JP4750535B2 - Backrest locking device in reclining chair - Google Patents

Description

  The present invention locks the tilt of the backrest attached to the backrest support rod that is supported by being supported by being supported by the support base in the front-rear direction and is biased forward, and releases the lock. The present invention relates to a backrest locking device for a reclining chair.

A locking device that can lock the tilting of the backrest and release the locking by the turning operation of the handle is described in, for example, Patent Document 1 and is well known.
Japanese Utility Model Publication No. 50-15765

  In the backrest locking device described in the above-mentioned patent document, a backrest support saddle (backrest) mounting body is provided on a support base (seat mounting body), and an engaging portion provided on the mounting body is simply a handle. By the forward / reverse operation, the tilting of the backrest is locked or unlocked by engaging / disengaging with the stopper attached to the support base.

  For this reason, even when the back is pressed against the backrest, the lock may be released. If the handle is operated carelessly, the backrest may suddenly tilt backward, which may cause discomfort to the seated person. .

  The present invention has been made in view of the above problems, and when a load is applied to the backrest, it cannot be locked or unlocked, and the backrest tilts backward rapidly. An object of the present invention is to provide a backrest locking device for a reclining chair that can prevent the above-described problem.

According to the present invention, the above problem is solved as follows.
(1) On the support base provided at the upper end of the leg body, the pivot portion facing the left-right direction at the lower end of the backrest support rod facing up and down is backrested against the forward biasing means provided on the support base. A backrest locking device for a reclining chair that is pivotally attached so that the support rod can be rotated backward and locks or releases the tilt of the backrest attached to the backrest support rod. A front-end stopper step portion and a rear-end stopper step that regulate the maximum tilting amount of the backrest in the front-rear direction by abutting the front and rear upper surfaces of the support base on the outer peripheral surface of the pivot portion of the support shaft. And a rear opening between the rear limit stopper step portion formed when the front limit stopper step portion contacts the front upper surface of the support base and the rear upper surface of the support base. A locking member that can be engaged and disengaged in the gap can be moved in the front-rear direction behind the gap. The lock member is locked when the operation handle is not operated, by engaging the rear end of the elastic member in the shape of a convex arc that is provided in the front side and linked to the operation handle. Biasing is carried out backward from the gap, and the lock member is moved forward and engaged with the gap when the operation handle is operated.

(2) In the above item (1), the front limit stopper step portion, the rear limit stopper step portion, the lock member, and the elastic member are provided in pairs of left and right.

(3) In the above item (1) or (2), the elastic member is a wire-like operating spring.

(4) In any one of the above items (1) to (3), the lock member has a wedge shape in which the vertical dimension gradually decreases toward the front, and the gap has a wedge shape that allows the lock member to be engaged and disengaged. To do.

(5) In any one of the above items (1) to (4), the lock member is placed on the rear upper surface of the support base and is slid in the front-rear direction by the guide means provided on the stationary member on the upper surface of the support base. Guide to move.

(6) In any one of the above items (1) to (5), an arcuate recess is formed on the upper surface of the support base to accommodate the substantially lower half of the pivot part, and the front and rear of the support base sandwiching the recess The lower end of the front limit stopper stepped portion and the lower end of the rear limit stopper stepped portion are in contact with the upper surface.

(7) In the above items (1) to (6), the elastic member is curved in an upward convex arc shape so as to straddle the upper surface of the pivot portion.

  According to the first aspect of the present invention, unless the back is separated from the backrest and the backrest is tilted to the front limit, the lock member is engaged in the gap formed between the stopper step for the rear limit and the support base. When the back pressing load is applied to the backrest, the lock member engaged in the gap is strongly pressed by the stopper step for the rear limit. Even when operated in the unlocking direction, the locking member cannot be separated from the gap only by the urging force of the elastic member.

  Therefore, when locking the backrest or unlocking it, it is necessary to move the back away from the backrest, and even if the operating handle is inadvertently operated, the backrest is locked against the backrest. Is not released, and the backrest is prevented from abruptly leaning backward.

  According to the invention described in claim 2, since the backrest is locked from the left and right balance, even if the backrest is strongly applied to the backrest, both side portions thereof do not wobble in the front-rear direction.

  According to the third aspect of the present invention, the production and assembly work of the elastic member can be facilitated, and the left and right dimensions can be made smaller than those of the leaf spring or the like.

