FR2664639A1 - Lock having a high load moment - Google Patents

Abstract

The invention relates to a lock of the type comprising a body (1) in which an unlocking rotor (2), subject to a high load moment and cooperating with a key, pivots. The lock according to the invention is characterised in that the head of the rotor (2) is provided with a peripheral profile (4) with which a surface (9), of corresponding profile, of a key body (8) cooperates, a shutter (5) being mounted pivotably in the rotor (2) coaxially to the latter and comprising a peripheral profile (6) identical to that of the rotor (2) head. Application to lock-making.

Description

High resistant torque lock.

The invention relates to a lock of the type comprising a body in which pivots an unlocking rotor subjected to a high resistive torque and cooperating with a key.

Locks of the previous type are generally controlled by a coded key entering a slot in the rotor and cooperating with locking-unlocking members, such as flakes or pistons, to release the rotating rotor. These known locks offer more or less high security depending on their mechanism and their precision, but are vulnerable to dust, objects introduced unintentionally into the key slot such as chewing gum, matches, paper clips, etc.

These objects block the lock, the disassembly of which is complicated and expensive.

Simple locks are also known, controlled for example by a square or a triangle, and which are used in public places to dissuade unauthorized persons from opening the lock. These simple locks offer practically zero security while still being vulnerable to external objects.

The present invention aims to provide a new lock of simple and robust construction, which can be of security, and which is much less sensitive to external objects than known locks.

To this end, the lock according to the invention is characterized in that the rotor head is provided with a peripheral profile with which a surface, of corresponding profile, cooperates with a key body, a shutter being pivotally mounted in the rotor coaxial therewith, and having a peripheral profile identical to that of the rotor head.

The shutter practically prohibits the introduction of objects such as chewing gum, matches, paper clips and thus makes the lock less vulnerable. The profile of the rotor head, and of the shutter, requires the possession of a special key to actuate the rotor, which constitutes security against unauthorized opening.

Advantageously, the key body is tubular, which facilitates its introduction and its guidance.

The key can also include peripheral axial teeth cooperating, in a manner known per se, with axial pistons. It is thus possible to create a high security lock.

The invention will be clearly understood on reading the following description made with reference to the appended drawing in which
Figure 1 is a schematic view in half section and
axial half-elevation, of a lock according to a
exemplary embodiment of the invention; figure 2
is a schematic view along arrow F of the fi
Figure 1, and Figure 3 is a plan view of the key
Figures 1 and 2.

The lock comprises a body 1 in which a rotor 2 journals kept in the locked position by a screw-nut system 3 ensuring a high resistant torque. This system can be replaced by any means ensuring the same result such as friction washer, spring loaded balls, etc.

The head of the rotor 2 has on its periphery a crenellated surface 4. A shutter disc 5, the periphery 6 of which has a crenellated surface identical to the surface 4, pivots in the rotor 2 coaxially with the latter.

The lock is controlled by a key 7 with a tubular body 8, the internal periphery 9 of which has aliasing complementary to that of the surfaces 4 and 6. The shutter 5 prohibits the introduction of foreign objects which would interfere with the operation of the lock.

The surfaces 4, 6 and 9 can have different shapes from that which is represented. They can in particular be irregular to increase the security of the lock.

The shutter 5 is in principle in the position of new reception of the key 7 when the latter has been extracted. If the shutter 5 has rotated, it suffices to push the tubular body 8 around the shutter 5 and to turn the key 7 until it can be pushed deeper onto the head of the rotor 2.

The lock can be completed by known locking members (not shown) such as axial pistons cooperating with teeth or axial notches of the tubular body 8 of the key 7.

Claims (5)

1. Lock of the type comprising a body (1) in which pivots an unlocking rotor (2) subjected to a high resistant torque and cooperating with a key (7), characterized in that the rotor head (2) is provided with '' a peripheral profile (4) with which cooperates a surface (9), of corresponding profile, of a body (8) of key (7), a shutter (5) being pivotally mounted in the rotor (2) coaxially with that -ci and having a peripheral profile (6) identical to that of the rotor head (2). 2. Lock according to claim 1, characterized in that the body (8) of the key (7) is tubular. 3. Lock according to one of claims 1 and 2, characterized in that the peripheral profile (4) of the rotor head (2), the peripheral surface (9) of the body (8) of the key (7) and the peripheral profile (6) of the shutter (5) are regular. 4. Lock according to one of claims 1 and 2, characterized in that the peripheral profile (4) of the rotor head (2), the peripheral surface (9) of the body (8) of the key (7) and the peripheral profile (6) of the shutter (5) are irregular in shape. 5. Lock according to one of claims 1 to 4, characterized in that the body (8) of the key (7) comprises peripheral axial teeth cooperating, in a manner known per se, with axial pistons