JPH0856767A - Chair provided with simplified gas spring removing and attaching mechanism - Google Patents

Abstract

PURPOSE: To enable the attaching and removal of a gas spring to and from a chair without disassembling a chair by unitizing the gas spring and a mechanism for attaching the gas spring to the chair. CONSTITUTION: A gas spring unit A composed of a gas spring 6 for controlling the reclining angle of the chair back and a spring retainer 5 is connected between a receiving bed 1 integrally incorporated with the upper part of a leg and arranged below a seat support 2, and a support column receiver 3 for a chair back support column 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an office chair, and more particularly to a gas spring simple attachment / detachment mechanism which facilitates replacement with a new one when the gas spring used for controlling the reclining angle of the backrest is defective. Regarding the equipped chair.

[0002]

2. Description of the Related Art Conventionally, a tilted gas spring has been generally used in office chairs in which the back and back seats are synchronously tilted to stop the back seat at an arbitrary position. However, this tilted gas spring has a large stroke frequency due to use, and the maximum number of uses guaranteed by the manufacturer almost reaches within one to six years. This deterioration of the moth spring has a high possibility of making the chair unusable, and the necessity of maintenance replacement has been emphasized.

[0003]

However, the conventional chair is mounted in a small pedestal for structural design reasons, and the ease of disassembling is not taken into consideration. Since there are many parts to be disassembled around it, and various tools are required accordingly, it takes a lot of time and effort to replace them.

That is, although there are other use examples for the arrangement of the gas springs in the office chair at present, there is a general case shown in FIG.
6 to 20 are often used.

The structure is basically the working side (back K ₁ ,
The seat K ₂ ) and the fixed side (pedestal) M are connected by the gas spring N, and N is operated to set K (a).
Of is intended to the horizontal state and the inclined state of (b), FIG. 16 is a back K ₁ and the seat K ₂ is integrally, formed by tying the N directly therewith and cradle M, 17 and K ₁ K ₂ is a separate body, K ₁
And M are connected by N, FIG. 18 is the same as that in which K ₂ and M are connected by N through an elongated hole, and FIG. 19 is that K ₂ is fixed and K ₁ and M are connected by N In FIG. 20, K ₂ is movable, and K ₁ and M are connected by N via links O and P, respectively. In this way, the gas spring N is structurally
In most cases, it is mounted inside the pedestal M.

However, the general appearance structure of the gas spring N which has been conventionally used is shown in FIG.
(B) As shown in the side view, both ends consist of a rod side Na provided with a threaded portion and a base side Nb, the rod side Na is attached to the push valve V side by a screw at the tip, and the base side Nb is a counterpart. It is adapted to be fixed to the side L by a pin or the like.

Of these, regarding the attachment of the base side Nb,
(A) side in FIG. 22, (b) when inserting the pin L ₂ is a bracket L ₁ which is fixed to a front transverse insert pin L ₂ length of the like (c) Space is required. In order to avoid this, FIG.
(B) side, placed by inserting the pins L4 bracket L3 pre unfixed proximally Nb as shown (c) a front fastening with bolts L ₅ of the plurality of the bracket L ₃ in company mating L integrally There is a mounting method that is fixed by fixing.

However, in mounting these components, many components such as an up-down lever, a tilt lever, and a tilt spring, which are not shown in the figure, are mounted at the same time.
It is extremely difficult to remove the gas spring because there is a very limited space. Therefore, even if there is a space, it is necessary to expose the gas spring N as shown in FIG. 19, and it is impossible to replace it with a normal tool alone.

In view of this, the present invention has unitized a gas spring and a mechanism for attaching to a chair. This unit can be attached and detached without disassembling the chair, and the gas spring can be easily removed from this unit. The purpose of the present invention is to provide a chair equipped with the simple attachment / detachment mechanism for the gas spring described above and to eliminate the drawbacks of the prior art.

[0010]

In order to achieve the above object, the present invention provides a pedestal on the upper part of a leg, and a seat pedestal for a seat portion and a stanchion support for a backrest stanchion are provided above the pedestal, respectively. In the provided chair, a gas spring for controlling the reclining angle of the backrest and a gas spring unit composed of the spring mounting metal fitting are connected between the pedestal and the column support, and the seat support is detached. As a result, the upper portion is opened, and the seat portion on which the unit can be easily attached and detached is placed.

