Shear-type loader for a tunnel and gallery excavator
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United States of America Patent
Stats
-
May 12, 1987
Grant Date -
N/A
app pub date -
Jan 17, 1986
filing date -
Jan 26, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A loading mechanism operating on a loading apron of a tunnel and gallery excavator or the like comprises an eccentric-carrying crank disk, a crank lever, a shear rake, and a link. The eccentric-carrying crank disk is rotatable about its axis in a single direction of rotation, and the crank lever is connected to an eccentric pivot on the eccentric-carrying crank disk. The crank lever is pivotally connected by a lever arm to the link, which is attached pivotally to the apron behind the eccentric-carrying crank disk with respect to the forward direction of travel of the tunnel and gallery excavator. The shear rake is constructed as a bent lever with a raking arm and a controlling arm and at the vertex of the angle formed between the raking arm and the shear rake is mounted on the eccentric pivot with a vertex joint. A first end of an operating lever is connected to the controlling arm by a first operating lever pivot joint, and a second end of the operating lever is connected in the vicinity of the middle of the link by a second operating lever pivot joint. An improved tunnel and gallery excavator using two of the improved loading mechanisms is also described.
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