Patent Description:
Fixing systems that affix, i.e. mechanically connect, a plurality of similar or identical modules to a support structure are used in a number of technical applications. Various example of fixing systems are shown for example in <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT>, <CIT> and <CIT>. Frequent examples are electrical systems connecting a plurality of electric or electronic modules to a support structure or hydrodynamic systems connecting a plurality of hydrodynamic modules such as valves to a support structure. Electrical fixing systems may be used in a number of power and/or data distribution systems such as terminal blocks or network racks. Hydrodynamic fixing systems may be used, for instance, in valve clusters.

Generally, it is desirable to provide a versatile fixing system that allows connecting different numbers of modules to the support structure without having to exchange or even redesign the support structure. Furthermore, the mechanical connection between the modules and the support structure must be easy to establish, yet at the same time robust against external forces such as vibrations. This is particularly important in the case of electrical and electronic systems where a stable electric or electronic connection between power or data cables must be guaranteed.

Consequently, there is a need to provide a fixing system that is extensible and can be easily installed while at the same time providing a stable mechanical connection between the modules and the support structure.

The invention provides a fixing system according to claim <NUM>.

According to the invention, a rail fixture is provided as an elongated fixing element in the general form of a rail. Here and in the following, the term rail is not limited to T-beams and I-beams but includes elongated fixing elements with nearly arbitrary cross-sections. By way of example, rail fixtures with an essentially U-shaped cross-section or an essentially X-shaped cross-section are provided. Variations of the above-mentioned cross-sections and beams are also included.

The rail fixture has first interlocking means that are arranged along the rail fixture. As will be described in further detail below, the first interlocking means are arranged and designed to provide a positive lock in interaction with the second interlocking means of the interlocking modules. Preferably, the first interlocking means are provided as one or more sequences of identically formed interlocking elements that are equidistantly arranged along the rail fixture.

Furthermore, a plurality of interlocking modules having second interlocking means is provided that can be affixed to the rail fixture by establishing a positive fit between the first interlocking means of the rail fixture and the second interlocking means of the interlocking modules. The second interlocking means may comprise one or more interlocking elements that are arranged and designed to provide a positive lock in interaction with the first interlocking means of the rail fixture. Particularly, one or more sequences of interlocking elements may be provided along a direction of the interlocking modules that, in the locked configuration, corresponds to the longitudinal direction of the rail fixture. The interlocking modules may be provided with different numbers of second interlocking elements, e.g. different lengths of the sequences of interlocking elements. This may in particular be the case, when the interlocking modules are different, e.g. in terms of the number of electrical contacts of an electrical module. Alternatively, a plurality of identical interlocking modules may be affixed to the rail fixture, thereby having the same number of second interlocking elements.

According to the invention, the first and the second interlocking means are configured and arranged such that the interlocking modules can be affixed to the rail fixture by inserting the second interlocking means through corresponding gaps between the first interlocking means and sliding the interlocking modules along the rail fixture into a positive lock with the first interlocking means. Consequently, gaps are provided between adjacently arranged interlocking elements of the first interlocking means that are shaped and dimensioned so as to allow passage of interlocking elements of the second interlocking means. It is understood that a large number of corresponding shapes of the interlocking elements of the second interlocking means and the gaps between the first interlocking means can be thought of and are part of the present disclosure.

The second interlocking means are inserted through the corresponding gaps such that the second interlocking means lie in a plane behind the first interlocking means when viewed in the direction of the insertion. In other words, the positive lock between the first and second interlocking means is not provided through a lateral, i.e. in the longitudinal direction of the rail fixture, mechanical contact between the first and second interlocking means but through mechanical contact in a vertical direction, i.e. orthogonal to the rail fixture and in the direction of the insertion. The shape and arrangement of the first and the second interlocking means are chosen in a way that the second interlocking means are slidable along the rail fixture after fully inserting them through the gaps between the first interlocking means. In other words, the interlocking modules can be slid along the rail fixture after insertion of the second interlocking means to move the second interlocking means behind the first interlocking means. A thickness of the first interlocking means in the direction of the insertion may be chosen to be compatible with corresponding gaps between the second interlocking means and the body of the respective interlocking module. In other words, the thickness of the first interlocking means may be chosen so as to fit between the second interlocking means and the body of the respective interlocking module in a way that mechanical contact between the first and the second interlocking means is provided in the vertical direction while still allowing the interlocking module to be slid along the rail fixture. By way of example, the thickness of the first interlocking means may be smaller by less than <NUM>, preferably less than <NUM>, than the corresponding gap between the second interlocking means and the body of the respective interlocking module.

