Electrical system to be fitted to a top hat rail

Abstract

Electrical apparatus comprising a base which can accommodate a constituent member, and which can be fitted to a holding rail, in particular a top hat-type rail, via a locking device with two opposite fastening catches (30), one of which is joined to a slide (31).

Description

[0001] This invention concerns an electrical apparatus comprising a base to be fitted to a holding rail, in particular a top hat rail, with opposing coplanar arms, the base being fitted with a locking system having two opposing fastening catches each intended to hook onto a respective arm of the rail, at least one of the catches being joined to a slide capable of sliding in a specific direction, crosswise to the length of the rail, and which can be moved using a manual unlocking device.

[0002] Document FR 2 730 353 shows a device for locking an electrical system on a holding rail, this device comprising two catches interlinked by a spacer frame of which the elastic deformation may be caused via a pull tab accessible from the front. The device is disengaged from the rail via a lateral pull tab that is not easy to operate. Moreover, this device cannot suitably and securely accommodate another device being a part of an electrical apparatus having a base, in particular a processing module, a terminal unit, etc., removably fixed to the base.

[0003] The purpose of the invention is to fix a base to a holding rail but enable the base to be unlocked, on the one hand, via a user-friendly system and, on the other hand, using means capable of securing the addition of another component member of the apparatus on the base.

[0004] According to the invention, the manual unlocking device comprises a lever pivoted around at least one bearing having an axis perpendicular to the sliding direction of the slide, the bearing being, in particular, located near the back side of the base, and the lever cooperates with the slide via a cam device fitted with a slide track guiding an axis parallel to the axis of the bearing. The lever can preferably be maintained by holding means in its locking and unlocking positions.

[0005] In this way, the lever can offer a manoeuvring arm which is unobtrusive in the locking position and projects forward in the unlocking position, in order to cooperate with the rear side of the module, to prevent mounting of the module on the base in the unlocking position and enable it to be mounted in the locking position. The two catches are preferably movable, by being joined to slides symmetrical relation to a mid-planeof the base, the lever cooperating with the slides via two symmetrical cams and axes.

[0006] slide track should preferably be integrated into the lever and the slide is provided with the axis guided in the slide track, this axis being guided in a slit or groove in the base which extends in accordance with the sliding direction of the slide.

[0007] Where the base comprises rigid back walls, it is advisable for the slide to be moulded with the back, and to be separated from rigid back walls by slits. The back may have two hollow parts intended to accommodate the arms of the top hat rail and the lever part fitted with cam sliding tracks projects backwards between the hollow parts.

[0008] There is a description below of an embodiment of the invention, accompanied by attached drawings

[0009] FIG. 1 shows an exploded view of a modular apparatus in accordance with the invention.

[0010] FIG. 2 shows a rear view of the central section of the base of the apparatus shownin FIG. 1.

[0011] FIG. 3 is a front view of the base with the lever in the locking position.

[0012] FIG. 4 is a side view of the base the lever beingshown in its locking position (in full lines) and in its unlocking position (in broken lines).

[0013] FIGS. 5 and 6 show front and side views of the unlocked lever.

[0014] FIG. 7 is an exploded view showing lever and one of the slidescombined with the lever.

[0015] The apparatus illustrated in the figures comprises several electronic modules 10 to be nested or otherwise fitted and snapped onto the individual bases 20 which can themselves be adjacently snap-locked via all usual means on to a top hat holding rail. As a variant, several modules 10 can be nested in the adjacent housing spaces arranged in a same and unique base. The top hat rail R has a standard rail section with two opposing arms R1, R2 and extends along a direction X. When the system is in its operating mode, the module is fitted to the base.

[0016] Each module 10 comprises a casing 11 with a front side 11a and a rear side(11b. On the front side 11a can be fined a terminal block 12 for external connection to automatism electrical members to be controlled or monitored, connections 14 being provided on the front side 11a to cooperate with respective connections or contacts on the terminal block 12. Rear contacts or connection elements 13 are provided on the rear side 11b of the casing.

[0017] The base 20 determines a housing for the rear section of the module 10. It comprises a back 21 lateral walls in the form of vertical partitions 25, 26 and an upper wall(27 and lower wall 28, both horizontal. The base 21 is fitted with an elastic locking device 30 to be fastened on the rail R.

[0018] The back 21 has front connections 23 adapted to cooperate with the contacts 13 of module 10 when the base is locked on the rail(R. The base also has lateral contacts 24 which are used to transmit bus signals to or from the modules and supply voltage for the modules or the automation members. The walls 25-28 comprise faces, slide elements or other guiding elements facilitating the introduction of the module. The partitions 25, 26 are provided with recesses 29 which cooperate with ratchets, elastic parts or other securing forms 15 provided on the module. The forms 15 can be manoeuvred, for example, via two upper and lower pushers, 16 in order to lock the module 10 in a position embedded in the base 20, and in this position the modulefits between the walls 25-28.

