DE29720217U1 - Latch lock with crank latch - Google Patents

Description

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Mayer 8s Co. M 4624 - Dt/Fa

Latch lock with crank latch

The present invention relates to a latch lock with a crank latch that is slidably arranged in the lock housing, which comprises a latch tail, a latch head with a recess and a stop element that is pivotably mounted in the recess about a pivot axis provided in a latch-proof manner, wherein the stop element has a starting section that runs against a door frame or a strike plate arranged on a door frame when a door provided with the latch lock is closed in order to pivot the stop element in the pivoting direction, and a support section that engages behind a counter stop provided on the side of the lock housing and is supported on the counter stop at least when the starting section runs against the door frame or the strike plate, and wherein the pivoting movement of the stop element against the pivoting direction is limited by a limiting element.

Locks of this type are well known and have the advantage that they allow doors to be closed easily and almost silently. This is why such locks with crank latches are used in hospitals or other facilities where quiet closing of doors is required.

The recess in the latch head is usually designed as a milled recess, which is located in the middle of the latch head parallel to the longitudinal

axis of the crank latch. To form the counter stop for the support section of the stop element pivotably mounted in the recess, a recess must usually be formed on the lock pocket in the door leaf, flush with the faceplate cutout, which when the lock is inserted, lies in the area of the crank latch, so that the support section of the pivotably mounted stop element protruding beyond the lock housing comes to rest in this recess and has sufficient play for pivoting the stop element.

The disadvantage of such latch locks with crank latches is that they cannot be switched from right to left. Because the support section of the latch element protrudes laterally beyond the lock housing and thus forms an undercut, it is not possible to pull the crank latch out of the guide opening in the faceplate from the front. Another disadvantage is that the aforementioned recess in the lock pocket must be provided for the support section of the latch element that protrudes beyond the lock housing. This means that installing a latch lock with crank latch is not possible without the appropriate expertise, and providing a recess in the lock pocket of the door involves a considerable amount of work and is therefore undesirable.

To switch from left to right opening, the known latch locks with crank latch must be removed from the door leaf and also disassembled, whereupon the crank latch must be removed and turned 180° and then reinserted into the lock housing. After assembling the lock housing, an additional hole must be drilled into the lock pocket in the door leaf on the side opposite the recess mentioned above.

A further recess must be milled or chiselled out on the opposite side, into which the support section of the stop element can engage after the lock housing has been inserted into the lock pocket.

The object of the invention is to design a latch lock with a crank latch of the type mentioned at the beginning in such a way that a simple changeover from left to right stop is possible, while at the same time the installation of the latch lock in a lock pocket of a door leaf is easy to carry out without special rework and specialist knowledge.

This task is solved on the basis of a drop lock of the type mentioned at the beginning in that, when the support section is in contact with the counter stop, there is a free space between the limiting element and the section of the stop element that interacts with the limiting element, into which the stop element can be pivoted so far that the counter stop is no longer engaged behind by the support section.

By creating a free space according to the invention between the limiting element and the section of the stop element that interacts with the limiting element, it is possible to pivot the stop element so far that the counter stop is no longer engaged by the support section. By pivoting the stop element a corresponding distance, the blocking effect of the undercut formed by the starting section can be eliminated, so that the crank latch can be pulled out to the front through its guide opening formed in the faceplate. After a rotation of 180° around its longitudinal axis, the crank latch can then

with its latch tail pushed through the faceplate into the lock housing until, after the stop element has been pivoted accordingly, its support section again engages behind the counter stop formed on the lock housing, so that the crank latch is secured again in the lock housing.

In principle or in addition, the securing of the crank latch against deliberate or accidental removal from the front of the lock housing can also be ensured by other securing means, which can, for example, engage the latch tail. The only important thing is that the support section of the stop element is pivoted when the door is closed and the associated impact against a door frame or a strike plate arranged on a door frame so that the support section engages behind the counter stop provided on the lock housing, so that a counter bearing is formed for the pivot axis of the stop element, which lies within the lock housing and faceplate dimensions.

