Technical Field
[0001] The present invention finds application in the field of devices for the control of
industrial machines and plants and has for object an electric contact unit or LED
unit designed to be inserted inside an electrical circuit for the control of industrial
machines or plants.
State of the art
[0002] As known, the contact units are electrical devices suitable for being inserted inside
a signalling or control circuit of a machine or industrial plant to send one or more
commands and/or signals.
[0003] Typically, the contact units comprise a casing which houses at its inside one or
more pairs of fixed contacts designed to be placed in electrical communication with
the cables of the electrical circuit to be controlled.
[0004] Moreover, an actuator is provided inside the casing, provided with a movable element
which can be operated by an external control and which carries one or more pairs of
movable contacts so that the latter can be moved closer or further away from the respective
fixed contacts to produce the switching of the associated circuit, according to the
command or signal to be generated.
[0005] LED units are also known which are structurally similar to the aforesaid contact
units but wherein, in place of the mobile actuator, an LED circuit is provided, whose
object is to signal the operating state of a part of the machine or plant by emitting
a light beam.
[0006] In both types of units, the casing houses one or more pairs of terminals for wiring
the contacts, ie for the removable connection of the ends of the electrical terminals
of the circuit with the fixed contacts housed in the casing.
[0007] The most widespread solutions, one of which is described in
US6198058, provide that such terminals comprise a screw which moves a clamping element so as
to clamp it against the electrical contact, blocking the end of the electric cable
thereinside.
[0008] By turning the screw in the opposite direction it is possible to free the cable from
the clamping and disconnect it from the electric unit.
[0009] These known solutions, however widespread, are not exempt from some drawbacks, a
first of which is represented by the relative difficulty for the operators in providing
for the tightening of the screw during the wiring step, which is not immediate.
[0010] Not least, such clamping systems have relatively reduced reliability over time, especially
following high connection and disconnection cycles and can lock when used in dusty
or humid environments due to the accumulation of dirt particles.
[0011] Other solutions, just as easy as the previous one, provide that the contacts consist
of a metal blade that blocks the cable terminals and that is accessible through holes
through which it is possible to operate on the lamella through a tool, such as the
tip of a screwdriver, either directly or through a lever which causes it to be released
or locked. A further solution provides that instead of the screw clamps there are
provided elastic metal plates acting on the contacts for the clamping of the electrical
terminal. The moving away of the resilient lamella from the contact to introduce and/or
remove the terminal is obtained by means of a button which slides into the casing
and can be operated from the outside by means of a pointed tool.
[0012] However, the button is inserted obliquely in the casing while the blade is operated
along a longitudinal direction which is usually the sliding direction of the actuator.
[0013] As a consequence, the button slides in its actuation movement against the wall of
the seat in which it is inserted. Moreover, the presence of a transversal component
of the force to be impressed on the button and the fact that the operator is forced
to operate with the tool in an inclined position makes the operation difficult.
[0014] WO2015/155675 and
DE1690400 both disclose electric devices comprising clamps for wiring electrical contacts,
wherein each clamp comprises an elastic lamella with a contrast arm adapted to hold
the wiring terminals on the electric contacts.
[0015] However, the elastic lamella of each clamp and the respective electric contact are
separated with each other and brought in electric continuity only when the respective
wiring terminal is inserted.
Scope of the invention
[0016] An object of the present invention is to overcome the aforementioned drawbacks by
providing an electrical contact unit or LED unit having features of high efficiency
and relative cost-effectiveness.
[0017] A particular object is to realize an electric contact or LED unit wherein the wiring
of the electrical contacts is simple and rapid.
[0018] Another object is to provide an electric contact or LED unit wherein the terminals
have high reliability over time and in use, even if the unit is inserted into dusty
or humid environments.
[0019] These objects, as well as others which will become more apparent hereinafter, are
achieved by an electric contact or LED unit which, according to claim 1, comprises
a casing housing at least one pair of electrical contacts inside it and having a housing
for an actuator and/or for an LED defining a longitudinal axis of development, one
or more pairs of terminals for wiring said electrical contacts and their connection
to an electric circuit, said terminals being accessible through respective holes of
said casing for inserting the wiring terminals and having each one an elastic lamella
coupled to a respective electrical contact.
