JP3314354B2 - Bouncer shock absorber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning device for a flip-up rotary chair, which freely supports a seat installed in a theater, an auditorium, a hall or the like.

[0002]

2. Description of the Related Art As is well known, a flip-up rotary chair is
The seat is rotatably supported on the frame via a spindle, and the seat is flipped up when not in use, and the seat is tilted forward to allow horizontal support when in use, but it can be used when not in use and when not in use. In order to maintain a constant posture of the seat, an abutment part and a stopper are provided on the frame side and the seat side of the chair so that they abut each other, so that the chair will be in a vertical posture when it jumps up and a horizontal posture when it is brought forward. It is usually made to be able to hold.

[0003] The abutment portion and the stopper, which regulate the rotation range of the seat and maintain a fixed posture, respectively, generate a collision sound during the rotation operation of the seat. Therefore, one of the cushioning members made of rubber or soft synthetic resin is used. In addition, it absorbs shocks and suppresses sound generation. There are various methods for mounting the cushioning material, but in general, fastening with screws or bolts or pasting with an adhesive, both of which are common, and furthermore, a concave portion is provided in a portion where the cushioning material is attached. They are also provided and fitted.

[0004] However, mounting with screws, bolts, or adhesives is not possible even when used together with the formation of the concave portion, which causes a problem in durability and a problem in mounting work. In particular, rubber and the like are deformed into various shapes depending on their strength when abutting against the stopper. However, since the screws, bolts or recesses are not deformed at all, there is a problem that the cushioning material itself cannot withstand an impact and is damaged. If this is due to the adhesive, it will be peeled off or cracked from the bonded part and fall off.

[0005]

SUMMARY OF THE INVENTION The present invention has been developed with a view to solving such problems in the cushioning device for a seat in a flip-up rotary chair. The present invention is intended to provide a shock absorber in which a stable mounting of the mounted shock absorbing material can be expected, and in addition to a shock absorbing effect, a stable seating feeling can be obtained when seated.

Further, the present invention makes it possible to easily mount the cushioning material on the abutting portion formed in advance without requiring a troublesome operation such as tightening the cushioning material with screws or bolts or bonding with an adhesive. An object of the present invention is to provide a shock absorbing device for a flip-up swivel chair, which can be easily removed from the part and replacement work of the shock absorbing material can be performed extremely easily.

[0007]

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned object, and a right and left frame of a chair is provided with an abutment portion having a mounting groove in advance, and rubber and soft synthetic resin are formed in the mounting groove. When an elastic cushioning member made of, for example, is fitted and supported, a stopper provided on a rotatably supported seat is directly abutted against the cushioning member to absorb an impact force, while the seat is horizontally supported to support a seated person. With this stopper, the cushioning material is crushed and compressed, the whole is pushed into the inside of the mounting groove, and the stopper is directly abutted against the abutting portion, so that the abutting state is stabilized and the posture of the seat can be fixed. Another object of the present invention is to provide a flip-up rotary shock absorber that can give a seated person a sense of stability.

The feature of the present invention will be described in more detail. In the present invention, a seat is rotatably supported on a chair frame via a support shaft, and an abutting portion provided on the chair frame when the seat is folded down horizontally. In a flip-up chair in which a stopper provided on the seat is abutted and held in a horizontal position, the abutting portion is provided with a mounting groove that opens toward the stopper that pivots on a support shaft as a fulcrum. A cushioning device for a flip-up rotary chair characterized in that an elastic cushioning material is fitted and supported, and a part of the cushioning material is projected outward from the groove opening, and the stopper is abutted against the projected portion. To provide.

The present invention also provides a shock absorbing device for a flip-up chair according to the above description, wherein the mounting groove has an opening smaller than the width of the internal space so as to prevent the elastic cushioning material from coming out of the opening. To provide.

[0010] The present invention also provides a cushioning device for a flip-up chair, wherein the mounting groove has a dovetail shape.

The present invention also provides a shock absorbing device for a flip-up chair, wherein the elastic cushioning material is rubber or elastic soft resin in the above description.

Further, in the above description, the elastic cushioning material is formed in a columnar shape in which the elastic cushioning material is accommodated in the mounting groove and a part of the peripheral surface protrudes from the groove opening. Is to provide.

