JP3837615B2 - Rotation control device for swivel chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation restricting device for a swivel chair, and more particularly to a rotation restricting device that disables rotation of a seat portion of the swivel chair when necessary.
[0002]
[Prior art]
Conventionally, as a rotation restricting device for a swivel chair, those described in Japanese Utility Model Laid-Open No. 48-75907 and Japanese Utility Model Laid-Open No. 53-7307 exist.
[0003]
In the above-mentioned Japanese Utility Model Publication No. 48-75907, a pipe provided under a seat is rotatably fitted on an upper end of a shaft provided upright on a leg, and the pipe is laterally fitted to the pipe. Then, a fastening tool with a lever is screwed together, and the side of the shaft portion is pressed with the fastening tool to restrict rotation. In this case, the lever of the fastening tool protrudes greatly to the side, not only deteriorating the appearance but also getting in the way. Further, the shaft portion of the leg portion is adjusted in height in multiple stages by screwing from the side, and is not provided with a gas cylinder.
[0004]
Further, in the above-mentioned Japanese Utility Model Publication No. 53-7307, a pipe provided below a seat is rotatably fitted on an upper end of a shaft provided upright on a leg, and A part of the lower end is notched to expose the side surface of the leg, and a U-shaped bending arm is attached to the lower end of the pipe, and a cam is attached to the end of the bending arm. By depressing the fixed lever, the cam is pressed against the side surface of the leg portion within the cutout portion to restrict rotation. Also in this case, the lever deteriorates the appearance and gets in the way. Further, the shaft portion is not provided with a gas cylinder and is not a chair that can easily adjust the height of the seat portion.
[0005]
[Problems to be solved by the invention]
Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem by providing a gas cylinder that is extendable and non-rotatable on the shaft part of the leg part, and a seat part is rotatably attached to the upper end part of the gas cylinder. In the swivel chair, it is possible to make the seat portion non-rotatable when necessary, and to provide a rotation restricting device for the swivel chair that does not impair the appearance and get in the way.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is provided with a gas cylinder that is extendable and non-rotatable on the shaft portion of the leg portion, and a support body provided on the lower surface of the seat portion is rotatably attached to the upper end portion of the gas cylinder. And a rotation restricting device for a swivel chair in which the seat portion cannot be rotated by the rotation restricting means, wherein the shaft cylinder attached to the upper end portion of the gas cylinder is rotated by a bearing member fixed to the support. The rotation restricting means is capable of receiving a restriction plate fixed to an upper end portion of the shaft cylinder protruding upward from the bearing member, and a seat provided in contact with the restriction plate so as to be detachable from the support plate. The restricting plate is a hexagonal plate in plan view having three pairs of restricting edges parallel to each other perpendicular to the rotation axis of the shaft cylinder. The stop member simultaneously contacts the pair of restriction edges. A pair of abutting edges are provided on the inner periphery of the opening, and one end is attached to the support body so as to be vertically rotatable with a horizontal support shaft, and the operating means is provided with the locking member on the support body The rotation restricting device of the swivel chair is realized by rotating up and down to realize a rotation restricting state in which the abutting edge contacts the restricting edge and a rotatable state in which the abutting edge is separated from the restricting edge. Configured.
[0007]
Here, the locking member is formed by forming a square opening at the center of the substrate.
[0008]
Further, the operating means rotates a lever provided outside the support, thereby rotating a cam disposed in contact with the bottom surface of the locking member inside the support to engage the engagement. The stop member is operated to move up and down.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 1 to 5 show a first embodiment of a rotation restricting device for a swivel chair according to the present invention, in which 1 is a leg, 2 is a seat, 3 is a shaft, 4 is a gas cylinder, and 5 is a support. The bodies 6 indicate rotation restricting means.
[0010]
The swivel chair in the present embodiment includes a gas cylinder 4 that is extendable and non-rotatable on the shaft 3 of the leg 1, and a support 5 provided on the lower surface of the seat 2 can be rotated at the upper end of the gas cylinder 4. And the rotation restricting means 6 makes the seat 2 non-rotatable. The shaft cylinder 7 attached to the upper end of the gas cylinder 4 is rotatably received by a bearing member 8 fixed to the support body 5 and protrudes upward from the bearing member 8 as the rotation restricting means 6. A restriction plate 9 having at least one restriction edge 10 orthogonal to the rotation axis is fixed to the upper end portion of the shaft cylinder 7, and the seat portion 2 comes into contact with the restriction edge 10 of the restriction plate 9 so as to be detachable. The support member 5 is provided with a locking member 11 that cannot rotate.
