JP4778215B2 - Reclining chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining chair for which the pivot of a backrest support rod supporting a backrest and an energizing means for the backrest, etc., can be easily and surely assembled to a support base in a short time. <P>SOLUTION: An energizing means A for energizing the backrest in an erecting direction is provided with a turning energizing means B having a rubber torsion spring 11 composed by turning the pivot 8 to be turned integrally with the backrest to a core material and filling an elastic body 28 between an outer cylinder 27 detained to the support base 6 concentrically and the pivot 8. Moreover, the support base 6 is turned to a vertically bisected structure composed of a support base main body 6a and a lower cover 13 attached to the lower surface and the turning energizing means B, the pivot 8 and bearings 29 supporting it are housed between them. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a reclining chair in which a backrest tilts backward, and more particularly to a structure of a portion of a support base thereof.

As a conventional reclining chair of this type, the present inventor has provided a so-called rubber torsion spring as a biasing means for biasing the backrest toward the standing position (see, for example, Patent Document 1). .
This device pivotally supports a hexagonal shaft facing in the left-right direction on a support supported by legs, and the front lower end of a pair of left and right backrest support rods that support the backrest at both ends of the shaft. The urging means for urging the backrest toward the upright position is composed of a core material having a hexagonal hole through which the shaft penetrates in the center and a concentricity with the core material. The outer cylinder disposed between the core and the outer cylinder is filled, and the core is rotated around the central axis with respect to the outer cylinder together with the shaft, so that it is elastically deformed to the pivot. It is composed of a plurality of unit urging means having an elastic body to which the return turning force is applied.
JP 2004-49717 A

  However, in the conventional reclining chair as described above, after accommodating a plurality of unit urging means consisting of rubber torsion springs in the support base, a hexagonal shaft is inserted from the side of the support base into the core material in each rubber torsion spring. The end of a pair of left and right backrest supporting rods that support the backrest must be fixed to both ends of the shaft, and the assembling work, particularly the hexagonal shaft There is a problem in that it takes time to assemble the rubber torsion springs in a complicated manner in which the rubber torsion springs are sequentially inserted into the hexagonal holes of the core.

  In view of the above-described problems of the prior art, the present invention provides a pivot for supporting the backrest, the urging means for the backrest, etc. in a simple manner in a short time. In addition, an object of the present invention is to provide a reclining chair that can be reliably assembled.

According to the present invention, the above problem is solved as follows.
(1) The front end of the lower portion of the backrest supporting rod that supports the backrest is fixed to the left and right pivots that are supported by the legs and pivotally supported by the support base that supports the seat, and the backrest is fixed. In a reclining chair in which the support rod is urged by the urging means provided on the support base in the direction in which the backrest stands upright, the urging means rotates around the support base with the pivot as a core material. By filling an elastic body between the stopped outer cylinder and the pivot, the pivot rotates about the central axis with respect to the outer cylinder, so that the elastic body is elastically deformed, and the pivot An upper and lower divided structure comprising a rotation urging means having a rubber torsion spring for applying a return turning force, and comprising the support base and a cover attached to the lower surface or the upper surface thereof. and, the supporting It mounted as slidable in the longitudinal direction in the body, and one end is the other end of the connecting rod coupled to the biasing force adjusting means provided on said support base body, and connecting the outer tube in the rubber torsion spring, the supporting A bearing for loosely fitting the turning urging means in a recess formed in a facing portion between the basic body and the cover, and supporting the pivot shaft projecting on both sides of the turning urging means and the support basic body. The both sides of the pivot that is held by the cover and protrudes further outward than the bearing are inserted into notches provided at opposite edges of the both sides of the support basic body and the cover.

(2) In the above item (1) , the front end portion of the lower portion facing forward in the backrest supporting rod as a pair of left and right is fixed to both end portions of the pivot that protrudes outward from the support base.

(3) In the above item (1) or (2) , a pair of left and right rubber torsion springs are provided near the center of the pivot, and a corresponding pair of left and right covers are provided between the rubber base and the support base. A torsion spring and a bearing for supporting the pivot projecting outwardly are attached to the support base body.

(4) In any one of the above items (1) to (3) , an arm that faces in a direction perpendicular to the pivot is provided on the pivot, and an operation knob provided at one end is operated at the tip and support of the arm. Each end of the gas spring, which can be expanded and contracted by moving to a position and cannot be expanded and contracted by returning the operation knob to the inoperative position, is connected.

(5) In the item (4) subordinate to the above item (3) , the arm spring is provided in a substantially central part of the pivot so as to face downward, and a gas spring having one end connected to the lower end thereof is directed forward and upward, and The other end of the gas spring is connected to the front center of the support base.

