Tool chuck for a drill press
OwnerTony Petkovichinventor
Life of this patent
Estimating the term…
Abstract
A chuck for holding a tool in a drill press includes a sleeve having an open end spaced above a workpiece to be drilled. A plurality of levers are pivotally mounted in the sleeve and the lower ends of the levers are fitted with jaws which grip the side of the tool shank entered into the sleeve. The innermost end of the tool abuts a cam member which is endwise movable in the sleeve. Springs are provided to hold inner ends of the levers in engagement with the cam member and to lightly hold the jaws against the tool shank. When the rotating tool is applied to the workpiece, the cam member is moved inwardly of the sleeve and the levers are rocked to increase the grip of the jaws upon the tool shank.
Claims6
A tool chuck for a machine having a rotatable driven part, comprising a sleeve having an open end and an opposite end connectable to said machine part, a plurality of levers circumferentially spaced apart around the open end;
- said levers each having an outer end, an inner end, and an intermediate portion, pivot means connecting the intermediate portions to the sleeve whereby the outer ends are swingable towards and away from an axis of rotation of said sleeve, an axially movable cam member supported within the sleeve, spring means urging the inner ends into engagement with the cam member, said outer ends being moved radially with respect to the open end in response to axial movement of said cam member, said cam member being shaped to move the outer ends of the levers inwardly when said cam member is moved axially in a direction away from the open end of the sleeve and to move said outer ends outwardly in cooperation with the spring means when said cam member is moved in the opposite direction, and said cam member having an end face adapted to be abutted by a tool inserted between and initially slidably held by the outer ends, whereby said tool when applied to a workpiece by axial movement of the driven part of the machine sliding between the outer ends moves the cam member axially away from the open end so that the outer ends are swung radially inwards into rotational driving engagement with the tool.
A tool chuck for a machine having a rotatable driven part, comprising a sleeve having an open end and an opposite end, a shank on the opposite end adapted to be connected to the machine part, a plurality of levers circumferentially spaced apart around the open end;
- said levers each having an outer end, an inner end, and an intermediate portion;
- pivot means connecting the intermediate portions to the sleeve whereby the outer ends are swingable towards and away from an axis of rotation of said sleeve, a toolgripping jaw on the outer end of each lever, an axially movable cam member supported within the sleeve, said cam member having a stem, said shank having a bore in which the stem is slidably mounted and is endwise movable, a compression spring mounted within the sleeve to bias the cam member away from the open end, a plate within the sleeve, said plunger having an opening through which the stem freely projects, a leaf spring carried by the plate to engage an adjacent inner end of each lever, a collar mounted exteriorly of the sleeve and operatively connected to the plate, and said cam member having an end face adapted to be abutted by a tool inserted between and gripped by the jaws whereby, when said machine part is moved axially to apply the tool to a workpiece, an oppositely directed force is applied to move the cam member away from the open end thereby increasing the gripping action of the jaws on the tool.
Dependencies are inferred from the claim text.