Door fitting

Abstract

The present invention relates to a door fitting for a door with a door leaf, in particular for an interior door, comprising two manually operable actuating handles arranged on opposite sides of the door leaf, preferably substantially mirror-symmetrically to the door leaf, and designed as an interior and exterior door handle. The exterior door handle can be locked and unlocked by rotating and / or longitudinally displacing the interior door handle.

Description

Subject of the invention

[0001] The present invention relates to a door fitting for a door with a door leaf, in particular for an interior door, comprising two manually operable actuating handles which are arranged on opposite sides of the door leaf, preferably substantially mirror-symmetrically to the door leaf, and are designed as an interior and exterior door handle. State of the art and its disadvantages

[0002] For decades, a pair of door handles arranged symmetrically on the so-called – usually wooden – door leaf has been established for operating interior doors from both sides. Both door handles – also colloquially referred to as doorknobs or door handles, and usually mechanically rotating levers with one arm, but can also be axially symmetrical or oval doorknobs, sometimes offset from the rotation axis – are attached to the door leaf via round or elongated mounting plates. The former are called handle rosettes, the latter are called escutcheons. These have openings for the handle (handle hole) and key (keyhole). Separate rosettes for keys are called key rosettes, and the entire assembly is called a door fitting.

[0003] The purpose of the door fitting is, on the one hand, to rotate the door leaf around its hinge axis and, on the other hand, to rotate the door handle around its axis of rotation to retract a spring-loaded latch, which is pulled out of the strike plate of the door frame. This allows the door to be opened when the door handle is pressed down. The "soft" compression or leg spring that constantly applies pressure to the latch is called the latch spring.

[0004] The latch in the box-shaped door lock is driven by a finger of a lock follower that rotates around the handle's axis of rotation, retracting the (snap) latch when the handle is operated. The lock follower has a – usually square – cutout in its axis of rotation, through which a (square) pin of the same cross-section extends, both ends of which engage with the equally square blind holes in the door handle pair. This pin is held in its horizontal starting position by a "hard" so-called lock spring, which engages the circumference of the lock follower. For this purpose, the lock follower usually has a rotation stop located in the lock case that opposes the direction of rotation of the handle pair. In practical terms: The "levers" can usually only be pushed downwards and cannot be rotated upwards beyond their horizontal starting position!

[0005] The lock follower is provided with mirror-symmetrical circular cylindrical shoulders on both sides, arranged coaxially to the follower axis and pivoted in corresponding holes in the two so-called lock covers of the usually box-shaped door lock. The pivot bearing of the lock follower in the lock case is mechanically a so-called (mirror-symmetrical) support bearing.

[0006] In addition to the latch, which is provided with a bevel on the front so that the door can "fall into the lock" unhindered - and with free play relative to the driver finger of the lock nut - a common door lock has a lock bolt which - in order to lock the door - can be extended and retracted by turning the door key and engages and disengages with the corresponding opening in the strike plate.

[0007] Historically, door locks were designed as so-called rim locks, which were mounted on the door leaf. Therefore, they are also known as "surface locks," which can still be found today, for example, on furniture doors, cellar doors, and shed doors. In contrast, standard interior doors with leaf thicknesses of approximately 40 mm are equipped with so-called mortise locks according to DIN 18 251, which are sandwiched into the door leaf. For this purpose, the so-called door faceplate is provided with a milled lock pocket. The "front plate" of the door lock is called the faceplate and, on wooden doors, is flush with the door faceplate. The distance from the faceplate to the common pivot axis of the handle(s) and lock follower is called the backset. This is usually between 50 and 70 mm.

[0008] For mortise locks for tubular frame doors according to DIN 18 251-2, the backset is approximately half of this. These "narrow" locks are also suitable for use with the subject matter of the invention.