[0020] Each of said terminals comprises at least one button slidably inserted into said
casing and adapted to be brought into contact with a respective one of said lamellae
to move it away at least partially from the respective of said electrical contacts
and allow insertion and/or removal of the corresponding wiring terminal.
[0021] In this way, for the wiring of the electrical contacts or the removal of the electrical
terminals it will not be necessary to act directly on the lamella using screwdrivers
or similar tools, with the risk of damaging the lamella.
[0022] The actuation of the pushbutton will allow the insertion and removal of the electrical
terminals of the cables through a simple gesture, allowing to carry out the operation
in a simpler and faster way.
[0023] The use of spring terminals operated by push-button will also be more effective and
safer than common screw terminals, guaranteeing longer life and greater reliability
even in the presence of dust and moisture.
[0024] Moreover, the buttons of each of said terminals are axially slidable in said housing
to transmit a substantially axial stress to the corresponding resilient lamellae.
[0025] In this way, the push-button will slide in its seat without imparting a transverse
stress either to the housing or to the lamella, making the operation easier and more
convenient as the operator can keep the tool used to act on the button in the longitudinal
position and not inclined.
[0026] Each of said resilient lamella comprises at least one pair of contrasting arms separated
from one another and having one end adapted to be placed in contact with a corresponding
electrical contact.
[0027] Moreover, each of said elastic lamellae may be associated with at least one pair
of buttons adapted to operate on a respective one of said contrast arms to selectively
move it away from the corresponding electrical contact.
[0028] In such a way it will be possible to connect to the same electrical contact two different
circuits or in any case two different electrical terminals, allowing their separate
insertion or removal in a particularly easy way.
[0029] Last but not least, the particular configuration of the terminals and of the electrical
contacts will allow to use casing having similar dimensions if not identical to those
of the casing with common screw terminals, and also having the same kind of anchoring
means, to possibly couple in cascade both electric units with screw terminals that
with spring terminals according to the present invention.
[0030] Advantageous embodiments of the invention are obtained according to the dependent
claims.
Brief dislcosure of the drawings
[0031] Further features and advantages of the invention will become more apparent in the
light of the detailed description of some preferred but not exclusive embodiments
of an electric unit according to the invention, illustrated as a non-limiting example
with the aid of the attached drawings wherein:
FIG. 1 is an exploded view of a contact unit according to the state of the art;
FIG. 2 is an exploded view of a contact unit according to the invention in first embodiment;
FIG. 3 is an enlarged perspective view of an elastic lamella of the unit of Fig. 2;
FIG. 4 is a side view of the contact unit of Fig. 2;
FIG. 5 is an enlarged perspective view of an electric contact of the unit of Fig. 2;
FIG. 6 is a bottom view of the contact unit of Fig. 2;
FIG. 7 is a front view of the contact unit of Fig. 2 wherein the casing is without cover
for viewing thereinside;
FIG. 8 is a front view of a variant of the contact unit in a second embodiment wherein the
casing is without cover for viewing thereinside;
FIG. 9 is an exploded view of an LED unit of the invention in a first embodiment;
FIG. 10 is a front view of the LED unit of Fig. 9 wherein the casing is without cover
for viewing thereinside;
FIG. 11 is a front view of the LED unit in a second embodiment wherein the casing is without
cover for viewing thereinside.
Best modes of carrying out the invention
[0032] With reference to the attached figures, some preferred but not exclusive embodiments
of an electric contact unit and an LED electric unit according to the invention are
shown, which are designed to be connected to an electrical system for controlling
a machine or an industrial plant.
[0033] In particular, the contact unit may be connected to one or more control or service
circuits to switch their status according to a command given by a pushbutton or other
connected actuator device.
[0034] Fig. 1 shows a contact unit
U according to the known art made by the same Applicant, wherein there are two terminals
T of the screw type.
[0035] In particular, the unit
U comprises a casing
C suitably shaped at its inside to house an actuator
A designed to be connected to a pushbutton or other control device, not illustrated
as being known per se, and a pair of fixed electrical contacts
F designed to interact with movable contacts
M integral with the actuator
A.
[0036] Inside the housing
C there are also two screw terminals
T for tightening the connection terminals of the electric circuit cables to be connected
to the contact unit
U.
