KR102473449B1 - Height adjusting device for chair - Google Patents

Abstract

It is an object of the present invention to provide a height adjusting device for a chair that guarantees the life of the gas cylinder even in long-term use by maximally reducing eccentric wear caused by repetitive pressing of the gas opening/closing pin of the gas cylinder.
The above object of the present invention is to combine the piston rod of the gas cylinder with a cylinder coupling hole and tow a wire that is rotated at a certain angle around the central axis hole by the pulling operation of the wire by pulling the height adjustment lever in the damper block assembled to the cushion plate of the seat portion. The rotating plate and the rotating spiral shaft, the lower end of which is seated in the rotating shaft groove of the damper block, rotates synchronously with the central shaft hole of the traction rotating plate and the upper part of the rod by shaft assembly, and the shaft coupled with the rod of the rotating spiral shaft and formed on the lower side A lifting support ring geared with a lifting spiral projection formed opposite to the spiral support projection, and a shaft pin that is shaft-coupled to the horizontal shaft hole in a state where the front end presser contacting the gas opening/closing pin of the piston rod is accommodated in the receiving groove of the damper block At the same time as the shaft assembly with the central shaft hole, the rotation pressing plate inserted into the lifting guide hole in the anti-rotation protrusion formed on the upper part of the lifting support ring, and the boss receiving screw groove formed opposite to the screw boss protruding on both sides of the upper part of the damper block are seated It can be achieved by a chair height adjusting device composed of a support plate that is assembled and rotates to support the lower part of the traction rotary plate.

Description

Chair height adjusting device {Height adjusting device for chair}

The present invention relates to a chair height adjusting device capable of stably adjusting a seat according to a user's seating height by finely controlling the opening and closing of a gas cylinder that moves a piston rod up and down according to a pulling operation of a wire.

A general chair has a backrest portion and a seat portion where the user's back and buttocks can come into contact, respectively, and an office chair for long-time work is used with a desk for work or study at a company or home.

Therefore, since the seat of a chair plays a role of supporting the user's hips for a long time, it is important to provide stable support for the backrest and seat for prolonged sitting. have.

The chair height adjusting device is used by adjusting the seating height of the seat supported by the gas cylinder, which is the central axis of the leg, by controlling the elevation of the piston rod.

The scope of the present invention belongs to the category of elevation control of a piston rod of a gas cylinder built into a chair.

Examples of prior art in this field include Patent Documents 1 to 7.

What all of these source technologies have in common is how they provide control of the gas cylinder.

Patent Document 1 is a cable (covering member, wire, etc.) of a predetermined length between a first member (taper holder, taper arm) and a second member (button, case, load arm), etc., which are configured to push the opening/closing pin. ), and the cable is buried in the armrest of the chair so that the opening/closing pin can be pushed by the action of the cable when the button is pressed, and the button can be installed 'Height adjustment member for chair' ' was initiated.

Patent Document 2 forms a support step inside the lower end of the connection hole of the seat plate lower cover so that the locking step formed on the operating lever is supported, and forms a wide contact portion with reinforcing force on the upper surface of the operating lever to contact the front end of the cylinder operation An 'actuating lever installation structure for adjusting the height of a chair' is disclosed so that the actuating lever can be smoothly operated even if the position is not set in the right position.

Patent Document 3 forms a passage communicating in the longitudinal direction inside the armrest of the chair, and installs an arm whose one end is hinged inside the mounting plate coupling the bottom surface of the seat cushion and the upper end of the pneumatic cylinder to the valve button. 'Chair height adjustment device' connected to the end of the wire by connecting a wire to the other end of the hinge and extending it to the front end of the armrest through the passage, and installing a lever fixed with a pin on the passage of the front end of the armrest. has been initiated

Patent Document 4 is a chair in which a control case having a built-in control mechanism for adjusting the chair is coupled to the lower side of the seat plate, and the control case is coupled with a central axis inserted into a post constituting a chair leg so as to be able to move vertically and rotate. A control block hinged to the control case to operate the axis, an actuating lever hinged to the lower side of the seat plate, and both ends thereof are fixed to the control block and the actuating lever, respectively, and are pulled according to the operation of the actuating lever to operate the control block A 'chair height adjusting device' composed of a wire cable having a wire has been disclosed.

