JP5008993B2 - Chair - Google Patents

Description

  The present invention relates to a chair in which a seat is attached to a seat support frame provided on an upper portion of a leg.

As this type of chair, for example, as described in Patent Document 1, a seat support frame (seat support rod) is provided in a concave receiving portion that opens downward on the left and right lower surfaces of a seat (seat shell). By engaging a locking piece slidably fitted in the front-rear direction and projecting on the side surface of the seat support frame with the upper surface of the locked piece projecting on the opening side edge of the concave receiving portion When the seat is moved forward or backward beyond the moving area during normal use, the engagement between the locking piece and the locked piece is prevented. In some cases, the seat is removed and the seat body can be removed from the seat support frame.
JP 2006-102146 A

  In the chair described in the above-mentioned patent document, when the seat body is attached to the seat support frame, the seat body is moved to a position where the latched piece provided on the seat body does not engage with the latch piece of the seat support frame. Since it has to be moved in the front-rear direction and the mounting position of the seat is limited, the mounting work is troublesome.

  Further, since it is necessary to provide a restricting means for preventing the engagement piece and the engagement piece from being disengaged in the movement region during normal use, the structure of the seat body and the seat support frame is somewhat To be complicated.

  The present invention has been made in view of the above problems, and provides a chair that can be easily attached to a seat support frame without limiting the attachment position or complicating the structure. The purpose is to do.

According to the present invention, the above problem is solved as follows.
(1) In a chair that supports a seat by a seat support frame that includes a pair of left and right side frames facing in the front-rear direction provided on the upper part of the leg, on the lower surface of one side of the seat, A first engagement groove that opens in both the outer side and the front-rear direction is provided, and an elastic engagement piece that can be elastically deformed inwardly on the lower surface of the other side portion of the seat body is inclined downward and outward. A second engagement groove is provided between the upper end of the elastic engagement piece and the lower surface of the seat so as to open in both the outer side and the front-rear direction. The seat is attached to the upper portion of the seat support frame by engaging the pieces with the first engagement groove and the second engagement groove, respectively.

(2) In the above item (1), a recessed portion that opens downward is provided on the lower surface of both side portions of the seat body and the left and right side frames are fitted, and the first engaging groove is formed on the inner side wall of the one recessed portion. At the same time, an elastic engagement piece projects from the lower end of the inner side wall of the other recess, and a second engagement groove is provided between the upper end of the elastic engagement piece and the lower surface in the recess.

(3) In the above item (2), the elastic engagement piece is connected to the lower end of the hanging piece projecting from the lower end of the side wall so as to extend obliquely outward and upward so as to form a substantially V shape when viewed from the front.

(4) In the above item (2) or (3), an outward locking piece projects from the lower end of the inner side wall of the one recess, and the gap between the outward locking piece and the lower surface in the recess is One engaging groove.

(5) In any one of the above items (2) to (4), the dimension between the outer surfaces of the inner side walls in the left and right recesses and the dimension between the opposing surfaces of the engagement pieces in the left and right side frames are Make almost equal.

(6) In any one of the above items (1) to (5), the side frame has an upward U-shaped cross section when viewed from the front, and is inwardly engaged with the upper end of the upper upward piece. The piece is bent so that its upper surface comes into contact with the lower surface of the seat.

(7) In any one of the above items (1) to (6), the front and rear ends of the left and right side frames are connected to each other with a horizontal frame that faces in the left-right direction, whereby the seat support frame is a rectangular frame in plan view. The shape.

According to the first aspect of the present invention, the engagement piece of the one side frame of the seat support frame is engaged from the outside in the first engagement groove provided on the lower surface of the one side portion of the seat body. After that, by elastically deforming the elastic engagement piece provided on the lower surface of the other side portion of the seat body inward by the other engagement piece, this engagement piece is engaged with the second engagement groove, The seat body can be easily attached to the seat support frame from any position in the front-rear direction.
Further, the seat body only needs to be provided with the first engagement groove, the elastic engagement piece, and the second engagement groove on the seat body side, and the inward engagement piece on the side frame side. The structure of the seat support frame is not complicated.

According to the second aspect of the present invention, since the both side frames are fitted in the recesses on the lower surface of the seat body, the height of the seat body can be lowered, and the side frames are located below the seat body. Because it is not exposed greatly, it looks better.
Further, since the engaging pieces of the both side frames are engaged with the first engaging groove and the second engaging groove in the recess, the possibility that the seat body moves in the left-right direction with respect to the seat support frame is small. Become.

  According to the third aspect of the present invention, since the elastic engagement piece is easily elastically deformed inward, the engagement piece of the side frame can be easily engaged with the second engagement groove.

