ES2300075T3 - EMPOTRATED LOCK. - Google Patents

Abstract

A mortise lock has a rotating lock nut linked to a drive. Both the nut linkage, and the associated top and bottom pushrod release levers, operate as swivel levers. The initial zero point is commensurate with the lock nut neutral point so that the pressure elements are presented at the back end of the mandrel.

Description

Recessed lock.

The present invention relates to a lock recessed according to the preamble of the main claim.

A similar recessed lock is known, for EP 0 584 549 B1.

In case of escape doors, it exists with often the need to make such doors as doors of two sheets, so that in case of danger, by opening the swing blade and stationary blade, you can create a large opening to provide as many people as possible, the possibility of being able to quickly leave the danger zone.

Although in the escape doors, so regular only one escape direction is established, these doors are used, however, also in the opposite direction.

In this sense it is advantageous to condition the Exhaust doors with large area glazing, so that people coming in direction can be recognized in time contrary.

But the glass doors with great surface are normally built as the so-called doors of tubular frame, and have a relatively narrow profile of the tubular frame, in which finally they still have to stay recessed locks.

In addition, the corresponding locks recessed for the swing blade, are increasingly provided with a latch output of at least 20 mm stroke of the latch.

In the operation of an escape door, at actuate the recessed lock on the stationary leaf, next to the input movement of the upper and lower bars of approach, obviously you have to be assured that the Slip and latch of the swing blade lock, they also move back safely, using the trigger mechanism provided in each, in the swing leaf lock, when are provided with great output.

The built-in lock known by the document EP 0 584 549 B1 quoted at the beginning, undoubtedly complies with this function.

However, it has been shown that it cannot ensure the introduction of rotation pairs sufficiently large in the trigger mechanism responsible for the latch, in special, in case of incorrect service or treatment of the recessed lock.

Such an incorrect treatment may be triggered, for example, by making the escape door two leaves open violently without a sufficiently wide recoil of the slip and latch, so that movements are generated forced between latch and latch of the latch, which double the latch.

Another treatment error may cause also malfunctions, for example, by overlapping the lock in mounted state. It is the mission of the invention to perfect the known recessed lock, so as to avoid the inconveniences mentioned above.

This mission is solved by the invention with the characteristic notes of the main claim.

The advantage of the invention is that by means of the lock nut, pairs of very large rotation to the latch trigger mechanisms and of the slip. This is achieved by making the mechanisms triggers coupled rigidly in rotation with the movement of turn of the lock nut, can act in the direction towards the latch that enters the latch of the latch, and towards the slip that is introduced in the lock of the slip.

The combination of the production of large pairs of rotation, together with a rigid coupling in rotation of the corresponding trigger mechanisms, as well as the respective coupling elements for the upper bar e lower approach, is oriented to optimal use of the space of the very narrow lock box, so that, especially for the arrangement of the thrust pieces that are provided, when the lock nut is in position neutral, in the area of the measurement of the rear bolt, are possible not only large lever arms between the nut of the lock and the thrust pieces but also large angles of rotation of the swivel lever involved.

The invention is therefore based on the fundamental idea of, using the doorknob, to be able to introduce the greatest pairs of possible rotation in the nut of the lock, while at the same time should be optimally used the mounting space that there is available in the lock box, to create a Vandal resistant lock.

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This is done in part by making the pieces thrust acting on the triggers, in the neutral position of the nut of the lock, rest in the area of the measure of the rear bolt while using the corresponding kinematic couplings of these thrust pieces are available also in the nut of the lock, with large lever arms to produce large turning torques and therefore also large forces, on the trigger mechanisms.

On the other hand, the space of mounting that is available, for mounting and mobility of interior pieces.

The principle of the invention thus rests also in the consideration of performing the elements of coupling for upper and lower bar drive of approach, and of the two triggers, like levers swivels, whose axis of rotation is supported on the box of the lock, and whose initial positions corresponding to the neutral position of the lock nut, be chosen so that each of the respective thrust pieces, rest in the measurement area of the rear bolt.

