KR100383825B1 - Column unit for chair - Google Patents

Abstract

The present invention relates to a column unit for a chair, and in particular, a guide sleeve for guiding and supporting the movement of the spindle between the base tube and the spindle is provided, and a tension spring is installed between the lower end of the guide sleeve and the upper end of the base tube. The present invention relates to a chair column unit capable of securing reliability of vertical movement of a sleeve.

The present invention for achieving the above object is a base tube for forming a gas cylinder structure, a piston rod fixed to the lower end of the piston rod to the base tube, a piston coupled to the upper end of the piston rod, the piston is fitted A chair column unit comprising a spindle filled with a pressure gas filled therein, and a guide sleeve installed between the spindle and the base tube to move up and down with the spindle, wherein the upper portion of the base tube and the guide sleeve Elastic means is provided between the lower portions of the guide sleeve to provide a force to pull the lower portion of the guide sleeve to the upper portion of the base tube, thereby ensuring the reliability that the guide sleeve moves up and down with the spindle reliably. to provide.

Description

Column unit for chair

TECHNICAL FIELD The present invention relates to a column unit for a chair, and in particular, a guide sleeve for guiding and supporting a movement of a spindle between a base tube and a spindle so as to maintain a guiding function at the position of the maximum stroke, and having a lower end of the guide sleeve. Telescopic column unit for the chair that can be secured with respect to the vertical movement of the guide sleeve by installing a tension spring between the and the upper end of the base tube.

In general, a well-known column unit applied to a chair has a structure in which a gas cylinder is installed inside a base tube. That is, the piston rod of the gas cylinder is rotatably installed on the support plate sealing the lower part of the base tube by a ball bearing, and the piston installed at the upper end of the piston rod is located inside the spindle of the gas cylinder. The spindle interior is filled with pressure gas to act as a gas cylinder. Here, the inside of the spindle is configured so that even if the spindle moves up and down along the piston rod, the pressure gas therein does not flow out, the spindle is separated into two upper and lower chambers by the piston and each hole This is formed and connected by a bypass channel, and a hole formed in the upper chamber is provided with a control valve and a control pin for controlling its opening and closing. The seat of the chair is placed on the upper part of the spindle, and the base of the wheel (chair base) is usually installed on the lower part of the base tube.

A general chair column unit configured as described above is composed of a base tube and a gas cylinder, and the spindle of the gas cylinder is moved up and down to adjust the height of the chair seat. In other words, when the user presses the control pin to open the control valve while the spindle is at the lowest position, the upper and lower chambers of the spindle are connected through two holes and a bypass channel so that the pressure gas inside the spindle pushes the piston toward the lower side of the spindle. The spindle then rises along the piston rod. On the contrary, if a force exceeding the pressure gas pressure is applied from the top of the spindle while pressing the control pin, the spindle moves downward. The user may not only adjust the height of the chair seat by appropriately adjusting such an operation, but also feel the cushion when the user sits on the chair seat by the gas cylinder effect.

Here, if the length of the piston rod is increased in order to increase the stroke of the spindle, there is a problem that the operation becomes unstable during the operation of the gas cylinder.

A chair column unit for solving this problem is described in US Pat. No. 5,377,942, which shows the installation of a guiding sleeve between the base tube and the spindle.

The patent installs a support ring that moves up and down with the spindle at the lower end of the spindle, and the guide sleeve is formed therein with an annular groove formed therefrom from below to a certain height so that the support ring is lifted together as the spindle is raised to form an annular groove. If caught on the upper end of the guide sleeve from then it will rise with the spindle. When the spindle is lowered downward, the upper end of the guide sleeve is caught by another support ring installed on the spindle and lowered together with the spindle.

On the other hand, the patent shows another embodiment, another embodiment is to use the pulley and the pulley device to move the guide sleeve up and down with the spindle.

Conventional chair column unit is moved up and down the friction force between the outer surface of the spindle and the inner side of the guide sleeve when the spindle is reciprocated or the frictional force is not exerted enough to eventually move even if the guide sleeve does not move When descending to two support rings installed at a predetermined position, when the upper end of the guide sleeve is raised, the upper end of the annular groove formed therein is caught and moved up and down.

