EP3399534B1 - Assembly for mounting led and/or contact units and led units for electrical control circuits of industrial plants - Google Patents

Assembly for mounting led and/or contact units and led units for electrical control circuits of industrial plants Download PDF

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Publication number
EP3399534B1
EP3399534B1 EP18000432.7A EP18000432A EP3399534B1 EP 3399534 B1 EP3399534 B1 EP 3399534B1 EP 18000432 A EP18000432 A EP 18000432A EP 3399534 B1 EP3399534 B1 EP 3399534B1
Authority
EP
European Patent Office
Prior art keywords
casing
led
cradle
housing
diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18000432.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3399534A1 (en
Inventor
Marco Pizzato
Simone Zonta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pizzato Elettrica SRL
Original Assignee
Pizzato Elettrica SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pizzato Elettrica SRL filed Critical Pizzato Elettrica SRL
Publication of EP3399534A1 publication Critical patent/EP3399534A1/en
Application granted granted Critical
Publication of EP3399534B1 publication Critical patent/EP3399534B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/0006—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/023—Light-emitting indicators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H01H2219/042—Light emitting elements replaceable

Definitions

  • the present invention finds application in the field of devices for the control of industrial machines and plants and has for object a LED unit designed to be inserted into an electric circuit for the control of machines or industrial plants for sending light signals concerning the operation of the machine or plant.
  • the invention also relates to an assembly for mounting LED units and/or electrical contact units that can be inserted into an electrical circuit for the control of industrial machines or plants and/or for sending light signals relating concerning the operation of the machine or plant.
  • LED units has become preferable compared to conventional incandescent lamps as the former have longer life and lower power consumption, ensuring high reliability, low consumption and high resistance to vibrations.
  • an LED unit comprises a casing inside which the electrical wiring terminals are housed and wherein there is also the LED diode provided with lens and having a printed circuit connected to the terminals, usually by means of soldered pins.
  • the casing is also provided with hooking means which can be of the box or panel type, depending on whether the LED unit is to be fixed to the bottom of a junction box or directly to a panel.
  • the LED units can also be mounted together with one or more contact units housing pairs of fixed and movable contacts suitable to be wired to a corresponding control or service circuit of the machine or plant in order to switch its status as a result of the action of an actuator movable inside the casing of the contact unit and associated with a drive control.
  • their casings In order to guarantee the interchangeability between the contact units and the LED units, their casings have a substantially identical external shape, except that some parts necessary for stably housing the LED.
  • a casing A for a LED unit U provides for the presence of a collar C at the upper hole H from which the diode D will protrude, while said collar C will be absent in the casing of a contact unit.
  • a further drawback of the known LED units is related to the need to provide, outside the casing, an indication relating to the colour of the LED light which allows the operator to quickly select the LED with the desired colour during installation.
  • US2008/073190 discloses a pushbutton provided with a casing that houses thereinside an LED light positioned so as to be visible through the button and connected to a switching unit. The latter is snap-fitted with the casing and further secured with a pair of pins that are inserted into corresponding holes made in a containment body of the switching unit. The same pins are inserted into corresponding holes made in a support strip of the LED diode, so that the latter is completely contained inside the main casing of the button. Therefore, the casing of this electrical device cannot be used to realize devices having other functions, for example those typical of the electrical contact units for controlling electrical circuits associated with industrial machines or plants.
  • EP2624674 discloses an operation switch with a switch unit and an operation unit that can be separated from each other and wherein the operation unit is disposed on a front surface side of a panel and operated by external pressing force.
  • An object of the present invention is to overcome the above drawbacks by providing an LED unit for electrical control circuits of machines or industrial plants with features of high efficiency and relative cost-effectiveness.
  • a particular object is to provide an LED unit that can be assembled starting from a casing adapted to be also used for the common contact units in order to use a single mold for both types of units, with consequent economic savings and managing simplification.
  • an object of the invention is to provide a casing which can be used indifferently for the assembly of LED units or electrical contact units.
