JP2001128774A - Adjuster of range of tilting movement of a seat back of chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adjuster of a range of tilting movement of a seat back in a chair in which the range of tilting movement of the seat back can be limited to an arbitrary range and the seat back can be fixed in an arbitrary position. SOLUTION: In a chair, the end bent forward from the lower part a seat back rod 25 for supporting a seat back is pivotally attached to a support base 5 fixed to the upper end of a pedestal 4 by a rotating shaft 32 directed right and left so that the seat back rod 25 is freely tilted rearward and downward against a spring. A tilting movement range adjusting member 37 associated with the seat back rod 25 and moving forward and backward relative to the support base 5 interlocking with the forward and backward rotation of the seat back 25 is mounted on the support base 5. At the front and back parts of the tilting movement range adjusting member 37 in the support base 5, block members 42 and 43 movable in the front and back directions for defining the front and back limits thereof are provided and operating means 53 for adjusting the front and back positions of the block members 42 and 43 are provided. Thus, the forward and backward movement range of the tilting movement range adjusting member 37 is adjusted by the operating means 53 to adjust the tilting movement range of the seat back rod 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair in which the backrest can be tilted rearward and downward against a spring so that the tilting range of the backrest can be adjusted. Related to the device.

[0002]

2. Description of the Related Art Various chairs have been proposed in which a backrest can be freely tilted rearward and downward against a spring.

[0003]

However, in the prior art, the backrest can be tilted between a substantially vertical standing position and a maximum rearward tilting position in which the backrest is tilted maximum downward and rearward. In addition, since the tilting range of the backrest could not be limited to an arbitrary range between the standing position and the maximum rearward tilting position, the usability was poor.

Further, the backrest cannot be fixed at an arbitrary position between the upright position and the maximum backward tilt position.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to limit the tilt range of the backrest to an arbitrary range, and to move the backrest at an arbitrary position. It is an object of the present invention to provide a tilting range adjusting device for a backrest in a chair, which can be fixed.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) A front end portion bent forward from a lower portion of a backrest rod supporting a backrest is pivotally attached to a support base fixed to an upper end portion of a pillar by a rotation shaft pointing left and right. In a chair that can be tilted rearward and downward against a spring, the support base is linked to the backrest rod, and interlocks with the back and forth rotation of the backrest rod in the front-rear direction with respect to the support base. A movable tilt range adjusting member is attached, and a movable block body is provided before and after the tilt range adjusting member on the support base to define a front end and a rear end thereof, and a front and rear position of the front and rear block bodies is adjusted. Operating means for adjusting the tilt range of the backrest rod by adjusting the range of movement of the tilt range adjusting member in the front-rear direction by the operating means.

(2) In the above item (1), the operating means is:
A pair of wire rods respectively linked to the two block bodies and drawing the block body in one of the front and rear directions; and the block body contracted between the wire rod and the block body and drawn by the wire rod toward the original position. And a spring for urging the battery.

(3) In the above item (2), the operating means is:
A rotary handle is provided for moving the block body in the front-rear direction by pushing and pulling a wire.

(4) In the above item (3),
A mark indicating the tiltable range of the backrest is attached.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A chair (1) provided with an embodiment of the present invention will be described below with reference to the accompanying drawings. In the following description, the left side of FIG. 1 is referred to as “front” and the right side is referred to as “rear”.

A caster (3) is provided at the tip of a support leg (2) extending radially from the center, and a pillar (4) pointing vertically is provided at the center of the support leg (2). Erected and pedestal
A support (5) is fixed to the upper end of (4). Foundation
(5) A tubular body (6) facing left and right is penetrated at a rear end of the tubular body (6).
The rotating shaft (8) provided with (7) is rotatable backward around the cylinder (6), and is rotated by a spring (not shown) such as a torsion bar provided inside the cylinder (6). It is provided in a state where it is urged in a direction to return to the state of 3.

A pair of left and right arms (9) projecting forward from both left and right sides of the front end of the support base (5) are provided with front and rear elongated holes (10). The long hole (10) and the shaft hole (14) of the hanging piece (13) provided at the front end of the lower surface of the seat receiver (12) with the seat (11) mounted on the upper surface A long pin (15) facing toward is inserted rotatably. As shown in FIG. 6, a compression coil spring (16) is contracted inside the arms (9) whose upper surface is closed by the upper lid (9a), and is fixed to the front end of the compression coil spring (16). The engaged member (17) engages the pin (15), so that the pin (15) is always in a long hole.
It is urged toward the front end of (10).

