JP6483538B2 - Chair - Google Patents

Description

  The present invention relates to a chair having a backrest.

  As a chair for children, there is a chair that can adjust the vertical position (height) of the backrest (backrest body) as the child grows. For example, Patent Document 1 has a backrest laid between opposing surfaces of a pair of legs provided in the width direction of the chair, and the backrest can be adjusted at a plurality of vertical positions of the legs. A chair is disclosed. In the chair disclosed in Patent Document 1, a connecting member for connecting a pair of leg rods is provided on the back side of the backrest.

  Patent Document 2 discloses a chair including a backrest composed of a backrest support member connected to a seat and a backrest body erected on the backrest support member. In this chair, the backrest body is located on the front side of the backrest support member. Moreover, also in the chair described in patent document 2, the connection member which connects a pair of leg rods in the back side of the backrest is provided. Such a connecting member is used as a handle for a seated person to carry and carry.

Japanese Patent No. 4855583 Japanese Utility Model Publication No. 48-13380

  By the way, in the chair described in Patent Document 1, since the backrest and the leg are fixed at points by screws or the like, the strength against the load applied to the backrest is reduced, and the backrest from the leg is reduced. It is difficult to increase the amount of overhang. For this reason, in order to raise the vertical position of the backrest further upward, it is necessary to lengthen the length of the leg in the vertical direction, but this increases the height of the entire chair, and for children with a short height, Carrying is difficult.

  On the other hand, in the chair described in Patent Document 2, since the backrest body is configured to be received by the backrest support member on the surface, the backrest support strength is high, and the upper end portion of the backrest body is supported by the backrest. Even if the amount of overhang from the member is large, a constant supporting strength can be maintained.

  However, in the chair described in Patent Document 2, in consideration of the support strength for the backrest support member and the height of the chair, when increasing the overhang amount of the backrest body with respect to the backrest support member, When the backrest body is supported on the front surface of the backrest support member, the vertical position of the backrest body is adjusted along the shape of the backrest support member. For this reason, the space | interval of a connection member and the upper end part of a backrest becomes small in the highest position of a backrest, and the problem that a connection member cannot be used as a handle or it becomes difficult to use arises.

  The present invention has been made in view of the above-described problems, and the backrest main body installed on the backrest support member has high support strength, and the connecting member that connects the backrest support members is used as a handle. The purpose is to provide an easy chair.

  In order to solve the above-described problems and achieve the object, a chair according to an aspect of the present invention includes a seat and a backrest supported by a leg, and the backrest is spaced apart in the width direction and the legs. A pair of backrest support members extending upward from the body, a backrest body disposed so as to contact a front surface of the pair of backrest support members, and the pair of backrest support members, A vertical position adjustment mechanism that adjusts the vertical position of the backrest main body, and a connecting member that connects the pair of backrest support members in the opposing direction, the backrest main body via the vertical position adjustment mechanism The pair of backrest support members are erected, and the vertical position adjustment mechanism protrudes from the back surface of the backrest body, and both ends in the width direction are opposed to opposing inner surfaces of the pair of backrest support members. Back projections and both ends of the back projection And a sliding recess formed on one of the opposing inner surface, and formed on either one of both end surfaces of the back projection and the opposing inner surface, and can slide relative to the sliding recess. And a fixing means for fixing the sliding recess to the sliding projection, each of the pair of backrest support members from above the sliding recess. And an inclined portion inclined backward with respect to the vertical direction, wherein the connecting member connects the inclined portions of the pair of backrest support members.

  Moreover, the chair which concerns on 1 aspect of this invention WHEREIN: The said back protrusion is provided in the lower part of the said backrest main body, The said sliding recessed part is formed in the said backrest support member, It is characterized by the above-mentioned.

  Further, in the chair according to one aspect of the present invention, the connecting member is formed such that the wide surface is parallel to the inclined direction of the inclined portion and the substantially central portion in the width direction is narrow in the inclined direction. It is characterized by.

  ADVANTAGE OF THE INVENTION According to this invention, the support strength of the backrest main body constructed by the backrest support member is high, and the chair which can use a connecting member which connects backrest support members mutually as a handle can be provided.

