Presses – Reciprocating press construction – Fluid pressure actuation
Patent
1980-04-01
1981-11-24
Meister, James M.
Presses
Reciprocating press construction
Fluid pressure actuation
83320, 83530, 83630, 83632, B26D 726, B23D 2506
Patent
active
043017231
ABSTRACT:
A swinging ram type cutoff press for severing lengths of elongated stock such as tubing is provided of the type in which a ram is supported for swinging movement to operate a cutoff die set. The cutoff press includes a power cylinder combined with a toggle link arrangement to produce the swinging movement of the ram. The relative geometry of the ram link support and the toggle mechanism coupled with the arrangement of the cylinder is such that a complete ram motion cycle is carried out during a single forward or return stroke of the cylinder. The force exerted by the cylinder and toggle mechanism is not resisted either by return springs or the weight of the ram, thereby further maximizing the usable power of the power cylinder. Accordingly, one may reduce the cylinder size requirements for a given application. In addition, the mechanical advantage afforded by the toggle mechanism provides for a maximum force at the ram full down position to maximize the force available for the blade stroke. Cylinder size requirements are further reduced by an alternate form of toggle mechanism which compensates for the fact that the cylinder delivers less force on retraction than on extension of its output shaft.
REFERENCES:
patent: 2433672 (1947-12-01), May
patent: 3288011 (1966-11-01), Borzym
patent: 3340756 (1967-09-01), Mize
patent: 3656392 (1972-04-01), Kryntsky
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