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A clamp device having a body made of a pair of half bodies connected and unified with a fixation member. One of friction plate units is elastically pushed by a first spring in a direction parting from a disc and in a rotating direction of the disc simultaneously, and the other of the friction plate

A clamp device having a body made of a pair of half bodies connected and unified with a fixation member. One of friction plate units is elastically pushed by a first spring in a direction parting from a disc and in a rotating direction of the disc simultaneously, and the other of the friction plate units is elastically pushed by a second spring in a direction parting from the disc and in a reverse direction of the rotating direction simultaneously.

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1. A clamp device for a disc comprising a pair of friction plate units pressed to both sides of the disc by a pair of fluid pressure pistons enclosed in the body to stop rotation of the disc, a pair of half bodies connected and unified with a fixation member, a first spring which elastically pu

1. A clamp device for a disc comprising a pair of friction plate units pressed to both sides of the disc by a pair of fluid pressure pistons enclosed in the body to stop rotation of the disc, a pair of half bodies connected and unified with a fixation member, a first spring which elastically pushes one of the friction plate units in a parting direction from the disc and in a rotation direction of the disc simultaneously, and a second spring which elastically pushes the other of the friction plate units in a parting direction from the disc and in an opposite direction to the rotation direction of the disc simultaneously; wherein the first spring and the second spring are substantially identical in configuration; and wherein the configuration of the first spring and the second spring is asymmetrical. 2. The clamp device as set forth in claim 1, wherein the first spring and the second spring are each held by a respective concave groove formed on each of mating faces of the half bodies, upper sides of the first spring and the second spring are U-shaped and are inserted into the concave grooves, the pair of half bodies are connected and unified with the fixation member, and left and right leg portions of the first spring are hitched to one of the friction plate units and left and right leg portions of the second spring are hitched to the other of the friction plate units. 3. A clamp device for a disc comprising a pair of half bodies connected and unified with a fixation member, a pair of friction plate units pressed to both sides of the disc by a pair of fluid pressure pistons enclosed in the body to stop rotation of the disc, an elastic member comprising a first spring and a second spring, each one of the first and the second spring elastically pushes the pair of friction plate units in directions parting each other and in directions along and opposite to a rotation of the disc simultaneously; wherein each one of the first spring and the second spring in a free state is asymmetrical a plane lying within the disc. 4. The clamp device as set forth in claim 3, wherein the elastic member comprises a U-shaped first spring and a U-shaped second spring, one pair of concave grooves is formed on faces corresponding to a periphery of the disc in a concave portion formed in the body to which the periphery of the disc is inserted, upper sides of the first spring and the second spring are inserted into the concave grooves, left and right leg portions of the first spring are hitched to the pair of the friction plate units, and left and right leg portions of the second spring are hitched to the pair of the friction plate units.