EP2600368B1 - Double contacts control unit for electric plants and electric control device comprising the unit - Google Patents

Double contacts control unit for electric plants and electric control device comprising the unit Download PDF

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Publication number
EP2600368B1
EP2600368B1 EP12007819.1A EP12007819A EP2600368B1 EP 2600368 B1 EP2600368 B1 EP 2600368B1 EP 12007819 A EP12007819 A EP 12007819A EP 2600368 B1 EP2600368 B1 EP 2600368B1
Authority
EP
European Patent Office
Prior art keywords
pairs
control unit
fixed contacts
support
electric
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
EP12007819.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2600368A1 (en
Inventor
Marco Pizzato
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
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Application filed by Pizzato Elettrica SRL filed Critical Pizzato Elettrica SRL
Publication of EP2600368A1 publication Critical patent/EP2600368A1/en
Application granted granted Critical
Publication of EP2600368B1 publication Critical patent/EP2600368B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5855—Electric connections to or between contacts; Terminals characterised by the use of a wire clamping screw or nut
    • 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
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/506—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member with a make-break action in a single operation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2025—Bridging contacts comprising two-parallel bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/56—Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing
    • 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
    • H01H13/04—Cases; Covers
    • 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
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/52—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state immediately upon removal of operating force, e.g. bell-push switch

