Presses – Reciprocating press construction – C-frame type
Patent
1975-06-11
1977-04-19
Wilhite, Billy J.
Presses
Reciprocating press construction
C-frame type
100269R, B30B 132
Patent
active
040181502
ABSTRACT:
In a press which comprises an upper frame provided at the forward end thereof with a main cylinder, a lower frame opposed to said upper frame across a vertical spacing and a shank frame attached integrally to the ends of said upper and lower frames so as to provide support therefor and which is adapted to produce pressure for required fabrication by hydraulically actuating said main cylinder, an auxiliary cylinder is incorporated parallel to the main cylinder of the upper frame between the main cylinder and the shank frame and the forward end of the piston of said auxiliary cylinder is fastened onto the lower frame by the medium of a tension bar. The hydraulic actuating fluid is delivered to the auxiliary cylinder through a flow path which branches off from the flow path of said hydraulic fluid to the main cylinder, and the direction in which said fluid is delivered to the auxiliary cylinder is opposite that in which the fluid flows to the main cylinder. When the hydraulic actuating fluid is delivered to the main cylinder to produce pressure for required fabrication, the fluid is simultaneously delivered to the auxiliary cylinder to push up the auxiliary cylinder. This elevation of the auxiliary cylinder serves the purpose of producing a corrective action to minimize possible deflection, i.e. divergence of the forward ends of the upper and lower frames caused by the pressing force generated at the anvil, making it possible to enhance the precision with which desired fabrication by pressing is accomplished.
REFERENCES:
patent: 2296051 (1942-09-01), Pocock
patent: 2580078 (1951-12-01), Denison
patent: 3247783 (1966-04-01), Hammon
patent: 3303774 (1967-02-01), Shiokawa
patent: 3561252 (1971-02-01), Norton et al.
Kelman Kurt
Wilhite Billy J.
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