Patent Document 5 discloses a spindle reciprocating up and down according to height adjustment, a cylinder mounted inside the spindle and filled with gas therein, a piston member dividing the inside of the cylinder up and down, and sealing the upper end of the cylinder, A valve member for controlling the entry and exit of the gas filled in the cylinder, a pressing member for controlling the opening and closing of the valve member, a cable for controlling the rotation of the pressing member by being pulled by an external force, and the release inside the cylinder. A 'gas cylinder operated by a cable' is disclosed, in which an arm is accommodated and a taper holder rotatably intervened in the spindle, and as the cable rotates, the pressing member and the taper holder are configured to rotate together. .

Patent Document 6 is a gas cylinder installed on the lower seat base to move the seat up and down, a gas cylinder control unit installed on the seat above the gas cylinder, a user lever installed in the outer region of the seat plate, and both ends coupled to the gas cylinder and user lever. Including a cable, the gas cylinder control unit includes a body having a through hole, a stopper formed on the body on one side of the through hole, a coupling hole formed on the lower surface of the body in contact with the through hole in a direction perpendicular to the direction of the through hole, and a through hole A control lever inserted into and having a tapered lower surface, a coupling rod formed opposite to the lower area of the control lever and coupled to the coupling hole, a first insertion hole formed at the end of the upper part of the control lever and into which the cable is inserted, and a stopper It is formed in the upper region of the body on the other side opposite to one side of the formed through hole and has a second insertion hole into which the cable is inserted, and a 'chair height adjustment' equipped with a spring installed in the cable between the first insertion hole and the second insertion hole. Device' has been started.

Patent Document 7 is a prior registration technology of the present applicant, and the rod of the shock absorber is rotated by pulling and rotating the control lever shaft assembled with the support shaft and the shaft pin formed on one side of the lower edge of the cushion plate connected with the rotation lever and the wire. A 'slide structure for the left side of a chair' configured to rotate around an axis pin and release the actuation control of the rod by pressing the intermittence button provided at the end of the rod of the shock absorber, so that the rod is lifted or lowered by the load. has been initiated

1. Korean Patent Publication No. 2000-0007287 (published on Feb. 7, 2000) 2. Korea Registered Utility No. 20-0258172 (registered on Dec. 7, 2001) 3. Korea Registered Utility No. 20-0306817 (registered on February 26, 2003) 4. Korea Registered Utility No. 20-0315980 (registered on May 29, 2003) 5. Korean Patent Publication No. 2008-0000485 (published on 2008.01.02) 6. Korean Patent Registration No. 10-1723604 (registered on March 30, 2017) 7. Korean Registered Patent No. 10-2028263 (registered on June 26, 2019)

The above Patent Documents 1 and 5 are the same applicant, and the taper arm (release arm) of the opening/closing pin is built by connecting to a wire that operates by pulling in a state built inside the spindle, thereby constructing a cylindrical outer cylinder (gas cylinder) This complexity, in particular, the compatibility of the gas cylinder is not guaranteed, resulting in an increase in manufacturing cost.

Patent Document 2 provides height adjustment by opening the gas cylinder during cylinder operation by pressing the operating lever installed on one side of the seat plate, but the inconvenience of the user checking and pressing the operating lever installed under the seat plate and operating the operating lever The downside is that it takes a lot of effort to press.

Patent Document 3 tries to prevent exposure to the outside in constructing a height adjusting device for a chair, but when the operation of the pneumatic cylinder is locked (fixed in height), the upward pulling operation of the lever requires a lot of effort, as in Patent Document 2. There were downsides.

Patent Document 4 has the disadvantage of low productivity due to the complexity of the structure of the control case constituting the height control unit and the time consuming assembly work between the seat plate and the leg of the chair.

