JP3120862U - Chair tilting device - Google Patents

Abstract

To provide a chair tilting device that can reduce the number of parts and can reduce the cost and simplify the manufacturing work.
In a chair tilting device, when a person is not sitting on a seat portion, a top plate portion of an upper member is subjected to an upward turning force by a rubber elastic member in a compressed state, and a stopper pin is The shaft portion 51 is at the upper limit position pressed by the upper ends of the vertically long holes 22a and 23a. Further, when a person sits on the seat portion 102, the rubber elastic member 6 in a compressed state is further compressed by the weight of the person, and the upper member 3 rotates downward with the rotation shaft pin 4 as a rotation shaft, and a stopper pin. The shaft portion 51 of the fifth member moves downward from the upper limit position in each of the vertically elongated holes 22a and 23a, and the upper member 3 tilts to change the angles of the seat portion 102 and the backrest portion 103.
[Selection] Figure 3

Description

  The present invention relates to a chair tilting device for automatically changing the angles of a seat part and a backrest part according to weight when a person sits on a chair.

  2. Description of the Related Art Conventionally, a chair tilting device, that is, a chair in which a chair tilting device for automatically changing an angle of a backrest portion or the like using a person's weight is incorporated in a lower portion of a seat portion is known.

  A conventional chair tilting device 200 is shown in FIGS.

  As shown in FIGS. 9 and 10, the chair tilting device 200 includes a case main body 201 connected to a leg portion (not shown) of the chair, a case upper plate 202 welded to the case main body 201, and a case main body 201. And an inner pipe 203 welded to each other. A left outer pipe 204 and a right outer pipe 205 are fitted on the inner pipe 203. A U-shaped stopper 206 is welded to the right end of the left outer pipe 204 and the left end of the right outer pipe 205. The U-shaped stopper 206 is disposed so as to accommodate the case main body 201, and a stopper reinforcing plate 207 is welded to the side portion. The left outer pipe 204 is welded with a left seat receiving angle 208 that is connected to a seat (not shown) and can be tilted backward when a person sits on the seat. The right outer pipe 205 is welded with a right seat receiving angle 209 that is connected to the seat and can be tilted backward when a person sits on the seat. A torsion piece 210 having a square hole 210 a is welded inside the right end portion of the inner pipe 203. A torsion bar 211 having a square cross section is inserted into the inner pipe 203, and the right end of the torsion bar 211 is fitted into a square hole 210a of the torsion piece 210 and welded. Inside the left end portion of the inner pipe 203, a torsion collar 212 having a round hole 212a through which the torsion bar 211 is rotatably inserted is welded. An adjustment arm 213 is welded to the left end portion of the torsion bar 211. The tip of the adjustment arm 213 is in contact with the lower surface of the pressure receiving portion 208a of the left seat receiving angle 208.

In the chair tilting device 200, when a person sits on the seat, the pressure receiving part 208a of the left seat receiving angle 208 pushes down the adjustment arm 213 against the elastic restoring force of the torsion bar 211, depending on the weight of the person. The left seat receiving angle 208 tilts backward. At the same time, the right seat receiving angle 209 tilts backward depending on the weight of the person. Then, as the left seat receiving angle 208 and right seat receiving angle 209 are tilted backward, the U-shaped stopper 206 rotates via the left outer pipe 204 and the right outer pipe 205, and the U-shaped stopper 206 hits the case upper plate 202. When tilted, the backward tilt stops. Prior to the present application, prior art was investigated, and Patent Documents 1 and 2 were found.
Japanese Utility Model Publication No. 7-5542 JP 2003-24167 A

  However, according to the conventional chair tilting device, there are problems that the number of parts is large and the cost is high, and the production work is complicated.

