GB2303874A

GB2303874A - Automatic deadlocking mechanism in latch bolt lock

Info

Publication number: GB2303874A
Application number: GB9615582A
Authority: GB
Inventors: Luis Valdajos Gallego
Original assignee: Talleres de Escoriaza SA
Current assignee: Talleres de Escoriaza SA
Priority date: 1995-07-31
Filing date: 1996-07-24
Publication date: 1997-03-05
Anticipated expiration: 2016-07-24
Also published as: FR2737526B1; DE19630972A1; IT1284701B1; GB9615582D0; ES2137792B1; FR2737526A1; ES2137792A1; ITTO960646A1; GB2303874B

Description

1 DOOR LOCK SPHERE OF INVENTION 2303874 The lock to which the present

invention relates is among those of which the only locking element is a latch of the sliding type. To cause the latch to open it will in general C be provided with: an eccentric operable by a key applied to an internal cylinder or, without distinction, to an external cylinder, which will not in all cases be present. Thus an internal rotor operable by an actuating means such as a handle or knob or else by acting on a push bar of the t pe usually installed inside escape or emergency doors. It Z> y also has an external cam operable by an actuating means such as a handle or knob. Locks of this type are frequently installed in fire-proof and similar doors.

PRIOR ART

These known locks, provided solely with a catch, have the problem that they can be easily opened by inserting sorne lamellar element such as a conventional credit card between the frame and the door, as they are sufficiently rigid to cause the withdrawal of the said latch when they are inserted edgewise into the gap between the door and its frame. This presents a serious problem in as much as wherever one of these locks is installed there is an operable door giving access to the building or premises, resulting in the paradoxical situation that a door designed for the safety of persons in cases of emergency is found to be positioned at a weak point in the internal security system of the building or premises concerned.

EXPLANATION OF INVENTION AND ITS ADVANTAGES According to the invention there is provided a lock, comprising: a first sliding-type latch, or first latch, having a corresponding receiving device in the door frame and C) movable between positions which are extended and retracted, respectively, in relation to the front of the lock; a rotary cam, operable in both senses by means of a key applied to an internal locking cylinder, provided in all cases, and in any external c linder 0 y provided; a rocker bar provided with a first and a second edge and vertically movable 2 between a respective lower position or position of rest and upper or lock- operating positions; an internal rotor rotatable by an internal actuator or push bar, the internal rotor having a first fin which is movable by the urging force of a first spring into a position of rest or a retracted position in respect of its rotation; an external rotor rotatable by an external actuator and provided with a second and a third fin, which are urged by the first spring into respective positions of rest or retracted positions in respect of its said rotation, the second fin matching the said first fin of the internal rotor; a first lever turning on a first shaft between a rotated and non-rotated position which movement is assisted and impeded respectively by a second spring and correspond to the said extended and retracted positions of tile first latch, the first lever being provided with a first arm, overhang (18), projection (19) and first protuberance (20), the said first arm (17) being the driving and transmitting means for the movement of the first latch C C between its extended and retracted positions; a rotatable restrictor which turns on a second rotating shaft between respective blocking and unblocking positions enabling or blocking the rotation of the first lever towards its said rotated position, the said rotatable restrictor having a foot, a first face and a second face, a first and a second appendage, 0 and a third spring which urges the restrictor on to its blocking position; and a second sliding type latch or second latch having no receiving device in the door frame, the 1= C second latch having a rod and being movable between extended and retracted positions C respectively in relation to the front of the lock, the said extended positions being facilitated by a fourth spring (31).

The operation of this lock will be clearly explained hereinafter by the aid of the attached drawings. In essence it is based on the following principles:

C (a) when the door is in the closed position in the frame the second latch is caused to occupy its retracted position, as it has no actual receiving device in the franie, so that the rotatable restrictor occupies a blocking position which prevents the opening rotation of the first lever when the latter is C5 driven via its first arni, exerting on the first latch a direct pressure such as C> would be produced by the aforementioned credit card or other means; 3 (b) in this closed door position it is still possible to open the lock from the inside of the door by means of the internal cam or rotor, since these are actuated by a sequence of operations in which in the first stage the restrictor is released so that in the second stage the first lever is caused to rotate and, by means of its first arm, retracts the first latch; (c) in the closed door position described in sub-par. (a) a sequence of operations such as described in (b) is likewise possible, effected from outside the door by means of the external rotor or cam, if an external cylinder for a key is provided.

