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Publication numberUS2142107 A
Publication typeGrant
Publication dateJan 3, 1939
Filing dateOct 16, 1937
Priority dateMar 12, 1937
Also published asDE736926C, US2099573, US2101092, US2101114, US2142155, US2175306
Publication numberUS 2142107 A, US 2142107A, US-A-2142107, US2142107 A, US2142107A
InventorsGeorge R Brown
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electric switch
US 2142107 A
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Description  (OCR text may contain errors)

Jan. 3, 1939.

G. R. BROWN ELECTRIC- SWITCH Filed Opt. 16, 1937 Inventor: George R. B own,

6. J Attorney.

Patented Jan. 3, 1939 ELECTRIC SWITCH George R. Brown, Stratford, Conn., assignor to General Electric Company, a corporation of New York Application October 16, 1937, Serial No. 169,497

14 Claims. 200152) The present invention relates to electric switches of the type having a liquid contact circuit closer for controlling the circuit through the switch.

The object of my invention is to provide an improved construction and arrangement in electric switches of this type, and for a consideration of what I believe to be novel and my invention, attention is directed to the following description and the claims appended thereto.

In the accompanying drawing, Fig. 1 is an elevation of a switch embodying my invention; Fig. 2 is a sectional top plan view of the switch; Fig. 3 is an exploded view of the switch; Fig. 4 is an end view of the switch handle; and Fig. 5 is a sectional elevation of the liquid contact circuit closer used in the switch.

Referring to Fig. 5, the circuit closer comprises an envelope I containing a limited quantity of mercury 2. The major portion of the envelope comprises opposed cup-shaped metal terminals 3 and 3*. Between the terminals is a diaphragm 4 of insulating material, for example, a ceramic, having an opening 5 therein through which the mercury flows to complete the circuit between the terminals. When the circuit closer is in the position illustrated, the circuit between the terminals is completed. When the circuit closer is rotated about the axis of the terminals a few degrees from the position illustrated, the opening 5 is raised clear of the mercury and the circuit between the terminals is broken by separation of the mercury in the opening 5 as it flows from each end thereof. In this latter position the diaphragm separates the mercury into two pools and insulates the terminals from each other. When the circuit closer is returned to the position illustrated, the circuit between the terminals is completed by the joining of mercury flowing into the opening 5 from each end thereof. The terminals 3 and 3 are provided with outwardly extending flanges l and 1 which fit in annular grooves 8 around the rim of the diaphragm. The diaphragm and terminals are sealed by a head or fillet 9 of glass which is fused to the flanges I and l and to the outer periphery of the diaphragm. The above described construction is that shown in Payne Patent No. 2,101,092. g

The circuit closed is mounted within a housing I0 of suitable molded insulating material which is closed at its lower end and which has a metal cover plate H at its upper end. The cover plate is provided with ears l2 which are bent around projections l3 on the housing to secure the cover against the inner surface of the cover plate 10 In the enlarged portion I8 is a recess I9 in which fits the terminal 3 of the circuit closer. The recess is provided with a projection 20 which fits in a complementary depression 2| in the circuit closer terminal and prevents rotation of the circuit closer relative to the handle. Between the inner end of the enlarged portion I8 and the flange 1 of the terminal 3 is a contact ring 22 having a cylindrical flange 23 which bears on the cylindrical surface of the terminal and outwardly extending flange 24 which bears against the flange l of the terminal. The contact ring has a tab 25 which slidably fits in a groove 26 in the housing and prevents rotation of the contact ring relative to the housing. The bottom wall of 25 the groove 26 is cut away to provide an opening 21 through which extends a conductor 28 suitably connected to the tab 25. On the other circuit closer terminal 3 is another contact ring 29 of the same construction as the contact ring 22. 30

It has a cylindrical flange 30 bearing on the terminal, an outwardly extending flange 3| bearing against the flange 1 of the terminal and a tab 32 slidable in a groove 33 in the housing.

