JP4571869B2 - Chair armrest mounting structure - Google Patents

Description

  The present invention relates to a mounting structure in which an armrest is attached to a horizontal frame in a chair in which the horizontal frame is horizontally mounted on left and right support legs.

As an armrest mounting structure of this type of chair, there is one described in Patent Document 1, for example.
Moreover, the chair provided with the horizontal frame which can attach an armrest is disclosed by patent document 2, for example.
JP 2000-197536 A Japanese Utility Model Publication No. 41-17624

In the conventional armrest mounting structure described in Patent Document 1, the lower end surface of the armrest is fitted to the upper half of a horizontal frame (horizontal ridge) that has a rhombus cross section that is horizontally mounted on the left and right legs. The armrest is attached so as to sandwich the horizontal frame by fixing the holding metal fitting fitted to the lower half of the horizontal frame and the lower part of the armrest with screws.
Therefore, there is a problem that it is difficult to position the armrest mounting position with respect to the horizontal frame.

  Further, in the case where the horizontal frame (seat connecting rod) is substantially cylindrical like the chair described in Patent Document 2, if the armrest is attached by the above-described clamping structure, it acts on the armrest. Due to the rotational moment, it may wobble in the front-rear direction around the horizontal frame.

  The present invention has been made in view of the above-described problems, and facilitates the positioning of the armrest mounting position with respect to the horizontal frame, and even when the horizontal frame having a cylindrical shape is used, the armrest can be firmly attached thereto. An object of the present invention is to provide an armrest mounting structure for a chair.

According to the present invention, the above problem is solved as follows.
(1) In a chair armrest mounting structure in which a metal horizontal frame to which a seat body can be mounted is mounted on the upper portions of the left and right support legs, and an armrest is mounted on the horizontal frame, one horizontal frame is provided. A support bracket with a U-shaped cross-section facing downward on the side view is attached to the upper surface of the horizontal frame, and the lower ends of the front and rear lower pieces thereof are brought into contact with the outer peripheral surface of the horizontal frame and fixed by welding. Provided on the lower end surface of the armrest on the support bracket , the rear end surface is a flat surface, and the upper end surface with the left and right widths substantially equal to the left and right dimensions of the support bracket and the flat end is the rear end surface. The horizontal frame and the lower end of the armrest are coupled to each other by a fixing means.

(2) In the above item (1), the horizontal frame is formed into a cylindrical shape, and a support metal fitting is straddled on the upper portion thereof and fixed by welding.

( 3 ) In the above item (1) or (2) , the recess of the armrest has a vertical dimension in which the support metal fitting is accommodated and a front-rear dimension to be fitted to the substantially upper half of the horizontal frame.

( 4 ) In any of the above items (1) to ( 3 ), the fixing means is a female screw hole facing the vertical direction provided at the lower end in the recess in the armrest, and the insertion hole provided in the horizontal frame and the support bracket. It is assumed that the upper end portion is composed of a bolt that is inserted from below into the female screw hole.

( 5 ) In the above item ( 4 ), a metal pipe-like spacer into which the screw portion of the bolt can be inserted is inserted into the insertion hole between the horizontal frame and the support metal fitting, and the lower end thereof is positioned at the lower end portion inside the horizontal frame. And the upper end thereof is fixed to the support fitting by welding.

According to the first aspect of the present invention, the concave portion on the lower surface of the armrest is fitted to the support fitting fixed to the upper surface of the horizontal frame by welding, and the horizontal frame and the lower end portion of the armrest are coupled by the fixing means. For this reason, positioning of the mounting positions of the front, rear, left and right of the armrest with respect to the horizontal frame becomes extremely easy.
Also, the support bracket is firmly fixed to the upper surface of the horizontal frame by welding , and the recess of the armrest is fitted to the upper surface of the support bracket , and the flat end face is brought into contact with the upper surface of the support bracket and fixed. because you are, even if the horizontal frame a circular cross-section, to one lateral frame of the armrest to be able to firmly fixed, there is no possibility to get graph in the longitudinal direction.
Furthermore, since the left and right widths of the recesses are substantially equal to the left and right dimensions of the support fitting, the mutual fixing area between the recess and the support fitting increases. Therefore, the armrest can be attached to the horizontal frame more stably without fear of wobbling in the left-right direction.