[0011]
More specifically, as shown in FIG. 1, the leg portion 1 is configured such that the shaft portion 3 is erected at the center of a plurality of radially extending support legs 12,. A gas cylinder 4 that can rotate but cannot be rotated is built in, and a support 4 attached to the lower surface of the seat 2 is rotatably mounted on the upper end of the gas cylinder 4.
[0012]
As shown in FIGS. 2 and 3, the shaft cylinder 7 has a tapered center hole 14 in which the tapered taper portion 13 at the upper end portion of the gas cylinder 4 is fitted in a non-rotatable manner. A flange plate 15 is fixed to the periphery so as to be orthogonal to the axis, and an annular groove 16 and a pair of parallel fitting surfaces 17 and 17 are formed around the upper end portion.
[0013]
As shown in FIGS. 2 and 3, the bearing member 8 is a member that is fixed to the upper surface of the horizontal bottom surface portion 18 of the support 5 and rotatably receives the shaft cylinder 7. A cylindrical portion 20 is inserted through the cylindrical portion 19, and the cylindrical portion 20 is fixed to a fixed base 21 having a U-shaped cross section. The lower end of the cylindrical portion 20 of the bearing member 8 is fitted into the circular hole 22 formed in the bottom surface portion 18 of the support 5, and the lower ends of both leg plates 23, 23 of the fixing base 21 are connected to the upper surface of the bottom surface portion 18. Weld and fix to.
[0014]
Then, as shown in FIG. 3, the tube portion 19 of the shaft tube 7 is inserted into the tube portion 20 of the bearing member 8 facing the circular hole 22 of the support 5 with a downward sliding member 24 interposed. In addition, an upper sliding member 25 is interposed between the upper portion of the tube portion 19 and the tube portion 20, and further, on the upper end portion of the tube portion 19 of the shaft tube 7 protruding above the upper end of the tube portion 20, A fitting hole 26 formed in the central portion of the restriction plate 9 is fitted in a non-rotatable manner, and a C ring 16A is fitted into the annular groove 16 to prevent the restriction plate 9 from being removed. Here, the lower sliding member 24 is made of a synthetic resin having excellent sliding characteristics, and a sleeve 27 inserted between the cylindrical portion 19 of the shaft cylinder 7 and the cylindrical portion 20 of the bearing member 8; It comprises a flange plate 15 of the shaft cylinder 7 and a slider plate 28 interposed between the lower surface of the bottom surface portion 18 of the support 5. The upper sliding member 25 is made of a synthetic resin having excellent sliding characteristics, and a sleeve 29 inserted between the cylindrical portion 19 of the shaft cylinder 7 and the cylindrical portion 20 of the bearing member 8; The slider plate 30 is interposed between the upper end of the cylinder portion 19 of the shaft cylinder 7 and the lower surface of the restriction plate 9.
[0015]
As shown in FIG. 4, the restricting plate 9 constituting the rotation restricting means is provided with at least a pair of restricting edges 10 and 10 parallel to each other at opposing positions on the outer periphery, more specifically. It is a hexagonal plate in plan view having three pairs of regulating edges 10 and 10 around it. In addition, the locking member 11 constituting the rotation restricting means is provided with a pair of contact edges 32, 32 that simultaneously contact the pair of restricting edges 10, 10 of the restricting plate 9 on the inner periphery of the opening 31, One end portion is attached to both side surface portions 34, 34 of the support 5 with a horizontal support shaft 33 so as to be vertically rotatable. More specifically, the square opening 31 is formed at the center of the substrate 35. The connecting plates 36, 36 formed and raised on both sides of one end portion of the substrate 35 are attached to the side surface portions 34, 34 of the support 5 so as to be rotatable about the support shafts 33, 33.
[0016]
Further, as shown in FIGS. 2 and 5, the locking member 11 is rotated up and down by operating means 37 provided on the support 5, and the contact edges 32 and 32 of the locking member 11 are The rotation restricting state where the restricting plate 9 is in contact with the restricting edges 10 and 10 and the rotatable state where the abutting edge 23 is separated from the restricting edge 10 are realized. More specifically, the operating means 37 passes a shaft 38 rotatably through the side surface 34 of the support 5, fixes a lever 39 to one end of the shaft 38 outside the support 5, and A cam 40 fixed to the other end of the locking member 11 is disposed at a position where the cam 40 abuts against the lower surface of the substrate 35 of the locking member 11. The lever 40 is rotated and the cam 40 rotates the lower surface of the substrate 35 of the locking member 11. And the locking member 11 is moved up and down. Here, the cam 40 includes a rotation restriction state in which the contact edges 32, 32 of the locking member 11 contact the restriction edges 10, 10 of the restriction plate 9, and the contact edge 23 from the restriction edge 10. The first cam portion 41 and the second cam portion 42 that respectively support the lower surface of the substrate 35 are provided in the rotatable state apart from each other. Further, the distance to the second cam portion 42 is set larger than the distance from the axis of the shaft 38 to the first cam portion 41.
