US1829814A - Door latch - Google Patents

Description

` Nov. 3, '1931.2 w. R. scHvLAGE DOOR LATCH 2 Sheets-Sheer Filed April 18, 1928 INVENTOR.

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NOV. 3, 1931. w, R lscgl-{LAGE y 1,829,814

DOOR LATCH Filed Aprirl, 192e 2 sheets-sheet 2 INVENTo/. .9

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Patented Nov. 3, 1931 UNITED .STATES PATENT OFFICE R. SHLAGE, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO SCHLAGE LOCK COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION 0F CALIFORNIA Doon. 'Laren Application led April 18, 1928. Serial N0. 270,815. l

This invention relates to a door latch, suchv as used in French doors, screen doors, etc., and it also relates to a door latch which may be used as a night latch and the like.

The object olf the present invention is to generally improve and simplify the construction and operation of door latches; to provide a door latch which may be installed in a door with a minimum of skill. andl eiort; to provide a door latch which may be installed in a comparatively thin door, such as a screen door, a French door, etc.; to prov-ide a door latch which is adjustable to take care of doors of varying thickness; to provide a door latch which permits centralization of the bolt -or latch with relation to the edge of the door; to provide a door latch which is reversible to take care of rightand left-hand doors; to provide a door latch whichconsists of two separable units, to-wit, a bolt or latch unit and a latch actuating unit; to provide a door latch structure whichfprmits a rigid interlock between the two units. when assembled in a door; to provide an interlock which is simple in construction .and which insures proper alignment and co-action between the working parts; and further to provide a door latch whichmay be key or knob actuated or both, as conditions may demand.

The door latch is shown by Way of illustration in the accompanyingdrawings, in which:

Figure 1 is a perspective view of thelatchl unit,

Figure 2 is a actuating unit,

perspective View of the latch Figure 3 1s 'a central vertical longitudinal l section of the door `latch taken on line III-III, Figure 7, a

Figure 4 is a horizontal sectional view of a door showing a modiiied form of the door latch, Figure 5 is a perspective view oi' the rol1. back crank, 2

Figure 6'is a perspective viewof the anchor plate,

Figure 7 is a horizontal section of a door showing the latch unit and the latch actuating unit assembled and interlocked in the.

door,

Fi ure 8 is a' perspective view of thev 10 is a perspective view of the cam plate-'are secured to the cam plate,

Figure 12 is a longitudinal section of the inner end of a key-actuated tumbler lock showing the cam plate, the driver plate and the spindle secured to the cylinder plug,

Figure y13 is an end view of the key-actuated tumbler lock.

lReferring to the drawings in detail and particularly Figures 1, 2, 3 and 7 A indicates in general the latch actuatin unitfB thev latch unit and C the vdoor in w ich the units yare assembled. The latch unit consistsof a latch face plate 2 which may be secured to the edge of the door in the usual manner as by means of screws, such as shown at 3. Se-

cured to the rear side of the latch plate is a latch housing 4. The housing illustrated in the present instance is cylindrical in crosssection and vit forms a guide for the bolt'or latch 5, a latch bar 6 secured thereto, and a spring 7 whereby the latch is normally projected. yThe rear end 'of the latch housing is closed by an end section 8 and this end section is reinforced andstrengthen'ed by an end plate 9. Extending through the end sec-v tion 8 and the plate 9 1s an anchor plate 10.'

This plate is best illustrated in Figure 6.

The inner end of the anchor plate is provided. 'with a shank 11 which extends through the plates 8 and 9 and it is riveted or otherwise secured thereto. The inner end of the latch bar 6 also extends through the plates 8 anK 9 and pivotally attached to the latch bar as at 11 is a rollback crank generally indicated I at 12, this crank being best illustrated in Figures 1, `3 and 5. The rollback crank consists of two web members, as shown, which are tied together at the bottom by a cross piecev 13. The lower ends of the webs are slotted, as shown at 14, to receive a spindle bar 15, as will hereinafter Abe described. The upper ends of the webs are perforated to receive the pivot pin 11 and the inner end of the latch d bar isvertically slotted to take care of the arcular movement of the rollback crank. The Aseveral members of the' vlatch unit, to-wit, the plate 2, the housing 4;, the anchor yplate 10, the rollback crankl12v and the latch bar 6 are allvpermanently attached and connected, as

shown in Figure 1, and whenso assembled and connected,.it canbe readilyand qulckly assembled `in a door. An ordinary door, by the way, in order to be prepared for the reception of the latch unit and the latch actuating unit need only have two,` holes bored therein, one holesuch as indicated at l) which passes transversely* through the door and 'a second hole,'such as indicatedat E, lwhich is disposed at right angles thereto, i-t being drilled or bored through the edge of the door. After the holes are drilled the latch unit is irst inserted in the hole E and is there secured by means of the screws 3 The latch ac- V-tuating unit is then inserted from oppositesides of the hole 'D and when secured, as will Hereinafter be described, completes the installation and assembly of themechanism.

The latch actuating unit may be key or.

