Safety interlock and retraction mechanism for clinching,...

Details Safety interlock and retraction mechanism for clinching,... Safety interlock and retraction mechanism for clinching,...

2006-10-03

2006-10-03

Larson, Lowell A. (Department: 3725)

Presses

Safety device

Means to disable or to forestall power to the press

C100S035000, C100S341000, C100S269020, C100S269140, C072S003000, C072S021500, C192S130000

Reexamination Certificate

active

07114436

ABSTRACT:
A safety interlock and retraction mechanism for all types of presses comprising a sensing or activating valve which does not apply full force to a press ram until the ram displaces to the expected work material thickness and a pneumatically operated retraction mechanism which eliminates the need for a return spring. The art differentiates between the thickness of an operator's finger relative to a work material thickness in order to promote safety. The art further provides an increased press ram force by eliminating the return spring force subtracting from the ram force.

REFERENCES:
patent: 2222851 (1940-11-01), MacMillin
patent: 4457418 (1984-07-01), Johnston
patent: 5937694 (1999-08-01), Mueller
patent: 6737765 (2004-05-01), Gharst

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