JP2000207926A - Joint part of arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint part of an arm capable of preventing a luminaire from being lowered due to careless loosening of the joint part of the arm of a desk lamp and the like, and easily changing an angle, when required. SOLUTION: A gear tooth plate 4 having carver teeth 2 and a shaft hole 3 is integrally provided at an end of an arm 1, a side plate 9 provided with a shaft hole 6, an oblong hole 7 and a circular arc-shaped oblong hole 8 is integrally provided at the end of the other arm 5, a hooking bracket 12 provided with a pin hole, a handle 13, a protruding piece 14 and a latch 16 is insertedly mounted in the inside of the gear tooth plate 4, and a pin 11 is fitted into the oblong hole 7 and the pin hole. In this condition, the gear tooth plate 4 and the side plate 9 are linked by a shaft 10, and a spring 15 is hooked across the space between the protruding piece 14 and the shaft 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint of an arm used in a desk lamp or the like, and more particularly to a joint of an arm which can be fixed securely and can easily change the angle of the joint when necessary.

[0002]

2. Description of the Related Art The joint of an arm such as a desk lamp is
The flat surfaces, the spherical surface and the concave spherical surface are tightened by screws so as to be rotatable and fixed.

[0003]

With the above-mentioned conventional joint structure, the fixed state cannot be reliably maintained. Especially, if the joint is used for a long time, the thread is worn and the tightening becomes insufficient.
It is often the case that during use the lamp will drop due to its weight.

In view of the above-mentioned problems of the prior art, the present invention does not prevent the lamp of the arm such as a desk lamp from loosening carelessly and can easily change the angle of the joint when necessary. An object of the present invention is to provide an arm joint.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a tooth having a shaft hole formed by cutting a tooth at the end of one of the arms to be connected, on the outer circumference of a partial circle excluding a portion connected to the arm. A plate is provided integrally, and at the end of the other arm, a shaft hole corresponding to the shaft hole of the tooth plate, a long hole positioned on the radiation centered on the shaft hole or a parallel line thereof, A side plate provided with an arc-shaped long hole located on a concentric circle is integrally provided, a latch is formed at the tip inside the tooth plate, and a pin hole corresponding to the long hole is formed in the middle, and the pin hole is formed. A protrusion is provided between the hook and the latch, and the rear end is bent into an L-shape to form a handle, and the handle passes through the arc-shaped long hole and a pin is fitted into the long hole and the pin hole. Then, a shaft is fitted into the shaft hole on the tooth plate side and the shaft hole on the side plate side so that the latch is hooked on the shaft. Binding and is obtained by become spanned the spring arrangement between the protrusion piece and the shaft.

According to the present invention constructed as described above, when the latch of the latch is hooked on the shaft, the pin inserted into the elongated hole is not fitted on the bottom of the tooth and is not detached, so that the arm is securely fixed. When the handle of the hook is depressed and the handle of the hook is pushed down, the pin is separated from the shaft and the pin inserted into the long hole can swing with the hook, and the angle of the joint can be changed arbitrarily. Can be.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. Two tooth plates 4 each having an arc-shaped tooth 2 formed in the outer periphery at one end of one arm 1 and a shaft hole 3 formed therein.
Are provided integrally, and the end of the other arm 5 is provided with the tooth plate 4
A shaft hole 6 corresponding to the shaft hole 3 of the tooth plate 4, a long hole 7 positioned on the radiation centered on the shaft hole 6, and a concentric circle with the long hole 7 Arc-shaped slot 8
Are connected to each other by a shaft 10. The long hole 7 does not necessarily have to be on the radiation centered on the shaft hole 6 and may be provided on a line parallel to the radiation. Further, the shape of the teeth 2 is arc-shaped, but may be V-shaped.

A pin 11 is fitted into the elongated hole 7 of the side plate 9, and at this time, a hook fitting 12 including a handle 13, a projection 14 and a latch 16 is inserted between the two tooth plates 4. . At this time, the L-shaped handle 13 of the hook fitting 12 passes through the arc-shaped long hole 8 and can be operated outside the side plate 9.

