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EP0014741B1 - Switch device for actuating switch contacts - Google Patents

Switch device for actuating switch contacts Download PDF

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Publication number
EP0014741B1
EP0014741B1 EP79104542A EP79104542A EP0014741B1 EP 0014741 B1 EP0014741 B1 EP 0014741B1 EP 79104542 A EP79104542 A EP 79104542A EP 79104542 A EP79104542 A EP 79104542A EP 0014741 B1 EP0014741 B1 EP 0014741B1
Authority
EP
European Patent Office
Prior art keywords
switching device
switching
cam
contacts
cams
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
Application number
EP79104542A
Other languages
German (de)
French (fr)
Other versions
EP0014741A1 (en
Inventor
Dirk Dr.-Ing. Rotthaus
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.)
Mannesmann Demag AG
Original Assignee
Mannesmann Demag AG
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 Mannesmann Demag AG filed Critical Mannesmann Demag AG
Priority to AT79104542T priority Critical patent/ATE1080T1/en
Publication of EP0014741A1 publication Critical patent/EP0014741A1/en
Application granted granted Critical
Publication of EP0014741B1 publication Critical patent/EP0014741B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/62—Contacts actuated by radial cams
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H01H19/14—Operating parts, e.g. turn knob
    • H01H19/18—Operating parts, e.g. turn knob adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H19/183—Operating parts, e.g. turn knob adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift adapted for operation by the simultaneous action of two cam plates, rotating at different speeds

Definitions

  • the invention relates to a switching device for actuating switching contacts after a predetermined number of revolutions of a drive shaft which engages via gearwheels with at least two cam disks provided with switching points, which are arranged on camshafts and which are connected to one another via a transmission gear and whose switching points are tiltable Rocker arms act when a switch contact actuates a switch contact.
  • a coarse cam disc determines the time range and a fine cam disc the time of the switching.
  • the role of a plunger lies on the recessed part of the fine cam, and the switching element lies with its contact on the contact of the plunger. If the fine cam disc is now rotated and the roller of the tappet reaches the projecting area of the fine cam disc, jamming occurs because the tappet, which is designed as a joint, is a two-armed lever with one arm and with this arm, the roller of which rests on the coarse cam disc a fixed pivot is stored. The contacts prevent a further approach between the bumps and the switching element.
  • the object of the invention is therefore to design a switching device for actuating switching contacts after a predetermined number of revolutions of a drive shaft so that the switching takes place reliably and that the switching time is also long enough to safely execute the switching command.
  • Such devices are e.g. required for hoists, processing machines and the like in order to make path-dependent switching on or off before reaching end stops.
  • the rocker arm can also be raised and lowered from the switching points of the cam disks and is connected to the switching contacts via a push rod and, if appropriate, a plunger.
  • the slowly rotating cam disc has a rest point and the fast rotating one has a button of sufficient length, e.g. 45 ° central angle for performing the shift with the required switching time.
  • the switching process only takes place when the rocker arm is held in the switching position by the locking point and the locking surface at the same time. After a further rotation of the rapidly rotating cam disc, the locking point of the slowly rotating cam disc is no longer under the rocker arm, which is then only lifted on one side by the button of the rapidly rotating cam disc, which does not lead to an effective displacement of the switching contacts.
  • the cam disks have run-on surfaces and the rocker arm can have rollers and can be acted upon by a spring towards the cam disks. It mainly presses on the slowly rotating cam. When the contacts are closed, there may be a space between the push rod and the plunger of the switching contacts, which allows the rocker arm to swing ineffectively when lifting on one side.
  • the gearbox of the switching device is adapted to the needs and has e.g. a gear ratio of 20: 1; with this difference it drives the camshafts arranged parallel to one another with the cam disks aligned thereon.
  • two or more cam disks can be arranged coaxially to one another and at a distance from one another on each camshaft, the distance being determined by the thickness of the switching elements, taking into account gaps.
  • Figures 1 and 2 show two switching elements 1 provided with switching contacts 15 on a mounting plate 2. This is fastened to a base plate 3 and has bores 2a for guiding push rods 5 which carry rocker arms 7 provided with rollers 9 via rotary bearings 8. These are always with springs 16 kept a short distance from the cam disks 10 and 11.
  • the rollers 9 rest on the run-up surfaces 10b and 11 and on the buttons 10a and the locking points 11a when they are in the operative position.
  • the buttons 10a and the adjoining run-up surfaces 10b are parts of the rapidly rotating cam disks 10.
  • the buttons 10a each extend over an arc of approximately 45 °.
  • the slowly rotating cam disks 11 have distinctive locking points 11 a.
  • Fig. 1 shows the switching device in the switching position, i. that is, the rollers of the rocker arms 7 lie on the buttons 10a and the locking points 11 and hold the push rods 5 and the plunger 4 with their switching contacts 15 in the open position shown in broken lines.
  • the closed position of the switch contacts 15 is shown by a dash-dotted line.
  • the plunger 4 are always acted upon by springs 17 in the closed position of the switching contacts 15, so that the contacts are actually closed when the buttons and locking points retreat. If a rocker arm has only been actuated by one of its two positions, the push rod 5 is not moved because there is a space between the plunger 4 and the push rod 5 in the rest position.
  • FIG. 2 shows the power transmission from the drive shaft 13 reduced to the camshaft 12 of the rapidly rotating cam disk 10 and via the transmission gear 14 with its various gears, some of which are not shown, to the camshaft 12a of the slowly rotating cam disk 11.

