JPH0638324Y2 - Lighting stand - Google Patents

Description

[Detailed description of the device]

[Industrial applications]

The present invention relates to a lighting stand mounted on a table for use.

[Prior art]

Conventionally, as a lighting stand of this kind, one having a shape as shown in FIG. 4 is known. That is, a base 1 placed on a table, an arm 2 pivotally attached to the base 1 so that the tilt angle can be adjusted within one rotation surface, and a tip portion of the arm 2 And a combined lamp 3. The lamp 3 is provided so as to project in a direction substantially parallel to the rotating surface of the arm 2, and the amount of projection is relatively small. That is, as shown in FIG. 5, the rotating body 21 is coupled to the end portion of the arm 2 which is inserted into the base 1, and the bearing body 11 which pivotally supports the rotating body 21 on the base 1. Since the rotating body 21 is axially attached to the bearing body 11, the tilt angle of the arm 2 with respect to the base 1 can be adjusted. In this configuration, the load of the lamp 3 applied to the arm 2 becomes substantially equal on both sides of the rotation surface of the arm 2, and the arm 2 does not swing laterally with respect to the rotation surface, and the arm 2 is attached to the base 1. In contrast, it can rotate smoothly.

[Problems to be solved by the device]

The above configuration can be adopted when the lamp 3 has a point-shaped or planar light source, but when the lamp 3 has a linear light source, the amount of protrusion of the lamp 3 from the arm 2 is large. That is, since the moment acting around the shaft-attached portion of the arm 2 with respect to the base 1 becomes large, there arises a problem that the arm 2 cannot be supported at a desired angle. In order to avoid such a problem, it is conceivable to make the protruding direction of the lamp 3 orthogonal to the rotation surface of the arm 2, but in this case, a force that tilts the arm 2 with respect to the rotation surface. Therefore, there arises a problem that the arm 2 is inclined or the arm 2 cannot be smoothly rotated with respect to the base 1. SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and when the lamp is protruding in a form orthogonal to the rotation surface of the arm, the arm is not inclined with respect to the rotation surface and the arm is not inclined. An object of the present invention is to provide a lighting stand that can be smoothly rotated with respect to a base.

[Means for Solving the Problems]

In the present invention, in order to achieve the above-mentioned object, a base placed on a table and a base so that the tilt angle can be adjusted within one rotation surface substantially orthogonal to the upper surface of the base. In a lighting stand including an axially mounted arm and a lamp fixed to a tip of the arm so as to project in a direction substantially orthogonal to a rotation surface of the arm, the arm is tubular and has a base. Is provided with a rotating body at a fixed position inside the shaft-attached portion, and a cylindrical rotating cylinder protruding to the outer surface is provided, and the base is provided with a bearing body for pivotally supporting the rotating body so as to sandwich the rotating body. The upper surface of the base is provided with a supporting base projecting from the side surface of which a bearing hole into which the rotary cylinder is rotatably fitted is provided, and the center of rotation of the rotary body with respect to the bearing body and the rotary cylinder with respect to the bearing hole. The center of rotation is located on the same axis.

[Action]

According to the above configuration, the arm includes the rotating body in a fixed position inside and the rotating cylinder protruding to the outer side, and the rotating body is rotatably supported by the bearing body provided on the base and the base is provided. The rotation cylinder is fitted in the bearing hole of the support stand protruding from the top surface of the base, and the rotation center of the rotation body with respect to the bearing body and the rotation center of the rotation cylinder with respect to the bearing hole are positioned coaxially. Because
Since the first hinge is formed by the rotating body and the bearing body, and the second hinge is formed by the rotating cylinder and the bearing hole, the double hinges provide the rotating surface. Even if an external force that tilts the arm acts on the arm,
The arm does not tilt.

