JP2010094454A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce manhour and the number of components by enabling a seat to be attached to legs by work from above or oblique front entire without turning the legs upside down during assembly work, and to eliminate the occurrence of a gap between the seat and a leg frame and the exposure of a seat receiving metal fitting or the like. <P>SOLUTION: The chair includes a front seat receiving horizontal beam 1, a rear seat receiving horizontal beam 2 and a plurality of seat receiving vertical beams 3 for supporting the seat 13. In the chair, a pawl member 5 projecting back and forth is provided on the rear end surface 14 of the seat 13 or the rear seat receiving horizontal beam 2 facing the rear end surface 14, and a recessed part 6 for fitting the pawl member 5 is provided on the other. Further, a front attaching part 4 for attaching the seat 13 to the front seat receiving horizontal beam 1 with a screw 17 screwed from the front of the front seat receiving horizontal beam 1 is provided on the back surface side of the front of the seat 13, and by connecting the front attaching part 4 to the front seat receiving horizontal beam 1 with the screw 17 screwed from the front while the recessed part 6 is fitted to the pawl member 5, the seat 13 is fixed to a seat frame part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a chair seat mounting structure including a seat frame portion having at least a front seat receiving lateral beam supporting a front portion of a seat and a rear seat receiving lateral beam supporting a rear portion. More specifically, the present invention relates to a chair for attaching a seat to a seat frame portion of a leg frame formed by bending a metal pipe or bar.

  A conventional chair that supports a seat with a leg frame formed by bending a metal pipe or bar is seated against a leg frame formed by connecting a front leg 101 and a rear leg 102 via a connecting member 103, as shown in FIG. Four seat receiving plates 105 that support 104 at four points are fixed in advance by welding, and screws 106 are screwed into the structure from the back side to fix the frame portion of the seat 104.

JP 6-93854

  However, in this seat mounting structure, in order to attach the seat 104 to the leg frame, after assembling the leg frame, the leg frame is turned upside down once, and the seat 104 is passed through the four seat support plates 105 of the leg frame. An operation process of fastening with screws 106 is required. After that, it is necessary to turn the chair over again to return it to its original state, and then perform back attachment and other necessary work or carry-out. For this reason, there is a problem that the man-hours are excessive and the work time is increased as the chair is turned upside down and then turned over again. Also, the work of turning the chair over is also a heavy burden for the operator.

  Further, since four seat receiving plates 105 for attaching the seat 104 to the front leg 101 after being bent are welded and fixed with four screws, an extra welding process is required. A seat receiving plate 105 and four screws are required, and there is a problem of cost increase due to an increase in the number of parts. Therefore, it is desired to simplify the work and reduce the number of parts.

  Furthermore, since the seat is fixed to the leg frame only by screwing from the bottom with the seat on the leg frame, it is necessary to set the clearance appropriately in consideration of manufacturing errors and assembly errors. There is a problem that a gap is generated between the leg frame and the appearance is deteriorated. Further, even when viewed from under the chair, the screw 106 and the seat receiving plate 105 are exposed, which makes the appearance worse.

  An object of the present invention is to provide a chair having a structure in which a seat can be attached to a leg by an operation from above or diagonally forward without turning the leg upside down during an assembly operation. Furthermore, an object of the present invention is to provide a chair having a seat mounting structure that can reduce the work process and the number of parts. Furthermore, an object of the present invention is to provide a chair in which a gap between the seat and the leg frame is not generated and a seat receiving bracket is not exposed.

  In order to achieve such an object, the present invention is connected to the front seat receiving lateral beam supporting the front portion of the seat, the rear seat receiving lateral beam supporting the rear portion, and the front seat receiving lateral beam and the rear seat receiving lateral beam. In a chair comprising a leg frame including a seat frame portion having a plurality of seat receiving vertical beams and a seat supported by the seat frame portion, a rear seat receiving lateral beam facing the rear end surface of the seat and the rear end surface A claw member that protrudes in the front-rear direction on one of the two, a recess that fits the claw member on the other, and a rib wall that forms a groove that fits a seat receiving vertical beam on the back of the seat, A front mounting portion for mounting the seat to the front seat receiving horizontal beam with a screw screwed from the front of the front seat receiving horizontal beam on the back side of the front of the front portion in a state where the recess is fitted in the claw member Mounting part in front of front seat receiving beam And so as to secure the seat to the seat frame section by connecting with screws screwed from.

