US3018340A - Electric switch mechanism - Google Patents

Electric switch mechanism Download PDF

Info

Publication number
US3018340A
US3018340A US824518A US82451859A US3018340A US 3018340 A US3018340 A US 3018340A US 824518 A US824518 A US 824518A US 82451859 A US82451859 A US 82451859A US 3018340 A US3018340 A US 3018340A
Authority
US
United States
Prior art keywords
cam
blade
section
contact
base
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
US824518A
Other languages
English (en)
Inventor
Lewis J Eggert
William S Tufts
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.)
Robertshaw US Holding Corp
Original Assignee
Ranco Inc
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 GB111/32A priority Critical patent/GB388532A/en
Application filed by Ranco Inc filed Critical Ranco Inc
Priority to US824518A priority patent/US3018340A/en
Priority to ES0258279A priority patent/ES258279A1/es
Priority to DK227260AA priority patent/DK104633C/da
Priority to CH674960A priority patent/CH363701A/fr
Priority to DER28170A priority patent/DE1171496B/de
Priority to FR830959A priority patent/FR1260515A/fr
Application granted granted Critical
Publication of US3018340A publication Critical patent/US3018340A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H5/00—One-port networks comprising only passive electrical elements as network components
    • H03H5/02—One-port networks comprising only passive electrical elements as network components without voltage- or current-dependent elements

