Abstract: A lifting device for a marine vessel having a foot part that can be put on a flat support and an upper part adapted to pivot with respect to the foot part about a vertical axis and having at least one lifting arm and the lifting arm being extendible by a hydraulic cylinder assembly.

Abstract: A crane boom stowing apparatus utilizes a pair of anchor members attached to the crane frame and a pair of leg members pivotally secured at one end to the crane boom. The leg members are pivotally movable between a boom-stowing condition at which the other ends of the legs are releasably secured to the anchor members and a second condition at which the leg members are positioned generally alongside the boom for releasable securement thereto.

Abstract: A rough terrain vehicle comprises a vehicle chassis, resilient terrain-engaging wheel assemblies connected to the chassis and enabling vertical and angular deflection of the chassis relative to the terrain during vehicle movement, a telescopic crane boom carried by the chassis, a pivot pin for connecting the boom to the chassis and enabling limited reciprocable angular deflection of the boom relative to the chassis as the vehicle moves across supporting terrain and a hydraulic boom hoist cylinder to raise and lower the boom. A deflection reduction system is connected between the chassis and the boom to reduce or eliminate vertical and angular deflection (bouncing and porpoising) of the chassis relative to the terrain which tends to occur in response to dynamic loads imposed on the vehicle axles by movement across uneven terrain or by acceleration or deceleration of the vehicle.

Abstract: A vehicular towing device comprised of an elevation arm having a socket on one end and pivotably mounted to a mounting bracket on an opposed end interposed there between an hydraulic cylinder along with associated support cylinders so that the socket on the end of the elevation arm may rotationally receive therein the ball installed on a towed vehicle, the hydraulic cylinder co-acting with the elevation arm to elevate the front end of the towed vehicle off the ground surface so that the towed vehicle may be towed with only the rear wheels in contact with the ground surface.

Abstract: A portable hoist is provided for lifting, transporting, and depositing loads onto a platform, such as a work bench, or into a vehicle, such as a pick-up truck. The portable hoist comprises a mounting for attachment to a support, an upright support structure connected to the mounting by a hinge which allows for swinging movement of the support structure about its vertical axis, and a boom pivotally secured at one end to the upper end of the support structure such that the free end of the boom can be raised and lowered. A powered unit acts between the support structure and the boom serves to raise and lower the boom. A sheave is carried at the free end of the boom and a hoist line connected to the support structure at a level substantially below the pivotal connection of the structure to the boom loops over the sheave and carries a member for attachment to the load to be lifted.

Abstract: A crane or the like (e.g. an access platform or excavator), having a boom wherein the boom is lifted or lowered by one or more hydraulic rams or the like, the or each ram acting on a cradle on which the boom rests and in which it is free to move, the cradle being linked to the platform or the base of the crane or the like, at a point between the foot of the ram(s) and the foot of the boom or at the foot of the boom. This arrangement has the advantage that the boom stresses during lifting are evened out, and expensive accurate machinery of the boom pivot holes are avoided.

Abstract: A Compact Heavy Duty Lifting Crane (CHDLC) for removing and installing heavy objects such as engines and transmission from vehicles. The CHDLC incorporates a feature that allows the vertical lifting angle of the telescoping boom (40) to remain constant as the telescoping pylon cylinder (18) is raised. This feature is particularly useful for removing engines located in limited-space engine compartments such as those encountered in vans and buses. The CHDLC consists of two major assemblies: a base assembly and a portable lifting crane. When the CHDLC is used as a standard utility crane in a repair shop the crane is mounted to the base assembly. When the CHDLC is required to be mounted on a truck bed the crane is removed from the base assembly and installed on a truck pylon plate (14a) that is permanently mounted to the bed of the truck. Additionally, the CHDLC may be placed in its storage configuration. In this configuration the CHDLC occupies a horizontal area of only four square feet.

