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:
Oct. 12, 1976
Filed:
Dec. 19, 1975
Hans Bull, Wuppertal, DT;
Hermann Hemscheidt Maschinenfabrik, Bornberg, DT;
Abstract
A prop-and-shoe assembly of an hydraulic self-advancing mine roof-support unit, comprising an hydraulic prop having a bearing member at or near one end which is pivotally supported on a pivot on the shoe and having a tubular portion which slidingly embraces the bearing member, a chamber within the said tubular prop portion which permits longitudinal displacement of the prop with respect to the shoe by the admission of hydraulic fluid under pressure into the chamber, an abutment adjacent the lower end of the tubular prop portion, and a stop face against which the abutment is pushed by hydraulic fluid supplied to the chamber during operation of the assembly so as to bring the prop into a desired position with respect to the shoe.