Definitions

  • the present invention relates to improvements in an electrical switch mechanism of the type comprising a rotatable cam having a surface on which one or more switch members ride and which surface has a step portion which drops at least one switch member relative to the other to cause a making or breaking of an electrical circuit.
  • the principal object of the invention is the provision of an improved electrical switching mechanism of the type mentioned in which one of the switch members comprises a resilient blade which can be adjustably positioned relative to the cam so that the angular position of the cam at which the blade drops from the step on the cam surface can be accurately established and which adjustment can be elfected by merely deflecting the blade by simple means, such as a screw.
  • the invention comprises the combination of a housing or base on which a rotatable cam is supported, the cam having a surface including a rise and a step or drop-off intermediate high and low points of the rise surface, and which cam surface is engaged by a pair of co-engageable switch members, one of which comprises a resilient blade formed with two sections disposed at less than a straight angle with one another, one section being anchored to the base and the opposite end of the other section being disposed tangentially to the cam so as to ride on the cam surface, means being provided adjacent to the anchored position of the blade for flexing the blade whereby the end edge thereof engaging the cam surface may be shifted angularly relative to the axis of the cam and thereby change the angular position of the cam at which the blade end leaves the high portion of the step.
  • the resiliency of the blade is utilized to maintain the blade in engagement with the flexing means, which may consist of a screw threaded in an opening in a member carried on the base and abutting the spring arm.
  • the flexing means which may consist of a screw threaded in an opening in a member carried on the base and abutting the spring arm.
  • FIG. 1 is an end view of an electrical timer motor driven switching mechanism embodying the invention, a cover of the switching mechanism being removed and certain switch members being shown broken away;
  • FIG. 2 is a fragmentary view of the switching mechanism shown in FIG. 1, but illustrating certain switch members in different positions;
  • FIG. 3 is a View similar to FIG. 1, but showing certain contact members in still other positions;
  • FIG. 4 is a view taken substantially along line 4-4 of FIG. 1.
  • the switching mechanism is embodied in an electric motor driven timer which may be utilized to control sequential operation of an appliance, such as a clothes dryer, and is capable of controlling two electrical circuits so that after a predetermined period of operation of the timer one circuit is opened and the other is closed, and after a second predetermined period the first circuit is reclosed and the second is reopened. It is to be understood, however,
  • the timer shown includes an open side box type housing or base 10 formed of molded insulating material, such as Bakelite, and which may be closed by a suitable cover, which has been removed from the housing.
  • a cam 11 is rotatably supported within the housing by a shaft 12 which is driven at a suitable rate, such as one revolution per hour, by an electric constant speed synchronous motor operating through a gear reduction train, neither of which are shown inasmuch as such mechanisms are well known in the art and are not necessary to an understanding of the invention.
  • Cam 11 includes a slightly undercut step 13, the top and bottom of which are joined by a gradually rising slope 14. Provision may be made for rotating shaft 12 manually to set the timer for operation, but for sake of simplicity in this disclosure, this well known expediency is omitted.
  • the switch mechanism comprises three flat, b-lade type spring'members -15, 16 and 17 which are anchored at one end to housing 10 and their opposite ends carry contacts 15a, 16a (which is a double contact as shown), and 17a, respectively, which are disposed so that contact 16a can be engaged by either of contacts 15a or 17a, and the blades are all inherently biased toward the surface of cam 11.
  • Blades 15 and 17 are maintained separated by a spacer 18 formed of rigid insulating material and having the central portion extending through an opening through blade 16 and the opposite ends are reduced and extend through openings in blades 15 and 17, as best seen in FIG. 1.
  • the two outer blades are maintained in predetermined space relationship while contact 16a carried by blade 16 may be engaged by either of contacts 15a or 17a.
  • the end of blade 16 projecting beyond contact 16a overlies the end of blade 15 so that this end may ride on the high portion of the cam surface 14 after blade 15 has dropped to the low portion, as shown in FIG. 2.
  • the original circuits may be reestablished after a given period which is determined by the angular rotation of cam 11 required to traverse the high edge of step 13 from the end edge of blade 15 to the end edge of blade 16.
  • This angle is illustrated at a in FIG. 1, by lines representing planes intersecting the axis of the cam and passing through the end edges of blades 15 and 16 which engage cam surface 14.
  • the present invention resides in the provision of inexpensive means for accurately adjusting angle a," thereby providing for close setting of the time interval between the switch operations described.
  • Blades 16 and 17 are rigidly anchored at their left hand ends to terminal members 20 and 21, respectively, which are embedded or otherwise suitably attached to the housing or base 10 and which provide means for connecting the respective contact blades in the circuits desired to be controlled.
  • Blade 15 is bent in a generally L-shape form, having a vertically extending section 15c,
  • Section 15c is anchored by a rivet 15s to a bar 23 rigidly secured to housing 10, as by embedding in the material thereof.
  • a portion of blade section 15c is offset from the anchored portion and biased to engage the right hand of a screw 24 threaded in an opening formed through bar 23, the left hand end of which screw projects through an opening a through a side wall of housing 10 so as to be accessible for adjustment by a screwdriver.
  • section 150 of blade follows the end of the screw, flexing toward and from cam 11 and which, due to the angular form of the blade, causes section 15d to move longitudinally and shift the end edge 15b tangentially relative to the cam surface to thereby increase or decrease angle a, and adjustably varying the time interval at which blades 15 and 16 drop from step 13.
  • This adjustment is illustrated by the full and broken lines of FIG. 1 showing the portion of blade 15 riding on the cam surface in two different positions.
  • Angle a illustrates one angular adjustment providing one period of time between switch operations and angle b illustrates a shorter period effected by threading screw 24 inwardly.
  • blade 16 could be adjusted in a manner similar to that described with reference to the adjustment of blade 15 and such modification would be clearly within the scope of the invention.
  • an electric switching mechanism comprising a base, a cam rotatably supported on said base and having a switch actuating surface including a rise portion and a step, a pair of contact arms each arranged to have one end ride on said surface and to sequentially move between the extremities of said step as said cam is rotated to move said step beyond the end edges of said contact arms engaging said cam, one of said arms comprising a blade type spring member having one section at an angle of substantially less than 180 with the other section thereof, means to anchor said one section to said base whereby said other section extends tangentially of said cam and bears on said surface of said cam so that said one section may flex and shift said other section longitudinally, and means adjacent to said anchored end of said blade for adjustably flexing said section to shift the end of said one other section tangentially relative to said cam surface.
  • an electric switching mechanism comprising a base, a cam rotatably supported on said base and having a switch actuating surface including a rise portion and a step, a pair of contact arms each arranged to have one end ride on said surface and to sequentially move between the extremities of said step as said cam is rotated to move said step beyond the end edges of said contact arms engaging said cam, one of said arms comprising a resilient blade having one section at an angle of substantially less than with the other section thereof, means to anchor said one section to said base whereby the other section extends tangentially of said cam and bears on said surface of said cam so that said one section may flex and shift said other section longitudinally, means providing a threaded opening adjacent to the anchored portion of said one contact arm, and a screw threaded in said opening and having one end engaging said one section, said one section being spring biased against said end of said screw.
  • an electric switching mechanism comprising a base, a cam rotatably supported on said base and having a switch actuating surface including a rise portion and an abrupt step, a pair of contact arms each arranged to have one end ride on said surface and to sequentially snap move between the extremities of said step as said cam is rotated to move said step beyond the end edges of said contact arms engaging said cam, one of said arms comprising a resilient blade having one section at an angle of substantially less than 180 with the other section thereof, means to anchor said one section to said base whereby said other section extends tangentially of said cam and bears on said surface of said cam so that said one section may flex and shift said other section longitudinally, said means comprising a bar bracket member attached to said base, means attaching said one section of said one contact arm to said bracket, a screw threaded through an opening in said bar and engaging said one section and adapted to flex said one section and thereby move said other section of said one arm tangentially relative to said cam.
US824518A 1959-07-02 1959-07-02 Electric switch mechanism Expired - Lifetime US3018340A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
GB111/32A GB388532A (en) 1959-07-02 1932-01-02 Improvements in or relating to the reception of radio telephony, telegraphy or television
US824518A US3018340A (en) 1959-07-02 1959-07-02 Electric switch mechanism
ES0258279A ES258279A1 (es) 1959-07-02 1960-05-21 Un mecanismo de interrupciën electrico
DK227260AA DK104633C (da) 1959-07-02 1960-06-10 Elektrisk kontaktmekanisme.
CH674960A CH363701A (fr) 1959-07-02 1960-06-14 Interrupteur électrique
DER28170A DE1171496B (de) 1959-07-02 1960-06-18 Elektrische Schalteinrichtung mit einem drehbar gelagerten Nocken
FR830959A FR1260515A (fr) 1959-07-02 1960-06-23 Perfectionnements apportés aux dispositifs d'interrupteurs électriques à temps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US824518A US3018340A (en) 1959-07-02 1959-07-02 Electric switch mechanism

