JP2003052478A - Device for suppressing rotation of rotary chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary chair rotation suppressing device which prevents the rotation of a seat as necessary, does not spoil outer appearance and also does not become an obstacle. SOLUTION: A support body 5 arranged on the lower surface of the seat is disposed so as to be rotatable in the upper end part of a gas cylinder 4 which is extendable/contractable but not rotatable and a rotation suppressing means 6 prevents the rotation of the seat in the rotary chair rotation suppressing device. An axial cylinder 7 attached to the upper end part of the gas cylinder is received so as to be rotatable by a bearing member 8 which is fixed to the support body. A suppressing board 9 having at least one suppressing edge 10 perpendicularly crossed with a rotary axial center is fixed as the rotation suppressing means to the upper end part of the axial cylinder which is projected above the bearing member. Then a lock member 11 which is abutted on the suppressing edge of the suppressing board so as to be engageable/detachable and prevents the rotation of the seat is arranged in the support body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation restricting device for a swivel chair, and more particularly to a rotation restricting device for making a seat portion of a swivel chair unrotatable when necessary.

[0002]

2. Description of the Related Art Conventionally, as rotation control devices for rotating chairs, Japanese Utility Model Publication No. 48-75907 and Japanese Utility Model Publication No. 53-73.
There is one described in Japanese Patent Laid-Open No. 07.

In the above-mentioned Japanese Utility Model Laid-Open No. 48-75907, the pipe installed below the seat is rotatably fitted on the upper end of the shaft erected on the leg, and the pipe is rotatably fitted. A fastening tool with a lever is screwed from the side, and the side surface of the shaft portion is pressed by the fastening tool to regulate the rotation. In this case, not only does the lever of the fastener greatly protrude laterally to impair the appearance, but it may also be an obstacle. Further, the shaft portion of the leg portion adjusts the height in multiple stages by screwing from the side, and does not include a gas cylinder.

Further, in the above-mentioned Japanese Utility Model Laid-Open No. 53-7307, a pipe installed below the seat is rotatably fitted on the upper end of the shaft erected on the leg. A part of the lower end of the pipe is cut out to expose the side surface of the leg, and a U-shaped bending arm is attached to the lower end of the pipe so as to surround it, and a cam is attached to the end of the bending arm. By pushing down the lever fixed to the cam, the cam is pressed against the side surface of the leg in the notch to regulate the rotation. Even in this case, the lever impairs the appearance and becomes an obstacle. Further, since the shaft portion is not provided with a gas cylinder, the chair is not a chair whose height can be easily adjusted.

[0005]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is to solve the problems by providing a leg cylinder with a gas cylinder that is expandable and non-rotatable and has an upper end portion. In a swivel chair with the seat part rotatably attached to the seat, it is possible to prevent the seat part from rotating when necessary, and the rotation control of the swivel chair does not impair the external appearance or hinder the appearance. The point is to provide a device.

[0006]

In order to solve the above-mentioned problems, the present invention is provided with a gas cylinder which is expandable and non-rotatable on a shaft portion of a leg portion, and the upper end portion of the gas cylinder has a lower surface of a seat portion. A rotation restricting device for a rotating chair in which a provided support is rotatably mounted and the seat is made non-rotatable by a rotation restricting means, wherein a shaft cylinder attached to an upper end of the gas cylinder is supported by the support. A rotatably received by a bearing member fixed to the body, and as the rotation restricting means, a restricting plate having at least one restricting edge orthogonal to the rotation axis at the upper end portion of the shaft cylinder protruding above the bearing member. A rotation restricting device for a rotating chair is provided, in which a locking member that is fixed and that releasably abuts on the restricting edge of the restricting plate to make the seat non-rotatable is provided on the support body.

Here, the regulation plate is provided with at least a pair of regulation edges that are parallel to each other at opposite positions on the outer periphery, and the locking member has a pair of abutment edges that abut the pair of regulation edges at the same time. In addition to being provided on the inner circumference of the opening, one end is attached to the support body by a horizontal support shaft so as to be vertically rotatable, and the locking member is vertically rotated by an operating means provided on the support body. The rotation restriction state in which the contact edge is in contact with the restriction edge and the rotatable state in which the contact edge is separated from the restriction edge are realized.

More specifically, the restriction plate is a hexagonal plate in plan view, the locking member is formed by forming a quadrangular opening in the center of the substrate, and the operating means is the support. By rotating a lever provided outside the body, a cam arranged in contact with the lower surface of the base plate of the locking member inside the support is rotated to vertically move the locking member. is there.