  • Still another object is to provide an LED unit which allows the colour of the light emitted by the LED to be identified simply, quickly and safely.
  • an LED unit which, according to claim 4, comprises a casing housing at least one pair of electrical contacts associated with respective wiring terminals for connection to an electric circuit, said casing having at least one pair of lateral passages for accessing said terminals, at least one LED circuit inserted into said housing and having a diode suitable for emitting the light beam and a printed circuit for electrical connection to said electrical contacts.
  • the casing comprises a housing for said at least one LED circuit provided with an upper hole and furthermore an anchoring cradle is provided which is inserted into said housing for the stable locking of said LED circuit in said casing.
  • the cradle is removably inserted to allow removal of the LED circuit.
  • the mounting of the LED unit may be carried out starting from a casing suitable to be used also for contact units which only the cradle will have to be added to.
  • the cradle will be made of plastic material having the same colour or close to that of the light beam emitted by said LED circuit and will also be provided with at least one portion visible from the outside of said casing.
  • the same cradle will give an indication of the colour of the LED light and it will not be necessary to put the sign on the bottom wall.
  • the cradle may comprise a collar with a portion snugly fit in said upper hole and within which said diode is at least partially inserted.
  • the collar will have both the diode protection function and the function of giving an immediate and clearly visible indication of the colour of the LED light, being of the same colour as the light beam.
  • the casing may comprise at least one window for partial viewing said cradle, with the latter comprising an axial plate for supporting said printed circuit in said housing and from which a pin will transversely project which will snugly fit in a window made in the bottom wall of said casing.
  • the pin having the colour indicative of the light beam colour will be arranged on the same face on which the coloured sign is usually reported, so as not to modify the operating modes of the operators and without having to perform an additional operation to add such a sign.
  • an assembly for mounting LED units or contact units for electrical control systems of machines or industrial plants which, according to claim 1, comprises a casing housing thereinside two or more fixed electrical contacts associated with respective wiring terminals for connection to an electrical circuit, said casing having a pair of lateral passages for accessing said terminals, at least one LED circuit adapted to be inserted into said casing and having a diode adapted to emit the light beam and a printed circuit for electrical connection of said diode to said electrical contacts, at least one actuator insertable in said casing and having a slider slidable in said casing and having an upper end adapted to he associated with an external control and two or more mobile electric contacts suitable to be brought into contact with corresponding electrical contacts following the translation of said slider, wherein said casing comprises a housing for selectively receiving said at least one LED circuit or said at least one actuator, said housing being provided with an upper hole for the exit of said diode or of the upper end of said slider.
  • the assembly also comprises an anchoring cradle adapted to be inserted into said housing for the stable locking of said LED circuit in said casing.
  • the cradle may only be inserted when the casing is to be used to create an LED unit, thus eliminating the problem of having to set up two different casings, and therefore two different molds, for LED units and contact units.
  • the LED unit 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.
  • Fig. 2 shows a first embodiment of the LED unit, generally indicated by 1 , provided with a casing 2 having anchoring means 3 of the bottom box-type, i.e. associated with the bottom wall 4 of the casing 2 and designed to allow the fixing of the LED unit 1 to the bottom wall of a junction box, not shown because known per se.
  • Fig. 3 shows indeed a second embodiment of the LED unit 1 which differs from the previous one essentially in that the anchoring means 3 are of the panel type, i.e. associated with the upper wall 5 of the casing 2 for anchoring to a panel or similar support for one or more LED and/or contact units and to which one or more controls may be applied.
  • the anchoring means 3 are of the panel type, i.e. associated with the upper wall 5 of the casing 2 for anchoring to a panel or similar support for one or more LED and/or contact units and to which one or more controls may be applied.
  • the LED unit 1 comprises a casing 2 housing thereinside a pair of fixed electrical contacts 6 associated with respective wiring terminals 7 for connection to an electrical circuit.
  • the casing 2 essentially consists of two parts, that is a containment body 8 , wherein the housings for the various components are formed, and a cover 9 which is removably coupled to the front face of the containment body 8 to allow the insertion of the various components during assembly.