  According to the fourth aspect of the present invention, the lock member can easily enter the gap, and the lock member can be reliably engaged with the gap, and a gap is generated between the lock member and the rear limit stopper step. This prevents the backrest from shaking in the front-rear direction when locked.

  According to the fifth aspect of the present invention, since the lock member only needs to be placed on the upper surface of the support base, it is easy to assemble and can be reliably moved in the front-rear direction by the guide means.

  According to the sixth aspect of the invention, since the vertical dimension of the support base is reduced, the appearance is improved, and it is not necessary to separately provide an abutting member with which the front and rear limit stopper steps contact. The number of points and assembly man-hours are reduced.

  According to the seventh aspect of the invention, since the elastic member is curved in an arc shape so as to straddle the upper surface of the pivot portion, the vertical dimension of the elastic member from the upper surface of the support base is reduced, and the upper surface of the support base is reduced. Since the vertical dimension of the entire support base including the cover attached to the frame is also reduced, the appearance is further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a reclining chair to which the present invention is applied, FIG. 2 is a side view of the same, and FIG. 3 is an exploded perspective view of the main part.

  The chair (1) is composed of a leg (4) having five leg rods (3) facing the radial direction with a caster (2) attached to the tip, and a gas which is erected at the center and contained in the leg. A leg column (5) that can be expanded and contracted by a spring (not shown) and a support base (6) fixed to the upper end of the leg column (5) are provided.

  At the front end of the support base (6), a seat support frame (7) having a frame shape in plan view that extends obliquely upward and obliquely outward is integrally provided, and the support base (6 As shown in FIG. 3 (only one is shown because it is bilaterally symmetrical) on both side portions slightly behind the pedestal (5) in FIG. A pair of left and right backrest support rods (8) and (8) bent in an inward L shape are provided with a pivot portion (8a) at the inner end of the inward bent portion inside the support base (6). By being connected to a rubber torsion unit (53) which will be described later, it is attached so as to be able to turn in the front-rear direction in a state where a forward biasing force is applied.

  As shown in FIG. 4, a pair of guide members (9) having outwardly U-shaped guide grooves (9a) (9a) on the left and right side surfaces on the upper surfaces of the left and right front ends of the seat support frame (7). (9) is fixed by bolts (10), and both guide members (9) are seat plates (13) made of a synthetic resin material in which a cushion material (12) is stretched on the upper surface of the seat body (11). A pair of slide members (14) facing the front-rear direction integrally formed on the lower surfaces of both side portions of the front end portion of the front end portion of the front end face toward the front-rear direction of the lower surface of the guide groove (9a). By being slidably fitted to each other, it is supported to be movable in the front-rear direction.

  As will be described later, the seat body (11) moves so as to incline backward and downward, so that it does not interfere with it, between the guide groove (9a) and the slide groove (14a). The required gap is provided.

  The rear end of the seat plate (13) in the seat body (11) is rotatably supported by the left and right back support rods (8) as follows.

  As shown in the exploded perspective view of FIG. 3 and the enlarged vertical sectional view of FIG. 5 (only one is shown for left-right symmetry), the left and right sides of the rear end of the seat plate (13) are opened inside and downward. A pair of upward projections (16) having an upward concave hole (15) is integrally erected, and the outer surface of the outer side piece (16a) has a vertical direction with an upper end opened. An inward concave fitting groove (17) is formed.

  The fitting groove (17) has a lower end portion of a metal plate-like seat support bracket (18) that complements the fitting groove (17), and two upper and lower through holes (19) formed in the side piece (16a). The bolt (20) is inserted from the outside into the through hole (22) of the fixing plate (21) made of hard synthetic resin inserted from below into the concave hole (15). The upper end protrudes upward from the upper end of the upward projection (16) by screwing into a nut (24) fitted in a hexagonal recess (23) formed on the inner surface. It is fixed in the state.

  The upward projection (16) and the seat support bracket (18) constitute a support piece (25) that supports the rear end of the seat (11) (see FIGS. 1 and 2).

  The lower end of the fixing plate (21) is in contact with the lower surface of the outer side piece (16a) of the upward projection (16), and the lower end of the recessed hole (15) is connected to the lower end of the seat plate (13). A closing piece (21a) that is well-dressed to be continuous with the lower surface is integrally provided continuously.