The seat receiver (12) has a substantially rectangular frame shape in plan view with a central portion opening substantially in a square shape, and has a long hole facing obliquely upward and forward at the right and left ends at the rear end of the opening. A bearing member (19) having a perforated (18) is provided, and between the left and right bearing members (19), it is directed slightly obliquely downward, and a horizontal An inclined piece (21) provided with an outwardly cylindrical protrusion (20) is provided.

As shown in FIG. 3, the lower ends of a pair of right and left mounting pieces (22) that are oriented substantially vertically are connected to each other by a connecting rod (23) that is oriented left and right. The lower end of the backrest (26) is attached to the left and right mounting pieces (22) of the backrest rod (25) having the forward end rod (24) connected to the lower end. At the front ends of the left and right forward rods (24), the inner surface and the front face are open, and the protrusions of the left and right rotation shafts (8) on the support base (5) are provided.
A fitting groove (27), which is complementary to (7), is formed.
7) is fitted to the protrusion 7 of the rotating shaft 8 and the front end of the forward-facing rod 24 and the protrusion 7 are screwed from outside the fitting groove 27 into the screw 2.
8) By stopping, the lower end of the backrest rod (25)
It is firmly fixed to both ends of (8).

The protruding shaft (20) of the seat receiver (12) slides in a guide groove (29) formed on the inner surface of the intermediate portion in the front-rear direction of the front-facing rod (24) and facing forward and obliquely downward. Fits freely. An upward lug (30) protrudes from the front end of the forward rod (24), and a shaft hole (31) drilled in the lug (30) has a shaft (32) facing left and right. The shaft (32) is inserted through the seat receiver (12).
And a circular pipe (41) of a tilt range adjusting member (37), which will be described later, which is attached to the upper part of the support base (5) so as to be movable in the front-rear direction.

As shown in FIGS. 7 to 11, a pair of left and right side grooves (33) are formed in the center of the upper surface of the support base (5). ), A recess (34) shallower than the side groove (33) is formed. The front wall of the recess (34) (3
5) is an inclined surface (35a) that slopes diagonally forward and right in plan view
And a regulating surface (35b) facing left and right provided continuously to the left end of the inclined surface (35a), and the rear wall (36) of the concave portion (34)
Is the slope (36a) parallel to the slope (35a) of the front wall (35)
And a regulating surface (36b) that is provided continuously to the right end of the inclined surface (36a) and faces in the left-right direction.

(37) The front end portions (38a) of a pair of left and right side pieces (38) extending obliquely upward and rearward are connected to each other by a connecting rod (39) facing left and right. A tilt range adjusting member formed by fitting and fixing both ends of a circular pipe (41) facing in the left-right direction to a circular mounting hole (40) formed in the part.

The connecting rod (39) of the tilt range adjusting member (37) is housed between the front and rear regulating surfaces (35b) and (36b) in the concave portion (34), and the front end portion (38) of the side piece (38). 38a) is loosely fitted in the side groove (33). Between the front wall (35) and the rear wall (36) and the connecting rod (39) in the concave portion (34), the block bodies (42) (43) having inclined surfaces (42a) (43a) formed at the corners. ), The inclined surfaces (42a) and (43a) of both block bodies (42) and (43) are the inclined surfaces (35a) and (36) of the front wall (35) and the rear wall (36).
It is housed in contact with a).

On the upper surfaces of the block bodies (42) and (43), cylindrical guide projections (44) are projected, and the guide projections (44) have fitting holes (45) whose upper surfaces are opened. ) Is provided, and the guide projection (4
The slit (46) is provided on both left and right sides in 4).

On the upper surface of the concave portion (34), a closing plate having a rectangular shape in a plan view is provided in which two guide grooves (47) and (48) parallel to the inclined surfaces (35a) and (36a) are bored side by side. (49) is covered and the obstruction plate (4
The front and rear both ends of 9) are fixed to the upper surface of the support base (5) with screws (50), and the guide protrusions (44) of the front and rear block bodies (42) and (43) are
They are slidably fitted in the front and rear guide grooves (47) and (48), respectively.

Reference numerals (51) and (52) denote wires covered by a covering material (53) made of a flexible material, for example, vinyl, excluding both ends, and both ends of the covering material (53) The cylindrical bodies (54) and (55) having both ends opened are fixed (see FIGS. 6, 7 and 12). The inner ends of the wires (51) and (52) are engaged with the engagement grooves (5) of the support pieces (56) protruding from the left and right sides of the closing plate (49).
7), and the inner cylindrical body (54) has a support piece (56).
Abuts the outer surface of the As shown in FIGS. 6 and 7,
A spherical fixed body (58) is fixed to the inner ends of the wires (51) and (52), and the wire (51) (5) is fixed between the fixed body (58) and the cylindrical body (54).
A compression coil spring (59) is contracted around 2),
The fixed body (58) is fitted in the fitting hole (45) of the guide projection (44) in a state where it is prevented from being pulled out.

