Pick-resistant tubular lock and key for operating the same

Details Pick-resistant tubular lock and key for operating the same Pick-resistant tubular lock and key for operating the same

1979-08-13

1981-09-15

Wolfe, Robert L.

Locks

Portable

Padlocks

70398, E05B 6736

Patent

active

042890004

ABSTRACT:
A conventional tubular lock is made pick-resistant by the inclusion of a specially designed washer. The washer, which has a non-circular opening, is provided in the lock interior. The washer is preferably located between the helical compression spring and the rear face of the slidable plunger. The opening in the washer permits the insertion of a specially shaped expandable key, but does not permit the insertion of an old style expandable key, or a nail or other similarly round picking tool which has a sufficiently large diameter to wedge in the rear bore of the plunger. Therefore, the specially designed washer permits the lock to be opened only by an authorized key, but not by a nail or an unauthorized key.

REFERENCES:
patent: 3714802 (1973-02-01), Morse
patent: 3835674 (1974-09-01), Hoyt
patent: 4040279 (1977-08-01), Sigmorelli

Affiliated with

Also associated with

Rating

Pick-resistant tubular lock and key for operating the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pick-resistant tubular lock and key for operating the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pick-resistant tubular lock and key for operating the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-385280