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.


  1. Advanced Patent Search
Publication numberUS963301 A
Publication typeGrant
Publication dateJul 5, 1910
Filing dateMay 8, 1909
Priority dateMay 8, 1909
Publication numberUS 963301 A, US 963301A, US-A-963301, US963301 A, US963301A
InventorsHenry E Leppert
Original AssigneeHart Mfg Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 963301 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

" Patented July 5, 191'0.




New Brit-ain,v county'of Hart-ford, State of. Connecticut, have-invented certain; new anduseful Improvements CircnitCont-rollers, of 'which the following a `full ,'clea r`, and exact description. f-

My invention'rela'tes to'leleotri'c circuit'V controllers and has foritsl object to produce a new and improved' device forl controlling an electric circuit by'nie'ans ofla' push button,'and means for "adjusting'th'e same so that the throw necessary for`- makingthe contact may be increased or diminished, as de.A

' 'sired. It is particularly designed to be'used "for controlling a circuit by means of a'door bolt; The adjustment above referred to is desirableinasmuch' as it is diilicult to in-v stall suc devices 'with absolute precision, .and'furthermore the door or. the' jamb' may I shrink or warp Aso that in time' therelations' of the lparts will not' be .those necessary 'for' the producing of' the r'desired results even v thoughsuch resultsjwercdproduced when the contactwasirstinstalle The following is 'a description of. my invention, reference beingA had tothe accom?-l panyngdrawhg.' in which,

' igure 1 'is a' side elevation of a circuitv controller embodying my invention showing 'its -t`elationwhen installed `so a's'ltofbe op-` eratcd by the bolt' of a door lock.. Fig. ,2

is a longitudinal section of the same with the metallic casing removed, on `the line y :vf-4v Fig. .4. Fig. 3 is a cross section of Fig. ton. shown L of'the same. Y details of the top-plate, plunger, and baseplate.

, Referring more particularly to the draw-A .being made of.porcelain er1-other suitable .55 linsulated material.'


Spec-cation'of Letters P atend "Applifioa med may ai,l i999.. serial No. 494,903.

to extendacrossj the'topsof the'walls-of the adjusting' screw-driver'at its outer end, can. be' turned 90 1' through the center of the p'ush but- Fig. 4: is a top view of the parts in Fig. 2. Fig. 5 is a bottom viewv Figs. 6, 7, 8, 9 and l0 show' RATION "or NEW secured to the upperpartyotthe 4base-by 'f scr ews 'g'-g, andprojectirig laterally so as wall-socketf f' H'is :ibase-plate, secured the .bottom of. the base by" sciewsj lt L, andfhaving-.anf-

VVithir this metallicsleeve K is .65 a spiral springL, the lower end owhichv- `rests Suponf. the headHof.the.--projectionV I.' f 'The upper endofjthe'sleeveK ise'xternally` 'screw-threaded at .Kl' andfan adjustinglcap 'Y M, internally vscrewthreaded,.. is secured 70 thereon, Sofconstittingfthe adjustable' ortion of; the plunged. The sleeve. K. cai' "ies an insulating bushing N, in whichis 'em-l Y' y bedded a' conducting -ring O. .;The- -insulati `1 ing 'bushing isy heldin'place, by.' ring l? in' one end.

Washer Rf' held4 on `the.''inner"=e 1'1d pf-thevr y sleeve' 'K by upsettingedge f'- the lower 'end of th'eslee'veV This washer.R has one \or f'more 'downward projections l'1H-01,'. 'which span-the bar H'fon the,1ower end' of-lthe cross piece, which acts. asian abutment, hold' 'S5 ing the sleeve K 'nd thep'arts carried there by from rotation when. 1t'. is'forced inward to its extrme limit.. When so'forced'in, the'.

ap M, which :has a slot Mv for a so as to lengthen or shorten 'the push button and secure the proper adjustment in order that the circuitmay be properly completed, that is, so that. the conduct-ingring O of the device shown may comeoppositezthe ends of spring contacts S-'S when the door bolt is thrown. The spring' clips S-S are connected to the binding posts T T .to which the terminals of the circuit to be controlled by the contact are led up through .holes 1.60 u-u'in the base. The posts T-T are held in position by the screws 6 1?.