The latch lock designed according to the invention makes it very easy to change a lock with a crank latch from left to right stop, whereby neither the lock housing has to be removed from the door leaf nor is it necessary to dismantle the lock housing to change the crank latch.

According to an advantageous embodiment of the invention, an opening designed as a perforation or recess is provided on the side of the lock housing, into which the support section engages, the counter stop being formed by an edge of the opening and when closing

••«••9 · » · ·«* ·

swiveling the stop element into the free space the support section completely emerges from the opening.

In this way, a very simple and cost-effective design of the counter stop is possible, since only an opening has to be provided in the lock housing to form the counter stop. In order to enable easy adjustment of the lock latch, a second opening is advantageously provided on the opposite side of the lock housing, which essentially corresponds to the first opening, in which the support section of the stop element comes to rest after the lock latch is turned over.

According to a further preferred embodiment of the invention, the support section is arranged essentially completely within the outer contour of the lock housing both in its position against the counter stop and when the stop element is pivoted. This means that the milling or similar of a recess in the lock pocket in the door leaf can be dispensed with, since it is guaranteed that when the stop element is pivoted, it does not protrude beyond the outer contour of the lock housing. A latch lock designed according to the invention can thus be inserted into the lock pocket of a door leaf without recesses in the form of milling or chiseling having to be subsequently provided on it. In particular, such a latch lock can thus be inserted into existing door leaves without great effort, so that retrofitting with a latch lock designed according to the invention with a crank latch is possible without any problems.

According to a further advantageous embodiment of the invention, the limiting element is formed by the bottom surface of the recess located at the end of the latch. This results in a very simple and cost-effective design of the crank latch, since no separate parts have to be provided for the limiting element. In principle, however, it is also possible for pins or the like to be provided as the limiting element, for example, which protrude into the recess in the latch head and against which the stop element comes to rest after it has been completely pivoted.

A further solution to the stated problem is achieved starting from a latch lock of the type mentioned at the beginning in that the counter stop is formed by a separate part which can be switched from a locking position, in which the counter stop is engaged from behind by the support section of the stop element, to a release position in which the counter stop is not engaged from behind by the support section of the stop element.

In this solution according to the invention, the undercut formed by the support section of the stop element is not achieved by pivoting the stop element, but by adjusting the counter stop. The adjustability is selected in such a way that in a release position the counter stop is not engaged by the support section of the stop element, so that in this position of the counter stop the crank latch can be pulled forwards out of its guide opening formed in the faceplate.

After a 180° rotation around the longitudinal axis of the crank latch, it can be inserted with its latch tail through the opening in the faceplate into the lock housing, so that after the counter-stop has been moved from its release to the locking position, it is again secured against removal from the lock housing.

Preferably, the separate part is designed as a frame part with an opening for the crank latch, whereby the frame part is detachably attached to the outside of the faceplate, in particular screwed, and at least one of the side edges of the opening forms the counter stop for the stop element. In this way, the counter stop can be very easily switched between its release and its locking position. In particular, the release position can consist of the frame part being completely unscrewed from the faceplate. However, it is also conceivable, for example, for the frame part to be folded away from the faceplate.

According to a further advantageous embodiment of the invention, a projection is formed on the edge that projects into the opening and forms the counter stop. In this case, an extension is advantageously formed on the edge, in particular in the area of the projection, which extends towards the interior of the lock housing, in particular into the lock housing.

The projection protruding into the opening ensures that the counter stop forms a sufficient support surface for the support section of the starting section. In particular, the opening of the frame part can be made relatively wide so that the lock latch

except in the area of the base with a maximum width.

According to a further preferred embodiment of the invention, the counter stop is designed as an eccentric, which is mounted in particular on the faceplate or on the lock housing and can be pivoted between the locking position and the release position. However, the counter stop can also be designed, for example, as a bayonet pin, which is mounted in particular on the faceplate or on the lock housing and can be adjusted between the locking position and the release position. The eccentric or the bayonet pin can advantageously be locked at least in the locking position. It is important that the part forming the counter stop can be locked in its locking position in such a way that it absorbs the force acting on the counter stop from the support section of the stop element, which usually acts from the inside of the lock housing essentially in the longitudinal direction of the lock latch onto the back of the counter stop, so that the crank latch is pushed into the inside of the lock housing by pivoting the stop element.