[0037] Fig. 2, instead, shows an electric contact unit according to the present invention, indicated
globally by
1, comprising a casing
2 housing inside it a sliding actuator
3 provided with a pair of movable electric contacts
4 adapted to interact with respective fixed electric contacts
5 arranged in the casing
2.
[0038] The fixed contacts
5 are in turn adapted to be connected to an electrical circuit to be switched by means
of wiring terminals, not shown, which can be inserted through respective side holes
6 of the casing
2, more clearly visible in
Fig. 4.
[0039] The wiring terminals will be appropriately tightened on the fixed electrical contacts
5 by means of corresponding clamps
7 each comprising an elastic lamella
8 coupled with a respective fixed electrical contact
5.
[0040] Furthermore, each clamp
7 also comprises at least one push-button
9 slidably inserted into the casing
2 and adapted to be brought into contact with a respective resilient lamella
8 to remove it at least partially from the respective fixed electrical contact
5 and allow insertion or removal of the corresponding wiring terminal.
[0041] In the shown embodiment, preferred but not exclusive of the invention, each clamp
7, shown in greater detail in
Fig. 3, is associated with a pair of push-buttons
9 which will be accessible from the bottom wall
10 of the casing
2, as more evident from
Fig. 6.
[0042] In turn, each resilient lamella
8 comprises at least one pair of contrast elastic arms
11 which are mutually separated and have one end adapted to be placed in contact with
a corresponding fixed electrical contact
5.
[0043] In this way each clastic lamella
8 will be associated with a pair of push-buttons
9 adapted to operate on a respective contrast arm
11 to selectively move it away from the corresponding fixed electrical contact
5 and allow insertion of the wiring terminal or its removal, without risk of removing
any additional terminal connected to the other contrast arm
11.
[0044] With a rigid conductor, it will not be necessary to press the push-button
9 upon insertion as the terminal itself will produce the deflection of the contrast
arm
11.
[0045] The operation of the push-buttons 9 may be obtained either manually or with the aid
of a tool such as a screwdriver or other pointed tool, avoiding anyway to intervene
directly on the elastic lamella
8.
[0046] Each fixed electrical contact
5 comprises a pair of flat contact surfaces
12 for respective wiring terminals on which a corresponding contrast arm
11 of the respective elastic lamella
8 acts.
[0047] The contact surfaces
12 will be suitably knurled to increase the friction and transversely separated by a
longitudinal slot
13 to allow the passage of the push-buttons
9, as will appear clearer later.
[0048] In turn, each elastic lamella
8 comprises a support plate
14 on which a corresponding contact surface
12 rests and having a first central opening
15 placed at the longitudinal slot
13, again to allow the passage of the push-buttons 9 when these are pressed.
[0049] As visible from
Fig. 7, the contrast arms
11 have a U-shaped configuration so as to be flexible and be deformed by crushing following
the pressure of the corresponding push-button
9, so as to move away from the respective electrical contact
5 and leave the space for insertion of the wiring terminal, or to free it from the
tightening on the fixed electrical contact
5.
[0050] The contrast arms
11 are integral, by means of respective connection members, substantially threadlike,
to the support plate
14 on which the contact surfaces
12 are positioned.
[0051] The connecting elements
16 are offset from each other to define a second opening
17 crossed by an L-shaped formation
18, belonging to the corresponding fixed electrical contact
5 and integral with the respective contact surfaces
12, on whose end a metal pad
19 is arranged, visible in greater detail in
Fig. 5, which will interact with the movable contacts
4 of the actuator
3.
[0052] In this embodiment, the pad
19 is V-shaped with a central groove to increase the points of interaction with the
corresponding movable contact
4 and thus be more efficient. The shapes of the elastic lamellae
8 and of the fixed electrical contacts
5 as illustrated in the figures are only exemplary of the invention since different
shapes can also be used. The push-buttons
9 have a U section with a pair of thrust arms
20 having free ends arranged to act on corresponding contrast arms
11 of the elastic lamellae
8.
[0053] The particular embodiment of the push-buttons
9 will allow them to reach the contrast arms
11 through both the slot
13 of the fixed electrical contact
5 and the opening
15 of the support plate
14 of the elastic lamellas
8.