  The main object of the present invention is to provide a chair tilting device that solves the problems of the prior art as described above, reduces the number of parts, reduces costs, and simplifies manufacturing work. And

  A chair tilting device according to the present invention is provided between a leg portion and a seat portion of a chair, and changes the angle of the seat portion and the backrest portion in response to the weight of a seated person. The left side wall and the right side wall extending vertically upward from the left end and the right end of the floor plate, and the left side wall and the right side so as to pass through the front side of the left side wall and the front side of the right side wall. A base member having a pipe portion provided horizontally between the right side wall portion, a top plate portion, and a left side wall portion and a right side wall portion extending vertically downward from the left end and the right end of the top plate portion. Fits into the upper member, a shaft portion that is inserted through the pipe portion and slidably contacted with the inner peripheral surface of the pipe portion, and a polygonal hole provided in either the left side wall portion or the right side wall portion of the upper member. A rotating shaft pin fixed to the upper member, and A stopper pin provided horizontally between the front-rear direction intermediate portion of each left side wall portion of each of the support member and the upper member and the front-rear direction intermediate portion of each right side wall portion, the left side wall portion and the right side wall of the base member A shaft portion inserted into a vertically elongated slot provided in each of the portions and a round hole provided in one of the left and right side walls of the upper member, and a polygon provided in the other side wall portion of the upper member A stopper pin fixed to the upper member, and a fixed arrangement in a compressed state between a rear portion of the floor plate portion of the base member and a rear portion of the top plate portion of the upper member. A rubber elastic member, and when a person is not sitting on the seat portion, the top plate portion of the upper member receives a rotational force upward by the rubber elastic member in the compressed state, and the shaft of the stopper pin The upper and lower parts When the person sits on the seat, the rubber elastic member in the compressed state is further compressed by the weight of the person, and the upper member pushes the rotating shaft pin. The shaft portion of the stopper pin moves downward from the upper limit position in each of the vertically elongated holes, and the upper member tilts to cause the seat portion and the backrest portion to rotate downward as a rotation shaft. The angle is changed.

  According to the chair tilting apparatus of the present invention, the number of parts is small, the cost can be reduced, and the production work can be simplified. Further, since the shaft portion of the rotary shaft pin is inserted so as to be slidable on the inner peripheral surface of the pipe portion, when the rotary shaft pin rotates, the shaft portion slides in a state of contact with the inner peripheral surface of the pipe portion. Rotates while touching. For this reason, local wear of the rotating shaft pin can be prevented, and a chair tilting device having excellent durability can be provided. In addition, since the rubber elastic member is disposed in a compressed state between the base member and the upper member, it is not necessary to provide any special configuration for fixing the rubber elastic member. Further, since the rotation shaft pin and the stopper pin can be fixed to the upper member by utilizing the fitting between the polygonal portion and the polygonal hole, the configuration for the fixation can be simplified. Furthermore, the chair tilting device of the present invention is composed of parts that are separated and independent from each other, such as a base member, an upper member, a rotating shaft pin, a stopper pin, and a rubber elastic member, and can be assembled without using an adhesive. It becomes easy and can protect resources.

  In addition, the rear upper surface of the left side wall portion and the rear upper surface of the right side wall portion of the base member are configured by inclined surfaces that descend toward the rear, and when a person sits on the seat portion, the ceiling of the upper member If the rear lower surface of the plate portion is in contact with the upper surface of each rear portion so that the tilting of the upper member stops, for example, the upper member can be tilted by receiving the shaft portion of the stopper pin at the lower end of the vertical hole. When stopping, the load on the shaft portion of the stopper pin is extremely large and lacks durability, but such a problem can be solved.

  In addition, when the concave portion is provided on the lower surface of the rubber elastic member and the convex portion that fits into the concave portion is provided on the floor plate portion of the base member, the position of the rubber elastic member is more reliably fixed.

  Further, when a plurality of attachment holes are provided in the top plate portion of the upper member, and the attachment holes corresponding to the attachment positions of the seat portion of the chair to which the chair tilting device is attached are selected and used, a plurality of types of chairs are used. Can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view of a chair incorporating a chair tilting device according to an embodiment of the present invention when there is no load (when a person is not sitting), and FIG. 2 is when the chair is loaded (when a person is sitting) 3 is a perspective view of the chair tilting device, FIG. 4 is a perspective view of the base member, FIG. 5 is a perspective view of the upper member, and FIG. 7 is a perspective view of the stopper pin, FIG. 7 is a side sectional view of the chair tilting device when no load is applied, and FIG. 8 is a side sectional view of the chair tilting device when loaded.

