FR2550817A1 - LOCK WITH SAFETY BLOCK AND FIXING RING - Google Patents

Abstract

THE LOCK INCLUDES A SECURITY BLOCK WITH ROTOR 1 AND STATOR 2, A FIXING RING 4 SURROUNDING STATOR 2 AND ASSOCIATED WITH THE STATOR DURING THE ROTATION OF ROTOR 1 FOLLOWING THE INTRODUCTION OF THE KEY C, A CYLINDRICAL CAM 6 TO LOCK 60 , AND A LATCH 7 COOPERATING WITH THE ERGOT 60. THE INVENTION AIMS TO PREVENT ANY OPENING DURING FORCED ROTATION OF THE SAFETY BLOCK. TO THIS END, THE LOCK INCLUDES MEANS 24, 42, 44 TO RELEASE THE ROTATION OF STATOR 2 IN RING 4 UNDER THE ACTION OF A ROTATIONAL FORCE EXERCISED AT LEAST ON THE STATOR, AND MEANS 3, 8, 25 , 62 TO ENGAGE ROTOR 1 WITH CAM 6 DURING ROTOR 1 ROTATION UNLOCKED STATOR 2 AND TO DISENGAGE ROTOR 1 FROM CAM 6 DURING ROTATION OF STATOR 2 LOCKED TO ROTOR 1.

Description

LOCK WITH SAFETY BLOCK AND FIXING RING

  The present invention relates to a lock comprising a central rotor suitable for receiving a key, a stator surrounding the rotor and locked to the rotor by locking means in the absence of a key, a fixing ring surrounding the stator and integral with the stator for 5 the rotation of the rotor which is unlocked from the stator by the locking means following the introduction of the key, a cylindrical cam with lug rotating at the rear of the rotor and the stator, and a cooperating pin

  with the lug and translatable by the rotation of the cam.

  In locks of this type with safety block and fixing ring, the fixing ring is firmly anchored to the palastre of the trunk of the

  lock containing the bolt mechanism, and the stator is also firmly anchored to the ring by small screws In other locks of a similar type, the ring is absent and the stator is directly fixed at the back, c 6 tee inside, on the front face of the palaster 15 also by small screws.

  A common method of burglary consists in destroying the means of fixing, such as screws, of the stator by rotating the safety block comprising the rotor and the stator locked to each other by glitter or pins When the front face of the stator protrudes with respect to the external face of a door, the destruction of the fixing means can be easily obtained using a robust clamp in which the external projecting part of the safety block is clamped which is then subjected to forced rotation When the stator does not protrude from the external face of the door, the forced rotation of the stator is obtained by inserting a blade into the entry hole of the rotor key The blade fitted with a lever is subjected alternating rotation causing the

  forced rotation of the rotor and therefore of the stator locked to the rotor.

  In all cases, the forced rotation of the stator destroys the means

  fixing relative to the fixing ring or the palastre of the lock.

  Another method of breaking in to obtain forced rotation of the stator consists in piercing or destroying the rotor and / or the stator with

  suitable means such as metal drills.

  -2 In safety block locks, the cam is securely fixed to the rear of the rotor Forced rotation of the stator secured to the rotor

  therefore entralne the translation of the bolt and the opening of the door.

  The object of the invention is to provide a lock with retaining block and fixing ring which remains closed under the action of a rotation.

  forced from the retaining block and particularly from the stator.

  To this end, the invention relates to a lock as defined in the entry into material, characterized in that it comprises means for releasing the rotation of the stator in the ring under the action of a rotational force exerted at least on the stator, and means for engaging the rotor with the cam during the rotation of the unlocked rotor of the stator and for disengaging the rotor from the cam during the rotation of the

stator locked to rotor.