Inserting the second interlocking means through corresponding gaps between the first interlocking means and sliding the interlocking modules along the rail fixture into a positive lock, wherein the second interlocking means are arranged behind the first interlocking means when viewed in the direction of insertion, allows for a quick and easy installation of the plurality of interlocking modules on the rail fixture. At the same time, the positive lock between the first and second interlocking means stabilizes the fixing system against vibrations.

The interlocking modules, and in particular their second interlocking means, may be configured such that, when a subsequently inserted interlocking module is slid into abutment with a previously inserted interlocking module that has already been slid into a positive lock with the first interlocking means, the subsequently inserted interlocking module is automatically positioned in a lock position, i.e. a position along the rail fixture where the respective second interlocking means are arranged behind the corresponding first interlocking means.

According to an embodiment, the first interlocking means may comprise at least one first sequence of protrusions equidistantly arranged along the rail fixture, wherein the second interlocking means may comprise at least one second sequence of equidistantly arranged protrusions, configured to be insertable through the gaps between the protrusions of the first sequence. The at least one second sequence of protrusions is thus arranged on the respective interlocking module so as to be oriented in a longitudinal direction of the rail fixture when the interlocking module is affixed to the rail fixture. The protrusions of the first sequence are equidistantly provided such that the protrusions of a corresponding second sequence fit through the gaps between the protrusions of the first sequence. Likewise, the protrusions of the second sequence are equidistantly provided such that the protrusions of the corresponding first sequence fit through the gaps between the protrusions of the second sequence. The rail fixture and the interlocking modules thus comprise at least one pair of correspondingly arranged and designed sequences of protrusions such that the sequence of protrusions of the interlocking modules can be inserted through gaps between the protrusions of the sequence of protrusions of the rail fixture. The protrusions of the respective sequences may be formed, as described above, to provide a positive lock when sliding the protrusions of the second sequence behind the protrusions of the first sequence.

Providing sequences of protrusions that are equidistantly spaced apart as the interlocking mechanism between the interlocking modules and the rail fixture allows inserting the interlocking modules at a convenient position along the rail fixture and subsequently sliding them into abutment with an end clamp fixture as described below or a previously installed interlocking module.

According to a specific embodiment, the at least one first sequence may comprise two first sequences arranged in parallel along the rail fixture and the at least one second sequence may comprise two second sequences arranged in parallel along each of the interlocking modules. Again, the second sequences are arranged on the interlocking modules in such a way that they are oriented along the longitudinal direction of the rail fixture when the interlocking modules are installed on the rail fixture.

Each of the two first sequences may be associated with a corresponding one of the two second sequences to form a pair of sequences of protrusions as part of the interlocking mechanism as described above. To be insertable through the gaps between the protrusions of the first sequence of the pair, the protrusions of the second sequence of the pair as well as their separation are configured as described above. However, the two first sequences, and similarly the two second sequences, do not have to be equal in terms of the design of their respective protrusions. It is merely required that corresponding first and second sequences are designed and arranged to provide the above-described interlocking mechanism. Thus, a shape, number, separation and/or thickness of the protrusions of one of the first sequences may be different from a shape, number, separation and/or thickness of the protrusions of the other of the first sequences wherein a shape, number, separation and/or thickness of the protrusions of the second sequences are adapted accordingly.

The protrusions of the two first sequences may be arranged to face each other across a channel provided in the rail fixture or to face away from each other along a rail of the rail fixture.

In the first case, a channel is provided along the rail fixture that is configured to receive the second interlocking means of the interlocking modules. The channel may be provided in the form of a U-shaped or an X-shaped cross-section of the corresponding part of the rail fixture. According to this first case, the protrusions of the two first sequences face each other across the channel wherein a gap is provided between protrusions that face each other to allow sliding the interlocking modules along the rail fixture. The shape and the size of the protrusions of the two first sequences may be identical to simplify the design, or may differ. To provide the above described interlocking mechanism, the corresponding second sequences of the interlocking modules are arranged on the interlocking modules, for instance on a base part of the interlocking modules, such that protrusions of the second sequences face away from each other and thus, face toward the protrusions of the respective first sequence. This arrangement provides a particularly stable positive lock between the first and second interlocking means as the relatively large distance between the protrusions of the first sequences stabilizes the interlocking modules against torque.