In Patent Document 6, when the lever hinged to the seat base of the chair is pulled, the cable wire is pulled and the lower surface of the control lever coupled to the body is opened by pressing the upper push button (opening and closing pin) of the gas cylinder, but the control lever When it rotates around the coupling bar shaft-assembled in the coupling groove of the body, the push button presses on one side and rotates to operate. When used for a long period of time, the eccentric wear of the push button due to the eccentric pressing operation and the deformation due to the side pressure cause gas gas There are disadvantages such as shortening the lifespan of the cylinder and moving the seat up and down due to the rapid operation of the gas cylinder simply by the operation of the push button.

Patent Document 7 operates by pressing the control button of the gas cylinder (shock absorber) by rotating the pivot lever upward with the elastic force of the spring by the pulling of the wire downward around the axis pin, but the rotation of the pivot lever by direct pulling of the wire As a result, there was an inconvenient disadvantage due to the sudden lifting operation of the shock absorber (gas cylinder) by the operation of the control button.

The present invention was developed to solve the above disadvantages of the prior art and the applicant's sailor technology, and an object of the present invention is to operate the gas cylinder by angular rotation (pulling rotation) of the height adjustment lever provided on one side of the seat portion. The gas opening/closing pin of the gas cylinder is provided as a fine pressing step, so it is provided smoothly and smoothly without rapid elevation according to the height adjustment of the seat plate. It is to provide a chair height adjusting device that guarantees the life of the gas cylinder even for long-term use by minimizing eccentric wear due to repetitive pressing of the gas opening/closing pin by eliminating eccentric contact as much as possible.

The chair height adjusting device of the present invention for achieving the above object,
A traction rotary plate that combines the piston rod of the gas cylinder with a cylinder coupling hole and rotates at a certain angle around the central axis hole by the traction operation of the wire by pulling the height control lever in the damper block assembled to the cushion plate of the seat portion;
A rotating spiral shaft whose lower end is seated in the rotating shaft groove of the damper block and rotates synchronously with the central shaft hole of the traction rotating plate and the upper rod by shaft assembly;
a lifting support ring axially coupled to the rod of the rotating spiral shaft and gear-coupled with a rotating spiral supporting protrusion formed on the lower side and a lifting spiral protrusion formed opposite to the rotating spiral shaft;
In the state where the front end pressing part in contact with the gas opening/closing pin of the piston rod is stored in the receiving groove of the damper block, the shaft pin and the central shaft hole are axially coupled to the horizontal shaft hole. An anti-rotation protrusion formed on the upper part of the lifting support ring at the same time as the shaft assembly a rotary pressing plate inserted into the lifting guide hole penetrating the lifting guide part; and,
a support plate seated and assembled with boss receiving screw grooves formed opposite to the screw bosses protruding on both sides of the upper portion of the damper block and rotationally supporting the lower portion of the traction rotation plate; including,
By the rotation of the traction rotating plate, the lifting spiral projection of the lifting support ring is forcibly spiraled up along the rotating spiral supporting projection of the rotating spiral shaft, and at the same time, while the rotating pressing plate pivots with the shaft pin, the front end pressing portion of the gas opening/closing pin It is characterized in that it is configured to operate the piston rod upward by pressing.

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Here, the rotating spiral support protrusion of the rotating spiral shaft and the lifting spiral projection of the lifting support ring are spirals opposed to each other and are a ratchet gear type spiral coupling capable of one-side spiral rotation, and the lifting operation and reverse rotation of the lifting support ring by one-way rotation. It is characterized in that the lowering operation is provided by the return rotation of .

