Boring or penetrating the earth – With above-ground means to feed tool
Patent
1989-10-06
1991-05-07
Neuder, William P.
Boring or penetrating the earth
With above-ground means to feed tool
173163, E21B 302
Patent
active
050128787
ABSTRACT:
Drive head apparatus for driving the drill string of a rock boring machine, such apparatus comprising one or two drill string connectors (28) (30) having resilient means such as a coil spring (66) acting therebetween, with respective floating bearings (62) (64) separably secured thereto and with each bearing arrangement comprising respective cooperating, axially fixed bearing seating surfaces (68) (86). Each floating bearing (62) (64) is in the form of a softer metal insert replaceable on the associated connector (28) (30) without replacement of the drill string connector (28) (30). A splined cylindrical drive insert (88) rotatably drives the drill string connector and is separable from the drive body (58) in which it is seated and is axially reversible to swap wear ends or is readily replaceable without need for replacement of the entire drive body (58).
REFERENCES:
patent: 3736993 (1973-06-01), West
patent: 3754605 (1973-08-01), Porter et al.
patent: 3797587 (1974-03-01), Klein
patent: 3800887 (1974-09-01), West
patent: 3802057 (1974-04-01), Porter
patent: 4729260 (1988-03-01), Dudden
The Robbins Company Drawing No. D37724, Sheets 1 through 4 Inclusive, Dated Mar. 6, 1986, Relating to the Robbins' Model 53R Raise Drill.
Neuder William P.
The Robbins Company
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