Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1979-12-26
1981-06-23
Novosad, Stephen J.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405297, E21D 1544
Patent
active
042747643
ABSTRACT:
A stabilizing arrangement for mine roof support systems of the type in which a series of support units, each including a transverse beam supported at opposite ends by extensible props, are interconnected by extensible struts in a manner to be self-advancing by alternate retraction of support units from a roof supporting condition and extension of the struts to advance such retracted units relative to others of such units which are in an extended roof engaging condition. The connection of each prop to the beam in a given unit is pivotal to allow deflection of the beam and props of a supporting unit from a normal perpendicular relationship under load. The stabilizing means restores the props and beam to a normal perpendicular relationship for advancing movement of each support unit. The supporting units are further stabilized relative to the struts by prop supporting brackets permitting canting movement of the props from a perpendicular relationship with respect to the struts but maintaining the props in a generally upright position for unit advance.
REFERENCES:
patent: 1781063 (1930-11-01), Jessen
patent: 2795935 (1957-06-01), Fitzgerald
patent: 2795936 (1957-06-01), Blower et al.
patent: 4143991 (1979-03-01), Stafford
patent: 4189258 (1980-02-01), Maykemper et al.
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