US3718784A - Vehicle direction switch with automatic return and headlight dimmer control - Google Patents

Vehicle direction switch with automatic return and headlight dimmer control Download PDF

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Publication number
US3718784A
US3718784A US00045490A US3718784DA US3718784A US 3718784 A US3718784 A US 3718784A US 00045490 A US00045490 A US 00045490A US 3718784D A US3718784D A US 3718784DA US 3718784 A US3718784 A US 3718784A
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United States
Prior art keywords
rotor
movement
base
relative
slider
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
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US00045490A
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English (en)
Inventor
N Wilkinson
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries Ltd
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Filing date
Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/34—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction
    • B60Q1/40—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction having mechanical, electric or electronic automatic return to inoperative position
    • B60Q1/42—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction having mechanical, electric or electronic automatic return to inoperative position having mechanical automatic return to inoperative position due to steering-wheel position, e.g. with roller wheel control
    • B60Q1/425—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating change of drive direction having mechanical, electric or electronic automatic return to inoperative position having mechanical automatic return to inoperative position due to steering-wheel position, e.g. with roller wheel control using a latching element for resetting a switching element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1446—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means controlled by mechanically actuated switches
    • B60Q1/1453—Hand actuated switches
    • B60Q1/1461—Multifunction switches for dimming headlights and controlling additional devices, e.g. for controlling direction indicating lights
    • B60Q1/1469—Multifunction switches for dimming headlights and controlling additional devices, e.g. for controlling direction indicating lights controlled by or attached to a single lever, e.g. steering column stalk switches