  According to a second aspect of the present invention, in the chair according to the first aspect, the claw member is provided with an elastic protrusion that protrudes in a direction perpendicular to the fitting direction into the concave portion and elastically deforms, and the elastic protrusion is depressed in the concave portion. A through hole is provided, and when the claw member is completely fitted in the recess, the elastic projection of the claw member is inserted into the through hole of the recess so that the seat and the rear seat receiving lateral beam are connected. Yes.

  According to a third aspect of the present invention, in the chair according to the first or second aspect, the front seat receiving lateral beam is provided with a screw hole that allows a screw to be screwed from the front, and the front mounting portion of the seat is provided in the screw hole. Is fixed by screwing it directly to the front seat receiving side beam.

  According to a fourth aspect of the present invention, in the chair according to any one of the first to third aspects, the front seat receiver is brought into contact with the rear side of the front seat receiving lateral beam on the back side of the front of the seat. A front stopper for supporting the transverse beam, the distance from the front stopper to the rear end surface of the seat is set wider than the distance between the front seat receiving transverse beam and the rear seat receiving transverse beam; A force to push the seat backward is generated by pushing the front stopper on the front of the seat to the rear side of the front seat receiving horizontal beam with the recess between the rear seat receiving lateral beam and the claw member fitted. The rear end of the seat is pushed into the rear seat receiving lateral beam so that the gap is eliminated.

  According to a fifth aspect of the present invention, in the chair according to any one of the first to fourth aspects, a void is formed in the rear edge of the seat or the lower lower edge of the back, and the rear portion is formed by handing the void. The chair can be lifted by directly gripping the seat receiving lateral beam.

  According to the chair of the first aspect, the seat is slid toward the rear seat receiving lateral beam so that the claw member disposed at the rear end and the recess are fitted and the front mounting portion in front of the seat is moved forward. Since the seat can be fixed to the seat frame portion by connecting to the seat receiving lateral beam with a screw screwed from the front, a clearance is generated if there is no need to provide a clearance between the rear end of the seat and the lateral seat receiving lateral beam. Since there is nothing, the appearance does not deteriorate.

  In addition, the seat assembly work can be completed from the top or diagonally from the front without turning the legs upside down, so it is necessary to turn the chair upside down and turn it back again to return it to its original position. Therefore, the work time can be reduced and the burden on the worker can be reduced, so that a great improvement in work efficiency can be expected. Further, since the seat assembly work is all from the top or obliquely forward, the assembly work can be carried out in an easy working posture.

  Further, the means for fixing the seat to the leg is a claw member inserted between the rear end surface of the seat and the rear seat receiving lateral beam, and the recess and the front mounting portion of the seat into the front seat receiving lateral beam. Since it is a screw that is screwed in and is almost hidden, it is less exposed than a conventional seat mounting structure using a seat receiving bracket for mounting the seat on the leg, and the appearance is good. In addition, seat mounting brackets for mounting the seat are eliminated, and the number of parts and screwing man-hours can be reduced since the assembly of the seat to the leg frame is completed simply by screwing the front part of the seat by reducing the number of screws. it can. Manufacturing costs can be reduced by reducing the number of parts and work processes.

  Further, the seat wall can be stably supported by preventing the seat from being displaced in the left-right direction by the rib wall into which the seat receiving vertical beam constituting the seat frame portion is fitted. In addition, since the rib wall also serves as a guide for fitting the engaging claw and the concave portion between the rear end of the seat and the rear seat receiving lateral beam, the assembling operation is further facilitated. In addition, the rib wall provides a blinding effect that covers the side of the vertical beam, so that the appearance can be improved. Furthermore, since the rib effect is obtained by the presence of the rib wall, the strength of the seat can be increased.

  Further, according to the chair of the second aspect, when the elastic projection of the claw member is inserted into the through hole of the recess and the seat and the rear seat receiving lateral beam are completely connected, the elastic projection of the claw member is It can be confirmed that the sound has been firmly fitted with the click-stopping sound ("click" sound) that enters the through-hole and the movement. For this reason, poor connection of the rear part of the seat during assembly can be prevented beforehand.