Still further, according to the present invention, in the above description, the mounting groove has a smaller opening width than a width of the internal space,
The elastic cushioning material which is fitted and supported by partially projecting out from the opening has a sectional area equal to or smaller than the sectional area of the mounting groove, and is crushed by abutment with the stopper and compressed. An object of the present invention is to provide a shock absorbing device for a flip-up chair, wherein the whole of the elastic shock absorbing material can be retracted into the mounting groove. Next, embodiments of the present invention will be described with reference to the drawings.

[0014]

Embodiment

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in the drawings is an example in which a shock absorbing device according to the present invention is applied to a folding chair in which a seat provided on a deck of a telescopic movable seat is flipped up and rotated freely. Although the folding chair for grandstands is described here, the structure for flipping up and rotating the seat is the same for the theater-connected chair and the chair installed in the multipurpose hall, etc., and the rotation of the seat is restricted. It will be evident in the following description that the shock absorber of the present invention can be similarly implemented.

FIG. 1 of the accompanying drawings shows that the chair on the front deck is erected in a state where the deck on the bleachers is extended and the chair on the rear deck is folded down on the deck. FIG. 2 is a right side view of the chair in a folded state, FIG. 2 is a front view showing a chair that has been raised upright on a deck, and FIG. FIG. 4 is an enlarged right side view of a main part in a state where the seat is flipped up and raised, and FIG. 5 is an enlarged right side view of a main part in a state where the seat is tilted horizontally and seated. , FIG.
FIG. 7 is an enlarged front view showing a partial cross section of a main part in a state where the seat is folded down horizontally so that the seat can be seated. FIG. 7 is an enlarged exploded perspective view of the main part.

Reference numeral 1 in the drawing denotes a movable spectator main body which expands and contracts in the front-rear direction (the left side is the front in FIG. 1), 2a and 2b denote decks of the spectators alone 1a and 1b arranged in front and rear, 3a and 3b are pillars supporting the deck,
Reference numerals 4a and 4b denote movable carts provided laterally at the lower ends of the columns and equipped with front and rear wheels 5.

As is well known, the movable spectator body 1 shown here has a plurality of spectator seats 1a, 1 with different deck heights sequentially.
b are arranged in the front-rear direction, the front-back singles are connected to each other in the front-back direction, and the front-end single-unit is pulled out at the time of extension. Back down and put it under the next single deck, and then put this fitted single under the next single deck to create a weighting state sequentially and finally the last It can be stored under the deck of a section and can be retracted and stored in a shelf shape as a whole.

The grandstand body 1 shown in FIG. 1 shows the frontmost unit 1a and the next unit 1b of the above configuration, and each of the decks 2a and 2b has a length in the left-right direction. A pair of the columns 3a, 3a, 3b, 3b are erected at the lower part of the column, and carts 4a, 4a,
b and 4b are provided so as to be parallel to each other in the front-rear direction. Then, the distance between the columns 3b, 3b of the rear unit 1b is made wider than the distance between the left and right columns 3a, 3a of the front unit 1a, and the front deck 2a can sink under the deck 2b. It is like that.

Reference numerals 6a and 6b denote folding chairs according to the present invention which are installed on the decks 2a and 2b of the grandstands 1a and 1b. 7 is a frame serving as a base of the chair, 8
Is a seat rotatably supported between the left and right frames 7,7,
Reference numeral 9 denotes a backrest that stands obliquely rearward behind the seat 8 from the rear of the frame, and reference numeral 10 denotes an armrest that is rotatably supported on the upper ends of the left and right frames 7.

The chairs 6a and 6b in this embodiment are connected chairs provided with a plurality of chairs adjacent to each other. The grooves 12 are fitted, the plurality of frames 7 are arranged at intervals of the unit chairs, and the fixing brackets 13 attached to the lower ends of the respective frames from below are tightened by bolts 14 so that the plurality of unit chairs are arranged side by side. It is composed.

The connecting rods 11 are supported by columns 15 arranged at intervals, and the columns 15 are provided on the rear end upper surface of each deck.
7 and supported. The base 16 has a motor (not shown) serving as a drive source therein so that the rotation shaft can be freely rotated in forward and reverse directions via a speed reduction gear. It penetrates the inside through a slit provided, and the lower end is fixedly attached to the rotating shaft 17.