[0009] "Most modern mortise locks function as a change lock." [WIKIPEDIA "Change lock" from July 15, 2022] This design allows the latch to be retracted—in addition to the handle—by turning the key. This opens up a wide range of modular application possibilities in an extremely economical way—the change function requires only a single, additional (punched) part compared to door locks without this feature! For this purpose, the keyhole in the lock cover is conveniently designed as a "profile cylinder hole" (opening for the use of a standard profile cylinder according to DIN 18 252). Here are some application examples: 1. In its basic function, the door fitting merely performs the task of retracting the latch. This is perfectly sufficient for kitchen and living room doors, for example. Even though the standardized mortise lock with latch is mandatory in the door leaf or tubular frame, on-site joiners are increasingly dispensing with the installation of a key for aesthetic and practical reasons: The door is then only equipped with a mirror-symmetrical handle and rosette pair. 2. As a so-called bathroom fitting, the aforementioned door lock is provided with a (plastic) insert in the "profile cylinder" hole with a follower that has a (small) square cutout in its pivot axis. This serves to accommodate a square spindle, which has a rotary knob or a so-called rotary handle on the inside of the room and a slotted head or square head or similar on the outside of the door for emergency release to retract the lock bolt.To lock and unlock the bathroom door, the (plastic) nut uses a finger that is identical in shape to the so-called locking bit of a profile cylinder. The use of the toggle lock offers the significant advantage of retracting the lock latch by turning the emergency release (first the lock bolt and then turning further) if the interior door handle is blocked - e.g., by playing children or an injured person. 3. For lockable residential and commercial premises, the standardized toggle lock is equipped with a pair of handles (above) and a profile cylinder (below), which is conveniently designed as a so-called "knob cylinder": This is equipped with a turning knob on the inside for keyless locking of the door and is accessible from the outside with a door key. This configuration is widely used in commercial construction, for example, on office doors and doors for retirement and nursing homes: During "daytime operation," the door, as described in 1.As described, accessible, can be locked and unlocked from the inside (keyless) during "night operation," and opened from the outside using a key in an emergency. 4. The change lock is ideal for house and entrance doors, as well as apartment doors (corridor doors). In contrast to 3., a fixed knob replaces the rotating exterior handle. If the door is locked via the locking cylinder, upon access from the outside, turning the door key first pulls the lock bolt out of the door frame's strike plate in one or more turns—so-called "turns"—and, with continued key turning, the latch bolt is also pulled out via the change function. (Incidentally, this is the origin of the term "change": The rotation of the key or knob elegantly "changes"—invisibly to the operator—from the deadbolt retraction to the latch retraction.) 5.The modular system described, based on the common interlocking lock, also allows for a digital design facet: For this purpose, the profile cylinder described in points 3 and 4 is equipped with a knob on each side, the outer one of which contains a reading unit for a digital data carrier—e.g., a transponder. As soon as the outside knob recognizes access authorization, the locking cam mentioned in point 2 becomes active when it is turned, thus enabling the deadbolt and latch to retract.

[0010] Historical locks already take into account the basic human need, which is expressed in behavioral biology, to be undisturbed in certain situations: For example, the box locks described in the two documents DE 274 245 A and DE 346 576 A, which are over a hundred years old, use the term "night bolt".

[0011] For modern mortise locks, privacy protection is met by the rotation-locking handle pair according to DE 895 575 B and GB 2 123 070 B. The obvious disadvantage of these locks is that they cannot be released from the outside in an emergency. Door fittings according to DE 10 2007 030 655 A1 and DE 20 2018 006 769 U1 address this with externally accessible, mechanically movable components for emergency release.

[0012] To "hold" the door shut, the last four methods described above rely on the latch retraction, which is prevented by a handle lock. This is mechanically sufficient to meet the security requirements: Protection against forced entry with the required resistance classes using sturdy lock bolts or even so-called espagnolette locks is not necessary.

[0013] All of the cited locking and (emergency) unlocking techniques of the state of the art share the common disadvantage that their operation is overwhelming for both people with limited mobility and those suffering from anxiety and panic. This need was recognized very early on, as described in DE 261 857 A for a box lock: "Especially in the event of a shipping accident, when it is necessary to leave the cabin as quickly as possible, the lock offers the advantage that simply turning the handle immediately opens the lock, thus opening the door."

[0014] The industry addressed this fundamental need with the development of so-called panic locks, which, in conjunction with the associated door fittings, are defined in the DIN EN 179 standard "Emergency Exit Devices...". As the term "panic locks" suggests, complex and therefore expensive special locks—often with a cross-split lock follower—are required to fulfill the "panic function" impressively cited above from DE 261 857 A. These locks ensure that even a locked door can be opened when the interior door handle is pushed down by simultaneously retracting the latch and deadbolt. This is neither the case nor required for the standard lock (with latch mechanism) discussed in sections 1 to 5.

