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:
Jun. 21, 1977
Filed:
Aug. 26, 1976
William P Ware, Charlotte, NC (US);
Robert D Wheeler, Rock Hill, SC (US);
Thomas Industries of Tennessee, Inc., Matthews, NC (US);
Abstract
Cable pull lines are pneumatically rodded through underground cable housing conduit comprising joined multipassage sections by attaching the free end of the pull lines to individual foam carriers inserted into each passage at one end of the conduit and forcing air through a manifold into said passages behind the foam carriers to simultaneously drive the carriers to the open exit end of the conduit. The pull lines have been previously uniformly wound on a reel and a brake is used to tension the reel as the pull lines unwind therefrom to keep the foam carriers in phase as they advance through the conduit and thereby to prevent air bypassing the leading foam carriers through gaps at the conduit section joints with resultant loss of driving pressure.