DE29506016U1 - Lift-lower lock for doors of pressure-resistant control cabinets or the like. - Google Patents

Description

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drying. Ernst Stratmann

PATENT ATTORNEY

D-4000 DÜSSELDORF 1 · SCHADOWPLATZ 9 VNR: 109 126

Dusseldorf, 05 April 1995

9501

Dieter Ramsauer
42555 Velbert

Lift-lower lock for doors of pressure-resistant control cabinets or similar.

The invention relates to a lifting and lowering lock for doors of pressure-resistant switch cabinets or the like, in which projection/rear grip surfaces extending from the door leaf/door frame move past each other when the door is pivoted onto the frame at rear grip/projection surfaces formed by the door frame/door leaf and come into contact with each other when the door leaf is raised/lowered relative to the frame.

Such a lock is mentioned in DE 34 38 603 A1. There is no detailed description of this lock, which is referred to as a "door lifter". It is only mentioned that commercially available door lifters are usually designed in such a way that they lock the raised position of the doors by means of a dead center position, but not their lowered position. In order to also lock the lowered position, a bolt is provided as part of a security lock, which is fastened to the door wall independently of the lifting device and is secured both by the door leaf plate and by the

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door frame and thus suppresses their movement against each other when the bolt is inserted.

Such an arrangement is more favourable than, for example, a door construction in which the hinge side of the door is provided with special so-called pressure-resistant hinges made of tempered steel, while the locking side is equipped with pressure-resistant locks, which are operated using a bar lock and round bars. The function of this door is such that a locking bolt (operated by a bar lock with round bars) locks the fork part, for example carried by the door, with the locking piece carried by the frame. If, for example, a short circuit inside the cabinet causes an increase in pressure, the locking bolt, which is subject to shear stress, still keeps the door closed. This type of construction has both manufacturing disadvantages (fork and locking parts have to be welded on, which causes distortion and dimensional inaccuracies, and assembly is complex) and structural disadvantages {the number of locking points is limited, especially with smaller door heights; The top and bottom edges of the door can only be equipped with one or more locking points using a complex redirection and the operability of the lock becomes worse with an increasing number of locking points).

According to the publication mentioned at the beginning, the increased strength of the door lock is achieved by interlocking the door edge and frame without additional locking elements, thus avoiding the disadvantages described above. Only two hinges are required for the normal mounting of the door. These hinges can be given a pivot point in front of the door, thus giving the door an opening angle of 180° (also for row cabinets).

The object of the invention is to create a lifting and lowering lock for such a cabinet, which on the one hand itself forms a locking device so that this does not necessarily have to be arranged separately from the lock, and on the other hand allows the opening and closing and thus the raising and lowering of the door with as little effort as possible, which on the one hand makes operation easier and on the other hand reduces the mechanical load on the lock.

The problem is solved in that the lock comprises an operating lever which is pivotably mounted on the door leaf about an axis perpendicular to the plane of the door leaf and which via a rod or a gear drive a plate which is vertically displaceably mounted close to the hinge edge of the door leaf and which is supported on hinge devices carried by the door frame.

Such a basic construction has the great advantage that it allows for very different operating options, as will become clear in the various other embodiments. In particular, the plate could carry or form a toothing or rack into which a drive gear engages, which in turn is coupled to a handle lever. This handle lever would then be the actuation for the process of raising and lowering the door.

The handle lever can be formed by a lock that also encompasses the plate with teeth and can be placed on or inserted into the door leaf. Alternatively, the handle lever can be formed by a lever lock that is independent of the plate with teeth and can be placed on or inserted into the door leaf, such as a retractable lever lock, in which case there is preferably a joint connection or a shaft connection between this and the drive of the plate, which can also be designed as a flexible shaft. This shaft connection or joint connection enables the actuation

handle away from the hinge area of the door leaf and, if necessary, enables the handling handle for raising and lowering the door to be used simultaneously as a handle for swinging the door leaf open and closed, whereby this function is achieved better the further the handle is from the hinge axis of the door leaf (larger lever arm).

