JPH10327968A - Chair raising and lowering control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the raising and lowering of a chair without using pneumatic power by moving a support shaft connected to a chair upward with the elastic force of a spring member, applying pressure to the chair, and compressing the spring member to store elastic force. SOLUTION: A spring member 9 and a support shaft 7 are put in sequence in a barrel 1, a lower hard ring body 5B, a soft ring body 6, and an upper hard ring body 5A are inserted in sequence on the support shaft 7, and a lower hard washer 4B and an upper hard washer 4A are added between the lower hard ring body 5B and an inner flange 12 and on the upper hard ring body 5A respectively as required. A drive rod 8 is moved downward, and the support shaft 7 is pushed upward by the elastic force of the spring member 9. When downward force is applied to the drive rod 8 to press a chair, the chair is lowered by the compressed spring member 9, and the elastic force of the spring member 9 is stored. The high and low position of the chair is thus adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair lifting control device. It is a chair elevating control device having a simple structure that does not require a special power unit, and reducing the failure rate and the production cost in the chair elevating control structure.

[0002]

2. Description of the Related Art As is well known, a chair having a height adjusting function utilizes a device for controlling the elevation of a chair. A separate air drive device is provided on a support shaft on the lower surface of the chair and mounted on the air drive device. By moving the handle in one direction, the air drive device moves the support shaft upward. When you release the handle, the support shaft stops, and when you lift the handle in the other direction,
The air drive device is in a state of being loosened downward. At this time, the height of the chair can be adjusted by applying strong pressure downward the chair, and the support shaft is stopped when the handle is released. Thus, the height of the chair is adjusted. However, the familiar air-adjustable chair requires pneumatic power, so its structure is relatively complicated and its failure rate and production cost are relatively high. The present invention proposes a chair lifting / lowering control device which has a relatively simple structure, does not require air pressure power, is low cost, and is hard to break down.

[0003]

SUMMARY OF THE INVENTION The main object of the present invention is to:
Utilizing the elasticity of the spring member, the support shaft connected to the chair is moved upward to apply pressure to the chair while compressing and accumulating the spring member. The object of the present invention is to propose a chair elevating control device for controlling elevating. The next object of the present invention is to lift the drive rod and fit the cam portion provided at the tip of the drive rod exactly to compress the soft ring on the support shaft, and radially expand the soft ring center hole. When the working force clamps the outer periphery of the support shaft and fixes it, and loosens the handle, the soft ring is no longer in the state of clamping and fixing the support shaft, and the elevation of the support shaft can be adjusted. It is to propose.

[0004]

In order to solve the above-mentioned problems, a chair lifting / lowering control device of the present invention is provided below a seat bracket and between a support base to adjust the height of a chair. The apparatus includes a support shaft inserted into a barrel, a soft ring provided on the support shaft, the upper and lower ends of the soft ring are positioned, and a spring member is provided between the support shaft flange and above the barrel bottom. Attach so that the support shaft moves elastically upward. A driving rod is connected to the upper end of the barrel by a shaft, and a cam portion is provided at the tip of the driving rod. The elevation of the chair is adjusted by moving the support shaft in the axial direction. When the drive rod is lifted, the cam portion presses the soft ring, whereby the inner diameter of the center hole of the soft ring sandwiches and fixes the outer periphery of the support shaft, and the support shaft is fixed at a desired height. .

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the chair lifting / lowering control device of the present invention is provided between a seat bracket 100 and a support base 2 to adjust the height of a chair. The seat 101 is located above the seat bracket 100, and the socket 21 is located above the center of the support base 2.
The lower portion is supported by several deploying legs 22, and casters 23 are provided below each of the deploying legs 22.
Attach to help move the chair. The chair lifting / lowering control device proposed by the present invention basically includes a barrel 1, a grip bracket 3, an upper hard ring 5A, a lower hard ring 5B, a soft ring 6, a support shaft 7, a driving rod 8, and a spring member 9. Including.
The barrel 1 is provided with an inwardly facing internal flange 12 (see FIGS. 3 and 4) at an appropriate height on the inner side surface thereof, and is provided with a screw portion 11 at its upper end and the support base 2 at its lower end.
Into the socket 21. The spring member 9 is attached to the inside bottom of the barrel 1. The support shaft 7 is a cylindrical body, the lower end of which has a flange 71, the upper end of which is provided with a screw hole 73, which is coupled to the extension shaft 70 with a screw 72, and then a column hole below the seat bracket 100 (see FIG. 1). The flange 71 at the lower end of the support shaft 7 is located at the upper end of the inner spring member 9 of the barrel 1, and the support shaft 7 elastically rises by the action of the spring member 9.

