EP0606878B1 - Escutcheon plate for a cylinder lock - Google Patents

Abstract

The invention relates to an escutcheon which is intended for a cylinder lock and is intended to protect against break-ins. The escutcheon contains a bottom part, formed conically on the outer circumference (11), and a covering cap which can be positioned on said bottom part and has a border portion (5, 25) which is integrally formed on its rear side and encloses the bottom part. The bottom part and the covering cap exhibit mutually alignable through-passages for the cylinder lock as well as undercuts which can be latched with one another and are intended for mutual connection. According to the invention, the bottom part (9) contains at least one cutout (12) which borders on its through-passage and forms an undercut in the form of a step (14), whereas the covering cap (1) contains at least one undercut in the form of a lug (7) which is intended for latching behind the step (14) and is formed on a tongue (6) which projects inwards from the rear side of the covering cap (1) and borders on the inner contour of the through-passage (3) of said covering cap. <IMAGE>

Description

The invention relates to a rosette of the type specified in the preamble of claim 1.

Known rosettes of this type (DE-C-426 263) are not sufficiently burglar-proof. Rather, it is possible, after the forcibly pulling off the cover cap to detach the lower part from the door and / or to grip or turn the locking cylinder with pliers or the like until it breaks out of its anchoring, in order to attempt to open the door locked with it without authorization. In addition, the opening of the door receiving the locking cylinder must be provided with an extension to accommodate the lugs and tongue parts projecting above the rosette where the rosette is mounted. The additional work to be carried out at the construction site for this purpose is fundamentally undesirable.

The problem of burglar protection can largely be solved by providing a one-piece rosette made of hardened steel that is conical overall on the circumference. In a known proposal of this type (US-A-1 479 657), however, a locking cylinder is required for this, which is secured from the rear of the door by means of a screw projecting through it and at its end assigned to the rosette with a screw between it and the door clamping flange section is provided. Lock cylinders of this type do not meet today's requirements and are therefore undesirable. In addition, even when using this rosette, the opening of the door receiving the locking cylinder must be provided with at least one radial extension for receiving an attachment which is attached to the rear of the rosette and serves to prevent rotation. Finally, this rosette does not have a cover cap that meets the aesthetic requirements.

A rosette serving to protect against burglary is therefore already known, in which a lower part, preferably made of steel, passes through from the inside of the door screwed or at least covered screws is held. This lower part has such a thickness that the locking cylinder in the assembled state only protrudes beyond the lower part to such an extent that its end is essentially flush with its surface after a cover cap has been placed on it. This ensures on the one hand that the locking cylinder has no starting points for a tool. On the other hand, it is also practically impossible to loosen the lower part because, because of its conical outer circumference, it does not have sufficiently large areas that could be gripped with pliers or the like in order to rotate or otherwise loosen the lower part.

A disadvantage of this rosette, however, is that the conical lower part does not offer the possibility of putting on and fastening the top cap, provided the known fastening means such as undercuts for snap connections, threaded parts for screw closures or the like are used. The attachment of such fasteners on the peripheral edges of the lower parts would namely have the result that the desired smooth and conical surface must be at least partially interrupted. This would in turn offer the possibility of attaching a tool after a possibly violent removal of the cover cap, which should be avoided. Therefore, it has hitherto been necessary either to provide no cover cap at all or to attach the cover cap to the lower part by gluing, which is undesirable because of the inseparable connection formed thereby. However, adhesive connections are also undesirable because at least the cover cap is often made of plastic, in particular nylon, and no sufficiently durable steel / nylon adhesive is available. Apart from this, the cover caps would have to be given a shape which is specially adapted to the conical outer circumference of the lower part, which is unsatisfied for formal reasons or is associated with high costs.

In contrast, the invention has for its object to design the rosette of the type mentioned in such a way that it enables effective burglary protection, which makes loosening or loosening of the lower part impossible even after a violent removal of the cover cap.

The characteristic features of claim 1 serve to solve this problem.

