Did You Know...
...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 7287948 | Load lifter for a motor vehicle A load lifter for a motor vehicle includes a vertically standing outer support firmly attached to the motor vehicle, having an outer support through whose interior a second load support can be pivoted around an axis located in the lower area. The load support is con... | 10/30/2007 |
| 7111744 | Crane mount assembly for utility truck A crane mount assembly having a mounting base and tower, the base having a pair of longitudinal members in parallel spaced alignment with transverse members positioned therebetween, and a top and bottom plate secured between the longitudinal members and the transver... | 09/26/2006 |
| 6571902 | Backhoe auxiliary hydraulics control system A method of automatically setting an auxiliary hydraulic valve's flow rate and returning to that flow rate automatically is disclosed. The work vehicle such as a backhoe has two hand controls, one of which has a button, and the other has a thumb wheel. To... | 06/03/2003 |
| 5405028 | Crane vehicle A crane vehicle which reaches a minimum traveling speed of 62 km/h on public roads and gives the vehicle driver a range of vision with a radius of not more than 12 m comprises a vehicle frame which is substantially lowered to the level of the centers of t... | 04/11/1995 |
| 5332110 | Tractor mounted hydraulic pipelayer with side boom A tractor having a pair of endless, segmented, high drive tracks includes a side boom and a side-mounted counterweight. Boom angle is controlled by a boom winch with a load winch provided for lifting a load. Both winches are hydraulically driven and provi... | 07/26/1994 |
| 5249643 | Vehicular self-propelled aerial work platform and telescoping parallelogram boom therefor A vehicular self-propelled aerial work platform wherein a lower telescopic boom assembly is connected to a riser frame assembly having an upper telescopic boom assembly also connected thereto. A work platform is connected to the outer end of the upper tel... | 10/05/1993 |
| 5107997 | Cable machine control Cable machine control, particularly a grapple yarder is provided with an integrated control system whereby the operator is provided with controls each of which controls a desired operation or movement of the grapple. In particular the controls include a h... | 04/28/1992 |
| 5058752 | Boom overload warning and control system A boom apparatus for use in lifting and transporting a payload includes a boom pivotally mounted on a support structure and including base and outer boom sections, the outer boom section being telescopically received within the base boom section and being... | 10/22/1991 |
| 4792052 | Apparatus for controlling the number of revolutions of an engine An apparatus including a grip sensor for controlling the number of revolutions of an engine. The grip sensor detects whether or not fingers of an operator approach toward the grip sensor or the former come in contact with the latter. Usually, the grip sen... | 12/20/1988 |
| 4667834 | Crane apparatus having hydraulic control system A crane apparatus having a hydraulic system for controlling the operation of the hoist and bridge, and gantry drive functions of the equipment. The hoist, bridge and drive components are driven by an AC motor that is powered by an AC generator. The AC mot... | 05/26/1987 |
| 4660730 | Apparatus for controlling movement of valve override control handles Apparatus for use in supporting a plurality of override control handles of a control valve assembly, the control handles supported for movement in a first direction between engagement and disengagement with the control valve spools and supported for movem... | 04/28/1987 |
| 4643320 | Crane bracket for mounting over the chassis side members of a truck A bracket for mounting a crane over either chassis side member of a truck has an elongated body member having removable, telescopically-extendable rods at its ends provided with likewise-telescopic supporting legs to provide support against the driving su... | 02/17/1987 |
| 4544070 | Sway control arrangement for hoist systems An apparatus for controlling sway and pendulous motion of suspended loads is disclosed which is particularly suited for embodiment in association with a mobile crane or similar hoist system. The arrangement includes stabilizing cables attached to a load l... | 10/01/1985 |
| 4523686 | Anti-two block system An improved anti-two block system having a boom hoist drum driven by a first hydraulic motor with a first variable displacement motor controlled by a first ram moveable in a given direction to supply fluid pressure for driving the boom drum to lower a boo... | 06/18/1985 |
