JP5059814B2 - Chair armrest mounting device - Google Patents

Description

  The present invention relates to an apparatus for easily and firmly attaching an armrest to a chair.

  FIG. 11 shows a conventional general chair with an armrest, (1) is a leg, (2) is a seat, and (3) is provided at the upper end of the leg (1) and supports the seat (2). A support base, (4) is a backrest, (5) is an armrest, and (6) is an armrest strut whose upper part is substantially vertical and whose lower part curves inward. The armrest (5) has an inward end (6a) at the lower end of the armrest strut (6) with the upper end fixed at the center of the lower surface, and the lower surface of the support base (3) or the lower surface of the seat (2) from below. It is attached to the support base (3) or the seat (2) by screwing with the mounting bolt (7).

  Moreover, although the patent document 1 and the patent document 2 have also described the same armrest attachment apparatus, both are bolting the inward part of an armrest support | pillar from the downward direction of a support base or a seat, and a basic structure. It has become.

Japanese Patent Laid-Open No. 10-127410 Japanese Patent Laid-Open No. 10-117883

In the conventional chair shown in FIG. 11, when the armrest strut (6) is attached to the support base (3) or the seat (2), the upward mounting bolt (7) is placed in a narrow space below the seat (2). Positioning and tightening work must be performed, and an unreasonable posture is required, and workability during assembly is poor.
In addition, when a seated person leans on the armrest and a large load is applied, the load is increased as it is or by the lever principle, and acts on the mounting bolt (7) in the direction of falling off. If a strong mounting bolt (7) is not used, the bolt may fall off or break.
The same applies to those described in Patent Documents 1 and 2.

  In view of the above-mentioned problems of the prior art, the present invention can easily perform armrest mounting work in an easy working posture, and a large downward load on the armrest is directly applied to the mounting bolt. An armrest mounting device for a chair that does not hang and acts on the mounting bolt only as a tensile stress in the axial direction through the joint portion between the armband and the armrest strut, so that the armrest can be firmly attached. It is intended to provide.

According to the present invention, the above problem is solved as follows.
(1) The inward portion is formed by curving the lower end portion of the armrest strut supporting the armrest inward, and the inward portion is opened outward and downward , and the connecting bolt An insertion hole through which the enlarged diameter head can be inserted and a through hole having a diameter smaller than the enlarged diameter head are drilled on the same axis facing the left-right direction, and the enlarged diameter head of the connecting bolt is formed in the insertion hole. By fitting the male screw part provided at the tip part of the connecting bolt into the screw hole facing the outer side provided below the seat of the chair. Attach the armrest post.

With such a configuration, the bolting operation can be performed using a wide space on the side of the chair, so that it can be easily performed in an easy posture.
Further, the enlarged head portion of the connecting bolt fits into the insertion hole provided in the inward portion formed by bending the lower end portion of the armrest strut inward and does not protrude to the outside, so the appearance is good .

  (2) In the above item (1), a closing member for closing the opening portion is detachably provided in the insertion hole opened on the outer side surface of the armrest strut.

  With such a configuration, it is possible to improve the appearance by completely concealing the enlarged head of the connecting bolt.

  According to the present invention, the armrest can be easily attached in an easy working posture, and a large downward load on the armrest is not directly applied to the attachment bolt, so that the armrest and the armrest strut can be joined. It is possible to provide an armrest mounting device for a chair that acts on the mounting bolt only as a tensile stress in the axial direction through the portion, so that the armrest can be firmly mounted.

It is a front view of a chair provided with the reference example of an armrest attachment apparatus . It is a side view similarly. It is an expanded sectional view which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a front view of a blocking member. It is a side view similarly. It is a principal part exploded perspective view of a chair provided with one embodiment of the present invention. It is an enlarged front view of the principal part. It is a cross-sectional plan view which follows the IX-IX line of FIG. FIG. 10 is a sectional view taken along line XX in FIG. 9. It is a front view of the conventional armchair.

FIGS. 1-6 shows the chair provided with the reference example of an armrest mounting apparatus, and attaches | subjects the same code | symbol to each member same in FIG. 10, and abbreviate | omits description.