FIG. 1 is a perspective view of a chair according to an embodiment of the present invention. FIG. 2 is a side view of the chair according to the embodiment of the present invention. FIG. 3 is an exploded perspective view showing a main part of the chair according to the embodiment of the present invention. FIG. 4 is an exploded perspective view showing a main part of the chair according to the embodiment of the present invention. FIG. 5 is an exploded perspective view of the chair according to the embodiment of the present invention. FIG. 6 is a schematic explanatory diagram of the front-rear position adjustment mechanism provided in the chair according to the embodiment of the present invention. FIG. 7 is an exploded perspective view of the front-rear position adjustment mechanism provided in the chair according to the embodiment of the present invention. FIG. 8 is a perspective view of the backrest main body and the back projection provided in the chair according to the embodiment of the present invention as seen from the back side. FIG. 9 is a schematic explanatory diagram of the chair adjustment method according to the embodiment of the present invention. FIG. 10 is a schematic explanatory diagram of an adjustment method of the front / rear position adjustment mechanism provided in the chair according to the embodiment of the present invention. FIG. 11 is a schematic explanatory diagram of an adjustment method of the front-rear position adjustment mechanism provided in the chair according to the embodiment of the present invention. FIG. 12 is a perspective view showing a state after adjusting the position of the seat and the vertical position of the backrest body in the chair according to the embodiment of the present invention. FIG. 13 is a side view showing a state after adjusting the position of the seat and the vertical position of the backrest body in the chair according to the embodiment of the present invention.

  Below, with reference to an accompanying drawing, a suitable embodiment of a chair concerning the present invention is described in detail. In addition, this invention is not limited by this embodiment. Moreover, the drawings are schematic, and it should be noted that the relationship between the dimensions of each element, the ratio of each element, and the like may differ from the actual ones. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included. Moreover, in each drawing, the same code | symbol is attached | subjected to the same component.

(Composition of chair)
First, the structure of the chair 1 which concerns on embodiment of this invention is demonstrated. FIG. 1 is a perspective view of a chair 1 according to an embodiment of the present invention. FIG. 2 is a side view of the chair 1 according to the embodiment of the present invention. As shown in FIGS. 1 and 2, the chair 1 according to the embodiment of the present invention has a leg 10 and a seat supported by the leg 10 via a seat-side vertical position adjusting mechanism 30 (vertical position adjusting mechanism). 20 and a backrest 50 supported by the leg 10. In the present embodiment, the direction in which the front of the person sitting on the chair 1 in the normal posture faces is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the upper side of the person seated in the chair in the normal posture is called “up”, the opposite direction is called “lower”, and the chair is in the normal posture. The left side of the seated person is called “left”, and the opposite direction is called “right”. Moreover, the left-right direction of the chair 1 may be called the width direction.

  The leg 10 includes a pair of leg members 11 that are separated from each other on the left and right, and a seat 20 is supported on a front connecting member 12 (connecting member) and a rear connecting member 13 that are installed between the pair of leg members 11. . Each of the pair of leg members 11 includes a pair of leg rods 14 that are separated in the front-rear direction, an upper connecting member 15 that connects the upper portions of the pair of leg rods 14, a lower surface of the pair of leg rods 14, and a floor surface. And a floor contact portion 16 in contact therewith.

  Specifically, the pair of leg pads 14 includes a front leg 14a and a rear leg 14b. The front leg 14a extends so as to incline backward with respect to the upward direction, and the rear leg 14b extends so as to incline forward with respect to the upward direction. In the present embodiment, the inclination angle of the rear leg 14b is larger than that of the front leg 14a.

  3 and 4 are exploded perspective views showing a main part of the chair 1 according to the embodiment of the present invention, and FIG. 5 is an exploded perspective view of the chair 1 according to the embodiment of the present invention. The seat-side vertical position adjustment mechanism 30 includes a first fixing portion 31 that fixes the front portion of the seat 20 to a plurality of vertical positions with respect to the pair of leg members 11, and a rear portion of the seat 20 with respect to the pair of leg members 11. And a second fixing portion that is fixed to a plurality of vertical positions. In the present embodiment, the seat side vertical position adjusting mechanism 30 includes a first fixing portion 31 that fixes the front connecting member 12 to a plurality of vertical positions with respect to the pair of leg members 11 and a rear side with respect to the pair of leg members 11. It has the 2nd fixing | fixed part 32 which fixes the connection material 13 to several vertical positions. At least one of the first fixing portion 31 and the second fixing portion 32 is arranged in the front-rear direction of the first fixing portion 31 and the second fixing portion 32 according to the vertical position for fixing the front portion of the seat 20 or the rear portion of the seat 20. It has a front-rear position adjustment mechanism 40 that changes the mutual interval in the direction. In the present embodiment, the first fixing portion 31 has a front / rear position adjustment mechanism 40.