The hinge devices on which the sliding plate of the lifting and lowering lock rests are expediently implemented by hinge devices that have a pivot point in front of the door leaf and thus also allow an opening angle of 180°, even if it is a row of cabinets. It has proven particularly advantageous if the hinge devices have two hinges and a further bearing point on the door frame between these two hinges, which is rotatably mounted and on which the plate can rest.

It is particularly advantageous if the lifting movement is supported by a spring element arranged between the bearing point and the upper hinge in such a way that at least part of the door weight is balanced.

This spring element can be a coil spring, or alternatively a gas pressure spring. Preferably, the spring force of the spring element should be adjustable so that, depending on the practical reasons, there is no residual force or a certain residual force available to force the door into a clear rest position, either in the raised or lowered position.

Further subclaims deal with the more precise construction of the movable plate and its drive, the hinge devices and the spring element.

The invention is explained in more detail below using embodiments shown in the drawings.

It shows:

Fig. 1 in sub-figures 1A, 1B, 1C in a schematic representation of a door of a pressure-resistant switch cabinet with a lifting-lowering lock designed according to the invention;

Fig. 2 shows a practical embodiment of a lock according to Fig. 1 in connection with the upper hinge device of the door leaf and a central support point on which a gas pressure spring rests;

Fig. 3 a suitable lower hinge device;

Fig. 4 is an enlarged sectional view taken along the line IV-IV of Fig. 2;

Fig. 5 is a view similar to Fig. 2 to explain an arrangement with a spiral spring;

Fig. 6 shows a schematic plan view of an alternative according to the invention with a lever linkage for actuating the sliding plate;

Fig. 7 shows a further alternative in which the sliding plate is operated using a conventional bar lock;

Fig. 8 in two partial views 8A and 8B a component of the lower hinge referred to as head piece according to Fig. 3;

Fig. 9 in two partial views 9A and 9B the middle part of the lower hinge attached to the door leaf according to Fig. 3 as well as the upper hinge according to Fig. 2;

Fig. 10 in two partial figures 10A and 10B a further head piece which is used both in the embodiment according to Fig. 3 and in the upper hinge according to Fig. 2;

Fig. 11 in two different views 11A and 11B a further head piece which is used for the installation of the lifting device and can be seen again in Fig. 2;

Fig. 12 in three different views 12A, 12B, and 12C a receiving part for receiving a spiral compression spring according to Fig. 5;

Fig. 13 shows a view of the rod used in accordance with Fig. 5 for the adjustable reception of the spiral compression spring in accordance with Fig. 5;

Fig. 14 an extension piece for this rod according to Fig. 13;

Fig. 15 in two views 15A and 15B a further head piece, which is arranged in the area of the lifting-lowering device and can be seen again in Figs. 2 and 5 ;

Fig. 16 in two views 16A and 16B a central piece which can be seen in Figs. 2 and 5;

Fig. 17 in two different views 17A and 17B a

further head piece which connects downwards to the middle piece according to Fig. 16A and 16B;

Fig. 18 is a detailed view of the gas spring used in Fig. 2;

Fig. 19 a nose part which creates a connection between the lifting-lowering device according to Fig. 2 or 5 and the sliding plate, for example as can be seen in Fig. 6 ;

Fig. 20 in four partial views A, B, C and D a possibility for storing and operating a sliding plate; and

Fig. 21 is a view similar to Fig. 1A showing a further embodiment.

In Fig. 1, a lifting and lowering lock 10 for a door arrangement 12 can be seen schematically, which consists of a door leaf 14 and a door frame 16 and is intended to close an access opening of a pressure-resistant switch cabinet or the like. Projections 18, 20, 22; or 24, 26, 28 extend from the door leaf 14 or the door frame 16, which can also represent rear gripping surfaces and, when the door leaf 14 is pivoted onto the frame 16, move past rear grips or projections formed by the door frame or the door leaf and, when the door leaf 14 is subsequently lowered (as shown in Fig. 1) with respect to the frame 16, they come together in such a way that mutual locking takes place. In Fig. 1 the locking position is shown with solid lines, while the raised and thus open position is shown with dashed lines.

For this process of lifting to open the door or lowering to close the door, the lock 10 is provided with an actuating lever 32 which is mounted on the door leaf 14 so as to be pivotable about an axis 30 lying perpendicular to the plane of the door leaf and which, via a rod or a gear, activates a

Hinge edge 34 of door leaf 14 drives a plate 36 which is displaceably mounted and which in turn is supported on hinge devices 38, 40, 42 carried by door frame 16, as will be described in more detail below.