Abstract: A power shovel generally consisting of a support unit, a stiffleg operatively connected to the support unit for pivotal movement about a stiffleg pivot axis, a handle operatively connected to the stiffleg for pivotal movement about a handle pivot axis, a dipper mounted on the handle, a crowd system operatively connected to the handle for crowding and retracting the dipper and a hoist system for hoisting and lowering the dipper comprising at least one upper fluid actuated rod and cylinder assembly operatively connected at a lower end to the stiffleg and operatively connected at an upper end thereof to the handle on one side of the handle pivot axis, at least one lower fluid actuated rod and cylinder assembly operatively connected at a lower end thereof to the stiffleg and operatively connected at an upper end thereof to the handle on a side opposite to the operative connection of the upper end of the upper fluid actuated assembly to the handle, relative to the handle pivot axis, and apparatus for selectively s

Abstract: 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 boom control valve. The system includes a valve connected to a pump actuating engine and responsive to hydraulic pressure to increase the speed of the fluid pump when the flow or pressure in one return line is reduced due to diversion of fluid within the system into the second return line. The system also includes a normally open relief valve carried by the boom supporting turntable adjacent its pivotal connection to the lower boom and operable to control a winch actuator and to deactivate said winch actuator when the boom is in an unstable position.

Abstract: A tree-trimming apparatus mounted on a mobile support vehicle. The apparatus includes a telescoping boom pivotally mounted on a pedestal. The pedestal is pivotally mounted to a turntable which is rotatably mounted on the support vehicle. An operator's station is mounted on the pedestal to provide control of the apparatus. A large diameter circular saw is mounted at the end of the boom and is powered by a high speed hydraulic motor to provide high cutting efficiency. A fiberglass boom and electrically non-conductive hoses provide maximum safety for the operator.

Abstract: A mobile device for handling material of various types including a frame having an endless track mounted on each side thereof for providing mobility to the frame. A source of power in the form of an internal combustion engine is mounted directly on the frame. A turntable is rotatably mounted on the frame with a boom pivotally connected at its lower end to the turntable at a point spaced from the rotating axis of the turntable for pivotal movement of the boom in a vertical plane over the turntable by means of a hydraulic ram connected at its lower end to the turntable at a point intermediate the rotating axis of the turntable and the pivotal connection of the lower end of the boom with the upper end of the ram connected to the boom. The turntable is mounted on the frame for pivotal movement of the same with the boom thereon transversely to each side of the device.

Abstract: A suspension for a replaceable hydraulically operable tool attachment on the tool holder excavator or crane comprises a fork member pivoted to the tool holder by pivot pins which contain bores to establish hydraulic communication between fluid supply and discharge passages in the tool holder and associated passages in the fork member leading to the tool.

Abstract: An hydraulic platform comprises a support structure which mounts a boom assembly comprising a plurality of booms pivotally connected in end-to-end relationship and carrying on its free end a working platform or cage, hydraulic actuator means for pivoting the booms relative to the supporting structure and one another to carry the working platform or cage to a variety of positions remote from the support structure and having a first boom pivotally connected to the support structure, a second boom pivotally connected to the free end of said first boom, first hydraulic cylinder means for effecting pivoting movement of said first boom relative to the support structure between a first inoperative position and a variety of operative positions, second hydraulic cylinder means connected with said second boom for effecting pivoting movement of said second boom relative to said first boom, said hydraulic cylinder means being secured to a member which is pivotally connected with said support structure at a position offse

Abstract: An industrial crane has a chassis with a housing mounted on the chassis having a flat, horizontal deck with a central well providing access to a bearing for a rotatable upper works, the bearing being centered on the chassis. The upper works has a portion extending into the well to the bearing. The chassis is supported by four wheels, two of which are on an oscillating axle. The wheels are one size, and extend above the chassis which is between them. The upper works includes a cab, directly over the bearing, a boom support rearwardly of the cab, an engine rearwardly of the boom support, and a lifting boom journalled to the boom support rearwardly of the cab and extending forwardly over the cab. The boom is lifted by a lift cylinder rearwardly of the cab. The boom and the cab, as well as the engine, have their lateral centers in line, along the median plane of the upper works, and the upper works median plane coincides with the chassis median plane when the upper works is forward or rearward.

Abstract: A boom lifting system for a crane of the type having an upright mast and a boom hinged to the mast. The system has a brace extending between the mast and the boom. The brace is pivotally connected to both the mast and the boom and has a hinge dividing it into a short section, connected to the boom, and a long section, connected to the mast. A hydraulic cylinder is pivotally connected to both the boom and the short brace section. Actuation of the cylinder straightens or bends the brace to respectively lift or lower the boom relative to the mast.