  1 and 2, a chair 100 includes a leg portion 101, a seat portion 102, and a backrest portion 103, and the leg portion 101 is fixed to a floor surface 104 with a fixing bracket 105. The chair tilting device 1 is provided between the two.

  As shown in FIG. 3, the chair tilting device 1 includes a base member 2, an upper member 3, a rotating shaft pin 4, a stopper pin 5, and a rubber elastic member 6.

  As shown in FIG. 4, the base member 2 is made of steel, and as shown in FIG. 4, the left side wall part 22 and the right side wall part 23 that extend vertically upward from the left end and the right end of the floor board part 21, and the left side wall part. And a pipe part 24 provided horizontally between the left side wall part 22 and the right side wall part 23 so as to penetrate the front part of 22 and the front part of the right side wall part 23.

  On the rear upper surface of the floor plate portion 21, a convex portion 21 a that fits into the concave portion 61 provided in the rubber elastic member 6 is provided. The convex portion 21 a of the floor plate portion 21 is fitted into the concave portion 61 of the rubber elastic member 6, thereby securing the position of the rubber elastic member 6 on the upper surface of the floor plate portion 21.

  The floor plate portion 21 is provided with a plurality of leg portion attachment holes 21b, and nuts 21c are welded to portions corresponding to the leg portion attachment holes 21b on the upper surface of the floor plate portion 21. Bolts (not shown) on the leg 101 side are screwed into these nuts 21c, and the base member 2 is fixed to the leg 101.

  In the front-rear direction intermediate part of the left side wall part 22 and the front-rear direction intermediate part of the right side wall part 23, vertical long holes 22a, 23a are respectively provided.

  The front upper surface 22b of the left side wall portion 22 and the front upper surface 23b of the right side wall portion 23 are configured by a horizontal plane, and the rear upper surfaces 22c, 23c following the front upper surfaces 22b, 23b are inclined surfaces that descend toward the rear. It is configured.

  The upper member 3 is made of steel, and has a top plate portion 31, and a left wall portion 32 and a right wall portion 33 that extend vertically downward from the left and right ends of the top plate portion 31, as shown in FIG. .

  The top plate portion 31 is configured horizontally in the front-rear direction.

  The top plate portion 31 is provided with a plurality of seat mounting holes 31a. A nut 31b is welded to a lower surface of the top plate portion 31 at a portion corresponding to some of the seat portion mounting holes 31a among the plurality of seat portion mounting holes 31a. Bolts (not shown) on the seat portion side are screwed into these nuts 31b, and the upper member is fixed to the seat portion 102. The selection of the seat mounting hole 31a to which the nut 31b is welded is predetermined according to the type of the chair 100.

  In the front part of the left side wall part 32, a round hole 32a into which a tip part 41a of a shaft part 41 of the rotating shaft pin 4 described later is inserted is provided. Further, a round hole 32b through which a distal end portion 51a of a shaft portion 51 of the stopper pin 5 described later is inserted is provided in the middle portion in the front-rear direction of the left side wall portion 32.

  A polygonal hole 33 a into which the polygonal portion 42 of the rotating shaft pin 4 is fitted is provided in the front portion of the right side wall portion 33. Further, a polygonal hole 33 b into which the polygonal part 52 of the stopper pin 5 is fitted is provided in the middle part in the front-rear direction of the right side wall part 33.

  As shown in FIG. 6, the rotating shaft pin 4 has a shaft portion 41, a polygonal portion 42, and a head portion 43.

  The shaft portion 41 has an outer diameter that is slightly smaller than the inner diameter of the pipe portion 24, and is inserted into the pipe portion 24 and can be slidably contacted with the inner peripheral surface of the pipe portion 24. The distal end portion 41 a of the shaft portion 41 is inserted into the round hole 32 a of the left side wall portion 32 of the upper member 3.

