JPS5920122Y2 - Centering mechanism of height adjustment device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a telescopic cylindrical elevating device used for drafting tables, chairs, etc., and enables easy placement and replacement of elongated telescoping devices such as gas springs. It is characterized by:

The structure of the present invention will be described in detail below with reference to an embodiment of a drafting table shown in the accompanying drawings.

Reference numeral 1 designates a base of a drafting table 2, on which a cylinder 3 is erected and fixed, and a ring 5 fixed to the inner wall surface of the upper end of the outer cylinder 4 is screwed into the threaded part 3a of the cylinder 3. are doing.

An elevating cylinder 6 is disposed inside the cylinder 3, and the outer wall surface of the elevating cylinder 6 is slidable on the upper and lower inner wall surfaces of a bushing 7 and a brake cylinder 8 that protrude from the inner wall surface of the ring body 5. are facing each other.

The upper end tapered surface 8a of the brake cylinder 8 is connected to the ring body 5.
The lower end tapered surface 8b of the brake cylinder 8 is in contact with the tapered surface of an annular body 9 disposed between the elevating cylinder 6 and the cylinder body 3.

The ring body 9 has a support cylinder 1 that fits into the inner wall surface of the cylinder body 3.
It is supported on the upper end surface of 0.

The lower end of the support tube 10 is placed on the upper surface of the horizontal leg rod 1.

Reference numeral 11 denotes a bundle projecting from the lower part of the outer cylinder 4 in a right angle direction.

The threaded portion 3a of the cylinder 3, the outer cylinder 4, the ring body 5, the brake cylinder 8, the ring body 9, and the support cylinder 10 are used to releasably fix the elevating cylinder 6 to the cylinder body 3 side. It constitutes a brake mechanism.

Incidentally, various general brake mechanisms are known as the brake mechanism, and the present invention is not limited to the one shown in the drawings.

Reference numeral 12 denotes a female threaded pipe fitted and fixed to the inner wall surface of the upper end of the elevating tube 6; 13 is a mounting member rotatably fitted to the upper end of the elevating tube 6; the inner periphery of the upper end of the tube portion 13a of this A convex portion 13a' is provided in a protruding manner, and the lower surface of the convex portion 13a' is in contact with the upper end of the female threaded pipe 12.

Reference numeral 14 denotes a cap having a tapered recess 14a formed on its lower surface, and a fitting hole 14C having a horizontal surface 14b formed at the top of the recess 14a.

When the threaded portion 14d of the cap 14 is screwed into the female threaded pipe 12, the lower surface of the flange 14e of the cap 14 comes into contact with the upper surface of the female threaded pipe 12, and the flange 14
The outer circumferential surface of e is in contact with the circumferential surface of the convex portion 13a', and
The lower surface of the flange 14f comes into contact with the upper surface of the convex portion 13a'.

In this state, the center of the fitting hole 14C is set to coincide with the center of the elevator tube 6.

Note that the protrusion 13a' can rotate along the outer peripheral surface of the flange 14e.

Reference numeral 15 denotes an elongated telescopic resilient means made of a known gas spring disposed within the elevating tube 6, and the lower end of the piston rod 15b is located at the center of the elevating tube 6 on the bottom surface of the base 1. It is removably fitted into an engaging portion 22 which is formed in an annular recess.

Cylinder 15 of the spring device or gas spring 15
The upper end face of the diameter-reduced upper part a is set to abut on the horizontal surface 14b.

C is a pin member that is slidably fitted into the fitting hole 14C, and the tip of the stopper screw 16 is located in the circumferential groove d of this pin member.

17 is a fixing screw that is screwed into a screw hole (not shown) provided perpendicularly through the tube portion 13a of the mounting member 13;
The tip of this is opposed to the side surface of the elevating cylinder 6, and a bundle 18 is fixed to the rear end.

Reference numeral 19 denotes a horizontal rod, which is fixed to the mounting portion 13' of the mounting member 13 via a U pole 20, and a rod 21 for the plate holder is fixed to the horizontal rod 19. A plate (not shown) is placed and fixed thereon.

Next, the operation of this embodiment will be explained.

First, the elevator tube 6 is raised to the highest position, and the brake mechanism is operated to fix the elevator tube 6 to the cylinder body 4.

Next, the telescopic elastic device 15 is inserted into the elevating tube 6 from the upper part of the elevating tube 6, and the lower end of the piston rod 15b of the gas spring 15 (telescopic elastic device) is attached to the retaining portion 22 on the bottom surface of the base 1. Fit and place.

Next, when the cap 14 is placed on the female threaded pipe 12, the upper end of the cylinder 15a comes into contact with the tapered surface of the tapered recess 14a of the cap 14.