In addition, in the gas spring unit, the base of the gas spring is connected to the column receiving side, and a spring mounting member is swingably attached to the rod tip of the gas spring, and the mounting member is connected to the pedestal side. The feature is that it is done.

Further, the gas spring 1) is provided with a hook on the base side, which engages with the horizontal shaft on the strut receiving side.

2) A shaft having a two-face width which is inserted into the base side or the rod side through a notched hole of a pair of brackets fixed to the mounting side and which is prevented from coming off by rotation.

3) A mounting bracket is provided on the pin on the base side, and the mounting bracket has a mounting surface and a hook portion that engage with the mounting surface and the hook portion, respectively, provided on the support post. Some of the two mounting surfaces can be fastened with bolts.

The mounting metal fitting provided on the rod portion of the gas spring includes: 1) a peripheral edge of the mounting metal fitting mounting hole on the pedestal side, a claw for engaging a shift preventing claw and a fixing screw, and a shift. With holes for the stopper and fixing screws.

2) A claw that engages with the mounting bracket mounting hole on the pedestal side, and a collar portion that can be tightened with a bolt to the pedestal.

3) There is one in which an engaging portion to be fitted in a notch portion of a mounting seat fixed to the pedestal and a brim portion which overlaps the mounting surface of the mounting seat and can be tightened by a bolt are provided.

[0018]

According to the above construction, since the upper portion of the gas spring unit is opened by removing the seat portion, the base portion of the gas spring forming the gas spring unit is located between the pedestal and the column receiver on the column receiving side. By connecting the rod end of the gas spring to the pedestal side via the spring mounting bracket, the unit can be easily installed and can be removed by performing the reverse operation, so the unit can be easily replaced. .

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in FIGS. A chair provided with a gas spring simple attachment / detachment mechanism according to the present invention is a pedestal integrally provided on the upper part of a leg (not shown) and a pedestal as shown in a perspective view in which parts above the pedestal are exploded in FIG. A seat support 2 for a seat portion and a support post 3 for a backrest support 4 are provided above 1 respectively. A gas spring unit A including a gas spring 6 for controlling the reclining angle of the backrest and a spring mounting member 5 is connected between the cradle 1 and the column support 3.

That is, as shown in FIGS. 1 and 5 to 8, the pedestal 1 is integrally attached to the upper part of the leg in a slanting manner, with the left and right elongated holes provided in the middle in the longitudinal direction thereof. The guide bushes 13, 13 with long holes are attached, and the column support 3
One side is connected by a pin 11 mounted in the middle of the pedestal 1 and is movable in the guide bush 13.

The seat support 2 is formed in a frame shape by front, rear, left and right members so that a central portion thereof is opened. The seat support 2 is seated on one side of the support 1 so as to cover the upper parts of the support 1 and the column support 3. One end of the vertical portion of the bridge 2 is connected by a pin 7.

The other end of the seat support 2 is connected to the other side of the column support 3 by a pin 8. A pipe-shaped horizontal shaft 9 is rotatably fitted to the outer periphery of the pin 8, and one lever 10 is fixed to one side of the outer periphery of the horizontal shaft 9 at a right angle.
The horizontal axis 9 is formed in the central portion in the longitudinal direction so as to have a width across the two parallel surfaces.

Further, between the other side of the pedestal 1 and the other side of the seat support 2, two parallel coil springs 16, 16 for cushioning a load applied to the seat support 2 are vertically installed. There is.
In FIG. 1, 14 is an operation lever, the tip of which is inserted into a U-shaped notch mounting portion 12 provided on one side of the pedestal 1 in the left-right direction and fixed by a pin 17, and 19 is a crank. With the vertical operating lever of the seat, only one side is accommodated in the pedestal 1 through the U-shaped notch provided on the other side of the pedestal 1 in the left-right direction. It is attached by a screw 18 so as to be rotatable from the outside.

A mounting hole 1a which is opened for mounting the gas spring unit A is provided at the bottom of the pedestal 1.

