JP4384002B2 - Gas spring operating device for chair - Google Patents

Description

  The present invention relates to an operating device for operating a gas spring for adjusting the height of a seat provided in a chair or adjusting the tilt angle of a backrest.

As a conventional device of this type, with the gas spring facing in the front-rear direction, one end of the gas spring is connected to the lower surface of the front portion of the seat, and the other end is connected to a support base (base frame) below the seat. The operating member (swing member) of the gas spring and the operating lever provided below one side of the seat are connected by a wire inserted through a flexible guide tube (wire cover), and by operating the operating lever, There is one in which the operating member is moved and the gas spring is switched between a free state and a locked state so that the inclination angle of the seat can be adjusted (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 7-21140

  However, in the conventional apparatus as described above, if the guide tube is bent with a small curvature, the movement of the wire becomes unsmooth, so it must be bent with a large curvature, and the moving direction of the operating member of the gas spring And the direction of movement of the control lever are almost perpendicular, and there is a leg rod behind the gas spring, which interferes with the placement of the guide tube. Must be arranged in this way. Therefore, a long guide tube must be used, which is uneconomical.

  In view of the above-mentioned problems of the prior art, the present invention operates a gas spring actuating member and an operating lever smoothly with a short guide tube and a wire without greatly bending them. It is an object of the present invention to provide a gas spring operating device in a chair that can be connected in a swift manner.

According to the present invention, the above problem is solved as follows.
(1) When each end is connected to the stationary part and the movable part of the chair and the push valve is in the inoperative position, the movable part cannot be moved and the push valve is pushed to the operational position. In this way, the operating member that pushes the push valve in the gas spring that enables the movable portion to move and the operating lever provided at a proper position of the chair are connected by a wire, and the wire is connected to the axis. One end of a flexible guide tube inserted so as to be slidable in the direction is fastened to a gas spring operation portion in the vicinity of the operating member, and the other end of the guide tube is in a chair in the vicinity of the operation lever. In the gas spring operating device in the chair fixed in place, one end of the guide tube is in a direction different from the moving direction of the operating member or the operating lever. And the guide so as to face the right direction convenient for the connection between the other end and the operating lever side or the operating member side of the tube, was attached as a detachable position of the chair near the gas spring operating portion or lever bracket A hook groove-like shape is fixed to a fixing portion provided in the guide member and slidably guides the wire extending from one end of the guide tube to the bracket so as to be deflected in the moving direction of the operating member or the operating lever . setting the arcuate guide portion forming a guide surface on the arcuate surface Keru.

(2) In the above paragraph (1) , the gas spring is directed in the front-rear direction, one end of the gas spring is connected to the front part of the support base, and the other end is integrated with the backrest pivotally attached to the support base. The wire extending from one end of the guide tube fixed to the gas spring operation part so as to be connected to the tip of the arm part rotating in the front-rear direction and facing the direction substantially perpendicular to the longitudinal direction of the gas spring, The guide part is bent so as to be directed substantially in the longitudinal direction of the gas spring, and one end of the wire is fixed to the operating member that is moved in the longitudinal direction of the gas spring.

(3) In the above item (1) or (2) , the control lever is pivotally attached to the appropriate position on the outer side surface of the chair with a shaft facing in the front-rear direction, and one end of the guide tube extends forward. Then, fix the wire extending from one end of the guide tube to the appropriate position on the chair near the operation lever, and warp the wire so that it almost faces the rotation direction of the operation lever. To wear.

According to the present invention, the following effects can be achieved.
According to the present invention 請 Motomeko 1, wherein the guide portion having an arcuate guide surface, the wire only be curved, since so as to change the orientation of the wire, small sliding resistance than for bending each guide tube In addition, the direction of the wire can be changed with a small curvature.
In addition, since one end of the guide tube can be fixed to an appropriate position of the chair near the gas spring operation part or the operation lever in a direction crossing the moving direction of the operating member of the gas spring, Can be oriented in a direction convenient for connection on the other end side of the guide tube, so that the guide tube can be routed without being greatly curved. Therefore, the guide tube and the wire can be shortened, which is economical.
In addition, since it is only necessary to provide the guide portion near the end portion of the guide tube, the structure is simple and it can be manufactured at low cost.

