JP5484877B2 - Gas spring device - Google Patents

Description

  The present invention relates to a gas spring device.

  In general, in order to improve the sitting comfort when seated on a chair, a configuration in which a seat portion is supported via a gas spring device is known (for example, see Patent Document 1).

  This type of gas spring device can adjust the height of the chair by operating the lever, and the seat is rotatably supported. When the load (weight) acting on the seat disappears, the seat is A rotation position return mechanism (also referred to as an “auto return mechanism”) for returning to the initial position is provided.

  In the conventional gas spring device, the rotation position return mechanism includes a guide member fixed in the support cylinder and a rotation in which an inclined surface is formed on one side in the axial direction that rotates according to the rotation of the cylinder mechanism. A member, an inclined surface that contacts and separates from the inclined surface of the rotating member, is formed on one side, and is controlled by the rotation restricting member, and is movable only in the axial direction. And a spring member that biases in a direction in which the inclined surface of the rotating member abuts. The seat portion supported by the gas spring device is in an initial position in which the rotating member rotates about the axis so that the inclined surface of the elevating member and the inclined surface of the rotating member coincide with each other. Return to.

JP-A-9-108062

  However, in the conventional gas spring device, since the elevating member moves up and down in the axial direction and the rotation is restricted by the rotation restricting member, the convex portion protruding in the radial direction from the outer periphery of the elevating member rotates. The recess is formed to extend in the axial direction so as to engage with the recess of the restricting member and allow the elevating member to move up and down by the height adjusting operation.

  The convex part of the elevating member is fitted into the concave part of the rotation restricting member to be restricted from rotation, and moves up and down along the concave part of the rotation restricting member when adjusting the height of the seat part. A gap is provided for smooth up and down movement.

  Therefore, conventionally, since there is a gap (play) between the convex part of the elevating member and the concave part of the rotation restricting member, the movable elevating member is assembled in a state where the fixed side rotation restricting member is loose. However, when the seat supported by the gas spring device is returned to the initial position by the rotation position return mechanism, the position of the seat varies due to the gap (play).

  Then, this invention aims at providing the gas spring apparatus which solved the said subject.

  In order to solve the above problems, the present invention has the following means.

The present invention includes a support cylinder,
A cylinder that is inserted into the support cylinder, has one end projecting outward from the support cylinder in the axial direction, and is provided so as to be rotatable about an axis with respect to the support cylinder;
A piston slidably inserted into the cylinder;
A cylinder mechanism comprising a rod having one end connected to the piston and the other end extending from the other end of the cylinder and fixed to the other end of the support cylinder;
A rotation position return mechanism that is provided between the support cylinder and the cylinder mechanism and returns to a reference position with respect to rotation of the cylinder mechanism with respect to the support cylinder;
In the gas spring device for a chair in which a seat is attached to one end side of the cylinder mechanism,
The rotational position return mechanism is
An outer periphery is fixedly provided in the support cylinder, and a guide member into which the cylinder is inserted into the inner periphery ;
Housed in the guide member is engaged with the outer periphery of the cylinder da, a rotating member inclined surface on one side in the axial direction is formed to be rotated in accordance with the axis of rotation of the cylinder,
An inclined surface that contacts and separates from the inclined surface of the rotating member is formed on one side, the rotation is restricted by the rotation restricting member with respect to the guide member, and the cylinder is inserted and only in the axial direction. A movable lifting member;
The support cylinder is provided in the body, and a spring member for biasing the lifting member in the direction in which the inclined surface abuts the inclined surface and the rotating member of the elevating member,
The rotation restricting member is
Consists of a convex portion provided integrally with the lifting member, and a concave portion provided in the guide member corresponding to the convex portion,
The convex portion and the concave portion are formed in a tapered shape in which a width dimension in a circumferential direction becomes narrower as the rotating member and the elevating member move in a contact direction.

  According to the present invention, the convex and concave portions constituting the rotation restricting member are formed in a tapered shape whose width dimension in the circumferential direction becomes narrower as the rotation member and the elevating member come in contact with each other. When the member moves in the return direction due to the urging force of the spring member, the taper portion of the convex portion and the taper portion of the concave portion move in the axial direction and fit to each other, thereby rattling between the elevating member and the guide member. When the seat portion is returned to the initial position without any wobbling, there is no backlash in the circumferential direction, and the seat portion when the seat portion is returned to the initial position can be positioned at a predetermined position.