This way you can get the levers upper and lower swivels applied by the pieces of push, have a very large turning angle for the actuation of the trigger mechanisms and the elements of coupling

On the other hand, the invention also takes consideration of the fact that despite the twist of the nut of the latch in only one direction, with respect to entry movements of the upper and lower bar of zooming in, two opposite movements have to occur.

This is achieved by making the movement of turn of the latch nut, is transmitted by a lever intermediate to the coupling element for the upper bar of approach, the axes of rotation of the two being arranged rotating levers on which the elements of coupling, above or below each of the pieces active thrust.

The simple constructive principle of invention, allows the manufacture of series of recessed locks  of different bolt sizes, without abandoning the basic idea of invention. This advantage is achieved by making it in the same structure is conducted a "growing measure of bolts" to wider lock boxes and, therefore, "only" have that "grow together" the trigger mechanisms for the Slip or latch. A series of such locks recessed can comprise, for example, bolt measurements, between 30 and 65 mm or more. Each series has a minimum bolt size and a maximum bolt size.

If the trigger mechanism for the slip is integral part of the upper swivel lever, this offers the advantage that lever multiplications are variable in wide ranges and yet the slip trigger can also travel large paths for slips widely outgoing

For this purpose it is proposed that the mechanism trigger for the slip, in the case of slip completely left, in the neutral position of the lock nut, rest practically just two to three millimeters in front of the coordinated surface of slip application, so that already with little turning movement of the lock nut, the slip go back through the trigger mechanism, to the lock of the swing blade

The invention also allows very long distances. large between trigger mechanisms, that is, between those surfaces of the trigger mechanisms, which actually affect the slip or latch, and the centers of rotation of the respective rotating levers.

If these distances are at least as large as the minimum bolt size in a series of locks embedded, very large loading arms are produced which, in special, in combination with the large power arms that produce for the thrust pieces, lead to a lock recessed smooth operation and yet very resistant.

If also, with the lock nut located in the neutral position, it is planned to place the latch arm that extends down there in the nut of the lock in where the bolt measurement side sits, you can also make large angles of rotation that as a result of the kinematic chain between the nut of the lock and the lever bottom swivel, push back with full efficiency too Very projecting latches to the swing leaf lock.

For convenience, the rotary drive between the nut of the lock and the intermediate lever, is performed through a pair of toothed segments that correspond mutually, in the nut of the lock or in the intermediate lever, so that for all the turn positions of the nut of the lock, are also correspondingly multiple gears gear zones in the co-ordinated serrated segments of the nut of the lock and the intermediate lever. This measure increases the resistance of the recessed lock, especially Against vandalism

In addition, it may be planned to provide for lower swivel lever that forms the coupling element for the lower zoom bar, a so-called window free operation.

The free-running window serves the objective of not transmitting manipulations in the lower bar of approach by illicit lifting, to the kinematic union between the nut of the lock and the lower rotating lever. Possible manipulation attempts do not trigger the chain kinematics between the lower rotary lever and the nut of the lock and, consequently, neither the kinematic chain between the Lock nut, intermediate lever and swivel lever higher.

To obtain a great resistance, in addition it proposes to make the nut of the lock, reaching the head side to near the surface inside of the head plate. This zone is then connected the latch arm, preferably, in one piece. This improvement of the invention takes advantage of the knowledge of that there is space between the nut of the latch and the latch in the lock case housing, which in a lock case with the minimum possible bolt size, it still provides large turning torques for rotating lever operation lower.

Thus, the invention is especially suitable for recessed door locks with tubular frame of different bolt sizes, that is, for series of built-in locks of this type.

Also, in the nut of the lock, between the square opening and the inner wall of the head, can be provided a circular ring segment opening that aligns with the corresponding through holes in the lock case and on the lock cover, so that now they can also put round lock shields or similar, without reducing the resistance.

To this end the opening angle of the circular ring segment opening, is at least as large as the maximum necessary angle of rotation of the nut of the lock, plus the need for space for the through hole. By required maximum angle of rotation of the lock nut, understand that angle that has to turn the nut of the lock for the complete withdrawal of the approach bars and for the full recoil of the slip and latch.

Here the through holes must be arranged in the nut of the lock and in the cover of the lock according to place, distance from square opening and own diameter, either in accordance with the standard, or compliance with the hardware program by the maker.

