US3299225A - Rotary switch with improved contact structure and camming means - Google Patents
Rotary switch with improved contact structure and camming means Download PDFInfo
- Publication number
- US3299225A US3299225A US532997A US53299766A US3299225A US 3299225 A US3299225 A US 3299225A US 532997 A US532997 A US 532997A US 53299766 A US53299766 A US 53299766A US 3299225 A US3299225 A US 3299225A
- Authority
- US
- United States
- Prior art keywords
- contact
- arm
- cam
- engagement
- arms
- 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
Links
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 1
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
Definitions
- This invention relates to a rotary switch comprising a movable contact arm adapted to be moved relative to a fixed contact by a rotor.
- a rotary electrical switch comprises a rotatable cam, at least one pivotally mounted contact carrying arm engageable by the cam so as to be displaced thereby into and out of engagement with a fixed contact, resilient means being provided engaging the arm adjacent to its pivot so as to resiliently urge the arm against the cam.
- a pair of opposed fixed contacts may be provided, the contact on the movable arm being movable under the control of the cam into engagement with each of the fixed contacts or into an intermediate position out of engagement with both said contacts.
- the cam may be adapted to engage an intermediate portion of the arm.
- the resilient means comprises a spring engageable with the arm adjacent to its pivotally mounted end.
- the switch comprises a casing 1 and a cover 2 in which are mounted fixed contacts 3, 3a, 4, 4a, the portions of the contacts projecting into the casing being provided with contact pips b.
- the pips b of the contacts 3, 3a as also those of the contacts 4, 4a, are in opposed facing relation.
- Movable contact arms 5, 6 are provided having double faced contact pips 5a, 6a at one end. At the opposite end the respective arms are formed with lugs 7, 8, pivotally supported in slots 9 in contact members 10.
- Each of the contact arms is provided with resilient means urging it towards the cam surface 11 of a rotor 12.
- each resilient means comprises a coil spring 13 housed in a shroud 14 of rubber or other flexible insulating material and formed with a projection 15 at one end extending into an aperture in the respective contact arms adjacent to the pivotal mounting thereon.
- the springs 13 normally tend to extend the shrouds so as resiliently to urge the contact arms towards the cam surface 11 so that the ar-cuately bent portions 16 of the respective arms are maintained in contact with the cam surface 11 as the rotor rotates.
- the contact members are formed with tailpieces 17 projecting outwardly of the switch casing for connection to lead wires to complete a circuit to the respective arms 5 and 6. It will be noted that the shrouds 14 insulate the contact arms from the springs 13.
- the fixed contacts 3, 3a, 4, 4a are also adapted to be attached to lead wires, and accordingly during the rotation of the rotor 12, when the high portions of the cam 11 engages the portions 16 of the arms 5 and 6 respectively, they will be displaced against the action of their respective springs 13 into engagement with the fixed contacts 3, and 4.
- the arms When the recessed or low portion of the cam is aligned with the portion 16, the arms will be positioned in engagement with the fixed contacts 3a, 4a, and when the portion of the cam intermediate the high and recessed portion is aligned with the bent portion 15, the contact arms will be in an intermediate position out of engagement with both the fixed contacts.
- the springs 13 not only serve to urge the arms into resilient engagement with the cam surface 11 of the rotor, but also serve to absorb any pressure exerted on the contact arms in excess of that necessary to effect the efficient electrical engagement of the pips of the arms 5, 6 with the pips of the fixed contacts.
- switch illustrated and described is provided with two movable contacts each engageable with two fixed contacts, it will be understood that the switch may include one, or more than two movable contacts, each engageable with a single or a pair of contacts.
- a rotary electrical switch comprising a rotatable cam, mounted in a casing, at least one contact arm pivotally mounted, at one end, in said casing, the opposite end being provided with an electrical contact for engagement with a fixed contact, said contact arm engageable by said cam so as to be displaceable thereby to position said electrical contact into and out of engagement with said fixed electrical contact, spring means enclosed in a flexible housing of insulating material provided adjacent the pivot end of said arm to urge an intermediate portion of said arm into engagement with said cam, the action of said spring means being transmitted through said housing to said arm.