Furthermore , the guide part can be easily attached to and detached from the gas spring operating part or the chair in the vicinity of the operating lever together with the bracket.
Also , attach one end of the guide tube to the bracket, and with the guide tube, bracket and its guide united together, place the bracket so that the guide tube faces the optimal direction, and It can be attached to an appropriate position on a nearby chair, and the attachment workability is improved.

According to the present invention 請 Motomeko 2 wherein, thereby unsuitable orientation of the backrest guide tube connected to the gas spring, such as a tilt angle adjustment of the right direction convenient for connection between the guide tube and the operating lever .

According to the present invention 請 Motomeko 3 wherein, be suited to the orientation of the guide tube which is fastened in place of the chair near the operating lever, in the right direction convenient for connection between the guide tube and the gas spring operating portion it can.

Hereinafter, a reclining chair provided with one embodiment of the present invention is explained with reference to an accompanying drawing.
As shown in FIGS. 1-3, this reclining chair is provided with the leg body (3) which has the five leg rods (2) which make | form the radial shape by which the caster (1) was provided in the front-end | tip part. A telescopic leg column (5) having a gas spring (4) is erected at the center of the leg body (3), and a rear portion of the support base (6) is located at the upper end of the leg column (5). It is fixed.

  The support base (6) has a substantially hollow box-shaped support basic body (6a) having a rhombic shape in plan view and opened on the upper surface of the front half extending toward the front upper side, and the opening on the upper surface of the front half is It is covered with a removable upper cover (7). A pair of left and right sides of the support basic body (6a) that extend diagonally upward toward the left and right sides of the front part of the support base body (6a) and whose top end face is located above the support base body (6a). The arms (6b) and (6b) are integrally formed.

  Near the center of the support base (6a) in the front-rear direction, there is a pivot (8) that faces the left and right sides with square shafts (8a) (8a) at both ends. The corner shafts 8a and 8a on both ends of the pivot shaft 8 projecting to both sides are located in front of the pair of left and right back support rods 10 and 10 that support the backrest 9. A cylindrical portion (10a) (10a) facing the left and right direction formed at the front end of the lower portion is fixed, and the pivot (8), the backrest support rods (10) (10), and the backrest (9) Centering on the axis of the pivot (8), they can be integrally rotated with respect to the support base (6).

The support base (6) is provided with a biasing means (A) for biasing the backrest (9) in a direction to stand up via the pivot (8) and the backrest support rods (10), (10). Yes.
As shown in FIG. 3, the urging means (A) is a rotational urging force comprising two rubber torsion springs (11) and (11) for urging the pivot (8) counterclockwise in FIG. The gas spring unit (D) including the means (B), the biasing force adjusting means (C) (see FIGS. 7 and 11), and the gas spring (12) is provided.
The urging means (A) will be described in detail later, and first, the schematic configuration of the entire reclining chair will be briefly described.

  The lower surfaces of the left and right rubber torsion springs (11), (11) are covered with a pair of left and right lower covers (13), (13) that are detachably provided on the lower surface of the support basic body (6a).

  As shown in FIGS. 3 to 6, the left and right back support rods (10) and (10) have a portion slightly behind the pivot (8) in the upper direction perpendicular to the longitudinal direction of each back support rod (10). The short projections (10b) and (10b) facing each other are provided, and at the upper end of each projection (10b) is a pair of left and right seats facing the front and rear directions that support both sides of the seat (14) The rear ends of the receiving frames (15) and (15) are connected to each other with a shaft (16) facing in the left-right direction.