This plate 36, which is mounted vertically on the door leaf, is mounted, for example, in Fig. 2 (but also in Fig. 5 or Fig. 20A-D) within a housing, preferably made of plastic, reference number 44, which is attached to the door leaf, whereby the vertical displacement movement preferably occurs in that, see Fig. 6, the plate 38 is provided with a toothing 46 on one of its longitudinal edges, thus forming a rack into which a drive gear 48 engages, which in turn is connected either directly, as shown in Fig. 2, or via an articulated connection 50, as can be seen, for example, in Fig. 6, to a pivotable handle lever 132, so that by pivoting this handle lever by, for example, 90°, the rack moves up or down by a certain amount H (i.e. by the stroke). Such handle levers for moving such a plate are known per se, see for example the applicant's WO 94/15949, or the utility model G 92 17 546.5.

A particularly compact arrangement is obtained if the vertically movable plate with its teeth and the handle lever driving this plate are housed in a common housing, as shown in Fig. 2 and 5 and 20, although due to the close proximity of the handle lever to the pivot axis of the door leaf, an additional handle should be arranged away from the pivot axis to swing the door open, as the forces required to open the door are then lower, due to the then longer lever arm to the pivot axis of the door.

However, if the alternative according to Fig. 6 is used, the handle lever for operating the sliding plate can have a greater distance from the door pivot axis, so that in this case the operating handle and the handle for swinging the door open could be identical.

The exact structure of the pivot lever and the mounting of the push plate 36 are not important for the invention. It is only important that a projection or (e.g. according to Fig. 4) nose 54 extends from the plate, with which the door leaf can be supported on support devices 56 carried by the frame, which are fixed vertically with respect to the frame, but can be pivoted with respect to the frame 16 together with the door leaf 14, for example with the help of hinge devices 38, which consist of a first bearing block 58 screwed to the door frame 16 by means of a head screw 60 and a second part 56 pivotably mounted on this part 58 about an axis 62 which coincides with the pivot axis of the door, to which the nose part 54 may in turn be screwed. By moving the plate 36, the door leaf 14 is raised or lowered relative to the frame 16 by the stroke width H.

Fig. 4 (and Fig. 20D) shows that the plate 36 is arranged essentially on the outer surface of the door leaf 14 and is guided there in a sliding manner within a housing 44 mounted on the door leaf plane and that the nose part 54 extends from this plate 36 through the door leaf 14, for which purpose a corresponding slot is arranged in the door leaf 14 so that the nose part 54 can move by the lifting movement along a direction parallel to the vertical door leaf edge 68. The same applies to the leg 66 of the angled hinge part 56, which leg 66 can be moved by the lifting movement through a corresponding slot-shaped opening in the bent part 68 of the door leaf 14.

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extends through, whereby, as already explained, the nose part 54 is fastened to the front surface of this angle 66 by means of a screw 64. When the plate 36 is displaced by the lifting movement, the door leaf 14 therefore moves upwards or downwards with respect to the vertically fixed hinge part 56.

The nose part, which is shown again separately in Fig. 19, is preferably provided with two through holes so that it can be fastened to the hinge part 56 with two screw bolts 64, in two different positions due to the asymmetry of the protruding nose part, so that the nose protruding into the plate 36 leads to two different positions of the door leaf in relation to the door frame and thus enables the lock to be switched to right or left-hinged doors.

The projection of the nose 70 of the nose part 54 lies in a corresponding recess or recess 72, which can be seen in Fig. 6 within the plate 38.

So that the door leaf remains axially movable in its hinges with respect to the door frame in order to accommodate the lifting movement, the lower hinge 40 according to Fig. 3 (or 240 according to Fig. 21) as well as the upper hinge 42 according to Fig. 2 (or 242 according to Fig. 21) allow such a lifting movement. For this purpose, the lower hinge according to Fig. 3 comprises two hinge brackets 72, 74 connected to the door leaf, which hold a hinge pin 76 between them. A further central bracket 78 screwed to the door frame is provided on this hinge pin 76. The hinge parts 72, 74 and 78 can be seen in individual parts in Figs. 8, 9 and 10, each in a side view and a top view.

