CA2314097A1

CA2314097A1 - Latch in which a latch bolt projects out of the housing

Info

Publication number: CA2314097A1
Application number: CA002314097A
Authority: CA
Inventors: Gunter Kotterheit
Original assignee: Individual
Current assignee: Dorma Deutschland GmbH
Priority date: 1998-08-28
Filing date: 1999-08-12
Publication date: 2000-03-09
Also published as: AU760886B2; PL193713B1; EE04688B1; WO2000012851A2; SK6022000A3; HK1039640A1; ATE283955T1; CN1316033A; HRP20000316B1; AU5514499A; HUP0004825A2; SK286469B6; HK1039640B; EP1049845B1; EP1049845A2; PL341678A1; DE19839043A1; CN1198998C; HRP20000316A2; DE59911192D1

Abstract

The invention relates to a lock (1) with a latch bolt (9) which protrudes from the lock housing (2). The tail (8) of the latch bolt, which is displaceably guided in the housing, can be pulled back through the action of an arm (20) of a spring-mounted pusher nut (21) and can be locked forwards and backwards through a locking action, by means of a key, a closing cylinder (45), a second nut (47, 49) or similar after a tumbler has first been lifted. A tumbler which can be lifted by a bit (46, 48) is configured in the form of a one-armed lever bar (24). Said lever bar forms turning recesses (25, 26) in which a turning pin (16) on the side of the latch bolt tail engages. The lever bar is mounted around a stay pin (29) located above a latch bolt head (10) on the housing side.

Description

..WO 00/12851 1 PCT/EP99/05873 Title: Latch in Which a Latch Bolt Projects Out of the Housing Description This invention relates to a latch or lock as described in the introduction to Claim 1, in which a latch bolt or spring bolt projects out of the latch housing, the latch bolt tail of which is movably guided in the latch housing and can be retracted by the action of an arm of a spring-mounted door handle nut and can be locked in the extended or retracted positions, after the lock has been actuated by means of key, a lock cylinder, a second nut or a similar device, after the lifting of a tumbler.
A latch of this type which is used as a lock for glass doors is available on the market. The latch bolt tail is mounted around a peg or pin or pivot of a tumbler that straddles it toward the back which cuts or intersects a lock engagement opening of the latch bolt tail and which tumbler projects with an end that is bent at a right angle into the range of motion of the nut. In this latch of the prior art, the tumbler is equipped with a locking device that, depending on the position of the latch bolt, lies in front of or behind a stop shoulder of the latch housing. In this configuration, the displacement of the latch bolt by means of the handle or push-button nut is always effected by means of the tumbler.
The object of the invention is to realize a latch or lock of the type above that has a simpler construction.
The invention teaches that this object can be accomplished by means of the characterizing features disclosed in Claim 1, whereby a tumbler that can be lifted by the locking beard or tooth is realized in the form of a one-armed bar that forms a recess for rotation, in which a rotating pin on the latch bolt tail side is engaged and which is mounted by means of a housing-side vertical peg or journal or cog that is located above the head of the latch bolt.
The lock that results from such a configuration is generally of the vertical type, which, in addition to a simple construction, is characterized by a reliable latching and locking action. The tumbler is now no longer mounted on the latch bolt tail, but on a housing-side vertical peg which is located above the latch bolt head. The opening forces that are exerted on the latch bolt head when the latch is locked in the extended position are now transmitted directly by means of the revolving pin into the tumbler and thus into the housing-side vertical peg, so that high reverse rotation forces can be absorbed without damage.
The locking of the latch bolt in the extended position or in the retracted position requires the prior lifting of the tumbler and the release of the revolving pin, so that the latch bolt can be closed by means of the locking beard or tooth that is engaged on the latch bolt tail. The invention teaches that the recess for revolution lies on the free end of the tumbler bar and that there is a contact point for the locking beard or tooth approximately in its center. Consequently, there is an advantageous lever action together with a smooth locking action.
An additional advantageous feature is that the tumbler bar is spring-mounted with respect to a housing side wall. The tumbler bar therefore assumes its specified limit position. On one hand, this arrangement makes it possible for the latch bolt to give way when a door that is equipped with the lock is pulled shut. On the other hand, when the latch bolt is locked in the extended position, its reverse movement is blocked by the tumbler bar.
An additional advantageous characteristic is that the latch bolt tail has a driving lug that is firmly connected with it, against which an arm of the door handle nut is i_n contact and which, when the latch bolt is the extended position, is displaced out of the range of rotation. In contrast to the prior art, both the locking beard or tooth a.nd also the door handle nut are in contact with the latch bolt tail. The tumbler is released by pressing on or pressure from the door handle nut. When the latch bolt is not locked in the extended position, the driving lug extends into the vicinity of the arm of the door handle nut. After the latch bolt has been locked in the extended position, on the other hand, the door handle nut is no longer under any load. When the latch bolt is pushed in the direction opposite to the spring load, the driving lug drives the arm with the door handle nut, so that the door handle nut always returns to its specified starting position.