The invention has the advantage that the tongue attached to the cover cap is arranged in the assembled state of the rosette and the locking cylinder on the edge of the opening in both the lower part and the cover cap. This keeps her nose firmly engaged with the step of the base by the lock cylinder. Even with a violent removal of the cover cap, which can be designed on the outside as usual, it should hardly be possible to manipulate the tongue part protruding into the opening. But even if this were possible, the narrow gap which is thereby freed between the lower part and the locking cylinder would not be a suitable means of attaching a conventional tool, so that there is a high degree of security against burglary. Finally, it is advantageous that no subsequent work or changes to the doors and / or locking cylinders normally used need to be made.

Further advantageous features of the invention emerge from the subclaims.

• Fig. 1 die Unteransicht einer erfindungsgemäßen Abdeckkappe;
• Fig. 2 einen Schnitt längs der Linie II-II der Fig. 1;
• Fig. 3 einen der Fig. 2 entsprechenden Schnitt durch eine erfindungsgemäße Rosette, die aus einem Unterteil und der Abdeckkappe nach Fig. 1 und 2 zusammengesetzt ist;
• Fig. 4 die Unteransicht einer erfindungsgemäßen Abdeckkappe gemäß einer zweiten Ausführungsform;
• Fig. 5 einen Schnitt längs der Linie V-V der Fig. 4;
• Fig. 6 eine Unteransicht eines erfindungsgemaßen Unterteils für die Abdeckkappe nach Fig. 4 und 5; und
• Fig. 7 einen der Fig. 5 entsprechenden Schnitt durch eine erfindungsgemäße Rosette, die aus dem Unterteil nach Fig. 6 und der Abdeckkappe nach Fig. 4 und 5 zusammengesetzt ist.

The invention is explained in more detail below in connection with the accompanying drawing using exemplary embodiments. Show it:

• 1 shows the bottom view of a cover cap according to the invention;
• Fig. 2 is a section along the line II-II of Fig. 1;
• 3 shows a section corresponding to FIG. 2 through a rosette according to the invention, which is composed of a lower part and the cover cap according to FIGS. 1 and 2;
• 4 shows the bottom view of a cover cap according to the invention in accordance with a second embodiment;
• 5 shows a section along the line VV of FIG. 4.
• 6 shows a bottom view of a lower part according to the invention for the cover cap according to FIGS. 4 and 5; and
• FIG. 7 shows a section corresponding to FIG. 5 through a rosette according to the invention, which is composed of the lower part according to FIG. 6 and the cover cap according to FIGS. 4 and 5.

1 and 2, a cover cap 1 of the rosette according to the invention contains an essentially plane-parallel, for example circular disk 2, which is provided in its central part with an opening 3 for a profile lock cylinder 4 indicated by a broken line in FIG protruding, peripheral edge portion 5. In addition, at least one tongue 6 is formed on the back of the disc 2, which, like the edge section 5, projects vertically backwards and at its free end with an undercut, essentially radially outwards directed nose 7 is provided. A plurality of such tongues 6 are preferably provided and arranged distributed around the circumference of the opening 3. In the exemplary embodiment (FIG. 1) there are four tongues 6. As shown in FIG. 2 in particular, all the tongues 6 directly adjoin the inner contour of the opening 3, so that they extend in the rearward direction like a collar.

The cap 1 is preferably made of an injection molded plastic, especially nylon part.

A lower part 9 of the rosette according to the invention is only shown in section in FIG. 3. It essentially consists of a plane-parallel disk 10, which is preferably made of metal, in particular steel, and is conical on the outer circumference 11. In a central section, the lower part 9 has an opening for the profile locking cylinder 4 (FIG. 3), which has the same size and inner contour as the opening 3 of the cover cap 1 and, in the assembled state, runs coaxially with it.

In the lower part 9, where one of the tongues 6 comes to rest in the assembled state of the rosette, a recess 12 reaching to the edge of the opening is provided. In the exemplary embodiment there are therefore four such cutouts 12. Alternatively, it would be possible to design at least one of the recesses 12 so that it can accommodate several of the tongues 6.