As the locking member of the rotation restricting means, a restricting screw threaded from the outside into the side surface of the support is used, and the restricting screw is advanced so that the tip of the restricting edge is the restricting edge of the restricting plate. It is also possible to realize a rotation restriction state in which the contact is made with the rotation restriction state and a rotation state in which the regulation screw is retracted so that the tip end thereof is separated from the regulation edge of the regulation plate.

[0010]

Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. 1 to 5 show a first embodiment of a rotation control device for a swivel chair according to the present invention, in which reference numeral 1 is a leg portion, 2 is a seat portion, 3 is a shaft portion, 4 is a gas cylinder, and 5 is a support. A body and a reference numeral 6 respectively indicate rotation restricting means.

The swivel chair according to the present embodiment is provided with a gas cylinder 4 which is expandable and non-rotatable on the shaft portion 3 of the leg portion 1, and a support 5 provided on the lower surface of the seat portion 2 at the upper end portion of the gas cylinder 4. Is rotatably mounted, and the rotation restricting means 6 prevents the seat portion 2 from rotating.
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 the rotation restricting means 6 projects upward from the bearing member 8. A restricting plate 9 having at least one restricting edge 10 orthogonal to the axis of rotation is fixed to the upper end of the barrel 7, and the restricting plate 9 is detachably abutted against the restricting edge 10 of the restricting plate 9. The support member 5 is provided with a locking member 11 for making the rotation impossible.

More specifically, as shown in FIG. 1, the leg portion 1 is formed by arranging the shaft portion 3 upright at the center of a plurality of radially extending support legs 12 ,. Has a built-in expandable and non-rotatable gas cylinder 4,
A support 4 mounted on the lower surface of the seat 2 is rotatably mounted on the upper end of the gas cylinder 4.

As shown in FIGS. 2 and 3, the shaft cylinder 7 has a tapered central hole 14 into which the tapered taper portion 13 at the upper end of the gas cylinder 4 is non-rotatably fitted.
And a flange plate 15 is fixed around the lower end portion so as to be orthogonal to the axis, and an annular groove 16 is provided around the upper end portion.
And a pair of parallel fitting surfaces 17, 17 are formed.

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 barrel 7. It has a tubular portion 20 through which the tubular portion 19 of the barrel 7 is inserted, and the tubular portion 20 is fixed to a fixed base 21 having a U-shaped cross section. The lower end of the tubular 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 fixed base 21 are attached to the upper surface of the bottom surface portion 18. Weld to and fix.

As shown in FIG. 3, the lower sliding member 24 is interposed between the cylindrical portion 19 of the shaft cylinder 7 and the cylindrical portion 20 of the bearing member 8 facing the circular hole 22 of the support 5. And an upper sliding member 25 is interposed between the upper portions of the tubular portion 19 and the tubular portion 20, and further the upper end of the tubular portion 19 of the shaft tube 7 protruding upward from the upper end of the tubular portion 20. To the department
The fitting hole 26 formed in the central portion of the regulation plate 9 is non-rotatably fitted, and the C ring 16A is fitted in the annular groove 16.
To prevent the restriction plate 9 from coming off. here,
The lower sliding member 24 is made of a synthetic resin having excellent sliding characteristics, and has a sleeve 27 inserted between the tubular portion 19 of the barrel 7 and the barrel 20 of the bearing member 8, and the barrel. 7 and a slider plate 28 interposed between the lower surface of the bottom surface portion 18 of the support body 5. Further, the upper sliding member 25 is made of a synthetic resin having excellent sliding characteristics, and has a tubular portion 19 of the shaft barrel 7 and a tubular portion 2 of the bearing member 8.
And a slider plate 30 interposed between the upper end of the cylinder portion 19 of the shaft cylinder 7 and the lower surface of the regulation plate 9.

As shown in FIG. 4, the regulation plate 9 constituting the rotation regulating means is provided with at least a pair of regulation edges 10 parallel to each other at opposite positions on the outer circumference. Specifically, it is a plate having a hexagonal shape in a plan view, which has three pairs of restriction edges 10, 10. Further, the locking member 11 that constitutes the rotation restricting means is provided with the restricting plate 9
A pair of contact edges 32, 32 that simultaneously contact the pair of restriction edges 10, 10 are provided on the inner circumference of the opening 31, and one end of the support edge 5 is supported by a horizontal support shaft 33 on both side surface portions 34 of the support 5.
The connection plate 36 is rotatably attached to the base plate 34. More specifically, the square opening 31 is formed in the central portion of the substrate 35, and the connecting plate 36 is formed upright on both sides of one end of the substrate 35. , 36 are rotatably attached to both side surface portions 34, 34 of the support 5 by the support shafts 33, 33.

