EP3428943B1 - Electric safety contact actuated by a removable actuation key - Google Patents

Electric safety contact actuated by a removable actuation key Download PDF

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Publication number
EP3428943B1
EP3428943B1 EP18182489.7A EP18182489A EP3428943B1 EP 3428943 B1 EP3428943 B1 EP 3428943B1 EP 18182489 A EP18182489 A EP 18182489A EP 3428943 B1 EP3428943 B1 EP 3428943B1
Authority
EP
European Patent Office
Prior art keywords
limit stop
stop position
shuttle
pin
contact
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
EP18182489.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3428943A1 (en
Inventor
Andrea Traunero
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.)
Astra Srl
Original Assignee
Astra 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 Astra Srl filed Critical Astra Srl
Publication of EP3428943A1 publication Critical patent/EP3428943A1/en
Application granted granted Critical
Publication of EP3428943B1 publication Critical patent/EP3428943B1/en
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
    • 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
    • H01H45/00—Details of relays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H45/00—Details of relays
    • H01H45/14—Terminal arrangements
    • 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

Definitions

  • This invention relates to an electrical safety contact actuated by means of a removable actuation key, meaning an electrical contact in which the closing of the contacts is performed by a movable bridge contained within the contact body and not removable, whose actuation towards and away from the electrical contacts to be put into electrical communication with each other is ensured by an external removable actuation key.
  • the terminals of the removable bridge inside the body of the electrical safety contact necessarily require that said body provide access openings that are not able to assure any impermeability from splashes and the like of the electrical safety contact and of the electrical components contained therein.
  • the safety contacts actuated by means of a removable actuation key of the type specified above allow overcoming this problem thanks to the fact that the movable bridge and the relevant contact points remain in a protected position inside the body of the electrical safety contact by means of a removable actuation key, since it is therefore possible to ensure a high degree of impermeability of the electrical parts present inside the contact.
  • the actuation of the internal movable bridge is performed by a removable actuation key that does not perform any electrical continuity function, being only provided for to activate the movement of a mobile shuttle that acts as a support for the movable bridge.
  • the insertion of the actuating key into the body of the electrical safety contact determines the advancement of the aforesaid shuttle towards an advanced limit stop position, with simultaneous closing of an electrical contact of the normally open type or an opening of an electrical contact of the normally closed type.
  • the interruption of the electrical continuity between the contacts of the electrical safety contact upon the removal of the actuation key is in any case ensured by the fact that the electric contact comprises hook means associated with the shuttle, which, upon reaching the advanced end configuration of the shuttle, engage the free end of the removable key inserted in the body of the electrical safety contact itself.
  • the forced removal of the key from the body of the electrical contact ensures, even in case of partial welding between the electrical contacts, the interruption of the electrical continuity inside the normally open safety contact, thanks to the fact that the free end of the actuation key moves the shuttle towards the back position by acting on the hook means associated with the shuttle.
  • the problem underlying this invention is that of devising and making available an electrical safety contact with actuation by means of a removable actuation key, which meets the need to allow a high range of actuation of the removable key with respect to the height of the insertion channel of the actuation key, a high degree of waterproofing, as well as the need to ensure in any case the interruption of the electrical continuity between the contacts following the removal, even forced, of the removal key from the body of the electrical safety contact, while ensuring a structural simplification of the electrical contact, so as to facilitate assembly, and reduce the overall dimensions of the electrical contact with respect to the corresponding electrical contacts of the prior art, such as for example the electrical contact of EP 0920043 .
  • 1 generically indicates a safety electric contact according to the invention with actuation by means of a removable actuation key 18.
  • the electrical safety contact 1 comprises:
  • the above-mentioned passage is identified by at least one passing-through opening formed in the body 2.
  • the electrical safety contact comprises fluid-tight cable glands 4 positioned at the above-mentioned passage, or of the aforesaid at least one passing-through opening.
  • the electrical safety contact comprises fluid-tight cable glands 4 positioned at the above-mentioned passage, or of the aforesaid at least one passing-through opening.
  • resin, glue or other sealing elements it is possible to provide for the presence of resin, glue or other sealing elements to seal the above-mentioned passage in the presence of electrical conductors
  • the above-mentioned wiring means 5 comprise two separate screw terminals suitable for clamping the terminals of external electrical conductors.
  • the above-mentioned wiring means comprise a welding, for directly welding the terminal of an external electrical conductor to the wiring means, connector means and the like.
  • the above-mentioned shuttle 10 is supported and guided inside the body 2 to perform inside the body 2 a displacement having at least a translational displacement component in the above-mentioned longitudinal direction X-X (preferably to perform a displacement of only translation in the above-mentioned longitudinal direction X-X) and moving reversibly in said longitudinal direction X-X from a retracted limit stop position (see Fig. 5 ) towards an advanced limit stop position (see Fig. 6 ) in which the rear end 10a of said shuttle 10 is closer to said first electrical contacts 6.
