Drilling tool with a two part input unit

Details Drilling tool with a two part input unit Drilling tool with a two part input unit

1976-02-27

1977-08-30

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Core forming type

175320, 173DIG2, E21C 1300

Patent

active

040448452

ABSTRACT:
A drilling tool for use in boring holes is formed of an axially elongated drilling member and a holder or input unit. The input unit laterally encloses the rearward end of the drilling member and is formed of at least two materials, one having a higher thermal conductivity than the other. The higher thermal conductivity material is in contact with the shank of the drilling member and extends radially outwardly to the outer surface of the input unit. The higher thermal conductivity material can have various shapes, for instance, that of a coil, spaced disks, a sleeve with inwardly extending webs or an inner sleeve and an outer sleeve spaced apart and joined by a flange-like web. The second material may be a plastic and can be fixed into holes or openings formed in the first material.

REFERENCES:
patent: 1657387 (1928-01-01), Goldschmidt
patent: 1869892 (1932-08-01), Grove et al.
patent: 2076039 (1937-04-01), Miller
patent: 2260070 (1941-10-01), Wilhilde
patent: 3637033 (1972-01-01), Mayall
patent: 3848931 (1974-11-01), Swisher
patent: 3866692 (1975-02-01), Stelljes

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