The front part of each seat frame (15) has a box shape with an open top surface and extends downward, and its lower end surface forms an inclined surface (17) inclined downward and downward, and the inclined surface ( 17) A standing wall (18) facing the rear upper side is formed continuously to the rear end.
Each inclined surface (17) is slidably mounted in the front-rear direction on an inclined receiving surface (19) formed on the upper surface of the tip of the arm portion (6b) of the support base (6) and inclined downward. Has been.

The inclined surface (17) is separated from the inclined receiving surface (19) upward between the tip of the arm (6b) of the support base (6) and the front portion of the seat receiving frame (15). A stop means (20) for blocking is provided.
In this example, the detachment prevention means (20) includes a long hole (21) facing the front-rear direction provided on the inclined surface (17) and a protrusion provided on the inclined receiving surface (19) and is slid into the long hole (21). It has a headed shaft (22) that is movably fitted and has an enlarged head (22a) that is larger than the width of the long hole (21). 19) and the headed shaft (22) may be provided on the inclined surface (17). In the illustrated example, the portion corresponding to the shaft portion of the headed shaft (22) is a vertical plate shape facing the front-rear direction, but this may be a circular shaft.

  The long hole (21) extends rearward from the vicinity of the front end of the inclined surface (17), and the rear end opens rearward from the standing wall (18). The standing wall (18) has an opening (23) through which the enlarged head (22a) of the headed shaft (22) communicates with the long hole (21) and projects (19) on the inclined receiving surface. Is provided.

  Accordingly, the inclined surface (17) is slid rearward along the inclined receiving surface (19) while introducing the headed shaft (22) from the opening (23), and the rear end of each seat receiving frame (15) Assemble each seat frame (15) to the support base (6) and the backrest support rod (10) easily and quickly by connecting the part to the backrest support rod (10) with the shaft (16). be able to.

  After the assembly, the seat back frame (15) and the seat (14) supported by the backrest (9) are moved from the state shown in FIG. As shown in FIG. 5, the inclined surface (17) is moved rearward and downward while sliding along the inclined receiving surface (19).

The movement of the backrest (9) and the seat (14) at this time causes the angle between the back and the thigh of the seated person and between the thigh and the lower leg to naturally expand, and the lower leg The part is gently tilted backwards with the heel of the foot in contact with the floor as the center, so that the seated person can have a comfortable and comfortable movement.
In addition, when the backrest (9) is moved from the rearward tilted state to the standing state, the seat (14) moves in the opposite direction to the above, and at this time, the seated person feels comfortable and comfortable to move. Can be given.

  If the inclined surface (17) and the inclined receiving surface (19) are completely straight when viewed from the side, the seat (14) moves rearward and downward in conjunction with the backward inclination of the backrest (9). The contact surface may change from surface contact to line contact, but the inclined surface (17) and the inclined receiving surface (19) should be gently curved so that they always contact in a wide range. desirable.

  The seat (14) is a stretchable stretch material made of, for example, a mesh frame using a stretchable fiber, a fabric such as a plain woven fabric, or a synthetic resin film or the like on a seat frame (14a) having a substantially rectangular frame shape in plan view. When the seated person sits down, the upholstery material (14b) expands, and the central part of the seat surface is recessed downward along the buttocks of the seated person. Since the central part of the material (14b) sinks, a comfortable seating feeling can be given to the seated person.

  In order to allow the central part of such a seat (14) to sink when seated, the upper surface of the tip of the pair of left and right arms (6b) (6b) and the backrest support rod (10) ( 10) and the protrusions (10b) and (10b) support the four corners of the seat frame (14a) higher than the support base (6). A space (24) is formed between the upper surface of 6a) so that the center of the lower surface of the seat (14) can bend downward.

  The backrest (9) also has a stretchable material (9b) having the same elasticity as the above-mentioned upholstery material (14b) on the backrest frame (9a) having a substantially rectangular frame shape when viewed from the front in accordance with the seat (14). It is formed by stretching.