  The tip of the armband (8) extending outward from both side surfaces of the support base (3) immediately below the seat (2) has a hollow rectangular tube shape, and is on the central axis in the base end. The screw hole (9) is drilled, and the front end surface of the armband (8) is a convex surface (10) that is laterally angled from the front when the center ridge line facing in the front-rear direction protrudes outward.

  The central part of the lower surface of the armrest (5) on both sides of the seat (2) is supported by the upper end of the straight tubular armrest strut (11) facing up and down, and the lower part of the opposite surface of each armrest strut (11) A tubular inwardly facing portion (11a) facing the surface is provided continuously, and a V-groove-shaped concave surface (12) facing in the front-rear direction which is substantially complementary to the convex surface (10) is formed at the inner end thereof. An engagement plate (13) bent in a letter shape is fixed.

  On the axis of the inward portion (12) on the inner wall of the engagement plate (13) and the armrest strut (11), the shaft portion (14a) has a larger diameter than the shaft portion (14a) of the connecting bolt (14) described later. ) Has a smaller diameter through-hole (15) than the enlarged-diameter head (14b) connected to the base end.

  An insertion hole (16) that is coaxial with the through hole (15) and has a diameter larger than that of the enlarged diameter head (14b) is formed in the outer wall of the support column (11).

  In the above-described apparatus, the concave surface (12) of the engagement plate (13) is fitted to the convex surface (10) of the armband (8), and then the connecting bolt (14) is inserted into the through hole (15) from the insertion hole (16). The male screw part (14c) formed at the tip of the shaft part (14a) is screwed into the screw hole (9), and then a tool (not shown) is inserted through the insertion hole (16) and screwed firmly. Then, the enlarged head (14b) of the connecting bolt (14) presses the inner surface of the armrest strut (11), and the engagement plate (13) is pressed against the convex surface (10) at the tip of the armrest (8). Therefore, the armrest strut (11) is firmly fixed to the armband (8). The opening at the lower end of the armrest strut (11) and the insertion hole (16) are obstructed by the closing member (17).

  5 and 6 show the closing member (17), and the armrest is placed on the upper surface of a synthetic resin inverted arm-shaped closing lid (18) having the same outer shape as the lower end surface of the armrest support (11). A plurality of inwardly elastically deformable fitting pieces (19) that can be fitted into the opening at the lower end of the support post (11) are projected, and elastically deformable at the peripheral edge of the closing lid (18). The upward closing piece (20) protrudes integrally, and a slightly thick circular engagement protrusion (21) that can be fitted into the insertion hole (16) is provided on the inner surface of the upper end. .

  When the fitting piece (19) of the closing member (17) is inserted into the opening at the lower end of the armrest strut (11) from below, the engagement protrusion (21) of the closing piece (20) is inserted into the insertion hole (16). With the elastic engagement, the closing member (17) is prevented from coming off from the armrest strut (11), and the insertion hole (16) is concealed with good appearance.

The closing piece (20) in the closing member (17) of the reference example is in contact with the outer side surface of the support column (11), and the insertion hole (16) is closed from the outside by the locking projection (21). However, the closing piece (20) protrudes from the closing lid (18) so as to come into contact with the inner surface of the outer wall of the support column (11), and the outer surface is fitted into the insertion hole (16) from the inside. A mating engagement protrusion (21) may be provided.

  Further, instead of the circular engagement protrusion (21) provided on the closing piece (20), a protrusion that can be simply locked to the lower end edge of the insertion hole (16) may be used.

7 to 9 show a chair provided with an embodiment of the present invention.
In addition, about the same member in the said reference example , it attaches | subjects the same code | symbol and abbreviate | omits detailed description.

In this embodiment, at the tip of the armband (30) (the left one is not shown) extending outward from both side surfaces of the support base (3), the ridge line of the central portion facing upward and downward A convex surface (31) having a mountain shape in a plan view projecting outward is formed, and a cylindrical projecting portion (threaded hole (32) is bored in the center of the ridge line of the convex surface (31) ( 33) is formed.
On both side surfaces of the support base (3), inclined surfaces (3a) that are inclined upward and outward are formed.

  The armrest strut (34) that supports the armrest (5) is integrally formed with the armrest (5) by a hard synthetic resin material, and inwardly curves inwardly at the lower end. Part (34a).

