Improvements relating to metallic stilts for mine arch girders

Abstract

Abstract 406,221. Mine-arch supports. WEMYSS COAL CO., Ltd., and BAIRD, D., East Wemyss, Fife. -Sept. 2, 1933, No. 24388. [Class 20 (ii).] Mine-arch supports of the type wherein the main arched section bar is held betweer other opposed section bars forming a foot, and which are pressed on to its web by an adjustable clamp, has corrugated metal friction material disposed adjacent the web of the main section-bar. The section-bar 3 is held between other section-bars 1, 1, and the friction is adjusted by a releasable clamp 6 and corrugated metal disposed on one or both sides of the web of the main member. The clamp may rest on tapered outer portions 7 of the lower section-bars 1 and be forced downwardly to adjust the friction between the bars.

Inventors

No inventors recorded.

Bibliographic Details