Apparatus and process for improved manufacture of shells for tun

Details Apparatus and process for improved manufacture of shells for tun Apparatus and process for improved manufacture of shells for tun

1981-04-23

1983-09-27

Husar, Francis S.

Metal deforming

Tool and/or tool holder

Having unitary tool-face

72482, 72367, 72369, 405136, 405137, 405178, 254359, 254312, 269 481, B21J 1302

Patent

active

044061501

ABSTRACT:
This invention relates to improved apparatus and process for manufacture of tunnel modules and tunnel sections used to build underwater tunnel tubes. A collapsible fixture is situated to roll up flat steel plate into a circular shell for the tunnel modules. A hydraulic cylinder is utilized to adjust the diameter of the fixture without collapsing it, in order to close any gaps between the ends of the plate when it is rolled into a shell.

REFERENCES:
patent: 974288 (1910-11-01), McCarroll
patent: 1340297 (1920-05-01), Schiff
patent: 3109477 (1963-11-01), Avera et al.

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