According to the second aspect of the present invention, even if the horizontal frame has a cylindrical shape, the support fitting can be firmly fixed to the upper portion thereof.
Moreover, since the protrusion dimension from the horizontal frame of a support metal fitting becomes small, the appearance when it sees from a side improves.

According to the third aspect of the present invention, since the support metal fitting is accommodated in the recess of the armrest and is not exposed to the outside, the appearance is improved.
Moreover, since the lower end part of an armrest is fitted to the upper half part of a horizontal frame, the appearance when it sees from the front-back and left-right direction becomes good.

According to the fourth aspect of the invention, it is easy to attach the armrest to the horizontal frame, and the bolts are screwed into the female screw holes from below, so that they are hardly visible from the outside, so that the appearance is improved.

According to the invention described in claim 5, since the lower end of the pipe-shaped spacer is located at the lower end inside the horizontal frame, even if the vertical dimension of the horizontal frame is large, the guide action by the spacer The bolt can be easily screwed into the female screw hole, and the head of the bolt is positioned below, so that it can be easily turned with a tool.
Moreover, since the head of the bolt can be accommodated inside the horizontal frame, it is not exposed to the outside, and the appearance is further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a front view of a lobby chair to which the present invention is applied, that is, a triple chair, FIG. 2 is an enlarged right side view, and FIG. 3 is an enlarged vertical side view taken along line III-III in FIG. Three identical chairs (2) having the same shape are attached to the upper part of the long leg frame (1).

  The leg frame (1) is horizontally mounted between a pair of left and right support legs (3) and (3) made of an aluminum alloy or the like, which are widened with an obtuse angle in the front-rear direction, and upper ends thereof. The support frame 3 is connected to the horizontal frame 4 as follows.

  As shown in FIGS. 3 and 4, the bottom surface of the left and right sides of the horizontal frame (4) to which the support leg (3) is attached has a box shape in which the left and right dimensions are larger than the front and rear dimensions and the upper surface is open. The mounting bracket (5) is fixed by welding all the front, rear, left and right contact portions with the horizontal frame (4) so that the lower part of the horizontal frame (4) is slightly fitted therein. Yes.

  At the upper end of the support leg (3), a box-like support portion (6) having an open upper surface, which can accommodate the mounting bracket (5) with a slight margin, is integrally formed.

  The dimension between the standing pieces (6a) and (6a) facing the front and rear of the support portion (6) is such that the horizontal frame (4) can be fitted from above, and the standing pieces (6b) (6b) ( At the upper end of 6b), a downward arcuate groove (7) is formed into which the substantially lower half of the horizontal frame (4) is fitted.

  The bottom plate (5a) of the mounting bracket (5) and the support substrate (6c) of the support portion (6) have four through holes (8) and stepped holes (9) arranged in the front, rear, left and right directions, respectively. A nut (10) is welded to the upper surface of the formation portion of each through hole (8) of the bottom plate (5a).

  The mounting bracket (5) is accommodated in the support portion (6) of the support leg (3), and the bottom plate (5a) is placed on the support substrate (6c), and the horizontal frame ( 4) After fitting the lower half, insert the hexagon socket bolt (11) inserted from below into the stepped hole (9) of the support substrate (6c) and the through hole (8) of the bottom plate (5a). Then, by screwing and tightening the nut (10), the lower surfaces of both side portions of the horizontal frame (4) are firmly coupled to the upper end of the support leg (3).

  A pair of left and right brackets (12) and (12) are fixed to the upper portion of the horizontal frame (4) for each chair (2).

  As shown in FIG. 3, each bracket (12) is inwardly facing the upper and rear ends of the vertical substrate (12a) facing the front and rear direction of a metal plate having a right triangle in which the upper side and the rear side are orthogonal to each other. The seat mounting piece (12b), which is bent at a right angle to the horizontal, and the back mounting piece (12c), which is substantially vertical below it, are integrally connected to each other. In the state where the upward arc-shaped concave groove (13) formed substantially at the center lower part in the front-rear direction of 12a) is fitted to the substantially upper half of the horizontal frame (4), the contact portions are welded to each other. It is fixed by. The corner where the rear end of the seat mounting piece (12b) and the upper end of the backrest mounting piece (12c) are orthogonal is also fixed by welding.