An additional advantage in terms of a smooth and reliable locking action is that the driving lug has a diagonal sliding surface for contact with a lug on the arm. When the latch bolt is retracted with the door handle nut, therefore, the same lever ratios are always present. An additional advantageous characteristic is that the arm of the door handle nut is held by a spring in an orientation that runs parallel to the direction of the bolt displacement. Therefore, when it is pivoted, the door handle nut can make direct contact with the driving lug.
The invention teaches that on a latch or lock with a latch bolt that projects out of the latch housing, whereby the tail of the latch bolt is movably guided in the latch housing and can be retracted by the contact of an arm of a spring-mounted door handle nut, the invention further teaches that the spring force of the spring that applies a load to the door handle nut is adjustable. On account of this situation, it is possible to associate either a door handle or a rotary knob with the door handle nut. If the door handle nut is equipped with a door handle or push-button, the lever arm is longer, so that a greater spring force is desired. If, on the other hand, a rotary knob is used, the spring force can be set to a lower value, so that there is still an easy closing rotation of the rotary knob. For this purpose, there is a displaceable spring contact point that is fixed to the housing, and that can be displaced as appropriate from the outside of the housing. The invention further teaches that the spring is a tension spring that is engaged on the nut arm. The spring engagement point that is fixed to the housing is realized in the form of a pin that can be moved in the latch housing. To change the spring force, this pin can be moved between two positions in a slot. In particular, the pin is held in one of its two limit positions by a bayonet-type catch. For this purpose, on each end the pin has opposite-facing flattened zones, which in the one position run parallel to the slot walls in the slot segments of slots that are located in the lock cover and in the lock base, and in the other position are located in a slot segment that has a wider cross section at right angles to the slot walls. To vary the force of the spring, therefore, all that is necessary is to rotate the pin so that the flattened zones are in positions where they are aligned with the slot walls. For this purpose, the pin can be moved after being rotated 90°, or must first be moved to the 90° position. For this purpose, it has a tool engagement opening on its one end surface. This opening can be realized in the form of a slot, for example, for the insertion of the blade of a screwdriver. The pin is prevented from unintentionally moving out of position by the fact that the expanded segment of the slot forms support surfaces for plane contact with the peripheral segments of the flattened zones. In this version, too, the tail of the latch bolt can also be locked in the extended or retracted positions by actuating the lock beard or tooth following prior displacement of a tumbler.
There are control advantages that result from the fact that the latch bolt tail is guided so that it is in contact between the two lock side walls and is spring-mounted in the closing direction by a tension spring. Finally, an additional advan-tageous characteristic of the invention is that the door handle nut has a fork recess that defines a clearance or float and thus surrounds a stop pin on the latch housing side.
Several embodiments of the invention are explained in greater detail below by way of example, with reference to the accompany-ing schematic drawings, in which Figure 1 is a view of a lock or latch as claimed in a first embodiment, in which the latch bolt can be displaced both by means of a door handle as well as a shaped lock cylinder.
Figure 2 is an illustration like the one in Figure 1, but with the latch cover removed, showing the position in which the latch bolt can be retracted by means of the door handle nut.
Figure 3 is a follow-up to the illustration in Figure 2, whereby the latch bolt is retracted by means of the door handle nut.
Figure 4 is an illustration analogous to Figure 2, but with a latch bolt locked in the extended position.
Figure 5 is an illustration analogous to Figure 2, whereby the spring force that acts on the door handle nut is set to a lower value.

