Power drawbar wrench
AssigneeKurt Manufacturing Company, Inc.
InventorJohn O. Lenz
Life of this patent
Estimating the term…
Abstract
A power operated wrench for acuating the drawbars on machine tools, such as vertical spindle milling machines, which permits the operator to move a single handle, and after release of a safety interlock move a pneumatic wrench into position to engage the drawbar nut and either tighten or loosen the drawbar depending on the direction of motion of the operator handle. The mechanical operation permits the operator to rotate the operator handle in the same direction as would be done if the drawbar was being manually tightened or loosened, in order to tighten or loosen the drawbar under power. The safety interlock prevents movement of the power motor into engagement with the drawbar until the machine has been shut off.
Claims15
A drawbar operating wrench for mounting onto a machine tool and for centrally tightening of the drawbar thereof, which drawbar has one end which protrudes from the machine tool and is adapted to be rotated, said drawbar operating wrench comprising:
- a mounting block adapted for being mounted on the machine tool adjacent the one end of the drawbar;
- an actuator member mounted on the mounting block for rotational movement centered on the axis of said drawbar;
- a motor slideably mounted relative to said block and being guided for movement generally parallel to the axis of the drawbar, said motor being moveable between first and second positions, said motor in its second position operatively engaging said drawbar for rotating said drawbar and in the first position clearing said drawbar;
- means operatively connecting said motor and said actuator member so that upon movement of said actuator member the motor is moved in a selected direction from a reference position and is moved toward its second position and thus toward said drawbar;
- interlock means coupled to said actuator member to prevent movement of said actuator member when the machine tool is powered;
- and
- means coupled to said actuator member for energizing the motor after the actuator member has moved the motor to its second position engaging said drawbar.
An attachment for a machine tool having a drawbar with at least one end of the drawbar adjacent a portion of the machine tool and positioned for rotation to tighten and loosen the drawbar, comprising;
- a first support adapted to be mounted to said machine tool in position adjacent the one portion of a drawbar on the machine tool on which the first support is mounted;
- a motor support having means for mounting a motor thereon;
- means to slideably guide said motor support on said first support for movement toward and away from a drawbar on a machine tool on which the first support is mounted;
- and
- actuator means rotatably mounted on the first support and coupled to said motor support for moving said motor support toward said drawbar to engage a motor mounted on the motor support with a drawbar on a machine tool on which the first support is mounted, and including means for operating a motor mounted on the motor support when the motor support has been moved to a second position adjacent such a drawbar upon movement of said actuator means.
An attachment for a machine tool having a drawbar with at least one end of the drawbar adjacent a portion of such machine tool and positioned for rotation to tighten and loosen such drawbar, comprising:
- first means for mounting on a machine tool adjacent an end of a drawbar;
- power actuator means operable for rotatably driving a drawbar on such machine tool to tighten or loosen such drawbar;
- means for guiding the power actuator means between first and second positions engaged with and disengaged from such drawbar, respectively;
- second manual actuator means movably mounted on an axis on the first means and coupled to the power actuator means to cause movement of the power actuator means between its first and second positions where the second manual actuator means is moved about its axis in either direction;
- and
- means responsive to movement of the second manual actuator means to cause the power actuator means to be rotated in the same direction of rotation as the movement direction of the manual actuator means.
Dependencies are inferred from the claim text.