The seat (14) is mounted on the pair of left and right seat receiving frames (15) and (15) so that the front / rear position can be adjusted, but the specific configuration therefor is not directly related to the present invention. Such illustration and description are omitted.
If the seat (14) is not adjusted in the front-rear position, the rear portion of the seat (14) is directly projected on the left and right backrest support rods (10) (10) with the shaft (16) (10b) ( The lower surface of the front portion of the seat (14) may be attached to the upper surface of the tip portions of the left and right arms (6b) and (6b) so as to be slidable in the front-rear direction.

    Each backrest support ridge (10) is provided with an armrest (25), which is not directly related to the present invention, and therefore detailed illustration and description thereof will be omitted.

Next, the details of the urging means (A) will be described with reference to FIGS. 3 and 7 to 11.
As shown in FIG. 7, the urging means (A) includes two urging urging means (B) comprising two rubber torsion springs (11) and (11) provided at the lower part of the support base (6), and A biasing force adjusting means (C) provided on the upper part of the support base (6) and a gas spring unit (D) including a gas spring (12) are provided.

As shown in FIGS. 8 and 9, an arm portion (26) facing substantially downward is provided at the central portion of the pivot (8) so as to be orthogonal thereto, and rubber torsion springs ( 11) (11) is provided.
Each rubber torsion spring (11) includes an outer cylinder (27) having a pivot shaft (8) as a core and being concentric with the pivot shaft (8) and being prevented from rotating on a support base (6). It is filled between (27) and the pivot (8), and the pivot (8) is rotated around the central axis with respect to the outer cylinder (27), thereby elastically deforming and returning to the pivot (8). And an elastic body (28) such as rubber which is adapted to impart rotational power.

  Bearings (29) and (29) having positioning protrusions (29a) provided at the center of the upper surface are fitted on both sides of the pivot (8) protruding outward from each rubber torsion spring (11). .

  A semi-cylindrical portion (6c) is formed in the lower center of the support basic body (6a) so as to face in the left-right direction and open at the bottom surface. A pair of left and right lower covers (13) and (13) having a cylindrical shape are attached with set screws (30) and (30) (see FIG. 10).

  The left and right rubber torsion springs (11) and (11) are connected to the pivot shaft (8) and the pair of left and right rubber torsion springs (11) and (11) and the outer bearings (29 and 29). The semi-cylindrical portion (6b) and the lower cover (13) (13) are loosely fitted in the concave portions (31) and (32) formed in the facing portion, and the outer bearings (29) and (29) are the semi-cylindrical portions (6b) and the lower covers (13) and (13) (see FIG. 10), and both sides of the pivot (8) projecting further outward from the bearings (29) and (29) are semi-cylindrical portions (6b ) And the lower cover (13) and (13) are inserted into the semicircular cutouts (33) and (34) provided on opposite edges of both sides (see FIG. 9), and the support base (6) It is accommodated between the semi-cylindrical part (6b) and the lower covers (13) (13).

At the lower end of the arm (26), which is a movable part that hangs down between the left and right lower covers (13), (13), the rear lower end of the gas spring (12) facing forward and upward is It is connected with a shaft (35) facing.
The front upper end of the gas spring (12) has a head cover (36) and a shaft (37) facing in the left-right direction, and is connected to the center of the front end of the support basic body (6a) serving as a stationary part.
When the push valve (12a) provided at the front end of the gas spring (12) is pushed to the operating position, the gas spring (12) is urged to expand by the internal gas pressure and the urging force of the built-in auxiliary spring. This is a known type in which expansion and contraction becomes impossible when the push valve (12a) is returned to the inoperative position.

  As shown in FIG. 8, in the head cover (36) that forms the operating portion of the gas spring (12), there is an operating lever (operating member) (38) facing the substantially vertical direction for pushing the push valve (12a). The upper end portion is pivotally attached with a shaft (38a) pointing in the left-right direction, and the lower end portion of the operating lever (38) protruding forward and downward from the head cover (36) is provided with a flexible member in the wire unit (39). One end of a wire (41) inserted in a guide tube (hereinafter simply referred to as a tube) (40) so as to be slidable in the axial direction is fixed.

