JP2007325696A - Armrest frame attaching structure in chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To strongly and stably attach the inner side end face of an armrest frame to the outer side end face of an armrest frame attaching part. <P>SOLUTION: At least a pair of front and back recessed parts 15 are provided on an outside end face of the armrest frame attaching part 18 and projection parts 19 to be the complements of the recessed parts 15 and fitted to them are provided on an inside end face of the inward bent part 13a of the armrest frame respectively. In the state of fitting the recessed parts 15 to the projection parts 19, the armrest frame attaching part 18 and the inward bent part 13a of the armrest frame are fixed by a connecting bolt 21 directed to the longitudinal direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an armrest frame mounting structure in a chair, and in particular, to an outer end surface of an armrest frame mounting portion and an inner end surface of an armrest frame standing upright from a side of a seat body.

The applicant of the present application provides an armrest frame mounting portion on the horizontal portion of the back support heel so as to face outward, and the opposing surface between the outer end surface of the armrest frame mounting portion and the inner end surface of the armrest frame is mutually attached. In the state where a convex portion and a trough-shaped concave portion, and a protruding portion and an engaging hole are fitted to each other by forming a complementary shape and they are fitted to each other, the lower end of the armrest frame is attached to the armrest frame mounting portion by a connecting bolt. A mounting structure to be mounted has been devised, and a patent application has been filed first (for example, see Patent Document 1).
JP 2004-49735 A

  In the armrest frame mounting structure described in the above-mentioned patent document, the connecting portion between the armrest frame mounting portion and the armrest frame has a bowl shape with a relatively small front-rear dimension, and also has a mountain-shaped convex portion and a valley shape. Since the recesses are continuously fitted in the vertical direction and are connected to each other by the connecting bolt at the ridge line portion, a bending load due to the rotational moment in the front-rear direction acting on the armrest frame is directly applied to the connecting bolt, The downward load applied to the armrest frame and the load to tilt the armrest frame back and forth are also directly applied to the connecting bolts and pin-shaped protrusions, leaving problems with the armrest frame stability and mounting strength over long-term use. It had been.

  The present invention has been made in view of the above problems, and the inner end surface of the lower end of the armrest frame is prevented from being directly applied to the connecting bolt or the like on the outer end surface of the armrest frame mounting portion, thereby being strong and stable. It is an object of the present invention to provide an armrest frame mounting structure in a chair that can be mounted on a chair.

According to the present invention, the above problem is solved as follows.
(1) In an armrest frame mounting structure in a chair in which an inner end surface of a lower end portion of an armrest frame facing upward is attached to an outer end surface of an armrest frame mounting portion provided on a side portion of a chair body, One of the outer end surface and the inner end surface of the armrest frame is provided with at least a pair of front and rear projections, and the other is provided with a concave portion that forms a complementary shape with the projection and opens to the side. The armrest frame mounting portion and the armrest frame are fixed with connecting bolts facing in the left-right direction, with each provided and with the recesses fitted into the protrusions.

(2) In the above item (1), when the concave portion is provided on the inner end surface side of the armrest frame, it opens also downward, and when it is provided on the outer end surface of the armrest frame mounting portion, it also opens upward And

(3) In the above item (1) or (2), the armrest frame mounting portion has a rectangular parallelepiped shape that is long in the front-rear direction, and the lower and rear dimensions of the armrest frame mounting portion in which the lower end portion of the armrest frame is the rectangular parallelepiped shape The front and rear width and thickness are substantially equal to the vertical dimension, and the inner end surface of the armrest frame is brought into contact with and fixed to the entire outer end surface of the armrest frame mounting portion.

(4) In any one of the above items (1) to (3), the front and lower ends pivot on the side of the support base that supports the seat so that the armrest frame mounting portion can be tilted rearwardly behind the seat. Provided in the lower forward arm of the worn back support heel.

(5) In any one of the above items (1) to (4), an insertion hole through which the shaft portion of the connection bolt is inserted is inserted into one of the protrusion and the recess, and the connection bolt is screwed into the other. Each screw hole is provided.

(6) In any one of the above items (1) to (5), the armrest frame is provided with an insertion hole through which the shaft portion of the connecting bolt is inserted and an enlarged diameter hole that opens outwardly through which the head portion of the bolt is inserted. Provide.

(7) In any one of the above items (1) to (6), the upper part of the armrest frame has a substantially rhombus shape when viewed from the side.

  According to the first aspect of the present invention, the downward load applied to the armrest frame, the load for tilting the armrest frame in the front-rear direction, and the bending load due to the rotational moment in the front-rear direction acting on the mounting portion are And is not received directly by the connecting bolt or the female screw hole as in the prior art. Therefore, the armrest frame is firmly and stably attached over a long period of time.

  According to invention of Claim 2, a protrusion and a recessed part can be easily fitted only by moving an armrest frame below from the upper direction.

  According to the invention of claim 3, the rigidity of the armrest frame mounting portion is increased, the contact area with the inner end surface of the armrest frame is large, and the strength against the rotational moment in the front-rear direction is improved. The armrest frame is attached more firmly and stably, and in particular, there is no risk of wobbling in the front-rear and up-down directions.

