DE202019100602U1 - Clamp for applying to different dimensions having standard rails - Google Patents

Abstract

Claw (1), which is designed to have different dimensions having standard rails (100; 102; 104; 106) such. to be releasably fastened in accordance with EU standard, US standard, GB standard and CHE standard, in order to create a holder for accessories such as medical instruments or devices on the standard rails (100, 102, 104, 106) (1) comprises: - a block body (2) having a rail receiving chamber (4) extending in a longitudinal direction of the block body (2), wherein: the rail receiving chamber (4) has a unilaterally open cross sectional profile so as to extend over the whole Length of the block body (2) extending slot opening (6) and the slot opening (6) opposite rear rail contact surface (50) is formed, to the slot opening (6) an upper rail contact surface (58) and a lower rail contact surface (56) adjacent, the upper , lower and rear rail contact surfaces (58, 56, 50) are spaced apart from one another such that all the standard rails (100, 102, 104, 106) can be accommodated therebetween, - a locking device (9), on the side opposite the slot opening (6) of the cross-sectional profile side of the clamp body (2) is arranged and has a contact surface (22) for contacting a side surface of the respective standard rails (100; 102; 104; 106) is formed and whose distance from the slot opening (6) is variable.

Description

Technical area

The present invention generally relates to so-called clamps, which are designed to be releasably mounted on different dimensions having standard rails, in particular according to the following standards. Cocks are used in the human and veterinary fields, in particular in the field of radiation medicine.

Moreover, the present invention relates to a fastening system comprising a plurality of clamps.

Technological background

In principle, standard rails of the type of interest here are used to hold medical devices, such as medical devices. Articulated arms, flowmeters, suction devices, lighting fixtures, armrests, etc., and allow the attachment of such medical devices near the patient. They can be installed in many different locations in health care facilities, ambulances or other means of transport and on many different medical devices such as medical care units, ceiling lights, undercarriages, beds, respirators and anesthesia workstations, and especially operating tables. Medical devices can be attached to a standard rail either directly by clamps or rail clamps.

For the sake of good order, it should be pointed out that the term "rail clamp", as it is to some extent found in the following standards, is to be equated with the term "clamp" used here. In other words, a clamp disclosed here corresponds functionally to a rail clamp in the sense of the cited standards and the two terms are interchangeable.

1. (1) DIN EN ISO 19054:2017-04 : $$„\text{EU}-\text{Normschiene}“=10\text{ mm}\times 25\text{ mm}$$
   
2. (2) US-Norm: $$„\text{US}-\text{Normschiene}“=\mathrm{6,35}\text{ mm}\times \mathrm{31,75}\text{ mm}$$
   
3. (3) BS EN ISO 19054 +A1:2006-09-29 (BSI) Britisch Standards Instution : $$\text{UK}-\text{Normschiene}=3\text{/}8“\left(\mathrm{9,525}\text{ mm}\right)\times 11\text{/}8“\left(\text{34}\text{,925 mm}\right)$$
   
4. (4) SN EN ISO 19054 /A1:2017-02 (SN) Schweizer Norm : $$\text{CHE}=10\text{ mm}\times 30\text{ mm}$$
   

In the present case, standard rails have, for example, the following cross-sectional dimensions:

1. (1) DIN EN ISO 19054: 2017-04 : $$"\text{EU}-\text{standard rail}"=10\text{mm}\times 25\text{mm}$$
   
2. (2) US standard: $$"\text{US}-\text{standard rail}"=6.35\text{mm}\times 31.75\text{mm}$$
   
3. (3) BS EN ISO 19054 + A1: 2006-09-29 (BSI) British Standards Instution : $$\text{UK}-\text{standard rail}=3\text{/}\mathrm{8th}"\left(\mathrm{9,525}\text{mm}\right)\times 11\text{/}\mathrm{8th}"\left(\text{34}\text{, 925 mm}\right)$$
   
4. (4) SN EN ISO 19054 / A1: 2017-02 (SN) Swiss standard : $$\text{CHE}=10\text{mm}\times 30\text{mm}$$
   

As already indicated in the introduction, there is the problem that medical devices such as articulated arms are to be attached to different dimensions having standard rails. Fixable articulated arms are used, among other things, to hold ultrasound probe holders on which ultrasound probes are stored. Ultrasound probes are used in radiation medicine in body orifices to produce ultrasound images. In this case, an exact positioning of the ultrasound probe is decisive. The exact positioning of the ultrasound probe is effected by mechanical properties of the ultrasound probe holder, which can be moved and locked both translationally and rotationally.