  • the fixing of the cover 9 to the containment body ay can be obtained by means of a plurality of pins 10 projecting from the containment body 8 and insertable into corresponding holes 11 of the cover 9 , or vice versa.
  • the cover 9 may be applied removably but more preferably it will be fixed by blocking the pins 10 inside the holes 11 , for example by ultrasonic welding.
  • the fixing of the cover 9 on the containment body 8 may be carried out by similar means, for example screws or similar members, or by means of gluing or welding to make the enclosure 2 no longer openable.
  • the containment body 8 also comprises at least one pair of lateral passages 12 for inserting the wiring cables and their access to the terminals 7.
  • the LED unit 1 comprises a LED circuit 13 adapted to be inserted into the casing 2 and having a diode 14 adapted to emit the light beam and a PCB or printed circuit 15 for electrical connection of the diode 14 to the electrical contacts 6 and for managing the diode 14 , in particular the switching on, timing, adjusting of the light intensity.
  • connection mode of the printed circuit 15 with the electrical contacts 6 may vary according to the requirements and for example the printed circuit 15 will comprise soldered pins connected to the contacts 6.
  • the LED circuit 13 is designed to be inserted inside a housing 16 arranged centrally in the casing 2 and extending throughout the height of the casing 2.
  • the housing 16 has an upper hole 17 for connecting the diode 14 placed externally, while the printed circuit 15 will be placed inside the casing 2.
  • An anchoring cradle 18 is adapted to be inserted into the housing 16 for the stable locking of the LED circuit 13 inside the casing 2.
  • the cradle 18 may be inserted into the housing 16 both in a fixed manner and in a removable manner and in this second case, if the casing 2 is also openable, it will allow removal of the LED circuit 13 and its replacement, possibly together with the cradle 18 , or replacement of the cradle only 18.
  • the cradle 18 comprises a collar 19 which can be inserted above the upper hole 17 and has a lower annular projection 20 adapted to be inserted into the upper hole 17 to lock the collar 19 on the casing 2.
  • the diode 14 is designed to be inserted inside the collar 19 so as to be permanently arranged on the casing 2 and to be protected in a manner similar to that required for the LED units according to the state of the art.
  • the collar 19 also comprises one or more axial slots 21 for the passage of the filaments 22 for the electrical connection of the diode 14 to the printed circuit 15.
  • axial refers to the main development direction of the cylindrical housing 16.
  • the cradle 18 comprises an axial plate 23 for supporting the printed circuit 15 inside the housing 16 and having means for the stable but removable fixing of the printed circuit 15 .
  • the printed circuit 15 may be snap-coupled to the plate 23 , with the latter comprising a pair of upper ribs 24 and lower ribs 25 which will delimit a seat having a height corresponding to the axial dimension of the printed circuit 15.
  • the cradle 18 will be made of a sufficiently rigid material but having such flexibility as to allow snap coupling with the printed circuit 15.
  • the printed circuit 15 may simply be placed on the plate 23 and held in position due to the connection with the diode 14.
  • the housing 16 will comprise an axial groove 26 in which the plate 23 will be inserted.
  • the cradle 18 will be made of plastic material having the same colour or a colour close to that of the light beam emitted by the diode 14 , so as to give an immediate indication of the colour of the emitted light already during the selection and assembly of the LED unit 1.
  • the cradle 18 may have at least one portion protruding from the casing 2 or otherwise visible from the outside even when the casing 2 is completely assembled to give immediate evidence of the colour of the light beam.
  • the casing 2 comprises at least one window for partial viewing of the cradle 18 , so as to allow to immediately know the colour and consequently also know the colour of the LED light.
  • the window is defined by a hole 27 formed in the bottom wall 4 of the casing 2 in correspondence with the housing 16 and has such a size as to snugly fit a fin 28 projecting transversely from the lower end of the plate 23.
  • Fig. 5 shows the LED unit 1 in a particular variant and in an assembled condition but without the cover 9 to allow viewing thereinside.
  • the electrical contacts 6 are constituted by shaped metal plates associated with terminals 7 of the spring type, that is constituted by one or more shaped elastic lamellae on which corresponding push-buttons 29 can be operated from the outside to allow insertion or removal of the wiring terminal.
  • the anchoring means 3 are of the panel type and therefore associated with the upper wall 5 of the casing 2.
  • Fig. 6 shows a variant of the previous LED unit 1 which differs from this essentially in that the anchoring means 3 are of the box-like type and therefore associated with the bottom wall 4 of the casing 2.
