US2684412A - Cam-controlled switch - Google Patents

Cam-controlled switch Download PDF

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Publication number
US2684412A
US2684412A US271988A US27198851A US2684412A US 2684412 A US2684412 A US 2684412A US 271988 A US271988 A US 271988A US 27198851 A US27198851 A US 27198851A US 2684412 A US2684412 A US 2684412A
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US
United States
Prior art keywords
switch
spindle
cam
contact bridge
switching
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
US271988A
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English (en)
Inventor
Bauer Franz
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Individual
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Individual
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Publication date
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Publication of US2684412A publication Critical patent/US2684412A/en
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
    • 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
    • H01H19/54—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
    • H01H19/626—Contacts actuated by radial cams actuating bridging contacts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the present invention relates to an electric switch, which has a cam-operated contact bridge the spacing of which relative to the switch axis is changed upon performance of the switching movement, switch having arranged between the control cam and the contact bridge a roller following the control cam. It is an object of the invention to improve said switch so that its space requirement is reduced in relation to the power to be controlled and a reliable double break is ensured even after prolonged use, in spite of simplicity in structure and manufacture, desired combination being possible by aligning several of such switches to perform any switching program.
  • cam switches that may be combined are known. Usually the individual switch contacts are operated by the switching cams through the intermediary of rollers and levers, which are thereby swung about their pivots. These switches, however, interrupt the circuit only at one point.
  • This object is to be achieved with small space requirements and simple structural elements.
  • an electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with said contact bridge unit only in said direction of switching so that of a force exercised on the contact bridge unit only a component eirective in said direction of switching is transmitted, if insignificant sliding resistance forces are neglected.
  • the forces which are directed transversely to the direction of switching and for the perfect absorption of which long plunger guides were required previously, are derived exclusively to the switch body by a special bearing arrangement of the roller.
  • This arrangement also permiis of a simpler mounting of the stationary contacts whereby, as a whole, the structure of the present switch is greatly simplified without affecting its eiiectiveness or service life.
  • Fig. l is a top plan View on the switch body, showing the switch mechanism, the casing cover being removed, and
  • Fig. 2 a cross-sectional view of a switch combination consisting of two such switches and a stepping unit.
  • Fig. 1 some of the movable parts and a stationary contact carrying connecting part have been omitted whereas Fig. 2 shows the switch part min a section taken along line IlIa:lIa, and the switch part b in a section along line IIbIIb of Fig. 1.
  • Part 0 of Fig. 2 is the stepping unit common to both switches and not iorrning part of the invention.
  • Fig. 3 serves to explain the kinematic phenomena in the guide device for the switch roller
  • Figs. 4: to 6 show the construction of a stationary contact part
  • Figs. 7 and 8 show the construction of the contact bridge.
  • the insulating switch body I is suitably formed from synthetic resin. It has four apertures, through which the clamping studs :2 are stuck, which as shown in Fig. 2 hold together the entire combination switch consisting in the present eX- ample of the switch units a, o and the stepping unit 0.
  • the square switch shaft 3 carries the switching cams 5, each of which cooperates with pressure rollers 5only the upper one is shownof the switch plunger.
  • the switching cam i is indicated with dashed lines.
  • Each switch plunger consists of a pressed syntheticresin part i into which a roller-guiding metal fork 8 is pressed, in which the spindle 9 carrying the roller 5 is mounted. As shown on Fig.
  • this part "i is guided between a smooth part of the inside wall it of the switch body member I, on the one hand, and a similar part of the outside wall i2, which may form part of the adjacent switch body member or, as in the example shown, of a cover member
  • the contact bridge it rests with a large surface area on the outer end face of the part i.
  • the contact bridge has an aperture embracing an extension I? or" the part 1.
  • a compression spring !8 bearing against the rim part is of the switch body member I, acts directly on the contact bridge l5.
  • the spindle s of the roller laterally protrudes beyond the prongs or the fork 8.
  • These protruding parts find safe guidance on the one hand in a slot at recessed into the switch body member I and forming a guiding groove, and on the other hand i a guide piece 2! resting in a recess 22 in the casing cover 3'5 (Fig. 2).
  • a guide piece 2! resting in a recess 22 in the casing cover 3'5 (Fig. 2).
  • the outside of the switch body member is given corresponding recesses 22, into which the guide pieces of any adjacent switch unit are inserted.
  • the embodiment shown illustrates a double switch having two mutually opposite contact bridges l5, that a switch for the simultaneous interruption of two conductors.
  • the invention is not restricted to this type of switch; it is possible to interrupt at the same time three or more circuits, the contact bridges being suitably providcd in a star arrangement. By a corresponding shape of the switching earn it is possible to cause one circuit to be closed when the other is opened, etc.
  • Fig. 2 it is apparent from Fig. 2 that by arranging any desired number of switch bodies in am'al alignment, and operating them by a single shaft 5, any desired switching program may be performed.
  • the necessary stepping mechanism is provided in the form or" a separate stepping device 0 (Fig. 2).
  • the spindle 9 has in the fork 3 some lateral play, which relative to the play of said spindle in the guide slot as or slot plate 2
  • roller 5 the opposite sense as the roller 5. It is apparent that sliding friction is exercised to any substantial extent only between the roller 5 and its spindle ii; the thus produced lateral shear effeet is small, however, and be removed almost entirely if antifriction bearings are used
  • the roller 5 being of much larger diameter than the spindle 9, both parts may be made integral, without thereby substantially deteriorating the conditions described because the fact that parts 5 and 9 are integral does not substantially affect the described resolution of forces.
  • the contact bridge is lifted accurately from the fixed contacts provided on contact pieces or connecting pieces 25. This lifting taking place evenly and without sliding movements between the contacts, the latter have a silver layer without any risk that the contact may be worn off soon.
