JP5451005B2 - Upholstered chair - Google Patents

Description

  The present invention relates to a flip-up chair installed in, for example, a theater, a movie theater, a stadium, or the like.

As a conventional chair of a flip-up type, for example, there are those described in Patent Documents 1 and 2.
Japanese Utility Model Publication No.59-77445 JP-A-5-176820

  In each of the seat-up chairs described in Patent Documents 1 and 2, the angular shaft portions protruding from both side surfaces of the seat in the seat support shaft that supports the seat so as to be able to turn upward are used as side legs. Since it is only fixed with a set screw after being fitted into the U-shaped support groove facing upward in the side view, the support strength at both ends of the seat support shaft is low, and if the set screw is loosened even slightly, the seat There is a possibility that the support shaft and the seat rattle in the vertical direction, or the seat support shaft may come off from the side legs.

  The present invention has been made in view of the above problems, and by firmly fixing the left and right outer end portions of the seat support shaft to the inner surfaces of the left and right side legs, the seat support shaft and the seat can be moved vertically. An object of the present invention is to provide a flip-up chair that can prevent rattling and the seat support shaft from coming off the side legs.

According to the present invention, the above-mentioned problems are solved as follows.
(1) The seat disposed between the legs is rotated between a substantially horizontal use position and an upward non-use position by a seat support shaft facing in the left-right direction with the outer ends supported by the left and right side legs. In a seat-up type chair that is movably supported , the inner side surfaces of the left and right side legs have a U-shape in an upward direction that is complementary to the outer shape of the outer end portion of the seat support shaft, and The support groove that opens in the direction and the insertion groove that opens to either the front or back above the upper groove and that has an inclined surface that is inclined so that the lower surface of the upper end expands toward the opening are continuous vertically. The outer end portion of the seat support shaft is fitted into the support groove, the upper surface of the seat support shaft is set to the insertion groove, the upper surface is inclined at the same angle as the inclined surface, and the lower surface the detachment preventing member which is a flat surface, the lower surface of the upper end of the insertion groove inclined surface of the upper surface Kicking inclined surface abuts, and as flat surface of the lower surface is mutually surface contact with the flat surface of the upper surface of the seat support shaft, inserted, by clamping means, the opening of the retaining member insertion groove opposite By tightening so as to move in the direction, the outer end portion of the seat support shaft is pressed by a wedge action and fixed to the support groove.

  With such a configuration, the left and right outer end portions of the seat support shaft are fitted in the support grooves on the inner surfaces of the side legs, and the wedge action is caused by the retaining member inserted into the insertion groove above the support groove. Thus, the seat support shaft and the seat supported thereby are not likely to rattle in the vertical direction or come off the side legs.

Further, when the retaining member is tightened by the tightening means, a downward pressing force effectively acts on the seat support shaft, so that the seat support shaft can be more firmly fixed to the support groove.

Further, since the seat support shaft is reliably prevented from rotating, the seat can be stably supported by the seat support shaft so as to be rotatable.

In addition, since the contact area between the seat support shaft and the retaining member increases, the outer end portion of the seat support shaft can be more firmly fixed to the support groove, and the effect of preventing rotation can be increased.

(2) In the above item (1) , the tightening means includes a bolt inserted into the insertion groove from the front or rear of the side leg, and a female screw provided in the retaining member and engaged with the bolt. Shall be.

  With such a configuration, the work of fixing the seat support shaft to the support groove can be easily performed from the front or rear of the side leg.

(3) In the above item (1) or (2) , an inward bulge is provided on the inner side surface of the side leg, and a support groove and an insertion groove are provided in the bulge, and the insertion groove is opened. Is set to be larger than the vertical dimension of the seat support shaft.

  With such a configuration, the outer end portion of the seat support shaft can be easily fitted into the support groove from the front or rear of the side leg. It can be easily attached to or removed from the left and right side legs while being fixed.

