FR2696205A1 - Cylinder lock with better resistance to burglary. - Google Patents

Abstract

Cylinder lock with improved burglary resistance, comprising a lock body (5) and, therein, a rotary lock cylinder (6) with a set of locking discs (7) and a substantially locking bar straight (8) which, in its locked position, is partially located in a groove (9) of the inner surface of the body (5) and partially in a groove (10) of the cylinder (6) in order to prevent rotation of the cylinder (6) relative to the body (5). The groove (10) of the lock cylinder (6) has at least one projection (13) extending transversely with respect to the groove (10) and preferably provided at the inner end thereof.

Description

The invention relates to a cylinder lock having better resistance

  for burglary, comprising a lock body and, therein, a cylinder

  rotary lock and a sensitive locking bar-

  rectilinear which, in its locked position, is

  partially located in a groove of the inner surface

  re of the lock body and partially in a groove

  lock cylinder to prevent rotation of the

  liner relative to the lock body, and inside

  of the lock cylinder, a set of lock disks

  which can be brought in by means of the key

  rure to a position in which they allow the mo-

  of the locking bar partially through said cylinder groove to a position

  in which the lock cylinder can rotate relative

worn on the lock body.

  In glass disc cylinder locks

  rotary rusting, targeted by the invention, the burglary resistance has been improved in particular by installation

  different protective plates or analog elements

  gues in front of the locking disc group in order to make it more difficult to reach, in particular at the location of the lock locking bar,

  by drilling Depending on the application, for

  space editions, we use locking bars

  noticeably straight beam also in the lock type

  re aimed by the invention In this case, if the drilling is ef-

  made just at the location of the locking bar

  and if the protective plates, if any, are

  violated, the locking bar can be ex-

  treats the lock in the axial direction and the lock can be opened An object of the invention is to provide a solution which for its part makes it more difficult

  breach of the lock, especially when the tech-

  violation described above is used, in this

  that it prevents the removal of the locking bar

  Another object is to provide a solution to the above problem, which is advantageous from the

  from the point of view of manufacturing and the resulting costs

tent.

  These objectives can be achieved by a dis-

  positive according to which the groove of the lock cylinder has at least one projection extending transversely with respect to the groove and preferably provided in

  the inner end of it, and the glass bar

  rusting has a groove or a hollow respectively

  corresponding mating arranged to cooperate with said sail-

  binds so as to prevent movement of the locking bar in the axial direction out of the groove of the lock cylinder Thus, one cannot remove the bar or the lock from the lock since, in the type of lock concerned, the locking bar is always partially located in said groove of the lock cylinder However, the solution does not interfere in any way with the functioning of the effective lock mechanism

  by means of which the movements of the rod of ver-

  rusting relative to the cylinder occur in the

radial direction of the lock.

  In practice, it is advantageous to provide a

  projection on each side of the groove of the service cylinder

  rure, the projections preferably being positioned opposite one another in the axial direction of the

  groove In principle, we can of course plan more

  several elements of this type successively along the groove The limitations of this arrangement result first of all from the manufacturing technique and the costs

additional trained.

  An advantageous solution is obtained, from the point of view of the manufacturing technique and of the operation,

  when the locking bar has a cross section

  substantially circular, said groove or the like

  then extending around the locking bar.

  In addition to the foregoing, the information

  vention also includes other provisions which

  will derive from the description which follows.

  The invention will be better understood using the

  further description below, which refers to

  appended drawings in which: FIG. 1 is a section through a lock in accordance with the invention, in a certain operating context;

  FIG. 2 is a partial section of a cylinder

  lock dre and a locking bar forming part of the lock of Figure 1; and

  Figure 3 is a section along line III-

III of Figure 2.

  It should be understood, however, that these drawings and the corresponding descriptive parts are given solely by way of illustration of the subject of the invention, of which they do not in any way constitute

a limitation.