It is a longitudinal cross-sectional view which shows one Example of the gas spring apparatus by this invention. It is a side view which shows the initial position of the rotation position return mechanism of a gas spring apparatus. It is a longitudinal cross-sectional view which shows the initial position of the rotation position return mechanism of the gas spring apparatus which follows the AA line in FIG. 2A. It is a bottom view which shows the rotation position return mechanism of a gas spring apparatus. It is a side view which shows the rotation state of a rotation position return mechanism. It is a longitudinal cross-sectional view which follows the BB line in FIG. 3A. It is a side view which shows the guide member of a rotation position return mechanism. It is a longitudinal cross-sectional view which follows the CC line in FIG. 4A. It is a bottom view which shows the guide member of a rotation position return mechanism. It is a front view which shows the raising / lowering member of a rotation position return mechanism. It is a rear view which shows the raising / lowering member of a rotation position return mechanism. It is a top view which shows the sliding member of a rotation position return mechanism. It is a longitudinal cross-sectional view which follows the DD line | wire in FIG. 5A. It is a top view which shows the rotation member of a rotation position return mechanism. It is a longitudinal cross-sectional view which follows the EE line | wire in FIG. 6A. It is a longitudinal cross-sectional view which follows the FF line in FIG. 6A.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing an embodiment of a gas spring device according to the present invention. As shown in FIG. 1, the gas spring device 10 includes a valve mechanism 20 that acts as a height adjustment mechanism, and a rotational position return mechanism 30. In appearance, the gas spring device 10 has a rod protruding from a cylindrical body, and a leg portion 13 of the chair 12 is fitted to the lower end thereof. A bracket 16 that supports the seat portion 14 is fitted to the upper end of the gas spring device 10.

  The support cylinder 40 provided on the outer peripheral side of the gas spring device 10 is formed in a bottomed cylindrical shape in which a bottom opening is closed by a bottom plate 50. The outer cylinder 60 inserted into the support cylinder 40 protrudes from the upper end opening of the support cylinder 40 so as to be movable in the axial direction.

  The cylindrical space formed between the inner periphery of the support cylinder 40 and the outer periphery of the outer cylinder 60 is provided with a rotation position return mechanism 30 that returns the direction of the rotation direction of the chair 12 to the initial position. Yes. The rotation position return mechanism 30 is a mechanism that automatically returns the seat portion 14 to a predetermined orientation (initial position) when a person stands up and leaves the seat. The member 90, the spring member 100, etc. are generally configured.

  The guide member 70 is fixed to the inner peripheral side of the support cylinder 40 by caulking or the like, and guides the outer cylinder 60 in the axial direction and the rotation direction. Further, a concave portion in which the spring member 100 is accommodated is provided on the inner peripheral side of the guide member 70. The spring member 100 has an upper end in contact with the bottom of the elevating member 80 and a lower end in contact with the spring receiver 110 fixed to the support cylinder 40 by caulking.

  The rotating member 90 is rotatably supported by a thrust bearing 120 provided on the upper side. The rotating member 90 is fixed so as to rotate integrally with the outer cylinder 60 in the rotating direction, and supports the outer cylinder 60 so as to be movable only in the axial direction. Further, an inclined surface (cam surface) that contacts and separates from the inclined surface (cam surface) of the elevating member 80 is formed on the lower surface of the rotating member 90. The spring member 100 urges the elevating member 80 upward, and urges the inclined surfaces of the elevating member 80 and the rotating member 90 toward the initial position.

  Further, a wave washer 122 is provided between the upper end of the thrust bearing 120 and the inner peripheral side of the guide member 70. The wave washer 122 is a wave washer having a leaf spring action in which a concave portion and a convex portion whose upper and lower surfaces formed in an annular shape are curved in the axial direction are alternately formed in the circumferential direction, and the rotating member 90 and the thrust bearing 120. It is for giving axial force to.

Here, the configuration of the sheet cylinder mechanism 130. A plunger 140 is slidably fitted into the upper end opening of the outer cylinder 60. For example, when the plunger 140 is pressed downward by an external operation of the operation lever 150, the plunger 140 is lowered to the inside of the outer cylinder 60 to enable height adjustment.

