Heavy duty punch

Details Heavy duty punch Heavy duty punch

1990-06-29

1991-09-03

Yost, Frank T.

Cutting

Tool or tool with support

Cutting couple type

83684, 83679, B26F 114

Patent

active

050442449

ABSTRACT:
A heavy duty punch for piercing armor plate and the like has a shank by which the punch may be held when in use and a piercing end projecting axially from the shank. The piercing end terminates in a sharp-edged tip. The tip is connected to the shank by a reduced-diameter portion defined by a curved sidewall extending axially from the tip toward the shank and a straight-sided sidewall extending axially from the curved sidewall toward the shank. The straight-sided sidewall is spaced from the tip a distance slightly greater than the thickness of the workpiece being punched; the diameter of the straight-sided sidewall is slightly less than the diameter of the tip.

REFERENCES:
patent: 826130 (1906-07-01), Vold
patent: 900009 (1908-09-01), Doolittle
patent: 1166613 (1916-01-01), Mackle
patent: 1179476 (1916-04-01), Thomas
patent: 1489881 (1924-04-01), Doolittle
patent: 4273015 (1981-06-01), Johnson
patent: 4526077 (1985-07-01), DeGuvera
patent: 4621556 (1986-11-01), Soltysiak et al.

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