EP2362402A1 - Interrupteur de fin de course - Google Patents

Interrupteur de fin de course Download PDF

Info

Publication number
EP2362402A1
EP2362402A1 EP11001531A EP11001531A EP2362402A1 EP 2362402 A1 EP2362402 A1 EP 2362402A1 EP 11001531 A EP11001531 A EP 11001531A EP 11001531 A EP11001531 A EP 11001531A EP 2362402 A1 EP2362402 A1 EP 2362402A1
Authority
EP
European Patent Office
Prior art keywords
adjustment
switch
plant
case
along
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.)
Granted
Application number
EP11001531A
Other languages
German (de)
English (en)
Other versions
EP2362402B1 (fr
Inventor
Marco Pizzato
Giuseppe 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
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 EP2362402A1 publication Critical patent/EP2362402A1/fr
Application granted granted Critical
Publication of EP2362402B1 publication Critical patent/EP2362402B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
    • H01H3/161—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift for actuation by moving a closing member, e.g. door, cover or lid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/0207—Adjustable mounting of casings

Definitions

  • the present invention is generally applicable to the technical field of electrical devices for controlling a movement and/or transport plant, and specifically has as object a position or safety switch for opening and closing an electric circuit of the plant once a predetermined final position has been reached.
  • position switches are electric devices intended to be installed in a plant, e.g. a movement and/or transport plant, such as elevators, hoists or the like, in order to stop a movable part after such part has attained a final or stop position.
  • position switches also defined limit or proximity switches, have a box-like cover or frame inside of which at least one pair of electric contacts is arranged, such contacts connected to the power supply circuit of the movable part to be controlled.
  • switches can also have additional functions, e.g. they can be used as safety switches for activating a signal or emergency circuit, or for activating or closing any other electric circuit connected to the plant.
  • the switch also comprises actuator means of the electric contacts with an actuation head connected to the electric contacts via mechanical, electric, magnetic or similar means.
  • the switch is generally fixed by means of its box-like cover to a fixed part of the plant, at the predetermined stop position.
  • the actuation head can interact with the movable part of the plant when the latter reaches the stop position, in order to be activated and consequently be able to operate on the electric contacts in a manner so as to open or close the circuit.
  • the switch causes the opening of the power supply circuit of the movable part of the plant, in order to stop it in a predetermined position.
  • the cover is in turn provided with one or more through holes in order to allow the passage of screws suitable for anchoring it to the bracket.
  • a similar solution is known from US4916265 and from DE3140459 , for example.
  • the head comprises a portion for anchoring to the cover and a push button having a fixed part associated with the anchorage portion and a movable part slidable on the fixed part.
  • the correct positioning of the actuator is realized by adjusting the position of the slidable part on the fixed part.
  • the object of the present invention is to overcome the abovementioned drawbacks by realizing a position switch for movement or transport plants, in particular elevators, hoists or the like, which has high efficiency and is relatively inexpensive.
  • a particular object is to realize a position switch which is easily adjustable and which ensures an extremely fine adjustment precision
  • a particular object is to realize a position switch which maintains a precise adjustment even after a relatively high number of use cycles.
  • Still another object is to realize a position switch which has a relatively simplified configuration.
  • Still another object is to realize a position switch which can be adjusted in a simple manner, regardless of the type of actuator means installed.
  • a position switch in accordance with claim 1 comprising a box-like case or cover anchorable to the fixed part of a plant at the end position of the movable part and housing therein at least one pair of reciprocally movable electric contacts connectable to a circuit of the plant, actuator means mounted into said case and operatively associated with said electric contacts, said actuator means being designed for interacting with the movable part of the plant as this latter reaches the end position and to cause in turn the reciprocal movement of said contacts for opening/closing the electric circuit, means for adjusting the position of said actuator means with respect to said fixed part of the plant.
  • the switch is characterized in that the adjustment means are integrated into said box-like case in order to cause the translation thereof integrally with said actuator means and to allow the precise adjustment of the position of said actuator means with respect to the fixed part of the plant.
  • the adjustment means comprise a first adjustment member having a first portion anchorable to the fixed part of the plant and a second portion inside said case and slidable along a predetermined first adjustment direction.
  • the adjustment means can comprise a second adjustment member, movable in said case along a second adjustment direction, said second member being designed for being driven from the outside along said second direction and interacting with said first member in order to cause the sliding thereof along said first direction.