As shown in FIG. 12, the outer ends of the wires (51) and (52) are connected to a box-shaped upper die (60) and a lower die (61) fixed to the left side surface of the seat receiver (12). And a case (62) consisting of The lower mold (61) is provided with two semi-cylindrical receiving grooves (63) arranged in front and rear, and a straight groove (64) facing left and right is formed in the center of the bottom surface of the receiving groove (63). Has been established. A semicircular upright piece (65) is provided on the left side edge of the upper surface of the lower mold (61), and a shaft hole (66) is formed in the upright piece (65).

At the right end of the upper surface of the lower mold (61), a hemispherical fixing hole (67) and a semi-cylindrical mounting hole (68) are provided, and the fixing hole (67) and the mounting hole are provided. A groove (69) for the wire (51) (52) is recessed between the (68) and the receiving groove (63), and the mounting hole (6
A groove (70) for the covering material (53) is recessed between the right end of (8) and the right edge of the upper surface of the lower mold (61).

A lower half of a rotary cylinder (71) having a right side opening is rotatably fitted in the front and rear receiving grooves (63).
The engaging shaft (72) protruding from the left side surface of (1) projects from the shaft hole (66) to the left of the standing piece (65), and the engaging shaft (72) has a handle.
(73) is fixed so as not to rotate relatively. At the upper part of the handle (73), the rotational position of the handle (73), and thus the backrest (2
A projection (74) indicating the tilt limit angle of 6) is provided. In this example, a mark (75) or the like directly indicating the tilt limit angle of the backrest (26) is attached to the left side surface of the handle (73).

Two oblique guide grooves (76) are formed in the opposite side surfaces of each rotary cylinder (71). Each part of both guide grooves (76) is 18
A vertical shaft (78) that is vertically spaced through a horizontal pulley (77) that is in a positional relationship of 0 ° and that is loosely fitted inside the rotary cylinder (71)
The upper and lower ends of the vertical shaft (78) are engaged with the two guide grooves (76) and slightly protrude upward and downward from the two guide grooves (76). It is slidably fitted in the linear groove (64) of (71).

As shown in FIG. 12, the lower half of the outer cylindrical body (55) is fitted in the mounting hole (68), and the lower half of the outer end of the covering material (53) is formed in the groove ( 70) and wire (51) (52)
After being wound around a pulley (77), the outer end of the wire is bent rightward, fitted into the groove (69), and is fixed to the outer end of the wire (51) (52). ) Is fitted in the fixing hole (67).

The left side wall of the upper mold (60) is formed with a semicircular engaging recess (80) which is complementary to the upright piece (65).
The lower surface of the lower die (61) has a receiving groove (63), a fixing hole (67), and a mounting hole
(68) and the groove (69) are provided with receiving grooves, fixing holes, mounting holes and grooves (all not shown) which are vertically symmetrical with the upper die (60).
Is fixed to the lower mold (61) with screws (not shown), and the upper end of the vertical shaft (78) is aligned with the straight groove of the receiving groove of the upper mold (60).
(Not shown), and slidably fit into the rotating cylinder (71),
Cylindrical body (55), fixed body (79), wire (51) (52), coating material (5
3) The upper half part fits into the receiving groove, mounting hole, fixing hole and groove of the upper die (60).

Next, the operation of the chair (1) of the present embodiment having the above configuration will be described.

The chair (1) always has a compression coil spring (16).
1 and 4 by the urging force of a spring such as a torsion bar.

As shown in FIGS. 1 and 4, when the seat (11) is in the horizontal position and the backrest (26) is in the upright position, the user (A) (not shown in FIG. 5) When seated on the seat (11) and leaning against the backrest (26), the backrest rod (25) pivots rearward and downward to incline to the maximum rearwardly inclined position shown in FIGS. , While the protruding shaft (20) slides forward and downward in the guide groove (29), is pulled rearward and downward, and the pin (15)
Moves toward the rear end of the slot (10), and the slot (18)
By moving rearward and downward relative to (32), the seat (11) tilts rearward and downward to the maximum tilt position shown in FIGS.

By operating the handle (73), the tilt range of the backrest (26) and the seat (11) can be adjusted.

That is, in the state shown in FIGS. 1, 2, 4 and 5, the connecting rod (39) of the tilt range adjusting member (37) in the recess (34) and the front and rear block bodies (42) ( 43) is at a position as shown in FIG. 8, and the connecting rod (39) is located at the front and rear regulating surfaces (35b).
(36b) can be freely moved in the front-rear direction.

