DE29823510U1 - Rosette for a door fitting - Google Patents

Description

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JLiU J. Xi European Patent* and Trademark Attorneys

STUTTGART

Dr.-Ing. Dipl.-Phys. Eckhard Wolf* Dr. rer. nat. Dipl.-Phys. Johannes Lutz* Dr. rer. nat. Dipl.-Phys. Thomas Pfiz*

BADEN-BADEN

Dr. rer. nat. Dipl.-Phys. Thilo Cores

Delivery address: Hauptmannsreute D-70193 Stuttgart

Telephone 0711 - 187760 Fax 0711 - 187765

Kärcher GmbH & Co.

Raiffeisenstrasse 32

906 Bad Rappenau

Rosette for a door fitting

Office Baden-Baden: Zeppelinstraße 40 · D-76530 Baden-Baden · Telephone 07221-38520 · Fax 07221-38525

Rosette for a door fitting Description

The invention relates to a rosette for a door fitting with a base body having a central opening for supporting a door handle or for covering a door lock.

Such rosettes are usually attached to a door in pairs, with the base bodies in the intended position placed opposite each other directly on the wide side surfaces of the door and connected using through-bolts. The door holes are arranged at a horizontal distance from each other, and the base bodies have corresponding eccentric screw holes. In order to cover the screws on the visible side, a cover cap is screwed or snapped onto the base body. With these two-part rosettes, however, installation is made more difficult by the fact that a door handle mounted in the base body has to be pressed down against the force of its holding spring in order to expose the screw hole that is hidden in the horizontal handle position.

In addition, the ring edge of the base body should not exceed a specified width for aesthetic reasons, so that the maximum screw diameter is limited accordingly. However, with thin stud screws, the tolerances for the door

holes smaller, so that incorrect drilling often occurs or the base body, which is fixed in the door wood with too much play, damages the support surface. Finally, for repair purposes or to replace door fittings, in particular a handle or a locking cylinder, the entire rosette must be removed from the door.

Based on this, the invention is based on the object of improving rosettes of the type mentioned at the outset in such a way that assembly is made easier, replacement of fitting elements is simplified and an improvement in the design is made possible while ensuring reliable fastening.

To solve this problem, the combination of features specified in claim 1 is proposed. Advantageous embodiments and developments of the invention emerge from the dependent claims.

The essence of the invention is to provide a base part that can be easily pre-assembled in the intended position, via which the base body can be indirectly secured to the door. In order to make this possible, the invention proposes a disc-shaped mounting base that can be anchored to the door, with which the base body can be brought into engagement with a contact surface and firmly connected via connecting means. This makes it possible to

The necessary fastening elements can be designed and installed independently of the structure of the base body, so that subsequent removal of the base body is also simplified.
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In order to enable pre-assembly in the desired position without affecting the rosette function, the mounting base, designed as a ring disk, advantageously has a central opening for an actuating element of the door fitting, which is arranged coaxially with the opening of the base body when mounted, and several, preferably two, eccentrically axially continuous mounting holes, distributed in the circumferential direction, for receiving mounting screws. The hole diameters can be selected to be so large that incorrect assembly is largely ruled out.

The installation of a pair of rosettes is made easier by the fact that the mounting base can be anchored to the door in a predetermined position with another mounting base arranged on the wide side of the door using two fastening screws that pass through the fastening holes and the door. The mounting base advantageously has two diametrically opposed fastening holes, one of which is provided with an internal thread to accommodate the screw shaft of a first fastening screw and the other for storing the preferred

The screw head of a second fastening screw is designed as a countersunk head.

Especially for covering profile cylinder and warded locks, it is advantageous if the central opening of the mounting base has an elliptical outline and if the fastening holes are arranged to the side of the central opening on its small elliptical axis.

From a manufacturing point of view, it is advantageous if the mounting base is designed as a die-cast part made of aluminum or an aluminum alloy.

According to a further advantageous embodiment of the invention, the mounting base has at least one support cam protruding from its support side facing the door and which can be inserted into a hole in the door in a form-fitting manner for position-defined pre-assembly. Here, it is particularly advantageous if the mounting base has two diametrically opposed support cams, each of which is axially penetrated by a fastening hole.

In order to be able to place the base body in a defined manner on the mounting base and to secure it against twisting, the mounting base advantageously has at least one axially protruding flange on its flange side facing the base body, which in the fastening state can be turned into a corresponding

The base body has a centering pin that engages in a form-fitting manner in the centering opening of the base body as a connecting means. To prevent axial displacement, a screw-on ring that can be screwed onto the mounting base can be provided as a connecting means, whereby the screw-on ring engages over the base body at its visible edge and presses against the mounting base. This means that axial removal of a door handle can be safely prevented even with high actuation forces. In order to delimit an interior space, in particular for storing a handle neck, the base body can have a ring part that can be placed on the mounting base with a flat front contact surface and an end wall that covers the clear cross-section of the ring part on the visible side while keeping the central passage opening free. Different functions can be implemented with only minor structural changes by designing the opening that breaks through the front wall of the base body either as a bearing hole for the door handle or as a profile cylinder or deadbolt hole for the door lock.