Landscapes

  • Valve Device For Special Equipments (AREA)
  • Gears, Cams (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Transmission Devices (AREA)

Abstract

Apparatus is provided for the positive activation of a switching device operated to function after a predetermined number of revolutions of a drive shaft to deactivate a drive prior to the apparatus reaching a stopping point, such as in finishing machines. Two camshafts are provided, with one driven slowly and one driven rapidly through appropriate gearing from the drive shaft of the apparatus. One or more cams are spaced on each camshaft with the slow cams having a short actuating surface and the fast cams having a long activating surface. Each slow and fast activating surface engages, respectively, one end of a toggle lever, which in turn moves a thrust rod to open the switch. Each toggle lever must be engaged simultaneously with a short and a long activating surface to activate the switch.

Description

Die Erfindung betrifft eine Schalteinrichtung zum Betätigen von Schaltkontakten nach einer vorbestimmten Anzahl von Umdrehungen einer Antriebswelle, die über Zahnräder mit mindestens zwei mit Schaltstellen versehenen, auf Nockenwellen angeordneten Nockenscheiben in Eingriff steht, die über ein Übersetzungsgetriebe miteinander in Verbindung stehen und deren Schaltstellen auf einen neigbaren Kipphebel wirken, bei einer bestimmten Stellung zueinander einen Schaltkontakt betätigt.The invention relates to a switching device for actuating switching contacts after a predetermined number of revolutions of a drive shaft which engages via gearwheels with at least two cam disks provided with switching points, which are arranged on camshafts and which are connected to one another via a transmission gear and whose switching points are tiltable Rocker arms act when a switch contact actuates a switch contact.

Bei einer bekannten Schalteinrichtung (DE-AS 21 35 837) bestimmt eine Grobnockenscheibe den Zeitbereich und eine Feinnockenscheibe den Zeitpunkt der Schaltung. Die Rolle eines Stößels liegt an dem zurückspringenden Teil der Feinnockenscheibe, und das Schaltelement liegt mit sinem Kontakt am Kontakt des Stößels. Wenn nun die Feinnockenscheibe gedreht wird und die Rolle des Stößels gelangt auf den vorspringenden Bereich der Feinnockenscheibe, kommt es zu Verklemmungen, da der als Gelenk ausgebildete Stößel mit einem Arm ein zweiarmiger Hebel ist und mit diesem Arm, dessen Rolle an der Grobnockenscheibe anliegt, auf einem festen Drehpunkt gelagert ist. Die Kontakte verhindern eine weitere Annäherung zwischen dem Stößen und dem Schaltelement. Selbst wenn der Drehpunkt nachgeben würde, wäre der Kontakt während aller Umdrehungen der Feinnockenscheibe geschlossen, bis die Rolle des Stößels nicht mehr am vorspringenden Teil der Grobnockenscheibe anliegt, d.h. der Kontakt ist etwa während 1/3 der gesamten Betriebszeit geschlossen. Ein solches Schaltelement ist mangels eines exakten Schaltzeitpunktes nur begrenzt einsetzbar.In a known switching device (DE-AS 21 35 837) a coarse cam disc determines the time range and a fine cam disc the time of the switching. The role of a plunger lies on the recessed part of the fine cam, and the switching element lies with its contact on the contact of the plunger. If the fine cam disc is now rotated and the roller of the tappet reaches the projecting area of the fine cam disc, jamming occurs because the tappet, which is designed as a joint, is a two-armed lever with one arm and with this arm, the roller of which rests on the coarse cam disc a fixed pivot is stored. The contacts prevent a further approach between the bumps and the switching element. Even if the pivot point gave way, the contact would be closed during all revolutions of the fine cam disc until the roller of the tappet no longer abuts the projecting part of the coarse cam disc, i.e. the contact is closed for about 1/3 of the total operating time. Such a switching element can only be used to a limited extent due to the lack of an exact switching time.