  According to the present invention, the left and right outer end portions of the seat support shaft are engaged with the support groove on the inner surface of the side leg, and are wedged by the retaining member inserted into the insertion groove above the support groove. Since the seat support shaft is firmly fixed in the support groove, there is no possibility that the seat support shaft rattles in the vertical direction or comes off the side legs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an embodiment of a flip-up chair according to the present invention used in a theater or the like, and FIG. A chair 1 (hereinafter abbreviated as a chair) is connected to each other in the left-right direction. That is, each chair 1 includes a pair of left and right side legs 2 and 2 adjacent to each other that can be fixed to the floor with anchor bolts, a seat 3 that can be flipped up between them, and a backrest 4. It has become.

  As shown in the bottom view of FIG. 3 and the vertical cross-sectional side view taken along the line VI-VI of FIG. 3 (shown with the cover material on the bottom removed), the seat 3 is folded back and forth and left and right ( The upper side of the paper in FIG. 3 is a square having four frame plates 5 and short inwardly bent pieces 5a and 5b formed on the upper and lower ends of each frame plate 5 and having large openings on both upper and lower sides. 1 and 2, the opening on the lower surface of the seat frame 6 is closed by a cover member 7 attached to the lower surface. A plurality of seat springs 9 for the cushion body 8 mounted on the upper surface of the seat frame 6 are attached to the front and rear bent pieces 5 a and 5 a of the seat frame 6.

A seat support shaft 10 facing in the left-right direction is attached to the rear end portion of the seat frame 6 as follows.
As shown in FIGS. 3 to 6, the seat support shaft 10 has a pair of left and right shaft members 10 a, 10 a made of square tubes having a square cross section, and the opposite ends of the pair of left and right shafts facing downward and upward in a pair of side views. A split structure is formed by sandwiching and connecting to each other by means of the connecting rods 11, 11. Both connecting rods 11 have a U-shaped cross-section that is complementary to the outer shape of the connecting rod 11 so that the shaft member 10a can be externally fitted.

  Two right and left connecting holes 12 and 12 facing in the vertical direction are aligned with both ends of the upper and lower connecting rods 11 and 11 and the opposite ends of the left and right shaft members 10a and 10a, respectively. Four nuts 13 that are concentric with the connection hole 12 formed in the upper end of both ends of the upper connection rod 11 are welded.

  After the left and right shaft members 10a and 10a are spaced apart from each other by the required dimensions, the upper and lower connecting rods 11 and 11 are fitted to their opposite ends so that the connecting holes 12 are aligned vertically. The fixing bolt 14 inserted from below the connecting hole 12 in the lower connecting rod 11 is passed through the connecting holes 12 of both shaft members 10a and screwed into the nut 13 of the upper connecting rod 11, thereby The shaft members 10a are connected to each other so that they cannot rotate relative to each other and are separable, and this connection forms a seat support shaft 10 that is substantially united and has high torsional rigidity. The pair of upper and lower connecting rods 11, the plurality of nuts 13, and the plurality of fixing bolts 14 constitute a connecting means.

In the rear half of the seat frame 6 between the left and right bent pieces 5a and 5b, there are an upper piece 15a facing in the front-rear direction, a long downward piece 15b and a short downward piece 15c hanging from both side edges. The front U-shaped reinforcing members 15 and 15 are made to contact the upper piece 15a with the lower surface of the upper bent piece 5a, and two front and rear portions of the outer long downward piece 15b are The inner surfaces of the left and right frame plates 5 are fixed by bolts 16 and nuts 17.
An inward reinforcing plate 18 is bent at the front edges of the upper piece 15a and the outer long downward piece 15b in the left and right reinforcing members 15, and both the reinforcing plates 18 are formed on the rear frame plate 5. It is welded to the inner surface.

  As shown in FIG. 5, both sides of the rotation angle regulating member 19 of the seat 3 formed by bending an iron plate downwardly in a U-shape on the upper and rear surfaces of the outer end portions of the left and right shaft members 10a, 10a. The lower rear edges of the pieces 19a, 19a are welded. The lower end stopper portion 20 that stops the seat 3 at the lower limit rotation position that is a substantially horizontal use position by the upper end surface of the rotation angle regulating member 19 coming into contact with the lower surface of the upper piece 15a of the reinforcing member 15. In addition, the rear end of the side piece 19a having an inwardly long side is in contact with the lower surface of the upper piece 15a of the reinforcing member, so that the seat 3 is positioned at an upper limit that is an unused position facing obliquely upward. The upper limit stopper portion 21 is stopped at the rotation position.

