Patent Publication Number: US-2020296846-A1

Title: Lockable Electronics Cabinet

Description:
FIELD OF THE INVENTION 
     The present inventive concept relates to a lockable electronics cabinet and a method of assembling the same. 
     BACKGROUND 
     Cabinets or enclosures for permanent installation of electronics, designed to prevent break-in or unauthorized access, are known in the prior art. Various standards for break-in resistance exist, for example Swedish protection classes SN2 and SN3. Optionally, such cabinets may require electromagnetic shielding. 
     SUMMARY 
     It is an object of the present inventive concept to provide an improved solution for such a cabinet. 
     To this end, according to a first aspect of the inventive concept, there is provided a lockable electronics cabinet, comprising a body and a door, where the door is arranged to be opened in a sequence of motions: first, a linear motion perpendicular to the plane of the door in its locked position, then, a rotational motion around a pivot axis. The linear motion occurs with the door being shifted from its original plane to another plane parallel to that original plane. The linear motion of the door away from the body of the cabinet frees the subsequent rotational motion from being constrained by the body of the cabinet, or by adjacent cabinets, allowing for the door during rotational motion to be opened 180 degrees or more. Furthermore, the linear motion allows for easy mating of a gasket with an edge, allowing for a tight seal between door and body. 
     This configuration also allows the pivot axis to extend through the bulk of the door, for example not running through joints or hinges external to the door leaf, as the linear motion gives space for the door to rotate around an axis internal to the door. This frees up space adjacent to the door, that otherwise for example would be taken up by hinges. 
     The door may be suspended with a plurality of rotational joints, the joints lining up along the pivot axis, where the joints are arranged to move along with the door during the linear motion. The term rotational joint should be understood as a joint allowing only rotational motion. Using separate rotational joints and translational joints, with the rotational joints simply following along with the linear motion, provides a mechanism that is more robust and that is easier to secure from break-in. In particular, the mechanism may carry a heavy door needed for, e.g., break-in resistance or electromagnetic shielding. 
     As an example, at least one (or alternatively all) of the rotational joints may be a bearing hinge. 
     To define the linear motion of the door, one of the body and the door may comprise one or more guiding members and the other one of the body and the door may comprise one or more engaging members. For example, the body may comprise one or more guiding members and the door may comprise one or more engaging members. During the linear motion phase, the engaging member engages with a respective guiding member, blocking rotation of the door by providing a linear path for the engaging member. This blocking of rotational motion may be achieved through the combined effect of the door engaging with rotational joints and the engaging member engaging with the guiding member, forming a lever arm between a joint and a guiding member. Suitable placing of this lever arm allows for a door that can be securely closed. 
     The guiding member may have a pre-defined opening through which the engaging member may escape. The engaging member thus being free from the guiding member at a suitable point of the linear motion, opening of the door may proceed with the rotational motion of the door around the pivot axis. 
     The guiding member and the joints may be located adjacent to a same lateral side of the cabinet. This will result in that the lever arm referred to above will be at an almost right angle with the face of the door. This saves space. 
     The door may comprise a lock, a bolt of which, with the door in closed and locked position, extends out of a lateral side of the door. The word bolt is to be interpreted as including hook bolts. Alternatively, if the bolt is not extending out of a lateral side of the door, the lock may at least be located adjacent to a lateral side of the door. This lateral side may be the same lateral side adjacent to which said one or more guiding members and the plurality of joints are located. This saves further space. 
     To drive the linear motion, the cabinet may comprise a linear motion mechanism, which comprises a driving member, where the driving member is configured to run along a pre-determined path and to engage with a first guiding track resulting in the driving member driving the linear motion of the door with respect to the body of the cabinet. The pre-determined path may be defined by the driving member engaging with a second guiding track, but may also for example be realized by the driving member running on a rail. The second guiding track may be configured to be stationary during the linear motion and the first guiding track may be configured to move along with the linear motion. 
     The first guiding track may, with said driving member being located at a point along the pre-determined path, have a tangent direction at its point of engagement with the driving member different from a tangent direction of the pre-determined path at the point where the driving member is located. This difference of tangent direction inflicts a transversal force component on the first guiding track, accomplishing the linear motion. 