In terms of both functionality and design, it is advantageous if the front wall of the base body protrudes axially over the ring part in a stepped manner and the screw-on ring has a front-side ring strip that is flush with the front wall and rests against the ring part on the visible side.

An attractive design can be achieved by having at least the visible surfaces of the base body and the screw ring differ in color or surface structure. 5

The invention also includes a door fitting with two rosettes according to the invention arranged opposite one another as a pair of rosettes on both sides of the door.
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The invention is explained in more detail below using an embodiment shown schematically in the drawing.

Fig. la and b show a disc-shaped mounting base of a rosette for a door fitting in a front side and narrow side view;

Fig. 2a and b show a basic body of the rosette in a representation corresponding to Fig. 1;

Fig. 3a and b a screw ring of the rosette in a representation corresponding to Fig. 1; and

Fig. 4 shows a pair of rosettes mounted on both sides of a broken-off door leaf in an axial vertical section.

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The round rosette for a door fitting shown in the drawing essentially consists of a disc-shaped mounting base 10, a generally ring-shaped base body 12 and a screw-on ring 14. 5

The mounting base 10, which is basically designed as a ring disk, has a central opening 16 that is elliptical in outline and two axially continuous fastening holes 18, 20 that are arranged diametrically opposite one another to the side of the central opening 16 on its small elliptical axis. The first fastening hole 18 is provided with an internal thread 22, while the smooth, continuous second fastening hole 20 on the flange side 24 of the mounting base 10 has a chamfer 26 for receiving the head of a countersunk screw. With a diameter of the mounting ring of approximately 50 mm, the diameter of the cross holes is expediently at least 3 mm, preferably 4 mm. Two additional holes 28 are provided at an angular distance from the fastening holes 18, 20 for auxiliary fastening.

On the support side 30 facing the door in the assembled state, the mounting base has two eccentrically axially protruding support cams 32, 33 penetrated by the fastening holes 18, 20, while on the opposite flange side 24 of the mounting base 10 two axially protruding centering pins 34 arranged at an angle of 90° to the support cams 32 are formed.

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The mounting base 10 has an external thread 36 on the casing side. The mounting base 10 is expediently made as a die-cast aluminum part.

The base body 12 has a ring part 38 and a visible end wall 40 that protrudes axially in a stepped manner from the ring part 38. The ring part 38 is provided with two diametrically opposed, axially continuous centering openings 42, while the end wall 40 has a central opening 44. The outer diameter of the ring part 38 is slightly smaller than that of the mounting base 10.

The screw-on ring 14 has a casing part 48 that can be screwed onto the mounting base 10 with an internal thread 46 and an annular strip 50 that projects radially inward from the casing part, the clear internal diameter of the annular strip 50 corresponding to the external diameter of the end wall 40 of the base body 12. 20

The following describes the two-sided door mounting of a pair of rosettes 52, which are intended for mounting the door handles 54, using Fig. 4. In a first assembly step, the mounting bases 10 are first placed with their support side 24 on both sides of the door leaf 56, with the support cams 32, 33 engaging in a form-fitting manner in corresponding holes in the door leaf 56. Two fastening screws are then used to connect the mounting bases 10 to one another.

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58 are inserted from the opposite sides of the door leaf with their threaded shaft 60 into the fastening holes 20 and screwed into the internal thread 22 of the aligned fastening hole 18 of the opposite mounting base 10 until the screw head 62 is supported in the chamfer 26 of the fastening hole 20. In this way, the mounting bases 10 are clamped against the door leaf 56, while the support cams 32, 33 ensure a defined mounting position. In a next assembly step, the base body 12 equipped with the door handle 54 is placed with its contact surface 64 formed by the free front end of the ring part 38 onto the flange side 24 of the associated mounting base 10 in such a way that its centering pins 34 engage in the centering openings 42 in a rotationally secured manner. To prevent the base body 12 from moving axially, in a next assembly step the screw ring 40 can be guided over the handle part 66 of the door handle 54 and screwed onto the external thread 36 of the mounting base with its internal thread 46. In the connection state thus created, the ring strip 50 of the screw ring 14 is flush with the front wall 40 of the base body 12. For design reasons, it can be provided that the base body 12 and the screw ring 14 have different colors or surface structures from one another.