  A torsion coil spring 22 that urges the seat 3 upward is loosely fitted to the shaft member 10a on the right side (left side in the bottom view in FIG. 3), and the foot piece 22a is connected to the rotation angle regulating member 19 on one side thereof. The left and right side pieces 19a are fitted into locking holes 23, 23 formed directly above the shaft member 10a from the inside. The other leg piece 22b of the torsion coil spring 22 is locked to a spring force adjusting member 40 described later for adjusting the spring force.

  Stepped bushes 24, 24 are press-fitted to the outer end portions of the left and right shaft members 10a, 10a, and the small diameter portions 24a of both stepped bushes 24 are shown in FIG. The plate 5 and a support hole 25 drilled in the rear portion of the outward downward piece 15b of the reinforcing member 15 fixed to the plate 5 are fitted so as to be rotatable from the inside. The rotation angle restricting members 19, 19 fixed to the left and right shaft members 10a, 10a are positioned directly below the upper pieces 15a of the left and right reinforcing members 15, 15.

  Between the opposite ends of the left and right shaft members 10a, 10a, their outer end portions can be removed inwardly from the frame plate 5 of the seat frame 6 and the downward pieces 15b of the reinforcing member 15 together with the stepped bush 24. A gap S is formed.

  Thus, after fitting the stepped bushes 24 of the left and right shaft members 10a, 10a to both side ends of the seat frame 6, the opposing end portions thereof are connected to the upper and lower connecting rods 11, 11 as described above. As a result, the seat support shaft 10 is substantially integrated, and the seat 3 is supported by the seat support shaft 10 so as to be rotatable around the left and right stepped bushes 24.

As shown in FIGS. 7-9, the protrusion edge part from the seat frame 6 in the shaft members 10a and 10a on either side is being fixed to the side leg 2 adjacent to each other as follows. In addition, since the fixing structure of both the shaft members 10a is bilaterally symmetrical, only one is demonstrated.
A bulging portion 26 protrudes inwardly from the inner surface of the front leg of the side leg 2 in the vertical direction, and the bulging portion 26 supports the side end portion of the shaft member 10a so as not to rotate. A support groove 27 having a U-shaped upward-facing side view that opens inward in a cross-sectional shape that is complementary to that, and a retaining member 28 that is continuously formed above the support groove 27 and opens rearward. The insertion groove 29 is formed, and the lower surface of the upper end of the insertion groove 29 is an inclined surface 30 that faces obliquely forward and downward so as to expand toward the opening. The vertical dimension of the opening that opens rearward in the insertion groove 29 is larger than the vertical dimension of the shaft member 10a, so that the shaft member 10a can be inserted with sufficient margin from the rear.
In addition, although illustration is abbreviate | omitted, the side leg 2 of the intermediate part which supports the opposing edge parts of the mutually adjacent chair 1 has the support groove | channel 27 and the insertion groove | channel 29 which are the same as the above on the both sides | surfaces. A bulging portion 26 is formed. The vertical dimension of the opening opening rearward in the insertion groove 29 is such that the shaft member 10a can also be inserted with a margin from the rear.

  As shown in enlarged views in FIGS. 10 and 11, the retaining member 28 has a vertical dimension that can be inserted into the insertion groove 29 from the rear side, and an inclined surface having the same inclination angle as the inclined surface 30 on the upper surface. 31 is formed. A recess 32 is formed on the inner surface of the retaining member 28 facing the side leg 2, and a female groove hole in the front-rear direction is formed in a rectangular groove 33 formed in the inner surface of the recess 32 that opens inward. A nut-like member 35 having 34 is fitted. An insertion hole 36 facing in the front-rear direction is provided at the center of the retaining member 28 so as to be coaxial with the female screw hole 34 of the nut-like member 35.