The frame 7 is formed by die-casting a metal material so as to integrally extend a substantially triangular arm 7a from the upper end of a vertically elongated main body portion. The portion has a rib-like edge 7b standing up to surround the respective peripheral edges of the left and right surfaces to form a storage space for components described later. Further, a support shaft 18 for supporting the seat 8 is provided protruding near the upper edges of both surfaces of the main body portion having the plate shape.

The seat 8 is provided with mounting lugs 19 which also serve as reinforcements on both left and right sides, and a cylindrical bearing 20 provided on the outer surface of the lugs is slidably fitted on the support shaft 18 of the frame 7. A pivot spring 21 for lifting up the seat 8 is wound on the peripheral surface of the bearing 20 here, and one end of the spring 21 is wound around the outer surface of the lug 19. The other end is hung on a protruding locking shaft 22, and the other end is hung on a winding plate 23, which is also rotatably mounted on the bearing 20, and is contracted between them. I'm trying to get it.

In the drawing, reference numeral 24 denotes a cover which surrounds a helical spring 21 wound around a cylindrical bearing 20 fitted on the support shaft 18. A large-diameter through-hole 25 is fitted on the bearing 20 to form a small-diameter through-hole. A wall 28 provided along the periphery of the lug 19 through a pin-shaped stopper 27 standing upright on the lug 19 through the hole 26.
Frame 7 surrounding the winding spring 21 wound around the bearing 20
Is confined in the storage space provided on the side surface.

In the figure, 29 is an interlocking rod, 30 is a first link member, and 31 is a second link member. The link bar 29 and the two link members 30, 31 are connected to the chairs 6a, 6b.
The pulling link means for rotating the hoisting plate 23 on the peripheral surface of the bearing 20 and tightening and compressing the winding spring 21 which locks one end of the hoisting plate 23 when it is turned forward.

The interlocking rod 29 is mounted with its lower end pivotally mounted on a shaft 32 horizontally arranged in parallel behind the rotary shaft 17 horizontally arranged on the base 16 and rises up substantially parallel to the support column 15 supporting the connecting rod 11. The upper end portion is provided with a connecting rod 11.
Along the lower edge of the backrest 9 of each of the chairs, the chair is attached to an interlocking shaft 33 which extends horizontally along the lower edge of the backrest 9 so as to extend between these two shafts 32, 33 which are positioned vertically.

The interlocking shaft 33 is interlocking means for simultaneously operating a plurality of chairs connected by the connecting rod 11, and the first link member 30 constituting the towing link means has a transparent member formed at one end. The hole 34 is connected to the link shaft 33
Through the interlocking shaft 33 and the interlocking rod 2
Connect to 9.

When the first link member 30 is assembled to the frame 7, the length of the first link member 30 is bent in a crank shape so as not to abut on the edge 7b. A small-diameter shaft hole 35 is formed at the opposite end where the through-hole 34 is provided, and the small-diameter shaft hole 35 faces a bearing portion 36 protruding from the side surface of the frame 7. The other end is pivotally attached to the other end together with the interlocking shaft 33 with the pin as a fulcrum.

The second link member 31 connects the first link member 30 and the hoisting plate 23, and has a through hole formed at one end thereof in the middle of a length close to the shaft end of the first link member 31. 37 and freely connected to a pin 37 via a pin (not shown),
The other end faces the freely rotatable end of the hoisting plate 23 and is connected by passing a pin (not shown) through through holes 38 and 39 formed at both ends, whereby the interlocking rod 29 and the hoisting plate 23 are connected to each other. They are connected via link members.

The interlocking rod 29 becomes a part of the traction link means as apparent from the above description, and
In this embodiment, the backrest 9 is also supported by the intermediary of the interlocking shaft 33. As shown in FIG. 3, the chair is in a standing position and can be seated. , It stands substantially vertically and supports the backrest 9 at a predetermined height position.

The backrest 9 is provided with mounting lugs 40 made of a metal plate on both side edges, and is connected to the lower end protruding from the lower edge of the backrest by pivotally connecting the interlocking shaft 33 to the upper end. The rear end of the armrest 10, which is rotatably mounted on the upper end of the arm 7 a of the frame 7 via a shaft 41, is connected via a shaft 42.