The bottom wall of the groove 33 is cut away to 5 provide an opening 34 through which extends a conductor 35 connected to the tab 32. The edges of flanges 24 and 3| slidably engage the housing and therefore assist in supporting the circuit closer therein. The tabs 25 and 32 prevent rotation of the contacts 23 and 30 in the housing. Between the flange 3| of the contact ring 29 and the bottom of the housing I0 is a helical compression spring 36 which holds the circuit closer in the recess l9 of the handle. There is sufficient clearance between the bottom of the recess l9 and the adjacent surface of the circuit closer terminal so that the outer edge of the flange 23 is held against the adjacent face of the enlarged portion I8 of the handle. Since the contact rings 22 and 29 are slidable in the housing the pressure of the spring 36 causes the flanges 24 and 3| to be held against the adjacent flanges and '1 of the circuit closer terminals.

In the cover plate I and the adjacent surface of the enlarged portion l8 of the handle are diametrically opposite projections and depressions 31 and 38. The projections are illustrated as formed in the cover plate and the projections as formed in the handle although it is obvious that the positions of these parts could be reversed. The projections and depressions are in effect hill-and-valley portions which resiliently hold the handle in positions 180 apart. In one of these positions the opening 5 is submerged in the mercury and the circuit is completed between the circuit closer terminals. In the other of these positions the opening 5 is raised above the mercury and the circuit between the circuit closer terminals is interrupted. When the handle is between these positions the projections 31 engage the surface of the enlarged portion l8 of the handle and cause the handle, the circuit closer, and the contact rings 22 and 28 to be moved toward the bottom of the housing l0 against the compression of the spring 36. When the handle is rotated to a position in which the depressions 38. are opposite the projections 31 the handle, the circuit closer, and the contact rings 22 and 23 are moved toward the cover plate II by the spring 36 with a snap action.

As shown in Fig. 1 the conductors 28 and 35 are wrapped around one side of the switch housing l0 and extended between tabs 39 on an arm 40 integral with the cover plate II. The tabs 39 are bent over the conductors clamping the conductors to the arm and holding the conductors in place.

In the use of the switch the handle I! is rotated in 180 steps movingthe circuit closer to on and off positions with a snap action as described above.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In an electric switch, a liquid contact circuit closer having an envelope including opposed thin-walled cup-shaped terminals, outwardly extending flanges on said terminals, means including contact rings fitting over the hollow portions of said terminals and bearing on said flanges for rotatably supporting the circuit closer, and means for rotating the circuit closer in said contact rings.

2. In an electric switch, a liquid contact circuit closer having thin-walled hollow cylindrical terminals, means including contact rings fitting over the hollow portions of said terminals for rotatably supporting said circuit closer, and means for rotating the circuit closer in said contact rings.

3. In an electric switch, opposed contacts, a liquid contact circuit closer having terminals journaled in said contacts, a frame having provisions for supporting the contacts for axial movement therein, means for rotating the circuit closer relative to said contacts, and hill-andvalley means causing axial movement of the contacts for resiliently holding the circuit closer in predetermined positions.

4. In an electric switch, a frame having a sleeve, a spindle rotatably carried in the sleeve having a handle atthe outer end of the sleeve and havingan enlarged portion at the inner end or the sleeve, a recess in said enlarged portion, a liquid contact circuit closer non-rotatably car-\ ried in the recess, and means including hill-andvalley portions on said enlarged portion for resiliently holding the spindle in predetermined positions.

5. man electric switch, a frame having a sleeve, a spindle rotatably carried in the sleeve and having a handle at one end of the sleeve and an enlarged portion at the other end of the sleeve, a recess in the end of said enlarged portion, a liquid contact circuit closer having opposed terminals, one of said terminals nonrotatably fitting in said recess, and means for yieldingly holding said terminal in said recess whereby the circuit closer is supported in th spindle.

6. In an electric switch, a frame having a sleeve, a spindle slidably and rotatably carried in the sleeve having a handle projecting beyond the outer end of the sleeve and an enlarged portion projecting beyond the inner end of the sleeve, said enlarged portion bearing against an adjacent part of the frame, a recess in the end of the enlarged portion, a liquid contact circuit closer non-rotatably fitting in said recess, spring means arranged between the frame and the circuit closer for holding the circuit closer in the recess, and hill-and-valley means on the enlarged portion of the spindle and the adjacent part of the frame for resiliently holding the spindle in predetermined positions.