Each recess is so large in its upper region, which borders on the front or top of the lower part 9 facing the cover cap 1, that it can just accommodate the associated tongue 6 in the assembled state. In contrast, each recess 12 in the rear area, which borders the rear or underside of the lower part 9 facing the mounting surface, is provided with a radially outwardly directed step 14, which forms a transition to a widened part of the recess 12. This stage 14 is mounted at such a height that it is in the assembled state of the rosette shown in FIG. 3, backlash-free as far behind as possible at least from the nose 7 of a tongue 6 projecting into the recess 12 and therefore the cover cap 1 in the axial direction Lower part 9 defines. The arrangement is preferably such that, in the assembled state, the edge section 5 of the cover cap 1 and the one with the largest diameter The underside of the conical lower part 9 rests on the respective mounting surface, for example a door leaf, the underside of the pane 2 rests on the upper side of the pane 10 and the edge section 5 borders closely on the underside of the outer circumference 11.

The rosette is assembled by first attaching the lower part 9 to the mounting surface, e.g. fastening screws introduced from the rear of a door are screwed into threaded bores (not shown) bordering on the underside of the lower part 9. 3, the cover cap 1 is pressed onto the lower part 9, the tongues 7 engaging behind the steps 14. Finally, the profile locking cylinder 4 is introduced, the outer contour of which corresponds exactly to the inner contour of the opening 3. As a result, in the assembled state, the lateral surface of the profile locking cylinder 4 lies tightly against the wall sections of the tongues 6 adjoining the opening 3, as a result of which they are prevented from evading laterally. The connections formed by the lugs 7 and steps 14 are therefore locked as long as the profile locking cylinder 4 is mounted. After disassembling the connection, on the other hand, it can be easily detached again, since the lugs 7 can now deflect or be bent away laterally onto the covering cap 1 when a tilting movement is carried out.

Because of the locking effect caused by the profile locking cylinder, the loosening of the connection can be facilitated in that the tongues 6 are elastically easily bendable or designed so that at least the lugs 7 protrude into the area of the opening in the non-assembled state. Pulling the profile locking cylinder out of the opening 3 would therefore result in the connection being released automatically. Alternatively, the lugs 7 could be provided at their upper ends with demolding bevels which facilitate the release of the cover cap 1.

In the embodiment according to FIGS. 4 to 7, a cover cap 21 is provided, which essentially corresponds to the cover cap 1 and a circular disc 22, an opening 23 for a cylindrical cylinder 24 here (FIG. 7), an edge section 25, tongues 26 and Noses 27 has. Except for the differences that, compared to FIGS. 1 and 2, the opening 23 has a circular cross section which corresponds exactly to the cross section of the locking cylinder 24 and only two instead of four tongues 26 are provided, the cap 21 differs from the cap 1 in that the height of the tongues 26 is substantially equal to the height of the edge portion 25.

A lower part 29 (FIG. 6) of the rosette is in two parts compared to FIGS. 1 and 2 and is composed of a fastening part 30 and a cover part 31. The fastening part 30 has bores, not shown, for fastening screws which are screwed in from the mounting side of the door or the like, and two straight, parallel, laterally projecting guide webs 32 which are at a certain distance from the underside which lies on the door are arranged. The cover part 31 is conical on its outer circumference analogous to the lower part 9 according to FIG. 3 and is provided on its underside with a recess corresponding to the shape of the fastening part 30 and with two guide grooves 33 aligned with the guide webs 32 and adapted to them. As a result, after the fastening part 30 has been mounted on a door leaf or the like, the cover part 31 can be pushed onto the fastening part 30 in a direction parallel to the door leaf or the like by means of the guide webs 32 and guide grooves 33, which preferably form a dovetail guide ( Fig. 7). At the same time, however, the guides 32, 33 prevent the cover part 31 from being moved perpendicular to it or perpendicular to the door leaf or the like after being pushed onto the fastening part 30.

The fastening part 30 and the cover part 31 each have an opening 34 which essentially corresponds to the outer contour of the locking cylinder 24 and the opening 23 of the cover cap 21. In addition, both the fastening part 30 and the cover part 31 are provided with cutouts 35 which adjoin the openings 34 and which essentially correspond to the cutouts 12 according to FIG. 3. The recess 35 of the fastening part 30 is provided in the immediate vicinity of its underside with a step 36 which is formed by an obliquely outward cross-sectional widening 37 of the recess 35. Alternatively, it would be possible to provide such a step in the cover part 31 or in the interface between the two parts 30 and 31, simply by making the cross section of the recess 35 of the fastening part somewhat larger than that of the recess 35 of the cover part 31. The arrangement is analogous to FIGS. 1 and 2 so that the recesses 35 have a size substantially corresponding to the size of the tongues 26 and the steps 36 are arranged such that they engage behind the tabs 27 in the assembled state of the rosette will. In addition, the recesses 35 are of course designed and arranged like the openings 34 so that they are aligned with one another in the assembled state.

