US 4,577,847 AGranted

Clamping device

OwnerSven-Erik Schedwininventor

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Abstract

The invention relates to a clamping device, especially for clamping work tables, fixtures etc. to a base such as the machine table in a machine tool, comprising a holding means (2) having an enlarged head (4) and clamping means (8) which in the clamping position engage the head (4) of the holding means (2) and a clamping mechanism (7) which in its normal condition acts with its full clamping force against the clamping means but which unloads the clamping means when a disengagement force is applied thereto. In accordance with the invention the clamping means consist of clamping hooks (7) which are pivotable between a clamping position, in which they engage the head (4) of the holding means (2), and a disengagement position, in which they completely disengage the head of the holding means, during simultaneous movement thereof in a direction opposite the clamping direction, and reverse.

In a clamping device for clamping such apparatus as worktables and fixtures on a base, such as on the machine table of a machine tool, said clamping device including a holding means (2) having an enlarged head (4) and being secured to either of said apparatus or said base, and a housing (9) being secured to the other of said apparatus or said base, said housing (9) having a central opening (14), a clamping mechanism (7) received in said central opening (14) and carrying clamping means (8) comprising clamping hooks pivotal between a clamping position for engaging head (4) of said holding means (2) and a disengagement position for completely disengaging said head of said holding means, the improvement comprising clamping means (7) for clamping and unclamping said clamping hooks so that in a normal condition said clamping means acts with its full clamping force against said clamping hooks and in a disengaging condition said clamping means unloads said clamping hooks when a disengagement force is applied thereto, said clamping means (7) comprising a mechanical clamping force means (18) for acting between a collar (19) positioned at the inner wall of housing (9) and a piston (15) sealingly engaging said inner wall of housing (9) and having a piston rod (17) having an end extending from a first side of said piston and facing said holding means (2), said end carrying the clamping hooks (8);

said piston (15) being constantly acted upon by said clamping force means (18) for urging piston 15 and thereby piston rod (17) and said clamping hooks in a direction away from holding means (2) but being urged in the opposite direction when said disengagement force, counteracting and exceeding said clamping force, is applied to a second side of piston (15) opposite said first side to which said piston rod is connected;
and, said clamping hooks (8) being slidable in central opening (14) of housing (9) and engaging a guide surface (24) provided on said inner wall of housing (9) for swinging movement of said clamping hooks towards the clamping position during movement of said clamping hooks in the clamping direction and for preventing movement from the clamping position during clamping.

Abstract

Claims6