  According to invention of Claim 4, a 1st engagement groove | channel can be easily formed only by protrudingly providing an outward locking piece in the lower end of the inner side wall in a recessed part.

  According to the fifth aspect of the present invention, the seat body is reliably prevented from moving in the left-right direction with respect to the seat support frame.

According to the sixth aspect of the present invention, the bending rigidity of the side frame is increased, the support strength of the seat body is increased, and when the side frame is press-molded with the metal material, the engagement piece is simultaneously formed. It can be formed integrally.
Further, the load of the seat is received by the upper surface of the engagement piece, and the left and right engagement pieces are engaged with the first engagement groove and the second engagement groove in the load receiving portion. The seat body can bend stably with the vicinity of both engaging portions as a center, and there is no risk of disengagement between both engaging pieces and the first and second engaging grooves.

  According to the seventh aspect of the invention, the bending rigidity of the seat support frame and the support strength of the seat body are thereby increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a chair to which the present invention is applied. The chair 1 includes a leg body 2, a seat body 3 provided on an upper portion thereof, a backrest 4, and a pair of left and right armrests 5. ing.

  The leg body 2 includes five leg rods 7 having a radial shape with a caster 6 attached to the tip thereof, and a leg column 8 that can be extended and contracted by a gas spring (not shown) that is erected in the center and accommodated in the center. And a support base 9 having a rear end portion fixed to the upper end thereof.

  The backrest 4 includes a backrest support frame 10 and a backrest 11 attached to the upper portion of the front surface. The front end of the support arm 10a facing the front of a pair of left and right lower ends of the backrest support frame 10 It is pivotally attached to the left and right sides of the rear end of the support base 9 by a pivot 12 that faces in the left-right direction.

The pivot 12 is linked to a forward urging means provided in the support base 9, and the back support frame 10 is urged in a constantly standing direction by the forward urging means, and the urging means. It can be tilted backwards against this.
The armrest 5 is attached to the upper surfaces of the front end portions of the left and right support arms 10a.

As shown in the exploded perspective view of FIG. 2 and the bottom view of FIG. 3, the seat body 3 is attached to a synthetic resin seat plate 14 supported by a metal seat support frame 13 and an upper surface of the seat plate 14. And cushioning material 15.
In addition, the seat body 3 and the seat support frame 13 are the front left side of FIG. 2 and the upper side of FIG.
The seat support frame 13 has a plurality of front and rear (three in the present embodiment) horizontal frames 16 made of pipes that face in the left-right direction and have both ends bent slightly upward, and both end portions of each horizontal frame 16. In addition, the front and rear ends are fixed to each other by welding, and a pair of left and right side frames 17 and 17 having a substantially upward U shape in front view. The overall shape of the seat support frame 13 is formed in a frame shape in plan view. Has been.

Of the three horizontal frames 16, the two lateral frames 16 on the rear side are disposed close to each other.
Both end portions of each horizontal frame 16 are fixed in a state where substantially upper half portions thereof are fitted into notch grooves 18 formed in the lower end portions of the left and right side frames 17, and the lower end portions of the respective horizontal frames 16 are The side frame 17 protrudes slightly below the lower end.

  At the upper ends of the inner upward pieces 17a in the left and right side frames 17, engagement pieces 19 and 19 that are substantially horizontal are connected inward so as to face each other, and are located on the left side of the seated person. The engagement piece 19 (on the right side in FIGS. 2 and 3) is slightly in front of the engagement piece 19 and is opened inward to adjust the front-rear position of the seat body 3 by being engaged with and disengaged from an operation lever device 26 described later. A plurality of engaging grooves 20 are formed at regular intervals in the front-rear direction.

  As shown in FIG. 1, at the front end portion of the support base 9, the lower end portions of a pair of left and right seat support arms 21 facing in the vertical direction are pivotally attached by pivots 22 facing in the left and right directions. The left and right sides of the horizontal frame 16 at the front portion of the seat support frame 13 are pivotably fitted into and supported by a recess (not shown) formed at the upper end of the seat support arm 21 and opening upward. Yes.

The rear portion of the seat support frame 13 is rotatably attached to the upper surfaces of the left and right support arms 10a of the backrest support frame 10 with pivots (not shown) on the two lateral frames 16 at the rear portion. Therefore, it is supported by the back support frame 10.
By adopting such a support configuration, the seat support frame 13 and the seat body 3 attached thereto can be moved forward and backward and rearward and downward in conjunction with the tilting of the backrest 4.