  Furthermore, according to the chair of claim 3, the seat fixing is completed by connecting the front portion of the seat and the front seat receiving lateral beam to the front seat receiving lateral beam by screwing directly. The number of parts and the number of screwing steps can be reduced, and the manufacturing cost can be reduced. In addition, since the front portion of the seat is directly fixed to the front seat receiving horizontal beam, the seat can be fixed firmly without any back-and-forth movement or vertical movement.

  Furthermore, according to the chair according to claim 4, since the distance from the front stopper of the seat to the rear end surface is set wider than the distance between the front seat receiving lateral beam and the rear seat receiving lateral beam, When the front stopper is pushed into the rear side of the front seat receiver horizontal beam (rear seat receiver horizontal beam side), a force is generated that simultaneously pushes the seat toward the rear seat receiver horizontal beam side, so that the rear end of the seat becomes the rear seat receiver. The seat is pushed into the transverse beam and can be fitted so that the seat is in close contact with the rear seat receiving transverse beam without any gap. Therefore, it is possible to prevent a gap from being formed between the leg frame at the rear end of the seat.

  Furthermore, according to the chair of the fifth aspect, the hand can be directly applied to the rear seat receiving side beam through the space formed in the rear edge of the seat or the lower edge of the back, so that the chair can be easily lifted and carried. It becomes. For this reason, when the chair is stacked, the rear seat receiving horizontal beam can be used as a stacking handle portion by utilizing this empty space, so that stacking work is facilitated.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  FIG. 1 to FIG. 12 show an example of an embodiment in which the present invention is applied to a chair called a circle leg chair. The chair 1 is configured such that a hard resin seat plate (seat) 13 and a back plate (back) 26 are attached to a leg frame in which a steel bar is bent.

  The leg frame is formed by continuously bending the front leg frame portion 19, the rear leg frame portion 20, the bottom connecting frame portion 21 connecting them, and the back plate mounting frame portion 22 supporting the back plate 26 by bending one steel bar. The pair of leg members are connected to each other by a front seat receiving lateral beam 1 and a rear seat receiving lateral beam 2 as leg joint bars, thereby forming a so-called circle frame leg. It is composed. Further, between the front seat receiving lateral beam 1 and the rear seat receiving lateral beam 2, a plurality of frames constituting a seat frame portion between the front seat receiving lateral beam 1 and the rear seat receiving lateral beam 2, for example, Two seat receiving vertical beams 3 are arranged and connected to the front seat receiving horizontal beam 1 and the rear seat receiving horizontal beam 2 by welding. The two seat support vertical beams 3 are arranged at a sufficient lateral interval to stably support the seat plate 13 near both ends of the front seat support horizontal beam 1 and the rear seat support horizontal beam 2. Yes. In this embodiment, as the frame material, a solid round bar of low carbon steel or carbon steel for mechanical structure having a diameter of about 12 mm, which is much smaller than a generally used pipe, is used. Therefore, the rear seat receiving lateral beam 2 in which the seat plate 13 and the back plate 26 are closely contacted without any gap is not seen from the front, and at first glance, the seat plate 13 and the back plate 26 appear to be integrated. Needless to say, the size and material of the round bar constituting the seat frame part and the leg frame including the seat frame part are not particularly limited to the above-mentioned small-diameter round bar, and pipes and rounds of generally used sizes are used. Rods, square or polygonal pipes and rods can also be used.

  The seat plate 13 is formed of a hard synthetic resin such as polypropylene. And the rib for comprising the front part attaching part 4 for attaching the seat board 13 to the front seat receiving horizontal beam 1, the front part stopper 9, and the groove | channel 11 which accommodates the seat receiving vertical beam 3 in the back surface side. The wall 10 and the pedestal 12 are integrally formed. Further, a recessed portion 6 is integrally formed at the rear end of the seat plate 13 so as to fit the claw member 5 that opens to the rear end surface 14 and protrudes from the rear seat receiving lateral beam 2. In addition, an upholstery or a cushion material may be attached to the seat plate 13 as necessary.