[0015] DE 20 2023 101 565 U1 discloses a door handle fitting comprising a first handle formed as an external handle, a base plate connected thereto with at least one locking element, and a polygon which can be brought into engagement with the base plate and the external handle and has at least one locking pin, wherein the locking pin interacts with the at least one locking element by moving the polygon in the axial direction such that the external handle is blocked for movement in a predetermined radial direction of movement in a first position of the polygon and is released for movement in a predetermined radial direction of movement in a second position of the polygon. Aim of the invention

[0016] The aim of the invention is to overcome the described disadvantages of the prior art and to create a door fitting that is independent of the door lock and therefore allows barrier-free locking and unlocking of the door through ergonomic operation of the interior door handle using common door locks - and thus also as a retrofittable assembly. Brief description of the invention

[0017] This object is achieved according to the invention in the door fitting of the type mentioned at the outset in that the outside door handle can be blocked and unlocked by turning the inside door handle.

[0018] The door fitting according to the invention thus enables both the locking of the outside door handle and the leaving of the room by using only the inside door handle, and still allows emergency unlocking from the outside.

[0019] To prevent the exterior door handle from rotating, the interior door handle is preferably pivoted upwards at an acute angle that is acceptable even for people with limited mobility—e.g., 20°—with the square spindle non-rotating. It then reaches its upper angular end position, either with a locking mechanism or secured by a slip clutch to prevent it from falling back. The resulting rotation lock of the exterior door handle mechanically prevents unauthorized access by third parties.

[0020] To exit the room, the interior door handle can be grasped as usual – due to its acute angle – and moved beyond its horizontal starting position to the lower rotation stop (in the lock), which engages the latch and allows the door to be opened. The door is now accessible from both sides without restriction using the essentially mirror-symmetrical pair of door handles as usual.

[0021] According to the invention, the interior door handle has a freewheel action limited by an acute angle from its horizontal starting position upwards relative to the square spindle and thus also relative to the lock nut and, from its horizontal starting position downwards, takes the square spindle and thus the lock nut with it in the usual function, whereby the lock latch is retracted.

[0022] When the interior door handle is pivoted upwards, the rotation lock of the exterior door handle is visible to the person in the room even from a great distance due to the angled position of the interior door handle.

[0023] This advantage also applies to transparent glass doors: Here, you can see at a glance from the outside whether the exterior door handle is rotatable or fixed.

[0024] What is aesthetically pleasing is that there is no additional handle on the interior door handle to disturb its simple appearance, so that the handle rosette sets without a key rosette, which are becoming increasingly common in residential areas, can be used - not to mention the long overdue banishment of the old-fashioned door plate with keyhole.

[0025] In an emergency, if the interior door handle is raised and the exterior door handle is thus locked, access from the outside is possible by mechanically operating the key in the change lock, thereby retracting the latch. This also applies to electronically operated locking cylinders.

[0026] Instead of the key, the emergency release from the outside can also be carried out using, for example, a polygonal or so-called slotted head arranged on the locking cylinder.

[0027] The modular system also allows the door to be opened (in an emergency) using a standard electric door opener located in the door frame, while only locking the door with a latch.

[0028] Although the subject matter of the invention is predestined for interior doors, it can also be applied to house, entrance, and apartment doors: Firstly, in "night mode," these doors are usually mechanically locked with so-called multi-point locking devices, making them ineffective against burglary. In "day mode," this type of door is unlocked when the occupant is present, and the interior door handle is pivoted upwards according to the invention. Now, the exterior door handle—even in the form of a knob or knob—is non-rotatable, which corresponds to the function of common doorknob sets (with a key lock). In the third mode—which can be described as "party mode," the exterior door, designed, for example, as a patio or side entrance door, can be operated unhindered from both sides when the interior door handle is pushed down. This is extremely convenient, for example, at family celebrations and children's birthday parties.

[0029] In addition to the application of the subject matter of the invention in the immobile living and working world, it can also be used in vehicles for road, rail, air and water: From, for example, bus, train and aircraft toilets to the (above-cited) ship cabin and sleeping areas of mobile homes, a wide field of application opens up in the mobile world.

[0030] Further preferred embodiments of the door fitting according to the invention emerge from the dependent claims.

[0031] The invention further relates to a door fitting according to claim 9, which is explained in more detail in the following detailed description. Detailed description of the invention

[0032] Further features, details and advantages of the invention - which may also be relevant to the invention in combinations not explicitly mentioned - are explained in more detail using the following exemplary embodiments with reference to the drawings.

