The invention relates to a screw lock consisting of two legs having through holes, said legs being connected with a connecting part, said legs of the screw lock being passed through holes in one of the two plates of a door lock, said door lock being mounted in a recess in a door leaf, said legs of the screw lock being clamped against the holes in the door lock by means of screws.

Such a screw lock is used for stabilizing a door lock in a recess in a door leaf so as to avoid the situation that operation of a door handle in the door lock causes the lock to loosen in the door leaf.

DK Patent No. 161902 discloses a screw lock for a door lock consisting of two parts, where the first part is formed by two long, elliptical legs con¬ nected with an elliptical connecting part, said legs being intended to be passed through holes in the two plates of the door locks. When the legs have been passed through the plates, a guide washer having holes is mounted on the holes, and then screws are passed into the legs which are clamped against the boundaries of the holes in the plates.

DK Patent No. 174858 describes a screw lock of the type stated in the in¬ troductory portion of claim 1 , wherein the legs are relatively short, as they just extend halfway into the holes of a door lock, which means that two, al- though identical, screw locks have to be used on each side of the two par¬ allel plates of a door lock. When is a screw is passed into the one screw lock and further on toward the other screw lock, in order to prevent the lock part from sliding out of the holes, each of the legs of the screw locks is pro¬ vided with beads which ensure that the screw lock provided on the plate which does not receive the screws, does not drop out when the screws are screwed in from the opposite plate. This case, too, involves the use of two parts when a door lock is to be stabilized in a door leaf.

It is moreover noted that a new type of door locks has been developed, where the plates of the door locks have a smaller width and thus require a smaller recess in a door leaf in which the door lock is to be positioned, and these locks have found widespread use because, of course, it is desirable to minimize the depth of the recess in the door leaf as much as possible.

As a result of this smaller width of the plates of the door lock, the holes dis- posed closest to the recess in the bottom of the door leaf are configured as recesses, it being desirable for standardization purposes that the distance between the centres of the holes remains the same as in the previous door locks. Thus, it is not desirable to move the holes in the new type of door locks inwards in the plates to avoid a hole which is configured as a recess.

In other words, the reduction of the width of the plates of the door lock means that the holes disposed inwards toward the bottom of the recesses in the door leaf are intersected, i.e., as mentioned, configured as recesses.

Accordingly, an object of the invention is to provide a screw lock which con¬ sists of one part, and which ensures stable attachment of the door lock in a door leaf.

In addition, the stable attachment must be ensured in those cases where some of the holes in the plates of a door lock are configured as recesses.

The object of the invention is achieved by a screw lock of the type defined in the introductory portion, which is characterized in that the legs have a length corresponding to the distance between the two plates, so that the legs just extend through the holes in both plates, and that the axis of the through holes of the legs is disposed asymmetrically relative to the axis of symmetry of the legs.

This ensures a stable attachment of the door lock in the door leaf, since the forces affecting the legs of the screw lock are greatest inwards toward the edges of the holes where the wall thickness of the legs is smallest.

To ensure a particularly good attachment of the door lock in the door leaf, it is an advantage if, as stated in claim 2, the axis of the holes is parallel with an axis through the centre of the connecting part.

Particularly for the use of the screw lock in connection with holes which have an elongate configuration, and which are terminated at each end by semi-circles, it is an advantage if, as stated in claim 3, the legs are formed with an elongate section which is terminated by semicircular end parts.

For use of the screw lock in connection with door handle rosettes having a circular configuration, it is an advantage, as stated in claim 4, that the con¬ necting part is circular.

As mentioned, the invention also relates to use. This use is defined more fully in claim 5.

The invention will now be explained more fully with reference to the draw¬ ing, in which

fig. 1 shows a door lock mounted in a door leaf and having a screw lock according to the invention partially separated, in per¬ spective,

fig. 2 shows an example of a door lock which may be used in the door leaf of fig. 1 , fig. 3 shows a screw lock according to the invention, seen from the side, while

fig. 4 shows the screw lock of fig. 3, seen from above.

In figs. 1 and 2, the numeral 1 designates a section of a door leaf 1 , where a lock with a faceplate 2 flush with the front edge of the door leaf is mounted in a recess. This lock is surrounded by two parallel plates 4 having a distance which corresponds to the width of the recess in the door leaf 1. A latch bolt 3 and an auxiliary latch bolt 5 are arranged in holes in the face¬ plate 2, as is generally known.

A four-edged hole 16 is provided at the bottom of plate 4 for receiving a door handle (not shown), and a receiving mechanism is provided at the top of the plate to receive a lock with a key.

The door handle is stabilized to the door leaf by means of a screw lock, which may be made of an elastic, deformable material and consists of two legs 10, 11 , cf. also figs. 3 and 4, with through holes 18, 19 and a connect- ing part 8, which is preferably circular, although it may have other shapes, such as an elliptical shape.

The holes 18, 19 are intended to receive screws 15 which may be passed through screw holes 13 in a rosette 12, further through the holes 18, 19 in the legs 10, 11 of the screw lock, said legs 10, 11 being moved into elon¬ gate holes 6, 7 in the front plates 4 of the door lock. These legs 10, 11 have a length which corresponds to the distance between the parallel plates 4 of the door lock. Further, fig. 1 shows a support sleeve 14 through which a door handle (not shown) may be passed.

As will be seen in fig. 2, two types of door locks are indicated, the lock most common till now being the lock which comprises the area 9 defined by the outer dashed line, while a newer type of door lock is defined by the inner solid line. The decisive difference between the two types of locks is that the newer type of lock has a smaller width than the common type, which means that the recess to be provided in the door leaf requires a smaller depth.

It will moreover be seen that the hole 7 in the plate 4 in the new type of door lock appears as an elongate recess, which is an advantage, since the new type of lock can also replace the common type of lock, as the distance between the holes and the recesses in the new type of lock correspond to the distance between the holes in the common type of lock. This is an ad¬ vantage in particular if the common type of lock is to be replaced.

As will be seen from fig. 4, the holes 18, 19 in the legs 10, 11 of the screw lock are disposed asymmetrically relative to the longitudinal axes of sym¬ metry of the legs, whereby the legs relative to the circumference have a varying wall thickness, viz. a relatively thick wall thickness shown at 20 and 21 and a somewhat smaller wall thickness shown at 22, 23.

As will be seen, the thick part of the wall is configured symmetrically relative to a plane which contains the axis of symmetry of the screw lock and the axes of symmetry of the legs 10, 11.

Particularly in connection with the above-mentioned new type of lock where some of the holes 7 are configured as elongate recesses, it is an advantage to shape the legs as shown in fig. 4, since screws passed into the legs will exert a pressure inwards against the edge of the recesses 7, as the thick wall parts prevent a pressure from being directed out of and away from the longitudinal recess.

If, in addition, the outer geometry of the legs corresponds closely to the ge- ometry of the recess, a stable attachment of the screw lock in the holes and particularly the recesses of the plates is ensured.