     More specifically, in a preferred embodiment, the body may comprise the linear motion mechanism, which comprises a moving frame and a stationary frame. The stationary frame provides a guiding track and is connected to the main part of the cabinet body. The moving frame provides a different guiding track and is connected to the door. The driving member is configured to engage with both guiding tracks, where one of the guiding tracks has a slant or slope different from that of the other guiding track. Such a mechanism allows for smooth and secure operation of the door. 
     To engage with the guiding tracks, the driving member may for example be provided with one or more wheels on bearings. A lever may be connected to the driving member, allowing for a user to operate it. Alternatively, the driving member may be driven by a motor or actuator. 
     The ratio of transmission of a motion of the driving member to the linear motion may be adjusted according to need by changing the slope of either guiding track. Thus the direction of tangent may be varying at different positions along the guiding track. A high ratio of transmission may be desirable when the door is moving freely, while a low ratio of transmission may be desirable when there is an additional force to overcome, for example at a position when a groove of a gasket is to be mated with an edge. By an appropriate choice of slopes, the force felt when operating the driving member may be kept roughly constant during the whole linear motion. For example, the pre-determined path and/or one guiding track may be vertical and/or linear and the other one sloped. This has the advantage of less space being taken up lateral to the vertical guiding track. Even more specifically, the stationary guiding track may be vertical and/or linear and the moving guiding track may be sloped. This has the advantage of the driving member not moving in a horizontal direction. Thus, for example, a handle operating the driving member will exclusively move in a vertical direction. 
     The driving member may be supported so that any force applied to it does not have to work against the weight of the driving member. Such support may for example be provided by a gas spring. This makes the mechanism easier to operate. 
     The body may comprise an attenuating mechanism, where the engaging member of above is configured to engage with the attenuating mechanism during at least part of the rotational motion. Such an attenuating mechanism may avoid slamming of the door into the the body during rotational motion when closing the door. 
     Furthermore, the attenuating mechanism may be configured to guide the engaging member, during the rotational motion when closing the door, into the guiding member in preparation for the linear motion. The attenuating mechanism may for example be comprised of a U-shaped gripping member connected to a gas spring. 
     The cabinet may optionally be electromagnetically shielded. 
     The cabinet may comprise a gasket, defining a groove, and an edge, where the edge, with the door in closed position, mates with the groove forming an interface between the door and the body. 
     In case of electromagnetic shielding, the gasket may be a beryllium gasket, allowing for tight, electromagnetically shielded sealing between the door and the body. 
     The gasket may be located on the door, allowing for easy repairs or exchange of the gasket. 
     According to a second aspect of the inventive concept, there is provided a lockable electronics cabinet, comprising a body, a frame and a door, where the body comprises a number of plates and is supported by the frame and where the frame is located outside an innermost layer of the plates. The frame thus not extending into the inside of the cabinet has the advantage of providing more space inside of the cabinet. Furthermore, installation of electronic equipment therein is simplified by the frame not being in the way during installation. 
     The frame may possibly extend exclusively along a top side, a bottom side, and one lateral side of the cabinet. Having the frame located on only one lateral side of the cabinet saves space. 
     The plates the body and the frame may possibly be composed of parts suitable for flat-pack transport, i.e., in packages having two dimensions considerably larger than a third one. This is possible if the body and the frame themselves consist of parts that fit into such packages and may be provided in a kit of such packages. This has the advantage of simplifying installation of the cabinet, as flat packages are easy to transport, even into cramped spaces. 
     The frame may possibly comprise one or more parts, extending along the bottom side one lateral side (thus being substantially L-shaped), or possibly along the whole or of part of the top side, thus substantially having a U-shape or a truncated U-shape. This provides a frame that is sturdy, the parts of which still fitting into a flat package. 
     The frame may further comprise a substantially U-shaped top part, in one or more pieces. 
     A locking mechanism and/or a door opening mechanism may possibly be located adjacent to the lateral side of the frame. This has the advantage of using the space in any case needed by the frame. 
     According to a third aspect of the inventive concept, there is provided a method for assembling a lockable electronics cabinet, comprising the steps of providing frame and body parts in flat packages; and assembling the cabinet out of those parts at a site at which the cabinet is to be located. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above, as well as additional objects, features and advantages of the present inventive concept, will be better understood through the following illustrative and non-limiting detailed description of preferred embodiments, with reference to the appended drawings, where the same reference numerals will be used for similar elements, wherein: 
         FIG. 1 a    is an exploded perspective view of a cabinet. 
