Plastic article or earthenware shaping or treating: apparatus – Means withdrawing trowel type shaping member from within...
Patent
1978-07-25
1980-01-22
Lee, Lester L.
Plastic article or earthenware shaping or treating: apparatus
Means withdrawing trowel type shaping member from within...
118105, 249 65, 425 95, 425460, 425469, B28B 732
Patent
active
041848306
ABSTRACT:
The present disclosure relates to a so-called drag trowel which is drawn through a pipe or the like to trowel a layer of mortar or other plastic lining material therein. The trowel is frustoconical, having a small leading end of relatively fixed diameter and a larger trailing end which is adapted to expand and contract in the direction of its diameter. The present disclosure provides a novel means within the trowel for exerting a resilient expansive force thereagainst in a circumferential direction fairly close to the large end of the trowel. The expansion means comprises resilient means extending lengthwise along the inner surfaces of the trowel with means for translating the force of the resilient means to a circumferential expansive force and with means for adjusting the effective force of the resilient means.
REFERENCES:
patent: 2987794 (1961-06-01), Perkins
patent: 3074139 (1963-01-01), Gay
patent: 3105282 (1963-10-01), Perkins
patent: 3257697 (1966-06-01), Ruegsegger
patent: 3257698 (1966-06-01), Ruegsegger
patent: 3257699 (1966-06-01), Ruegsegger
patent: 3334389 (1967-08-01), Matheny
patent: 3619873 (1971-11-01), Perkins
patent: 3966389 (1976-06-01), Shubert
patent: 4067680 (1978-01-01), Perkins
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