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US 7,094,008 B2Granted
Power driver bit self-centering and positioning apparatus
OwnerWilliam Richard Hartsfield, Jr.inventor
Life of this patent
Estimating the term…
Abstract
A portable combined clamp and bit guide assembly guides a bit, turned by a power driver, into the exact center between the opposing faces of the clamp. The clamp is designed to hold workpieces having substantially parallel edges and a substantially linear centerline on their upper surfaces, and provides a drill path perpendicular to that centerline. An optional incline adapter supports the clamp and bit guide at an angle to the workpiece, while also aiding in support of the workpiece itself. The entire assembly may be carried in a single case with a power driver and bits.
Claims8
A power driver bit self-centering and positioning apparatus for applying rotating bits to a workpiece, comprising:
- a first workpiece clamp assembly having
- a first elongate clamp iron, the elongate iron having a first front edge with a first vertical skirt depending therefrom, the first vertical skirt having a first proximal lower corner at one end and a first distal lower corner at the other, the elongate iron further having a first rear edge, a first proximal end and a first distal end, and a first elongate slide rod rigidly affixed to the first proximal end extending vertically from and at right angles to the elongate axis of the first elongate clamp iron;
- a second workpiece clamp assembly having
- a second elongate clamp iron, the elongate iron having a second front edge with a second vertical skirt depending therefrom, the second vertical skirt having a second proximal lower corner at one end and a second distal lower corner at the other, the elongate iron further having a second rear edge, a second proximal end and a second distal end, and a second elongate slide rod rigidly affixed to the second proximal end extending vertically from and at right angles to the elongate axis of the second elongate clamp iron;
- the second workpiece clamp assembly rotated about the axis of the second elongate slide rod 180 degrees and positioned relative to the first workpiece clamp assembly so that the second vertical skirt faces, and is parallel to, the first vertical skirt;
- means for pushing the first and second vertical skirts towards each other so as to clamp a workpiece from opposite sides;
- a rigid elongate chuck assembly holder with first and second vertical slide rod guide holes drilled through either end,
- the guide holes sized to slip fit the slide rods, and a chuck assembly bearing having a vertical axis placed at a prescribed position between the centers of the slide rod guide holes;
- a chuck assembly disposed within the bearing and having a chuck below the holder capable of gripping rotating bits, and a shank above the holder capable of being driven by the chuck of a power driver, the shank being rigidly attached coaxially with the chuck so that when the shank is driven, the chuck rotates;
- the elongate slide rods of the first and second workpiece clamp assemblies being inserted into the first and second slide rod guide holes, respectively.
7 more elements
A power driver bit self-centering and positioning apparatus for applying rotating bits to a workpiece, comprising:
- two identical rigid subassemblies,
- each further comprising a section of angle iron in a horizontal position with one flat facing upward, the other flat facing forward, the upward-facing flat having a rear edge, and the forward-facing flat having a first depending end corner and a second depending end corner;
- an elongate rigid slide rod of round cross-section affixed to one end of the upward facing flat of the angle iron and extending upward;
- an elongate rigid rail of rectangular cross-section affixed to the bottom of the slide rod and extending forward at right angles to both the slide rod and the angle iron;
- a first elongate rigid flat bar of a width substantially the same as that of the angle iron, affixed to the top of the angle iron about two-thirds of the way toward the other end of the angle iron and facing forward at right angles to the angle iron;
- a rigid sleeve fixedly attached to the top of the angle iron adjacent to the base of the slide rod, having a cross-section large enough and of the same shape and orientation as to hold slidingly a second elongate rigid flat bar parallel to the first flat bar;
- a sliding arm having a rectangular hole in one end and a threaded hole in the other, the rectangular hole sliding over the free end of the rigid rail, a threaded screw being threaded into the threaded hole, the threaded screw being perpendicular to the angle iron and having a handle at one end and a swivel pad at the other, the handle facing away from the angle iron and the swivel pad facing toward the forward-facing flat of the angle iron;
- one of two rigid subassemblies rotated 180 degrees about a vertical axis relative to the other of the two rigid subassemblies, the flat bars of each being inserted into the sleeves of the other, so that the two rigid rails and the two angle irons form a rectangle with the two slide rods extending upward from opposite corners;
- a rigid, rectangular chuck holder with two cylindrical bushings of equal diameter installed through vertical holes in opposite ends, and a bearing also with a vertical axis installed at center point between the vertical holes;
- a chuck assembly installed through the bearing, the chuck assembly further comprising a first chuck for holding a bit below the bearing, and a shank capable of being turned by a second chuck of a power driver;
- the chuck holder being installed on the two rigid subassemblies by sliding the bushings downward over the slide rods;
- and
- the swivel pad of one subassembly being positioned against the rear edge of the other, so as to permit a workpiece to be clamped between the forward-facing flat of one subassembly and the forward facing flat of the other subassembly.
10 more elements
Dependencies are inferred from the claim text.