Figure 6 is an enlarged illustration of a detail along Line VI- VI in Figure 1.
Figure 7 is an illustration of a latch bolt in isolation.
Figure 8 is an overhead view like the one in Figure 7, in partial cross section.
Figure 9 is a view of the tumbler.
Figure 10 is an overhead view of the tumbler.
Figure 11 is a view of a second exemplary embodiment of a latch with the latch cover removed, whereby the latch bolt can be moved by means of the latch beard or tooth or bolt toe of a second nut, shown here in the normal position of the latch bolt.
Figure 12 is a view analogous to the one in Figure 11, namely with the latch bolt retracted by the door handle nut.
Figure 13 is a view of the latch bolt in the extended position.
Figure 14 is a view like the one in Figure 11, whereby the tension spring is engaged on the door handle nut with less spring force than in Figure 11.
Figure 15 is a view of a lock according to a third version, with the lock cover left off; here the push-nut grips are in the central area of the bolt tail.
Figure 16 is a representation as in Figure 15, but with the falling bolt pulled back by the push nut.
Figure 17 is a representation comparable to Figure 15, but in contrast here the push nut is exposed to a lesser spring force.
Figure 18 is a view of a lock according to a fourth version in which the falling bolt can be pulled back only by the push nut placed in the rear part of the lock, regarding the normal position of the falling bolt.
Figure 19 is a follow-up view of Figure 18, but in contrast here the falling bolt is pulled back by the push nut.
Figure 20 is a representation comparable to Figure 18, but here with a pull spring gripping with lesser force.
A latch as claimed in a first exemplary embodiment of the invention has a latch housing 2 that has an approximately rectangular outline, such that the length of the latch housing 2 is approximately twice the width of the latch housing. From a latch base 3, two vertical long side walls 4, 5 extend which are connected to each other in a rear portion of the latch housing 2 by a curved rear wall 6. On the other hand, a front wall 7 of the latch housing 2 runs at a right angle to the longitudinal side walls 4, 5.
A latch bolt tail 8 of a latch bolt 9 is guided in the latch housing 2 between the two latch side walls 4, 5, whereby the latch bolt head 10 provided with a latch bevel 10' extends through an opening 11 in the front wall 7. The tail 8 of the latch bolt 8 is in the shape of a fork or yoke. On a shorter leg 8" of the fork, the one end of a tension spring 13 is in contact with a peg 12 that extends from it . Its other end comprises a vertical peg 14 of the latch base 3, whereby the latch bolt 9 is spring-mounted in the extended direction.
Another fork leg 8" is approximately three times the length of the fork leg 8'. On the inside, the fork leg 8" forms a latch engagement opening 15. Located at some distance downstream of this fork leg is a rotating or revolving pin 16 that has an approximately rectangular cross section. Above the rotating pin 16, the fork leg 8" is provided in the terminal area with a slot 17 that runs in the direction of movement of the latch bolt, in which slot 17 is engaged a guide pin 18 that is located on the base side of the latch. On its free end, the fork leg 8" of the latch bolt tail 8 forms a driving lug 19, which is mounted so that it contacts an arm 20 of a door handle nut 21, which is mounted in the rearward portion of the latch housing 2 between the latch base 3 and a latch cover 22 that is oriented parallel to it. The driving lug 19 has a beveled or diagonal sliding surface 23 for contact with a lug 20' of the arm 20, whereby the lug 20', in the base position of the latch bolt 9, lies tight underneath the driving lug 19, so as not to interfere with the advancing movement of the latch bolt 9.
The normal position of the latch bolt 9 - See Figure 2 - is maintained by a tumbler bar 24. The tumbler bar 24 is realized in the form of a one-armed lever which, on its narrow side facing the revolving pin 16 is realized in the form of two rotational openings 25, 26 located one behind the other. These openings are separated by a center web 27. In the normal position of the latch bolt 9, the center web 27 extends in front of the rotating web or pin 16 and thus blocks the forward movement of the latch bolt 9. Adjacent to the rotational opening 26, the tumbler bar 24 forns a curved thickened tome 28, which projects into the latch engagement opening 15. The thickened zone repre-sents the locking tooth contact point, and extends approximately to the center of the one-armed tumbler bar 24. The other end of the tumbler bar 24 is mounted above the latch bolt heat 10 around a housing-side vertical peg 29. On the other hand, the rotating openings 25, 26 in question are located on the free end of the tumbler bar 24, which free end forms a bent portion 30. By means of this bent portion, the tumbler bar 24 is supported on a projection 31 on the lock base side, by which the tumbler beam 24 is held in a defined base position. A
compression spring 32 is in contact with the tumbler beam 24 and pushes it into the base position illustrated in Figure 2.
This compression spring 32, for its part, is supported on the housing side wall 4.
On its side opposite the arm 20, the door handle nut 21 has a fork-shaped recess 33 that defines a clearance or space into which a latch-housing-side stop peg 34 projects. In the base position of the latch 1, the position of the door handle nut 21 is as shown in Figure 2. This door handle nut 21 is held in position by a spring 35 which is in contact against the arm 20.
The spring 35 is designed as a lifting spring. The one end of the spring surrounds a peg lug 36 on the arm 20. On the other hand, the spring contact point P which is fixed to the housing can be adjusted to vary the spring force. For this purpose, the spring contact point P is movable. In this case, the spring 35 is a tension spring. The housing-side spring contact point P is formed by a pin 37 that can be moved in the housing 2. The pin 37 can be moved between two positions in a slot 38 in the base 3 of the lock and in the cover 22 of the lock. The orientation of the slot 38 runs in the direction of the arm 20 of the door handle nut 21. The slot 38 is configured so that the pin 37 is held in one of its two limit positions by a bayonet-type catch.
On one end, the pin 37 has flattened zones 39 that face each other. The distance between these flattened zones is sJ_ightly less than the distance between the parallel slot walls 40 of_ the slot segments 41 of the latch base 3 and the latch cover 22. The slot segment 41 is thereby closer to the arm 20 than a slot segment 42 which is wider than the slot segment 41. The inside wall of the slot segment 42 is adapted to the curvature of the outside wall of the pin 37. If the pin 37 enters the slot segment 42 and if the flat portions provided on the end of the pin 37 are oriented transverse to the path of the slot walls 40, there is an increased spring force of the spring 35 -see the extracted position of the pin 37 in Figure 6.