You have to pay special attention to a improvement of the invention.

The lock nut can be composed of two sheet metal parts placed one above the other, each of which it is provided with a square opening for the square stem of the latch.

In this way you can assign the different functions to be performed by the nut of the lock, in each case, to one of the two pieces of sheet metal.

However, the two pieces of sheet metal are coupled with each other, at least by means of the square stem of the latch.

If it is intended as a rigid torque connection between the two pieces of sheet metal, an elastic pin that crosses the two pieces of sheet through holes aligned with each other, the drills can move very little with respect to each other, from such that the square openings turn very little a with respect to another, in the sense of an accommodation without game of square stem

In this way it is generated, starting from each of sheet metal parts, an insignificant torsion of the stem square that is thus held without play in the lock of locking latch.

In this sense the elastic pin serves to a flexible mutual elastic joint that acts insignificantly in the tangential direction of the two pieces of sheet metal, and that It keeps without wear for many years.

Additionally, the rigid union of torque between the two pieces of sheet metal by a drag arm that sits on one of the two pieces of sheet, and leans on the other piece of sheet in the direction of rotation of the door opening.

For convenience, the drag arm is supported from the back on the latch arm.

The realization of the two pieces of sheet metal in flat shape, for example, as simple stamped pieces, allows A cheap manufacturing.

Therefore, support should be taken to out using a coupling pin that is incorporated into the drag arm of the corresponding sheet metal part.

The functional separation of the two pieces of sheet, also allows the provision of stop surfaces for the rotary movements of the lock nut, where there is still room in the lock case for corresponding stop bolts.

To this end it is proposed that one of the two sheet metal parts are provided with both the rotary drive, as also with the doorknob arm, while the other of the sheet metal parts are provided at the corresponding points with butt surfaces for butt bolts that seat in the case of the lock.

For convenience, the stop bolts go through completely the lock case and are attached in their walls, so that violent torsion of the nut of the lock, for example, by vandalism.

The following explains in detail the invention by the hand of embodiments.

Shows:

Figure 1 Layout of the invention on the sheet stationary of an escape door, in action combined with the Swing leaf lock, closer state.

Figure 2 Representation according to figure 1 with latch pushed back and slip pushed back, Approach bars removed.

Figure 3 Representation corresponding to the Figure 1, although with latch with large exit from the latch.

Figure 4 Representation corresponding to the Figure 3, although the latch with locking of the latch that would be released by sliding the slip.

Figure 5 Representation of the invention in a locking bolt lock, in plan view with

Figure 6 Corresponding representation of the side elevation latch lock.

As long as nothing else is said then the The following description is always valid for all figures.

The figures show a recessed lock 1 according to this invention.

Such a recessed lock 1 is tucked into a corresponding recess of the stationary leaf 7 of a door two-leaf exhaust in constructive form with tubular frame,

The recessed lock 1 has a box 2 of the lock. The lock box 2 closes in the direction towards the leaf 8, by a sheet 3 of the head. In sheet 3 of the head are, a lock of the slip and a strike of the latch, for slip 9 and latch 10 of the lock the swinging leaf.

Between the cerradero del slips and the cerradero from the latch, sits a nut 4 of the lock, which can turn in box 2 of the lock. Lock nut 4 is it operates - it is well known in itself - through an opening 40 square, with a handle or similar.

The center of the 40 square opening serves as measuring point for determining bolt measurement 4a, which is measured in the direction towards the sheet 3 of the head, and of the measure 4b of the rear bolt that is determined in the direction contrary.

With sheet 7 stationary closed, a bar 5 top approach is deployed upwards, and a 6 lower zoom bar, it is down, and ensures sheet 7 stationary against illegal opening.

Such a recessed lock is therefore used for actuation of the top 5 approach bar and the 6 lower bar of approach, as well as for the drive of slip 9 and latch 10 coming from the corresponding recessed swing leaf lock, are inserted in the lock of the slip and in the latch of the latch of the sheet 3 of the head.

For this, the nut 4 of the lock, with the blade 7 stationary closed with bar 5, 6 upper and lower unfolded, as well as leaf 8 leaf closed at the same time, with Slip 9 deployed and latch 10 deployed, acts at through lever arms rigidly connected in rotation with it, by means of coupling elements located intermediate, on the 5, 6 bar of approaching the stationary leaf, located up and down, at least in the sense of each of the 11, 12 fold movements.

