JP5154101B2 - Chair flip-up chair - Google Patents

Description

  The present invention relates to a chair flip-up chair used in, for example, a seat for a theater or various stadiums, a lecture room, or a hall.

Some seat type flip-up type chairs can adjust the urging force of a spring that automatically raises the seat body when not in use (see, for example, Patent Documents 1 and 2).
JP-A-11-178669 JP 2006-152544 A

  In the chair described in Patent Document 1, when adjusting the upward biasing force of the seat body, one end of the torsion coil spring is temporarily removed from a plurality of engagement holes (grooves), Since it is necessary to select and re-engage the engagement holes, the work is troublesome, and it takes a lot of time to individually adjust a large number of chairs installed in a theater or the like.

The chair described in Patent Document 2 is such that the tip of the adjustment screw is locked to one end of the torsion coil spring, and the urging force of the torsion coil spring is adjusted by the screwing amount of the adjustment screw. As compared with the apparatus described in No. 1, adjustment work is easy.
However, the torsion coil spring is fitted to a pivot that rotatably supports the rear end of the seat between the opposing surfaces of the left and right legs (posts), and is screwed into the support frame below the pivot from below. Since the lower surface of one end of the spring is locked to the upper end of the adjustment screw, the left and right legs obstruct the work and cause the work to bend down when the adjustment screw is rotated. So workability is bad.
Moreover, since the torsion coil springs of Patent Documents 1 and 2 are both exposed and assembled to the outside, they do not look good when the seat body is flipped up.

  The present invention has been made in view of the above-described problems, and makes it possible to easily adjust the urging force of the torsion coil spring that flips up the seat body from the open space in front of the pedestal, and the torsion coil spring is externally provided. An object of the present invention is to provide a seat flip-up chair that can be improved in appearance without being exposed to the body.

According to the present invention, the above problem is solved as follows.
(1) The seat is supported by the left and right pedestals so that the seat can be rotated between a use position that is substantially horizontal and a non-use position that faces the front upper side. In a seat flip-up chair that can automatically rotate from a use position to a non-use position, both side surfaces of the rear end of the seat body are pivotally attached to the inner surface of the pedestal. A pair of left and right brackets facing in the front-rear direction are attached so as to protrude forward from the pedestal , and a housing part that opens inward is provided on the inner surface of at least one of the brackets. A cylindrical portion having a shaft hole that opens inwardly is provided on the inner surface of the portion so as to project inward in the left-right direction, and a torsion coil spring as the biasing means is provided in the housing portion so as to surround the cylindrical portion. A rotating bracket that accommodates and supports a seat body in the shaft hole of the cylindrical portion A pivot projecting from the outer surface by rotatably fitted to said bracket, said hinge bracket, connected so as to be able to rotate in the vertical direction and in front of the pedestal in the one bracket the part amount of projecting, the outer surface of the bracket is provided with a female screw hole which opens into the housing portion of the torsion coil spring, the female screw hole, the adjusting screw, by its front end, one end of the torsion coil spring The foot pieces are screwed together so that they can be pressed in the direction in which the torsional load of the torsion coil spring is increased.

(2) In the above item (1), the female screw hole is provided in the upper part of the bracket so as to face substantially in the vertical direction.

(3) In the above paragraph (1) or (2), between the bracket, the pivot bracket that is pivotally attached to the inner surface of the front end portion thereof, and that supports the seat, and between the opposing surfaces of the bracket and the pivot bracket The torsion coil spring housed in the housing portion constitutes a seat body support unit, and the bracket is provided with a latching long hole for slidably fitting a foot piece on one end side of the torsion coil spring. At the same time, the pivot bracket is provided with a retaining hole for retaining the foot on the other end of the torsion coil spring.

(4) In the above item (3), the female screw hole is provided so as to open toward the latching long hole, and the foot piece fitted in the latching long hole can be pressed by the tip of the adjusting screw. To.

(5) In any one of the above items (1) to (4), a plurality of protrusions are fitted to one of the inner surface of the pedestal and the outer surface of the bracket, and the other is fitted to the protrusion. Recessed portions are provided respectively.

