Abstract: A method for forming working fluid passages in a base of a hydraulic jack includes the steps of: (1) forming a supporting rod seat passage by drilling from a lower portion of a check valve seat on the base to communicate with the chamber defined in a lower portion of a supporting rod seat on the base; (2) forming a first connecting passage by drilling from a side surface of a pressure relieve seat on the base to communicate with the supporting rod seat passage; (3) forming a pressure relieve passage by drilling from the side surface of the relieve seat to communicate with the supporting rod seat passage, the pressure relieve passage is substantially parallel to the first connecting passage and disposed between the first connecting passage and the chamber; (4) forming a second connecting passage by drilling from a second side of the pressure relieve seat to communicate with the pressure relieve passage, the first connecting passage transversely communicates with the second connecting passage; (5) forming a mai

Abstract: An electric hydraulic jack/air pump includes a base on which a hydraulic assembly, an air pump assembly, and a transmission assembly are mounted. The hydraulic jack assembly includes a first cylinder for effecting a lifting function upon reciprocating motion of a first piston. The air pump assembly includes a second cylinder for effecting an air-filling function upon reciprocating motion of a second piston. The transmission assembly includes a motor electrically connectable to a power source, a shaft driven by the motor, a wheel eccentrically mounted on the shaft, and a ring securely mounted around the wheel. The first and second pistons are respectively connected to the ring to effect the lifting and air-filling functions.

Abstract: A motor assembly including a motor, a shaft, a gear assembly and an air compressor, encompassed by a vacuum casing and an impeller housing encompassing a number of evenly spaced impellers and impeller casings, the impellers being driven by the shaft of the motor assembly and the air compressor being driven indirectly by the motor through the gear assembly. The motor assembly and the impeller housing and related parts fit in a cylindrical cavity of a body so as to provide suction; high volume, low pressure air compression; and low volume, high pressure air compression. The body has a handle with a light on its front end.