JP6039978B2 - Chair - Google Patents

Description

  The present invention relates to a chair.

  In general, as a chair installed in a public facility such as a theater or an auditorium, when the chair is not used, the seat on which the user sits is in a substantially vertical state along the backrest, and the seat is in a substantially horizontal state when used. The seat portion is known to be rotatable around its rear portion so that

  The pivotable chair as described above includes a seat (seat portion) on which a user can sit, a fixed shaft that rotatably supports the seat, and a seat that fixes both ends of the fixed shaft. What is provided with the support body is proposed. In this chair, the end of the fixed shaft is fitted into a U-shaped groove that opens upward in the seat support, and a screw hole formed in the U-shaped groove is threaded from the outside of the U-shaped groove toward the fixed shaft. The fixed shaft is fixed to the seat support by screwing and crimping the tip of the screw to the fixed shaft (see Patent Document 1 below).

  However, in the chair described in Patent Document 1, the fixed shaft is fixed to the seat support by being crimped at the tip of the screw. When there is a tilt or a tilt, it is easily affected by this distortion or tilt. In other words, the area where the seat rotates is shifted between adjacent chairs, or the position of the tip of the seat facing upward is not aligned when it is in a substantially vertical state when not in use. There were problems such as inferiority.

  Therefore, a seat support shaft (fixed shaft) that is inserted into an insertion groove formed in the side leg (seat support body) that opens rearward and is disposed in the support groove formed in the seat support body, and an insertion There has been proposed a chair provided with a retaining member that is inserted from the groove and disposed on the upper side of the seat support shaft, and a fixing bolt that fastens and fixes the retaining member and the side legs (see Patent Document 2 below). .

  In the chair described in Patent Document 2, the retaining member is fixed to the side leg via the fixing bolt, and the seat supporting shaft is fixed to the side leg by pressing the seat supporting shaft. Has been. Therefore, it is possible to adjust the fixing position of the seat support shaft to the side leg by adjusting the fastening strength between the retaining member and the fixing bolt. Therefore, even if the floor on which the chair is installed has a skew or the like, by adjusting the fixed position, the area where the seats rotate can be aligned between adjacent chairs, It was possible to align the position of the tip of the seat that was directed upward when it was in a substantially vertical state during use.

  Furthermore, while the chair described in Patent Document 1 is point fixing in which a fixed shaft is crimped at the tip of the screw, the chair described in Patent Document 2 has a seat support shaft that is a retaining member. Therefore, the seat support shaft can be securely fixed, and there is an advantage that the seat support shaft does not drop from the side legs.

JP-A-5-176820 JP 2010-46253 A

  Here, in the chair described in Patent Document 2, the operation of fixing the seat support shaft to the side leg is performed by first passing the insertion groove from the rear with the seat portion (cushion body) attached to the seat support shaft. The seat support shaft and the retaining member are disposed in the support groove, and the retaining member is held by one hand. Then, with the other hand, the fixing bolt is inserted from the front into the bolt insertion hole formed in the side leg and screwed into the retaining member. Therefore, there is a problem that the above-described operation of screwing the bolt from the front with the other hand while extending one hand backward to hold the retaining member is extremely inefficient and cumbersome.

  Therefore, in the fixing structure of the fixed shaft of the chair described in Patent Document 1 described above, there is a problem that when deformation such as distortion or inclination occurs on the floor surface, it is easily affected by the deformation. Furthermore, the structure for fixing the seat support shaft of the chair described in Patent Document 2 has a problem that the working efficiency is extremely poor and troublesome.

  The present invention has been made in view of the above circumstances, and has a structure that can securely fix a support shaft that rotatably supports a seat portion and can easily fix the support shaft. A chair is provided.

In order to achieve the above object, the present invention employs the following means.
That is, the chair according to the present invention includes a pair of side legs that are spaced apart in the left-right direction, a support shaft that is disposed between the pair of side legs, and a seat that is supported by the support shaft. A chair that is rotatable about the support shaft between a use position in which the seat portion is in a substantially horizontal state facing the front-rear direction and a non-use position in which the seat portion faces in the up-down direction. And supporting both ends of the support shaft, a support member formed with an opening that opens from the front to the rear, and being inserted from the opening, pressing the support shaft toward the support member, A regulating member that regulates movement of the support shaft; and a fastening member that fastens the regulating member and the supporting member; and a direction in which the regulating member is inserted into the opening and a fastening direction of the fastening member. and wherein the same direction, a and a direction toward the rear from the front That.

In the chair configured as described above, when the regulating member is fastened by the fastening member, the regulating member presses the support shaft. The direction in which the restricting member is inserted into the opening and the direction in which the fastening member is fastened are in one direction. Therefore, it is possible to reliably fix the support shaft that rotatably supports the seat portion, and it is possible to easily fix the support shaft.
Moreover, since the operation | work which inserts a control member in the opening part of a supporting member and the operation | work which fastens a fastening member can be performed from the front, workability | operativity can be improved further.

  In the chair according to the present invention, the support member includes a support wall that supports the support shaft, and a contact wall that is disposed to face the support wall and that contacts the restriction member. The contact wall may have a first wall that comes into contact with the contact wall, and the contact wall and the first wall may be in surface contact with each other.

  In the chair configured as described above, the contact area between the contact wall and the first wall increases due to surface contact between the contact wall and the first wall, so that the regulating member can firmly press the support shaft toward the support wall. .