[0019] The locking device 30 comprises two opposing securing catches 30, (30-1, 30-2), each linked to a slide 31, (31-1, 31-2), such as a bar or tab, which can be moved in a vertica directionZ, corresponding to the length of the base 20, and which runs perpendicular to X. At the end opposite to the mid-plane P of the base, each slide is connected to a rigid section 32 of the baseback 21 in the form of a hinged connection, this connection, however, allowing movement of the slide. The slide 31 is made up of a section of the base 21, separated from rigid partitions 33 of the back by slits 34 extending in direction Z.

[0020] The locking device 30 comprises an unlocking system made up of a lever 40 pivoted around a bearing axis X1 parallel to direction X. The lever 40 offers, to this end, lateral bearing pins41 pivoted in apertures of the back 21. The lever has a manual control arm 42 and a main pivot body fitted with two cam slide tracks 43 in each of which an axis 44 can be moved along a direction X2, X3 parallel to X and engaged, on the one hand, in a cylindrical hole 35 of the respective slide 31 and, on the other hand, in oblong grooves or slits 36, extending in direction Z, and provided for in lugs 37 of the back. The lugs 37 and main pivot body with the slide tracks 43 project backwards into an intermediate area between the housing zones 38 for the rail R1, R2, this projection being housed in the central recess of the rail. The lever thus occupies a very small space in the back part of the base.

[0021] A return pin spring 39 is associated to one of the slides 31-2, and buttressed against such slide to push it towards plane P.

[0022] As FIG. 4 shows, the rear wall 11b of the electronic module abuts against the operating arm 42 of the lever 40 when the lever is in its generally horizontal unlocking position (depicted in broken lines). The wall 11b, however, allows the module to be secured to the base and connection of contacts 13 and 21 when the arm 42 is moved to its generally vertical locking position (in full lines). Similarly, when the module is fixed and connected, the base 20 cannot be unlockedfrom the rail R.

[0023] The operation of the locking device described is then specified in conjunction with FIGS. 4 to 7.

[0024] As the lever 40 is in the unlocking position (FIGS. 5 and 6, or broken lines in FIG. 4) and is held in this position via stress-threshold hard or snap-lockelements, the slides are then separated (see position shown in broken lines in FIG. 4) and the base can thus be applied on the arms of rail R; the operator can thus pivot the lever into its locking position (see position in broken lines in FIG. 4) and the slides hook onto the edges of the arms, this movement being assisted by spring 38. The lever is held in this position by a hard or snap-lock element. The module can then be engaged into the base and connected and secured to it insofar as the lever 40 is in the unlocked position, it is not possible to slide and connect the electronic module 10 in the base 20 (see this position as illustrated in broken lines in FIG. 4).

Claims

1. Electrical apparatus comprising a base to be fitted to a holding rail, in particular a top hat rail, with opposing coplanar arms, the base being able to accommodate a component member of the apparatus and fitted with a locking device having two opposing catches (30) each intended to hook onto a respective arm of the rail, at least one of the catches being joined to a slide (31) capable of sliding in a direction (Z) and which can be moved by a manual unlocking member,

2. Electrical apparatus according to claim 1, wherein the bearing (41) of the pivoting lever (40) is located near the back (21) of the base.

3. Electrical apparatus according to claim 1, wherein the two catches (31-1, 30-2) are movable, and are joined to slides (31-1, 31-2) that are symmetrical in relation to a mid-plane (P) of the base, the lever (40) cooperating with the slides via two cams and symmetrical axes (43, 44).

4. Electrical apparatus according to claim 1, wherein the lever (40) is integrated into the cam sliding track (43) and the slide (31) comprises the axis (44) guided in the sliding track.

5. Electrical apparatus according to claim 4, wherein the axis (44) of the slide (31) is guided in a slit or groove (36) in the base (20), which extends in the sliding direction (Z) of the slide.

6. Electrical apparatus according to claim 1, wherein the base (20) comprises a rigid back wall and the slide is moulded with the back wall, it being separated from rigid partitions (33) of the back wall by slits (34).

7. Electrical apparatus according to claim 2, wherein a return pin spring (39) is associated to one of the slides (31-2).

8. Electrical apparatus according to claim 2, wherein the back wall (21) offers two housing spaces (38) Intended to accommodate the arms of the top hat rail and the lever part provided with the cam slide tracks (43) projects backwards between these housing spaces.

9. Electrical apparatus according to claim 1, wherein the lever (40) is held in its unlocking position and its locking position via a force-threshold securing system.

10. Electrical apparatus according to claim 1, wherein the system comprises an electronic module (10) removably fastened to the base (20), the pivoting lever (40) having a manoeuvring arm which is unobtrusive in a locking position and projects forward in an unlocking position, in order to cooperate with a rear side of the module to prevent the module to be mounted on the base in the unlocking position and enabling the module to be mounted in the locking position.