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Publication numberUS2040919 A
Publication typeGrant
Publication dateMay 19, 1936
Filing dateApr 7, 1932
Priority dateApr 7, 1932
Publication numberUS 2040919 A, US 2040919A, US-A-2040919, US2040919 A, US2040919A
InventorsCaldwell Samuel P
Original AssigneeEngineering & Res Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Circuit closer
US 2040919 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

M 19, 1936- s. P. CALDWELL 2,040,919



Patented May 19, 1936 UNITED STATES onwUrr cLosEa Samuel P. Caldwell; Hamden, Conn as'signor to The Engineering and Research Corporation,

New Haven, Conn., necticut a corporation of 0011- Application April 7, 1932, Serial No. 603,699

' 1 Claim. (01. 20 9-159) This invention relates to a functionallyand unitary and simple apparatus capable of operatv ing over long periods of time with freedom from mechanical or electrical difllculties.

A further object of the invention is that of furnishing a device of this character in which operation thereof will assure a complete and proper closing of the circuit and in which a structure is presented which will properly exclude moisture or foreign elements from the structure or thecircuit closer.

Another object is that of constructing a switch which may be conveniently operated by the hand of the user, although within the province of the present invention it might be otherwise operated.

With these and other objects in mind, referin which:

Fig. l is a sectional .side view; Fig. 2 is a plan view with certain of the parts broken away to disclose the underlying construction; Fig. 3 is a .sectional side view showing the switch proper:

Fig. 4 is a plan view-thereof but again having certain of the parts broken away to disclose the underlying construction; 1

Fig. 5 shows a form of construction slightly different from thatillustrated in Fig. 1.

In these several views the numeral It indicates the base of the unit and upon which a top or cap H may be mounted and secured asfor example, by screws II. The base I 0 may be formed with one or more openings, through which electrical leads i3 may extend, it being obvious that electric conductor conduits may be coupled to the casing at this point.

As shown in Figs. 1 and 2, the cap or top H may be formed with an opening defined by a centrally upstanding flange H which may terminate in an outstanding bead orlip l5. An actuating element in the form of a rod or pin I6 50 slidably extends through the cap opening and mounts at its upper end a head I! having a downwardly extending flange l8 which snugly embraces the flange l4, and more especially the lip I 5 thereof, without such contact, however,

ence is had to the attached sheet of drawings preventing relative movements of the parts. At

its lower end the actuating. element is enlarged as at I! for engagement with the switch proper.

This switch, in the embodiment illustrated, preferably takes the form of a relatively rigid and concave disc 20, to which one of the C011? ductors I3 is connected, this disc centrally mounting a contact stud if this appears desirable. Overlying the disc 20 is a contact element which may take the form of a resilient or flexible strip 22, the inherent tendency of which is to extend in spaced relation to the disc 20 or contact element 2 I, but which may be flexed into engagement with one of these elements. The second conductor I3 is secured to the strip 22 and with a view to normally preventingelectrical connection between the disc and strip, a body or layerof di-electric material, such as rubber 23, is interposed between these elements. Moreover, as shown in Fig. 4, layers of suitable material, such -as rubber, are provided above the strip and below the plate, and thus form a housing 24 which-after suitable vulcanization or other treatment-serves to efiectually enclose the switch mechanism and protect the same 'from the action of moisture, foreign materials, etc.

It is obvious from the foregoing that the operator, by simply pressing against the head It, may exert sufllclent pressure upon the strip 22 to cause the same to be flexed into contact with the element 2| or the plate 20, thus closing the circuit. Due to the construction provided, a unit is furnished in which there is a minimum probability of damage occurring to the parts, either due to abuses in operation or due to the action of the elements. The unit will have an extremely long life and if desired may be locked by, for example, positioning the bail of a padlock (indicated in dotted lines of Fig. 1) to extend between the top of the cap proper and the lower edge of the flange i5.

It will be noted that by the present construction the switch unit is supported, .for example, on the ledge or flange 24' of the base and is prevented from shifting by contact with the walls of the complementary recess forming a part of the cap. Also, as shown in Fig. 1, a proper channel is. provided through which the leads l3 maybe threaded.