  In the chair according to the present invention, the contact wall is formed so as to gradually approach the support wall as it goes in the insertion direction, and faces the support wall of the first wall and the restriction member. The second wall to be made may be formed so as to gradually approach as it goes in the insertion direction.

  In the chair configured as described above, a strong pressing force is generated from the restricting member to the support shaft due to the wedge effect, so that the movement of the support shaft can be reliably controlled.

Also, the chair according to the present invention, the a portion of the support member supporting the support shaft of the support member, the portion supported by the support member of the support shaft is non-spherical shape forming a cross section Hogata each other It may be.

In the chair configured as described above, the support shaft can be prevented from rotating on the support member , and thus the movement of the support shaft can be reliably controlled.

  In the chair according to the present invention, the fastening member is inserted into a through hole formed in the restricting member, and is formed on the support member provided on the side leg and a bolt screwed into the support member. And may have a female screw threadedly engaged with the bolt.

  In the chair configured as described above, the regulating member can be fixed to the side leg via the support member by fastening the bolt with the nut formed on the support member provided on the side leg. Therefore, the support shaft is reliably fixed to the side leg by being pressed from the regulating member.

  Further, in the chair according to the present invention, the restricting member is formed with the through hole, the block is loaded with the bolt, and the block can be advanced in the fastening direction together with the bolt, and the bolt is loaded. An engagement portion that engages with the bolt in a state where the bolt is engaged, and a movement restriction portion that restricts retraction of the bolt in the reverse direction in a state where the bolt is retracted a predetermined distance in a direction opposite to the fastening direction. You may have.

In the chair configured as described above, the bolt can be screwed onto the support member and attached in a state in which the bolt is engaged and loaded in the block body in advance, so that work efficiency can be improved. .
Further, when removing the restricting member from the support member, even if the bolt is rotated in the direction to remove the bolt and retracted, the movement restricting portion restricts the movement in the retracting direction of the bolt, so that only the bolt does not come out of the restricting member. The bolt and the regulating member can be integrally removed from the support member.

  According to the chair according to the present invention, when the regulating member is fastened by the fastening member, the regulating member presses the support shaft. The direction in which the restricting member is inserted into the opening and the direction in which the fastening member is fastened are in one direction. Therefore, it is possible to reliably fix the support shaft that rotatably supports the seat portion, and to easily fix the support shaft.

It is sectional drawing in case the (a) seat part of the chair which concerns on 1st embodiment of this invention is in use condition, (b) It is a longitudinal cross-sectional view in case a seat part is in a non-use state. It is a disassembled perspective view of the seat part which comprises the chair which concerns on 1st embodiment of this invention. It is the disassembled perspective view which decomposed | disassembled one part in case the chair which concerns on 1st embodiment of this invention is a non-use state. (A) A state in which the support shaft constituting the chair according to the first embodiment of the present invention is disposed on the upper part of the support member, (b) a state in which the fastening member is loaded on the restriction member, and (c) the support member. It is a side view which shows the state fixed to the side leg, respectively. FIG. 5 is an enlarged view of FIG. It is the perspective view which looked at the control member which comprises the chair which concerns on 1st embodiment of this invention from (a) one direction, (b) It is the perspective view seen from the other direction. It is a side view of the regulation member which constitutes the chair concerning a first embodiment of the present invention. It is sectional drawing of the control member which comprises the chair which concerns on 1st embodiment of this invention. It is an enlarged view of FIG. (A) A state in which the support shaft constituting the chair according to the first embodiment of the present invention is disposed on the upper part of the support member, (b) a state in which the fastening member is loaded on the restriction member, and (c) the support member. It is a perspective view which shows the state fixed to the side leg, respectively. It is sectional drawing of the control member and fastening member which comprise the chair which concerns on 2nd embodiment of this invention. It is sectional drawing of the control member and fastening member which comprise the chair which concerns on 3rd embodiment of this invention. It is a perspective view of the control member which comprises the chair which concerns on 4th embodiment of this invention.

(First embodiment)
Hereinafter, the chair concerning a first embodiment of the present invention is explained.
As shown in FIG. 1, the chair 1 includes a pair of side legs 12 </ b> R and 12 </ b> L that are installed on the floor surface F and spaced apart in the left-right direction, a seat portion 14 that allows a user to sit, The support shaft 24 that supports the portion 14, the backrest portion 20 that supports the back of the user seated on the seat portion 14, and the armrest portions 22 </ b> R and 22 </ b> L that support the elbow of the seated user.

  Further, the chair 1 is in a horizontal state in which the fixing mechanism 2 for fixing the support shaft 24 to the side legs 12R and 12L and the seat portion 14 are in a substantially horizontal state facing the front-rear direction and a user can be seated (FIG. 1). (See (a)) to a non-use state in which the seat portion 14 is oriented in the up-and-down direction (see FIG. 1B), a turning mechanism that allows the seat portion 14 to turn around the support shaft 24. 10.

  Here, for the sake of convenience, the left and front sides of the paper shown in FIGS. 1A and 1B are referred to as the left side and the front side, the right side of the paper side is referred to as the rear side, and the direction orthogonal to the paper plane is referred to as the left-right direction.

(Side leg)
The pair of side legs 12R and 12L are arranged on the floor surface F, and the armrest portions 22R and 22L are arranged on the left and right sides of the pair of left and right side panels 23R and 23L provided on the upper surface, respectively. They are connected to each other by a frame (not shown) extending in the direction.
Further, the side legs 12R, 12L are provided with a support bracket 25 having an L shape in a side view at the rear of the inner surface in the left-right direction, and a backrest portion 20 described later is fixed to the support bracket 25.

