Apparatus and method for forming shiplap duct

Details Apparatus and method for forming shiplap duct Apparatus and method for forming shiplap duct

1989-06-01

1991-01-08

Bilinsky, Z. R.

Cutting

Processes

Plural cutting steps

409293, 144136R, 83875, 8352222, B23D 306

Patent

active

049830813

ABSTRACT:
Apparatus and method of forming shiplap grooves (21, 23, 25, 26 and 28) in a duct board (12) utilizing a square (35) and measuring indicia (39). The apparatus comprises shiplap groove cutting tools (22) and (24) and an angle square (35) comprising a guide leg (37) and a base leg (36) having indicia (39) indicative of the desired dimensions for a resulting shiplap duct. The shiplap groove cutting tools have sleds (57, 67, 58 and 56) which are placed against the guide leg (37) to be guided by the same to produce shiplap grooves (23, 25 and 26). The length of the spacing between the grooves is equal to the indicated indicia (39) for the narrow sleds (57 and 68) or the indicated indicia plus the thickness of the board for the wide sleds.

REFERENCES:
patent: 3605534 (1971-09-01), Barr
patent: 3875835 (1975-04-01), Roberts
patent: 3935767 (1976-02-01), McClay, Jr.
patent: 4379419 (1983-04-01), Woock et al.
patent: 4411183 (1983-10-01), Aver
patent: 4608902 (1986-09-01), Ivey

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