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 |
| 7147117 | Tower crane device A crane tower device includes a basket that supports a tower crane and sits within a bay formed by the vertical columns of a building under construction. The basket and the tower crane are supported by support stubs that are attached to the vertical columns. Because... | 12/12/2006 |
| 6030170 | Hydraulic lift boom attachable to a tractor's draw bar and three point hitch The hydraulic lift boom attachment including a support frame and a telescopic lifting arm wherein the support frame is coupled to a tractor's three point hitch which hydraulically raises or lowers the support frame. The telescopic lifting arm has one end ... | 02/29/2000 |
| 6021910 | Construction crane base A platform assembly designed for use in supporting a crane during the construction of a multi-story building is described. The assembly includes a platform for supporting a crane and means for fixedly attaching the platform to differing locations along th... | 02/08/2000 |
| 5797504 | Portable hoisting system A hoisting system for lifting construction items at a construction site that includes a base assembly, a telescoping pole assembly carried on the base assembly, a slidably positionable line guide assembly slidably mounted to the telescoping pole assembly,... | 08/25/1998 |
| 5237690 | System for testing adaptor card upon power up and having disablement, enablement, and reconfiguration options A data processing system such as a personal computer includes a plurality of expansion connectors for receiving adapter cards. A non-volatile memory stores programmable option select (POS) data that is stored when the system is configured. A Power On Self... | 08/17/1993 |
| 5033240 | Method and apparatus to enshroud large vertical structures Apparatus to temporarily enclose multi-story structures such as municipal water towers during sandblasting and painting to thereby contain the debris and overspray from the environment. A plurality of booms extending in an array outwardly from the top of ... | 07/23/1991 |
| 5029717 | Crane A crane or lifting device includes a base assembly with a telescopic and rotatable column mounting a boom assembly including a telescopic boom arm. A strap is connected at one end thereof to the base assembly, extends through the boom arm, and is connecte... | 07/09/1991 |
| 4718563 | Overhead gantry The instant invention concerns a transportable overhead gantry for spanning a roadway having two supports linked in an articulated manner to a cross-member. The cross-member is adjustable for height, for example using a winch operable to move the cross-me... | 01/12/1988 |
| 4682930 | Apparatus for upward and downward movement of an arm in a robot system for taking out injection molded and die casting products An apparatus connected to an arm in a robot system removes injection molded and die cast products while compensating for the load on the piston rods of the apparatus. A chuck for grasping the products is moved up and down by a pair of pneumatic cylinders ... | 07/28/1987 |
| 4196814 | Vertical telescoping lower crane A rotary tower crane having a tower which can be extended step-wise by adding a section between the boom supporting segment and segments of the supporting structure is provided with a host and crab mechanism for adding or removing a section adjacent to th... | 04/08/1980 |