[0017]
FIG. 5A shows a rotation restricted state, where the substrate 35 of the locking member 11 is placed on the first cam portion 41 of the cam 40, and the restriction plate is placed in the opening 31 of the locking member 11. 9 is fitted, and the contact edges 32, 32 formed in the opening 31 are in contact with the restriction edges 10, 10 of the restriction plate 9, and the rotation of the seat part 2 is restricted with respect to the leg part 1. ing. FIG. 5B shows a rotatable state. When the lever 39 is rotated 90 degrees from the state of FIG. 5A, the substrate 35 of the locking member 11 is placed on the second cam portion 42 of the cam 40. The locking member 11 is completely separated from the restricting plate 9 and the seat 2 can freely rotate with respect to the leg 1. Then, after the seat portion 2 is directed to the front, when the lever 39 is rotated 90 degrees in the reverse direction from the state of FIG. 5B, the locking member 11 is lowered by its own weight, and as shown in FIG. It becomes a state. Here, when the restriction plate 9 is not completely received in the opening 31 of the locking member 11, the seat 2 may be slightly swung left and right. In addition, it is also preferable that a tension coil spring is interposed between the free end of the substrate 35 of the locking member 11 and the support body 5 so that the locking member 11 is elastically biased in a downward rotating direction. Further, a coil portion of a kick spring is attached to the support shaft 33, and one bullet piece is locked to the side surface portion 34 of the support 5, and the other bullet piece is locked to the connecting plate 36 or the substrate 35. It is also preferable to do.
[0018]
Further, the gas cylinder 4 can be expanded and contracted in the same manner as the conventional one by adjusting the height of the seat portion 2 by pushing the pin 43 at the upper end thereof. The operating lever 44 has an operating rod 46 having a handle 45 fixed to one end thereof, penetrates the side surface portion 34 of the support 5, and a support rod 47 fixed to the intermediate portion of the operating rod 46 is fixed to the side surface portion 34. It is attached to the inner surface by a bearing tool 48 so as to be swingable up and down, and an operation portion 49 formed by bending the tip end portion of the operation rod 46 downward is made to enter the center hole 14 of the shaft cylinder 7 from above, The gas cylinder 4 is in contact with the pin 43. Then, by pulling up the handle 45 of the operation lever 44, the pin 43 is pushed in and the gas cylinder 4 is expanded and contracted.
[0019]
Next, rotation regulation is also possible with the structure as shown in FIG. 6 shows, as a locking member of the rotation restricting means 6, a restriction screw 50 threaded through the front surface portion 34A of the support 5 from the outside is used, and the restriction screw 50 is advanced, The rotation restriction state in which the front end is in contact with the restriction edge 10 of the restriction plate 9 and the rotation state in which the tip is separated from the restriction edge 10 of the restriction plate 9 by retreating the restriction screw 50 are realized. It will be. The restriction screw 50 includes a screw shaft portion 51 and a handle portion 52 fixed to one end thereof, and has a structure in which the screw shaft portion 51 is screwed to a nut 53 fixed to the inner surface of the side surface portion 34 of the support 5. is there.
[0020]
Finally, a mechanism for adjusting the backrest part 54 provided at the rear part of the seat part 2 back and forth and up and down will be described with reference to FIGS. The swivel chair according to the present embodiment is mainly assumed to be used by a child, and when the foot does not reach the floor, it is very unstable when the seat 2 freely rotates. The rotation of the seat 2 is restricted. In addition, when the backrest 54 is fixed, the back of the seated person may not reach the backrest 54 depending on the physique of the seated person. In addition to being able to adjust in the direction, it is moved forward and lowered at the same time. Therefore, the connecting rods 56 connected to the lower end portions of the backrest supporting rods 55, 55 arranged on both sides of the seat portion 2 are attached to the outer surfaces of the side surface portions 34, 34 of the support body 5 in a state of being inclined forward and downward. It is fixed to the moving body 58 that is slidably mounted on the support rails 57 and 57.