Definitions

  • An electrical switch including a base having a rotor mounted for angular movement thereon.
  • a first set of electrical contacts is operable by angular movement of the rotor relative to the base, and an operating lever is pivotally mounted on the rotor for movement relative to the rotor about an axis at right anglesto the axis of movement of the rotor.
  • the lever is coupled to a slider capable of sliding movement relative to the base, and further electrical contacts are operable by the slider in response to sliding movement thereof.
  • the operating lever is coupled to the slider in such a mannerthat movement of the lever in a direction parallel to its pivot axis takes place relative to the slider, and so moves the rotor relative to the base to operate the first set of contacts.
  • FIG. 6 is a partly diagrammatic viewin thedirection- VEHICLE DIRECTION SWITCH WITH AUTOMATIC RETURN AND HEADLIGHT DIMMER CONTROL This invention relates to electrical switches for road vehicles.
  • a switch includes a base, a rotor mounted for angular movement on the base, a first set of electrical contacts-operable by movement of the rotor relative to the base, an operating lever pivotally mounted on the rotor for movement relative to the rotor-about an axis generally at right angles to the axis of movement of the rotor relative to the base, a slider mounted on the base for sliding movement relative thereto in a direction generally parallel with the axis about which the rotor can move, and a second set of contacts operable by movement of the slider relative tothe base, the operating lever being coupledto said slider in such a manner that pivotal movement of the lever relative to the rotor moves said slider while moveof the switch shown in FIG. 1,
  • FIG. 3A is a fragmentary'view illustrating an alternative arrangement to that shown in FIG. 3.
  • FIG. 4 is a diagrammatic side elevational view of the switch shown in FIG. 1,
  • FIG. 5 is a plan view of a part of the switch shown in of arrow A in FIG. 5. I I I
  • the switch includes a moulded synthetic resin body 11 which is adapted at 12 to be securedto the stationary outer part of the steering column of a road vehicle.
  • the body 11 defines a collar which encircles the stationary outer part of the steering column of the road vehicle, and rotatably mounted on the body 11 is a moulded synthetic resin striker sleeve 13, the striker sleeve 13 being keyed to the rotatable part of the steering column, so as to rotate therewith;
  • a moulded synthetic resin rotor 14 mounted for rotation on the body 11 at about an axis parallel to the axis of the sleeve 13 is a moulded synthetic resin rotor 14 to. which is pivotally connected an operating lever 15.
  • The'operating lever 15 extends outwardly from the switch, and is pivotally connected to the rotor 14 for movementabout an axis at right angles to the pivotal axis of the rotor 14, the innermost end of the lever 15 being received ina pivot piece 16 coupled to the rotor 14 for said pivotal movement.
  • First and second sets of contacts 18,19 are operable in response to movement ofthe rotor,'relative'to the body 11, the contacts 18,19 being independent of one another and serving difierent functions in use.
  • The'contacts 18 control the direction indicator function of the vehicle utilizing the switch and the contacts 19 control parking light function of the vehicle.
  • the rotor has three stable positions relative to the body 11, a first, central position wherein neither the contacts 18 nor the contacts 19 are operated, a second, operative position achieved by moving the rotor 14 relative to the body 11 in one angular direction, to complete, in use, the circuits to the direction indicator lamps on one side of the vehicle through the contacts 18, and a third, operative position achieved by moving the rotor in the opposite angular direction from its central position and wherein the contacts 18 are operated to complete the circuits to the direction indicator lamps on the opposite side of vehicle.
  • the rotor 14 is formed with a first radially extending bore 21 which houses a compression spring 22 urging a ball 23 into engagement with a cam track 24 formed on a wall of the body 11.
  • the cam track 24 includes three angularly spaced depressions, the ball 23 and the cam track 24 constituting detent means defining the first, second and third stable positions of the rotor 14 relative to the body 11.
  • Movement of the rotor 14 relative to the body 11 to either of its second and third positions causes the ball 23 to ride from the central depressionof the cam track 24 into one or other of the outermost depressions of the vcam'track 24, and moves one or other of the legs 17 into the path of movement of a striker (not shown) on the outer surface of the sleeve 13.
  • the contacts 18 are used to control the direction indicator lamps on opposite sides respectivelyof the vehicle, and during rotation of the steering wheel of the vehicle in a direction to negotiate the turn indicated when the rotor is in its second or third position, then the striker on the sleeve 13 engages the leg 17 which is in its path of movement, and flexes'the leg outwardly to permit the striker to pass.
  • the striker engages the outer surface of the respective leg 17, and flexes the leg 17 against a stop on the rotor 14, whereafter further flexure of the leg 17 is resisted.
  • the force exerted on theend of the leg 17 by the striker in returning the steering wheel to its straight ahead position, creates a turning moment about the pivotal axis of the rotor 14, and returns the rotor 14 to its central position wherein the contacts 18 are inoperative, and the leg 17 is out path of movement of the striker.
  • the contacts 18 are arranged to be operated during the movement of the rotor 14 from its central position to either of its second or third operative positions, and before the rotor 14 reaches said operative positions.
  • the rotor 14 is formed with a second radially extending bore 25 which houses a compression spring 26 urging a further ball 27 into a channel 28 in the wall of the body 11.
  • the ball 27 is adjacentthemid-point of the channel 28, and the length of the channel 28 is shorterv than the distance between the outermost depressions of the cam track 24.
  • the flasher unit which causes flashing of the direction indicator lamps of the vehicle is carried by the body 11 and is plugged into a printed circuit board on the body 11, the printed circuit board completing the circuit between the unit and the contacts 18.
  • the switch is provided with a metal cover plate 29 which extends parallel with the body 11, and which constitutes a second journal for the sleeve 13 and the pivot piece 14.
  • a slider 31 Slidably mounted in the plate 29 and the body 11, and extending generally at right angles to the body 11 is a slider 31 (FIGS. and 6 which is of arcuate cross-section. Intermediate its ends the slider 31 is formed with a transversely extending elongated slot 32 through which the lever extends, and at its end remote from the plate 29 the slider 31 is formed with three parallel, integral fingers 33,34,35 respectively.
  • the fingers 33,35 extend through respective passages in the body 11, and serve to locate the lower end of the slider 31 for sliding movement in the body 11, the upper end of the slider 31 being received in a slot in the plate 29, the body 11 and the plate 29 supporting the slider 31 against movement other than in a direction generally parallel with the pivotal axis of the rotor 14.
  • the finger 34 of the slider 31 is resilient, and extends through an aperture in the body 11 with clearance.
  • the face of the finger 34 presented towards the rotor 14 is formed with a pair of transversely extending grooves 36,37 which are spaced apart by a conical, transversely extending rib 38, and the surface of the slider 31 containing the grooves 36,37 is engaged by a relatively rigid projection 39 integral with the body, 11.
  • the arrangement is such that the finger 34 is stressed into engagement with the projection 39 upon assembly of the switch, with the projection 39 engaged in one or other of the grooves 36,37 of the finger 34.
  • the opposite longer walls of the slots 32 in the slider 31 grip the lever 15, so that the slider 31 is moved in a direction parallel with the pivotal axis of the rotor 14 by movement of the lever 15 about its pivotal axis relative to the rotor 14.
  • the longer walls of the slots 32 are relieved, so that they make substantially only linecontact with the lever 15.