(Seat)
The seat 14 includes a seat frame 32 that is rotatably supported by a support shaft 24 by a later-described pivot mechanism 10, a seat cushion 33 that covers the upper and front portions of the seat frame 32, and a seat. A back plate 38 for closing the lower surface of the frame 32.

  As shown in FIG. 2, the seat frame 32 is a substantially rectangular frame-shaped frame that opens in the vertical direction, and has substantially rectangular shaft holes 32R and 32L through which the support shafts 24 are inserted into the rear portions of the left and right side plates. It has been drilled.

  The opening 32X formed in the upper part of the seat frame 32 is provided with a meandering cushion spring 37, and a seat cushion 33 (see FIG. 1; the same applies hereinafter) is placed on the cushion spring 37. Yes. A portion surrounded by the seat frame 32, the seat cushion 33 and the back plate 38 is an internal space S, and a rotation mechanism 10 described later is disposed in the internal space S.

(Support shaft)
The support shaft 24 is a rod-like member having a rectangular shape in cross section extending in the left-right direction. The support shaft 24 is disposed in an internal space S formed inside the seat frame 32, and both end portions 24R and 24L thereof are provided. Projecting from shaft holes 32R, 32L drilled in the seat frame 32.

  As shown in FIG. 3, both end portions 24R and 24L of the support shaft 24 are fixed to a support member 100 provided on side legs 12R and 12L, which will be described later in detail, so that the support shaft 24 cannot rotate. In the state, it is integrally connected to the side legs 12R and 12L.

(Backrest)
Returning to FIG. 1, the backrest portion 20 includes a back plate 28 fixed to a rear portion of a support bracket 25 provided on the side legs 12 </ b> R and 12 </ b> L with a mounting screw 26, and a back cushion 30 stretched on the front surface of the back plate 28. And have.

  The configuration of the backrest 20 may be other than the configuration composed of the back plate 28 and the back cushion 30, for example, a configuration in which the periphery of the pipe frame or the like is covered with a tension material, or a configuration that can be reclined. Good.

(Fixing mechanism)
As shown in FIG. 4, the fixing mechanism 2 includes a support member 100 that supports both end portions 24 </ b> R and 24 </ b> L of the support shaft 24, and a regulating member 110 that regulates the movement of the support shaft 24 disposed inside the support member 100. The fastening member 140 includes a bolt 141 and a female screw 142 that fasten the regulating member 110 and the support member 100.

(Support member)
As shown in FIG. 5, the support member 100 is fixed to the inner surfaces of the side legs 12R and 12L in the left-right direction by fixing means such as screws (not shown), the support wall 101 that supports the support shaft 24, and the support The rear wall 102 is bent upward from the rear portion of the wall 101. Further, the support member 100 is bent forward from the upper part of the rear wall 102 to face the support wall 101 and contact the restriction member 110, and upward from the front portion of the support wall 101. A bent front wall 104.

The contact wall 103 is formed downward so as to gradually approach the support wall 101 from the front to the rear.
The rear wall 102 is formed with a female screw 142 threadedly engaged with the bolt 141 penetrating in the front-rear direction.

  Between the front part of the contact wall 103 and the upper part of the front wall 104, an opening part 105 that opens in the direction from the front to the rear is formed. A space surrounded by the front wall 104, the support wall 101, the rear wall 102, and the abutting wall 103 is an arrangement space P. The support shaft 24 is inserted through the opening 105 from the front toward the rear (insertion direction) and is disposed in the arrangement space P.

  The support wall 101 and the front wall 104 support the front surface 24A and the lower surface 24B of the support shaft 24, respectively. The shape formed by the support wall 101 and the front wall 104 and the shape formed by the front surface 24A and the lower surface 24B of the support shaft 24 are aspherical when viewed in cross section. In the present embodiment, it is formed in a substantially right-angle shape in sectional view.

(Regulatory member)
As shown in FIGS. 6 and 7, the restricting member 110 includes an engaging portion 118 </ b> A that engages a block body 111 in which a through hole 119 is formed in the front-rear direction and a bolt 141 inserted through the through hole 119. And a movement restricting portion 130 that restricts the movement of the bolt 141.

  As shown in FIG. 5, the restriction member 110 is inserted from the front to the rear (insertion direction) through the opening 105 formed in the support member 100, and the upper surface 24 </ b> C of the support shaft 24 in the arrangement space P. It arrange | positions above this support shaft 24 so that it may contact | abut.

  The block body 111 includes a first wall 112 that comes into contact with the contact wall 103 (see FIG. 5; the same applies hereinafter) of the support member 100, and a second wall 113 that faces the upper surface 24C of the support shaft. Yes. Further, the block body 111 connects the first wall 112 and the second wall 113 in the vertical direction, and includes a front connection wall 114 disposed forward, a rear connection wall 115 disposed rearward, and side legs 12R. , 12L, and an outer connecting wall 116 (see FIG. 6; the same applies hereinafter) and an inner connecting wall 117 facing the outer connecting wall 116.

  The first wall 112 and the second wall 113 gradually approach each other as they go from the front to the rear, that is, the first wall 112 gradually goes downward and the second wall 113 goes upward as going from the front to the rear. It is formed as follows.

  As shown in FIG. 6, a recess 120 that is recessed outward in the left-right direction is formed in the front portion of the inner connecting wall 117.