  The tip surface of the inward portion (34a) is in close contact with the inclined surface (3a) of the support base (3) or in parallel with each other with a minute gap in the mounted state of the armrest strut (34). An inclined surface (35) is provided.

  At the center of the tip of the inward portion (34a), the armband (30) can be fitted, and at the back end, V is oriented in a vertical direction that is substantially complementary to the convex surface (31) of the armband (30). A concave portion (37) having a groove-like concave surface (36) is provided.

In the center of the concave surface (36), an enlarged hole (38) into which the protrusion (33) at the tip of the armband (30) can be fitted, a through hole (39) having a smaller diameter, and a through hole (39) An insertion hole (40) having a larger diameter and opening outward and downward in the bent portion of the armrest strut (34) is continuously drilled on a substantially horizontal straight line.

  To attach the armrest strut (34) to the chair, first, the projection (33) of the armrest (30) is fitted into the enlarged hole (38) of the armrest strut (34), and the concave surface (36) is convex. (31) so that the recess (37) is externally fitted to the armband (30), and then the shaft (14a) of the connecting bolt (14) is inserted from the insertion hole (40) to the through hole (39). The male screw part (14c) is screwed into the screw hole (32) and tightened.

  Thereafter, a detachable closing member (41) is attached to the insertion hole (40) to conceal the enlarged diameter head (14b) of the connecting bolt (14).

  When the connecting bolt (14) is tightened, the convex surface (31) and the concave surface (36) are securely positioned and in close contact with each other, and the armrest strut (34) is firmly fixed to the armband (30).

  When a large downward load is applied to the armrest (5), the load first acts on the joint surface between the convex surface (31) and the concave surface (36), and only the tensile stress in the axial direction is applied to the connecting bolt (14). Therefore, there is little possibility that the connecting bolt (14) bends or comes off.

In addition, when the inclined surface (35) of the armrest strut (34) is in contact with the inclined surface (3a) of the support base (3), the armrest strut (34) is strongly prevented from trying to rotate outward and downward. Is done.
In addition, this invention is not limited only to the said embodiment, Many change deformation | transformation is possible.
For example, the convex surfaces (10) and (31) are provided on the armrest strut (34) side, and the concave surfaces (12) and (36) are provided on the armrests (8) and (30) side so that they can be fitted together and connected. You may screw with a bolt.
Further, the ridge lines of the convex surfaces (10) and (31) and the concave grooves may be directed obliquely forward front or rear upper or the like.

(1) Leg
(2) Seat
(3) Support base
(3a) Inclined surface
(4) Backrest
(5) Armrest
(6) Armrest strut
(6a) Inward facing part
(7) Mounting bolt
(8) Arms
(9) Screw hole
(10) Convex surface
(11) Armrest strut
(11a) Inward part
(12) Concave
(13) Engagement plate
(14) Connecting bolt
(14a) Shaft
(14b) Expanded head
(14c) Male thread
(15) Through hole
(16) Insertion hole
(17) Closure member
(18) Closure lid
(19) Mating piece
(20) Blocking piece
(21) Engagement protrusion
(30) Arms
(31) Convex surface
(32) Screw hole
(33) Projection
(34) Armrest strut
(34a) Inward portion
(35) Inclined surface
(36) Concave
(37) Recess
(38) Enlarged hole
(39) Through hole
(40) Insertion hole
(41) Closure member

Claims (2)

An inward portion is formed by bending the lower end portion of the armrest strut supporting the armrest inward, and the inward portion is opened outward and downward , and the diameter of the connecting bolt is increased. An insertion hole through which the head can be inserted and a through hole having a diameter smaller than that of the enlarged head are formed on the same axis in the left-right direction, and the enlarged head of the connecting bolt is fitted into the insertion hole. Thus, the armrest is inserted by screwing the male screw portion provided at the tip of the connecting bolt through the shaft portion into the through hole and facing outwardly provided at the lower side of the chair seat. An armrest mounting device for a chair, characterized in that a column is attached.   The armrest attachment device for a chair according to claim 1, wherein a closing member for closing the opening portion is detachably provided in an insertion hole that opens on an outer surface of the armrest column.

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