  The front mounting portion 4 is for mounting the front portion of the seat plate 13 on the front side of the front seat receiving horizontal beam 1 with a screw 17 screwed from the front of the front seat receiving horizontal beam 1. A through hole 16 is formed in the standing wall facing the receiving transverse beam 1 for allowing the fixing screw 17 to pass therethrough. A rib wall is integrally formed on both sides of the standing wall for reinforcement, and the strength necessary for fixing the seat plate 13 is secured. In the case of the present embodiment, the front mounting portion 4 is disposed in front of the rib wall 10 that constitutes the groove 11 into which the seat receiving vertical beam 3 is fitted, and between the front end edge of the rib wall 10 and the front portion. Engaging so as to hold the seat receiving lateral beam 1 and undercut in the removing direction is configured, and the seat plate 13 is simply placed on the front seat receiving lateral beam 1 and pushed in. Therefore, it is possible to install the front seat receiving lateral beam 1. Specifically, the rib wall 10 facing the front seat receiving transverse beam 1 and the edge of the front mounting portion 4 are curved with a slightly larger radius of curvature than the front seat receiving transverse beam 1 made of steel bar, Even when the seat plate 13 is not fixed by the screw 17, it slightly functions as an undercut with respect to the movement in the direction in which the seat plate 13 is removed from the front seat receiving lateral beam 1. Further, when the front seat receiving lateral beam 1 is pushed between the rib wall 10 and the opening end side of the edge of the front mounting portion 4 (portion where the front seat receiving lateral beam 1 enters and exits). A guide surface is formed so as to generate a force that pushes between the front end edge of the rib wall 10 and the front mounting portion 4 so that the front seat receiving transverse beam 1 passes slightly. Therefore, by simply pressing the seat plate 13 from above, the space between the front end edge of the rib wall 10 and the front mounting portion 4 expands, and the front seat receiving lateral beam 1 is received and clamped.

  On the other hand, the front seat receiving lateral beam 1 is provided with a screw hole 18 through which a screw 17 can be screwed from the front. The screw 17 is screwed into the screw hole 18 through the through hole 16 of the front mounting portion 4. The front part of the plate 13 is fixed directly to the front seat receiving transverse beam 1.

  Further, as shown in FIG. 1, a front stopper 9 that is inserted into the rear side of the front seat receiving horizontal beam 1 and supports the front seat receiving horizontal beam 1 is provided on the back side of the front portion of the seat plate 13. It is arranged at the center of the seat plate 13. As shown in FIG. 12, the front stopper 9 includes a support wall that receives and supports the front seat receiving lateral beam 1 from the rear and a rib wall that reinforces the support wall. In the case of this embodiment, three support walls are installed at intervals in the width direction of the seat plate 13, and these are rib walls on which they hang in a vertical direction from the back surface of the seat plate 13 in equilibrium with the front seat receiving transverse beam 1. Are connected by The edge of the support wall facing the front seat receiving lateral beam 1 is a curved surface having a curvature radius in which the upper half near the seat plate 13 is substantially the same as or slightly larger than the front seat receiving lateral beam 1. The lower half is composed of a straight surface that is substantially vertical. Therefore, when the front end of the front stopper 9 is brought into contact with the rear side of the center of the front seat receiving horizontal beam 1 and the seat plate 13 is pushed into the front seat receiving horizontal beam 1 side, the front seat receiving horizontal beam 1 The front stopper 9 is moved along the circumferential surface of 1 and the seat plate 13 is moved rearward. Here, the distance L1 from the front stopper 9 (more specifically, the front surface in contact with the front seat horizontal beam 1) to the rear end surface 14 of the seat plate 13 is the front seat horizontal beam 1 and the rear seat horizontal. It is set wider than the distance L2 from the beam 2. Specifically, L1 is set to be about 0.5 mm larger than L2. As a result, the front stopper 9 in front of the seat plate 13 is moved to the front seat receiving side in a state where the recess 6 and the claw member 5 between the rear end surface 14 of the seat plate 13 and the rear seat receiving lateral beam 2 are fitted. A force that pushes the seat plate 13 backward simply by pushing the beam 1 backward is generated so that the rear end surface 14 of the seat plate 13 is pushed into the rear seat receiving lateral beam 1. As a result, the rear end surface 14 of the seat plate 13 is provided so as to be in close contact with the rear seat support lateral beam 1 so that there is no gap between them.