In the second case, a rail is provided along the rail fixture, for instance in the form of a T-beam or an I-beam, wherein the two first sequences are arranged along the rail such that the protrusions of the two first sequences face away from each other and from the rail. Again, the shape and the size of the protrusions of the two first sequences may be identical to simplify the design, or may be different. According to the second case, the corresponding second sequences of the interlocking modules are arranged on the interlocking modules, for instance on a base part of the interlocking modules, such that protrusions of the second sequences face each other. By way of example, a corresponding portion of the base part of the interlocking modules may have an essentially U-shaped or X-shaped cross-section. Consequently, by inserting the second interlocking means through corresponding gaps between the first interlocking means, the second interlocking means embrace the first interlocking means like a clamp. The configuration of the first and second sequences according to the second case allow for a more compact design.

It is understood that the present invention also comprises combinations of the two cases wherein two first sequences are arranged such that their protrusions face each other while further two first sequences are arranged such that their protrusions face away from each other. Furthermore, the two or more first sequences of the first interlocking means may in particular be arranged such that the sequence of protrusions lies in a plane that is parallel to a planar base of the rail fixture that may be used to mount the rail fixture to a support structure such as a wall or a structure element of a vehicle. This particular arrangement allows inserting and removing the interlocking modules in an easy way even after the rail fixture is installed on the support structure.

According to a specific embodiment, the protrusions of the two first sequences may be arranged such that the protrusions of one of the two first sequences face corresponding gaps of the other of the two first sequences and vice versa. Alternatively, the protrusions of the two first sequences may be arranged such that the protrusions of one of the two first sequences face away from corresponding gaps of the other of the two first sequences and vice versa. Consequently, the protrusions of the two first sequences are provided in either case with an offset to each other along the rail fixture. Likewise, the protrusions of the two second sequences are provided with a corresponding offset to each other in the longitudinal direction of the sequences. In the case of second sequences of the same length, this configuration provides interlocking modules that can be rotated by <NUM>° around the vertical axis, i.e. the direction of the insertion, without a change to the configuration of the second interlocking means. In other words, interlocking modules according to this embodiment may be installed on the rail fixture in two different orientations that are rotated with respect to one another by <NUM>°. This is particularly convenient for manual installation if the interlocking modules, e.g. electrical contacts of these modules, are provided in a symmetric form with respect to the above-described rotation. A human operator will therefore not have to consider a particular orientation of the interlocking modules when installing them on the rail fixture.

The fixing system according to the invention further comprises two end clamp fixtures, wherein each end clamp fixture has third interlocking means configured such that the end clamp fixture can be affixed to the rail fixture by inserting the third interlocking means through corresponding gaps between the first interlocking means into a positive lock. Different from the second interlocking means, the third interlocking means of the end clamp fixtures are configured to establish a positive lock with the first interlocking means without having to slide the inserted end clamp fixtures along the rail fixture. In other words, the end clamp fixtures, after inserting the third interlocking means through corresponding gaps between the first interlocking means, remain in the same position along the rail fixture. The positive lock between the third interlocking means and the first interlocking means is thus provided through lateral mechanical contact of the third interlocking means with the first interlocking means. To this end, the third interlocking means may be shaped and dimensioned so as to be insertable into corresponding gaps between the first interlocking means while being laterally in contact with the first interlocking means.

Once inserted, the end clamp fixtures serve as end pieces of the rail fixture that stabilize interlocking modules affixed to the rail fixture between the two end clamp fixtures against sliding movements in the direction of the rail fixture. A human operator may first install a first end clamp fixture, e.g. at or near the start of the rail fixture, subsequently insert the plurality of interlocking modules that are slid into abutment with the first end clamp fixture and the previously inserted interlocking modules, respectively, and complete and stabilize the row of interlocking modules by inserting the second end clamp fixture adjacently and in abutment with the last interlocking module. By using the above described at least one first sequence of protrusions, the end clamp fixtures may be installed at any position along the rail fixture such that a versatile fixing system for affixing various numbers of interlocking modules is provided.

