FR2776007A1 - ROTATING CANNON LOCK WITH ANTI-CUT-OFF SECURITY DEVICE - Google Patents

Abstract

The lock has a housing (1) enclosing the lock mechanism. A rotary barrel (6) projects outwards from the housing and operates the lock mechanism by a key, and a barrel protector (7) surrounding the sides of the barrel and connected to the housing and having an opening (10) for the key. An axially moving tube (11,12) is fitted between the barrel side wall and the protector, and an ejector spring (19) urges the tube towards the front outer end of the barrel. In the event of the barrel protector being cut the tube is moved outwards by the spring and the lock mechanism is fixed in the locked position by a pin (15) and lever (20).

Description

l

  Rotating barrel lock with anti-safety device

  The present invention relates to a rotary barrel lock comprising a box containing the lock mechanism, a rotary barrel projecting from the box towards the outside for actuating the mechanism using a key, and a barrel protector connected to the trunk and surrounding the barrel laterally and at its end

  exterior front, leaving a key entry clear.

  When such a lock is placed from the inside applied on a door, the barrel more or less exceeds the outside face of the door, depending on the thickness of the latter. If this overshoot is too large, it is possible to cut off the barrel and its protector by

  example using a portable grinder type machine equipped with a

  than abrasive. After cutting, it is possible to remove outwards the

  barrel safety to gain access to the lock mechanism.

  The present invention relates to a rotary barrel lock fitted with a security device which blocks the lock in the closed position.

  if the barrel protector is cut off.

  The rotary barrel lock object of the invention comprises a tube movable in translation between the lateral surface of the barrel and the barrel protector, an ejector spring biasing said tube towards the outer front end of the barrel, and means cooperating with said tube and with the mechanism of the lock so as to lock the latter in the closed position when moving said tube to the outside, under the action of said spring, after cutting off the

barrel protector.

  Said means cooperating with the tube and with the mechanism of the lock can advantageously comprise a lever mounted pivoting about an axis parallel to the axis of the barrel, lever whose first end cooperates with the tube and whose second end comprises a tooth blocking blocking the lock during movement of the tube after cutting the barrel protector. Preferably, a locking spring biases the lever in the

blocking direction.

  According to a preferred embodiment, said means further comprise a pin mounted movable in translation parallel to the axis of the barrel in a fixed inner part of the lock, one end of said pin being applied against the inner end of said tube by the ejector spring, while the other end passes through said fixed inner part and cooperates with the first end of the lever for

  keep the latter out of the locked position.

  Said pin may advantageously comprise an axis passing through the fixed part of the lock and a head bearing against the tube, the spring

  ejector being interposed between said head and the fixed part of the lock.

  To further improve safety, the tube can be advantageously divided into two sections kept at axial distance, one

on the other by a lug.

  Preferably, the section of tube turned towards the outside

has an inner rim.

  This section of tube turned towards the outside can advantageously be produced in the form of a hard metal base, by

carbide example.

  Although the invention is also applicable to locks with a fixed barrel protector, it finds a particularly application

  advantageous on locks with rotating barrel protector.

  Referring to the appended schematic drawings, an illustrative and nonlimiting embodiment will be described below in more detail.

  a lock according to the invention.

  In the drawings: FIG. 1 is a bottom view, partially in section, of a lock according to the invention; Figure 2 is an external view, partially in section along II-11 according to Figure 1; Figure 3 shows the different elements of the

  security of the lock according to figures i and 2.

  The cylinder lock or rotating barrel as illustrated in FIGS. 1 and 2 is a surface-mounted lock, the mechanism of which is enclosed in a trunk 1. In particular, the faceplate 2 which projects from the trunk 1 is recognized. the outer side, that is to say towards the door (not shown) on which the lock is mounted on the surface, from the inner side, as well as the removable sheet 3 by which the trunk 1 is closed on the outer side. The mechanism of the lock is intended to actuate a bolt 4. The lock comprises an inner barrel 5 and an outer barrel 6, the first protruding from the trunk 1 towards the inside and the other towards the outside. The outer barrel 6 is surrounded by a barrel protector 7 connected to the trunk 1 and surrounding the outer barrel 6 laterally and at its outer front end, thanks to an inner rim 8 which delimits

key entry 10.

  In the embodiment shown, the barrel protector

7 is turning.

  The side wall 9 and the rim 8 of the barrel protector 7

  surround the barrel 6 radially and axially at a distance.

  A piece 1 1 in the form of a section of tube with an inner rim is interposed, with axial and angular mobility, in the free end zone of the barrel 6, between the latter and the protector 7, both at the level of the

  side wall 9 and rim 8 of the protector 7.

  Furthermore, a section of tube 12 is interposed with axial and angular mobility between the barrel 6 and the side wall 9 of the protector 7, as far as the trunk 1, the section 12 being kept at an axial distance from the section 1 1 by a lug 13 flat fitted into a notch 14 formed in the section 12 at its end facing the section 1 1 (see Figure 3). The section 12 is pushed towards the section 11 itself pushed against the rim 8 of the protector 9, by a pin 15 which comprises a head 16 with an L-shaped profile and an axis 17 mounted movable in translation in a mounting plate 18 ( lock), a compression spring 19 threaded on the axis 15 being interposed between the head 16 and the plate 18. It is therefore this spring 19 which, by acting on the head 16 of the pin 15, pushes the two tube sections 12 and 11 against the inner rim 8 of the protector 7 of the

outer barrel 6.

