Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1981-12-07
1984-07-17
Husar, Cornelius J.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
248357, 254 9R, 254124, B60P 148, B66F 300, E04G 2500, E21D 1544
Patent
active
044602944
ABSTRACT:
A temporary roof support comprising a boom pivotally mounted and positioned on the front of the mining vehicle. A temporary roof support jack is pivotally mounted to the front of said boom. The jack comprises a base structure secured to the boom and extending laterally thereof. The base structure has four pivot pins including an inside pair of pivot pins symmetrically spaced on each side of the base structure and an outside pair of pivot pins symmetrically spaced on each side of the base structure. Two pairs of swing arms are pivoted to said inside pivot pins. Two linkage extensions are pivotally joined to each other and at opposite ends to the free ends of the swing arms. Two extensible hydraulic means are pivotally secured at one end to the outside pivot pins and pivoted at the opposite ends to the swing arms such that the axes of the swing arms and extensible hydraulic means are always crossed. A beam is attached to the pivot joint of the linkage arms for supporting the roof.
REFERENCES:
patent: 1594475 (1926-08-01), Smith
patent: 2764869 (1956-10-01), Scherr
patent: 2929519 (1960-03-01), Taylor
patent: 3642250 (1972-02-01), Klopp
patent: 3715101 (1973-02-01), Puhringer
patent: 4252475 (1981-02-01), Cobb et al.
Cobb William R.
Wehner Dennis J.
Husar Cornelius J.
Schroeder Brothers Corporation
Stodola Nancy J.
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