  The front portion of the recess 120 is a first recess 121 that is in communication with the front connection wall 114 and is formed in the front portion of the inner connection wall 117 and has a substantially semicircular shape in cross section. In addition, a pair of through-holes 122 </ b> B communicating with the first recess 121 and spaced apart in the vertical direction and communicating in the horizontal direction are formed. Between this pair of through-holes 122B, it is a part which protrudes toward the inner side of the left-right direction from the rear connection wall 116, and the front-end | tip part is made into the wall part 122. FIG. Further, a second concave portion 122 having a substantially semicircular shape in cross section is formed behind the wall portion 122. As described above, the concave portion 120 is a first concave portion 121, a wall portion 122, and a second concave portion 122 that are recessed from the inner connecting wall 117 toward the outer side in the left-right direction.

  As shown in FIGS. 8 and 9, projections 125 projecting toward the second recess 122 are formed on the upper and lower inner connection walls 117 of the second recess 122.

  Further, as shown in FIG. 6, an arc portion 118 that bulges inward in the left-right direction is formed at the rear portion of the inner connecting wall 117, and a bolt 141 is provided from the front wall 118 </ b> A of the arc portion 118 toward the rear connecting wall 115. A through hole 119 to be inserted is formed. The front wall 118A of the arc portion 118 is configured as an engaging portion with which the head 141A of the bolt 141 is engaged.

  As shown in FIG. 6, the movement restricting portion 130 is configured with a washer having a through hole 131 </ b> A in the present embodiment.

  The upper and lower ends of the movement restricting portion 130 are engaged with the protrusions 125 formed on the inner connecting wall 117 of the block body 111, so that the movement restricting portion 130 is prevented from falling off from the block body 111 in the left-right direction. ing. Further, the movement restricting portion 130 is in contact with the wall portion 122, so that the movement restricting portion 130 is restricted from moving outward in the left-right direction. In this way, the movement restricting portion 130 is loaded in a state in which it cannot move with respect to the block body 111.

  Further, as shown in FIG. 8, the diameter A1 of the through hole 131A of the movement restricting portion 130 is formed smaller than the diameter 141 of the head 141A of the bolt 141. Thereby, even when the bolt 141 moves relative to the block body 111 (retracts) forward, the head 141A of the bolt 141 and the wall portion around the through hole 131A of the movement restricting portion 130 are engaged. Thus, the movement of the bolt 141 is restricted.

  As shown in FIG. 5, the restricting member 110 configured as described above has a bolt 141 having its head 141 </ b> A engaged with an engaging portion 118 </ b> A formed on the block body 111 constituting the restricting member 110. The internal thread 142 formed on the rear wall 102 of the support member 100 is screwed.

  Further, the first wall 112 of the block body 111 and the contact wall 103 of the support member 100 are in surface contact with each other, the second wall 113 of the block body 111 and the upper surface 24C of the support shaft are in surface contact with each other, and further the support member The support wall 101 of 100 and the lower surface 24B of the support shaft 24 are also in surface contact.

  Therefore, the first wall 112 of the block body 111 presses the contact wall 103 of the support member 100 and the second wall 113 presses the upper surface 24 </ b> C of the support shaft 24 by the fastening force between the bolt 141 and the female screw 142. . Due to the pressing force from the second wall 113, the support shaft 24 is fixed to the side legs 12R and 12L via the support member 100 in a state where movement in the front-rear and left-right directions is restricted.

(Rotating mechanism)
As shown in FIG. 2, the rotating mechanism 10 includes a torsion spring 44 inserted on the outer peripheral surface of the spring spacer 42 fitted on the end 24 </ b> R of the support shaft 24, and both ends 24 </ b> R and 24 </ b> L of the support shaft 24. Each has stoppers 48R and 48L fitted outside.

  A bearing 50L, a rotary shaft 52L, a stopper 48L, and a spacer 54 are sequentially inserted from the left shaft hole 32L side into a portion of the support shaft 24 disposed in the internal space S of the seat frame 32, and the right shaft hole 32R is inserted. A bearing 50R, a rotating shaft 52R, a stopper 48R, a spring spacer 42, and a torsion spring 44 are extrapolated sequentially from the side.

  The right end surface of the spacer 54 and the left end surface of the spring spacer 42 are in contact with stop pins 56L and 54R drilled on the outer surface of the support shaft 24, respectively. Is positioned.

  The bearings 50R and 50L have substantially rectangular protruding portions 50A in which the seat frame 32 is fitted from the inner side in the left-right direction in substantially rectangular shaft holes 32R and 32L formed in the seat frame 32. The holes 50B are formed in the 50R and 50L so as to have a substantially circular inner peripheral surface and penetrate in the left-right direction. The bearings 50R and 50L are stepped substantially cylindrical thin plate members, and the bearings 50R and 50L are integrally fixed to the seat frame 32 by fitting the protruding portions 50A into the shaft holes 32R and 32L. ing.

  The rotary shafts 52R and 52L have circular outer peripheral portions 52A that are slidably inserted into the hole portions 50B of the bearings 50R and 50L. The inner peripheral surfaces of the rotary shafts 52R and 52L are substantially rectangular. Thus, a hole 52B penetrating in the left-right direction is formed. The rotating shafts 52R and 52L are stepped, substantially cylindrical thin plate members, and the holes 52B are externally fitted to the outer peripheral surface of the supporting shaft 24, whereby the rotating shafts 52R and 52L are supported by the supporting shaft. 24 is integrally fixed.