  • the spring-loaded terminals 7 may be replaced with clamps of conventional type, in particular of the screw type, without departing from the scope of protection of the present invention.
  • FIG. 7 shows a further embodiment of the LED unit 1 which differs from the previous ones essentially in that the terminals 7 are of the screw type.
  • anchoring means 3 are of the panel type.
  • the casing 2 will be substantially similar to the configuration with terminals 7 of the spring type unless minor modifications needed to adapt it to the different shape of the terminals 7.
  • Fig. 9 shows a further variant of the LED unit 1 with screw terminals 7 wherein the anchoring means 3 are of the bottom box-type.
  • Fig. 10 shows a fourth embodiment of the LED unit 1 , which differs in that it has an LED circuit 13 of the SMT ( Surface-Mount Technology ) type.
  • the LED diode 14 is mounted on the printed circuit 15 to be completely contained in the casing 2 and flush with the upper hole 17 , as can be seen more clearly from Fig. 11 .
  • the diode 14 will emit the light beam in a direction parallel to the plane defined by the printed circuit 15 so as to exit from the upper hole 17.
  • the anchoring cradle 18 will be free of the collar 19 and provided only with the annular projection 20 which can be inserted into the upper hole 17 and having the axial slot 21 for the passage of the light beam.
  • the LED unit 1 has spring-loaded terminals 7 even if in a not shown variant the terminals 7 may be of the screw type.
  • anchoring means 3 are of the panel type but may also be of the bottom box-type.
  • Figs. 12 and 13 show yet another embodiment of the LED unit 1 also having in this case a LED circuit 13 of the SMT type in which the LED diode 14 is housed inside a collar 19 integral with the anchoring cradle 18 and protruding externally from the upper hole 17. Also in this case the spring terminals 7 may be replaced by screw terminals, as well as the panel type anchoring means 3 may be replaced by bottom box-type one.
  • Fig. 14 shows a contact unit 30 provided with a casing 2 which can be used for the assembly of the LED unit 1 according to the invention.
  • the casing 2 will house, in place of the LED circuit 13 , a known type of actuator 31 having a slider 32 slidable in the casing 2 and with an upper end 33 adapted to be associated with an external control, not illustrated since known per se.
  • the slider 32 is integral with two movable electric contacts 34 adapted to be brought into contact with corresponding fixed electrical contacts 6 present in the casing 2 upon the translation of the slider 32.
  • the anchoring cradle 18 is not present and will be arranged only when it will be necessary to arrange the LED circuit 13 instead of the actuator 31.
  • Fig. 15 shows a variant of the previous contact unit 30 which differs in that it has spring terminals 7 in place of the screw terminals of the previous embodiment.
  • the lower hole 27 may be used, when the unit is configured as contact unit 30 , to connect multiple contact units in cascade, i.e. with the respective actuators 31 arranged in column and connected to each other through the respective lower holes 27 and with a single actuator 31 , the upper one, connected directly to a button or other control device so that the actuation of the button or device operates substantially all the actuators 31 simultaneously.
  • the LED unit and the assembly according to the invention achieve the intended objects and in particular that of allow to use a single casing, and therefore a single mold, both to mounting an LED unit and a contact unit.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Led Device Packages (AREA)
EP18000432.7A 2017-05-05 2018-05-07 Assembly for mounting led and/or contact units and led units for electrical control circuits of industrial plants Active EP3399534B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000049137A IT201700049137A1 (it) 2017-05-05 2017-05-05 Unita’ led per circuiti elettrici di controllo di impianti industriali

Publications (2)

Publication Number Publication Date
EP3399534A1 EP3399534A1 (en) 2018-11-07
EP3399534B1 true EP3399534B1 (en) 2020-11-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18000432.7A Active EP3399534B1 (en) 2017-05-05 2018-05-07 Assembly for mounting led and/or contact units and led units for electrical control circuits of industrial plants

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EP (1) EP3399534B1 (it)
IT (1) IT201700049137A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111328239A (zh) * 2020-03-18 2020-06-23 安徽国耀通信科技有限公司 一种可一体式更换外壳的通讯机柜

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE488850T1 (de) * 2004-10-15 2010-12-15 Gamesman Ltd Druckknopfanordnung
DE202007005373U1 (de) * 2007-04-12 2008-08-21 Weidmüller Interface GmbH & Co. KG Reihenklemmensystem
JP6007498B2 (ja) * 2012-01-31 2016-10-12 オムロン株式会社 操作スイッチ
EP2669919A1 (de) * 2012-05-29 2013-12-04 Siemens Aktiengesellschaft Elektromechanische Betätigungseinrichtung

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* Cited by examiner, † Cited by third party
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Publication number Publication date
EP3399534A1 (en) 2018-11-07
IT201700049137A1 (it) 2018-11-05

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