  • the above-mentioned elastic means 12 act between the body 2 and the shuttle 10 to push the shuttle 10 towards the above-mentioned retracted limit stop position with a preset elastic preload (see Fig. 5 ), in which the shuttle 10 is therefore positioned by the elastic means 12 in the absence of forces applied by the removable actuation key 18, for example when the removable actuation key has been removed from the body 2 and therefore does not exert any action on the shuttle 10.
  • the above-mentioned retracted limit stop position (see Fig. 5 ) of the shuttle 10 corresponds to the position in which the shuttle is positioned by the elastic means 12 in the absence of forces applied by the removable actuation key 18, i.e. when the removable actuation key has been removed from the body 2 and therefore exercises no action on the shuttle 10.
  • the above-mentioned hook 11 comprises a rear portion 11a, which is connected to the front end 10b of the shuttle 10 by means of articulated linking means, and an opposed front portion 11b shaped like a hook to engage an end portion of an external removable actuation key 18.
  • an outer front wall 14 can be identified facing away from the rear portion 11a.
  • the above-mentioned movable bridge 7 is associated in translation with the shuttle 10, preferably so as to be rigidly connected in translation to the shuttle 10, being it possible to envisage embodiments wherein the movable bridge 7 is supported by the shuttle 10 in a sprung way by the springs interposition.
  • the movable bridge 7 is supported near the rear end 10a of the shuttle 10.
  • the electrical safety contact 1 is of the normally open (NO) type, and therefore the above-mentioned first limit stop position coincides with the above-mentioned advanced limit stop position.
  • the second contacts 8 of the movable bridge 7 are in contact with the first contacts 6, thus establishing an electrical communication between said first contacts 6, so that the electrical safety contact 1 is in a closed contact configuration.
  • the second contacts 8 of the movable bridge 7 are spaced from the above-mentioned first contacts 6 and the electrical safety contact 1 is in an open contact configuration.
  • a longitudinal passage 16 is identified, extended in the above-mentioned longitudinal direction X-X, which allows the reversible insertion in the body 2 of a removable actuation key 18 necessary for pushing the shuttle 10 towards the insertion advanced limit stop position (see Fig. 5 ).
  • the body 2 there is an internal seat, extended in the longitudinal direction X-X, which identifies the above-mentioned longitudinal passage 16, in which the movable hook 11, the springs 12 and, partially, the shuttle 10 are housed inside the body 2.
  • the above-mentioned inner seat of the body 2 is open at the front end 2b of the body 2 itself, to allow axial insertion into said internal seat of the removable actuation key 18 starting from the front end of the body 2 itself.
  • the above-mentioned articulated connecting means comprise a first pivot pin 13, supported by the shuttle 10 transversely to the longitudinal direction X-X, to make the movable hook 11 integral in translation to the shuttle 10 in the above-mentioned longitudinal direction X-X, at the same time allowing said movable hook 11 rotating reversibly with respect to the shuttle 10 itself:
  • the kinematic engagement performed by the above-mentioned articulated connecting means causes a translation in the longitudinal direction X-X of the shuttle 10 from the retracted limit stop position (see Fig. 5 ) to the advanced limit stop position (see Fig. 6 ) involves a corresponding translation in said longitudinal direction X-X also of said movable hook 11, as well as a simultaneous movement of said movable hook 11 from said lifted limit stop position to said lowered limit stop position and vice versa.
  • the actuation key 18 acts only on the shuttle 10 without interfering with the movable hook 11, whose displacement between the lifted position and the lowered position, as said, is determined by the kinematics imposed by the articulated linking means following a translation of the shuttle 10 in the longitudinal direction X-X. Following the removal of the actuation key 18 from the longitudinal passage 16 of the body, the withdrawal of the shuttle 10 from the advanced limit stop position to the retracted limit stop position is ensured by the springs 12.
  • the removal of the actuation key 18 involves action of the actuation key 18 on the front portion 11b of the hook 11 such as to cause a forced retraction of the shuttle 10 and the opening of the electrical contact.
  • the above-mentioned outer front wall 14 of the front portion 11b of the movable hook 11 is advantageously inclined with respect to the longitudinal direction X-X by an angle smaller than 90°, to bring the movable hook 11 into the above-mentioned lifted limit stop position when inside of the passage 16 said inclined front portion 11b is pushed, so that on the movable hook 11 a rotating torque is generated with respect to the first pin 13 such as to cause an opening rotation of the movable hook 11 towards the above-mentioned lifted limit stop position (see Fig. 5 ) when acting against said external front wall 14, for example through the removable key 18 as shown in Figure 8 , with a force F parallel to the longitudinal direction X-X and having direction towards the shuttle 10.
  • the above-mentioned inclination of the outer front wall 14 of the front portion 11b of the movable hook 11 enables insertion into the above-mentioned longitudinal passage 16 of the body 2 of the removable actuation key 18 even when the movable hook 11 partially obstructs the above-mentioned longitudinal passage 16 being in an intermediate position (see Fig. 8 ) included between said lifted limit stop position (see Fig. 5 ) and said lowered limit stop position (see Fig. 8 ) between the lifted limit stop position (see Fig. 5 ) and said lowered limit stop position (see Fig. 6 ).
