초록

A weight machine is used for acceleration movement of heavy weights, and jumping and throwing exercises. The weight machine includes a hydraulic cylinder that will retard movement of the weight under gravity, and will permit free movement against the force of gravity.

대표청구항 ▼

What is claimed is: 1. A weight throwing machine comprising a frame, a weight support pivotally mounted on said frame, a handle for grasping for throwing the weight upwardly, and a reaction actuator connected between the frame and the pivoting weight support, said reaction actuator comprising a flu

What is claimed is: 1. A weight throwing machine comprising a frame, a weight support pivotally mounted on said frame, a handle for grasping for throwing the weight upwardly, and a reaction actuator connected between the frame and the pivoting weight support, said reaction actuator comprising a fluid pressure cylinder and piston having a check valve which permits substantially free flow from one side of the piston to a second side of the piston during upward throwing movement of the weight support, and an internal passageway in the fluid pressure cylinder including a restriction to control the flow from a second side of the piston to the one side when the weight support is released, to slow a rate of falling of the weight support under gravity, wherein said fluid pressure cylinder comprises a hydraulic actuator having a pair of concentric cylinders, an inner cylinder slidably mounting the piston and an outwardly extending rod attached to the piston, an annular space defined between the inner cylinder and an outer cylinder of the concentric cylinders, and an opening between the inner cylinder and outer cylinder on the second side of the piston, adjacent an outer end of the fluid pressure cylinder, said restriction comprising a passageway in a base end of the outer cylinder opposite from the outer end of the fluid pressure cylinder from which the rod extends and forming a flow passage between the annular space and the one side of the piston. 2. The weight machine of claim 1, wherein said weight support is pivotally mounted to said frame at a first level adjacent a supporting surface, and an operator lift bar pivotally mounted to the frame and spaced vertically above the weight support, the handle being connected to the lift bar, and a link connecting the lift bar and the lift support, whereby when the lift bar is moved, the weight support is also moved. 3. The machine of claim 1, wherein said handle comprises an elongated handle pivotally mounted to the frame about an axis parallel to and spaced from the pivotal mounting of the weight support, said handle extending outwardly over a weight on the weight support, and a link between the handle and the weight support such that when the handle is moved about its pivot, the weight support moves about its pivot in the same direction. 4. The machine of claim 3, wherein said restriction comprises an adjustable orifice in the flow passage between the second side of the piston and the one side of the piston. 5. The machine of claim 1, wherein said restriction comprises an adjustable member that controls the size of an orifice through which fluid flows from the second side of the piston to the one side of the piston. 6. The machine of claim 5, wherein the adjustable member comprises a manually adjustable valve that moves a valve member relative to a valve seat surrounding the orifice. 7. A weight throwing machine comprising a frame, a weight support pivotally mounted on said frame, a handle for grasping for throwing the weight upwardly, and a reaction actuator connected between the frame and the pivoting weight support, said reaction actuator comprising a fluid pressure cylinder and piston having a check valve which permits substantially free flow from one side of the piston to a second side of the piston during upward throwing movement of the weight support, and an internal passageway in the fluid pressure cylinder including a restriction to control the flow from a second side of the piston to the one side when the weight support is released, to slow a rate of falling of the weight support under gravity, said check valve comprising a valve plate on the second side of the piston, the piston having a passageway that is closed by the valve plate under a spring load, but which opens when the pressure on the one side of the piston exceeds a selected amount to move the valve plate away from the second side of the piston. 8. The machine of claim 7, wherein the spring load is provided with a conical spring. 9. The machine of claim 7, wherein said fluid pressure cylinder has a block at the base end thereof, the block having a recess that faces the piston, and connects the passageway in the piston to a passageway forming the portion of the restriction.