Heavy duty nibbler

Abstract

Abstract A heavy duty nibbler possessing certain improvements over the nibbler tools of U. S. Pat. Nos. 2,888,744, 2,967,355 and others, including a punch that is threadedly seated in a main body part such that it is not necessary to remove any parts when the punch is threadedly withdrawn from the bottom of the main body part. The punch is of half-moon shape so that the punch makes an initial partial cut into the work. The portions of the punch are angularly related such that the punch is divided into an extending leg having a flattened edge and a main stem with an inclined edge, the angle between the flattened edge and the inclined edge lying between 81* and 83*. The heavy duty nibbler tool further includes a bronze guide sleeve that replaces the nosepiece of U. S. Pat. Nos. 2,888,774 and 2,967,355. The bronze guide sleeve will guide the plunger or ram, thereby preventing the punch from running off center. In the present invention the die is provided with ripples to prevent the metal from backing out, and the die holder is provided with a concave surface. Furthermore, the stripper mechanism is adjustable through the addition of stripper plates in 1/16 increments. Thus, the stripper can be adapted for different thicknesses of the work by simply inserting one or more plates in the top of the stripper. Finally, the main driven gear is provided with a series of openings to eliminate backlash.

Inventors

• 👤 I Yermis

Bibliographic Details