  • the parts 26 are inserted with their ends into recesses 36 of the switch body.
  • the parts 25, as shown in Figs. 4 and 5, which represent the contactcarrying stationary connecting part in a front view (Fig. 4) and an appertaining side elevation (Fig. 5), have extensions 3
  • the extensions of the part 26 (Figs. 4, 5) fit corresponding recesses provided at the outside of the adjacent switch body member I (Fig. 2b) or of a cover part 3'! (Fig. 2a).
  • This connecting part is formed by bending from a flat copper strip shown in Fig. 6.
  • the threaded holes receiving the terminal screws are designated with 34, the rivet hole to receive the contact head 25 is designated with 35.
  • the thus completed connecting parts are stuck without any fixing screws simply between the recesses provided on the switch body or cover part 3'! and are clamped by the clamping screws 2 forcing the said parts together.
  • Figs. 7 and 8 show a contact bridge in elevation and in a section taken along line VII--Vl1 of Fig. 8, respectively, the contact heads being omitted.
  • An offset central portion 36 forms a spring plate for the compression spring [8, the force of which determines the contact pressure.
  • the described bearing and guiding arrangement for the switch plunger permits of numerous variations, of course, e. g., the guide piece 2
  • the forces transmitted by the cam to the roller are resolved into a transverse component, which is taken up only by the switch body or switch casing, and a component moving the contact bridge. Since the forces laterally stressing the contact bridge are now eliminated, short guide means for the same suifice so that the overall height is reduced. Because there are no longer any appreciable shear forces acting on the stationary contacts, either, the latter may simply be stuck into the switch body, whereby the cost of manufacturing the switch is out.
  • the cam control described 6 may also be used as a stepping mechanism in the part c, Fig. 2. In this case the contact bridge is eliminated. As compared with the prior art this arrangement leads to the replacement of the previously used tension springswhich tend to suffer eye breakage-by compression springs, and also saves space.
  • An electric switch comprising at least two switch body members, fixedly arranged contact parts carried by at least one of said switch body members, said switch body members including a switch cover, a rotary cam mounted in each switch body member, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, and being adapted to cooperate with said fixedly arranged contact parts, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members, one end or said spindle being mounted in the space between one set of said projections provided on said switch cover, another end of said spindle being mounted in the space between one set of said projections provided on another one of said switch body members, said projections being adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit only in said direction of switching so that of
  • An electric switch comprising at least two switch body members, fixedly arranged contact parts carried by said switch body members, said switch body members including a switch cover, a rotary cam mounted in each switch body member, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, and being adapted to cooperate with said fixedly arranged contact parts, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter smaller than the roller, and mutually parallel projections provided on said switch body members, one end of said spindle being mounted in the space between one set of said projections provided on said switch cover, another end of said spindle being mounted in the space between one set of said projections provided on another one of said switch body members, said projections being adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit onl in said direction of switching so that of a force
  • An electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, said contact bridge unit having a forklike extension, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle having a diameter smaller than said roller, said roller being freely rotatably mounted on said spindle, and mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle extending through said forklike extension with a lateral play larger than its lateral play in said projections, said spindle engaging with the contact bridge unit only in said direction of switch ing so that of a force exercised on the contact bridge unit only a co: pcnent effective in said direction of switch is transmitted.
  • An electric switch comprising at least one switch body member, a rotary earn, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, a spindle for mounting said roller, said spindle having a diameter small r than the roller, mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle engaging with the contact bridge unit only in said direction of witching so that of a force exercised on the contact bridge unit only a component effective in said direction of switching is transmitted, and connecting members carrying contacts adapted to cooperate with said contact bridge unit, each connecting member having projections fixed to said switch body members only by the interlocking of projections of each connecting member with recesses in said switch body members.
  • an electric switch comprising at least one switch body member: the provision of means for transmitting motion only in a direction of switching from a rotary cam to a contact bridge unit movable in said direction of switching to vary its spacing from the axis of rotation oi the cam, said means comprising a roller interposed between the cam and the contact bridge unit and adapted to roll on the earn, a spindle for mounting said roller, said spindle having a diameter smaller than said roller, a forklike extension of said contact bridge unit, and mutually parallel projections provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transverse to said direction, said spindle extending through said forklike extension with a lateral play larger than its lateral play in said projections, said spindle engaging with the contact bridge unit only in said direction of switching so that of a force exercised on the contact bridge unit only a component eiTective in said direction of switching is transmitted.
  • an electric switch comprising at least one switch body member, a rotary cam, a contact bridge unit movable in a direction of switching to vary its spacing from the axis of rotation of the cam, a roller interposed between the cam and the contact bridge unit and adapted to roll on the cam, and a spindle for mounting said roller, said spindle having a diameter smaller than the roller: the provision of means to transmit to the contact bridge unit, of a force exercised on said spindle, only a component effective in said direction of switching, said means comprising a forklike extension of said contact bridge unit and mutually parallel extensions provided on each switch body member and adapted to guide said spindle in said direction of switching and to prevent its movement transversely to said direction, said iorklike extension embracing said spindle with a lateral play larger than the lateral play with which said projections embrace said spindle to prevent said spindle from engaging with said contact bridge unit other than in said direction of switching.