Definitions

  • the present invention generally finds application in the field of electric control devices and particularly relates to a double-contact control unit for electric plants.
  • the invention further relates to an electric control device comprising such control unit.
  • control units with movable contacts are known in the art, which are adapted to be connected to electric plants, namely to control starting and stopping of safety devices, such as warning, alarm or emergency devices.
  • control units known as single contact units, which essentially operate as switches, comprise an insulating support which is designed to be housed in an electrical protection box, which is adapted to be anchored to a fixed or movable part of a plant.
  • Two pairs of mutually movable electric contacts are housed in the support, the first pair being generally fixed and connected to the terminals of an electric circuit to be switched, the second pair being attached to an actuator that causes it to move toward/away from the first pair.
  • the support has a pair of projections designed for snap-fitting into a seat that is specially formed in the bottom wall of the electrical box.
  • control unit may be designed for simultaneous management of multiple electric circuits connected to different devices of the plant, e.g. to trigger a safety circuit at the same time as the main circuit is opened.
  • two pairs of movable contacts are provided in the support, and are adapted to selectively interact with respective pairs of fixed contacts, and in this case the control unit is generally referred to as "double-contact" type.
  • double-contact control units generally have a significantly larger axial dimension than single-contact control units, and require the provision of relatively bulky electrical boxes.
  • control unit is anchored to a fixed part of the plant by coupling elements designed for snap engagement of corresponding seats of a fastening bracket or panel.
  • WO90/01784 discloses a switch device having an enclosure containing two microswitches located on opposite sides and in symmetric positions with respect to the actuation axis of an actuator.
  • Document DE 102005033166 discloses a device according to the preamble of claim 1.
  • the object of the present invention is to overcome the above drawbacks, by providing a double-contact control unit that achieves high efficiency and relative cost effectiveness.
  • a particular object is to provide a double-contact type control unit that has substantially the same axial dimension as a single-contact pair type control unit.
  • a further object of the present invention is to provide a double-contact control unit for electric plants that can be installed in modular fashion in an electrical box.
  • Yet another object is to provide a control device for electric plants that allows one or more double-contact control units to be inserted in an electrical box typically sized to contain single-contact control units.
  • a double-contact control unit for electric plants as claimed in claim 1, which is designed to be anchored to a fixed or movable support element of an electric plant, wherein the control unit comprises an insulating support having a longitudinal axis and a predetermined axial length, two pairs of fixed contacts mounted to said support in longitudinally offset positions and adapted to be connected to corresponding electric circuits associated with the plant to cooperate with respective pairs of movable contacts for opening/closing said electric circuits, each of said fixed contacts being associated with a respective electrical connection terminal, wherein the terminals of each of said pairs of fixed contacts are located in symmetric positions with respect to said longitudinal axis, at distances and inclination angles differing from those of the terminals of the other of said pairs of fixed contacts and at least partially transversely aligned therewith.
  • the length of the support is reduced and substantially compatible with that of common single-contact pair control units, possibly allowing accommodation in an electrical box typically formed to contain single-contact pair control units.
  • a control device is provided, as set forth in claim 8, which comprises an electrical box and one or more double-contact control units of the present invention.
  • a control unit of the invention may be mounted to one or more electric circuit of an electric plant, not shown in the accompanying drawings and known per se, to control opening and closing thereof in a selective and controlled manner.
  • control unit 1 may be simultaneously connected to a main power supply circuit for powering a movable part of the plant and to an auxiliary safety circuit, such as a warning, emergency or alarm circuit, to trigger the latter at the same time as the main circuit is opened, thereby ensuring the requested safety.
  • auxiliary safety circuit such as a warning, emergency or alarm circuit
  • control unit 1 may be connected to the stationary part of the electric plant through a support element, such as an electrical box 2 or an anchor panel 3.
  • a double-contact control unit 1 of the invention comprises an insulation support 4 which is adapted to be removably anchored to a particular support element 2, 3 and has a longitudinal axis L and a predetermined axial length 1.
  • First and second pairs of fixed electric contacts, 5, 5' and 6, 6', are arranged in the insulation support 4, and are associated with respective electric terminals 7, 7'; 8, 8' through respective substantially transverse conductive plates 9, 9'; 10, 10' for electric connection to respective electric circuits of the plant.
  • each terminal 7, 7'; 8, 8' is accommodated in a respective seat 11, 11'; 12, 12', which is formed in the support 4 and has a substantially elongate shape in a main direction of extension X, X'; Y, Y'.
  • the support 4 also houses first and second pairs of movable electric contacts, 12, 12' and 14, 14' which are spaced at a predetermined maximum axial distance d and are adapted to be selectively moved to contact with the fixed contacts 5, 5'; 6, 6' of a respective pair, in any manner known to the skilled person.
  • the terminals 7, 7' of one of the pairs of fixed contacts 5, 5' are located in symmetric positions with respect to the longitudinal axis L, at distances and inclination angles a differing from those of the terminals 8, 8' of the other pair of fixed contacts 6, 6' to be at least partially transversely aligned therewith to reduce the longitudinal offset of the pairs of fixed contacts 5, 5'; 6, 6' and the axial length 1 of the support 4.
  • the plates 9, 9' of the pair associated with one of the pairs of fixed contacts 5, 5' have a transverse dimension w that is larger than the transverse dimension z of the plates 10, 10' of the other pair, such that their respective terminals 7, 7' may be arranged at a longer distance from the longitudinal axis L, as compared with the other pair of terminals 8, 8'.
  • the housing seats 11, 11' of the electric terminals 7, 7' associated with the conductive plates 9, 9 having the larger transverse dimension w have respective directions of extension inclined to the longitudinal axis L.
  • housing seats 11, 11' are at least partially transversely aligned with the seats 12, 12' of the terminals 8, 8' connected to the other pair of fixed contacts 6, 6'.
  • This particular configuration will reduce the longitudinal offset of the pairs of fixed contacts 5, 5'; 6, 6' and, as a result, the maximum axial distance d between the pairs of movable contacts 13, 13'; 14. 14' to obtain a support 4 having a relatively small length 1, substantially comparable to the length of the insulation supports that are typically used for the control units having a single pair of movable contacts, thereby allowing them to be accommodated in an electrical box 2.
  • the support 4 substantially has a box-like shape and is symmetric with respect to the longitudinal axis L, with an upper front face 15 and a lower front face 16, which are substantially flat, opposed and parallel to each other.
  • one of such front faces 15, 16 is equipped with snap anchor means 17 which are adapted to be removably connected to respective seats, appropriately formed in the support element 2, 3 as described below.
  • the anchor means 17 may be associated with the upper face 15.
  • the control unit 1 is designed to be anchored to a fixation panel 3, as shown in Figs. 10 and 11 , described below in greater detail.
  • control unit 1 is more compact and has lower space requirements.
  • Figs. 3 and 4 show a control unit 1 having the anchor means 17 associated with the lower face 16 of the support 4 for removable anchorage of the bottom wall of an electrical box 3, as shown in Figs. 6 to 9 , also described in greater detail below.
  • the snap anchor means 17 may include a pair of coupling elements 18, 19 moving along the same transverse axis Z in opposite directions.
  • each coupling element 18, 19 slides transversely against a respective return spring 20, 21 or the like, housed in the support 4 and adapted to force the corresponding coupling element 18, 19 toward the closed position.