To prevent the pin 37. from inadvertently coming out of position, the expanded slot segment 42 in the latch base 3 and latch cover 22 forms support surfaces 43 for the plane contact of peripheral segments of the flattened zones 39. These support surfaces 43 are oriented transverse or at right angles to the slot walls 40.
Following a previous 90° rotation, the pin 37 can be moved into the position shown by the broken lines in Figure 6 and into the extracted position shown by the solid lines in Figure 5, so that the spring 35 is engaged with a lower force on the door handle nut 21. This case is selected if the door handle nut 21 is associated with a turning knob (not shown). On the other hand, if the door handle nut 21 is equipped with a door handle 44 as shown in the broken line in Figure 1, the position of the pin 37 ~nTO 00/12851 9 PCT/EP99/05873 is selected in which it is inserted in the widened slot segment 42. To move the pin 37 from outside, there are tool insertion openings 37' provided on the end of the pin 37, for the application of a screwdriver.
The latch bolt can be locked in the extended and retracted positions by means of a shaped lock cylinder 45 that runs through the latch cover 22 and the latch base 3. The latch beard or tooth 46 of the shaped cylinder 45 interacts with the tumbler bar 24 and with the lock engagement opening 15 of the latch bolt tail 8.
The device claimed by the invention functions as follows:
If a door (not shown) equipped with the latch 1 is pulled into its closed or locked position, the latch bolt 9, as a result of the bolt bevel 10', moves in the direction toward the inside of the lock, whereby the rotating pin 16 moves inside the rotation opening 25. In the closed position of the door, the latch bolt 9 can move into the base position as shown in Figure 2 on account of the tension spring that is acting on it. From this position, it is possible to retract the latch bolt 9 by actuating the push-button, as illustrated in Figure 3. A lug 20' of the arm 20 thereby pushes the sliding surface 23 of the latch bolt tail 8, and thus moves the latch bolt 9 inward in the lock. The rotational movement of the door handle nut 21 is restricted by the fact that a fork leg 33' acts on the stop peg 34 of the latch housing 2. During this process, the spring 35 is stretched, as is the tension spring 13 that is attached to the latch bolt 9. If the door handle 44 is released, the door handle nut 21 returns to its initial position, in which another fork leg 33"
presses the other side of the stop peg 34. The tension spring 13 also returns the latch bolt 9 into its basic position as illustrated in Figure 2.
If the door is only closed, it is possible to lock the latch bolt 9 in the extended position by means of the shaped lock cylinder 45. During the counterclockwise rotation of a locking beard or tooth 46, the locking beard or tooth presses against the thickened portion 28 and thereby lifts the tumbler bar 24, so that then the center web 27 is located above the rotational pin 16. Thus, by inserting the locking beard or tooth 46 into the lock engagement opening 15, the latch bolt 9 can be locked in the extended the position illustrated in Figure 4. During the locking rotation of the locking beard or tooth 46, the locking beard or tooth 46 releases the tumbler 24 for spring-assisted pivoting, so that its center web 24 moves behind the rotating pin 16, and thus the rotating pin 16 lies in the rotation opening 26. As a result, the latch bolt 9 cannot be pushed pack. Corresponding forces that attempt to push the latch back are transmitted by means of the tumbler bar 24 into the vertical peg 29 on the latch base side. The latch bolt 9 can only be moved back by actuating the key, and in particuJ_ar after the tumbler 24 h.as been lifted and the latch bolt 9 has been moved against the force of the tension spring 13.
If, instead of a door handle 40, a rotary knob (not shown) is used, the spring force applied to the door handle nut 21 must be reduced, whereby the pin 37 is moved into the position illustrated in Figure 5.
When the latch bolt is in the extended position, the driving lug 19 is located outside the path of movement of the arm 20 of the door handle 21, so that a movement of the door handle nut 21, either by means of a knob or a door handle 44, does not result in any contact.with the bolt tail 8.
The additional exemplary embodiment illustrated in Figures 11 to 14 is largely the same as the first exemplary embodiment.
Identical or equivalent components are therefore identified by the same reference numbers. One difference in this exemplary embodiment is, instead of the shaped lock cylinder 45, a second nut 47 that is mounted in the latch base 3 and the latch cover 22. A latch or lock 1' of this type can be used, for example, on the doors of toilet stalls. The second nut 47 is equipped with a locking beard or tooth 48, which acts in a manner similar to the locking beard or tooth 46 of the shaped lock cylinder 45 and is associated with two latch-housing-side stop shoulders 56, 57. In this latch 1', the second nut 47 is preferably equipped with a rotary knob on the inside of the door. In that manner, the latch bolt 9 can be retracted by means of the door handle nut 21, as in the first exemplary embodiment (See Figure 12). In addition, by means of the door-side handle knob that is associated with the second nut 47, the latch bolt 49 can be locked in the extended position, whereby its locking beard or tooth 48 interacts with both the tumbler bar 24 and the latch bolt tail 8. The result of this interaction is the position illustrated in Figure 13. The opening of a door equipped with the latch 1' first requires that the latch bolt 9 be retracted by means of the second nut 47. Then the latch bolt 9 can be pulled back all the way by means of the handle nut 21.
If a door handle 44 is associated with the handle nut 21, the pin 37 assumes the position illustrated in Figures 11 to 13. In that case, the spring is then in contact with greater force against the door handle nut 21. When a rotary knob is used for the door handle nut 21, the pin 37 must be moved into the position illustrated in Figure 14.
A lock 1" according to another version shown in Figures 15 through 17 has a falling bolt 9', which works exclusively like a trap. The falling bolt tail 8 forms only a fork leg 8". A
pull spring 13' grips there, too. In this version of the lock 1" there is no other way to keep it closed. There is also no push nut 21 in the rear part of the lock housing 2.
The falling bolt 9' is pulled back by a nut 49 gripping in the center part of the fork leg 8". An arm 50 of it acts together with a peg protuberance 51 of the falling bolt tail 8; the peg protuberance 51 is guided in a longitudinal slit 52 of the lock cover 22' shown in part. Opposite to the arm 50 there is the push nut 49, which is equipped with a second arm 53. This is where the spring 35 grips, which loads the nut 49 counter-clockwise. Two stopper shoulders 55, 55' at the bottom-side of the Lock limit together with two counter-shoulders 54, 54' of the nut the rotation of the nut 49. The point P where the spring grips on the side of the housing is designed the same way as the two versions described earlier. Only the orientation of the slit 38 has changed. It now runs in the direction of one arm 53.