When the chair is in the standing posture,
The lower end edge is supported by the interlocking rod 29 and the first link member 30 so as to be located substantially behind the support shaft 18 for supporting the seat 8, and the armrest 10 connected to the backrest 9 is a frame 7.
And is supported in a substantially horizontal state so that the back and arms of the seated person can be supported when the seat 8 is seated with the seat 8 turned forward.

When the chair is in the upright state, the first link member 30 connected to the interlocking shaft 33 takes a posture in which the other end protrudes forward, and the first link member 30 connected to the interlocking shaft 33 in the middle of the length of this member. The link member 31 is in a vertically upright posture, the upper end of which is connected to the free end of the hoisting plate 23, and the free end of the hoisting plate 23 is held in a rearward horizontal position.

In the drawing, reference numeral 43 denotes a cushioning material which is fitted to the abutting portions 44a and 44b which regulate the rotation range of the seat 8 and receives the stopper 27 which collides with the rotation of the seat.
The abutting portions 44a and 44b are integrally provided when the frame 7 is formed. In this embodiment, the abutting portions 44a and 44b receive the stopper 27 inside the upper portion of the front edge of the edge 7b provided on the main body portion when the seat 8 jumps up. An abutting portion 44b is provided inside the rear portion of the upper edge portion to receive the stopper 27 when seated.
Is provided.

Each of the abutting portions 44a and 44b is provided with a thick portion on the inner side of the edge 7b as shown in FIG. Of course, the abutment portions 44a and 44b receive the stopper 27 of the seat 8 that pivots on the support shaft 18 so as to be located at an equal distance to the support shaft 18 and to rotate the seat from a substantially vertical position. Since they are placed between the horizontal positions, they are arranged at intervals of about 90 degrees around the support shaft 18.

The abutting portions 44a, 44b are provided with dovetail-shaped mounting grooves 45 in the thick portions, into which the cushioning material 43 is fitted and mounted. The mounting groove 45 has a groove length in the thickness direction of the frame 7 so that the buffer material 43 can be inserted and fitted from one end of the groove.

The cushioning member 43 is made of a material having elasticity such as rubber or soft synthetic resin and is formed in a round bar shape. In this case, the cushioning member 43 is formed into a cylindrical body adapted to the circumference drawn along the inner wall surface of the mounting groove 45. Formed and mated by pushing in the length of the groove from the opening at one end of the groove as described above.
In this case, a method is adopted in which the cushioning material 43 is slid from the end of the groove 45 for mounting, but this does not prevent the cushioning material from being forcibly pushed in while being compressed from the opening of the mounting groove. .

In this embodiment, the mounting groove 45 is used.
The abutting portions 44a and 44b are formed on the opposite surface of the frame 7 so as to be aligned and symmetrical, and the centers of the mounting grooves 45 on both sides are aligned with one another, and the frame 7 separating the two is provided. A through hole (not shown) having a diameter slightly smaller than that of the cushioning material 43 is formed in the plate portion of the above, and the cushioning material 43 formed so as to match the total length of the two grooves is inserted from one of the mounting grooves, and passed through the through hole. It is inserted into the other mounting groove, and simultaneously the cushioning material 4
3. The workability is enhanced by adopting the method of mounting 3.

The structure in which one cushioning material 43 is inserted into both of the left and right mounting grooves 45, 45 is capable of performing a single operation, and penetrates the middle of the length in a slightly impossible state. By simply passing through the hole, it can be held in a fixed position without taking a special fixing method, and it can be prevented from falling out of the groove.

In this case, if a more secure mounting is required, a space corresponding to the thickness of the frame 7 is provided at a substantially intermediate position of the buffer material 43 formed according to the length of the two mounting grooves 45, 45. , Two protrusions are raised from the peripheral surface, and one of the protrusions is forcibly passed through the through hole (not shown) at the time of mounting, so that the plate portion of the frame is sandwiched between the two protrusions to prevent the protrusion from coming off. I just need.

According to the method of forming the projections for retaining on the peripheral surface of the cushioning material 43, the through holes are formed in the cushioning material 4.
By making the diameter of the hole 3 easy to penetrate and making the protrusion height of the protrusion larger than the hole diameter and sandwiching it from both sides by passing through one of the protrusions, the mounting state can be easily made without dare to form a through hole with a small hole diameter. Can be secured.

