Prop-and-shoe assemblies of self-advancing mine roof-supports

Details Prop-and-shoe assemblies of self-advancing mine roof-supports Prop-and-shoe assemblies of self-advancing mine roof-supports

1975-12-19

1976-10-12

Foss, J. Franklin

Supports

Props and braces

Adjustable length

61 45D, E21D 1544

Patent

active

039853284

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.

REFERENCES:
patent: 3201943 (1965-08-01), Wilkenloh et al.
patent: 3800546 (1974-04-01), Holken
patent: 3813886 (1974-06-01), Alacchi
patent: 3877234 (1975-04-01), Martinko
patent: 3883179 (1975-05-01), Floter
patent: 3885396 (1975-05-01), Snowden

Affiliated with

Also associated with

Rating

Prop-and-shoe assemblies of self-advancing mine roof-supports does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Prop-and-shoe assemblies of self-advancing mine roof-supports, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Prop-and-shoe assemblies of self-advancing mine roof-supports will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-937740