Locks – Operating mechanism – Key
Patent
1993-04-30
1995-02-14
Cuomo, Peter M.
Locks
Operating mechanism
Key
70377, 70419, E05B 2908
Patent
active
053884388
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a cylinder lock with detent disks, as defined in the preamble to claim
The typical disk detent cylinder lock of prior art is of the kind which comprises a stationary outer cylinder within which an inner cylinder is disposed. Within the inner cylinder a plurality of detent disks have been arranged to constitute a disk stack, these disks being turnable from their locking positions into the opening positions, using a key. Each detent disk comprises a peripheral notch located on the periphery; a key aperture constituting a key channel; and a tail member located on the periphery, which in cooperation with the inner cylinder turning aperture has been arranged to delimit the path of the disk detent to a given circular sector. Furthermore, the lock comprises a detent bar which in the locked position interlocks the inner cylinder with the outer cylinder. When all detent disks have been turned to be in register with the detent bar, the detent bar is arranged to release the inner cylinder to be free to turn relative to the outer cylinder for opening the lock, in that the detent bar enters the groove constituted by the peripheral notches.
It is a serious problem in disk detent cylinder locks known in the art, that the are comparatively easy to open by various lock-picking methods.
One of these lock picking methods is based on the fact that the individual detent disks of the lock can be moved one by one, independent of each other, into their opening positions, e.g. by turning the detent disks to and fro with a suitable implement inserted through the key channel. It is easy for a person picking locks to acquire a fingertip sensitivity enabling him, when he turns a detent disk, to feel that particular point at which the peripheral notch of the individual detent disk is in register with the detent bar, that is, in the opening position.
The object of the invention is to provide a disk detent cylinder lock which solves this problem.
It is a particular object of the invention to provide a disk detent cylinder lock which cannot be opened with any implements other than the specific key defined for the particular lock.
The disk detent cylinder lock of the invention is characterized by that which is stated in claim 1.
As taught by the invention, the disk detent cylinder lock comprises locking members for mutually interlocking the detent disks in a lock-picking situation in order to prevent lock picking. The lock picking act is prevented in that the detent disks are so interlocked that they cannot be turned to and fro independent of each other in an attempt to find the opening position.
In an embodiment of the lock the locking members include a locking bar axial to the disk stack and connecting two so-called 0 detent disks, and at least on one other detent disk a stop member for interlocking the detent disks in cooperation with the locking bar. A so-called 0 detent disk is understood to be a detent disk which when turning it into the opening position is turned most, i.e., through the whole sector defined by the turning aperture of the inner cylinder.
In an embodiment of the lock the locking bar is arranged to connect the foremost and rearmost detent disk in the disk stack, which disks are so-called 0 disks. The locking bar will then act in cooperation with the stop member on at least one detent disk located between the foremost and rearmost detent disks. Advantageously, every detent disk in this interval carries a stop member, whereby all detent disks are mutually interlocked by effect of the locking bar and of the stop members when the foremost and rearmost detent disk have been turned into a position in which the locking bar and the stop members come into interaction.
In an embodiment of the lock the housing of the inner cylinder comprises a space for movement of the locking bar, and the housing comprises a guiding surface for guiding the locking bar into cooperation with the stop member.
In an embodiment of the lock the guiding surface has been formed so that the locking bar comes into contact wi
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No affiliations
Cuomo Peter M.
Dino Suzanne
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