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 |
| 7673850 | Safety guard for elevator machine A safety guard apparatus for an elevator machine having a brake and a sheave for engaging one or more hoist ropes rotatably driven by the elevator machine, the safety guard apparatus consisting of a sheave guard including a front sheave wall, a back sheave wall and ... | 03/09/2010 |
| 7347411 | Splaying snatch block A snatch block for facilitating the movement of loads in loading or unloading operations includes a sheave, two side sections and a top section. The top section is releasably coupled to at least one of the side sections and pivotable with respect to at least one of ... | 03/25/2008 |
| 7168687 | Snatch block, snatch block assembly and method of use Various exemplary embodiments for snatch block and snatch block assemblies are disclosed. A snatch block having a sideplate that is pivotable, enabling a bight of rope, cable, or chain to be inserted is disclosed. The pivotable sideplate may be engaged with a retain... | 01/30/2007 |
| 6971636 | High speed safety block assembly A high speed safety block assembly includes a first and second cheek plates with a sheave and axle installed between the cheek plates. The cheek plates each have a recessed area on their inner surfaces and have interlocking ears which increase the safety of the bloc... | 12/06/2005 |
| 6966546 | Lower block for a cable actuator The invention concerns a cable block, especially a lower block for cable controls, with at least one cable roller enclosed by a shrouding cover with entry and exit openings for a carrying cable, wherein a cover element is inserted in the entry and exit opening, havi... | 11/22/2005 |
| 6651962 | High speed safety block assembly A high speed safety block assembly includes a first and second cheek plates with a sheave and axle installed between the cheek plates. The cheek plates each have a recessed area on their inner surfaces and have interlocking ears which increase the safety ... | 11/25/2003 |
| 6244570 | High speed safety block assembly A high speed safety block assembly includes a first and second cheek plates with a sheave and axle installed between the cheek plates. The cheek plates each have a recessed area on their inner surfaces and have interlocking ears which increase the safety ... | 06/12/2001 |
| 5649635 | Easily removable sheave assembly A crane boom top is disclosed in which a sheave assembly having a number of sheave sets is supported on the crane boom top by boom sheave supports. Each sheave set is mounted on an individual shaft and connectors connect the individual shafts to the boom ... | 07/22/1997 |
| 5573226 | Apparatus for guiding an enlogated item An apparatus for guiding elongated items, such as cables, wires, hoses, and the like, onto or from spools. The apparatus includes two frame members that are pivotally and hand-releasably connected together to form an enclosed frame through which the elong... | 11/12/1996 |
| 5056760 | T-slot sheave A sheave that has the advantage of being able to be quickly coupled to a le, and quickly decoupled from the cable. A further advantage is that the shaft of the pulley on which the cable rides is journaled at each end in side members that interlock when t... | 10/15/1991 |
| 4676484 | Helicopter transportable traveling block A helicopter transportable traveling block having means for ready assembly and disassembly into component portions of preselected maximum weight, the traveling block being formed into two sub-assemblies, each having an inner and outer plate with a shaft t... | 06/30/1987 |
| 4669154 | Support elements for vertical members A connector (10) interposed in a support element (L) by attachment to first and second displaced ends (L1, L2) thereof to selectively permit an object to pass transversely through the longitudinal axis of the support element while em... | 06/02/1987 |
| 4595174 | Horizontal line grip device A grip device for mounting along a horizontal line, such as a rope or cable, to prevent a load from falling when one end of the line is no longer supported in its horizontal position. The device consists of a shell in which is mounted by means of a pin, a... | 06/17/1986 |
| 4533026 | Device which can brake and/or stop a load secured to it and which falls, notably an anti-fall safety device A load carrying device, movable along a rope, has a casing formed of two cheeks, a shaft supported on the casing, and a pulley supported on the shaft. Two diverters are disposed on opposite cheeks of the casing so a rope enters the device on one diverter,... | 08/06/1985 |
