Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1975-10-14
1977-03-29
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
E21C 1308
Patent
active
040143953
ABSTRACT:
A bit and sleeve have matching tapers and are pressed together so that in a working configuration the external diameter of the sleeve is stretched to slightly exceed the diameter of the bore into which the combined assembly is to be asserted. The sleeve is then partially removed from the bit to relax its external diameter so that the combined assembly can be placed into the bore. The bit and sleeve are then pressed into the working configuration in the bore until the sleeve has expanded radially into tight contact with the inner wall of the bore and the bit has seated itself on the end wall of the bore.
A bit and sleeve assembly are pressed together and have matching surfaces which cause the exterior dimension of the sleeve to exceed that of the bore into which the assembly is to be inserted when the bit and sleeve are combined together in a working configuration. The sleeve and bit matched surfaces, however, are dimensioned to allow the external dimension of the sleeve to shrink to a dimension less than the inner dimension of the bore when the sleeve is partially removed from the bit.
REFERENCES:
patent: 2146995 (1939-02-01), Simons
patent: 3101934 (1963-08-01), Poundstone
patent: 3537539 (1970-11-01), Adcock
patent: 3618683 (1971-11-01), Hughes
patent: 3693736 (1972-09-01), Gardner
patent: 3717209 (1973-02-01), Sheldon et al.
patent: 3749190 (1973-07-01), Shipman
Purser Ernest R.
Smith-Williston, Inc.
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