A coarse positioning of the ultrasound probe takes place with the aid of the fixable articulated arm. The articulated arm is - usually via a tripod located on the articulated arm - taken on a tripod receptacle on a block, which is pushed onto a standard operating table sliding rail. The block can be guided along the standard rail and fixed at the desired position. When using medical devices and instruments, the clamps are used for their reception and attachment. Depending on their design, the clamps are mounted on operating table slides with the aid of a screw or clamping mechanism. On the long sides of the operating tables are to the left and right so-called rail systems, here referred to in this description as operating table slide rails or standard rails attached to hold medical devices.

Conventional medical clamps are usually designed for attachment to the European version of operating table slides with cross-sectional dimensions of 25 mm x 10 mm. Partly also known as clamps, which are to be mounted on two different standard rails. However, no clamp is known, which is universally applicable to the standard rails on the market. This lack of standardization of rail systems in the different places can lead to dangerous situations when laying the patient.

The technical problem underlying the invention is to provide a clamp, which can be produced inexpensively and in a simple manner allows it to be applied to all mentioned standard rails and releasably locked.

Summary of the Revelation

According to a first aspect of the present invention, a clamp is disclosed which is adapted to accommodate different dimensioned standard rails, e.g. To be detachably fastened in accordance with EU standard, US standard, GB standard and CHE standard in order to create a holder for accessories such as medical instruments or devices on the standard rails. A clamp according to the invention comprises a clamp body which has a rail receiving chamber extending in a longitudinal direction of the clamp body, which has a cross-sectional profile open on one side, so that a slot opening extending over the entire length of the clamp body and a rear rail contact surface lying opposite the slot opening. Adjacent to the slot opening are upper and lower rail contact surfaces. The upper, lower and rear rail contact surfaces are spaced apart from each other such that at least all standard rails of the type mentioned and with the dimensions mentioned can be received therebetween. A locking device is arranged on the side opposite the slot opening of the cross-sectional profile side of the block body and has a contact surface, which is designed for contacting a side surface of the respective standard rail. The distance of the contact surface to the slot opening is variable.

For the first time, it is possible without costly and expensive design with multi-part block body, this apply to different dimensions having standard rails. In general, inventive clamps are therefore universally applicable. The developed for a clamp according to the invention cross-sectional profile allows attachment to standard rails of the type and dimensions mentioned herein. For the first time, a clamp according to the invention offers the possibility of being universally applied to all said standard rails and being able to be used as part of a modular fastening system.

The cross-sectional profile is thus dimensioned in particular such that a rectangular profile with a width of 10 mm (maximum width of all standard rails) and a height of 34.925 mm (maximum height of all standard rails) is receivable and contact points for the slot opening facing the upper and lower Normschienenkanten every standard rail offers.

In an exemplary embodiment of the present invention, the contact surface has a height of at least 16 mm, which is approximately half the height of the maximum height standard rail. This ensures that in all recorded standard rails by the contact surface a desired alignment of the block is ensured on the respective Normscheinen. Preferably, the height of the contact surface corresponds to at least 2/3 of the height of that standard rail, which has the smallest height of all male DIN rail; in the present case, approx. 2/3 * 25 mm. And thus the height of the contact surface is at least 16-17 mm

Preferably, therefore, the height of the contact surface is selected depending on the largest standard rail.

In a further exemplary embodiment of the present invention, the distance of the contact surface from the slot opening perpendicular to the longitudinal direction of the block body and / or perpendicular to the extension direction of the slot opening is variable. Thus, a correct and perfect locking of the clamp on each of the different standard rails can be achieved.

In a further exemplary embodiment of the present invention, the locking device comprises a shaft part with external thread and the block body has a bore with internal thread, in which the shaft part can be screwed. Preferably, the locking device on a handle in the form of a rotary knob or toggle.

In another exemplary embodiment of the present invention, the cross-sectional profile of the block body includes a planar, vertical, rear contact surface, a planar, upper, central contact surface, a planar front contact surface, a planar upper front contact surface, and a planar lower front contact surface. Adjacent contact surfaces are interconnected by transition surfaces.

A wide exemplary embodiment of the present invention provides that adjacent contact surfaces are interconnected by curved transition surfaces.

