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http://miningst.com/longwall-mining/equipment/powered-supports/powered-supports/
Hydraulic powered roof supports are self advancing structures which are interconnected along the length of the longwall face. Each unit along the line is also connected to each pan of the AFC. The function of the powered supports are to: To control strata …
http://www.faqs.org/rulings/rulings1990HQ0084855.html
The literature describes these supports as self- advancing hydraulic 2-leg, 4-leg, and 4-leg chock-type mine roof supports. The supports consist of hydraulic cylinders placed between a steel floor beam and a roof beam containing a steel caving shield. The "legs" are the vertical supports for the overhead shield.
https://www.youtube.com/watch?v=deIPQ6SFnJc
Aug 20, 2019 · A workman is not required to handle the supports during any of these processes, except for guiding the roof bars supported by the hydraulic props. The self-advancing supports …
http://undergroundcoal.com.au/fundamentals/07_equipment_1chock.aspx
Equipment Chocks (also known as "Powered Supports", "Supports" or "Shields") Roof support in early longwalls (in the days of hand mining) was by timber props and bars, withdrawn from the goaf side as the faces advanced and re-used if still intact.
https://digital.library.unt.edu/ark:/67531/metadc67143/m1/21/
Oct 04, 2019 · Report issued by the Bureau of Mines discussing hydraulic-powered roof support specifications. As stated in the abstract, "this report presents observations made by Bureau engineers regarding hydraulic-powered roof supports that are currently being used or have been used on nearly all operating long-walls in the United States" (p. 1). This report includes tables, and illustrations.Author: A. J. Barry, O. B. Nair, J. S. Miller
http://www.freepatentsonline.com/3724329.html
Apr 03, 1973 · This invention relates to a control system for self-advancing hydraulic roof supports for longwall faces in mines. In prior Patent application Ser. No. 719,334 filed Apr. 8, 1968 there is disclosed a system for controlling, from a central control station containing means for generating hydraulic pressure, self-advancing hydraulic roof supports for longwall faces in mines.
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