  In the present embodiment, the front leg 14 a and the front connecting member 12 are fixed at the first fixing portion 31, and the rear leg 14 b and the rear connecting member 13 are fixed at the second fixing portion 32. Specifically, the first fixing portion 31 includes the front leg 14a and the front connecting member 12 by screwing the screw 31a into the hole 14aa formed in the front leg 14a and the hole 12a formed in the front connecting member 12. Is fixed (see FIGS. 3 to 5). Similarly, in the second fixing portion 32, the rear leg 14b and the rear connecting member are formed by screwing the screw 32a into the hole 14ba formed in the rear leg 14b and the hole 13a formed in the rear connecting member 13. 13 is fixed.

  A plurality of holes 14aa formed in the front leg 14a are formed along the extending direction of the front leg 14a. A plurality of holes 14ba formed in the rear leg 14b are also formed along the extending direction of the rear leg 14b. Specifically, five holes 14aa are formed in a direction inclined backward with respect to the upward direction, and five holes 14ba are formed in a direction inclined forward with respect to the upward direction. (See FIG. 3). Each of the holes 14aa and 14ba is provided to adjust the vertical position (height position) of the seat 20 to a plurality of vertical positions (five levels in the chair shown in FIG. 1). In the holes 14aa and 14ba formed in this manner, the mutual distance between the holes 14aa and 14ba varies depending on the vertical position, and the mutual distance between the front coupling member 12 and the rear coupling member 13 fixed at this position varies.

  A recess 14ab is formed along the hole 14aa on the surface where the front legs 14a face each other, and the side end 12b of the front connecting member 12 is disposed in the recess 14ab. When the position of the seat 20 is adjusted, the front connecting member 12 slides within the range of the recess 14ab.

  In the present embodiment, the rear connecting member 13 is fixed to the lower surface of the seat 20. On the other hand, the front connecting member 12 is attached to the lower surface of the seat 20. A sliding surface 12c that slides when the seat 20 moves in the front-rear direction in the adjusted state is formed on the upper portion of the front connecting member 12. In the fixed state, the sliding surface 12c serves as the seat 20. Support. Here, the adjustment state means a state in which the vertical position and the front-back position of the seat 20 are adjusted, and the fixed state means a state in which the position of the seat 20 is fixed after the position of the seat 20 is adjusted. ing.

  FIG. 6 is a schematic explanatory view of the front-rear position adjustment mechanism 40 provided in the chair 1 according to the embodiment of the present invention. FIG. 7 is an exploded perspective view of the front-rear position adjustment mechanism 40 provided in the chair 1 according to the embodiment of the present invention. The front-rear position adjustment mechanism 40 allows the front connecting member 12 that supports the lower surface of the seat 20 to prevent relative movement in the front-rear direction in the fixed state while allowing the relative movement in the front-rear direction in the fixed state. Have.

  In the present embodiment, the front connecting member 12 has a fixing member 41 that extends in the lower surface and rearward direction of the seat 20 and can be fixed to the seat 20. The fixing member 41 has an L shape, and one side of the L shape is fixed by a screw 41a (see FIGS. 6 and 7). Further, the other side of the L-shape of the fixing member 41 is formed with a long hole 42 that is elongated in the front-rear direction and opens in the up-down direction. The fixing member 41 is fastened and fixed to the seat 20 by a fastening member 43 inserted into the long hole 42. That is, the fastening member 43 is fastened and fixed to the seat 20 by being inserted into the hole 20a of the seat 20 in the vertical direction with respect to the long hole 42 (see FIG. 10). The fixing member 41 has a plate shape with the wide surface facing the up-down direction.