  In the case of this embodiment, the polygonal part 42 is comprised by the hexagonal board part, and has an outer diameter larger than the outer diameter of the axial part 41. FIG. The polygonal portion 42 is fitted into the polygonal hole 33 a of the right side wall portion 33 of the upper member 3.

  The head 43 is formed adjacent to the polygonal part 42 and has an outer diameter larger than the outer diameter of the polygonal part 42. The head 43 is disposed so as to contact the outer surface of the right wall 33 of the upper member 3.

  The rotary shaft pin 4 is fixed to the upper member 3 by fitting a push nut 44 into the tip portion 41a of the shaft portion 41 with the head portion 43 pressed against the outer surface of the right side wall portion 33 of the upper member 3.

  As shown in FIG. 6, the stopper pin 5 has a shaft portion 51, a polygonal portion 52, and a head portion 53.

  The shaft portion 51 has an outer diameter slightly smaller than the lateral width of the vertical elongated holes 22a and 23a of the base member 2, and the vertical elongated slot 23a of the right side wall portion 23 of the base member 2 and the base member. 2 of the left side wall portion 22 in the vertical direction 22 a and the round hole 32 b of the left side wall portion 32 of the upper member 3 are inserted.

  In the present embodiment, the polygonal portion 52 is formed of a hexagonal plate portion, and has an outer diameter dimension larger than the outer diameter of the shaft portion 51. The polygonal part 52 is fitted into the polygonal hole 33 b of the right side wall part 33 of the upper member 3.

  The head 53 is formed adjacent to the polygon 52 and has an outer diameter larger than the outer diameter of the polygon 52. The head 53 is disposed so as to contact the outer surface of the right wall 33 of the upper member 3.

  The stopper pin 5 is fixed to the upper member 3 by fitting a push nut 54 into the distal end portion 51a of the shaft portion 51 in a state where the head portion 53 is pressed against the outer surface of the right side wall portion 33 of the upper member 3.

  The rubber elastic member 6 is made of a urethane rubber material and has a substantially quadrangular prism shape as shown in FIG. 4, and a concave portion 61 that fits with the convex portion 21 a of the floor plate portion 21 of the base member 2 is formed on the lower surface. Has been. A nut housing recess 62 for housing the nut 31b of the upper member 3 is formed on the upper surface. The rubber elastic member 6 is fixedly disposed in a compressed state between the rear portion of the floor plate portion 21 of the base member 2 and the rear portion of the top plate portion 31 of the upper member 3 in the state after assembly shown in FIG. 3.

  Assembly of the chair tilting device 1 is performed as follows, for example.

  First, the rubber elastic member 6 is placed on the floor plate portion 21 so that the concave portion 61 of the rubber elastic member 6 fits into the convex portion 21a of the floor plate portion 21 of the base member 2, the upper member 3 is covered on the base member 2, and the rotating shaft pin 4 The shaft portion 41 of the upper member 3 is sequentially inserted from the polygon hole 33a of the upper member 3 into the pipe portion 24 of the base member 2 and the round hole 32a of the upper member 3, and the polygon portion 42 of the rotary shaft pin 4 is inserted into the polygon hole 33a of the upper member 3. The push nut 44 is fitted into the tip portion 41a of the rotary shaft pin 4 in the fitted state. Accordingly, the upper member 3 is assembled to the base member 2 so as to be rotatable in the vertical direction with the rotation shaft pin 4 as the rotation axis.