  Thanks to the means for releasing the rotation of the stator in the ring, any break-in carried out as described above with a view to obtaining the opening leads to a vacuum rotation of the safety block. In this case, the means for engaging and disengaging separate the rotor and cam, and the cam remains stationary and therefore does not drive the bolt in translation. During normal opening by means of the introduction of the key into the rotor, the locking means are actuated by the key and allow the rotation of the rotor in the stator. The stator then remains stationary in the fixing ring by means to release, such as a ball insertable in a recess of the stator and pushed by a spring housed in the ring The rotation of the rotor causes the engagement of a sliding member intermediate with the cam and therefore the rotation of the cam and the translation of the bolt The intermediate member is however disengaged from the cam when the lock is closed, and any rotation

  force of the rotor does not stress the rotating cam.

  Other advantages and characteristics of the invention will appear

  more clearly on reading the following description of several preferred embodiments of the invention with reference to the accompanying drawings

  correspondents in which: FIG. 1 is an exploded view of the front of a lock according to the invention with a bolt controlled by a turn of the key; FIG. 2 is a view in axial section of the front of the lock shown in FIG. 1; Fig 3 is a schematic rear view of the lock shown in Fig 2, in the keyless closed position; Fig 4 is a schematic rear view of the lock shown in Fig 2, after insertion of the key and rotation of the rotor; Figs 5 A to 5 D are schematic rear views of the lock shown in Fig 2, at different stages of opening for a turn of the key; Fig 6 is a schematic rear view of a lock with a cam with two slots to provide an increased possibility of locking by two turns of the key; Figs 7 A to 7 D are schematic rear views of the lock shown in Fig 2, at different stages of a forced rotation of the stator; Fig 8 is a schematic rear view of a lock with a cam with two slots, two sliding fingers and two diametrically opposed stator teeth for double clutch during a turn of the key; Fig 9 is a perspective view of a cam with two pins 20 cooperating with a bolt with two grooves according to the known method called "lantern"; Fig 10 is an exploded view of the front of another lock according to the invention, having a fixing ring accessible from the outside and a stator completely enclosed in the fixing ring; Fig It is an axial sectional view along the line XI-XI of Fig 12, from the front of the lock shown in Fig 10; and Fig 12 is a rear view of the lock shown in Figs 10

and 11.

  The first embodiment illustrated in FIGS. 1 and 2 relates to a lock mounted on a door leaf B, comprising a safety block with rotor 1 and stator 2 having coplanar front faces visible from the outside. The rotor 1 is a cylindrical central barrel threaded concentrically from the front into the internal bore 20 of the stator. According to the embodiment illustrated, the locking of the rotation of the rotor 1 in the stator 2 is achieved by pairs of pins 21 and pistons or # also called needles 10 aligned along a generatrix of the bore 20 For each pair, a spring 22 is housed in a diametral hole of the stator 2 and pushes the respective pin 21 against the respective piston 10 in the rotor 1 As is known, when the key C with a notch of the lock is introduced into the entry slot of the rotor 1, the junction plane of the pin 21 and of the piston 10 of each pair is aligned along said generator of the bore 20, which allows the rotation of the rotor 1 in the stator 2 by rotation of the key C. Other known types of means for locking the rotor relative to the stator can be envisaged, such as for example those with

glitter for symmetric key.

  The rotor 1 is stationary in the axial direction thanks to a front flange 11 of the rotor which is housed and pressed into a circular counterbore 15 formed in the front face of the stator 2, and thanks to a cylinder 3 whose front face is applied coaxially against the coplanar rear faces of the rotor and stator The front faces of rotor 1 and stator 2 are also coplanar and are only visible on the outside. Screws 30 pass through the cylinder 3 and 20 are screwed into tapped holes 12 made in the rear face.

  from rotor 1 to fix cylinder 3 to rotor 1.