[0054] In particular, when the push-button
9 is pressed, its thrust arms
20 will be arranged straddling the corresponding contact surface
12 of the fixed electrical contact
5, with the innermost thrusting arm passing through the slot
13 and the central opening
15 to operate on the contrast arm
11 of the lamella
7 without interfering with the fixed electrical contacts
5.
[0055] From
Fig. 6 it is also observed that the push-buttons
9 each have a central notch which will favor the insertion of the tip of a tool such
as a screwdriver or the like, useful for facilitating the pushing of the push-button
9.
[0056] From the same figure it is also observed the presence on the bottom wall
10 of a pair of holes
32 adapted to allow the insertion of the tip of a tester and its contact with the elastic
lamellae
8 for checking electrical continuity with the contacts
5.
[0057] Advantageously, these holes
32, in addition to having dimensions large enough to allow the insertion of the common
testers, have axial development to make the verification operation easy.
[0058] From
Fig. 7, on the other hand, it is observed that the push-buttons
9 are axially slidable inside the casing
2 for transmitting a substantially axial stress to the corresponding elastic lamellae
8.
[0059] In the first shown embodiment, the casing
2 is provided with panel-type anchoring means
21, i.e. associated with the upper wall
22 of the housing
2 for anchoring to an upper panel, not shown.
[0060] Fig. 8 shows a variant of the previous contact unit
1 which differs from this essentially in that the anchoring means
21 are of the box-like type and therefore associated with the bottom wall
10 of the casing
2, to anchor to the bottom wall of a junction box or similar, not shown.
[0061] In this case, the push-buttons 9 will be accessible from the upper wall
22 of the casing
2, whose internal configuration will suitably vary in order to adequately house the
components described above according to the different arrangement, but without this
leading to differences from an operative point of view.
[0062] In this figure, one of the buttons
9, in particular the left one, is shown in the pressed condition in which it operates
on the contrast arm
11 of the corresponding elastic lamella
8.
[0063] According to a particularly advantageous aspect, in both embodiments, the panel or
bottom box type anchoring means
21 may be defined by a pair of flexible fins.
[0064] Moreover, the casing
2 has on the wall
10, 22 opposite to that provided with the fins
21, a pair of slots for the partial insertion of the fins and each having a retaining
tooth
33 adapted to cooperate with the corresponding fins
21 of a further electrical unit placed below or above, depending on the type of anchoring
means
21. In this way it will be possible to place two or more units in position.
[0065] The actuator
3 will have any of the typical configurations for this kind of product and in general
will comprise a slider
23 slidably housed in the casing
2 and having an upper end
24 adapted to protrude from the casing
2 to be connected to an external control, not illustrated as known per se.
[0066] The slider
23 is made integral with the pair of movable electric contacts
4 to bring them into contact with corresponding fixed contacts
5 following its actuation, or to move them away from each other, according to the type
of operation of the unit
1.
[0067] In the configuration in which two or more electric units
1 arc stacked, it will be sufficient that only the slider
23 of the upper unit
1 is connected directly to a push-button or other command since its actuation will
cause the other sliders to be cascaded
23.
[0068] Fig. 9 shows an LED electric unit
25 which differs from the contact units
1 illustrated above essentially in that the casing
2 houses a LED circuit
26 in place of the actuator
3.
[0069] In a known manner, the LED unit
25 may be connected to a control or service circuit in order to signal the operating
status of a part of the machine or plant by emitting a continuous or flashing light
beam.
[0070] The LED circuit
26 essentially comprises a printed circuit
27, simply shown schematically in the figures, electrically connected to the fixed contacts
5, generally by means of soldering pins, and connected to a diode
28 for the emission of the light beam. In this first configuration, the casing
2 comprises panel-type anchoring means
21. Moreover, the LED circuit
26 is associated with an anchoring cradle
29 which allows it to be housed inside the casing
2 and which comprises an anchoring plate
30 for the printed circuit
27 and a collar
31 designed to protrude from the casing
2 for the protection of the LED diode
28.
[0071] In this way the casing
2 may be used both for the assembly of the LED unit
25 and of a contact unit
1 as previously illustrated.
