EP0345656B1 - Sicherheitsschalter - Google Patents

Sicherheitsschalter Download PDF

Info

Publication number
EP0345656B1
EP0345656B1 EP89109997A EP89109997A EP0345656B1 EP 0345656 B1 EP0345656 B1 EP 0345656B1 EP 89109997 A EP89109997 A EP 89109997A EP 89109997 A EP89109997 A EP 89109997A EP 0345656 B1 EP0345656 B1 EP 0345656B1
Authority
EP
European Patent Office
Prior art keywords
control
switch
wheel
shaft
housing
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.)
Expired - Lifetime
Application number
EP89109997A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0345656A3 (de
EP0345656A2 (de
Inventor
Hans-Heinrich Bockhorn
Alfred Köller
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.)
Hans and Jos Kronenberg GmbH
Original Assignee
Hans and Jos Kronenberg GmbH
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 Hans and Jos Kronenberg GmbH filed Critical Hans and Jos Kronenberg GmbH
Publication of EP0345656A2 publication Critical patent/EP0345656A2/de
Publication of EP0345656A3 publication Critical patent/EP0345656A3/de
Application granted granted Critical
Publication of EP0345656B1 publication Critical patent/EP0345656B1/de
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 invention relates to a safety switch which consists of a switch part, a control part and an actuating part according to the preamble of claim 1.
  • Such safety switches are e.g. known from EP-A-0 175 156.
  • the actuating part is attached to the door, flap or another movable part and this opposite the switch part with control part.
  • the switch part has a contact plunger which can be moved in its longitudinal direction, with contact bridges carried by it, and fixed contacts opposite these, which are in the circuit of the motor of the machine or the like.
  • the control part, through which the contact plunger of the switch part is actuated has a housing with a slot into which the control bracket of the actuating part can be inserted.
  • the invention relates to such safety switches in which a control rod with a cross pin pulls the contact plunger out of the switch part in order to close the contacts.
  • Such Safety switches are also designed so that when the control rod is pushed back, the contact plunger is inevitably pushed back again and the contacts are opened.
  • the contact plunger can of course also carry normally closed contacts in addition to the aforementioned work contacts.
  • Safety switches of the type in question here have a switching wheel for moving the control rod, which is rotatably arranged in the housing of the control part and is provided with control arms which are acted upon by a front bar of the actuating part.
  • the ratchet wheel then hits another control arm on a cross pin of the control rod and pulls it in the desired direction or pushes it back with another control arm.
  • control brackets of the actuating part of such safety switches and the shape and arrangement of the switching wheel are designed in such a way that operation without the special control brackets, for example by some simple tool, is not possible.
  • the invention has for its object to develop a safety switch of the aforementioned type so that this possibility of an impermissible Activation is no longer given.
  • the slide plate is not moved. This creates an opening on the front of the control bracket into which a control arm of the steering wheel can engage when it is rotated. This prevents the shifting of the switching wheel shaft, which is necessary for switching on, and the switching wheel rotates freely.
  • the slide plate is pressed by strong spring means in the direction in which the aforementioned opening is created on the front of the control bracket.
  • These spring means are so strong that they cannot be overcome by hand when the operating part is loosely carried and inserted, but only in that the base part of the operating part is attached to a door or the like is screwed tight.
  • the displaceability of the switching wheel shaft from one limit position to the other can be achieved per se by various means.
  • the ends of the shaft of the ratchet wheel are mounted in two brackets arranged on both sides thereof, which can be pivoted about bearing journals so that the shaft of the ratchet wheel can reach one or the other limit position.
  • the spring means that pull the ratchet together with the tabs into one limit position are torsion springs that are wound around the ends of the shaft. One end of each spring is connected to the ratchet wheel, while the other end is connected to or supported on the housing of the control part.
  • the bearing pins of the two tabs can be mounted in fixed bearings in the housing.
  • the safety switch according to the invention can be changed without changing the one slot be used on the other slot if the ratchet wheel is provided with further control arms and if the bearings of the tabs carrying the ratchet wheel are moved to a different position.
  • the bearing pins of the tabs in two Setting levers are mounted, which in turn are stored in fixed bearings in the housing and can be pivoted between two limit positions. In one limit position of the actuating lever, the ratchet wheel can then be controlled through a slot in the cover side, in the other limit position through a slot in the front side of the housing.