  • the switch according to the invention will only have to be adjusted along the adjustment direction.
  • a position switch according to the invention can be used in movement or transport plants, e.g. elevators, hoists and the like.
  • a switch according to the invention can also be used in all machines and plants, of civilian and industrial type, in which it is necessary to control the movement of one or more movable parts of the same, in order to stop the travel thereof once a predetermined end position has been reached.
  • a switch according to the invention can also be used as a safety switch in order to activate or close a signal and/or emergency circuit when the movable part reaches a pre-established position.
  • a further possible use can be, for example, when it is necessary to activate or block a second movable part when the first movable part reaches the predetermined end position.
  • a plant adapted to be served by a switch will comprise a fixed part F and at least one movable part, not illustrated in the figures, adapted to be moved between at least one start position and at least one end position.
  • fixed part F it is intended a part that is stationary with respect to the switch, but which can in any case also be movable with respect to a further reference.
  • the end position can be a stop position for the movable part or even an intermediate position during the travel thereof.
  • a switch according to the invention will comprise a box-like case or cover 2 anchorable to the fixed part F of the plant at the end position of the movable part.
  • the case 2 in a known manner, will house therein at least one pair of reciprocally movable electric contacts connectable to an electric circuit of the plant, not illustrated since this is known.
  • case 2 can also house more than one pair of electric contacts and that the switch 1 can also be connected to multiple movable parts of a plant in order to stop the motion thereof, and/or to auxiliary circuits - service, emergency and the like - of the same plant.
  • the switch 1 will also comprise actuator means 3 mounted on the case 2 and operatively associated with the electric contacts.
  • the actuator means 3 will be configured for interacting with the movable part of the plant when the latter reaches the end or stop position, in order to cause the reciprocal movement of the contacts, which can be a moving-closer or moving-away movement, and the consequent opening/closing of the circuit.
  • the actuator means 3 generally comprise an actuation head 5 mounted on the case 2. Also illustrated in Fig. 3 are several possible embodiments of actuation heads 5 susceptible to being applied to a case 2.
  • the head 5 can have different configurations and will typically comprise a fixed anchorage portion 6, adapted to be removably but stably anchored to the case 2 or integral with the same, and a movable push button 7, e.g. movable via translation, rotation or rotation-translation, susceptible to being moved following the interaction with the movable part of the plant according to known modes.
  • the movement of the push button 7 will produce the consequent movement of a transmission 8 placed inside the head 5, which will be susceptible to translate along a predetermined actuation direction X in order to interact with the contacts and determine the opening/closing movement of the circuit connected thereto.
  • the actuation head 5 can be mounted integrally with the case 2, so as to define a single unit, as in the example of Fig. 1 , or removably, as in the examples of Fig. 3 and Fig. 4 .
  • the head 5 will be rigidly coupled to the case 2, in the sense that the position of its fixed portion 6 will be univocally determined upon mounting without it could be moved along the actuation direction X to adjust its position with respect to the end position of the movable part of the plant.
  • the switch 1 will instead comprise adjustment means 9 for adjusting the position of the actuator means 3 that, according to a particular feature of the invention, will be integrated in the box-like case 2.
  • the adjustment means 9 will cause the translation of the case 2 integrally with the actuator means 3.
  • the adjustment means 9 will comprise a first adjustment member 10 having a first portion 10' anchorable to the fixed part F of the plant and a second portion 10" inside the case 2.
  • the first portion 10' of the first adjustment member 10 can be defined by a male member projecting from the case 2 and designed to be inserted in a corresponding female member H suitably provided for on the fixed part F of the plant.
  • the first adjustment member 10 can be provided with a female member suitable for being engaged by a male member of the fixed part F.
  • the second portion 10" of the first adjustment member 10 will be integral with the first anchorage portion 10' and slidable along a first predetermined adjustment direction Y.
  • the first adjustment direction Y will be substantially parallel to the actuation direction X defined by the actuator means 3, to simplify the entire adjustment operation.
  • the adjustment means 9 will comprise a second adjustment member 11 that is movable in the case 2 along a second adjustment direction Z.
  • the second adjustment member 11 will be designed to be driven from the outside along the second direction Z and to interact with the first member 10 to cause the sliding thereof along the first direction Y.