Needless to say, these methods are left to the choice of the practitioner, including the selection of the shape of the projection, and are not limited to one. In addition, a combination method of interposing an adhesive between the mounting groove 45 and the cushioning material 43 may be adopted in these methods. However, if firmly fixed with a large amount of adhesive, free deformation described later is hindered, and in this case, selection is required.

FIG. 9 shows the abutment sections 44a, 44 according to the above configuration.
3B illustrates the relationship between the stopper 27 and the abutting portion 44b of the upper edge that receives the stopper 27 when the seat 8 is tilted horizontally. As shown in FIG. 7A, the cushioning material 43 until it receives the stopper 27 fits in the mounting groove 45 with its cross section being a perfectly circular shape, and is normally prevented from falling out by the narrowed opening. You.

FIG. 9B shows a state in which the seat 8 is strongly tilted, and the stopper 27 is strongly abutted against the cushioning material 43 and is slightly crushed. This deformation absorbs the rotational impact of the seat and also prevents the generation of noise.
At the same time, the cushioning material 43 that has been compressed and deformed enters the groove 45 and escapes into the space of the two corners 45a, 45a of the expanded bottom.

FIG. 9 (C) shows a state in which the weight of the occupant acts on the seat 8 which has been tilted forward and has a horizontal posture. By the pressing of the stopper 27, the cushioning material 43 is compressed and deformed into the dovetail-shaped mounting groove 45 and completely enters. The pin-shaped stopper 27 directly abuts against the abutting portion 44b of the frame 7, and Will be accepted.

At this time, the cushioning material 43 is compressed by the stopper 27 to reduce the cross-sectional area. However, the cushioning material 43 escapes into the space of the corner 45a by deforming, and the abutting portion 44b of the stopper 27 while maintaining the elastic repulsive force. Would allow direct aggression. The cushioning material 43 is provided in the groove 4
5 does not undergo any further compressive deformation, and the weight of the occupant is directly received by the abutment portion 44b and released from unnecessary load.

As described above, when the seat 8 is tilted forward, the stopper 27 is first abutted against the cushioning material 43 to prevent the generation of noise, etc., while the next time the seat is seated and the weight of the seated person is received. The movement of the stopper 27 is stopped here because the buffer material 43 is pushed into the groove and the stopper 27 is brought into direct contact with the groove. Accordingly, when the seat 8 is seated, the seat 8 is horizontally supported at a fixed position by the abutting portion 44b of the frame 7, and as a result, the seats 8 of the chairs arranged side by side have their front edges fixed in the seated state. Height, and will have a beautiful appearance.

On the other hand, the abutment portion 44a provided on the front edge of the frame 7 is configured similarly to the abutment portion 44b on the upper edge. This abutment portion 44a only receives the stopper 27 when the seat 8 is jumped up by the winding spring 21. At this time, the weight of the occupant is not applied.
3B, the cushioning material 43 does not deform and enter the inside of the mounting groove 45.

In the embodiment shown in the drawings, as described above, the dovetail-shaped mounting groove 45 is formed in the abutment portions 44a and 44b for fitting the cushioning material 43. Since the material 43 does not come off due to the narrowing of the opening in the normal state, the trouble of fixing with a screw or an adhesive is omitted, and since the cushioning material 43 can be freely deformed inside the groove, pulling caused when fixing with a screw etc. In addition, it can be used without difficulty for a long time without tearing.

As described above, the dovetail-shaped opening is narrow at the abutting portion and a wide groove is optimal at the bottom.
The opening may be narrowed by providing a ridge in the opening with a groove in the shape of a letter. Further, when the cushioning material 43 fitted in these grooves is fitted in the grooves, the directionality is not specified,
A columnar shape is suitable from the viewpoint of good resilience to crushing and a constant arc surface facing the stopper 27, but other cross-sectional shapes are not unsuitable.

However, the cushioning member 43 is provided with the abutting portions 44a, 44
Before the stopper 27 directly abuts against the b, the stopper 27 must be mounted with a part thereof protruding outside the opening of the mounting groove 45 in order to exhibit a buffering effect. Therefore, it goes without saying that selection of the width of the opening of the groove and the cross-sectional shape of the cushioning material 43 is required.