The traction rotating plate is assembled with a concave-convex groove formed at a certain distance in the longitudinal direction of the outer circumferential surface on the upper part of the rod in the central shaft hole in which an annular concave-convex groove is formed on the inner circumferential surface of the rotating spiral shaft, which is assembled by slide fitting to provide mutual synchronous rotation. to be.
The lifting guide hole penetrated through the lifting guide part is assembled with the traction rotating plate by inserting the rod of the rotating spiral shaft into the shaft hole in a state in which the shaft hole and the protruding hole on both sides of the shaft hole are through-molded, and the rotation of the lifting support ring is prevented. The projection is assembled with the projection hole, and the lifting support ring assembled through the shaft hole in the rod by the rotation of the rotation spiral shaft by the forced rotation of the traction rotating plate is the lifting spiral projection along the spiral surface of the rotation spiral support projection. The lifting guide part rises, and the forced rotation of the traction rotating plate is released, and the tip pressing part rises by the elastic force of the compression spring interposed between the bending extension end extended from the front end pressing part of the rotary pressing plate and the damper block. At the same time as restoration, the lifting spiral projection of the lifting support ring is lowered along the spiral surface of the rotating spiral support projection by the descending of the lifting guide unit and the reverse rotation of the rotating screw shaft, thereby restoring and rotating the traction rotating plate to its original state. .

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In addition, in the present invention, the traction rotating plate has a fan-shaped wire fitting groove formed on one side, and the support plate has a stopper protrusion for stopping the maximum rotation of the traction rotating plate and a wire guide protrusion for guiding the traction of the wire. It is characterized by being molded in.

According to the present invention, the height of the seat portion of the chair can be finely adjusted to open and close the gas cylinder pin according to the degree of pulling of the wire, thereby eliminating rapid rise and fall, thereby enabling stable use.

In addition, according to the present invention, the opening and closing operation of the gas cylinder, which guarantees the lifespan of the height adjustment of the chair by mechanically linked operation even during long-term use, is accurate, and the lifespan of the chair is extended by guaranteeing the lifespan of the gas cylinder by eccentric wear by opening and closing in the axial direction. There is a guaranteed benefit.

1 is a bottom perspective view of a chair equipped with a height adjusting device according to the present invention.
2 is an exploded perspective view of a backrest, a seat, and a leg of a chair equipped with a height adjusting device according to the present invention.
3 is an exploded perspective view of the constituent member of the present invention.
Figure 4 is a perspective view of the assembled state of the constituent members of the present invention.
Figure 5 is an assembly state diagram according to the present invention, a plan view before the pulling operation of the control lever.
FIG. 6 is a cross-sectional perspective view seen in the direction of line IV-IV in FIG. 4 .
7 is a plan view after the pulling operation of the control lever according to the present invention.
Figure 8 is an excerpted perspective view from the front direction according to Figure 7;
Figure 9 is an excerpted perspective view from the side direction according to Figure 7;
10 and 11 are exploded perspective views for explaining the linked operation of the constituent members according to the operation of the present invention,
10 is an exploded perspective view before and after the operation of the rotary pressing plate and the lifting guide shaft before the rotation of the traction rotary plate;
11 is an exploded perspective view after operation of the rotation pressing plate and the lifting guide shaft after rotation of the traction rotary plate.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, the structure and size of the components presented in the drawings may be simplified or simplified unless it is a problem in the description of the invention.

1 is a bottom perspective view of a chair equipped with a height adjusting device according to the present invention, and FIG. 2 is an exploded perspective view of a backrest, seat, and legs of a chair equipped with a height adjusting device according to the present invention.

Referring to these drawings, the chair to which the present invention is applied has a seat portion 10 supporting the user's buttocks seating, a back portion 20 supporting the user's back on the seat portion, and the seat portion 10 at regular intervals from the ground. The components of the leg part 30 supported in a spaced apart state are included.

In the seat portion 10, the seat plate 12 is assembled to the cushion plate 11, and armrests 13 supporting the user's arms are installed on both sides of the seat plate 12.

