US2912527A - Cam-controlled electrical switch consisting of axially aligned units - Google Patents

Cam-controlled electrical switch consisting of axially aligned units Download PDF

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Publication number
US2912527A
US2912527A US653793A US65379357A US2912527A US 2912527 A US2912527 A US 2912527A US 653793 A US653793 A US 653793A US 65379357 A US65379357 A US 65379357A US 2912527 A US2912527 A US 2912527A
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cam
switch
cams
shaft
axially aligned
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Expired - Lifetime
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US653793A
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English (en)
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Naimer Hubert
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    • 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
    • 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
    • H01H19/64—Encased switches adapted for ganged operation when assembled in a line with identical switches, e.g. stacked switches

Definitions

  • the switch shafts must be cut to length in dependence on the overall length of the switch, i.e., on the number of units forming the switch. In addition to the manufacturingwork required for this operation, this involves the need for a large stock of shafts of standardized lengths. A reshaping of such stocks, as is often necessary in the case of difficulties in the supply of bar material, causes losses of time and particularly of material.
  • a metal shaft must be sufliciently spaced from the live parts of the switch to ensure that the inevitable creep paths are sufliciently long. This requirement alone gives rise to dimensions of the switch which are larger than would be required for mechanical reasons.
  • a metal shaft is provided it must either be effectively insulated from the actuating member or must be perfectly grounded, which involves certain structural difiiculties.
  • a cam-controlled electrical switch which consists of axially aligned units and in which cams which actuate the circuit breaking members are provided with shaft stubs on both sides, at least one of which shaft stubs of each cam serves for rotatably supporting the cam in'a wall of a switch unit and each of which shaft stubs may also serve for coupling the cam to an axially adjacent 2,912,527 Patented Nov. 10, 1959 ice to be plugged into the bush of an axially adjacent cam to couple both cams for joint rotation.
  • the present invention relates to an important development of this structure.
  • Fig. 1 is a longitudinal sectional view showing a cam-controlled switch which consists of three switch units and a stepping gear, whereas the jumper bridges and switch contacts, terminals, retaining springs and the like, which are of no interest in this connection, are omitted.
  • Figs. 2 and 3 are an end view and a side view, partly in section, of a cam according to the invention.
  • Fig. 4 shows the connection of the cam according to the invention with an operating handle and
  • Fig. 5 is a side view of one of said cams, with the turning grip omitted.
  • Fig. 6 shows that it is, possible to fulfil several switching requirements with one plastic cam according to the invention by providing cams selectively with control elevations or depressions disposed at different points.
  • numeral 1 denotes the casings of the switch un t 2 the ea .Qf th steppi e and 3 the thr e ams, efo e w c a s a e hap d s pp ng Whe 6 is arranged, which is also formed according to the invention.
  • an operating handle is coupled by the jaws 5 in a manner which will be described hereinafter to the stepping wheel 6 belonging to the stepping gear. That stepping wheel is essentially a multiple cam. For this reason what Will be said hereinafter of the switch cams applies analogously also to that stepping wheel.
  • the casings 1 form chambers which accommodate in known manner the jumper bridges and the associated c uati g m an co i g es; 9f a rol whi h engages the cam and a plunger which operates the jumper bridge.
  • the last casing 1 is closed by acover 7. All asi 1, .2 a he c ve 7 ar he d together by axial y exten in cre or o e tain g means (n S w
  • Eachcam, Figs. 2, 3, consistsof'the actual .cam disc 8, which is provided on both sides with shaft stubs 9, 10, which are preferably integral with the cam.
  • each cam 3 is rotatably supported in a casing 1 or 2 only on one side, as is shown in Fig. 1.
  • the shaft stub 10 has ,a coupling extension 14, which takes here the form of a pin and has a suitable profile, e.g.
  • the shaft stub 9 has a recessformed with aco nform ing profileof suflicient depth for fittingly receiving the pinshaped shaft stub 14 of the adjacent cam.
  • the cams are simply fitted one in the other, as is shown in Fig. 1 and are thus coupled for joint rotation. On the other hand, they are held without axial play in thecasing because they have no freedom of lateral movement therein.