In the above-described embodiment, tapered inclined surfaces 46 are formed at the abutting portions 44a and 44b toward both openings of the mounting groove 45 in which the cushioning material 43 is mounted.
As shown in FIG. 7C, the stopper 27 is for securely receiving the stopper 27 when seated, and effectively acts to stabilize the seat 8 when seated.

The cushioning device for a chair according to the present invention is constructed as described above. Next, the actual use of the chair will be described through the operation of moving the seat and folding the chair. First, the seat body 1 is, as described above, the front and rear decks 2a and 2a.
b is extended and contracted by moving b. After use, all the decks are pulled out and extended in a stepped manner. After that, the motor (not shown) inside the base 16 provided in each deck is driven to rotate the rotating shaft 17 in FIG. Then, the column 15 is raised and the chair connected by the connecting rod 11 is raised.

FIG. 1 shows a state in which the chair on the front deck 2a is erected and the seat 8 is tilted forward so that the seat can be seated, and the chair on the rear deck 2b is further pulled out from under the deck connected to the rear thereof. Shows what was left forward.

When the column 15 is raised by the rotation of the rotating shaft 17 and the chair stands, the interlocking rod 29 is moved along with the shaft 32.
From the front and rear of the bearing positions of the rotating shaft 17 and the shaft 32, the upper end of the rotating shaft 17 and the shaft 32 are moved up parallel to the rear edge of the frame 7, and the interlocking shaft 33 is pushed up to connect the back of each chair. The backrest 9 will be pushed up.

As the backrest 9 is pushed up, the rear end of the armrest 10 which is pivotally mounted on the middle of the height is raised, and this is rotated horizontally, and the pivot of the armrest 10 with the frame 7 is increased. Due to the length between the landing point 41 and the pivot point 42 at the rear end, the vehicle is set in a state where it can be seated while maintaining a slightly tilted posture.

After completion of the operation of extending the seats, the chairs on the respective decks are sequentially raised by the driving of the rotating shaft 17 and become ready for use. The seat 8 of each chair is always maintained in a state in which the front edge is jumped up by the repulsive force of the winding spring 21. In use, the seat 8 is pushed down by hand and tilted horizontally to be seated.

When the seat 8 is tilted forward, the bearing 20 rotates about the support shaft 18 and the lug 19 rotates to push down one end of the winding spring 21 which is hooked on the pin 22, thereby increasing the compression of the spring. Meanwhile, the seat 8 changes its posture to the front, so that the restoring force at the time of leaving the seat is accumulated.

The other end of the winding spring 21 that acts to raise the seat 8 is hooked on a winding plate 23, and the winding plate 23 is connected to the second link member 31 and the first link member 3.
0, and since it is stopped at the fixed position by the connection of the interlocking rod 29, the winding and drawing can be reliably performed with the seat 8 being moved forward.

As described above, the seat 8 which is brought forward against the winding spring 21 is provided with the stopper 27 as described above.
The stopper 27 is stopped by abutting against the cushioning member 43 of FIG. 4b and is kept horizontal, while being crushed when receiving the weight of the occupant and deforming into the inside of the mounting groove 45 and escaping into the corner 45a thereof. Is received directly by the abutment portion 44b and is stably supported.

On the other hand, the folding of the chair forward is performed prior to storing the deck of the seat. The folding of the chair is performed by rotating the rotating shaft 17 in the reverse direction. In FIG. 3, when the rotation shaft 17 is rotated in the counterclockwise direction, the column 15 is tilted forward, and all the chairs 6a and 6b are directed toward the upper surface of the deck as the connecting rod 11 arranged horizontally moves forward. Will fall forward.

FIG. 8 shows a state in which the chair 6a (6b) is lowered on the deck from the state in which the seat 8 shown in FIGS. 3 and 4 is jumped up. It shows the figure on the way. As shown in the figure, when the chair, that is, the frame 7 starts to lean forward, the interlocking rod 29 falls forward around the lower end where it is axially attached to the shaft 32. As described above, since the fulcrum is located behind the rotation shaft 17 of the column 15 as described above, the upper end portion is retracted as it falls down by the difference between the positions shifted forward and backward, so that the interlocking link is connected. The shaft 33 is located below the frame 7,
That is, it is shifted backward.