         FIG. 1 b    is a perspective view of the inside of a door of the cabinet. 
         FIGS. 1 c -1 f    are perspective views of a cabinet at various stages of assembly. 
         FIG. 2 a    is a perspective view of three assembled cabinets in closed configuration. 
         FIG. 2 b    is a planar view of the same, seen from above. 
         FIG. 3 a    is a perspective view of three assembled cabinets, where the door of the middle cabinet has been brought forward in a linear motion from closed position. 
         FIG. 3 b    is a planar view of the same, seen from above. 
         FIG. 4 a    is a perspective view of three assembled cabinets, where the door of the middle cabinet has been partially opened in a rotational motion. 
         FIG. 4 b    is a planar view of the same, seen from above. 
         FIG. 5 a    is a perspective view of three assembled cabinets, where the door of the middle cabinet is fully opened. 
         FIG. 5 b    is a planar view of the same, seen from above. 
         FIG. 6 a    is a planar view, seen from above, of a cabinet where the door is fully opened. 
         FIG. 6 b    is a perspective view of the same, focusing on the attenuating mechanism. 
         FIG. 7 a    is a planar view, seen from above, of a cabinet where the door is being closed and is about to engage with the attenuating mechanism. 
         FIG. 7 b    is a perspective view of the same, focusing on the attenuating mechanism. 
         FIG. 8 a    is a planar view, seen from above, of a cabinet where the door is being closed and is engaging with the attenuating mechanism. 
         FIG. 8 b    is a perspective view of the same, focusing on the attenuating mechanism. 
         FIG. 9 a    is a planar view, seen from above, of a cabinet where the door is being closed and about to undergo linear motion. 
         FIG. 9 b    is a perspective view of the same, focusing on the attenuating mechanism and the rail. 
         FIG. 10 a    is a planar view, seen from above, of a cabinet where the door is being closed and undergoing linear motion. 
         FIG. 10 b    is a perspective view of the same, focusing on the guiding member. 
         FIG. 11 a    is a perspective view of the door about to be closed through linear motion, focusing on the operation of the linear motion mechanism. 
         FIG. 11 b    is a planar view of the same, seen from the side. 
         FIG. 12 a    is a perspective view of the door being closed through linear motion, the door just reaching the gasket, focusing on the operation of the linear motion mechanism. 
         FIG. 12 b    is a planar view of the same, seen from the side. 
         FIG. 13 a    is a perspective view of the door being closed through linear motion, the door penetrating the gasket, focusing on the operation of the linear motion mechanism. 
         FIG. 13 b    is a planar view of the same, seen from the side. 
         FIG. 14 a    is a perspective view of the door having being closed through linear motion, focusing on the operation of the linear motion mechanism. 
         FIG. 14 b    is a planar view of the same, seen from the side. 
         FIGS. 15 a -15 c    are cross-sectional views showing the mating of the gasket of the door with the rest of the cabinet, at three different stages of motion. 
         FIGS. 16 a -16 b    shows exemplary guiding tracks of the linear motion mechanism. 
     
    
    
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     An embodiment of a lockable electronics cabinet according to the inventive concept will now be described with reference to the drawings. 
       FIG. 1 a    shows an exploded view of a lockable electronics cabinet  1 . The cabinet comprises a body  3  and a door  5 . The door  5  is arranged to be opened in a sequence of motions, viz., first a linear motion perpendicular to the plane of the door in locked position, then, a rotational motion around a pivot axis. Alternatively stated, it is arranged to be closed in a sequence of motions, viz., first a rotational motion around a pivot axis, then a linear motion perpendicular to the plane of the door in locked position. The linear motion is driven by a linear motion mechanism  6 . The rotational motion is facilitated by an attenuating mechanism  9 . 
     As can be seen, the linear motion mechanism  6  uses space created by the frame  7  on the right side of the cabinet. In the same way, the attenuating mechanism uses similar space at the top of the cabinet. 
     The body  3  comprises a frame  7 , a number of wall sections  21 ,  23 ,  24 ,  25 , the linear motion mechanism  6  and the attenuating mechanism  9 . The frame  7  carries the weight of the cabinet  1  and is located adjacent to the bottom side, right side, and top side of the cabinet. In alternative embodiment, the frame  7  may instead be located adjacent to the bottom side, the left side, and the top side of the cabinet. 