Publications (1)

Publication Number Publication Date
US3018340A true US3018340A (en) 1962-01-23

Family

ID=25241604

Family Applications (1)

Application Number Title Priority Date Filing Date
US824518A Expired - Lifetime US3018340A (en) 1959-07-02 1959-07-02 Electric switch mechanism

Country Status (7)

Country Link
US (1) US3018340A (fr)
CH (1) CH363701A (fr)
DE (1) DE1171496B (fr)
DK (1) DK104633C (fr)
ES (1) ES258279A1 (fr)
FR (1) FR1260515A (fr)
GB (1) GB388532A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293386A (en) * 1963-08-13 1966-12-20 Ebauches Sa Mechanically controlled electrical switch, especially for an alarm timepiece
US3477283A (en) * 1965-04-21 1969-11-11 Us Navy Ground surface hardness tester
US3779032A (en) * 1972-08-02 1973-12-18 Whirlpool Co Ice maker water fill control
US4004408A (en) * 1973-04-03 1977-01-25 Kienzle Uhrenfabriken Gmbh Mechanical improvement on an electric alarm clock
US5834718A (en) * 1997-03-03 1998-11-10 Emerson Electric Co. Appliance timer having a switching mechanism for high-current carrying circuit blades and associated method
EP2786393A4 (fr) * 2011-11-28 2015-05-27 Itron Inc Dispositif de commutation électrique haute puissance
US20180080423A1 (en) * 2016-09-22 2018-03-22 C.R.F. Società Consortile Per Azioni Fuel Electro-Injector Atomizer, In Particular For A Diesel Cycle Engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3719788A (en) * 1971-02-04 1973-03-06 Tektronix Inc Switch having ganged contacts mounted on opposite sides of circuit board