  As described above, the outer peripheral portion 52A of the rotary shafts 52R and 52L integrally fitted and fixed to the support shaft 24 with respect to the hole portions 50B of the bearings 50R and 50L integrally fitted and fixed to the seat frame 32. It is inserted so that it can rotate. Thus, the seat frame 32 is pivotally supported with respect to the support shaft 24 in which both end portions 24R, 24L are fixed to the side legs 12R, 12L.

  The stoppers 48R and 48L are protruded toward the inner side in the left-right direction and the end surface edge is formed with a plurality of stop holes 60 along the circumferential direction, and a protruding piece 48B protruding outward in the radial direction have. The stopper 48L is formed with a substantially rectangular hole 48C penetrating in the left-right direction. By inserting the support shaft 24 into the holes 48C of the stoppers 48R and 48L, the stoppers 48R and 48L are integrally provided on the outer peripheral surface of the support shaft 24.

  Thus, the stoppers 48R and 48L fixed integrally with the support shaft 24 rotate relative to the seat portion 14 as the seat portion 14 rotates. Then, when the seat portion 14 is rotated downward by a predetermined amount, the front end portion of the projecting piece 48B is returned from the upper part of the left and right side plates of the seat portion 14 and bent back toward the inner side in the left-right direction. By contacting 32B, the downward rotation of the seat portion 14 is restricted.

  The buffer portion 48D fixed to the tip of the projecting piece 48B is formed in a dome shape by an elastic member, the seat portion 14 rotates downward by a predetermined amount, and the buffer portion 48D contacts the flange portion 32B. It plays the role of absorbing the shock when touching.

  The spring spacer 42 is a cylindrical member in which a hole 42A having a substantially rectangular shape in cross section passing through in the left-right direction is formed. The right end surface of the spring spacer 42 contacts the end surface of the stopper 48R and the left end surface contacts the stop pin 56R. Arranged in position. By inserting the support shaft 24 into the hole 42 </ b> A, the spring spacer 42 is integrally provided on the outer peripheral surface of the support shaft 24.

  One end side 44A of the torsion spring 44 is inserted into a stop hole 60 formed in the protrusion 48A of the stopper 48R, and is wound around the outer peripheral surface of the support shaft 24. The other end side 44B is seat frame. 32 is inserted and fixed in a hole 34 formed in a side plate at the rear portion of 32. That is, the one end side 44A of the torsion spring 44 is supported integrally with the support shaft 24 and the side legs 12R and 12L via the stopper 48R, and the other end side 44B is integrally fixed to the seat frame 32.

  The torsion spring 44 is a torsion spring that can store an elastic force by fixing the one end side 44A and twisting the other end side 44B in a twisting direction and can release the elastic force by releasing the force. Coil spring).

  Thus, the seat frame 32 integrated with the other end side 44 </ b> B of the torsion spring 44 is urged by the torsion spring 44 so that the seat frame 32 faces in the vertical direction (non-use state).

  When a downward load is applied to the seat portion 14, the support shaft 24 and the side legs 12R are moved when the seat portion 14 is rotated from the non-use state to the substantially horizontal state around the support shaft 24. , 12L and the other end side 44B integrally fixed to the seat frame 32 are twisted in the torsional direction, and an elastic force is accumulated in the torsion spring 44. The

  On the other hand, when the downward load applied to the seat portion 14 is released, the accumulated elastic force is released, so that an upward biasing force is generated in the seat frame 32, and the seat portion 14 is not used. Rotate until

Next, a fixing method for fixing the support shaft 24 to the side legs 12R and 12L in the chair 1 configured as described above will be described.
Here, in a production factory or the like, the bolt 141 is inserted into the through hole 119 formed in the front connection wall 114 of the block body 111 of the regulating member 110.

  Further, the movement restricting portion 130 is inserted into the concave portion 120 of the block body 111 from the inner side in the left-right direction. At this time, the protrusion 125 formed on the block body 111 is elastically deformed, so that the movement restricting portion 130 is fitted into the recess 120. Further, when the movement restricting portion 130 and the projection 125 are engaged with each other in the fitted state, the movement restricting portion 130 is prevented from falling off from the block body 111 in the left-right direction. Further, the movement restricting portion 130 is in contact with the wall portion 122, so that the movement restricting portion 130 is restricted from moving outward in the left-right direction.

  As described above, a method for fixing the support shaft 24 to the side legs 12R and 12L at the construction site using the regulating member 110 in which the bolt 141 and the movement regulating unit 130 are loaded in advance in a production factory or the like will be described in detail below. To do.

  First, as a preparation, the bearings 50R and 50L, the rotating shafts 52R and 52L, the stoppers 48R and 48L, the spacers 54, the spring spacers 42, the torsion springs 44, and the seats 14 constituting the rotation mechanism 10 are attached to the support shaft 24. I'm. The both end portions 24R and 24L of the support shaft 24 are projected from the shaft holes 32R and 32L formed in the seat frame 32.

  10A, both end portions 24R and 24L of the support shaft 24 are passed from the front to the rear with respect to the opening 105 of the support member 100 so as to be on the support wall 101 of the support member 100. Arrange.

  In this state, as shown in FIG. 10B, the outer connecting wall 116 of the block body 111 is directed to the inner surfaces in the left-right direction of the side legs 12R and 12L, and the second wall 113 of the block body 111 is directed downward.