When the rear handle (73) is turned halfway forward from this state, the rear rotary cylinder (71) rotates forward, so that the vertical shaft (78) moves right and left in the guide groove (76). The wire (52) is pulled by this, and the rear block body (43) moves rightward along the inclined surface (36a) and moves to the position shown in FIG. Since the compression coil spring (59) urges the block body (43) to the left,
The block body (43) is held in that position.

By doing so, the block body (43) is
The range of movement of the connecting rod (39) to the rear is limited by the amount of movement of the backrest (2).
Even if the user leans on the backrest (26) to lean backward and downward, the connecting rod (39) cannot move backward from the position shown by the imaginary line in FIG. Circular pipe (4
The shaft (32) interlocking with 1) cannot move further backward and downward, and as a result, the backrest (26) and the seat (11) are moved to the positions shown in FIGS. 1 and 4 and FIGS. 2 and 5. It can only be tilted to the middle position between the indicated positions.

Although the illustration is omitted, the mark (75) of the rear handle (73) is oriented substantially vertically, and the user (A) must visually check the mark (75). Thereby, it is possible to know that the backrest (26) and the seat (11) cannot be tilted to the maximum backward tilt position and the maximum tilt position.

Further, when the rear handle (73) is turned as far forward as possible, the rear block body (43) moves to the position shown in FIG. 10, and the front and rear block bodies (42) and (43) are connected. Since the rod (39) is clamped and the connecting rod (39) cannot be moved back and forth, the backrest (2
6) and the seat (11) are fixed in the positions shown in FIGS. 1 and 4, and cannot be tilted at all.

Although illustration is omitted, at this time, the mark (75) of the rear handle (73) is inclined forward, and the front handle (7) is tilted forward.
The mark (75) is parallel to the mark (3), and by observing the mark (75), the user (A) can use the backrest (26) and the seat.
It can be seen from FIG. 1 and FIG. 4 that (11) cannot tilt.

Further, while the backrest (26) and the seat (11) are slightly tilted, and the rear handle (73) is in the state shown in FIGS. 1, 2, 4 and 5, the front handle ( When the back block (42) is rotated halfway backward, the front block (42) moves to the position shown in FIG. 11, so that the backrest (26) and the seat (11) are moved to the positions shown in FIGS.
And the backrest (26) can be tilted only in the range from the position tilted slightly backward and downward from the state of FIGS. 1 and 4 to the maximum rearward tilt position shown in FIGS. 2 and 5, And seat
In (11), only the range from the position tilted slightly backward and downward from the horizontal position shown in FIGS. 1 and 4 to the maximum tilt position shown in FIGS. 2 and 5 can be tilted.

Although not shown, the mark (75) of the handle (73) on the front side is almost vertically oriented.
By confirming (75), the user (A) can use the backrest (26)
And the seat (11) can be tilted only in the range from the position tilted slightly rearward and downward from the standing position and the horizontal position to the maximum rearward tilting position and the maximum tilting position.

Although not shown, after moving the backrest (26) and the seat (11) to the maximum rearwardly inclined position and the maximum inclined position shown in FIGS. 2 and 5, the front handle (73) Turn the back as far as possible so that the mark (75) on the front handle (73) is parallel to the mark (75) on the rear handle (73), and the backrest (26) and seat (11) Are held at the maximum backward tilt position and the maximum tilt position.

Further, although not shown, the backrest (2
After tilting the seat (11) to any position between the horizontal position and the maximum tilt position, in conjunction with this, the seat (11) is tilted to any position between the horizontal position and the maximum tilt position. When the front and rear handles (73) are turned backward and forward by a predetermined angle, and the connecting rod (39) is clamped between the front and rear block bodies (42) and (43), the backrest (26) and the seat (11) are It is held at this position and cannot tilt.

In the state shown in FIGS. 1 and 4, the marks (75) and (75) of the front and rear handles (73) and (73) form an inverted figure of eight, and by visually observing the figure, the use Person (A)
It can be seen that (26) and the seat (11) can tilt in the maximum range.

[0043]

According to the present invention, the following effects can be obtained. (A) According to the first aspect of the present invention, the tilting range of the backrest can be adjusted in an arbitrary range by adjusting the range of movement of the tilting range adjusting member in conjunction with the backrest rod in the front-rear direction. Can be fixed at an arbitrary position, which is very convenient.

(B) According to the second aspect of the present invention, since the block body is moved in the front-rear direction using the wire, the moving distance of the block body can be finely adjusted, and the tilting range of the backrest can be precisely adjusted. Can be adjusted well.

