1975-12-03
1978-02-14
Shapiro, Jacob
E21D 1544
Patent
active
040731499
ABSTRACT:
A mine roof support assembly which has a stowage or goaf screen lining pivoted to a floor-engaging sill structure and a piston and cylinder unit arranged between the sill structure and the screen to effect pivoting of the screen. A roof bar is pivotably connected to a bell-crank lever which is itself pivoted to the screen and a stiff rod is pivotably connected to the bell-crank lever and to the sill structure. The rod and bell-crank lever form a control linkage which exerts a compensating effect on the roof bar as the screen is pivoted to move the bar against or away from the roof, so that the bar maintains in horizontal orientation while the front end of the bar moves along a vertical line.
REFERENCES:
patent: 3830070 (1974-08-01), Rosenberg et al.
patent: 3885396 (1975-05-01), Snowden et al.
patent: 3898845 (1975-08-01), Plevak et al.
patent: 3932998 (1976-01-01), Lubojatsky et al.
Gewerkschaft Eisenhutte Westfalia
Shapiro Jacob
LandOfFree
Mine roof support assemblies does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mine roof support assemblies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mine roof support assemblies will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-519045