According to a further characteristic of the invention, the said rocker bar may be mounted on a carriage capable of occupying respective retracted and advanced positions and provided with respective front and rear edges, the retracted position being that in which the rocker bar is operative in respect of the cam, third fin of the external rotor, overhang of the first lever and second appendage of the rotatable restrictor; the second advanced position being moved out of the zone swept by the cam and third fin; the front edge preventing a rotation of the cam in the direction opposite to the opening action, the C carriage occupying its retracted position; and the rear edge preventing a rotation of the cam in the same direction and prior to the rotation for the opening action, the said C carriage occupying the said advanced position.

c C> This makes It possible to nullify the operation described in the foregoing sub-par. (c), so that, when the building or premises are closed, the rotation of the external rotor takes place in vacuum, and only if an external cylinder is provided for a key will it be possible to open it by means of the eccentric, which a first turn of the key, causes the rocker bar to return to the position in which the function described in (c) is restored and that described in (a) can likewise be effected. Needless to say, it is also possible to effect the opening operation frorn the interior: by rneans of the key (as frorn the exterior) and by ineans of the internal rotor, which acts directly and not via the rocker bar, so that the position occupied by this latter is immaterial.

4 The invention may provide that the opening operation can be transmitted to other secondary locking points, for which purpose a continuation movement is provided, which is actuated by a third rotatable lever driven by a second protuberance belonging to a second lever rotating on a third shaft between non-rotated and rotated positions which are respectively urged or blocked by a seventh springs and which correspond to the aforementioned extended and retracted positions of the first latch, the said second lever having a second arm which is the driving and transmission means for the movement between the positions of this first latch.

DRAWINGS AND REFERENCES The invention will now be described in greater detail, by way of example, with reference to the drawings in which:

Fig. 1 illustrates a lock according to the invention as it would appear if its front and sides were transparent, in a position of rest, the door being outside the frame; Fig.2 is similar to Fig. 1 but shows the position of rest occupied when the door is already closed in its frame and the second latch occupies its retracted position; Fig. 3 is similar to Fig. 2 but shows the f irst stage of the opening operation effected by the cam when the rotary restrictor has assumed its non-blocking position; Fig.4 is similar to Fia.3 but shows the second stage of the opening operation effected by the carn when the first latch has already been retracted; a 1 0 0 Fig.5 shows the first opening stage illustrated in Fig.3 but in this case effected by means of the internal rotor; a FiC.6 is similar to Fig.5 but shows the second stage of the opening operation C effected by means of the internal rotor; and Fig...7 is similar to Fig.2 but shows the advanced position of the rocker bar; C1 The numbered iterns contained in these diagrams are as follows:

First latch Front of lock 3: Cam 4: Internal cylinder - and external cylinder, if any Rocker bar First edge Second edge Internal rotor First fin First spring Extemal rotor Second fin Third fin First lever First shaft Second spring First arm Overhang Projection 21:

First protuberance Rotary restrictor 22: Second shaft 23: Foot 24: First face 25:

26:

27:

28:

29:

30:

31:

32:

33:

34.

35:

36:

Second face First appendage Second appendage Third spring Second latch Rod Fourth spring Carriage Front edge Rear edge C Blocking piece c Fifth spring 0 6 37: 38: 39: 40: 41: 42: 43: 44: 45: 46: 47:

Sixth spring Third face Protuberance Static pivot Continuation movement Second lever Second protuberance Third shaft Second arin Seventh spring Third lever EXPLANATION OF A PREFERRED VERSION The figure of the drawings illustrate a preferred embodiment of the proposed new t> lock, which, as shown by Fig. 1 and the remaining diagrams, comprises:

a first sliding latch or first latch 1, having a corresponding receiving device 0 in the door frame and movable between respective extended and retracted positions defined in relation to the front 2 of the lock; a rotary cam 3 operable in both senses by means of a key applied in an internal lock cylinder 4, which is always present, and in any external cylinder 4 which may be provided; a rocker bar 5 having a first edge 6 and a second edge 7 and vertically movable between a lower position, or position of rest, and an upper position, in which opening of the door can be effected; an internal rotor 8 rotatable by ineans of an internal actuating device or push bar, the internal rotor 8 having a first fin 9 moved by the force of a first spring 10 into a position of rest or retracted position in respect of its C rotation; an external rotor 11 rotatable by rneans of an external actuator and provided with a second fin 12 and a third fin 13, which are moved by the 7 first spring 10 into a position of rest or a position retracted in respect of its rotation, the second fin 12 matching the first fin 9 of the internal rotor 8; a first lever 14 which turns on a first shaft 15 between non-rotated and rotated positions respectively, urged or impeded by a second spring 16 and corresponding to the extended and retracted positions of the first latch 1 which first lever 14 is provided with a first arm 17, over hangs 18, a projection 19 and a first protuberance 20, the said first arm 17 being the driving and transmitting rneans for the movement between the extended and retracted positions of the first latch 1; a rotatable restrictor 21 which turns on a second rotating shaft 22 between C respective blocking and non-blocking positions of the rotation of the said first lever 14 towards its rotated position, the rotatable restrictor having a foot 23, a first face 24 and a second face 25, a first appendage 26 and a second appendage 27, and a third spring 28 which urges the operation of the blocking movement; and a second sliding type latch or second latch 29 having no receiving device 0 in the frame of the door, the said second latch 29 having a rod 30 and being movable between respective extended or retracted positions in C> relation to the front of the lock, the extended position being urged by a fourth spring.

When the door is outside the door frarne and no action is exerted on the cam 3 or on the internal rotor 8 and the external rotor 11, this locking mechanism is in a position of rest, as shown in Fig. 1, wherein:

the first latch 1 occupies its extended position; tile cam 3 occupies the lowest position reached in the course of its rotation; the internal rotor 8 and external rotor 11 occupy their positions of rest determined by the action of the first spring 10 on the respective first fin 9 and second fin 12; 8 the rocker bar 5 occupies its lower position and the first edge 6 and second edge 7 of the rocker bar 5 continue to block respective ascending rotary movement of the said 3 and third fin 13 of the external rotor 11; the first lever 14 occupies a non-rotated position in which its overhang 18 and projection 19 block the respective linear and rotary ascending movements of the said second edge 7 of the rocker bar 5 and first fin 9 of the internal rotor 8; the said second latch 29 occupies its extended positions; and the rotatable restrictor 21 occupies a non-blocking position, in which the foot 23 is resting against the said rod 30 of the second latch 29, its first face 24 is deflected frorn the rotary movement of the first protuberance 20 of the first lever 14, and its first appendage 26 and second appendage 27 block the ascending movement of the second edge of the rocker bar 5 and first fin 9 of the internal rotor 8, both blockings taking place at respective points substantially coinciding with those of the overhang 18 and projection 0 19 of the first lever 14.

When the door is closed and occupies its locked position in the frame, the locking mechanism assumes (as shown in Fig.2) a secure locking position in which the first latch 1 can no longer be drawn back by direct action exerted on it from the outside: in this secure position:

the first latch 1 occupies its extended position, accommodated in the receiving ineans provided for it in the door frame; r-> the second latch 29, having no actual receiving means of its own, assumes 0 a retracted position in which the rod 30 no longer provides a support for the said foot 23 of the rotary restrictor 21; the rotary restrictor 2 1, on being deprived of its support on the said rod 30, rotates to a blocking position in which the said first face 24 assumes a position in which it prevents the commencement of the rotary movement of the said first projection 20 of the first lever 14, while at the same time 9 the first appendage 26 and second appendage 27 of the rotary restrictor 21 blocks, as stated, the said second edge (7) of the rocker bar and first fin 9 of the internal rotor, at points which precede the blocking of the said overhang (18) and projection 19 of the first lever 14; and the rocker bar 5 and the cam 3, internal rotor 8, external rotor 11 and first lever 14 remain in their position of rest. Consequently, in this position the lock cannot be opened by the aforementioned operation of inserting a credit card in the gap between the door and the frame, by which operation the known locks, lacking a safety device, can be opened without difficulty.