  The rib wall 10 covers and conceals both sides of the seat support vertical beam 3 so that the seat support vertical beam 3 cannot be seen from the side of the chair. A pedestal 12 is formed at the bottom of the groove 11 that accommodates the seat support vertical beam 3 to absorb the gap and shape difference between the seat support vertical beam 3 and the seat plate 13. Therefore, the seat receiving vertical beam 3 is provided so as to support the seat plate 13 via the base 12. The front end of the vertical rib 10 constituting the left and right grooves is formed in a curved curved surface, and the front seat receiving horizontal beam with the front mounting portion 4 arranged on the opposite side across the front seat receiving horizontal beam 1 1 is pinched. In addition, you may make it attach the rib wall 10, the front part attaching part 4, and the front part stopper 9 to what was comprised by the seat board 13 and the separate member depending on the case.

  Further, a space 15 is formed at the rear end portion of the seat plate 13, and the chair can be lifted by directly gripping the rear seat receiving lateral beam 2 through the space 15. In this embodiment, the empty space 15 is formed only at one position in the center of the rear end surface 14 of the seat plate 13, but depending on circumstances, two or more positions may be provided so as to be distributed to the left and right. In some cases, the space 15 is provided at the lower edge of the back plate 26 and may not be formed on the seat plate 13 side, or may be provided on both the seat plate 13 and the back plate 26.

  A claw member 5 projecting in the front-rear direction is inserted into one of the rear end surface 14 of the seat plate 13 and the rear seat receiving lateral beam 2 facing the rear end surface 14, and the claw member 5 is inserted into the other. A recess 6 is provided to connect the seat plate 13 and the rear seat support transverse beam 2. In this embodiment, as shown in FIGS. 5, 6, and 10, the claw member 5 is attached to the rear seat receiving lateral beam 2 by welding so as to protrude toward the front seat receiving lateral beam 1, while the concave portion 6 is integrally formed with the resin seat plate 13 so that the claw member 5 is depressed in the front-rear direction on the rear end surface 14 of the seat plate 13. The claw member 5 is provided with an elastic protrusion 8 that protrudes in a direction perpendicular to the insertion direction into the recess 6 and elastically deforms. The recess 6 is provided with a through hole 7 into which the elastic protrusion 8 is recessed. When the claw member 5 is completely inserted, the elastic protrusion 8 of the claw member 5 is provided in the through hole 7 of the recess 6 so that the seat plate 13 and the rear seat receiving lateral beam 2 are connected. Yes. In the present embodiment, the claw member 5 and the recessed portion 6 are installed at two equal positions in each of two positions so as to sandwich the left and right seat support vertical beams 3. May be more or less. For example, when the space 15 is provided at the lower end of the back 26 without being provided at the rear end of the seat plate 13, the claw member 5 and the recess are not only arranged symmetrically on the left and right sides of the seat plate 13 but also at the center of the rear end surface 14. It is preferable to arrange 6 to make a total of 5 or 3 sets.

  Further, in the present embodiment, as shown in FIG. 9, the back plate 26 is fitted into a plurality of, for example, four back plate reinforcing plates 23 and the back plate mounting frame 22 provided on the rear seat support horizontal beam 2. It has been. As shown in FIGS. 5 and 7, the back plate reinforcing plate 23 is erected upward along the back plate mounting frame 22 and welded to the rear seat support horizontal beam 2, and is attached to the lower end surface of the back plate 26. The back plate reinforcing plate recess 28 is fitted. Further, the back plate 26 has an insertion bar insertion hole 27 and is also fixed by an insertion bar 25 that is press-fitted through an insertion bar through hole 24 provided in the rear seat receiving lateral beam 2.