  The pair of floor contact portions 16 extend in the front-rear direction so as to contact the floor surface. A lever 17 is fixed to the inner facing surfaces of the pair of floor contact portions 16 by screws 17a. For example, luggage can be placed on the lever 17. The floor contact portion 16 has a caster 16a for moving the chair 1. The caster 16 a is pressed to the floor surface by an elastic member (not shown). When the user sits on the chair 1, the elastic member contracts, so that the caster 16 a moves to the seat 20 side, and the bottom surface of the floor contacting portion 16. 16b touches the floor (see FIG. 2). This stabilizes the chair 1 when the user is seated.

  The seat 20 is a plate-like member on which a user sits, and is formed in a substantially rectangular shape in plan view. The seat 20 is supported by the front connecting member 12 and the rear connecting member 13. The seat 20 is fixed to the rear connecting member 13 on the lower surface as described above, and is attached to the front connecting member 12 via the front / rear position adjusting mechanism 40. In the chair 1, as described above, the vertical position of the seat 20 can be adjusted in five stages. Note that FIG. 1 shows a state in which the vertical position of the seat 20 is the lowest side. When the position of the seat 20 is moved upward, the seat 20 moves forward. That is, in the chair 1, for example, when the vertical position of the seat 20 is adjusted in accordance with the growth of the child, the front and back positions of the seat 20 are also adjusted.

  The seat 20 includes a sliding portion 21 provided on the back side of the seat 20 so as to be slidable in the front-rear direction with respect to the fixing member 41 (see FIG. 6). The sliding portion 21 has a pair of sliding members 22 extending in the front-rear direction, and a groove portion 23 is formed on the opposing surface of the pair of sliding members 22 along the front-rear direction. A fixing member 41 is fitted into the groove 23, and the fixing member 41 can slide along the groove 23 in the front-rear direction.

  The backrest 50 includes a pair of backrest support members 51, a backrest main body 52, a back side vertical position adjustment mechanism 60 (vertical position adjustment mechanism), and a connecting member 70. The pair of backrest support members 51 are extended so as to be spaced apart in the width direction and extend upward from the rear end of the leg 10. In the present embodiment, the pair of backrest support members 51 are extended from the leg body 10 so as to be inclined slightly rearward with respect to the vertical direction. Further, the pair of backrest support members 51 are connected to each other in the opposing direction by a connecting member 70.

  Each of the pair of backrest support members 51 has an inclined portion 53 that is inclined backward with respect to the vertical direction from above a sliding recess 62 described later (see FIG. 2). That is, the backrest support member 51 has an inclined portion 53 that is inclined further rearward than the direction extending from the leg 10. By providing the connecting member 70 in the inclined portion 53 as described above, a gap is formed between the backrest main body 52 and the connecting member 70 even if the vertical position of the backrest main body 52 is set upward. It has become.

  The connecting member 70 has a function of connecting the pair of backrest supporting members 51 to increase the strength of the chair 1 and serving as a grip portion when the chair 1 is carried. The connecting member 70 is formed such that the wide surface is parallel to the inclination direction of the inclined portion 53 and the substantially central portion in the width direction is narrow in the inclined direction (see FIG. 3). The connecting member 70 has a hole 71 at the end and a protrusion 72. The inclined portion 53 is formed with a recess 53b into which the hole 53a and the protrusion 72 are fitted. Then, the screw 73 is screwed into the hole 53a of the inclined portion 53 and the hole portion 71 of the connecting member 70, and the protruding portion 72 is fitted into the recessed portion 53b formed in the inclined portion 53, whereby the connecting member 70 is paired. The backrest support member 51 is attached.

  The backrest main body 52 is a plate-like member for the user to put his back on, and has an upper end curved when viewed from the front. The backrest main body 52 is constructed so as to be in contact with the front surfaces of the pair of backrest support members 51 via the back side vertical position adjusting mechanism 60.