  • the tough ness of the plastic ensures an adequate resistance to fracture and permits also of a compensation of inevitable small manufacturing and assembling tolerances, which mayresult, e.g., in a slight misalignment of the journals.
  • the cam 6 forming the stepping wheel may have shaft stubs somewhat different from those of the switch cams.
  • One of its shaft stubs 1-5 has an outwardly protruding extension 15a of non-cylindrical shape, in the present embodiment of hexagonal section. That extension is continued by a squarepin 16.
  • a ,sufiiciently firm coupling between the grip 4 and the cam 6 and thus with all other cams 3 is ensured by the extension 4a of the grip .4 makingconnection with the hexagonal portion 15.
  • the stepping gear is disposed between .the first switch unit and the actuating member 4. It can be realized, however, that this arrangement is n esse ial beca selhm .Q the fi s switch uni 4: can easily be provided with an extension 15, 15a and a pin 16 though this would eliminate the desirable uniformity of the switch cams.
  • Fig. 6 shows a cam which consists of a serrated core 26 and a profiled cam ring 27, the contour of which is selected according to the s witehing requirements of each case.
  • the cores 26 may be kept on stock.
  • T1 6 i llll l g portions should be given a tubular section with multiple teeth.
  • An. example is also shown in Fig. 6, wherein part 26 is the coupling pin of the adjacent cam. This ensures an optimum transmission of forces with the least expenditure of material.
  • tooth coupling profile enables each cam to be mounted relative to those of the adjacent switch chambers at an angle which is a multiple of the pitch angle of the teeth. This enables a considerable reduction in the number of cam profiles required for controlling the electrical contacts.
  • the tubular section has also the advantage that a duct is formed which extends centrally throughout the switch and maybe-used for a number of .special functions desired in switch construction (e.g., double shaft, pushbutton actuation through the switch, etc.).
  • the semielastic properties of the superpolyamides enable the virtual elimination of the radial play which is otherwise required. This ensures that even in switches having a large number of units the transmission of torsion corresponds to that of a steel shaft. Because the cam as such is injection-moulded, the timeof manufacture 'is in no way prolonged by the simultaneous injectionmoulding of the coupling profile on both sides. This applies also to the stepping wheel. Thus notime is required for the manufacture of the shaft. A finished switch can easily be extended or reduced by some switch chambers without requiring a replacement of the shaft, as was necessary before. Difierent switch types (for different current values) can easily be coupled by an adapter whereas previously special, now standardized, switch shafts were required for this purpose.
  • a rotary earn-controlled electrical switch comprising, in eombina tion a plurality of axially aligned housing units, each housing unit having two axially spaced end walls with ,axially aligned apertures in the end walls, acam rotatablymounted in each housing unit for actuatingat least oneci-rcuit breakingelement with an actuating force perpendicular to the axis of rotation of the cam, andeach cam comprising two axially extending tubular hubs, one of said hubs carrying a coupling having a serrated periphery while theother hub has acorrespondingly serrated axial bushingengageable by said coupling of an adjacent one.
  • said cams consisting of a high-melting,electrically insulating therrno-plastic resin selected from the group consisting of polyarnicles, superpolyamides and resins substantially equivalent theretoin mechanical strength, tenacity, moderate'elasticity and abrasion-resistance, and axially aligned bearings being provided in said housing unit end walls to receive at least one of said hubs of eachcam and to support the cams rotatably in said housing units.
  • each cam forms an integral element withits cam hubs and their coupling and bushing, respectively, each element having a central bore therethrough.
  • the rotary cam-controlled electrical switch of claim The multiple In the case of breakdown 1, comprising a switch actuating clement adjacent an end 2,757,250 Brown July 31, 1956 one of said cams, the coupling of said end cam facing the 2,796,474 Glogau June 18, 1957 actuating element and the actuating element gripping the FOREIGN PATENTS periphery of the cam hub carrying said coupling.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Mechanisms For Operating Contacts (AREA)
US653793A 1956-04-23 1957-04-19 Cam-controlled electrical switch consisting of axially aligned units Expired - Lifetime US2912527A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT350025X 1956-04-23

