JPH0345385Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an arm-type stand lighting fixture, such as a hospital bed light, desk stand, study stand, etc., which has an arm that allows the position of the lighting fixture to be freely moved. be.

[Background Art] Arm-type stands such as bed lights for hospitals have the following features in order to keep the lighting equipment stationary at an arbitrary position. That is, a spring that supports (balances) the weight of the lighting device is built into the arm so that the lighting device can remain stationary no matter which position within the movable range the arm moves. Also, it has a parallel crank mechanism that ensures that the lighting fixture moves forward when the arm is moved within its movable range. This parallel crank mechanism
In an arm with a parallel crank, one parallel crank side is formed with a square pipe, the other side parallel crank is housed inside this square pipe, a balancing spring is provided on the housed parallel crank side, and this spring is similarly attached. All of the spring-loaded metal fittings used to operate the device are also built-in. With this configuration, although it has a parallel crank mechanism, it is an arm-type stand that looks like one arm.

Fig. 4 shows the basic configuration of this arm-type stand, in which the arms 3 include two upper arms 3a, a lower arm 3b, three upper hinge parts 4a, a middle hinge part 4b,
It is composed of a lower hinge portion 4c. Each hinge portion 4a to 4c is rotatable, and the upper hinge portion 4a
The position of the lighting equipment attached to the side can be moved arbitrarily. Further, an electric wire 6 for lighting the lighting equipment is built into the arm 3. FIG. 5 shows the case where the lighting fixture 5 is moved, and by bending and moving the arms 3a and 3b via each hinge part 4a to 4c, the position of the lighting fixture 5 is set to a location that is easy for the user to use. It is used as follows.

FIG. 6 shows an exploded perspective view of the middle hinge part 4b,
In the upper arm 3a, a pipe 10 constituting one parallel crank is formed into a square shape, and a shaft 11 constituting the other parallel crank is housed within the pipe 10. The shaft 11 has a spring 1 for balancing the lighting equipment.
2 is wound around the spring press fitting 1 for causing the above-mentioned balance spring 12 to act on the end of the shaft 11.
3 is provided. In addition, the shaft 11 has a metal fitting 1.
4 is provided. A substantially disk-shaped mounting plate 15 made of metal
rotates around a pin 16 that is the center of the middle hinge portion 4b, and a pin 17 that is the center of rotation on one side of the shaft 11 (metal fitting 14) and a spring-loaded metal fitting are mounted on one surface of this mounting plate 15. A pin 18, which is the center of rotation of 13, is fixed. The mounting plate 15 is covered with covers 9a and 9b on both sides.
9b is fixed by a pin 16 and a thumb screw 20 via a sliding washer 19. The tip of the thumb screw 20 is adapted to be screwed into a screw hole 16a (see FIG. 9) formed in the pin 16. Also, the pin 16 is connected to the hole 15a of the mounting plate 15.
is inserted, and the mounting plate 15 is designed to rotate around this pin 16.

The pipe 10 is connected to the rectangular connection part 21 of the cover 9b by a rivet 22, and the other cover 9a
The pipe 23 of the lower arm 3b is connected to the connecting portion 25 via a rivet 24. A pin 28 , which is the center of rotation of the metal fitting 27 of the shaft 26 disposed within the pipe 23 , is fixed to the other surface of the mounting plate 15 .

Since each of the above members is made of metal, bushings are used to ensure smooth rotation. That is, as shown in FIGS. 7 to 9, a cylindrical bushing 29 is installed in the hole 15a of the mounting plate 15, and the pin 16 is inserted into this bushing 29. Also, each pin 17, 18, 2
8 has bushings 30, 31, which have a collar at the base.
32 is installed. Note that FIG. 8 shows the pin 28, and the base 28a is square to prevent rotation. Each pin 17, 18, 28 has a ninth position on the mounting plate 15.
As shown in the figure, it is fixed by a method such as welding (X in the figure). In FIG. 9, a bushing 31 is attached to the pin 18 fixed to the mounting plate 15, and the hole 13a of the spring press fitting 13 is inserted into the outer periphery of the bushing 31. Further, the bushing 32 is attached to the pin 28, and the hole 27a of the metal fitting 27 is inserted into the bushing 32. Furthermore, the bushing 20 is inserted into the hole 1 of the mounting plate 15.
5a, and insert the pin 16 into this bushing 29.
insert and screw together with the knob screw 20 as described above.

Each bushing 29, 30, 31, 32 is made of synthetic resin with excellent sliding properties and wear resistance, such as polyacetal or nylon, so that friction does not occur because the rotating shaft of each metal fitting is made of metal. It is something that However, in this case, the following problems occurred. That is, since the bushings are individually fitted into pins or the like, assembly is time-consuming and requires a large number of parts, resulting in relatively high costs. Further, since the mounting plate 15 itself is made of metal, the internal electric wire 6 passes through the middle hinge portion 4b after assembly, so that the electric wire 6 is damaged when the arm 3 is bent. Furthermore, the first
As shown in Figure 0, since each metal fitting 13 and the mounting plate 15 are made of metal, there is friction between the metals (Y in the figure).
This may result in the generation of metal powder or abnormal noises such as squealing. However, due to the structure of the arm 3, a large repulsive force of the spring 12 is applied, so metal pins 17, 18, 28 and the mounting plate 15 must be used at present.

[Purpose of the invention] The present invention has been proposed in view of the above points, and aims to prevent the generation of metal powder, abnormal noise, and rattling due to wear by eliminating contact parts between metals. The purpose of this invention is to provide an arm-type stand lighting fixture for the purpose.