  • a switch part 1 consists of a switch part 1, a control part 8 and an actuating part 21.
  • a contact plunger 2 which carries two movable contact bridges 3, is arranged longitudinally displaceably in the housing of the switch part 1.
  • the upper contact bridge and the lower contact bridge each have two fixed contacts 4 opposite, the upper contact group is a normally closed contact, the lower one is a working contact.
  • control rod 12 At the lower end of the contact plunger 2 there is an annular groove 5 into which the fork 13 of a control rod 12 engages, which is guided in the control part 8 so as to be displaceable in its longitudinal direction.
  • This control rod 12 carries at its lower end a cross pin 14, both ends of which are guided in guide grooves 15 in the rear and front walls of the housing 9 of the control part 8.
  • control part 8 At the lower end of the control part 8 there is a slot 18 on the cover side and a slot 19 on the end face into which an actuating part can optionally be inserted. 1 to 6 the safety switch with cover-side insertion is shown.
  • a ratchet wheel with a plurality of control arms 31, 32, 33, 34, 35 and 36, rotatable about a bearing shaft 11.
  • the mounting of the shaft 11 is explained further below. 1 to 6, the parts used for this are omitted for the sake of clarity and only the switching wheel 10 is shown.
  • a driver 25 At a distance from the end beam 24 is a driver 25, likewise carried by the control bracket, which projects upwards from it and, as will be explained below, serves to advance the ratchet wheel 10.
  • slide plate 26 extending in the longitudinal direction of the control bracket, which carries at its end facing the end beam 24 an upwardly angled slide web 29, the task of which will also be explained.
  • a slide window 28 is located between this slide bar 29 and the end of the slide plate 26 fastened to the base part 22.
  • Fig. 2 shows the position of the aforementioned parts when the actuating part 21 is inserted a little further.
  • the front bar 24 has pushed the control arm 35 in front of it and thereby rotated the ratchet wheel 10 counterclockwise.
  • the driver 25 already comes into contact with the next control arm 36 of the switching wheel 10 and takes over the further advancement of the switching wheel.
  • the control arm 36 touches the slider web 29.
  • the ratchet wheel 10 can not yet be raised with the shaft in the new position 11 'to be described below, since it by the blocking area 31, which then abuts the cross pin 14, is prevented from doing so.
  • a further insertion of the actuating part 21 is possible, however, in that the slide plate 26 designed as a leaf spring bends into the position shown in dashed lines in FIG. 2.
  • the slide bar 29 then allows the control arm 36 to be rotated further under the action of the driver 25, the shaft 11 of the ratchet wheel still remaining in its place.
  • the ratchet wheel 10 can be raised with its shaft 11 into the upper position 11 'shown in FIG. 3. This increase is brought about by the slide plate 26 designed as a leaf spring with its front slide web 29. This new position is shown in Fig. 3. As can be seen, the blocking area 31 has now passed completely under the cross pin 14 and the latter engages in the cutout between the control arms 31 and 32.
  • the slide bar 29 is not in contact with the underside of the driver 25, as in the positions according to FIGS. 1 to 4 , but has a certain distance from it, so that a gap remains between the driver 25 and the slide web 29.
  • the control arm 36 pushed by the driver 25, then plunges into this gap and the switching wheel is not raised. Even when the driver 25 is advanced, the ratchet wheel 10 is rotated further and its shaft 11 remains in the previous position.
  • control arm 32 then no longer grips the cross pin 14 of the control rod 12, so that it is not pulled down.
  • the switching wheel runs through empty and the contact plunger 2 in the switch part 1 is not moved.
  • FIG. 7 shows the position of the parts which enable the shaft 11 to be displaced and which have been omitted in FIGS. 1 to 6 for the sake of clarity.
  • the ratchet wheel 10 is rotatably supported on the shaft 11, which projects from the ratchet wheel on both sides.
  • the inner ends 51 and 52 are held in slots in the ratchet wheel which extend tangentially from the ring grooves.
  • these two torsion springs press the shaft of the ratchet wheel into its position 11 and also exert a torque in a clockwise direction on the ratchet wheel 10.
  • the shaft 11 is supported in tabs 37 and 38, the shape of which can be seen in FIG. 9.
  • the bores 54 of these tabs receive the shaft 11.
  • the tabs are provided with bores 53, in which they are pivotally mounted about journals 43 and 44. These journals have a collar in the middle and are received at their other ends by bores 55 of the adjusting levers 39 and 40, the shape of which can be seen in FIG. 10.
  • control levers are provided with bores 56 for mounting in bearings 41 and 42 fixed to the housing by means of further bolts.
  • the sector of each actuating lever projecting radially outside of the bore 56 serves, as will be discussed below, to block the switch.
  • FIG. 11 the simplified representation of Fig. 1 of the control part is supplemented.
  • the representation of FIG. 11 is a section along the line VIII-VIII with respect to the latter movable parts 7, but for the sake of clarity the torsion springs have been omitted.
