JPH02197008A - Coupling for lighting apparatus - Google Patents

Abstract

PURPOSE:To change a lamp direction with small operating force by a method wherein when the lamp is rotated to change its direction, frictional resistance between an arm and the lamp is decreased by a pull-apart means. CONSTITUTION:A fiber washer 64 generates large frictional resistance with a washer 63 by force applied by a spring 66. If a lever 93 is pulled by a hand holding a handle 91 while the lever 93 is grasped by the hand, since a wire 96 moves an end of the washer 64 against the spring 66 toward a base plate, the washer 64 is in contact with the washer 63 at only approximately one point thereby making frictional resistance between the washer 64 and the washer 63 extremely small. Therefore, if a lamp 9 is moved in this state, the lamp can be rotated with small operating force.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a joint that allows the direction of a lamp of a lighting device to be changed.

[Conventional technology]

Like the lighting equipment called bedlight shown in Fig. 9, a lighting equipment 9 is housed through an arm 8 (in Surano, the lighting equipment is housed by a joint 1 placed between this arm 8 and the lighting equipment 9). The direction of the light fixture 9 is variable, and the light fixture 9 can be adjusted by the joint 1.
When changing the orientation, it is preferable from the viewpoint of usability that the frictional resistance of the joint 1 allows the lamp 9 to stop in the changed orientation without requiring any tightening operation. With such a joint 1, the lamp 9 can be rotated around both the X and Y axes in the figure, that is, the axis (Y) in the direction connecting the arm 8 and the lamp 9, and the axis (X) in the direction orthogonal thereto. As a device whose direction can be changed, those shown in FIGS. 10 and 11 are provided. This is a combination of the joint part 2 that allows rotation around the X-axis and the joint part 3 that allows rotation around the Y-axis, and these joint parts 2.3 have a common housing 51.52. The joint part 3 includes a shaft part 85 integrally projecting from a hinge part 80 at the tip of the arm 8 formed as a horizontal rank, and a split ring 53 attached to the outer peripheral surface of this shaft part 85. By combining both housings 51 and 52, the split ring 53 is compressed and the shaft portion 85 is tightened. The other joint part 2 has a connecting body 55 provided with a section 56 for attaching the lamp 9 between both housings 51 and 52, and a connecting body 55 that is provided around a fixing screw 65 for assembling both housings 51 and 52. 55 is rotatable, and a group of washers 6, 6 are arranged between the inner surface of both housings 5152 and the connecting body 55. 95 in the figure shows the direction from the inside of the arm 8 to the inside of the joint 1. This is the power cord that is sent to the lamp 9 through the power cord. The frictional resistance required to stop the lamp 9 at that position when the direction of the lamp 9 is changed is generated between the split ring 53 and the shaft 85 in the joint part 3, and is generated between the split ring 53 and the shaft part 85 in the joint part 2 between both housings 51. This is generated by a group of washers 6 disposed between the connector 52 and the connecting body 55.

[Problems to be Solved by the Invention] With the joint 1 having the above structure, it is true that the lamp 9 can be rotated around both the X and Y axes, and the lamp 9 can be directed in the desired direction. There are the following problems regarding rotation around the X axis. That is, when the weight of the lamp 9 is large, the value of the frictional resistance must be increased, otherwise the lamp 9 will rotate around the X-axis and hang down due to its own weight. It is necessary to set the resistance, but when the frictional resistance is increased in this way, the operating force required to change the direction of the lamp 9 also increases, making it impossible to operate smoothly. In addition, when the frictional resistance is increased, the amount of wear that occurs when changing the direction of the lighting equipment also increases, resulting in a decrease in durability. The present invention has been developed in view of these points, and its purpose is to prevent the lighting equipment from sagging, to make it possible to easily change the direction of the lighting equipment, and to improve durability. To provide a joint for lighting equipment which is also rich in functionality.