The rosette according to FIGS. 4 to 7 is assembled by first fastening the fastening part 30 to the door leaf or the like. Then the cover part 31 is pushed on, the cover cap 21 is pressed on and the locking cylinder 24 is inserted into the openings 23 and 34. This has the consequence that on the one hand the lugs 27 are fixed in the recesses 35 and on the other hand a relative displacement of the cover part 31 on the fastening part 30 parallel to the mounting surface is impossible. Therefore, even if the cover 21 should be removed by force, the screw heads remain covered by the cover 31. Unauthorized dismantling is not readily possible since the cover part 31 cannot be lifted axially from the fastening part 30 because of the guides 32, 33.

The rosette according to the invention, as shown in FIGS. 1 to 7, has the particular advantage that the lower part 9, 29 can be designed in such a way as is necessary to avoid unauthorized dismantling of the rosette, while the cover cap is so independent can be designed as desired for the overall aesthetic impression of the rosette.

The invention is not restricted to the exemplary embodiments described, which can be modified in many ways. This applies on the one hand with regard to the cover cap, which like the lower part can also have a shape other than the circular outer shape, in particular, for example, an oval or flat oval shape. In addition, the cover cap can be provided with differently shaped tongues and noses. It is of course possible to provide a single tongue in the form of a collar encircling the circumferential direction of the openings 3,23 and to provide this with a plurality of tabs or even with a single encircling tab provided the material properties require the desired assembly and / or Allow disassembly of such a rosette. On the other hand, the lower parts 9, 29 only represent exemplary embodiments. Furthermore, it goes without saying that the parts described can also be combined in a manner other than that shown in the context of the invention, for example by the rosette according to FIGS. 1 and 2 with the openings according to FIG 4 to 7 and vice versa the rosette according to FIGS. 4 to 7 with the opening according to FIG. 1 and 2 is provided. Finally, it is clear that the outer circumference of the lower part 9, 29 in the case of a shape deviating from the circular shape, although not conical, can nevertheless be chamfered accordingly.

Claims (6)

1. Escutcheon plate for a closing cylinder (4,24) with a lower portion (9,29) and a cap (1,21) which can be placed thereon and which has a rim section (5,25) formed on its rear side, surrounding the lower portion, the lower portion (9,29) and the cap (1,21) having openings (3,23,34) for the closing cylinder (4,24) which can be aligned with one another, and undercuts which can lock into one another and are intended to provide an interconnection, the lower portion (9,29) containing at least one recess (12,35) adjoining its opening and forming a first undercut and the cap (1,21) containing at least a second undercut in the form of a catch (7, 27) intended to catch behind the first undercut and formed on a tongue (6,26) projecting inwards from the rear side of the cap (1,21) and adjoining the inner contour of its opening (3,23), characterised in that the lower portion (9,29) is designed to be conical or chamfered on its outer circumference and the first undercut is designed as a step (14,36) which widens the recess (12,35) in its back region.
2. Escutcheon plate according to claim 1, characterised in that the lower portion (9,29) and the cap (1,21) are provided with a plurality of corresponding undercuts distributed over the circumference of the openings (3,23,34).
3. Escutcheon plate according to claim 1 or 2, characterised in that the tongue (6,26) is designed to be resiliently spring-mounted.
4. Escutcheon plate according to one of claims 1 to 3, characterised in that the recess (12,35) is produced by milling.
5. Escutcheon plate according to one of claims 1 to 3, characterised in that the lower portion (9,29) consists of a cast part.
6. Escutcheon plate according to one of claims 1 to 5, characterised in that the cap (1,21) consists of an essentially plane-parallel disc (2,22) having the opening (23) and from the rear side of which the peripheral edge (5,25) and the tongue (6,26) stand vertically at a distance.

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