Self-propelled trenching machine

- Midmark Corporation
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Description

FIG. 1 is a perspective view from the left front side of the self-propelled trenching machine showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a front view thereof; and

FIG. 6 is a rear view thereof.

Referenced Cited
U.S. Patent Documents
2874793 February 1959 Wagner
3006427 October 1961 Van Der Lely
3266179 August 1966 Golden
3533311 October 1970 Allds et al.
3750762 August 1973 Eaton
3754341 August 1973 Caldwell et al.
3788415 January 1974 Tilley
3834049 September 1974 Bond
3911602 October 1975 Trevathan
Other references
  • "Model 1500 Trencher", The Charles Machine Works, Inc. May 1978. "Davis Trimline 120", J. I. Case, 1977. Bulletin T2/320, "Arps Model 2000 Trench Devil", Arps Corp. "Ditch Witch C & M", Charles Machine Works, Inc.
Patent History
Patent number: D266765
Type: Grant
Filed: Mar 12, 1980
Date of Patent: Nov 2, 1982
Assignee: Midmark Corporation (Minster, OH)
Inventor: Charles A. Clune (Minster, OH)
Primary Examiner: T. Tung
Law Firm: Biebel, French & Nauman
Application Number: 6/129,522
Classifications
Current U.S. Class: Drilling, Mining, Or Soil Treatment (includes Element) (D15/21); Self-propelled (D15/22)
International Classification: D1504;