  The lock also comprises a fixing ring 4 embedded from the rear, on the inside, in the door leaf B The stator 2 has at the rear a circular base 23 whose shoulder abuts 25 against a corresponding internal shoulder 40 of the rear bore 41 of the ring 4 First means helping to prevent any break-in by forced rotation of the safety block are provided at the rear base 23 of the stator 2 These first means comprise a spring 42 which is housed in a blind hole internal diametral 43 formed in 30 the rear base of the ring 4, and a ball 44 pushed by the spring 42 against a recess in a spherical cap 24 at the periphery of the rear base 23 of the stator 2 The rear face of the ring 4 is fixed to the palastre 50 of the box 5 enclosing the bolt mechanism of the lock by means of screws 45 passing through the palastre and screwed into holes 35 tapped 46 of the base of the ring 4 The palastre 50 is fixed to the face

  inside of leaf B by screws (not shown).

  -5 At the periphery of the rear face of the base of the stator 2 projects a small substantially parallelepipedal tooth 25 which axially overhangs the cylinder 3 The heights in axial direction of the tooth 25 and of the cylinder 3 are equal, which makes it possible to interpose in the large 5 rear bore 41 of the ring 4 a disc 6, called a cam, between the rear face of the cylinder 3 and of the tooth 25 and the front face of the palaster 50 pierced with a circular hole 51 having a substantially smaller diameter to the external diameter of the cam 6 A cylindrical lug 60 projects on the rear face of the cam 6, parallel to the axis of the lock The lug 10 60 passes through the hole 51 of the palastre 50 as well as a vertical oblong light 70 formed in the tail of a bolt 7 or of a support with multiple translatable bolts perpendicular to the axis of the lock

in box 5 of the lock.

  Second means also helping to prevent any break-in by forced rotation of the safety block and intended to transform the rotational movement of the rotor 1 into the translational movement of the bolt 7 are provided at the level of the cylinder 3 These second means mainly comprise a finger monoblock 8 formed by superposition of a front rectangular tongue 80 and a rear rectangular tongue 81 having large diametrically superimposed axes and short plane sides 82 coplanar The length and width of the front tongue 80 are respectively greater than those of the rear tongue 81 The two other small c 6 tees of the tongues 80 and 81 are terminated by points 83 and 84 The front tongue 80 is slidably mounted in a front blind diametrical groove 31 formed in the cylinder 3 A spring 85 housed in the bottom of the groove 31 is applied against the small c 6 tee 82 of the finger 8 and applies the pointed end 83 of the tongue e front against the surface of the rear bore 41 of the ring 4 or against the tooth 25 of the stator 2 30 projecting into the bore 41 In parallel with the groove 31, a diametrical blind rear groove 32 is formed in the cylinder 3 to 1 rear of the groove 32 and receives the rear tongue 8 I, the major part of which is housed in a bore 61 of the cam 6 The thickness of the rear tongue 81 is substantially equal to the sum of the heights 35 of the cam 6 and the groove 32 The length of the rear tongue 81 is less than the diameter of the bore 61, which makes it possible to maintain the tongue 81 inside the bore 61 without contact with the latter when the tip 83 is against the tooth 25 The finger 8 can thus slide diametrically in the cylinder 3 at the rear of the safety block but is rotated by the rotor 1 and the cylinder 3 secured. On the other hand, the cam 6 having an external diameter of the order of diameter of bore 41 of ring 4 can rotate freely t between the palastre 50 and the rear face of the cylinder 3, when the rear tongue 81 is contained in the bore 61 The rotation drive of the cam 6 and therefore the translation drive of the bolt 7 are obtained 10 when the tip 84 of the rear tongue 81 is embedded in a pointed diametrical slot 62 formed at the periphery of the bore 61, following the application of the tip 83 of the other tongue 80 against

the bore 41 of the ring 4.

  The operation of the lock is now described.

  In the absence of the key C in the rotor 1, the pins 21 are partly in the rotor 1 and partly in the stator 2 and the junction planes of the pins 21 and the pistons 10 are not aligned along said generating the bore 20 of the stator As shown in Figs 3 and 5 A, the finger 8 is aligned diametrically with the tooth 25 which pushes the tip 83 against the force exerted by the spring The tip 84 of the- front tongue 81 is therefore in bore 61 of

  the cam 6 and is distant from the clutch slot 62.

