Punching apparatus and punch

Details Punching apparatus and punch Punching apparatus and punch

1997-07-31

2000-08-29

Bishop, Steven C.

Cutting

Tool or tool with support

Pointed perforators

30366, 8369891, 83929, B26F 114

Patent

active

061091561

ABSTRACT:
A drilling jig has a pyramidal tip, a cylindrical portion, and a proximal end. The pyramidal tip is formed like a polygonal pyramid and each pyramidal face is provided with a concave. The cylindrical portion connecting with the pyramidal tip is formed like a prism and the proximal end is made of a flat plate functioning as a stopper. The drilling jig makes it possible to efficiently recover sodium from a spent NaS cell without greatly damaging the structure of the cell.

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patent: 5587252 (1996-12-01), Tsuchimoto et al.
patent: 5617619 (1997-04-01), Knudson

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