JPS63131402A - Lighting stand for drafting - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lighting stand for drafting, which is suitable for illuminating a drafting desk or the like that is used with its top surface tilted with respect to the floor.

[Conventional technology]

Drafting desks are generally used with the desk top tilted relative to the floor, and lighting is required to be able to illuminate any location on the desk top with the necessary brightness. Therefore, the lighting stand for drafting is
The light body can be moved to any position on the desk surface and tilted at any angle, and the device (brake mechanism) for adjusting the tilt angle of the light body is the key to the structure of the drafting light stand. It has become.

A conventional example of a tilt angle adjustment device for a general drafting lighting stand is shown in FIGS. Since it has a structure that can be tilted at any angle to the side or opposite side, the structure of the lower end of the support column 23, which is the axis of rotation, is
As shown in FIG. 2, the support 23 is sandwiched from above and below by stoppers 24 and 25 made of a material different from that of the support 23, and the stopper 24 is tightened with a tightening screw 81.
．． The rotation of the support 23 is braked by the frictional force between the support 25 and the surface of the support 23.

FIG. 13 is a diagram showing a conventional example of a lighting stand for drafting in which the lamp body 1 is supported by two pillars 31.
1 holds an arbitrary irradiation position by means of a frictional force using a fastener 32, similar to the conventional example described above.

Note that when the two supports 31 are tilted by an angle θ, the direction of the lamp 1 is always kept parallel to the desk top surface as shown in FIG.
No. 214). This is because the lengths of the two pillars 31 are the same, and in order to change the angle of the lamp body 1, the two pillars 31 are once joined by the joining body 22, and the length of the joining body 22 is
This problem is solved by pulling out one arm 21 again and connecting it to the lamp body 1.

As an angle adjustment device for the support column 31 in the above-mentioned drafting lighting stand, there is a method that utilizes the tightening action of a coil spring, as shown in Japanese Patent Laid-Open No. 59-201302.

Furthermore, in JP-A No. 59-201303, the structure is such that plate members are inserted and tightened.
In No. 304, the angle is adjusted by a combination of a first brake mechanism and a second brake mechanism.

[Problem that the invention seeks to solve]

The conventional technology described above adjusts the inclination of the support only by using frictional force, but as it is repeatedly erected and tilted, the screws loosen and the frictional force weakens when tightening. Consideration has been given to tightening with a frictional force that is unrelated to changes in the moment of the lamp body that occur during use, but there is a risk that the lamp body will suddenly fall forward, and because it is always tightened with a large frictional force. However, there was a problem in that the operability of moving the lamp was poor.

SUMMARY OF THE INVENTION An object of the present invention is to obtain a lighting stand for drafting, which eliminates the above-mentioned problems, has good operability, and is less dangerous due to sudden changes.

[Means for solving problems]

The above purpose is to use two pillars of different heights, and to create a space between the taller pillar that supports the lamp and the other pillars.

This is achieved by connecting via a compressible spring.

[Effect]

The operation of the above means will now be explained with reference to FIG.

A first support 3 having a height Ql and a second support 4 having the same shape and a height h lower than nl are curved in a two-figure shape, and a second support 4 has a height h lower than nl. It is mounted on the rotating shaft so as to rotate about 1 and k2. When the lamp attached to the support post 3 is used by drawing it closer to the user, the lamp body changes from the upright state A to the state B and then to the state C, and the difference n0 between Q□ and Q2 gradually increases as shown in the figure. That is, n0 → na + n1 → n, +n2 (however, n2>nl), and when connecting both ends of the tension spring to the upper horizontal arms of the pillars 3 and 4, the state B and then state C are reached. At this time, a return force acts on the tension spring, and the struts 3 and 4 each try to return to their original state A. Note that the moment Wcosθ of the lamp body becomes Wcosθa−+Wcos as the first support 3 tilts.
As θC increases, the return force of the spring also increases accordingly, which acts in a direction to maintain balance. Therefore, the frictional force required for tightening the brake mechanism at the rotating shafts of the pillars 3 and 4 and the shaft 2 is less than that of the drafting lighting stand with no spring structure as described above.
Since the return force of the spring is also added, the operating force of the first support column 3 may be light. FIG. 16 is a side view of a normal drafting table 9 used in an inclined manner, and the moment of the lamp body 1 becomes maximum when the support 3' becomes parallel to the floor surface 101. If the brake mechanism on the support 3' becomes loose, the lamp 1 will fall on top of the worker 100, so the support 3'
It is better to provide a force to prevent the lamp body 1 from falling within the range of the rotation angle θ9. However, as shown in FIGS. 17 to 19, when looking at the usage angle of the lighting stand when the drafting table 9 changes from a horizontal state to a vertical state, it is found that the actual operating angle range is often in the range θβ. I understand. That is, within the range of the angle θβ, it is necessary to apply a force to the support column 3' to prevent the spring from returning to its original position. The movable range of the support 3' excluding the above θβ from the movable range θ is actually difficult to move, and unless the drawing board 9 is placed close to vertically in an extreme case, there is no practical problem even if the fall restraining force is eliminated. Since the amount of friction is small, frictional tightening can be achieved using only force.