The gas spring unit A, which is an essential part of the present invention, has the gas spring 6 and its mounting bracket 5 as described above.
As shown in FIG. 2, the gas spring 6 has a predetermined length and a predetermined thickness, both ends have different diameters, and the horizontal axis 9 of the horizontal shaft 9 is provided on the base side. A hook 6b that engages with the width across flats is formed, and a threaded portion 6a is provided on the rod side.

As shown in FIG. 3, the details of the mounting bracket 5 are as follows: the mounting portion 5a of the screw portion 6a, the cradle mounting claw 5b having a pair of spaced claws, and the back side of the cradle mounting claw 5b. A shift preventing portion 5c in which both ends of the pin 5f are supported so as to sandwich the mounting portion 5a from both sides, a pair of darma holes 5d provided in flange portions protruding to both outer sides of the upper portion of the shift preventing portion 5c, and the pin The push lever 5e is fixed to a pipe that is rotatably fitted to the 5f and has a bent middle portion.
And so on.

Of these, the mounting portion 5a is rotatably supported at both ends with respect to the shift prevention portion 5c, and a screw hole for screwing with the screw portion 6a of the gas spring 6 is provided in the central portion. Therefore, the gas spring 6 is integrated with the mounting member 5 by screwing the screw portion 6a into the mounting portion 5a, and the gas spring unit A is formed.

FIG. 4 shows the details of the above-mentioned mounting hole 1a of the gas spring unit A provided on the pedestal 1.
A retaining stopper claw 1b is provided on both sides of the central portion in the longitudinal direction around a, and a nut-shaped member having a pair of screw holes of a fixing screw 15 is provided at a position close to the stopper claw 1b and corresponding to the darma hole 5d. The pedestal 1 and the gas spring unit A are integrally mounted by aligning the dullama hole 5d with the screw hole of the member and tightening the fixing screw 15. In this case, the peripheral edge 1c of the part where the hole 1a is partially widened in the vicinity of the fixing screw 15 side serves as a mounting portion for the shift preventing portion 5c.

Further, as shown in FIG. 5, a seat cover 21 having an open central portion is provided on the upper part of the seat support 2 like the seat support 2, and a seat part formed of a cushion is provided on the upper part of the seat cover 21. 20 (two-dot chain line) is detachably mounted.

Next, the assembling work will be described.

In FIG. 5, in order to mount the gas spring unit A (parts shown in the upper part) which has not been mounted yet, the seat portion 20 is first removed. As a result, the gas spring unit A is inserted in the direction of the arrow through the opened hole of the seat cover 21.

Then, as shown in FIG. 6, the pipe-shaped horizontal axis 9
The fixing lever 10 welded to the base is raised so that the pedestal mounting claw 5b of the mounting bracket 5 is in the hole 1 of the pedestal 1.
After being hooked on the peripheral edge 1c of a, the fixing screw 15 provided on the pedestal 1 is fitted with the darma hole 5d. Then, after confirming that the shift preventing portion 5c is hooked on the shift preventing claw 1b, the fixing screw 15 is tightened to fix the gas spring unit A to the pedestal 1.

Next, as shown in FIG. 7, the gas spring 6
Is rotated about the mounting portion 5a as a fulcrum and the hook 6b
When the orientation is the same as the width across flats, the hook 6b is fitted on the horizontal shaft 9, the fixing lever 10 is returned, and the seat portion 20 is attached to the upper surface of the seat cover 21 to complete the assembling work. This state is shown in FIG.

Although the case where the gas spring unit A is mounted has been described above, when the gas spring unit A is to be detached for replacement or the like, the procedure can be reversed.

FIG. 9 shows a second embodiment in which the base portion or rod of the gas spring 6 is attached to the column support 3 or the attachment fitting 5 via the bracket 22, and the attachment side of the gas spring 6 to the bracket 22 is shown. A shaft 6c having a width across flats is provided at both ends, and a pair of brackets 22, 2
2 is accommodated in both ends of the shaft 6c through the notches 22a, and the hole 22
Hole 2 so that it can be prevented from coming off by rotating in b
It may be a pair of angle-shaped ones having 2b and a notch 22a.

To take out the gas spring 6 from the gas spring unit A, the connection with the fitting 5 is removed.