  • the first Y and the second Z adjustment directions are substantially orthogonal to each other. It is understood that they can have any mutual angle. Nevertheless, the orthogonality of the two directions Y, Z will allow having a direct interaction between the first 10 and the second 11 adjustment members, simplifying the switch 1 structurally.
  • the interface means 12 will comprise a shaped member 13 having a first section in contact with the first adjustment member 10 and a second section facing the second member 11.
  • the shaped member 13 will be integral with the first adjustment member 10.
  • the second section will have a face 14 arranged at the second adjustment member 11, such face advantageously configured as an inclined plane,
  • the inclination ⁇ of the face 14 can have any value, without limitation, and can be selected as a function of the overall size.
  • the shaped member 13 with the inclined face 14 can also be substituted by other elements suitable for transforming the movement of the second adjustment member 11 along the second direction Z into the movement of the first member 10 along the first direction Y.
  • it can be a cam or similar member.
  • the movements of the first 10 and second 11 adjustment members can also be complex movements, not mere translation, but they will preferably always have a component directed along the respective adjustment directions Y, Z.
  • the second adjustment member 11 will be preferably elongated, with main extension axis substantially coinciding with the second adjustment direction Z, or in any case parallel thereto.
  • first axial end 15 engageable by an operator in order to cause the translation of the second member 11 along the second direction Z.
  • the second axial end 16 of the second member 11 will instead be susceptible to interact with the first adjustment member 10 in order to cause in turn the translation t 1 thereof along the first direction Y.
  • the second end 16 of the second adjustment member 11 can be placed in contact with the inclined face 14 in order to press on the same and exert a force F 1 directed along the second adjustment direction Z.
  • the second adjustment member 11 can be constituted by a screw having a thread with a predetermined pitch, housed in a cavity 17 realized in the case 2.
  • the cavity 17 will consequently have a counter-threaded inner side surface 18.
  • the pitch of the thread of the screw 11 and of the counter-threaded wall of the cavity 17 will preferably be considerably reduced in order to allow an extremely precise adjustment.
  • second adjustment member 11 The use of a screw or the like as second adjustment member 11 will also allow using a common screwdriver for adjusting the position of the case 2 and hence of the actuation head 5.
  • the adjustment means 9 will also comprise a biasing member 19 acting against the first adjustment member 10 along a predetermined axis A in order to exert an opposing force F 2 on such member.
  • Such force F 2 will be substantially parallel to the first direction Y and will have opposite sense with respect to the translation t 1 of the first member 10.
  • both the biasing member 19 and the first adjustment member 10 will be housed in a seat 20 realizeed in the case 2.
  • the seat 20 will essentially extend along the first adjustment direction Y.
  • the elastic member 19 will preferably be a spiral spring extended parallel to the first adjustment direction Y, with a first axial end coil 19' acting against the first adjustment member 10 and a second axial end coil 19" which abuts against the bottom wall 21 of the housing seat 20.
  • the case 2 will have symmetric configuration with respect to a center line plane ⁇ substantially parallel to the first adjustment direction Y.
  • case 2 can be provided with two mirroring seats 20, 20' arranged for receiving respective first adjustment members 10 and two cavities 17, 17' arranged for receiving respective second adjustment members 11.
  • the adjustment means 9 can be arranged on one of the sides of the symmetry plane ⁇ , as required, conferring greater flexibility of use to the switch 1.
  • case 2 can be provided with anchorage means 22 for stably anchoring to the fixed part F of the plant.
  • the anchorage means 22 can be defined by one or more passages or slots 23, 23' alignable with corresponding holes (not illustrated) provided on the fixed part F of the plant.
  • the switch 1 will first be positioned on the fixed part F of the plant, at the predetermined end position, by inserting the projecting portion 10' of the first adjustment member 10 into the hole H of the fixed part F.
  • the upper passages 23, 23' provided for in the case 2 will instead be aligned with the respective upper holes in order to allow the insertion of corresponding screws or pins 24, 24'.
  • the rotation direction will depend on the type of screw 11 used and on the necessary direction for the translation t 1 of the first adjustment member 10, depending on whether it is necessary to move the actuation head 5 away from or closer to the end point.
  • the anchoring of the switch 1 to the fixed part F of the plant can also be carried out with the interposition of a bracket or similar intermediate support (not illustrated), which can in turn be anchored to the fixed part F of the plant according to any one technique.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Switches With Compound Operations (AREA)
  • Electrophonic Musical Instruments (AREA)
EP20110001531 2010-02-26 2011-02-24 Interrupteur de fin de course Active EP2362402B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVI2010A000055A IT1398459B1 (it) 2010-02-26 2010-02-26 Interruttore di posizione