According to the present invention, the lower end of the seat bracket 100 is positioned at the upper end of the support shaft 7 so as to satisfy the demand for use of the chair that can rotate freely. A small diameter portion 701 and a protruding portion 702 (see FIG. 2) are sequentially provided on the upper portion. After the extension shaft 70 is inserted and coupled to the upper end of the support shaft 7, the extension shaft 70 is screwed to the upper end of the support shaft 7, is hooked by the small diameter portion 701, and is rotatable. The shaft 7 is the projection 7
It can be inserted up to the position where it stops at 02. When the upper half taper 703 of the extension shaft 70 is inserted into the seat bracket 100, the chair can be freely rotated. Upper rigid ring 5A,
The lower rigid ring 5B is made of metal or plastic steel, and is placed in the barrel 1. Therefore, the outer diameter of the lower rigid ring 5B is opposite to the inner diameter of the barrel 1.
Is inserted in the barrel 1 so as to be located above the inner flange 12, and a center hole 50 for passing the support shaft 7 is provided at the center of the lower rigid ring 5B. The outer diameter of the soft ring 6 is made to correspond to the inner diameter of the barrel 1, and the inner diameter is
A lower rigid ring body 5B having a central hole 60 facing the outer diameter;
So that it is located on the top of the The upper rigid ring 5A and the lower rigid ring 5B have the same structure, and are provided with a central hole portion 50 through which the support shaft 7 is housed, so that the upper rigid ring 5A is located on the upper surface of the soft ring 6. Fit into barrel 1.
As described above, the spring member 9 and the support shaft 7 are placed in the barrel 1 in order, and the lower hard ring 5B, the soft ring 6, and the upper hard ring 5A are fitted on the support shaft 7 in order. Accordingly, a lower hard washer 4B and an upper hard washer 4A are added between the lower part of the lower rigid ring 5B and the upper part of the inner flange 12 and above the upper rigid ring 5A, respectively. An inner thread portion 31 corresponding to the barrel 1 screw portion 11 is provided at the lower end of the holding bracket 3 to firmly fix the holding bracket 3 to the upper end of the barrel 1, and the upper hard ring 5 </ b> A or the upper hard washer 4 </ b> A is detached from the barrel 1. To prevent A cut 30 is provided at the upper end of the grip bracket 3, and symmetrical shaft holes 32 are formed on both side surfaces of the cut 30.
Is provided. One end of the drive rod 8 has a U-shape and has a fork member 81. A cam portion 810 is formed at the tip of the fork member 81, and a symmetric shaft hole 811 and a shaft hole provided in the fork member 81 are formed. 32, the shaft member 33 is passed through, and both shoulders of the fork member 81 are respectively connected to both side surfaces of the grip bracket 3, and the cam portion 810 is connected to the upper hard washer 4
A Contact the upper surface. Hold the drive rod 8 with the bracket 3
The shaft member 33 has a large-diameter portion 3
31, a middle diameter portion 332, and a screw portion 333 are made (see FIG. 2).

When the upper hard ring 5A or the upper hard washer 4A is pressed down by the cam portion 810 of the drive rod 8 to achieve the expected degree, the symmetrical movement between the gripping bracket 3 and the fork member 81 of the drive rod 8 is achieved. In order to securely fix the drive rod 8 at a fixed position, the position is not changed even when receiving a considerably large external force. Once the height of the chair is adjusted, the fixed position does not change. The barrel 1 assembled by the above components is fitted into the fitting hole 20 of the socket 21 of the support base 2. A spring member 9 and a support shaft 7 are inserted into the barrel 1 in order, and a lower rigid ring 5B, a soft ring 6 and an upper rigid ring 5A are fitted into the support shaft 7 in order. An upper hard washer 4A and a lower hard washer 4B are provided below the upper hard ring 5A and above the lower hard ring 5B, respectively, as required. 32, and the cam portion 810 is fixed to the upper rigid ring 5
A or pressure is applied to the upper hard washer 4A. When the height of the chair is adjusted by the assembled structure, when the driving rod 8 is moved downward, the cam portion 810 does not apply a force to the upper hard ring 5A or the upper hard washer 4A, and the The ring 6 is naturally loosened, and if the chair is not pressed at this time, the support shaft 7 is pushed upward by the elastic force of the spring member 9. When a downward force is applied to the driving rod 8 to press the chair, the chair is lowered by the support shaft 7 and the compressed spring member 9, and the elasticity of the spring member 9 is stored. Thus, the height of the chair is adjusted. When fixing the chair and the support shaft 7 at an appropriate position, the handle 80 of the drive rod 8 is moved upward. At this time,
The cam portion 810 presses the upper hard ring 5A or the upper hard washer 4A downward, and the upper hard ring 5A or the upper hard washer 4A compresses the soft ring 6 together with the lower hard ring 5B. Thereby, the central hole 6 of the soft ring 6
0 contracts inward of the diameter, and pinches and stops the outer periphery of the support shaft 7 (see FIG. 4), thereby fixing the support shaft 7, and the chair becomes a chair of a desired height. This kind of simple structure simplifies the overall control structure, reduces the failure rate,
In addition, it is very economical to realize a reduction in production cost.