As the interlocking shaft 33 retreats, the first link member 30 having one end axially mounted on the bearing portion 36 rotates clockwise in the drawing, and this rotation causes the second link member 31 to rotate.
Is pulled down, and the winding plate 23 is also rotated clockwise about the support shaft 18 to narrow down the winding spring 21 that locks one end to a through hole 47 provided at a free end of the winding plate 23.

That is, when the support column 15 and the frame 7 are moved forward by the rotation of the rotary shaft 17, the interlocking rod 29 attached to the shaft 32 is moved forward, and at the same time, the interlocking shaft 33 is pulled down due to the displacement of both fulcrums. The first link member 3
0 rotates, the second link member 31 is pulled down, the winding plate 23 rotates, and the winding spring 21 is squeezed to increase the repulsive force. As a result, the lifting force of the seat 8 is automatically increased. become.

FIG. 8 shows a state in which the frame 7 of the chair has fallen on the upper surface of the deck 2a, and the first link member 30 and the second link member 31 are substantially straight as the interlocking rod 29 falls horizontally. The winding spring 21 is compressed by rotating the winding plate 23 so that the free end of the winding plate 23 is pulled down. At this time, the interlocking shaft 33 is drawn into the notch 48 provided at the lower end of the rear edge of the frame 7, and is aligned with the interlocking rod 29 inside the rear edge of the frame 7.

At the same time as the compression of the winding spring, the interlocking shaft 33
As the chair is lowered, the backrest 9 of each chair is lowered, and at the same time, the armrest 9 rotates about the shaft 41 and is aligned with the seat 8 which has been flipped up, and the chair is folded flat on the deck upper surface. You will be stoked. After the folding of all the chairs is completed in this way, the shrinking and retracting operation of the grandstand is performed.

The first link member 30 which constitutes the towing link member axially connects the second link member 31 in the middle of the length near the pivot end, so that the hoisting plate 23 acts as a lever. Since the first link member 30 supports the lower end of the backrest 9 via the interlocking shaft 33, the first link member 30 pivots on the interlocking rod 29 as a fulcrum and pulls down toward the frame. This will help the attracting backrest 9 to fold flat.

Although the present invention has been described in detail with reference to the embodiment, the groove 45 for mounting the cushioning material 43 can be integrally formed when the frame 7 is formed, and the mounting groove 45 has a length in the thickness direction of the frame. There is an advantage that the groove can be easily provided at the time of molding the frame. In addition, while the mounting groove 45 can freely select an internal cross-sectional shape when the frame 7 is formed, an abutting portion adapted to a cushioning material having a size and a shape required from a freely selectable length can be easily formed. There are advantages that can be provided.

[0069]

As is apparent from the above description, the cushioning device for a chair according to the present invention has the abutment portions 44a and 44b when the frame 7 of the chair is formed, and the mounting groove 45 is formed integrally therewith. Can accommodate the mounting of the cushioning material 43, while the cushioning material 43 can be easily mounted by simply pushing it into the groove 45, and thus is troublesome by bolts or adhesives. There is an advantage that the mounting operation is not required and the buffer member 43 can be easily replaced.

Unlike the conventional mounting method using bolts or the like, a part of the cushioning member 43 is not fixedly attached, so that when the stopper 27 is deformed due to collision, a part of the cushioning member is partially distorted. Without being concentrated
Therefore, there is an advantage that the durability is excellent without being damaged by excessive force.

Further, according to the present invention, the cushioning member 43 is mounted in the mounting groove 45 of the abutting portions 44a, 44b so that a part of the buffer material 43 protrudes out of the opening, and the abutting portions 44a, 44b are impacted. The stopper 27 is first received by the protruding portion of the cushioning material to absorb the impact, thereby suppressing the generation of noise and the like.
At the time of sitting, the protrusion of the cushioning material 43 is pushed into the inside of the groove 45 by the stopper 27 by the weight of the occupant, and the space between the groove 45 and the cushioning material 43, that is, the corner 4
The entire cushioning material is easily retracted by using the 5a, and the stopper 27 is brought into direct contact with the abutting portions 44a, 44b. Therefore, the sinking of the seat 8 is reliably prevented, and a stable seating feeling is provided. There is an advantage that can be secured.

