Adaptor for countersinking device

Claim 1

An adapter for a countersinking device comprising first and second plates disposed in generally parallel relationship to each other and being relatively movable in a direction generally normal to said plates, said first plate carrying a countersinking tool, said second plate being disposed below said first plate and having aperture means in alignment with said countersinking tool, means normally urging said plates toward a relative position of maximum spacing therebetween, said urging means including two pair of sleeves with a first end portion of a first sleeve of each pair of sleeves being in telescopic relationship with a first end portion of a second sleeve of each pair of sleeves, a second end portion of each first sleeve being connected to said second plate, said first end portions of said second sleeves being connected to said first plate, a spring housed within each pair of sleeves urging the plates toward the position of maximum spacing therebetween, adjustable stop means for limiting the relative movement of said plates toward both said positions of minimum and maximum spacing, said adjustable stop means being defined by a pair of threaded pins each carrying two pair of nuts, each threaded pin being connected to one of said plates and passing freely through an opening of another of said plates, a first pair of said nuts being disposed between said plates and a second pair of said nuts being disposed above said first plate, said aperture means having an axis, and an imaginary line passing through said pins being offset from the axis of said aperture means.