According to the invention described in the above item (1), the torsion coil spring is simply operated by rotating the adjusting screw in the screw hole in order to provide the bracket with the one end of the torsion coil spring accommodated in the bracket. The urging force of the seat body, that is, the lifting force of the seat body can be easily adjusted.
Also, female screw hole, so is provided in part component which projects forwardly from the pedestal in brackets, from the front of the open space of the pillar, the adjustment screw can be operated to rotate, flip-up of the seat support It is possible to easily adjust the force.
Furthermore, since the torsion coil spring is housed in a housing portion provided on the inner side surface of the bracket and is not exposed to the outside, the appearance when the seat body is flipped up is improved.

According to the invention described in the above item (2) , the female screw hole is provided in the upper part of the bracket in front of the pedestal so as to face substantially in the vertical direction. The adjustment screw can be rotated with an extremely easy posture.

According to the invention described in (3) above , the torsion coil spring is completely hidden by the bracket and the pivot bracket pivotally attached thereto, and is easy to assemble, and the bracket, pivot bracket, Since only the rear end portion of the bracket needs to be fixed to the inner side surface of the pedestal in a state in which the torsion coil spring is assembled in advance to form a unit, the assembling work becomes efficient.
In addition, the foot piece on one end side of the torsion coil spring is movably fitted in a latching long hole provided in the bracket, and in this state, the foot piece is pressed by an adjusting screw in the screw hole for providing in the bracket. Therefore, the foot piece is prevented from wobbling when adjusting the biasing force of the torsion coil spring.

According to the invention described in the above item (4) , the female screw hole opens toward the latching long hole, and the foot of the torsion coil spring fitted in the latching long hole is directly connected by the adjusting screw. Since it can press, a foot piece can be pressed stably and reliably.

According to the invention described in the above item (5), the positioning when attaching the bracket to the pedestal is facilitated, and the downward direction acting on the rear end portion of the bracket attached to the pedestal so as to protrude forward is provided. Since the rotational moment can be received by the protrusion and the recess, the mounting strength of the rear end portion of the bracket to the pedestal can be increased.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a seat body flip-up type connecting chair to which the present invention is applied, FIG. 2 is a perspective view of the seat body in a non-use state, and FIG. 3 is an enlarged side view. FIG.

  As for the connecting chair, a plurality of (three) single chairs 2 are attached between adjacent ones of a plurality of left and right (four in the embodiment) pedestals 1 fixed on the floor with anchor bolts or the like at predetermined intervals. Configured.

  Each pedestal 1 is formed of, for example, an aluminum alloy so that the upper part is tilted backward, and an armrest 4 having an upper surface with an armrest 3 made of a cushioning material attached to the upper surface thereof is integrally provided in a forward direction. Has been.

  Each single chair 2 includes a backrest 5 in which the lower half is fixed to the opposite surface (inner side surface) of the rear end portion of the pedestal 1 adjacent to each other, and the middle part of the two pedestal columns 1. The seat body support unit 8 includes a pair of left and right brackets 6 fixed to the side and facing the front and a pair of left and right pivot brackets 7 whose rear ends are pivotally attached to the front ends thereof. The seat body 9 is supported by the left and right sides of the rear end.

  4 to 7 are perspective views showing details of the seat body support unit 8. FIGS. 4 and 5 show the state before the seat body support unit 8 is attached to the pedestal 1 as seen from the opposite directions. FIG. 6 and FIG. 7 are exploded perspective views of the state after the seat support unit 8 is attached to the pedestal 1 as seen from the left and right opposite directions. The left and right pedestals 1 and the pair of left and right seat support units 8 that support the seats 9 of the individual chairs 2 have the same structure and are different from each other. Only the left pedestal 1 and the seat support unit 8 attached to the inner surface of the pedestal 1 will be described, and detailed description of the others will be omitted.

  As shown in FIGS. 4 and 5, the bracket 6 is a die-cast product such as an aluminum alloy, for example. The side wall 10 faces in the front-rear direction and the front surface that is continuously inwardly connected to the outer peripheral edge forms an arc surface. The peripheral wall 11 forms a case that opens inward. A plurality of reinforcing ribs 12 and protrusions 13 protrude from the rear inner surface of the side wall 10 surrounded by the peripheral wall 11.