According to a further advantageous embodiment of the invention, a spring element is provided between the stop element and the latch head, by means of which the support section of the stop element is pre-tensioned against the counter-stop, particularly when the latch is fully extended. The spring element ensures that the stop element is in a position, particularly when the latch is fully extended, in which the counter-stop is securely engaged by the support section of the stop element. This ensures that the latch cannot accidentally come out of the lock housing.

Furthermore, the spring element prevents the stop element from rattling.

The spring element can, for example, be designed as one piece with the stop element, in particular be molded onto it. However, it is also possible for the spring element to be designed as a separate part and to be arranged under pre-tension between the stop element and the trap head.

The spring element can be designed as a leaf spring-like element that extends along one side of the stop element, or can also be formed by a helical spring-like element, for example.

Further advantageous embodiments of the invention are specified in the subclaims.

The invention is explained in more detail below using exemplary embodiments with reference to the drawings, in which:

Figure 1 is a side view of a crank latch according to the invention,

Figure 2 shows a partial cross-section through the crank latch according to Figure 1 along the line A-A,

Figure 3 shows the cross-section according to Figure 2, with the crank latch retracted,

Figure 4 shows the cross-section according to Figures 2 and 3 with the stop element pivoted for removal,

Figures 5 to 8 show different views of another embodiment of the invention

Figure 1 shows a lock latch designed as a crank latch 1, which comprises a latch tail 2 and a latch head 3. In the front side of the latch head 3, a recess 4 is formed in the middle, which extends essentially along the longitudinal axis 5 of the crank latch and has essentially parallel side walls 6.

A stop element 7 is arranged in the recess 4 and is pivotably mounted in the latch head 3 via a pivot axis 8.

The crank latch 1 is inserted with its latch tail 2 through a guide opening 10 formed in a faceplate 9 into a lock housing 47, which comprises a lock case 31 and a lock cover 21, as can be seen in Figure 8. Two symmetrically formed projections 13 are formed on the latch tail 2, each of which can form a stop 14 for fixing the crank latch 1.

From the view according to Figure 2, it can be seen that the stop element 7 comprises an essentially triangular base body 15, which is mounted in the area of one of its corners on the pivot axis 8. A long side 17 of the triangular base body 15 has, for example, an arc-shaped, concave course, whereby the side facing the exposed corner 16 of the triangular

The part of this side surface located towards the base body 15 forms a run-on section 18.

The corner 19 of the triangular base body 15 formed at the other end of the long side 18 is hook-shaped and comprises a support section 20 which engages in an opening 22 formed in the side lock cover 21 of the lock housing 47. The opening 22 is limited towards the front end of the lock housing 47 by an edge 23 of the faceplate 9, with the support section 20 of the stop element 7 resting against the edge 23 forming a counter stop 24.

The long side 26 of the base body 15 formed between the corner 19 and the bearing corner 25 of the triangular base body 15 runs essentially parallel to the bottom surface 28 of the recess 4 forming a limiting element 27, which in turn runs essentially parallel to an inclined surface 29 formed on the front side of the trap head 3.

A free space 37 is formed between the bottom surface 28 and the long side 26 of the triangular base body 15, into which a leaf spring-like spring element 30 formed on the triangular base body 15 projects. The spring element 30 is connected to the triangular base body 15 in the area of the pivot axis 8 and rests with its free end on the bottom surface 28 of the recess 4, so that the support section 20 rests on the counter stop 24 under spring preload.

In the lock case 31, an opening 32 is formed symmetrically to the opening 22 in the lock cover 21, the end of which is located towards the front end of the lock housing 47 and is also limited by an edge 34 of the faceplate 9 forming a counter stop 33.

Figure 3 shows the position of the crank latch 1, which it assumes when, for example, by closing a door, the starting section 18 of the stop element 7 is pressed against a door frame or a strike plate, so that the stop element 7 pivots about the pivot axis 8 in a pivoting direction shown by an arrow 35. When the stop element 7 pivots, it is supported by its support section 20 on the counter-stop 24, so that due to the forces transmitted to the crank latch 1 via the pivot axis 8, it is pushed into the lock housing 47 along an arrow 36.