In yet another exemplary embodiment of the present invention, the transition surfaces have a radius in cross-section and tangentially at adjacent contact surfaces.

In all the aforementioned embodiments of the cross-sectional profile can be ensured that the block is applied to all sizes of standard rails and in cooperation with the locking device correct positioning of the standard rail is guaranteed at least two contact surfaces.

In an exemplary embodiment of the present invention, the planar lower front contact surface is disposed at an angle of 10 ° -60 ° to the planar lower contact surface.

In an exemplary embodiment of the present invention, the planar upper front contact surface is disposed at an angle of 10 ° -60 ° to the planar upper contact surface.

In an exemplary embodiment of the present invention according to one or more of the preceding claims, the cross-sectional profile of the rail receiving chamber is symmetrical about a centerline.

In an exemplary embodiment of the present invention, the block body is integrally formed. Due to the special design of the cross-sectional profile of the clamp body in combination with the locking device, it is no longer necessary for the first time to provide movable parts for forming the appropriate rail for each rail rail to achieve the adaptability to different dimensions of different standard rails.

In another exemplary embodiment of the present invention, the cross-sectional profile is symmetrical with respect to a horizontal centerline extending through the slot opening. Additionally or alternatively, the cross-sectional profile narrows towards the slot opening with decreasing distance to the slot opening. Thus, the distance of the upper and lower contact surface with decreasing distance from the slot opening is getting smaller.

When one-sided attachment of a clamp to a standard rail, it can lead to unwanted degrees of freedom of the instruments in the recording of medical instruments - despite the attachment mechanisms. This may cause the medical instrument to tilt, slip or rotate due to improper mounting by a user during treatment. Due to the one-sided storage of medical instruments and devices on the block, it can lead to elastic deformations and thus to increased mechanical stresses in the components by mechanical force and momentary effects.

To solve this technical problem, according to a further aspect of the present invention, a fastening system is disclosed, which comprises a first block and a second block, which are connected to each other via a connecting rod. Both clamps are formed in accordance with the present disclosure. The connecting rod is connected to the first block at a first end region and to the second block at a second end region.

By this design of a fastening system, the stability of devices and instruments held by the clamps on the standard rails, such as e.g. an immobilizer increased in a simple and safe way. In particular, it may be provided that the connecting rod extends below a patient support, on whose longitudinal sides the standard rails extend.

In an exemplary embodiment of the present invention, the connecting rod is detachably connected to at least one of the two clamps. Preferably for releasable attachment of the connecting rod inserted in a bore of the block and a locking screw presses with a front end against the bore in the connecting rod. The locking screw itself is guided in a threaded bore in the block and has, for example, a handle on an operator end, which facilitates screwing in and out by hand of the locking screw.

In another exemplary embodiment of the present invention, the connecting rod connects the two clamps with each other such that their slot openings face each other.

Due to the positive and non-positive connection technology of the system components, the individual, independent of the overall system, use of system components is possible. For example, the clamps can also be mounted on slide rails on one side.

Due to the possibility of replacing the connection strut with a longer strut, the system can be mounted on any table width.

list of figures

• 1 eine perspektivische Darstellung einen erfindungsgemäßen Befestigungssystems mit zwei Kloben,
• 2 eine Explosionsdarstellung des in 1 gezeigten Befestigungssystems,
• 3 eine perspektivische Darstellung von der Rückseite eines erfindungsgemäßen Klobens,
• 4 eine perspektivische Darstellung von der Vorderseite des erfindungsgemäßen Klobens von 3,
• 5 alle Seitenansichten des in den 3 und 4 gezeigten Klobens,
• 6 eine Seitenansicht eines erfindungsgemäßen Klobens,
• 6a eine vergrößerte Darstellung des Querschnittsprofils des in 5 gezeigten erfindungsgemäßen Klobens,
• 6b eine weitere Ausführungsform eines erfindungsgemäßen Klobens mit abgewandeltem Querschnittsprofil mit Stufenpaaren.
• 7 Seitenansichten eines erfindungsgemäßen Klobens auf verschiedenen Normschiene.