Description
Jan. 17, 1967 c, w, HEATH 3,299,225
ROTARY SWITCH WITH IMPROVED CONTACT STRUCTURE AND CAMMING MEANS Filed March 9, 1966 INVENTOR CLfiRE/VCE W/Lm/vs hEHTH.
ATTORNEY United States Patent 3,299,225 ROTARY SWITCH WITH IMPROVED CONTACT STRUCTURE AND CAMMING MEANS Clarence Willans Heath, Bleasby, England, assignor to United-Carr Incorporated, Boston, Mass., a corporation of Delaware Filed Mar. 9, 1966, Ser. No. 532,997 Claims priority, application Great Britain, Mar. 31, 1965, 13 637 2 Claims. (Cl. 2006) This invention relates to a rotary switch comprising a movable contact arm adapted to be moved relative to a fixed contact by a rotor.
According to the present invention, a rotary electrical switch comprises a rotatable cam, at least one pivotally mounted contact carrying arm engageable by the cam so as to be displaced thereby into and out of engagement with a fixed contact, resilient means being provided engaging the arm adjacent to its pivot so as to resiliently urge the arm against the cam.
A pair of opposed fixed contacts may be provided, the contact on the movable arm being movable under the control of the cam into engagement with each of the fixed contacts or into an intermediate position out of engagement with both said contacts.
The cam may be adapted to engage an intermediate portion of the arm.
Preferably the resilient means comprises a spring engageable with the arm adjacent to its pivotally mounted end.
To enable the invention to be fully understood, it will now be described, by way of example, with reference to the accompanying drawing which schematically illustrates a rotary switch according to one embodiment of the invention.
As shown in the said drawing, the switch comprises a casing 1 and a cover 2 in which are mounted fixed contacts 3, 3a, 4, 4a, the portions of the contacts projecting into the casing being provided with contact pips b. AS shown, the pips b of the contacts 3, 3a as also those of the contacts 4, 4a, are in opposed facing relation.
The contact members are formed with tailpieces 17 projecting outwardly of the switch casing for connection to lead wires to complete a circuit to the respective arms 5 and 6. It will be noted that the shrouds 14 insulate the contact arms from the springs 13.
The fixed contacts 3, 3a, 4, 4a are also adapted to be attached to lead wires, and accordingly during the rotation of the rotor 12, when the high portions of the cam 11 engages the portions 16 of the arms 5 and 6 respectively, they will be displaced against the action of their respective springs 13 into engagement with the fixed contacts 3, and 4. When the recessed or low portion of the cam is aligned with the portion 16, the arms will be positioned in engagement with the fixed contacts 3a, 4a, and when the portion of the cam intermediate the high and recessed portion is aligned with the bent portion 15, the contact arms will be in an intermediate position out of engagement with both the fixed contacts.
The springs 13 not only serve to urge the arms into resilient engagement with the cam surface 11 of the rotor, but also serve to absorb any pressure exerted on the contact arms in excess of that necessary to effect the efficient electrical engagement of the pips of the arms 5, 6 with the pips of the fixed contacts.
It will be understood that if the pressure is excessive, there would be a tendency for the contact arms 5 and 6 to be overstressed mechanically so as to cause them to break or assume a set which will impair the efiicient operation of the switch.
While the switch illustrated and described is provided with two movable contacts each engageable with two fixed contacts, it will be understood that the switch may include one, or more than two movable contacts, each engageable with a single or a pair of contacts.
I claim:
1. A rotary electrical switch comprising a rotatable cam, mounted in a casing, at least one contact arm pivotally mounted, at one end, in said casing, the opposite end being provided with an electrical contact for engagement with a fixed contact, said contact arm engageable by said cam so as to be displaceable thereby to position said electrical contact into and out of engagement with said fixed electrical contact, spring means enclosed in a flexible housing of insulating material provided adjacent the pivot end of said arm to urge an intermediate portion of said arm into engagement with said cam, the action of said spring means being transmitted through said housing to said arm.