  As shown in FIGS. 3 and 4, a pair of left and right upward recesses 23 that are opened downward to fit the left and right side frames 17 of the seat support frame 13 are formed on the lower surfaces of the left and right side portions of the seat plate 14. , 23 are formed. The front and rear dimensions and the left and right dimensions of the recesses 23 are larger than the front and rear dimensions and the left and right dimensions of the side frame 17, and the dimension L between the outer surfaces of the inner side walls 23a and 23a in the left and right recesses 23 is set to the left and right side frames. 17 is approximately equal to or slightly larger than the dimension between the opposing surfaces of the engagement piece 19.

A plurality of forward and backward outward locking pieces 24 project from the lower end of the inner side wall 23a of the concave portion 23 on the right side when viewed from the front. Between the opposing surfaces of the respective outward locking pieces 24 and the lower surface in the concave portion 23, A first engagement groove 25 that is open in both the outer side and the front-rear direction is formed.
In addition, an elastic engagement piece 27 that is obliquely outwardly upward and can be elastically deformed inward is formed in a V-shape when viewed from the front. A second engagement groove 28 is formed between the upper surface of each elastic engagement piece 27 and the opposite surface of the lower surface in the recess 23. The second engagement groove 28 opens in both the outer and front and rear directions. Has been.

  In order to attach the seat plate 14 to the seat support frame 13, first, the right side frame 17 of the seat support frame 13 is fitted into the concave portion 23 on the right side of the front view of the seat plate 14, and they are relatively moved in the left-right direction. By doing so, the engagement piece 19 of the side frame 17 is engaged with the plurality of first engagement grooves 25 (see the two-dot chain line in FIG. 4).

  Then, the left side portion of the seat support frame 13 is pushed up as indicated by the arrow in FIG. 4 or the left side portion of the seat body 3 is pushed down to fit the left side frame 17 into the left recess 23. To do. At the time of this fitting, the inner end of the engagement piece 19 of the side frame 17 abuts on the outer surface of each elastic engagement piece 27 and elastically deforms it inwardly. The part enters the second engagement groove 25. At the same time, the elastic engagement piece 27 is elastically restored outward and its upper end is positioned immediately below the engagement piece 19, thereby preventing the engagement piece 19 from being separated from the second engagement groove 28. The

  As a result, the seat body 3 is attached to the upper portion of the seat support frame 13 while preventing the seat body 3 from moving in the left-right direction. Therefore, the seat support frame 13 can be moved in the front-rear direction.

  Further, the lower surfaces of both side portions of the seat plate 14 come into contact with the upper surfaces of the inwardly engaging pieces 19 in the left and right side frames 17, and the normal load applied to the seat body 3 is caused by the two engaging pieces 19 or a strong load. Is applied to the entire upper surface of the side frame 17, and the left and right engagement pieces 19, 19 are inserted into the first and second engagement grooves 25, 28 at the load receiving portion. Since the seat body 3 is engaged, the seat body 3 can be stably bent with the vicinity of the engaging portion as a fulcrum, and the engagement between the engagement piece 19 and the first and second engagement grooves 25 and 28 may be disengaged. There is no.

An operation lever device 29 for adjusting the front-rear position of the seat body 3 is attached to the lower surface of the right side frame 17 in the seat support frame 13.
As shown in detail in FIGS. 5 to 9, the operation lever device 29 includes a bracket 30 that can be attached to the side frame 17 and an operation lever 31. The bracket 30 includes a base piece 30a that is fixed to the lower surface of the side frame 17, a standing piece 30b that stands up from its inner end and can abut against the inner side surface of the side frame 17, and front and rear of the standing piece 30b. And a pair of inwardly extending pieces 30c, 30c connected to both ends.

  The operation lever 31 is erected on a substantially horizontal and flat-shaped operation part 31a that faces obliquely forward and outward, a sliding part 31b that stands in the front-rear direction rising from its inner end, and an upper center part of the sliding part 31b. And a raised portion 31c. A plurality of left and right ribs 32 facing in the vertical direction are provided on the inner side surface of the sliding portion 31b to increase the bending rigidity of the operating portion 31a and the sliding portion 31b.

The upright portion 31c has an outwardly U-shaped outer surface so that the front and rear two engaging protrusions that can be engaged with and disengaged from the engaging groove 20 of the seat support frame 13 described above. 33 and 33 are projected.
In addition, a rectangular hole 35 that faces in the vertical direction and opens in both the vertical direction is formed in the inwardly protruding portion 34 that protrudes inwardly in parallel with both the engagement protruding pieces 33 at the upper end portion of the standing portion 31c. The rectangular hole 35 is fitted with an outward upward piece 36a of a leaf spring 36 having a substantially V shape in a front view from below.