Bei einer Schalteinrichtung (DE-AS 2347581) wird die Stellung der Nockenscheiben zueinander durch unterschiedliche Zähnezahlen ihrer Zahnräder verändert. Das Schalten erfolgt beim Nebeneinanderliegen der Schaltstellen. Da diese in Umfangsrichtung kurz sein müssen, ist auch die Schaltzeit kurz. Dadurch besteht die Gefahr, daß bei schnelleren Umdrehungen die Schaltzeit nicht ausreicht, um den Schaltvorgang zuverlässig zu bewirken. Eine Verlängerung der Schaltstellen in Umfangsrichtung ist nicht möglich, weil diese sich bei zwei aufeinanderfolgenden Umdrehungen noch teilweise überdecken, so daß es zu einer Fehlschaltung kommt.In a switching device (DE-AS 2347581), the position of the cam disks relative to one another is changed by different numbers of teeth on their gear wheels. Switching takes place when the switching points are next to each other. Since these must be short in the circumferential direction, the switching time is also short. As a result, there is a risk that the shifting time will not be sufficient for faster revolutions to reliably effect the shifting process. An extension of the switching points in the circumferential direction is not possible because they still overlap partially in two successive revolutions, so that there is an incorrect switching.

Aufgabe der Erfindung ist es daher, eine Schalteinrichtung zum Betätigen von Schaltkontakten nach einer vorbestimmten Anzahl von Umdrehungen einer Antriebswelle so zu gestalten, daß die Schaltung zuverlässig erfolgt und daß auch die Schaltzeit genügend lang ist, um den Schaltbefehl sicher zur Ausführung kommen zu lassen. Derartige Einrichtungen sind z.B. bei Hebezeugen, Bearbeitungsmaschinen und dergleichen erforderlich, um wegabhängige Ein- oder Ausschaltungen vor dem Erreichen von Endanschlägen vorzunehmen.The object of the invention is therefore to design a switching device for actuating switching contacts after a predetermined number of revolutions of a drive shaft so that the switching takes place reliably and that the switching time is also long enough to safely execute the switching command. Such devices are e.g. required for hoists, processing machines and the like in order to make path-dependent switching on or off before reaching end stops.