A projection 14 is attached to the hook 12, and a spring 15 is stretched between the projection 14 and the shaft 10.

The dimensional relationship between the long hole 7 of the side plate 9 and the shaft 10 is such that when the pin 11 fitted in the long hole 7 comes closest to the shaft 10, the pin 11 fits into the bottom of the tooth 2. When the pin 11 is located farthest from the shaft 10 in the range of the slot 7, the pin 11 can be moved over the top of the tooth 2.

Next, handling of the arm employing the joint according to the present invention will be described. First, the fixed state of the joint will be described. The side plate 9 and the tooth plate 4 are connected by the shaft 10, and the pin 11 inserted in the long hole 7 and the pin hole 7a is fitted to the bottom of the tooth 2, and the latch 16 is hooked on the shaft 10 by the bias of the spring. It has become. Therefore, the pin 11 fitted in the long hole 7 and the pin hole 7a cannot be moved, and the joint part remains fixed.

To release the fixed state of the joint, the handle 1
When the spring 3 is pushed down against the bias of the spring 15, the latch 16 is separated from the shaft 10, and the pin 11 fitted in the slot 7 and the pin hole 7a can be retracted along with the hook 12 along the slot 7, and the slot 7 The pin 11 fitted in the pin hole 7a can get over the teeth 2 and the angle of the joint can be changed.

FIG. 3 shows a state in which a desk lamp 17 employing a joint according to the present invention is attached to a desk 18. Desk 1
A base 20 is attached to the base 8 by a vise 19, and the first arm 1 a, the second arm 1 b, and the third arm 1 c are connected to the base 20 by the joints described above, and
7.

When the joint is moved, the handle 13 is pushed downward against the bias of the spring 15 so that the latch 1
When the handle 6 is disengaged from the shaft 10 and the angle of the joint of the arms 1a, 1b, 1c can be changed, the handle 11 is released at a desired position, and the pin 11 fits on the bottom of the tooth 2 and the latch 16
Hangs on the shaft 10 and the joint is fixed in that state.

[0015]

As described above, according to the present invention, when the joint of the arm is fixed, the arm is not accidentally loosened, and when the angle of the joint is desired to be changed, the handle can be easily operated by operating the handle. Can be changed to Therefore, it is possible to prevent the device from being inadvertently lowered by the weight of the device attached to the tip of the arm during the operation.

[Brief description of the drawings]

1A is a front view of an embodiment according to the present invention, FIG. 1B is a plan view thereof, and FIG.

FIG. 2 is an exploded perspective view of the embodiment according to the present invention.

FIG. 3 is a front view of a usage example of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arm (tooth plate side) 2 Teeth 3 Shaft hole (of tooth plate) 4 Tooth plate 5 Arm (of side plate) 6 Shaft hole (of side plate) 7 Elongated hole 7a Pin hole (of hook metal) 8 Arc length Hole 9 Side plate 10 Axis 11 Pin 12 Hook fitting 13 Handle 14 Projection piece 15 Spring 16 Hatch 17 Desk lamp 18 Desk 19 Vise 20 Base

Claims (1)

[Claims] 1. A tooth plate 4 having a shaft hole 3 formed by cutting teeth 2 around a partial circle excluding a part connected to the arm 1 is integrally provided at an end of one arm 1 to be connected, and the other arm 5 is provided. A shaft hole 6 corresponding to the shaft hole 3 of the tooth plate 4, a long hole 7 positioned on the radiation centered on the shaft hole 6 or on a parallel line thereof, and a concentric circle of the long hole 7 A side plate 9 provided with a circular arc-shaped long hole 8 is integrally provided, a latch 16 is formed at the tip inside the tooth plate 4, and a pin hole 7a corresponding to the long hole 7 is formed in the middle. The pin hole 7a and the latch 16
A hook 14 having a handle 13 formed by bending a rear end into an L-shape, and the handle 13 penetrating through the arc-shaped long hole 8 and a pin hole 7a, the pin 11 is fitted into the shaft hole 3, and the shaft 10 is fitted and connected to the shaft hole 3 and the shaft hole 6 such that the latch 16 is hooked on the shaft 10.
The joint of the arm that spans five.