  (26) is a synthetic resin cover that covers the outer surface of the seat support bracket (18) and the head of the bolt (20). The shaft-shaped protrusion (26a) projecting from the inner surface of the cover is made of a seat support bracket. By being fitted in the mounting hole (27) between the upper and lower through holes (19) in (18), it is fixed so as to be fitted in the fitting groove (17).

  A support cylinder (28) facing in the left-right direction and closed on the inner surface is provided at the upper end of the backrest support rod (8) positioned above the upper surface of the rear end of the seat (11). The projecting shaft (28a) is fixed to the backrest support rod (8) by fitting and welding it. On the inner surface of the support tube (28), the support shaft (29) and the square shaft (30) are integrally projected so as to be coaxial, and the support shaft (29) is provided on the seat plate (13). The fixed seat support bracket (18) pivots vertically by pivotally fitting a circular hole (31) drilled in its upper end via a pair of left and right hooked bushes (32) (32) Supported as possible.

  The outer peripheral surface excluding the lower portion of the seat support bracket (18) has a shape that matches the outer peripheral surface of the support tube (28), thereby preventing a step between them.

  The angular axis (30) is formed on the outer surface of a shaft-like back support member (33) having the same outer diameter as the support cylinder (28), and a rectangular hole (30) is complementary to the angular axis (30). 34), and the bolt (35) inserted from the outside into the support tube (28) passes through the through hole (36) of the support shaft (29) and the square shaft (30) to support the backrest. The support tube (28) and the backrest support member (33) are formed between the facing surfaces of the support tube (28) and the back support member (33) by being screwed into the screw (37) to be formed on the back surface of the square hole (34) in the member (33). The left and right hooked bushes (32) and the upper end of the seat support bracket (18) are fixed to each other so as to be sandwiched in a rotatable manner.

(38) is a cap fastened to the opening on the outer surface of the support tube (28).
On the upper surface of the backrest supporting member (33), a square-axis-shaped back frame mounting rod (39) is erected.

  The backrest (40) is composed of a substantially square frame-like back frame (41) and an inner back plate (42) surrounded by the back frame (42). ing. The lower part of the left and right side frames (41a) and (41a) in the back frame (41) is slightly expanded outward, and the attachment portion (41b) to the backrest support rod (8) is directed downward at the lower end. It is connected to.

  On the entire surface of the back plate (42), a number of vertically slit-like openings (43) are perforated in a regular arrangement at regular intervals in the vertical and horizontal directions, and when the seated person's back is pressed against it, the vertical direction The back plate (42) as a whole bends backward with the opening (43) lined up in the center.

Further, the thickness of the back (41) and the back plate (42) is thicker on the lower side, and gradually becomes thinner toward the upper side, so that the upper side is more easily bent backward.
Further, the thickness of the back plate (42) is thick at the left and right sides, and gradually becomes thinner toward the center, and the center is more easily bent backward.

  As shown in FIG. 5, a rectangular cross section having an opening at the lower end is formed on the attachment portion (41 b) at the lower end portion of the side frame (41 a) of the back frame (41), which is complementary to the back frame attachment rod (39). The mounting hole (44) is formed in the vertical direction.

  After the back frame mounting rod (39) is properly fitted into the mounting hole (44), as shown in FIG. 3, the concave groove (45) formed on the outer surface of the side frame (41a) and facing in the vertical direction. The lower mounting portion (46a) connected to the rear end of the armrest (46) is fitted to the lower end portion of the armrest, and the upper and lower two holes drilled in the back surface of the concave groove (47) on the outer side surface thereof. Insert the bolt (49) inserted into the through hole (48) through the two upper and lower through holes (50) on the back surface of the concave groove (45) in the side frame (41a), and insert it into the mounting hole (44). The fitted back frame mounting rod (39) is screwed into two upper and lower female screw holes (51) facing in the left-right direction and tightened.

  Accordingly, the back frame mounting rod (39) which is substantially integrated with the back support rod (8), the back frame (41) in the back frame (40), and the armrest (46) are two bolts. Tightened together by (49).

  It should be noted that the lower end of the downward mounting portion (46a) of the armrest (46) and the lower end of the side frame (41a) are respectively provided on the upper surface of the support tube (28) at the upper end of the backrest support rod (8) and the backrest support member. An upward arc-shaped fitting recess (52) (52) to be fitted to the upper surface of (33) is formed so as to improve the appearance after the attachment.

