JP4842003B2 - Chair - Google Patents

Description

  The present invention provides an operation mechanism for operating a gas spring for adjusting the height of a seat body on a support base provided at the upper end of a pedestal, and a backrest lock that locks the tilt of the backrest and releases the lock. The present invention relates to a chair provided with a mechanism.

In order to improve sitting comfort, there are chairs described in Patent Documents 1 and 2, for example, in which the height of the seat body and the back and forth position of the backrest can be adjusted.
JP 2004-33449 A JP-A-2005-177180

  Each of the chairs described in Patent Documents 1 and 2 includes an operation mechanism and an adjustment mechanism for adjusting the height of the seat body, adjusting the back and forth position of the backrest, the tilting strength, and the like. They are assembled and assembled on the upper surface of a support base (support) fixed to the upper end of the column, and they are covered by an upper cover attached to the support base.

  As a result, the shape of the support base becomes complicated, the manufacturing cost increases, and a large number of parts must be assembled and assembled in a narrow space on the support base, resulting in troublesome assembly and work efficiency. Becomes worse.

In addition, since the assembly process of the support base and the assembly process of the operation mechanism and the adjustment mechanism need to be performed simultaneously on one assembly line, the assembly efficiency is poor.
Furthermore, when the operation mechanism and the adjustment mechanism are assembled to the support base, workability when performing component conversion, maintenance, or the like is deteriorated.

  The present invention has been made in view of the above problems, and allows an operation mechanism and a lock mechanism for adjusting the height of the seat body and the position of the backrest to be assembled on the lower surface of the upper cover in the support base, Provide a chair that simplifies the structure of the support base, reduces costs, improves work efficiency and assembly efficiency during assembly, and facilitates parts replacement and maintenance. The purpose is to do.

According to the present invention, the above problem is solved as follows.
(1) A support base for supporting the seat body is provided at the upper end of a pedestal that can be extended and contracted by a gas spring with a lock, and an operating mechanism for releasing the lock of the gas spring is provided on the support base. In the adjustable chair, the support base includes a support base and an upper cover attached to the upper surface of the support base, and the operation mechanism is held by a support member on the lower surface of the upper cover.

(2) In the above item (1), the operating mechanism is oriented in the left-right direction and the intermediate portion is pivotally supported on the lower surface of the upper cover by the support member, and is close to the operating rod in parallel. As shown in the figure, the middle part in the left-right direction is received by the lower surface of the upper cover with the support plate, and the other end is directed downward by pushing the one side end upward by the push rod provided on the operating rod. And an actuating rod adapted to be able to push the unlocking rod provided at the upper end of the gas spring.

(3) In the above item (1), a backrest locking mechanism that locks the tilting of the backrest and releases the lock is provided on the support base. A lower surface is held with a support member.

(4) In the above item (3), the backrest locking mechanism is directed in the left-right direction on the opposite side of the operation mechanism to the operation mechanism, and the intermediate portion is rotatably supported on the lower surface of the upper cover by the support member. And a back support rod supported on the lower surface of the upper cover so as not to fall off and move back and forth, and pivotally supported on the support base so as to be able to rotate back and forth. A locking member that can be engaged and disengaged from the rear in the gap provided, and the rear end is locked to the locking member, and the front end is linked to the operation lever of the backrest locking mechanism, so that the operation lever can be rotated. It is provided with an operation spring having a convex arc shape in side view that can move the lock member in the front-rear direction.

(5) In the above item (4), the operating rod of the backrest locking mechanism is supported so as to be coaxial with the operating rod of the operating mechanism.

  According to the first aspect of the present invention, the operating mechanism for releasing the lock of the gas spring provided on the pedestal is attached to the lower surface of the upper cover of the supporting base while being held by the supporting member. Compared with the conventional one in which the operating mechanism is assembled, the structure of the support base is simplified, and the manufacturing cost can be reduced.

In addition, it is not necessary to assemble many parts in a narrow space on the support base. In addition, the support base is attached to the pedestal, the backrest is attached to the support base, and the top cover is operated. Since the process of assembling the mechanism can be separated and performed in a separate process, it is possible to move to the support base of the operation mechanism by simply fixing the upper cover with the operation mechanism assembled in advance to the upper surface of the support base. Assembly is completed, and the assembly efficiency is improved.
Furthermore, the parts of the operation mechanism can be easily replaced and maintained by simply removing the upper cover from the support base.

