The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 1999
Filed:
May. 09, 1997
Applicant:
Inventors:
Robert L Carter, Naperville, IL (US);
George W Carter, Jr, Colleyville, TX (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E05B / ;
U.S. Cl.
CPC ...
70 25 ; 70 23 ; 70 68 ;
Abstract
A tamper resistant combination lock including a housing having a through bore receiving a locking plunger with a plurality of integral-spaced obstructions thereon, the housing having a plurality of transverse slots each receiving one of two identical blocking slides that snap between three distinct positions, one passing the obstructions and plunger, and two blocking the obstructions and plunger. Lock picking is minimized by flexible fingers in the slides that engage the plunger obstructions when the slides are in the plunger passing position to simulate the slide blocking positions as the lock picker tugs the plunger.