As can be seen from Figures 2 and 3, the support section 20 forms an undercut opposite the counter stop 24 both in the basic position shown in Figure 2, in which the latch head 3 protrudes completely from the lock housing 47, and in the retracted position shown in Figure 3.

In order to enable the crank latch 1 to be removed, the stop element 7 is pivoted against the pivoting direction 35 against the spring force of the spring element 30, so that the long side 26 of the stop element 7 is pivoted into the free space 37 until it comes to rest on the bottom surface 28 of the recess 4 forming the limiting element 27, as shown in Figure 4.

In this position, the counter stop 24 is no longer engaged by the support section 20, so that the crank latch 1 can be pulled out of the lock housing 47 from the front along an arrow 38. After the crank latch 1 has been rotated by 180° around its longitudinal axis, the crank latch 1 can be inserted again through the guide opening 10 into the lock housing 47.

The process of inserting and removing the crank latch designed according to the invention is described in more detail with reference to Figures 2 to 4:

For insertion, according to Figure 4, the stop element 7 is pivoted against the pivoting direction 35 until the stop element 7 comes to rest with its long side 26 on the bottom surface 28 of the recess 4. In this position, the support section 20 does not form an undercut for the counter stop 24, so that the crank latch 1 can be pushed along the arrow 36 into the lock housing 47 until the position shown in Figure 4 is reached.

In this position, the stop element 7 is released, whereby it is moved in the pivoting direction 35 due to the tension of the spring element 30 until the support section 20 comes into contact with the counter stop 24. In this way, the crank latch 1 is secured in the lock housing 47, as shown in Figure 2.

In addition, a further removal protection device can be provided, for example, which interacts with the stop 14 formed on the latch tail 2, which prevents the crank latch 1 from being removed from the lock housing.

se 47 is also prevented if the stop element 7 is pivoted against the pivoting direction 35. This can ensure that, for example, if the spring element 30 becomes loose or breaks, the crank latch 1 is prevented from accidentally coming out of the lock housing 47.

Figures 5 to 8 show a further embodiment of the invention. Components that are already shown in Figures 1 to 4 are designated with the same reference numerals as in Figures 1 to 4.

According to Figure 5, a recess 38 is formed on the front of the faceplate 9, in which a frame part 39 is arranged and connected via screws 40 through the faceplate 9 to a front, bent lock case part 11 of the lock case 31. The recess

38 and the frame part 39 are designed in such a way that when the frame part 39 is inserted into the recess 38, their outer surfaces are essentially flush with one another, so that when the frame part 39 is inserted, the faceplate 9 has a continuous, smooth surface.

As can be seen from Figure 6, a guide opening 41 is formed in the frame part 39, with projections 43 projecting into the center of the opening 41 being formed on the lateral edges 42 of the opening 41. The projections 43 are arranged centrally on the lateral edges 42 and are essentially symmetrical to the longitudinal axis of the frame part.

39 trained.

As can be seen from Figure 7, the lugs 43 also extend essentially at right angles to the surface of the frame part 39, so that an extension 44 is present on the lugs 43 which extends towards the interior of the lock housing 47 when the frame part 39 is fastened to the faceplate 9.

From Figure 8 it can be seen that the edge 45 of the extension 44 directed towards the middle of the housing forms a counter stop 46 for the support section 20 of the stop element 7, so that in the position of the crank latch 1 shown in Figure 8, the support section 20 comes to rest on the counter stop 46 and engages behind it. The front removal of the crank latch 1 from the lock housing 47 is thus prevented by the undercut formed by the support section 20 and in the counter stop 46.

In order to enable such removal, the screws 40 are loosened, whereupon the frame part 39 can be removed from the faceplate 9. Since the corner 19 of the stop section 7 and the support section 20 in the position of the stop element 7 shown in Figure 8 only extend laterally so far that they are arranged completely within the inner contour of the lock housing 47 and the opening 10 formed in the faceplate 9, after removing the frame part 39, the crank latch 1 can be removed from the front of the lock housing 47.