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  • Steering Controls (AREA)
  • Push-Button Switches (AREA)
  • Mechanisms For Operating Contacts (AREA)
US271988A 1951-01-02 1951-12-19 Cam-controlled switch Expired - Lifetime US2684412A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT301180X 1951-01-02

Publications (1)

Publication Number Publication Date
US2684412A true US2684412A (en) 1954-07-20

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ID=3671136

Family Applications (1)

Application Number Title Priority Date Filing Date
US271988A Expired - Lifetime US2684412A (en) 1951-01-02 1951-12-19 Cam-controlled switch

Country Status (7)

Country Link
US (1) US2684412A (fr)
BE (1) BE508130A (fr)
CH (1) CH301180A (fr)
DE (1) DE1006486B (fr)
FR (1) FR1054290A (fr)
GB (1) GB710788A (fr)
NL (1) NL77290C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1159075B (de) * 1956-04-23 1963-12-12 Hubert Naimer Elektrischer Schaltapparat mit ausgepraegter Achse
US3928740A (en) * 1973-02-23 1975-12-23 Naimer H L Rotary switch
US20060081380A1 (en) * 2003-12-15 2006-04-20 Hoffman Corey E Collar locator for slick pump

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1123012B (de) * 1958-02-25 1962-02-01 Elektroschaltgeraete Grimma Ve Kombinationsfaehiger Nockenschalter
DE1084811B (de) * 1958-10-01 1960-07-07 Continental Elektro Ind Ag Nockenschalter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL49444C (fr) *
US1826509A (en) * 1929-06-14 1931-10-06 Harry A Douglas Electric switch
US2308406A (en) * 1940-03-15 1943-01-12 Square D Co Electric switch
CH228328A (de) * 1942-09-23 1943-08-15 Bbc Brown Boveri & Cie Einrichtung zum periodischen Schliessen und Öffnen von Stromkreisen.
GB633808A (en) * 1947-12-15 1949-12-30 Craig & Derricott Ltd Improvements relating to rotary electric switches
US2511821A (en) * 1950-06-13 Control mechanism
US2588632A (en) * 1947-04-19 1952-03-11 Max L Jeffrey Switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH230341A (de) * 1942-12-12 1943-12-31 Spaelti Fridolin Elektrischer Schalter mit mehreren Schaltkammern.
US2521519A (en) * 1944-12-04 1950-09-05 Cutler Hammer Inc Circuit controller

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL49444C (fr) *
US2511821A (en) * 1950-06-13 Control mechanism
US1826509A (en) * 1929-06-14 1931-10-06 Harry A Douglas Electric switch
US2308406A (en) * 1940-03-15 1943-01-12 Square D Co Electric switch
CH228328A (de) * 1942-09-23 1943-08-15 Bbc Brown Boveri & Cie Einrichtung zum periodischen Schliessen und Öffnen von Stromkreisen.
US2588632A (en) * 1947-04-19 1952-03-11 Max L Jeffrey Switch
GB633808A (en) * 1947-12-15 1949-12-30 Craig & Derricott Ltd Improvements relating to rotary electric switches

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1159075B (de) * 1956-04-23 1963-12-12 Hubert Naimer Elektrischer Schaltapparat mit ausgepraegter Achse
US3928740A (en) * 1973-02-23 1975-12-23 Naimer H L Rotary switch
US20060081380A1 (en) * 2003-12-15 2006-04-20 Hoffman Corey E Collar locator for slick pump

Also Published As

Publication number Publication date
NL77290C (fr)
GB710788A (en) 1954-06-16
FR1054290A (fr) 1954-02-09
DE1006486B (de) 1957-04-18
CH301180A (de) 1954-08-31
BE508130A (fr)

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