However, the conventional column unit for a chair may be applied from the outside during the movement because the guide sleeve is moved in a state in which the spindle is moved a lot when the friction force between the outer surface of the spindle and the inner side of the guide sleeve is not sufficient. There is a problem that is difficult to cope with the moment.

In addition, in the conventional column unit for a chair as described above, if the friction force is not enough, the guide ring is moved only after the support ring is engaged to a certain position of the guide sleeve, so that the user can adjust the height only to that position. Since the sleeve is not raised, the guide sleeve may not function properly and there is a problem that noise may occur when the support ring is caught.

The present invention has been made to solve the above-mentioned problems of the prior art, by securing the reliability of the vertical movement of the guide sleeve to move with the spindle by connecting a tension spring between the upper end of the base tube and the lower end of the guide sleeve It is an object of the present invention to provide a column unit for a chair that can perform a complete guide function even in a stroke.

1 is a cross-sectional view cut in 120 degrees at the lowest position of the column unit for a chair according to the present invention,

Figure 2 is a cross-sectional view cut in 120 degrees at the top position of the column unit for a chair according to the present invention,

3 is a perspective view of a tube guide which is a component of a column unit for a chair according to the present invention;

4 is a cross-sectional view taken along line AA of FIG. 3;

5 is a perspective view of a pin and a spring installed on the tube guide which is a part of the column unit for a chair according to the present invention;

6 is a perspective view of a ring installed at a lower end of a guide sleeve which is a part of a column unit for a chair according to the present invention;

7 is a cross-sectional view according to another embodiment of the chair column unit according to the present invention.

<Explanation of symbols on main parts of the drawings>

1: base tube 2: tube guide

3: spindle 4: gas open pin

5: piston rod 10: guide sleeve

11: pipe 12: upper plastic guide

13: lower plastic guide 14: washer

20: pin 30: ring

40: tension spring

The column unit for a chair according to the present invention includes a base tube for forming a gas cylinder structure, a piston rod having a lower end of a piston rod fixed to the base tube, a piston coupled to an upper end of the piston rod, and the piston being fitted A chair column unit comprising a spindle filled with a pressure gas therein and a guide sleeve installed between the spindle and the base tube and vertically moved together with the spindle, wherein the guide is disposed between the base tube and the guide sleeve. It is characterized in that the elastic means for providing a force for pulling the sleeve to the upper side of the base tube.

In addition, the column unit for a chair according to the present invention is characterized in that the elastic means is a plurality of tension springs provided between the base upper portion and the guide sleeve lower portion.

In addition, the column unit for a chair according to the present invention is characterized in that the three tension springs are installed, installed every 120 degrees.

In addition, in the column unit for a chair according to the present invention, a tube guide is fitted to an upper end of the base tube to a predetermined height, and a plurality of grooves are formed at an outer circumference of the tube guide, and pins are inserted into the grooves, respectively. The ring is installed at the lower end of the sleeve, characterized in that the upper and lower ends of the tension spring is fitted to the pin and the ring is fixed.

In addition, the chair column unit according to the present invention is formed with a flange protruding outward from the upper end of the tube guide is caught by the upper end of the base tube, the T-shaped groove is formed at a lower angle of the flange 120 degrees and the groove The pin is inserted into the horizontal portion of the, characterized in that the upper end of the tension spring is fitted into the hole formed in the pin.

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

The column unit for a chair according to the present invention is a base tube (1) is connected to the bottom of the base of the chair is typically installed wheels, as shown in Figures 1 to 6, the inner bottom of the base tube (1) A piston rod 5 having a piston (not shown) mounted on the upper end and a spindle 3 having the piston installed thereon, and between the base tube 1 and the spindle 3 together with the spindle 3 can be moved up and down. And a tension spring 40 which is connected between the guide sleeve 10 and the lower end of the guide sleeve 10 and the upper end of the base tube 1 to provide a force for pulling the guide sleeve 10 upward. It is composed.