  The introduction of the key C in the rotor 10 causes the alignment of the junction planes of the pins 21 and of the pistons 10 with said generator of the bore 20, which disengages in rotation the rotor 1

  and the stator 2 The rotation of the key causes the rotation of the rotor 1 while the stator 2 remains immobilized by maintaining the ball 44 in the recess 24 of the stator by the thrust exerted by the spring 42 The stator is therefore kept fixed to the ring 4 and therefore to the box 5 30 of the lock.

  The rotation of key C and rotor 1 according to the arrows indicated

  in Figs 4 and 5 A to 5 D, causes the rotation of the cylinder 3 and therefore of the finger 8 whose tip 83 leaves the tooth 25 to be applied against the bore 41 of the ring 4 under the action of the spring 85 ( Fig 5 B).

  Simultaneously, the tip 84 of the rear tongue 81 is embedded in the slot 62 of the cam 6, which engages the rotor 1 and the cam 6 La

  rotation of the cam 6 with the rotor 1 leads to the engagement of the lug 60 in the lumen 70 according to a known method, and thus to the translation of the bolt 7 At the end of a rotation of the key (Fig. 5 D), the tip 83 is pushed back by the tooth 25, and the tip 84 5 is simultaneously released from the slot 62, which disengages the cam 6 and the bolt 7 relative to the rotor 1 and to the cylinder 3.

  Turning the key in the opposite direction causes the bolt to return 7

following a similar process.

  The bolt stroke can be limited by means of appropriate stops 10 fixed in the lock box in order to avoid desynchronization between the translation of the bolt 7 and the rotation of the rotor i when a second turn of the key is effected. with reference to FIG. 5D, if a second turn takes place, the tip 84 slides against the bore 61 of the cam 6 after the tip 83 is pushed back by the tooth 25, which disengages the cam 6 from the rotor 1 again allow a rotational securing of the cam 6 and the rotor 1 during a second turn of the key, it is provided in conjunction with new stops limiting the stroke of the bolt, a second slot 63 in the cam 6 in advance of the first slot 62 in the direction of rotation, as shown in FIG. 6. 20 At the end of the first round, after the tip 83 has been pushed back by the tooth

  , the tip 84 fits into the second slot 63, which again engages the rotor 1 with the cam 6 to make a second turn The distance between the slots 62 and 63 is of the order of magnitude of the average width of the tooth 25 having a trapezoidal cross section 25 of preference.

  In the event of an attempted forced rotation of the rotor 1 held integral with the stator 2 by locking the pins 21 in the absence of a key, the rotation force causes the ball 44 to be released from the recess 24 and consequently the rotation of the stator 2 in the fixed ring 4 As shown in Figs 7 A to 7 D, the rotor 1 has not undergone any rotation in the stator 2 and the tip 83 of the front tongue 80 remains permanently applied against the tooth 25 during the entire rotation of the stator in the ring 4 Under these conditions, the rear tongue 81 rotates in the bore 61 of the cam 6 without the tip 84 fitting 35 into the slot 62, which keeps the cam 6 at rest and avoids any engagement of the lug 60 in the lumen 70 of the bolt 7 in the closed position. In addition, the fact that the sirness block 1-2 rotates in the ring 4

  does not allow destruction of the block of serity by drilling.

  According to another embodiment shown in Fig 8, a double clutch is produced by replacing finger 8 with two identical fingers 8 a and 8 b similar to finger 8 Fingers 8 a and 8 b slide in opposite diametric directions in the grooves 31 and 32 of the cylinder 3 under the action of a central spring 85 ab Front points 10 83 a and 83 b of the fingers 8 a and 8 b cooperate with friction respectively with diametrically opposed teeth 25 a and 25 b and protruding from the rear side of the stator 2 The rear tips 84 a and 84 b of the fingers 8 a and 8 b are suitable for fitting into slots 62 a and 62 b

  diametrically opposite in the bore 61 of the cam 6.