  The operating lever 31 is movable back and forth with respect to the bracket 30 and inserted around the support shaft 37 by inserting the sliding portion 31b into the support shaft 37 facing the front and rear direction attached to both inwardly facing pieces 30c of the bracket 30. It is rotatably supported by.

  The operation lever device 29 assembled in advance in this manner has a positioning hole 38 formed on the lower surface of the front end portion of the side frame 17 with a positioning pin 38 protruding upward at the front end corner of the base piece 30a of the bracket 30. Bolts 41 fitted from the lower side and inserted into the two front and rear mounting holes 40, 40 from below are screwed into the two female screw holes 42, 42 on the lower surface of the side frame 17. As a result, the operation portion 31a of the operation lever 31 is attached to the front end portion of the side frame 17 on the right side in the front view of the seat support frame 13 so as to face obliquely forward in the lower part separated from the side frame 17. (See FIGS. 8 and 9).

A locking projection 43 having a U-shape facing outward from the bottom is projected downward at the center of the lower surface of the seat plate 14 adjacent to the right-side recess 23. An inward standing piece 36b of the leaf spring 36 is fitted into the concave portion 44 opened downward and outward from the lower side in a state of being slightly bent outward.
In addition, the inward protrusion 34 of the upright portion 31c of the operation lever 31 is always fitted in the recess 44 so as to be able to be inserted and removed so as to be restricted from moving in the front-rear direction.

  After the operation lever device 29 is mounted, the upright portion 31 c at the upper end of the operation lever 31 is urged outward by the leaf spring 36, so that the front and rear engagement protrusions 33 are engaged with the side frame 17. The mating groove 20 is always engaged with any two adjacent ones. Further, since the inward projection 34 of the operation lever 31 is always fitted in the recess 44 of the locking projection 43 of the seat plate 14, the seat plate 14 is locked with respect to the seat support frame 13, and the seat body 3 is It is prevented from moving in the front-rear direction (see FIGS. 5 and 9).

  As shown in FIG. 6, when the operation portion 31 a of the operation lever 31 is turned upward, the both engagement protrusions 33 of the standing portion 31 c are released from the engagement groove 20, thereby releasing the lock and supporting the seat. The seat 3 can move in the front-rear direction with respect to the frame 13. At this time, the inward projection 34 of the operation lever 31 only enters deeply into the recess 44 of the locking projection 43 of the seat plate 14 and does not separate from the recess 44. Therefore, when the seat body 3 is moved back and forth, The entire operation lever 31 also moves back and forth along the support shaft 37.

  Therefore, if the seat body 3 is moved in the front-rear direction, and the hand is released from the operation portion 31a at an arbitrary position, the engagement protrusion 33 is again engaged with one of the other engagement grooves 20, thereby the seat body 3 Is locked and its front-rear position is adjusted.

  As described above, in the chair 1 of the above-described embodiment, one side frame of the seat support frame 13 is formed in the first engagement groove 25 that opens outward on one side of the lower surface of the seat plate 14. After engaging the engagement piece 19 provided on 17 from the outside, the other side of the seat support frame 13 is pushed up or the other side of the seat body 3 is pushed down to be provided on the lower surface of the other side portion of the seat plate 14. The elastic support piece 27 is elastically deformed inward by the locking piece 19 of the other side frame 17 and the engagement piece 19 is simply engaged with the second engagement groove 28. The seat body 3 can be easily attached to 13.

Accordingly, the front and rear mounting positions of the seat body 3 are not limited, and the seat body 3 can be mounted on the seat support frame 13 from any position in the front-rear direction within the recess 23, and the seat body can be seated after mounting. There is no possibility that the body 3 is easily detached from the seat support frame 13.
Further, on the seat plate 14 side, it is only necessary to form the outward locking piece 24, the first engagement groove 25, the elastic engagement piece 27, the second engagement groove 28, etc. integrally with the molding, In addition, on the side of the seat support frame 13, it is only necessary to bend the engaging piece 19 in the side frame 17, so that the structure thereof is not complicated.

  In the above embodiment, the outward locking piece 24 protrudes from the lower end of the inner side wall 23a of the right recess 23 formed on the lower surface of the seat plate 14, and the outward locking piece 24 and the recess 23 Although the first engagement groove 25 is provided between the lower surface and the outer engagement piece 24, the first engagement groove 25 may be provided directly on the outer surface of the side wall 23a in the recess 23. .