     The door  5  comprises a door leaf  63 , top  57  and bottom  58  plates, providing stiffness to the door, and two locks  65 ,  69 , each with a respective bolt  67 ,  71 , preferably hook bolts. On each top  57  and bottom  58  plate, there is a respective small wheel  59 ,  60  on a bearing. 
     The linear motion mechanism  6  comprises an elongate driving member  45 , a moving frame  43  in the form of a plate, and a stationary frame, in this particular embodiment consisting of two plates  27 ,  28 . The moving frame  43  has an upper  41  and a lower  42  slanted guiding track, each with the same slant and shape. The two plates  27 ,  28  of the stationary frame are attached to the main part of the body  3 , and each provides a respective upper stationary guiding track  29  and a lower stationary guiding track  30 . Providing the tracks on two separate plates  27 ,  28  allows for making the plates thicker than other parts of the body, thereby making the tracks more durable. 
     The door  5  is attached to the moving frame through an upper joint in the form of a bearing hinge  37  and a lower joint in the form of a bearing hinge  38 . These joints engage with the moving frame  43 , and thus the body  3 , at points located above and below the door  5 . The pivot axis formed by the joints extends through the bulk of the door  5 . The pivot axis is located inside of a perimeter formed by a front face of the door  5  and a side face of the door  5 . 
     On the side of the moving frame, the joints  37 ,  38  attach to respective upper  39  and lower rails  40 , which in turn attach to the main part of the moving frame  43 . The moving frame  43  attached to upper  21  and lower  22  rails on the main part of the body  3 , which in turn may slide through bearings against respective upper  19  and lower  20  U-shaped profiles attached to the body  3 . 
     The purpose of the driving member  45  is to drive the linear motion of the door. It has an upper small wheel  49  carried on a bearing and a lower small wheel  51  carried on a bearing. The upper when  49  is configured to engage with the upper stationary guiding track  29  and the upper moving guiding track  41 , while the lower wheel  51  is configured to engage with the lower stationary guiding track  30  and the lower moving guiding track  42 . Furthermore, there is a gas spring  55  attached to the driving member for carrying its weight. This makes the driving member easier to operate, as any applied force will not have to counteract at least part of the weight of the mechanism. Furthermore, this avoids the driving member  47  spontaneously falling back into a lower position due to gravity. The other end of the gas spring  55  is attached to the main body  3 . A hole  53  is provided into which the lock bolt  63  may extend when the cabinet is in locked position, thus preventing the driving member from moving. 
     The driving member may be operated by pulling a handle  47 . The effect of the driving member then engaging with the stationary frame and the moving frame  43  is that the stationary frame and the door  5  undergoes linear motion in a direction perpendicular to a plane parallel to that of the face of the door in locked position, while remaining in a plane parallel to that of the face of the door in locked position. Thus, vertical motion of the handle  47  and the driving member  45  is converted into horizontal motion of the door  5 . The transmission ratio between the vertical motion and the horizontal motion depends on the slopes, i.e., directions of tangent, of the guiding tracks. In principle, for this mechanism to work, the slant of the guiding tracks  29 ,  30  of the stationary frame and those  41 ,  42  of the moving frame only need to be different. However, making the tracks of the stationary frame vertical, as in this embodiment, makes them easier to fit in next to the frame  7 . Making the guiding tracks of the moving frame slanted, as in this embodiment, makes the driving member  45  and the handle  47  not move in a horizontal direction, which is convenient. 
     While not strictly necessary, the doubling of the mechanism—i.e., having two wheels and two guiding tracks—as described improves the stability of the cabinet. 
     In alternative embodiments, the driving member may be operated by a motor or by an actuator. 
     The body  3  further comprises an attenuating mechanism  8 , comprised of a U-shaped gripping member  13  connected to a gas spring  11 . The mechanism is arranged so the engaging member  59  of the door  5  is will engage with the gripping member  13  during part of the rotational motion. The attenuating mechanism  8  dampens the rotation, avoiding that the door  5  slams into the body  3 . Furthermore, the gripping member  13  guides the engaging member  59  into the path provided by the guiding member  15 . In some embodiments, a second identical mechanism (not visible) may be located at the bottom of the cabinet. 