| 4427121 | Hydraulic valve control for aerial book devices A hydraulic control system which is of an open center parallel circuit arrangement for aerial boom devices with two return lines, said system having control valves for upper and lower boom arms, wherein the lower boom control valve overrides the upper boo... | 01/24/1984 |
| 4411368 | Safety system for hydraulically controlled hoisting apparatus In this device, with each jack there is associated a pressure detection system comprising two thresholds, the upper one corresponding to the maximum pressure permitted, this double detection making it possible to determine the change in the pressure durin... | 10/25/1983 |
| 4172529 | Crane The specification discloses a crane including a base having a boom pivotally supported at one end from the base. The opposite end of the boom is adapted for receiving the load to be carried by the crane. A mast and upper tension member system are affixed ... | 10/30/1979 |
| 4171054 | Work vehicle with hydraulic circuit for swivel motor and work assembly arm motor A work vehicle having a work arm assembly mounted for horizontal oscillation on a swivel platform. The arm assembly and the swivel platform are actuated by separate hydraulic actuators. The two actuators are connected in parallel with one another to a con... | 10/16/1979 |
| 4124226 | Electrohydraulic outrigger control system A mobile crane having four hydraulically operated outrigger assemblies, two on each side, and each having a horizontal extend cylinder and a vertical stabilizer cylinder, includes a electrohydraulic control system whereby any outrigger assembly can be ind... | 11/07/1978 |
| 4119118 | Automatic machine motion restricting mechanism Fluid links are interposed between manual levers which control the motions of a machine such as a construction crane and associated spool valves which regulate the machine motions. In normal operation within predetermined safe limits of machine motions, p... | 10/10/1978 |
| 4081055 | Hydraulic device for controlling the perpendicularity of boom members in mobile platforms In connection with a pair of articulated booms there is a leveling system consisting of a sprocket wheel at the base of the lower boom and a co-acting sprocket wheel at the free end of the upper boom with chains and rods interconnecting the two sprockets ... | 03/28/1978 |
| 4033468 | Hydraulic boom-lift system with selective speeds Greater overall speed of crane operation is made possible by using a plurality of hydraulic piston-cylinder sets together with valving which can direct the pumped hydraulic fluid selectively to either of the cylinder sets or to both of them. Preferably th... | 07/05/1977 |
| 4013174 | Swing drive with automatic shut-down control A load handling device is disclosed having an improved swing drive assembly including a hydraulically driven pivotally mounted swing drive pinion biased against a segmented ring gear by a hydraulic actuator with a guide roller adjacent the pinion engaging... | 03/22/1977 |
| 4011699 | Telescopic boom quick retract hydraulic circuit There is disclosed a telescoping boom with first and second motors, each connected between adjacent boom sections to extend and retract one boom section with respect to the other. Each motor has a piston slidably received in a cylinder to define an extend... | 03/15/1977 |
| 3977546 | Wrecking and hauling truck A truck body unit configured for wrecking and/or hauling operations includes a fabricated body unit having a structural framework suitable for connection to a chassis frame with a flat bed generally configured for hauling operations, a boom being pivotabl... | 08/31/1976 |
| 3973679 | Bridge crane with load cells for correlating the lift operation This disclosure relates to a method of and apparatus for lifting a load utilizing an existing bridge or gantry-type overhead crane in combination with a portable lifting beam or Strongback adapted to be lifted into position and partially supported by the ... | 08/10/1976 |
| 3967736 | Boom control system A boom is disclosed comprising a pivotable structure including an upright support having wheels rotably supported on a rail and a truss supported above the rail by the upright support. A grapple is suspended from the truss and a winch mounted to the pivot... | 07/06/1976 |
| 3963127 | Blocking arrangement in hydraulically operated cranes In hydraulically operated loading cranes, particularly loading cranes comprising multiple loading arms, a blocking device in the form of a return piston arranged, upon occurrence of an excessive pressure in the master cylinder, to prevent operation of pis... | 06/15/1976 |