Next, we will explain the reason why a spring is installed at the highest part of the support column to obtain a fall-preventing force. FIG. 20 shows a locking fitting 6 provided on a part of the clamp 8 that is clamped to the base, that is, the drafting table 9.
3 is a diagram showing an example in which a spring 62 is attached at a position of a rotary swing 39 at a distance Q from the rotation axis of the support 3 to provide a force for preventing the lamp body 1 from falling. In the above example, if the falling moment of the lamp 1 is to be restrained by the spring 62, the height L of the support 3 is several times longer than Q, so the force of the spring 62 must be made several times the lamp load. Not the point. In addition, as shown in (a) in FIG. 21, a state is shown in which the column 41 is connected with a low height column 41 below the column 3 by a spring 6, but the spring 6 is attached to the upper part of the column 3 (b ) compared to
After all, a spring 6 that is several times stronger is required, which is actually impossible. As is clear from these examples, it is more rational to connect the spring that connects the two supports at a position as high as possible on the support to which the lamp body is attached.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing an embodiment of a lighting stand for drafting according to the present invention, Fig. 2 is a view showing a connecting portion between the lamp body and the support of the above embodiment, and Fig. 3 is a front view of the above embodiment. , Fig. 4 is a diagram showing another example of the connecting part between the lamp body and the support, Fig. 5 is an explanatory diagram showing the connection of two supports by an elastic ring, and Fig. 6 is a diagram showing the connection of the two supports. FIG. 7 is a diagram showing the packaging state of the above embodiment; FIG. 8 is a diagram showing the packaging state when the support and lamp body are combined; FIG. 9 is a diagram showing the packaging state of the arm and support. FIG. 10 is a diagram showing an example of another method of connecting the arm and the support.

In Fig. 1, a lamp body 1 equipped with a lamp has an arm 2 attached to a part of a first support 3 made of a pipe curved in a U-shape.
The other end of the support column 3 is attached to a clamp 8 which is held as a base by a mounting screw 82 on a drafting table 9 so as to be rotatable about the pipe shaft with a friction control means. ing.

The arm 2 is connected to the first support 3 via a connector 28 as shown in FIG.
As shown in the figure, the lamp body 1 slides and moves along the arm 2. The first support 3 in the clamp 8 is attached to a second support made of a pipe which is curved in a hollow shape and whose height is lower than that of the first support 3 at a distance m from the position. 4 is attached rotatably around the pipe axis like the above-mentioned support column 3. The horizontal length Ω of the strut 3 protruding from the surface of the clamp 8 is longer than the similarly protruding horizontal length Q4 of the strut 4, the horizontal upper arm of the strut 4 is shorter than that of the strut 3, and A power cord 85 inserted through the inside of the lamp body 1 comes out from the opening of the horizontal upper part and is connected to the inside of the lamp body 1 by an elastic cord (curl cord) 5. A plug 86 is attached to the tip of the power cord 85. Also.

The horizontal upper arm portion of the strut 3 and the horizontal upper arm portion of the strut 4 are connected by a coil spring 6.

In the drafting lighting stand configured as described above, when the first support 3 is tilted forward, the upper arm of the first support 3 and the upper arm of the second support 4 are connected as shown in FIG. Since the distance increases and the coil spring 6 stretches, the restoring force of the coil spring 6 suppresses the lamp body 1 from falling. Incidentally, the coil spring 6 may be attached as shown in FIG. 4. In FIG. 4, a rotating crank 33 attached to the second support 4 is provided with a slider 31 that slides along the support 4, which strengthens the holding force of the first support 3 to the lamp body 1. This is one way to do so. FIG. 5 shows an elastic ring 61 such as a rubber ring instead of the coil spring 6.
An example is shown in which the above-mentioned supports 3.
Since the vertical position of the upper arm hardly changes, it can be used when you do not want to damage the surfaces of the supports 3 and 4.6 Figure 6 shows the second support 35 to which the lamp body 1 is not attached. FIG. 6 is a diagram showing an example in which the lamp body 1 is prevented from falling by using a long coil spring 62 instead of the spring 61 with a very low rising height. In this case, the power cord 51 coming out of the lamp body 1 passes through the coil spring 62 and is stored in the support column 35.In this embodiment, the lamp body 1 and the first support column 3 are structured so that they can be separated. The arm 2 attached to the lamp body 1 and the first support 3 are connected by a connector 28', as shown in FIG. 7, because it is disassembled and packaged.
The packaging box 103 is smaller than the packaging box 102 shown in FIG. 8 when it is not disassembled, reducing costs and making handling convenient.

