EXAMINATION OF DISC AND PIN TUMBLER LOCKS FOR TOOL MARKS MADE BY LOCK PICKS

• NCJ Number: 29835
• Journal: Journal of Forensic Sciences Volume: 20 Issue: 4 Dated: (OCTOBER 1975) Pages: 656-667
• Author(s): W G PLUMTREE
• Date Published: 1975
• Length: 12 pages
• Corporate Author: American Soc for Testing and Materials
• Publication Format: Article
• Language: English
• Country: United States of America

Annotation

THIS ARTICLE DEMONSTRATES, THROUGH THE USE OF PHOTOGRAPHS, THE PICK AND WEAR MARKS OFTEN LEFT BY RAKE PICKS MADE FROM CELLULOID, A PAPER CLIP, AND COMMERCIALLY AVAILABLE TEFLON PICKS.

Abstract

LOCK CYLINDERS OF FIVE MANUFACTURERS (ILCO, KWIKSET, SCHLAGE, YALE, ZIPCO), EMPLOYING TUMBLERS OF SEVERAL DIFFERENT COMBINATIONS WERE EXAMINED UNDER A VARIABLE POWER DISSECTING MICROSCOPE. THE CYLINDERS WERE DISSASSEMBLED AND EXAMINED FOR PICK MARKS. THE LOCATION AND APPEARANCE OF THE MARKS ARE DISCUSSED. BRIEFLY MENTIONED ARE THE EFFECTS OF OTHER TYPES OF PICKS AND THE EFFECT OF BALL BEARINGS IN THE PIN WHEELS. REFERENCES ARE PROVIDED.