Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7326012 | Broaching apparatus and method for producing a gear member with tapered gear teeth The apparatus of the present invention provides a broaching machine configured to produce an internal gear member. The broaching machine includes a broaching tool defining a central axis. The broaching tool includes a first set of broaching teeth configured to cut b... | 02/05/2008 |
| 7021874 | Internal broaching machine and internal broach A broach for internal broaching is formed on its pull end and/or follower end with a tapered surface machined with high accuracy. A pull head and/or a retrieving head of a broaching machine, which drivingly grip the pull end and the follower end the broach, is forme... | 04/04/2006 |
| 6527484 | Helical tooth broach A helical gear tooth broach having an elongate body having a series of axially aligned and spaced teeth disposed thereon. The direction of tooth spaces or traces of the teeth in a longitudinally extending helical alignment and the direction of the gullets... | 03/04/2003 |
| 6076998 | Replaceable blade for deburring device A replaceable blade for a deburring device which is installed in a deburring mold with a cavity for inserting and pulling out a work. The replaceable blade comprises a main body, several intake channels which are provided from the surface to the inside of... | 06/20/2000 |
| 5282702 | Wafer broaching tool A finish broaching tool for finish cutting helical splines on the interior of an annular workpiece has a multiplicity of groups of circumferentially disposed teeth. Each group of circumferentially disposed teeth is formed on an individual wafer adapted to... | 02/01/1994 |
| 4671709 | Pot broach A tooth broach designed for use with thin workpieces having its teeth arranged in circumferentially extending sets in each of which the teeth are arranged in groups of one or more teeth, and gaps devoid of teeth between adjacent groups. The teeth are furt... | 06/09/1987 |
| 4214650 | Brake adjuster having multi-sided internal broach A brake adjuster for implementation between the brake housing and pressure plate of a brake disk stack. A casing is fixedly secured to the brake housing and receives therein a spring follower. Maintained within the spring follower and engaged at one end t... | 07/29/1980 |
| 4111586 | Broach A tension broach comprising a drawbar, a roughing shell on said bar, a finishing shell on said drawbar, said drawbar supporting said roughing shell against axial movement and limiting rotational movement thereon, said drawbar supporting said finishing she... | 09/05/1978 |