  • the seats 11, 11'; 12, 12' for the terminals 7, 7'; 8, 8' may have respective holes 22, 22'; 23, 23' for access to respective terminals 7, 7'; 8, 8'.
  • Such access holes 22, 22'; 23, 23' are formed in the support 4 at the front face 15, 16 with no anchor means 17, to facilitate insertion of a tool, such as a screwdriver or the like, for tightening or removing the corresponding terminal 7, 7'; 8, 8'.
  • the conductive plates 9, 9' with the larger transverse dimension w have first end portions 24, 24' equipped with respective fixed contacts 5. 5' and second end portions 25, 25' equipped with respective terminals 7, 7'.
  • the second end portions 25, 25' are appropriately inclined to the longitudinal axis L at equal and opposite inclination angles for the respective terminals 7, 7' to be arranged substantially parallel to the directions of extension X, x' of the corresponding housing seats 11, 11'.
  • the seats 11, 11' for the terminals 7, 7' can be easily accessed by an operator using an appropriate tool, although the support 4 is very compact, in both longitudinal and transverse directions.
  • the inclination angle of the second end portions 25, 25' of the conductive plates 9, 9' may range from 10° to 85°, more preferably from 60° to 80°.
  • the inclination angle ⁇ of the terminals 7, 7' is complementary to the inclination angle of the second end portions 25, 25'.
  • the conductive plates 9, 9' having the larger transverse dimension w may be appropriately shaped with a first end portion 24, 24' substantially transverse and orthogonal to the longitudinal axis L and a substantially longitudinal intermediate portion connecting the two end portions 24, 25; 24', 25'.
  • the second end portion 25, 25' may also have a substantially transverse section that connects the inclined section to the intermediate portion.
  • the conductive plates 10, 10' having the smaller transverse dimension z are appropriately shaped with end portions substantially transverse and orthogonal to the longitudinal axis L and a substantially longitudinal intermediate portion connecting the two end portions.
  • This configuration will allow the terminals 7, 7'; 8, 8' to be accommodated in the support 4 such that the latter may still have a compact size while allowing simple access to the former as the access holes 22, 22'; 23, 23' are transversely offset from each other.
  • control unit 1 comprises substantially longitudinal actuating means 27 associated with the first and the second pairs of movable electric contacts 13, 13'; 14, 14', to move the latter along a substantially longitudinal common actuation axis, e.g. coincident with the axis of symmetry L.
  • This particular configuration allows use of actuator means having a high degree of safety, complying with the standards in force.
  • the actuating means 27 may be known per se and include, by way of example, a slider 28 sliding in a longitudinal guide 29 formed at the center of the support 4.
  • the slider 28 has an upper end 30 adapted to interact with a pushbutton for actuating the control device to which the unit 1 is mounted, e.g. the emergency mushroom pushbutton 31 as shown in Fig 6 .
  • the lower end 32 of the slider 28 is associated with a pair of bridges 33, 34, each having one of the pairs of movable contacts 13, 13'; 14, 14'.
  • the two contact-holding bridges 33, 34 are housed in a cavity 35 formed in the slider 28 ad the lower bridge 34 connected to the second pair of movable contacts 14, 14' is integrated with the lower end 32 of the slider 28 to translate integral therewith.
  • the slider 28 is designed to only engage the upper bridge 33 once it has covered a first length of its maximum longitudinal stroke.
  • Fig. 5 shows a further configuration of a control unit 1 of the invention, in which one of the fixed contacts 50 of one of the pairs is stably electrically connected to one of the fixed contacts 6' of the other pair, e.g. by a connecting bridge 52 for electrical connection of the two corresponding bridges 7', 8', to define a self-monitored contact unit 1, which is designed to electrically warn, by opening the circuit, that the actuating pushbutton 31 has moved away from the contact unit 1, e.g. in case of improper mounting, or improper assembly of the box 2.
  • Fig. 5 also shows an operating sequence for said self-monitored control unit 1, indicating that, once a first length of the longitudinal stroke of the slider 28 has been covered, the second pair of movable contacts 14, 14' is only caused to move, whereas the first pair of movable contacts 13, 13' remains in contact with the corresponding first pair of fixed contacts 5, 5'.
  • the slider 28 After contact of the second pair of movable contacts 14, 14' with the second pair of fixed contacts 6, 6', the slider 28 will engage the upper bridge 33 to pull it along the longitudinal actuation axis L and cause the corresponding circuit to open.
  • Fig. 6 shows a first configuration of a control device for electric plants as disclosed by the invention, generally referenced 38, which comprises the control unit 1 as described above and shown in Figs. 3 and 4 .
  • the device 38 comprises an electrical box 2 having an inner housing 39 of predetermined height h which is adapted to accommodate one or more control units 1.
  • the electrical box 2 is composed of an upper half-shell 40 and a lower half-shell 41, which are designed to be connected together, e.g. by screw means 42.
  • the inner housing 39 has an upper wall 43 with one or more passages 44 formed therein to receive respective control pushbuttons, such as an emergency mushroom pushbutton 31, actuating pushbuttons, selectors or the like, and a bottom wall 45 configured for removable anchorage of one or more control units 1 to be associated with respective control pushbuttons.
  • control pushbuttons such as an emergency mushroom pushbutton 31, actuating pushbuttons, selectors or the like
  • bottom wall 45 configured for removable anchorage of one or more control units 1 to be associated with respective control pushbuttons.
  • the axial length 1 of the support 4 of the control unit 1 is substantially similar or slightly smaller than the height h of the inner housing 39, as more clearly shown in Fig. 7 , thereby allowing insertion of the control unit 1 of the invention having two pairs of movable contacts 13, 13'; 14, 14' into the electrical box 2.
  • the support 4 is equipped with a pair of connection elements 18, 19 as described above at its lower front face 16, to allow removable coupling with the bottom wall 45 of the housing 39.
  • the latter in turn comprises at least one pair of holding members 46, 47, adapted for snap engagement by respective coupling elements 18, 19 of the support 4.
  • the bottom wall 45 may have a plurality of pairs of holding members 46, 47, which are adapted to be selectively and modularly engaged by corresponding coupling elements 18, 19 of one or more respective control units 1, 1', 1".
  • control units 1, 1', 1" adapted to be inserted into a common electrical box 2 may also differ from each other, e.g. be all according the present invention as shown in Fig. 7 .
  • one or more single-contact pair control units 1"' may be provided in addition to one or more control units 1 of the present invention, as shown in Fig. 8 .
  • Fig. 9 shows a further configuration for the electrical box 2, designed for use in common control pushbutton panels.
  • FIGs. 10 and 11 shows a further variant of the control device of the invention, generally referenced 49, having a control unit 1 as shown in Figs. 1 and 2 , i.e. having the anchor means 17 associated with the upper front face 15.
  • the device 48 will comprise a support element defined by a fastening panel 4 having both a central passage 49 for receiving a control pushbutton, e.g. an emergency mushroom pushbutton 50, and one or more seats 51 for mounting and removable anchorage of corresponding control units 1, 1"', not necessarily all according to the present invention.
  • a control pushbutton e.g. an emergency mushroom pushbutton 50
  • seats 51 are appropriately arranged at the periphery of the central passage 49.
  • the invention fulfills the intended objects and particularly meets the requirement of providing a double-contact control unit for electric plants, e.g. of the type having two pairs of movable contacts and two pairs of fixed contacts, that is particularly compact, allowing insertion thereof into standard electrical boxes, as typically used with control units having single pairs of fixed and movable contacts.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Push-Button Switches (AREA)
  • Mechanical Control Devices (AREA)
EP12007819.1A 2011-11-30 2012-11-20 Double contacts control unit for electric plants and electric control device comprising the unit Active EP2600368B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000311A ITVI20110311A1 (it) 2011-11-30 2011-11-30 Unita' di comando a contatti doppi per impianti elettrici e dispositivo di comando elettrico comprendente tale unita'