[Means to solve the problem]

However, the joint for a lighting device according to the present invention is a joint that is arranged between an arm and a lamp, changes the direction of the lamp, and holds the lamp by frictional resistance, and the joint contacts each other by a spring bias. The lamp is characterized in that it includes a pair of frictional resistance generating members, a separating means for separating the pair of frictional resistance generating members against a spring, and an operation part for the separating means disposed on the handle of the lamp. There is. [Function] According to the present invention, even if the hanging of the lamp is prevented by increasing the value of the frictional resistance, when the lamp is rotated to change its direction, the value of the frictional resistance is reduced by the separating means. Since the lamp can be placed in the opposite direction, the direction of the lamp can be changed smoothly. [Example] Hereinafter, the present invention will be described in detail based on the illustrated example.
The lighting equipment shown in the figure is called a bed light installed on the bedside of a hospital, and is composed of an arm 8, a lamp 9, and a joint 1 that connects the lamp 9 to the tip of the arm 8. The base end of the arm 8 is attached to the medical unit 7 and supported on a stand 70 in a state where it can freely rotate around a vertical axis. The arm 8 is formed to have a horizontal rank structure, and is able to freely rotate up and down, and is designed so that the orientation of the lamp 9 connected via the joint 1 does not change even during this rotation. By the built-in spring,
It can be stopped at any rotation position. The lamp 9 is equipped with a fluorescent lamp, and is connected to the arm 8 by the joint 1 disposed between it and the arm 8.
It is possible to freely rotate around both the X and Y axes shown in the figure. The joint 1 here consists of a joint part 2 on the arm 8 side that allows rotation around the Y-axis, and a joint part 3 on the lamp 9 side that allows rotation around the X-axis. It has the same configuration as the conventional example. That is, the case 5 is composed of a pair of housings 51 and 52, a connecting body 55, a group of washers, a split ring 53, etc., and the case 5 is rotatable on a cylindrical shaft 85 protruding from the arm 8. It consists of a cylindrical part that is placed over the housing 51, and a circular cylindrical part located at the tip of this cylindrical part and centered on an axis perpendicular to the axial direction of the cylindrical part. A boss 54 having a square root is provided in a protruding manner. This case 5 has a cylindrical shaft 85 protruding from the arm 8.
It is connected to the arm 8 by covering the outer peripheral surface of the housing with the split ring 53, covering the cylindrical part of the case 5 with the split ring 53, and tightening the cylindrical parts of both housings 51 and 52 with a pair of tightening screws 59 and 59. Ru. At this time, the split ring 53 interposed between the inner peripheral surface of the case 5 and the outer peripheral surface of the cylindrical shaft 85 of the arm 8 is tightened, and the joint portion 3
The case 5 can freely rotate around the axis of the cylindrical shaft 85 with respect to 1Wll[I85 with frictional resistance. On the other hand, the connecting body 55 is composed of a main body having a bottomed double cylindrical shape, and a mounting portion 56 for attaching the lamp 9, which is integrally protruded from the outer peripheral surface of the main body. Installation is part 56
are provided with flanges and screws. The case 5 and the connecting body 55 are connected to the housing 52 of the case 5 with the main body of the connecting body 55 disposed within the cylindrical portion of the case 5 and a group of washers disposed between the inner surface of the main body and the cylindrical portion. It is assembled by screwing the tightening screw 65 inserted into the boss 54 of the housing 51.
It is said that it can rotate freely around the axis of. A group of washers arranged in the axial direction of the tightening screw 65 is arranged between the inner surface of the housing 51 and the connecting body 55;
The inner surface of the housing 52 and the connecting body 55 are further divided into two.
The washer group disposed between the housing 52 has a conical ring 62 that is non-rotatably connected to the tip of the inner cylinder of the connecting body 55, and a protrusion that fits into a plurality of recesses formed on the inner surface of the housing 52. It consists of a washer 60 which is prevented from rotating with respect to the housing 52, and a fiber washer 61 arranged between the washer 60 and the ring 62. Between the housing 51 and the connecting body 55, a washer 63 made of synthetic resin is disposed on one surface of the connecting body 55 in a non-rotating state, a base plate 67 is fixed to the inner surface of the housing 51, and the washer 63. base plate 6
a fiber washer 64 disposed between the base plate 67 and the fiber washer 64; and a fiber washer 64 disposed between the base plate 67 and the fiber washer 64,
A spring 66 is disposed to bias it toward the side. These washer groups are pressed against each other by the tightening of the tightening screw 65 passing through the washer group and the main body of the connecting body 55, and by the force of the spring 66, thereby generating a frictional force between them. Due to this frictional force, the connecting body 5
Even when the lamp 9 is connected to the lamp 5, the connecting body 55 is prevented from rotating relative to the case 5 due to the weight of the lamp 9. On the other hand, as shown in FIG. 1, a U-shaped handle 91 is attached to the lamp 9.
A lever 93 is slidably attached to the. Third
As shown in the figure, a rib 9 slidably engages with a slit 92 formed on the opposing inner surfaces of both sides of the handle 91.
4 at both ends, one end of a wire 96 is connected to the center of the lever 93. The wire 96 is guided inside the lamp 9 as shown in FIG. At the rear, the other end is connected to a part of the periphery of the washer 64. In normal times, as shown in FIG. 4, the fiber washer 64 is in contact with the entire surface of the washer 63 under the force of the spring 66, and the washer 63 is provided with a large frictional resistance that is sufficient to prevent the lamp 9 from sagging due to its own weight. However, if the lever 93 is pulled with the hand holding the handle 91, the wire 96 will push one end of the fiber washer 64 against the spring 66 and pull the lever 93 against the base plate 6. In order to move the fiber washer 64 to the °7 side, the fiber washer 64 comes into contact with the washer 63 at almost only one point, and the frictional resistance generated between the fiber washer 64 and the washer 63 is made very small. Therefore, if the lamp 9 is moved in this state, the lamp 9 can be rotated around the X axis with a light operating force. In addition, the force required to move the fiber washer 64 against the spring 66 can be reduced by connecting the wire 96 to a part of the periphery of the fiber washer 64 so that the fiber washer 64 can be moved using a lever. Even if the spring constant of the spring 66 is large, it can be moved easily, and the amount of wear that occurs at this time also decreases in accordance with the value of frictional resistance. Note that even when the lever 93 is not operated, the direction of the lamp 9 can be changed, although a large operating force is required. Another embodiment is shown in FIGS. 6 to 8. Here, instead of the base plate 67, an electromagnet 4 is fixed to the inner surface of the housing 51, and a fiber washer is used in which a spring 66 is arranged between the electromagnet 4 and the electromagnet 4. 64, the magnetic body 40 is attached. In addition, in the case where the handle 91 of the lamp 9 is equipped with a switch 41 for operating the electromagnet 4, it is normally in a state where it is biased by a spring 66, as shown in FIG. The fiber washer 64 is in contact with the washer 63, creating a large frictional resistance, which prevents the lamp 9 from sagging due to its own weight, and the switch 41 is operated with the hand holding the handle 91 of the lamp 9. When the electromagnet 4 is energized, the electromagnet 4 attracts the fiber washer 64 to which the magnetic body 40 is attached against the spring 66 to separate the fiber washer 64 from the washer 63 as shown in FIG. To,
The frictional resistance between the two becomes zero, and the lamp 9
The only resistance to movement is due to the group of washers provided between the connecting body 55 and the housing 52, and the direction of the lamp 9 can be changed with a light force. Note that if a so-called touch switch, which is activated by simply touching the handle 91, is used as the switch 41, the operability will be further improved. Further, instead of the wire 96, hydraulic pressure may be used.