Publications (1)

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US2912527A true US2912527A (en) 1959-11-10

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US653793A Expired - Lifetime US2912527A (en) 1956-04-23 1957-04-19 Cam-controlled electrical switch consisting of axially aligned units

Country Status (7)

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US (1) US2912527A (xx)
BE (1) BE556861A (xx)
CH (1) CH350025A (xx)
DE (1) DE1087224B (xx)
FR (1) FR1174209A (xx)
GB (1) GB856813A (xx)
NL (1) NL216115A (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976377A (en) * 1957-07-23 1961-03-21 Kingston Products Corp Switch construction and mechanism therefor
US3025446A (en) * 1957-08-09 1962-03-13 Installations Allan Leffler Fa Controlling motor for mechanical setting of regulating members in regulating systems
US3114012A (en) * 1960-08-16 1963-12-10 Northrop Corp Landing gear switch
US3156123A (en) * 1961-01-18 1964-11-10 Gen Electric Sequence controller mechanism
US3218425A (en) * 1963-07-05 1965-11-16 Oak Electro Netics Corp Modular switch construction
US3260803A (en) * 1963-07-10 1966-07-12 Moroishi Mitsuru Segmental rotary gang switch with segmented splined cam shafts
US3429199A (en) * 1966-02-04 1969-02-25 Robertshaw Controls Co Switch construction and method
FR2386118A1 (fr) * 1977-03-28 1978-10-27 Sodeco Compteurs De Geneve Installation a commutateurs
US4724287A (en) * 1984-10-26 1988-02-09 Cgee Alsthom Versatile multideck rotary switch
US4861949A (en) * 1987-06-26 1989-08-29 Breter S.P.A. Cam switch formed by modular units
EP1318534A1 (de) * 2001-12-10 2003-06-11 E.G.O. Elektro-Gerätebau GmbH Aufnahme mit einer Achse zur Drehbedienung eines Schaltgeräts o. dgl.

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1219560B (de) * 1962-07-24 1966-06-23 Rau Swf Autozubehoer Schalter
CH544996A (de) * 1971-08-04 1973-11-30 Sprecher & Schuh Ag Durch eine Drehbewegung betätigbarer Nockenschalter
DE102005019099A1 (de) * 2005-04-25 2006-10-26 Tend Technology Co., Ltd. Stufenschaltvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2262306A (en) * 1940-09-03 1941-11-11 Pacific Electric Mfg Corp Auxiliary circuit controlling switch
US2588632A (en) * 1947-04-19 1952-03-11 Max L Jeffrey Switch
US2757250A (en) * 1953-09-11 1956-07-31 Gen Motors Corp Direction signal mechanisms
US2796474A (en) * 1955-06-06 1957-06-18 Allen Bradley Co Preselection switch

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE751687C (de) * 1941-08-28 1953-03-23 Aeg Walzenschalter mit Nockenscheiben
DE851086C (de) * 1950-09-12 1952-10-02 Starkstrom Schaltgeraetefabrik Nockenscheibe fuer Nockenschalter
CH306764A (de) * 1953-11-18 1955-04-30 Bays Fernand Elektrischer Schalter und Verfahren zu seiner Herstellung.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2262306A (en) * 1940-09-03 1941-11-11 Pacific Electric Mfg Corp Auxiliary circuit controlling switch
US2588632A (en) * 1947-04-19 1952-03-11 Max L Jeffrey Switch
US2757250A (en) * 1953-09-11 1956-07-31 Gen Motors Corp Direction signal mechanisms
US2796474A (en) * 1955-06-06 1957-06-18 Allen Bradley Co Preselection switch

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2976377A (en) * 1957-07-23 1961-03-21 Kingston Products Corp Switch construction and mechanism therefor
US3025446A (en) * 1957-08-09 1962-03-13 Installations Allan Leffler Fa Controlling motor for mechanical setting of regulating members in regulating systems
US3114012A (en) * 1960-08-16 1963-12-10 Northrop Corp Landing gear switch
US3156123A (en) * 1961-01-18 1964-11-10 Gen Electric Sequence controller mechanism
US3218425A (en) * 1963-07-05 1965-11-16 Oak Electro Netics Corp Modular switch construction
US3260803A (en) * 1963-07-10 1966-07-12 Moroishi Mitsuru Segmental rotary gang switch with segmented splined cam shafts
US3429199A (en) * 1966-02-04 1969-02-25 Robertshaw Controls Co Switch construction and method
FR2386118A1 (fr) * 1977-03-28 1978-10-27 Sodeco Compteurs De Geneve Installation a commutateurs
US4724287A (en) * 1984-10-26 1988-02-09 Cgee Alsthom Versatile multideck rotary switch
US4861949A (en) * 1987-06-26 1989-08-29 Breter S.P.A. Cam switch formed by modular units
EP1318534A1 (de) * 2001-12-10 2003-06-11 E.G.O. Elektro-Gerätebau GmbH Aufnahme mit einer Achse zur Drehbedienung eines Schaltgeräts o. dgl.

Also Published As

Publication number Publication date
GB856813A (en) 1960-12-21
CH350025A (de) 1960-11-15
BE556861A (xx)
FR1174209A (fr) 1959-03-09
DE1087224B (de) 1960-08-18
NL216115A (xx)

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