  A cylinder 160 made of a metal tube is inserted inside the outer cylinder 60. In addition, a piston 170 and a piston rod 180 are slidably inserted in the inner bottom portion of the cylinder 160 in an axial direction, and a valve mechanism 20 that turns gas flow on or off is provided at the upper end of the cylinder 160. It has been. The valve mechanism 20 constitutes a height adjustment mechanism that performs a height adjustment operation of the seat portion 14 by circulating a flow of pressurized gas while a person is seated on the seat portion 14. A gas flow passage (not visible in FIG. 1) that communicates between the chamber 160A and the communication passage formed on the outer periphery of the cylinder 160, and a spool valve 144 provided on the rod 142 of the plunger 140 penetrating vertically. It is configured. The spool valve 144 is in a closed position where the gas flow passage of the valve mechanism 20 is blocked when the plunger 140 is not pressed.

  The upper end of the rod 142 is in contact with the lower end of the plunger 140. When the plunger 140 is pressed by the operation lever 150 in the seated state, the rod 142 is displaced downward, and the constricted portion of the spool valve 144 is moved to the valve mechanism. The position is shifted from the closed position where the 20 gas flow passages are blocked to the open position where the gas flow passages are communicated.

  The inside of the cylinder 160 is filled with pressurized gas and has an upper chamber 160A formed on the upper side of the piston 170 and a lower chamber 160B formed on the lower side of the piston 170 and communicated with the upper chamber 160A. The upper chamber 160A and the lower chamber 160B communicate with each other via a gas flow passage of the valve mechanism 20, and the gas flow passage is communicated or blocked depending on the operating position of the spool valve 144.

  The piston 170 partitions the inside of the cylinder 160 into an upper chamber 160A and a lower chamber 160B, and a piston rod 180 is coupled to the center of the piston 170. Therefore, the piston rod 180 is provided so as to be movable in the axial direction (vertical direction) together with the piston 170.

  When the plunger 140 is pressed by the operation lever 150 in the seated state and the spool valve 144 is displaced downward to open the gas flow passage, the upper chamber 160A and the lower chamber 160B of the cylinder 160 are switched to the communication state. The piston 170 is pushed down by the gas pressure due to the difference in pressure receiving area between the upper surface and the lower surface. Thereby, the piston rod 180 is pushed out below the cylinder 160, and the height position of the seat part 14 can be raised.

  FIG. 2A is a side view showing an initial position of the rotation position return mechanism of the gas spring device. FIG. 2B is a longitudinal sectional view showing an initial position of the rotation position return mechanism of the gas spring device along the line AA in FIG. 2A. FIG. 2C is a bottom view showing the rotation position return mechanism of the gas spring device. 2A to 2C, the spring member 100, the thrust bearing 120, and the wave washer 122 are omitted.

  As shown in FIGS. 2A to 2C, the guide member 70 has a cylindrical lower portion, and an elevating member 80 and a rotating member 90 are coaxially arranged inside. The elevating member 80 has a pair of convex portions 82 and 83 that engage with the concave portions 72 and 73 for rotation prevention provided on the outer peripheral side of the cylindrical portion of the guide member 70. The recesses 72 and 73 for rotation prevention and the protrusions 82 and 83 are provided at intervals of 180 degrees in the circumferential direction, guide the lifting operation in the axial direction, and restrict the rotation of the lifting member 80 in the circumferential direction. It is a regulating member.

  The rotating member 90 is provided so as to be rotatable around the axis inside the cylindrical portion of the guide member 70, and the lifting operation is restricted so as not to move in the axial direction. The guide member 70, the elevating member 80, and the rotating member 90 have through holes 74, 84, and 94 through which the outer cylinder 60 is inserted, respectively, in the axial direction.

  FIG. 3A is a side view showing a turning state of the turning position return mechanism. 3B is a longitudinal sectional view taken along line BB in FIG. 3A.

  As shown in FIGS. 3A and 3B, when the seat 14 coupled to the upper end of the outer cylinder 60 is rotated around the axis while being seated, the rotating member 90 rotates with the outer cylinder 60, The raising / lowering member 80, which is restricted by the rotation of the rotation member 90, moves downward in the axial direction against the spring force of the spring member 100.

  In the seated state, the weight acts on the outer cylinder 60 via the seat portion 14, and the rotating member 90 fitted to the outer periphery of the outer cylinder 60 also rotates in the same direction as the seat portion 14. ing. And the raising / lowering member 80 descend | falls below and compresses the spring member 100 because the inclined surface of the rotation member 90 acts as a cam surface. Therefore, the spring force of the spring member 100 is increased, and the elevating member 80 is more strongly biased upward.

