 15, and an annular cord lock receiver 20 is fitted to the bush from below.

The upper end of the grip coil spring 18 contacts the inner upper surface of the center hole 33, and the lower end contacts the upper surface of the bush 19. The snap ring 22 is fitted inside the bottom surface of the lower shaft hole portion 34 to prevent the cord lock 21 from falling off. The head 26 of the cord lock 21 is inserted into and removed from the lock hole 29 of the cord lock 20. Two or three lifting cords 11 pass between the head and the lock hole, then pass through the cord hole 24 formed in the base 28 of the cord lock 21, and are pulled out from the bottom of the grip 16.

A protrusion 23 extending vertically is integrally formed in the center hole 33, and a long hole 37 formed in the bush 19 is fitted to the protrusion to rotate the grip 16 integrally with the hollow operating rod 15. A conical grip slope 35 is formed on the inner surface of the lower shaft hole 34, and a conical cord lock slope is formed on the base 28 of the cord lock 21.
Forming 27. The outer diameter of the base 28 is smaller than the maximum inner diameter of the grip slope 35 and larger than the minimum inner diameter.

A cord lock slope 27 is provided around the head 26.
Each slide ball in which three slide balls 30 are arranged at equal circumferential intervals in the space formed by the grip slope 35
Both sides in the circumferential direction around the head 26 of the 30 are in contact with the separators 36 projecting from the grip slope 35. When the grip coil spring 18 pushes up the grip 16, the grip 16 pushes the head 26 of the cord lock 21 into the lock hole 29 of the cord lock receiver 20 via the snap ring 22. as a result,
The lifting cord 11 is locked between the cord lock receiver 20 and the cord lock 21, and the lifting and lowering of the blind is stopped. At this time, in the lower shaft hole portion 34, the three slide balls 30 are in contact with the lower portion of the cord lock slope 27 and the lower portion of the grip slope 35.

In order to lower the blind, the grip is grasped, the thumb is applied to the thumb guide 40, and the grip 16 is pulled down against the coil spring 18 for the grip.
As shown in (b), since the outer diameter of the base 28 of the cord lock 21 is equal to the inner diameter of the central portion of the grip slope 35, the cord lock 21 does not descend at the beginning, but the slide ball 30
Is descending the grip slope 35 by the cord lock slope 27
It goes up and comes into contact with the cord lock receiver 20. As a result, the head 26 of the cord lock 21 is slightly pulled out from the lock hole 29 of the cord lock receiver 20, and thereby the cord lock head is released.
Since the lock of the 26 and the lock hole 29 with respect to the lifting cord 11 is loosened, the lifting cord 11 slips between the cord lock receiver 20 and the cord lock 21 due to the weight of the blind, but the sliding speed of the lifting cord 11 is small due to frictional resistance. , The blind does not fall suddenly but descends gradually. The length by which the slide ball 30 rises and pulls out the head 26 of the cord lock 21 is reduced by the slope and is only a fraction of the pull-down length of the grip 16, so even if the grip 16 is strongly pulled down. There is no risk that the head 26 will come out of the lock hole 29 to the extent that the lifting cord 11 is completely released from the lock. In particular, if the position of the thumb guide 40 is set so that the base 28 of the cord lock 21 engages with the grip slope 35 when the thumb is put on the thumb guide 40 and the grip 16 is fully pulled down, the position of the blind guide 40 can be improved. A sudden drop can be reliably prevented.

Ascending / descending cord as the blind descends
When the load applied to 11 also becomes small and the blind falls near the lower limit, the lifting cord 11 cannot pass through between the cord lock receiver 20 and the cord lock 21. Therefore, as shown in FIG. 2C, when the grip 16 is further lowered and the base 28 of the cord lock 21 is pulled down directly on the grip slope 35, the head 26 is moved to the extent that the lifting cord 11 is free from the lock hole 29. Since it comes off, even if the load applied to the lifting cord 11 is small, the lifting cord 11 moves and the blind lowers to the lower limit. When the grip 16 is released, the grip 16 returns to the locked position shown in FIG. 2A by the repulsive force of the grip coil spring 18. At this time, when the lifting cord 11 protruding from the bottom of the grip 16 is pulled strongly against the lock, the lifting cord 11 moves and the blind rises.

[0015]

As described above, the device of the present invention is different from the conventional one in which the cord lock that directly locks the lifting cord by the grip is pulled down, while the thumb is held on the thumb guide while the grip is pulled down. Since the slide ball on the slope pulls out the cord lock from the cord lock receiver for about a fraction of the pulling down length of the grip and loosens the lock so that the lifting cord can slip through, even if you operate the grip with one hand, It has an excellent effect that the lock is not fully opened and the blind is not suddenly dropped.

[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 before a grip is operated, (b) shows a state in which a thumb is put on a thumb guide and the grip is pulled down. Each of c) shows a state in which the grip is further pulled down and the lock is completely released.

FIG. 3 is a sectional view taken along line III-III in FIG.

[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: Shaft hole, 18: Coil spring for grip, 19: Bush, 20: Cord lock receiver, 21:
Code lock, 22: snap ring, 23: ridge, 24: code hole, 25: knob, 26: head, 27: code lock slope, 28: base, 29: lock hole, 30: slide ball, 31: Pin, 32: Upper shaft hole, 33: Middle shaft hole, 34: Lower shaft hole, 35: Grip slope, 36: Separator, 37: Long hole,
40: Thumb guide,

Claims (1)

[Claims] 1. A hollow operating rod (15) via a hollow universal joint (14) connected to a head box (10), and a grip (1) fitted to the lower end of the hollow operating rod so as to be slidable in the axial direction.
6), a coil spring (18) for gripping between the grip and the hollow operation rod and pushing up the grip, an annular cord lock receiver (20) connected to the lower end of the hollow operation rod, and a shaft of the grip. A cord lock (21) having a head (26) that is inserted into and removed from the lock hole (29) of the cord lock receiver and a base (28) that follows the hole is housed in the hole (17), and one end side is a bottom. A lifting operation device which is fixed to a rail (13) and whose other end side is composed of the hollow operation rod from the head box and an up-and-down cord (11) pulled out from the grip through the cord lock receiver, A thumb guide (40) for placing a thumb on the upper position of the grip is fixed, and a snare for supporting the base near the bottom of a lower shaft hole (34) for accommodating the cord lock of the shaft hole. Pulling (22) is provided,
A conical grip grip slope (35) is formed on the upper part of the inner surface of the lower shaft hole, and a conical code lock slope (27) is formed on the upper surface of the base (28). Is formed to be smaller than the maximum inner diameter of the grip slope and larger than the minimum inner diameter, and a plurality of slide balls (30) are centered around the head in the space between the cord lock slope (27) and the grip slope (35). , The separators (36) along the circumferential direction of the slide ball are integrally provided on the grip slope, and when the grip is pulled down with respect to the thumb guide, the base moves to the grip slope. Until it is engaged with, the cord lock is pulled down by a fraction of the pull-down length of the grip by the slide ball rising up the cord lock slope by the grip slope. Venetian blind lift operating device being characterized in that as.