Selective cutting (e.g. – punching) – Plural tool fields – With means to select a given field
Reexamination Certificate
2006-10-19
2010-06-01
Ashley, Boyer D (Department: 3724)
Selective cutting (e.g., punching)
Plural tool fields
With means to select a given field
C083S684000, C083S691000, C083S552000, C234S044000
Reexamination Certificate
active
07726554
ABSTRACT:
A multiple punch and multiple die assembly has a workpiece protector which is a punch lifter that is operatively associated with each punch for supporting each of the punches in an inactive position as an active punch is moved by the ram to the active, i.e. operating position to thereby eliminate scoring or marking of the sheet material or other workpiece that is being punched. To eliminate the need for hand tools and hand assembly or disassembly, a manually moveable retainer on the punch assembly is provided that can be moved by hand between a punch-releasing and punch-retaining position for holding the punches within the multi-punch assembly during operation. To prevent stress fractures that formerly occurred in die carriers, support of each die is distributed between two different die components thereby reducing impact stress on the carrier as the ram drives the punch through the workpiece.
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Schneider Joseph C.
Thielges Bruce M.
Ashley Boyer D
Harmon, Sr. James V.
Mate Precision Tooling Inc.
Patel Bharat C
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