FR2815660A1 - SLIDING LOCK WITH IMPROVED SECURITY - Google Patents

Abstract

A sliding and grooved bolt lock (3) movable against a compression spring (10) comprises a pivoting pawl (13) intended to lock the bolt (3) in the closed position of the lock. The pawl (13) rests on the groove (7) in said closed position of the lock. This pawl (13) performs a complete pivoting after complete descent of the groove (7) following removal of the barrel or similar actuating member from the lock, in order to block the lock in the locking position.

Description

The invention relates to a sliding security bolt lock

improved.

  Sliding bolt locks of this type have a groove which can be moved in translation perpendicular to the direction of sliding of the bolt, against a compression spring, so as to effect a displacement in which the upper end of the groove bypasses a stop secured to the lock box. The groove comprises a member cooperating with the stop integral with the lock trunk. This stop integral with the trunk has a limited resistance and section, which constitutes a risk of break-in during a significant thrust on the bolt in

  the direction corresponding to the sliding return of the bolt in the lock.

  To remedy this drawback, French patent 93.01023 published under the number FR 2.701.055 provides for increased security, by adding a lock to the lock.

  lock pivoting around an axis of the trunk.

  This lock has a conformation which rests on the bolt in the open position of the lock and is braced behind the bolt in the closed position

  of the lock, so as to oppose the return movement of the bolt.

  This bolt slides over the thickness of the bolt when the locking movement of the lock is carried out and falls by gravity behind a recess of the bolt after locking the lock. This lock is then lifted by the groove when

  unlocking of the lock, so as to allow the bolt to retract.

  This device is entirely satisfactory to avoid any risk of break-in during a significant push on the bolt in the direction corresponding to the

sliding return of the bolt.

  However, in the event of rupture of the cylinder for operating the lock, and after removal thereof, there is a risk of lifting the groove, and the lock

  braced behind the bolt, by a tool inserted in the passage of the barrel.

  The invention aims to improve the security of sliding bolt locks, by creating a new simple lock and dimensions comparable to that of the art

  anterior, and avoiding a break-in by passing through the barrel hole.

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  The subject of the invention is a sliding bolt lock with a groove displaceable against a compression spring, comprising a pivoting pawl intended to block the latch in the closed position of the lock, characterized in that the pawl rests on the groove in said closed position of the lock and in that the pawl performs a complete pivoting after complete descent of the groove following removal of the barrel or similar operating member from the

  lock, to lock the lock in the locked position.

  According to other features of the invention: - the groove is retained in the abutment position on the top of the barrel or similar operating member, when the lock is locked using the barrel or similar operating member, - the groove has a raised member guided in a U-shaped cutout, preferably with uneven wings, made in the cover or the lock box, - the groove lifts the pawl during the locking movement; and the pawl descends with the groove, to engage behind a recess practiced on the bolt, so as to make a bracing behind this recess and prevent the retraction of the bolt, - the pawl comprises two substantially flat and perpendicular parts between them , - a pawl part has a large section of width close to the thickness of the bolt, - another pawl part has a curved or circular contour intended to come into abutment against a member secured to the lock safe, - the pawl has a conformation intended to come into abutment against a screw or member (V) integral with the lock box after pivoting (C) complete, - the pawl comprises two pivot pins in two holes in the lock box, - the pawl and the groove are shaped so that the ratchet falls behind the groove after complete descent of the groove following removal of the barrel

or similar operating member.

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  The invention will be better understood thanks to the description which will follow given to

  by way of nonlimiting example with regard to the appended drawings in which: - Figure 1 schematically shows an exploded perspective view

of a lock according to the invention.

  - Figures 2 to 5 schematically represent the operation of a

  lock according to the invention, the cover of which is not shown.

