Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1976-04-01
1978-04-25
Larson, Lowell A.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29DIG32, 277138, 277140, 72177, 72181, 72234, B23P 1506, B21D 5384
Patent
active
040854906
ABSTRACT:
A rolled steel oil control piston ring for internal combustion engines is of generally U-shaped cross section with a pair of opposed rigid sidewalls projecting inwardly of the ring from a central peripheral wall thereof. A pair of flat-faced solid scraper rims formed by closed pleats rolled from the peripheral wall extend outwardly of the ring. The ring is made by rolling flat strip steel stock through a series of profiled rollers by guiding the edges of the stock without deforming the same, while taking up dimensional variations of the stock by displacement of the central portion of the strip. Pleats are formed in the central portion by the profiled rollers and the pleats are closed on themselves to provide the solid scraper rims. An extrusion-like profile-reducing rolling step provides dimensional accuracy to the finished strip which is then punched to provide the vent openings in the peripheral wall, and coiled and cut to form individual piston rings.
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McCormick, H. E., et al., "New Developments in Piston Rings for the Modern Diesel Engine," from Society of Automotive Engineers Paper No. 750769, Sept. 8-11, 1975.
Mayhew Donald J.
McCormick Harold E.
Ott William F.
Prasse Herbert F.
Crane Daniel C.
Larson Lowell A.
Ramsey Corporation
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