Abstract: A safety device of a lift for vehicles which has a stopper shaft and a rack to protect accidental fall of cradles of the lift during operations. The stopper shaft is pivoted at one end to an upper frame of the lift with sufficient flexibility for lateral movement, while another free end of the stopper shaft is kept at a resting position on an extension of the rack during the cradles being kept at the lowermost position. The rack is provided with a first guide comprising a vertical member disposed alongside the rack and a slightly inclined flat member under the rack, so that the free end of the stopper shaft moves over the rack without sheering off the course during rise of the cradles, and can be engaged with the rack when the cradles is stopped at a desired raised position. The rack is also provided with a passage for the free end having an inclined surface at one end near the resting position and a second guide mounted thereto to lead the free end on the extension of the rack.

Abstract: Disclosed are a screw body jack which can correct the deformation of a metallic structure with the force derived from screw mechanism and a body jack assembly which makes use of a plurality of body jack elements extending radially from a central bracket piece over an angle of either in excess of 180 degrees or no more than 180 degrees. In the latter case, at least one of the body jack elements is utilized in tension while the others are in compression. The screw body jack may be advantageously utilized in the body jack assembly because of its functionality and simplicity.

Abstract: A warning means for a safety valve of a hydraulic power unit and a hydraulic power unit having the same for use in a lifting jack, a vehicle lift, or the like, are disclosed. When an overload is given to a cylinder chamber of a hydraulic power unit, a safety valve is automatically opened so as to release an oil in the overloaded cylinder chamber back to an oil tank. When the safety valve is opened, a warning means switches on a caution buzzer and a caution lamp to appeal the overload to the senses of eyesight and hearing of a human being in order to prevent an accident to be followed previously. The warning means comprises a reed switch and a magnet adapted to be moved by the oil passed through the safety valve.

Abstract: Disclosed is a garage jack for lifting an automobile provided with an arm lock mechanism which defines two angular positions of the lifting arm so that the lifting arm is prevented from inadvertently falling, for instance, due to loss of hydraulic pressure, below the two annular positions. Since there are two such positions, the safety to the user of the garage jack is enhanced. Furthermore, the arm lock mechanism is highly simple with two engagement means provided on the lifting arm and corresponding two pawls on a rotatable shaft. This arm lock mechanism may be readily deactivated by securing a lock/unlock bar. Additionally, the garage jack is provided with a pair of composite wheels each comprised of a steel wheel and an elastic wheel so that the garage jack may be moved from one place to another very quietly thanks to the elastic wheel and may follow the motion of its lifting head when a load is applied to the lifting head and the elastic wheel has yielded under the load thanks to the steel wheel.

Abstract: A portable hydraulic lifting jack for automobiles comprising a ram cylinder receiving a ram therein, and a plunger cylinder receiving a plunger therein so that the lift head may be hydraulically lifted as the plunger is pumped by a lever, wherein a socket for receiving the lever for activating the plunger is divided into two parts so that the distance between the fulcrum belonging to one of the two parts of the socket and the working end belonging to the other part may be varied according to the need.

Abstract: A vehicle lift having a platform mounted on a base for supporting a vehicle, and having a first link which moves the platform up and down. A table is mounted to the platform and supports the chassis of the vehicle by moving the table up and down by a second link. The table may be movably mounted to the platform and a safety device may be provided for preventing the platform from a sudden fall.

Abstract: A log splitter wherein a wedge having a cutting edge and a hydraulic power unit are arranged on one and the other ends of an I beam horizontally supported by supports, is disclosed. A log to be split is placed on the I beam between the wedge and the hydraulic power unit and is pushed towards the wedge by a ram of the hydraulic power unit. The hydraulic power unit is actuated by either air pump means or manual pump means, or by both the two means in the same time.

Abstract: A mechanical safety device for a lift which comprises a pillar and a carriage having arms for supporting a load, the carriage being moved up and down the pillar by a chain, wherein a pawl pivotally mounted to the carriage is adapted to be pivoted into a latch position wherein it engages with one of slots of a longitudinal slot plate mounted to the pillar, so as to prevent the carriage from filling down, and an unlatch position wherein it does not engage with the slot, and is biased to the latch position by a spring, wherein a lock lever pivotally mounted to the carriage is adapted to be pivoted into an engage position wherein it locks an action plate connected to the pawl in the unlatch position, and a disengage position wherein it unlocks the action plate in the latch position, and is biased to the engage position by a spring, and wherein a push device which is movably mounted to the carriage and is coupled to one end of the chain, pushes the lock lever so that the lock lever may be pivoted into the disengag

Abstract: A hydraulic lifting jack on wheels, comprising a pair of frame plates, an elevator which is pivotally mounted on the frame plates, a lifting saddle arranged in the free end of the elevator, and a hydraulic power unit for lifting the elevator, the lifting saddle having front and rear stop members on its front and rear ends, the front stop member being adapted to move up and down so that when the elevator is raised, the top of the front stop member is beyond the upper surface of the saddle, and when the elevator is lowered onto the bottom, the top of the front stop member is positioned below the upper surface of the saddle.

Abstract: A hydraulic lifting jack on wheels, comprising a pair of frame plates, an elevator pivotally mounted on the frame plates, a lifting saddle arranged in the free end of the elevator, and a hydraulic power unit for lifting the elevator, in which a safety device for the elevator is further provided and comprises a support block member pivotally mounted to the elevator, and step block members, each having stop steps in its front slope surface, secured to the frame plates. The support block member is pivoted by a lever into an engaging or disengaging position wherein the support block member engages or disengages with or from the step block members. When the support block member is positioned in the engaged position, the raised elevator is prevented from falling down by the support block member, the bottom of which is supported by the stop steps of the step block members.

Abstract: A vehicle lift which can be used as either a drive-on type lift or a free-wheel lift in which the vehicle is suspended by its underbody. An underbody support is provided which has foldable legs extending down from it which project through holes in the lift vehicle support ramps. When the lift is being used as a drive-on lift, these legs are folded away, and when the lift is to be used as a free-wheel type, these legs are opened out and hang vertically, in which position the vehicle may be lifted off the vehicle support ramps by lowering them, thus pushing the underbody support upwards via the legs away from the support ramps and lifting the vehicle thereby.

Abstract: A lifting jack is disclosed which is operated by a handle which is pumped up and down in order to lift a lifting platform on which is supported a load. A locking device is provided which, when the handle is pivoted into the fully upright position, automatically locks the handle upright; and which can be released by a simple blow from the foot of the operator.

Abstract: In a lift wherein a carriage is raised up a mast by at least one cable, a safety device is proposed which is attached to the mast and which comprises a push member, which is urged towards the cable so as to press sideways against it, so that if the cable slackens the push member moves sideways, and a safety switch, which is so positioned that when the cable becomes slack the push member in its movement sideways actuates the switch.

Abstract: A swing-arm device for a two-pillar vehicle lift is disclosed, which comprises a first arm fixed pivotally about a vertical axis at its one end to a carriage which rides up and down on a pillar of the lift, and a second arm fixed pivotally about a vertical axis at its one end to the other end of the first arm remote from the carriage, the other end of the second arm remote from the first arm supporting the under side of the vehicle. Further, locking devices are provided which lock the pivoting of the first arm with respect to the carriage, and of the second arm with respect to the first arm.