Cutlery – Cutting tools – Cold chisels
Patent
1997-01-03
1998-07-28
Payer, Hwei-Siu
Cutlery
Cutting tools
Cold chisels
30315, B26F 100
Patent
active
057847878
ABSTRACT:
A tool used to penetrate ductile sheet metal as the initial penetration in preparation for the attachment or installation of ducting and piping and particularly to forming the initial penetration in sheet metal sheet or ducting from which an opening is made for the attachment of lateral, feed, supply or return duct pipe in heating and air conditioning systems and other process or manufacturing systems employing sheet metal in the system construction. The tool has a shaft with a handle, a top edge and a blade edge with a penetrating point extending from the blade edge. An anvil is affixed to the top edge. A sheet metal workpiece is struck by the tool with the penetrating point causing a penetration in the sheet metal surface in preparation of attachment of ducting or other heating, ventilation and air-conditioning or process systems. A duct opening is then completed by the craftsman hammering the tool by striking the anvil and causing the shaft blade edge to cut the sheet metal or by use of tin snips inserted into the opening made by the initial penetration.
REFERENCES:
patent: 1624853 (1927-04-01), Winter
patent: 2199380 (1940-05-01), Walraven
patent: 2255196 (1941-09-01), Taylor
patent: 4813134 (1989-03-01), Buffin
patent: 5315725 (1994-05-01), Vanden Heuvel
Ivey Floyd E.
Payer Hwei-Siu
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