JP4018776B2 - Chair armrest equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an armrest device for a chair pivotally attached to a seat base so that the backrest can be tilted backward.
[0002]
[Prior art]
Bridges the top of the pair of left and right legs, the support base for placing the seat on the top, in the backrest of Ko傾capable pivoted to chair, armrests, usually on top of the legs, a bolt, It is attached with rivets.
[0003]
[Problems to be solved by the invention]
Therefore, in the conventional chair, even if the seated person tilts the backrest backward, the armrest does not tilt backward following the backrest , and the backrest separates from the armrest, giving a sense of incongruity to the seated person Sometimes.
[0004]
In view of the above-described problems of the conventional chair, the present invention provides an armrest device for a chair that follows the back tilt of the backrest and tilts the armrest backward so as not to give a strange feeling to the seated person. With the goal.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) is extended between an upper portion of a pair of left and right legs, the support base seat at the top that is placed in the rear tiltable pivotally attached to the chair backrest,
The lower part of the backrest is pivoted with a backrest support shaft facing in the left-right direction slightly inside the both side ends of the support base, and the rear part is attached to the backrest at both side ends of the support base. The lower part of the armrest is pivotally attached with the armrest support shaft facing the left-right direction in which the axial center coincides with the backrest support shaft and connects the support base and the leg .
[0006]
(2) In the above item (1), the lower part of the armrest is inserted into the recess between the pair of left and right armrest support bearings formed on the left and right sides of the support base, and the pair of armrest support bearings and the lower part of the armrest are inserted. The armrest support shaft is passed through.
[0007]
(3) Item (1), formed in the shape of a circular arc around the pivot point of the armrest the upper end surface of the leg to form a leg receiving Re stepped portion on the outer portion of the bottom of the armrest.
[0008]
In (4) above (3) section, the projecting portion facing the vertical direction on one of the opposing portions facing each other in the vertical direction between the upper end surface and the armrest of the leg receiving Re stepped portion of the leg is provided, a projecting portion on the other Provide a receiving groove .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
Chair (1) includes a leg (2) to the left and right sides and armrest (7) support base (the one leg and armrest not shown) Ru with a (3), a front-rear direction provided in the support base (3) A torsion bar (4) facing, a seat (5) provided on the support base (3) directly on the support base (3) or via the torsion bar (4), and provided on the support base (3) so as to tilt forward and backward. And a backrest (6) connected to the seat (5).
[0010]
Left and right armrest (7), as shown in FIG. 1, the support base (3) the armrest support shaft facing the lateral direction provided on both ends of the (9) I also, also backrest (6), in internal side of the armrest support shaft (9), support base (3) to the backrest support shaft directed in the lateral direction provided I also (8), provided to be tilted in the longitudinal direction support base (3) Yes.
[0011]
Armrest support shaft (9), as shown in FIG. 2, the support base side edge and the leg mounting portion which is upwardly projected at that little internal side of (3) (10) and the armrest supporting lifting bearing (41) in, it disposed through the bearing hole (24) (42).
[0012]
The backrest support shaft (8) is pivotally supported by bearings (36) and (36) provided on the upper surface of the support base ( 3 ) on the inner side of the armrest support shaft ( 9 ) .
The bearings (36) and (36) are paired on the left and right sides, are formed in a U-shape when viewed from the side, have an upper opening, and the back support shaft (8) does not come out upward at the upper opening edge. as such, I also bolts (45) (45), fastened securely locking piece (40) is mounted.
[0013]
A leg receiving step (54) is formed in the lower part of the outer surface of the armrest ( 7 ), and a recess is formed on the upper surface of the support base ( 3 ) between the leg mounting part (10) and the armrest support bearing (41). (55) is provided.
[0014]
As shown in FIG. 1, the armrest support shaft (9) and the backrest support shaft (8) have four (not shown in the figure) for convenience, but the axes are aligned and left and right on the support base (3). Arranged in the direction.
Therefore, the upper end of the armrest (7) is attached to an intermediate portion of the backrest (6), the backrest (6) and armrests (7) are you tilted integrally longitudinal direction.
[0015]
In view of the fact that the four armrest support shafts (9) and the backrest support shaft (8) are arranged in the left-right direction on the support base (3) with their axes aligned , a total of four armrests are provided. the support shaft (9) and the backrest support shaft (8) may be a single shaft.