[0021]
More specifically, as shown in FIGS. 8 and 9, the support rail 57 has a substantially U-shaped cross section with the guide groove 59 facing upward, and the inner fixing plate 60 is attached to the side surface 34 of the support 5. Install by welding. The moving body 58 has a convex surface 61 protruding upward at the center, and sliders 63, 63 slidably contacting the lower surface 62 of the support 5 are attached to both sides of the upper surface of the convex surface 61, and both sides of the convex surface 61 are attached. The holding plates 65 and 65 having a substantially L-shaped cross section are formed on the inner side of the upper ends of the side plates 64 and 64 that are raised up, and the holding pieces 65 and 65 are slidably fitted into the guide groove 59 of the support rail 57. The sliders 66 and 66 are fitted. The connecting rod 56 is fixed to the both sides of the lower surface of the moving body 58 by two fixing brackets 67 and 67.
[0022]
As described above, the moving body 58 has a forward downward inclined locus while the sliders 66 and 66 and the sliders 63 and 63 are in sliding contact with the guide grooves 59 and 59 of the support rails 57 and 57 and the lower surface 62 of the support body 5, respectively. Move forward and backward along. Accordingly, the backrest portion 54 attached to the upper portions of the backrest support rods 55, 55 moves back and forth and up and down, and the position can be adjusted. Here, after adjusting the position of the backrest part 54, in order to maintain the state, in this embodiment, the moving body 58 is provided with a stopper 68. The stopper 68 has a substantially U-shape in plan view, and has arms 70, 70 extending forward on both sides of the handle plate 69, and both arms 70, 70 are connected to both side plates 64, 64 of the moving body 58. The rear end of the arm 70 is attached to the both side plates 64, 64 so as to be pivotable up and down, and is formed inwardly at the front ends of both arms 70, 70. The stop pieces 72 are configured to be engaged with any one of locking holes 73 formed at regular intervals on the lower outer corner of the support rail 57. The grip plate 69 of the stopper 68 extends downward and behind the movable body 58 and extends to the rear end of the convex surface 61 of the movable body 58 in an opening 74 formed at the center of the grip plate 69. The provided finger pad 75 is loosely fitted and arranged at the rear part of the handle plate 69.
[0023]
Here, if the center of gravity of the stopper 68 is set to the rear of the support shaft 71, the front ends of the arms 70, 70 always rotate upward about the support shaft 71, and the locking piece 72. , 72 are preferably engaged with the locking holes 73, 73 of the support rail 57. If the center of gravity of the stopper 68 is not set behind the support shaft 71, the stopper 68 is moved in the direction in which the locking pieces 72, 72 are engaged with the locking holes 73, 73 of the support rail 57. Is elastically biased. In order to operate the stopper 68, the front ends of the arms 70, 70 are lowered by sandwiching the finger rest plate 75 and the handle plate 69 with fingers, and the locking pieces 72, 72 are connected to the locking holes 73, 72. Therefore, the moving body 58 can be moved in the front-rear direction.
[0024]
【The invention's effect】
The rotation restricting device for a swivel chair according to the first aspect of the present invention comprises a gas cylinder that is extendable and non-rotatable on the shaft portion of the leg portion, and is provided on the lower surface of the seat portion at the upper end portion of the gas cylinder. A rotation restricting device for a swivel chair in which a support body is rotatably mounted and the seat portion cannot be rotated by rotation restricting means, and a shaft cylinder attached to an upper end portion of the gas cylinder is attached to the support body. The rotation restricting means is rotatably received by a fixed bearing member, and the rotation restricting means can be engaged with and disengaged from the restricting plate provided on the support body and a restricting plate fixed to an upper end portion of the shaft cylinder protruding above the bearing member. The restriction plate is a hexagonal shape in plan view having three restriction edges parallel to each other perpendicular to the rotation axis of the shaft cylinder. The locking member is the plate. A pair of contact edges that simultaneously contact the pair of regulating edges are provided on the inner periphery of the opening, and one end is attached to the support body with a horizontal support shaft so as to be vertically rotatable. By rotating up and down with the operating means provided on the support, the rotation restriction state in which the contact edge is in contact with the restriction edge and the rotation state in which the contact edge is separated from the restriction edge are realized . The seat portion can be made non-rotatable when necessary, and the seat portion does not rotate unexpectedly in the seated state, so that a stable seating posture can be obtained, and the rotation restricting means can be attached to the leg portion. Since it can be incorporated in the supporting body to be supported, the appearance is also refreshed. Further, the rotation restricting means includes a hexagonal restricting plate in plan view having three pairs of restricting edges around and a pair of contact edges that are in contact with the pair of restricting edges of the restricting plate at the inner periphery of the opening. Since it consists of a stop member, the rotation of the seat portion can be reliably controlled, and the durability is high and the reliability is excellent.