Publications (2)

Publication Number Publication Date
EP2362402A1 true EP2362402A1 (fr) 2011-08-31
EP2362402B1 EP2362402B1 (fr) 2013-04-17

Family

ID=42803932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110001531 Active EP2362402B1 (fr) 2010-02-26 2011-02-24 Interrupteur de fin de course

Country Status (2)

Country Link
EP (1) EP2362402B1 (fr)
IT (1) IT1398459B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20163941A1 (it) * 2016-05-30 2017-11-30 Pizzato Elettrica Srl Struttura modulare per interruttori di sicurezza per il controllo di accessi

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1150733B (de) * 1961-07-13 1963-06-27 Agfa Ag Einstellbare Haltevorrichtung fuer elektrische Schalter
US3596017A (en) * 1970-04-29 1971-07-27 Collins Radio Co Mechanical adjustment means for electrical limit switches
US4342885A (en) 1980-03-27 1982-08-03 Matsushita Electric Works, Ltd. Limit switch
DE3140459A1 (de) 1981-10-12 1983-04-28 Pepperl & Fuchs Gmbh & Co Kg, 6800 Mannheim Einstellschieber fuer eine justierbare anbringung eines endschalters
US4916265A (en) 1988-11-21 1990-04-10 Gary D. Thomas Adjustable mounting assembly for a limit switch
US6875922B1 (en) * 2004-04-22 2005-04-05 Pw Industries, Inc. Position adjustable outlet box system
EP1710819A2 (fr) * 2005-04-06 2006-10-11 K.A. Schmersal Holding KG Appareil pour détecter l'état fermé de deux parties déplaçables relativement

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1150733B (de) * 1961-07-13 1963-06-27 Agfa Ag Einstellbare Haltevorrichtung fuer elektrische Schalter
US3596017A (en) * 1970-04-29 1971-07-27 Collins Radio Co Mechanical adjustment means for electrical limit switches
US4342885A (en) 1980-03-27 1982-08-03 Matsushita Electric Works, Ltd. Limit switch
DE3140459A1 (de) 1981-10-12 1983-04-28 Pepperl & Fuchs Gmbh & Co Kg, 6800 Mannheim Einstellschieber fuer eine justierbare anbringung eines endschalters
US4916265A (en) 1988-11-21 1990-04-10 Gary D. Thomas Adjustable mounting assembly for a limit switch
US6875922B1 (en) * 2004-04-22 2005-04-05 Pw Industries, Inc. Position adjustable outlet box system
EP1710819A2 (fr) * 2005-04-06 2006-10-11 K.A. Schmersal Holding KG Appareil pour détecter l'état fermé de deux parties déplaçables relativement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUA20163941A1 (it) * 2016-05-30 2017-11-30 Pizzato Elettrica Srl Struttura modulare per interruttori di sicurezza per il controllo di accessi
WO2017208126A1 (fr) * 2016-05-30 2017-12-07 Pizzato Elettrica S.R.L. Structure modulaire servant à des commutateurs de sécurité servant à un contrôle d'accès

Also Published As

Publication number Publication date
IT1398459B1 (it) 2013-02-22
ITVI20100055A1 (it) 2011-08-27
EP2362402B1 (fr) 2013-04-17

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