EP0871188A1 - Interrupteur de sécurité à clé - Google Patents

Interrupteur de sécurité à clé Download PDF

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Publication number
EP0871188A1
EP0871188A1 EP97117694A EP97117694A EP0871188A1 EP 0871188 A1 EP0871188 A1 EP 0871188A1 EP 97117694 A EP97117694 A EP 97117694A EP 97117694 A EP97117694 A EP 97117694A EP 0871188 A1 EP0871188 A1 EP 0871188A1
Authority
EP
European Patent Office
Prior art keywords
cam
key
slider
safety switch
switch according
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
EP97117694A
Other languages
German (de)
English (en)
Other versions
EP0871188B2 (fr
EP0871188B1 (fr
Inventor
Bernardo Pizzato
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
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=11426324&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0871188(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Pizzato Elettrica SRL filed Critical Pizzato Elettrica SRL
Publication of EP0871188A1 publication Critical patent/EP0871188A1/fr
Application granted granted Critical
Publication of EP0871188B1 publication Critical patent/EP0871188B1/fr
Publication of EP0871188B2 publication Critical patent/EP0871188B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards
    • H01H2027/005—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards the key receiving part having multiple openings to allow keys from different directions to operate the switch

Definitions

  • the present invention relates to a key-controlled safety switch for controlling protections of machines and industrial plants, such as for example doors of control cabinets and moving barriers for accessing work areas.
  • the function of this kind of switch is to send a stop signal when the protection is opened or tampered with.
  • Conventional switches of the above described type essentially include a case which can be anchored to the fixed part of the protection of the machine and internally accommodates at least one fixed electrical contact and at least one moving electric contact; these contacts can interact selectively in order to open or close the external electrical circuit of the machine.
  • a cap or head is detachably installed on the case and contains a mechanism for locking and actuating the moving electric contact.
  • the head is also provided with a slot for the insertion of a key-type device which can be anchored to the moving part of the protection of the machine. The insertion of the key in the slot releases and changes the position of the head actuation mechanism, causing the selective movement of the moving electric contact and the consequent opening or closure of the electric circuit.
  • the contacts can be actuated only with the key, while actuation is practically impossible by using screwdrivers, wires or other conventional tools.
  • Safety switches are known in which the moving contact is fitted on a stem which can slide along a longitudinal axis of the body and on which there acts a wheel or cam which is part of the actuation mechanism.
  • the cam is installed on supports of the head, so that it rotates about an axis which lies transversely to the axis of the stem, and is provided with locking devices which prevent its rotation unless the key has been inserted for at least a certain part of its stroke.
  • the locking devices are constituted by one or more blocks located to the sides of the cam and provided with protrusions which cooperate axially with complementary hollows formed on the lateral faces of the cam.
  • the blocks are mounted so that they can slide but cannot rotate on the axis of the cam and are normally moved toward the cam by virtue of compression springs so as to lock the rotation of the cam.
  • the chamfered end of the key-type actuator axially moves the blocks away from the cam, so as to allow the free rotation thereof, switching the switch.
  • the blocks that can slide axially with respect to the cam are replaced with sliders which can move at right angles to its rotation axis.
  • the sliders have protrusions or stop members which are meant to engage complementarily shaped parts provided in the cam in order to prevent rotation thereof until the key-type actuator is inserted and pushed in the head.
  • US-A-5,587,569 (EJA) describes a key-controlled switch with two apertures, with two sliders which can slide along guides which are formed on the lateral supports of the actuation cam and interact with complementary parts formed on the cam.
  • US-A-5,516,993 (BERNSTEIN) describes a switch with two apertures and with two sliders which can slide along guides formed in the side walls of the actuation cam and rotate together with the cam.
  • the sliding direction of the locking sliders is substantially perpendicular to the direction in which the key is inserted and made to slide. Accordingly, the movement of the locking sliders occurs by virtue of inclined planes provided on the key and on the sliders.
  • the key-type actuator furthermore slides along the sliders over most of its insertion stroke.
  • the parts of the locking mechanism are very small, are composed of multiple components, are fragile and are subject to sudden movements.
  • An aim of the present invention is to eliminate the above drawbacks, providing a key-controlled safety switch which is constructively very simple, highly reliable, mechanically strong and flexible in assembly.
  • a particular object is to eliminate, or at least minimize, sliding and therefore mechanical wear, increasing life and reliability.
  • a further object is to provide a key-controlled safety switch constituted by a minimal number of very strong parts.
  • a further object is to facilitate the positioning of the switch, keeping the distances between its fixed and moving parts substantially unchanged.
  • a key-controlled safety switch which includes a case with a longitudinal axis which internally accommodates fixed and moving electric contacts which are suitable to interact in order to change the state of the switch, a prism-shaped head which has, on opposite sides of an end edge, two slots for the insertion of a key-type actuator along two mutually perpendicular directions, the head internally accommodating a cam for the actuation of the moving contacts which can rotate about a substantially transverse axis and locking devices which include at least one slider with a stop member which is arranged laterally to the cam, the locking devices and the cam being actuatable exclusively with the key-type actuator, characterized in that the direction of the sliding of the slider is substantially perpendicular to the rotation axis of the cam and is inclined with respect to both of the insertion directions of the actuator, and in that the slots for the insertion of the actuator are substantially equidistant from the end edge.
