Portable machine tool for vertical drilling, threading and the like

Claim 2

A machine for driving a rotating tool such as for drilling, reaming, tapping or grinding large size deep vertical holes in objects or performing other such operations which comprises: a rigid frame; a power head-support vertically positioned on the frame; a vertically movable power head, for rotating a tool, mounted on vertical slideways on the power head-support; extendable means mounted on the frame for aligning or levelling or raising the machine relative to a workpiece; clamping means on the frame for securing the machine to the workpiece or other fixed anchor to prevent shifting during use; and said power head-support being slidably mounted on the frame with means to slide the power head-support sideways, forward and backwards and means to lock the power head-support tightly to the frame in fixed position.

Claim 3

A machine according to claim 1 in which a vertically slidable bushing holder is supported by the vertical slideways below the power head, and the holder supports a bushing for stabilizing the tool.

Claim 4

A machine according to claim 2 in which the bushing holder has two horizontally swingable arms, each of which arms supports a bushing for the tool, said arms being alternately swingable into a station beneath the power head, lock means to securely and accurately hold the bushings alternately in station for use, and means to fix the other arm in standby swung-out position.

Claim 5

A machine for drilling, tapping, reaming or grinding large size deep vertical holes in objects or performing other such operations which comprises: a rigid frame; at least three wheels attached to the frame for effecting rolling movement of the machine; at least three extendable leg means attached to the frame for aligning, levelling or raising the machine relative to a workpiece and to lift the wheels out of contact with a workpiece; at least three clamping means attached to the frame for securing the machine to a workpiece or other fixed member to prevent shifting of the machine during use; a power head-support vertically positioned on the frame; means to slidably move the power head-support sideways, forward and backwards on the frame, and means to lock the power head-support tightly to the frame in fixed position; a vertically movable power head mounted on vertical slide ways on the power head-support; a bushing holder mounted by the vertical slide ways below the power head, said holder supporting a bushing for a tool driven by the power head; and power-driven screw means on the power head-support to raise and lower the power head on the slideways.

Claim 6

A machine for drilling, tapping, reaming or grinding large size deep vertical holes in objects or performing other such operations which comprises: a rigid frame; at least three wheels attached to the frame for effecting rolling movement of the machine; at least three extendable leg means attached to the frame for aligning, levelling or raising the machine relative to a workpiece and to lift the wheels out of contact with a workpiece; at least three clamping means attached to the frame for securing the machine to a workpiece or other fixed member to prevent shifting of the machine during use; a power head-support vertically positioned on the frame; means to slidably move the power head-support sideways, forward and backwards on the frame, and means to lock the power head-support tightly to the frame in fixed position; a vertically movable power head mounted on vertical slide ways on the power head-support; a bushing holder mounted by the vertical slide ways below the power head, said holder supporting a bushing for a tool driven by the power head; and power-driven screw means on the power head-support to raise and lower the power head on the slideways.

Claim 7

A machine according to claim 4 in which the bushing holder has two horizontally swingable arms, each of which arms supports a bushing such as for a drilling or thread-tapping tool, said arms being alternately swingable into a station beneath the power head, lock means to securely and accurately hold the bushings alternately in station for use, and means to fix the other arm in standby swung-out position.

Claim 8

A machine according to claim 2 in which the power head-support and bushing holder have power-driven means to raise and lower them on the slideways.

Claim 9

A machine according to claim 4 in which the frame has pivot guide means intermediate its ends for use in rotating the machine in a horizontal circle.

Claim 10

A machine according to claim 1 in which the frame has an outwardly projecting horizontal branch on each side of the end containing the power head-support, and said frame branches and back end of the frame each carry wheels for moving the machine and also carry the extendable means for aligning and levelling the machine, said extendable means comprising power operated vertically displaceable aligning and levelling legs.

Claim 11

A machine according to claim 1 in which the frame has pivot guide means intermediate its ends for use in rotating the machine in a horizontal circle.

Claim 12

A machine according to claim 9 in which the frame has a plurality of wheels positioned for circular movement of the machine and one of said wheels is a power operated drive wheel.

Claim 13

A machine according to claim 1 in which the frame is in sections detachably fastened together and the length of the frame is adjustable by a spacer between the sections.

Claim 14

A machine according to claim 1 having a surface for holding a level adjacent the area of drilling or tapping so that an operator can readily observe any shifting of the machine in operation.

Claim 15

A machine according to claim 2 comprising power-driven screw means for effecting vertical displacement of the bushing holder independent of movement of the power head.

Claim 16

A machine according to claim 1 in which the extendable means and the clamping means are operated by power means mounted on the machine.

Claim 17

A machine according to claim 2 comprising power-driven dual screw means for effecting vertical displacement of the bushing holder independent of movement of the power head.