  FIG. 8 is a perspective view of the backrest main body 52 and the back projection 61 provided in the chair 1 according to the embodiment of the present invention as seen from the back side. The back side vertical position adjustment mechanism 60 is provided between the pair of back support members 51 and adjusts the vertical position of the back support body 52. The back-side vertical position adjustment mechanism 60 protrudes from the back surface of the backrest main body 52, and has a back surface protrusion 61 whose both ends in the width direction are opposed to the opposing inner surfaces of the pair of backrest support members 51, and the back surface protrusion 61. A sliding recess formed in one of the opposite side end surfaces of the pair of backrest support members 51, a side end surface of the back protrusion 61, and a facing inner side surface of the pair of backrest support members 51. It has a sliding projection formed on the other side and slidably fitted to the sliding recess, and a fixing means 64 for fixing the sliding recess to the sliding projection.

  In this embodiment, the back protrusion 61 is provided in the lower part of the backrest main body 52, and the sliding recessed part 62 is formed in the opposing inner surface of the backrest support members 51 (refer FIG. 2, 3). The sliding recess 62 extends in the extending direction of the back support member 51. Further, the rear projection 61 is formed with sliding projections 63 on both side end surfaces. The fixing means 64 includes, for example, a plurality of screw holes 51a formed in the vertical direction of the pair of backrest support members 51, a screw hole 63a formed in the sliding protrusion 63, and screws into the screw holes 51a and 63a. And a mating screw 64a. In the chair 1, three screw holes 51a are formed in the vertical direction, and the vertical position of the backrest main body 52 can be adjusted in three stages.

(Assembling method of chair)
Next, a method for assembling the chair 1 will be described. In addition, the backrest main body 52 and the back protrusion 61 are demonstrated as what is attached previously. First, the lever 17, the front connecting member 12, the backrest main body 52, and the connecting member 70 are attached to the leg member 11 with screws 17a, 31a, 64a, and 73, respectively (see FIG. 3). Here, the front connecting member 12 selects an appropriate hole 14aa from the plurality of holes 14aa formed in the front leg 14a so that the position of the seat 20 is a desired vertical position.

  Next, the other leg member 11 is similarly attached to the opposite side of each member to which the leg member 11 is attached using screws 17a, 31a, 64a, 73 (see FIG. 4). Next, the seat 20 is disposed so that the lower surface of the seat 20 is positioned on the sliding surface 12c provided on the upper portion of the front connecting member 12 (see FIG. 5). At this time, the seat 20 is attached so that both end portions of the fixing member 41 are fitted in the groove portion 23 of the sliding portion 21 (the pair of sliding members 22) provided on the lower surface of the seat 20. Then, the rear connecting member 13 and the leg member 11 are fixed by the screw 32 a and the fixing member 41 and the seat 20 are fixed by the fastening member 43. In this way, the chair 1 is assembled.

(How to adjust the chair)
Next, a method for adjusting the chair 1 will be described. FIG. 9 is a schematic explanatory diagram of a method for adjusting the chair 1 according to the embodiment of the present invention. 10 and 11 are schematic explanatory views of an adjustment method of the front-rear position adjustment mechanism 40 provided in the chair 1 according to the embodiment of the present invention. 12 and 13 are a perspective view and a side view showing a state after adjusting the position of the seat 20 and the vertical position of the backrest body 52 in the chair 1 according to the embodiment of the present invention.

  First, a method for adjusting the vertical position and the front-back position of the seat 20 will be described. From the state in which the chair 1 is assembled as described above, the screws 31a and 32a and the fastening member 43 are removed (see FIG. 9), and a hole is selected from the plurality of holes 14aa and 14ba so that the seat 20 is in a desired vertical position. The upper and lower positions of the front connecting member 12 and the rear connecting member 13 are matched so as to correspond to 14aa and 14ba. 12 and 13, the fixing positions of the front connecting member 12 and the rear connecting member 13 are aligned with the holes 14aa and 14ba formed at the uppermost position.

  At this time, when the seat 20 is lifted upward, the side end portion 12b of the front connecting member 12 slides in the recess 14ab of the leg body 10, and the movement of the front connecting member 12 enters the groove portion 14ab. Be regulated. Here, the fixing member 41 slides on the groove portion 23 of the sliding portion 21 provided on the back surface of the seat 20, and at the same time, the lower surface of the seat 20 slides on the sliding surface 12c of the front connecting member 12, The relative front-rear positional relationship between the seat 20 and the front connecting member 12 changes, and the front-rear direction position of the seat 20 is adjusted (see FIGS. 10 and 11). After adjusting the position of the seat 20, the screws 31a and 32a and the fastening member 43 are attached again, and each member is fixed.

