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Publication numberUS1448554 A
Publication typeGrant
Publication dateMar 13, 1923
Filing dateOct 11, 1921
Priority dateOct 11, 1921
Publication numberUS 1448554 A, US 1448554A, US-A-1448554, US1448554 A, US1448554A
InventorsLudemann Robert W
Original AssigneeLudemann Robert W
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Door latch
US 1448554 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Mw., 13, 1923. y

R. W. LUDEMANN DOOR LATCH Filed Oct. ll, 1921 2 Sheets-sheet 1 ar. 1s, 1923. 1,4%,554 l R. W. LUDEMANN DOOR LATCH .Filed oct.. 11, 1921 sheets-sheet 2 Patented Main. i3, 1923.

narran stares maaar ROBERT w. LUDEMANN, or BUFFALO, MINNESOTA.


Application led October 11, 1921. Serial No. 507,086.

To all whom. t may concern:

Be it known that ROBERT W. LUDEMANN,

a citizen of the United States, residing atv necessary to prevent its unauthorized operation from the outside.

It is a further objectvof this invention to provide a locking device for the latch which may be operated either from the inside or outside through the medium of a key in the possession of an authorized person.

It is a further object vof the invention to provide a latch which is of .sturdy construction and which may be easily applied to any type of door, and which is simple in' construction and which may be manufactured at low cost. y

Referring to the accompanying drawings forming a part of this specification,-

Figure 1 is a front perspective view of' a door with my latch applied thereto;

Figure 2 is a rear or inside view of the latch applied;

Figure 3 is a vertical sectional view on the line 3-*3 of Figure 2;

Figure 4 is a view similar to Figure 8, but

illustrating the locking device forthe latch Figure 5 is a front elevation of the latch applied to the outside ofthe door and vshowing the key for operating the locking device;

Figure 6 is a vertical sectional view on the line 66 of Figure 4, showing the latch locking device; and

Figure 7 is a perspective view of the key.

Referring now more specifically to the accompanying drawings by numerals of reference which indicate like parts throughout the several figures, a barn or other door is designated by the numeral 2, this door being hinged to swing in the usual manner on vertical hinges, not shown, and cooperating with a door frame 4 of' ordinary construction, except, as hereinafter designated as being modified for the specific purposes of' its which may be locked on the inside when` adaptation to the present form of latch.

The door is provided upon'the inside and outside adjacent `its end-with diametrically Opposite face plates 6 and 8, beingA suitably secured as by screws 9.

Journaled in a transverse opening through the face plates 6 and 8 and through the door, is a latch spindle l0 having its ends extend ing beyond the face plates upon opposite sides of said door, 'the outer end having fixed thereon an outside' stop-bar ll which'may be swung during the movements of th-e spindle l0, through a portion of an arc of a circle as shown in Figure l. This bar 'll normal abuts the vertical member of the door frame 4 and limits the inwardV movement of the door.

Secured to the outer threaded end of the spindle, through the medium of a nut'l4 is an operating loop handle 1G, so formed that it may easily be grasped by the hand.l

For the y purpose of securing the `door against outward movement on its hinges, l provide upon the inner end of the spindle 80 thereto and which cooperates, when swung on the spindle to the position shown in full.

l0, an inside latch bar i8, fiiredly secured lines in Figure 2, with a latch plate 19 secured tothe interior of the door frame. An inside operating arm or lever 2O rigidly secured to the lower'portion of said latch bar 18 is for the purpose of swinging the same eithery to latching position shown in fullY lines or to released position as shown in d0- ted lines in said Figure 2. It is ofy course understood, that the stop bar ll is never moved to a position wherein it will be free of said door frame 4 when the dooris closed, and said bar 11 being rigid with lthe spindle upon which is alsoy fixed the inside latch bar 18, it follows that it is limited in its upper swinging movement by the abutment of the' lever 20 against the pull handle 40.

For the purpose of preventing unauthorized releasing of the latch from the outside of thevdoor, I provide a locking member 22 which is journaled in a transverse opening through said door and face plates, on the inner end of a stud 24, and to which it is rigidly secured, the outer end being provided with a rib 25 which cooperates with a slot 26 in the end of a key 28, which may be inserted in the keyhole 30 from the outside to swing the locking member into a position, such that its toe 32 may be moved into a recess on the side of the said inside latch bar, and thereby prevent the latte-r being rev i leased.