  Then, as shown in FIGS. 10B and 10C, the block body 111 is disposed on the support shaft 24 through the opening 105 of the support member 100 from the front to the rear. Then, a tool is inserted into the through hole 131 </ b> A of the movement restricting portion 130 and the head 141 </ b> A of the bolt 141 is turned, and the bolt 141 is screwed with the female screw 142 formed on the rear wall 102 of the support member 100.

  As the fastening force between the bolt 141 and the female screw 142 increases, the bolt 141 moves rearward in the arrangement space P of the support member 100 together with the block body 111.

  Then, as shown in FIG. 5, the first wall 112 of the block body 111 is bonded and pressed to the abutting wall 103 of the support member 100, and the second wall 113 of the block body 111 is bonded and pressed to the upper surface 24 </ b> C of the support shaft 24. The block body 111 is moved backward to the position.

  In this way, the bolt 141 is fastened to the female screw 142 so as to move the block body 111 to a place where the block body 111 presses the support member 100 with an appropriate pressing force.

Next, a method for removing the support shaft 24 from the side legs 12R and 12L will be described.
A tool is inserted from the through hole 131A formed in the movement restricting portion 130, and the head 141A of the bolt 141 is turned in a direction to release the screwing with the female screw 142 with the tool. Thereby, screwing is loosened and the bolt 141 moves forward.

  When the head 141A of the bolt 141 contacts the movement restricting portion 130, the head 141A of the bolt 141 slides along the rear surface of the movement restricting portion 130, and the bolt 141 and the block body 111 are integrally supported. It moves forward so as to be separated from the rear wall 102 of the member 100, and the screwing of the bolt 141 and the female screw 142 is released.

  Thereby, the regulating member 110 and the bolt 141 can be detached from the support member 100, and the support shaft 24 can be detached from the support member 100.

  In the chair 1 configured as described above, the bolt 141 inserted through the through hole 119 formed in the block body 111 is screwed into the female screw 142 formed on the rear wall 102 of the support member 100. Then, due to the fastening force between the bolt 141 and the female screw 142, a pressing force that causes the regulating member 110 to press the support shaft 24 toward the support wall 101 is generated. Therefore, the support shaft 24 can be reliably fixed to the side legs 12R and 12L via the support member 100.

  Here, the support shaft 24 and the regulating member 110 are inserted through the opening 105 of the supporting member 100 from the front to the rear, and the bolt 141 preloaded in the regulating member 110 is screwed into the female screw 142. Both operations can be performed from the front. Therefore, since both operations can be performed from the same direction and can be performed from the front with good workability, the workability can be greatly improved.

  Further, the first wall 112 of the block body 111 constituting the restricting member 110 is formed so as to gradually go downward as it goes from the front to the rear, and the second wall 113 gradually goes upward as it goes from the front to the rear. It is formed as follows. Further, the contact wall 103 of the support member 100 is formed so as to gradually go downward as it goes from the front to the rear. Therefore, the fastening force between the bolt 141 and the female screw 142 acts as a strong pressing force generated from the regulating member 110 to the support shaft 24 due to the wedge effect between the first wall 112 and the contact wall 103. Therefore, the position at which the support shaft 24 is fixed to the side legs 12R and 12L is not shifted, and the support shaft 24 is not likely to drop off from the side legs 12R and 12L. Can do.

  Furthermore, since the contact area between the first wall 112 and the contact wall 103 increases due to surface contact with each other, the restricting member 110 firmly presses the support shaft 24 so that the support shaft 24 is pressed. It can be securely fixed to the side legs 12R and 12L. Therefore, for example, even when the seat portion 14 is rotated to cause a bending moment on the support shaft 24, the support shaft 24 can be reliably prevented from rotating with respect to the side legs 12R and 12L.

  In addition, the shape formed from the support wall 101 and the front wall 104 and the shape formed from the front surface 24A and the lower surface 24B of the support shaft 24 are formed in a substantially right-angle shape in cross section, so the support wall 101 The upper support shaft 24 is prevented from rotating. Therefore, the support shaft 24 can be reliably fixed to the side legs 12R and 12L in a state where the support shaft 24 is prevented from rotating.

  Further, by adjusting the fastening force between the bolt 141 and the female screw 142, the mounting position of the support shaft 24 in the vertical direction and the front-rear direction can be adjusted. Thereby, even when there is deformation such as distortion or inclination on the floor surface F, it is possible to align the tip positions of the seat portions 14 between the adjacent chairs 1 in a state where the seat portions 14 face in the vertical direction when not in use. Therefore, the appearance can be improved.

  Furthermore, since both end portions 24R, 24L of the support shaft 24 are fixed to the support member 100 via the restricting member 110, the mounting positions in the vertical direction and the front-rear direction can be adjusted on both the left and right sides of the seat portion 14. Therefore, since it is only necessary to adjust the fastening force between the bolt 141 and the female screw 142 on either the left or right side of the seat portion 14 or on both sides according to the mounting state, it is highly convenient and the mounting position can be adjusted reliably. it can.

  Further, since the regulating member 110 preloaded with the bolt 141 and the movement regulating unit 130 is used in a production factory or the like, the bolt 141 is screwed into a female screw 142 formed on the rear wall 102 of the support member 100 at the construction site. All you need is it. Therefore, it is not necessary to perform the work of inserting the bolt 141 into the through-hole 119 and the fine work of fitting the movement restricting portion 130 in the recess 120 at the construction site, so that the work efficiency can be improved.