While in the embodiment shown in Figure 8 the support section 20 of the stop element 7 cannot extend to the outer edge of the lateral lock cover 21, since in this case

If the faceplate 9 were also to be engaged behind by the support section 20 in addition to the counter stop 46, it is also conceivable in principle to form the faceplate 9 in two parts, for example, so that the openings 22 and 32 extend as far as the frame part 39. In this case, the support section 20 of the stop element 7 can extend as far as the outer contour of the side lock cover 21 or the lock case 31, since after removing the frame part 39, the undercut for the support section 20 of the stop element 7, which is formed exclusively by this, is removed.

After removing the crank latch 1, it can be rotated 180° around its longitudinal axis as already described and then reinserted into the lock housing 47. The frame part 39 is then placed back on the faceplate 9 and screwed to it so that the support section 20 of the stop element 7 now engages behind the counter stop 46 arranged on the other side of the lock housing 47 and formed on the frame part 39. Removal of the crank latch 1 is therefore impossible when the frame part 39 is fixed.

Mayer & Co.

M 4624 - Dt/Fa

List of reference symbols

1 Crank latch 2 Fallen tail 3 Trap head 4 Recess 5 Longitudinal axis 6 side walls 7 Stop element 8th Swivel axis 9 Faceplate 10 Guide opening 11 Lock case part 12 Guide opening 13 Approach 14 attack 15 triangular body 16 Corner 17 Longitudinal axis 18 Start-up section 19 Corner 20 Support section 21 Lock cover 22 opening 23 Edge

24 Counter stop 25 Storage corner 26 Long side 27 Limiting element 28 Floor area 29 Inclined surface 30 Spring element 31 Lock case 32 opening 33 Counter stop 34 Edge 35 Arrow 36 Arrow 37 free space 38 deepening 39 Frame part 40 Screws 41 Guide opening 42 side edge 43 Approach 44 Extension 45 Edge 46 Counter stop

47 Lock housing

Claims (25)

