Patent ID: 7252464
Filing Date: 2007-08-07
Classification: B23B,B23Q,Y10T

Abstract:
1. A hydraulic stop for use in drilling or countersinking operations comprising a rotatable body for rotating a tool about its axis; and a cage adapted to contact the surface of a workpiece when the tool has penetrated into the workpiece by a predetermined distance, and to actuate a trip mechanism comprising a plunger operated hydraulic valve as the tool penetrates the workpiece by more than the predetermined distance; wherein the trip mechanism is effective, when actuated, to allow the rotatable body to reduce in length parallel to the rotating axis of the tool; the plunger has an adjustable length; the cage is axially adjustable in relation to the body to set the predetermined distance at which the trip mechanism actuates; and a plurality of holes which are spaced around the circumference of the body allow drainage of coolant from the cage whatever its axial position.