  According to another embodiment shown in Fig 9, the cam 6 has two diametrically opposite pins 60 a and 60 b which cooperate alternately with vertical grooves 70 a and 70 b formed in the tail of the bolt 7 according to the known assembly called "lantern" Under these conditions, a single turn of the key allows the bolt to be advanced over a stroke 20 equal to that of the bolt obtained for two turns of the key according to the

realization shown in Fig 6.

  According to another embodiment shown in Figs 10, 11 and 12, the lock is intended in particular for furniture doors or automobile doors. In Figs 10 to 12, elements similar to those illustrated in Figs 1, 2 and 8 are indicated respectively by the same

  reference signs marked with an accent.

  As shown in Fig 11, the front faces of the rotor 1 'and of the fixed ring 4' are coplanar and are only visible on the outer side. Indeed, the shoulder 40 of the bore 41 of the ring 4 30 in Fig 2 is replaced by a front shoulder 40 'of the bore 41' of the ring 4 'which abuts the front face of the stator 2' The stator 2 'is completely contained in the ring 4' between a front base of the ring 4 'surrounding the flange 11' of the rotor 1 'and the cam 6'

  extending the rear face of the ring 4 '.

  The ring 4 'has a smaller thickness here. The blind hole 43 for accommodating the spring 42 according to FIG. 2 is replaced by a similar blind hole 43' made in the body of the stator 2 'in which a spring 42' pushes the opposite from the axis a ball 44 'insertable in a housing in a spherical cap 24' formed in the internal bore 41 'of

the ring 4 '.

  For this type of lock, a hollow cylindrical drum 9 is fixed around the rear of the fixing ring 4 'by means of a diametrical screw 90 In the bottom of the drum 9 is formed a light in 10 semicircle 91 receiving the lug 60 'of the cam 6' which cooperates with a corresponding pin (not shown) The cam 6 'is housed in the blind bore 92 of the drum 9 between the rear face of the ring 4' and the bottom of the bore 92 The entire safety block enclosed in the ring 4 'and the drum 9 is held at the door by clamping between a front flange 47' of the ring 4 'and a threaded ring 48' screwed to

the periphery of the ring 4 '.

  In Figs 10 to 12, the cam 6 'has two slots 62 a' and 62 b ', the stator 2' has two teeth 25 a 'and 25 b', and the cylinder 39 supports two fingers each having a front tongue 80 a ', 80 b' and a rear tab 81 a ', 81 b', in a manner analogous to the embodiment

shown in Fig 8.

R E V E N D I C AT I O N S

  1 lock comprising a central rotor (1) suitable for receiving a key (C), a stator (2) surrounding the rotor and locked to the rotor by locking means (10, 21, 22) in the absence of a key, a fixing ring (4) surrounding the stator (2) and integral with the stator during the rotation of the rotor (1) which is unlocked from the stator by the locking means following the introduction of the key (C), a cylindrical cam (6) with lug (60) rotating at the rear of the rotor and the stator, and a bolt (7) cooperating with the lug (60) and translatable by the rotation of the cam (6), characterized in that it comprises means (24, 42, 44) 10 for releasing the rotation of the stator (2) in the ring (4) under the action

  a rotational force exerted at least on the stator, and means (3, 8, 25, 62) for engaging the rotor (1) with the cam (6) during the rotation of the rotor (1) unlocked from the stator ( 2) and to disengage the rotor (1) from the cam (6) during the rotation of the stator (2) locked to the rotor (1).