As shown in the cross-sectional view of FIG. 10, a cylindrical portion 15 having a shaft hole 14 opening inwardly protrudes inward in the left-right direction on the inner side surface on the front side of the side wall 10.
Further, a thick part 16 is formed on the inner side surface of the front side of the side wall 10 so as to surround the cylindrical part 15, and the thick part 16 has a pair of arcuate shapes centering on the cylindrical part 15. Guide recesses 17 and 17 are formed so as to face each other with the cylindrical portion 15 interposed therebetween (see FIG. 8). The details of the guide recesses 17 will be described later, but restrict the range of rotation of the seat body 9 in the vertical direction. A fitting groove 18 is formed between the tubular portion 15 and the thick portion 16 as a housing portion into which the torsion coil spring 19 is loosely fitted.

  As shown in FIG. 5, a circular concave portion 20 concentric with the cylindrical portion 15 is formed on the outer surface of the side wall 10 of the bracket 6, and the side wall 10 in the circular concave portion 20 is for attaching the rotating bracket 7. A through hole 23 into which the bolt 21 and the cylindrical spacer 22 are fitted is formed so as to be concentric with the cylindrical portion 15 and communicate with the shaft hole 14.

  Reference numeral 24 denotes a circular cover for the circular recess 20, and the three engagement pieces 25 protruding from the inner surface of the circular cover 20 are fitted into the three engagement holes 26 formed in the side wall 10 in the circular recess 20. By doing so, it is fixed to the circular recess 20 (see FIG. 10).

  A foot piece 19a on one end side (outer end side) of the torsion coil spring 19 moves up and down into a latching long hole 27 that is formed in the side wall 10 in the circular recess 20 and has an arc shape in the vertical direction. The other end side (inner end side) foot piece 19b is latched in a later-described latching hole 43 provided in the rotating bracket 7. It has become.

  In the middle part in the front-rear direction of the bracket 6, a thick-walled part 16 above the latching long hole 27 and a female screw hole 28 that passes through the peripheral wall 11 and faces in the vertical direction are communicated with the upper end of the latching long hole 27. An adjustment screw 29 having a hexagonal hole (not shown) on the upper surface is screwed into the female screw hole 28 so that its lower end can come into contact with the upper surface of the foot 19a of the torsion coil spring 19. (See FIG. 11).

  As shown in the enlarged views of FIGS. 4 and 8, three mounting holes 30 facing in the left-right direction are provided through the rear portion of the bracket 6, and are closer to the front portion on the inner side surface of the intermediate portion of the pillar 1. Inwardly projecting three inwardly projecting portions 31 are formed with female screw holes 32 opened inward so as to be aligned with the respective mounting holes 30.

  As shown in FIG. 5, the upper and lower positioning holes 33 are formed in the side wall 10 between the upper and lower mounting holes 30, and both positioning holes 33 are formed on the pedestal 1 as shown in FIG. The upper and lower positioning protrusions 34, 34 projecting from the inner surface are fitted and positioned.

As described above, when the positioning hole 33 is fitted to the positioning protrusion 34, not only the positioning is facilitated, but also the downward rotation moment acting on the rear end portion of the bracket 6 is applied to the positioning protrusion 34 and the positioning hole 33. Therefore, it is possible to increase the attachment strength of the rear end portion of the seat body support unit 8 to the pedestal 1. In contrast to the above, a positioning protrusion may be provided on the bracket 6 side and a positioning hole may be provided on the pedestal 1 side.
At the side edge of the front end portion in the intermediate portion of the pedestal 1, a notch recess 1 a is formed for fitting the outer end portion of the bracket 6 to perform vertical positioning.

  As shown in FIG. 5, in order to make the pedestal column 1 common, the female screw holes 32 and the positioning projections 34 are provided on the left and right side surfaces of each pedestal column 1 and are arranged on the outermost side. The female screw hole 32, the positioning protrusion 34, and the like in the pedestal 1 are covered with a cover (not shown).