In certain instances it may be desired to actuate the switch by other than by application of direct pressure. It is obvious that if this result is desired, the stem It may, for example, be pro vided with a pin 25 which rides against a ledge surface 26 formed in the interior of the cap and providing in' eil'ect a cam. Thus, by simply tuming the knob ll. the stem is caused to shift downhas wardly to an extent adequate to assure a closing of the circuit. At the end of its travel the pin may ride into a notchiormed in the surface 26, as shown in Fig. 5, so that a deliberate manipulation of the parts is necessary to thereupon eil'ect an opening 01' the circuit.- It is also apparent that it operation or the unit in this manner is desired,

a handle 21 may be secured to the knob for the purpose oi. facilitating a turning of the latter.

From the foregoing it will be understood that among others, the several objects of the invention as specifically aforenoted, are achieved. Obvious numerous changes in construction and rearrangements of the parts may be resorted to without departing from the spirit of the invention as defined by the claim.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

A circuit closer including a disk, a contact element extendingfrom said disk, an inherently resilient strip insulated from said element and extending from a point adjacent the edge of the disk across the same and to a point substantially diametrically opposite said first point, the ends of. said strip. being maintained substantially SAMUEL P, CAIDWELL.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2454060 *Sep 16, 1944Nov 16, 1948Bendix Aviat CorpRelay
US2719199 *Sep 29, 1950Sep 27, 1955Milwaukee Gas Specialty CoThermostat
US2783327 *Jan 17, 1955Feb 26, 1957Luckey John AMolded metal-backed electrical mat switch and method of making the same
US2812402 *Mar 30, 1954Nov 5, 1957Dixon Res IncElectrical switch construction
US2824183 *Oct 31, 1955Feb 18, 1958Nottingham & Co Inc J BCable connectors or couplers embodying novel circuit making and breaking devices
US2870287 *Feb 13, 1956Jan 20, 1959Aerojet General CoElectrical device
US2959713 *Nov 21, 1955Nov 8, 1960Minnesota Mining & MfgCircuit controlling device
US2995639 *Aug 28, 1957Aug 8, 1961Giuseppe PaneraiDevice for controlling from outside the members contained within a hermetically sealed box, apt to be immersed into a pressurized ambient
US2995640 *Aug 28, 1957Aug 8, 1961Giuseppe PaneraiDevice for controlling from outside a mechanical or electrical member contained in a pressure tight box or container, with no element passing through the box
US3218427 *May 20, 1963Nov 16, 1965Square D CoSanitary cover for selector switch
US3444850 *Aug 8, 1967May 20, 1969Horan John JVoltage-generation apparatus and ignition systems
US3582856 *Jun 18, 1969Jun 1, 1971Gen ElectricTemperature sensing relay
US3731031 *Mar 1, 1972May 1, 1973Burgess Micro Switch Co LtdOperating members for snap-action switches
US3872270 *Oct 3, 1973Mar 18, 1975Bond Charles RPneumatic flip-flop relay
US3879586 *Oct 31, 1973Apr 22, 1975Essex International IncTactile keyboard switch assembly with metallic or elastomeric type conductive contacts on diaphragm support
US3905233 *Mar 26, 1974Sep 16, 1975Us ArmyPackage penetration indicating apparatus
US4067102 *Mar 14, 1975Jan 10, 1978Essex International, Inc.Methods of manufacturing tactile switch for keyboards and the like
US4918271 *Jan 24, 1989Apr 17, 1990Standard Elektric Lorenz AgPushbutton type keyboard switch
EP0613160A2 *Apr 2, 1993Aug 31, 1994Cesare GalloneProtection device against water splashes for electric switches and the like
U.S. Classification200/517, 200/83.00B, 200/302.1
International ClassificationH01H19/00, H01H11/00, H01H9/28, H01H1/00, H01H1/64, H01H19/635, H01H9/20, H01H13/04, H01H13/06
Cooperative ClassificationH01H19/635, H01H9/281, H01H11/0018, H01H13/06, H01H1/64
European ClassificationH01H13/06