  As shown in FIG. 12, one end of the tube (40) is fixed to a fastening portion made of a bent piece (42a) provided on the right side surface of the bracket (42) fixed to the lower surface of the head cover (36) so as to be detachable. The wire (41) attached to the terminal and extending to the left from the terminal is formed in a groove-like shape formed on the arcuate surface of the quarter arcuate guide portion (42b) provided on the lower surface of the bracket (42). The direction is changed forward and upward along the guide surface (42c), and the front upper end thereof is fixed to the operating lever (38).

The other end of the wire (41) in the wire unit (39) protrudes from the operation lever (56) facing outward and pivotally attached to the middle part of the protrusion (10b) of the right backrest support rod (10). Through the window hole (57) provided in the intermediate portion of the portion (10b), the backrest support rod (10) is connected from the inner side.
As shown in FIG. 13, specifically, the operation lever (56) is pivoted with an axis (59) facing substantially in the front-rear direction on the upper portion of the box (58) fitted into the window hole (57) from the outside. It is worn.

  On the outer periphery and the upper and lower surfaces of the box (58), a flange (60) that is in contact with the outer surface of the protrusion (10b) of the support rod (10), and an inner surface of the protrusion (10b) Elastic engagement claws (61) (62) adapted to engage with each other, and when the box (58) is fitted into the window hole (57) from the outside, the protrusion of the support rod (10) At the same time that the flange comes into contact with the outer surface of the portion (10b), the elastic engagement claws (61) and (62) engage with the inner surface of the projection (10b), and the box (58) 57) is prevented from coming off.

  A tube mounting piece (63) is provided at the inner end of the box (58), and the other end of the tube (40) in the wire unit (39) extending from the inside of the chair is stopped here. It is worn.

By this wire unit (39), the operating lever (38) is linked to the operating lever (56), and when the operating lever (56) is pulled upward and outward, the operating lever (38) moves the push valve (12a) to the operating position. When the operation lever (56) is released, the operating lever (38) and the operating lever (56) return to the original inoperative position due to the return force of the push valve (12a) to the inoperative position. It can be restored.
The operating lever (56) may be provided with a spring (not shown) for returning to the inoperative position.

  A gas spring unit (D) is formed by the gas spring (12), the arm portion (26), the shafts (35) and (37), the head cover (36), and the like. The gas spring unit (D) acts to assist the urging force of the rotation urging means (B) when the push valve (12a) is in the operating position, and also to push the push valve (12a). By setting the inoperative position, the backrest (9) can be stopped steplessly at an arbitrary inclination angle.

  As shown in FIG. 11, the urging force adjusting means (C) for adjusting the initial urging force of the rotation urging means (B) is pivotally supported substantially at the upper center of the support basic body (6a). The left and right sides have a forward thread part (43) and a reverse thread part (44), and project outward from the support base body (6a) .In this example, the operation handle ( 45) and a pair of left and right movements having an operating shaft (46) facing left and right, and female screw holes (47) and (48) screwed into the forward screw portion (43) and the reverse screw portion (44). The pieces (49) and (50) and the rear end (base end) face the left and right direction connecting the outer peripheries of the outer cylinders (27) and (27) of the left and right rubber torsion springs (11) and (11). A connecting rod (52) facing the front connected to the shaft (51), a rear end portion is connected to each moving piece (49) (50) with a shaft (53) pointing up and down, and a front end portion is a connecting rod. It is connected to the front end (tip) of (52) and interlocked with the rotation of the operation shaft (46) to form a cross-sectional shape in plan view. By opening and closing, the pair of links (54) is configured such that the connecting rod (52) is moved in the front-rear direction to rotate the left and right outer cylinders (27), (27) around the central axis. ) (55).