[0016]
Next, with reference to FIG. 3, the structure of the part which an armrest (7) and a leg (2) oppose is demonstrated.
The upper end surface (2a) of the leg (2) is formed in an arc shape centered on the armrest support shaft (9).
On the outside of the lower (7a) of the armrest (7), the leg receiving Re stepped portion for receiving the upper end surface (2a) of the legs (2) (54) is formed, the outer surface of the leg (2) and armrests ( The outer surface of 7) is almost the same surface.
[0017]
On the upper end surface (2a) of the leg (2), there is a groove (38) for receiving the protruding portion (37a) which is the lower portion of the U-shaped leg engaging metal fitting (37) with the upper portion embedded in the armrest (7). ) Is formed. Longitudinal length of the groove (38) is a length to allow tilting of the longitudinal direction of the backrest (6).
[0018]
Alternatively, the leg engagement fitting (37) may be formed on the upper end surface (2a) of the leg (2), and the groove (38) may be formed on the armrest (7).
[0019]
Next, the order in which the legs, the armrests, the backrest, and the decorative cover are attached to the support will be described.
[0020]
As shown in FIG. 2, first, the leg mounting portion (10) of the support base (3) is fitted into the recesses (11) provided on both sides of the upper end of the leg (2), and the leg mounting portion (10 a), provided with outward projecting portions (12), the recess (11) in the fitted in the lateral direction of the through hole (13) provided, the outward protrusion (12) internally threaded hole drilled from the outer surface of (14) headed tighten the screws (15) to, by its head (15a), a recess (11) of the bottom (31) and armrest support bearing and the outward projecting wall (21) at the leg mounting portion (10) (22 ) And press.
Thereby, the leg (2) is attached to the support base (3).
[0021]
Since the recess (11) is formed on both sides of the upper part of the leg (2), the leg (2) is not limited to the right side and the left side, and is attached to both sides of the support base (3). Can do.
[0022]
Thereafter, as shown in FIG. 1, an armrest (7) and the backrest support shaft provided in the lower portion (6a) of the integrated backrest (6) to (8), side view the U-shaped bearing ( 36) (after insertion from above 36), bearings (36 to the upper opening of), the bolt (also attached to me receiving piece (40) 45), backrest support shaft (8) bearing (36) So that it does n’t come off.
[0023]
On the other hand, as shown in FIG. 2, the lower end (7 a) of the armrest (7) is recessed between the armrest support bearings (22) and (41) while the leg engagement fitting (37) is engaged with the groove (38). after elaborate dropped to 55), and armrest support shaft through-hole (32), to a shaft receiving hole (24) (42), the collar (43) with armrest support shaft (9) is passed through from the outer side, the armrest support A retaining ring (44) is attached to the inner end of the shaft (9).
[0024]
Finally, the decorative cover (33) is fitted into the recess (11), the projecting shaft (34) is press-fitted into the cover mounting hole (35), and attached to the leg (2).
Decorative cover (33), after being mounted, be pressed from the outside, because it has a projecting shaft (34), it is not as dented.
[0025]
As shown in FIG. 5, the backrest (6) is connected to the rear portion of the seat (5) by a pair of left and right connecting pieces (39) (one is not shown).
[0026]
Further, the backrest (6) contacts the rear end of the torsion bar (4) from above with a pair of left and right pressing pieces (46) (one not shown) provided rotatably on the backrest (6). Let it be connected to the torsion bar.
[0027]
Seated person and rests against the backrest (6), the backrest (6) is Ko傾centered backrest support shaft (8), an armrest (7), the central armrest support shaft (9) When the leaning back and the leaning force against the backrest (6) are balanced with the elasticity of the torsion bar (4), the backrest (6) can stop the backward leaning and take an easy posture. .
[0028]
Moreover, since the backrest (6) and the armrest (7) are tilted together, the seated person does not feel uncomfortable.
[0029]
A modification of the leg is shown in FIG.
This leg (51) is integrated with a support rod (52) attached to the support base (3) by a U-shaped landing piece (53) that is reversely forward-facing in plan view. The support rod (52) also has recesses (11) on both sides of the upper portion. Further, the upper surface (51a) is also formed in an arc shape with the armrest support shaft (9) as the center.