[0072] Fig. 10 shows the same assembled LED unit
25 in which one of the push-buttons
9 is pressed to operate on a corresponding contrast arm
11 of an elastic lamella
8 and move it away from the corresponding fixed electrical contact
5.
[0073] Finally,
Fig. 11 shows a variant of the previous LED unit
25 which essentially differs in that it has anchoring means
21 of the bottom box-type.
[0074] Also in this case one of the push-buttons
9 is shown in the pressed condition in which it operates on the corresponding contrast
arm
11 of an elastic blade
8 to move it away from the corresponding fixed electrical contact
5.
[0075] The electric contact unit or LED according to the invention is susceptible of numerous
modifications and variations, all of which are within the inventive concept expressed
in the appended claims. All the details may be replaced by other technically equivalent
elements, and the materials may be different according to requirements, without departing
from the scope of protection of the present invention.
[0076] Even though the unit has been described with particular reference to the attached
figures, it is understood that various modifications are possible, without departing
from the scope of the present invention, which is defined solely by the appended claims.
1. An electrical contact unit or LED unit for electrical control circuits of industrial
machines or plants, wherein an electric circuit comprises ono or more wiring terminals,
which unit comprises:
- a casing (2) housing thereinside at least one pair of electrical contacts (5) and having a housing defining a longitudinal extension axis (L);
- an actuator (3) or a LED circuit (26) selectively housed into said casing (2) and electrically connected with said electric contact (5);
- at least one pair of clamps (7) for wiring said electrical contacts (5) and the connection thereof to an electrical circuit, said wiring clamps (7) being accessible through respective side holes (6) of said casing (2) for the insertion of the wiring cable terminals and wherein each of said clamps (7) comprises an elastic lamella (8) having one or more contrast arms (11) adapted to hold the wiring terminals on said electric contacts (5);
wherein each of said clamps (7) comprises at least one push-button (9) slidably inserted into said casing (2) and adapted to be brought into contact with a respective of said elastic lamellae
(8) to promote the elastic flexion of said contrast arms (11) and move them away from the respective of said electrical contacts (5) to allow the insertion or removal of the corresponding wiring terminal;
characterized in that each elastic lamella (8) is coupled to the respective electric contact (5), each of said electrical contacts
(5) comprising contact surfaces (12) for respective wiring terminals on which said contrast arms (11) of the respective elastic lamella (8) operates, said elastic lamellae (8) further comprising a support plate (14) integral with the respective contrast arms (11) and on which said contact surfaces (12) of the respective of said electrical contacts (5) lie;
and in that the push-buttons (9) of each of said clamps (7) are slidable in said casing (2) along a respective direction parallel to said longitudinal extension axis (L) for transmitting to a corresponding one of said elastic lamellae (8) an also substantially axial force and in that each of said elastic lamellae (8) comprises at least one pair of contrast arms (11) staggered with each other and having a free end adapted to rest on a corresponding
of said electrical contacts (5).
2. Electric unit as claimed in claim 1, characterized in that each of said elastic lamellae (8) is associated with at least one pair of push-buttons (9) operating on a respective of said contrast arms (11) to selectively move it away from a corresponding of said electrical contacts (5).
3. Electric unit as claimed in claim 2, characterized in that each of said electrical contacts (5) is fixed in said casing (2) and comprises a pair of said contact surfaces (12) for respective wiring terminals on which a correspondent of said contrast arms (11) of the respective elastic lamella (8) operates, said contact surfaces (12) being possibly knurled and transversely staggered by a longitudinal slot (13).
4. Electric unit as claimed in claim 3, characterized in that each of said support plate (14) has a first central aperture (15) located at said longitudinal slot (13).
5. Electric unit as claimed in claim 4, characterized in that each of said push-buttons (9) has a U-section with a pair of thrust arms (20) having free ends arranged to operate on respective contrast arms (11) of said elastic lamellae (8).
6. Electric unit as claimed in any preceding claim, characterized in that said casing (2) has a bottom wall provided with a pair of axial holes (32) communicating with said elastic lamellae (8) for checking electrical continuity.
7. Electric unit as claimed in any preceding claim, characterized in that said casing (2) has anchoring means (21) associated with one between its upper wall (22) and its bottom wall (10), the other of said walls (10, 22) being provided with retaining teeth (33) for engaging the anchoring means (21) of a further stacked electrical unit (1).