In the present invention, the damper block 50 assembled with the piston rod 41 of the gas cylinder 40 vertically assembled at the center of the leg portion 30 has a block groove formed at the lower center of the cushion plate 11 ( 14), the seat plate part 10 is assembled so that the seat plate part 10 is tilted back at a certain angle by being shaft-coupled with the shaft pin P in the stored state, and the height adjustment lever 60 assembled to be able to pivot at the lower part of one side of the cushion plate 11 The height of the seat portion 10 is controlled by the operation of the gas opening/closing pin 42 provided on the piston rod 41 of the gas cylinder 40 by pulling the wire W connected to one side of the gas cylinder 40 to control the upward or downward operation. Adjustment is performed, and since the principle and configuration of height adjustment of the chair are described in detail in Patent Document 7, which is a prior registered patent of the present applicant, the description of the present invention will be sufficiently understood even if the detailed description is omitted.

Figure 3 is an exploded perspective view of the constituent members of the present invention, Figure 4 is a perspective view of the assembled state of the constituent members of the present invention, Figure 5 is an assembled state diagram according to the present invention, a plan view before the pulling operation of the control lever, Figure 6 is It is a cross-sectional perspective view seen in the direction of line IV-IV in FIG. 4 .

Referring to these drawings, the present invention includes a traction rotary plate 100, a rotary spiral shaft 200, a lifting support ring 300, a rotary press plate 400, and a support plate 500 built in a damper block 50, , The height adjustment lever 60 rotatably assembled on the lower part of one side of the cushion plate 11 and the traction rotation plate 100 are connected by a wire (W).

The wire (W) is molded in the cushion plate 11 and extends through a wire groove 15 connected to the block groove 14 to be connected to the traction rotating plate 110, and the wire W reduces frictional noise due to pulling. It is housed in the wire groove in a state of being wrapped with a protective tube (W/T) on the outside so as not to

The traction rotary plate 100 has a fan-shaped inner circumferential surface through which a central shaft hole 110 formed by forming annular concave-convex grooves 120 of irregularities at regular intervals in the axial direction penetrates, and a wire insertion fixing groove 130 is formed on one side thereof. One end of the wire (W) is connected.

Therefore, the piston rod 41 of the gas cylinder 40 is coupled to the cylinder coupling hole 52 and the wire (W) by pulling the height adjustment lever 60 in the damper block 50 assembled to the cushion plate 11 It is forcibly rotated around the central shaft hole 110 by the traction operation of.

The lower end of the rotating spiral shaft 200 is seated in the rotating shaft groove 51 of the damper block 50, and the central shaft hole 110 of the traction rotating plate 100 and the upper portion of the rod 210 rotate synchronously by shaft assembly. .

At this time, the concave-convex groove 220 formed at a certain distance in the longitudinal direction of the upper outer circumferential surface of the rod 210 is formed, and the annular concave-convex groove 120 formed on the inner circumferential surface of the central shaft hole 110 of the traction rotating plate 100 and the slide It is combined with a fitting so that it can be assembled separately and rotated synchronously with each other, and a rotating spiral support protrusion 230 is formed on the outer circumferential surface of the lower part.

The lifting support ring 300 is shaft-coupled with the rod 210 of the rotating spiral shaft 200 and the shaft hole 310, and is molded to face the rotating spiral supporting projection 230 to engage the lifting spiral projection 330 and its upper part. A pair of anti-rotation protrusions 320 are protruded in the axial direction.

At this time, the rotating spiral support projection 230 of the rotating spiral shaft 200 and the lifting spiral projection 330 of the lifting support ring 300 are spirals opposed to each other and rotate in one direction with a ratchet gear type spiral coupling capable of one-sided spiral rotation. As a result, the lifting operation and reverse rotation (return rotation) of the lifting support ring 300 provide a lowering operation.

Due to the spiral rotation between the lifting support rings 300 according to the rotation of the rotating spiral shaft 200, the lifting or lowering moves in close contact with each other, so that the lifting operation is performed smoothly without sudden rising or falling.

The rotary pressing plate 400 has a central shaft hole 410 through-molded in the middle in the horizontal direction, and a lifting guide part formed through-molding a lifting guide hole 431 on the opposite side to the front end pressing part 420 centering on the central shaft hole ( 430) is integrally molded.