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504002A (en) * 1943-09-27 1950-04-11 Honeywell Regulator Co Stoker timer
US2562481A (en) * 1951-07-31 Timer mechanism
US2690526A (en) * 1950-10-09 1954-09-28 Paragon Electric Company Control means for defrosting refrigerators
US2736173A (en) * 1956-02-28 duncan

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1055088B (de) * 1957-01-28 1959-04-16 Heliowatt Werke Elek Zitaets A Einrichtung zur Einstellung eines Kontakttraegers gegenueber einem anderen Kontakttraeger
DE1748661U (de) * 1957-05-03 1957-07-18 Bergmann & Co Th Vorrichtung zum betaetigen eines kontaktes.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2562481A (en) * 1951-07-31 Timer mechanism
US2736173A (en) * 1956-02-28 duncan
US2504002A (en) * 1943-09-27 1950-04-11 Honeywell Regulator Co Stoker timer
US2690526A (en) * 1950-10-09 1954-09-28 Paragon Electric Company Control means for defrosting refrigerators

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3293386A (en) * 1963-08-13 1966-12-20 Ebauches Sa Mechanically controlled electrical switch, especially for an alarm timepiece
US3477283A (en) * 1965-04-21 1969-11-11 Us Navy Ground surface hardness tester
US3779032A (en) * 1972-08-02 1973-12-18 Whirlpool Co Ice maker water fill control
US4004408A (en) * 1973-04-03 1977-01-25 Kienzle Uhrenfabriken Gmbh Mechanical improvement on an electric alarm clock
US5834718A (en) * 1997-03-03 1998-11-10 Emerson Electric Co. Appliance timer having a switching mechanism for high-current carrying circuit blades and associated method
EP2786393A4 (fr) * 2011-11-28 2015-05-27 Itron Inc Dispositif de commutation électrique haute puissance
US20180080423A1 (en) * 2016-09-22 2018-03-22 C.R.F. Società Consortile Per Azioni Fuel Electro-Injector Atomizer, In Particular For A Diesel Cycle Engine

Also Published As

Publication number Publication date
DE1171496B (de) 1964-06-04
ES258279A1 (es) 1960-10-16
DK104633C (da) 1966-06-13
GB388532A (en) 1933-03-02
CH363701A (fr) 1962-08-15
FR1260515A (fr) 1961-05-05

Similar Documents

Publication Publication Date Title
US3018340A (en) Electric switch mechanism
US3260807A (en) Automatic and manual time switch
US2877317A (en) Switching mechanism for timer
US2578632A (en) Control device
US2832851A (en) Switch assembly
US3588391A (en) Plug-in twenty-four hour time switch
US4069658A (en) Alarm setting device for timepieces
US2458853A (en) Time controlled switch mechanism
US2838646A (en) Infinitely variable control switch
US2440142A (en) Time control device
US3227821A (en) Timing device with rotating cam operated micro-switch
US2673901A (en) Time switch
US3621172A (en) Switch-actuating means and adjustable camming construction
US2661404A (en) Circuit maker and breaker
US2824181A (en) Automatic and manual control time switch
US2242517A (en) Automatic electric time switch
US4186284A (en) Electrical switch assembly having rotary and axially operated switches
US2019157A (en) Automatic radio station selector
US2076371A (en) Time switch
US3515831A (en) Timing switch with means for urging a pair of contact arms into pressure engagement with a pivotal shaft and rotatable cam
US2364519A (en) Timing device
US2885500A (en) Momentary contact adapter for auxiliary switch
US3967078A (en) Time switch mechanism
US2555508A (en) Motor-driven switch
US3588394A (en) Switch actuating means