Such cylinder locks are known. The above described construction of this cylinder lock permits a kit-type combination of lock cylinders and connecting bridge.

Various lock cylinders and in particular lock cylinders of different lengths can be combined with one another according to the connecting bridge. It is also possible to combine only one lock cylinder with one closing element by means of a particular connecting bridge. By means of particular extension pieces and connecting bridges of appropriate length, cylinder locks with extremely long special dimensions can be constructed.

It is known from DE 197 53 013 to arrange projections on the connecting bridge on the arm side, which projections are connected with interlocking fit to the flange region of a lock cylinder.

The object of the invention is to improve a generic cylinder lock in terms of production teclmology.

The object is achieved by the invention described in the claims.

The solution described in claim 1 provides that the recesses are arranged in the groove side wall and are sections of circular cylindrical holes. According to this design the engagement with interlocking fit between connecting bridge and flange region of the lock cylinder can be produced favourably. Claim 2 provides that the connecting bridge consists of a plurality of components for constructing cylinder

locks of different axial lengths. According to this design the production of the cylinder lock is simplified, the number of connecting bridges to be kept ready is reduced as these can also be constructed in kit-like manner from different components. In a development of the invention it is provided that the recesses are end sections of the housing pin holes. This is particularly advantageous when the holes are arranged in a double row. In this case the holes of the rows can be offset from one another, so the arm has a zigzag wave structure. To produce the groove the holes are initially introduced into the flange region of the lock cylinder. These holes are preferably housing pin holes. It is, however, possible to design the holes which form the recesses with only a limited depth. This is advantageous when the lock cylinder has only one row of housing pin holes which can rest in particular in the longitudinal central plane. The groove is then preferably introduced by a groove milling cutter, so the two rows of holes are touched by the groove milling cutter and recesses with a semi-circular basic shape remain. The arm is held in the groove in that a grub screw is screwed into the groove wall, which can enter with its tip into indentations of the arm.

In a first variation the connecting bridge is formed as one part. It has a web which has a screw opening for the sleeve screw and which is arranged beneath the closing element. Arms emanate in each case from the web and are anchored in the flange region of the lock cylinder. The web, however, has a peripheral contour which is adapted to that of the flange section of the lock cylinder. In accordance with a preferred variation of the invention which has independent significance, the connecting bridge consists of a plurality of components. These components can be detachably connected to one another, in particular by means of screws. In this case the arm can be formed by a first component and the web by a second component.

According to this design a web can be combined with arms of different lengths. It is, however, also possible to combine the web with an arm on one side only. In this case it is also possible that the web itself forms an arm from the same piece of material and can be combined with a second arm. The web can preferably be extended by means of intermediate pieces. The components can be such that they can be inserted in one another. To this end the components preferably have end openings in which trunnions can be inserted. The intermediate pieces can in this case form both an end opening and a trunnion. The trunnion inserted in an end opening is preferably held by a

fastening screw crossing the end opening wall and the trunnion inserted in the end opening. The web can form a separate component. This can form an opening at both ends in each case, a journal in each case or an opening on the one side and a journal on the other side.

Embodiments of the invention will be described below with the aid of the attached drawings, in which: Fig. 1 shows a side view of a cylinder lock with two lock cylinders of a first embodiment, Fig. 2 shows the bottom view of the first embodiment, Fig. 3 shows the front view of the embodiment, Fig. 4 shows the connecting bridge of the first embodiment in top view, Fig. 5 shows the connecting bridge in side view, Fig. 6 shows a second embodiment of a lock cylinder in bottom view, Fig. 7 shows the second embodiment in side view, Fig. 8 shows a further embodiment of a connecting bridge in top view, Fig. 9 shows the connecting bridge in accordance with Fig. 8 in the side view, Fig. 10 shows a further embodiment of a cylinder lock in bottom view, Fig. 11 shows the embodiment in accordance with Fig. 10 in side view, Fig. 12 shows an embodiment of a component of a connecting bridge in top view, Fig. 13 shows a section in accordance with the line XIII-XIII in Fig. 12, Fig. 14 shows the embodiment in accordance with Fig. 12 in side view, partially in section, Fig. 15 shows a section in accordance with the line XV-XV in Fig. 14, Fig. 16 shows a further embodiment of a component of a connecting bridge in top view, Fig. 17 shows the embodiment in accordance with Fig. 16 in side view, Fig. 18 shows a further embodiment of a component of a connecting bridge, Fig. 19 shows a further embodiment of a component of a connecting bridge, Fig. 20 shows a section in accordance with the line XX-XX in Fig. 19,

Fig. 21 shows a section in accordance with the line XXI-XXI in Fig. 19, Fig. 22 shows a further embodiment of a component of a connecting bridge in top view and Fig. 23 shows the embodiment in accordance with Fig. 22 in side view.

The cylinder lock illustrated in Fig. 1 to 3 has two lock cylinders 1,2. A closing element 3 is located between the two lock cylinders, which closing element can be rotated by activating the lock cylinder. The two flange regions of the lock cylinders 1, 2 are connected to one another by means of a connecting bridge 4.