  • the above-mentioned rotating torque generated by the pressure of the front end of the removable actuation key 18 on the outer front wall 14 of the front portion 11b conformed to hook of the movable hook 11, causes an opening rotation about the first pin 13 of the movable hook 11 towards the above-mentioned lifted limit stop position (see Fig. 5 ), so as to restore a correct configuration of the safety electrical contact 1, obviously, with subsequent correct operation when closing it (see Fig. 6 ) following a further insertion of the removable actuation key 18.
  • the above-mentioned first pivot pin 13 engages a first seat 15a present in the rear portion 11a of the movable hook 11, said first seat 15a constituting the bottom end of a first open slot 15 accessible from the outside of the rear portion 11a of the movable hook 11, so as to allow the above-mentioned open slot 15 of the rear portion 11a to be inserted on the first pivot pin 13.
  • the first open slot 15 is oriented so as to have the opening oriented towards the front end 2b of the body 2 (to the left in Fig. 5 ) or at the most rotated for not more than 90° with respect to said orientation.
  • the above-mentioned articulated linking means also comprise:
  • the above-mentioned second slot 21 is an open slot accessible from the outside of the rear portion 11a of the movable hook 11, to allow insertion of said second slot 21 on said second pivot pin 19.
  • the kinematic engagement between the first slot 15 and the first pin 13, as well as between the second slot 21 and the second pin 19 determines that a translation in the longitudinal direction X-X of the shuttle 10 from the retracted limit stop position (see Fig. 5 ) to the advanced limit stop position (see Fig. 6 ) involves a translation in said longitudinal direction X-X also of said movable hook 11, as well as a simultaneous movement of said movable hook 11 from said lifted limit stop position (see Fig. 5 ) to said lowered limit stop position (see Fig. 6 ) and vice versa.
  • the above-mentioned second pin 19 is positioned at a height of the body 2 different from the dimension to which the first pin 13 is located, preferably the second pin 19 is more widely spaced from the longitudinal axis X-X of said longitudinal passage 16 with respect to said first pin 13.
  • the above-mentioned first pin 13 is positioned at said longitudinal passage 16, as shown in the figures.
  • the first pin 13 is more spaced than the second pin 19 from the rear end 2a of the body 2.
  • the removable actuation key 18 comprises a stem 18b that ends with a free end 18a that, when inserted in the above-mentioned longitudinal passage 16 of the body 2, acts on the shuttle 10 for reversibly pushing the shuttle 10 from the retracted limit stop position (see Fig. 5 ) towards the advanced limit stop position (see Fig. 6 ) and being engaged by the front portion 11b of the movable hook 11.
  • the above-mentioned kinematism therefore allows to always ensure the correct insertion of the removable actuation key 18 in the longitudinal passage 16 of the body 2, ensuring a correct closing or opening condition of the safety electrical contact 1.
  • FIGS. 11a, 11b, 11c and 11d show in succession the sequence according to which it is possible to associate the movable hook 11 with the shuttle 10, essentially: first the movable hook 11 is assembled at the rear end 10b of the shuttle 10 and then it's possible to insert the hook-shuttle assembly in the longitudinal passage 16 of the body 2, starting from the front opening, then arranging to insert from above the bridge 7 on the front end 10a of the shuttle 10, so to prevent the hook-shuttle assembly from coming out of the longitudinal passage 16 of the body 2.
  • Figures 10a, 10b, 10c and 10d show respective flat views of the hook of Figure 9 according to possible embodiments.
  • the electrical safety contact with actuation by means of a removable actuation key enables the above-mentioned requirements to be met and at the same time overcoming the drawbacks referred to in the introductory part of this description with reference to the prior art.
  • the electrical safety contact with actuation by means of a removable actuation key allows to remedy the situation in which the removal of the removable actuation key, with the simultaneous passage of the safety electrical contact in an open electrical contact configuration, also occurs as a result of a partial reactivation of the internal mechanisms, in particular, of the hook 11.
  • the possibility of the electrical safety contact according to the invention to ensure correct insertion of the removable actuation key into the longitudinal passage of the body, even if the movable hook is partially obstructing the above-mentioned longitudinal passage, does not require to minimize the height gaps necessary to allow the insertion of the removable actuation key into the above-mentioned longitudinal passage. Consequently, the electrical safety contact according to the invention allows to ensure a greater range of insertion of the key in the above-mentioned longitudinal passage with respect to the devices of the prior art.
  • the possibility of being able to mount the electrical safety contact without having to perform operations for inserting pins and the like once the movable hook has been inserted makes it possible to considerably simplify the possibility of easily and quickly assembling the electrical safety contact with respect to the models previously known, also allowing to considerably contain the dimensions and overall dimensions of the electrical safety contact according to the invention with respect to the prior art models.
  • the above-mentioned first limit stop position of the shuttle coincides with the above-mentioned retracted end position of the shuttle, as the first electrical contacts are positioned in such a way to be yieldingly displaced by the second electrical contacts carried by the movable bridge (in said longitudinal direction and away from the rear end of the body) when the shuttle is in the above-mentioned first limit stop position coinciding with the retracted limit stop position.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Lock And Its Accessories (AREA)
EP18182489.7A 2017-07-10 2018-07-09 Electric safety contact actuated by a removable actuation key Active EP3428943B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000077432A IT201700077432A1 (it) 2017-07-10 2017-07-10 Contatto elettrico di sicurezza con azionamento mediante chiave di azionamento asportabile