Although the present invention shows the operating levers 14 and 19 in FIGS. 1 and 5 to 8, the reclining of the backrest by this operation is not directly related to the gist of the present invention. The detailed description of is omitted.

FIG. 10 shows a third embodiment in which the base portion of the gas spring 6 of the present invention is attached to the column support 3, and FIG. 10 (a) shows that the guide 31 having the notch 31a is fixed to the column support 3 in advance. However, the base of the gas spring 6 has a pin 3
A mounting bracket 33 is rotatably mounted around the pin 2, and the pin 32 is inserted through a large hole of a long hole provided in the mounting bracket 33. Then, as shown in (b), the base of the gas spring 6 is moved in the direction of the arrow so that the guide 3
The pin 32 is inserted into the one notch 31a.

Next, the mounting member 33 is rotated while being brought into contact with the wall surface of the guide 31, and the flange portion 33a is brought into contact with the support pillar support 3 as shown in FIG. It is inserted and tightened and fixed. Here, (d) is a plan view of (c). By doing so, the base side of the gas spring 6 is attached to the column support 3 so as to be vertically rotatable. When removing it, the reverse operation may be performed. In this case, the notch 31a can slide in a direction perpendicular to the longitudinal direction of the pin 32, and a strong load can be applied here and rattling can be suppressed at the same time.

FIG. 11 is an explanatory view of a gas spring replacement according to another embodiment of the present invention. This is similar to the one shown in FIG. 5, in which the supporting post receiver 3'assembled with the seat part removed and the disassembled seat receiver 2'on the upper part of the pedestal 1'are called the pedestal 1 '. The state shown in the drawing is obtained by removing the bolt 35 and the tightening seat 36. In the case of this embodiment, the pedestal 1'is made of aluminum die cast, and a pair of ribs 1a 'are provided at the center of the inside to secure the strength of the pedestal 1'
Since one end of the gas spring 6 reaches the central tube receiver 37, it is difficult to perform maintenance from the side when replacing the gas spring 6.

The seat 2'is attached to the pedestal 1'by fitting a pair of claws 2b 'provided on the side of the seat 2'into holes 1b' provided in the pedestal 1 '.

The push valve side X attached to the tip of the rod of the gas spring 6 can be released from the cover 39 on the pedestal 1'by removing the three bolts 38 as shown in an enlarged view in FIG. On the base side Y, as shown in an enlarged view in FIG. 13, a support 3'is provided with a mounting surface 3a 'having a screw hole and a hook portion 3b', and the base end of the gas sub-ring 6 is pinned there. One side of the mounting bracket 40 integrally mounted by 32 is engaged with the hook portion 3b ',
Since the mounting surface 40a on the other side is fitted to the mounting surface 3a 'of the column support 3'and is fastened to the screw hole by the bolt 41, this is shown in (a)-(b)-(c)-(d) of FIG. ), The removal of the gas spring unit A on the base side is completed.

FIG. 14 shows a third embodiment showing the relationship between the push valve side fitting 5'that is attached to the rod end of the gas spring 6 and the mating pedestal 1 '.
This is a modification of the embodiment shown in FIG. 3 described above, and since the main points are the same as those in FIG. 3, a detailed description thereof will be omitted. In this case, the mounting method of the gas spring mounting bracket 5'to the receiving base 1'is In the front and rear holes 1c 'and 1d' provided in the base 1 ', a pair of claws 5a', 5a 'provided at the tip of the mounting member 5'and a pair of claws 5b' {(a First, insert the claw 5a 'into the hole 1c' as shown in (b), then insert the claw 5b 'into the hole 1d' as shown in (c), and further as shown in (d), the collar portion. 5d 'is brought into contact with the pedestal 1', and bolts 42 are passed through the bolt holes 5c 'shown in FIG. This is the reverse operation for removal.

FIG. 15 shows a fourth embodiment showing the relationship between the push valve side fitting 5 "to which the rod end of the gas spring 6 is attached and the mating pedestal 1 '.
This case is also a modified example of the embodiment of FIG. 3 as in FIG. 14, and detailed description of the mounting bracket 5 ″ will be omitted.
As shown in (a) a plan view and (b) a side view, a pair of mounting seats 43 are fixedly placed on the pedestal 1 ′ in advance, and a notch 43 a provided in the mounting seat 43 and a mounting surface 43 b of the mounting bracket 5 ″. After engaging the mounting metal fitting 5 ″ as shown in (c), the mounting surface 43b and the collar portion 5a ″ of the mounting metal fitting 5 ″ are aligned and tightened by the bolts 44 as shown in (d). is there. And when removing, it becomes the reverse operation.

