The present invention relates to a device for creating a sabotage protected locking function in a lockable unit, e.g. a door, which, when a rotating function is rotated, when its locking function is activated, transmits a rotary force via a mechanical portion to a lock cylinder, a screw connection, so that it can be locked or unlocked around a space. According to the invention the rotating function has a cylinder formation, which is rotatable around its imaginary central axis in a first round opening, arranged in a first of two metal plates arranged at a distance from each other and covering the mechanical portion. The envelope surface of the cylinder formation touches the edge area of the first round opening, which edge area has, along its circumference, a radially projecting element which, when rotated, slides between the metal plates. The rotating function will then be axially and radially position-orientated and is therefore difficult to loosen or damage in the event of sabotage.

In designs of the type in question on the market, rotating functions are used for lockable units such as doors, windows, hatches or gates, having a handle arranged directly on the pivot shaft which, when rotated, transmits a rotary force via a mechanical portion to a lock cylinder which, locks or unlocks from the outside around a space. The mechanical portion can therefore be influenced by impacts on the handle, which hereby are transmitted directly to the mechanical portion, which gets broken. The end of the pivot shaft projects through an opening in the protective plate. The handle is securely arranged on the end. By prizing behind the handle on the lockable unit with a tool the handle is loosened or the pivot shaft is damaged, enabling the locking function to be activated. It is also simple to drill into the mechanical portion in order to attempt to manipulate it and hence activate a locking function for unlocking without a key or to activate a locking function with a predetermined locking code, which prevents the handle from locking and allows unlocking. The object of the invention is to solve the problems existing in designs mentioned above by making the locking function difficult to reach behind two impact resistant metal plates, which have a round opening through which the rotating function, in the form of a cylinder formation incorporating the handle, is arranged. The cylinder formation is rotatably anchored between the two metal plates with at least one radially projecting element arranged between the two metal plates, which fixes the position of the rotating function rotatably in a sabotage protecting manner.

Thanks to the invention a simple, low cost, well functioning and sabotage protected locking function has been provided, which is difficult to sabotage and to activate, the locking function being arranged in a lockable unit, e.g. a door, a window, a hatch, a cabinet or a gate, which, on being rotated, when its locking function is activated, transmits a rotary force via a mechanical portion to a locking element, e.g. a lock cylinder, a screw connection, for the purpose of locking or unlocking from the outside around a space or an enclosure. When the locking function is deactivated the rotating function locks and cannot therefore transmit the rotary force. According to the invention the rotating function has a cylinder or a cylinder formation, which is axially inserted in a first round opening a predetermined length through a first metal plate situated nearest outwards. The cylinder formation is rotatable around its own imaginary central axis. At a certain distance, approx. 2-10 mm and behind it, a second metal plate is provided, both plates together covering the mechanical portion with their expanding surfaces. The envelope surface of the cylinder formation, on being rotated, then touches the edge area of the first round opening, which edge area orientates the position of the rotating function radially. Along its circumference or periphery the envelope surface has one or more radially projecting elements which, on being rotated, are displayed and guided between the inner walls of the metal plates in order to orientate the position of the cylinder formation axially. The axial position of the projecting element around the envelope surface determines how far the cylinder formation is inserted in the first opening in terms of its length and how much of its length will be visible from the outside. The second metal plate, which is located close to the mechanical portion, has a second opening, through which the end of the cylinder formation can be inserted, or against which it can move if the second opening is smaller than the diameter of the cylinder formation in order to be connected there to an end of the pivot shaft projecting from the mechanical portion. In a preferred embodiment of the invention the end of the cylinder formation, facing the pivot shaft of the mechanical portion, has a connection surface extending across the imaginary central axis and having an elongated space, which extends into the contact surface of a predetermined depth. The length of the space is shorter than the diameter of the cylinder formation. The space provides room for an elongated element, which is arranged at the end of the pivot shaft and extends across the pivot shaft at a clearance from the inner walls and bottom of the elongated space in order to absorb deformations in the event of sabotage of the metal plates without the elongated element striking against the walls and bottom, which would otherwise be further displaced and would damage the rotating function. The surfaces of connection to the duct and the elongated element are then arranged between the metal plates in order to be position orientated by them at that point. The distance between the inner walls of the metal plates, at least in an area lying a few mm radially from the envelope surface, is approx. 2-10 mm, thus creating room there for the elongated element and the projecting element. In order to reduce the risk of sabotage still further the elongated element is a round bar which is rotatably and radially arranged at the end of the pivot shaft, in a recess or opening formation present there, which means that when drilling with a drill through the first metal plate towards the round bar, the latter rotates and manoeuvres the drill away. In this position, when the surface of contact with the space is located between the metal plates, the second round opening has a diameter of approx. 5—15 mm, which is then smaller than the diameter of the first round opening of 20- 70 mm. The diameter of the pivot shaft is then slightly smaller than the diameter of the second round opening of 4—14 mm, which means that the inner wall of the second metal plate covers and protects the end of the pivot shaft, thereby reducing the risk of being able to drill in towards the mechanical portion. The visible part of the cylinder formation, viewed from the outside, is shaped as a handle, which is made in the same piece as the cylinder formation. The envelope surface then extends approx. 1-20 mm with the same diameter out through the first metal plate, making it difficult to access with a tool and prize around the cylinder formation where it touches the edge area in an attempt to gain access to the projecting element which extends around the entire periphery of the envelope surface, which means that the cylinder formation will be very difficult to move out of its position. The metal plates are approx. 0.5-2 mm thick and are constituted in a variant of the invention of two sabotage protecting steel plate covers placed at a certain distance from each other and arranged securely on the outside of the lockable unit, with fastening portions, which extend through the lockable unit, are mounted from inside the space and are therefore inaccessible from the outside. In order to reduce the risk of sabotage still further thought the covers, they abut against the outside of the lockable unit and against a flat metal bottom plate underlying it, which plate is approx. 1-4 mm thick, made of steel plate and having screw holes through which the covers are screwed down. The bottom plate has lateral edges, which are enclosed by two edge areas of the covers in order to fix the covers in position in the lateral direction in the event of sabotage. The round openings each have a sealing packing, e.g. an O-ring, for sealing round the cylinder formation and the pivot shaft, in order to prevent water from leaking in at that point from outside. Draining holes are arranged right at the bottom of the lower sections of the covers to ventilate moisture out from inside the covers.

