Back to results
US 4,611,483 AGranted
Press and method of making same
AssigneeRepco Limited
InventorBernard M. Hadaway
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeRepco Limited
InventorBernard M. Hadaway
Estimating the term…
A metal working press having a base, a die set located over the base, and coaxial primary and secondary rams movable towards and away from the base to drive the die set through a working stroke and return it to an open condition. The die set includes upper and lower die assemblies and the upper die assembly is connected to the primary ram in such a manner as to prevent axial separation but permit lateral movement of the die set relative to the ram whereby the die set can be moved into and out of the press. The upper die assembly includes two die members which are relatively movable in the axial direction of the ram and the extent of that relative movement is preset by a lost motion mechanism existing in the connection between the primary ram and the upper die assembly and also by engagement between opposed surfaces of the two rams. An adjustable stop fixes the open position of the die set by cooperation with the secondary ram and a locking mechanism is provided to releasably hold the die set in the open position during removal from and replacement in the press. The rams are mounted in a cylinder which is connected to the base through side plates and each side plate has two part-cylindrical surfaces each of which engages with a complementary surface of the base and cylinder respectively, and those part-cylindrical surfaces are formed about a common axis.
A metal working press including, base, a cylinder supported above said base, a working ram assembly axially movable towards and away from the base and comprising a primary ram and a secondary ram which are arranged substantially coaxial and are movable axially relative to one another, said secondary ram is slidable axially within said cylinder and said primary ram is slidable axially within an axial bore of the secondary ram, a die set located between said base and said ram assembly and being removable from the press to enable replacement by another said die set, said die set including upper and lower die assemblies and means interconnecting those die assemblies so that they are movable towards and away from each other in the axial direction of said ram assembly, said upper die assembly including two die members which are relatively movable in said axial direction and each of which is arranged to be driven towards said base through a working stroke by a respective one of said rams, connecting means including cooperable parts of said primary ram and said upper die assembly which operates to prevent separation of said ram assembly and said die set in said axial direction but allows such separation in a direction transverse to said axial direction so that the die set can be moved into and out of the press in said transverse direction, means releasably retaining said die set against said transverse separation, and three pressure chambers provided within said cylinder, one said chamber is a high pressure chamber and the end of said primary ram remote from said die set is exposed to that chamber, another said chamber is a set and strip chamber and opposed surfaces of said primary and secondary rams which extend transverse to said axial direction are exposed to that chamber, the other said chamber is a die open chamber and a surface of said secondary ram which faces in the opposite direction to said opposed surface thereof is exposed to that chabmer, and said set and strip chamber is located between the other two said chambers.
A press according to claim 5, wherein said vee ring plate includes a projecting rib which is substantially of V shape in transverse cross section and an abutting surface which engages an opposed surface of the lower die assembly to limit penetration of said rib into a work piece interposed between the two die assemblies.
A press according to claim wherein a waste removal blade is operable to sweep across a surface of said die set upon which waste material may lodge, and drive means is operable to move said bar from one side of said surface to an opposite side thereof and then back again.
Dependencies are inferred from the claim text.