  When the backrest (40) tilts backward about the pivot (8a) of the backrest support collar (8) that supports it, the lower surface of the front end is supported by the support base (6) so that it can move in the front-rear direction. And a rear end portion of which is supported by a support shaft (29) facing the left-right direction of the support tube (28) fixed to the upper end of the backrest support rod (8) via a seat support bracket (18). The body (11) moves backward such that its rear end portion is inclined downward and downward.

  At this time, the rear end portion of the seat body (11) is pivotally attached to the support shaft (29) at the upper end of the backrest support rod (8) in an upper part separated from the upper surface thereof. Since it is away from the pivot (8a), which is the center of rotation of the backrest support rod (8), the amount of backward rotation of the backrest support rod (8), that is, the back tilt amount of the backrest (40) The amount of rearward and downward movement of the seat body (11) can be increased, and the sitting comfort is improved.

  As shown in FIGS. 6 to 11, a rubber torsion unit that urges the backrest support rod (8) and the backrest (40) attached thereto forwardly as shown in FIGS. (53) is provided.

  The rubber torsion unit (53) consists of an inner cylinder (54) facing left and right, an outer cylinder (55) having a larger diameter and shorter than that, and an inner cylinder (54) and an outer cylinder (55). It consists of a torsion rubber (56), which are firmly fixed to each other and integrally formed.

  The lower surface of the outer cylinder (55) and the torsion rubber (56) are fitted to a projecting portion (58) having a square cross-section projecting upward from the bottom surface of the recessed portion (57) formed in the center of the upper surface of the support base (6). Thus, the rotation of the support base (6) and the movement in the front-rear and left-right directions are prevented.

  At both left and right end portions of the inner cylinder (54), cylindrical pivot portions (8a) fixed by welding to the inner ends of the inwardly bent portions at the lower ends of the left and right back support rods (8) are externally fitted. These pins are connected so as not to rotate relative to each other by pins (59) that are press-fitted so as to penetrate the centers thereof vertically. As a result, the right and left back support rods (8) are given a biasing force by the torsional resistance generated when the inner cylinder (54) elastically deforms the torsion rubber (56) in the circumferential direction.

  The rubber torsion unit (53) is assembled in a state where an initial urging force is applied to the inner cylinder (54) so that the backrest support ridge (8) is always urged forward.

  As shown in FIG. 9, a bush (60) is fitted to the left and right pivot portions (8a), and the lower half of the bush (60) is formed on the upper surface of the support base (6). Fits into the circular recess (61) and the upper half fits into the lower surface of the fixture (63) fastened with the bolt (62) to the upper surface of the support base (6) sandwiching the groove (61) Thus, the pivot portion (8a) is rotatably held.

  Reference numeral (64) denotes a cover that comfortably covers the rubber torsion unit (53), the fixture (62), and the like, fixed to the upper surface of the support base (6).

  As shown in FIG. 11, a flange plate (65) having a substantially semicircular shape in a side view is integrally formed on the upper half of the outer peripheral surface of the pivot portion (8a) in the left and right back support rods (8). A notch (66) having a concave shape in side view for insertion of the pin (59) is formed at the center in the circumferential direction.

  The front end stopper step (65a) of the flange plate (65) is fixed with a bolt (68) in a recess (67) on the front upper surface of the support base (6). It is always in contact with the upper surface of the contact member (69) aligned with the substantially same surface as the upper surface. At the time of this contact, the rear limit stopper step portion (65b) of the flange plate (65) is slightly separated from the contact portion (70) on the upper surface of the rear portion of the support base (6). A wedge-shaped gap (S) opening rearward is formed.

  When the front limit stopper step (65a) of the flange plate (65) comes into contact with the front contact member (69), the backrest (40) tilts forward to the maximum, and the rear limit stopper step When the part (65b) comes into contact with the rear contact part (70), the maximum amount of backward tilting of the backrest (40) is regulated.

  As shown in FIGS. 6, 10, and 11, the upper half of the support base (6) behind the left and right flange plates (65) has a front half that can be inserted into the wedge-shaped gap (S). The lock portion (71) having a shape is formed with a guide groove (72) facing the front-rear direction formed on the upper surface of the rear half thereof, and a downward guide piece (73) projecting on the inner surface of the rear end portion of the fixture (63) It is mounted so that it can slide to the front-back direction by fitting to the lower end part.