  When the seat portion 14 is in the initial position, the inclined surface 91 of the rotating member 90 is in a position where the inclined surface 81 of the elevating member 80 coincides with the inclined direction and faces the entire inclined surface 81 (see FIG. 2B). . Further, in a state where the seat portion 14 is rotated, the inclined surface 91 of the rotating member 90 is rotated relative to the inclined surface 81 of the elevating member 80, and a part of the inclined surface 91 is changed to the inclined surface 81. In contact.

  In the seated state in which the weight is applied to the seat portion 14 as described above, the weight is applied to the upper end of the outer cylinder 60, so that the load on the rotating member 90 is increased and the spring force of the spring member 100 is increased. The rotating member 90 cannot be returned to the initial position. When the seat 14 is left with the seat 14 rotated, the weight acting on the seat 14 is removed, and the load acting on the turning member 90 is reduced. The inclined surface 91 of the rotating member 90 is rotated in a direction coinciding with the inclined surface 81 of the elevating member 80 by the spring force of the spring member 100 that performs.

  Here, the structure of the guide member 70, the raising / lowering member 80, and the rotation member 90 is demonstrated in detail.

  FIG. 4A is a side view showing a guide member of the rotation position return mechanism. 4B is a longitudinal sectional view taken along line CC in FIG. 4A. FIG. 4C is a bottom view showing the guide member of the rotation position return mechanism.

  As shown in FIGS. 4A to 4C, the guide member 70 has an insertion hole 74 through which the outer cylinder 60 is inserted in the center of the upper part of the cylindrical shape in the axial direction. A storage recess 75 for storing the member 90 is formed. Further, in the cylindrical wall portion 76 formed so as to surround the housing concave portion 75, the above-described concave portions for rotation 72 and 73 are formed to extend upward from the lower end.

  The locking recesses 72 and 73 include linear portions 72a and 73a formed to extend in the axial direction, and tapered portions 72b and 73b whose width in the circumferential direction becomes narrower toward the upper position. In addition, the inclination angles θ of the wall surfaces formed on both sides of the taper portions 72b and 73b with respect to the axis are formed at the same angle and are bilaterally symmetric.

  The guide member 70 is attached without worrying about the positions of the rotation-stopping recesses 72 and 73 because the rotation-stopping recesses 72 and 73 formed in the same shape are provided at intervals of 180 degrees in the circumferential direction. be able to.

  FIG. 5A is a front view showing an elevating member of the rotation position return mechanism. FIG. 5B is a rear view showing the elevating member of the rotation position return mechanism. FIG. 5C is a plan view showing a sliding member of the rotational position return mechanism. FIG. 5D is a longitudinal sectional view taken along line DD in FIG. 5A.

  As shown in FIGS. 5A to 5D, an inclined surface 81 that faces the inclined surface 91 of the rotating member 90 is formed on the upper surface of the elevating member 80. Further, on the outer peripheral side of the elevating member 80, first and second convex portions 82 and 83 that engage with the rotation-preventing concave portions 72 and 73 of the guide member 70 are provided.

  The inclined surface 81 is formed such that the protruding side of one first convex portion 82 is the lowest lowest position PA and the protruding side of the other second convex portion 83 is the highest highest position PB. When viewed from above, the pair of inclined surfaces 81 are arranged symmetrically between the lowest position PA and the highest position PB.

  One first convex portion 82 is formed in a square shape when viewed from the side, and has a width slightly smaller than the circumferential groove width of the straight portions 72a and 73a of the concave portions 72 and 73 for rotation prevention. Yes. The other second convex portion 83 includes a straight portion 83a having both side surfaces extending in the axial direction and a tapered portion 83b having both side surfaces inclined with respect to the axial direction. The inclination angle α with respect to the axis of the taper portion 83b is set to be substantially the same as the inclination angle θ of the taper portions 72b and 73b of the anti-rotation concave portions 72 and 73 (θ≈α).

  In the present embodiment, the first convex portion 82 and the second convex portion 83 are formed in different shapes. However, the first convex portion 82 has a tapered portion as in the second convex portion 83. It is good also as a shape.

