Apparatus for cutting pie-shaped openings in fiberboard duct

Details Apparatus for cutting pie-shaped openings in fiberboard duct Apparatus for cutting pie-shaped openings in fiberboard duct

1982-09-28

1983-10-25

Meister, James M.

Cutting

Means to drive or to guide tool

With tool tensioning means

83 54, 83614, 83618, 83692, 83875, 83917, B23D 2302

Patent

active

044111835

ABSTRACT:
Fibrous board transition parts are produced on the job site from standard lengths of preformed fiberboard duct units. Transition parts are interposed between linear runs of duct pieced together to change direction of the duct work. The transition parts, sometimes referred to as elbows or bends, can be easily fabricated on the job site by modifying standard lengths of preformed linear duct by cutting and removing pie-shaped sections from the duct. The modified duct can be bent inwardly to form a one-piece arcuate transition part wherein the outer wall section remains intact and provides structural strength to the transition part. The seams are secured with structural adhesive tape wrapped around the transition part.

REFERENCES:
patent: 2837160 (1958-06-01), Vera et al.
patent: 3097684 (1963-07-01), Tartz
patent: 3299759 (1967-01-01), Johnson et al.
patent: 3958482 (1976-05-01), Claesson

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