  • FIG. 12 again shows an enlarged and supplemented sectional view of the actuating part according to FIG. 4, namely in the end position with the actuating part fully inserted and the transverse pin 14 pulled down in the switched-on position.
  • FIG. 13 shows a representation of the entire safety switch, as in FIG. 1, but here the actuating part is not inserted on the cover side, as in FIG. 1, but rather on the end side, namely through the slot 19.
  • the adjusting levers 39 and 40 were pivoted into their other limit position and the bearing journal 43 visible in the drawing has thereby been pivoted into its other limit position 43 ', which can be seen from the outside through the housing slot 57. Accordingly, the tabs 37 and 38 have pivoted and the shaft 11 of the ratchet wheel 10 can now be pivoted along another arc that corresponds to the insertion of the actuating part through the front slot.
  • control part 8 with the position of its movable parts according to FIG. 13 is again shown enlarged in FIG. 14 for a clearer illustration, although the actuating part is omitted there.
  • control arm 35 of the switching wheel 10 is not acted upon by the end beam of the actuating part here, but rather the correspondingly designed control arm 33.
  • the driver 25 grips the control arm 34 of the switching wheel.
  • Fig. 15 shows the control part with the operating part fully inserted (not shown), in which case the control arm 32 has again gripped the transverse pin 14 on the control rod 12 and pulled downward, so that the switch 1 is switched over.
  • FIGS. 16 and 17 serve to supplement and clarify the representation of FIGS. 5 and 6, in which a non-screwed but loosely held actuating part is inserted on the cover side.
  • the control bracket 23 with the front bar 24 and the top-side driver 25 is carried by a base part 22, which mainly comprises a rigid base body 58.
  • the slide plate 26 arranged below the driver 25 and displaceable in the longitudinal direction of the control bracket has a slide window 28 above the window 68 of the control bracket. At its (left in FIG. 18) end, the slide plate 26 is held by a retaining web 59 which is within the corresponding U -shaped base body 58 of the base part 22 is located and also, together with the slide plate 26, is displaceable in the longitudinal direction of the control bracket 23.
  • the base 22 is fastened to a door or the like by means of screws 61 and 62.
  • Fig. 18 shows the position of the slide plate 26 with its front slide bar 29 in the screwed-on state of the actuating part. As can be seen, there is between the slide bar 29 of the slide plate 26 and the driver 25 of the control bracket no gap into which a control arm of the ratchet wheel could plunge, so that it is raised to the switchable position.
  • the slide plate 26 is advanced so that the slide web 29 reaches the position 29 'shown in broken lines in FIG. 18. Then there is a gap between the slide bar and driver and the control arm 36 of the ratchet wheel can dip into this gap, as shown in FIG. 17.
  • the switching wheel is not raised to the switchable position and it spins freely without detecting the cross pin 14.
  • the base body 58 of the base part is angled inwards twice at its two ends and accommodates the holding web 59 of the slide plate 26 already mentioned.
  • This retaining web is provided near its ends with holes for the shafts of the fastening screws 61, 62 to pass through.
  • These screws each have a collar 63 or 64 on their shank, which lies when the screws are screwed into the door on the edges of the respective bore in the holding web 59 and thus presses this holding web against the door.
  • the retaining web 59 is provided with slightly projecting, resiliently angled resilient ends 69 and 70.
  • the retaining web assumes the position 59 'shown in dashed lines in FIG. 19, in which said spring ends 69 and 70 rest on the inwardly angled edges 71 and 72 of the base body 58.
  • the bundles of the two screws 61 and 62 then also take the dashed layers 63 'and 64'.
  • the screws 61 and 62 provided with the collars 63 and 64 are inserted into the openings in the base body 58 through keyhole-like extensions (not shown).
  • Fig. 20 the locking pin 65 already mentioned in the discussion of Figs. 11 and 14 is shown, which is inserted through the square openings 30 in the opposite walls of the housing 9 and with its head 66 rests on the one housing wall, while the one on his other end protruding from the housing Cross hole 67 a padlock can be introduced.
  • This cross bolt is then in the way of the sector-like projection on each of the two control levers 39 and 40 and thus prevents their switching.
  • This adjustment of the actuating lever ensures that the actuating part 21 screwed to a door can be fully pushed in by the movement of the door in the direction of the safety switch without the cross pin 14 being gripped by the switching wheel 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Lock And Its Accessories (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
EP89109997A 1988-06-10 1989-06-02 Sicherheitsschalter Expired - Lifetime EP0345656B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3819753 1988-06-10
DE3819753A DE3819753A1 (de) 1988-06-10 1988-06-10 Sicherheitsschalter