According to Fig. 21, the upper hinge 242 is

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Hinge pin 276 is held by hinge brackets 272, 274 connected to the door frame 16, while a central bracket 278 that can rotate and slide on the pin 276 is connected to the door leaf 14. The lower hinge 240 in Fig. 21 is constructed similarly.

As can be seen from Fig. 3 (or 21), the pin length between the two hinge bracket parts 72, 74 (or 272, 274) exceeds the longitudinal extent of the middle hinge part 78 (or 278), so that the latter can move on the pin 76 (or 276) by an amount that corresponds to the lifting height.

At the top left corner of the door leaf shown in Fig. 2 there is a hinge arrangement, which in turn comprises a central part 178 which is screwed to the door frame 16 or can be of a similar design as shown in Fig. 9A, 9B. In the case of a hinge bracket 174 attached to the door leaf 14 in a similar design to Fig. 10A, 10B, a hinge pin 176 extends from this, which extends into another hinge bracket 80 which is also attached to the door leaf 14 and is received there in a bore 82 (Fig. 11). Between these two brackets 17-4, 80, a middle bracket part 178 attached to the door frame 16 can move in a sliding and rotating manner, again by a lifting height of H. A receiving part, which can be seen in three different views in Fig. 12A, 12B and 12C, engages the bracket 80 connected to the door 14 from below. This receiving part 82 is connected to the hinge bracket by means of a pin or screw with an external thread, which is guided on the one hand through a threaded hole 88 in the component 80, and on the other hand through the hole 86 of the receiving part 82, which is received with its flat area 90 in a suitably shaped slot 92 in the hinge bracket 80. This bracket 80 is in turn provided with two

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provided with wind-socket holes 94 into which two fastening screws can be screwed in order to be able to fix this bracket 80 to the door frame according to Fig. 2 or according to Fig. 5. The receiving part 82 has a cylindrical projection 96 which extends from an annular surface 98 and serves to accommodate a compression spring 100, which in turn is attached with its other end to a threaded rod 102 and is supported there on a double nut arrangement with washer 103, 104, 105 provided for pressure adjustment. The threaded rod 102 is in turn screwed into a bracket 106 screwed to the door frame 16, see the two views in Fig. 15A, 15B, specifically into a threaded hole 107, whereby this bracket has two threaded holes in order to be able to fix it to the door frame.

In a similar manner, according to Fig. 21, a compression spring 200 is placed on the bolt 276, which rests either on the bracket 272 or, for pressure adjustment, on an adjusting nut 203 carried by the bolt and presses against the middle part 278 and thus tends to lift the door leaf.

The threaded hole 107 serves to accommodate an end thread 109 of the rod 102, the corresponding thread 209 of the extension piece 110 that may be required or the thread 309 of a gas pressure spring arrangement 111.

The threaded hole 107 of the bracket 106 merges at the opposite end of the bracket into a cylinder hole 112, which forms a stop shoulder 113 and accommodates a hinge pin that extends to a bearing bracket 58, which can have the shape according to Fig. 17A, 17B and is fixed to the door frame by means of a screw that can be screwed into a threaded hole 115. The bracket or center piece 56, already described in connection with Fig. 16A, 16B and Fig. 4, is pivotably mounted on this pin, shown in dashed lines in Fig. 2. The bracket 106 thus fulfills the

Double function of the bearing of the pin 113 as well as the spring arrangement 102 or 111, which each support the door frame 16 and act on the component 80 screwed to the door leaf 14 in such a way that the weight of the door is at least partially balanced. In the position shown in Fig. 5, the spring 100 has pressed the receiving part 82 and thus the hinge bracket 80 until it stops against the bracket 178 attached to the door frame and thus brought the door into its maximum rest position, with the help or control of the lifting arrangement shown in Fig. 5 below and which, when the door is lifted, moves from the original vertical position, solid lines, to the vertical position shown in dashed lines.

