Rock-drilling bit for percussion hammers

Details Rock-drilling bit for percussion hammers Rock-drilling bit for percussion hammers

1977-06-29

1979-05-01

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175 92, 173 32, E21C 1300

Patent

active

041518896

ABSTRACT:
A rock drilling bit for a pneumatic percussion hammer has a bit head and an anvil extending up from the bit head and slidable in the bit drive sub of the hammer. So the bit will be rotated with the hammer without unduly stressing the anvil, the upper part of the bit head is of non-round cross-section and slidable in a socket of corresponding cross-section in the bit drive sub. If the anvil is not integral with the bit head, but is screwed into it, the lower part of the anvil is of matching non-round cross-section so torque applied by the rotating hammer is applied equally to anvil and bit head.

REFERENCES:
patent: 1136545 (1915-04-01), MacDonald
patent: 3059619 (1962-10-01), Beaumont
patent: 3269470 (1966-08-01), Kelly, Jr.
patent: 3618683 (1971-11-01), Hughes
patent: 3693736 (1972-09-01), Gardner
patent: 3735820 (1973-05-01), Curington
patent: 3771612 (1973-11-01), Adcock
patent: 3952819 (1976-04-01), Adcock

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