[0045]

As described above, according to the present invention, the gas spring can be easily replaced by simply removing the seat without disassembling the chair body.

Therefore, even if a gas spring fails, the user can easily replace the gas spring that had been conventionally requested by the manufacturer with replacement parts. Further, even when the chair in use is discarded, since the replacement operation is easy, only the expensive gas spring can be recovered from the chair and reused.

Further, by unitizing the gas spring and the mounting bracket, the processing efficiency can be improved and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing disassembly of components of an embodiment of a chair equipped with a gas spring simple attachment / detachment mechanism according to the present invention.

FIG. 2 shows the gas spring alone of FIG.
(A) is a top view and (b) is a side view of (a).

3A and 3B show the mounting bracket alone of FIG. 1, in which FIG. 3A is a side view and FIG. 3B is a top view of FIG.

4A and 4B show a relationship between a mounting hole portion and a mounting metal fitting provided in the pedestal in FIG. 1, where FIG. 4A is a top view and FIG. 4B is a side view of FIG.

FIG. 5 is a side view showing an assembled state (1) of the chair of the present invention.

FIG. 6 is a side view showing an assembled state (2) of the chair of the present invention.

FIG. 7 is a side view showing the assembled state (3) of the chair of the present invention.

FIG. 8 is a side view showing an assembled state (4) of the chair of the present invention.

FIG. 9 is a perspective view of a second embodiment of a connecting portion between a base portion or a rod of a gas spring of the present invention and a fixing metal fitting on a mounting side.

FIG. 10 shows a third embodiment of the connecting portion between the base of the gas spring and the fixing metal fitting of the present invention, FIG.
(B) is during joining, (c) is each side view after joining, (d) is a plan view of (c).

FIG. 11 is a perspective view showing disassembly of components of another embodiment of the chair having the gas spring simple attachment / detachment mechanism according to the present invention.

12 is an enlarged perspective view of a portion X in FIG.

FIG. 13 is an enlarged view of a portion Y in FIG. 11, showing a fourth embodiment of the connecting portion between the base portion of the gas spring and the fixing metal,
(A) is a cross-sectional view of the completed mounting, (b) is a cross-sectional view of the bolt removed from (a), (c) is a perspective view of (b),
FIG. 6D is a perspective view showing a disassembled state from the assembled state of FIG.

14A and 14B show a second embodiment in which a mounting bracket integrally assembled with a rod tip of a gas spring, which is an essential part of the present invention, is attached to a pedestal. FIG. 14A is a plan view and FIG. Before,
(C) is a cross-sectional view of the state during mounting, and (d) is a state immediately before the completion of mounting.

15A and 15B show a third embodiment in which a mounting bracket integrally assembled with a rod end of a gas spring of an essential part of the present invention is mounted to a pedestal, (a) is a plan view, and (b) is before mounting. , (C)
Is a sectional view of each state during mounting, and (d) is a state immediately before completion of mounting.

FIG. 16 is a side view showing a first example of the arrangement of gas springs in the current office chair, where (a) is the seat horizontal and (b) is the seat tilted.

FIG. 17 is a side view showing a second example of the arrangement of gas springs in the current office chair, where (a) is the seat horizontal and (b) is the seat tilted.

FIG. 18 is a side view showing a third example of the arrangement of gas springs in the current office chair, where (a) is the seat horizontal and (b) the seat is tilted.

FIG. 19 is a side view showing a fourth example of the arrangement of gas springs in the current office chair, where (a) is the seat horizontal and (b) the seat is tilted.

FIG. 20 is a side view showing a fifth example of the arrangement of gas springs in the current office chair, where (a) is the seat horizontal and (b) is the seat tilted.

FIG. 21 is a plan view and (b) is a side view showing the appearance of a general gas spring that has been conventionally used.

