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EP0048302A1 - Interrupteur à action brusque et procédé pour sa fabrication - Google Patents

Interrupteur à action brusque et procédé pour sa fabrication Download PDF

Info

Publication number
EP0048302A1
EP0048302A1 EP80105744A EP80105744A EP0048302A1 EP 0048302 A1 EP0048302 A1 EP 0048302A1 EP 80105744 A EP80105744 A EP 80105744A EP 80105744 A EP80105744 A EP 80105744A EP 0048302 A1 EP0048302 A1 EP 0048302A1
Authority
EP
European Patent Office
Prior art keywords
spring
snap
handlebar
lever
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.)
Granted
Application number
EP80105744A
Other languages
German (de)
English (en)
Other versions
EP0048302B1 (fr
Inventor
Helmut Dr. Dipl.-Phys. Baader
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.)
Elektromanufaktur Zangenstein Hanauer GmbH and Co KGaA
Original Assignee
Elektromanufaktur Zangenstein Hanauer GmbH and Co KGaA
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
Priority to DE19792937309 priority Critical patent/DE2937309A1/de
Application filed by Elektromanufaktur Zangenstein Hanauer GmbH and Co KGaA filed Critical Elektromanufaktur Zangenstein Hanauer GmbH and Co KGaA
Priority to EP80105744A priority patent/EP0048302B1/fr
Priority to AT80105744T priority patent/ATE10885T1/de
Priority to US06/214,949 priority patent/US4365123A/en
Publication of EP0048302A1 publication Critical patent/EP0048302A1/fr
Application granted granted Critical
Publication of EP0048302B1 publication Critical patent/EP0048302B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/04—Energy stored by deformation of elastic members
    • H01H5/18—Energy stored by deformation of elastic members by flexing of blade springs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches

Definitions

  • S chnappschalter are frequently used in electrical engineering to ensure that switching of electrical contacts happen abruptly when an arbitrarily slowly changing itself input a certain critical Has reached value. Sudden switchovers are necessary in order to achieve reliable contact making and to avoid contact fires. Frequently, for example in the case of diaphragm pressure switches, the input variable is a force which has to be overcome by an adjustable preload in order to cause the snap switch to be switched over.
  • the bias spring is a helical compression spring which is supported on the one hand on an adjusting screw and on the other hand presses directly against the handlebar.
  • the handlebar is mounted on a physically trained axis, which is arranged in a stationary manner such that the handlebar transmits forces required for switching only to the snap spring, but relieves it of transverse forces. This applies both to shear force components of the actuating force acting on the handlebar and to shear force components that can be transmitted from the biasing spring to the handlebar.
  • a non-rotating intermediate layer is arranged, which is to prevent the adjusting screw, when it is turned to adjust the snap switch, from rotating the helical compression spring and building up a torsional tension in it, which is initially retained by static friction, but sooner or later later released due to vibrations of the snap switch, which would change the bias acting on the handlebar, and thus the entire switching characteristics of the snap switch, by an amount not fixed in advance.
  • the magnitude of the bearing friction, which opposes a pivoting of the handlebar, in the known snap-action switch described is dependent on manufacturing tolerances, random displacements of the handlebar along its axis and on bearing corrosion that may occur over time and therefore cannot be adjusted during the snap-action switch Consider appropriately in advance over a longer period of time.
  • the invention is therefore based on the object of designing a snap switch of the type described at the outset with production-technically simple means in such a way that the size of the critical input force required for switching, which was set in the original adjustment, is retained over a practically unlimited time with high accuracy.
  • the bias spring is a leaf spring which is attached on the one hand to the handlebar and on the other hand to a lever which is mounted near the spring support in a fixed bearing and is pivotally adjustable by means of the adjusting member.
  • the or each biasing spring also serves as a bearing for the handlebar, whereby it is kept free from external bearing friction.
  • the inner friction inside a leaf spring of the type and size of interest here is negligible.
  • the or each biasing spring is attached to the handlebar on the one hand and on the lever according to the invention on the other hand, in order to be able to transmit bending moments from the lever to the handlebar, a shift between the biasing spring and the components between which it is clamped is excluded during operation , so that nothing can be lost subsequently from the originally set preload. Losses of spring tension due to fatigue can be ruled out at least as well by suitable dimensioning of the biasing spring in the snap switch according to the invention as in known snap switches of the generic type.
  • a snap-action switch is created by the invention, which maintains its original setting considerably more precisely and also considerably more reliably when manufactured in large series than known snap-action switches of the generic type.
  • the snap switch according to the invention is also largely insensitive to corrosion, because its working accuracy is unaffected by bearing friction. The friction in the bearing of the lever is irrelevant to the working accuracy of the snap switch, since it only occurs during adjustment and the lever is no longer moved later.
  • a rotatable cam or a wedge slide could be used as the setting element.
  • an adjusting element in the form of a screw as is provided as a component, albeit in a different arrangement, also in the known snap switch described.
  • the snap switch has at least one biasing spring
  • the handlebar and adjusting lever are connected to one another by a Pair of leaf springs connected, which are arranged on both sides of the snap spring. This results in a particularly precise and particularly resistant to lateral forces bearing of the handlebar.
  • This embodiment is preferably further developed in that the leaf springs are welded to flanges which project laterally from the cross-sectionally U-shaped link and the correspondingly designed lever, and in that the snap spring is arranged within these U-shaped cross sections.
  • the snap switch according to the invention can be produced according to a further feature of the invention in that the handlebar is punched together with the lever over a bridge, then the leaf spring or leaf springs are welded to the handlebar and lever and only then is the bridge removed.
  • the distance between the handlebar and lever defined in the punching tool is maintained unchanged, and this distance also determines the bending characteristic of the leaf spring or leaf spring, a particularly precise arrangement of the welded connections between each leaf spring and the handlebar on the one hand and the lever on the other hand not being important.
  • a housing 2 which consists of electrically insulating plastic and has a bottom 4 and an outer wall 6.
  • a snap switch 10 is installed in the housing 2.
  • a catch spring in the form of a rectangular leaf spring having two parallel longitudinal slots 14, defining a pair of outer leg 16 so that they are connected only at its two ends together and to a central part of the S chnappfeder 12 .
  • the middle part consists of two middle legs 18, which are separated by an interruption 20.
  • the two longitudinal slots 14 are connected to one another by the interruption approximately in their center, so that there is an overall H-shaped recess.
  • the two separated from one another by the interruption 20 central leg 18 of the latch spring 12 are clamped between a top plate 22 and a spring support 24, both made of metal and welded to them in such a way, since the total length ß of the two middle leg 18 and the interrupt 20 bridging section of the cover plate 22 and the spring support 24 is greater than the length of each of the two outer legs 16.
  • the two middle legs 18 cannot lie in a common plane with the outer legs 16, but either form one with respect to the outer Leg 16 first upward, then downward and finally upward curved serpentine line (Fig. 2 and 4) or a curved upward with respect to the two outer legs 16 (Fig. 3 and 5).
  • the snap spring 12 attached to the spring support 24 is thus bistable; it can only jump back and forth under the action of an external force between a first switching position (FIGS. 2 and 4) and a second switching position (FIGS. 3 and 5).
  • the spring support 24 is fastened to the housing base 4 and has a solder lug 26 which projects through it to the outside.
  • Further electrically conductive components of the snap switch 10 are two stationary contacts 28 and 30, which are attached to a contact carrier 34 and 36 respectively on both sides of a double-sided switching contact 32 attached to the snap spring 12.
  • the contact carriers 34 and 36 are fastened to the housing base 4 and also each have a solder lug 38 and 40, respectively, which protrude through the latter.
  • the snap switch 10 connects the solder lugs 26 and 38 to one another when the snap spring 12 assumes its first switching position according to FIGS. 2 and 4, whereas the solder lugs 26 and 40 are connected to one another when the snap spring 12 has its second, in the drawings assume the lower switching position according to Figures 3 and 5.
  • the snap spring 12 shown here corresponds to that according to patent application P 28 19 795.7; it also shows further examples of snap springs which, in addition to other known snap springs, are suitable for the present snap switch 10.
  • a bearing block 42 is arranged on each side of the spring support 24, which is formed in one piece with the housing 2 and has an articulated socket 44.
  • the joint socket 44 receives two joint heads 46, each on a hook-like part 48 a lever 50 are formed.
  • the lever 50 can be pivoted about a fixed axis A, which extends through the center points of the two joint sockets 44.
  • the lever 50 engages with its two hook-like parts 48 the spring support 24 with ample play, so that it can be pivoted about the axis A in a wide angular range.
  • an adjusting member 52 in the form of a cap screw is provided, which engages at the end of the lever 50 remote from the axis A and is screwed into the housing base 4.
  • the lever 50 In the area between its hook-like parts 48 and the adjusting member 52, the lever 50 has an approximately U-shaped cross section with two flanges 54 which project laterally in a plane parallel to the axis A. With the two flanges 54 two bias springs are welded, which are designed as leaf springs 56 and extend in the same longitudinal direction as the snap spring 12 on both sides. While the snap spring 12 extends between the two bearing blocks 42, the two leaf springs 56 are arranged outside the bearing blocks.
  • the two leaf springs 56 are welded to a flange 58 of a link 60, which is also parallel to the axis A, and together form a bearing for the link 60, which enables this pivoting about the axis A, but no other movement.
  • the axis A is also the transverse center line of the snap spring 12.
  • a hook 62 is formed on the handlebar 60, on which the one end of the snap spring 12, which is remote from the switching contact 32 and from the lever 50, is fastened.
  • the end 64 of the handlebar 60 itself, which is remote from the lever 50, projects into a recess 66 in the housing 2, the upper and lower limits of which each form a stop for the handlebar 60.
  • a conical engagement point 68 for an arm 70 of an actuating member is finally formed on the handlebar 60.
  • the end 64 of the link 60 rests in the rest position of the snap switch 10 with a more or less large bias against the upper limit of the recess 66 (FIGS. 2 and 4).
  • the arm 70 exerts a downward force P on the point of application 68 in the drawings which exceeds a certain amount corresponding to the pretension, then this force P pushes the handlebar 60 into its lower stop position (FIGS. 3 and 5), and on the way there, the snap spring 12 jumps around suddenly, so that its switching contact 32, which was originally placed on the upper fixed contact 28, suddenly detaches from it and contacts the lower fixed contact 30.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Manufacture Of Switches (AREA)
  • Push-Button Switches (AREA)
EP80105744A 1979-09-14 1980-09-24 Interrupteur à action brusque et procédé pour sa fabrication Expired EP0048302B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19792937309 DE2937309A1 (de) 1979-09-14 1979-09-14 Schnappschalter sowie verfahren zu dessen herstellung
EP80105744A EP0048302B1 (fr) 1979-09-14 1980-09-24 Interrupteur à action brusque et procédé pour sa fabrication
AT80105744T ATE10885T1 (de) 1979-09-14 1980-09-24 Schnappschalter sowie verfahren zu dessen herstellung.
US06/214,949 US4365123A (en) 1979-09-14 1980-12-10 Snap switch as well as a method for its manufacture