The rail fixture may further comprise at least one through hole at each end of the rail fixture configured to receive at least one corresponding locking element, in particular a pin or a rivet, of the end clamp fixtures. Consequently, the end clamp fixtures are each provided with at least one locking element such that, when inserting the third interlocking means through corresponding gaps between the first interlocking means of the rail fixture, the at least one locking element is simultaneously inserted into the corresponding at least one through hole of the rail fixture. The at least one through hole may be shaped and configured to mechanically engage the at least one corresponding locking element of the end clamp fixture in order to provide a positive lock or a frictional connection. By way of example, a diameter of the at least one through hole may be chosen to be nearly identical to a diameter of a pin or a rivet as the at least one locking element. Alternatively, a screw may be used as the at least one locking element and the at least one through hole may be threaded to receive the screw. A large number of alternative designs of the through hole and/or the locking element may be devised. By way of example, a quarter round insert may be used to rivet the locking element on the opposite side of the rail fixture or of a support structure that the rail fixture is mounted on.

The rail fixture may comprise through holes only at each end of the rail fixture or comprise a sequence of equidistantly distributed through holes along the rail fixture such that the end clamp fixtures can be inserted at a plurality of different positions to allow for installation of a variable number of interlocking modules on a particular rail fixture. To this end, the through holes are arranged at locations that correspond to gaps between the first interlocking means of the rail fixture in view of the configuration of the end clamp fixtures. The at least one locking element of the end clamp fixtures may be configured to be rotatable between a locked and an unlocked position wherein optionally a visual lock mark may be provided on the end clamp fixture for a visual check of the locked position.

The fixing systems described above are highly versatile allowing for easy installation of various numbers of interlocking modules and may be used in a number of different applications. The fixing systems may for instance be used in a modular power connection system as described below to install a plurality of modular terminal cassettes for electrical connection of at least two feeder cables on the rail fixture.

The present invention also provides a method for affixing a plurality of interlocking modules to a rail fixture of a fixing system according to any one of the above-described embodiments, the method comprising:.

The method is a generally performed before installing the entire fixing system on a support structure such as a wall or a structure element of a vehicle. However, depending on the configuration of the above described at least one locking element and the at least one through hole, the method may be performed even after the fixing system is installed on a support structure.

As a first step, a first end clamp fixture is installed on the rail fixture by inserting the third interlocking means of the first end clamp fixture through corresponding gaps between the first interlocking means of the rail fixture to establish a positive lock between the first end clamp fixture and the rail fixture. As described above, the positive lock is established through lateral mechanical engagement of the third interlocking means with the first interlocking means. The first end clamp fixture may be installed at one end of the rail fixture or, if a sequence of through holes is provided along the rail fixture, at a convenient position along the rail fixture.

Consequently, a desired number of interlocking modules is affixed one by one to the rail fixture by inserting the second interlocking means of each interlocking module through corresponding gaps between the first interlocking means and sliding the interlocking modules along the rail fixture into abutment with the already affixed components. Thus, the first of the interlocking modules is inserted and slid along the rail fixture into abutment with the first end clamp fixture while the following interlocking modules are slid along the rail fixture into abutment with the respective previously installed interlocking module.

Finally, the row of installed interlocking modules is terminated by inserting third interlocking means of a second end clamp fixture through corresponding gaps between the first interlocking means of the rail fixture in abutment with the last of the inserted interlocking modules to establish a positive lock between the second end clamp fixture and the rail fixture. The first and the second end clamp fixtures therefore block a longitudinal movement of the interlocking modules that may loosen the positive lock between the first and second interlocking means. As a result, an assembly of a plurality of interlocking modules that are stably connected to the rail fixture is provided that is easily assembled and may easily be disassembled. The entire assembly may then be installed and affixed to a support structure as described below.