  The inner side surfaces of the left and right lock members (71) are fitted with outwardly bent pieces (74a) at the rear end of a wire-like actuating spring (74) that curves upward in a convex arc shape. It is prevented from coming off by a projecting piece (75) provided on the upper surface of the base (6).

  The inwardly bent piece (74b) at the front end of the actuating spring (74) protrudes greatly to the left side of the support base (6) rotatably held through the front end portions of the left and right fixtures (63). It is fitted to a pair of long rotating plates (77) that are fixed to the operating rod (76).

  The actuating spring (74) urges the lock member (71) to the rear always away from the gap (S), and also slightly urges the rotating plate (77) to always face upward. It is attached in a bent state.

  (78) is a handle operating handle attached to the left protruding end of the operating rod (76).

  The back plate (40) is locked by the flange plate (65), stopper piece (69), lock member (71), operating spring (74), operating rod (76), rotating plate (77), etc. Is configured.

  When the operating handle (78) is not operated, as shown in FIG. 11, the lock member (71) is moved to the rear of the gap (S) by the biasing force of the operating spring (74). The front limit stopper step (65a) and the rear limit stopper step (65b) of the flange plate (65) are in contact with the front contact member (69) and the rear contact portion (70), respectively. Within range, the backrest (40) can be reclined in the front-rear direction.

  When the handle (78) is operated downward and the operating rod (76) and the rotating plate (77) fixed thereto are turned counterclockwise when viewed from the side, as shown in FIG. 12, the operating spring (74) opens outward. By being pulled forward while being elastically deformed, the lock member (71) attached to the rear end is also moved forward. At this time, if the backrest (40) is tilted backward, the gap (S) between the rear limit stopper step (65b) of the flange plate (65) and the contact portion (70) is closed, Since the lock member (71) is small, the lock member (71) cannot enter the gap (S) and waits with its front end pressed against the outer peripheral surface of the flange plate (65).

  In this state, when the back is tilted away from the backrest (40), the wedge-shaped front end of the lock member (71) automatically enters the gap (S) as shown in FIG. And the rotation of the flange plate (65) is locked. Thereby, since the pivot of the pivot portion (8a) and the backrest support rod (8) integrated with the flange plate (65) is also locked, the reclining of the backrest (40) becomes impossible.

  When the handle (78) is operated upward and the operating rod (76) and the rotating plate (77) are rotated clockwise in a side view, the operating spring (74) is greatly bent inward. As shown in FIG. 11, the backrest (40) can be reclined again by releasing the lock member (71) rearward from the gap (S) and unlocking the lock member (71).

  At this time, if the back is separated from the backrest (40) and the load applied to the backrest (40) is eliminated, the lock member (71) is easily detached from the gap (S).

  When such a backrest locking device is used, the lock member (71) enters the gap (S) to lock the backrest (40) unless the back is separated from the backrest (40). Since the locking member (71) cannot be released from the gap (S) and the backrest (40) cannot be locked, the backrest (40) is tilted backward rapidly, particularly when a backward load is applied to the backrest (40). Is prevented.

  In the above embodiment, the support piece (25) for supporting the rear portion of the seat body (11) by the support shaft (29), the upward protrusion (16) standing on the seat body (13), and It consists of an upward-facing seat support bracket (18) fixed to its side, but the upright projecting part (16) has a slightly larger standing dimension and its upper end is pivotally fitted directly to the support shaft (29). You may make it do.

  In the above embodiment, the locking member (71) that locks or releases the tilt of the backrest (40) is moved back and forth by the wire-shaped operating spring (74). A spring can also be used.

In addition, the lock device including the lock member (71), the operating spring (74), and the like may be only one of left and right.
The present invention can also be applied to a chair whose leg is composed of ordinary four legs.

It is a front view of a reclining chair to which the present invention is applied. Similarly, it is a side view. Similarly, it is a disassembled perspective view of the attaching part to the backrest support collar of a seat and a backrest. It is the IV-IV line expansion vertical rear view of FIG. Similarly, it is the VV line enlarged vertical front view of FIG. It is an enlarged plan view which removes a cover and shows a support base. It is the VII-VII line enlarged vertical front view of FIG. Similarly, it is a VIII-VIII line expansion vertical side view. Similarly, it is an IX-IX line enlarged vertical side view. Similarly, it is an XX line enlarged vertical rear view. It is a XI-XI line expansion vertical side view similarly. It is a vertical side view of the same site as FIG. 11 when the backrest is locked.