  • the position of the slots simplifies the placement of the switch if the head is rotated in order to adapt it to the machine.
  • the key-controlled safety switch generally designated by the reference numeral 1, includes a case 2 which is shaped approximately like a parallelepiped and can be anchored to the fixed part of a protection of a machine, for example the frame of a control cabinet, and an actuation head 3 which can be detachably anchored to the case 2 in different positions to adapt it to the specific requirements of installation on the machine.
  • the case 2 accommodates pairs of fixed contacts 4 and 5 and respective pairs of moving contacts 6 and 7.
  • the contacts are fixed to bridges which are rigidly coupled to a shank 8 which can move inside the case 2 along a longitudinal axis L and has an end 9 which protrudes outside the case 2.
  • the contact bridge 6 closes the pair of contacts 4
  • the contact bridge 7 closes the pair of contacts 5, correspondingly varying the switching state of the switch.
  • the head 3 is formed by a prism-shaped cap 10 which is anchored to the case 2 by virtue of screws 11.
  • Two slots 12 and 13 are formed on the cap 10, respectively on two faces which are adjacent to an end edge 14. Through the slots 12 and 13 it is possible to insert a key-type actuator member 15, which is fixed to the moving part of a protection of a machine, for example the door of the previously mentioned control cabinet.
  • the key-type actuator 15 has a special shape, described in detail hereafter, in respective directions ⁇ and ⁇ which are mutually perpendicular and are respectively parallel and transverse with respect to the longitudinal axis L of the case 2.
  • the two slots 12 and 13 have the same distance from the lateral edge 14, so as to facilitate installing the switch with its head rotated.
  • the cap 10 of the head 3 internally accommodates an actuation cam 16, which has a central hub 17 whose cross-section is approximately square; a pin 18 whose axis is designated by the reference letter H is inserted in the hub.
  • the ends of the pin 18 are keyed in two holes 19 and 20 formed in respective lateral supports 21 and 22 which protrude from a connecting plate 23.
  • the connecting plate 23 is provided with two lateral tabs 24 which can be inserted in a snap-together fashion in corresponding openings 25 of the cap 10, and is provided with holes 26 which are aligned with the screws 11 for the detachable anchoring of the head 3 to the case 2, keeping the cam mounted on the pin 18.
  • the external profile of the cam 16 has a protrusion 28 with a local recess 29 in order to keep the shank stably in the stroke limit position shown in Figure 5, in which the moving contacts 6 short-circuit the fixed contacts 4 when the key-type actuator 15 is not inserted in the head.
  • On the external profile of the cam 16 there is also a first concavity 30 which is meant to keep the shank 8 in the stroke limit position shown in Figure 6, in which the moving contacts 7 short-circuit the contacts 5 when the key-type actuator 15 is inserted in the slot 12.
  • a second concavity 31 which keeps the shank 8 in the same stroke limit and electrical switching position shown in Figure 6, but does so when the key-type actuator 15 is inserted in the other slot 13.
  • the actuator 15 has, toward the free ends of two arms 35 and 36, respective mutually opposite lugs 37 and 38 which are separated by a gap which is slightly greater than the thickness of the partition 34; the lugs can engage the seats 32 and 33 of the cam 16.
  • the locking devices are constituted by at least one, preferably two sliders or blocks 39 which are arranged to the sides of the cam 16 and can slide along guiding devices which are perpendicular to the rotation axis of the cam.
  • Each slider is constituted by a single monolithic component which is considerably tough and wear-resistant.
  • the direction of the sliding of each slider 39 upon insertion of the key-type actuator 15 is inclined with respect to the directions of insertion of the actuator in both slots 12 and 13.
  • each slider with respect to the insertion directions ⁇ and ⁇ of the key-type actuator are substantially identical and equal to approximately 45°.
  • devices for guiding the sliders 39 are formed on the opposite side walls of the cam 16.
  • the guiding devices are constituted by two lateral ridges 40 and 41 which guide the longitudinal sides of each slider 39 and by the central hub 17 itself of the cam 16, which guides a central longitudinal opening 42 provided in most of the length of each slider 39.
  • each slider 39 which is close to the slots 12 and 13 is rounded in order to reduce friction against the key-type actuator 15, whilst the opposite end has a stop tooth 44 which is directed laterally outward.
  • Each stop tooth 44 is inserted in, and guided by, a corresponding groove 45 formed on the internal faces of the lateral supports 21 and 22 of the connecting plate 23 during the rotation of each slider 39 together with the cam 16.
  • each groove 45 has a main portion 46 which is shaped like a circular sector and is concentric with respect to the holes 19 and 20 of the rotation axis of the cam 16 and has an aperture angle of approximately 90°; a short central portion 47 protrudes from the main portion, is directed radially toward the center and is slightly flared in a V-like shape in order to facilitate the repositioning of the stop tooth 44 in the initial position shown in Figure 5.
  • elastic devices which are constituted by a compression spring 48 which is inserted in the longitudinal cavity 42, is retained by a protrusion 49 and acts on the hub 17.
  • the key-type actuator 15 can be inserted in one of the slots 12 and 13 of the head 3, as shown in Figure 5; its mutually opposite lugs 37 and 38 enter the seats 32 and 33, pushing the sliders 39 in the direction of the guides 40 and 41 on the cam 16 by an extent of the stroke which is sufficient to disengage the stop tooth 44 from the groove portion 47.
  • the cam 16 cannot rotate and therefore performs no electrical switching of the switch. It is noted that the mutual sliding of each slider 39 with respect to the cam 16 is limited only to the radial extension of the groove portion 47, minimizing friction, wear and jamming which are typical of locking devices according to the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Switches With Compound Operations (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Lock And Its Accessories (AREA)
EP97117694A 1997-04-11 1997-10-13 Interrupteur de sécurité à clé Expired - Lifetime EP0871188B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97VI000054A IT1292975B1 (it) 1997-04-11 1997-04-11 Interruttore di sicurezza a chiave.
ITVI970054 1997-04-11

