Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent
1979-05-01
1981-04-14
Purser, Ernest R.
Boring or penetrating the earth
With storage means for bit lubricant carried by bit or shaft
With fluid pressure-actuated feed means
175346, E21B 1030, E21B 1024
Patent
active
042614260
ABSTRACT:
A roller reamer-stabilizer tool includes a tubular body having threaded pin and box connectors at each end adapted to be connected in a drill string and providing a fluid passage connecting the upper part of the drill string with the lower part. Rollers having integral pins at their ends are mounted in pockets in the sides of the body. The pins are received in stepped, arcuate cross-section bearing blocks received in correlative sockets in the body at the ends of the pockets. The blocks make an interference fit with the body. Releasing bar access passages allow a releasing bar to be inserted behind each block to drive, wedge, or pry it out. Means is provided to seal and lubricate the full lengths of the pin-block interfaces. The seals are downwardly facing to avoid entrapment of foreign material. The lubrication means includes a reservoir having a flexible wall exposed to pressure outside the tool. The roller pins are locked to the bearing blocks to enable the roller-block assemblies to be handled as unitary subassemblies used to replace worn out subassemblies of existing tools. The locking means at one end includes ball bearings to take axial thrust; at the other end the locking means is releasable to enable the block at that end to shift axially relating to the roller, to accommodate manufacturing tolerances and wear and prevent preloading of the thrust bearings.
REFERENCES:
patent: 2134095 (1938-10-01), Abegg
patent: 2218743 (1940-10-01), Catland
patent: 2498756 (1950-02-01), Harris
patent: 2499916 (1950-03-01), Harris
patent: 3054466 (1962-09-01), Wagnon et al.
patent: 3627068 (1971-12-01), Wagnon et al.
patent: 3907048 (1975-09-01), Gray
patent: 4000783 (1977-01-01), Hug
Conley Ned L.
Favreau Richard E.
Purser Ernest R.
Robinson Murray
Rose David Alan
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