  According to the second aspect of the invention, since the number of parts of the members constituting the operation mechanism is small, the operation mechanism can be easily assembled to the upper cover, and the operation rod and the operation rod are parallel to each other. Since they are close to each other, the area occupied by the member support portion of the upper cover can be minimized, the front and rear dimensions of the upper cover can be reduced, and the structure is simplified, so that the manufacturing cost is reduced.

  According to the third aspect of the present invention, the backrest locking mechanism is also assembled to the lower surface of the upper cover, so that the two mechanisms can be integrated into the upper cover, and the structure of the support base can be simplified. Assembling efficiency and maintainability to the support base are also improved.

  According to invention of Claim 4, each member which comprises a backrest lock mechanism can be assembled | attached to the lower surface of an upper cover so that it may not interfere with an operation mechanism.

According to the fifth aspect of the present invention, the operation mechanism of the gas spring and the operation lever of the backrest lock mechanism are supported so as to be coaxial with each other. The shape of the upper cover can be facilitated.
In addition, both operating rods can be supported by the support member having the same shape, so that the cost can be reduced.

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 the chair (1) faces a radial direction in which a caster (2) is attached to the tip. A leg (4) having a leg rod (3), a pedestal (5) erected at the center thereof, and a support base (6) with the center of the front end attached to the upper end of the pedestal (5) ).

  The support base (6) is fixed to the upper end of the pedestal (5) and has a box-like support base (7) with an open top surface, and a box-shaped upper cover with an open bottom surface covering the top surface ( 8).

  As shown in FIG. 3, the pedestal (5) and the support base (7) fixed to the pedestal (5) are provided with a lock release rod (9a) of the gas spring with lock (9) housed in the pedestal (5). The vertical position can be adjusted by being pushed by an operation mechanism (33) described later.

  (10) and (10) are a pair of left and right back support rods, each having a generally U-shape when viewed from the side, and an inward horizontal pivot portion (10a) connected to the lower end.

  The upper projecting pieces (not shown) of the upper ends of the back support members (11) and (11) facing the left and right directions fixed to the upper ends of the left and right back support rods (10) The lower ends on both sides are fitted and fixed by screws (not shown).

  At the front end of the support base (7), a seat support frame (13) in the form of a frame in plan view that extends obliquely forward and expands outward as it goes forward is integrally connected to this seat. As shown in FIGS. 3 and 4, a pair of outward U-shaped guide grooves (14a) (14a) facing the front-rear direction are formed on the upper surfaces of the left and right front end portions of the support frame (13). The guide member (14) is fixed by a bolt (15).

  The left and right guide members (14) include slide members (18), (18) (18) (18) in which the lower surfaces of both sides of the front end portion of the seat plate (17) made of synthetic resin in the seat body (16) are integrally formed. ) Is supported so as to be movable in the front-rear direction by slidably fitting the groove-shaped slide groove (18a) on the lower surface in both guide grooves (14a).

  The upper ends of a pair of left and right seat support pieces (19) and (19), which are integrally projected upward at the rear end portions of the left and right sides of the seat plate (17), are pivoted to the left and right back support members (11). As a result, the rear end of the seat body (16) is pivotably supported by the left and right backrest support rods (10).

  As shown in FIG. 3, in the center of the recess on the upper surface of the support base (7), an inner cylinder (20) facing in the left-right direction, an outer cylinder (21) having a larger diameter and shorter than that, A known rubber torsion unit (23) comprising a torsion rubber (22) fixed between them is accommodated with the outer cylinder (21) being prevented from rotating.

  As shown in FIG. 5, the inner ends of the pivot portions (10a) of the left and right back support rods (10) are externally fitted to both ends of the inner cylinder (20) in the rubber torsion unit (23). By inserting a pin (24) into them, they are connected so as not to rotate relative to each other.

As a result, the left and right backrest support ridges (10) and the backrest (12) attached thereto have a torsional resistance generated when the inner cylinder (20) elastically deforms the torsion rubber (22) in the circumferential direction. A biasing force is applied.
The rubber torsion unit (23) is assembled in a state where an initial urging force is applied to the inner cylinder (20) so that the backrest support ridge (10) is always urged forward.

  In the upper half of the outer peripheral surface of the inner end portion of the pivot portion (10a) of the left and right back support rods (10), there are flange-like protrusions (25) facing in the direction perpendicular to the axis of the pivot portion (10a). The front limit stopper step (25a) is formed on the lower surface of the forward projecting portion and the lower surface of the rear projecting portion, and the rear limit stopper to be positioned slightly above it. A step portion (25b) is formed.