  In Figure 1, a cylinder lock

  form to the invention is placed, for example, in

  a housing-like structure 1, only a part of which

  Lement is represented; The housing 1 has a passage

  key 2 through which a key for the cylinder lock

  dre is inserted into the lock The device

  takes other elements 3 and 4 which constitute parts

  opposing burglary by drilling The cy-

  lindre proper comprises a lock body 5 to

  the interior of which is placed a cylinder of rota-

  tif 6 containing a set of locking discs

  which can be turned using the key of the lock.

  The lock mechanism also includes a locking bar 8 which, in its locked position, is

  partially located in a groove 9 of the surface

  of the body 5 and partially in a groove 10 of the lock cylinder 6, thus preventing rotation

  of the cylinder 6 relative to the lock body 5.

  In accordance with the known operating principle of this type of lock, the locking discs 7 can be rotated by means of the key to bring them to a position in which peripheral notches

  formed at the periphery of the discs, and not shown

  tees, define a continuous channel at the point of the

  nure 10 in which the locking bar 8 can

  partially enter in order to release the cylinder

  rure 6 which can then rotate relative to the lock body 5 A cam element 11 fixed to a force transmission part 6 a of the lock cylinder 6 can then rotate correspondingly, so that

  can open the space locked by the cylinder lock

  dre The device of FIG. 1 - also includes an element 12 in the form of a ball opposing the drilling,

  in the inner part of the lock cylinder 6.

  As shown more clearly in the figures

  res 2 and 3, the groove 10 of the cylinder 6 has projections 13 which are located in the inner end of the cylinder 6 The locking bar 8 has a

  groove 14 to receive the projections 13 respectively.

  Thus, the locking bar 8, which is always

  partially located in groove 10, can be

  placed in the radial direction of cylinder 6 as ne-

  stopped for opening and closing the lock mechanism, but axial movements in the direction of groove 10 are prevented As a result, in the case where a hole could be drilled in the lock at the location of the locking bar 8 despite the parts 3 and 4 opposing the drilling, in order to then extract the locking bar 8 out of the lock, said

  elements 13 and 14 prevent this extraction.

  Of course, the elements 13 and 14 can be formed in different ways, they can be located

  at different positions and there may be several.

  The main thing is that they prevent the displacement of the locking bar 8 in its axial direction. As is apparent from the above, the invention is in no way limited to those of its embodiments and of application which have just been described in a more explicit manner; on the contrary, it embraces all the variants which can come to the mind of the technician in the matter without departing from the framework or the

scope of the present invention.

Claims (3)

  1. Cylinder lock with better resistance   resistance to burglary, comprising a lock body (5) and, therein, a rotary lock cylinder (6) and a substantially straight locking bar (8)   which, in its locked position, is partially so-   killed in a groove (9) of the interior surface of the lock body (5) and partially in a groove (10) of the lock cylinder (6) to prevent rotation of the cylinder (6) relative to the lock body (5), and, inside the lock cylinder (6), a set of locking discs (7) which can be brought to the   by means of the key to the lock, at a position in which   the they allow the movement of the locking bar   lage (8) partially through said groove (10) of the lock cylinder (6) to a position at which the lock cylinder (6) can rotate relative to the lock body (5), characterized in that said groove (10) of the lock cylinder (6) has at least one projection (13) extending transversely by   relative to the groove (10) and preferably provided for ex-   inner end thereof, and in that the locking bar (8) respectively has a groove or a corresponding recess (14) arranged to cooperate with said projection (13) so as to prevent displacement   of the locking bar (8) in the axial direction   the outside of the groove (10) of the lock cylinder (6).   2. Cylinder lock according to claim 1, characterized in that a projection (13) is provided on each side of the groove (10) of the lock cylinder (6)   and in that said projections (13) are preferably po-   facing each other in the direction axial of the groove (10).   3. Cylinder lock according to claim 1 or 2, characterized in that the unlocking bar (8) has a substantially circular cross section and in that said groove or the like (14) extends around   of the locking bar (8).