As mentioned above, inserting the third interlocking means may comprise inserting at least one locking element, in particular a pin or a rivet, of the respective end clamp fixture through at least one corresponding through hole of the rail fixture and locking the at least one locking element to the rail fixture. By way of example, the at least one locking element may be provided as a screw and may be locked to the rail fixture by turning the locking element. Instead of directly locking the at least one locking element to the rail fixture, the locking element may be configured to be inserted through the through hole in such a way that it extends beyond the through hole. The part of the locking element extending beyond the through hole may then be locked, in particular riveted, to a support structure underneath the rail fixture. Such a support structure may be a wall element or a structure element, for instance of a vehicle such as an aircraft, that has corresponding receiving elements for receiving the extension of the locking elements. By way of example, quarter round inserts may be used to rivet the extensions of the locking elements to a plate of the support structure. A large number of alternative embodiments of the locking elements, through holes and support structure can be thought of and can be used with the present disclosure.

Further features and exemplary embodiments as well as advantages of the present disclosure will be explained in detail with respect to the drawings. It is understood that the present disclosure should not be construed as being limited by the description of the following embodiments. It should furthermore be understood that some or all of the features described in the following may also be combined in alternative ways.

<FIG> shows an exploded schematic view of an exemplary fixing system <NUM> according to the present invention. <FIG> shows the same fixing system <NUM> in an assembled state.

Within limitation, the fixing system of the present invention is illustrated in the Figures with reference to a power connection system wherein the interlocking modules are modular terminal cassettes and/or power distribution terminal cassettes. It is, however, understood that the present invention is not limited to a power connection system but may equally be applied to connection systems for data, valve clusters or other connection systems with modular connection components.

The exemplary fixing system <NUM> as illustrated in <FIG> comprises a plurality of interlocking modules <NUM> in the form of modular terminal cassettes that are mounted on a rail fixture <NUM> by positive locking as described in further detail below. As shown in <FIG>, the rail fixture <NUM> comprises first interlocking means <NUM> to provide a positive fit with corresponding second interlocking means of the interlocking modules <NUM>. A more detailed view of the positive locking can be seen in the cross-sectional view of <FIG>. In the fixing system of <FIG> and <FIG>, the interlocking modules are inserted through the gaps between the first interlocking means <NUM> and slid along the rail fixture <NUM> to establish positive locking between the interlocking modules and the rail fixture.

First, an end clamp fixture <NUM> is installed at one end of the rail fixture <NUM> wherein pins of the end clamp fixture are inserted into through holes <NUM> of the rail fixture. Subsequently, a desired number of interlocking modules <NUM> are inserted and slid along the rail fixture until touching the end clamp fixture <NUM> and each other. The number of interlocking modules can be freely chosen as long as it is compatible with the length of the rail fixture. Finally, a second end clamp fixture <NUM> is inserted with its pins through respective through holes <NUM> of the rail fixture in close contact with the last interlocking module <NUM> in the line to secure the positive lock of the interlocking modules with the rail fixture. The rail fixture <NUM>, with the interlocking modules installed onto it, may then be mounted on a supporting structure <NUM> by inserting the pins of the end clamp fixtures <NUM> into respective holes <NUM> of the supporting structure <NUM>. The pins may then be locked using round inserts as shown in <FIG> by turning the pins into a locked position. Alternative locking means may be devised as required.

The fixing system according to the present invention provides electrical connection for a plurality of feeder cables <NUM> in a simple and robust way. To this end, each feeder cable <NUM> according to the illustrative embodiment of <FIG> and <FIG> is inserted into a respective feeder cable cassette <NUM> that is configured to establish mechanical and electrical connection with a standardized mechanical and electrical interface of the interlocking modules <NUM>. To provide a stable connection of the feeder cable cassettes <NUM> with the interlocking modules <NUM>, each interlocking module of the exemplary embodiment of <FIG> and <FIG> includes a separate locking system <NUM> for each electrical contact of the interlocking module. The supporting structure <NUM> may be mounted in a known way on structures of the respective environment such as a wall element, an aircraft or a car.

<FIG> show a three-dimensional and cross-sectional view of an interlocking module in a positive lock with the rail fixture according to the present invention. For illustration purposes, a single interlocking module <NUM> with two feeder cable cassettes <NUM> connected to either side of the interlocking module mounted on the rail fixture <NUM> is shown. The cross-sectional view of <FIG> clearly shows the positive fit of a base part <NUM> of the interlocking module with the first interlocking means <NUM> of the rail fixture <NUM>.