. knob actuated, i. e., the spindle bar 15 may be l' rotated either by an ordinary keymechamsm or by knobs or handles-such as indicated at 16 in Figures 4 and 7. In the presentv instance both forms are illustrated. By referring to Figures 2v and 7'it willbe noted thata pin tumbler type-of key actuatedflock' is illus-l 19 which may be rotated when the proper key is inserted, ,such as shown at 20a inFigure 7. The cam `plate in this instance is best illustrated' in .Figures2 and 10V and it cooperates with a driver "plate 20` (see Figure'9) to rotate the spindle bar15 (see Figures 2' and 8).

The assembly of the cam plate, the driver plate and-the spindle is best showrf in Figure l2, i. e., the cam plate is secured by vmeans of screws 21 and lugs 22 to the inner end of the cylinder plug. The driver plate 2O is po- V'to sitioned exteriorof thecam plate and` it is provided with anl annular iange 22a'which terminates lil'rapair of opposed shoulders 23 v and 24. The inner end of the spindle bar -15 passes through a slot 25 inthe driver plate and asthis slot `h as the same cross-sectional vshape as the spindle bar, ali-interlock to .preventrotation is formed. The cam platelf), on Vthe other hand, is provided with a round central opening 26 through which'theinner l"end of the spindle bar passes so that the cam plate may be turned independently thereof. The mner face of the cam plate is also recessed, as shown at 27, to receive a washer 28.

i The inner end of the spindle bar is riveted to 65 this washer, as shown at 29 l(see Figure recopie .l

andthe driver ate is thus secured to the cam plate, but the cam plate is free to rotate a plate, i. e., the c am indicated at 19a. which is `carried by the cam plate` can rotate'feely between the shoulders23 and 24l and it does not transmit movement to the driver plate until one or the other of the shoulders is engaged.

The normal position ofthe lug 19a is centrally between the shoulders 23 and 24. This is impor ant as it permits the knob or handle 16 to rotate the spindle 15 without interfering with the cam plate or the key-acuated mech- :given vdistance Without rotating thc driver anisln. On the other hand, when the key is i inserted, the cam plate is rotated until lug 19a engages one of the shoulders and the driver plate together with the. spindle is then rotated thereby. By reerring to Figure 7 it will be noted' that the spindle'bar 15 projects'into 'the knob4 or handle 16, i. e., it lits a recta-ngu lar-shaped slot formed therein and it is accordignly'possi'ble to,rotate the spindle either by th'e knob or the key-actuated cam plate and` the driver plate cooperatingtherewith, and it is also possible to rotate the spindle bar by meansof the knob or handle 16 without inte'rfering with the cam plate. It makes no diierence whether the spindle bar is rotated byA the lkey mechanism orv by the, knob or handle 16. In eitherinstance rotation of-the spindle causes the rollback to swing in the direction of arrow a (see Figure 3). This causesretraction of the retractor bar and the latch 5 and compression of the spring 7 thus permitting vopening of the door. '0n the other hand, when either the key or the knob is released, the spring will extend and the parts will move back to normal position.

ent invention is the method and mechanism vemployed for interlocking the latch unit and the latch actuating unit.

One of the important features of the pres By referring to igure 2`it will be noted that the `cylinder'barrel 17 is provided with two posts, such as shown at30and 31. The

outer ends of these' postsV are drilled and tapped, as indicated at 32 and they serve the function of receiving the securing screws indicated at 33 (seeEigure 7). The anchor plate is perforated,as at 30a, to receive the post 30 and it is notched, as shown at 31a, to receive the post 31. In other words, when installing and assembling the latch mechanism, the latch unit -B is first inserted endwise through the opening E, the unit, shown in Figure 2, is then4 inserted through the opening `l) and ywhen so inserted' the lspindle bar 15 passes through the slots 14 of the rollback crank while the postsk 30 and 31 pass through the respective openings 30a and 31a in the anchor plate, the escutcheon plate, indicated at 35'is applied to the opposite face of the door, and the screws 33 are inserted and secured. ',This completes the assembly and 130 installation of the latch mechanism. .It is,

of course, understood that the knob 16 has a tion required between the it forms a rigid interlock units; third, it provides an adjustment whichA rectangular hollow opening formed therein, asv indicated by dotted lines at 37, and that this' opening receives the free end of the spindleA bar as previously described.

The interlock formed by the'posts30 and 31 and the anchor plate is exceedingly important. First of all it is simple; secondly, between the two lock formed insures perfect alignment and lco-action of the working parts.

The mechanism as a whole is exceeding-ly simple and as such will not require skilled mechanics when installing and assembling the same. While Figures l, 2 3 and 7 illustrate a key-actuated mechanism on one side of the door and a knob mechanism on thel other, it is obvious that knobs may be employed on both sides, for instance asv shown in Figure 4. The spindle may be square or, 'iat in cross-section, as desired.. The spindle shown at 40 is square in cross-section and the opening in the lower end of the rollback crank would then be the same. The spindle would be vsecured to the handle 16 while the opposite handle 16a would merely be provided for the recess such as shown at 41 for its reception.