     The guiding member  17  provides a U-shaped path for the engaging member  59  of the door  5 . During the linear motion, the wheel  59  is constrained by the two walls of that U-shaped path. This has the effect blocking the door  5  from rotating. The U-shaped path has an edge  15 , defining an opening in the path. When the wheel  59  is located outside that edge  15 , rotational motion is possible, as the wheel  59  is no longer constrained by the guiding member, the door then only engaging with the rotational joints  37 ,  38 . This defines the transition point between the linear motion and the rotational motion. 
     In some embodiments, a second identical guiding member (not visible) may be located at the bottom of the cabinet  1 . 
       FIG. 1 b    shows the inside of a door  5  of the cabinet  1  (cf.  FIG. 1 a   ). Visible again are the top  57  and bottom  58  plates, each with a wheel  59 ,  60  on a bearing. Furthermore, there is a gasket  73  which runs along the perimeter of the inside of the door blade adjacent to the edge of the door  5 . 
     The gasket  73  may for example be made of rubber, or, if electromagnetic shielding is desired, from beryllium. The gasket  73  (cf.  FIGS. 15 a , 15 b , and 15 c   ) provides a groove to which the edge  31  (cf.  FIG. 1 a   ) of the body is to be mated. Having the gasket  73  located on the door  5  and the edge  31  located on the body  3 , as opposed to having the edge  31  located on the door  5  and the gasket  73  located on the body  3 , which also is possible, allows for easy maintenance, repairs, and replacement of the gasket  73 . 
       FIGS. 1 c -1 f    show structural features of the frame and one possible sequence of assembly of the frame and plates of the cabinet body.  FIG. 1 c    shows the cabinet at a first stage of assembly. At this stage, the frame comprises two straight L-profile floor sections  77 ,  79 , and two flat, L-shaped middle sections  73 ,  75 . As the middle sections extend partly along what will be the top of the cabinet, they may also be described as having a (truncated) U-shape. The middle sections  73 ,  75  are connected through a number of connecting segments  81  at their bases. 
       FIG. 1 d    shows the cabinet at a second stage of assembly. The frame has been completed by adding U-shaped top section  83 ,  85  to the top parts of the two middle sections. The top section  83 ,  85  may be made from more than one part or in one piece. More connecting segments  82  have been added between the two middle sections and between the two tips of the U-shaped top section. The frame finished frame only extends on one lateral side of the cabinet, forming a shape like a U laying on the side, as seen from the front of the cabinet. An, upper  21 , a middle  24 , and a lower  25  cover plate have been added, beginning to form the inside of the cabinet. 
       FIG. 1 e    shows an optional configuration wherein three supporting segments  87  have been added to the lateral side of the cabinet opposite to the two middle sections of the frame. These provide stiffness to the construction, but do not carry any substantial weight. 
       FIG. 1 f    shows a further cover plate  23  having been added to the lateral side of the cabinet opposite to the two middle sections of the frame. The fact that no parts of the frame extend into the inner side of the cabinet allows for a flexible space for installing electronics. The frame will not get in the way during installation. 
     Finally, the mechanisms as shown in  FIGS. 1 a    and  1   b  may be added to the cabinet (cf.  FIG. 11 a   ) and covered by external covering plates  89 , as shown in  FIGS. 2 a  and 2 b   , which show three assembled cabinets. 
     Other assembly sequences are equally possible. For example, the frame may be fully assembled before plates are added. As can be seen in  FIGS. 1 c -1 f   , the parts of the frame and the body, including the plates all have their extent along two dimensions significantly larger than their extent along a third dimension. This allows them to be delivered in flat packages that are easy to transport, simplifying installation at the intended site of the cabinet. Flat packages are here defined as packages that have two dimensions significantly larger than a third one. Significantly larger can here be seen as being at least twice as large, or even more preferably at least a third as large. 
     The cabinet is designed to be opened in a sequence of motions: first, a linear motion perpendicular to the plane of the door in its locked position, then, a rotational motion. Conversely, it is designed to be closed with the opposite sequence of motions: first, a rotational motion around a pivot axis, then a linear motion. This basic principle of operation of the cabinet door mechanism will now be described with reference to  FIGS. 2 a -4 b   . Thereafter, the specifics of the rotational motion will be described with reference to  FIGS. 6 a -10 b   . Finally, the specific of the linear motion will be described with reference to  FIGS. 11 a   - 16   b.    