  Moreover, in the said embodiment, although the recessed part 23 with which the side part frame 17 is fitted is provided in the lower surface of the seat board 14, such a recessed part 23 may be abbreviate | omitted and implemented. At this time, the first engagement groove 25 may be provided, for example, by protruding a locking piece having an L-shaped cross section on the lower surface of the seat plate 14 and between this and the lower surface of the seat plate 14. The two engagement grooves 28 may be provided between the upper end and the lower surface of the seat plate 14 by projecting an elastic engagement piece whose outer surface is inclined obliquely upward and downward on the lower surface of the seat plate 14.

  Furthermore, in the said embodiment, although the engagement piece 19 of the seat support frame 13 is engaged with the 1st and 2nd engagement grooves 25 and 28 of the seat body 3 from the side, If the support frame 13 has a structure rotated 90 degrees in plan view, the engagement piece 19 can be engaged with the first and second engagement grooves 25 and 28 in the front-rear direction.

It is a side view of the chair of one embodiment of the present invention. Similarly, it is a disassembled perspective view of a seat support frame and a seat. Similarly, it is a bottom view of a seat support frame and a seat. It is the IV-IV line enlarged vertical front view of FIG. Similarly, it is a VV line expansion vertical front view. FIG. 6 is a longitudinal front view of the same portion as FIG. 5 when the operation lever is operated to unlock the seat. It is a perspective view before the operation lever apparatus attachment to a seat support frame. Similarly, it is a perspective view of the state which attached the operation lever apparatus to the seat support frame. Similarly, it is the perspective view which looked at the state which attached the seat to the seat support frame which attached the operation lever device from the lower part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chair 2 Leg 3 Seat 4 Backrest 5 Armrest 6 Castor 7 Leg 8 Leg Pillar 9 Support 10 Back support arm 10a Support arm 11 Back 12 Axis 13 Seat support frame 14 Seat plate 15 Cushion material 16 Horizontal frame 17 Side frame 17a Upward piece 18 Notch groove 19 Engagement piece 20 Engagement groove 21 Seat support arm 22 Pivot 23 Recess 23a Side wall 24 Outward locking piece 25 First engagement groove 26 Drooping piece 27 Elastic engagement piece 28 2nd engagement groove 29 Operation lever device 30 Bracket 30a Base piece 30b Standing piece 30c Inward piece 31 Operation lever 31a Operation part 31b Sliding part 31c Standing part 32 Rib 33 Engagement piece 34 Inward protrusion 35 Square hole 36 Leaf spring 36a Upward piece 36b Upward piece 37 Support shaft 38 Positioning pin 39 Positioning hole 40 Mounting hole 41 Bolt 42 Female screw hole 43 Stop projection 44 Recess

Claims (7)

In a chair that supports a seat by a seat support frame that is provided on the upper part of the leg and includes a pair of left and right side frames facing in the front-rear direction,
The lower surface of one side of the seat body is provided with a first engagement groove that opens in both the outer side and the front-rear direction, and the lower surface of the other side portion of the seat body has an outer surface inclined obliquely outward and upward. An elastically deformable elastic engagement piece projects downward, and a second engagement groove is provided between the upper end of the elastic engagement piece and the lower surface of the seat body and opens in both the outer and front and rear directions. A seat body is attached to the upper part of the seat support frame by engaging inwardly engaging pieces projecting from the part frame with the first engaging groove and the second engaging groove, respectively. And a chair.   The lower surface of both sides of the seat body is provided with a recessed portion that opens downward to which the left and right side frames are fitted, the first engagement groove is provided on the inner side wall in one of the concave portions, and the inner side wall in the other concave portion The chair according to claim 1, wherein an elastic engagement piece projects from the lower end of the first engagement groove, and a second engagement groove is provided between the upper end of the elastic engagement piece and the lower surface in the recess.   The chair according to claim 2, wherein the elastic engagement piece is connected to the lower end of the hanging piece projecting from the lower end of the side wall so as to extend obliquely outward and upward so as to form a substantially V shape in front view.   The chair according to claim 2 or 3, wherein an outward locking piece protrudes from a lower end of an inner side wall of one of the recesses, and a space between the outward locking piece and a lower surface in the recess serves as a first engagement groove. .   The chair according to any one of claims 2 to 4, wherein a dimension between the outer surfaces of the inner side walls in the left and right recesses and a dimension between the opposing surfaces of the engagement pieces in the left and right side frames are substantially equal to each other. .   The side frame shall have a U-shaped cross section when viewed from the front, and an inward engagement piece shall be bent at the upper end of the inner upward piece so that its upper surface is in contact with the lower surface of the seat. The chair according to any one of claims 1 to 5, which is formed. The chair according to any one of claims 1 to 6, wherein the front and rear ends of the left and right side frames are connected to each other with a horizontal frame that faces in the left-right direction, so that the seat support frame has a rectangular frame shape in plan view.

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