  According to the chair configured as described above, when the seat plate 13 is assembled to the leg frame, the groove portion 11 defined by the rib wall 10 on the back surface of the seat plate 13 on the seat receiving vertical beam 3 of the seat frame portion. The seat plate 13 can be roughly positioned in the lateral direction with respect to the leg frame simply by positioning and mounting so as to fit each other. Therefore, by simply pushing the seat plate 13 so as to slide toward the rear seat receiving lateral beam 2, the latching claw 5 is fitted into the recess 6 on the rear end surface of the seat plate 13, and the rear end surface 14 side of the seat plate 13 is the rear portion. It is connected to the seat receiving transverse beam 2 and can be positioned almost accurately. When the front of the seat plate 13 is further pushed down, the front mounting portion 4 and the front stopper 9 on the back side are fitted to the front seat receiving lateral beam 1 while being deformed, and the positioning of the seat plate 13 in the front-rear direction is completed. To do. At this time, the interval L1 from the front stopper 9 to the rear end surface 14 of the seat plate 13 is set slightly wider than the interval L2 between the front seat receiving lateral beam 1 and the rear seat receiving lateral beam 2. The seat plate 13 generates a force that pushes backward between the front seat receiving lateral beam 1 and pushes it backward. The rear end face 14 of the seat plate 13 is in close contact with the rear seat receiving lateral beam 2 without any gap. In this state, the front portion of the seat plate 13 and the front seat receiving lateral beam 1 are fixed by frictional force. Therefore, by slightly lifting the front of the chair with the seat plate 13 or the leg frame, the screw 17 is screwed into the screw hole 18 of the front seat receiving lateral beam 1 through the hole 16 of the front mounting portion 4 on the seat side. The fixing of the seat plate 13 by direct screwing to the front seat receiving lateral beam 1 can be completed via the front mounting portion 4 of the seat plate 13.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention. For example, the seat plate 13 of the present embodiment is a hard plastic seat plate provided with a cushion material and an upholstery, but is not particularly limited to this, for example, not shown A seat with a mesh sheet that has enough tension and strength to form a seating surface on the annular seat frame, or a cushion material or an overlying fabric covered on the mesh sheet as necessary. It is possible to adopt seats made of various structures and materials. In this case, the plurality of seat receiving vertical beams constituting the seat frame portion support the annular seat frame between the front seat receiving horizontal beam 1 and the rear seat receiving horizontal beam 2 connecting the left and right leg frames. It is preferable that the front seat receiving lateral beam 1 and the rear seat receiving lateral beam 2 are arranged at positions where both ends are connected to each other.

  Further, in the present embodiment, the seat frame portion is disposed vertically (in the front-rear direction of the chair) between the front seat receiving lateral beam 1 and the rear seat receiving lateral beam 2 and both the beams 1 and 2, and both beams 1. , 2 are connected to each other, and if the seat frame portion is constituted by at least the front seat receiving lateral beam 1 and the rear seat receiving lateral beam 2, the main seat The seat mounting structure of the invention can be applied. In particular, the seat support vertical beam 3 that connects the front seat support horizontal beam 1 and the rear seat support horizontal beam 2 is not necessary in some cases, and the front leg frame 19 and the rear leg frame 20 are separated from the seat plate 13. It is also possible to connect the front and rear leg frames by connecting with each other. In this case, the seat is supported by a seat frame portion composed of a front seat receiving lateral beam and a rear seat receiving lateral beam. In addition, when the seat can be supported only by the front seat receiving lateral beam 1 and the rear seat receiving lateral beam 2, it is not necessary to provide a plurality of seat receiving vertical beams that support the middle of the seat plate, and cover them. It is not necessary to provide a vertical rib wall for hiding.

  Further, in the present embodiment, the description has been mainly given by taking an example of a chair configured so that the seat and the back can be seen as one body, but the present invention is not particularly limited thereto, and the front portion that supports the front portion of the seat As long as it includes a seat frame portion having at least a seat receiving transverse beam and a rear seat receiving transverse beam that supports the rear portion, a chair provided in a completely independent form with a back from the seat, The present invention can be applied as an attachment structure for seats of various chairs such as a chair, a swivel chair, and a connecting chair.

  Further, the claw member 5 and the recess 6 that connect the rear seat receiving lateral beam 2 and the rear end of the seat plate 13 are provided with the claw member 5 on either the rear end surface 14 of the seat plate 13 or the rear seat receiving lateral beam 2. It is sufficient if the other is provided with a recess 6, and the claw member 5 may be formed on the rear end surface 14 of the seat and the recess 6 may be formed on the rear seat receiving lateral beam 2 side.

