Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft
Patent
1974-05-03
1976-03-09
Pinkham, Richard C.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
1375123, 184 14, 184 45R, F16K 1702, F16N 2300
Patent
active
039425967
ABSTRACT:
Disclosed herein for use with earth penetrating tools is an improved lubricant pressure relief system that utilizes a housing adapted for retention within a lubricant containing passage. An interior surface or opening of the housing is exposed to the lubricant in the passage and includes an outlet port which has an elastic pressure responsive valve covering the opening. The valve releases lubricant when a selected pressure is exceeded while excluding the entrance of exterior matter. The valve functions as a secondary pressure relief valve when used in combination with a spring biased pressure relief valve located within the opening of the housing, which is thereby protected from exterior matter and its successful operation assured.
REFERENCES:
patent: 1865231 (1932-06-01), Buck
patent: 2088788 (1937-08-01), Hage
patent: 2306012 (1942-12-01), Campbell
patent: 2630326 (1953-03-01), Bryant
patent: 3298394 (1967-01-01), Chorkey
patent: 3363644 (1968-01-01), Malec
patent: 3384113 (1968-05-01), Pennisi
patent: 3459217 (1969-08-01), Callahan
patent: 3476195 (1969-11-01), Galle
patent: 3511271 (1970-05-01), Pollinger et al.
Felsman Robert A.
Hughes Tool Company
Kramer Arnold W.
Pinkham Richard C.
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