Tool driving or impacting – Work cleansing – Cleansing fluid passage in impact transmitting anvil
Patent
1976-10-05
1978-03-21
Hafer, Robert
Tool driving or impacting
Work cleansing
Cleansing fluid passage in impact transmitting anvil
173 73, 173132, E21B 2100
Patent
active
040797937
ABSTRACT:
In one type of pneumatic percussion drilling tool, the pneumatic motor has an anvil-bit which is slidable in the forward end of the motor casing between a normal working position and an abnormal advanced position when the tool is hanging off bottom and the pneumatic fluid is caused to bypass the hammer-piston and blow continuously through the anvil-bit. In order to prevent tapping or chattering of the hammer-piston at such time, as a result of leakage of the pneumatic fluid into the forward working chamber, this chamber is vented by means of one or more passages formed in the surface of the anvil-bit member which are open while the tool is blowing and which are closed in the normal operating position of the anvil-bit member. Since the passages are only in the surface of the anvil-bit member, the structure eliminates the need for special configurations of parts to provide interconnecting recesses and passages as in certain of the prior art.
REFERENCES:
patent: 3180434 (1965-04-01), Vincent
patent: 3198264 (1965-08-01), Oelke et al.
patent: 3595323 (1971-07-01), Schindler
patent: 3924690 (1975-12-01), Shaw
patent: 3986565 (1976-10-01), Atkinson
patent: 3991834 (1976-11-01), Curington
Mosely Neal J.
Wohlfeld William I.
Hafer Robert
Mosely Neal J.
Reed Tool Co.
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