[Disclosure of the invention] (Structure) The present invention has a lighting fixture attached to the tip of an arm via a hinge part that stands upright from the base and is freely rotatable in the middle. The shaft on one side of the parallel crank has a balance spring that balances the weight of the lighting equipment in order to keep it stationary in position, and a metal mounting plate is built into the hinge part to connect the spring press fitting that acts on the balance spring. In this arm-type stand, the outer circumferential surface of the above-mentioned mounting plate is covered with a synthetic resin with high sliding properties by outsert molding. Even if the spring pusher or spring press fittings come into contact, there is no contact between the metal parts of each member, which prevents the generation of metal powder due to wear, the generation of abnormal noise, and the generation of rattling. It is something.

(Example 1) Hereinafter, an example of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of the present invention. As mentioned above, the mounting plate 15 is designed to directly receive the spring force of the balance spring 12 through the shaft 11 and the spring press fitting 13.
5 and the pins 17, 18, and 28 that serve as the rotation axis must be made of metal to ensure the necessary bending durability. Therefore, in the present invention, the mounting plate 15 and the pin 1
7, 18, 28, etc. are made of metal, and both are firmly joined by welding or the like. The outer peripheral surface thereof is outsert molded with a synthetic resin 8 having high slidability and wear resistance, such as polyacetal or nylon. In the embodiment of FIGS. 1 and 2, pin 1
Only the surroundings of 7, 18, and 28 are not molded with resin.
This is because bushings 30, 31, 32 similar to the conventional ones are used for the pins 17, 18, 28. Incidentally, a bushing 8a is simultaneously formed by outsert molding at a location corresponding to the conventional cylindrical bushing 29, which is the center of rotation of the middle hinge portion 4b. The reason why the bushings 30, 31, and 32 are used is that the movement is smoother if the bushings 30, 31, and 32 can freely move between the shaft 11, the spring press fitting 13, and the pins 17, 18, and 28, which are the rotation axes. , the one that wears out is not fixed, that is,
This is because the bushings 30, 31, and 32 rotate, improving durability. By the way, the middle hinge part 4
b is pressed from both sides by protrusions 33 (FIG. 6) provided on the inner surfaces of both covers 9a and 9b to set the positional relationship between both covers 9a and 9b. The thickness dimension t of the mounting plate 15 including the thickness is a very important dimension. In other words, although sheet metal parts are prone to warping during press working, since outsert molding is performed from above, it is easy to ensure dimensional accuracy.

(Embodiment 2) Fig. 3 shows another embodiment, in which bushings 8b, 8c around pins 17, 18, 28, which serve as rotation axes.
At the same time, outsert molding is performed using the same synthetic resin 8 as above. In this embodiment, since the entire surface of the mounting plate 15 is covered with synthetic resin 8 by outsert molding, there is no need to perform surface treatment such as plating on the internal metal parts, which can reduce costs. be. In addition, in the previous embodiment, the pin 1 which is the center of rotation of the mounting plate 15
Since the bushings 8a for No. 6 and all the bushings 8b in this embodiment can be molded at the same time, it is possible to improve assembly work efficiency and reduce costs by reducing the number of parts.

[Effects of the invention] As described above, the present invention attaches a lighting fixture to the tip of the arm via a hinge part that stands up from the base and is freely rotatable in the middle, so that the lighting fixture can be moved freely within the movable range. A metal mounting plate is attached to the hinge part to connect the shaft on one side of the parallel crank, which has a balance spring that balances the weight of the lighting equipment in order to keep it stationary at this position, and a spring press fitting that acts on the balance spring. In the built-in arm type stand, the outer peripheral surface of the above mounting plate is covered with a synthetic resin with high sliding properties by outsert molding, so the outer peripheral surface of the metal mounting plate is covered by outsert molding. Even if the shaft or spring-loaded fittings come into contact with the synthetic resin, there are no parts where the metals of each member come into contact with each other, which prevents the generation of metal powder due to wear, the generation of abnormal noise, and the occurrence of rattling. In addition, since the outer peripheral end surface of the metal mounting plate is covered with synthetic resin, there are no metal edges and there is no risk of damaging the built-in electric wires.
Furthermore, since the mounting plate is covered with synthetic resin, even if the wire coating is torn inside the arm due to bending of the arm, there is no risk of electric shock, etc., resulting in a double insulation structure. .

[Brief explanation of drawings]

Fig. 1 is a sectional view of a mounting plate according to an embodiment of the present invention, Fig. 2 is a perspective view of the same as above, Fig. 3 is a sectional view of another embodiment of the same as above, and Fig. 4 is a sectional view of an arm of a conventional example. , FIG. 5 is an explanatory diagram of the same operation as above, FIG. 6 is an exploded perspective view of the middle hinge part of the same as above, FIG. 7 is an exploded perspective view of the main part of the middle hinge part of the same as above, and FIG. A perspective view, FIG. 9 is an exploded sectional view of a main part of the same, and FIGS. 10a and 10b are a perspective view and a sectional view of a main part of the same. 3 is an arm, 4b is a middle hinge, 5 is a lighting fixture, 8 is a synthetic resin, 11 is a shaft, 13 is a spring press fitting, and 15 is a mounting plate.

Claims (1)

[Scope of utility model registration request] A lighting fixture is attached to the tip of the arm via a hinge part that stands up from the base and can rotate freely in the middle.
A shaft on one side of a parallel crank having a balance spring that balances the weight of the luminaire to keep the luminaire stationary at any position within its movable range;
In an arm-type stand that has a metal mounting plate built into the hinge part that connects the spring-loading fittings etc. that act on the balance spring, the outer peripheral surface of the mounting plate is made of synthetic resin with high sliding properties by outsert molding. An arm-type stand lighting fixture characterized by being covered.