Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1978-10-16
1981-04-28
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
29445, 29526R, 29560, 29564, 82 1C, 409179, B23P 1900, B23P 2300, B23Q 4100, B23B 300
Patent
active
042637066
ABSTRACT:
A dragline is constructed in the manufacturing plant with a segmented guide rail shimmed and secured to the plates of a tub concentric with the pintle for the deck. The guide rail is then machined so that a rolling surface is created on the rail that is within .+-.0.002 inches of a planar surface. Tub gear segments have mounting portions accurately machined and accurately drilled as are tub rail segments and deck rail segments accurately machined. The dragline is then disassembled, shipped to the site and re-erected with the guide rail shimmed and installed on the plates of the tub so that the rolling surface is within .+-.0.002 inches of a plane. The deck is mounted on the pintle and supported on columns to space the deck rail girder from the tub rail girder. A tram or boom is mounted on the deck pintle and has a machine tool carriage riding on the guide rail so that a milling head on the carriage can mill the upper and lower rail girders to within .+-.0.0025 inches of planar. The tub gear segments are positioned on the lower rail girder wherein the drilled holes in the segments act as a templet for a drilling head on the carriage for drilling the upper and lower rail girders. The boom and carriage are then removed. A tub rail is shimmed and secured to the tub gear segments and to the tub flanged girder to create a tub rail surface within .+-.0.0025 inches of planar. A deck rail is shimmed and secured to the deck rail girder to provide a surface within .+-.0.0025 inches of planar. An interconnected set of flanged dolly wheels are positioned between the deck rail and the tub rail as the deck is lowered into operative position on the tub.
REFERENCES:
patent: 3145622 (1964-08-01), Rust et al.
patent: 3509750 (1970-05-01), Anderson et al.
patent: 3603204 (1971-09-01), Anderson, Sr.
patent: 3687007 (1972-08-01), Harris
patent: 4046035 (1977-09-01), Barber
Moon Charlie T.
Page Engineering Company
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