  In order to fix the shaft member 10 a to the side leg 2, before connecting the shaft members 10 a to each other by the connecting rod 11, the shaft end portion is fitted into the support groove 27 of the bulging portion 26 from the inside and supported. After that, the retaining member 28 is inserted into the insertion groove 29 above the support groove 27 from the rear, the upper inclined surface 31 is brought into contact with the inclined surface 30 of the insertion groove 29, and the lower surface is the upper surface of the shaft member 10a. Abut.

Next, a fixing bolt 39 inserted from the front into a large-diameter concave hole 37 formed in the front surface of the bulging portion 26 and a bolt insertion hole 38 formed in the back surface thereof facing in the front-rear direction is attached to the retaining member. 28 is inserted into the insertion hole 36 and screwed into the female screw hole 34 of the nut-like member 35, and tightened strongly. Then, due to the wedge action of the inclined surface 30 on the upper surface of the insertion groove 29 and the inclined surface 31 on the upper surface of the retaining member 28, the upper surface of the shaft member 10 a is strongly pressed downward by the retaining member 28, and the shaft member 10 a side The end portion is firmly fixed to the inner surface of the side leg 2 so as not to rotate. Therefore, there is no possibility that the seat support shaft 10 and the seat 3 supported thereby will rattle in the vertical direction, and the shaft member 10a may come off from the side legs 2.
If the fixing bolt 39 is loosened, the outer end portion of the shaft member 10a can be pulled out inward from the support groove 27 of the side leg 2.
After the left and right shaft members 10a attached to the seat frame 6 are connected to each other by the connecting rod 11, the outer ends of both shaft members 10a are inserted from the rear of the insertion grooves 29 of the left and right side legs 2 to support them. Both shaft members 10a may be fixed to the side legs 2 by dropping into the grooves 27 and inserting the retaining members 28 into the insertion grooves 29 from the rear.

  As in the above embodiment, the seat support shaft 10 has a split structure in which the opposing ends of the pair of left and right shaft members 10a, 10a are connected by the connecting rod 11, and between the opposing ends of both shaft members 10a. When the outer end portions of the shaft members 10a are fixed to the inner side surfaces of the side legs 2 so that the outer end portions can be removed from the seat frame 6, the outer end portions are fixed to the inner side surfaces of the side legs 2. By removing the connecting rod 11 with the seat 3 flipped up, not only the left and right shaft members 10a can be easily removed from the seat 3 while the left and right side legs 2 are fixed to the floor surface, 3 itself can also be easily removed from the left and right side legs 2.

  Accordingly, not only the work of assembling the shaft member 10a to the seat frame 6 and the side legs 2, but also the work of assembling or replacing the torsion coil spring 22 and the stepped bush 24 to the shaft member 10a can be easily performed. It can be carried out. In the above-described embodiment, the left and right shaft members 10a are made of square tubes, but may have a polygonal cross section of a quadrangle or more. At this time, the shape of the support groove 27 provided in the bulging portion 26 of the side leg 2 may be changed in accordance with the outer shape of the shaft member 10a.

  Further, only the outer end portion fixed to the side leg 2 in the shaft member 10a may have the above shape, and the other portion may have a circular cross section or the like.

  Furthermore, the upper surface of the outer end fixed to the side leg 2 in the shaft member 10a, that is, only the upper surface pressed by the retaining member 28 may have a non-circular cross section. Also at this time, the shape of the support groove 27 of the side leg 2 may be changed in accordance with the outer shape of the outer end portion of the shaft member 10a.

  In the above embodiment, the fastening means of the retaining member 28 is composed of the nut-like member 35 having the female screw hole 34 fitted to the retaining member 28 and the fixing bolt 39 screwed to the nut-like member 35. However, instead of the nut-like member 35, the retaining member 28 may be directly provided with a female screw.