Publications (3)

Publication Number Publication Date
EP0345656A2 EP0345656A2 (de) 1989-12-13
EP0345656A3 EP0345656A3 (de) 1991-04-03
EP0345656B1 true EP0345656B1 (de) 1994-12-07

Family

ID=6356258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109997A Expired - Lifetime EP0345656B1 (de) 1988-06-10 1989-06-02 Sicherheitsschalter

Country Status (3)

Country Link
EP (1) EP0345656B1 (enrdf_load_stackoverflow)
DE (2) DE3819753A1 (enrdf_load_stackoverflow)
ES (1) ES2067498T3 (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3943375C2 (de) * 1989-12-30 1997-08-21 Kloeckner Moeller Gmbh Schalter mit Antriebskopf
DE4031348A1 (de) * 1990-10-04 1991-04-11 Kronenberg Gmbh H & J Sicherheitsschalter
DE4039652C1 (en) * 1990-12-12 1992-03-05 Kloeckner-Moeller Gmbh, 5300 Bonn, De Detachable safety-interlock for electrical switch - has key guides chamfered to facilitate final engagement with coded cam
DE4111150A1 (de) * 1991-04-06 1992-10-08 Kronenberg Gmbh H & J Sicherheitsschalter
EP0645789B1 (de) * 1993-09-21 1997-10-08 Hans & Jos. Kronenberg GmbH Positionsschalter
DE19504744A1 (de) * 1995-02-14 1996-09-12 Schmersal K A Gmbh & Co Sicherheitsschalter
DE29720862U1 (de) * 1997-11-25 1998-01-15 Hans Bernstein Spezialfabrik für Schaltkontakte GmbH & Co, 32457 Porta Westfalica Sicherheitsschalter
GB0405543D0 (en) 2004-03-10 2004-04-21 Eja Ltd Switch mechanism
CN103515158B (zh) * 2012-06-25 2015-08-12 李树民 10kv高压弹力开关
IT201700077432A1 (it) * 2017-07-10 2019-01-10 Astra S R L Contatto elettrico di sicurezza con azionamento mediante chiave di azionamento asportabile

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3302631C2 (de) * 1983-01-27 1985-02-07 Hans & Jos. Kronenberg Gmbh, 5060 Bergisch Gladbach Sicherheitsschalter mit Fehlschließsicherung
DE3322292C2 (de) * 1983-06-21 1986-03-27 Hans & Jos. Kronenberg Gmbh, 5060 Bergisch Gladbach Sicherheitsschalter mit Fehlschließsicherung
DE3330109C2 (de) * 1983-08-20 1986-01-02 K.A. Schmersal Gmbh & Co, 5600 Wuppertal Elektrischer Schalter
DE3433048C2 (de) * 1984-09-08 1986-10-02 K.A. Schmersal Gmbh & Co, 5600 Wuppertal Elektrischer Schalter

Also Published As

Publication number Publication date
DE3819753A1 (de) 1989-12-14
DE58908715D1 (de) 1995-01-19
ES2067498T3 (es) 1995-04-01
EP0345656A3 (de) 1991-04-03
DE3819753C2 (enrdf_load_stackoverflow) 1990-05-31
EP0345656A2 (de) 1989-12-13

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