JPH0324089Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elevating table used for drafting tables, medical machine mounting tables, etc.

[Conventional technology]

As shown in Japanese Utility Model Publication No. 56-36332, in the conventional lifting platform, a gas spring is placed inside the lifting tube, and the lifting tube is biased upward by the elastic force of the gas spring. has been done. When a drawing board is fixed to a support frame installed on the upper part of the elevator tube and a drawing machine is attached to the drawing board, the elevator tube is pressurized downward by the weight of the drawing machine. This downward force of the elevating tube is offset by the elastic upward force of the gas spring, and the elevating tube is balanced at an arbitrary height position. Thereby, the elevating cylinder can be moved up and down with a small external operating force, and can be kept stationary at an arbitrary height position. The elevator cylinder can be releasably fixed to the fixed leg by operating a brake device.

[Problem that the invention attempts to solve]

Before assembling the lifting platform, set the gas pressure of the gas spring to an appropriate value in advance according to the weight of the machine installed on the mounting plate, then set the gas spring in the lifting cylinder, and then , install the machine on the mounting plate. At this time, if the weight of the machine and the gas pressure of the gas spring do not match, and the elevating cylinder is not balanced, the elevating cylinder will move either upwards or downwards when the brake device releases the fixation. . When it is desired to readjust the gas pressure of the gas spring, the gas spring must be removed from the elevator cylinder, and furthermore, it is difficult to set the gas pressure of the gas spring to a value that balances the elevator cylinder.

The present invention aims to eliminate the above defects.

[Means to solve problems]

In order to achieve the above object, the present invention includes a cylindrical leg 4 erected on a base 2, a cylindrical elevating leg 6 fitted into the leg 4 so as to be able to rise and fall freely, and 6,4
The upper end engages with the upper part of the elevating leg 6 to urge the elevating leg 6 upward. a gas spring 20 with a valve 24, and a pressure adjustment guide hole 26 for inserting a gas venting device for the valve 24 from the outside on the side wall of the leg facing the valve 24. It has been established.

[Effect]

In the above configuration, the gas pressure of the gas spring 20 is set in advance to a value considerably higher than the value at which the elevating leg body 6 is balanced. After assembling the lifting platform and installing a drafting machine or the like on the upper part of the lifting leg 6, insert the gas venting device through the pressure adjustment guide hole 26, open the valve 24, and remove the gas spring 2.
Remove the gas inside 0. When the gas pressure inside the gas spring 20 decreases and the elevator cylinder is in a balanced state, the valve 24 is closed and the pressure adjustment guide hole 26 is closed.
Pull out the gas venting device. Thereby, the elevating leg 6 can be easily set in a balanced state.

〔Example〕

The configuration of the present invention will be described below with reference to embodiments shown in the accompanying drawings.

In FIG. 2, reference numeral 2 denotes a base, on which a square cylindrical external leg 4 is erected, a square cylindrical elevating leg 6 is loosely fitted to the external leg 4, and the elevating leg The body 6 is supported by a roller guide device (not shown) provided on the external leg 4 so as to be movable up and down. As shown in FIG. 1, a pair of mounting rods 10 (the other is not shown) are located in mounting holes formed on both upper side walls of the lifting leg 6 on both sides away from the center of the lifting leg 6. It is constructed like this.
Reference numeral 12 designates a head, the flange of which is in contact with the upper end of the lifting leg 6, and a screw 14 fitted into a hole in the flange is screwed into a screw hole formed in the mounting rod 10. The head 12 is fixed to the upper end of the elevating leg 6. A support frame 16 is attached to the head 12 via an inclination angle changing mechanism (not shown), and a mounting plate 1 is attached to the support frame 16.
8 is installed. A cover plate portion 12a is formed on the head 12, and a hexagonal hole 12b is provided through the center of the cover plate portion 12a. Reference numeral 20 denotes a commercially available gas spring that is placed in the center of the lifting leg 6 with a rod (not shown) facing downward. It is removably fitted into a fitting recess (not shown) formed at the center of the leg 4. A hexagonal head member 22 is fixed to the upper end surface of the gas spring 20, and the hexagonal head member 22 is fitted into the hexagonal hole 12b, and the gas spring 2
The upper end surface of 0 is in contact with the lower surface of the lid plate portion 12a. The gas spring 20 is connected to the hexagonal hole 12.
A valve 24 provided at the upper part of the gas cylinder 20 faces a pressure adjustment guide hole 26 formed through the upper part of the side wall of the internal leg 6.

Next, the structure of a known valve 24 will be explained with reference to FIG.