  The front limit stopper step (25a) is loosely fitted in the recesses (26) on the upper surfaces of the left and right sides of the support base (7) so as to be movable in the front-rear direction, and is inserted from the lower surface of the support base (7). The front limit stopper member (28) fixed by the bolt (27) is always in contact with the upper limit stopper member (28), and the rear limit stopper step (25b) is the rear limit of the rear upper surface of the support base (7). It can come into contact with the stopper surface (29). Thereby, the maximum tilting amount in the front-rear direction of the backrest support heel (10) and the backrest (12) is regulated.

  When the front-stage stopper stepped portion (25a) abuts the upper surface of the front-end stopper member (28), the rear-limit stoppered step portion (25b) and the rear-end stopper surface (29) Is formed with a gap (S) that opens rearward.

  6 and 7 show an exploded perspective view and a bottom view of the upper cover (8) as viewed from below.

  The lower surface of the upper cover (8) is recessed upward in a dish shape, and the semicircular concave grooves (30) formed in the center of the left and right sides are provided with the left and right backrest support rods (10). A bolt (not shown) that is pivotally fitted to the pivot portion (10a) of the shaft and inserted from the insertion holes (31) provided at the four corners is a female screw hole on the upper surface of the support base (7). By screwing into (32), the upper cover (8) is detachably attached to the upper surface of the support base (7).

  On the lower surface of the upper cover (8), the lock release rod (9a) of the gas spring (9) is pushed to extend and retract the pedestal (5) to adjust the height of the seat (16). A gas spring operating mechanism (33) and a backrest locking mechanism (34) that adjusts the back and forth position of the backrest (12) by locking and unlocking the tilt of the backrest support heel (10) However, it is assembled as follows.

  The gas spring operating mechanism (33) includes an operating rod (36) having an operating handle (35) on the outer end and facing in the left-right direction, and a push rod (projecting forward) on the inner end of the operating rod (36). 37) and a rotating shaft (38) that faces in the left-right direction perpendicular to the push rod (37) and whose outer end can be pushed upward by the push rod (37), and that faces the middle portion in the front-rear direction. And a push rod (40) facing the up-and-down direction that can press the unlocking rod (9a) of the gas spring (9) press-fitted to the inner end of the operating rod (39) And.

  As shown in FIG. 8, the operating rod (36) includes a support member (41) inserted into the inner end of the operating rod (36) and having a slit-shaped split groove on a part of the outer periphery. After inserting into the recess (42) on the lower surface of the side end near the front end on the right side in (8), the mounting piece (41a) connected to the support member (41) and facing backward is attached with the bolt (43). By being screwed to the lower surface of the upper cover (8), it is assembled to the lower surface of the upper cover (8) in a state of being rotatably supported by a support member (41).

  Support pieces (44) and (45) for mounting the operating rod (39) are provided on the lower surface of the front end of the upper cover (8) slightly closer to the center and project slightly apart from the front and rear. (45) is formed with a U-shaped support groove (46) facing downward in the front view with the rear surface closed.

  The operating rod (39) has its rotation shaft (38) positioned in the support groove (46) of the support piece (45) and the outer end of the operating rod (39) positioned above the push rod (37). The front end of the support plate (47) brought into contact with the lower ends of both support pieces (44) (45) is connected to the front support piece (44) with bolts (48 ) Is fixed to the lower surface of the upper cover (8) so that it can swing up and down about the rotation shaft (38).

  After the assembly, when the upper cover (8) is attached to the upper surface of the support base (7), the lower end of the push rod (40) is the upper end of the lock release rod (9a) of the gas spring (9). It is designed to face each other in close proximity. Accordingly, when the operating handle (35) is rotated upward in FIG. 6, the operating rod (39) is swung by the push rod (37), and the push rod (40) is moved downward in FIG. As a result, the upper end of the lock release rod (9a) is pushed and the lock of the gas spring (9) is released.

  The backrest locking mechanism (34) includes a long operating rod (51) having an operating handle (50) on the outer end, and a pair of long left and right fronts fixed to the inner end of the operating rod (51). Rotating pieces (52), (52), a pair of left and right actuating springs (53), (53) curved in a convex arc shape upward, a pair of left and right locking members (54), (54), It has.

  As with the operation rod (36) on the side of the gas spring operation mechanism (33), the operation rod (51) is configured so that the support member (41) inserted in the intermediate portion is connected to the left side end portion of the upper cover (8). Fit into the recess (42) on the lower surface and fix the mounting piece (41a) (see FIG. 8) with the bolt (43), so that it is coaxial with the right operation rod (36) on the lower surface of the upper cover (8). It is assembled so that it can rotate.