【Effect of the invention】

As described above, in the present invention, even if a frictional resistance force sufficient to prevent the lamp from hanging due to its own weight is applied to the frictional resistance generating portion, when changing the direction of the lamp, the separating means provided on the handle of the lamp Frictional resistance can be reduced by moving the separating means by operating the operation part and separating the pair of frictional resistance generating members against the spring, so that the direction of the lamp can be changed with a light operating force. Moreover, since the friction resistance generating part at this time has less wear, it can be made highly durable.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is an exploded perspective view of the same, Fig. 3 is an exploded perspective view of the handle and lever, and Figs. 4 and 5 are cross-sectional views showing the operation of the same. , FIG. 6 is a perspective view of another embodiment, FIGS. 7 and 8 are sectional views showing the same operation as above, FIG. 9 is a perspective view of the entire lighting equipment, and FIG. 10 is an exploded perspective view of a conventional example. , FIG. 11 is a cross-sectional view of the same as above, 1 is a joint, 23 is a joint part, 8 is an arm, 9 is a lamp, 63 is a washer, 64 is a fiber washer, 66 is a spring, 91 is a handle, 93 indicates a lever. Agent Patent Attorney Ishi 1) Chief 7Figure 6Figure 7Figure 8Figure 9

Claims (1)

[Claims] (1) A joint that is arranged between the arm and the lamp to change the direction of the lamp and to hold the lamp by frictional resistance, and a pair of frictional resistance generating members that are in contact with each other under a spring bias; 1. A joint for a lighting equipment, comprising a separating means for separating a pair of frictional resistance generating members against a spring, and an operating section for the separating means arranged on a handle of the lamp.