The non-limiting illustrative example shown in the Figures uses an essentially U-shaped rail as the rail fixture <NUM>. Aside from a planar base <NUM> of the rail fixture that may be mounted on a support structure as explained in detail below with respect to <FIG>, the rail fixture <NUM> comprises side walls that surround a channel <NUM> and include first interlocking means <NUM> at their upper ends. The first interlocking means <NUM> according to the illustrated example include two sequences of teeth-like protrusions <NUM> that are equidistantly arranged along the entire length of the rail fixture <NUM> and separated by gaps. In the illustrated example, protrusions <NUM> and gaps <NUM> are provided with the same width. The present invention is, however, not limited to this configuration.

The two sequences of protrusions <NUM> are further arranged to face each other across the channel <NUM> provided in U-shaped rail fixture <NUM>. In the illustrated example, an offset is provided between the protrusions <NUM> of the two sequences such that the protrusions <NUM> of one of the sequences face gaps <NUM> of the other of the sequences and vice versa. This arrangement has the benefit of second interlocking means <NUM> of the interlocking modules <NUM> that are symmetric with respect to a rotation by <NUM>° with respect to the direction for inserting the interlocking modules.

As will be described in further detail with respect to <FIG> and <FIG>, the base part <NUM> of the interlocking modules <NUM> has second interlocking means <NUM> that, in cooperation with the first interlocking means <NUM> of the rail fixture <NUM>, allow sliding the interlocking module into a positive fit as shown in <FIG>. More specifically, the second interlocking means <NUM> are provided such that their protrusions can be fully inserted through the gaps <NUM> between the protrusions <NUM> of the first interlocking means. A gap <NUM> is provided between the protrusions of the second interlocking means <NUM> and the body of the base part <NUM> with a width that allows sliding the interlocking module <NUM> along the rail fixture <NUM> and yet provides mechanical contact between the protrusions <NUM> of the first interlocking means and the protrusions of the second interlocking means <NUM>. By sliding the interlocking module along the rail fixture, the protrusions of the second interlocking means are positioned behind the protrusions <NUM> of the first interlocking means when viewed from above in the direction of insertion to provide a positive fit. The channel <NUM> of the U-shaped rail fixture <NUM> is dimensioned to accommodate at least the second interlocking means <NUM> after insertion through the first interlocking means.

The depicted feeder cable cassettes of <FIG> are fully locked to the interlocking module <NUM> using the locking system <NUM> as will be described in further detail with respect to <FIG>. The cross-sectional view of <FIG> further shows the electrical connection between the electrical connector <NUM> of the interlocking module and female electrical contacts of the feeder cable cassettes. An elastomeric O-ring may be provided between internal inserts of the feeder cable cassettes <NUM> and the body of the interlocking modules <NUM> to seal the electrical connection between the feeder cable cassettes and the interlocking modules.

<FIG> show a series of schematic views illustrating a method for installing a plurality of interlocking modules on a rail fixture according to the present invention.

In a first step, a first end clamp fixture <NUM> is installed on the rail fixture <NUM> as shown in <FIG>. The end clamp fixture <NUM> comprises third interlocking means <NUM> that, due to the offset between the protrusions <NUM> of the first interlocking means, are arranged on only one side of the end clamp fixture. The present invention is, however, not limited to such a one-sided arrangement of the third interlocking means.

The end clamp fixture <NUM> further comprises two locking elements <NUM> in the form of pins with transversal elements <NUM> in the form of key bits. These locking elements <NUM> are configured to be insertable through correspondingly arranged and designed through holes <NUM> in the form of key holes as shown in <FIG> when inserting the third interlocking means <NUM> through a gap <NUM> of the first interlocking means. By inserting the third interlocking means through the gap, a positive fit is established between the protrusions <NUM> of the first interlocking means and the end clamp fixture <NUM>. According to the illustrative example of <FIG> two sequences of equidistantly arranged key holes <NUM> are provided along the entire length of the rail fixture <NUM> to allow installing the end clamp fixtures <NUM> in a plurality of different positions. Consequently, a single rail fixture may be used for the installation of various numbers of interlocking modules <NUM>.