  The outward bent pieces (53a) at the rear ends of the left and right actuating springs (53) are respectively fitted in fitting holes (not shown) facing the left and right in the middle part of the left and right lock members (54). The inwardly bent piece (53b) at the front end is fitted in a fitting hole (not shown) at the front end of the left and right rotating pieces (52). Thus, the left and right rotating pieces (52) and the left and right lock members (54) are linked via the operating spring (53), and when the operation handle (50) is rotated downward in FIG. The lock member (54) can be moved forward by the operating spring (53).

  The left and right lock members (54) are in contact with the lower surfaces of the support pieces (55) and (55) projecting from the lower surfaces of the left and right sides of the rear end of the upper cover (8), and form an inverted L shape when viewed from the front. By fixing the rear end of the holding plate (56) (56) to the lower surface of the upper cover (8) with a bolt (57), it is assembled to the lower surface of the upper cover (8) so as to be movable in the front-rear direction. Yes.

  At the time of this assembly, the operating spring (53) is loosely fitted into a guide groove (58) facing the front-rear direction provided on the lower surface of the upper cover (8).

  Reference numeral (59) is a click spring (torsion coil spring). One of the left and right foot pieces (59a) is fixed to the lower surface of the front end of the upper cover (8) with a bolt (60). The operating handle (50) is made substantially horizontal by engaging the other foot piece (59b) with the lower part of the front end of the left rotating piece (52) and engaging it with the back surface. It can be rotated with a sense of moderation between the non-operation position and the downward operation position.

  FIG. 9 is a view when the upper cover (8) after assembling the constituent members of the gas spring operating mechanism (33) and the backrest locking mechanism (34) is fixed to the upper surface of the support base (7). 5 is a vertical side view of the same part as FIG. 5 and shows the non-operating state of the operation handle (50).

  At this time, the lock member (54) assembled to the lower surface of the rear end portion of the upper cover (8) does not rotate the operating rod (51) and the rotating piece (52). Due to the urging force, it is located at the rear limit and retracts backward from the gap (S) between the rear limit stopper stepped portion (25b) and the rear limit stopper surface (29).

  Accordingly, the backrest supporting heel (10) and backrest (12) have a front limit stopper stepped portion (25a) and a rear limit stopper stepped portion (25b), respectively. And reclining in the front-rear direction within a range in contact with the upper surface of the rear limit stopper surface (29).

  When the operating handle (50) is rotated downward, as shown in FIG. 10, the operating rod (51) and the rotating piece (52) are rotated counterclockwise as viewed from the side, whereby the operating spring (53) is moved. Pulled forward, the lock member (54) moves forward. Thereby, when the backrest (12) is moved to the front limit, the front end portion of the lock member (54) enters the gap (S), and the backrest support rod (10) rotates in the front-rear direction. Is locked, so reclining of the backrest (12) becomes impossible.

  Although not shown, when the operation handle (35) on the gas spring operation mechanism (33) side is turned upward with the upper cover (8) attached to the support base (7), as described above. In addition, the push rod (37) of the operating rod (36) rotates upward, the push rod (40) of the operating rod (39) moves downward, and the unlocking rod (9a) of the gas spring (9) is moved. ) Can be adjusted to adjust the height of the seat (10).

  As described above, in the chair (1) of the above-described embodiment, the operating rod (36) and the operating rod constituting the gas spring operating mechanism (33) for adjusting the height of the seat (16). (39) is held by a support member (41) and a support plate (47) fixed to the lower surface of the upper cover (8) by bolts (43) and (48) to prevent falling, and the backrest (12) An operation rod (51), a lock member (54), etc. that constitute a backrest lock mechanism (34) that locks or unlocks the tilting and adjusts the front-rear position thereof are also provided on the lower surface of the upper cover (8). Since the fall is prevented by the support member (41) and the holding plate (56) fixed by the bolts (43) and (57), all of which constitutes the gas spring operation mechanism (33) and the backrest lock mechanism (34) These members can be assembled and assembled on the lower surface of the upper cover (8).

As a result, the structure can be simplified and the manufacturing cost can be reduced as compared with the conventional structure in which the members are assembled and assembled on the support base (7).
Moreover, since it is not necessary to assemble many parts in a narrow space on the support base (7), the assemble becomes easy and the work efficiency is improved.

  In addition, the support base (7) is assembled to the leg (3), the rubber torsion unit (23) and the backrest support rod (10) are assembled on the support base (7), and the upper cover ( 8) Since the process of assembling the gas spring operating mechanism (33) and the backrest locking mechanism (34) can be performed separately, the upper cover (all members previously assembled in separate processes) 8) is simply fixed to the upper surface of the support base (7), and the assembly of the gas spring operating mechanism (33) and the backrest lock mechanism (34) to the support base (6) is completed. Will improve.