[0033] They show in detail: Fig. 1: a perspective view of a door fitting as a so-called rosette set with left and right door handles in horizontal starting position and a drive element connecting both door handles - here designed as a square spindle; Fig. 2: how Fig. 1 , but with the interior door handle removed and turned by 180° and with the free end of the handle shown as a handle stub; Fig. 3: as Fig. 2 , but with the interior door handle pushed down by approximately 40° for the purpose of retracting the latch, shown as a handle stub; and Fig. 4: as Fig. 3, but in order to block the rotation of the outside door handle remaining in the horizontal initial position, the inside door handle is pivoted upwards by approximately 20°.

[0034] In Fig. 1 a door fitting designated 1 according to a first embodiment of the invention is shown in the starting position of both door handles, the inside door handle 2 of which can be pivoted upwards from its horizontal starting position at only an acute angle relative to the outside door handle 3 and thereby blocks its downward movement.

[0035] In Fig. 2The interior door handle 2 has been removed, revealing the kinematics for locking and releasing the exterior door handle 3: A stop plate 4 is fixedly attached to the door leaf (not shown) with axially extending fastening cams 5, as can be seen on the opposite handle rosette 6 of the exterior door handle 3 – in technical jargon: "hinged." The stop plate 4 has a pair of two, axially extending, projections 7, which are radially mirror-symmetrical and diametrically opposed, each of which is radially penetrated by a (preferably rectangular) shaft 8, which serves to accommodate locking elements 9 mounted radially in a floating manner. These are designed here as circular-cylindrical discs, but can also be designed as rings, balls, rollers, pins, or similar.

[0036] For manufacturing reasons, the shafts 8 can also be designed as open (U-shaped) gaps aligned axially toward the interior door handle 2. This is particularly advantageous from a manufacturing perspective when the stop plate 4 is designed as a stamped part.

[0037] A handle nut 11 with its corresponding internal square is arranged on a square spindle 10, which is permanently and rigidly connected to the exterior door handle 3. The term handle nut 11 is chosen analogously to the lock nut (not shown), which is also rigidly connected to the square spindle 10 and is located approximately—axially floating—on its axial center and is enclosed by the so-called lock case.

[0038] The grip nut 11 has two diametrically opposed radial recesses 12 for receiving the two locking elements 9. The projections 7 are surrounded on their outer circumference by a link ring 13, which has two inner and point-symmetrical circular segments of different inner diameters for controlling the locking elements 9.

[0039] The cam ring 13 is provided with two diametrically opposed, axially continuous driving bores 14, which are in positive axial engagement with two likewise diametrically opposed driving claws 15 – in the manner of a so-called claw coupling – of the interior door handle 2 in both circumferential directions. Thus, the annular disc-like cam ring 13 can be attached to the driving claws 15 with one side for a right-handed interior door handle 2 and with the other side for a left-handed interior door handle 2. The interior door handle 2, which is thus rotationally rigid with the cam ring 13, is designed such that its door-side end, with a flat, cup-like bell 21, encloses the entire locking assembly and is aesthetically pleasing, essentially identical in shape to the usually circular-cylindrical outer rosette 6.It is not a problem that the inner rosette (bell) 21 rotates as part of the inner door handle 2 during operation and the outer rosette 6 remains stationary relative to the door leaf.

[0040] The force flow of the interior door handle 2 allows for its one-piece design with the aforementioned bell 21. A manufacturing alternative is to manufacture both parts separately and, for torque transmission, to provide the so-called handle collar of the interior door handle 2 with a longitudinal profile that engages a corresponding axial opening of the bell 21 in the common rotation axis 20 of both parts in a rotationally fixed manner. Such designs have proven themselves millions of times in so-called shaft-hub connections ("WNV"). The bell can be provided with a decorative cover cap.

[0041] The interior door handle 2, the stop plate 4, and the handle follower 11 are preferably designed with mirror symmetry and can therefore be used for both operating directions. The cam ring 13 is designed with point symmetry and, as mentioned, only needs to be turned for right- or left-hand operation of the interior door handle 2. Thus, the assembly according to the invention advantageously allows the fitting of both left- and right-hinged doors using the same individual parts that also comprise the exterior door handle 3 and its rosette 6.

[0042] The point-symmetrical link ring 13 has two diametrically opposed and radially facing driving lugs 16, which project into the two corresponding driving gaps 17 on the circumference of the handle nut 11. As Fig. 2As can be seen, in the initial state the corresponding two flanks of the driver lugs 16 rest on the associated flanks of the driver gaps 17, so that the interior door handle 2 drives the handle nut 11 when pressed down from its horizontal initial position and thereby - via square pin 10 and lock nut - brings about the desired latch retraction.