8. Electric unit as claimed in any preceding claim, characterized in that said casing (2) houses an actuator (3) having a slider (23) with an end (24) adapted to be connected to an external control and provided with at least one pair
of movable electrical contacts (4) adapted to be brought into contact with corresponding fixed electrical contacts (5).
9. Electric unit as claimed in any claims from 1 to 7, characterized in that said casing (2) houses a LED circuit (26) having a PCB (27) electrically connected to said electrical contacts (5) and a LED diode (28).
10. Electrical unit as claimed in claim 8 or 9, characterized in that each of said elastic lamellae (8) comprises a pair of connecting elements (16) for connecting said support plate (14) to said contrast arms (11), said connecting elements (16) being staggered with each other to define a second opening (17), said electrical contacts (5) having an L-shaped formation (18) extending through said second opening (17) to interact with said movable contacts (4) of said actuator (3) or with said PCB (27) of said LED circuit (26).
1. Elektrische Kontakt- oder LED-Einheit für elektrische Steuerstromkreise von Industriemaschinen
oder -anlagen, wobei ein Stromkreis einen oder mehrere Verdrahtungsanschlüsse umfasst,
wobei die Einheit umfasst:
- ein Gehäuse (2), das darin mindestens ein Paar elektrischer Kontakte (5) aufnimmt und ein Sitz aufweist, das eine Längserstreckungsachse (L) definiert;
- einen Aktuator (3) oder eine LED-Schaltung (26), die selektiv in dem Gehäuse (2) untergebracht und elektrisch mit dem elektrischen Kontakt (5) verbunden ist;
- mindestens ein Paar Klemmen (7) zum Verdrahten der elektrischen Kontakte (5) und deren Verbindung mit einem Stromkreis, wobei die Verdrahtungsklemmen (7) durch entsprechende seitliche Löcher (6) des Gehäuses (2) für die Einsetzen der Verdrahtungskabelanschlüsse und wobei jede der Klemmen (7) eine elastische Lamelle (8) mit einem oder mehreren Kontrastarmen (11) umfasst, die geeignet sind, die Verdrahtungsanschlüsse an den elektrischen Kontakten
(5) zu halten;
wobei jede der Klemmen (7) mindestens einen Druckknopf (9) umfasst, der verschiebbar in das Gehäuse (2) eingeführt und angepasst ist, um mit einer entsprechenden der elastischen Lamellen
(8) in Kontakt gebracht zu werden, um die elastische Biegung der Kontrastarme (11)
und sie von den jeweiligen der elektrischen Kontakte (5) wegbewegen, um das Einführen
oder Entfernen des entsprechenden Verdrahtungsanschlusses zu ermöglichen;
dadurch gekennzeichnet, dass jede elastische Lamelle (8) mit dem jeweiligen elektrischen Kontakt (5) gekoppelt ist, wobei jeder der elektrischen Kontakte (5) Kontaktflächen (12) für jeweilige Verdrahtungsanschlüsse umfasst, an denen die Kontrastarme (11) des jeweiligen elastischen Lamelle (8) arbeitet, wobei die elastischen Lamellen (8) ferner eine Trägerplatte (14) umfassen, die einstückig mit den jeweiligen Kontrastarmen (11) ist und auf der die Kontaktflächen (12) der jeweiligen elektrischen Kontakte (5) liegen;
und dadurch, dass die Druckknöpfe (9) jeder der Klemmen (7) in dem Gehäuse (2) entlang einer jeweiligen Richtung parallel zu der Längserstreckungsachse (L) zum Übertragen auf eine entsprechende der elastischen Lamellen (8) eine ebenfalls im Wesentlichen axiale Kraft und dass jede der elastischen Lamellen
(8) mindestens ein Paar von Kontrastarmen (11) umfasst, die gegeneinander versetzt sind und ein freies Ende haben, das angepasst
ist, um auf einem entsprechenden der elektrischen Kontakte (5).
2. Elektrische Einheit nach Anspruch 1, dadurch gekennzeichnet, dass jeder der elastischen Lamellen (8) mindestens ein Paar Druckknöpfe (9) zugeordnet ist, die auf einen jeweiligen der Kontrastarme (11) wirken, um sie selektiv zu bewegen weg von einem entsprechenden der elektrischen
Kontakte (5).
