Joints and connections – Articulated members – Pivoted
Patent
1974-09-05
1977-05-31
Paperner, L. J.
Joints and connections
Articulated members
Pivoted
291484B, 291495PM, 308 72, 308241, B21D 5310, B21K 102, F16C 1106, F16D 112
Patent
active
040266575
ABSTRACT:
Sintered articles characterized by a surface of revolution, such as truncated spherical balls, e.g., plain spherical bearing balls, are provided made by the powder metal compaction and sintering of blanks followed, in the case of ball elements, by densification of the outer spherical surface by mechanical working, such as by roll-forming, the balls so produced being characterized by improved sphericity and dimensional tolerance and improved wear resistance combined with optimum resistance to corrosion. The spherical surface of the ball is substantially free of pores, has a work hardened structure and has a density at and adjacent the surface of at least about 95% of the theoretical density of the metal, the density substantially below the surface being less and ranging to as low as at least about 70% of theoretical density.
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patent: 2365562 (1944-12-01), Koehring
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patent: 3205027 (1965-09-01), Hilton
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patent: 3782794 (1974-01-01), Chmura et al.
patent: 3783794 (1974-01-01), Gopfert et al.
patent: 3874049 (1975-04-01), Ferguson
Beltran Howard
Paperner L. J.
Textron Inc.
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