Kelly head for hydraulic mast digger

Details Kelly head for hydraulic mast digger Kelly head for hydraulic mast digger

1979-10-04

1981-04-14

Maslousky, Paul E.

Expansible chamber devices

With axially extending element mounted on working member for...

92250, 92258, 173150, F16J 110, F16J 900

Patent

active

042612519

ABSTRACT:
A hydraulic mast digger has a kelly head with improved retaining and sealing features. The digger is of the type having a kelly with a bearing assembly mounted between the kelly and a bearing sleeve. The bearing sleeve is reciprocally carried in the hydraulic cylinder and moves in response to hydraulic fluid pressure. The bearing assembly allows rotation of the kelly with respect to the bearing sleeve. A cap is secured by threads to the bearing sleeve above the top of the kelly to define a piston. The cap has an upwardly facing shoulder located below the upper edge of the bearing sleeve. A retainer is rigidly secured to the cap and extends down into the space between the cap and bearing sleeve. A locking device locks the retainer to the bearing sleeve. Preferably the locking device includes a key that fits within slots formed on the retainer and bearing sleeve. A primary seal encircles the retainer.

REFERENCES:
patent: Re21677 (1940-12-01), Tremolada
patent: 2598271 (1952-05-01), Klosterman
patent: 2634950 (1953-04-01), Allen
patent: 2803842 (1957-08-01), Fuller
patent: 3525404 (1970-08-01), Newmon et al.

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