US3175052A - Multiple-position rotary stepping switch having an obliquely oriented contact bridge - Google Patents

Multiple-position rotary stepping switch having an obliquely oriented contact bridge Download PDF

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Publication number
US3175052A
US3175052A US125517A US12551761A US3175052A US 3175052 A US3175052 A US 3175052A US 125517 A US125517 A US 125517A US 12551761 A US12551761 A US 12551761A US 3175052 A US3175052 A US 3175052A
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United States
Prior art keywords
contact
switch
bridge
stepping
inner contact
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Expired - Lifetime
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US125517A
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English (en)
Inventor
Willi E Ludwig
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.)
Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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    • 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
    • H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch
    • H01H19/58—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch
    • H01H19/585—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch provided with printed circuit contacts
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor

Definitions

  • the present invention relates to a switch, and, more particularly, to a rotary stepping switch equipped with one or more switching plates provided with printed circuits.
  • Each plate will then have its 360 distributed in such a manner that the stepping contacts for changing the ranges are accommodated between the O and 180 positions, while a continuous, arcuate contact is arranged between the 180 and 360 positions.
  • instruments having three or four terminals it is customary not to interrupt the current circuit within the instruments when voltage measurements are being carried out.
  • the switch thus has to provide a short circuit throughout approximately 180 or must close the electrical path of the individual contacts.
  • FIGURE 1 shows a typical contact arrangement according to the prior art, which comprises a switch plate S provided with printed circuitry.
  • the stepping contacts 1 occupy approximately 180, the remaining 180 being occupied by an arcuate outer contact 2.
  • the stepping contacts are formed with extensions 3 which end in terminals 4, as is shown for two of the stepping contacts.
  • the rotary axis of the switch is shown at 5.
  • the printed circuitry also includes a circular inner contact 6 which is arranged about the axis 5 and is partly surrounded by the stepping contacts 1.
  • the inner contact 6 is connectible to the individual stepping contacts 1 by way of an obliquely oriented contact bridge 7 which is part of the switch and which is rotatable about the axis 5.
  • the contact bridge 7 is fixedly and insulatedly mounted on the shaft 5 which turns about the axis 5.
  • the inner contact 6 is a ring located between the shaft 5' and the contracts 1, 2, and this means that the distance between contact 6 from the contacts 1, 2, as well as from the shaft 5 will be very small; in practice, the distances will be even smaller than shown in the drawings which are drawn on an enlarged scale to facilitate illustration of the subject matter involved. Consequently, very little 3,175,052 Patented Mar. 23, 1965 space is available to accommodate the terminal for the inner contact ring 6; in the structure shown in FIGURE 1, the terminal 8 is arranged in the space between the contact 6 and the shaft 5'.
  • the primary object of the present invention to provide a stepping switch which overcomes the above disadvantages, namely, a switch in which the terminal of the inner contact need no longer be accommodated in a very small and difiicultly accessible place.
  • the present invention resides mainly in a stepping switch having an oblique contact bridge cooperating with a switching plate provided with printed circuitry which includes circular inner contact means arranged about the rotary axis of the switch, a plurality of stepping contacts arranged about the inner contact means, and outer contact means which are connectible to the inner contact by the contact bridge in a plurality of positions of the switch, which switch incorporates the following improvement: (a) the inner contact means are fashioned as an open ring and have an end that extends outwardly in approximately radial direction, this end serving as a terminal of the inner contact means and as a portion of the outer contact means, and (b) the outer contact means have a part extending into the ring opening and serving as a portion of the inner
  • oblique as used throughout the instant specification and claims with respect to the orienta tion of the contact bridge, is intended to refer to such a position of the bridge that a line joining the two contacts of the bridge is inclined with respect to a radial line passing through the rotary axis of the switch.
  • FIGURE 1 shows a switch plate structure according to the prior art.
  • FIGURE 2 shows an oblique contact bridge adapted for use with a switch plate accord ing to the prior art as well as with a switch plate according to the present invention.
  • FIGURE 3 shows one embodiment of a switch plate structure according to the present invention.
  • FIGURE 4 shows another embodiment of a switch plate structure according to the present invention.
  • FIGURE 5 shows yet another embodiment of a switch plate structure according to the present invention.
  • FIGURE 3 shows a switch plate S incorporating a plurality of stepping contacts 1a arranged about the rotary axis 5a and distributed throughout approximately The remaining 180 are occupied by an outer contact 2a which is connectible to the inner contact 6a by means of the oblique contact bridge 7 shown in FIGURE 2.
  • the contact 6a is fashioned as an open ring and has an end 9 that extends outwardly in approximately radial direction. A part 10 of this end 9 serves as a portion of the outer contact, and part 11 serves as a terminal for the inner contact 6a.
  • the outer contact 2a has a part 12 which extends into the ring opening and serves as a portion of the inner contact.
  • the contact bridge is shown schematically in five positions v, w, x, y, and z, in each of which the inner and outer contacts 6a and 2a are electrically connected to each other by the bridge.
  • the same switching 3 effect is obtained as with the known stucture depicted in FIGURE 1, with the difference that the terminal by means of which an external lead is connectible to the inner contact 6a is no longer squeezed into a difficult and inconvenient location.
  • the switch plate S is provided with stepping contacts 1b arranged about the axis 5b, the inner contact 6b having its end $1) extending outwardly.
  • the part 1% serves as a portion of the outer contact and the part 11b as the terminal.
  • the outer contact 2b has its part 12b extending into the ring opening and serving as a portion of the inner contact.
  • FIGURE 4 shows four switching positions w, x, y, and z, in which the inner and outer contacts 6b and 2b are connected.
  • FIGURE 4 thus differs from that of FIGURE 3 in that in the latter the end 9 of the inner contact means and the part 12 of the outer contact means are coextensive throughout a portion of their circumferential lengths, whereas in the embodiment of FIGURE 4 the circumferential length of the part 12b of the outer contact means does not exceed the circumferential length of the ring opening.
  • FIGURE 5 is similar to that of FIGURE 4, and the components of the switch S are shown by analogous reference characters. The difference is that the ring opening, the end part 100, and the part 12c have a circumferential length of but one switching step, as compared to the two-step length in FIGURE 4. Two switching positions y and z are shown.
  • the instant invention is not limited to single pole arrangements, in that the contact 6 can be split, thereby forming a multiple-pole switching system. Furthermore, the invention may readily be incorporated in switches having either a single or a plurality of switch plates.
  • a multiple-position rotary stepping switch comprising, in combination: a contact bridge; means inovably mounting said contact bridge for rotation about a rotaiy axis, said bridge being oriented obliquely with respect to said rotary axis; and a switching plate cooperating with said contact bridge and provided withprinted circuitry which includes a plurality of stepping contacts arranged about said rotary axis of the switch, an inner contact also arranged about said rotary axis and partly surrounded by said stepping contacts, and an outer contact connectible to said inner contact by said contact bridge in a plurality of positions of the switch, said inner contact being configured as an open ring and having an end that extends outwardly in approximately radial direc tion, said end serving as a terminal of said inner contact and as a portion of said outer contact, and said outer contact having a part extending to the ring opening and serving as a portion of said inner contact.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US125517A 1960-07-25 1961-07-20 Multiple-position rotary stepping switch having an obliquely oriented contact bridge Expired - Lifetime US3175052A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL36664A DE1133788B (de) 1960-07-25 1960-07-25 Stufendrehschalter mit einer oder mehreren in gedruckter Schaltung ausgefuehrten Schalterebenen