Next, a method for adjusting the vertical position of the backrest main body 52 will be described. With the screw 64a removed, the backrest main body 52 is lifted upward. In the chair 1 of FIG.12 and FIG.13, the case where the backrest main body 52 has been arrange | positioned uppermost is shown. At this time, since the sliding protrusion 63 is regulated so as to slide in the sliding recess 62, the vertical position of the backrest body 52 can be easily moved to the desired position. After adjusting the position, the screw 64 a is attached again, and the backrest main body 52 is fixed to the backrest support member 51.
As described above, in the chair 1, as shown in FIGS. 12 and 13, the vertical position and front / rear position of the seat 20 and the vertical position of the backrest main body 52 can be adjusted.

  In the chair 1 according to the present embodiment configured as described above, the first fixing portion 31 is a front / rear position adjusting mechanism 40 that changes a mutual interval between the first fixing portion 31 and the second fixing portion 32 in the front / rear direction. The front / rear position adjusting mechanism 40 supports the lower surface of the seat 20 so as to allow relative movement in the front / rear direction of the seat 20 in the adjusted state, while preventing relative movement in the front / rear direction in the fixed state. A front connecting member 12 is provided. In this configuration, the front connecting member 12 that prevents relative movement of the seat 20 in the front-rear direction in the fixed state is configured to support the lower surface of the seat 20, and is disposed at a position where the side surface of the seat 20 is easily visible. It is not provided and the design of the chair 1 becomes good.

  Furthermore, in the present embodiment, the front connecting member 12 has the fixing member 41 disposed on the lower surface of the seat 20, and thus the front connecting member 12 and the seat 20 can be easily fixed by the fixing member 41. Further, the fixing member 41 is formed with a long hole 42 that is elongated in the front-rear direction and opens in the vertical direction, and is fastened and fixed to the seat 20 by a fastening member 43 inserted into the long hole 42. Therefore, since the screw hole of the front-rear position adjusting mechanism is not visible in the side view, the design is good.

  Moreover, in the chair 1, in the 1st fixing | fixed part 31 and the 2nd fixing | fixed part 32, since the front connection material 12, the back connection material 13, and the leg member 11 are directly fixed, support strength is high, and when a user sits down Can fully support the load in the vertical direction.

  Further, a sliding portion 21 is provided on the back surface of the seat 20, and when the position of the seat 20 is adjusted, the front and rear positions can be adjusted while sliding the seat 20 on the sliding portion 21, so that smoother The seat 20 can be relatively moved in the front-rear direction. Further, in this case, since the seat 20 is supported by the sliding portion 21 in the adjusted state, the seat 20 is prevented from falling, the position of the seat 20 can be adjusted more safely, and the workability is excellent. Further, since the front connecting member 12 has the sliding surface 12c that slides with respect to the seat 20 in the adjusted state, the seat 20 can be easily relatively moved in the front-rear direction.

  Further, the pair of backrest support members 51 includes an inclined portion 53 that is inclined rearward with respect to the vertical direction from above the sliding recess 62, and the connecting member 70 is disposed between the inclined portions 53. Yes. In this configuration, since the connecting member 70 is disposed behind the backrest main body 52, the chair 1 can be easily carried using the connecting member 70 as a gripping hand. Even when the position of the backrest main body 52 is arranged upward, a gap is provided between the backrest main body 52 and the connecting member 70, so that the connecting member 70 can be gripped.

  In this embodiment, the sliding recess 62 formed in the back support member 51 extends from the leg 10 side in the extending direction of the back support member 51, and the inclined portion 53 is the extending direction of the sliding recess 62. It extends in a direction inclined further to the rear side. Since the connecting member 70 is fixed to the inclined portion 53, a gap can be reliably provided between the backrest main body 52 and the connecting member 70, and the connecting member 70 can be gripped.