3. Elektrische Einheit nach Anspruch 2, dadurch gekennzeichnet, dass jeder der elektrischen Kontakte (5) in dem Gehäuse (2) befestigt ist und ein Paar der Kontaktflächen (12) für jeweilige Verdrahtungsanschliisse umfasst, an denen ein Korrespondent der Kontrastarme
(11) der jeweiligen elastischen Lamelle (8) arbeitet, wobei die Kontaktflächen (12) gegebenenfalls gerändelt und durch einen Längsschlitz (13) quer versetzt sind.
4. Elektrische Einheit nach Anspruch 3, dadurch gekennzeichnet, dass jede der Trägerplatten (14) eine erste zentrale Öffnung (15) aufweist, die sich an dem Längsschlitz (13) befindet.
5. Elektrische Einheit nach Anspruch 4, dadurch gekennzeichnet, dass jeder der Druckknöpfe (9) ein U-Profil mit einem Paar von Schubarmen (20) hat, deren freie Enden so angeordnet sind, dass sie auf jeweilige Kontrastarme (11) von wirken die elastischen Lamellen (8).
6. Elektrische Einheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Gehäuse (2) eine Bodenwand aufweist, die mit einem Paar axialer Löcher (32) versehen ist, die mit den elastischen Lamellen (8) zum Prüfen des elektrischen Durchgangs in Verbindung stehen.
7. Elektrische Einheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Gehäuse (2) Verankerungsmittel (21) aufweist, die einer zwischen seiner oberen Wand (22) und seiner unteren Wand (10) und der anderen der Wände (10, 22) sind mit Haltezähnen (33) zugeordnet zum Eingriff in die Verankerungsmittel (21) einer weiteren gestapelten elektrischen Einheit (1) versehen ist.
8. Elektrische Einheit nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Gehäuse (2) einen Aktuator (3) mit einem Schieber (23) mit einem Ende (24) aufnimmt, das an eine externe Steuerung angeschlossen werden kann und mit mindestens
ein Paar beweglicher elektrischer Kontakte (4), die mit entsprechenden festen elektrischen Kontakten (5) in Kontakt gebracht werden können.
9. Elektrische Einheit nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Gehäuse (2) eine LED-Schaltung (26) mit einer elektrisch mit den elektrischen Kontakten (5) verbundenen PCB (27) und einer LED-Diode (28) enthält.
10. Elektrische Einheit nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass jede der elastischen Lamellen (8) ein Paar Verbindungselemente (16) zum Verbinden der Trägerplatte (14) mit den Kontrastarmen (11) umfasst Elemente (16), die gegeneinander versetzt sind, um eine zweite Öffnung (17) zu definieren, wobei die elektrischen Kontakte (5) eine L-förmige Formation (18) aufweisen, die sich durch die zweite Öffnung (17) erstreckt, um mit dem beweglichen zusammenzuwirken.
