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Thomas Edison obtained a patent for an electrographic vote recorder.
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| Number | Title | Issue Date |
| 6182545 | Wedge-lockable removable punch and die bushing in retainer A conventional ball lock mechanism has been replaced with a wedge adapted to lock a tool, such as a punch, forming tool or die bushing in a retainer block in which the tool can be accurately positioned relative to the retainer block. The tool is released ... | 02/06/2001 |
| 5056372 | Copper collet grip mechanism The present invention describes an improved collet grip for holding tensile bars during testing. The collet includes a 90° concave surface to match the machined tensile bar thereby improving the gripping action. The collet also has a taper on the inside ... | 10/15/1991 |
| 5056968 | Device for coupling a rod for drilling a taphole The device includes a chuck designed to be secured to a working tool and which has a front cavity for receiving an end of a drilling rod and a gripping device for fastening the end of the rod in this cavity. The gripping device is actuated by pneumatic or... | 10/15/1991 |
| 4756538 | Device for clamping drill pipe and the like in mouse hole pipe The invention relates to a clamping device used for making up or breaking apart joints of drill pipe, drill collars and the like in mouse hole pipe during oil drilling operation. A clamping means of the device firstly clamps the drill pipe therebetween du... | 07/12/1988 |
| 4638692 | Wire stripper with double wedge spring loaded gripper A wire gripper (48) includes a housing (50,52,56) that defines a chamber (62) which has sidewalls (64) that taper in an axial direction. Jaws (66) are closely and slidably received into chamber (62). Axial spring (74) biases jaws (66) axially outwardly re... | 01/27/1987 |
| 4594127 | Method and apparatus for growing crystals Method and apparatus for suspending a seed crystal over a fixed crucible containing a melt from a rotary and axially operable vertically disposed drive adaptor comprising the steps of forming a tubular receptacle adapted to be detachably secured at its up... | 06/10/1986 |
| 4566705 | Tool retainer having axially and radially movable clamping members The drill spindle of a deep well drilling machine has a sleeve-like extension with a conical internal surface which is complementary to conical external surfaces on an annulus of claws forming part of a clamping device which is inserted into the extension... | 01/28/1986 |
| 4458374 | Electric tooth brush holder This electric tooth brush holder includes a cylindrical handle portion, and a motor, a drive unit and a cylindrical attachment disposed within said cylindrical handle portion, wherein said attachment is designed to reciprocate within the cylindrical handl... | 07/10/1984 |
| 4298074 | Surgical device using impulse motor The present surgical tool uses high frequency impulses to replace rotating or oscillating members in cutting through or inserting materials into bone. One embodiment comprises a chisel which uses high frequency impulses to remove bone or other hard materi... | 11/03/1981 |
| 4174648 | Punch retainer A punch and retainer assembly wherein the punch has a flattened surface at the upper end of the side wall thereof and a radially inwardly extending recess directly below the flattened side wall portion. The punch retainer includes a vertically movable lat... | 11/20/1979 |