[0025]
According to claim 2, since it is composed of a hexagonal restriction plate and a locking member having a quadrangular opening, the rotation of the seat can be reliably controlled, has high durability, and is reliable. It is excellent.
[0026]
According to a third aspect of the present invention, the operating means includes a cam arranged in contact with the bottom surface of the locking member inside the support by rotating a lever provided outside the support. Since the locking member is operated to move up and down by rotating, the rotation restricted state and the rotatable state can be easily realized.
[Brief description of the drawings]
FIG. 1 is a side view of a swivel chair to which a rotation restricting device according to the present invention is applied.
FIG. 2 is an exploded perspective view of a main part showing a rotation restricting device of the present invention.
FIG. 3 is a longitudinal side view of the main part in the same assembled state.
FIG. 4 is a plan view of the main part of the same.
5A and 5B also show the operation of the rotation restricting device, in which FIG. 5A is a longitudinal sectional view of a main part showing a rotation restricted state, and FIG. 5B is a longitudinal sectional view of a main part showing a rotatable state.
6A and 6B show another reference example of the rotation restricting device, in which FIG. 6A is a longitudinal sectional view of the main part, and FIG. 6B is a side view of the main part.
FIG. 7 is a longitudinal sectional side view of a main part showing an adjustment mechanism of a backrest part of a swivel chair according to the present invention.
FIG. 8 is an exploded perspective view of the main part of the same.
FIG. 9 is an exploded perspective view showing the slide mechanism.
FIG. 10 is a longitudinal front view of the main part of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Leg part 2 Seat part 3 Shaft part 4 Gas cylinder 5 Support body 6 Rotation restriction means 7 Shaft cylinder 8 Bearing member 9 Restriction board 10 Restriction edge 11 Locking member 12 Support leg 13 Tapered taper part 14 Center hole 15 Flange board 16 Annular groove 16A C-ring 17 Fitting surface 18 Bottom portion 19 Tube portion 20 Tube portion 21 Fixing base 22 Circular hole 23 Leg plate 24 Lower sliding member 25 Upper sliding member 26 Fitting hole 27 Sleeve 28 Slider plate 29 Sleeve 30 Slider plate 31 Opening Part 32 Contact edge 33 Support shaft 34 Side part 34A Front part 35 Substrate 36 Connecting plate 37 Operating means 38 Shaft 39 Lever 40 Cam 41 First cam part 42 Second cam part 43 Pin 44 Operation lever 45 Handle 46 Operation rod 47 Support Rod 48 Bearing 49 Operation part 50 Restriction screw 51 Screw shaft part 52 Handle part 53 Nut 54 Backrest part 55 Back support rod 56 Connection rod 57 Support rail 58 Moving body 59 Guide groove 60 Fixed plate 61 Convex surface 61 Convex surface 62 Bottom surface 63 Slider 64 Side plate 65 Holding piece 66 Slider 67 Fixing bracket 68 Stopper 69 Handle plate 70 Arm 71 Support shaft 72 Engagement Stopping piece 73 Locking hole 74 Opening 75 Finger pad

Claims (3)

A gas cylinder that is extendable and non-rotatable is provided on the shaft of the leg, and a support provided on the lower surface of the seat is rotatably mounted on the upper end of the gas cylinder. A rotation restricting device for a swivel chair that cannot be rotated, wherein a shaft cylinder attached to an upper end portion of the gas cylinder is rotatably received by a bearing member fixed to the support, and the rotation restricting means includes the bearing A restriction plate fixed to the upper end portion of the shaft cylinder protruding upward from the member, and a locking member provided on the support body and detachably abutting on the restriction plate to make the seat portion unrotatable. The restricting plate is a hexagonal plate in plan view having three pairs of restricting edges parallel to each other perpendicular to the rotation axis of the shaft cylinder, and the locking member simultaneously contacts the pair of restricting edges. A pair of contact edges that come into contact with each other are provided on the inner periphery of the opening. Both end parts are attached to the support body so as to be vertically rotatable with a horizontal support shaft, and the locking member is rotated up and down by operating means provided on the support body. A rotation restricting device for a swivel chair, characterized by realizing a rotation restricting state in which the abutment is in contact with the restricting edge and a rotatable state in which the abutting edge is separated from the restricting edge . The rotation restricting device for a swivel chair according to claim 1, wherein the locking member is formed by forming a rectangular opening at the center of the substrate . The operating means rotates a lever provided outside the support, thereby rotating a cam disposed in contact with the lower surface of the substrate of the locking member inside the support to rotate the locking member. The rotation restricting device for a swivel chair according to claim 1 or 2, wherein the swivel is operated to move up and down.

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