Further, as shown in FIGS. 2 and 5, the locking member 11 is vertically rotated by the operating means 37 provided on the support body 5, and the contact edge 32 of the locking member 11, Thus, the rotation regulation state in which 32 is in contact with the regulation edges 10, 10 of the regulation plate 9 and the rotatable state in which the contact edge 23 is separated from the regulation edge 10 are realized. More specifically, the operating means 37 includes a shaft 38 on the side surface 34 of the support 5.
Is rotatably penetrated, a lever 39 is fixed to one end of the shaft 38 outside the support 5, and a cam 40 fixed to the other end of the shaft 38 is brought into contact with the lower surface of the base plate 35 of the locking member 11. It is arranged at the position, and the lever 39 is rotated to cause the cam 40 to move the locking member 1.
By pushing up the lower surface of the first substrate 35, the locking member 11 can be moved up and down. Here, the cam 40 is
In the rotation restricted 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 in the rotatable state in which the contact edge 23 is separated from the restriction edge 10,
Each has a first cam portion 41 and a second cam portion 42 that support the lower surface of the substrate 35. Also, the shaft 38
The distance to the second cam portion 42 is set to be larger than the distance from the axis of the first cam portion 41.

FIG. 5A shows a rotation restricted state, in which the first cam portion 41 of the cam 40 is provided with the base plate 3 of the locking member 11.
5 is placed, the regulation plate 9 is fitted in the opening 31 of the locking member 11, and the contact edge 3 formed in the opening 31.
2, 32 abut the regulating edges 10, 10 of the regulating plate 9,
The rotation of the seat 2 is restricted with respect to the leg 1. 5B shows a rotatable state, and when the lever 39 is rotated 90 degrees from the state of FIG. 5A, the substrate 35 of the locking member 11 is mounted on the second cam portion 42 of the cam 40. Placed, the locking member 11 is completely separated from the regulation plate 9,
The seat 2 can freely rotate with respect to the leg 1. Then, after the seat 2 is turned to the front, when the lever 39 is rotated 90 degrees in the opposite direction from the state of FIG. 5B, the locking member 11 is lowered by its own weight, and the locking member 11 of FIG. It becomes a state. Here, when the restriction plate 9 cannot be completely received in the opening 31 of the locking member 11, the seat portion 2 may be shaken slightly to the left and right. The locking member 1
It is also preferable to interpose a tension coil spring between the free end of the base plate 35 and the support 5 at a proper position so as to elastically bias the locking member 11 in a direction to rotate downward. In addition, the support shaft 33
It is also preferable that the coil portion of the kick spring is attached to one side, and one bullet piece is locked to the side surface portion 34 of the support body 5, and the other bullet piece is locked to the connecting plate 36 or the substrate 35.

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 2 by pushing the pin 43 at the upper end thereof. Its operating lever 4
Reference numeral 4 denotes a support rod 47 which is fixed to the inner surface of the side surface portion 34 by passing an operating rod 46 having a handle 45 fixed at one end through the side surface portion 34 of the support body 5 and crossing and fixing the support rod 47 to an intermediate portion of the operation rod 46. The gas cylinder is mounted by a tool 48 so as to be vertically swingable, and an operating portion 49 formed by bending the tip end portion of the operating rod 46 downward is inserted into the central hole 14 of the shaft cylinder 7 from above to form the gas cylinder. It is brought into contact with the pin 43 of No. 4. And
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.

Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, as the locking member of the rotation restricting means 6, a restricting screw 50 threaded through the front surface portion 34A of the support 5 from the outside is used.
Is rotated forward and its tip is in contact with the regulation edge 10 of the regulation plate 9 in a rotation regulation state, and the regulation screw 50 is retracted so that the tip is rotatable away from the regulation edge 10 of the regulation plate 9. The state is realized. The regulation screw 50 includes a screw shaft portion 51 and a handle portion 5 fixed to one end thereof.
2 and has a structure in which the screw shaft portion 51 is screwed into a nut 53 fixed to the inner surface of the side surface portion 34 of the support body 5.

