Method and device for the performance of a supporting function i

Details Method and device for the performance of a supporting function i Method and device for the performance of a supporting function i

1981-09-29

1984-03-20

Ridgill, Jr., James L.

Static structures (e.g., buildings)

With lifting or handling means for primary component or...

Construction or component having means to engage hand or...

E04B 141

Patent

active

044372760

ABSTRACT:
A device for the performance of a supporting function in a passage includes a resilient plug which is expandible to the cross-sectional area of the passage and contractible to a lesser cross-sectional area. Contraction of the plug after its supporting function has been completed permits the plug to be readily withdrawn from the passage. The device is particularly useful for forming a passage in an element composed of a flowable and hardenable material such as concrete. The material is poured around the plug and the plug is contracted and withdrawn from the material once this has hardened.

REFERENCES:
patent: 323022 (1885-07-01), Boone
patent: 1062534 (1913-05-01), Butler
patent: 1963301 (1934-06-01), Gloystein
patent: 2217560 (1940-10-01), Michon
patent: 3013643 (1961-12-01), Perry
patent: 3489312 (1970-01-01), Hunckler et al.
patent: 4017115 (1977-04-01), Holt et al.
patent: 4068879 (1978-01-01), Torbet et al.

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