Exhaust means for percussion tool motors

Details Exhaust means for percussion tool motors Exhaust means for percussion tool motors

1974-12-26

1976-10-19

Purser, Ernest R.

Tool driving or impacting

Drive controlled by relative axial movement of tool

Drive motor controlled

85 88, 173 73, 173 78, 173 80, 173132, E21B 2100, F21B 100

Patent

active

039865657

ABSTRACT:
Following is disclosed an improved split-type stop ring having two separable body portions forming an annular composite body with passage means useful with a fluid operated, percussion type drill motor for retaining a drill bit and enabling the by-pass of fluid when the bit is suspended above the bottom of a borehole. Fluid by-pass enables the continued flow of fluid to clean the borehole bottom while stopping the otherwise damaging piston-hammer reciprocation when the bit is suspended above bottom.

REFERENCES:
patent: 626762 (1899-06-01), Leyner
patent: 2210811 (1940-08-01), Kelpsch
patent: 2800884 (1957-07-01), Movi
patent: 2925802 (1960-02-01), White, Jr.
patent: 3164214 (1965-01-01), Oelke
patent: 3198264 (1965-08-01), Oelke et al.
patent: 3599730 (1971-08-01), Luthman et al.

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