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The central opening 44 of the front wall 40 of the base body 12 serves as a bearing for the handle neck 68 of the door handle 54. A reset mechanism arranged in the interior 68 delimited by the components 10, 12, 14 of the rosette ensures that the handle part 66 is held up and at the same time secures it against axial removal. For this purpose, the reset mechanism has a spiral spring 72 pre-tensioned between an inner pin 70 of the base body 14 and the handle neck 68, via which a locking disk 76 fixed to the handle neck 68 by means of a spring ring is supported on the inside of the front wall 40 of the base body 14. The inner pin 70 engages in a radially cut-out segment 78 of the locking disk 76, which defines the rotation range of the handle part 66. To operate the lock latch, the door handle 54 is connected via a polygonal mandrel 82 secured by a grub screw 80 to another door handle (not shown) mounted in the opposite rosette 52. In the arrangement described above, the rosettes 52 can also be used to cover the front of a door lock, with the central opening 44 then being designed as a profile cylinder or warded hole.

In summary, the following can be stated: The invention relates to a rosette for a door fitting with a base body 12 having a central opening 44 for supporting a door handle 54 or

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to cover a door lock. To simplify assembly, a disk-shaped mounting base 10 is provided that can be anchored to the door 56, with which the base body 12 can be brought into engagement on a contact surface 64 and can be firmly connected via connecting means 34, 14.

Claims (14)

- 12 - Protection claims 1. Rosette for a door fitting of a door (56) with a base body (12) having a central passage opening (44) for supporting a door handle (54) or for covering a door lock, characterized by a disc-shaped mounting base (10) which can be anchored to the door (56), with which the base body (12) can be brought into engagement on a contact surface (64) and can be firmly connected via connecting means (34, 14). 2. Rosette according to claim 1, characterized in that the mounting base (10) designed as an annular disk has a central opening (16) arranged coaxially with the passage opening (44) of the base body (12) in the fastening state for an actuating element (82) of the door fitting and several, preferably two, eccentrically axially continuous fastening holes (18, 20) arranged distributed in the circumferential direction for receiving fastening screws (58). 3. Rosette according to claim 2, characterized in that the mounting base (10) is connected to a (56) another mounting base arranged opposite each other on the broad side via two fastening holes (18,20) and the door (56) protruding through - 13 - fastening screws (58) together to the door (56). 4. Rosette according to one of claims 1 to 3, characterized in that the mounting base (10) has two diametrically opposed fastening bores (18, 20), one of which is provided with an internal thread (22) for receiving the screw shaft (60) of a fastening screw (58) and the other is designed to support the screw head (62), preferably designed as a countersunk head, of a further fastening screw (58). 5. Rosette according to one of claims 2 to 4, characterized in that the central opening (16) of the mounting base (10) has an elliptical outline, and that the fastening holes (18, 20) are arranged laterally of the central opening (16) on its small elliptical axis. 6. Rosette according to one of claims 1 to 5, characterized in that the mounting base (10) is designed as a die-cast part made of aluminum or an aluminum alloy. 7. Rosette according to one of claims 1 to 6, characterized in that the mounting base (10) has at least - 14 - at least one support cam (32,33) protruding on its support side (30) facing the door (56) and insertable in a form-fitting manner into a bore in the door (56).
5 8. Rosette according to claim 7, characterized in that the mounting base (10) has two diametrically opposed support cams (32, 33), each axially penetrated by a fastening bore (18, 20). 9. Rosette according to one of claims 1 to 8, characterized in that the mounting base (10) has at least one centering pin (34) as a connecting means, which projects axially on its flange side (24) facing the base body (12) and, in the connected state, engages in a form-fitting manner in an associated centering opening (42) of the base body (12). 10. Rosette according to one of claims 1 to 9, characterized in that a screw-on ring (14) which can be screwed onto the mounting base (10) is provided as a connecting means, wherein the screw-on ring (14) engages over the base body (12) at its visible edge and presses axially against the mounting base (10) in a manner which prevents it from being displaced. - 15 - 11. Rosette according to one of claims 1 to 10, characterized in that the base body (12) has a ring part (38) which can be placed on the mounting base (10) with a flat front contact surface (64) and an end wall (40) which covers the clear cross section of the ring part (38) on the visible side while keeping the central passage opening (44) free. 12. Rosette according to one of claims 1 to 11, characterized in that the passage opening (44) breaking through the end wall (40) of the base body (12) is designed as a bearing bore for the door handle (54) or as a profile cylinder or warded hole of the door lock. 13. Rosette according to claim 11 or 12, characterized in that the end wall (40) of the base body (12) projects axially beyond the ring part (38) in a stepped manner, and that the screw-on ring (14) has an end-side ring strip (50) which bears against the ring part (38) on the visible side and adjoins the end wall (40) flush with the surface. 14. Door fitting, characterized by two rosettes (52) according to one of the preceding claims arranged as a pair of rosettes on both sides of the door (56) opposite one another.