Publications (3)

Publication Number Publication Date
EP0871188A1 true EP0871188A1 (fr) 1998-10-14
EP0871188B1 EP0871188B1 (fr) 2000-09-06
EP0871188B2 EP0871188B2 (fr) 2005-08-10

Family

ID=11426324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97117694A Expired - Lifetime EP0871188B2 (fr) 1997-04-11 1997-10-13 Interrupteur de sécurité à clé

Country Status (5)

Country Link
EP (1) EP0871188B2 (fr)
AT (1) ATE196212T1 (fr)
DE (1) DE69703026T3 (fr)
ES (1) ES2151700T5 (fr)
IT (1) IT1292975B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7345252B2 (en) 2004-10-21 2008-03-18 Omron Corporation Key switch
WO2013077817A1 (fr) * 2011-11-22 2013-05-30 Pi̇lsan Plasti̇k Ve Oyuncak Sanayi̇ Anoni̇m Şi̇rketi̇ Verrou de sécurité pour commutateurs électriques
CN111668042A (zh) * 2020-06-19 2020-09-15 三实电器(漳州)有限公司 一种带强制动作机构组合开关模块的使用方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995024726A1 (fr) * 1994-03-10 1995-09-14 Euchner & Co. Interrupteur de securite
US5516993A (en) * 1993-11-15 1996-05-14 Hans Bernstein Spezialfabrik fur Schaltkontake GmbH & Co. Safety switch
US5587569A (en) * 1992-06-02 1996-12-24 E. J. A. Engineering Plc Safety switch assemblies

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4303367C1 (de) † 1993-02-05 1994-02-24 Schmersal K A Gmbh & Co Sicherheitsschalter
GB9326394D0 (en) † 1993-12-24 1994-02-23 Eja Eng Plc Safety switch assemblies
DE4432862C1 (de) † 1994-09-15 1995-10-26 Schmersal K A Gmbh & Co Radiusbetätiger für einen Sicherheitsschalter
DE4436579C2 (de) † 1994-10-13 1997-05-22 Bernstein Hans Spezialfabrik Sicherheitsschalter
DE19649717A1 (de) † 1996-11-30 1998-06-04 Euchner Gmbh & Co Sicherheitsschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5587569A (en) * 1992-06-02 1996-12-24 E. J. A. Engineering Plc Safety switch assemblies
US5516993A (en) * 1993-11-15 1996-05-14 Hans Bernstein Spezialfabrik fur Schaltkontake GmbH & Co. Safety switch
WO1995024726A1 (fr) * 1994-03-10 1995-09-14 Euchner & Co. Interrupteur de securite

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7345252B2 (en) 2004-10-21 2008-03-18 Omron Corporation Key switch
DE102005050313B4 (de) * 2004-10-21 2008-05-08 Omron Corporation Schlüsselschalter
DE102005050313B8 (de) * 2004-10-21 2008-08-14 Omron Corporation Schlüsselschalter
WO2013077817A1 (fr) * 2011-11-22 2013-05-30 Pi̇lsan Plasti̇k Ve Oyuncak Sanayi̇ Anoni̇m Şi̇rketi̇ Verrou de sécurité pour commutateurs électriques
CN111668042A (zh) * 2020-06-19 2020-09-15 三实电器(漳州)有限公司 一种带强制动作机构组合开关模块的使用方法
CN111668042B (zh) * 2020-06-19 2023-01-03 三实电器(漳州)有限公司 一种带强制动作机构组合开关模块的使用方法

Also Published As

Publication number Publication date
ES2151700T3 (es) 2001-01-01
ATE196212T1 (de) 2000-09-15
ITVI970054A1 (it) 1998-10-11
EP0871188B2 (fr) 2005-08-10
DE69703026D1 (de) 2000-10-12
DE69703026T3 (de) 2006-06-29
ES2151700T5 (es) 2005-12-16
ITVI970054A0 (fr) 1997-04-11
IT1292975B1 (it) 1999-02-11
DE69703026T2 (de) 2001-05-03
EP0871188B1 (fr) 2000-09-06

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