This rotary pressing plate 400 is installed according to the seesaw principle of angular rotation around the central shaft hole 410.

That is, the rotary pressure plate 400 is assembled at the lower side of the cylinder coupling hole 52 in the receiving groove 53 connected to the cylinder coupling hole 52 of the damper block 50, and the exposed piston rod of the gas cylinder 40 The front end pressing part 420 is disposed in the receiving groove 53 so as to contact the gas opening and closing pin 42 provided in (41), and the horizontal shaft hole 54 of the damper block 50 Shaft pin (P) It is inserted into the lifting guide hole 431 in the anti-rotation protrusion 320 formed on the upper part of the lifting support ring 300 at the same time as the shaft assembly with the central shaft hole 410.

The lifting guide hole 431 of the rotary pressing plate 400 is a shaft hole 431a into which the rod 210 of the rotating spiral shaft 200 is inserted, and the anti-rotation protrusions of the lifting support ring 300 on both sides of the shaft hole ( 320) is formed as a protruding hole (431b) coupled.

In addition, the rotation pressing plate 400 is installed with a lifting restoring force by the elastic force of the compression spring 422 interposed between the bending extension end 421 extending from the front end pressing part 420 and the damper block 50.

In the base plate 500, an installation space R is formed by molding spacer protrusions 510 in which boss receiving screw grooves 520 are formed on both sides of the lower side, and a center support shaft hole 530 is formed by penetrating the installation space .

The support plate 500 is installed through the upper portion of the rotating spiral shaft 200 by the center support shaft hole 530 and is installed as a shaft support, and the rotation support spiral protrusion 230 and the elevation according to the rotation of the lifting support ring 300 In a state where the spiral projection 330 is seated in the boss receiving screw groove 520 of the spacer projection 510 on the screw boss 55 protruding on both sides of the upper portion of the damper block 50 in the state of being accommodated in the installation space R It is assembled by binding with screws (S).

At this time, the traction rotating plate 100 is formed in the concave-convex groove 220 formed on the outer circumferential surface of the rotating spiral shaft 200 protruding through the central support shaft hole 530, and the annular concave-convex groove 120 formed in the central shaft hole 110 ) By being bound with a screw (S) in a shaft-coupled state, the traction rotation plate 100 is assembled in a state in which the upper surface of the support plate 500 supports its lower surface.

In addition, on the upper surface of the support plate 500, the rotation spiral support protrusion 230 of the rotation spiral shaft 200 and the lifting support ring ( 300) of the lifting spiral projection 330 of the stopper projection 540, which suppresses the separation between the spiral projections, and the wire guide projection 550, which guides the pulling smoothly and smoothly without flow according to the traction of the wire W, is molded do.

The operation of the present invention as described above will be described in detail.

Figure 7 is a plan view after the pulling operation of the control lever according to the present invention, Figure 8 is a perspective view taken from the front direction according to FIG. 7, Figure 9 is a perspective view taken from the side direction according to FIG.

Referring to FIG. 7 , when the height adjustment lever 60 assembled to be rotatable on one lower side of the cushion plate 11 of the seat portion 10 is pulled, the traction rotation plate 100 connected to the other end of the wire W will rotate

As shown in FIGS. 8 and 9, the angular rotation of the traction rotating plate 100 causes the spiral shaft 200 to rotate synchronously, and the spiral protrusion 230 of the spiral shaft 200 rotates upward and downwards. The lifting support ring 300 spirally coupled to 330 is spirally raised.

The elevation guide part 430 of the rotary press plate 400 assembled by the anti-rotation protrusion 320 and the elevation guide hole 431 rises by the elevation of the elevation support ring 300 .

By the elevation of the lifting guide 430, the rotary press plate 400 rotates downward around the central shaft hole 410 shaft-assembled with the shaft pin P coupled to the horizontal shaft hole 54 of the damper block 50. The front end pressing part 420 controls the lifting or lowering operation by the pressing operation of the gas opening/closing pin 42 of the piston rod 41 exposed in the receiving groove 53 of the damper block 50, so that the seat portion 10 height adjustment is provided.