  After the positioning holes 33 are fitted into the positioning protrusions 34, the brackets 6 can be attached to the leg 6 by tightening the front end portions of the bolts 35 inserted into the mounting holes 30 from the inner side into the female screw holes 32, respectively. The front half is fixed to the inner side surface of the intermediate part of the column 1 with the front half projecting forward of the leg column 1.

  As shown in FIGS. 4, 5, and 10, the rotating bracket 7 described above stands from an inward horizontal piece 36 fixed to the lower surfaces of the left and right side portions of the rear end portion of the seat body 9 and its outer end. It is made of a steel plate provided with an upward piece 37 whose vertical dimension is gradually increased toward the rear. A large diameter hole 38 and two small diameters facing each other are formed at the rear end of the upward piece 37. The holes 39 are formed so that the outer peripheral edges are continuous with each other.

  On the inner side surface of the rear end portion of the upward piece 37, there are a pivot 40 that is outward in the left-right direction, and a pair of outward stopper pins 41, 41 that are opposed to each other in the radial direction across the pivot 40. The metal reinforcing plate 42 welded to the side surface is fixed by welding with the pivot 40 positioned at the center of the large-diameter hole 38 and the stopper pins 41 inserted through the small-diameter hole 39. The reinforcing plate 42 is provided with a latching hole 43 for latching the foot piece 19b on the inner end side of the torsion coil spring 19.

  It should be noted that the positional relationship between the hooking hole 43 and the hooking long hole 27 provided in the bracket 6 and the two leg pieces 19a and 19b in the torsion coil spring 19 is such that the rotating bracket 7 or the seat body 9 attached thereto is horizontal. When the torsion coil spring 19 is rotated in the direction, a torsional load is applied to the torsion coil spring 19, and the seat body 9 is automatically raised by the upward biasing force generated by the torsional load.

In the center of the pivot 40, a female screw hole 44 that is open to the outside and into which the bolt 21 can be screwed is formed.
A cylindrical cushioning material 45 made of rubber or the like is press-fitted to both stopper pins 41.

  In order to attach the rotating bracket 7 to the bracket 6, first, the torsion coil spring 19 is accommodated in the fitting groove 18 formed on the inner surface of the bracket 6, and the foot 19 a on the outer end side thereof is connected to the side wall of the bracket 6. It is loosely fitted in the ten retaining long holes 27.

  Next, after the foot 19b on the inner end side of the torsion coil spring 19 is fitted into the retaining hole 43 of the rotating bracket 7, as shown in FIGS. 8 and 10, the shaft hole of the cylindrical portion 15 of the bracket 6 is used. The pivot shaft 40 of the rotating bracket 7 is fitted to the bushed bush 46 press-fitted to the base plate 14 so that the pair of stopper pins 41 and 41 are positioned in the pair of guide recesses 17 and 17 of the bracket 6. Fits in a pivotable manner. In addition, the operation | work which engages and latches the leg piece 19b of the torsion coil spring 19 in the latching hole 43 of the rotation bracket 7 makes the torsion coil spring 19 an unloaded state, that is, the rotation bracket 7 is slanted. If it is performed in a state of being turned upward, it is easy to work.

  Next, the spacer 22 and the bolt 21 are sequentially fitted into the through hole 23 of the side wall 10 of the bracket 6, and the tip end of the bolt 21 is screwed into the female screw hole 44 of the pivot 40 and tightened. At this time, the distal end of the spacer 22 abuts on the end surface of the pivot 40, and the tightening force of the bolt 21 is not directly applied to the bracket 6 and the rotating bracket 7. Can be rotated without any hindrance. The head of the bolt 21 is blindfolded by a circular cover 24 that is fixed to the circular recess 20 of the side wall 10.

  6 and 7 show a state where the seat support unit 8 has been attached to the pedestal 1, and finally, the seat 9 may be attached to the inward horizontal piece 36 in the left and right pivot brackets 7. 6 and 7 show a state in which the rotating bracket 7 is rotated downward for convenience, but in practice, as shown by a two-dot chain line in FIG. Due to the force, the rotating bracket 7 becomes a non-use position that faces diagonally forward and upward.