According to the invention of claim 4, since the vertical dimension of the armrest frame can be made small, the rotational moment acting on the mounting portion is also reduced, and the stability is improved.
In addition, the armrest frame also tilts backwards in conjunction with the back tilt of the back support heel, so that the feeling of elbow contact is good and the sitting comfort is improved.

  According to the fifth aspect of the present invention, since the fitting portion between the protrusion and the recess is directly tightened by the connecting bolt, their fitting strength is increased.

  According to the sixth aspect of the present invention, even if the connecting bolt is inserted from the outside of the armrest frame, the head portion of the bolt is inserted into the enlarged diameter hole that opens to the outside of the armrest frame, and is not exposed to the outside. So it looks better.

  According to the seventh aspect of the invention, the rigidity of the armrest frame is increased, there is no profound feeling when viewed from the side, and the appearance is good.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a reclining chair to which the present invention is applied, and FIG. 2 is a side view of the same. The chair includes a leg (2) with casters (1) and a pedestal (3) ), A support base (5) attached to the upper end of the support base (4), and front and lower ends pivoted to the left and right sides of the support base (5). A backrest support rod (6) made of an aluminum alloy or the like that can be tilted backward by a reclining mechanism (not shown), and a backrest (7) attached to the front surface, as well as a lower end portion of the backrest support rod (6) And a pair of left and right armrests (8) and (8) attached by connecting bolts (21) described later.

  The backrest support ridge (6) is a pair of left and right (only one shown) that stands up behind the seat (4) and has a forward arm (9a) inclined obliquely rearward and upward at the lower end. It consists of a side support rod (9) and an upper support rod (10) that joins the upper ends of both side support rods (9), and the overall shape is substantially U-shaped in the front-rear view.

  The front part of the seat body (4) is pivotally attached to the front part of the support base (5) with a pair of left and right support links (11), and the rear part of the seat body (4) is the left and right side support rods. The seat (4) is pivotally attached to the bearing piece (12) projecting upward at the front end of the forward arm (9a) of (9) and in conjunction with the tilting of the backrest support rod (6). It can be tilted rearward and downward.

  As shown in FIGS. 3 to 5 (only one is shown for left-right symmetry), the armrest (8) has a generally rhombic frame shape in side view, and is wide and thick in the front-rear direction at the lower end. An armrest frame (13) made of an aluminum alloy or the like having an inwardly bent portion (13a) having an inward L-shape and an armrest (14) attached to the upper end surface thereof and facing in the front-rear direction, ) And the backrest (7) are attached to the backrest support ridge (6) by connecting bolts (21) which will be described later.

  As shown in FIG. 4, the inner end surface of the inwardly bent portion (13 a) of the armrest frame (13) has a curved surface having an upward arc-shaped upper surface, and the inner surface and the lower end are opened downward. Two U-shaped concave portions (15) and (15) are formed.

  On the outer surface of the lower end of the inwardly bent portion (13a), there are two front and rear expansions that open to the outside where the heads of two connecting bolts (21) for mounting an armrest frame (13) described later can be inserted. Diameter holes (16), (16), and at the back of them, through holes (17), (17) that open in the recesses (15) and face in the left-right direction for inserting the shaft portion of the bolt, It is drilled so as to communicate with the diameter-expanded hole (16).

  On the upper surface behind the bearing piece (12) in the front arm (9a) of the left and right side support rods (9), the front and rear dimensions and the vertical dimension are the front and rear width and thickness of the bent part (13a). The cuboid mounting part (18) facing in the front-rear direction, which is almost equal to, is connected to the bearing piece (12) and protrudes slightly outward from the side surface of the forward arm part (9a). Projected upward.

  On the outer end face of this mounting part (18), two concave parts (15) are formed in a shape complementary to that of the concave part (15) from above so as to form a U-shaped front and back side view. The protrusions (19) and (19) are integrally projected. In the upper part of each protrusion (19), a female screw hole (20) (20) facing in the left-right direction is concentrically aligned with the insertion hole (17) provided in the inwardly bent portion (13a). Is provided.

  In order to attach the armrest frame (13) of the armrest (8) to the attachment portion (18) of the left and right side support rods (9) of the backrest support rod (6), first the inside of the inward bent portion (13a) The front and rear recesses (15) and (15) provided on the end surface are fitted into the front and rear projections (19) and (19) protruding from the outer end surface of the mounting portion (18) from the upper side or fitted sideways. It fits more and keeps the state of positioning in the front-rear direction and the vertical direction.

  Then, from the outside of the inwardly bent portion (13a), two hexagon socket head connecting bolts (21) and (21) are passed through the enlarged diameter hole (16) provided in the inwardly bent portion (13a). Insert into the insertion holes (17), (17), and screw into the screw holes (20) to be provided on the protrusions (19) and tighten.

Thereby, the inner end surface of the lower end of the inwardly bent portion (13a) in the armrest frame (13) is firmly and stably attached to the outer end surface of the attachment portion (18).
That is, the downward load applied to the armrest (8), the load to tilt the armrest (8) in the front-rear direction, the bending load due to the rotational moment acting in the front-rear direction acting on the mounting portion of the armrest (8), etc. 15) and the protrusion (19) are received and are not directly applied to the connecting bolt (21) and the female screw hole (20), thereby increasing the connecting strength.