Publications (2)

Publication Number Publication Date
EP3428943A1 EP3428943A1 (en) 2019-01-16
EP3428943B1 true EP3428943B1 (en) 2020-04-22

Family

ID=61005902

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18182489.7A Active EP3428943B1 (en) 2017-07-10 2018-07-09 Electric safety contact actuated by a removable actuation key

Country Status (4)

Country Link
EP (1) EP3428943B1 (it)
CN (1) CN109243917B (it)
ES (1) ES2797558T3 (it)
IT (1) IT201700077432A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100025196A1 (it) 2021-09-30 2023-03-30 Astra S R L Contatto elettrico di sicurezza con azionamento mediante chiave di azionamento asportabile

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2428295A1 (de) * 1974-06-12 1976-01-02 Paul Merkle Zwischenhebel fuer sicherheitsausschalter mit schloss
DE2428458C3 (de) * 1974-06-12 1981-04-02 Paul 7032 Sindelfingen Merkle Schlüssel-betätigbare Schalterverriegelungseinrichtung mit einem Flachsteckstiftschloß
DE3819753A1 (de) * 1988-06-10 1989-12-14 Kronenberg Gmbh H & J Sicherheitsschalter
CN1130741C (zh) * 1996-08-13 2003-12-10 K·A·施梅尔索尔公司 安全开关
DE29720862U1 (de) * 1997-11-25 1998-01-15 Hans Bernstein Spezialfabrik für Schaltkontakte GmbH & Co, 32457 Porta Westfalica Sicherheitsschalter
JP5391068B2 (ja) * 2007-09-06 2014-01-15 Ｉｄｅｃ株式会社 スイッチ装置
EP2390888B1 (en) * 2010-05-26 2012-07-11 Rockwell Automation Limited Safety switch
WO2012113102A1 (en) * 2011-02-25 2012-08-30 Honeywell International Inc. Electrical switch system and electrical switch assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN109243917A (zh) 2019-01-18
ES2797558T3 (es) 2020-12-02
IT201700077432A1 (it) 2019-01-10
CN109243917B (zh) 2022-10-25
EP3428943A1 (en) 2019-01-16

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