Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3578926 A
Publication typeGrant
Publication dateMay 18, 1971
Filing dateDec 4, 1969
Priority dateDec 4, 1969
Also published asDE7040848U
Publication numberUS 3578926 A, US 3578926A, US-A-3578926, US3578926 A, US3578926A
InventorsGeorge Obermann
Original AssigneeControls Co Of America
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Snap switch
US 3578926 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

United States Patent lnventor George Obermann Niles, 11].

Dec. 4, 1969 May 18, 1971 Controls Company of America Melrose Park, Ill.

App]. No. Filed Patented Assignee SNAP SWITCH 3 Claims, 3 Drawing Figs.

US. Cl 200/67 Int. Cl H01h 13/36 Field of Search 200/67 (D), 67; 74/100 (P) References Cited UNITED STATES PATENTS 8/1951 Van Ryan et al. 200/67D(UX) 2,571,453 10/1951 Jackson ..200/67D(UX) Primary Examiner-David Smith, Jr.

Attorneys-John W. Michael, Gerrit D. Foster, Bayard H.

Michael, Paul R. Puerner, Joseph A. Gemignani, Andrew 0. Riteris, Daniel VanDyke and Spencer B. Michael ABSTRACT: The compressed tongue of the switch blade is pivoted on the fixed support member while the side tails are under tension. The actuated end of the blade has integral pivot arms bent at 90 from the plane of the blade and pivoted on ears projecting from the support member. When the plunger is depressed, the side rails pass the pivot point of the tongue and cause the contact carrying end of the blade to snap downwardly. The construction affords considerable overtravel with no adverse effect on contact pressure. The switch provides a high degree of contact wiping.

Patented May 18, 1971 3,578,926

/mb7w SNAP swrrcn BACKGROUND OF INVENTION This general type of switch has been known for its long life, high reliability, high contact wiping, siderable overtravel. The closest prior art would be Kaminky U.S. Pat. No. 2,486,033 but that construction, while successful, had more parts and was considerably more difficult to assemble than the present design.

' SUMMARY OF INVENTION DESCRIPTION OF DRAWINGS FIG. I is a vertical view with one side of the case removed. FIG. 2 is a plan view of the blade and its support. FIG. 3 is a perspective view of the blade per se.

DESCRIPTION OF PREFERRED EMBODIMENT The housing supports two fixed terminals l2, l4 respectively provided with silvered contacts l6, 18. Also mounted in the housing is a fixed terminal which includes a support member 22, the' upper end of which is received in a cooperatrelative to the housing and, of course, relative to the contacts 16 and 18. The support member 22 is provided with laterally projecting pivot cars 24 upon which the blade pivot arms 26 are mounted. The pivot arms are integral with and bent down from the blade member 28, the actuated end of which (the left end in the drawings) has a crosspiece acted upon by the balllike end of plunger 30. The side rails 32 of the blade 28 pass on either side of the support member 22 and at the moving end (the right end) are joined by a crosspiece upon which the blade contact 34 is mounted. The compressed, bowed tongue 36 extends from the contact end of the blade back towards the support member and is pivoted in a suitable notch in the support member.

As can be seen in the drawings, the side rails normally lie above the pivot point of torque 36. The rails are in tension. The tongue and arms 26 are in compression. This results in a force on the pivot arms 26 tending to move the arms upwardly or clockwise about pivot 24, moving the plunger to its uppermost position. Also, the tongue, being under compression, exerts a force tending to move the free or contact end of the blade upwardly and thus holding the blade contact 34 against the upper fixed contact 18. As the plunger 30 is depressed, the actuated end of the blade moves down about pivot 24 and the rails move past the plane of the pivot of tongue 36. Once past and provision of coning slot in the interior of the housing to locate the member the centerline, the rails will cause the force developed by the compressed tongue to move the blade contact 34 away from the upper contact and down to the lower contact with a snap action. The rails never move below the pivot 24 so the force on the plunger is always upward and .the switch must be held in the actuated position. As the rails go towards the overcenter position, the torque must be bowed more and this causes a wiping action between the moving contact and the fixed contact which acts to break any weld.

Since the pivot anns are integral with the blade, the distance between the arm pivot point (24) and the actuating point can be accurately controlled. Pivots 24 are formed in stamping the support member. The positioning of the support member in the housing insures accurate location of the pivot. Arms 26 operate in unison to eliminate or minimize any twisting tendency of the actu'ated end of the blade. There are but eight parts in the entire assembly. Assembly is very simple.

After the rails pass over center as the plunger IS depressed,

considerable further movement (overtravel) can occur without any adverse effect on contact pressure, the contact pressure being developed by the compressed tongue. The switch will, of course, always tend to return to the illustrated position.

Greater accuracy is possible than in the prior art while realizing lower costs and high reliability.

Iclaim:

l. A snap switch comprising:

a housing,

a support member mounted in the housing and including projecting ears,

an overcenter blade including a compression tongue and spaced tension members, said tension members being interconnected at opposite ends,

a contact carried at one of the interconnected ends of the tension members and being free to move between preselected positions with a snap action, the other interconnected ends of the tension members being the actuated end of the blade,

said tongue being integral with the contact end of the blade and projecting toward and being pivoted on said support,

arms integral with the actuated end of the blade and being bent down at about to the plane of the blade and projecting from the blade end parallel to the tension members with holes pivotally mounted on said support ears, said arms being in compression and functioning in unison as a rigid beam pivotally supporting said blade, and

a plunger in the housing acting on said actuated end to move the tension members relative to the tongue pivot whereby the free end of the blade moves between said preselected positions with a snap action.

2. A snap switch according to claim 1 in which the preselected positions are determined by contacts carried by terminals fixed in and projecting from the housing.

3. A snap switch according to claim 3 in which the support is integral with a terminal fixed in and projecting from the housing.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2565790 *Sep 27, 1948Aug 28, 1951Mcgraw Electric CoSnap switch
US2571453 *Apr 30, 1949Oct 16, 1951Cyril Kieft And Company LtdElectric switch
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3809834 *Apr 17, 1972May 7, 1974Robertshaw Controls CoSnap switch construction and snap blade therefor or the like
US4130747 *Oct 12, 1977Dec 19, 1978Mcgill Manufacturing Company, Inc.Miniature overtravel snap action switch with pivotal cam mounting for the switch blade
US4224488 *Jul 14, 1978Sep 23, 1980Ranco IncorporatedElectrical switch devices
US4362910 *Dec 31, 1980Dec 7, 1982Ark-Les CorporationElectrical switch
US4471182 *Mar 10, 1983Sep 11, 1984The Singer CompanySingle pole make make switch and pressure switch using same
US7932475Apr 11, 2008Apr 26, 2011Zf Friedrichshafen AgElectric switch
WO2008125636A1 *Apr 11, 2008Oct 23, 2008Cherry GmbhElectric switch
Classifications
U.S. Classification200/452
International ClassificationH01H13/42, H01H13/26
Cooperative ClassificationH01H1/18, H01H13/42
European ClassificationH01H13/42, H01H1/18
Legal Events
DateCodeEventDescription
Oct 8, 1986ASAssignment
Owner name: EATON CORPORATION, EATON CENTER, 1111 SUPERIOR AVE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CONTROLS COMPANY OF AMERICA;REEL/FRAME:004614/0433
Effective date: 19861002
Jan 17, 1986ASAssignment
Owner name: CONTROLS COMPANY OF AMERICA, 9655 W. SORENG AVENUE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:004505/0515
Effective date: 19860110