22A and 22B show a first example of a method of mounting the base portion of the gas spring of FIG. 21 and a mating side, (a) is a side view, (b) is a front view, and (c) is a mounting pin insertion state of (b). Front view in front.

23A and 23B show a second example of a method of attaching the base portion of the gas spring of FIG. 21 and the other side, wherein FIG. 23A is a plan view, FIG. 23B is a side view, and FIG.

[Explanation of symbols]

 1 pedestal 1a hole 1b anti-slip claw 1c peripheral edge 2 seat receiver 3 post receiver 4 backrest post 5 mounting bracket 5a mounting part 5b mounting claw 5c misalignment part 5d dharma hole 6 gas spring 6a screw part 6b hook 6c member 9 horizontal shaft Fixing screw 20 Seat portion A Gas spring unit 22 Bracket 22a Notch 22b Hole 31 Guide 31a Notch portion 33 Mounting bracket 33a Collar portion 34 Bolt 40 Mounting bracket 40a Mounting surface 41, 42 Bolt 43 Mounting seat 43a Notch portion 43b Mounting surface 44 Bolt 1'Receptor 1c ', 1d' Hole 2'Seat receiver 3'Post support 3a 'Mounting surface 3b' Hook part 5'Mounting bracket 5a ', 5b' Claw 5d 'Collar part 5 "Mounting bracket 5a" Collar part

Claims (9)

[Claims] 1. A chair provided with a pedestal on the upper part of a leg, and a seat pedestal for a seat portion and a stanchion support for a backrest stanchion above the pedestal, respectively. To
A gas spring unit for controlling the reclining angle of the backrest and a gas spring unit composed of the spring mounting bracket are connected to each other, and an upper portion of the seat rest is opened by detaching, so that the unit can be easily attached and detached. A chair equipped with a gas spring simple attachment / detachment featured by mounting a seat portion. 2. In the gas spring unit, a base portion of the gas spring is connected to the strut receiving side, and a spring mounting member is swingably attached to a tip end of a rod of the gas spring, and the mounting member is attached to the pedestal side. The chair provided with the simple attachment / detachment mechanism of the gas spring according to claim 1, wherein the chair is connected. 3. A chair equipped with a gas spring simple attachment / detachment mechanism according to claim 2, wherein said gas spring is provided with a hook on the base side that engages with a lateral shaft on the side of the supporting column. 4. The gas spring has a two-face width which is inserted into a base side or a rod side from a hole having a notch of a pair of brackets fixed to its mounting side so as to prevent the bracket from coming off by rotation. A chair provided with a simple attachment / detachment mechanism for a gas spring according to claim 2, wherein a chair is provided. 5. The gas spring is provided with a mounting bracket on a pin on the base side, and the mounting bracket is pivoted around a guide which is fixed to the supporting column holder and holds the pin to support the supporting column. A chair provided with a simple attachment / detachment mechanism for a gas spring according to claim 2, wherein a flange portion for attachment that can be fixed with a bolt is provided. 6. The gas spring is provided with a mounting member on a pin on the base side, and the mounting member has a mounting surface and a hook which respectively engage with a mounting surface provided on the strut receiver and a hook portion. 3. The chair having the gas spring simple attachment / detachment mechanism according to claim 2, characterized in that both mounting surfaces can be fastened with bolts. 7. A mounting metal fitting provided on a rod portion of the gas spring includes a peripheral edge of the mounting metal fitting mounting hole on the pedestal side, a claw for locking and a locking metal for engaging with a fixing screw, respectively. A chair provided with a simple attachment / detachment mechanism for a gas spring according to claim 2, characterized in that holes for the parts and fixing screws are provided. 8. A mounting metal fitting provided on a rod portion of the gas spring includes a claw that engages with the mounting metal fitting mounting hole on the pedestal side, and a collar that can be tightened with a bolt to the pedestal. A chair provided with a simple attachment / detachment mechanism for a gas spring according to claim 2, characterized in that the chair is provided. 9. A mounting metal fitting provided on a rod portion of the gas spring is provided with an engaging portion that is fitted in a notch portion of a mounting seat fixed to the pedestal and a bolt that overlaps a mounting surface of the mounting seat. A chair provided with a simple attachment / detachment mechanism for a gas spring according to claim 2, further comprising a collar portion that can be tightened.