  Further, when the support shaft 24 is removed from the side legs 12R and 12L when the support shaft 24 is inspected, the retraction direction of the bolt 141 is moved by the movement restricting portion 130 even if the bolt 141 is rotated in the direction to remove it. The movement is restricted. Therefore, it is possible to remove the bolt 141 and the regulating member 110 from the support member 100 as a single unit without removing only the bolt 141 from the regulating member 110.

(Second embodiment)
Hereinafter, the chair 201 which concerns on 2nd embodiment of this invention is demonstrated using FIG.
In this embodiment, the same members as those used in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the chair 1 in the first embodiment, the movement restricting portion 130 of the restricting member 110 is configured as a separate member from the block body 111, but in the chair 201 in this embodiment, the movement restricting portion 230 is integrated with the block body 211. It is provided as.

  That is, the block body 211 that is configured with the restricting member 210 is provided with a first protruding piece 214 </ b> A that protrudes forward at the lower portion of the front connecting wall 214. The front connecting wall 214 is provided with a second protruding piece 214B that protrudes forward from the first protruding piece 214A.

The second protruding piece 214B is made of an elastically deformable material, for example, a resin or the like.
The front end of the second projecting piece 214B is provided with a protrusion 230 that gradually extends upward as it goes rearward, and the protrusion 230 is configured as a movement restricting portion.

  Further, a through hole 219 penetrating in the front-rear direction is formed in a portion above the second projecting piece 214B in the front connecting wall 214, and a peripheral portion 220 of the through hole 219 in the front connecting wall 214 is an engaging portion. It is configured as.

  In the restricting member 210, as shown by a two-dot chain line in FIG. 11, when the bolt 141 is inserted into the through hole 219 of the block body 211, the head 141A of the bolt 141 is projected from the second protruding piece 214B. The second projecting piece 214 </ b> B is pressed downward by coming into contact with the portion 230.

  As a result, the second protruding piece 214B is elastically deformed so as to curve downward, and the bolt 141 can move rearward from the protrusion 230 and is inserted into the through hole 219. Moreover, the 2nd protrusion piece 214B moves upwards and returns to the original state.

  Even in the chair 201 configured as described above, when the support shaft 24 is removed from the side legs 12R and 12L, the movement restricting unit 230 causes the bolt 141 to retract in the retracting direction even if the support shaft 24 is retracted by rotating in the direction of removing the bolt 141. Since the movement is restricted, the bolt 141 and the regulating member 210 can be detached from the support member 100 as a single unit without the bolt 141 alone being removed from the regulating member 210.

(Third embodiment)
Hereinafter, the chair 301 which concerns on 3rd embodiment of this invention is demonstrated using FIG.
In this embodiment, the same members as those used in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the chair 301 in the present embodiment, the diameter of the through hole 319 is formed larger than that in the second embodiment, and the bolt 141 can be inserted into the through hole 319 from an oblique direction and after being inserted. The bolt 141 is restricted from moving forward by the movement restricting portion 330.

That is, the block body 311 that constitutes the restricting member 310 is provided with a first projecting wall 314 </ b> A that projects forward from the lower portion of the front connecting wall 314.
A protruding portion 330 protruding upward is provided at the front end of the first protruding wall 314A, and the protruding portion 330 is configured as a movement restricting portion.

  In the restriction member 310, as shown by the solid line in FIG. 12, when the bolt 141 is inserted into the through hole 319 of the block body 311, the bolt 141 is inserted into the through hole 319 obliquely from the upper side. The bolt 141 is inserted into the through hole 319 as indicated by a two-dot chain line.

  Even in the chair 301 configured as described above, when the support shaft 24 is removed from the side legs 12R and 12L, the movement restricting unit 330 causes the bolt 141 to retract in the retracting direction even when the support shaft 24 is retracted by rotating in the direction of removing the bolt 141. Since the movement is restricted, the bolt 141 and the regulating member 310 can be detached from the support member 100 as a single unit without the bolt 141 alone being removed from the regulating member 310.

(Fourth embodiment)
Hereinafter, the chair 401 which concerns on 4th embodiment of this invention is demonstrated using FIG.
In this embodiment, the same members as those used in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the chair 401 according to the present embodiment, a portion through which the bolt 141 is inserted is formed as a concave portion 420 that is recessed from the outer connecting wall 416 arranged along the side legs 12R and 12L in the block body 411.

  That is, the outer connection wall 416 of the block body 411 is formed with a recess 420 that is recessed toward the inside. The front wall 430 that forms the recess 420 is configured as a movement restricting portion. The front wall 430 is provided with a tool hole 414 </ b> A that communicates with and penetrates toward the front connecting wall 414 and communicates with the recess 420.

  In addition, a through hole 419 communicating with the recess 420 is formed in the rear connection wall 415. In addition, a rear wall 421A that forms the recess 420 is configured as an engagement portion.

  In the restricting member 410, as shown by a two-dot chain line in FIG. 13, the bolt 141 is disposed in the recess 420 from an oblique direction, the tip of the bolt 141 is inserted into the through hole 419, and the engaging portion 421A. The head 141A of the bolt 141 is engaged with the bolt 141.

  In this state, the regulating member 410 is provided above the support shaft 24, the tool is inserted from the front into the tool hole 414 </ b> A, and the head 141 </ b> A of the bolt 141 is turned, whereby the bolt 141 is attached to the rear wall of the support member 100. 102 and can be screwed into a female screw 142 formed on 102.