  A lever 20 is pivotally mounted around an axis 21 parallel to the axis of the barrel 6 between the plate 18 and the inner face of the boot 1, below the tail 22 of the bolt 4. The lever 20 comprises a lever arm 23 long and a lever arm 24 short. The long lever arm 23 bears against the axis 17 of the pin 15, protruding from the plate 18, and the short lever arm 24 due to the presence of a door at its free end, a tooth 25 which, as much that the arm 23 of the lever 20 bears against the axis 17, is kept out of contact with the tail 22 of the bolt 4. The tail 22 of the bolt 4 has a notch 26 arranged in such a way that when the bolt 4 is in the closed position, the notch 26 is located opposite the

tooth 25 of lever 20.

  A torsion spring not shown may be provided to act on

  the lever 20 in the direction indicated by an arrow 27 in FIG. 2, that is to say

  tell the direction in which the arm 23 of the lever 20 is pushed against the axis 17 of the

pawn 15.

  In the event of an attempt to force the lock by cutting off the part of the barrel protector 7 projecting from the door towards the outside, for example with a view to tearing off the barrel 6, as soon as the stop constituted by the rim 8 of the protector 7 has been removed, the spring 19 pushes outward and ejects the tube section 12, the lug 13 and the tube section 11. The pin 17 of the pin 15 also ejected outwards by the spring 19 releases the lever 20 which pivots in the direction of the arrow 27, so that its tooth 25 penetrates into the notch 26 of the tail 22 of the bolt 4 and blocks this

last in the closed position.

  The lock is thus locked in the closed position.

  It should be noted that the embodiment shown and described has been given only by way of illustrative and nonlimiting example and that numerous modifications and variants are possible in the case of the invention. Thus, the two sections of tube 1 1 and 12, instead of being separated

  by lug 13, could also be made in one piece.

  However, the vacuum between the two sections of tube 11 and 12, due to the presence of the lug 13 which keeps the two sections of tube at a distance, ensures more reliable operation, no metal burr produced during cutting can disturb the proper functioning of the system. The lever 20 and the pin 15 can be replaced by means

  equivalents performing the same functions as these elements.

  The section of tube 11 in the form of a base can be

  advantageously made of hard metal, preferably carbide.

  The invention is also applicable equally to all

  types of rotary barrel locks, for example pump or pin locks.

  Of course, the invention is also applicable to

single revolving barrel locks.

Claims (10)

  1. Rotating barrel lock comprising a chest containing the lock mechanism, a rotating barrel projecting from the chest towards the outside, for actuating the mechanism using a key, and a connected barrel protector to the trunk and surrounding the barrel laterally and at its outer front end, leaving a key entry clear, characterized in that it further comprises a tube (11, 12) mounted movable in axial translation between the lateral surface barrel (6) and the barrel protector (7), an ejector spring (19) urging said tube towards the outer front end of the barrel, and means (15, 20) cooperating with the tube and with the mechanism of the lock so as to lock the latter in the closed position when the tube is moved towards the outside, under the action of the spring   ejector, after cutting off the barrel protector.   2. Lock according to claim 1, characterized in that said means comprise a lever (20) pivotally mounted about an axis (21) parallel to the axis of the barrel (6), lever including a first end (23) cooperates with the tube (6) and the second end (24) of which comprises a locking tooth (25).   3. Lock according to claim 2, characterized in that the locking tooth (25) of the lever (21) cooperates with a notch (26) of the tail (22) of the bolt (4).   4. Lock according to claim 2 or 3, characterized in that it comprises a blocking spring urging said lever (20) in the blocking direction.   5. Lock according to any one of claims 2 to 4,   characterized in that said means further comprises a pin (15) mounted movable in translation parallel to the axis of the barrel in a fixed inner plate (18) of the lock, one end of said pin being applied against the inner end of the tube (11, 12) by the ejector spring (19) bearing against said fixed plate (18) and its other end passing through said fixed plate (18) to cooperate with the first end (23) of the lever (20) to hold the tooth (25) of the latter outside from the blocking position.   6. Lock according to claim 5, characterized in that the pin (15) comprises an axis (17) passing through said plate (18) and a head (16) bearing against said tube (12) and serving as a spring support ejector (19).   7. Lock according to any one of the claims   previous, characterized in that said tube is divided into two sections (11, 12) maintained at an axial distance from each other by a lug (13). 8. Lock according to claim 7, characterized in that the tube section (11) facing the outside side comprises a inner rim.   9. Lock according to claim 8, characterized in that the section of tube (11) facing the outside is constituted by   a hard metal base, for example carbide.   10. Lock according to any one of claims   above, characterized in that the barrel protector (7) is   rotatably mounted in the locker's trunk (3).