Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7182149 | Pneumatic wrench having reinforced strength A pneumatic wrench includes a pneumatic motor, a striking portion, and a drive shaft. The striking portion includes a support seat, a first pin, a second pin, a first hammer, and a second hammer. Thus, the locking strip of the first hammer and the locking strip of t... | 02/27/2007 |
| 4749050 | Impact tool for tunneling An impact tool having an air-operated hammer for impacting against an anvil in the body of the tool to cause the tool to tunnel through the ground and having passages and conduits opening to the front tip of the tool to pass water to lubricate the tool to... | 06/07/1988 |
| 4645016 | Resonant pile driving system A pile driver is described wherein a piston within an internal combustion engine is rigidly coupled to the pile to be driven. The engine is resiliently coupled to the pile so as to move with the pile. Control circuitry modifies the frequency of operation ... | 02/24/1987 |
| 4505340 | Hydropneumatic percussive tool A vibration or reciprocating hydraulically driven impact tool for breaking up paving, compacting soil, or similar construction purposes. The tool employs a piston situated in a housing and configured to form (in cooperation with the housing) three chamber... | 03/19/1985 |
| 4483402 | Paving breaker A paving breaker for the construction industry of the type having a vibrating moil point or tool steel impacted by a pneumatically reciprocated piston including a double walled cylinder slidably receiving the piston designed so that the space between the ... | 11/20/1984 |
| 4479551 | Actuator for a hydraulic impact device A linear actuator includes a ram and a piston separated by a column of hydraulic fluid in a housing. Upward movement of the ram in the housing first seals a finite quantity of hydraulic fluid in the housing cavity. Continued upward ram movement then cause... | 10/30/1984 |
| 4144941 | Directional impact tool for tunneling A hole-driving tool having an air-operated hammer for impacting against an anvil in the body of the tool to cause the tool to tunnel through the ground, wherein the direction of travel is controlled by providing a variable mass distribution over the hamme... | 03/20/1979 |
| 4102408 | Pile driving device A gas cushion impact cap, used in connection with pile driving, is connected to an external pressure chamber holding an additional volume of gas, whereby there will be no appreciable change in the gas pressure during the impact. The gas pressure is primar... | 07/25/1978 |
| 4075858 | Hydraulic pile driving apparatus and method An apparatus and a method for driving piles onshore or offshore, including driving a tubular pile within a submersed tubular jacket leg of an offshore structure and field disassembly. The apparatus hammer includes a displaceable ram structure, mounted within ... | 02/28/1978 |
| 3939922 | Hydraulic hammer assembly A hydraulic hammer assembly is disclosed which comprises a stationary piston suspended within a tubular frame or casing and a cylinder locked inside a massive ram within the casing. The cylinder forms a differential hydraulic assembly with the piston and ... | 02/24/1976 |