  Further, in the above embodiment, the retaining member 28 is tightened from the front of the side leg 2, but it can be tightened from the rear. At this time, the inclined surface 30 of the support groove 27 and the inclined surface 31 of the retaining member 28 are inclined rearward and downward in the opposite direction, the insertion groove 29 is opened forward, and the retaining member 28 is moved forward. What is necessary is just to be able to insert more.

  Furthermore, the opposing surface of the insertion groove 29 and the retaining member 28 may be a flat surface, and the lower surface of the retaining member 28 may be an inclined surface that can press the shaft member 10a downward by a wedge action. In this case, at least a part of the upper surface of the shaft member 10a is preferably an inclined surface so as to be in surface contact with the inclined surface.

  As shown in FIG. 3 and FIG. 12, which is a sectional view taken along the line XII-XII, the torsion coil spring is interposed between the seat support shaft 10 and the side end portion of the rear frame plate 5 in the seat frame 6. The spring force adjusting member 40 made of hard synthetic resin for adjusting the spring force of 22 is provided as follows.

  The spring force adjusting member 40 has cam surfaces 41 to 44 that form four flat surfaces on the outer peripheral surface that are eccentric so that the dimension from the center of rotation is increased stepwise in the circumferential direction counterclockwise as viewed from the side. A concave groove 40a for locking the foot piece 22b of the torsion coil spring 22 is formed in the central portion of the outer peripheral surface.

  In the spring force adjusting member 40, a square shaft portion 45 a formed at the inner end of the rotation operation shaft 45 is press-fitted so as not to be relatively rotatable, and is inward from the spring force adjustment member 40 in the rotation operation shaft 45. The protruding shaft end is rotatably supported by an L-shaped bracket 46 welded to the reinforcing plate 18 on the inner surface of the rear frame plate 5. 47 is a flat washer fitted to the inner shaft end of the bracket 46, and 48 is a retaining pin for the flat washer 47.

The outer end portion of the rotation operation shaft 45 is inserted into shaft holes 49 and 49 formed in the side frame plate 5 and the outward downward piece 15b of the reinforcing member 15 fixed to the side frame plate 5 so as to rotate. It is supported movably.
The projecting end portion of the rotation operation shaft 45 that protrudes outward from the seat frame 6 is a corner shaft portion 45b for the rotation operation, and the end portion of the corner shaft portion 45b is as shown in FIG. By slightly projecting from the side end surface of the seat 3, the rotating operation shaft 45 and the spring force adjusting member 40 press-fitted thereto are used by using a tool inserted through a gap between the side leg 2 and the seat 3. It can be easily rotated from the outside.

  As shown in FIG. 12, the foot piece 22b of the torsion coil spring 22 is locked so as to contact the cam surface 41 of the spring force adjusting member 40 relatively long in the circumferential direction in a state where an initial spring force is applied. Thus, the seat 3 is always urged upward. From this state, the spring force adjusting member 40 is rotated clockwise as viewed from the side, and as shown in FIGS. By pressing the foot piece 22b, the spring force of the torsion coil spring 22 increases stepwise, and when the torsion coil spring 22 sags, the upward biasing force of the seat 3 is adjusted normally, The jumping speed of the seat 3 can be adjusted.

As shown in FIGS. 3 and 17, a damper mechanism 50 is provided in the side end of the seat frame 6 opposite to the torsion coil spring 22 so as to gently spring up the seat 3.
The damper mechanism 50 includes a known hydraulic cylinder type damper 51 (manufactured by FUJI SEIKI) and two link arms 52 and 52 on the left and right.

  The damper 51 is accommodated in a concave portion on the opposing surface of the pair of left and right holders 53, 53 made of synthetic resin, with the piston rod 51a projecting rearward. The damper 51 is attached to the piston rod 50a by being sandwiched between a pair of left and right mounting pieces 54a, 54a facing the front-rear direction in the bracket 54 welded to the inner surface of 15a, and fixed with set screws 55 from both sides. The rear end is provided substantially horizontally such that it is positioned immediately before the shaft member 10a.

