A gas spring device includes a gas spring which generates a force proportional to a differential pressure between an inner space pressure and an atmospheric pressure, a suction/discharge part which can adjust a gas amount in the gas spring inner space, a rotary body which is connected to the gas spr
A gas spring device includes a gas spring which generates a force proportional to a differential pressure between an inner space pressure and an atmospheric pressure, a suction/discharge part which can adjust a gas amount in the gas spring inner space, a rotary body which is connected to the gas spring, to which a torque due to the force generated by the spring is applied, a displacement part which is connected to the rotary body, and is displaced in conjunction with a rotary body rotary movement, a speed change part which is arranged in one of or both of between the rotary body and the displacement part and between the gas spring and the rotary body, and a torque compensating part which sets the torque applied to the rotary body to substantially 0 when the inner space gas amount of the gas spring is at a predetermined value.
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1. A gas spring device comprising: a gas spring that is fixed to a frame, and generates a force proportional to a differential pressure between a pressure in an inner space and an atmospheric pressure;a suction/discharge part that is arranged in the gas spring, and is capable of adjusting an amount
1. A gas spring device comprising: a gas spring that is fixed to a frame, and generates a force proportional to a differential pressure between a pressure in an inner space and an atmospheric pressure;a suction/discharge part that is arranged in the gas spring, and is capable of adjusting an amount of gas in the inner space of the gas spring;a rotary body that is rotatably arranged in the frame and connected to the gas spring, to which a first torque due to the force generated by the gas spring is applied;a displacement part that is connected to the rotary body, and is displaced in conjunction with a rotary movement of the rotary body;a speed change part that is arranged in the frame, and configured to perform one or both of conversion between a sum of the first torque and a second torque applied to the rotary body and a force applied to the displacement part by being arranged between the rotary body and the displacement part, and conversion between the generating force of the gas spring and the first torque applied to the rotary body by being arranged between the gas spring and the rotary body; anda torque compensating part that is arranged in the frame and connected to the rotary body, and applies the second torque to the rotary body, and sets the sum of the first torque and the second torque applied to the rotary body to substantially 0 when the amount of the gas in the inner space of the gas spring is at a predetermined value. 2. The gas spring device according to claim 1, wherein the torque compensating part sets the second torque applied to the rotary body to substantially 0 when the amount of the gas in the inner space of the gas spring is an amount of the gas which brings an inner pressure to the atmospheric pressure when a volume of the inner space is set to a maximum value. 3. The gas spring device according to claim 1, wherein the torque compensating part comprises: an elastic body that is arranged in the frame;a first flexible coupling member that is connected to the elastic body, to which a tension generated by a generating force of the elastic body is applied;a first non-true-circular disk that is rotatably arranged in the frame, around which the first flexible coupling member is wound; anda first transmitting part that is rotatably arranged in the frame, and transmits to the rotary body a third torque applied to the first non-true-circular disk by the tension of the first flexible coupling member. 4. The gas spring device according to claim 3, wherein the first non-true-circular disk is configured by a rotatable plate-shaped member having a curved side surface formed of a group of a plurality of arcs each having a different radius of curvature, and the first flexible coupling member makes contact with and is wound around the curved side surface due to rotation of the plate-shaped member. 5. The gas spring device according to claim 4, wherein the first non-true-circular disk is a member having a shape in which a distance Rc from a center of a rotary axis of the rotary body to a center of a thickness of the first flexible coupling member is set to Rc=2Tc/Fc when a rotational angle of the rotary body is θ, Tcis the second torque which the torque compensating part applies to the rotary body at the rotational angle θ, and Fc is a force which is generated by the elastic body. 6. The gas spring device according to claim 1, wherein the speed change part that is arranged between the rotary body and the displacement part, comprises:a second non-true-circular disk that is connected to the rotary body and rotates in conjunction with the rotary body; anda second flexible coupling member that has one end thereof wound around the second non-true-circular disk and an other end thereof connected to the displacement part. 7. The gas spring device according to claim 6, wherein the second non-true-circular disk is configured by a rotatable plate-shaped member having a curved side surface formed of a group of a plurality of arcs each having a different radius of curvature, and the second flexible coupling member makes contact with is wound around the curved side surface due to rotation of the plate-shaped member. 8. The gas spring device according to claim 7, wherein the gas spring is configured by a cylinder and a piston which moves inside the cylinder, andthe second non- true-circular disk is a member formed in a shape in which a distance R from a center of a rotary axis of the rotary body to a center of a thickness of the second flexible coupling member is set to R=R0/(1−Raθ/(2L)) when a rotational angle of the rotary body is θ, R0 is a distance from the center of the rotary axis of the rotary body to the center of the thickness of the second flexible coupling member when the rotational angle θ=0, Ra is a radius of the rotary body, and L is a length of the inner space where the piston moves in the cylinder. 9. The gas spring device according to claim 1, wherein the speed change part arranged between the gas spring and the rotary body, comprises:a third flexible coupling member that is connected to the gas spring, to which a tension due to the force generated by the gas spring is applied;a third non-true-circular disk that is rotatably arranged in the frame, around which the third flexible coupling member is wound; anda second transmitting part that transmits to the rotary body a fourth torque applied to the third non-true-circular disk by tension of the third flexible coupling member. 10. The gas spring device according to claim 1, wherein a force or a fifth torque taken out from the displacement part is constant regardless of a displacement or an angular displacement. 11. The gas spring device according to claim 1, wherein a force or a fifth torque taken out from the displacement part changes linearly with respect to a displacement or an angular displacement. 12. A composite gas spring device comprising: a plurality of the gas spring devices according to claim 1 having different characteristics, whereinthe displacement part, and the speed change part arranged between the displacement part and the rotary body in the respective gas spring devices are shared by the plurality of gas spring devices. 13. A balancer device comprising: the gas spring device according to claim 1; anda holding part that supports an own weight of an object connected to the displacement part of the gas spring device. 14. A gas pressure actuator comprising: the gas spring device according to claim 1; anda control device that is connected to the suction/discharge part of the gas spring device, and changes a generating force of the gas spring device by controlling the pressure in the inner space of the gas spring. 15. A bias load compensating actuator comprising: the gas spring device according to claim 1; andan actuator that applies a force to the displacement part of the gas spring device in parallel.
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Rosman Alan H. (Woodland Hills CA), Hydraulically operated hoist for containerized freight or the like.
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