  • the fingers 33,35 of the slider 31 project from the lower surface of the body 11, and are engageable with respective leaf spring contacts 41,42.
  • the leaf spring contacts 41,42 are secured at one end to the body 11, and are engageable at their other ends with respective fixed contacts not shown) also supported by the body 11.
  • the contacts 41,42 together with their respective fixed' contacts are connected in the headlamps circuit of the road vehicle, and control the main beam, dipped beam, and main beam flash facilities of the vehicle, under the action of the fingers 33,35 1
  • the main lighting control switch of the vehicle When the main lighting control switch of the vehicle is in its on position, and the slider 31 is in a position wherein the projection 39 is engaged in the groove 37, then the main beam filaments of the headlamps will be energized.
  • the lever 15 In order to switch off the main beams, and energizethe dipped beam filaments of the headlamps the lever 15 is moved relative to the rotor 14 to move the slider 31 upwardly, and during the upward movement of the slider 31 the projection 39 rides over the rib 38 and into the groove 36, the finger 34 being flexed to permit the rib 38 to pass the projection 39.
  • the fingers 33,35 With the projection 39 engaged in the groove 36, the fingers 33,35 are in such a position that the dipped beam filaments of the headlamps of the vehicle are energized.
  • the grooves 36,37 together with the projection 39 constitute detent means defining the two stable positions of the slider 31 relative to the body 1 1. Further movement of the slider 31 in an upward direction, under theaction of the lever 15, causes the finger 34 to be flexed as the projection 39 rides up the wall of the groove 36 remote from the groove 37. This movement of the slider 31 causes engagement of the leaf spring contact 41 with a feed contact carried by the body 11. The feed contact is not controlled by the main lighting switch, and so when it is engaged by the leaf spring contact 41 the main beam circuit of the headlamps of the vehicle is completed regardless of the position of the main lighting switch.
  • the slider 31 is provided with outwardly directed shoulders 43,44 which are engageable with the cover 29 and the body 11 respectively.
  • the shoulder 43 engages the cover 29 to prevent movement of the slider 31 beyond the main beam flash position
  • the shoulder 44 engages the body 11 during movement of the slider 31 in the opposite direction to prevent movement of the slider beyond the position wherein the projection 39 engages in the groove 37
  • the operating lever is hollow, and is formed from I conductive material, the outer surface of the lever 15 being coated with insulating material. At its end remote from the body llthe operating lever carries a pair of contacts, one of which is electrically connected to the lever 15, and the other one of which is insulated from the lever 15 and connected to an insulating lead which extends within the lever 15.
  • the two contacts at the free end of the lever 15 can be bridged by an operating member which is slidably mounted on the lever 15, and which is urged to a position clear of the contacts by a spring.
  • the two contacts can, in use, be electrically connected in the horn circuit the windscreen washer circuit or a smaller circuit of the vehicle, so that the circuit can be operated by moving the operatingmember relative to the lever 15 against the action of the'spring.
  • the lever 15 is mounted for axial movement relative to the rotor 14 and adjacent the inner end of the lever 15 are a pair of contacts which are operable by the inner end of the lever 15.
  • lever 15 is moved bodily inwardly relative to the body 11, so that the inner end of the lever 15 operates the contacts,
  • the pivot piece 16 is replaced by a pivot pin extending through a slot in the lever.
  • the body 11 and the plate 29 include provision for mounting thereon further switches .for example, for controlling the windscreen wipers the lights and hazard warning. facility of the road vehicle.
  • the further switches would be mounted on the body 11 and/or the plate 29 on the opposite side of the steering column of the vehicle from the rotor 14, with the operating member of, for example, thewindscreen wiper switch extending outwardly from the steering column generally diametrically opposite the operating lever 15.
  • cam track 24 and the channel 28 are formed in the upper surface of the body 11 and the balls 23,27 are spring urged in a vertical 'direction into engagement with the cam track 24 and the channel 28 respectively.
  • the ball 27 is replaced by a synthetic resin plunger which is resiliently urged into a mating channel formed in the body 11, and the plunger can be positioned so as to extend either vertically or radially with respect to the rotor 14.
  • An electrical switch including a base, a rotor, means mounting the rotor for angular movement on the base, a first set of electrical contacts supported by the base, angular movement of the rotor relative to the base operating said first set of contacts, an operating lever, means pivotally mounting the operating lever on the rotor for movement relative to the rotor about an axis generally at right angles to the axis of movement of the rotor relative to the base, a slider, means mounting the slider on the base for sliding movement relative thereto in a direction generally parallel with the axis about which the rotor can move angularly relative to the base, a second set of electrical contacts supported by the base, movement of the slider relative to the base operating said second set of contacts, a fixed detent component carried by the base, a movable detent component carried by said slider and co-operating with the fixed detent component to define operative positions of the slider relative to the base, and, means coupling the operating lever to said slider in such a manner that pivotal movement of the lever relative
  • said plurality of angular positions comprises a first central position wherein no electrical circuits are completed through said first set of electrical contacts a secondposition achieved by moving the rotor in one angular direction from said first position and in which a first electrical circuit is completed through said first set of electrical contacts, and a third position achieved by moving the rotor in the other angular direction from said first position and in which a second electrical circuit is completed through said first set of electrical con- 'tacts.
  • a switch as claimed in claim 4 wherein said first and second electrical circuits are completed during the respective movements of the rotor from the first position, prior to the rotor reaching its second or third positions respectively, and the switch includes means operable during movement of the rotor from its first position to its second position or its third-position, to impart resistance to further movement of the rotor to its first position or its second position, said means being operable at points in the movement of the rotor such that said first circuit or said second circuit is completed, but where upon release of the rotor the rotor will be returned by said detent means to the first position,
  • a switch as claimed in claim 5 wherein said means for imparting resistance to movement of the rotor includes a member movable with the rotor and a channel on the base', said member being resiliently urged into engagement with the .channel and resistance to movement of the rotor being imparted by engagement of said member with either end wall of the channel.
  • a switch-as claimed in claim 4 wherein the rotor carries a pair of resilient arms adapted to be engageable in use in the second and third positions of the rotor respectively by a cancelling striker which rotates with the steering column of the vehicle utilizing the switch, said arms serving to transmit cancelling movement of the striker to the rotor to return the rotor from either of its second and third positions to its first position.
  • a switch as claimed in claim 7 further. including a striker mounted for rotation on the base.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Switches With Compound Operations (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Mechanisms For Operating Contacts (AREA)
US00045490A 1969-06-25 1970-06-11 Vehicle direction switch with automatic return and headlight dimmer control Expired - Lifetime US3718784A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3204569 1969-06-25