  On the upper surface of the seat mounting piece (12b) of the left and right brackets (12), the lower surfaces of both side end portions of the seat frame (16) of the seat body (15) having the seat cushion (14) mounted on the upper surface are inserted from below. Are fixed by a plurality of screws (17).

  Further, as shown in FIGS. 5 and 6, the left and right sides of the backrest (18) are shown on the rear surfaces of the backrest mounting pieces (12c) of the left and right brackets (12). The front face of the slightly thick inward mounting part (19a) formed at the lower end of the back frame (19) at both ends is the female screw hole (20) (20) The bolt (21) (21) inserted from the front of the backrest mounting piece (12c) is screwed and tightened so that the lower part of the back frame (19) is lower than the rear end of the seat (15). It is fixed so that it is located.

  In order to facilitate the mounting operation of the back frame (19), the locking means that engage with each other on the opposing surfaces of the backrest mounting piece (12c) and the inward mounting portion (19a), ie, FIG. As shown, a downward hook-like locking hook (22) projects from the front surface of the inward mounting portion (19a) of the back frame (19), and a slit-like engagement with the backrest mounting piece (12c). When the hole (23) is drilled and the locking hook (22) is engaged with the lower edge of the engagement hole (23), the bolt insertion hole (illustrated) drilled in the backrest mounting piece (12c) (Omitted) and the female screw hole (20) of the inward mounting part (19a) are aligned with each other, so that the bolt (21) of the bolt (21) can be used without other workers supporting the back frame (19) by hand. Tightening work can be easily performed by one person.

  Contrary to the above, the locking hook (22) is provided on the back surface of the back mounting piece (12c), and the engagement hole (23) is provided on the inward mounting portion (19a) of the back frame (19). May be.

  As shown in FIGS. 5, 6 and 8, the opposite sides of the upper and lower ends of the left and right back frames (19) are formed with opposite ends of pipe-shaped reeds (24) and (24) on both sides thereof. Therefore, the screw (25) is coupled by screwing a bolt (27) inserted from the outside into the stepped hole (26) of the back frame (19).

  As shown in FIGS. 9 and 10, an upper mounting portion (28a) in which a metal back plate (28) made of a punching plate is curled in a rearward arc shape at the upper end thereof is provided on the upper and lower reeds (24). ) And the lower mounting portion (28b) curled in a forward arcuate shape at the lower end, respectively, and the lower mounting surface (24). The upper and lower mounting portions (28a) and (28b) have the same curvature as the outer diameters of the upper and lower horizontal bars (24) and can be locked to them, for example, approximately 2 on the outer periphery of the horizontal bar (24). / 3 curled in an arc shape so that it can be fitted.

  Both side portions of the back plate (28) are fitted in concave grooves (29) formed on the opposing surfaces of the left and right back frames (19).

  The back plate (28) is pre-fitted to the upper and lower reeds (24) before the left and right back frames (19) are joined together by the upper and lower reeds (24).

  A back cushion (30) is attached to the front surface above the seat (15) of the back plate (28), and a headrest (31) made of a cushion material is attached to the upper end of the upper side ( 24) and the upper mounting portion (28a) of the back plate (28) fitted thereto are mounted so as to be wrapped from both the front and rear sides (see FIG. 9).

  As shown in FIGS. 11 and 12, the lateral frames (4) on both sides of the chair (2) are made of an aluminum alloy or the like having an inverted equilateral triangular shape with an elbow pad (32) attached to the upper surface. The following armrest (33) is attached as follows.

  On the upper surface of the attachment portion of each armrest (33) in the horizontal frame (4), a support metal fitting (34) having a U-shaped cross-section in a side view is substantially the same as the outer diameter of the horizontal frame (4). The contact portion between the front and back downward pieces (34a) and the horizontal frame (4) is fixed by welding.