     To aid this description, it is useful to define a number of positions (or states) that the cabinet  1  and its mechanisms pass through during their motion, from a fully closed and locked configuration to a position where the door  5  is fully opened, or vice versa. These positions will then be referred to later on in the text and figures. Thus, define a position A with the door being fully closed and possibly locked and with the gasket mated with the edge, a position B where the linear motion has started and the edge is about to uncouple with the gasket, a position C where the edge is barely touching the gasket, a position D where the linear motion has reached its furthest from the starting position A and the rotational motion is about to start, a position E where the rotational motion has started and the attenuating mechanism is active, a position F where the attenuating mechanism has just let go of the door, and a position G where the door is opened a full 180 degrees. 
     Conversely, when closing the door, position F corresponds to where the attenuating mechanism is just about to start engaging with the door, position E where the attenuating mechanism is engaging with the door, position D where the rotational motion has finished and the linear motion is about to start, position C where the linear motion has reached the point where the edge is touching the gasket, position B where the edge has entered the grooved provided by the gasket and position A where the door is fully closed and possibly locked. 
       FIGS. 2 a  and 2 b    show three fully assembled cabinets  1  in closed position A. The handle  47  of the middle cabinet is being engaged—pulled on upwards—to start the linear motion. 
       FIGS. 3 a  and 3 b    shows the middle cabinet having gone through the linear motion until position D, during which the handle  47  has been brought upwards. The left and right cabinets are still in closed position A. This applies equally in  FIGS. 4 a , 4 b , 5 a , and 5 b   . The door  5  of the middle cabinet can be seen protruding outside the plane formed by the two closed doors, its plane having been parallel shifted, while remains parallel to the plane of the other two doors and to its original plane in position A. The top plate  57  of the door  5  is visible in  FIG. 3   b.    
       FIGS. 4 a  and 4 b    show the middle door  5  in position F, in the middle of the rotational motion. Rotation occurs around the pivot axis defined by the joint  37  and its lower counterpart. 
     Finally,  FIGS. 5 a  and 5 b    show the door of the cabinet in fully open position G. The door can be opened 180 degrees due to the fact that its pivot axis defined by the joint  37  and its lower counterpart has been brought in their entirety outside the plane formed by the other closed cabinets by the linear motion. Thus, rotational motion of the door is not constrained by the body of the cabinet or by the adjacent cabinets. 
     The following paragraphs will describe the operation of the cabinet with focus on the rotational motion, providing the example of closing the door starting at position G and finishing at position A, with reference to  FIGS. 6 a   - 10   b.    
       FIGS. 6 a  and 6 b    show a cabinet with the door  5  in fully open position G. The top plates are not present to allow the attenuating mechanism, comprising the gripping member  13  and gas spring  11 , to be visible. Visible are also the top plate  57 , the gas spring  55  of the driving member, the joint  37 , the wheel/engaging member  59 , and the rail  39 . A user may now start closing the door by pulling on it to start a closing rotational motion. 
       FIGS. 7 a  and 7 b    show the cabinet in position F, the rotational motion thus just having been brought to a position where the gripping member  13  just about to start engaging with the engaging member  59  of the door. As can be seen, if the rotational motion is brought further, the wheel  59  will start to push on the gripping member  13 , placing itself in the U shape of the same. The rotational motion is thus dampened by the gas spring  11  (conf.  FIGS. 6 a  and 6 b   ), preventing the door  5  from slamming into the body. Furthermore, the gripping member  13  will help lead the wheel  59  to a point where it can engage with the guiding member  15  (cf.  FIG. 1 a   ) for the subsequent linear motion. 
       FIGS. 8 a  and 8 b    show the cabinet in position E, where the gripping member  13  of the attenuating mechanism is engaging with the door  5 . The wheel  59  is approaching the edge  17  of the guiding member  15 . 
       FIGS. 9 a  and 9 b    show the cabinet in position D, where the rotational motion has finished and the engaging member  59  has reached the start  17  (cf.  FIGS. 8 a  and 8 b   ) of the path provided by the guiding member  15 . One side of the U-shape of the gripping member  13  engages with the outside of the guiding member  15 , preventing further rotational motion of the gripping member and of the engaging member, positioning the engaging member right at the start  17  of the path of the guiding member  15 . The user may then initiate the linear motion by pulling the lever  47  (cf.  FIG. 1 a   ). The engaging member  59  follows the path provided by the guiding member  15 . 
     Finally,  FIGS. 10 a  and 10 b    show the cabinet in position B, undergoing linear motion. The wheel  59  engaging with the guiding member  15  provides a rotation-blocking lever arm with respect to the pivot axis and joint  37  that is almost at a right angle to the plane of the door. 