The invention is described more in detail below with reference to some embodiments of the invention, where

Fig. 1 shows a vertical section through a locking function arranged in a cover with the two metal plates on a lockable unit,

Fig. 2 shows a view of a part of the visible section of the cover viewed from the outside straight towards its outside,

Fig. 3 shows a vertical detail section through the rotating function in the axial direction, and Fig. 4 shows a view straight towards the connecting surface of the end of the cylinder formation and the inner wall of the first metal plate having the space with the round bar.

As can be seen from figs. 1-3 a sabotage protecting locking function 4 is shown on a lockable unit 2 which, on being rotated by a handle 19, activates a rotating function 1, which transmits a rotary force to a mechanical portion 3, having a pivot shaft 20 for rotating the handle, which transmits the rotation further to the locking function 4 and a locking element, e.g. a lock cylinder. Rotating function 1 has a cylinder formation 5, which is axially arranged in a first round opening 7 in a first metal plate 8, which is arranged at a certain distance from a second metal plate 13. Envelope surface 10 of cylinder formation 5 touches the edge area 9 of the first round opening 7 when being rotated, said edge area then orientates the position of cylinder formation 5 radially. Along its circumference the envelope surface 10 has an element 1 1 , which projects radially, longitudinally and continuously for axial position orientation of cylinder formation 5 between metal plates 8, 13. The second metal plate 13 has a second round opening 14 through which the end 12 of cylinder formation 5 is axially connected to the pivot shaft 20 of the mechanical portion 3, said shaft has a predeterminable clearance distance 22 between the end 12 and the end 21 of the pivot shaft 20 in order to take up deformations in the metal plates 8, 13. The metal plates 8, 13 consist of sabotage protective covers 15, made of steel plate, which are securely arranged on the outside 16 of the lockable unit 2 with fastening portions 17 extending through the lockable unit 2. The covers 15 connect to the outside 16 of the lockable unit 2 via an underlying flat bottom plate 31 , which has lateral edges 27, at least two opposing lateral edges 27 of which are enclosed by at least two of the opposing edge areas 18 of covers 15 in order to fix the position of said covers 15 against these in the lateral direction in the event of sabotage. The round openings 7, 14 each have their packing sealing against moisture coming from the outside. At least one draining hole is arranged in the lower sections of covers 15 in order to ventilate out moisture from inside of the covers 15. As shown in fig. 4, the end 12 has a connecting surface 23, which has a radially extending oblong space 24 with a length, which is smaller than the diameter of the cylinder formation 5. The space 24 provides room for a radially extending elongated element 25, which is arranged on the clearance distance 22 from the inner walls 26 and the bottom 32 of the elongated space 24. The elongated element 25 is a round bar 30, which is rotatably and radially arranged at the end 21 of the pivot shaft 20 in a recess or hole formation 29 provided in it, which means that when drilling with a drill against the round bar 30, then same rotates and manoeuvres away the drill.