Publications (1)

Publication Number Publication Date
US3718784A true US3718784A (en) 1973-02-27

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ID=10332293

Family Applications (1)

Application Number Title Priority Date Filing Date
US00045490A Expired - Lifetime US3718784A (en) 1969-06-25 1970-06-11 Vehicle direction switch with automatic return and headlight dimmer control

Country Status (7)

Country Link
US (1) US3718784A (de)
JP (1) JPS5126038B1 (de)
CS (1) CS160127B2 (de)
DE (1) DE2030246C3 (de)
ES (1) ES160240Y (de)
FR (1) FR2051226A5 (de)
GB (1) GB1318882A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129757A (en) * 1975-07-09 1978-12-12 Lucas Industries Limited Electrical switch assembly
US4142076A (en) * 1976-04-27 1979-02-27 Lucas Industries Limited Electrical switch
US4238650A (en) * 1977-06-21 1980-12-09 Lucas Industries Limited Electrical switch
US4414442A (en) * 1981-05-08 1983-11-08 Leopold Kostal Gmbh & Co. Kg Steering column switch
US5680927A (en) * 1996-09-30 1997-10-28 United Technologies Automotive, Inc. Electrical switch
US20070125631A1 (en) * 2003-12-05 2007-06-07 Valeo Schalter Und Sensoren Gmbh Switch module

