Abstract: A leveling and stabilizing system for a carrier having a wheel and axle support supporting a suspension system which in turn supports the carrier body, such as a motor home. Stabilizing units are mounted to be extendable to directly support the carrier body on the wheel and axle support. The stabilizing units are utilized to level the carrier when at a location. The stabilizing units provide a rigid support between the carrier body and the wheel and axle support. The stabilizing units in the preferred embodiment are cylinders mounted to the carrier body and the cylinders have rods or plungers that are extendable to engage pads on the wheel and axle support and are retractable to dis-engage the pads.

Abstract: A compact utility trailer for pick-up and delivery of relatively small sized lots of material is readily towable behind a variety of commonly driven vehicles such as automobiles, pick-up trucks and the like, and contains a hand operated hydraulic jack-operated forklift that allows a pallet of material to be easily seized and lifted into a transport position within the confines of the trailer. The trailer comprises a front end hydraulic jack-mounting portion, and a rear end pallet-housing portion affixed thereto within which a pallet is to be seized and transported. The front end hydraulic jack-mounting portion has a longitudinal member having a trailer hitch fixture. A floor is affixed to the front end portion, and a hydraulic jack is mounted to the floor. A driven piston of the jack is vertically translatable to engage a fork lift-translating lever unit, which is coupled to a fork lift frame supported in the rear end portion of the trailer.

Abstract: A telescoping assembly includes an inner tubular member and an outer tubular member, each defining an internal passage. The inner and outer tubular members are mounted to each other for telescoping movement therebetween, and a pair of coaxial springs are mounted within the internal passages defined by the inner and outer tubular members. The springs act to bias the tubular members toward a retracted position. The tubular members are movable to an extended position against the force of the springs, by introduction of pressurized fluid into the internal passages defined by the inner and outer tubular members. A valve is mounted to an end of one of the tubular members, for introducing pressurized fluid into the internal passages defined by the tubular members, and for allowing fluid to be expelled therefrom under the force of the springs, for allowing the inner and outer tubular members to move to their retracted position.

Abstract: A lifting platform for motor vehicles consisting of a least one lifting cylinder arranged in a covered pit at whose upper end supporting elements for the motor vehicle are attached, a high-pressure unit for supplying pressurized oil to the lifting cylinder and a guide bushing for the lifting cylinder attached to supporting frame anchored in the foundation of the pit. A central rod mounted on the bottom of the pit projects into the lifting cylinder and is sealed with respect to the lower end of the lifting cylinder by a ring gasket and its upper end face forms a pressure face. In the inside wall of each guide bushing there is at least one lubricating channel which is in flow connection with the pressurized oil return line with each lowering stroke of the lifting cylinder or the lifting platform.

Abstract: A motion control system for hydraulically operated lifting devices. The system provides for the dynamic weighing of a loaded container by controllably directing hydraulic flow through a bypass chamber of a two-way valve. An analog output signal is generated by a hydraulic pressure transducer fluidly communicating with the two-way valve or by a tensiometer mounted on the arms of the lifting device. The two-way valve further provides a second bypass chamber which receives fluid under gravity from the lift circuit line of the hydraulic cylinder for controllably lowering the lifting device. The pressure transducer or tensiometer generate an analog signal proportionate to the weight being lowered and whereby the hydraulic fluid is returned to the reservoir of the hydraulic system independently and downstream of the main operating valve.

Abstract: A hydraulically-operated support device for semitrailers is disclosed comprising a hydraulic cylinder semitrailer support and a pump subassembly having three independently operable pumps for generating and controlling the hydraulic operating pressure. The hydraulic cylinder semitrailer support has an extending piston in an extending cylinder, in the bottom end of which is formed a load-raising cylinder for a load raising-piston. A first annular space is formed between the extending piston and the extending cylinder and a second annular space is formed between the load-raising piston and the load-raising cylinder. The annular spaces allow application of pressure in the retraction direction. The pump subassembly comprises an extending pump acting on the extending piston, a load-raising pump acting on the load-raising piston and a retracting pump acting on the annular spaces.

Abstract: A vehicle leveling and stabilizing apparatus particularly adapted for use with a motor home to level and stabilize the vehicle upon irregular terrain preparatory to camping or such activity. The apparatus includes a plurality of jack stand assemblies, one associated with each vehicle quadrant. The jack stand assemblies are operated by double-acting hydraulic power units operable from the cab of the vehicle. Level sensors are connected to the motor vehicle to indicate level or off-level condition from front to rear and from side to side. A control panel within the vehicle carries the power unit controls and level indicators lamps.

Abstract: Disclosed is a system including two or more fluid pressure piston-and-cylinder assemblies. The cylinders are linked in pairs so that retraction of both piston rods reduces the length of the pair of assemblies to the length of a single assembly. Operation of both pistons in a pair provides an effective stroke twice the length of a single assembly stroke. In a particular embodiment, a double cylinder system is used as a pickup system for elevating equipment along a mast in a well workover rig.

Abstract: A portable workover rig for handling a pipe string in a well casing includes a base platform and a collapsible mast which is movable from a reclining transport position to an erect elevated position of use. The mast is supported for free-standing operation by a carriage assembly including a cantilever support base mounted on the base platform for pivotal movement from the transport position to the position of use. The carriage assembly includes lift arms coupled in parallel relation intermediate the cantilever support base and the rig support platform for maintaining the cantilever support base in parallel alignment with the base platform. Hoisting and snubbing operations are performed by drawworks including a linear hydraulic actuator carried on the base platform, a traveling block supported for vertical movement along the mast by hoist and snub cables, and traveling sheaves carried by the actuator through a stroke pathway which is oriented transversely with respect to the mast.

Abstract: Elevating means for use with a wheelchair said means being adapted to be secured to the side frames of the wheelchair and having hydraulically actuated lifting means which when operated extend downwardly to engage the ground and lift the side frames of the chair upwardly.

Abstract: A hydraulic drive for operating an elevator and disposed inside the elevator shaft on one side of the load-lifting member of the elevator comprises a hydraulic ram cylinder having two straight cylinder portions connected by a portion forming an arcuate bend. One straight cylinder portion extends up the path of ascent of the load-lifting member of the elevator, whereas the other straight cylinder portion slidably contains a hydraulic ram piston attached to one end of a universally flexible thrust-transmitting strand. The other end of the flexible strand is attached to a cylindrical body arranged to slide up and down said one straight cylinder portion and is provided with a carrier arm projecting to the outside through an axial slot in said one straight cylinder portion for supporting the load-lifting member of the elevator.

Abstract: An extendible tower is disclosed and includes a plurality of nestable tower sections that may be raised from a telescoping, nested position to an extended position and support a load thereat. A plurality of inverted hydraulic cylinders are located within the tower sections and are also nestable in a collapsed position. Upon receipt of hydraulic pressure, the cylinders move upwardly and extend the nested tower sections. In this regard, the hydraulic cylinder group is secured at opposite ends to a base and to the upper tower section with no securement intermediate along the length thereof. Each hydraulic cylinder and each tower section is provided with means to couple the particular section or cylinder to the next adjacent section or cylinder so as to permit continued raising thereof.

Abstract: Concrete structures including horizontal structures such as slabs, sub-beams and main beams and vertical structures such as internal walls, external walls and columns are broken by a static load applied to the concrete structure by a loading member of a static loading means, which causes bending stress to build up in the concrete structure and finally brings about breakage of the structure. The static load may be applied by hydraulic means, preferably mounted on a movable vehicle.