Tool driving or impacting – With indicating or signaling means
Patent
1988-10-12
1990-07-03
Yost, Frank T.
Tool driving or impacting
With indicating or signaling means
173 28, 173163, 173164, F21B 702
Patent
active
049382969
ABSTRACT:
A drill rig assembly adapted to be mounted on a vehicle and having a pivotal link assembly mounted to the vehicle. Attached in slidable relationship to the link assembly is a mast assembly containing feed means and rotary means fully enclosed within the mast assembly. An electronic level within the mast assembly automatically maintains the mast assembly in a predetermined, angular position. The drill rig assembly is capable of drilling either vertically or at selected, incremental angles. The drill rig assembly is designed to be safe in operation and lightweight, while providing performance characteristics of larger drill rigs.
REFERENCES:
patent: 4194579 (1980-03-01), Bailey et al.
patent: 4449592 (1984-05-01), Mayer
patent: 4703811 (1987-11-01), Lam
Fridie Jr. Willmon
Pacer Works, Ltd.
Yost Frank T.
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