     The following paragraphs will describe the operation of the linear motion mechanism, providing an example of the linear motion part of the operation of closing the door, starting at position D and finishing at position A, with reference to  FIGS. 11 a -15 b   . A detailed view of one of the guiding tracks  42  of the moving frame  43  is shown in  FIG. 16 a   , where also the location of the wheel  49  in positions A, B, C, and D are indicated with dashed circles. 
     A detailed view of an alternative guiding track is shown in  FIG. 16   c.    
       FIGS. 11 a  and 11 b    show the cabinet in position D. Side plates of the cabinet are for illustration not shown so as to reveal the linear motion mechanism. The gas spring  59  is visible. The wheels  49 ,  51  of the driving member  45  are positioned at the tops of their respective guiding tracks  41 ,  42 , of the moving frame  43 . The handle  47  may now be pulled to initiate the linear motion. The wheels  49 ,  51  of the driving member  45  then engage with the sloped guiding tracks  41 ,  42  of the moving frame  43 , pushing the moving frame  43  and the door  5  to which it is attached towards the body of the cabinet. The guiding track at this position ( FIG. 16 a    and  FIG. 16 c   ) has a large deviation from the vertical, providing a high transmission ratio between the vertical motion of the handle  47  and the driving member  45  and the horizontal linear motion of the door. 
       FIGS. 12 a  and 12 b    show the cabinet in position C, while  FIG. 15 a    shows a cross-sectional view of the edge  31  and the gasket  73  on the door  5  (only partially shown) with the cabinet in the same position C. The edge  31  is just barely touching the gasket  73 . The slope of the guiding track  41 ,  42  ( FIG. 16 a   ) now changes into one less deviating from the vertical, providing a lower transmission ratio between ratio between the vertical motion of the handle  47  and the driving member  45  and the horizontal linear motion of the door, as a larger force is now required for the edge  31  to penetrate the groove of the gasket  73 , pushing its two sides apart. For example, a 70 mm motion of the lever  47  may here result in a 3 mm motion of the edge  31  into the gasket  73 . 
     As can be seen in  FIG. 16 c   , the transition between the larger slope between positions D and C and a smaller slope between positions C and B may be made smooth, i.e., there being a transition region with continuously varying slope, which ensure smooth operation of the mechanism. 
       FIGS. 13 a  and 13 b    show the cabinet in position B, while  FIG. 15 b    shows a cross-sectional view of the gasket and the edge with the cabinet in the same position B. As can be seen in  FIG. 16 a   , the slope of the guiding track is again slightly more deviating from the vertical, as the required force again diminishes as the groove has been penetrated by the edge. Alternatively, as can be seen in  FIG. 16 c   , the slope may continue to be the same between positions B and A as it was between positions C and B. 
     Finally,  FIGS. 14 a  and 14 b    show the cabinet in position A. The lock holes  33 ,  53  of the stationary frame and of the driving member line up to allow the bolts of the locks to extend through both. With the driving member  45  having been locked that way, even if engaging the lever  47  as shown, the driving member may not be moved.  FIG. 15 c    shows a cross sectional view of the edge and the gasket in the same position A. 
       FIGS. 15 a , 15 b  and 15 c    show cross-sectional views of part of the door  5 , the gasket  73  and the edge  31 . As is evident from  FIGS. 15 a , 15 b  and 15 c   , the linear motion in the plane of the edge  31  facilitates the mating of the groove formed by the gasket  73  and the edge  31 , which otherwise would be hard to perform, forming a tight seal between them. 
       FIG. 16 b    shows the guiding track  41 ′ in an alternative embodiment, where less force is needed to penetrate the gasket, suitable for use with a rubber gasket rather than a beryllium one. 
     In  FIG. 16 a   , the local slope of the guiding track  41  at the end points of the linear motion—position A and in position D—is vertical. This prevents linear motion of the door  5  as long as the driving member  49  or handle  47  is not operated upon. 
     As can be seen when comparing  FIGS. 16 a  and 16 b   , the slope of the guiding track may either vary continuously along the track, or exhibit sudden jumps, all according to needed force. For example, the slope may be designed for a person or machine operating the driving member  45  to experience a roughly constant force throughout the linear motion. 