protection claims; 1. Latch lock with a crank latch (1) which is arranged displaceably in the lock housing (47), which comprises a latch tail (2), a latch head (3) with a recess (4) and a stop element (7) which is pivotably mounted in the recess (4) about a pivot axis (8) provided fixed to the latch, wherein the stop element (7) has a starting section (18) which, when a door provided with the latch lock is closed, runs against a door frame or a striking plate arranged on a door frame in order to pivot the stop element (7) in the pivoting direction (35), and a support section which engages behind a counter stop (24, 33) provided laterally on the lock housing (47) and is supported on the counter stop (24, 33) at least when the starting section (18) runs against the door frame or the striking plate, and wherein the pivoting movement of the stop element (7) counter to the pivoting direction (35) is limited by a limiting element (27),
characterized in that, when the support section (20) rests against the counter-stop (24, 33), there is a free space (37) between the limiting element (27) and the section (26) of the stop element (7) which interacts with the limiting element (27), into which the stop element (7) can be pivoted to such an extent that the counter-stop (24, 33) is no longer engaged behind by the support section (20). 2. Latch lock according to claim 1, characterized in that an opening (22, 32) designed as a through-hole or recess is provided laterally in the lock housing (47), into which the support section (20) engages, that the counter-stop (24, 33) is formed by an edge (23, 34) of the opening (22, 32) and that when the stop element (7) is pivoted into the free space (37), the support section (20) emerges completely from the opening (22, 32). 3. Latch lock according to claim 1 or 2,
characterized in that the limiting element (27) is formed by the bottom surface (28) of the recess (4) located at the falling end. 4. Latch lock with a crank latch (1) which is arranged displaceably in the lock housing (47) and which comprises a latch tail (2), a latch head (3) with a recess (4) and a stop element (7) which is pivotably mounted in the recess (4) about a pivot axis (8) provided fixed to the latch, the stop element (7) having a starting section (18) which, when a door provided with the latch lock is closed, runs against a door frame or a strike plate arranged on a door frame in order to pivot the stop element (7) in a pivoting direction (35), and a support section (20) which engages behind a counter stop (46) provided on the side of the lock housing (47) and is supported on the counter stop (46) at least when the starting section (18) runs against the door frame or the strike plate, characterized in that the counter-stop (46) is formed by a separate part (39) which can be switched from a locking position, in which the counter-stop (46) is engaged from behind by the support section (20) of the stop element (7), to a release position, in which the counter-stop (46) is not engaged from behind by the support section (20) of the stop element (7). · 1 5. Latch lock according to claim 4, characterized in that the separate part is designed as a frame part (39) with a guide opening (41) for the crank latch (1), that the frame part (39) is detachably fastened, in particular screwed, to the outside of the faceplate (9) and/or to the lock case part (11), and that at least one of the lateral edges (42) of the opening forms the counter stop (46) for the stop element (7). 6. Latch lock according to claim 5, characterized in that a projection (43) projecting into the opening (41) is formed on the edge (42), by which the counter-stop (46) is formed. 7. Latch lock according to claim 6, characterized in that an extension (44) is formed on the edge (42), in particular in the region of the projection (43), which extends towards the interior of the lock housing (47), in particular into the lock housing (47). 8. Latch lock according to one of claims 5 to 7, characterized in that the frame part (39) is designed to be displaceable in the longitudinal direction of the faceplate (9) for switching between the locking and release positions. 9. Latch lock according to one of claims 5 to 8, characterized in that the frame part (39) is completely removable from the faceplate (9) for switching between the locking and release positions. 10. Latch lock according to one of claims 5 to 9, characterized in that the lateral outer edges of the frame part (39) are substantially flush with the outside of the lock housing (47). 11. Latch lock according to one of claims 5 to 10, characterized in that the frame part (39) can be inserted into a recess (38) provided in the outside of the faceplate (9) and in particular that when the frame part (39) is inserted, the surface of the frame part (39) runs essentially flush with the front side of the faceplate (9). 12. Latch lock according to claim 4, characterized in that the counter stop is designed as an eccentric which is mounted in particular on the faceplate or on the lock housing and which can be pivoted between the locking position and the release position. 13. Latch lock according to claim 4, characterized in that the counter-stop is designed as a bayonet pin which is mounted in particular on the faceplate or on the lock housing and which is adjustable between the locking position and the release position. 14. Latch lock according to claim 12 or 13,
characterized in that the eccentric or the bayonet pin can be locked at least in the locking position. 15. Latch lock according to one of the preceding claims, characterized in that the support section (20) is arranged substantially completely within the outer contour of the lock housing (47) both in its position resting on the counter stop (24, 33, 46) and when the stop element (7) is pivoted. 16. Latch lock according to one of the preceding claims, characterized in that a spring element (30) is provided between the stop element (7) and the latch head (3), by means of which the support section (20) of the stop element (7) is prestressed against the counter-stop (24, 33), in particular when the latch (1) is fully extended. 17. Latch lock according to one of the preceding claims, characterized in that the latch head (1) has an inclined surface (29) at its free end and the bottom surface (28) of the recess (4) runs substantially parallel to the inclined surface (29). 18. Latch lock according to one of the preceding claims, characterized in that the recess (4) has substantially the shape of a parallelepiped. 19. Latch lock according to one of the preceding claims, characterized in that the stop element (7) comprises a substantially triangular base body (15). 20. Latch lock according to claim 19, characterized in that one of the side surfaces (17) of the triangular base body (15) is curved, in particular concave. 21. Latch lock according to claim 18 or 19, characterized in that the support section (20) is formed in the region of a corner (25) of the triangular base body (15). V · 22. Latch lock according to one of claims 16 to 21, characterized in that the spring element is formed integrally with the stop element, in particular is molded onto it. 23. Latch lock according to one of claims 16 to 21, characterized in that the spring element is designed as a separate part. 24. Latch lock according to one of claims 16 to 23, characterized in that the spring element (30) is designed as a leaf spring-like element which extends along one side (26) of the stop element (7). 25. Latch lock according to one of the preceding claims, characterized in that counter stops (24, 33, 46), in particular symmetrically designed, are provided on both sides of the lock housing (47).