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 |
| 7251924 | Non-detachable chain link for material mover chain The present invention provides a non-detachable chain link for a material mover chain. Chain link comprises a body portion having an aperture therethrough and a hook portion including a tip portion. A recess defined by the hook portion is adapted to contain one or m... | 08/07/2007 |
| 6595603 | Drive sprocket wheel for a track vehicle An undercarriage for a track vehicle includes an endless track having links of constant length connected end to end in the direction of travel, each link having a pair of spaced-apart guide webs and a cog which connects the webs, the cogs being of substan... | 07/22/2003 |
| 5131723 | Guide for a hewing machine mounted on a conveyor A guide rail 4 is used for movably mounting a coal hewing machine on a chain scraper conveyor 3. The hewing machine has a guide shoe 26 guided by the guide rail 4 and a chain wheel. The conveyor 3 has a conveyor channel 2 and, on the filling side, a mount... | 07/21/1992 |
| 4993779 | Element to form a rack for a mining machine haulage system An element, adapted to be inter-engaged with a plurality of similar elements to form a rack for a mining machine haulage system, has each element comprising at one end, a looped end portion including inner and outer arcuate bearing surfaces, the inner bea... | 02/19/1991 |
| 4832187 | Modular center drive conveyor belt A conveyor belt composed of a plurality of interconnected modules, each of identical construction and end to end mateable. Each module includes a multiplicity of elongated parallel spaced link elements terminating in first and second link ends. An interme... | 05/23/1989 |
| 4501447 | Haulage drive A link component is adapted for interfitment with like link components to form a flexible chain free of hinge pins and cooperable with a drive sprocket. The link component has complementarily-shaped end parts (10, 11; 10' 11') whereof each is the true or ... | 02/26/1985 |