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4091372A (en) * 1976-06-04 1978-05-23 Towmotor Corporation Directional control lever and horn actuating arrangement
JP2021064690A (ja) 2019-10-11 2021-04-22 株式会社リコー 素子および素子の製造方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1031759A (en) * 1962-12-20 1966-06-02 Nsf Ltd Improvements in and relating to electric switches
US3284592A (en) * 1965-10-11 1966-11-08 Boyne Products Inc Automatic cancelling turn signal with an intermediate signal position which is manually operable and releasable
US3308427A (en) * 1963-12-02 1967-03-07 Emerson E Hess Passing signal system for motor vehicles
US3334201A (en) * 1964-02-22 1967-08-01 Rau Swf Autozubehoer Steering column switch assembly having additional switch means for light dimming andthe like
US3359384A (en) * 1965-03-26 1967-12-19 Lucas Industries Ltd Directional turn signal switch with cams inclined to the plane of rotation of the striker
US3368043A (en) * 1966-06-15 1968-02-06 Boyne Products Inc Direction signaling apparatus having lane change positions
US3372252A (en) * 1966-10-07 1968-03-05 Boyne Products Inc Direction signaling apparatus
US3374321A (en) * 1965-04-22 1968-03-19 Gen Motors Corp Direction signal and dimmer switch actuator
US3459909A (en) * 1967-09-18 1969-08-05 Essex International Inc Vehicle direction signaling apparatus with abutment means releasably arresting the apparatus in an intermediate position

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1385948A (fr) * 1964-03-11 1965-01-15 Seima Commutateur notamment pour la commande de clignotants sur un véhicule, et véhiculetel qu'automobile équipé du présent commutateur ou similaire
DE1967546U (de) * 1966-12-31 1967-08-31 Bosch Gmbh Robert Schalter fuer mehrere stromkreise der beleuchtungs- und signalanlage von kraftfahrzeugen.
JPS4414750Y1 (de) * 1967-03-22 1969-06-24
DE1655840C3 (de) * 1967-10-28 1973-06-28 Westfaelische Metall Industrie Lenkstockschalter fuer Kraftfahrzeuge

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1031759A (en) * 1962-12-20 1966-06-02 Nsf Ltd Improvements in and relating to electric switches
US3308427A (en) * 1963-12-02 1967-03-07 Emerson E Hess Passing signal system for motor vehicles
US3334201A (en) * 1964-02-22 1967-08-01 Rau Swf Autozubehoer Steering column switch assembly having additional switch means for light dimming andthe like
US3359384A (en) * 1965-03-26 1967-12-19 Lucas Industries Ltd Directional turn signal switch with cams inclined to the plane of rotation of the striker
US3374321A (en) * 1965-04-22 1968-03-19 Gen Motors Corp Direction signal and dimmer switch actuator
US3284592A (en) * 1965-10-11 1966-11-08 Boyne Products Inc Automatic cancelling turn signal with an intermediate signal position which is manually operable and releasable
US3368043A (en) * 1966-06-15 1968-02-06 Boyne Products Inc Direction signaling apparatus having lane change positions
US3372252A (en) * 1966-10-07 1968-03-05 Boyne Products Inc Direction signaling apparatus
US3459909A (en) * 1967-09-18 1969-08-05 Essex International Inc Vehicle direction signaling apparatus with abutment means releasably arresting the apparatus in an intermediate position

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129757A (en) * 1975-07-09 1978-12-12 Lucas Industries Limited Electrical switch assembly
US4142076A (en) * 1976-04-27 1979-02-27 Lucas Industries Limited Electrical switch
US4238650A (en) * 1977-06-21 1980-12-09 Lucas Industries Limited Electrical switch
US4414442A (en) * 1981-05-08 1983-11-08 Leopold Kostal Gmbh & Co. Kg Steering column switch
US5680927A (en) * 1996-09-30 1997-10-28 United Technologies Automotive, Inc. Electrical switch
US20070125631A1 (en) * 2003-12-05 2007-06-07 Valeo Schalter Und Sensoren Gmbh Switch module
US7385152B2 (en) * 2003-12-05 2008-06-10 Valeo Schalter Und Sensoren Gmbh Switch module

Also Published As

Publication number Publication date
GB1318882A (en) 1973-05-31
FR2051226A5 (de) 1971-04-02
DE2030246B2 (de) 1974-02-07
ES160240U (es) 1970-09-16
JPS5126038B1 (de) 1976-08-04
DE2030246C3 (de) 1974-09-05
CS160127B2 (de) 1975-02-28
DE2030246A1 (de) 1971-01-14
ES160240Y (es) 1971-05-16

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