  By simply removing the upper cover (8) from the support base (7), parts replacement and maintenance of the gas spring operating mechanism (33) and backrest locking mechanism (34) can be performed, so their workability is improved. .

It is a front view which shows one Embodiment of the reclining chair to which this invention is applied. Similarly, it is a side view. It is a top view of the principal part which follows the III-III line of FIG. It is the IV-IV line expansion vertical rear view of FIG. It is the VV line expansion vertical side view of FIG. FIG. 3 is an exploded perspective view of an upper cover and members assembled thereto when viewed from below. Similarly, it is a bottom view of the state where the operation mechanism and the backrest locking mechanism are assembled to the upper cover. It is the XIII-XIII line vertical side view of FIG. FIG. 6 is a longitudinal side view of the same portion as FIG. 5 after the upper cover is attached to the support base. Similarly, it is a vertical side view when operating the backrest locking mechanism to lock the tilting of the backrest.

Explanation of symbols

(1) Reclining chair
(2) Casters
(3) Footpad
(4) Leg
(5) pedestal
(6) Support base
(7) Support base
(8) Upper cover
(9) Gas spring
(9a) Unlock 杆
(10) Back support
(10a) Axis
(11) Back support member
(12) Backrest
(13) Seat support frame
(14) Guide member
(14a) Guide groove
(15) Bolt
(16) Seat
(17) Seat plate
(18) Slide member
(18a) Slide groove
(19) Seat support piece
(20) Inner cylinder
(21) Outer cylinder
(22) Torsion rubber
(23) Rubber torsion unit
(24) Pin
(25) Projection
(25a) Stopped stepped part for front limit
(25b) Stopped stepped part for rear limit
(26) Recess
(27) Bolt
(28) Front limit stopper member
(29) Rear limit stopper surface
(30) Concave groove
(31) Insertion hole
(32) Female thread hole
(33) Gas spring operation mechanism
(34) Backrest lock mechanism
(35) Operation handle
(36) Operation 杆
(37) Push rod
(38) Rotating shaft
(39) Working rod
(40) Push rod
(41) Support member
(41a) Mounting piece
(42) Recess
(43) Bolt
(44) (45) Support piece
(46) Support groove
(47) Support plate
(48) Bolt
(50) Operation handle
(51) Operation 杆
(52) Rotating piece
(53) Actuating spring
(53a) Outward bending piece
(53b) Inward bending piece
(54) Lock member
(55) Support piece
(56) Retaining plate
(57) Bolt
(58) Guide groove
(59) Click spring
(59a) (59b) Foot piece
(60) Bolt
(61) Locking piece
(S) Gap

Claims (5)

  Adjustable seat height by providing a support base to support the seat body at the upper end of the pedestal that can be expanded and contracted by a gas spring with a lock, and an operating mechanism to unlock the gas spring. The chair is characterized in that the support base comprises a support base and an upper cover attached to the upper surface of the support base, and the operation mechanism is held by a support member on the lower surface of the upper cover. .   The operation mechanism is oriented in the left-right direction, and the operation cover that is pivotally supported on the lower surface of the upper cover by the support member and the lower surface of the upper cover so as to be close to the operation cover in parallel. The middle part of the direction is received by the support plate, and one end is pushed upward by a push rod provided on the operating rod, so that the other end is turned downward to the upper end of the gas spring. The chair according to claim 1, further comprising an actuating rod adapted to push the provided unlocking rod.   A backrest locking mechanism that locks and releases the tilting of the backrest is provided on the support base, and this backrest locking mechanism is also held by a support member on the lower surface of the upper cover. The chair according to claim 1.   The backrest lock mechanism is oriented in the left-right direction on the opposite side of the operation mechanism to the operation mechanism, and the intermediate part is pivotally supported on the lower surface of the upper cover by the support member, and the upper cover is located behind the operation function Is supported on the lower surface of the support base so as not to fall off and movable back and forth, and can be engaged and disengaged from the back in a gap provided between the back support base pivotally supported by the support base so as to be able to rotate back and forth. A side surface on which the lock member can be moved in the front-rear direction by a rotation operation of the lock member by engaging the lock member with a rear end thereof and linking the front end to the operation rod of the backrest lock mechanism. The chair according to claim 3, further comprising an operation spring having a convex arc shape. The chair according to claim 4, wherein an operation rod of the backrest lock mechanism is supported so as to be coaxial with the operation rod of the operation mechanism.

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