Percussion drill

Details Percussion drill Percussion drill

1989-03-02

1990-05-08

Yost, Frank T.

Tool driving or impacting

Work cleansing

Cleansing fluid passage through hammer head

173 73, 173 80, 173135, 175 92, B25D 1714

Patent

active

049230182

ABSTRACT:
A percussion drill comprises a drill bit and a reciprocable hammer piston for imparting blows to the bit. Pressurized air is supplied to the piston for reciprocating the piston. Some of the air is by-passed to an exhaust passage and is exhausted ahead of the bit for removing cuttings. An indexable choke valve is disposed in the exhaust passage for regulating the amount of air which is exhausted. The choke valve comprises a portion of a valve carrier which carries a check valve at its rear end. The valve carrier is rotatable to produce an indexing of the choke valve. The valve carrier is insertable in a front-to-rear direction into a central opening of a rear sub and is secured to the rear sub by a pin which also holds the choke valve in selected positions of adjustment.

REFERENCES:
patent: 3431984 (1969-03-01), Buehler et al.
patent: 3503459 (1970-03-01), Schindler
patent: 3912023 (1975-10-01), Amtsberg
patent: 4194581 (1980-03-01), Walter
patent: 4278135 (1981-07-01), Curington
Brochure: Ingersoll-Rand Drilling Equipment, DHD-340A, Valveless Downhole Drill (Form 4512-C), 1987.

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