[0043] The interior door handle 2 is provided with a threaded hole 18 in its rotation axis 20, which is designed as a threaded blind hole. A threaded pin 19 of the square spindle 10 is fully screwed into this hole to utilize the positive locking for the torque between the square spindle 10 and the corresponding internal square of the handle nut 11 along its entire axial length.

[0044] The screw connection of the square spindle 10 with its threaded pin 19 in the threaded hole 18 of the interior door handle 2 represents an unconventional and simple axially fixed, rotatable bearing, which – given the generous length of the threaded pin 19 – impresses with its negligible tilting play. Furthermore, this design is suitable as a slip clutch between the internal thread 18 and external thread 19, as a spring-loaded ball is placed in the threaded blind hole, which permanently presses axially against the front side of the threaded pin 19. The slip torque acting between the thread flanks due to the axial spring force (which is quite trivial here compared to a detent torque, which is more complex to achieve) is necessary to prevent the raised interior door handle 2 from falling back into its horizontal starting position under its own weight.Protection is claimed for this design - consisting of only two components when unsprung and only four components when fitted with a ball spring - both as an embodiment of the door fitting according to the invention and independently thereof.

[0045] The technical term for the assembly comprising the interior door handle 2 and the square spindle 10, which is axially screwed into it, is "spin part." Its square (free) end is to be joined axially to the exterior door handle 3, which has a square blind hole, referred to in technical jargon as a "hole part." While there is no shortage of joining techniques for this purpose, a tool-free attachment technique according to EP 1 683 933 B1 has become established in recent years. This meets the subject matter of the invention in that the door fitting 1 clamps the door leaf in a sandwich-like manner and without play simply by axially sliding the two door handles 2 and 3 toward one another. In addition to the user-friendly attachment technique, conventional axial screw connections of the handle rosette(s) are also dispensed with!

[0046] Fig. 3shows the door fitting 1 with the door handle pair 2 and 3 pressed down and thus with the lock latch retracted. The handle rotation is made possible by the fact that the inner flanks of the radial recesses 12 of the handle follower 11 can freely displace the locking elements 9 outward into the larger-diameter circular segments of the guide ring 13.

[0047] When the handle is rotated by actuating the inside door handle 2 (against the latch and lock spring), the angle of which is limited by the rotation stop of the lock nut in the lock case, the handle torque is transferred from the inside door handle 2 to the link ring 13 which is fixed to it in rotation, the two driver lugs 16 of which act on the corresponding flanks of the driver gaps 17 of the handle nut 11 in the direction of rotation.

[0048] Fig. 4shows the kinematic configuration for locking the exterior door handle 3 (downward rotation). For this purpose, the interior door handle 2 is raised at an acute angle (to the horizontally stationary exterior door handle 3) with the square spindle 10 and thus the handle nut 11 also remaining stationary. The angular difference in the circumferential direction between the "small" driver lugs 16 and the "large" driver gaps 17 provides the freewheel required for positive locking: In this angular position, the two radial recesses 12 of the handle nut 11 face each other with the two shafts 8 of the projections 7, whose outer circumferences are now enclosed by the small-diameter circular segments of the link ring 13 and block the radial "exit" of the locking elements 9.When the outside door handle 3 is operated, the side cheeks of the radial bays 12 of the handle nut 11 strike the locking elements 9, which transmit the torque of the outside door handle 3 and thus of the square pin 10 via the projections 7 and the fastening cams 5 of the stop plate 4 to the door leaf (not shown) and thus prevent the rotation of the outside door handle 3.

[0049] When pressing down the acute-angled raised interior door handle 2, both to open the door, with the horizontal handle initial position after Fig. 1 and 2 to achieve the grip position after Fig. 3 is simply "run over", as well as for simply establishing the horizontal handle starting position, the two circular segments of larger inner diameter of the link ring 13 release the radial path of the locking elements 9, so that the handle nut 11 and thus the square pin 10 together with the outside door handle 3 can again rotate unhindered.

[0050] The control of the radial movement of the two diametrically opposed locking elements 9 via the radial bays 12 of the handle nut and the two inner diameters of the link ring 13 is carried out in a form-fitting manner as a so-called positive control without springs, which ensures the absolute functional reliability of the locking mechanism described.

[0051] The force transmission via the pairs of diametrically opposed force transmission points in the locking mechanism prevents any resulting transverse forces from occurring, thus protecting all pivot bearings from wear.