When the threaded portion 14d of the cap 14 is screwed onto the female threaded pipe 12 until the lower surface of the flange 14e contacts the upper end of the female threaded pipe 12, the diameter-reduced upper portion a of the cylinder 158 is placed at the top of the tapered recess 14a. The reduced diameter upper part a is inserted into the fitting hole 14C, and the upper end surface of the cylinder 153 comes into contact with the horizontal surface 14b.

As a result, the telescopic resilient means 15 (gas spring) is supported at the center of the elevating cylinder 6.

In this state, if the brake mechanism is operated to release the fixation to the elevating tube 6, the elevating tube 6 can move up and down with respect to the cylinder body 3. Therefore, if the elevating tube 6 is lowered, the cylinder 15
a is the cylinder 15 along the piston rod 15b.
It descends against the pressure of the gas in a.

If the elevating cylinder 6 is lowered along the cylinder body 3, and the bundle 11 is rotated in the horizontal rotation direction at an arbitrary lowered position, and the outer cylinder 4 is rotated, the outer cylinder 4 is lowered along the threaded portion 3a. Then, the tapered surface of the ring body 5 presses against the tapered surface 8a of the brake cylinder 8,
The inner wall surface of the brake cylinder 8 is pressed against the outer wall surface of the elevating cylinder 6 to apply a brake to the elevating cylinder 6, and the elevating cylinder 6 is fixed to the cylinder body 3 at an arbitrary lowered position.

Note that FIGS. 1 and 2 show a state in which the elevating cylinder 6 is fixed at the lowest position.

By rotating the tube portion 13a of the mounting member 13 around the elevator tube 6, the horizontal rod 19 can be rotated in the horizontal direction.

By rotating the bundle 18 and bringing the fixing screw 17 into pressure contact with the outer wall surface of the elevating tube 6, the mounting member 13 is fixed to the elevating tube 6,
The horizontal rod 19 can be tested at any horizontal rotation angle.

In this embodiment, the gas spring 15 is used as a telescoping device that springs the elevator tube 6 upward, but the present invention is not limited to this. Any elongated, stretchable material that emits light may be used.

In this embodiment, the tapered recess 14a is formed on the lower surface of the cap 14, but the cap 14 only needs to have a surface that receives at least the end surface of the telescoping device 15.
The tapered recess 14a may not be provided.

Further, the telescopic elastic device 15 can sufficiently urge the elevating tube 6 upward even if it is not positioned precisely at the center of the elevating tube 6.

As mentioned above, the present invention uses a triple structure of the cylinder, the elevating tube, and the telescopic triggering device, and the telescopic triggering device is placed inside the elevating tube, so the mechanism is simple and the appearance is extremely simple. It is possible to provide an elevating device, which is ideal as an elevating device for a drafting table or a chair, etc., and furthermore, the base is provided with a retaining portion for receiving one end of the elongated telescoping device, and the upper end of the elevating tube is A cap for supporting the other end of the telescoping device is removably provided, and the retaining portion and the cap support both ends of the telescoping device, and the elasticity of the telescoping device allows the device to be raised and lowered. Since the cylinder is configured to spring upward, there is no screwing or welding applied to the telescoping device, so the telescoping device can be easily installed by removing the cap from the top end of the elevating tube. There are effects such as being able to exchange items.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show a preferred embodiment of the present invention, in which Fig. 1 is a front view, Fig. 2 is a front view of main parts, Fig. 3 is an external view of the cap, and Fig. 4 is a front view of the main parts.
The figure is a front view of the lower part of the drafting table, and FIG. 5 is an external view of the upper part of the drafting table. 1...Base, 2...Drawing table, 3...
...Cylinder, 4...Outer cylinder, 5,9...
- Ring body, 6... Elevating tube, 8... Brake tube, 8a... Tapered surface, 8b...
Tapered surface, 10...Support tube, 11...
・Bundle, 12... Female threaded pipe, 13...
...Mounting member, 14...Cap, 14a...
Curved tapered recess, 14C... Fitting hole, 15.
・・・・・・Slender telescopic elastic device (gas spring), 1
5a...Curved cylinder, 15b...Piston rod, 19...Curved horizontal rod, 21...Curved rod, 22...
・Engagement part.

Claims (1)

[Scope of utility model registration request] A cylindrical body 3 is set upright on a base 1 placed on a floor surface, and one end of an elongated telescopic elastic device 15 is detachably attached to the base 1, with the cylindrical body 3 positioned approximately on the central axis of the cylindrical body 3. A retaining part 22 for positioning is provided, and the elevating tube 6 is fitted into the cylinder 3 so as to be able to rise and fall freely, and the elevating tube 6 is placed between the elevating tube 6 and the cylinder 3 on the side of the cylinder 3. A cap 1 is provided with a brake mechanism for removably fixing the hook, and has a surface at the upper end of the elevating tube 6 to receive the other end of the elongated telescoping resilient means 15.
4 is removably fitted and fixed thereto, and the elongated elastic elastic device 15 is disposed between the cap 14 and the engaging portion 22.