     Thus, the guiding track  41  may be divided into a number of segments having different slope. Transition regions between these segments may have continuously varying slope to ensure smooth operation of the mechanism. There may be a first region D having a vertical slope, intended for keeping the driving member  49  in place. There may be a second region D-C having a relatively large slope, i.e., with a higher deviation from the vertical, for quickly transporting the door where a relatively small force is needed. There may be a third region C-B with a comparatively small slope, i.e., small deviation from the vertical, where a large force is needed, e.g., to penetrate a gasket. Finally, there may be a fourth region B-A with a slope between those of the second region and the third region one the gasket is penetrated and less force is needed than in the third region. All of these regions are optional and may be combined according to need. 
     The inventive concept has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the inventive concept, as defined by the appended patent claims. 
     The following summarizes example embodiments. 
     To drive the linear motion, the cabinet may comprise a linear motion mechanism, which comprises a driving member, where the driving member is configured to engage with a slanted guiding track resulting in linear motion of the door with respect to the body of the cabinet. More specifically, in a preferred embodiment, the body may comprise the linear motion mechanism, which comprises a moving frame and a stationary frame. The stationary frame provides a guiding track and is connected to the main part of the cabinet body. The moving frame provides a different guiding track and is connected to the door. The driving member is configured to engage with both guiding tracks, where one of the guiding tracks has a slant or slope different from that of the other guiding track. Such a mechanism allows for smooth and secure operation of the door. 
     To engage with the guiding tracks, the driving member may for example be provided with one or more wheels on bearings. A lever may be connected to the driving member, allowing for a user to operate it. Alternatively, the driving member may be driven by a motor or actuator. 
     The ratio of transmission of a motion of the driving member to the linear motion may be adjusted according to need by changing the slope of either guiding track. Thus the slant may be varying at different positions along the guiding track. A high ratio of transmission may be desirable when the door is moving freely, while a low ratio of transmission may be desirable when there is an additional force to overcome, for example at a position when a groove of a gasket is to be mated with an edge. By an appropriate choice of slopes, the force felt when operating the driving member may be kept roughly constant during the whole linear motion. For example, one guiding track may be vertical and the other one sloped. This has the advantage of less space being taken up lateral to the vertical guiding track. Even more specifically, the stationary guiding track may be vertical and the moving guiding track may be sloped. This has the advantage of the driving member not moving in a horizontal direction. Thus, for example, a handle operating the driving member will exclusively move in a vertical direction. 
     The driving member may be supported so that any force applied to it does not have to work against the weight of the driving member. Such support may for example be provided by a gas spring. This makes the mechanism easier to operate. 
     The following lists example embodiments just summarized. 
     9. The lockable electronics cabinet ( 1 ) of any one of the presented embodiments, wherein said cabinet ( 1 ) comprises a linear motion mechanism ( 6 ), said linear motion mechanism ( 6 ) comprising a driving member ( 45 ,  49 ,  51 ), said driving member ( 45 ,  49 ,  51 ) being configured to engage with a slanted guiding track ( 41 ,  42 ), thereby being configured to drive said linear motion. 
     10. The lockable electronics cabinet ( 1 ) of embodiment 9, wherein said body comprises said linear motion mechanism ( 6 ), said mechanism ( 6 ) comprising a moving frame ( 43 ) and a stationary frame ( 27 ,  28 ), said stationary frame ( 27 ,  28 ) providing a stationary guiding track ( 29 ,  30 ) and being connected to a main part of said body ( 3 ), said moving frame ( 43 ) providing a moving guiding track ( 41 ,  42 ) and being connected to said door ( 5 ), said stationary guiding track ( 29 ,  30 ) having a slant different from a slant of said moving guiding track ( 41 ,  42 ), said driving member ( 45 ,  49 ,  51 ) being configured to engage with said first guiding track and said second guiding track. 
     11. The lockable electronics cabinet ( 1 ) of embodiment 10, wherein one of said stationary guiding track ( 29 ,  30 ) and said moving guiding track ( 41 ,  42 ) is vertical. 
     12. The lockable electronics cabinet ( 1 ) of embodiment 11, wherein said stationary guiding track ( 29 ,  30 ) is vertical. 
     13. The lockable electronics cabinet ( 1 ) of embodiments 9-12, wherein said slanted guiding track ( 41 ,  42 ,  41 ′) has a slant varying at different positions along said guiding track ( 41 ,  42 ,  41 ′).