[0052] In another embodiment, not shown graphically, the freewheel of the interior door handle 2 is used to rotate a (square) shaft 92 of the locking device 90 from DE 10 2007 030 655 A1, without the locking elements 9.

[0053] Another embodiment, also not graphically illustrated, involves the use of said freewheel for the longitudinal drive of a "locking means 15" or a "slide element 16" according to DE 20 2018 006 769 U1. The emergency release described in this document, according to claim 7 thereof, requires an expensive shaft element (12) with a weakened cross-section [corresponding to the square pin 10 of the present description]. This suggests, from an inventive perspective, the square pin 10 as a whole to lock and unlock the exterior door handle 3 by being moved in its longitudinal direction by the freewheeling movement of the interior door handle 2 when the latter is lifted. For emergency release, the exterior door handle 3 can be axially penetrated by the square pin 10 and can be pushed back from the outside using a nail-like tool.

[0054] In another embodiment, also not shown graphically, the interior door handle 2 is axially and rotationally fixedly connected to the square spindle 10 and - according to DE 10 2014 103 994 B4 - is rotationally locked by its door rosette or door plate during its longitudinal movement of a few millimeters. This also prevents rotation of the exterior door handle 3, which is also rotationally fixedly arranged on the square spindle 10. By an opposite longitudinal movement of the interior door handle 2 or by, for example, axially pushing back the square spindle 10, which extends longitudinally through the exterior door handle 3 in its rotational axis, the interior door handle 2 is (emergency) unlocked and thus both door handles 2, 3 can be operated.

[0055] All features arising from the claims, the description and the drawings, including design details, arrangements and process sequences, can be relevant to the invention both individually and in a wide variety of combinations. List of reference symbols

[0056] 1 Door fitting 2 Interior door handle 3 Exterior door handle 4 Stop plate 5 Fastening cam 6 Handle rosette (exterior door handle) 7 Projection 8 Shaft 9 Locking element 10 Square spindle 11 Handle nut 12 Radial recess 13 Link ring 14 Driver hole 15 Driver claws 16 Driver nose 17 Driver gap 18 Threaded hole 19 Threaded pin 20 Rotation axis 21 Bell (interior door handle)

Claims

1. Door fitting (1) for a door with a door leaf, in particular for an interior door, comprising two manually operable actuating handles which are arranged on opposite sides of the door leaf, preferably substantially mirror-symmetrically to the door leaf, and are designed as an interior (2) and exterior door handle (3), characterized in that the outside door handle (3) can be locked and unlocked by turning the inside door handle (2).

2. Door fitting (1) according to claim 1, wherein the inner door handle (2) can be rotated upwards from its horizontal starting position into a stable angular end position in order to block the rotation of the outer door handle (3), while the outer door handle (3) remains in its horizontal starting position.

3. Door fitting (1) according to claims 1 and 2, wherein the inner door handle (2) can be rotated upwards into an ergonomically comfortable acute angle position to block the rotation of the outer door handle (3).

4. Door fitting (1) according to one of claims 1 to 3, wherein the inner door handle (2) can be rotated back into its horizontal starting position for rotationally unlocking the outer door handle (3), so that both door handles (2, 3) can be operated equally.

5. Door fitting (1) according to one of claims 1 to 4, wherein all components for rotational locking and unlocking of the external door handle (3) are arranged in and on the internal door handle (2) and are not visible from the outside.

6. Door fitting (1) according to one of claims 1 to 4, wherein the lifting of the interior door handle (2) causes the rotating drive of a (locking) shaft which extends completely or partially through a lock case and an outer rosette or an outer plate parallel to the handle rotation axis.

7. Door fitting (1) according to one of claims 1 to 4, wherein the lifting of the inner door handle (2) causes an axial movement of a square pin (10) which blocks the rotation of the outer door handle (3).

8. Door fitting (1) according to claim 7, wherein the outside door handle (3) is axially penetrated by the square pin (10) and can be unlocked from the outside by its axial movement.

9. Door fitting (1) for a door with a door leaf, comprising two manually operable actuating handles which are arranged on opposite sides of the door leaf, preferably substantially mirror-symmetrically to the door leaf, and are designed as an inside (2) and outside door handle (3), characterized in that the door fitting comprises a square pin (10) which is provided with a threaded pin (19) which is screwed to a corresponding threaded bore (18) of the interior door handle (2) to produce a substantially axially fixed and rotatable connection, and in that the threaded connection can be subjected to an axially or radially effective spring force to generate a permanent frictional moment.

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