Theodore J Wrona

US Patent:

43075991, Dec 29, 1981

Filed:

May 29, 1979

Appl. No.:

6/043373

Inventors:

Theodore J. Wrona - Sturgis MI

International Classification:

B21J 1304
B30B 1504

US Classification:

72446

Abstract:

A spacing adjustment and overload releasing mechanism in a stamping press having a base and a crown spaced from one another and a ram operating therebetween, in which posts interconnect the base and crown and the spacing between the ram and base is adjustable by a nut and collar disposed on opposite sides of the crown, and a fluid operated means such as a hydraulic cylinder for each of the posts disposed in the base applies pressure urging the crown and base toward one another at substantially equal pressures, greater than the normal pressure applied by the ram, but at a pressure sufficiently low that it is within the load capacity of the press frame. The nut and collar provide the initial adjustment between tool sections operated by the ram and base while the fluid operated means provides an overload release in the event excessive pressure is applied by the ram.

US Patent:

41988469, Apr 22, 1980

Filed:

Feb 21, 1978

Appl. No.:

5/879138

Inventors:

Theodore J. Wrona - Sturgis MI

International Classification:

B21J 918
F16H 2300

US Classification:

72450

Abstract:

A stamping press in which a frame supports a ram for reciprocating movement thereof and one or more wobble plates mounted on a main shaft operate a pivoted yoke for reciprocating the ram, and a die section mounted thereon. The ram is normally operated through two complete reciprocating movements for each revolution of the main shaft, and a counter-weight operated by the yoke is preferably included in the press structure for balancing the movement of the ram. The wobble plates may have a means for adjusting the angularity to vary the length of the ram stroke, and the crown of the press is preferably hydraulically separated with respect to the base to provide a safety overload feature and easy access to the work pieces or tooling. In a modification, cams operated by the yoke may be used to drive the ram from the yoke as it is operated by the wobble plate to provide one complete reciprocating movement for each revolution of the main shaft.