  Insertion holes (35) and (35) which are aligned with each other are formed in the center portion of the support metal fitting (34) and the lateral frame (4) opposite to the center portion so as to penetrate in the vertical direction. ) Has a metal pipe-like spacer (36) facing the vertical direction through which the threaded portion of the bolt (40), which will be described later, can be inserted, and its upper end slightly protrudes from the upper surface of the support bracket (34), while its lower end is The lower end of the inner side of the horizontal frame (4), that is, is fitted so as to be slightly inwardly spaced from the lower insertion hole (35), and the upper protruding end is welded to the upper surface of the support fitting (34). It is fixed to.

  The bottom surface of the mounting base (33a), which is connected to the lower end of the armrest (33) and has a longitudinal dimension slightly larger than the outer diameter of the horizontal frame (4), faces the top of the horizontal frame (4). It has an upward arc shape that can be accommodated by fitting the metal fitting (34), and the back end surface forms a flat surface that comes into contact with the upper surface of the support metal fitting (34). A recess (38) having an upward relief groove (37) into which the recess is recessed and having a lateral width substantially equal to the lateral dimension of the support fitting (34) is formed.

  Further, a female screw hole (39) having a lower end opened in the center of the mounting base (33a) is formed in the vertical direction.

To attach the armrest (33), the recess (38) of the mounting base (33a) is fitted to the support fitting (34) and supported by the upper surface, and then the insertion hole ( The hexagon socket head cap screw (40) inserted from 35) is inserted into the spacer (36), screwed into the female screw hole (39) of the mounting base (33a), and tightened. At this time, the head of the bolt (40) is located in the horizontal frame (4) and is not exposed to the outside.
Thereby, even if a horizontal frame (4) consists of one steel pipe, an armrest (33) can be stably attached to this.

  Covers (41) are fitted into openings at both ends of the horizontal frame (4).

  If a long spacer (36) as described above is used, it will act as a guide and the bolt (40) will be tightened easily. Bolts that penetrate the frame (4) are directly screwed into the female screw holes (39), or bolts are inserted into the female screw holes (39) from the upper inner surface of the horizontal frame (4) via a washer that is curved in an arc shape. Sometimes they are screwed together.

  As described above, in the chair of the above embodiment, the separate seat (15) and backrest (18) are attached to the pair of left and right common brackets (12). The number of points and assembly man-hours are reduced.

  Moreover, since the front surface of the lower end of the backrest (18) is attached to the rear end of the bracket (12) below the rear end of the seat (15), the bracket (12) and the lateral frame (4) It is possible to provide a chair that is inconspicuous because it is positioned in front of the lower part of the backrest (18), has a good appearance, and is excellent in design.

  Furthermore, since the female screw hole (20) facing the front-rear direction is provided on the front surface of the lower end of the back frame (19), the female screw hole (20) from the front of the backrest mounting piece (12c) of the bracket (12). The back frame (19) of the backrest (18) separately from the seat body (15) can be easily fixed to the bracket (12) by screwing the bolt (21) to the bracket (12). 21) cannot be seen from the side, so it looks better.

  The back plate (28) is fitted with concave grooves (29) formed on opposite surfaces of the left and right back frames (19) at both side ends, and curled mounting portions (28a) (28b) at both upper and lower ends. Because it is fitted and attached to a pair of upper and lower ridges (24) that connect the upper and lower opposing surfaces of the back frame (19), it is easy and stable without using fixing means such as screws. Can be installed.

  In addition, the lower mounting portion (28b) of the back plate (28) is curled in a forward arc shape so that the curled mounting portion (28b) is not exposed behind the back plate (28). Moreover, since the seat body (15) is located in an inconspicuous corner between the lower rear end of the seat body (15) and the front lower end of the backrest (18), the appearance is improved.

  The upper part of the box-shaped mounting bracket (5) whose upper surface is opened is slightly fitted to the lower surface of the tubular horizontal frame (4), and all contact parts are welded to form the upper part of the support leg (3). In the state where the mounting bracket (5) is fitted in the box-shaped support portion (6) whose upper surface is opened, the bottom plate (5a) of the mounting bracket (5) and the support substrate (6) 6c) is coupled with the bolt (11) and the nut (10), and the horizontal frame (4) is fixed to the upper part of the support leg (3). It becomes easy to position the mounting part 3).

