Collapsible fixture for manufacture of tunnel tubes

Details Collapsible fixture for manufacture of tunnel tubes Collapsible fixture for manufacture of tunnel tubes

1981-04-23

1983-09-27

Husar, Francis S.

Metal deforming

Tool and/or tool holder

Having unitary tool-face

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

Patent

active

044061510

ABSTRACT:
An improved collapsible fixture for fabrication of tunnel modules and tunnel sections for building underwater tunnel tubes is provided. The fixture has a series of shell-like support members along its length, each member having a stationary base portion, two rotatable side portions and a connecting foldable linkage portion. A common truss is connected to each of the foldable linkage portions and is activated by a plurality of hydraulically operated cylinders connected to the wheel core member of the fixture. In order to collapse the fixture, moveable radial spoke members in the shell-like support members are connected to sliding plate members which are moveably attached to hub plates on the wheel core member.

REFERENCES:
patent: 2878770 (1959-03-01), Work et al.
patent: 3109477 (1963-11-01), Avera et al.

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