  Next, the rubber elastic member 6 is compressed by pressing the upper member 3 downward (corresponding to the state indicated by a one-dot chain line in the rubber elastic member 6 shown by a solid line in FIG. 4). In the state where the polygonal holes 32 b and 33 b of the upper member 3 overlap the vertical holes 22 a and 23 a of the upper member 2, the shaft 51 of the stopper pin 5 extends from the polygonal hole 33 b of the upper member 3 to the vertical length of the base member 2. The tip of the stopper pin 5 is inserted into the hole 23a, the vertically elongated hole 22a, and the round hole 32b of the upper member 3 in order, and the polygonal portion 52 of the stopper pin 5 is fitted into the polygonal hole 33b of the upper member 3. The push nut 54 is fitted into the portion 51a. Thereby, the rotation of the upper member 3 in the vertical direction is restricted to a range in which the stopper pin 5 can move in the vertical direction in the vertical long holes 22a and 23a. By such work, the chair tilting device 1 as shown in FIG. 3 is manufactured.

  Next, operation | movement of the chair tilting apparatus 1 comprised as mentioned above is demonstrated, referring FIG.7 and FIG.8 collectively.

  When a person is not sitting on the seat portion 102, the top plate portion 31 of the upper member 3 receives upward turning force by the rubber elastic member 6 in a compressed state as shown in FIG. Reference numeral 51 denotes an upper limit position pressed by the upper ends of the vertical slots 22a and 23a. Therefore, the chair 100 is maintained in a state as shown in FIG.

  When a person sits on the seat portion 102, as shown in FIG. 8, the compressed rubber elastic member 6 is further compressed by the weight of the person (in the rubber elastic member 6 shown by a solid line in FIG. The upper member 3 rotates downward with the rotation shaft pin 4 as a rotation shaft, and the shaft portion 51 of the stopper pin 5 is located in each of the vertically elongated holes 22a and 23a. Move downward from the upper limit position. The angle of the seat portion 102 and the backrest portion 103 is changed by the downward rotation of the upper member 3. That is, the rear part of the seat part 102 tilts downward, and the backrest part 103 tilts backward. When the rear lower surface 31c of the top plate portion 31 of the upper member 3 comes into contact with the rear upper surface 22c of the left wall portion 22 and the rear upper surface 23c of the right wall portion 23, the seat portion 102 and the backrest portion 103 are provided. Is stopped and maintained at a constant tilt angle. Thereby, the chair 100 changes from the state shown in FIG. 1 to the state shown in FIG.

  As described above, the chair tilting device 1 according to the present embodiment is provided between the leg portion 101 and the seat portion 102 of the chair 100, and receives the weight of the person who is seated, and the angles of the seat portion 102 and the backrest portion 103. Is a chair tilting device that changes the floor plate 21, the left side wall 22 and the right side wall 23 extending vertically upward from the left and right ends of the floor plate 21, and the front and right side of the left side wall 22. A base member 2 having a pipe portion 24 horizontally provided between the left side wall portion 22 and the right side wall portion 23 so as to penetrate the front portion of the top portion 23, and the left end of the top plate portion 31 and the top plate portion 31. An upper member 3 having a left side wall part 32 and a right side wall part 33 extending vertically downward from the right end, a shaft part 41 inserted through the pipe part 24 and slidable into contact with the inner peripheral surface of the pipe part 24, and the upper part Installed on either the left wall 32 or the right wall 33 of the member 3 A rotation shaft pin 4 fixed to the upper member 3 and the left and right wall portions 22 and 32 of the base member 2 and the upper member 3. Is a stopper pin 5 provided horizontally between the right side wall portion 23 and the right side wall portion 23, 33 in the front-rear direction, and is provided in the vertical direction length provided on the left side wall portion 22 and the right side wall portion 23 of the base member 2, respectively. A shaft portion 51 inserted into the holes 22a and 23a and a round hole 32b provided in one of the left and right side wall portions 32 of the upper member 3, and a polygonal hole 33b provided in the other side wall portion 33 of the upper member 3. And a stopper pin 5 fixed to the upper member 3, and compressed between the rear portion of the floor plate portion 21 of the base member 2 and the rear portion of the top plate portion 31 of the upper member 3. A rubber elastic member 6 fixedly arranged in a state; When the person is not sitting on the seat portion 102, the top plate portion 31 of the upper member 3 receives upward turning force by the rubber elastic member 6 in a compressed state, and the shaft portion 51 of the stopper pin 5 is When the person sits on the seat 102, the rubber elastic member 6 in a compressed state is further compressed by the weight of the person, and the upper member 3 rotates. The shaft portion 4 of the stopper pin 5 is moved downward from the upper limit position in each of the vertically elongated holes 22a and 23a, and the upper member 3 is tilted to be seated. The angle of the part 102 and the backrest part 103 changes.