According to the present invention, the following effects can be achieved.
(1) According to the first aspect of the present invention, in the state in which the rotation urging means having the rubber torsion spring, the pivot shaft of the backrest supporting rod and the bearing fitted on it are integrally assembled together, By simply sandwiching the cover between the top and bottom and fixing the cover to the support basic body, it is possible to assemble them easily, quickly and reliably on the support base.

(2) In addition, by sandwiching the the supporting base body and the cover a bearing, it is possible to support the pivot stably, moreover, biasing means pivot is formed on the portion facing the support base body and the cover Since it is loosely fitted in the concave portion, there is no possibility that extra stress is applied to the pivot from the outer cylinder side due to an attachment error or the like when the outer cylinder is fixed to the support base. Further, since it is possible to rotate the outer cylinder with respect to the support base, an initial biasing force on the pivot is provided by providing an adjusting means (a configuration other than the present invention) for adjusting the detent position around the pivot of the outer cylinder. Can be adjusted.

(3) According to the invention described in claim 2 , the backrest can be stably supported by the pair of left and right backrest support rods, and the left and right backrest support rods are fixed to both ends of the pivot in advance. Thus, it can be attached to the support base by sandwiching it between the support basic body and the cover together with the rotation urging means mounted on the intermediate portion of the pivot, and the assembly workability is good.

(4) According to the invention described in claim 3 , the two rubber torsion springs and the pivot which is the common core of them are united as a single unit, in a well-balanced manner, easily, in a short time and reliably. Can be assembled.

(5) According to the invention described in claim 4 , the backrest can be stopped steplessly at an arbitrary inclination angle by the gas spring, and when the operation knob of the gas spring is set to the operating position, the gas spring Since the urging force of the rotation urging means can be assisted by this urging force, the rotation urging means can be made small with a small urging force.

(6) According to the invention described in claim 5 , since the arm portion for connecting the gas spring is provided at substantially the center of the pivot and a pair of left and right rubber torsion springs are disposed on both sides thereof, Good balance and good balance in appearance.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
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, short upright arms (10b) and (10b) project upwardly at a portion slightly behind the pivot (8) in the left and right backrest support rods (10) and (10). The rear ends of a pair of left and right seat support frames (15) and (15) that support both sides of the seat (14) are located at the upper end of each standing arm (10b). Each is connected with a shaft (16) pointing in the 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 seat frame (14a) having a substantially rectangular frame shape in plan view, and a stretchable sheet material made of, for example, a mesh fabric using stretchable fibers, a plain woven fabric, a synthetic resin film, or the like. (14b) is formed by stretching, and when the seated person is seated, the seat material (14b) is extended, and the seat surface center part is recessed downward along the seated person's buttocks, 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) is supported by lifting up the four corners of the seat frame (14a) higher than the support base (6) by the standing arms (10b) and (10b). 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 sheet material (9b) made of the same material as the above-mentioned sheet 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.
In the case where the front / rear position adjustment of the seat (14) is not performed, the rear portion of the seat (14) is directly supported by the upright arms (10b) (10b) on the left and right back support rods (10) (10) with the shaft (16). 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 part (6c) that faces in the left-right direction and has an open bottom surface is formed as a part of the support basic body (6a) at the lower center of the support basic body (6a). A pair of left and right lower covers (13) and (13) that are formed in a semi-cylindrical shape that faces in the left-right direction and has an upper surface open 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) that hangs down between the left and right lower covers (13) (13), the rear lower end of the gas spring (12) that faces front and upward is a shaft (35 ).
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).
When the operating knob (38) 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, and expands and contracts. In addition, it is a publicly known device in which expansion and contraction becomes impossible when the operation knob (38) is returned to the inoperative position.

  In the head cover (36), a flexible outer tube (40) is attached to the operation lever (39) facing outwardly pivotally attached to the middle part of the upright arm (10b) of the right back support rod (10). ) Is provided with an operating lever (42) connected through a wire (41) inserted through the inside, and by pulling the operating lever (39) upward and outward, the operating lever (42) is moved to the operating knob (38). When the operating lever (39) is released, the operating lever (42) and the operating lever (39) are moved back to their original position by the return force of the operating knob (38) to the inoperative position. It can be returned to the operating position. The operating lever (39) may be provided with a spring (not shown) for returning to the inoperative position. One end of the outer tube (40) is fixed to the inner surface of the upright arm (10b) of the backrest supporting rod (10), and the other end is fixed to the head cover (36), and the wire (41) is inserted therethrough. Smoothly moves in the axial direction.

