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. 10, 1992
Filed:
Apr. 06, 1990
Otto Tschumi, Frauenfeld, CH;
Sandoz Ltd., Basel, CH;
Abstract
A shotcrete gun having a rotatable multichamber rotor, with a top feed hopper for receiving a dry concrete mixture in a chamber, and a bottom outlet pipe for discharging the dry concrete mixture from the chamber. The outlet pipe having a compressed air connector for connection to a compressed air source. The upper surface of the drum rotor adjoins a gasket having one or more openings fixed to a clamping plate. The lower surface of the drum rotor adjoins a gasket which is fixed to a base plate. The hopper and the outlet pipe being spaced such that a chamber which communicates directly with the hopper can be moved so that it no longer communicates with the hopper but communicates with the outlet pipe. The clamping plate has a compressed air connector for blowing the dry mixture out into the outlet pipe. And an opening for allowing compressed air to escape from the chambers, which opening is located between the position when the chamber communicates with the outlet pipe and the position when it communicates with the hopper outlet. A connection is provided in the upper gasket which connects to at least one chamber empty of concrete and one chamber containing concrete to equalize the pressure between the chambers.