According to Figures 15 and 16, the point P where the spring grips is in the slit section 42 with a larger cross-section.
This means that the spring 35 grips the nut 49 with greater force. The latter is therefore preferentially equipped with a push handle 44. By activating the push handle the nut 49 can be pushed into the position shown in Figure 16, a.nd its arm 50 pulls back the falling bolt 9' via the peg protuberance 51.
If the nut 49 shall be equipped with a turning knob not shown here, the point where the spring grips must be shifted so that the pin dips into the slit section 41 after a 90-degree rotation.
The other version of a lock 1 " ' illustrated in Figures 18 through 20 uses a push nut 21 as in the first two versions.
There is also a falling bolt 9' as found in the third version.
But in contrast thereto, the nut 49 is missing. With the push nut 21, only the falling bolt 9' can be pushed back as in the first two versions. According to Figures 18 and 19, the spring 35 is set to a greater force. Accordingly, the push handle 44 is attributed to the push nut 21. If a turning knob is placed with the push nut 21 the point where the spring grips (on the housing side) can be brought closer to arm 20, which was described in detail already with the first version.
An additional exemplary embodiment could be essentially the same as the first exemplary embodiment. Instead of a shaped lock cylinder 44, there would be a key insertion opening for a locking beard or tooth in the latch base 3 and the latch cover, by means of which the latch equipped with a tumbler bar can be locked.

