Lubrication – Lubricators – Belt – cable – chain or conveyor
Patent
1982-11-30
1984-10-09
Brown, David H.
Lubrication
Lubricators
Belt, cable, chain or conveyor
118205, F16N 100, F16N 900
Patent
active
044756291
ABSTRACT:
An improved method and apparatus for proportionately metering and selectively applying lubricant to the inner surface of a conduit as a function of the conduit curvature, to facilitate subsequent pulling of cables therethrough, is disclosed. A spreading device, when pulled through "straight" conduit sections, meters and applies lubricant in longitudinally extending spaced strips of uniform thickness around the inner circumference of the conduit. Upon approaching a curvature or bend in the conduit, pulling tension force vectors transmitted to the spreading device in the radial direction tilt the spreading device to non-concentric alignment in the conduit, causing the spreader to disproportionately apply increased quantities of lubricant to that surface of the conduit having a shorter bend radius, where such lubricant is most needed to reduce frictional sidewall forces applied to the pulled cables. When tilted, the spreader simultaneously reduces the amount of lubricant applied to the conduit wall having the longer bend radius, where such lubricant is needed least. The spreading device is of symmetrical construction, having a frusto-conical forward section, a cylindrical trailing portion and a plurality of inclined rib members that perform the lubricant metering functions. The spreader device is sized and configured to provide the desired lubricant application functions. Use of the spreading device and method of this invention enables accurate predictions to be made on the volume of lubricant that will be needed to fully complete a conduit lubrication application, even over conduits of extended length and having multiple curvatures and bends.
REFERENCES:
patent: 3605251 (1971-09-01), Salerno et al.
patent: 3605947 (1971-09-01), Salerno et al.
patent: 3858687 (1975-01-01), Masarky et al.
patent: 4108279 (1978-08-01), Marcell
patent: 4137623 (1979-02-01), Taylor
patent: 4275096 (1981-06-01), Taylor
patent: 4296837 (1981-10-01), Charlton
American Polywater Corporation
Brown David H.
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