The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 1993
Filed:
Aug. 17, 1992
Randy J Holloway, Lubbock, TX (US);
Donnie W Hicks, Lubbock, TX (US);
Eagle-Picher Industries, Inc., Cincinnati, OH (US);
Abstract
A trenching apparatus having a digger arm operative to form a trench along a trench line includes a lower end which mounts a digging and propulsion unit having an upper and lower group of sprockets which are vertically spaced from one another and carry chains having digger teeth mounted thereto. Structure is provided to increase the relative spacing between the upper and lower sprockets, while the chains remain in engagement therewith to increase tension in the chains as they wear and a number of scraper blades are mounted in position relative to the sprockets and the shafts which carry them to prevent the buildup of soil, concrete, rocks or other foreign material thereon and thus ensure smooth operation of the digging and propulsion unit.