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:
Nov. 03, 1992
Filed:
Oct. 18, 1991
Mitch Mlynarczyk, Chicago, IL (US);
Chicago Lock Company, Chicago, IL (US);
Abstract
A automatic locking and unlocking device for effecting the locking engagement of a lock stud within a stud receiving fixture. The lock device of the present invention is adapted for locking a movable closure member relative to a stationary member, such as a vending machine door to a cabinet, and provides a quick open and quick close locking feature. The locking device includes a lock stud fitted with a t-handle at its outer end, and a nose portion inner end, the nose portion having a pair of opposed pin engagement ledges formed therein adjacent the nose portion, and provided with male threads positioned adjacent to and forwardly of the pin engagement ledges. The stationary member is provided with a stud receiving lock housing which contains a stationary cam sleeve, a rotatable cam sleeve which reciprocates relative to the stationary cam sleeve, and a coupling which is positioned anteriorly of the rotatable cam sleeve. The coupling includes a plurality of ball bearings which operate to grasp the stud in the locking position by engaging male threads of the stud during the locking procedure. The coupling further includes at least one spring loaded pin which operate to engage the pin engagement ledges of the stud such that upon a quarter turn of the stud, the rotatable cam sleeve will cam away from the stationary cam in order to present a relief area for the ball bearings to exit from the male threads and permit the withdrawal of the lock stud from the lock housing. Biasing means are provided for biasingly urging the rotatable cam sleeve relative to the stationary cam, and the coupling relative to the stationary cam such that the two parts may reciprocate relative to the stationary cam.