[0030]
【The invention's effect】
According to the invention of claim 1, the pivot position of the backrest relative to the support base, so are matched in the horizontal direction and the pivot position of the armrest relative to the support base, also armrests of the upper is attached to the backrest , The backrest and armrest are not tilted together and separated from each other. For this reason, it does not give an uncomfortable feeling to the person sitting on the chair.
[0031]
As in the invention of claim 2, the lower part of the armrest is inserted into the recess between the pair of left and right armrest support bearings formed respectively on the left and right sides of the support base, and the pair of armrest support bearings and the lower part of the armrest are connected to each other. By penetrating the armrest support shaft, the armrest can be attached to the support base in a tiltable manner without any difficulty.
[0032]
As in the invention of claim 3, when the upper end surface of the leg is formed in an arc shape centered on the pivoting portion of the armrest and the leg receiving step is formed on the outer side of the lower portion of the armrest, the upper portion of the leg and the armrest As a result, the seated person's clothes are not caught in the gap, and a chair with excellent safety can be obtained. Moreover, the side of the leg and the side of the armrest can be flush with each other to improve the appearance of the chair.
[0033]
As in the invention of claim 4, the projecting portion facing the vertical direction on one of the opposing portions facing each other in the vertical direction between the upper end surface and the armrest of the leg receiving stepped portions of the leg is provided, grooves for receiving the projecting portion on the other Providing the armrest prevents the armrest and the leg from protruding from the side of the chair.
[Brief description of the drawings]
Figure 1 is a half of the longitudinal cross-sectional front view taken along the backrest support shaft and the armrest support shaft chair embodiment of the present invention, in FIG. 5 is a sectional view taken along line I-I.
FIG. 2 is an enlarged cross-sectional view of a portion where a leg is attached to a support base in FIG.
FIG. 3 is a perspective view of a part of a side portion of a support base, a leg, an armrest, and a decorative cover.
FIG. 4 is a side view of the chair with the backrest standing upright.
[5] seat support base, a vertical cross-sectional side view of the lower portion of the backrest.
FIG. 6 is a perspective view of a leg according to another embodiment.
[Explanation of symbols]
(1) Chair
(2) Leg
(2a) Upper end surface
(3) Support base
(4) Torsion bar
(5) Seat
(6) Backrest
(6a) under section
(7) Armrest
(7a) under section
(8) Back support shaft
(9) Armrest support shaft
(10) Leg mounting part
(11) Recess
(12) Outward protrusion
(13) Through hole
(14) Female thread hole
(15) Headed screw
(15a) head section
(21) Outward projecting wall
(22) Armrest support bearing
(24 ) Bearing hole
(31) Bottom
(32) Armrest support shaft through hole
(33) Cosmetic cover
(34) Projection shaft
(35) Cover mounting hole
(36) Back support shaft bearing
(37) Leg engagement bracket
(37a) Projection
(38) Groove
(39) Connecting piece
(40) Receiving piece
(41) Armrest support bearing
(42) shaft receiving hole
(43) 鍔
(44) Retaining ring
(45) Bolt
(46) Pressing piece
(51) Leg
(51a) Top surface
(52) Support rod
(53) Landing piece
(54) leg acceptance Re stepped portion
(55) recess

Claims (4)

Bridges the top of the pair of left and right legs, the support base seat at the top that is placed in the rear tiltable pivotally attached to the chair backrest,
The lower part of the backrest is pivotally attached with the backrest support shaft facing in the left-right direction slightly inside the both side end portions of the support base, and the rear portion is attached to the backrest at both side end portions of the support base. An armrest device for a chair, characterized in that a lower part of the armrest is pivotally attached with an armrest support shaft facing in the left-right direction and having an axial center coinciding with the backrest support shaft and connecting the support base and the leg .   An armrest lower shaft is inserted into a recess between a pair of left and right armrest support bearings formed on the left and right sides of the support base, and an armrest support shaft is passed through the pair of armrest support bearings and the armrest lower portion. The chair armrest device according to claim 1. Forming an upper end surface of the leg in an arcuate shape around the armrest pivot portion, the armrest device for a chair armrest according to claim 1, wherein the formation of the leg receiving Re stepped portion on the outer portion of the lower. The one of the opposing portions facing each other in the vertical direction between the upper end surface and the armrest of the leg receiving Re stepped portion of the leg, the projecting portion facing the vertical direction is provided, according to claim 3 provided with a groove for receiving the projecting portion on the other Chair armrest device.

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