This means that the bars of approach can also have the so-called locks of connection that cause an automatic deployment of the bars Approach when stationary sheet 7 is closed.

In this regard refer to the current state of the technique.

On the other hand, elements of coupling with whose help, mechanisms 13, 14 triggers they serve to move the retracted slip back in the slip strike, and the latch retracted in the strike of the latch, leaf 8 swing.

Now the essential thing is that in each case from the point of view of a neutral position 15, as shown in the figure 1, and in each case starting from the nut 4 of the lock, it is provided an arm 50 of the latch that extends in the direction 16 down, which is rigidly coupled, preferably a single piece, to nut 4 of the lock, and acting in the area of the measurement 4b of the rear bolt with a first thrust piece 17 acting in the direction towards the sheet 3 of the head, on a rotating lever 18 that is resting on the lock case below the first thrust piece 17, so that as consequence of its turning movement starting from piece 17 of thrust, operated by a coupling element 19 that find in it, the lower 6 approach bar in the direction of its folding movement 12 and, on the other hand, the trigger mechanism 14 that pulls latch 10 back in its case completely out, to the swing leaf lock.

To this end, the lower rotating lever 18 it is supported by the lock box 2, with a pivot shaft arranged in the area of the 4th measurement of the bolt, and that here even it sits still below latch 10, and carries on its face rear the coupling element 19, which in the form of a hook it fits into an antagonist hook of the lower bar 6 of approach.

It is evident that with the rotation of the lever 18 rotating lower clockwise, the coupling element 19 will introduce the lower bar 6 of zoom in the recessed lock 1 while at the same time, the trigger mechanism 14 collides with a surface corresponding application from a position predetermined rotation, against a corresponding surface of the latch 10, and for a further turning movement, on the one hand raise the lower approach bar 6 further and, moreover, the latch 10 will be pushed further in the lock of the swing blade

In addition, in the nut 4 of the lock, in the direction 20 upwards a rotating drive 21 sits which is in gear with form drag, with an area 22 correspondingly configured actuator of a lever 23 intermediate resting on box 2 of the lock.

The rotary drives are configured here without reciprocal free operation, so that a bar 5 upper approach, for example, applied elastically, is able also to roll back nut 4 of the lock, to its neutral position 15.

The intermediate lever 23 has a second piece 24 thrust with which it acts on a rotating lever 25 upper which forms at least the coupling element 26 for the top 5 zoom bar.

In neutral position 15 of nut 4 of the lock, the second thrust piece 24 is also in the measurement area 4b of the rear bolt, to also allow here an angle as large as possible of the lever 23 intermediate, which is practically transmitted 1: 1 to lever 25 upper swivel.

The upper swivel lever is arranged by its part, above the second thrust piece and -here- even above the exit route required by the slip, of so that slips with great output can also be operated of the slip, by this recessed lock.

The trigger mechanism 13 for the slip, must be an integral part of the upper rotating lever 25, so that with the same constructive principle they are also possible Higher bolt sizes.

In the example shown of embodiment it serves to this a bolt or similar in the upper swivel lever, which is applied by the second thrust piece 24 of the intermediate lever, on one of its faces, while on the opposite side it hits Slip 9, and during the corresponding rotating movement, is able to push back that one, to the leaf 8 lock swinging

The figures also show that the distances 27, 29 between the mechanisms 13, 14 triggers, that is between those contact areas that are in contact in the path of rotation of the respective trigger mechanism with the slip or with the latch, and the centers 28, 30 of rotation of the respective lever swivel in which the mechanisms 13, 14 triggers settle, they are at least in the order of magnitude of the minimum measure 4a of the bolt.

But for convenience distances 27, 29 are always as large as the minimum 4a size of the series bolt of locks.

For the transmission of large pairs of rotation, the invention seeks an optimal use of the mounting space that is available.

The arm arrangement 50 of the latch that extends down, so that with the nut 4 of the lock in neutral position 15, it is applied to the side of the measure 4a of the mandrel in the nut 4 of the lock.

