Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent
1980-11-03
1983-01-18
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
175415, 175315, 175320, 403361, 403378, E21B 1038, E21B 1200
Patent
active
043687890
ABSTRACT:
A drill steel and a drill bit having a tip with a cutting element and a hollow open ended shank forming a polygonal socket which is fitted onto a complementary engagement portion at one end of the drill steel so that rotation of the drill steel rotates the bit. The engagement portion of the drill steel has an axial slot to hold a spring retainer clip with a protrusion. A slot is formed in the shank of the drill bit to receive the protrusion on the spring retainer clip to hold the bit in the axial position on the drill steel. An opening in the shank of the drill bit and a pin extending through the opening and through the axial slot in the engagement portion of the drill steel when a spring retainer clip is not located in the slot. Axial openings in the tip of the drill bit communicate with the socket for the passage of either liquid or compressed air to the cutting element of the drill bit or for creating a vacuum at the cutting element, and an axial passage extends through the drill steel for supplying liquid or compressed air to the socket in the drill bit or for creating a vacuum in the socket of the drill bit.
REFERENCES:
patent: 1136987 (1915-04-01), Wakfer
patent: 2037307 (1936-04-01), Bowman
patent: 2101864 (1937-12-01), McCallum
patent: 2294004 (1942-08-01), Serafino
patent: 2716564 (1955-08-01), Lofqvist
patent: 4083415 (1978-04-01), Kita et al.
patent: 4099585 (1978-07-01), Emmerich
patent: 4190128 (1980-02-01), Emmerich
Baker Paul V.
Orr Thomas M.
Orr . . . Screw Machine Products, Inc.
Purser Ernest R.
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