C> The opening operation of the. locking mechanism is explained hereinafter, according to whether it is actuated by illeans of an internal actuator, such as a handle or knob or a push bar, an external actuator (handle or knob) or a key applied to an internal cylinder 4 or also, if such is provided, to an external cylinder 4.

If, by means of the internal actuator or push bar the internal rotor 8 is caused to rotate, a sequential opening operation is effected, in which, firstly, the first fin 9 of the internal rotor 8 drives the first appendage 26 until the rotary restrictor 21 assumes its non-blocking position, after which, without leaving the first appendage 26, it likewise drives the projection 19, causing the said first lever 14 to assume its rotated position, causing the retraction of the first latch 1 and, with the said first protuberance 20 of the first lever 14, exerting a thrust on the second face 25 of the rotary restrictor 21. The 0 positions reached by the first and second operations in this sequential process are shown in Figs.5 and 6.

Continuing with the interior of the lock, if an opening turn is effected, by means of a key applied to tile said internal cylinder 4 this results in an ascending rotation of the cam 3, which, via the first edge 6, causes the rocker bar 5 to ascend to its upper position, according to a sequence of opening operations in which, firstly, the said second edge (7) C 0 t> drives the said second appendage (27) until the said rotary restrictor (21) reaches its said t non-blocking position, after which, without leaving the said second appendage 27, it likewise drives the overhang 18 until the first lever 14 assumes its rotated position, causing the retraction of the first latch (1). The positions reached by the first and second operations in this sequential process are shown in Figs.3 and 4.

Passing to the exterior of the lock, if the cam 3 is rotated by means of a key applied in an external cylinder 4, if any, the operation is exactly the same as when carried out with the internal cylinder 4.

If the external rotor is caused to rotate by means of an external actuator (handle or knob), the third fin 13 of the external rotor 11 will drive the second edge 7 of the rocker bar 5 until the rocker bar 5 reaches its tipper position, by means of a sequence of opening operations identical to that produced by actuating the cam 3. The only difference is that the ascent of the rocker bar 5 is effected by the action exerted by the third fin 13 on the second edge 7 instead of being effected by action of the cam 3 on the first edge 6. It has therefore not been considered necessary to include in the drawings two further figures showing the final stages of the first and second operations in the 0 C sequential opening process.

A further important characteristic of the invention is that intended to prevent the possibility of opening the door by actuating the external rotor 11, ensuring that the rocker C bar 5 is moved to a position in which its second edge 7 cannot be engaged by the rotation of the third fin 13, while the opening can still be effected by the rotation of the internal rotor 8 (no part being played by the rocker bar 5), just as by means of the cam 3, which is the part intended to effect both the forward and the return movement of the rocker bar 5. For this purpose, the rocker bar 5 is mounted on a carriage 32 which is capable of assuming a retracted or an advanced position and which is provided with a 0 respective front edge 33 and rear edge 34, the retracted position being that in which the C> rocker bar 5 is operative in respect of the cam 3, third fin 13 of the external rotor 11, overhang 18 of the first lever 14 and second appendage 27 of the rotary restrictor 21; the said second advanced position being i- noved out of the zone swept by the cam 3 and third fin 13; the said front edge 33 blocking a rotation of the carn 3 in the direction opposite 0 0 to the opening direction; and the rear edge 34 blocking a rotation of the cam 3 in the same direction and before the opening rotation, the carriage 32 occupying the advanced 11 position. The advanced position of the balance bar 5 is that shown in Fig. 7.