Explanation of symbols

(1) Chair
(2) Casters
(3) Footpad
(4) Leg
(5) pedestal
(6) Support base
(7) Seat support frame
(8) Back support
(8a) Axis
(9) Guide member
(9a) Guide groove
(10) Bolt
(11) Seat
(12) Cushion material
(13) Seat plate
(14) Slide member
(14a) Slide groove
(15) Recessed hole
(16) Upward protrusion
(16a) Side piece
(17) Mating groove
(18) Seat support bracket
(19) Through hole
(20) Bolt
(21) Fixed plate
(21a) Blocking piece
(22) Through hole
(23) Recess
(24) Nut
(25) Support piece
(26) Cover
(26a) Shaft-shaped protrusion
(27) Mounting hole
(28) Support cylinder
(28a) Projection shaft
(29) Spindle
(30) Square axis
(31) Round hole
(32) Bush with hook
(33) Back support member
(34) Square hole
(35) Bolt
(36) Through hole
(37) Female thread
(38) Cap
(39) Back frame mounting rod
(40) Backrest
(41) Back frame
(41a) Side frame
(41b) Mounting part
(42) Backboard
(43) Opening
(44) Mounting hole
(45) Groove
(46) Armrest
(46a) Downward mounting part
(47) Concave groove
(48) Through hole
(49) Bolt
(50) Through hole
(51) Female thread hole
(52) Mating recess
(53) Rubber torsion unit
(54) Inner cylinder
(55) Outer cylinder
(56) Torsion rubber
(57) Recess
(58) Protrusion
(59) Pin
(60) Bush
(61) Recess
(62) Bolt
(63) Fixing tool
(64) Cover
(65) Flange plate
(65a) Stopper step for front limit
(65b) Rear limit stopper step
(66) Notch
(67) Recess
(68) Bolt
(69) Contact member
(70) Contact part
(71) Lock member
(72) Guide groove
(73) Guide piece
(74) Actuating spring
(74a) Outward bending piece
(74b) Inward bending piece
(75) Projection
(76) Operation rod
(78) Operation handle

Claims (7)

The support base provided at the upper end of the leg body is provided with a back support support rod against the forward biasing means provided on the support base with a pivot portion facing the left and right direction at the lower end of the back support rod facing up and down. In the backrest locking device in the reclining chair, which is pivotally attached so as to be able to turn backward, and locks the tilt of the backrest attached to the backrest support heel, or releases the lock,
A front-end stopper step and a rear-end for restricting the maximum tilting amount of the backrest in the front-rear direction by contacting the upper and rear upper surfaces of the support base on the outer peripheral surface of the pivot portion of the backrest support rod In addition to protruding the stopper step, the rear limit stopper step formed when the front limit stopper step contacts the front upper surface of the support base and the rear upper surface of the support base rearward At the rear of the opening gap, a locking member that can be engaged and disengaged in the gap is provided so as to be movable in the front-rear direction, and the rear end of the elastic member that is convex upward in the side view and linked to the operation handle, By engaging with the lock member, the lock member is urged rearward from the gap when the operation handle is not operated, and the lock member moves forward when the operation handle is operated. To engage the gap. Backrest of the locking device in the reclining chair to.   The backrest locking device for the reclining chair according to claim 1, wherein the front limit stopper step portion, the rear limit stopper step portion, the lock member, and the elastic member are provided in pairs.   The backrest locking device for a reclining chair according to claim 1 or 2, wherein the elastic member is a wire-like operating spring.   The backrest of the reclining chair according to any one of claims 1 to 3, wherein the lock member has a wedge shape in which the vertical dimension gradually decreases toward the front, and the gap also has a wedge shape to which the lock member can be engaged and disengaged. Locking device.   The lock member is placed on the rear upper surface of the support base and is guided by a guide means provided on an immovable member on the upper surface of the support base so as to be slidable in the front-rear direction. Backrest locking device in recliner chairs.   An arcuate recess is formed on the upper surface of the support base to accommodate the lower half of the pivot, and the lower end of the front stopper step and the rear limit are provided on the upper and lower surfaces of the support sandwiching the recess, respectively. The backrest locking device for the reclining chair according to any one of claims 1 to 5, wherein the lower end of the stopper step portion is brought into contact with the reclining chair. The reclining chair according to any one of claims 1 to 6, wherein the elastic member is curved in an upward convex arc shape so as to straddle the upper surface of the pivot portion.

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