In this example, the front end of the connecting rod (52) is supported by the support base body (6a) so as to be slidable in the front-rear direction, and the front end of the base piece (52a) facing forward in the connecting rod (52). The side protrusions (52b) having a backward U-shape when viewed from the side are provided, and at the inner corners of the side protrusions (52b) and the base pieces (52a), the links (54) (55) The front end is merely brought into contact so as to be rotatable about a vertical axis.
Even in such a configuration, the urging force of the rubber torsion springs (11) and (11) always acts to pull the connecting rod (52) backward, and a pair of left and right forming a C shape in plan view. Since the front ends of the links (54) and (55) are always positioned inward from the rear ends thereof, the front ends of the left and right links (54) and (55) are connected to the side protrusions (52b). It does not come off outward from the inner corner with the base piece (52a).

  However, the front end of each link (54) (55) is parallel to the vertical axis (53) connecting the rear end of each link (54) (55) to each moving piece (49) (50). These shafts (not shown) may be pivotally attached to the tip of the connecting rod (52).

  Thus, when the operation shaft (46) is rotated by the operation handle (45), the pair of moving pieces (49) and (50) move toward and away from each other, and accordingly, a pair of links (54) forming a letter C shape. (55) opens and closes to each other, and the connecting rod (52) is moved rearward and forward, whereby the outer cylinders (27) and (27) are rotated around the pivot axis, and the rotation urging means (B) As a result, the overall strength of the backrest (9) is weakened or strengthened accordingly.

The operation handle (45) at this time can be easily operated by the seated person in the seated posture and reaching out below the right side of the seat (14).
In this example, the pair of moving pieces (49) and (50) come close to each other, and the pair of links (54) and (55) forming a C-shape move in a direction to close each other. Since the biasing force of the biasing means (B) is set so as to increase, the amount of forward movement of the connecting rod (52) per rotation of the operating shaft (46) gradually decreases, and the expected backrest is assumed. Even if the force becomes large, the rotational resistance of the operating shaft does not increase, and the operating handle can be operated with light power all the time.

The middle part of the protrusion (10b) of the left backrest support collar (10) is the same as that provided at the intermediate part of the protrusion (10b) of the right backrest support collar (10) described above. A window hole (57), a box (58), an operation lever (56) and the like are provided symmetrically with the right one.
As shown in FIG. 7, one end of the wire (65) in the wire unit (64) shorter than the wire unit (39) is fixed to the left operation lever (56).

  The wire (65) is slidable in the axial direction in a flexible tube (66) having one end fixed to a tube mounting piece (63) (see FIG. 13) in the left box (58). Is inserted through.

As shown in FIG. 14, the other end of the tube (66) is a cylindrical operation part case (fitting) in a circular hole (67) facing the up-down direction provided at the center of the rear part of the support basic body (6a). 68) and is fixed to the tube mounting piece (69) standing up from the upper end edge.
The other end of the wire (65) extending from the other end of the tube (66) has an L-shaped front shape pivotally attached to the lower part in the operation portion case (68) with a shaft (70) facing in the front-rear direction. The operating lever (71) is fixed to the upper end portion of the upward arm portion (71a).

  The distal end portion of the lateral arm portion (71b) extending sideways at a right angle from the lower end of the upward arm portion (71a) in the operating lever (71) is a leg spring (5) gas spring for expansion and contraction ( 4) is located immediately above the push valve (4a) provided at the upper end of 4). When the wire (65) is pulled by the operation of the operation lever (56), the operation lever (71) is shown by a solid line in FIG. As indicated by the imaginary line, the push valve (4a) can be turned from the inoperative position shown in FIG.

  The gas spring (4) is a known one similar to the gas spring (12) described above. When the push valve (4a) is located at the inoperative position shown by the solid line in FIG. When the push valve (4a) is pushed down to the inoperative position indicated by the imaginary line, the push valve (4a) can be expanded and contracted, and is urged in the extending direction by the internal spring action to raise the support base (6). Works.