As a ineans of interlocking the two spaced positions of the rocker bar 5 a blocking C piece 35 is provided which is linked to the carriage 32, making it possible to effect autonomous vertical movement between a lower position of rest and blocking, which is urged by a fifth spring 36 and a sixth spring 37, and an upper unblocking position which, C both in the retracted and in the advanced position of the said carriage 32, is effected by the drive exerted by the cam 3 on a third face 38 of the blocking piece 35, this third face 38, according to the direction of rotation of the cam 3, is interposed in respect of the corresponding face of the front edge 33 and rear edge 34 of the carriage 32, the blocking piece 35 having a protuberance 39 which protuberance 39 in the direction of movement of the said carriage 32, engages just behind or just in front of a static pivot 40, according to whether the carriage 32 occupies its retracted position or its advanced position, the said protuberance 39 bridging the gap of the static pivot 40 when the blocking piece 35 C 0 occupies its upper position.

As a means of controlling other closure points on the frame which are distant from the main mechanism of the lock, the invention provides for a continuation movement 41 actuated by a third rotary lever 47 driven by a second protuberance 43 belonging to a second lever 42 turning on a third shaft 44 between a non-rotated and a rotated position which are respectively urged or blocked by a seventh spring 46 and which correspond to the extended and retracted positions of the first latch 1, the second lever 42 having a second arm 45 forming the driving means and transmitting the movement between the positions of this first latch 1.

Modifications of fornis, material and lay out can be provided within the scope of the appended claims.

12

Claims

1. A lock, comprising:

C a first sliding-type latch, or first latch, having a corresponding receiving device in the door frame and movable between positions which are extended and retracted, respectively, in relation to the front of the lock; a rotary carn, operable in both senses by means of a key applied to an internal locking cylinder, provided in all cases, and in any external cylinder provided; a rocker bar provided with a first and a second edge and vertically movable between a respective lower position or position of rest and upper or lockoperating positions; an internal rotor rotatable by an internal actuator or push bar, the internal rotor having a first fin which is movable by the urging force of a first spring C & into a position of rest or a retracted position in respect of its rotation; an external rotor rotatable by an external actuator and provided with a second and a third fin, which are urged by the first spring into respective positions of rest or retracted positions in respect of its said rotation, the second fin matching the said first fin of the internal rotor; a first lever turnina on a first shaft between a rotated and non-rotated position which movement is assisted and impeded respectively by a second spring and correspond to the said extended and retracted positions of the first latch, the first lever being provided with a first arm, overhang (18), projection (19) and first protuberance (20), the said first arin (17) being the driving and transmitting means for the movement of the first latch between its extended and retracted positions; a rotatable restrictor which turns on a second rotatincy shaft between t> respective blocking and unblocking positions enabling or blocking the rotation of the first lever towards its said rotated position, the said rotatable restrictor having a foot, a first face and a second face, a first and C a second appendage, and a third spring which urges the restrictor on to its t> C> 13 blocking position; and a second sliding type latch or second latch having no receiving device in the door frame, the second latch having a rod and being movable between extended and retracted positions respectively in relation to the front of the lock, the said extended positions being facilitated by a fourth spring (31).

2. A lock, as claimed in claim 1, characterised by the fact that when out of the door frarne and if no action is exerted on the said actuator, internal push bar, external actuator and cam, the lock occupies a position of rest in which:

the said first latch is in its extended position; the cam is in the lower position of its rotation; the internal and external rotors occupy their positions of rest determined by the action of the first spring on the said respective first and second fins; the rock-er bar occupies its lower position and the said first and second edge of the rocker bar block the respective ascending rotations of the cam and third fin of the external rotor; the first lever occupies a non-rotated position in which its overhang and projection (19) block the respective ascending, linear and rotary courses of the said second edge of the rocker bar and the first fin of the internal rotor; the said second latch occupies its extended position; and the said rotary restrictor occupies a non-blocking position in which the foot bears oil tile said strap of the second latch, its said first face is moved out at the rotary path of the said first protuberance of the first lever and its said first and second appendages block the ascending movement of the said second edge of the rocker bar and the first fin of the internal rotor, both blocking actions at the respective points mainly coinciding with those of the overhang and projection of the first lever.