  According to the chair tilting device 1 of the present invention, the number of parts is small, the cost can be reduced, and the production work can be simplified. Further, since the shaft portion 41 of the rotating shaft pin 4 is slidably inserted into the inner peripheral surface of the pipe portion 24, when the rotating shaft pin 4 rotates, the shaft portion 41 becomes the inner peripheral surface of the pipe portion 24. It will turn while sliding in contact with the surface. For this reason, local abrasion of the rotating shaft pin 4 can be prevented, and a chair tilting device having excellent durability can be provided. In addition, since the rubber elastic member 6 is arranged in a compressed state between the base member 2 and the upper member 3, it is not necessary to provide any special configuration for fixing the rubber elastic member 6. In addition, since the rotary shaft pin 4 and the stopper pin 5 can be fixed to the upper member 3 by using the fitting between the polygonal portions 42 and 52 and the polygonal holes 33a and 33b, the structure for fixing can be simplified. Can be planned. Further, the chair tilting device 1 according to the present embodiment is composed of parts such as a base member 2, an upper member 3, a rotating shaft pin 4, a stopper pin 5, and a rubber elastic member 6 that are separated from each other and assembled without using an adhesive or the like. This makes it easy to recycle and protect resources.

  Further, the rear upper surface 22c of the left side wall portion 22 and the rear upper surface 23c of the right side wall portion 23 of the base member 2 are configured by inclined surfaces that descend toward the rear, and when a person sits on the seat portion 102, the upper member 3 Since the rear lower surface 31c of the top plate portion 31 is in contact with the rear upper surfaces 22c and 23c, the tilting of the upper member 3 is stopped. For example, the shaft portion 51 of the stopper pin 5 is formed at the lower ends of the vertically elongated holes 22a and 23a. When the tilting of the upper member 3 is stopped by receiving the load, the burden on the shaft portion 51 of the stopper pin 5 is extremely large and lacks durability, but such a problem can be solved.

  Moreover, since the recessed part 61 was provided in the lower surface of the rubber elastic member 6, and the convex part 21a fitted to the recessed part 61 was provided in the floor board part 21 of the base member 2, such a recessed part 61 and the convex part 21a are not provided. As a result, the position of the rubber elastic member 6 can be fixed more reliably.

  In addition, a plurality of attachment holes 31a are provided in the top plate portion 31 of the upper member 3, and the attachment holes 31a corresponding to the attachment locations of the seat portion 102 of the chair 100 to which the chair tilting device 1 is attached are selected and used. It is possible to provide a chair tilting device that can handle a plurality of types of chairs.

It is a side view at the time of no load (when a person is not sitting) of a chair incorporating a chair tilting device according to an embodiment of the present invention. It is a side view at the time of the load of the chair (when a person is sitting). It is a perspective view of a chair tilting device. It is a perspective view of a base member. It is a perspective view of an upper member. It is a perspective view of a rotating shaft pin and a stopper pin. It is side surface sectional drawing at the time of no load of a chair tilting apparatus. It is side surface sectional drawing at the time of load of a chair tilting apparatus. It is a plane fragmentary sectional view of the conventional chair tilting apparatus. It is side surface sectional drawing of the chair tilting apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chair tilting apparatus 2 Base member 21 Floor board part 21a Protrusion part 22 Left side wall part 22a Vertical elongate hole 22c Rear upper surface 23 Right side wall part 23a Vertical elongate hole 23c Rear upper surface 24 Pipe part 3 Upper member 31 Top plate part 31a Mounting hole 31c Rear lower surface 32 Left side wall portion 32b Round hole 33 Right side wall portion 33a Polygonal hole 33b Polygonal hole 4 Rotating shaft pin 41 Shaft portion 42 Polygonal portion 5 Stopper pin 51 Shaft portion 52 Polygonal portion 6 Rubber elastic member 61 Recessed portion 100 Chair 101 Leg portion 102 Seat 103 Backrest