  2 Lock according to claim 1, characterized in that the means for releasing the rotation of the stator comprise an element (44, 44 ') such as a ball, sliding against the external periphery of the stator (2), respectively the internal periphery of the ring (4 '), during the rotation of the stator (2, 2') and embedded in a recess (24, 24 ')

  at the outer periphery of the stator (2), respectively at the inner periphery of the ring (4 '), when the stator (2, 2') and the ring (4, 4 ') are joined together, under the action a spring (42, 42 ') housed in a blind diametric hole (43, 43') of the ring (4), respectively of the stator (2 ').

  3 Lock according to claim 1 or 2, characterized in that the means for engaging and disengaging include a finger (8) diametrically sliding in a rear part (3) of the rotor (1), engaged under the action of a second spring (85) with the cam (6) during the rotation of the rotor alone (1) and when the ring (4) and the stator (2) are secured, and disengaged from the cam (6) by a tooth ( 25) at the rear of the stator (2) against the second spring (85) during the

  rotation of the stator (2) locked to the rotor (1) in the ring (4).

  4 Lock according to claim 3, characterized in that the finger (8) comprises a front tongue (80) having one end (83) applied by the second spring (85) against a bore (41) of the ring (4 ) containing the stator (1) during the rotation of the rotor alone (1) or against the tooth (25) of the stator (2) during the rotation of the stator (2) locked to the rotor (1) in the ring (4) , and a rear tongue (81) recessed under the action of the second spring (85) in a slot (62) of a bore (61) of the cam (6) during the rotation of the rotor alone (1) or rotating in the bore (61) of the cam (6) during the rotation of the

  stator (2) locked to the rotor (1) in the ring (4).

  Lock according to claim 4, characterized in that the bore (61) of the cam (6) comprises a second slot (63) suitable for embedding the rear tongue (81), at a distance from the first slot (62) substantially equal to the width of the tooth (25) of the

stator (2).

  6 Lock according to claim 4, characterized in that the finger (6) is replaced by two diametrically opposite fingers (Sa, 8b) on either side of the second spring (85 ab) each having a front tongue ( 80 a, 80 b) and a rear tongue (81 a, 81 b), in that the tooth (25) of the stator (2) is replaced by two diametrically opposite teeth (25 a, 25 b) cooperating simultaneously with the two 20 front tabs (80 a, 80 b) respectively, and in that the slot (62) of the cam (6) is replaced by two diametrically opposite slots (62 a, 62 b) suitable for the simultaneous embedding of the two tabs

  rear (81 a, 81 b) respectively.

  7 Lock according to any one of claims 3 to 6, 25 characterized in that the rear part of the rotor (1) is a part

  cylindrical (3) attached (screw 30 and holes 12) on the rear face of the rotor (1), pressed against the rear face of the stator (2), overhung by the tooth (25) or the teeth (25 a; 25 b) , and provided with a diametrical groove (31-32) suitable for sliding the finger (8, 80-81) or the fingers (Sa, 30 80 a-80 b; 8 b, 80 b-81 b).

  8 Lock according to any one of claims 3 to 7,

  characterized in that the cylindrical cam (6) is rotatably mounted in the bore (41) of the ring (4) containing the stator (2), between the rear face of said rear part (3) of the rotor (2) and the front face of the palastre (50) of the lock pierced with a hole (51) for free rotation

of the lug (60) with the cam (6).

  9 Lock according to any one of claims 3 to 7,

  characterized in that the cylindrical cam (6 ') is housed in a blind bore (92) of a hollow cylindrical drum (9) fixed on the rear of the ring (4'), between the bottom of the bore ( 92) of the drum 5 (9) and the rear face of the ring (4 '), the lug (60') of the cam (6 ')

  passing through a circular lumen (91) in the bottom of the drum (9).

  Lock according to any one of claims 1 to 9,

  characterized in that the front faces (Fig 2) of the rotor (1) and the stator (2) are coplanar and in front of the front face of the ring 10 (4).

  11 Lock according to any one of claims 1 to 9,

  characterized in that the front faces (Fig 11) of the rotor (2 ') and of the ring (4') are coplanar and in front of the front face of the stator (2 ').