  Further, the back support member 51 is formed with a sliding recess 62 and the back projection 61 is formed with a slide projection 63. Therefore, when the vertical position of the backrest main body 52 is adjusted, the slide is supported. Since the backrest main body 52 can be moved while the protrusion 63 is slid into the sliding recess 62, the position of the backrest main body 52 can be easily adjusted. Further, since the back protrusion 61 is disposed on the lower side of the back surface of the backrest main body 52, the upward movement width of the backrest main body 52 can be increased, and the backrest main body 52 is connected to the backrest main body 52. The gap with the member 70 can also be increased. As a result, the user can move the backrest main body 52 up and down and more easily grip the connecting member 70.

Further, since the connecting member 70 is formed so that the wide surface is parallel to the inclination direction of the inclined portion 53 and the substantially central portion in the width direction is narrow in the inclined direction, the user can When viewed from above, the position to be the grip portion can be easily confirmed, and the connecting member 70 can be easily gripped.
Further, since the backrest main body 52 is supported by the front surface of the backrest support member 51, the support strength is high.

  Note that the present invention is not limited to the above embodiment. What was comprised combining each component mentioned above suitably is also contained in this invention. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspect of the present invention is not limited to the above-described embodiment, and various modifications can be made.

  For example, in the above-described embodiment, the case where the rear connecting member is fixed to the lower surface of the seat and the front connecting member is attached to the lower surface of the seat with the front-rear position adjustment mechanism interposed is described, but the front connecting member is fixed to the lower surface of the seat. The rear connecting member may be attached to the lower surface of the seat with a front / rear position adjusting mechanism interposed therebetween. Moreover, although the said embodiment demonstrated the case where the back connection material of the lower surface of a seat was fixed in a 2nd fixing | fixed part, it is good also as a structure which fixes a seat directly to a 2nd fixing | fixed part, without using a back connection material.

DESCRIPTION OF SYMBOLS 1 Chair 10 Leg 11 Leg member 12 Front connection material (connection material)
12a hole 12b side end portion 12c sliding surface 13 rear connecting member 13a hole 14 pair of leg rods 14a front leg 14aa hole 14ab recess 14b rear leg 14ba hole 15 upper connecting member 16 floor contact portion 16a caster 16b bottom surface 17 insulator 20 seat 21 slide Moving part 22 Sliding member 23 Groove part 30 Seat side vertical position adjusting mechanism (vertical position adjusting mechanism)
31 First fixing portion 31a Screw 32 Second fixing portion 32a Screw 40 Front / rear position adjustment mechanism 41 Fixing member 41a Screw 42 Long hole 43 Fastening member 50 Backrest 51 Backrest support member 51a Screw hole 52 Backrest main body 53 Inclined portion 53a Hole
53b Recess 60 Back side vertical position adjustment mechanism (vertical position adjustment mechanism)
61 Back projection 62 Sliding recess 63 Sliding projection 64 Fixing means 64a Screw 70 Connection member 71 Hole 72 Projection 73 Screw

Claims (3)

It has a seat and backrest supported by the legs,
The backrest is
A pair of backrest support members spaced apart in the width direction and extending upward from the legs,
A backrest body disposed to contact the front surface of the pair of backrest support members;
An up-down position adjustment mechanism that is provided between the pair of backrest support members and adjusts the up-down position of the backrest body;
A coupling member that couples the pair of backrest support members in opposite directions;
The backrest body is installed on the pair of backrest support members via the vertical position adjustment mechanism,
The vertical position adjustment mechanism is
A back projection that protrudes from the back surface of the backrest body, and whose both end portions in the width direction face opposite internal surfaces of the pair of backrest support members;
Sliding recesses formed on either one of the end faces on both sides of the back protrusion and the opposing inner surface;
A sliding protrusion that is formed on either one of the both side end faces of the back protrusion and the opposing inner surface, and is slidably fitted to the sliding recess;
Fixing means for fixing the sliding recess to the sliding protrusion,
Each of the pair of backrest support members includes an inclined portion that is inclined rearward with respect to the vertical direction from above the sliding recess, and the connecting member connects the inclined portions of the pair of backrest support members. A chair that is characterized by The back protrusion is provided at a lower portion of the backrest body,
The chair according to claim 1, wherein the sliding recess is formed in the back support member. 3. The connecting member according to claim 1 or 2, wherein the connecting member is formed so that the wide surface is parallel to the inclined direction of the inclined portion and the substantially central portion in the width direction is narrow in the inclined direction. The chair described in.

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