  As shown in FIGS. 8 and 9, when the rotating bracket 7 rotates in the vertical direction, the pair of stopper pins 41, 41 provided on the rotating bracket 7 rotate in the pair of guide recesses 17, 17 of the bracket 6. However, the stop position at the non-use position of the rotation bracket 7 can be adjusted as follows.

  As shown in FIG. 8, immediately below the guide recess 17 on the rear side of the bracket 6, a lower end surface and a lower end of the guide recess 17, that is, one end on the side where the stopper pin 41 rotates in the standing direction of the seat body 9. A second female screw hole 47 that opens in the upward and downward direction is provided. The second female screw hole 47 has a small-diameter protrusion 48 on the upper end surface and a hexagonal hole (not shown) on the lower end surface. ) Having a second adjusting screw 49.

  The lower surface of the cushioning material 45 fitted to the stopper pin 41 is in contact with the upper end of the small-diameter protrusion 48 of the second adjustment screw 49. Therefore, the stop position of the rotation bracket 7 at the non-use position can be adjusted by changing the amount of protrusion of the second adjustment screw 49 into the guide recess 17.

  As described above, when the stop position of the rotation bracket 7 at the non-use position can be adjusted, especially in the connecting chair, even if an assembling error or the like occurs in each member, all the seat bodies 9 arranged in the left-right direction are inoperable. The upward position at the time of use can be aligned with the fixed position, and the appearance is improved. The female screw hole 47 is provided below the bracket 6 in order to prevent the female screw hole 47 from being noticeable. However, the female screw hole 47 is provided directly above the front guide concave portion 17 to provide an upper end of the front stopper pin 41. May contact the lower end of the second adjustment screw.

  As shown in FIG. 9, when the pivot bracket 7 is pivoted to a substantially horizontal position, the cushioning material 45 fitted to both stopper pins 41 is rotated in each guide recess 17 (counterclockwise). By abutting on one end surface of the rotary bracket 7, the rotating bracket 7 and the seat body 9 attached thereto are stopped at the use position.

On the other hand, the flip-up force of the rotating bracket 7 and the seat 9 attached thereto can be adjusted as follows.
As shown in FIG. 11, a leg piece 19 a on one end side of the torsion coil spring 19 is loosely fitted in a vertically extending manner in the latching long hole 27 provided in the bracket 6 so as to be vertically movable, and the latching long hole is provided. Since the adjustment screw 29 is screwed into the female screw hole 28 that is formed directly above 27 and faces the upper end of the foot piece 19a, the adjustment screw 29 is screwed downward. Then, the foot piece 19a is pressed downward.

As a result, the initial torsional load of the torsion coil spring 19 is increased, and the upward biasing force of the rotating bracket 7 is increased, so that the lifting force of the seat body 9 is also increased.
Therefore, when the torsion coil spring 19 sags due to long-term use, the torsional load can be increased to optimally adjust the lifting force of the seat body 9.
In addition, if the position of the latching long hole 27 for latching the leg piece 19a of the torsion coil spring 19 and the female screw hole 28 communicating with the leg piece 19a is a position that does not interfere with the female screw hole 47, the position of the front end portion of the bracket 6 is determined. It may be provided at a position, and in this case, the position of the foot piece 19a in the circumferential direction may be changed corresponding to the position.

Contrary to the above, the latching hole 43 on the side of the rotating bracket 7 that latches the other foot piece 19b is a long hole, and the foot piece 19b fitted in this long hole is formed as described above. It can also be made to press. At this time, it is only necessary to increase the plate thickness of the rotating bracket 7 at least in the portion where the retaining hole 43 is provided so that the same female screw hole 28 as described above is provided.
The female screw holes 28 and 47 are preferably closed with a cap or the like after adjustment or when adjustment is not necessary.

  As described above, in the flip-up chair of the above-described embodiment, the torsion coil spring 19 is accommodated in the bracket 6 whose rear end is fixed to the pedestal 1, and the foot piece 19 a on one end side thereof is attached to the bracket 6. The urging force of the torsion coil spring 19, that is, the flip-up force of the seat body 9 can be easily adjusted simply by pressing with the adjusting screw 29 screwed into the female screw hole 28.