  As is clear from the above, in the present embodiment, the wire extending from one end of the guide tube (40) to the operating portion (head cover (36)) of the gas spring (12) for adjusting the tilt angle of the backrest ( 41) is provided with a guide portion (42b) having an arcuate guide surface (42c) that slidably guides the actuator lever (38) in the moving direction, so that one end of the guide tube (40) is provided. The gas spring (12) can be attached to the operating part of the gas spring (12) in the direction crossing the moving direction of the operating lever (38). The lever (56) can be connected to the short guide tube (40) and the wire (41) so as to be able to operate smoothly without greatly bending them.

In the above embodiment, the guide part (42b) is provided in the operation part of the gas spring (12). However, as shown in FIG. 15, the bent piece is a fastening part for fastening the other end of the tube (40). (42a) and a bracket (42) having a guide part (42b) having an arcuate guide surface (42c) are fixed to the inner end surface of the box (58) for pivoting the operation bar (56), By guiding the wire (41) extending from the other end of the tube (40) with the guide portion (42b), the other end of the tube (40) is bent in the left-right direction which is the rotation direction of the operation bar (56). May be fixed to the bent piece (42a) so as to extend toward the front where there is a connecting portion between one end of the gas spring (12) and the operating portion (head cover (36)).
In addition, the bracket (42) may be provided on both the operation part of the gas spring (12) and the box (58) for pivoting the operation bar (56).

Furthermore, in the above embodiment, the moving direction of the operating lever (71) in the operating portion of the gas spring (4) for adjusting the seat height and the moving direction of the operating lever (56) are the same direction and they are Since the tubes (66) need only be arranged in a straight line that faces in the same direction as their movement direction, the movement direction of the operation lever (71) and the operation lever (56) When the moving direction is different or the arrangement in the front-rear direction is shifted, the present invention is applied, and the guide portion (42b) described above is provided on either or both of them, and the tube (66 ) May be directed in a desired direction convenient for connection.
In this case, the stationary part to which each end of the gas spring (4) is coupled is the leg (3), and the movable part is the support base (6).

In addition, the present invention can be implemented in many different forms without departing from the scope of the present invention.
For example, the guide portion (42b) is directly fixed to the outer surface of the head cover (36) of the gas spring (12) or the box (58) for pivoting the operation bar (56), or formed integrally. May be.
In addition, the operation levers (38) and (71) and the operation lever (56) may be not only a rotating type but also a sliding type that linearly moves.

It is a front view of a chair provided with one embodiment of the present invention. Similarly, it is a side view. Similarly, it is an exploded perspective view of a main member. Similarly, it is an enlarged side view of the main part when the backrest is in the standing position. Similarly, it is an enlarged side view of the main part when the backrest is tilted backward. Similarly, it is the fragmentary top view which follows the VI-VI line of FIG. Similarly, it is an exploded perspective view of the tilting device of the backrest. Similarly, it is a central longitudinal side view of the support base. Similarly, it is a longitudinal cross-sectional front view along the IX-IX line of FIG. Similarly, it is a longitudinal side view along the line XX in FIG. Similarly, it is a cross-sectional plan view which follows the XI-XI line of FIG. Similarly, it is the XII-XII arrow line view of FIG. Similarly, it is an expanded sectional view which follows the XIII-XIII line of FIG. Similarly, it is an enlarged vertical front view along the XIV-XIV line of FIG. It is an expansion cross-sectional top view of the attachment part of the operation lever in other embodiment of this invention.