  Referring to Figure 1, a lock 1 according to the invention is driven by an operating member such as a barrel, not shown, and comprises a trunk 2 closed by a cover 2a. The trunk 2 of the lock according to the invention contains a sliding bolt 3 The bolt 3 has a control conformation 4 cooperating with the barrel not shown and a square 6 sliding in a slot 6a in the trunk 2 of the lock. The bolt 3 finally comprises an axis 5 cooperating with a groove 7. This groove 7 comprises a stopper 8 and a housing 9 for a spring 10 mounted in compression between the stopper 8 of the groove 7 and the axis 5 of the bolt 3. The groove 7 has a

  retainer 1 1 able to retain the bolt 3 in the open or closed position of the lock.

  This retaining member 11 is for example a raised portion guided in a conformation 12, for example a U-shaped cutout made in the cover 2a of the boot 2. Preferably, the front branch of the U-shaped conformation or cutout 12 is

  longer than the rear branch of this conformation 12.

  A pawl 13 is pivotally mounted in the manner of a lever around an axis 14 by means of two pins 15a, 1 5b of square section engaged in two holes 1 6a, 16b of the trunk 2. The pawl 13, cut and folded in a metal sheet, contains

  two substantially flat parts 17, 18, folded perpendicular to each other.

  Part 17 of pawl 13 has a large section whose width

  roughly corresponds to the thickness of the bolt 3.

  The part 18 of the pawl 13 has a curved or circular contour intended to come into abutment against a screw or a member V secured to the safe2 of the lock, after complete rotation of the pawl 13 in the direction of the arrow C.

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  Referring to Figures 2 to 5, a lock according to the invention shown in successive operating positions comprises elements identical or functionally equivalent to the elements of Figure 1, identified by numbers

  identical to the reference figures in Figure 1.

  The cover 2a of the lock according to the invention is not shown for the

clarity of the drawing.

  Despite this absence of representation, the path of the member 11 of the groove 7 is imposed by the conformation 12 for guiding the cover 2a as indicated by the

  arrows placed near the retaining member 11.

  The lock according to the invention comprises a barrel 19 fixed in its housing by a screw 20. The actuating barrel 19 comprises a bit 21 controlled

by a key not shown.

  In Figure 2, the lock in the open position has its bolt 3 retained inside the lock by the cooperation of the member 11 with the conformation 12 not shown, while the part 17 of the pawl 13 rests by gravity on the thickness

  bolt 3 with freedom of sliding.

  In FIG. 3, in the initial phase of the closing movement of the lock, the bit 21 of the barrel 19 pushes the groove 7 upwards in the direction of the arrow 23 by compressing the helical spring 10 and lifting upwards l 'member 11 sliding in the conformation 12 not shown, as well as the pawl 13. The pawl 13 raised then rests by its part 17 on the thickness of the groove 7, sliding on the thickness of the groove 7, when the the rotation of the bit 21 is continued in the direction of the arrow 24 corresponding to the locking direction of the

lock.

  In FIG. 4, when the bit 21 has been turned completely in the direction of the arrow 25 and the bolt is locked in the direction of the arrow 26, the groove 7 descends in the direction of the arrow 27 under the action of the compression spring 10 which relaxes after the end of the bit 21 has left the conformation of

command 4.

  In this position, the member 11 of the groove 7, which prevents the retraction of the bolt 3, is retained by the conformation 12 not shown of the cover 2a, without however reaching its lowest point, due to the fact that the groove 7 is retained in the stop position B on the top of the actuating barrel 19, which prevents its complete descent. The pawl 13 falls by gravity, or possibly under the action of a prestressing spring not shown, in the direction of the arrow 28 behind a

  curved recess 29 made on the bolt 3, so as to produce an arc

  buttress behind this recess 29. This bracing of the pawl 13 forming a locking lever is produced by the part 17 engaged behind the recess 29 of the

  bolt 3 in the locked position of figure 4.

  However, the pawl 13 in bracing behind the bolt 3 still rests by its part 17 on the end of the groove 7, sliding over the thickness of the groove 7 which thus prevents the complete pivoting of the pawl 13 in the direction arrow C. When unlocking the lock according to the invention, the movements are reproduced in the opposite direction and the bit 21 raises the groove 7 which in turn raises

  the pawl 13 and thus allows the retraction of the bolt 3.