1. Unité électrique à contact ou à DEL pour circuits de commande électrique de machines
ou d'installations industrielles, dans laquelle un circuit électrique comprend une
ou plusieurs bornes de câblage, laquelle unité comprend:
- un boîtier (2) logeant à l'intérieur au moins une paire de contacts électriques (5) et ayant un siège définissant un axe d'extension longitudinal (L) ;
- un actionneur (3) ou un circuit LED (26) logé sélectivement dans ledit boîtier (2) et connecté électriquement audit contact électrique (5);
- au moins une paire de pinces (7) pour le câblage desdits contacts électriques (5) et leur connexion à un circuit électrique, lesdites pinces de câblage (7) étant accessibles par des trous latéraux respectifs (6) dudit boîtier (2) pour l'insertion des bornes de câble de câblage et dans lequel chacune desdites pinces
(7) comprend une lamelle élastique (8) ayant un ou plusieurs bras de contraste (11) adaptés pour maintenir les bornes de câblage sur lesdits contacts électriques (5) ;
dans lequel chacune desdites pinces (7) comprend au moins un bouton-poussoir (9) inséré de manière coulissante dans ledit
boîtier (2) et adapté pour être mis en contact avec une respective desdites lamelles élastiques
(8) pour favoriser la flexion élastique de ladite des bras de contraste (11) et les éloigner de chacun desdits contacts électriques (5) pour permettre l'insertion ou le retrait de la borne de câblage correspondante;
caractérisé en ce que chaque lamelle élastique (8) est couplée au contact électrique respectif (5), chacun desdits contacts électriques (5) comprenant des surfaces de contact (12) pour des bornes de câblage respectives sur lesquelles lesdits bras de contraste (11) de l'élastique respectif la lamelle (8) fonctionne, lesdites lamelles élastiques (8) comprenant en outre une plaque de support (14) solidaire des bras de contraste respectifs (11) et sur laquelle reposent lesdites surfaces de contact (12) desdits contacts électriques respectifs (5);
et en ce que les boutons-poussoirs (9) de chacune desdites pinces (7) peuvent coulisser dans ledit boîtier (2) le long d'une direction respective parallèle audit axe d'extension longitudinale
(L) pour transmettre à l'une correspondante desdites lamelles élastiques (8) un effort également sensiblement axial et en ce que chacune desdites lamelles élastiques (8) comprend au moins une paire de bras de contraste (11) décalés l'un par rapport à l'autre et ayant une extrémité libre apte à reposer sur
un correspondant desdits contacts électriques (5).
2. Unité électrique selon la revendication 1, caractérisé en ce que chacune desdites lamelles élastiques (8) est associée à au moins une paire de boutons poussoirs (9) agissant sur un respectif desdits bras de contraste (11) pour le déplacer sélectivement à distance d'un correspondant desdits contacts électriques
(5).
3. Unité électrique selon la revendication 2, caractérisé en ce que chacun desdits contacts électriques (5) est fixé dans ledit boîtier (2) et comprend une paire desdites surfaces de contact (12) pour des bornes de câblage respectives sur lesquelles un correspondant desdits fonctionne
des bras de contraste (11) de la lamelle élastique (8) respective, lesdites surfaces de contact (12) étant éventuellement moletées et décalées transversalement par une fente longitudinale
(13).
4. Unité électrique selon la revendication 3, caractérisé en ce que chacune desdites plaques de support (14) présente une première ouverture centrale (15) située au niveau de ladite fente longitudinale (13).
5. Unité électrique selon la revendication 4, caractérisée en ce que chacun desdits boutons-poussoirs (9) a une section en U avec une paire de bras de poussée (20) ayant des extrémités libres agencées pour opérer sur des bras de contraste (11) respectifs de lesdites lamelles élastiques (8).
6. Unité électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit boîtier (2) présente une paroi de fond munie d'une paire de trous axiaux (32) communiquant avec lesdites lamelles élastiques (8) pour contrôler la continuité électrique.
7. Unité électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit boîtier (2) comporte des moyens d'ancrage (21) associés l'un entre sa paroi supérieure (22) et sa paroi inférieure (10), l'autre desdites parois (10, 22) étant pourvu de dents de retenue (33) pour engager les moyens d'ancrage (21) d'une autre unité électrique (1) empilée.
8. Unité électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit boîtier (2) abrite un actionneur (3) comportant un curseur (23) avec une extrémité (24) adaptée pour être reliée à une commande extérieure et munie d'au moins une paire
de contacts électriques mobiles (4) adaptés pour être mis en contact avec des contacts électriques fixes (5) correspondants.
9. Unité électrique selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ledit boîtier (2) abrite un circuit DEL (26) comportant un PCB (27) connecté électriquement auxdits contacts électriques (5) et une diode DEL (28).
10. Unité électrique selon la revendication 8 ou 9, caractérisé en ce que chacune desdites lamelles élastiques (8) comprend une paire d'éléments de connexion (16) pour connecter ladite plaque support (14) auxdits bras de contraste (11), ledit les éléments (16) étant décalés les uns par rapport aux autres pour définir une seconde ouverture (17), lesdits contacts électriques (5) ayant une formation en forme de L (18) s'étendant à travers ladite seconde ouverture (17) pour interagir avec lesdits contacts mobiles (4) dudit actionneur (3) ou avec ladite PCB (27) dudit circuit DEL (26).