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:
Mar. 26, 1991
Filed:
May. 01, 1989
Applicant:
Inventors:
Harold F Jarvis, Moffat, CA;
Carlos Sinforoso, Rexdale, CA;
Assignee:
Shaw Industries Ltd., Rexdale, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B08B / ;
U.S. Cl.
CPC ...
15 931 ; 15 88 ; 1510404 ; 29 8105 ; 29 8111 ; 29 8113 ;
Abstract
A self-propelled pipe cleaning machine as disclosed for use in removal of deteriorated coatings, such as coal tar or tape, from pipelines and providing a degree of surface preparation suitable for recoating. The machine comprises a travelling frame for motion along the pipe and an oscillating carriage bearing a plurality of counter-rotating cylindrical cutting tools which are urged toward the pipe surface by constant-force pneumatic cylinders. Variation in the pressure of cutters against the pipe surface during oscillation of the cutter head is avoided by counterbalancing of the pivotally-mounted cutters and their associated drive means.