  When the seat portion 14 is rotated to leave the seat, the highest position PB of the inclined surface 81 presses the inclined surface 91 of the rotating member 90 while the elevating member 80 is raised by the spring force of the spring member 100. The moving member 90 is rotated to return the seat portion 14 to the initial position. In the operation process, the first and second convex portions 82 and 83 of the elevating member 80 move upward along the anti-rotation concave portions 72 and 73 of the guide member 70, and therefore the tapered portion 83 b of the second convex portion 83. Is engaged with the tapered portion 73 b of the rotation-preventing recess 73, so that the axial and circumferential movements of the cylinder mechanism 130 that supports the seat portion 14 are restrained.

  Thus, the guide member 70 and the elevating member 80 fixed to the support member 40 are fitted in a state where the taper portion 83b of the second convex portion 83 and the taper portion 73b of the concave portion 73 for rotation prevention are not rattling. By doing so, it becomes possible to suppress rattling of the outer cylinder 60 that supports the seat portion 14. Therefore, when the seat portion 14 returns to the initial position, the taper portion 83b of the second convex portion 83 moves in the axial direction and engages with the taper portion 73b of the concave portion for rotation 73, thereby Positioning the stop position of the seat portion 14 in the circumferential direction at a predetermined position when the seat portion 14 is returned to the initial position without any shakiness between the guide member 70 and the axial direction and the circumferential direction. Can do.

  Therefore, the deviation of the initial position of the seat portion 14 due to the rattling between the outer cylinder 60 that supports the seat portion 14 and the rotating member 90 is eliminated, and when the seat portion 14 is turned away, It is possible to accurately return the seat portion 14 to a predetermined initial position. Further, on the inner peripheral side of the guide member 70 by the wave washer 122, axial force can be applied to the thrust bearing 120, the rotating member 90, and the elevating member 80, and play between them can be suppressed. The deviation of the initial position of the part 14 is eliminated.

  The elevating member 80 has an insertion hole 84 penetrating in the axial direction on the inner periphery of the cylindrical shape. The outer cylinder 60 is inserted into the insertion hole 84 and is provided so as to be movable only in the axial direction (up and down direction) with respect to the outer cylinder 60. Furthermore, a spring receiving recess 85 with which the upper end of the spring member 100 abuts is formed at the bottom of the elevating member 80.

  FIG. 6A is a plan view showing a rotation member of the rotation position return mechanism. 6B is a longitudinal sectional view taken along line EE in FIG. 6A. 6C is a longitudinal sectional view taken along line FF in FIG. 6A.

  As shown in FIGS. 6A to 6C, the rotating member 90 has an inclined surface 91 formed on a cylindrical upper surface. The inclined surface 91 is disposed symmetrically between the lowest position PA and the highest position PB, similarly to the inclined surface 81 of the elevating member 80 described above. Further, the inclination angle of the inclined surface 91 with respect to the horizontal direction (or the axial direction) is formed to be substantially the same as the inclination angle of the inclined surface 81 of the elevating member 81.

  The insertion hole 94 of the rotating member 90 is formed in an oval shape corresponding to the outer peripheral shape of the outer cylinder 60 when viewed from the axial direction, and the outer cylinder 60 of the cylinder mechanism 130 is formed on a flat portion on the inner peripheral side. A cylinder clamping mechanism 190 for clamping is provided. The cylinder clamping mechanism 190 includes a pair of variable engagement members 200 and a pair of leaf springs 210.

  The variable engagement member 200 has an L-shaped longitudinal cross-section and corresponds to the dimensional shape of the mounting hole 95. That is, the variable engagement member 200 includes a protrusion 202 that protrudes from the inner peripheral opening 93 into the insertion hole 94 and a stopper portion 204 that extends downward from the protrusion 202 so as to face the side wall of the bottom opening 92. . The variable engagement member 200 is pressed to the inner peripheral side by a leaf spring 210 inserted into the bottom opening 92 of the rotating member 90.

  Furthermore, the inner wall of the insertion hole 94 of the rotation member 90 is provided with an inner peripheral opening 93 for the protrusion 202 of the variable engagement member 200 to protrude inward. The inner peripheral opening 93 and the bottom opening 92 are communicated with each other through an L-shaped attachment hole 95. A variable engagement member 200 and a leaf spring 210 are inserted into the attachment hole 95.

