# US 5,349,830 A · Lock system

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- Number: US 5,349,830 A
- Document ID: US5349830A
- Status: Granted
- Kind: A
- Application number: 07/761,933
- Filed: 1991-09-17
- Granted: 1994-09-27
- Earliest claimed: 1990-01-17
- Inventors: Ernst Keller
- Web page: https://patentgrep.com/patent/US5349830A

## CPC

- E05B 19/0023: {characterized by variation of the contact surface between the key and the tumbler pins or plates}
- E05B 19/0058: {with key bits on at least one wide side surface of the key}
- E05B 27/0053: {for use with more than one key, e.g. master-secondary key}
- Y10T 70/7565: Plural tumbler sets
- Y10T 70/7729: Permutation
- Y10T 70/7864: Cylinder lock type
- Y10T 70/7881: Bitting
- Y10T 70/7893: Permutation
- E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A lock system has lock cylinders (5) in which the rotor (9) is lodged as usual in the cylinder housing, (11) as well as lock cylinders (6) in which the rotor (10) is rotated through 180.degree. about its longitudinal axis relative to the other rotors (9). The security keys for the lock system are flat keys and not turning keys and, in the event that these are priority keys, have two completely independent key codes. The invention also provides a further possibility for increasing the number of variations of the lock and thus for increasing its security.

## Claims

### Claim 1

A lock system comprising;
at least one flat safety key (1), two lock cylinders (5, 6), each of which have at least one rotor (9, 10) with a key channel (7, 8) for introduction of said at least one flat safety key (1), said at least one rotor of a first lock cylinder of said two lock cylinders rotated 180.degree. about an axis of rotation with respect to a first corresponding cylinder housing (11) of said first lock cylinder in comparison to said at least one rotor within a second corresponding cylinder housing (12) of a second lock cylinder of said two lock cylinders when said at least one rotor (9) of said first lock cylinder and said at least one rotor (10) of said second lock cylinder are respectively fixed by lock rows in said first corresponding cylinder housing and said second corresponding cylinder housing,
the lock rows being aligned and the corresponding rotor turnable within the cylinder thereon when the key is introduced into the key channel,
said at least one flat safety key (1) being a non-reversible key having a plurality of bores with one lock code for alignment with the lock rows of said first lock cylinder or with the lock rows of said second lock cylinder,
or having a plurality of bores with two lock codes, one code for alignment with the lock rows of said first lock cylinder and the other code for alignment with the lock rows of said second lock cylinder.

### Claim 2 (depends on 8)

The lock system of claim 8, wherein each of said at least one rotor have different basic codes or lock codes.

### Claim 3 (depends on 1)

The lock system of claim 1, wherein a nonturning key (1) is a superordinated key, and that turning keys are also provided for the lock cylinders as subordinated keys.

### Claim 4 (depends on 1)

A key for a lock system as defined by claim 1, wherein said nonturning key is recognizable as a nonturning key by an asymmetrical shaping of the key head (3).

### Claim 5 (depends on 4)

The key of claim 4, wherein said nonturning key has one or two groups of rows (A, D, E; B, C, F) of bores, each row representing one key code and being disposed along one narrow side (13, 14) of the key shaft (2).

### Claim 6 (depends on 5)

The key of claim 5, wherein at least one group of said two groups includes three rows of bores, wherein one row of bores of said three rows of bores is embodied by edgewise bores, and the other two rows of bores of said three rows of bores are embodied by opposed lateral bores on the wide side faces (15, 16) of the key shaft (2).

### Claim 7 (depends on 4)

The key of claim 4 wherein said nonturning key is a superordinated key and has two independent key codes.