【Example】

The overall appearance is as shown in FIG. 3, and the base 1 is mounted so that the tilt angle can be adjusted in one rotation surface orthogonal to the upper surface of the base 1 placed on the table. The arm 2 is attached axially, and a lamp 3 is provided at the tip of the arm 2 so as to project in a direction orthogonal to the rotation surface of the arm 2. As shown in FIG. 1 (b), the base 1 has a recess formed in one place of a substrate 12 by fixing a back plate 13 which is a metal plate to the lower surface of a substrate 12 made of synthetic resin. A support 15 made of synthetic resin is fitted so as to cover 14. In the recess 14,
A bottom plate 16 to which a safety switch SW that turns off when falling is fixed is fixed, and a support base 15 is fixed to the bottom plate 16. The safety switch SW is inserted in the electric path from the plug 4 connected to the outlet of the commercial power source to the lighting circuit board 22 described later, and is connected to the power cord 5 connected to the plug 4 and the lighting circuit board 22. The connection line 7 connected to the connector 6 is connected. Therefore, if the base 1 falls, the safety switch SW is turned off and the lighting circuit board 22
The power supply to the lamp 3 is stopped and the lamp 3 is turned off. A part of the support 15 projects above the upper surface of the base 1, and an opening window 15a that opens upward is formed in the remaining part. Also, the support base 15
A bearing hole 17 is formed on the side surface facing the opening window 15a. A substantially U-shaped bearing body 11 is fixed to the bottom plate 16 at a position corresponding to the opening window 15a, and an adjusting metal fitting 18 is provided between the two leg pieces of the bearing body 11 at a corresponding position. The adjustment fitting 18 includes a pressure contact piece 18b that moves up and down as the adjustment screw 18a screwed from below moves forward and backward. As shown in FIG. 1 (a), the arm 2 has a pair of arm bodies 2a and 2b made of synthetic resin, and metal reinforcements that line the outer surface of one arm body 2b over almost the entire surface. Board 23
And a cover 24 made of synthetic resin that covers the reinforcing plate 23 to form a rectangular tube. As described above, the arm bodies 2a and 2b are made of synthetic resin to reduce the weight, and the metal reinforcing plate 23 is used to provide rigidity to prevent the arm 2 from being deformed by the load of the lamp 3. I am doing it. A rotating body 21 made of synthetic resin is fixed in the lower end of the arm 2 as shown in FIG. 1 (b). The lower end of the rotating body 21 is a bearing body inserted through an insertion window 25 opening at the lower end of the arm 2.
It is inserted between both leg pieces of 11 and is axially attached to the bearing body 11 by a shaft screw 26. The upper end of the rotating body 21 is fixed to the arm body 2a. On the other hand, on the outer side surface of the arm body 2a, a rotating cylinder 27 is provided so as to project into the bearing hole 17 formed in the side surface of the support base 15 so as to be rotatable. Here, the rotation center of the rotation cylinder 27 with respect to the bearing hole 17 is located coaxially with the rotation center of the rotation body 21 with respect to the bearing body 11. Therefore, as shown in FIG. 2, the arm 2 is provided with respect to the base 1 by a first hinge including the bearing 11 and the rotating body 21, and a second hinge including the bearing hole 17 and the rotating cylinder 27. It is rotatably attached by the shaft. Thus, as a result of the arm 2 being pivotally attached to the base 1 by the two hinges, the support strength of the arm 2 with respect to the base 1 is increased, and the arm 2 is prevented from tilting with respect to the rotation surface. You can do it. At the lower part of the rotating body 21, a pressure-contact piece of the adjustment fitting 18 inserted through the insertion window 25.
18b is elastically contacted, and the arm 2 can be stopped at an arbitrary inclination angle by the frictional force acting between the pressure contact piece 18b and the rotating body 21. Therefore, the lower portion of the rotating body 21 is formed in an arc shape so as to be in sliding contact with the pressure contact piece 18b in the tilt range of the arm 2. Further, the frictional force between the pressure contact piece 18b and the rotating body 21 is adjusted by the adjusting screw 18a. The connection line 7 described above is introduced into the arm 2 through the turning cylinder 27, and even if the distance between the arm 2 and the support base 15 is increased by some external force, the range of the length of the turning cylinder 27 is increased. Then, the connection line 7 can be covered and the connection line 7 can be prevented from being exposed. Also, the connecting line 7 is the arm 2
Since it is introduced into the arm 2 from the lower side surface of the arm 2, the rotation center of the arm 2 with respect to the base 1 can be brought closer to the base 1 as compared with the case where it is introduced from the lower surface of the arm 2. As a result, the amount of protrusion of both leg pieces of the bearing body 11 can be made small, so that wobbling of the arm 2 can be prevented more reliably. As shown in FIG. 1A, a lighting circuit board 22 for lighting the lamp 3 is mounted on the upper portion of the arm 2. Also,
A heat shield plate 28 that blocks the heat generated from the lighting circuit board 22 and prevents the arm 2 from being heated is disposed in the vicinity of the lighting circuit board 22. Power is supplied to the lighting circuit board 22 through the connector 6 coupled to the connection line 7. The circuit unit mounted on the lighting circuit board 22 is configured to detect the contact of the human body with the touch unit 22a and turn on the lamp 3.
The a is projected on the outer surface of the arm 2. The lamp 3 is connected to the upper end of the arm 2, and a straight tube fluorescent lamp 31 is used as a light source. Lamp 3
Is equipped with a metal mounting plate 33 to which a pair of sockets 32 for receiving the bases of the fluorescent lamps 31 are mounted. The mounting plate 33 passes through a mounting hole 29 provided at the upper end of the arm 2 and has a substantially L-shaped support fitting. It is fixed to the horizontal piece of 34. The vertical piece of the support fitting 34 is fixed to the inner peripheral surface of the arm body 2a together with the connecting fitting 35. The connecting fitting 35 connects both arm element bodies 2a and 2b. On the upper surface of the mounting plate 33, a holding plate 38 for holding the connecting wire 8 connected to one socket 32 separated from the arm 2 is attached. The mounting hole 29 has a circular shape, and one end of the shade 36, which is formed into a substantially cylindrical shape by connecting the upper shade 36a and the lower shade 36b, is detachably connected. The lower shade 36b is formed with an opening 36c for taking out the light emitted from the fluorescent lamp 31. The shade 36 is rotatable with respect to the arm 2 around the attachment hole 29, and by rotating the shade 36 with respect to the arm 2, the direction of the opening 36c can be changed to change the irradiation direction. I am doing it.

