Mobile rotary drill rig

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Description

FIG. 1 is a right front perspective view of a mobile rotary drill rig showing our new design;

FIG. 2 is a left rear perspective view thereof; and

FIG. 3 is a top plan view thereof.

The broken lines showing of the engine in FIGS. 1 and 2 of the drawing, is for illustrative purposes only.

Referenced Cited
U.S. Patent Documents
D244190 May 3, 1977 Swartz et al.
Other references
  • Drilling, 1/76, P64, Drill Rig, center left side of page.
Patent History
Patent number: D253535
Type: Grant
Filed: Jan 19, 1977
Date of Patent: Nov 27, 1979
Assignee: Chicago Pneumatic Tool Co. (New York, NY)
Inventors: Walter A. Schmidt (Enid, OK), Jack D. Smith (Enid, OK), Jay R. Cory (Enid, OK)
Primary Examiner: James M. Gandy
Attorney: Stephen J. Rudy
Application Number: 5/760,453
Classifications
Current U.S. Class: Drilling, Mining, Or Soil Treatment (includes Element) (D15/21)
International Classification: D1504;