  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 operation knob (38) is located at the operating position, and the operation knob (38) 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 basic 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 upright arm (10b) of the left backrest support heel (10) has an operation lever (39) provided in the middle part of the upright arm (10b) of the right backrest support heel (10). A similar operation lever (56) is mounted so as to be rotatable about an axis line in the front-rear direction.
The operating lever (56) is connected to a gas spring (4) of a pedestal (5) provided at the rear of the support base (6) via a wire (58) inserted through the flexible outer tube (57). It is connected to an operating lever (not shown) for operation, and by rotating the operating lever (56) outward and upward, the operating knob (not shown) of the gas spring (4) is pushed to the operating position to The column (5) can be freely expanded and contracted, and the operation lever (56) is rotated back and forth to return the operation knob (not shown) of the gas spring (4) to the inoperative position. The pedestal (5) can be stopped steplessly in the expanded and contracted state at that time.

  As is apparent from the above, according to this embodiment, the rotation urging means (B) having the rubber torsion spring (11), the pivot (8) of the backrest supporting rod (10), and the bearing (29 ) In a state where they are integrally assembled with each other, they are sandwiched from above and below by the support basic body (6a) and the lower cover (13), and the lower cover (13) is fixed to the support basic body (6a). Can be easily and securely assembled to the support base (6) in a short time.

It should be noted that the present invention can be implemented in many different forms without departing from the scope of the present invention.
For example, the support base (6) has a vertically split structure consisting of a support basic body (6a) and a cover (not shown) attached to the upper surface of the support base (6a). In the formed recess, the rotation urging means (B) and the bearings (27) and (27) for supporting the pivot shaft (8) projecting on both sides thereof are accommodated. From the bearings (27) and (27), Further, both side portions of the pivot shaft (8) protruding outward may be inserted into notches (not shown) provided at opposite edges of both side surfaces of the support basic body (6a) and the cover.
Further, the rotation urging means (B) has a single rubber torsion spring integrated with the pivot (8), or three or more having a single pivot (8) as a common core. It is possible to have a rubber torsion spring.
Furthermore, the cross-sectional shape of the entire pivot (8) may be a regular hexagon or other non-circular shape.

It is a front view of the chair which is 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.

(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) pedestal
(6) Support base
(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) Sheet material
(10) Back support
(10a) Tube part
(10b) Standing arm
(11) Rubber torsion spring
(12) Gas spring
(13) Bottom cover
(14) Seat
(14a) Seat frame
(14b) Sheet 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
(27) Outer cylinder
(28) Elastic body
(29) Bearing
(29a) Projection
(30) Set screw
(31) (32) Recess
(33) (34) Notch
(35) axis
(36) Head cover
(37) axis
(38) Operation knob
(39) Control lever
(40) Outer tube
(41) Wire
(42) Actuation lever
(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) links
(56) Control lever
(57) Outer tube
(58) Wire

Claims (5)

The front end of the lower portion of the backrest support rod that supports the backrest is fixed to the left and right pivots that are supported by the legs and pivotally supported by the support base that supports the seat, and the backrest support rod is In the reclining chair urged toward the direction in which the backrest stands by the urging means provided on the support base,
The urging means has a central axis line with respect to the outer cylinder by filling the elastic body between the pivot and the outer cylinder that is concentric with the pivot and is supported by the support base. The elastic body is elastically deformed by rotating around, and is provided with a rotation urging means having a rubber torsion spring adapted to give a return turning force to the pivot, and the support base, A bifurcated structure comprising a support basic body and a cover attached to the lower surface or the upper surface of the support basic body, mounted on the support basic body so as to be slidable in the front-rear direction, and having one end provided on the support basic body An outer cylinder of the rubber torsion spring is connected to the other end of the connecting rod connected to the means, and the rotation urging means is loosely fitted in a recess formed in a facing portion between the support basic body and the cover. , wherein the rotation urging means A bearing for supporting said pivot protruding on both sides and sandwiched by said support base body and the cover, the side portions of the pivot that protrudes further outward than the bearing, opposite sides of said support base body and the cover A reclining chair characterized by being inserted through a notch on the edge. The both ends of the pivot projecting outward from the support base, left and right pair and the backrest and fixed to the front end portion of the lower facing forward in supporting rod according to claim 1 Symbol placement reclining chair. A pair of left and right rubber torsion springs are provided near the center of the pivot, and a pair of left and right covers corresponding thereto are supported between the rubber torsion springs and the pivots projecting outwardly between the rubber torsion springs. according to claim 1 or 2 recliner chair mounted on support base body so as to accommodate a bearing. An arm that faces in the direction orthogonal to the pivot is provided, and the operation knob provided at one end can be moved to the operating position on the tip and support base of this arm so that it can be expanded and contracted. The reclining chair according to any one of claims 1 to 3 , wherein the end portions of the gas spring, which are made inextensible and retractable by being returned to the position, are connected. The arm part is provided in a substantially central part of the pivot downwardly, a gas spring having one end connected to the lower end thereof is directed front-upward, and the other end of the gas spring is connected to the front center of the support base. The reclining chair according to claim 4, which is dependent on 3 .

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