(C) According to the third aspect of the present invention, the operation of moving the block body can be performed more easily.

(D) According to the fourth aspect of the present invention, by checking the mark on the handle, the tiltable range of the backrest can be easily grasped.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a user is seated on a chair provided with an embodiment of the present invention.

FIG. 2 is a side view of the chair when the seat and the backrest are moved to a reclining state.

FIG. 3 is an exploded perspective view of a main part of the chair.

FIG. 4 is an enlarged side view of a main part of the chair.

FIG. 5 is an enlarged side view of a main part of the chair when the seat and the backrest are moved to a reclining state.

FIG. 6 is an enlarged perspective view of a part of the main part of the chair.

FIG. 7 is an enlarged exploded perspective view of a main part of the chair.

FIG. 8 is a plan view of a main part when the backrest and the seat are tiltable in the maximum range.

FIG. 9 is a plan view of a main part showing a state where the tilt range of the backrest and the seat is narrowed.

FIG. 10 is a plan view of a main part showing a state in which the backrest and the seat cannot be tilted.

FIG. 11 is a plan view of a main part showing a state where the tilt range of the backrest and the seat is narrowed.

FIG. 12 is an enlarged exploded perspective view of the operation device.

FIG. 13 is an enlarged plan view of the lower die.

FIG. 14 is an enlarged plan view of the rotary cylinder.

[Explanation of symbols]

 (1) Chair (2) Support leg (3) Caster (4) Pillar (5) Support base (6) Cylindrical body (7) Projection (8) Rotation axis (9) Arm (9a) Top cover (10) Slot (11) Seat (12) Seat receiver (13) Hanging piece (14) Shaft hole (15) Pin (16) Compression coil spring (spring) (17) Engagement member (18) Slot (19) Bearing Member (20) Projecting shaft (21) Inclined piece (22) Mounting piece (23) Connecting rod (24) Forward rod (25) Backrest rod (26) Backrest (27) Fitting groove (28) Screw (29) Guide groove (30) Ear piece (31) Shaft hole (32) Shaft (33) Side groove (34) Recess (35) Front wall (35a) Inclined surface (35b) Regulation surface (36) Rear wall (36a) Inclined Surface (36b) regulating surface (37) tilting range adjustment member (38) side piece (38a) front end (39) connecting rod (40) mounting hole (41) circular tube (42) block body (42a) inclined surface (43 ) Block (43a) Inclined surface (44) Guide projection (45) Fitting hole (46) Slit (47) (48) Guide groove (49) Closure plate (50) Screw (51) (52) Wire (wire material) (Operation means) (53) Coating material (54) (55) Cylindrical body (56) Support piece (57) Engagement groove (58) Fixed body (59) Compression coil spring (Operation means) (60) Upper die ( 61) Lower type (62) Case (operation means) (63) Receiving groove (64) Straight groove (operation means) (65) Standing piece (66) Shaft hole (67) Fixing hole (68) Mounting hole (69) Groove (70) Groove (71) Rotating cylinder (operation means) (72) Engagement groove (73) Handle (operation means) (74) Projection (75) Mark (76) Guide groove (77) Pulley (operation means) (78) Vertical axis (operation means) (79) Fixed body (80) Engagement recess

Claims (4)

[Claims] 1. A front end portion bent forward from a lower portion of a backrest rod for supporting a backrest is pivotally attached to a support base fixed to an upper end portion of a pillar by a rotation shaft pointing left and right. In a chair in which the backing bar can be tilted rearward and downward against a spring, the backing bar is linked to the backrest bar, and the backrest bar is moved back and forth with respect to the support base in conjunction with the back and forth rotation of the backrest bar. A tilt range adjusting member that moves in the direction is mounted, and a block body that is movable in the front and rear direction that defines its front and rear limits is provided before and after the tilt range adjusting member on the support base, and the front and rear positions of the front and rear block bodies A tilting range of the backrest rod is adjusted by adjusting a moving range of the tilting range adjusting member in the front-rear direction by the operating means. Device for adjusting the tilt range of the backrest. 2. A pair of wires, each of which is linked to both of the blocks and pulls the block in one of the front and rear directions, and a pair of wires which are contracted between the wires and the block, and which are drawn by the wires. 2. The device according to claim 1, further comprising a spring for urging the block body toward the original position. 3. The tilt of the backrest in the chair according to claim 2, wherein the operating means includes a rotary handle for moving the block body in the front-rear direction by pushing and pulling a wire. Range adjuster. 4. A device for adjusting the tilt range of a backrest in a chair according to claim 3, wherein the handle is provided with a projection or a mark indicating a tilt limit angle of the backrest.