By moving the screws 103, 104 on the threaded rod 102, the spring tension of the compression spring 100 can be changed, for example so that the weight of the door leaf 14 is essentially balanced and so when lowering and raising the door with the help of the pivot lever only the friction losses that occur during the movement have to be compensated. However, it will usually be more advantageous to define a clear rest position by either not completely balancing the weight of the door, so that this rest position is the lowered position of the door, or by over-balancing it, so that the rest position is formed by the raised position of the door.

In order to be able to adapt to different door leaves, it is intended to extend the rod 102 shown in Fig. 13 using the extension rod shown in Fig. 14 by screwing the extension rod 110 with its threaded hole 117 onto the external thread 109 of the rod 102. The resulting extended rod is then screwed into the bracket 106 with the thread 209, as already described.

Instead of the spring arrangement as described above,

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A gas pressure spring 111 can also be used, which can be fixed with its eye 119 in the component 80 in a similar way to the receiving part 82.

As can be seen from Fig. 2, it is also possible to adjust the spring tension in this case, namely by screwing the thread 309 of the gas spring to different depths into the threaded hole 107 of the bracket 106 and then securing it by means of a lock nut 121.

Instead of the arrangement according to Fig. 4 (opening angle of 180°), with a smaller maximum required opening angle, it is possible to design the hinge parts (such as 56) not in an L-shape, but rather straight, for example, so that the hinge axis 62 remains behind the door leaf plane.

The hinge devices carried by the door frame 16 for supporting the plate 36 do not necessarily have to be in the form of a hinge and can also be separate from the actual door hinges. Depending on the size of the door, the support or support point (e.g. 38 according to Fig. 21) can also be arranged, for example, above the upper hinge instead of between the door hinges (e.g. 240, 242), which can be useful for very low doors.

Claims (1)

DR.-ING. Ernst Strätman'n PAT E N TAN WA LT D-4000 DÜSSELDORF 1 · SCHADOWPLATZ 9 VNR: 109 126 Dusseldorf, 05 April 1995 Dieter Ramsauer
42555 Velbert Protection claims : 1. Lifting and lowering lock for doors of pressure-resistant switch cabinets or the like, in which projection/rear gripping surfaces extending from the door leaf/door frame move past each other when the door leaf is pivoted onto the door frame at rear gripping surfaces/projection surfaces formed by the door frame/door leaf and come into contact with each other when the door leaf is raised/lowered relative to the door frame, characterized in that the lock (10) comprises an actuating lever (32) mounted on the door leaf (14) so as to be pivotable about an axis lying perpendicular to the door leaf surface, which, via a rod or gear, drives a plate (36) mounted vertically displaceably close to the hinge edge of the door leaf, which plate is supported on hinge devices (38) carried by the door frame (16). 2. Lift-lower closure according to claim 1, characterized in that the plate (36) has a vertical toothing or carries or forms a rack (46) into which a drive gear (48) engages, and that the gear (48) is in turn coupled to a handle lever (32). Lift-lower lock according to claim 2, characterized in that the handle lever (32) is formed by a lock which also includes the plate (36) with the toothing (46) and which can be placed on the door leaf (14) or inserted into it. Lift-lower lock according to claim 1 or 2, characterized in that the handle lever (32) is formed by a lever lock that is independent of the plate (36) with teeth (46) and can be inserted onto or into the door leaf (14), such as a retractable lever lock, and that a joint or shaft connection, in particular a flexible shaft connection, is provided between this and the drive (48) of the plate (36). Lift-lower lock according to one of claims 1 to 4, characterized in that the hinge devices have a pivot point located in front of the door leaf and enable an opening angle of 180° even in row cabinet applications. Lift-lower lock according to one of claims 1 to 5, characterized in that the hinge devices have two hinges and a further bearing point on the door frame between these two hinges, which is rotatably mounted. Lifting-lowering closure according to one of claims 1 to 6, characterized in that the lifting movement (H) is supported by a spring element (102; 111) arranged between the bearing point and the upper hinge in such a way that at least part of the weight of the door leaf is compensated. 8. Closure according to claim 7, characterized in that the spring element comprises a helical spring (100). 9. Closure according to claim 7, characterized in that the spring element comprises a gas pressure spring (111). 10. Lift-lower closure according to claim 8 or 9, characterized in that the spring force of the spring element is adjustable.