  However, when the bolt 3 is pressed in the direction corresponding to the sliding 30 of the bolt 3, the retraction of the bolt 3 is prevented by the part 17 of the pawl 13. During an attempted break-in by pressing the bolt, the opposite thrust to

  pawl 13 is cashed by the bracing produced by pawl 13.

  However, after destruction of the central part of the barrel 19, it is possible to introduce a tool through the passage of the barrel 19 in an attempt to raise the groove 7, then attempt to retract the bolt 3 in the inward direction while maintaining the

groove 7 in raised position.

  Thanks to the invention, the destruction of the barrel 19 results in a blocking of the lock according to the invention and prevents the bolt 3 from being driven in the re-entrant direction,

  even in case of barrel rupture.

  In fact, in FIG. 5, in the event of rupture and removal of the actuating barrel 19, the groove 7 which is no longer retained in the stop position B on the top of

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  barrel performs its complete descent, and the member 11 of the groove 7 reaches the point the

  lower of the conformation 12 of the cover 2a.

  The pawl 13, which is no longer supported on the end of the groove 7 after the complete descent of the groove 7 and of the member 11 of the groove 7, falls by gravity, or possibly under the action of a prestressing spring, not shown, in the direction of the arrow C. The pawl 13 is pivoted completely in the direction of the arrow C, to reach the stop position of the curved or circular outline of the part 18

  of the pawl 13 against a screw or a member V secured to the lock2 of the lock.

  The pawl 13 in this stop position constitutes an obstacle which prevents the retraction of the bolt 3, by completely blocking the lock in its locking position. The invention described with reference to a particular embodiment is in no way limited thereto, but on the contrary covers any modification of form and any variant of embodiment within the scope and spirit of the invention, in which a bolt lock sliding comprises an obstacle which prevents the retraction of the bolt 3, by completely blocking the lock in its locked position, in the event of rupture, destruction or removal of the actuating barrel 19 or

similar maneuver.

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Claims (10)

  1. Bolt lock (3) sliding and grooved (7) movable against a compression spring (10), comprising a pivoting pawl (13) intended to come and lock the bolt (3) in the closed position of the lock, characterized in that the pawl (13) rests on the groove (7) in said closed position of the lock and in that the pawl (13) performs a complete pivoting (C) after complete descent of the groove ( 7) following removal of the barrel (19) or operating member   similar to the lock, to lock the lock in the locked position.   2. Lock according to claim 1, characterized in that the groove (7) is retained in position (B) abutment on the top of the barrel (19) or similar operating member, when the lock is locked using the barrel (19) or organ of similar maneuver.   3. Lock according to claim 1 or claim 2, characterized in that the groove (7) comprises a member (11) in relief guided in a cutout (12) in a U, preferably with uneven wings, formed in the cover ( 2a) or the trunk (2) of the lock.   4. Lock according to any one of the preceding claims, characterized   in that the groove (7) lifts the pawl (13) during the locking movement, and in that the pawl (13) descends with the groove (7), to engage behind a recess (29) formed on the bolt (3), so as to make a bracing   behind this recess (29) and prevent the retraction of the bolt (3).   5. Lock according to any one of the preceding claims, characterized   in that the pawl (13) has two substantially flat parts (17, 18) and perpendicular to each other.   6. Lock according to claim 5, characterized in that a part (17) of pawl (13) has a large section of width close to the thickness of the bolt (3). 7. Lock according to claim 5, characterized in that a part (18) of pawl (13) has a curved or circular contour intended to abut against   a member (V) integral with the boot (2) of the lock. 8 2815660   8. Lock according to any one of the preceding claims, characterized   in that the pawl (13) has a conformation (18) intended to come into abutment against a screw or member (V) integral with the boot (2) of the lock after pivoting (C) complete.   9. Lock according to any one of the preceding claims, characterized   in that the pawl (13) comprises two pins (15a, 15b) for pivoting in two   holes (16a, 16b) of the locker (2).   10. Lock according to any one of the preceding claims,   characterized in that the pawl (13) and the groove (7) are shaped so that the pawl (13) falls behind the groove (7) after complete descent of the groove (7)   following removal of the barrel (19) or similar operating member.