  The mounting bracket (5) is firmly fixed to the horizontal frame (4) by welding, and the mounting bracket (5) and the support portion (6) of the support leg (3) are also provided with four bolts (11 ) And nut (10) so that the horizontal frame (4) is supported against the support leg (3) even if rotational force from a plurality of seats (15) acts on the horizontal frame (4). There is no fear of rotating.

It is a front view of a triple chair to which the present invention is applied. Similarly, it is a right side view. It is the III-III line enlarged vertical side view of FIG. It is the IV-IV line expansion vertical rear view of FIG. It is a VV line enlarged vertical front view similarly. FIG. 6 is a cross-sectional plan view taken along line VI-VI in FIG. 5. It is a VII-VII line vertical side view similarly. It is the VIII-VIII line enlarged vertical front view of FIG. It is the IX-IX line expansion vertical side view of FIG. FIG. 6 is an enlarged vertical sectional side view taken along line XX in FIG. 5. It is a disassembled perspective view of the armrest attachment part of a chair. Similarly, it is an enlarged side view showing a part of the armrest mounting portion in a longitudinal section.

(1) Leg frame
(2) Chair
(3) Support legs
(4) Horizontal frame
(5) Mounting bracket
(5a) Bottom plate
(6) Support part
(6a) (6b) Standing piece
(6c) Support substrate
(7) Groove
(8) Through hole
(9) Stepped hole
(10) Nut
(11) Bolt
(12) Bracket
(12a) Board
(12b) Seat mounting piece
(12c) Backrest mounting piece
(13) Groove
(14) Seat cushion
(15) Seat
(16) Seat frame
(17) Screw
(18) Backrest
(19) Back frame
(19a) Inward mounting part
(20) Female thread hole
(21) Bolt
(22) Locking hook
(23) Engagement hole
(24) Yokohama
(25) Female thread
(26) Stepped hole
(27) Bolt
(28) Backboard
(28a) Upper mounting part
(28b) Lower mounting part
(29) Concave groove
(30) Back cushion
(31) Headrest
(32) Elbow pad
(33) Armrest
(33a) Mounting base
(34) Support bracket
(34a) Downward piece
(35) Insertion hole
(36) Spacer
(37) Escape groove
(38) Recess
(39) Female thread hole
(40) Bolt
(41) Cover

Claims (5)

In a chair armrest mounting structure in which a metal horizontal frame to which a seat body can be mounted is mounted horizontally on the left and right support legs, and an armrest is mounted on the horizontal frame, the horizontal frame is one. , the upper surface of the transverse frame, the supporting bracket in a side view downward U-shaped cross section, the lower end of the front and rear downward piece is brought into contact with the outer peripheral surface of the lateral frame, fixed by welding, to the support bracket The rear end surface provided on the lower end surface of the armrest forms a flat surface, and the upper end surface with the left and right widths substantially equal to the left and right dimensions of the support metal fitting as the flat surface is the upper surface of the support metal fitting. An armrest mounting structure for a chair, which is fitted so as to be in contact with each other, and the horizontal frame and a lower end portion of the armrest are coupled to each other by a fixing means.   The armrest mounting structure for a chair according to claim 1, wherein the horizontal frame has a cylindrical shape, and a support metal fitting is straddled on the upper part and fixed by welding. The armrest mounting structure for a chair according to claim 1 or 2 , wherein the recess of the armrest has a vertical dimension in which the support metal fitting is accommodated and a front-rear dimension to be fitted to a substantially upper half of the horizontal frame. The fixing means is inserted from below into a female screw hole facing the vertical direction provided at the lower end of the recess in the armrest and an insertion hole provided in the horizontal frame and the support bracket, and the upper end is screwed into the female screw hole. The armrest mounting structure for a chair according to any one of claims 1 to 3 , wherein the armrest mounting structure is composed of a bolt. Fit a metal pipe-like spacer into which the screw part of the bolt can be inserted into the insertion hole between the horizontal frame and the support fitting so that the lower end is positioned at the lower end inside the horizontal frame, and the upper end is The chair armrest mounting structure according to claim 4 , wherein the armrest is fixed to the support metal fitting by welding.

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