In addition, since the female screw hole 28 is provided at an upper part of the bracket 6 so as to open upward at a portion protruding forward from the leg column 1, an adjustment screw is provided from the open space above the front side of the leg column 1. 29 can be rotated in an extremely easy posture, and the adjustment work of the flip-up force of the seat body 9 can be easily performed.
Further, the torsion coil spring 19 is completely concealed by the brackets 6 and 7 and is not exposed to the outside, so that the appearance is improved.

  Only the second adjustment screw 49 screwed into the second female screw hole 47 of the bracket 6 is rotated at the upward stop position of the rotation bracket 7 and the seat body 9 supported thereby by the unused position. Thus, it is possible to adjust easily and accurately, and it is possible to align all the seats 9 arranged in the left-right direction in a large number of connecting chairs installed in a theater or the like in a good position.

  Moreover, since the 2nd female screw hole 47 is provided in the part which protrudes ahead rather than the pedestal 1 in the bracket 6 similarly to the above, using the open space of the front lower direction of the pedestal 1, The second adjustment screw 49 can be rotated, and the adjustment work of the upward stop position of the seat body 9 can be easily performed.

  The seat support unit 8 includes a bracket 6, a pivot bracket 7 pivotally attached to the bracket 6, and a torsion coil spring 19 accommodated between the brackets 6, 7. The rear end of the pivot bracket 7 is pivotally attached to the front end of the bracket 6 so as to be positioned in front of the pedestal 1, and the rear end of the bracket 6 is fixed to the inner surface of the footnote 1. Therefore, both the brackets 6 and 7 and the torsion coil spring 19 are assembled in advance, and the seat support unit 8 can be easily attached to the pedestal 1 in a unitized state, and the assembling work becomes efficient.

In the above-described embodiment, the pivot 40, the stopper pin 41, and the fitting groove 18 of the torsion coil spring 19 are provided on the rotating bracket 7 side, the cylindrical portion 15 in which the pivot 40 is fitted on the bracket 6 side, and the stopper. The guide recesses 17 of the pins 41 are respectively provided. On the contrary, the pivot 6, the stopper pin and the fitting groove are provided on the bracket 6 side, and the tube portion and the guide recesses are provided on the rotation bracket 7 side. May be provided respectively.
At this time, the upward piece 37 of the rotating bracket 7 may be formed in a case shape with an open outer surface, and the bracket 6 may be formed in a plate shape.
It is also possible to omit the rotating bracket 7, and in this case, the pivot 40 and the stopper pin 41 may be provided directly on the side surface of the seat body 9.

  Furthermore, in the above-described embodiment, a pair of stopper pins 41 are provided and are loosely fitted in a pair of opposing guide recesses 17, but the stopper pin 41 on the side in contact with the second adjustment screw 49 and its Only the guide recess 17 may be provided, and the other stopper pin 41 and the guide recess 17 may be omitted.

  In the above embodiment, the female screw hole 28 into which the adjusting screw 29 is screwed is provided so as to open toward the latching long hole 27, but the fitting groove (accommodating) in which the torsion coil spring 19 is accommodated. And the foot 19a of the torsion coil spring 19 may be pressed with the adjusting screw 29 from above. At this time, an upward concave groove or the like into which the foot piece 19a is fitted is provided on the lower surface of the adjusting screw 29 so as to prevent the positional deviation of the contact portion between the lower surface of the adjusting screw 29 and the foot piece 19a. It is good to do.

  In the above embodiment, both the left and right seat support units 8 are provided with the torsion coil spring 19 and the spring force of the seat 9 and the female screw holes 28 and 47 for adjusting the upward stop position. It may be provided only on one side.

