Method of making expandable and collapsible mandrel

Details Method of making expandable and collapsible mandrel Method of making expandable and collapsible mandrel

1987-09-10

1988-07-05

Briggs, William R.

Metal working

Method of mechanical manufacture

Shaping one-piece blank by removing material

279 1R, 279 2R, B23P 1302, B23B 3140

Patent

active

047545437

ABSTRACT:
An expandible and collapsible mandrel and method of making same are provided wherein such mandrel has a central support and a plurality of longitudinal segments supported for pivoting movements toward and away from the support and the longitudinal segments have circumferentially disposed intermeshing fingers which cooperate to provide a substantially cylindrical supporting outside surface at each of an infinite number of effective diameters and with the supporting surface at each effective diameter being free of longitudinal gaps which extend the full length of the longitudinal segments.

REFERENCES:
patent: 718700 (1903-01-01), Crosby et al.
patent: 1919340 (1933-07-01), Lyford
patent: 2211471 (1940-08-01), Klein
patent: 2264589 (1941-12-01), Ryoquist
patent: 2321146 (1943-06-01), Jones
patent: 2682924 (1954-07-01), Lomazzo et al.
patent: 2690914 (1954-10-01), Bryant et al.
patent: 2753388 (1956-07-01), Buerkas

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