2. A rotary electrical switch as set forth in claim 1 wherein said contact arm has an aperture formed therethrough in close proximity to said pivotal end and said spring means has means engaged in said aperture formed in said contact arm.
References Cited by the Examiner UNITED STATES PATENTS 2,262,306 11/ 1941 Thompson 2006 2,832,851 4/1958 Jones 2006 3,241,381 3/1966 Kuhn et al 74-97 ROBERT K. SCHAEFER, Primary Examiner. J. SCOTT, Assistant Examiner.
Claims (1)
1. A ROTARY ELECTRICAL SWITCH COMPRISING A ROTATABLE CAM, MOUNTED IN A CASING, AT LEAST ONE CONTACT ARM PIVOTALLY MOUNTED, AT ONE END, IN SAID CASING, THE OPPOSITE END BEING PROVIDED WITH AN ELECTRICAL CONTACT FOR ENGAGEMENT WITH A FIXED CONTACT, SAID CONTACT ARM ENGAGEABLE BY SAID CAM SO AS TO BE DISPLACEABLE THEREBY TO POSITION SAID ELECTRICAL CONTACT INTO AND OUT OF ENGAGEMENT WITH SAID FIXED ELECTRICAL CONTACT, SPRING MEANS ENCLOSED IN A FLEXIBLE HOUSING OF INSULATING MATERIAL PROVIDED ADJACENT THE PIVOT END OF SAID ARM TO URGE AN INTERMEDIATE PORTION OF SAID ARM INTO ENGAGEMENT WITH SAID CAM, THE ACTION OF SAID SPRING MEANS BEING TRANSMITTED THROUGH SAID HOUSING TO SAID ARM.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB13637/65A GB1089887A (en) | 1965-03-31 | 1965-03-31 | Rotary switch |
Publications (1)
Publication Number | Publication Date |
---|---|
US3299225A true US3299225A (en) | 1967-01-17 |
Family
ID=10026654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US532997A Expired - Lifetime US3299225A (en) | 1965-03-31 | 1966-03-09 | Rotary switch with improved contact structure and camming means |
Country Status (2)
Country | Link |
---|---|
US (1) | US3299225A (en) |
GB (1) | GB1089887A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3493696A (en) * | 1968-04-18 | 1970-02-03 | Square D Co | Modular selector switch assembly |
US3496314A (en) * | 1967-08-22 | 1970-02-17 | Collins Radio Co | Switch mechanism |
US3497643A (en) * | 1967-05-12 | 1970-02-24 | United Carr Inc | Rotary switch |
US3619520A (en) * | 1969-03-04 | 1971-11-09 | Emerson Electric Co | Ballast circuit and switch therefor |
US3621157A (en) * | 1969-02-18 | 1971-11-16 | Mc Graw Edison Co | Miniature switch with multiple cam-operated switch contacts |
US3800109A (en) * | 1971-07-24 | 1974-03-26 | United Gas Industries Ltd | Manual control for gas and electric controlled apparatus |
US6570108B2 (en) * | 2001-08-23 | 2003-05-27 | Primax Electronics Ltd. | Mouse switch mechanism for determining a rotational direction of a ratchet on a pointing device |
US20030155191A1 (en) * | 2002-02-15 | 2003-08-21 | Samuel Lin | Automatic brake device for an electric scooter |
US20040124072A1 (en) * | 2002-09-10 | 2004-07-01 | Shaodong Chen | Switch for controlling a range of movement |
US20090057123A1 (en) * | 2007-08-27 | 2009-03-05 | Makita Corporation | Clockwise and counterclockwise rotation switching device for power tool |
US20120125910A1 (en) * | 2010-11-22 | 2012-05-24 | General Electric Company | Voltage switching microswitch for hot surface igniter system |