In the following, exemplary embodiments of clamps according to the invention and of a fastening system will be described and explained in detail. Show it:

• 1 a perspective view of a fastening system according to the invention with two clamps,
• 2 an exploded view of the in 1 shown fastening system,
• 3 a perspective view of the back of a clamp according to the invention,
• 4 a perspective view of the front of the inventive block of 3 .
• 5 all side views of the in the 3 and 4 shown Klobens,
• 6 a side view of a clamp according to the invention,
• 6a an enlarged view of the cross-sectional profile of in 5 shown Klobens invention,
• 6b a further embodiment of a clamp according to the invention with a modified cross-sectional profile with step pairs.
• 7 Side views of a clamp according to the invention on different standard rail.

Detailed description

The 1 shows a perspective view of a fastening system according to the invention with two clamps 1 . 1' , Here are the two cocks 1 . 1' over a connecting rod 16 connected with each other. The one cudgel 1 is at an end piece of the connecting rod 16 about one in the block 1 . 1' located hole plugged and by means of a locking device 14 on the connecting rod 16 locked. A second cock 1' is at the other end of the connecting rod 16 also attached and again via a corresponding locking device 14 ' on the connecting rod 16 locked. This is the distance between the two cocks 1 . 1' on the connecting rod 16 variable.

It should be noted that the two cocks 1 . 1' are either identical and only opposite each other on the connecting rod 16 are attached.

Alternatively, it is also possible that the two cocks 1 . 1' are formed mirror-inverted. Anyway, both have cocks 1 . 1' an identical cross-sectional profile of a rail receiving chamber 4 , Furthermore, it is waived, the details of the block 1' to explain. It is in this regard to the explanations to the block 1 Referenced. In the drawings are the same features of the block 1' with the same reference numbers as with the block 1 but the reference numbers are supplemented by "'"; such is the rail receiving chamber 4 in the cockpit 1 in the cockpit 1' marked with 4 '.

The cock 1 has a club body 2 , which is basically formed in this embodiment as a cuboid. In this embodiment, the block body 2 integrally formed. In the club body 2 is a rail receiving chamber 4 present, which has a slot opening 6 is open to the outside. For details of the cross section profile of the rail receiving chamber 4 will be commented below.

As already explained above, the block body 2 a here only indicated hole in which the end piece of the connecting rod 16 plugged. The locking device 14 includes a rotary handle and a shaft portion with external thread in a bore of the shaft body 2 of the club body 2 is screwed with an internal bore and with an end piece of the shaft part on the connecting rod 16 press and lock it at the desired location. On top of the club body 2 For example, here is a hole 8th present, in which a holder (not shown) can be inserted, to which in turn a medical device or instrument such as an armrest or the like can be inserted.

A locking device 9 serves to the body of the club 2 in deferred state on a standard rail, not shown here (see 7a-7d) to hold on and to arrest. The locking device 9 includes a twist grip 10 and a shaft part 12 with external thread, in a corresponding hole in the block body 2 is screwed. This hole extends into the rail receiving chamber 4 , so that the protruding end of the shaft part 12 can press against the standard rail, not shown here. Incidentally, it should be noted that for locking the holder in the bore 8th also a locking device 18 may be present, that of the locking device 9 matches and in another corresponding hole, which is related to the bore 8th crosses, is introduced.

The in the 2 shown exploded view shows the fastening device with two clamps 1 . 1' according to 1 , The items of this fastening device are particularly clear here. It should be emphasized that the fastening device 9 at the end of the shaft part 12 a contact surface 22 which then against the in the rail receiving chamber 4 to be introduced standard rail presses. The height of the area 22 is chosen so that they are preferably at least half of the pressure to be pressed height of the respective smallest standard rail in the receiving chamber 4 has to contribute.

In particular, here is a small plate 20 respectively. 20 ' shown that the articulated arm to the fastening device 10 respectively. 10 ' , also called clamping screw, aligns to prevent twisting.

In the 3 is a perspective view of the club body 2 shown, and in the 4 is another perspective view of diagonally in front of the same club body 2 shown. Thus, the respective surfaces and holes 30 . 32 . 34 and their alignment with each other and their length clearly visible. In particular, it is also apparent that the bore 36 for the locking device 9 extends into the receiving chamber for the standard rail, see in particular left side of 5 , all side views of the club body 2 shows.

The 6 equals to 5 but in particular the cross-sectional profile of the receiving chamber 4 shown enlarged. The club body 2 thus has the rail receiving chamber 4 with the slot opening 6 , A symmetry line 70 (Centerline) extends horizontally through the rail receiving chamber 4 and in the middle of the slot opening 6 , The cross-sectional profile of the rail receiving chamber is symmetrical for this purpose. Alternatively, however, an asymmetrical design is conceivable.

