Patent ID: 8256069

Claim:
A link type clamping apparatus comprising: a rod vertically movably inserted into a housing; a clamp arm having one end portion in a longitudinal direction, the one end portion being vertically swingably connected to an upper portion of the rod; a support member provided at an outer periphery of an upper portion of the housing; an annular supported member attached to the support member so as to rotate around an axis; a link member having a link lower portion and a link upper portion, the link lower portion being swingably connected to a pivot portion provided to the supported member, and the link upper portion being swingably connected to a non-edge portion in a longitudinal direction of the clamp arm; a receive means which receives an upward force acting from the link member on the pivot portion during a clamping operation, and is provided to the support member and the supported member; and a lock means for fixing the supported member to the support member at a desired rotation angle position around the axis, wherein the receive means includes: at least one male screw region formed on an outer periphery of the support member of the housing; and at least one female screw region formed on an inner periphery of the supported member so as to vertically movably screw onto the male screw region, wherein the outer periphery of the support member of the housing is provided with at least one outer periphery fitting region having a vertically straight outer peripheral surface and the male screw region, in a vertical direction, and wherein the inner periphery of the supported member is provided with at least one inner periphery fitting region having a vertically straight inner peripheral surface which fits to the outer periphery fitting region and the female screw region, in a vertical direction.