CN103487072A (en) * | 2012-06-08 | 2014-01-01 | 博西华电器(江苏)有限公司 | Household electric appliance, gear detection device thereof and combination of household electric appliance, cooker and smoke exhaust ventilator |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2262306A (en) * | 1940-09-03 | 1941-11-11 | Pacific Electric Mfg Corp | Auxiliary circuit controlling switch |
US2832851A (en) * | 1956-10-10 | 1958-04-29 | Maytag Co | Switch assembly |
US3241381A (en) * | 1962-02-28 | 1966-03-22 | Cutler Hammer Inc | Motion transmitting mechanism |
-
1965
- 1965-03-31 GB GB13637/65A patent/GB1089887A/en not_active Expired
-
1966
- 1966-03-09 US US532997A patent/US3299225A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2262306A (en) * | 1940-09-03 | 1941-11-11 | Pacific Electric Mfg Corp | Auxiliary circuit controlling switch |
US2832851A (en) * | 1956-10-10 | 1958-04-29 | Maytag Co | Switch assembly |
US3241381A (en) * | 1962-02-28 | 1966-03-22 | Cutler Hammer Inc | Motion transmitting mechanism |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3497643A (en) * | 1967-05-12 | 1970-02-24 | United Carr Inc | Rotary switch |
US3496314A (en) * | 1967-08-22 | 1970-02-17 | Collins Radio Co | Switch mechanism |
US3493696A (en) * | 1968-04-18 | 1970-02-03 | Square D Co | Modular selector switch assembly |
US3621157A (en) * | 1969-02-18 | 1971-11-16 | Mc Graw Edison Co | Miniature switch with multiple cam-operated switch contacts |
US3619520A (en) * | 1969-03-04 | 1971-11-09 | Emerson Electric Co | Ballast circuit and switch therefor |
US3800109A (en) * | 1971-07-24 | 1974-03-26 | United Gas Industries Ltd | Manual control for gas and electric controlled apparatus |
US6570108B2 (en) * | 2001-08-23 | 2003-05-27 | Primax Electronics Ltd. | Mouse switch mechanism for determining a rotational direction of a ratchet on a pointing device |
US6609596B1 (en) * | 2002-02-15 | 2003-08-26 | Samuel Lin | Automatic brake device for an electric scooter |
US20030155191A1 (en) * | 2002-02-15 | 2003-08-21 | Samuel Lin | Automatic brake device for an electric scooter |
US20040124072A1 (en) * | 2002-09-10 | 2004-07-01 | Shaodong Chen | Switch for controlling a range of movement |
US6864439B2 (en) * | 2002-09-10 | 2005-03-08 | Positec Power Tools (Suzhou) Co. Ltd. | Switch for controlling a range of movement |
US20090057123A1 (en) * | 2007-08-27 | 2009-03-05 | Makita Corporation | Clockwise and counterclockwise rotation switching device for power tool |
US8143547B2 (en) * | 2007-08-27 | 2012-03-27 | Makita Corporation | Clockwise and counterclockwise rotation switching device for power tool |
RU2472611C2 (en) * | 2007-08-27 | 2013-01-20 | Макита Корпорейшн | Device to change from clockwise rotation to counter clockwise rotation of electrically driven tool |
US20120125910A1 (en) * | 2010-11-22 | 2012-05-24 | General Electric Company | Voltage switching microswitch for hot surface igniter system |
US8878104B2 (en) * | 2010-11-22 | 2014-11-04 | General Electric Company | Voltage switching microswitch for hot surface igniter system |
CN103487072A (en) * | 2012-06-08 | 2014-01-01 | 博西华电器(江苏)有限公司 | Household electric appliance, gear detection device thereof and combination of household electric appliance, cooker and smoke exhaust ventilator |
Also Published As
Publication number | Publication date |
---|---|
GB1089887A (en) | 1967-11-08 |
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