Thanks to this provision they are not only possible well large angles of rotation but also an embodiment heavy duty lock nut.

As shown in particular in Figure 1, here the nut 4 of the lock can arrive, in the realization of the 4a minimum bolt lock on the side of the head, up to near the inner surface of the head plate, and finish only with a distance of 1 to 3 mm in front of it. In a recessed lock with, for example, a maximum measurement 4a of the 30 mm bolt, this distance would accordingly be 31 mm at 33 mm

So that in this improvement you can fix, however, a hardware, for example, a round shield or similar in the lock case, it is proposed that nut 4 of the lock present on its side towards the head an opening 31 of circular annular segment shape whose opening angle 32 is at less as large as the maximum necessary angle 33 of rotation of the 4 nut of the lock, plus the need for space for through holes 34, the arrangement of opening 31 being chosen, so that in all the turning positions of the nut 4 of the lock, an aligned connection of the holes 34 is possible interns in the lock case and on the cover of the lock. The figures also show that the drive 21 swivel that extends in the direction 20 upwards when the nut 4 of the lock is in neutral position 15, it settles on nut 4 of the lock, essentially on the side of 4a bolt size.

Thanks to this provision, despite the measure of the rear bolt, only very small, which in practice amounts to at least 15 mm, allows the nut to rotate 4 of the lock, at the maximum turning angle 33 required.

The maximum necessary rotation angle 33 is that the nut 4 of the lock has to be turned from the position 15 neutral so that, on the one hand, the bar 5 is retracted so much upper approach, as well as the lower bar 6 of approach to free the stationary sheet 7 and, in addition, mechanisms 13, 14 triggers for the slip 9 and latch 10 in the direction towards sheet 8 swing, to allow an opening without the door tightness two leaf escape.

The figures also show that the rotary drive 21 is formed in the nut 4 of the lock, by a zone 35 of toothed segment comprising several teeth, and that the intermediate lever 23 has a segment zone 36 Toothed corresponding to that.

In this way it is achieved that despite the rotary movement of the lock nut 4, between the serrated segments there is always a multitude of drag zones in a way, coordinated with each other.

This offers the advantage of a resistance of many years and high stability against vandalism.

In addition, the figures show a window 37 of free operation found on the rotary lever lower, above the coupling element 19 for the bar 6 Lower approach.

At least ideally you can imagine that of this way the lower approach bar 6 can be raised, without that this movement be transmitted to the kinematic chain between the lower swivel lever, lock nut, lever intermediate and upper swivel lever.

Especially Figures 5 and 6 show a advantageous improvement.

It shows that the nut 4 of the lock is It consists of two pieces 38, 39 of sheet metal placed one on top of the other. The first piece 38 of sheet metal located above in figure 5, presents both the rotary drive 21 - here in the form of a toothed -, as well as the first thrust piece in the arm 50 of the latch.

Underneath, essentially congruent with her, she find the second piece 39 of sheet metal that is provided with corresponding stop surfaces 44, 45 acting in combination with stopper bolts 46, 47 fixed in box 2 of the lock, for each of the two directions of rotation.

Also congruent is incorporated in both sheet metal parts 38, 39, the annular segment shape opening 31 circular.

In addition, the two pieces 38, 39 of sheet metal are rigidly connected to each other in terms of rotation torque.

The union is carried out on the one hand by the opening 40 square common to the two pieces 38, 39 of sheet metal, and which is planned for the accommodation of a square stem known in itself.

In addition to this, the two pieces 38, 39 of sheet are joined together by a common elastic pin 41, to obtain a mutual fixation of the two pieces 38, 39 of sheet metal, One respect to the other.

This measure offers the complementary advantage of that the holes for the elastic pin can be arranged in the two pieces of sheet, so that in case of assembly well aligned of the elastic pin, the openings 40 square, each of them in one of the pieces 38, 39 of sheet metal, turn a little respect to the other, in the sense of an accommodation without game of corresponding square stem that must pass through the opening 40 square

This produces a recessed lock to act without game for many years.

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Additionally, the lower part 39 of sheet metal, bearing the surfaces 44, 45 butt, has an arm 42 of drag that rests on the arm 50 of the handle of the piece 38 upper plate, in the direction of rotation of the nut of the lock for opening the door.