The connecting bridge, which is illustrated in Fig. 4 and 5, has a web 5 which is located at the axial height of the closing element 3 and which forms the sleeve screw thread hole 10. The web 5 has a cross-section which is adapted to the cross-section of the adjacent flange section of the lock cylinder 1, 2. Arms 6 are connected to the ends of the web 5 in each case. The arms 6 have a cross-section which is reduced with respect to the web 5 and form undulating projections 7 on the arm side wall. The projections 7 are arranged on the two opposing long sides of the arm 6 and are offset from one another. The projections 7 have a semi-cylindrical shape.

Each of the two lock cylinders 1,2 forms a bottom groove 9, in other words, a groove located in the region of the curve, in its flange region. The groove is located on the side remote from the cylinder core. This groove has recesses 8 in its groove wall which have a semi-circular shape. The shape of the recesses 8 is adapted to the shape of the projections 7, so the arm 6 can be inserted in the groove 9 with a corresponding shape.

In the embodiment illustrated in Fig. 1 to 3 the recesses 8 are formed by the ends of the pin holes 23. The lock cylinders 1,2 have two rows of pin holes in each case. The holes are offset from one another. The projections 7 form, to a certain extent, the closures to the pin holes. For safety reasons a pin hole covering (not illustrated) is inserted in the groove, however, which forms the base of the groove.

In the embodiments illustrated in Fig. 6 and 7 only one row of pin holes 23 is provided in each of the two lock cylinders 1,2. The pin holes 23 are located in the longitudinal centre of the flange section. The holes forming the recesses 8 are introduced in this embodiment only as far as the depth of the groove. As in the first embodiment, there are two rows and they can be produced with the same production device as in the first embodiment, with the difference that the depth of the hole is shallower.

To produce the groove the holes forming the recesses 8 are initially produced.

Then the central part of the groove 9 is milled with a groove milling cutter, the set holes being milled to the halfway point, so semi-circular recesses 8 remain.

The arm 6 is held inside the groove 9 by means of grub screws 22 which are screwed into the groove wall and engage with their tips in depressions 21 of the arm 6.

Fig. 8 shows a connecting bridge 5 which is longer than the connecting bridge illustrated in Fig. 4 and 5. In the region of its web 5 it has fastening openings 11 through which screws can be screwed to connect the connecting bridge 4 to short extension pieces. The associated lock cylinders are approximately the same length as those in Fig. 1 to 7.

Fig. 10 and 11 show a cylinder lock with two lock cylinders, both lock cylinders 1,2 being approximately the same length. An extension piece 12 is located between lock cylinder 2 and closing element 3. This extension piece 12 is screwed to the connecting bridge by means of a fastening screw 14. The end face of the flange region of the lock cylinder 2 pointing towards the closing element 3 has a recess. An end face recess of the connecting piece 12 is located opposite this recess. An adjustment element 17 is located in the two recesses and ensures that the lock cylinder 2 is connected non-rotatably to the extension piece 12.

The connecting bridge 4 in this embodiment has a plurality of components. A first component forms the arm 6 and web 5 associated with the lock cylinder 1. A second component forms the arm 6 associated with the lock cylinder 2. This arm 6 forms a trunnion 15 which is inserted in an end opening 16 of the component forming the web 5. A fastening screw 14 which has a dual function projects through a transverse opening of the opening wall of the end opening 16, which latter aligns with a cross hole of the trunnion 15. The fastening screw 14 connects the two components of the connecting bridge 4 on the one hand and secures the extension piece 12 to the connecting bridge 4.

An embodiment of a component of a connecting bridge 4 is illustrated in Fig. 12 and 13. This component forms the web 5 with sleeve screw/threaded hole 10 and a cross hole 18 and a fastening opening 11. An end opening 16 is located on the side of the web 5 remote from the arm 6, which end opening is crossed by the cross hole 18.

The trunnion 15 of the embodiment illustrated in Fig. 16 and 17 can, for example, be inserted in the end opening 16. Here the trunnion 15, which also has a cross hole 20, emanates from a flange 19 from which the arm 6 projects on the other side. Fig. 18 shows a component which is formed by the web 5 only. This component has an end opening 16 at its two end faces in each case into which trunnions 15 of components as illustrated, for example, in Fig. 16 and 17, can be inserted. Fig. 19 to 21 show an intermediate piece. This intermediate piece 13 serves to extend a connecting bridge formed from a plurality of components. On the one hand it has an end opening 16 for insertion of a trunnion 15, on the other hand it has a trunnion 15 which can be inserted in an end opening 16 of another component.

In the component illustrated in Fig. 22 and 23 an arm 6 is connected to the web on the one side and a trunnion 15 as a rivet bolt for the end plate as a semi-cylinder on the other side.

All disclosed features are essential to the invention (per se). In the disclosure of the application, the disclosure content of associated/attached priority documents (copy of the previous application) is also completely included, in addition for the purpose of incorporating features of these documents in the claims of the present application.