r>

3. A lock, in accordance with clairn 2, characterized by the fact that when the lock is closed in the corresponding door frame a locking position is produced with anti- 14 retraction safety for the first latch if it is subjected to any external direct action, in as much as:

the first latch occupies its extended position, lodged in the receiving device of the door frame; the said second latch, having no receiving device of its own assumes a retracted position in which the strap no longer supports the said foot of the rotary restrictor; the rotary restrictor, on losing its support on the said strap, rotates to a blocking position in which the said second face blocks with the commencement of the rotary movement of the said first protuberance of tile first lever; at the sarne time, the first and second appendages of the rotary restrictor are in blocking relation to the said second edge of the rocker bar and first fin of the internal rotor at points preceding the blocking positions with the said overhangs and projection of the first lever; and the said rocker bar and the cam, internal rotor, external rotor and first lever remain in their positions of rest.

4. A lock, in accordance with claim 3, characterised by the fact that in the said safe locking position, if by rneans of the said internal actuator or push rod, the internal rotor is rotated, this results in a sequential opening process in which, firstly, the first fin of the C internal rotor drives the said first appendage until the rotary restrictor assuiries its said non-blocking position, and secondly, without departing frorn the said first appendage, likewise drives the overhang, causing the first lever to assurne its rotated position, 0 c resulting in the retraction of the first latch, and, with the first protuberance of the first lever, exerting a thrust on the said second face of the rotary restrictor.

5. A lock in accordance with the claims 3 or 4, characterized by tile fact that in the safe locking position, if, by means of a key applied in the internal cylinder or any external cylinder an opening rotation is performed, an ascending rotation is performed by the 0 C carn, which, via the said first edge, causes the said rocker bar to ascend to its said upper position, in accordance with an opening sequence in which, firstly, the second edge drives C the second appendag C e until the rotary restrictor reaches its non-blocking position, while secondly, without departing from the said second appendage, it likewise drives the C overhang until the first lever assurnes its rotated position, causing the retraction of the first latch (1).

6. A lock, according to claims 3, 4 or 5, characterized by the fact that, in the safe locking position, if, by means of the external actuator, the external rotor is rotated, the third fin of this external rotor drives the second edge of the rocker bar until this rocker t> bar reaches its upper position, by executing a sequence of opening movements identical to that caused by actuating the carn, in accordance with the claim 5.

7. A lock, in accordance with any preceding clairn, characterized by the fact that a continuation movement system is provided, which is driven by a second protuberance (which may coincide with the protuberance, shaft when the change is effected manually), belonging to a second lever which rotates on a third shaft between non-rotated and rotated positions respectively urged and impeded by a seventh spring, which correspond to the extended and retracted positions of the first latch, the second lever having a second arm forming the driving and transmitting means for the displacement between the C) positions of the first latch.

8. A lock in accordance with any preceding claim, characterized by the fact that the rocker bar is mounted on a carriage capable of assuming respective retracted or 0 advanced positions and provided with respective front and rear edges; the retracted position being that in which the rocker bar is operative in respect of the carn, third fin of the external rotor, overhang of the first lever and second appendage of the rotary 0 C restrictor; the said second advanced position being removed from within the zone swept M= by the carn and third fin; the front edge blocking a rotation of the carn in the direction cl opposite to the opening direction, the carriage occupying its retracted position; and the C rear edge blocking a rotation of the said cam (3) in the same direction and before the opening rotation, the said carriage being in the advanced position.

C C 16

9. A lock in accordance with the claim 8, characterized by the existence of a blocking piece linked to the said carriage, with the possibility of effecting an autonomous vertical movement between a lower rest and blocking position, urged by fifth and sixth springs, and an upper unblocking position which, both in the retracted and in the advanced position of the carriage, is produced by the force exerted by the cam on a third face of C the blocking piece, which third face according to the direction or rotation of the said cam, is interposed in respect of the corresponding edge of the said front and rear edges of the C> carriage, the blocking piece occupying its lower position, which blocking piece is provided c C Z5 with a protuberance, which protuberance, in the direction of movement of said carriage, is applied just behind or just in front of a static pivot, according to whether the carriage occupies its retracted or advanced position, the protuberance bridging the gap of the said static pivot when the said blocking piece occupies its said upper position.

10. A lock substantially as described herein with reference to the drawings.