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19792937309 DE2937309A1 (de) 1979-09-14 1979-09-14 Schnappschalter sowie verfahren zu dessen herstellung
EP80105744A EP0048302B1 (fr) 1979-09-14 1980-09-24 Interrupteur à action brusque et procédé pour sa fabrication
US06/214,949 US4365123A (en) 1979-09-14 1980-12-10 Snap switch as well as a method for its manufacture

Publications (2)

Publication Number Publication Date
EP0048302A1 true EP0048302A1 (fr) 1982-03-31
EP0048302B1 EP0048302B1 (fr) 1984-12-19

Family

ID=27188205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105744A Expired EP0048302B1 (fr) 1979-09-14 1980-09-24 Interrupteur à action brusque et procédé pour sa fabrication

Country Status (4)

Country Link
US (1) US4365123A (fr)
EP (1) EP0048302B1 (fr)
AT (1) ATE10885T1 (fr)
DE (1) DE2937309A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3623200A1 (de) * 1986-07-10 1988-01-14 Schaltbau Gmbh Schnappschalter
US5079806A (en) * 1990-08-01 1992-01-14 Lasso L. P. Pivotal colsure

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1569257B1 (fr) 2004-02-24 2006-07-12 Electrovac, Fabrikation elektrotechnischer Spezialartikel Gesellschaft m.b.H. Capteur de température
ATE352093T1 (de) * 2004-08-23 2007-02-15 Siemens Ag Kontaktsystem

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819795A1 (de) * 1978-05-05 1979-11-08 Zangenstein Elektro Schnappschalter

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2374986A (en) * 1943-02-23 1945-05-01 First Ind Corp Electric switch construction
BE505847A (fr) * 1950-09-16
DE1075705B (de) * 1953-06-22 1960-02-18 Haydon Switch, Incorporated, Waterbury Conn (V. St A) Schnappschalter
DE1939186U (de) * 1966-02-15 1966-05-26 Patinvest Patent Und Invest A Schnappschalter, insbesondere fuer waschmaschinen od. dgl.
US3662132A (en) * 1970-01-26 1972-05-09 Robertshaw Controls Co Electrical switch construction
US4050046A (en) * 1976-05-19 1977-09-20 Cutler-Hammer, Inc. Thermostatic switch
US4168412A (en) * 1978-04-19 1979-09-18 Robertshaw Controls Company Electrical switch construction and method of making the same
DE2938960A1 (de) * 1979-09-26 1981-04-09 Elektromanufaktur Zangenstein Hanauer Gmbh & Co, 8471 Zangenstein Mehrfach-druckschalter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819795A1 (de) * 1978-05-05 1979-11-08 Zangenstein Elektro Schnappschalter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3623200A1 (de) * 1986-07-10 1988-01-14 Schaltbau Gmbh Schnappschalter
US5079806A (en) * 1990-08-01 1992-01-14 Lasso L. P. Pivotal colsure

Also Published As

Publication number Publication date
DE2937309A1 (de) 1981-04-02
EP0048302B1 (fr) 1984-12-19
ATE10885T1 (de) 1985-01-15
US4365123A (en) 1982-12-21

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