` The handle 16 and the spindle 40 would be permanently attached to the outer escutcheon while the handle 16a only would be permanently secured to the inner escutcheon plate; otherwise the mechanism would be identical to that illustrated in Figures 1, 2 and 3, i. e., the same or identical latch unit B would be employed and the outery escutcheon plate would carry the screw posts 30 and 31, while the inner escutcheon plate would carry the' securing screws Another important feature to be noted is the fact that thefkey-actuated unit to which the posts 30 and 31 are secured may be 1n serted through the anchor plate from either side of the door. This fact renders the latch unit, as a whole, reversible and as such permits installation in rightand left-hand doors. as the case may be. y

While certai features of the present ini vention are more or less specifically described, 'I wish 1t understood that various changes may be resorted to lwithin the scope of the appended claims; similarly, lthat the materials and finishes of the several parts elnployed may besuch as the manufacturer may a .latch bar connected with the decide .or varying conditions or uses may demand.

pI-Iaving thus described my invention, what Iclalm and desire to secure by Letters Patent 1s 1. In a door latch of the character described, a latch unit and a latch actuating' end of the latch housing,

3.- In a device of the character described, i

a latch housing, a latch projecting through the outer end thereof, an anchor plate`secured to the inner end of the latch housing,

a latch. bar connected 'with the latch and projecting through the inner end of the latch housing, a rollback crank pivotally attached to the inner end of the latch bar, said rollback crank beingperforated, to receive a spindle bar and said anchor plate being perforated to receive interlocking members, a latch actuating unit disposed at right angles tothe latch unit and the anchor plate, a spindle bar on the latch actuating unit, and a pair of posts on the latch actuating unit, said spindle bar extending through the rollback crank and the posts through the anchor plate when the two units are assembled in a door.

4. In a device of the character described, a latch housing, a latch projecting through the outer end thereof, an anchor plate secured to the inner end of the latch housing,

latch and projecting through the inner end of the latch housing, a rollback crank pivotally attached to the inner'end of the latch bar, said rollback crank being perforated to receive interlocking members, a latch-actuating unit disposed at right angles to the the anchor plate, a spindle bar on the latch actuating unit, a pair of posts on the latchv bar.

5. In a device of the character described, a cylinder barrel, a cylinder plug, key-actuated means for imparting rotary motion to the cylinder plug, a cam plate secured to thel cylinder plug, a driver plate secured to the cam plate and partially rotatable independlatch unit and ently ofrthe. cam plate, the cylindery plug K' and the cam member on the cam' plate an engageable with the. driver plate to rotate the same, a spindle bar secured to the driver 5 plate, and a pair. of posts secured to the c lindenbarrel and parallel rwith the spin le bar. n ,y i 6. In 'a device. of the'character described,

s -a` spindle bar, escutcheon plates at opposlte 4m ends thereof forming a support for the `spinj dle bar, means connected with opposite ends of thespindle bar for rotating the same, -a pair of posts connected withone escutcheon \plate,' said posts being threaded at thelr op- -45 .posite ends, screws extending through the v f opposite escutcleon plate and engaging thel .threaded ends of the posts yto securethe'esl cutcheon plates to opposite facesof a door, a |latch unit extending through the'edge of the door at right angles to the spindle bar, means actuated by rotation of the vspindle bar for v retracting the latch in the latch unit, and an anchor plate on the inner end of thelatch unit and interlocking with the posts. f 25 7. In Ya device of the character described, a

' spindle bar, escutcheon'plates at opposite ends 'thereof forming asupport forthe spindle bar, means connected with oppositeA ends of the spindle bar for' rotating'the same, 'a -pair I 30 of posts connected with one escutcheon plate,

sa1d posts being threaded at their opposite ends, screws extending through the opposite escutcheon plate and engaging the threaded l ends ofthe posts' to secure the escutcheon plates to opposite faces of a. door, a latch unit extending through the edgeof the door at right angles to the'spindle bar, a latch the latch\unit, a latch bar connected with the latch at onel end and with the rollback mem- 'y 4" -ber at the other end, means actuated by rota` tion of the spindle bar for rotating the rollback to retract the latch, and anchor'means on the inner end of. thelatch unit through which theposts extend topform an interlock between the latch actuating unit and the latch unit. 8. In a device of the character described a latch hous1ng,`a latch projecting through .the 6' outer end thereof, an anchor plate on the inner end of the housing, said plate having a` plurality of perforations formed therein,`a

spmdle projecting through the anchor plate, a connectionbetween the spindle Aand `latch n 55 whereby'the latch is reciprocatedduring rotation ofthe spindle, and an interlocking member extending through the anchor plate. y 9. In a device of the character described, an escutcheon'plate, acylinder barrel mount- 30 l ed in saidplate, a cylinder plug in said bar-V rel, key actuated means for imparting rotary movement to the cylinder plug, a pair of lugs formed one on each'side of the cylinder'ba11'- rel, anda' post member secured to each lug.

Yes 4 l WALTLE RR. Salime-IJ.V

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