Die genannte Aufgabe wird dadurch gelöst, daß der Kipphebel von den Schaltstellen der Nockenscheiben auch heb- und senkbar ist und über eine Schubstange und gegebenenfalls einen Stößel mit den Schaltkontakten in Verbindung steht. Die sich langsam drehende Nockenscheibe hat eine Raststelle und die sich schnell drehende eine Schaltfläche von ausreichender Länge von z.B. 45° Zentriwinkel zum Durchführen der Schaltung mit der erforderlichen Schaltzeit. Nur wenn der Kipphebel von der Raststelle und der Rastfläche gleichzeitig in Schaltstellung gehalten wird, erfolgt der Schaltvorgang. Nach einer weiteren Umdrehung der sich schnell drehenden Nockenscheibe steht die Raststelle der sich langsam drehenden Nockenscheibe nicht mehr unter dem Kipphebel, der dann nur von der Schaltfläche der sich schnell drehenden Nockenscheibe einseitig angehoben wird, was nicht zum wirksamen Verschieben der Schaltkontakte führt. Die Nockenscheiben haben Auflaufflächen und der Kipphebel kann Rollen haben und von einer Feder zu den Nockenscheiben hin beaufschlagt sein. Sie drückt dabei überwiegend auf die sich langsam drehende Nockenscheibe. Bei geschlossenen Kontakten kann zwischen der Schubstange und dem Stößel der Schaltkontakte ein Zwischenraum vorhanden sein, der ein wirkungsloses Pendeln des Kipphebels beim einseitigen Heben zuläßt.The stated object is achieved in that the rocker arm can also be raised and lowered from the switching points of the cam disks and is connected to the switching contacts via a push rod and, if appropriate, a plunger. The slowly rotating cam disc has a rest point and the fast rotating one has a button of sufficient length, e.g. 45 ° central angle for performing the shift with the required switching time. The switching process only takes place when the rocker arm is held in the switching position by the locking point and the locking surface at the same time. After a further rotation of the rapidly rotating cam disc, the locking point of the slowly rotating cam disc is no longer under the rocker arm, which is then only lifted on one side by the button of the rapidly rotating cam disc, which does not lead to an effective displacement of the switching contacts. The cam disks have run-on surfaces and the rocker arm can have rollers and can be acted upon by a spring towards the cam disks. It mainly presses on the slowly rotating cam. When the contacts are closed, there may be a space between the push rod and the plunger of the switching contacts, which allows the rocker arm to swing ineffectively when lifting on one side.

Das Übersetzungsgetriebe der Schalteinrichtung ist den Bedürfnissen angepaßt und hat z.B. ein Übersetzungsverhältnis von 20:1; es treibt mit dieser Differenz die parallel zueinander angeordneten Nockenwellen mit den darauf fluchtend zueinander angeordneten Nockenscheiben an. Je nach Aufbau der Schaltung können den Anforderungen entsprechend auf jeder' Nockenwelle zwei oder mehr Nockenscheiben koaxial zueinander und mit Abstand voneinander angeordnet sein, wobei der Abstand von der Dicke der Schaltelemente unter Berücksichtigung von Zwischenräumen bestimmt ist.The gearbox of the switching device is adapted to the needs and has e.g. a gear ratio of 20: 1; with this difference it drives the camshafts arranged parallel to one another with the cam disks aligned thereon. Depending on the structure of the circuit, two or more cam disks can be arranged coaxially to one another and at a distance from one another on each camshaft, the distance being determined by the thickness of the switching elements, taking into account gaps.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und im folgenden erläutert. Es zeigt

  • Fig. 1 eine Stirnansicht mit Teilschnitten von der Schalteinrichtung.
  • Fig. 2 die Seitenansicht von Fig. 1 mit Teilschnitten.
An embodiment of the invention is shown in the drawing and explained below. It shows
  • Fig. 1 is an end view with partial sections of the switching device.
  • Fig. 2 shows the side view of Fig. 1 with partial sections.

Die Figuren 1 und 2 zeigen zwei mit Schaltkontakten 15 versehene Schaltelemente 1 auf einer Montageplatte 2. Diese ist an einer Grundplatte 3 befestigt und hat Bohrungen 2a zur Führung von Schubstangen 5, die über Drehlager 8 mit Rollen 9 versehene Kipphebel 7 tragen. Diese werden von Federn 16 stets mit geringem Abstand zu den Nockenscheiben 10 und 11 gehalten. Die Rollen 9 liegen an den Auflaufflächen 10b and 11 sowie an den Schaltflächen 10a und den Raststellen 11 a an, wenn diese in Wirkstellung sind. Die Schaltflächen 10a und die sich daran anschließenden Auflaufflächen 10b sind Teile der sich schnell drehenden Nockenscheiben 10. Die Schaltflächen 10a erstrecken sich jeweils über einen Bogen von etwa 45°. Die sich langsam drehenden Nockenscheiben 11 haben markante Raststellen 11 a.Figures 1 and 2 show two switching elements 1 provided with switching contacts 15 on a mounting plate 2. This is fastened to a base plate 3 and has bores 2a for guiding push rods 5 which carry rocker arms 7 provided with rollers 9 via rotary bearings 8. These are always with springs 16 kept a short distance from the cam disks 10 and 11. The rollers 9 rest on the run-up surfaces 10b and 11 and on the buttons 10a and the locking points 11a when they are in the operative position. The buttons 10a and the adjoining run-up surfaces 10b are parts of the rapidly rotating cam disks 10. The buttons 10a each extend over an arc of approximately 45 °. The slowly rotating cam disks 11 have distinctive locking points 11 a.