Claims (8)

In the chair tilting device that is provided between the leg portion and the seat portion of the chair and changes the angle of the seat portion and the backrest portion in response to the weight of the person who sits,
The left side so as to pass through the floor plate part, the left side wall part and the right side wall part extending vertically upward from the left end and the right end of the floor board part, and the front part of the left side wall part and the front part of the right side wall part A base member having a pipe portion provided horizontally between the wall portion and the right side wall portion;
An upper member having a top plate portion and a left wall portion and a right wall portion extending vertically downward from the left end and the right end of the top plate portion;
A polygon inserted into the pipe part and fitted in a polygonal hole provided in either the left side wall part or the right side wall part of the upper member, and a shaft part that can be slidably contacted with the inner peripheral surface of the pipe part. A rotating shaft pin that is fixed to the upper member,
A stopper pin provided horizontally between a front-rear direction intermediate portion of each left side wall portion of each of the base member and the upper member and a front-rear direction intermediate portion of each right side wall portion, the left side wall portion and the right side of the base member A shaft portion that is inserted into a vertical slot provided in each wall portion and a round hole provided in one of the left and right side wall portions of the upper member, and the other side wall portion of the upper member. A stopper pin fixed to the upper member, and having a polygonal part fitted in the polygonal hole;
A rubber elastic member fixedly disposed in a compressed state between a rear portion of the floor plate portion of the base member and a rear portion of the top plate portion of the upper member,
When no person is sitting on the seat, the top plate portion of the upper member receives upward turning force by the rubber elastic member in the compressed state, and the shaft portion of the stopper pin is the upper end of the vertical slot At the upper limit position pressed by
Further, when a person sits on the seat, the rubber elastic member in the compressed state is further compressed by the weight of the person, and the upper member rotates downward with the rotation shaft pin as a rotation shaft, and the stopper A shaft tilting device, wherein the shaft portion of the pin moves downward from the upper limit position in each of the vertically elongated holes, and the angle of the seat portion and the backrest portion changes by tilting the upper member. .   The rear upper surface of the left wall portion and the rear upper surface of the right wall portion of the base member are configured by inclined surfaces that descend rearward, and when the person sits on the seat portion, the top plate portion of the upper member The chair tilting device according to claim 1, wherein tilting of the upper member is stopped when a rear lower surface comes into contact with each rear upper surface.   2. The chair tilt according to claim 1, wherein a concave portion is provided on a lower surface of the rubber elastic member, and a convex portion that fits into the concave portion is provided on the floor plate portion of the base member. apparatus.   The chair tilting according to claim 2, wherein a concave portion is provided on a lower surface of the rubber elastic member, and a convex portion that fits into the concave portion is provided on the floor plate portion of the base member. apparatus.   A plurality of attachment holes are provided in the top plate portion of the upper member, and attachment holes corresponding to attachment positions of a seat portion of a chair to which the chair tilting device is attached are selected and used. Item 2. The chair tilting device according to Item 1.   A plurality of attachment holes are provided in the top plate portion of the upper member, and attachment holes corresponding to attachment positions of a seat portion of a chair to which the chair tilting device is attached are selected and used. Item 3. A chair tilting device according to Item 2.   A plurality of attachment holes are provided in the top plate portion of the upper member, and attachment holes corresponding to attachment positions of a seat portion of a chair to which the chair tilting device is attached are selected and used. Item 4. The chair tilting device according to Item 3. A plurality of attachment holes are provided in the top plate portion of the upper member, and attachment holes corresponding to attachment positions of a seat portion of a chair to which the chair tilting device is attached are selected and used. Item 5. The chair tilting device according to Item 4.

Images