Here, the cross-sectional profile of the rail receiving chamber 4 a vertical, rear contact surface 50 , a lower, central contact surface 52 , an upper, central contact surface 54 , a lower, front contact surface 56 and an upper, front contact surface 58 on. In this embodiment of the cross-sectional profile of the block 2 The cross-sectional profile narrows from the middle of the central contact surfaces 52 . 54 to the slot opening 6 out. In particular, here are the contact surfaces 50 . 52 . 54 . 56 . 58 designed as flat contact surfaces, the transition surfaces having a radius 60 . 62 . 64 . 66 connected to each other. Of course, it is also possible that the transition surfaces are omitted or replaced by other curved surfaces. In addition, it is also possible that all contact surfaces are not flat but have a desired curvature.

• a = 20 mm
• b = 24 mm
• c = 36 mm
• d = 8 mm
• e = 27 mm
• f = 27 mm
• g = 14,15 mm
• i = 3,85 mm
• w = 45, 88°

The dimensions of the cross-sectional profile, as shown in the present figures, are as follows:

• a = 20 mm
• b = 24 mm
• c = 36 mm
• d = 8 mm
• e = 27 mm
• f = 27 mm
• g = 14.15 mm
• i = 3.85 mm
• w = 45, 88 °

At the in 6b schematically illustrated embodiment of a clamp body according to the invention 2 has the cross-sectional profile on the slot opening 6 adjacent areas, so here the upper, front contact surface 58 and the lower, front contact surface 56 and / or the adjacent transition surfaces 60 . 62 . 64 . 66 one or more stages 80 . 82 . 84 . 86 on. From the steps 80 . 82 . 84 . 86 , are each two vertically opposite each other and limit as a pair of stairs a clear height, the height of a respective one of the standard rails 100 . 102 . 104 . 106 equivalent. This is due to the large number of pairs of stages 80 . 82 . 84 . 86 an automatically correct alignment of the block 1 on the respective rail 100 . 102 . 104 . 106 given, ie, the cock 1 . 1' is aligned in cross-sectional view with its center line perpendicular to the standard rail.

If a new standard rail with not to the existing levels 80 . 82 . 84 . 86 suitable height is used, this can still with the hoop disclosed here 1 . 1' used, in particular by the use of the connecting rod 16 in combination with two cocks 1 . 1' a correct alignment of the two connected clamps 1 . 1' on the respective standard rails 100 . 102 . 104 . 106 is guaranteed.

Finally, the show 7a to 7d a club body according to the invention 2 on different standard rails 100 . 102 . 104 . 106 ,

The standard rail 100 corresponds to the CHE standard rail. In the 7b is the US standard rail shown and in the 7c the UK standard rail. In the 7d is in the rail receiving chamber 4 the EU standard rail 106 introduced.

As already shown in the introduction, the standard rails 100 . 102 . 104 . 106 different dimensions, but at least always in the rail receiving chamber at the upper and lower front contact surfaces 56 . 58 created and by means of the locking device 9 and the associated contact surface 22 pressed and thereby the club body 2 even with different design of the standard rails 100 . 102 . 104 . 106 locked correctly. Due to the exemplary height H of the contact surface 22 will ensure that the club body 2 perfect and correct on the respective standard rail 100 . 102 . 104 . 106 is aligned.

Industrial Applicability

An inventive cock 1 is on the respective standard rail 100 . 102 . 104 . 106 deferred or over the slot opening 6 "Hooked". Once a correct position of the club body 2 on the standard rail 100 . 102 . 104 . 106 is achieved, the locking device 14 turned so far until its contact surface firmly on the contact surface of the standard rail 100 . 102 . 104 . 106 opposite side of the standard rail 100 . 102 . 104 . 106 is applied. This is already a correct and stable, at the same time also easily releasable attachment of the block 1 reached.

If necessary, two cocks can 1 . 1' on two opposite standard rails 100 . 102 . 104 . 106 be attached and through the connecting rod 16 be connected to each other. The connecting rod 16 is then in every cock 1 by an associated locking device 18 (that of the locking device 14 corresponds) fixed.

Finally, then a medical device or instrument such as an articulated arm, flow meter, aspirator, lighting device, Armauflag, immobilizer, ultrasound probe holder, etc. by inserting a suitable holder in a hole 8th . 8th' at the cockpit 1 . 1' be attached.