1, 3, and 4, a tube guide 2 is inserted into the base tube 1, and the tube guide 2 has a flange 2a formed at an upper end thereof so that the flange 2a is formed. It is caught by the upper end of the base tube 1, and three T-shaped grooves 2b are formed in the lower part at 120 degree intervals. A pin 20 is caught in the horizontal groove 2c of the T-shaped groove 2b, and holes are formed in the pin 20 at intervals of 120 degrees so that an upper end portion of the tension spring 40 is coupled. The tension spring 40 is seated in the vertical groove 2d of the female groove 2b.

As shown in FIGS. 1 and 2, the guide sleeve 10 includes a pipe 11 directly contacting the inner side of the tube guide 2, and a flange 12a fitted to an inner side of the pipe 11. ) Is formed and consists of an upper plastic guide (12) contacting the spindle (3) inside, and a lower plastic guide (13) formed at a lower end thereof with a flange (13a) fitted from the lower end of the pipe (11). The ring 30 is provided at the lower end of the tension spring 40 at a lower portion of the flange 13a of the lower plastic guide 13. A washer 14 is provided between the upper end surface of the pipe 11 and the lower surface of the flange 12a of the upper plastic guide 12.

1 and 2, the spindle 3 has a piston rod 5 having a fixed length having a lower end fixed to a lower end of the inner side of the base tube 1, as shown in FIGS. The piston is inserted into the upper end of the piston rod 5 inserted therein to divide the inside of the spindle 3 into the upper and lower chambers, and the upper end for adjusting the opening and closing of the bypass channel formed on one side of the spindle 3. The gas open pin 4 is provided. In addition, a stopper 3a is provided at a predetermined height of the spindle 3 that is caught by the upper end of the flange 12a of the upper plastic guide 12.

The shape of the tube guide 2 is well illustrated in FIGS. 3 and 4, wherein an upper end of the tube guide 2 is formed with a flange 2a, and a T-shaped groove below a certain distance from the flange 2a. A horizontal groove 2c of 2b is formed, and a vertical groove 2d of the T-shaped groove 2b is connected to the middle of the horizontal groove 2c. Of course, as described above, three T-shaped grooves 2b are formed at the outer side of the tube guide 2 at an angle of 120 degrees. As shown in FIG. 5, a pin 20 is fitted into the horizontal groove 2c of the three T-shaped grooves 2b, and a hole is formed in the pin 20. The upper end of the tension spring 40 is fitted and fixed, and the tension spring 40 is seated along the vertical groove 2d of the T-shaped groove 2b, and as shown in FIGS. 1 and 2, the tension spring ( The lower end portion of the 40 is fitted with a hole 30a formed every 120 degrees in the ring 30 shown in FIG. 6 installed below the lower plastic guide 13 to install a tension spring 40. Accordingly, the upper end portion of the tension spring 40 is fixed to the pin 20 fitted into the T-shaped groove 2b, and the lower end portion is fixed to the ring 30 fixed to the lower portion of the lower plastic guide 13. Provide a force to move the sleeve 10 upwards.

The operation of the column unit for a chair according to the present invention configured as described above will be described with reference to the accompanying drawings.

1 shows a state where the guide sleeve 10 is located at the lowermost part, in which the piston inside the spindle 3 is located at the top of the spindle 3, and the gas open pin 4 is connected to the bypass channel. In the state of being closed, since the guide sleeve 10 is located in the lowermost part, the tension spring 40 is in the state in which the length extends to the maximum. In addition, the guide sleeve 10 is in a state in which the upper end of the flange 12a of the upper plastic guide 12 is not caught in the upper side because it is caught in the stopper 3a.

In the state as shown in FIG. 1, when the user presses the gas open pin 4, the lower chamber and the upper chamber of the spindle 3 communicate with each other through a bypass channel, so that the piston is connected to the inside of the spindle 3. The pressure is pushed downward by the pressure gas and the lower end of the piston rod 5 is fixed to the base tube 1, so that the spindle 3 starts to move upwards. At this time, the guide sleeve 10 is a state in which the upper surface of the flange 12a of the upper plastic guide 12 is in contact with the stopper 3a together with the spindle 3 by the elastic force of the tension spring 40. Start to move upwards.