  As shown in FIG. 5, the link arms 52, 52 are formed in a substantially downward U-shape so that the shaft member 10 a can be straddled from above, and the lower rear end of each of the link arms 52, 52 is one shaft member 10 a. It is pivotally attached to a pivotal support member 56 that is welded to the rear surface and is U-shaped upward in the rear view so as to be rotatable in the vertical direction. That is, after the lower ends of the link arms 52 are inserted between the upper pieces 56a and 56a of the pivot member 56 via the spacers 57, the left and right directions provided on the link arms 52 and the spacers 57 are The pin 60 inserted from the shaft hole 59 drilled in one upward piece 56a is inserted into the through hole 58 facing, and a screw is provided so that the male thread portion of the tip of the pin 60 is provided in the other upward piece 56a. By screwing into the hole 61, the rear end lower portions of the left and right link arms 52, 52 are pivotally attached to the rear surface side across the shaft member 10a.

The lower portions of the front ends of the left and right link arms 52, 52 are linked to the piston rod 51a of the damper 51 as follows.
A pin 63 is inserted into a left and right through hole 58 provided in a lower portion of the front end of both link arms 52 and a spacer 62 sandwiched between them, and a bottomed recess formed on the front surface of the spacer 62. 64, by fitting the rear end portion of the large-diameter portion 65 at the rear end portion of the piston rod 51a, the front end lower portions of both link arms 52 are connected to the rear end portion of the piston rod 51a via the pin 63, It is linked so that it can rotate up and down.
Instead of such a linkage form, a spacer 62 is integrally provided at the rear end of the piston rod 51a, and the rear end portion of the piston rod 51a is connected to the lower portion of the front end between the left and right link arms 52, 52 by a pin 63. You may pivot directly.
Both end portions of the pin 63 are fitted in a longitudinal hole 66 formed in the rear end portion of both mounting pieces 54a of the bracket 54 and facing in the front-rear direction so as to be slidable in the front-rear direction.

  As shown in FIG. 17, when the seat 3 is in a substantially horizontal use position, both link arms 52 face in the front-rear direction across the shaft member 10a, and the piston rod 51a of the damper 51 extends. When the seat 3 is flipped up from this state, as shown in FIG. 18, the link arm 52 is pivoted toward the cushion body 8 around the pivotal portion on the rear side, and pivotally coupled to the piston rod 51a. The piston rod 51a is retracted by gradually changing the portion forward from the shaft member 10a, and the oil in the damper 51 is gradually discharged from the orifice, so that the seat 3 jumps up gently. Become.

  In this way, the damper 51 is substantially horizontal and fixed to the seat 3, the rear end of the piston rod 51a straddles the shaft member 10a which is a part of the seat support shaft 10, and the rear end of the shaft member 10a. When pivotally attached to the front end of the link arm 52 pivotally attached to the rear side, the damper 51 and the front and rear pivot parts are arranged on a substantially horizontal straight line with the shaft member 10a interposed therebetween, so that the vertical dimension of the damper mechanism 50 is small. Thus, since the accommodation space can be small, the vertical dimension of the seat 3 can be reduced.

  Further, since the piston rod 51a is reciprocated through the link arm 52 that rotates upward, the stroke of the piston rod 51a is reduced, and a small damper 51 having a short overall length of the cylinder can be used.

  Furthermore, since the small damper 51 can be brought close to the seat support shaft 10, the damper mechanism 50 can be arranged compactly close to the seat support shaft 10 and can be accommodated in the seat 3 in the front-rear direction. There is no need to secure space.

