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. 16, 1982
Filed:
Apr. 21, 1980
James W Wise, Woodleaf, NC (US);
Power Curbers, Inc., Salisbury, NC (US);
Abstract
A self-propelled apparatus for extruding and forming a substantially U-shaped concrete lining within a previously dug ditch and including means for accurately controlling the slope or grade of the interior bottom surface of the lining. The apparatus includes a hopper (41) for receiving concrete material and the lower end of the hopper is positioned within the ditch (10) and provided with an open rear end. A forming member (50) is supported for vertical movement at the open rear end of the hopper (41) and the forming member (50) with the sides and bottom of the ditch (10) together define an extrusion opening through which the concrete material passes. Control means (76) is associated with the forming member (50) for vertically adjusting the forming member (50) relative to the hopper (41) so that the slope, grade, or fall of the interior bottom wall (14) of the concrete lining is accurately controlled.