Turning ofthe key in the roper direction removes thelocking mem er `from they recess 34 vso that the latch maybel sWungto dotted line position in 'Figure 4.

It is of courseunder'stood that the latch may be released from the inside by merely the following claims:

raising the member "22 With the hand,'Where upon the latch l8inay be operated by; thel arm or lever 2O.,v

Itfivill thus be observed that thedoorl'atch,y may be operatedl from .either4 the inside or outside by ya person having the proper key'.

A1 pull handle y4Ozis secured to the inside of the d'oor'so that the door` may be smiling.; from the inside.y

.It is also understood that various-changes may be madein my'invention Withoutdeparting from the spirit thereof as'defined by l.y The combination'with a` door andv a fra-me therefor, (a spindle journaled in ksaid door,- a stop member-carried by. said spindle on` the outside of,v said door, a latch member carried by said spindle on the inside of the door and means for oscilla-ting said spindle to" swing saidlatch fmember on the. axis Y thereof andmcans for lockingysaid spindle against movement v v y2. Thecombiriation withra doorand frame therefor having la ylatch plate, a spindle jour# naled'for oscillating movement in said door,

" -ri a'stop barl carried by said spindleon the outside ,of saiddoon and adapted for engagement with said frame? to limit'thefinward movement of said door,"a vlatch bar seeufred' yto said spindle on the insidek ofnsaid door and cooperating lWith said vlatch plate `on said frame;y means.: for oscillating saidspindle l, carried by the outer end, of said, spindle,

means lcarriedloy saidlatch bar for oscillating the latter from the'inside of the 'door and '-m'eans for lockingsaidl `latch barwhen moved into latching yposition with ,respect Y to said latch plate. n

, In alatch for securing a door toa door.

frame",-y a spindle, a stop bai' 'secured'onone end tl'iereof,V a latch xed tothe other end thereof and provided with :recessin the sidetherjeof7 alocking-member-pivoted 'adj'ay cent said latch bar, and means for swinging vsaid locking member on its' pivot` toV bring the toe thereof Within saidv recess ',1 whereby said latch" bar is locked against pivotal movement. y v y 4. Thev combinationwitli a` door and frame thereof having alatch plate, a spindle ourlnaledinsaid door, a stop bar rigidlyinounted onsaid spindleyexterior of said door, a

handle also rigidly mounted on said spindle exterior of saidv door, a latch bar` yrigidlyv mounted on4 the inner `end of saidfspindle on the` .inside ofsaid door' andadapted for movement into and out of yengagement with.'v

i said latch plate on the frame,l said latch bar having la recess in the side thereof, a latch locking member pivotally mounted on. the insideofk said door adjacent said latch bar and having a portion for engaging .in said recess7 key operated meansonsaidlatch locking member whereby it may beosciliated i by akeyto engage or'disengage it with said recess, and manually operatedmeans for? oscillatingvsaid latch bar from the inside or outside ofsaid door.. v The combination with a door and a frame therefor, a spindle journaled in said door, a stop. member carried by said spindle on' theoutsideof the door, a latch member carried by said spindleion the inside of the i' -bar' secured to said spindle 'on the inside of said door and cooperating with said latch plate on said fra-me,` a handle secured tosad yspindle on the outside of said door: andan operating lever secured to said latchlbar on the inside ofthe door, whereby said stop bar and latch bar may be operated simultaneously, from either theinside or outside of the door.: i V

In testimony whereof I my signature.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4796445 *Dec 15, 1986Jan 10, 1989Norden Jr Howard PDoor locking mechanism
DE921283C *Oct 2, 1948Dec 13, 1954Adolf Dr-Ing KochBauelement, insbesondere aus Stahlbeton, oder Bauhilfselement aus anderem Werkstoff mit biege-, scher- und torsionsfester Stossverbindung
U.S. Classification70/135, 292/202
International ClassificationE05C3/00, E05C3/04
Cooperative ClassificationE05C3/041
European ClassificationE05C3/04B