  Even in the chair 1 configured as described above, when the support shaft 24 is removed from the side legs 12R and 12L, the movement restricting portion 430 causes the bolt 141 to retract in the retracting direction even if the bolt 141 is rotated in the removing direction. Since the movement is restricted, the bolt 141 and the regulating member 410 can be detached from the support member 100 as a single unit without the bolt 141 alone being removed from the regulating member 410.

  Further, in a state where the regulating member 410 is provided on the side legs 12R and 12L, the concave portion 420 is arranged facing the inner surface in the left-right direction of the side legs 12R and 12L, and therefore the bolt 141 may drop from the concave portion 420. There is no.

  Further, the operation procedure shown in the above-described embodiment, or the shapes and combinations of the constituent members are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  Alternatively, the support member 100 may be provided reversely in the front-rear direction, and the support shaft 24 and the restriction member 110 may be inserted through the opening 105 from the rear toward the front. Even in such a configuration, the operation of inserting the support shaft 24 and the regulating member 110 and the operation of screwing the bolt 141 preloaded in the regulating member 110 into the female screw 142 can be performed from the rear in the same direction. Therefore, workability can be greatly improved.

  In the second embodiment and the third embodiment, the second projecting piece 214B and the first projecting wall 314A are provided at the lower part of the front connecting walls 214 and 314. You may provide so that it may protrude ahead from one edge part.

  In the fourth embodiment, the portion through which the bolt 141 is inserted is configured as the through hole 419. However, the portion may be configured as a recess that communicates with the recess 420 that is recessed from the outer connecting wall 416 toward the inside. Even in this case, since the outer connecting wall 416 is provided in contact with the inner surfaces of the side legs 12R and 12L in the left-right direction, there is no possibility that the bolt will drop out of the recess.

  In the present embodiment, the support member 100 and the side legs 12R and 12L are separate members, and the support member 100 is fixed to the side legs 12R and 12L. 12R and 12L may be integrally formed.

  In the present embodiment, both end portions 24R and 24L of the support shaft 24 are passed from the front to the rear with respect to the opening 105 of the support member 100 so as to be disposed on the support wall 101 of the support member 100. However, it may be disposed directly on the support wall 101 without passing through the opening 105. For example, in a state where the support shaft 24 is inclined so as to go upward as it goes from the end 24R toward the end 24L, the end 24R of the support shaft 24 is placed on the support wall 101 from the inner side in the left-right direction of the side leg 12R. It is good also as arranging. In this case, since it is not necessary to arrange the support shaft 24 while aiming between the openings 105, workability can be improved.

  Moreover, you may perform the operation | work which loads the volt | bolt 141 and the movement control part 130 in the control member 110 in a construction site. Even in this case, after the regulating member 110 is attached to the supporting member 100 by mounting the bolt 141 and the movement regulating unit 130 on the regulating member 110 before the regulating member 110 is disposed on the supporting member 100. Workability can be improved as compared with the case where the bolt 141 and the movement restricting portion 130 are attached.

DESCRIPTION OF SYMBOLS 1 ... Chair 12R, 12L ... Side leg 14 ... Seat 24 ... Support shaft 24R, 24L ... End of support shaft, both ends of support shaft 100 ... Support member 101 ... Support wall 103 ... Contact wall 105 ... Opening 110 ... Regulating member 111 ... Block body 112 ... First wall 113 ... Second wall 118A ... Front wall (engagement portion) of arc portion
119: Through hole 130 ... Movement restricting portion 141 ... Bolt 142 ... Female screw

Claims (6)

A pair of side legs spaced apart in the left-right direction;
A support shaft disposed between the pair of side legs;
A seat portion supported by the support shaft,
A chair that is rotatable about the support shaft between a use position in which the seat portion is in a substantially horizontal state facing in the front-rear direction and a non-use position in which the seat portion is in a vertical direction;
A support member that supports both ends of the support shaft and has an opening that opens from the front toward the rear ; and
A restricting member that is inserted through the opening, presses the support shaft toward the support member, and restricts movement of the support shaft;
A fastening member for fastening the regulating member and the support member;
A chair characterized in that an insertion direction in which the restriction member is inserted into the opening and a fastening direction of the fastening member are the same direction and a direction from the front toward the rear . The chair according to claim 1 ,
The support member has a support wall that supports the support shaft, and an abutment wall that is arranged to face the support wall and abuts on the restriction member,
The restriction member has a first wall that comes into contact with the corresponding contact wall,
The contact wall and the first wall are in surface contact with each other. The chair according to claim 2 ,
The abutment wall is formed so as to gradually approach the support wall as it goes in the insertion direction;
The first wall and the second wall facing the support shaft of the regulating member are formed so as to gradually approach each other in the insertion direction. In the chair as described in any one of Claims 1-3 ,
Wherein a portion of the support member supporting the support shaft of the support member, wherein a portion supported by the support member of the support shaft, a chair, which is a non-spherical shape forming a cross section Hogata each other. In the chair according to any one of claims 1 to 4 ,
The fastening member is
A bolt inserted through a through hole formed in the restriction member and screwed into the support member;
A chair having a female screw formed on the support member provided on the side leg and screwed into the bolt. The chair according to claim 5 ,
The regulating member is
A block body in which the through-hole is formed and the bolt is loaded and can be advanced in the fastening direction together with the bolt;
An engagement portion engaged with the bolt in a state where the bolt is loaded;
A chair comprising: a movement restricting portion for restricting retraction of the bolt in the reverse direction in a state where the bolt is retracted by a predetermined distance in a direction opposite to the fastening direction.

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