Nomenclature 1 Latch or lock 1' Latch or lock 1 " Latch or lock 1 " ' Latch or lock 2 Latch or lock housing 3 Latch or lock base 4 Long side wall Long side wall 6 Rear wall 7 Front wall 8 Latch bolt tail 8' Fork leg 8" Fork leg 9 Latch bolt 9' Latch bolt 9 " Latch bolt Latch bolt head 11' Latch bolt bevel 11 Opening 12 Peg 13 Tension spring 13' Tension spring 14 Vertical peg Latch engagement opening 16 Rotating pin 17 Slot 18 Guide peg 18 Driving lug Arm 20' Lug 21' Door handle nut 22 Latch or lock cover 22' Latch or lock cover 23 Sliding surface 24 Tumbler bar 25 Rotation opening 26 Latch bolt 27 Center web 28 Thicker portion 29 Vertical peg 30 Angle bend 31 Lug 32 Compression spring 33 Fork recess 33' Fork leg 33" Fork leg 34 Stop peg 35 Spring 36 Feg lug 37 Pin 37' Tool contact opening 38 Slot 39 Flattened zone 40 Slot wall 41 Slot segment 42 Slot segment 43 Support surface 44 Door handle or door latch 45 Shaped lock cylinder 46 Latch beard or locking beard or locking tooth 47 Nut 48 Beard or tooth 49 Nut 50 Arm 51 Peg lug 52 Slot 53 Arm 54 Counter-shoulder 54' Counter-shoulder 55 Stop shoulder 55' Stop shoulder 56 Stopping pad 57 Stopping pad P Spring contact point