As a method of connecting the first support column 3 and the arm 2, methods as shown in FIGS. 9 and 10 may also be considered. In the method shown in FIG. 9, a power cord 86 is passed through the first support 3 and led to the lamp body 1 via the arm 2.
When connecting the power cord 86 to the arm 2, the power cord 86 must be pulled into the first support 3 while being connected, which is extremely difficult to do and there is a risk of damaging the power cord 86. In addition, in the method shown in FIG. 10, the power cord 87 is inserted through the first support 3, but the power cord 87 is separated at the connecting portion, and each is connected to the first support through the bush 11 in front of the connecting portion. 3 and the outside of the arm 2, and are connected using connectors 88 and 89, which eliminates the disadvantages of the method shown in Fig. 9. As the number of points increases, it is inevitable that the assembly work becomes complicated.

In a drafting lighting stand, since it is necessary to maintain the illuminance on a wide drafting table above a required value, it is generally practiced to make the lamp body 1 movable by sliding it along an arm 2. By moving the lamp 1, it becomes necessary to extend and contract the power cord, but in this embodiment, as described above, the power cord 85 is connected to the second support 4, which is lower in height and has a shorter upper arm. Since the elastic cord 5 connects the opening of the upper arm part to the lamp body through the inside of the arm, the elastic cord 5 does not stretch or contract even if the lamp body 1 moves along the arm 2. Furthermore, even if the first support column 3 is removed from the arm 2 and stored during packaging, the elastic cord 5 can remain as it is without causing any trouble.

The above drafting lighting stand has a structure that is suitable for illuminating a drafting table, but the above structure is also suitable for medical and other work, especially as a lighting stand for work surfaces that are perpendicular to or inclined to the floor. It is possible to demonstrate the functional effects of the paddle.

〔Effect of the invention〕

As described above, the lighting stand for drafting according to the present invention includes a lamp body that holds a light source, a column that supports the lamp body at one end, and a support that supports the other end of the column so that it can rotate freely against friction. The installation is done on a drafting lighting stand with a base.
The above-mentioned support is the first support, and the second support, which is shorter than the first support, is rotatably placed at a position slightly distant from the first support on the base. By connecting the first and second pillars near their respective tops with coil springs, the lamp can be moved with light operation, and even if the friction tightening screw at the base of the pillar loosens, the lamp will not move suddenly. without falling down.

The above effect can be maintained even if the drafting table is tilted to a vertical position. In addition, since two pillars are provided and these pillars are connected by a coil spring, it can withstand vibration and reduce the shaking of the lamp body during use.
By inserting the power cord through the pillar, it has the advantage of being able to be disassembled and packaged.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of a lighting stand for drafting according to the present invention, Fig. 2 is a view showing a connecting portion between the lamp body and the support of the above embodiment, and Fig. 3 is a front view of the above embodiment. , Fig. 4 is a diagram showing another example of the connecting part between the lamp body and the support, Fig. 5 is an explanatory diagram showing the connection of two supports by an elastic ring, and Fig. 6 is a diagram showing the connection of the two supports. FIG. 7 is a diagram showing the packaging state of the above embodiment; FIG. 8 is a diagram showing the packaging state when the support and lamp body are combined; FIG. 9 is a diagram showing the packaging state of the arm and support. 10 is a diagram showing another example of a connection method between an arm and a support, FIG. 11 is a front view of a conventional drafting lighting stand, and FIG. 12 is a support base of the above-mentioned conventional example. 13 is a diagram showing another example of the conventional drafting lighting stand. FIG. 14 is a functional explanatory diagram of the above conventional example.
Figure 5 is a functional explanatory diagram of the drafting lighting stand of the present invention, the first
Figure 6 is a side view showing how the lighting stand for drafting is used, Figures 17 to 19 are diagrams showing how each of the lighting stands is used, and Figure 20 shows another example of a method for preventing the lamp from falling. Figure 21 is an explanatory diagram showing still another example of a method for preventing the lamp from falling, where (a) is a diagram with a coil spring installed at the bottom, and (b) is a diagram with a coil spring installed at the top. be. 1... Light body 3... First support 4...
・Second pillar 6... Coil spring 8... Mounting is on base (clamp) 85... Power cord representative patent attorney Junnosuke Nakamura 4: 2nd madness 6; Severely injured Courteau, Figure 3 Figure 4Figure 9Figure 10Figure 11Figure 13Figure 16Figure 17Figure 20

Claims (1)

[Claims] 1. A lamp body that holds a light source, a column that supports the lamp body at one end, and a mounting base that supports the other end of the column so that it can rotate freely against friction. In the drafting lighting stand, the above-mentioned support is used as a first support, and a second support, which is shorter than the first support, is rotated at a position horizontally distant from the first support support of the mounting base. A lighting stand for drafting, characterized in that it is movably provided and the first support and the second support are connected near the top of each with a coil spring. 2. The lighting stand for drafting as set forth in claim 1, wherein the second support has a power cord inserted into the inside of the support.