It is a coupling pin 43 here which transmits the rotating movement of the second piece 39 of sheet -here- located below, in the plane of movement of the first piece 38 of sheet metal -here- located above.

The surfaces 44, 45 butt in the nut of the lock are contacted for convenience with bolts 46, 47 butt that completely pass through the lock box 2, and They are attached to its walls.

List of reference symbols

one

Recessed lock

2

Lock case

3

Head plate

4

Lock nut

4th

Minimum bolt size

4b

Rear Bolt Measurement

5

Top Approach Bar

6

Lower Approach Bar

7

Stationary sheet

8

Swing blade

9

Slip

10

Latch

eleven

5 fold movement

12

6 fold movement

13

9 trigger mechanism

14

10 trigger mechanism

fifteen

Neutral position

16

Direction down

17

First push piece

18

Lower swivel lever

19

Coupling element for 6

twenty

Direction up

twenty-one

Rotary drive

22

Drive zone

2. 3

Intermediate lever

24

Second thrust piece

25

Upper swivel lever

26

5 coupling element

27

Distance 13 - 28

28

25 turn center

29

Distance 14 - 30

30

18 turn center

31

Ring segment shape opening circular

32

Opening angle

33

Maximum angle of rotation required

3. 4

Through hole

35

Serrated segment zone of 38

36

Corresponding toothed segment area of the intermediate lever

37

Free operating window

38

First piece of sheet metal

39

Second piece of sheet

40

Square opening

41

Elastic pin

42

Drag arm

43

 Coupling pin

44

Stop surface of the first direction of turn

Four. Five

Stop surface of the second direction of turn

46

First stop bolt

47

Second stop bolt

fifty

Doorknob arm.

Claims (19)

1. Built-in lock (1) for the stationary leaf (7) of a two-leaf exhaust door, in a tubular frame construction, with a lock box (2), in which a slip lock provided in the sheet (3) of the head, and a latch of the latch, sits a nut (4) rotating the lock, which with the stationary leaf (7) closed with the top and bottom bar (5) deployed, as well as the leaf (8) closed at the same time, with the slip (9) deployed and with the latch (10) deployed, it acts on the one hand through a lever arm rigidly connected in rotation with it, and by means of elements of coupling located intermediate, on each of the bars (5, 6) of approaching the stationary leaf (7), arranged up and down, at least in the direction of each of the folding movements (11, 12) and , on the other hand, by kinematically connected coupling elements, additionally and on mechanisms (13, 14) triggers to reverse the slip (9) that is in the lock of the slip, or the latch (10) of the leaf (8) swinging that is in the strike of the latch, characterized in that in each case from the point of view of a nut (4) of the lock that is in the neutral (15) position, and in each case starting from the nut (4) of the lock, an arm (50) of the latch is provided which is extends in the direction (16) down, which acts in the area of the measurement (4b) of the rear bolt, with a first piece (17) of thrust acting in the direction towards the head plate (3), on a lower rotating lever (18) resting on the box (2) of the lock, below the first thrust piece (17), and that forms on the one hand the coupling element (19) for the bar (6) lower approach and, on the other hand, the mechanism (14) latch release (10), as well as a rotating drive (21) that extends in the upward direction (20) that fits with drag in the configured drive zone (22) correspondingly of an intermediate lever (23) resting on the lock box (2), which also acts in the area of the measurement (4b) of the rear bolt, with a second piece (24) of thrust acting in the direction towards the head plate (3), on a top rotating lever (25) supported rotating mobile in the box (2) of the lock, above the second piece (24) of thrust, and which forms at least the coupling element (26) for the upper approach bar (5). A recessed lock (1) according to claim 1, characterized in that it has a bolt measurement that is located between a minimum bolt measurement (4a), and a maximum bolt measurement, so that it is appropriate to be an integral part of a series of similar built-in built-in locks, with different bolt sizes. 3. Recessed lock (1) according to claim 2, characterized in that the distances (27, 29) between the trigger mechanisms (13, 14) and the turning centers (28, 30) of the respective rotating levers on which they sit the trigger mechanisms (13, 14) are at least as large as the minimum bolt size (4a). 4. Recessed lock (1) according to any one of claims 1 to 3, characterized in that the trigger mechanism (13) for the slip (9) is an integral part of the upper rotating lever (25). 5. Recessed lock (1) according to any one of claims 1 to 4, characterized in that the arm (50) of the latch extending downwards, with the nut (4) of the lock in the neutral position (15), extends from the measurement side (4a) of the mandrel, to the measurement side (4b) of the rear mandrel, and the coordinated thrust piece to the arm (50) of the latch, is located on the measurement side (4b) of the rear bolt 6. Recessed lock (1) according to claim 2 in conjunction with claim 5, characterized in that in the recessed lock with the minimum measurement (4a) of the bolt, the nut (4) of the lock arrives, from the head side, up to near the inner surface of the sheet (3) of the head. 7. Recessed lock (1) according to claim 6, characterized in that the lock box (2) has a through hole (34) in the lock box and in the area of the lock nut (4). the cover of the lock, and because the nut (4) of the lock has on its side of the head, an opening (31) in the form of a circular annular segment, whose opening angle (32) is at least greater than the angle ( 33) maximum required rotation of the nut (4) of the lock, in the angular area corresponding to the diameter of the through hole (34), and because the opening (31), in all positions of rotation of the nut (4) of the lock, it is aligned with the through holes (34) in the lock case and in the lock cover. 8. Recessed lock (1) according to claim 7, characterized in that the through holes (34) are provided for the accommodation of a hardware fixing screw, which passes through the lock box (2). 9. Recessed lock (1) according to any one of claims 1 to 8, characterized in that the rotary drive (21) extending in the upward direction (20), when the nut (4) of the lock is in the position (15) neutral, it essentially sits on that side of the nut (4) of the lock, in which the size of the nut bolt (4) of the lock is determined.