Finally, a mechanism for adjusting the backrest portion 54 provided at the rear portion of the seat portion 2 to the front and rear and up and down will be described with reference to FIGS. The swivel chair according to the present embodiment is mainly intended for use by children, and is extremely unstable when the seat portion 2 freely rotates when the foot does not reach the floor surface. The rotation of the seat portion 2 was restricted. Further, when the backrest portion 54 is fixed,
The back of the occupant may not reach the backrest part 54 depending on the physical constitution of the occupant, but in order to eliminate the problem, the backrest part 54 can be adjusted in the front-back direction and forward. At the same time it moves, it lowers. Therefore, the connecting rods 56 connected to the lower end portions of the backrest support rods 55, 55 arranged on both sides of the seat portion 2,
It is fixed to the moving body 58 slidably mounted on the support rails 57, 57 which are attached to the outer surfaces of the both side portions 34, 34 of the support body 5 in a front-down inclined state.

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 provided on the side surface of the support body 5. It is attached to the portion 34 by welding. The moving body 58 has a convex surface 61 projecting upward in the central portion, and sliders 63, 63 which are in sliding contact with the lower surface 62 of the support body 5 are attached to both sides of the upper surface of the convex surface 61. The holding pieces 65, 65 having a substantially L-shaped cross section are formed by bending inside the upper ends of the side plates 64, 64 that are raised up, and the both holding pieces 65, 65 are slidably fitted in the guide groove 59 of the support rail 57. The sliders 66, 66 are attached. Then, the connecting rod 56 is fixed to both sides of the lower surface of the moving body 58 by two fixing fittings 67, 67.

As described above, the movable body 58 is moved forward while the sliders 66, 66 and the sliders 63, 63 are in sliding contact with the guide grooves 59, 59 of the support rails 57, 57 and the lower surface 62 of the support body 5, respectively. It moves back and forth along the downward slope trajectory. Along with this, the backrest portions 54 attached to the upper portions of the two backrest support rods 55, 55 can be moved back and forth and up and down to adjust their positions. Here, in order to maintain the state after adjusting the position of the backrest portion 54, the movable body 58 is provided with a stopper 68 in the present embodiment. The stopper 68 has a substantially U-shaped shape in plan view, and has arms 70, 70 extending forward on both sides of a handle plate 69. The arms 70, 70 are attached to both side plates 64, 64 of the moving body 58. A support shaft 71 that is disposed along the inner side of the
Locking holes 72 are formed so as to be pivotable up and down, and locking pieces 72, 72 are formed inwardly at the front ends of both arms 70, 70 at regular intervals at the lower outer corners of the support rail 57. , 73, ... The handle plate 69 of the stopper 68 is located behind the movable body 58 and extends downward, and extends to the rear end of the convex surface 61 of the movable body 58 through an opening 74 formed in the central portion of the handle plate 69. The provided finger contact plate 75 is loosely fitted and arranged at the rear part of the handle plate 69.

Here, if the center of gravity of the stopper 68 is set rearward of the support shaft 71, the front ends of the arms 70, 70 always rotate upward about the support shaft 71 so that the stopper 68 is engaged. It is preferable that the stoppers 72, 72 engage with the locking holes 73, 73 of the support rail 57. When the center of gravity of the stopper 68 is not set rearward of the support shaft 71, the stopper 68 is moved in the direction in which the locking pieces 72, 72 engage with the locking holes 73, 73 of the support rail 57.
Elastically bias. In order to operate the stopper 68, the front ends of the arms 70, 70 are lowered by pinching the finger contact plate 75 and the grip plate 69 with fingers, and the locking pieces 72, 72 are locked in the locking holes 73, 70. Since it is separated from 73, the moving body 58 can be moved in the front-back direction.

[0025]

As described above, the rotation restricting device for a swivel chair according to the first aspect of the present invention is provided with a gas cylinder which is expandable and non-rotatable on a shaft portion of a leg portion, and a seat portion is provided at an upper end portion of the gas cylinder. A rotation restricting device for a rotating chair, wherein a support provided on the lower surface of the gas cylinder is rotatably mounted, and the seat is non-rotatable by a rotation restricting means. A rotatably received by a bearing member fixed to the support, and as the rotation restricting means, at least one restricting edge orthogonal to the rotation axis is provided at an upper end portion of the barrel protruding upward from the bearing member. Since the support member is provided with a locking member for fixing the regulation plate and removably contacting the regulation edge of the regulation plate to make the seat portion non-rotatable, the seat portion is rotated when necessary. Can be disabled and wear Since the seat part does not rotate unexpectedly in this state, a stable seating posture can be obtained, and since the rotation restricting means can be built in the support body that supports the seat part on the legs, it is also neat in appearance. It becomes something like.