It is a perspective view at the time of seat use in the connection chair to which the present invention is applied. Similarly, it is a perspective view when the seat body is not used. Similarly, it is an enlarged side view. It is the disassembled perspective view which looked at the state before the seat body support unit attachment to a pedestal from the right side. Similarly, it is an exploded perspective view seen from the left. It is the perspective view which looked at the state after the seat body support unit attachment to a pedestal from the right side. Similarly, it is the perspective view seen from the left. It is an expansion inner side view of the principal part when a rotation bracket is made into a non-use position. Similarly, it is an expansion inner side view of the principal part when it is set as a use position. FIG. 10 is an enlarged cross-sectional plan view taken along line X-X in FIG. 9. Similarly, it is an XI-XI line enlarged vertical side view.

DESCRIPTION OF SYMBOLS 1 Leg pillar 1a Notch recessed part 2 Single chair 3 Armrest 4 Armrest 5 Backrest 6 Bracket 7 Rotating bracket 8 Seat body support unit 9 Seat body 10 Side wall 11 Peripheral wall 12 Rib 13 Protrusion 14 Shaft hole 15 Tube part 16 Thick wall Part 17 Guide recess 18 Fitting groove (accommodating part)
DESCRIPTION OF SYMBOLS 19 Torsion coil spring 19a Foot piece 19b Foot piece 20 Circular recessed part 21 Bolt 22 Spacer 23 Through-hole 24 Circular cover 25 Engagement piece 26 Engagement hole 27 Elongation long hole 28 Female screw hole 29 Adjustment screw 30 Mounting hole 31 Inward protrusion 32 Female screw hole 33 Positioning hole (concave)
34 Positioning protrusion (protrusion)
35 Bolt 36 Inward horizontal piece 37 Upward piece 38 Large diameter hole 39 Small diameter hole 40 Axis 41 Stopper pin 42 Reinforcement plate 43 Retaining hole 44 Female thread hole 45 Buffer material 46 Bushing bush 47 Second female thread hole 48 Small diameter protrusion Part 49 Second adjusting screw

Claims (5)

The left and right pedestals support the seat so that it can rotate between a use position that is substantially horizontal and a non-use position that faces front and upward, and the seat is used by the biasing means. In a seat flip-up chair that can automatically rotate from a position to a non-use position,
A pair of left and right brackets facing in the front-rear direction in which both side surfaces of the rear end of the seat body are pivotally attached to the inner side surface of the pedestal are attached so as to protrude forward from the pedestal. At least one of the inner side surfaces is provided with a housing portion that opens inward, and a cylindrical portion that has a shaft hole that opens inwardly is provided on the inner surface of the housing portion so as to protrude inward in the left-right direction. A torsion coil spring as the urging means is accommodated in the accommodating portion so as to surround the cylindrical portion, and a pivot projecting from the outer surface of the rotating bracket supporting the seat body is provided in the axial hole of the cylindrical portion. thereby rotatably fitted to said bracket, said hinge bracket, connected so as to be able to pivot vertically, and in part component which projects forwardly of the pedestal in the one bracket, bracket the outer surface of the housing portion of the torsion coil spring An open female screw hole is provided, and an adjustment screw is inserted into the female screw hole so that the foot on one end side of the torsion coil spring can be pressed in the direction in which the torsion load of the torsion coil spring becomes large. A seat-type flip-up chair characterized by being screwed onto.   2. The seat body flip-up chair according to claim 1, wherein the female screw hole is provided in the upper part of the bracket so as to face substantially in the vertical direction.   A bracket, a pivot bracket pivotally attached to the inner side surface of the front end portion thereof, and a seat bracket, and a torsion coil spring accommodated in an accommodating portion between opposing surfaces of the bracket and the pivot bracket. The support unit is configured, and the bracket is provided with a latching long hole that movably fits and latches a foot piece on one end side of the torsion coil spring, and the other end of the torsion coil spring is provided on the rotating bracket. The seat body flip-up chair according to claim 1 or 2, wherein a latching hole for latching a foot piece on the side is provided.   The seat body according to claim 3, wherein the female screw hole is provided so as to open toward the hooking long hole, and the foot piece fitted in the hooking long hole can be pressed by the tip of the adjusting screw. A flip-up chair.   Either one of the inner surface of a pedestal and the outer surface of a bracket is provided with a plurality of protrusions, and the other is provided with a recess that fits into the protrusions. The chair flip-up chair described in 1.

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