Specifically, further referring to FIGS. 10 and 11, the forced rotation of the traction rotating plate 100 is provided with synchronous rotation of the rotating spiral shaft 200, and accordingly, the anti-rotation protrusion 320 of the lifting support ring 300 rotates. The front end pressing part 420 rotates downward around the central shaft hole 410 by being raised to prevent rotation by the protruding hole 431b of the lifting guide hole 431 penetrating the lifting guide part 430 of the pressing plate 400. ) adjusts the height of the seat portion 10 by pushing the gas opening/closing pin 42 and the piston rod 41 of the gas cylinder 40 rising or falling.

In this state, when the traction of the wire (W) is released, the rotary pressing plate 400 is interposed between the bending extension end 421 of the front pressing part 420 and the damper block 50 by the elastic force of the compression spring 422 As the lift is restored, the lift guide hole 431 of the lift guide part 430 descends along the rod 210 of the rotating spiral shaft 200 . At this time, the lifting spiral projection 330 descends in a state where rotation is prevented by the anti-rotation projection 320 of the lifting support ring 300, and the spiral surface of the rotating spiral support projection 230 of the rotating spiral shaft 200 It descends along and rotates the traction rotation plate 100 to restore it to its original state.

That is, the lifting spiral projection 330 of the lifting support ring 300 is forcibly spiraled up along the rotation spiral support projection 230 of the rotation spiral shaft 200 by the forced rotation of the traction rotating plate 100, and at the same time, While the rotary pressing plate 400 pivots with the shaft pin P, the front end pressing part 420 presses the gas opening/closing pin 42 to lift the piston rod 41,

When the wire W is released, the front end pressing part 420 of the rotary pressing plate 400 lifts and restores with the elastic force of the compression spring 422, and the lifting support ring 300 lifts the spiral projection 330 into a rotating spiral. It operates downward while being guided by the spiral surface of the rotating spiral support protrusion 230 of the shaft 200.

By this operation, the seat portion 10 of the chair is height-adjustable by the user, and the piston rod 41 of the gas cylinder 40 moves up and down in a spiral operation. As the opening operation is provided by finely pressing in the axial direction, a smooth operation is provided without rapid rise or fall of the piston rod 41.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by not only the claims described later, but also those equivalent to the claims.

40: gas cylinder 41: piston rod
42: gas opening and closing pin 50: damper block
51: rotating shaft groove 52: cylinder coupling hole
53: storage groove 54: horizontal shaft hole
55: screw boss 60: height adjustment lever
100: traction rotating plate 110: central shaft hole
120: annular concave-convex groove 130: wire fitting fixing groove
200: spiral axis of rotation 210: rod
220: uneven projection groove 230: rotating spiral support projection
300: lifting support ring 310: shaft hole
320: anti-rotation projection 330: lifting spiral projection
400: rotary press plate 410: central shaft hole
420: tip pressing part 421: bending extension
422: compression spring 430: lifting guide
431: lifting guide hole 431a: shaft hole
431b: protrusion hole 500: support plate
510: interval protrusion 520: boss receiving screw groove
530: central support shaft 540: stopper protrusion
550: wire guide protrusion P: shaft pin
R: installation space S: screw
W: wire W/T: protection tube

Claims (6)

