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 |
| 7427842 | Series motor and method of controlling the same A circuit for a series motor for a power tool is disclosed, wherein reliable switching is achieved by means of two electronic switches, without the use of a mechanically disconnecting switch. To this end, two electronic switches, preferably triacs, are preferably co... | 09/23/2008 |
| 5121802 | Method and arrangement for controlling a rock drilling apparatus The invention relates to a method and an arrangement for adjusting the percussion and the feed of a rock drilling apparatus with respect to each other. In the method, the volume flow of pressure fluid to be supplied to a percussion device (7) and a feed m... | 06/16/1992 |
| 4470635 | Method and apparatus for excavating a tunnel or gallery face A method of excavating a tunnel face in which the cutting head is sunk into the face to form an initial penetration and is then moved laterally. The power consumption of the cutting head drive motor is measured, compared with the setpoint value and the at... | 09/11/1984 |
| 4367900 | Mineral mining installation with electronic control A shearer-type mineral winning machine has three-phase a.c. motors on its main body for driving cutting drums and for propelling the machine along a mineral face. The frequency of the a.c. power supplied to the motor which serves to move the machine is va... | 01/11/1983 |
| 4269448 | Mineral mining machine cutter driving mechanism having a load sensing device to regulate the haulage speed of the machine when the cutter driving mechanism is overloaded A mineral mining machine having haulage drive mechanism and at least one cutter drive unit for cutting elements which may be at each end of the mining machine. The cutting elements are driven by an electric motor through a variable speed gear-train and th... | 05/26/1981 |
| 3988578 | Method and apparatus for controlling the steplessly variable cutting rate and feed rate of mining machines Method and apparatus for controlling a mining machine, specifically a longwall mining machine, of the type in which the mining machine is advanced into a mineral seam by an advancing motor and a rotating mineral-cutting element on the machine is driven by... | 10/26/1976 |