According to the second and third aspects, the rotation of the seat portion can be surely restricted, the durability is high, and the reliability is excellent.

According to the fourth aspect of the present invention, the structure of the rotation restricting means is simplified, and the swivel chair incorporating the rotation restricting device can be provided at a low cost.

[Brief description of 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 essential parts showing a rotation regulating device of the present invention.

FIG. 3 is a vertical cross-sectional side view of essential parts in the same assembled state.

FIG. 4 is a plan view of the same main portion.

5A and 5B also show the operation of the rotation restricting device, FIG. 5A is a longitudinal sectional view of a main part showing a rotation restricted state, and FIG. 5B is a vertical sectional view of a main part showing a rotatable state.

FIG. 6 shows a second embodiment of the rotation restricting device of the present invention,
(A) is a longitudinal cross-sectional view of a main part, and (b) is a side view of the main part.

FIG. 7 is a vertical cross-sectional side view of essential parts showing an adjusting mechanism of a backrest part of a swivel chair according to the present invention.

FIG. 8 is likewise an exploded perspective view of a main part.

FIG. 9 is an exploded perspective view showing a slide mechanism of the same.

FIG. 10 is a vertical sectional front view of the same main portion.

[Explanation of symbols]

1 leg 2 seat 3 Shaft 4 Gas cylinder 5 Support 6 Rotation restriction means 7 Shaft cylinder 8 Bearing member 9 regulation plate 10 regulation edge 11 Locking member 12 Support leg 13 Tapered taper portion 14 Center hole 15 Flange plate 16 Annular groove 16A C ring 17 Mating surface 18 Bottom part 19 Tube part 20 Cylinder 21 Fixed 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 32 abutment edge 33 support shaft 34 Sides 34A Front 35 substrate 36 connecting plate 37 Operating means 38 Shaft 39 Lever 40 Cam 41 1st cam part 42 2nd cam part 43 pin 44 control lever 45 handle 46 operating rod 47 Support Rod 48 Bearing Tool 49 Operation part 50 Control screw 51 screw shaft portion 52 handle portion 53 nuts 54 backrest 55 Backrest Support Rod 56 Connection Rod 57 support rail 58 moving body 59 Guide groove 60 Fixing plate 61 convex surface 61 convex surface 62 lower 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 Locking piece 73 Locking hole 74 opening 75 finger pad

Claims (4)

[Claims] 1. A leg cylinder is provided with an expandable and non-rotatable gas cylinder, and a support provided on the lower surface of the seat is rotatably attached to the upper end of the gas cylinder.
A rotation restricting device for a rotating chair, which prevents the seat part from rotating by a rotation restricting means, wherein a shaft cylinder attached to the upper end of the gas cylinder is rotatably received by a bearing member fixed to the support. As the rotation restricting means, a restricting plate having at least one restricting edge orthogonal to the axis of the rotating shaft is fixed to an upper end portion of the shaft cylinder projecting upward from the bearing member, and is engaged with the restricting edge of the restricting plate. A rotation restricting device for a swivel chair, wherein a locking member that removably abuts to lock the seat is provided on the support. 2. The regulation plate is provided with at least a pair of regulation edges parallel to each other at opposing positions on the outer periphery, and the locking member opens a pair of abutment edges that abut the pair of regulation edges at the same time. In addition to being provided on the inner circumference of the part, one end is attached to the support body so as to be vertically rotatable by a horizontal support shaft, and the locking member is vertically rotated by an operating means provided on the support body, The rotation restricting device for a rotating chair according to claim 1, wherein a rotation restricting state in which the contact edge contacts the restricting edge and a rotatable state in which the contact edge is separated from the restricting edge are realized. 3. The regulation plate is a hexagonal plate in plan view, the locking member is formed by forming a quadrangular opening in a central portion of a substrate, and the operation means is provided outside the support body. 3. The rotating operation of a lever provided therein causes a cam arranged in contact with the lower surface of the base plate of the locking member inside the support body to rotate, thereby vertically moving the locking member. Rotation control device for the swivel chair described. 4. As a locking member of the rotation restricting means, a restricting screw threaded through the side surface of the support from the outside is used, and the restricting screw is advanced so that the tip thereof is a restricting edge of the restricting plate. 2. The rotation restricting device for a swivel chair according to claim 1, wherein the rotation restricting device is brought into contact with the rotary restricting device, and the restricting screw is retracted to realize a rotatable condition in which a tip end thereof is separated from a restricting edge of the restricting plate.