Reference numeral 25 denotes a tube screwed into the cylinder of the gas spring 20, into which a valve seat body 28 is internally fixed, and an operating rod 30 is slidably inserted into the valve seat body 28. Operation rod 30
A valve body 32 is fixed to the tip of the valve body 32, and a shield member 34 is placed inside the valve body 32. The valve body 32
The cylindrical portion of the gas spring 20 is fitted into the small diameter cylindrical portion of the valve seat body 28 by the gas pressure in the cylinder of the gas spring 20, and in this state, the inside of the cylinder of the gas spring 20 and the inside of the valve seat body 28 are connected. The time is cut off. A thread is formed on the outer periphery of the tube body 25. FIG. 4 shows a gas venting device, which is composed of a cylindrical body 36 having a thread formed on its inner circumferential surface and a rod 38 having a thread formed on its outer circumference.

Next, the operation of this embodiment will be explained.

The gas pressure inside the gas spring 20 is
Set it much stronger than the appropriate value considering the weight of the machine installed above. This gas spring 20 is set in the state shown in FIG.

Next, a machine such as a drafting machine or a medical machine is mounted on the mounting plate 18. In this state, the lifting leg 6 attempts to descend against the elasticity of the gas spring 20 due to the weight of the machine on the mounting plate 18, but because the gas pressure of the gas spring 20 is strong, the lifting leg 6 is strongly urged upward, and the elevating leg 6 maintains its highest position.

Next, the cylindrical body 36 is inserted through the pressure adjustment guide hole 26 as shown in FIG. 4, and the cylindrical body 36 is screwed onto the outer periphery of the tubular body 25 of the valve 24 and fixed. Next, the rod 38 is screwed into the inner peripheral thread of the cylinder body 36, the rod 38 is rotated, the tip of the rod 38 is advanced into the tube body 25, and the operation rod 30 is inserted into the third In figure b, push to the left. When the operating rod 30 is pushed, the valve hole formed by the facing portion of the cylindrical portion of the valve body 32 and the small diameter cylindrical portion of the valve seat body 28 opens as shown in FIG. 3b.
The gas inside the cylinder of the gas spring 20 flows out to the outside, and the gas pressure inside the cylinder decreases. When the gas pressure in the cylinder of the gas spring 20 becomes appropriate, that is, the upward force of the lifting leg 6 due to the repulsive force of the gas spring 20 and the downward force of the lifting leg 6 due to the weight of the machine are exactly balanced. When the elevating leg 6 can be raised and lowered by a small external operating force and the height of the mounting plate 18 can be easily adjusted, the rod 38 is rotated in the opposite direction, and the operating rod 30 is moved by the rod 38. Release the pressing force against. As a result, the operating rod 30 is moved to the right in FIG. 3 by the gas pressure in the cylinder of the gas spring 20, the valve hole is closed, and the outflow of gas from the cylinder of the gas spring 20 is stopped.

Next, the cylinder 36 is taken out from the valve 24. As a result, even if the elevating tube 6 is released from being fixed by a brake device (not shown), the elevating tube 6 does not suddenly fall due to the weight of the machine and remains stationary.

In implementing this embodiment, the internal leg may be erected on a base, and the external leg may be fitted into the internal leg so as to be movable up and down. Alternatively, the gas spring may be formed with the cylinder facing downward, and a pressure adjustment guide hole may be provided in the side wall of the fixed leg body facing the valve.

〔effect〕

As mentioned above, in this invention, the gas pressure of the gas spring is set to a high level in advance, and with the machine installed on the lifting platform, the gas from the gas spring is removed by external operation, and the gas pressure is adjusted to the appropriate value. If the gas release is stopped when the lift is exhausted, there is an effect that the elevating legs can be easily set in a balanced state.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is an overall front view of the lifting platform, FIG. 3 is an explanatory view, and FIG. 4 is a sectional view of the degassing device. 2...Base, 4...External leg body, 6...Elevating leg body, 12...Head, 16...Support frame, 18...
Placement plate, 20... Gas spring, 22... Hexagonal head member, 24... Valve, 25... Pipe body, 26...
...Pressure adjustment guide hole, 28...Valve seat body, 30...
Operation rod, 32... Valve body, 34... Shield member.

Claims (1)

[Scope of utility model registration request] A cylindrical leg 4 erected on the base 2, and the leg 4
A cylindrical elevating leg 6 is fitted into the elevating leg 6 so as to be able to rise and fall freely, and the elevating leg 6 is disposed within the legs 6 and 4, and its upper end engages with the upper part of the elevating leg 6 to raise and lower the elevating leg 6. a gas spring 20 with a valve 24 that urges upward;
A lifting platform characterized by having a pressure adjustment guide hole 26 for inserting a gas venting device for 4 from the outside.