In particular, so medical devices or instruments in many different places and facilities for health care, ambulances or other means of transport and on chassis, beds, ventilators and anesthesia workstations and in particular operating tables using identical Kloben 1 . 1' install

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• DIN EN ISO 19054: 2017-04 [0005]
• BS EN ISO 19054 + A1: 2006-09-29 (BSI) British Standards Instution [0005]
• SN EN ISO 19054 / A1: 2017-02 (SN) Swiss standard [0005]

Claims (15)

Claw (1), which is designed to have different dimensions having standard rails (100; 102; 104; 106) such. to be releasably fastened in accordance with EU standard, US standard, GB standard and CHE standard, in order to create a holder for accessories such as medical instruments or devices on the standard rails (100, 102, 104, 106) (1) includes: - A block body (2) having a in a longitudinal direction of the block body (2) extending rail receiving chamber (4), wherein: the rail receiving chamber (4) has a cross-sectional profile which is open on one side, so that a slot opening (6) extending over the entire length of the block body (2) and a rear rail contact surface (50) lying opposite the slot opening (6) are formed, an upper rail contact surface (58) and a lower rail contact surface (56) adjoin the slot opening (6), the upper, lower and rear rail contact surfaces (58, 56, 50) are spaced apart from one another in such a way that all standard rails (100; 102; 104; 106) can be received therebetween, a locking device (9) which is arranged on the side opposite the slot opening (6) of the cross-sectional profile side of the clamp body (2) and has a contact surface (22) which is adapted to contact a side surface of the respective standard rails (100; 102; 104; 106 ) is formed and whose distance from the slot opening (6) is variable. Cocks after Claim 1 in which the contact surface (24) has a height which is at least half the height of that standard rail (100, 102, 104, 106) which has the greatest height of all the standard rails (100, 102, 104, 106) to be received , Cocks after Claim 1 or 2 in which the distance of the contact surface (24) from the slot opening (6) perpendicular to the longitudinal direction of the piston body (2) and to the extension direction of the slot opening (6) is variable. Claw according to one of the preceding claims, wherein the locking device (9) comprises a shaft part (12) with external thread and the block body (2) has a bore (36) with internal thread, in which the shaft part (12) can be screwed. Clamp according to one or more of the preceding claims, in which: - The cross-sectional profile with respect to a horizontal center line (70) passing through the slot opening (6) is symmetrical, and / or - The cross-sectional profile narrows towards the slot opening (6) out. A block according to one or more of the preceding claims, in which the cross-sectional profile of the block body (2) has a vertical, rear contact surface (50), a planar, upper, central contact surface (54), a planar lower, central contact surface (52), an upper one front contact surface (58) and a lower front contact surface (56) interconnected by transition surfaces (60, 62, 64, 66). Cocks after Claim 6 in which adjoining contact surfaces (50, 52, 54, 56, 58) are interconnected by curved transition surfaces (60, 62, 64, 66). Cocks after Claim 7 in which the transitional surfaces (60, 62, 64, 66) have a radius in cross-section and connect tangentially to abutting contact surfaces (50, 52, 54, 56, 58). Cocks to one or more of the Claims 6 - 8th in that the lower front contact surface (56) is planar and encloses an angle of 10 ° -60 ° with the center line (70). Cocks to one or more of the Claims 6 - 9 in that the upper front contact surface (58) is planar and encloses an angle of 10 ° -60 ° with the center line (70). Claw according to one or more of the preceding claims, wherein the block body (2) is integrally formed. A clamp according to one or more of the preceding claims, wherein the upper front contact surface (58) and the lower front contact surface (56) and / or the adjacent transition surfaces (60, 62, 64, 66) are provided with one or more steps (80 , 82, 84, 86), of which in each case two mutually opposite steps (80, 82, 84, 86) delimit a clear height which corresponds to a height of one of the standard rails (100; 102; 104; 106). An attachment system comprising: - A first block (1) according to one of the preceding claims, - A second block (1 ') according to one of the preceding claims, - A connecting rod (16) which is connected at a first end portion with the first block (1) and with a second end portion with the second block (1 '). Fixing system after Claim 13 in which the connecting rod (16) is detachably connected at least to one of the two clamps (1, 1 '). Fixing system after Claim 13 or 14 in which the connecting rod (16) connects the two clamps (1, 1 ') to one another such that their slot openings (6, 6') face one another.

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