The exemplary end clamp fixture <NUM> of <FIG>further includes two screw heads <NUM> configured to allow turning the key bits <NUM> of the pins <NUM> into a locked position after inserting them through the key holes <NUM> as indicated in <FIG>. The end clamp fixture <NUM> may be installed at one end of the rail fixture <NUM> as shown in <FIG> or at any other desired position along the rail fixture. After insertion of the third interlocking means through a gap of the first interlocking means, the end clamp fixture is secured against sliding movements. <FIG> further shows the planar base <NUM> of the rail fixture that may be mounted on a support structure as described below.

<FIG> illustrate the installation of a first interlocking module <NUM> on the rail fixture <NUM>. As described in detail above, protrusions <NUM> of second interlocking means <NUM> arranged on the base part <NUM> of the interlocking module are inserted through gaps <NUM> of the first interlocking means as indicated by the direction arrow in <FIG> until the interlocking module can be slid along the rail fixture. In the illustrated, non-limiting example, two sequences of protrusions <NUM> are arranged on the base part <NUM> of the interlocking module to face outwardly, i.e. away from each other. The separation of the two sequences and the size and shape of the protrusions <NUM> are chosen such that they fit into corresponding gaps of the rail fixture while still allowing the interlocking module to be slid along the rail fixture.

After insertion of the second interlocking means through gaps between the first interlocking means of the rail fixture, the interlocking module <NUM> is slid sideways into abutment with the first end clamp fixture <NUM> as indicated by the arrow in <FIG>. As a result of this sliding movement, the protrusions <NUM> of the second interlocking means are positioned behind the protrusions <NUM> of the first interlocking means to provide a positive fit. Subsequently, the next interlocking module may be inserted accordingly and slid into abutment with the already installed interlocking module and so on. <FIG> further show the upper part <NUM> of the interlocking module and an electrical contact <NUM> of the interlocking module in the form of a male contact. It is understood that the depicted embodiment serves to illustrate the present invention without limiting the invention to the particular configuration.

<FIG> show the fixing system <NUM> after the desired number of interlocking modules <NUM> has been installed on the rail fixture <NUM>. The row of installed interlocking modules <NUM> is terminated by inserting a second end clamp fixture <NUM> as described above. <FIG> shows the second end clamp fixture <NUM> installed in abutment with the last installed interlocking module <NUM> to secure the row of interlocking modules against sliding movements. The entire assembly may then be mounted on a support structure such as the support plate <NUM> shown in <FIG>.

The support plate <NUM> may be provided with holes <NUM> as shown in <FIG> that are configured to receive round inserts <NUM> as shown in <FIG> for locking the key bits <NUM> of the pins <NUM> on the opposite side of the support plate as shown in <FIG>. To this end, the pins <NUM> and their key bits <NUM> are inserted through the holes <NUM> and the respective opening of the round inserts <NUM> until the planar base <NUM> of the rail fixture is in contact with the upper side of the support plate <NUM>. Then, the screw heads <NUM> of the end clamp fixtures <NUM> are used to turn the key bits <NUM> into a locked position of the round inserts <NUM> as shown in <FIG> to secure them on the back side of the support plate <NUM>. A visual lock mark <NUM> is provided on a top side of the end clamp fixtures <NUM> as shown in <FIG> to allow visually checking whether the key bits are in the locked position.

Claim 1:
Fixing system (<NUM>), comprising:
a rail fixture (<NUM>) having first interlocking means (<NUM>) arranged along the rail fixture; and
a plurality of interlocking modules (<NUM>) having second interlocking means (<NUM>); the second interlocking means (<NUM>) being arranged on the interlocking module (<NUM>);
the first and second interlocking means are configured such that the interlocking modules (<NUM>) can be affixed to the rail fixture (<NUM>) by inserting the second interlocking means (<NUM>) through corresponding gaps (<NUM>) between the first interlocking means (<NUM>) and sliding the interlocking modules (<NUM>) along the rail fixture (<NUM>) into a positive lock in the direction of insertion of the second interlocking means (<NUM>); and
further comprising two end clamp fixtures (<NUM>), characterized in that each end clamp fixture (<NUM>) has third interlocking means (<NUM>) configured such that the end clamp fixtures (<NUM>) can be affixed to the rail fixture (<NUM>) by inserting the third interlocking means (<NUM>) through corresponding gaps (<NUM>) between the first interlocking means (<NUM>) into a positive lock.