Fig. 1 zeigt die Schalteinrichtung in der Schaltstellung, d. h., die Rollen der Kipphebel 7 liegen auf den Schaltflächen 10a und den Raststellen 1 1 und halten die Schubstangen 5 und die Stößel 4 mit ihren Schaltkontakten 15 in der gestrichelt gezeichneten, geöffneten Stellung. Die geschlossene Stellung der Schaltkontakte 15 ist durch eine strichpunktierte Linie dargestellt. Die Stößel 4 werden von Federn 17 stets in Schließstellung der Schaltkontakte 15 beaufschlagt, so daß die Kontakte beim Zurückweichen der Schaltflächen und Raststellen tatsächlich geschlossen sind. Wenn ein Kipphebel nur von einem seiner beiden Schatstellen betätigt wurde, wird die Schubstange 5 nicht bewegt, da in Ruhestellung zwischen dem Stößel 4 und der Schubstange 5 ein Zwischenraum vorhanden ist.Fig. 1 shows the switching device in the switching position, i. that is, the rollers of the rocker arms 7 lie on the buttons 10a and the locking points 11 and hold the push rods 5 and the plunger 4 with their switching contacts 15 in the open position shown in broken lines. The closed position of the switch contacts 15 is shown by a dash-dotted line. The plunger 4 are always acted upon by springs 17 in the closed position of the switching contacts 15, so that the contacts are actually closed when the buttons and locking points retreat. If a rocker arm has only been actuated by one of its two positions, the push rod 5 is not moved because there is a space between the plunger 4 and the push rod 5 in the rest position.

Die Figur 2 zeigt die Kraftübertragung von der Antriebswelle 13 reduziert zur Nockenwelle 12 der sich schnell drehenden Nockenscheibe 10 und über das Übersetzungsgetriebe 14 mit seinen verschiedenen, zum Teil nicht gezeichneten Zahnrädern zur Nockenwelle 12a der sich langsam drehenden Nockenscheibe 11.FIG. 2 shows the power transmission from the drive shaft 13 reduced to the camshaft 12 of the rapidly rotating cam disk 10 and via the transmission gear 14 with its various gears, some of which are not shown, to the camshaft 12a of the slowly rotating cam disk 11.

Claims (12)

