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. 03, 1980
Filed:
Jun. 29, 1978
Raymond A Hanson, Spokane, WA (US);
Other;
Abstract
A slipform apparatus is described for forming a continuous upright monolithic lining within a preformed upright shaft. The slipform is provided in three independently movable sections that may be lowered into the shaft. Wet concrete is delivered to the sections and dispensed outwardly of the sections to form the lining. The formed sections hold the wet concrete against the walls of the shaft and progressively form a cylindrical upright bore within the shaft. As concrete is delivered to the slipform, the individual sections are moved in an 'inchworm' effect in conjunction with an expansion mechanism to automatically lift itself upwardly within the shaft as the lining is being formed. A steering mechanism is provided to enable selective angular movement of the slipform in a nonvertical plane.