  Therefore, when the outer cylinder 60 of the cylinder mechanism 130 is inserted into the insertion hole 94 of the rotating member 90, the protrusion 202 of the variable engagement member 200 comes into contact with the outer periphery of the outer cylinder 60. In addition, the outer peripheral shape of the outer cylinder 60 is a polygon, and the gap between the rotating member 90 and the outer cylinder 60 of the cylinder 130 is further increased by making the position where the protrusion 202 of the variable engagement member 200 abuts a flat surface. Can be suppressed. As a result, the protrusion 202 of the variable engagement member 200 is displaced outward, compresses the leaf spring 210, and increases the spring force of the leaf spring 210. The spring force of the leaf spring 210 acts simultaneously from the direction of 180 degrees on the outer periphery of the outer cylinder 60 via the protrusion 202 of the variable engagement member 200.

  As a result, the outer cylinder 60 is held in a stable state without rattling with respect to the rotating member 90. Therefore, it is possible to suppress the shift of the return position of the seat portion 14 when the seat portion 14 is returned to the initial position by eliminating the backlash due to the gap between the rotating member 90 and the outer cylinder 60 of the cylinder mechanism 130. it can. Therefore, the deviation of the initial position of the seat portion 14 due to the rattling between the outer cylinder 60 that supports the seat portion 14 and the rotating member 90 is eliminated, and when the seat portion 14 is turned away, It is possible to accurately return the seat portion 14 to a predetermined initial position.

  Note that the clamping mechanism 190 only needs to be configured to clamp the outer periphery of the outer cylinder 60 at least at two or more locations. For example, the variable engagement member 200 and the leaf spring 210 may be arranged at three or four locations. . Moreover, you may use the elastic member (for example, rubber member) which presses the variable engagement member 200 inside instead of the leaf | plate spring 210. FIG.

DESCRIPTION OF SYMBOLS 10 Gas spring apparatus 12 Chair 14 Seat part 20 Valve mechanism 30 Rotation position return mechanism 40 Supporting cylinder 60 Outer cylinder 70 Guide member 72, 73 Recessed recessed part 72a, 73a, 83a Linear part 72b, 73b, 83b Taper part 74 84, 94 Insertion hole 75 Storage recess 80 Lifting member 81, 91 Inclined surface 90 Rotating member 100 Spring member 120 Thrust bearing 130 Cylinder mechanism 140 Plunger 144 Spool valve 150 Operation lever 160 Cylinder 160A Upper chamber 160B Lower chamber 170 Piston 180 Piston Rod 190 Cylinder clamping mechanism 200 Variable engagement member 210 Leaf spring 202 Projection 204 Stopper

Claims (2)

A support cylinder;
A cylinder that is inserted into the support cylinder, has one end projecting outward from the support cylinder in the axial direction, and is provided so as to be rotatable about an axis with respect to the support cylinder;
A piston slidably inserted into the cylinder;
A cylinder mechanism including one end connected to the piston, the other end extending from the other end side of the cylinder, and a rod fixed to the other end side of the support cylinder;
A rotation position return mechanism that is provided between the support cylinder and the cylinder mechanism and returns to a reference position with respect to rotation of the cylinder mechanism with respect to the support cylinder;
In the gas spring device for a chair in which a seat is attached to one end of the cylinder mechanism,
The rotational position return mechanism is
An outer periphery is fixedly provided in the support cylinder, and a guide member into which the cylinder is inserted into the inner periphery ;
Housed in the guide member is engaged with the outer periphery of the cylinder da, a rotating member inclined surface on one side in the axial direction is formed to be rotated in accordance with the axis of rotation of the cylinder,
An inclined surface that contacts and separates from the inclined surface of the rotating member is formed on one side, the rotation is restricted by the rotation restricting member with respect to the guide member, and the cylinder is inserted and only in the axial direction. A movable lifting member;
The support cylinder is provided in the body, and a spring member for biasing the lifting member in the direction in which the inclined surface abuts the inclined surface and the rotating member of the elevating member,
The rotation restricting member is
Consists of a convex portion provided integrally with the lifting member, and a concave portion provided in the guide member corresponding to the convex portion,
The gas spring device according to claim 1, wherein the convex portion and the concave portion are formed in a tapered shape whose width in the circumferential direction becomes narrower as the rotating member and the elevating member move in a contact direction. 2. The gas spring device according to claim 1, wherein a clamping mechanism that clamps at least two locations that clamp the outer periphery of the cylinder mechanism is provided on an inner peripheral side of the rotating member.

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