  Further, the inwardly bent portion (13a) and the mounting portion (18) are relatively long in the front-rear direction and are thick so that the contact area between them is large, and the recess (15) and the protrusion (19) Since the armrests (8) are provided apart from each other in the front-rear direction, there is no fear that the mounting portion of the armrest (8) will wobble in the front-rear and up-down directions, and the armrest (8) can be attached stably.

  In the above-described embodiment, the recess (15) is provided on the inwardly bent portion (13a) side of the armrest frame (13), and the protrusion (19) is provided on the mounting portion (18) side of the backrest support rod (6). On the contrary, as shown in FIG. 6, a recess (15) having an upper end and an outer surface opened and having a female screw hole (20) is provided on the attachment portion (18) side, as shown in FIG. On the side of the inwardly bent portion (13a) of the armrest frame (13), a projection (19) having a recess (15) and a complementary shape and having an insertion hole (17) is provided, and the insertion hole (17) is provided. The armrest frame (13) may be attached to the attachment portion (18) by screwing the connecting bolt (21) inserted from the outside into the female screw hole (20).

  Moreover, in the said embodiment, although the attaching part (18) of the armrest frame (13) is provided in the backrest support collar (6) which is a chair main body side, the other chair main body side, for example, a leg (2), is provided. May be provided on the outer surface of the support base (5) which is substantially integrated with the outer surface of the seat body (4).

Further, in the above embodiment, the connecting bolt (21) is inserted from the armrest frame (13) side and screwed to the mounting portion (18) side. It may be inserted further and screwed into the inner surface of the armrest frame (13).
There may be two or more recesses (15) and protrusions (19).

It is a front view of the chair to which this invention is applied. Similarly, it is a side view. It is the perspective view of the principal part which looked at the state before armrest frame attachment from the diagonal front side. Similarly, it is the perspective view of the principal part which looked at the state before armrest frame attachment from diagonally forward inner side. It is a front perspective view of the principal part after armrest frame attachment. It is a perspective view which shows the modification which provided the recessed part in the attachment part side, and provided the protrusion in the armrest frame side.

Explanation of symbols

(1) Casters
(2) Leg
(3) pedestal
(4) Seat
(5) Support base
(6) Back support heel
(7) Backrest
(8) Armrest
(9) Side support rod
(9a) Front arm
(10) Upper support rod
(11) Support link
(12) Bearing piece
(13) Armrest frame
(13a) Inward bending
(14) Elbow rest
(15) Recess
(16) Expanded hole
(17) Insertion hole
(18) Mounting part (armrest frame mounting part)
(19) Projection
(20) Female thread hole
(21) Connecting bolt

Claims (7)

In the armrest frame mounting structure in the chair in which the inner end surface of the lower end portion of the armrest frame facing upward is attached to the outer end surface of the armrest frame mounting portion provided on the side of the chair body,
At least one pair of front and rear projections on one of the outer end surface of the armrest frame mounting portion and the inner end surface of the armrest frame, and on the other side, a side that is complementary to the projection and can be fitted thereto The armrest frame in the chair is characterized in that the armrest frame mounting portion and the armrest frame are fixed with connecting bolts facing in the left-right direction in the state where the recesses that open to the sides are respectively provided and the recesses are fitted to the protrusions. Mounting structure.   The armrest in a chair according to claim 1, wherein when the recess is provided on the inner end face side of the armrest frame, it opens also downward, and when it is provided on the outer end face of the armrest frame mounting part, it also opens upward. Frame mounting structure.   The armrest frame mounting portion has a rectangular parallelepiped shape that is long in the front-rear direction, and the lower end portion of the armrest frame is formed to have a front-rear width and thickness that are substantially equal to the front-rear dimension and the vertical dimension of the armrest frame mounting portion that is a rectangular parallelepiped shape, The armrest frame mounting structure for a chair according to claim 1 or 2, wherein an inner end surface of the armrest frame is brought into contact with and fixed to the entire outer end surface of the armrest frame mounting portion.   The armrest frame mounting portion is provided on the lower front arm portion of the backrest support rod whose front and lower ends are pivotally attached to the side portion of the support base that supports the seat body so that the armrest frame can be tilted rearwardly. The armrest frame mounting structure in the chair according to any one of claims 1 to 3.   The insertion hole through which the shaft portion of the connection bolt is inserted is provided in one of the protrusion and the recess, and the female screw hole into which the connection bolt is screwed is provided in the other, respectively. Armrest frame mounting structure in the described chair.   The armrest frame in the chair according to any one of claims 1 to 5, wherein the armrest frame is provided with an insertion hole through which the shaft portion of the connecting bolt is inserted and a diameter-expanding hole that opens outwardly through which the head portion of the bolt is inserted. Mounting structure. The armrest frame mounting structure for a chair according to any one of claims 1 to 6, wherein an upper portion of the armrest frame has a substantially rhombus shape when viewed from the side. .

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