Shear lock keeper ring

Details Shear lock keeper ring Shear lock keeper ring

1984-05-01

1986-04-15

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Miscellaneous

299 79, 299 91, 299 93, E21B 1000

Patent

active

045823642

ABSTRACT:
A shear lock keeper ring is shown for maintaining the shank of a bit in contact with the retaining shoulder in the shank receiving opening of a bit mounting block of the type found on earth working machinery. The keeper ring is formed from a resilient material and has a ring-shaped inner portion which is received about the bit shank within a retaining groove on the shank. The keeper has a resilient outer portion which overlays the inner portion and which is joined to the inner portion at a shearable junction. The outer portion is deformable inwardly toward the inner portion during assembly of the shaft into the block opening. The outer portion is shearable upon opposite relative movement of the shaft in the block opening to disassemble the shaft from the block.

REFERENCES:
patent: 3079582 (1963-02-01), Lazar
patent: 3752515 (1973-08-01), Oaks et al.
patent: 4247147 (1981-01-01), Rettkowski
patent: 4327947 (1982-05-01), Bower, Jr.
patent: 4363160 (1982-12-01), Wibrow
patent: 4484783 (1984-11-01), Emmerich

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