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 |
| 4618277 | Print head The print head has armatures each provided with a holding part connected to one end of a spring plate. For avoiding concentration of a tensile stress on a brazed part between the holding part and the spring plate, part of the holding part extending contig... | 10/21/1986 |
| 4411538 | Print-head of a dot-printer A print head adapted to be used for a dot-printer. A novel support device is disposed in the print head for pivotally supporting one end of each of a plurality of armatures on a support member. The support device in this invention comprises; (a) a leaf sp... | 10/25/1983 |
| 4403875 | Armature support device of a print head An armature support device for rotatably supporting, in a print head, one end of an armature which holds a print wire at the other end thereof. The support device comprises a support member and a spring member. The spring member is made of a piece of a re... | 09/13/1983 |
| 4394093 | Support means for print wire A print head for a serial dot-printer which includes improved structure to fix each print wire to a pivotable armature. The armature is provided with an arm portion which is made of a stainless steel plate and consists of a pair of mutually opposed side p... | 07/19/1983 |
| 4389128 | Print head for a dot matrix printer A print head for use in a dot-matrix printer consisting of a plurality of print wires, a guide member with a nose portion for guiding the print wires, a plurality of armatures, an armature support member for supporting one end of the armatures correspondi... | 06/21/1983 |
| 4135830 | Wire printer printing head A wire printer printing head comprises a support member, a plurality of printing elements having a print wire with a flap-armature electromagnet and a sound absorbing cover. The printing element are radially and slidably mounted to the support member and ... | 01/23/1979 |
| 4117435 | Flap-armature electromagnet A flap-armature electromagnet comprises a U-shaped yoke, a pole core, a coil, a flap-armature, a compression spring and a coil spring. The flap-armature is rockingly supported on the yoke by means of projections formed at the upper rear end of the yoke an... | 09/26/1978 |
