Metal working – Means to assemble or disassemble – Means to drive self-piercing work part
Patent
1981-02-17
1983-09-13
Combs, Ervin M.
Metal working
Means to assemble or disassemble
Means to drive self-piercing work part
29521, 294321, B23P 1900, B23P 1100
Patent
active
044034091
ABSTRACT:
Apparatus operable to fasten together overlying metal sheets has a cooperating piercing-and-forming punch and die set, which partially sever and displace a localized region of the sheets out of the planes thereof, and a flattening punch which then operates to spread the displaced region sideways and fasten the sheets together with a clenching action. A die mounting for said piercing-and-forming die and a punch mounting for said flattening punch are sequentially and separately operable, respectively, by two hydraulical piston and cylinder arrangements which effect movement thereof relatively to said piercing-and-forming punch. An associated control system comprises pressure sensing devices which sense the operating pressures in hydraulic feeds respectively supplying the piston hydraulic cylinders. These devices are connected to respective level comparators which, when the connected devices sense predetermined feed pressures, provide input signals to a control circuit to initiate sequencing control steps thereof. The control circuit controls solenoid feed valves for the hydraulic cylinders.
REFERENCES:
patent: 2671361 (1954-03-01), Sandberg
patent: 3599318 (1971-08-01), Behlen
patent: 3726000 (1973-04-01), Hafner
patent: 3862485 (1975-01-01), Hafner
patent: 3900937 (1975-08-01), Schleicher
patent: 3934327 (1976-01-01), Hafner
patent: 3981064 (1976-09-01), Hafner
patent: 4041598 (1977-08-01), D'Angelo
patent: 4176441 (1979-12-01), Hafner
Collard Allison C.
Combs Ervin M.
Galgano Thomas M.
L & H Designs Limited
Nichols Steven E.
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