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:
Apr. 05, 1988
Filed:
Dec. 24, 1984
Robert L Steinbach, Glendale Heights, IL (US);
Chicago Lock Co., Chicago, IL (US);
Abstract
A key is an assembly of a thermoplastic handle and a blade, which are formed separately from each other. The blade is substantially flat, and includes on each of its opposite sides a plurality of parallel longitudinal lands having forwardly-facing bittings thereon, and a plurality of parallel longitudinal grooves which alternate with the lands and space them apart. The bittings serve to engage transverse rows of axially reciprocatable tumblers in a cylinder lock, and the grooves receive lock wards therein, while the distal end of the blade engages the lock to determine the depth of insertion of the key blade. The blade also is provided with a capture pin opening, and with a proximal end structure which cooperates with the handle in assembling the key. The blade is made from a length of bar stock which is rolled in order to form lands and grooves on the sides of a flat strip. The lands preferably project laterally outwardly for different distances, to provide increased security and to increase the number of possible key changes. Thereafter, the bar is stamped to form openings and recesses, and cut into individual key blade blanks. Forwardly facing bittings are provided in the lands of each blank, by milling from a distal end of the blade. The proximal end of the blade is inserted into a pocket formed in the handle and secured by the application of ultrasonic wave energy.