It is a perspective view of one embodiment of the flip-up chair of the present invention. Similarly, it is a partially cutaway front view. Similarly, it is an enlarged bottom view of the seat with the cover member removed. It is the IV-IV line expansion vertical side view of FIG. It is a disassembled perspective view of a seat support shaft and a member assembled to it. FIG. 4 is an enlarged vertical side view of the VI-VI line in FIG. 3. It is a disassembled perspective view before a side leg and a shaft member fixation with respect to it. Similarly, it is an exploded perspective view after a shaft member fixation. It is the IX-IX line expansion vertical side view of FIG. It is an enlarged side view of a retaining member. It is the XI-XI line vertical side view of FIG. It is the XII-XII line enlarged vertical side view of FIG. Similarly, it is a vertical side view of the same portion as FIG. 3 when the spring force adjusting member is rotated. Similarly, it is a vertical side view of the same portion as FIG. 3 when the spring force adjusting member is further rotated. Similarly, it is a vertical side view of the same portion as FIG. 3 when the spring force adjusting member is further rotated. It is a perspective view which removes and shows one side leg of a chair. It is the XVII-XVII line enlarged vertical side view of FIG. Similarly, it is a vertical side view of the same portion as FIG. 3 when the seat is flipped up.

DESCRIPTION OF SYMBOLS 1 Seat raising type chair 2 Side leg 3 Seat 4 Backrest 5 Frame board 5a Bending piece 5b Bending piece 6 Seat frame 7 Cover material 8 Cushion body 9 Seat spring 10 Seat support shaft 10a Axis member 11 Connection rod 12 Connection hole 13 Nut 14 Fixing bolt 15 Reinforcement member 15a Upper piece 15b Downward piece 15c Downward piece 16 Bolt 17 Nut 18 Reinforcement plate 19 Rotation angle restricting member 19a Side piece 20 Lower limit stopper part 21 Upper limit stopper part 22 Torsion coil spring 22a Foot piece 22b Foot piece 23 Locking hole 24 Stepped bush 24a Small diameter portion 25 Support hole 26 Swelling portion 27 Support groove 28 Retaining member 29 Insertion groove 30 Inclined surface 31 Inclined surface 32 Recessed portion 33 Square groove 34 Female screw hole 35 Nut-shaped member 36 insertion hole 37 concave hole 38 bolt insertion hole 39 fixing bolt 40 spring force adjusting member 40a concave groove 41 cam surface 42 Surface 43 Cam surface 44 Cam surface 45 Rotating operation shaft 45a Square shaft portion 45b Square shaft portion 46 Bracket 47 Flat washer 48 Retaining pin 49 Shaft hole 50 Damper mechanism 51 Damper 51a Piston rod 52 Link arm 53 Holder 54 Bracket 54a Mounting piece 55 Set screw 56 Pivoting member 56a Upward piece 57 Spacer 58 Through hole 59 Shaft hole 60 Pin 61 Female screw hole 62 Spacer 63 Pin 64 Recessed part 65 Large diameter part 66 Long hole S Gap

Claims (3)

The seat support shaft that faces the left and right sides with the outer ends supported by the left and right side legs, allows the seat disposed between the both side legs to be rotated between a substantially horizontal use position and an upward non-use position. In the support type chair
On the inner side surfaces of the left and right side legs, there is a support groove that opens inward and forms a U-shape that is complementary to the outer shape of the outer end portion of the seat support shaft and opens inward. An insertion groove having an inclined surface that opens to one side and whose upper surface is inclined so as to expand toward the opening is provided so as to be continuous with each other, and the seat support shaft is provided in the support groove. And a retaining member having an upper surface with an inclined surface at the same angle as the inclined surface and a lower surface with a flat surface above the seat support shaft. face inclined surface abuts on the lower surface of the upper end of the insertion groove, and as the flat surface of the lower surface is mutually surface contact with the flat surface of the upper surface of the seat support shaft, inserted, by clamping means, said retaining tightened to move the member in a direction opposite to the opening of the insertion groove It allows the seat flip-up chair, characterized in that the outer end portion of the seat support shaft fixed to the support groove and pressed by wedge action. Clamping means, from the front or rear of the side legs, and a bolt inserted toward the insertion groove, formed in the retaining member, the seat of claim 1, wherein said bolt has consisted of a threaded internal thread A flip-up chair. An inwardly bulging portion is projected on the inner surface of the side leg, and a support groove and an insertion groove are provided in the bulging portion, and the vertical dimension of the opening of the insertion groove is larger than the vertical dimension of the seat support shaft. The flip-up chair according to claim 1 or 2 .

Images