Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent
1976-03-22
1977-08-23
Leppink, James A.
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
175414, 175422, E21B 1700, E21C 1500
Patent
active
040434095
ABSTRACT:
The shaft of a drill steel for down-hole drills having a longitudinally grooved outside is detachably connected to a bore crown widened out towards the working surface and fitted with flush bores, cavities and hard metal inserts. The bore crown is larger in diameter than the drill steel shaft and is interchangeably secured to it. Form-locking companion parts may be axially and/or tangentially cushioned by elastic material, e.g. by resilient pads located under stress between the lower shaft end and an inner wear bit face. A central passage in said shaft is continued through a central resilient pad that can be made up of two integrally joined parts having different mechanical properties. Preferably, shaft and wear bit have matching disharmonic polygonal profiles. Fastening ring and stop means for the detachable yet secure connection of shaft and wear bit are preferred to use a thread of symmetrical, rounded thread-pitch turning in the same direction as the down-hole drill. A divided fastening or retainer ring facilitates the fitting of the drill steel.
REFERENCES:
patent: 2097030 (1937-10-01), Killgore
patent: 2595962 (1952-05-01), Letts
patent: 2776819 (1957-01-01), Brown
patent: 2802642 (1957-08-01), Feucht
Leppink James A.
Philpitt Fred
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