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:
Mar. 16, 1993
Filed:
Dec. 24, 1991
Shinjiroh Yamane, Kawasaki, JP;
Kabushiki-Kaisha, Tokyo, JP;
Abstract
A magnet card type lock includes an outer case, a slider having a key hole slit formed therein, an engagement member firmly secured to the outer case, a plurality of tumbler holes formed in conformity with a predetermined pattern of arrangement, a plurality of magnet tumblers bridged between the case and the slider, a projection integrated with the slider to be engaged with a locking mechanism and a magnet card adapted to be inserted into the key hole slit of the slider to serve as a fellow key. To prepare a specific key difference among a number of magnet card type locks, a predetermined number of tumbler holes are selected from the tumbler holes which extend at a substantially right angle relative to the slider and the outer case. The magnet card is formed with a pluraltiy of apertures some of which are immovably filled with permanent magnets corresponding to the selected number of tumbler holes. When the magnet card is inserted into the key hole slit of the slider, the magnet tumblers are displaced away from the bridged state so as to allow the slider to be pushed in the downward direction, whereby the lock is released from the locked state. A projection plate including a projection may be slidably inserted between the slider and the case. In this case, a plurality of magnet tumblers and a plurality of pin tumblers are received in the selected number of tumbler holes.