When the piston rod 41 of the gas cylinder 40 is coupled to the cylinder coupling hole 52 and the damper block 50 assembled to the cushion plate 11 of the seat portion 10 pulls the height adjustment lever 60 A traction rotating plate 100 that rotates at a predetermined angle around the central shaft hole 110 by the traction operation of the wire (W) by;
The lower end is seated in the rotary shaft groove 51 of the damper block 50, and the central shaft hole 110 of the traction rotary plate 100 and the upper part of the rod 210 rotate synchronously by shaft assembly 200;
A lifting support ring 300 shaft-coupled with the rod 210 of the rotating spiral shaft 200 and gear-coupled with the rotating spiral support protrusion 230 formed on the lower side and the lifting spiral protrusion 330 formed oppositely;
A shaft pin that is shaft-coupled to the horizontal shaft hole 54 in a state where the tip pressing portion 420 in contact with the gas opening/closing pin 42 of the piston rod 41 is accommodated in the receiving groove 53 of the damper block 50 (P) and the central shaft hole 410) are inserted into the lifting guide hole 431 penetrating the lifting guide part 430 into the anti-rotation protrusion 320 formed on the upper part of the lifting support ring 300 at the same time as the shaft assembly. Installed rotation pressing plate 400; and,
Support plate ( 500); including,
By the rotation of the traction rotating plate 100, the lifting spiral projection 330 of the lifting support ring 300 is forcibly spiraled up along the rotation spiral support projection 230 of the rotation spiral shaft 200, and at the same time, Chair height, characterized in that the rotation pressing plate 400 is configured to axially rotate with the shaft pin (P) and the front end pressing part 420 presses the gas opening/closing pin 42 to operate the piston rod 41 upward regulator.
According to claim 1,
The rotating spiral support projection 230 of the rotating spiral shaft 200 and the lifting spiral projection 330 of the lifting support ring 300 are spirals mutually opposed to each other and rotate in one direction by a ratchet gear type spiral coupling capable of one-side spiral rotation. Chair height adjusting device, characterized in that the lowering operation is provided by the lifting operation of the lifting support ring 300 and the return rotation of the reverse rotation.
According to claim 1,
The traction rotating plate 100 is a central shaft hole 110 in which an annular concave-convex groove 120 is formed on an inner circumferential surface, and the rotating spiral shaft 200 is a concave-convex protrusion formed at a certain distance in the longitudinal direction of the outer circumferential surface on the upper part of the rod 210. The chair height adjusting device, characterized in that the groove 220 is assembled by slide fit to provide mutually synchronized rotation.
According to claim 1,
In the lifting guide hole 431 penetrating the lifting guide part 430, the shaft hole 431a and the rod 210 of the rotating spiral shaft 200 are formed in a state in which the shaft hole 431a and the protruding holes 431b are formed through the shaft hole 431b on both sides of the shaft hole 431a. It is inserted into the shaft hole 431a and assembled with the traction rotating plate 100, and the anti-rotation protrusion 320 of the lifting support ring 300 is assembled with the protrusion hole 431b,
The lift support ring 300 assembled to the rod 210 through the shaft hole 310 by the rotation of the rotation spiral shaft 200 due to the forced rotation of the traction rotation plate 100 is the rotation spiral support protrusion 230 The lifting spiral protrusion 330 rises along the spiral surface of the lifting guide portion 430,
At the same time as the forced rotation of the traction rotary plate 100 is released, the compression spring 422 interposed between the bending extension end 421 extending from the front end pressing part 420 of the rotation pressing plate 400 and the damper block 50 The spiral surface of the rotating spiral support protrusion 230 is caused by the lifting and restoring of the front end pressing portion 420 by the elastic force of ) and the downward rotation of the lifting guide portion 430 and the reverse rotation of the rotating spiral shaft 200 at the same time. The chair height adjusting device, characterized in that the lifting spiral projection 330 of the lifting support ring 300 descends along the traction rotation plate 100 to restore and rotate to its original state.
According to claim 4,
The traction rotation plate 100 has a fan-shaped wire fitting groove 130 formed on one side, and the support plate 500 has a stopper protrusion 540 for stopping the maximum rotation of the traction rotation plate 100 and the wire ( A chair height adjusting device characterized in that the wire guide protrusion 550 guiding the traction of W) is molded on the upper part.
According to claim 1,
Chair height, characterized in that the rapid rise or fall is prevented by moving the lift or fall between the lift support rings 300 according to the rotation of the rotating spiral shaft 200 by spiral rotation by moving in close contact with each other's spiral surfaces regulator.

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