The device is simple. and safe, and, as

labov stated, is easily capable of adjust men As ordinarily used by me, it is' employed simplyl .to .make the circuit, since whcn'the Contact ring O is moved out of engagement with the s prin .-elips SQS, the v' circuit haslalready been' rokensat'another point. There is, therefore. nosiarkingat -110 75 engagement with a projection,;Q and a 'y What said basev and having engaging screw-- distance between t the conducting ring on its separation from the spring clips of the circuit. j

The upper end of the sleeve K is slotted at Kz and Aslightly expanded so as to make a frictional engagement with the cap M there-I by holdin it in adjusted position.

claim isi, j' 1, In a circuit controller, the combination of a base,"a stationary contactcarried by said base,;u plunger movably mounted in of a. base, contacts carried thereby, a normally extended hollow plungermounted in said base and having an insulated contact moving therewith and adapted to completev a circuit through said contacts when such pluntgler is forced inward, means for varying the stancebetween said insulated contact and the outer end of lsaid plunger, a sta! tionary guide-pin-eXtending into said plunger and carried by said hase, and a spring within said plunger engagin said guidepin and tending to-extend sai plunger'.v

3. In' a circuit controller', the combination of a base, abutment'carried thcreby,a .normally extended plunger body movably mounted thereon and normally free to-re.

` volve,.said plunger having its outer end 2; n a circuit controller the combination @dpted t0 engage said stationarycontgct; 1

screw-threaded, a sereni-threaded end porv tion carried by said plunger body, J a projec- '4'5e tion on the inner en of said plunger body.- 1

adapted to engage' said abutment on said base, only when said lunger is forced inward, circuit termina s and means, carried by said plunger for electricallyv connecting 50,

and disconnecting said terminals'.f -v 4. In a circuit controller, the coinhmatlon of a base, contacts carried thereby, a hollow'A plunger body movably mounted in said base so as to be normally. free .to revolve carryin an insulated. bridgingk -x'nember adap ment for theinner end of said pl eifbody'," an adjustable 'end portion tothe inner end of saidf plunger body having a,

projection adapted to make lateral engage- ,'v

ment with said abutmentonly when said( plunger is forced inward', a guide-pin on, j Y,

into Ysaid-bOdy 5v plunger bearing' V said abutment extendin and a spring within sai against said pin. v

5. In a circuit controller, the combination j y of a. base, stationary contacts carriedv there. 1 1 by, amovable hollowplunger body mounted 7'0 vin said base so as to be normally free tore-' volve andcarrying an insulated `contact an adjustable cap portion secured to fsa body portion by screw threads, an 'abutment for the inner end of said# body ortioiifln. pin secured to said abutment'an p said hollow body. portion, a spring Within y said lbody portion enga adapted-tolaterally engage said abutment" only whensad lun r is forced inwardfv Witnesses:- .I M. H.A GLYNN,


to engage said contacts, abut.. ,11

body of said plunger by screw-threadgfhgigr.

entering i i' said pin' and as: projection secured to said body portion and 1,89'.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3137774 *Jan 11, 1961Jun 16, 1964Douglas DowPlunger switch
US3833899 *May 19, 1972Sep 3, 1974BloscopDevice for actuating an alarm in the case of breaking in
US4996400 *Oct 23, 1989Feb 26, 1991Federal-Mogul CorporationSelf adjusting switch
US5311168 *Sep 10, 1992May 10, 1994Pease Industries, Inc.Lock set with self-contained door alarm and annunciator system
Cooperative ClassificationH01H13/12