Publications (2)

Publication Number Publication Date
EP2600368A1 EP2600368A1 (en) 2013-06-05
EP2600368B1 true EP2600368B1 (en) 2015-01-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12007819.1A Active EP2600368B1 (en) 2011-11-30 2012-11-20 Double contacts control unit for electric plants and electric control device comprising the unit

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EP (1) EP2600368B1 (it)
IT (1) ITVI20110311A1 (it)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105340040B (zh) * 2013-06-20 2017-07-14 伊顿电气Ip两合公司 具有监控功能的压力操纵的安全开关
CN104412349B (zh) * 2013-07-02 2018-01-23 皮扎托电气有限公司 用于电力设施的开关控制设备
PL3084793T3 (pl) 2013-12-19 2018-10-31 Eaton Intelligent Power Limited Element stykowy
US10014602B2 (en) * 2014-06-30 2018-07-03 Pizzato Elettrica S.R.L. Adapter for mounting electric units
CN117542678B (zh) * 2024-01-08 2024-05-03 国网河南省电力公司新乡供电公司 一种双电源切换开关装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2582360B1 (fr) * 1985-05-22 1989-05-12 Baco Sa Const Elect Anc Baumga Piece d'accouplement lateral
US5213205A (en) * 1988-08-11 1993-05-25 Pittway Corporation Switch enclosure
DE102005033166B4 (de) * 2005-07-13 2015-11-05 Georg Schlegel Gmbh & Co. Kg Schaltapparat mit wenigstens einem Schaltstößel

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Publication number Publication date
EP2600368A1 (en) 2013-06-05
ITVI20110311A1 (it) 2013-05-31

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