[0008]

The chair lifting and lowering control device of the present invention has a simple structure that does not require a special power unit, and has an effect of reducing the failure rate and the production cost. Further, the chair elevation control device of the present invention has an effect of controlling the elevation of the chair height without using air pressure power. Further, the chair lifting / lowering control device of the present invention, when the soft ring on the support shaft is compressed by the drive rod to fix the support shaft and the handle is loosened, the soft ring is no longer in a state where the support shaft is sandwiched and fixed. This has the effect that the elevation of the support shaft can be adjusted.

[Brief description of the drawings]

FIG. 1 is a schematic view of a chair to which a chair lifting control device of the present invention is attached.

FIG. 2 is a three-dimensional exploded view of the chair elevating control device of the present invention.

FIG. 3 is a sectional view showing a state after assembling of the present invention but before lifting up the adjusting body and before tightening the flexible ring.

FIG. 4 is a sectional elevation view of a chair lifting / lowering control device similar to that of FIG. 3, in which an adjusting body is lifted up and a soft ring is fastened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Barrel 11 Screw part 12 Inner flange 100 Seat bracket 101 Seat 2 Support base 21 Socket 22 Deployment leg part 23 Caster 3 Grasping bracket 30 Cut 31 Inner screw part 32 Shaft hole 33 Shaft member 331 Large diameter part 332 Medium diameter part 333 Screw part 34 Nut 35 Washer 36 Screw 37 Screw hole 4A Upper hard washer 4B Lower hard washer 40, 50, 60 Central hole 5A Upper hard ring 5B Lower hard ring 6 Soft ring 7 Support shaft 70 Extension shaft 701 Small diameter portion 702 Projection Part 703 Upper half taper 71 Flange 72 Screw 73 Screw hole 8 Drive rod 80 Handle 81 Fork member 810 Cam part 811 Shaft hole 9 Spring member

Claims (1)

[Claims] 1. A chair, which is provided between a seat bracket and a support base to adjust the height of a chair.
Including a support shaft, a lower rigid ring, a soft ring, an upper rigid ring, a grip bracket, and a drive rod, the barrel has an inwardly directed inner flange at an appropriate height on its inner side surface, and the barrel lower end has The support member is inserted into the socket of the support base, the spring member is attached to the inside bottom of the barrel, the support shaft has its flange located at the upper end of the spring member in the barrel, the upper end of the support shaft is inserted under the seat bracket, and the lower rigid The ring body is provided with a central hole through the support shaft at the center thereof, and placed at a position above the internal flange inside the barrel,
The soft ring is provided with a central hole at its center, the inner diameter of which is substantially opposite to the outer diameter of the support shaft, and overlaps the upper surface of the lower hard ring,
The upper hard ring has a central hole at the center thereof for passing the support shaft, and fits into the support shaft in the barrel so as to overlap the upper surface of the soft ring, and the grip bracket is firmly attached to the upper end of the barrel. Fixed to prevent the upper rigid ring from detaching from the barrel, the drive rod includes a handle and a fork member having a cam portion at the tip, and the cam portion is connected to the shaft holes on both sides of the grip bracket. Then, when the handle is moved upward, the cam portion presses the upper hard ring downward, and the upper hard ring and the soft ring located between the lower hard rings are also compressed on both upper and lower surfaces, and the Radial shrinkage acts on the center hole surface at the center, compressing the outer periphery of the support shaft, fixing the support shaft at the set position, and moving the handle in the opposite direction, the soft ring becomes the original The center hole at the center of the Axis is movable in the axial direction, the chair lift control device, characterized in that the height of the chair is arbitrarily adjustable.