1. Switching device for actuating contacts (15) as a function of a preset number of revolutions of a drive shaft (13) meshing via gearings having at least two switch points (10a, 11 a) with plate cams (10, 11) arranged on cam shafts (12, 12a) connected to each other by a transmission gear (14) and whereof the switch points (10a, 11a) act onto an inclinable rocker (7) which, when the switch points (10a, 11a) are at a certain position in relation to each other, will actuate the contacts (15) for the switching operation, characterized by the rocker (7) being likewise raisable and lowerable at the switch points (10a, 11a) of the plate cams (10, 11) and connected to the contacts (15) with the aid of a rod (5) and possibly a tappet (4).
2. Switching device to Claim 1 characterized by the plate cam (11) on the slowly rotating cam shaft (12a) having as switch point a stop (11a) and the plate cam (10) on the quickly rotating cam shaft (12) having as switch point a surface (10a).
3. Switching device to Claim 2 characterized by the switching surface (10a) having a centric angle of about 45°.
4. Switching device to Claim 2 characterized by the plate cams (10, 11) having run-up faces (10b, 11 b) to switching surface (1 Oa) or to switching stop (11 a).
5. Switching device to Claim 1 characterized by the rocker (7) featuring guide rollers (9) at the plate cams (10, 1 1
6. Switching device to Claim 1 characterized by the rocker (7) being constantly loaded by spring (16) towards the plate cams (10, 11).
7. Switching device to Claim 6 characterized by the spring (16) mostly pressing the rocker (7) against the slowly rotating plate cam (11). ).
8. Switching device to Claim 1 characterized by a gap being available between connecting rod (5) and tappet (4) when the contacts (15) are closed.
9. Switching device to Claim 1 characterized by the transmission gear (14) having a large step up ratio such as, for example, 20: 1.
10. Switching device to Claim 1 characterized by the cam shafts (12, 12a) featuring plate cams (10, 11) being arranged parallel to each other.
11. Switching device to Claim 10 characterized by the plate cams (10, 11) being arranged on the cam shafts in line to each other.
12. Switching device to one or more of the aforestated Claims characterized by each of the cam shafts (12, 12a) having two or more plate cams (10, 11) in coaxial and spaced arrangement.
EP79104542A 1979-02-08 1979-11-16 Switch device for actuating switch contacts Expired EP0014741B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79104542T ATE1080T1 (en) 1979-02-08 1979-11-16 SWITCHING DEVICE FOR ACTIVATING SWITCHING CONTACTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2904681A DE2904681C3 (en) 1979-02-08 1979-02-08 Switching device for actuating switching contacts
DE2904681 1979-12-08

Publications (2)

Publication Number Publication Date
EP0014741A1 EP0014741A1 (en) 1980-09-03
EP0014741B1 true EP0014741B1 (en) 1982-05-19

Family

ID=6062396

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104542A Expired EP0014741B1 (en) 1979-02-08 1979-11-16 Switch device for actuating switch contacts

Country Status (4)

Country Link
US (1) US4307269A (en)
EP (1) EP0014741B1 (en)
AT (1) ATE1080T1 (en)
DE (1) DE2904681C3 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3011706C2 (en) * 1980-03-26 1982-04-15 Elero Antriebs- und Sonnenschutztechnik GmbH & Co KG, 7312 Kirchheim Shaft limit switch
DE3445675A1 (en) * 1984-12-14 1986-06-19 Mannesmann AG, 4000 Düsseldorf SWITCHING DEVICE
USRE37417E1 (en) 1988-08-09 2001-10-23 Tetron, Inc. Vortex inhibitor for molten metal discharge
US4871148A (en) * 1988-08-09 1989-10-03 Tetron, Inc. Vortex inhibitor for molten metal discharge
DE3837536C1 (en) * 1988-11-04 1990-02-15 Man Ghh Krantechnik Gmbh, 7100 Heilbronn, De Rotation limit switch having a double spindle drive
FR2688022B1 (en) * 1992-02-28 1994-05-20 Somfy AUTOMATIC STOPPING DEVICE FOR THE ELECTRIC MOTOR DRIVE OF DOOR, SHUTTER, STORE OR THE LIKE.
US6074598A (en) * 1998-06-15 2000-06-13 Tetron, Inc. Method and apparatus for slag separation sensing
FR2842940B1 (en) * 2002-07-29 2005-02-04 Somfy AUTOMATIC STOP DEVICE FOR DRIVING A SOLAR PROTECTION, OCCULTATION OR CLOSURE ELEMENT

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE196116C (en) *
US2389350A (en) * 1942-08-06 1945-11-20 Westinghouse Electric Corp Limit switch
DE1095921B (en) * 1959-09-03 1960-12-29 Siemens Ag Copier
AT223263B (en) * 1959-09-03 1962-09-10 Siemens Ag Copier
AT306966B (en) * 1970-07-31 1973-05-10 Waagner Biro Ag High resolution switch
DE2347581B2 (en) * 1973-09-21 1978-03-23 Johannes Lock Windenfabrik U. Maschinenbau, 7943 Ertingen Switching device with actuation after a predetermined number of revolutions

Also Published As

Publication number Publication date
ATE1080T1 (en) 1982-06-15
EP0014741A1 (en) 1980-09-03
DE2904681B2 (en) 1981-01-22
DE2904681C3 (en) 1981-09-03
US4307269A (en) 1981-12-22
DE2904681A1 (en) 1980-08-14

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