It is a bottom view which shows one Embodiment of the seat which comprises the chair of this invention. It is a center longitudinal cross-sectional view of the seat of FIG. It is a top view which shows one Embodiment of the leg frame which comprises the chair of this invention. It is a front view of the same leg frame. It is a perspective view which shows the relationship between a rear seat receiving horizontal beam, a seat receiving vertical beam, a back plate reinforcement board, and a claw member. It is a longitudinal cross-sectional view which shows the relationship between a rear seat receiving horizontal beam and a claw member. It is a longitudinal cross-sectional view which shows the relationship between a rear seat receiving horizontal beam and a backplate reinforcement board. It is a top view which omits a back board and shows one Embodiment of the chair of this invention. It is a front view which omits a seat board and shows one Embodiment of the chair of this invention. It is a longitudinal cross-sectional view which shows one Embodiment of the connection structure of the seat board of the state which made the nail | claw member and the recessed part fit, and a rear seat receiving horizontal beam. It is a longitudinal cross-sectional view which shows one Embodiment of the connection structure of a front seat receiving horizontal beam and a front attachment part. It is a longitudinal cross-sectional view which shows one Embodiment of a front seat receiving horizontal beam and a front stopper. It is a cross-sectional view showing the relationship between the seat plate and the seat receiving vertical beam. It is a perspective view which shows the attachment structure of the conventional chair seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front seat receiving horizontal beam 2 Rear seat receiving horizontal beam 3 Seat receiving vertical beam 4 Front mounting part 5 Claw member 6 Recess 7 Through hole 8 Elastic protrusion 9 Front stopper 10 Rib wall 11 Groove 12 Base 13 Seat plate (seat )
14 Rear end face 15 of the seat 16 Space 16 Through hole 17 of the front mounting portion Screw 18 Screw hole L1 of the front seat receiving lateral beam L2 from the front claw portion formed on the back surface of the seat to the rear end face L2 Front seat Spacing between the receiving transverse beam and the rear seat receiving transverse beam

Claims (5)

A front seat receiving transverse beam supporting the front portion of the seat, a rear seat receiving transverse beam supporting the rear portion, and a plurality of seat receiving longitudinal beams connected to the front seat receiving transverse beam and the rear seat receiving transverse beam. A chair including a leg frame including a seat frame portion having a seat frame and a seat supported by the seat frame portion, and a front and rear of either the rear end surface of the seat and the rear seat receiving horizontal beam facing the rear end surface A claw member projecting in the direction, a concave portion for fitting the claw member on the other side, and a rib wall constituting a groove for fitting the seat receiving vertical beam on the back surface of the seat, A front mounting portion for attaching the seat to the front seat receiving horizontal beam with a screw screwed from the front of the front seat receiving horizontal beam on the back surface side of the front seat receiving in the state where the recess is fitted into the claw member Front mounting part in front Chair the seat is intended to be fixed to the seat frame section by coupling with the screw screwed from the front to the front receiving seat cross beam. The claw member includes an elastic projection that protrudes in a direction perpendicular to the insertion direction into the recess and elastically deforms, and the through-hole into which the elastic projection is inserted is provided in the recess, and the claw member is disposed in the recess. The chair according to claim 1, wherein, when fully inserted, the elastic protrusion of the claw member is inserted into the through hole of the concave portion, and the seat and the rear seat receiving lateral beam are connected. The front seat support horizontal beam is provided with a screw hole that allows a screw to be screwed from the front, and the front mounting portion of the seat is directly screwed into the screw hole by passing through the front mounting portion of the seat. The chair according to claim 1 or 2, wherein the fixing to the transverse beam is completed. A front stopper is provided on the back side of the front of the seat so as to contact the rear side of the front seat receiving horizontal beam and support the front seat receiving horizontal beam, and from the front stopper to the rear end surface of the seat. An interval is set wider than an interval between the front seat receiving lateral beam and the rear seat receiving lateral beam, and the recess between the rear end of the seat and the rear seat receiving lateral beam and the claw member are provided. In the fitted state, the front stopper at the front of the seat is pushed to the rear side of the front seat receiving horizontal beam to generate a force to push the seat rearward, and the rear end of the seat becomes the rear seat receiving horizontal beam. The chair according to any one of claims 1 to 3, wherein the chair is pushed in to eliminate a gap. 2. A space is formed in a rear edge of the seat or a lower lower edge of the back, and the chair can be lifted by directly gripping the rear seat receiving transverse beam through the hand through the space. The chair according to any one of 4 to 4.

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