GB731055A - An improved portable hydraulic press - Google Patents

Abstract

731,055. Assembling force fits. BUTTERY, L. A. June 8,1953 [June 7, 1952], No. 14416/62. Class 83 (4). A portable hydraulic press for inserting liners into cylinders for internal-combustion engines comprises an hydraulic pump 12, an inner pressure cylinder 4, a draw-rod 5 carrying a piston 6 which operates in said cylinder, an outer cylindrical casing 11 surrounding said cylinder to provide an oil storage space between said casing and the cylinder and a flanged cover 8 over the lower end of the cylinder supporting the base of said casing the arrangement being such that in operation the press cylinder slides on the draw-rod and applies pressure to the liner whilst the draw-rod is firmly engaged with the cylinder block. The upper ends of the cylinder and casing are closed by a cover 9, The pump is mounted on the cover 8 and is operated by a pivoted arm 15. Non-return valves are provided for enabling the pump to deliver oil from the storage space to the cylinder and a relief valve, comprising a manually operable plunger 16, is mounted on the cover 8. The draw-rod is of tubular form and is internally threaded for engagement with an inner rod 18 which extends beyond the draw-rod at both ends and is provided at the upper end with a squared head and at the lower end with a forked member 19 supporting a pivoted bearer 20 for engaging the base of the cylinder. In operation, the liner which is placed over the cylinder mouth, is engaged by the underside of the flange of the cover 8 and operation of the pump delivers pressure fluid to the lower part of the cylinder which forces the cover 8 and the liner downwardly, meanwhile oil in the upper part of the cylinder above the piston flows into the storage space through ports 21 and maintains a constant oil level therein. When the liner is in position in the cylinder the relief valve 16 is operated to enable the cover 8 to be lifted and the bearer 20 to be released. Alternatively, the storage space is crescent-shaped and contains the pump. The rod does not extend upwardly beyond the piston and as there is no oil above the piston, the level in the storage space rises or falls according to piston movement.