Locks for vehicular antitheft lock system

US4357815A · kind A · utility

Assignee

• Kiekert GmbH & Co. Kommanditgesellschaft · DE

Inventors

• Frank Kleefeldt · Heiligenhaus, DE
• Horst Brackmann · Velbert, DE

Key dates

• Filing date: Jul 30, 1980
• Grant date: Nov 9, 1982
• Expiry date: Jul 30, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T70/7881
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A lock assembly has a tubular secondary lock housing having an inner wall generally centered on an axis and formed with an axially extending and inwardly open groove. A core plug is rotatable in this housing and has a central axially extending and open key-receiving passage. Axially spaced tumblers are exposed at this passage in the plug and are diametrally displaceable therein along a diametral plane between outer positions projecting radially beyond the outer surface and inner positions lying radially within the outer surface. These tumblers are only displaceable into the outer positions when they are radially aligned with the groove and when they are in the outer position and engaged in the groove they block the core from rotating in the housing. The tumblers have respective control edges subdivided at the diametral plane into first edge regions and second edge regions which are out of line with each other. First and second differently bitted keys are engageable in the passage with the control edges of the tumblers. The first key has first bits engageable only with the first regions of the tumbler when the first key is in the passage and the second key is similarly only engageab…