Implements or apparatus for applying pushing or pulling force – Device or member for contacting and guiding moving cable – Including rotatable – cable contacting – pulley wheel element
Patent
1975-09-26
1977-10-11
Werner, Frank E.
Implements or apparatus for applying pushing or pulling force
Device or member for contacting and guiding moving cable
Including rotatable, cable contacting, pulley wheel element
29726, 214 164R, 214152, 254 93R, 254105, B66F 100
Patent
active
040530620
ABSTRACT:
The invention operates on a bundle of cooling tubes which in use are disposed within a heat exchanger shell which is typically a longitudinally elongated cylinder disposed with its long axis horizontal and supported well above a floor, on a steel framework. The array of tubes become corroded and clogged after a period of use, either internally, externally, or both, and must be pulled linearly out of the shell for replacement. Typically the initial pulling is a difficult job because the tubes have become tightly corroded to the shell.
Herein is disclosed an improvement to the type of tube bundle extractor in which the operative unit is a car movable along a pair of rails supported in alignment with the heat exchanger, the rails being supported on a framework which is usually suspended from a crane hook, the framework being secured to one end of the heat exchanger during a bundle pulling or bundle inserting step.
Whereas in the prior art the bundle of tubes was moved by a linear hydraulic actuator mounted on the movable car, the following specification teaches the use of similar actuators having their cylinders mounted on the framework of the extractor so that their extensible piston rods travel parallel to the path of the car. The actuators move the car through sheave and cable means, and preferably operate oppositely, i.e., when one actuator is pulling the car a paired actuator is following in the opposite direction preparatory to a subsequent pulling step.
REFERENCES:
patent: 2548785 (1951-04-01), Harney
patent: 2595522 (1952-05-01), Harney
patent: 3048280 (1962-08-01), Huff et al.
patent: 3792758 (1974-02-01), Wentz
patent: 3836015 (1974-09-01), Travis
patent: 3935811 (1976-02-01), Lenz
Smith, Jr. Roy H.
Werner Frank E.
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