In addition to the effects described above, according to the present invention, when the weight of the occupant is received by the seat 8, the stopper 27 is received by the abutment portion 44b and the cushioning material 43 is not further compressed and deformed, so that the stopper 27 receives an unnecessary load. Therefore, it can be used for a long time with less fatigue.

[Brief description of the drawings]

FIG. 1 is a view for explaining a state in which a chair on a front deck is erected in a usable state while a deck of a bleacher is extended, and a chair on a rear deck is folded forward. Right side view.

FIG. 2 is a front view showing a chair standing upright on a deck which is horizontally lowered and which is lifted up.

FIG. 3 is an enlarged right side view of a state in which the chair is upright.

FIG. 4 is an enlarged right side view of a main part in a state where a seat is raised and raised.

FIG. 5 is an enlarged right side view of a main part in a state where the seat is tilted horizontally and seating is possible.

FIG. 6 is an enlarged front view showing a partial cross section of a main part in a state where the seat is tilted horizontally and a seat can be seated.

FIG. 7 is an enlarged exploded perspective view of a main part.

FIG. 8 is a right side view of a main part in a state where the chair is moved forward.

FIG. 9 is an enlarged side view illustrating an abutting state of a stopper provided on a seat and an abutting portion provided on a chair frame;
(A) shows the state where the cushioning material and the stopper collided, (B)
The state in which the cushioning material is deformed by the pressing of the stopper and retreats into the groove is further shown. (C) The weight of the occupant in the seat is increased, and the cushioning material is completely pushed into the groove by the stopper and the stopper is used. Indicates a state of directly abutting against the buffer.

[Explanation of symbols]

6a, 6b Chair 7 Frame 8 Seat 9 Backrest 10 Armrest 18 Support shaft 21 for supporting a seat provided on the frame 21 Winding spring 27 Stopper 43 Buffer material 44a, 44b Abutment part 45 Mounting groove 45a Air gap between cushion material Corner of the mounting groove forming the groove 46 sloped surface facing the opening of the mounting groove

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-21971 (JP, A) JP-A-7-171029 (JP, A) JP-A-9-56522 (JP, A) 131659 (JP, U) Japanese Utility Model 63-163661 (JP, U) Japanese Utility Model 62-166760 (JP, U) Japanese Utility Model Application 62-33358 (JP, U) (58) Field surveyed (Int. ⁷ , DB name) A47C 7/60 A47C 1/121

Claims (4)

(57) [Claims] 1. A seat is rotatably supported on a chair frame via a support shaft, and when the seat is tilted horizontally from a vertical position, a stopper provided on the seat abuts on an abutting portion provided on the chair frame. In the flip-up chair configured to be held in a horizontal posture, the abutting portion has a bottomed opening that opens toward the stopper that pivots around the support shaft and that is narrower than the internal space. A groove is formed integrally, and an elastic buffer is fitted and held inside the mounting groove, and a part of the elastic buffer is supported so as to protrude outward through the opening,
When the seat is tilted horizontally from a vertical position, the stopper is brought into contact with the protruding portion to absorb the impact,
In addition, at the time of seating, the protruding portion is compressed and retracted by the stopper by the weight of the occupant and pushed and housed in a state of being compressed inside the mounting groove, and the stopper is directly abutted against the abutting portion to receive and hold in a horizontal position. On the other hand, at the time of removal from the seat, the compressed elastic cushioning material is restored along with the release of the stopper, and the protruding portion from the inside of the mounting groove is protruded again through the opening to prepare for the abutment. A flip-up chair shock absorber characterized by becoming. 2. The cushioning device for a flip-up chair according to claim 1, wherein the mounting groove has a dovetail-shaped cross section whose bottom is wide toward the opening. 3. The cushioning device for a flip-up chair according to claim 1, wherein the elastic cushioning material is a rubber or an elastic soft resin. 4. The flip-up chair according to claim 1, wherein the elastic cushioning material is formed in a cylindrical shape in which the elastic cushioning material is accommodated in the mounting groove and a part of the peripheral surface protrudes from the opening of the mounting groove. Shock absorber.