[Effect of device]

According to the present invention, as described above, the arm is provided with the rotating body in a fixed position and the rotating cylinder protruding to the outer side, and the rotating body is rotatably supported by the bearing body provided on the base. , The rotation cylinder is fitted in the bearing hole of the support stand protruding from the upper surface of the base, and the rotation center of the rotation body with respect to the bearing body and the rotation center of the rotation cylinder with respect to the bearing hole are coaxially positioned. Therefore, the first hinge is formed by the rotating body and the bearing body,
A second hinge is formed by the rotary cylinder and the bearing hole, and the double support of the hinge increases the support strength of the arm. Even if a large external force acts on the arm, the arm does not tilt.

[Brief description of drawings]

1 (a) is an exploded perspective view of an upper part showing an embodiment of the present invention, FIG. 1 (b) is an exploded perspective view of a lower part of the same, FIG. 2 is a sectional view of the lower part of the same, and FIG. FIG. 4 is a perspective view showing the overall appearance of the above, FIG. 4 is a perspective view showing a conventional example, and FIG. 5 is an exploded perspective view of the same. 1 ... Base, 2 ... Arm, 3 ... Lamp, 11 ... Bearing, 15 ... Support, 17 ... Bearing hole, 21 ... Rotating body, 27 ...
… Rotating cylinder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Shoko 37-4180 (JP, Y1) Shoko 36-31566 (JP, Y1) Shoko 60-29131 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A base mounted on a table, and an arm pivotally mounted on the base so that the tilt angle can be adjusted within one rotation surface substantially orthogonal to the upper surface of the base. In a lighting stand comprising a lamp whose one end is fixed to the tip of the arm so as to project in a direction substantially orthogonal to the rotating surface of the arm, the arm has a cylindrical shape and is attached to a base. Is provided with a rotating body at a fixed position inside thereof and a cylindrical rotating cylinder projecting to the outer surface, and the base is provided with a bearing body for axially supporting the rotating body in a manner of sandwiching the rotating body. A support base having a bearing hole on the side surface, into which the above-mentioned rotary cylinder is rotatably fitted, is projectingly provided, and the rotary center of the rotary body with respect to the bearing body and the rotary center of the rotary cylinder with respect to the bearing hole. Lighting stand consisting of and coaxially located.