'7. In an electric switch, a liquid contact circuit closer having opposed thin-walled hollow termi-' nals, contact rings fitting over the hollow portions of the terminals, a housing having parts engaging the outer edges of the rings whereby the circuit closer is supported in the rings, and means for rotating the circuit closer in the contact rings.

8. In an electric switch, a housing, contact rings slidably and non-rotatably carried in said housing, -a liquid contact circuit closer having terminals journaled in said rings, a handle for rotating the circuit closer, a spring for urging the contact rings and circuit closer in an axial direction, and hill-and-valley means resiliently held in engagement by said spring for resiliently holding the circuit closer in predetermined positions.

9. In an electric switch, spaced contact rings, a liquid contact circuit closer having a part between said rings and having terminals journaled in the rings, a frame in which said rings are slidably and non-rotatably carried, means including a spring exerting a pressure along the axis of the circuit closer terminals for holding the contact rings and circuit closer in assembled relation, a handle for rotating the circuit closer in the contact rings, and hill-and-valley means resiliently held in engagement by the pressure of said spring for resiliently holding the circuit closer in predetermined positions. f

10. In an electric switch, a liquid contact circuit closer having opposed terminals, contact rings in which the terminals are journaled, a housing having provisions for non-rotatably supporting the contact rings and for permitting movement of the contact rings therein along the axis of the circuit closer terminals, a spring exerting a pressure along the axis of the circuit closer terminals for holding the circuit closer and contact rings in assembled relation, a handle for rotating the circuit closer in the contact rings, and hill-and-valley means resiliently held in engagement by said spring for yieldingly holding the circuit closer in predetermined positions.

1l.- In an electric switch, spaced contacts, a liquid contact circuit closer held between the contacts and having terminals journaled therein, spring means forholding the contacts and circuit closer'in assembled relation, means for rotating the circuit closer in the contacts, and hilland-valley means acting against said spring means for resiliently holding the circuit closer in predetermined positions.

12. In an electric switch, a liquid contact circuit closer having thin-wall hollow-cylindrical terminals, means including contact rings fitting over hollow portions of said terminals for rotatably supporting the circuit closer, and a handle having a recess in which one of the circuit closer terminals is non-rotatably carried for rotating the circuit closer in said contact rings.

13. In an electric switch, a liquid contact circuit closer having opposed thin-walled hollow cylindrical terminals and a projecting portion therebetween, contacts on each side of the projecting portion of the circuit closer in which the hollow portions of the terminals are respectively journaled, and spring means for holding the contacts against said projecting portion whereby the circuit closer is rotatably supported in said contacts.

14. In an electric switch, a liquid contact circuit closer having opposed terminals, spaced contacts in which the terminals are rotatably supported, a housing, a handle adjacent one wall of the housing non-rotatably engaging one of said terminals, and means including a spring for holding the handle against said wall and for holding the handle and contacts in assembled relation.

GEORGE R. BROWN.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2451751 *May 19, 1944Oct 19, 1948Honeywell Regulator CoSwitch device
US2575318 *Jan 8, 1948Nov 13, 1951Minncapolis Honeyweel RegulatoMercury switch
US3045080 *Oct 2, 1958Jul 17, 1962Carter Parts CompanyTwin electrical devices
US3161738 *May 5, 1960Dec 15, 1964Hall William DSwitch adapted to rest on a table or other flat surface
US7807936 *Apr 29, 2008Oct 5, 2010Donghee Industrial Co., Ltd.Device for mounting a pedal switch to a vehicle
Classifications
U.S. Classification200/217, 174/138.00R, 200/296, 220/3.2, 220/3.8, 200/336
International ClassificationH01H29/24, H01H29/20, H01H11/02
Cooperative ClassificationH01H29/24, H01H29/20, Y10S53/03, H01H11/02
European ClassificationH01H29/24, H01H11/02, H01H29/20