Publications (1)

Publication Number Publication Date
US3175052A true US3175052A (en) 1965-03-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US125517A Expired - Lifetime US3175052A (en) 1960-07-25 1961-07-20 Multiple-position rotary stepping switch having an obliquely oriented contact bridge

Country Status (3)

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US (1) US3175052A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1133788B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL266516A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437766A (en) * 1966-11-15 1969-04-08 Milwaukee Chaplet & Mfg Co Inc Tap switch assembly with improved detent and contact structure
US3499279A (en) * 1967-02-20 1970-03-10 Akira Abe Digital timer
US3715547A (en) * 1970-05-16 1973-02-06 Lucas Industries Ltd An electrical switch having an obliquely orientated roller contact

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896033A (en) * 1955-01-27 1959-07-21 Daystrom Inc Printed circuit assembly
US3042763A (en) * 1959-11-09 1962-07-03 Controls Co Of America Timer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896033A (en) * 1955-01-27 1959-07-21 Daystrom Inc Printed circuit assembly
US3042763A (en) * 1959-11-09 1962-07-03 Controls Co Of America Timer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437766A (en) * 1966-11-15 1969-04-08 Milwaukee Chaplet & Mfg Co Inc Tap switch assembly with improved detent and contact structure
US3499279A (en) * 1967-02-20 1970-03-10 Akira Abe Digital timer
US3715547A (en) * 1970-05-16 1973-02-06 Lucas Industries Ltd An electrical switch having an obliquely orientated roller contact

Also Published As

Publication number Publication date
NL266516A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE1133788B (de) 1962-07-26

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