(A) Energizing means
(B) Rotating biasing means
(C) Force adjusting means
(D) Gas spring unit
(1) Casters
(2) Legs
(3) Leg
(4) Gas spring
(5) Pillar
(6) Support base (non-moving part)
(6a) Support base
(6b) Arm
(6c) Semi-cylindrical part
(7) Top cover
(8) Axis (core material)
(8a) Square shaft
(9) Backrest
(9a) Backrest frame
(9b) Upholstery material
(10) Back support
(10a) Tube part
(10b) Projection
(11) Rubber torsion spring
(12) Gas spring
(12a) Push valve
(13) Bottom cover
(14) Seat
(14a) Seat frame
(14b) Upholstery material
(15) Seat support frame
(16) axis
(17) Inclined surface
(18) Standing wall
(19) Inclined bearing surface
(20) Stop prevention means
(21) Long hole
(22) Headed shaft
(22a) Expanded head
(23) Opening
(24) Empty space
(25) Armrest
(26) Arm (movable part)
(27) Outer cylinder
(28) Elastic body
(29) Bearing
(29a) Projection
(30) Set screw
(31) (32) Recess
(33) (34) Notch
(35) axis
(36) Head cover (operation unit)
(37) axis
(38) Actuating lever (actuating member)
(38a) shaft
(39) Wire unit
(40) Guide tube
(41) Wire
(42) Bracket
(42a) Guide part
(43) Forward thread
(44) Reverse thread
(45) Operation handle
(46) Operation axis
(47) (48) Female thread hole
(49) (50) Moving piece
(51) axis
(52) Linkage
(52a) Base piece
(52b) Side projection
(53) axis
(54) (55) Link
(56) Control lever
(57) Window hole
(58) Box
(59) axis
(60) Buttocks
(61) (62) Elastic engagement claw
(63) Tube mounting piece
(64) Wire unit
(65) Wire
(66) Tube
(67) Circular hole
(68) Control case
(69) Tube mounting piece
(70) axis
(71) Actuating lever
(71a) Upward arm
(71b) Lateral arm

Claims (3)

When each end is connected to the non-moving part and the movable part of the chair and the push valve is located at the non-operation position, the movement of the movable part is disabled and the push valve is pushed to the operation position. The operating member that pushes the push valve in the gas spring that enables the movable portion to move and the operating lever provided at an appropriate position of the chair are connected by a wire, and the wire is slid in the axial direction. One end of the flexible guide tube inserted so as to be movable is fixed to the gas spring operation part in the vicinity of the operating member, and the other end of the guide tube is placed in a proper position in the chair in the vicinity of the operation lever. In the gas spring operating device in the chair that has been fastened,
One end of the guide tube is directed in a direction that is different from the moving direction of the operating member or the operating lever and that is convenient for connection between the other end of the guide tube and the operating lever side or the operating member side. The gas spring operation part or the fixing lever provided in the bracket attached to the appropriate position of the chair in the vicinity of the operation lever is fixed to a fixing part, and the wire extending from one end of the guide tube is attached to the bracket . gas spring operating device in a chair, wherein the actuating member or the arc-shaped guide portion gutter groove-shaped guide surface formed on the arcuate surface slidably guiding the warp to the direction of movement of the operating lever digits set . The arm that turns the gas spring in the front-rear direction, connects one end to the front part of the support base, and rotates the other end in the front-rear direction together with the backrest pivotally attached to the support base The wire extending from one end of the guide tube fixed to the gas spring operation part so as to face the direction substantially perpendicular to the longitudinal direction of the gas spring is connected to the tip of the gas spring, and the longitudinal direction of the gas spring is substantially adjusted by the guide part. deflect as directed, the one end of the wire, the gas spring control device according claim 1 Symbol placement chair was fixed to the actuating member so as to move in the longitudinal direction of the gas spring. The operation lever is pivotally attached to the appropriate position on the outer surface of the chair with an axis facing the front-rear direction, and one end of the guide tube extends forward, and is fixed to the appropriate position on the chair near the operation lever. The gas spring operation in the chair according to claim 1 or 2 , wherein a wire extending from one end of the guide tube is warped by the guide portion so as to substantially face the rotation direction of the operation lever, and one end of the wire is fixed to the operation lever. apparatus.

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