In this way, if the user removes the force pressing the gas open pin 4 while the spindle 3 and the guide sleeve 10 move upwards, the spindle 3 is closed because the bypass channel is closed. It can no longer move upwards, and thus the guide sleeve 10 also stops when the upper surface of the upper plastic guide 12 is caught by the stopper 3a.

If the user keeps pressing the gas open pin 4, the spindle 3 continues to move upwards and is positioned at the top, and the guide sleeve 10 is also positioned at the top, but the height is increased. Limited. That is, the flange 13a of the lower plastic guide 13 is raised only to a height that is caught by the lower end of the tube guide 2. Of course, in this case, the tension spring 40 provides the elastic force to the guide sleeve 10 and its length is reduced to a minimum, and the flange 12a of the upper plastic guide 12 is connected to the stopper 3a. Are spaced apart.

When the user wants to lower the height of the spindle 3, the force that can overcome the force in the upward direction generated by the pressure gas inside the spindle 3 while pressing the gas open pin 4 is applied. When applied from the upper side to the lower side, the spindle 3 is lowered. When the spindle 3 is lowered to reach a position where the flange 12a of the upper plastic guide 12 comes into contact with the stopper 3a, the guide sleeve 10 is lowered together with the spindle 3. In this case, the force to be applied on the upper side of the spindle 3 should be applied to overcome the elastic force by the tension spring 40 as well as the force by the pressure gas inside the spindle 3. Continued application of this force above the spindle 3 causes the spindle 3 and the guide sleeve 10 to descend together. Of course, if the force used to press the gas open pin 4 is removed, the spindle 3 and the guide sleeve 10 are stopped at the position, and the height is fixed. Continued application of force results in the state of FIG. 1 and the spindle 3 no longer lowers.

On the other hand, Figure 7 is a cross-sectional view showing another embodiment of a column unit for a chair according to the present invention, the tilt of the chair seat in place of the stopper (3a).

As described above, in the chair column unit according to the present invention, a tension spring 40 is installed between the upper end of the base tube 1 and the lower end of the guide sleeve 10 so that the spindle 3 moves up and down. The guide sleeve 10 reliably provides the effect of ensuring the reliability to move up and down with the spindle (3).

The present invention is not limited to the above embodiments and may be variously modified and implemented by those skilled in the art without departing from the technical gist of the present invention.

Claims (5)

A base tube for forming a gas cylinder structure, a piston rod having a lower end of a piston rod fixed to the base tube, a piston coupled to an upper end of the piston rod, a spindle into which the piston is fitted, and a pressure gas filled therein; In the column unit for a chair comprising a guide sleeve which is installed between the spindle and the base tube and moved up and down with the spindle, A tube guide fitted to a predetermined depth from an upper portion of the base tube, a guide sleeve sandwiched between the tube guide and the spindle so as to be movable upward and downward, and the guide sleeve between the tube guide and the guide sleeve above the base tube. Chair unit, characterized in that the elastic means fixed to both ends is installed to provide a force to pull. The method of claim 1, The elastic means is a chair column unit, characterized in that the plurality of tension springs provided between the base upper portion and the guide sleeve lower portion. The method of claim 2, Three tension springs are installed, the chair column unit, characterized in that installed every 120 degrees. The method of claim 2, A plurality of grooves are formed in the outer circumference of the tube guide, and the pins are inserted into the grooves, respectively, and a ring is installed at the lower end of the guide sleeve, and the upper and lower ends of the tension spring are fitted into the pins and the ring. Chair column unit. The method of claim 4, wherein The tube guide has a flange with an upper end protruding outward and is caught by the upper end of the base tube. A T-shaped groove is formed at a lower angle of the flange at a 120 degree angle, and a pin is fitted into a horizontal portion of the groove. Chair column unit characterized in that the upper end of the tension spring is fitted in the hole formed in the.