Claims

1. Latch or lock with a latch bolt (9,9',9") that projects out of a latch housing (2), whereby the latch bolt tail (8) that is movably guided in the latch housing (2) can be retracted by the contact of an arm (20) of a spring-mounted door handle nut (21), and can be locked in the extended or retracted positions by actuating the lock by means of a key, a lock cylinder (45), a second nut (47, 49) or similar device, after prior lifting of a tumbler, characterized by the fact that a tumbler that can be lifted by a beard or tooth (46, 48) is realized in the form of a one-armed tumbler bar (24) which forms rotational recesses (25, 26) in which a rotational pin (16) on the latch bolt tail side engages, and which is mounted around a housing-side vertical peg (29) that is located above a latch bolt head (10).

2. Latch as claimed in Claim 1, characterized by the fact that the rotational recesses (25, 26) lie on the free end of the tumbler bar (24) and there is a lock beard or tooth contact point (P) approximately in the middle of the tumbler bar.

3. Latch as claimed in one or more of the preceding claims, characterized by the fact that the tumbler bar (24) is spring-mounted with respect to one housing side wall (4).

4. Latch as claimed in one or more of the preceding claims, characterized by the fact that the latch bolt tail (8) has a driving lug (19) that is firmly connected with it, and on which an arm (20) of the door handle nut (21) is in contact, and which is displaced out of the pivoting range when the latch bolt (9) is locked in the extended position.

5. Latch as claimed in Claim 4, characterized by the fact that the driving lug (19) forms an inclined sliding surface (23) for the contact of a lug (20') of the arm (20).

6. Latch as claimed in one or more of the preceding claims, characterized by the fact that the arm (20) of the door handle nut (21) is held by a spring (35) in an orientation that is parallel to the direction of displacement of the latch.

7. Latch with a falling bolt (9, 9') emerging from a lock housing (2); it has a falling bolt tail (8) which can be moved within the lock housing (2) and pulled back by the grip of an arm (20) of a push nut (21) with a spring cushion and characterized by the fact that the force of the spring (35) cushioning the push nut (21, 49) can be regulated.

8. Latch according to claim 7 characterized by the fact that the point (P) on the housing where the spring grips can be moved.

9. Latch according to one or more of the preceding claims, characterized by the fact that the spring (35) is a pull spring gripping at the arm (20, 53).

10. Latch according to one or more the preceding claims, characterized by the fact that the point (P) on the housing where the spring grips is formed by a movable pin (37) in the lock housing (2).

11. Latch according to one or more of the preceding claims, characterized by the fact that the pin (37) can be moved between two positions in a longitudinal slit (38)

12. Latch according to one or more the preceding claims, characterized by the fact that the pit (37) is held in one of its two final positions by a bayonet-type lock.

13. Latch according to one or more of the preceding claims, characterized by the fact that the pin (37) is flattened on its opposite ends (39) which in one position run parallel to the slit walls (40) in the slit sections (41) between slits (38) running from lock cover (22, 22') and lock bottom (3); and in the other position are placed perpendicular to the slit walls (40) in a slit section (42) with a wider cross-section.

14. Latch according to one or more of the preceding claims, characterized by the fact that the enlarged slit section (42) forms support areas (43) for the level design of the border sections of the flattened parts (39).

15. Latch according to one or more of the preceding claims, characterized by the fact that the falling bolt tail (8) can be locked forward and back additionally by activating the closing beard after the movement of a closed position (closed-position bar 24).

16. Latch according to one or more of the preceding claims, characterized by the fact that the falling bolt tail (8) between the two lateral lock walls (4,5) is guided closely and is cushioned by a pull spring (13, 13') in the pre-closing direction.

17. Latch according to one or more of the preceding claims, characterized by the fact that the push nut (21) has a fork opening (33) defining a free movement and encloses a stopping peg (34) on the side of the lock housing.