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10. Recessed lock (1) according to any one of claims 1 to 9, characterized in that the rotary drive (21) is formed by a toothed segment zone (35) in the nut (4) of the lock, and because the lever ( 23) intermediate presents a zone (36) of toothed segment corresponding to that. 11. Recessed lock (1) according to any one of claims 1 to 10, characterized in that the lower rotating lever (18) has a coupling element (19) for the recoil or lifting of the lower approach bar (6), and It is provided with a free-running window (37), to thwart a possibility of manipulation in which the lower approach bar (6) was raised from outside the recessed lock. 12. Recessed lock (1) according to any one of claims 1 to 11, characterized in that the nut (4) of the lock is composed of two pieces (38, 39) of sheet metal placed one above the other, each of which is provided with a square opening (40) for the square stem of the door handle. 13. Recessed lock (1) according to claim 12, characterized in that of the sheet pieces (38, 39), only one (38; 39) is provided, both with the first thrust piece (17) and also with the drive (21) rotating, while the other (39; 38) is rigidly joined in torque, with the first. 14. Recessed lock (1) according to claim 13, characterized in that the rigid joint in torque is carried out by means of an elastic pin (41) that crosses the two pieces (38, 39) of sheet metal. 15. Recessed lock (1) according to claim 14, characterized in that in the two pieces (38, 39) of sheet metal there are provided holes for the elastic pin, which in case of a well-aligned assembly of the elastic pin, rotate the openings (40 ) square, very little one with respect to the other, in the sense of a housing without game of the corresponding square stem. 16. Recessed lock (1) according to any one of claims 13 to 15, characterized in that for the rigid joint in torque, of the sheet metal parts (38, 39), the other sheet metal part (38, 39) has a drag arm (42) that rests on the arm (50) of the latch, in the direction of rotation of the nut (4) of the lock for opening the door. 17. Recessed lock (1) according to claim 16, characterized in that the support is carried out by means of a coupling pin (43). 18. Recessed lock (1) according to any one of claims 1 to 17, characterized in that the turning area of the nut (4) of the lock is limited for each of the two directions of rotation, by a surface (44, 45) butt in the nut (4) of the lock, and a corresponding bolt (46, 47) butt in the lock case. 19. Recessed lock (1) according to claim 18, characterized in that the stop bolts (46, 47) pass through the lock box (2), and are attached to its walls.