US2368840A - Door latch and lock - Google Patents

Description

A. R. JONES Feb. 6, 1945.

' DOOR LATCH AND LOCK Filed April 24, 1944 :lu/vauro@ www,

ff f6 ,f j en? Patented Feb. 6, 1945 UNITED sizfriszsfasistirv OFFICE DOOR. LATCH AND LOCK Alfred Reginald Jones, BurlingtonQOntario,

Canada Application April 24, 1944, Serial N0.- 532,516

I Claims. '(CL 70-153) This invention relates to improvements in 'door latches and locks and consists essentially of a round combined spring `latch and bolt slidingly operable within the door, novel means mounted on the opposite facesofl the door for retracting the latch bolt against the urge of -the spring in response to manipulation of the door knob and means for locking the latch bolt against retraction by the use of the door knob.

Door latch and lock mechanism is commonly encased as a unit, with door knobs and spindle separable from the unit, the latter being either applied to one face of the door, or mortised into the door from the edge, and commonly includes a protractable and retractable bevelled spring latch bolt retractingly responsive to manipulation of the door knob and also a. protractable and retractable locking bolt operating subject to the turn of a key.A yThe unit when placed on the face of the door is unsightly but very easily applied by drilling a roundhole for the spindle. To obviate the unsightliness of this external type of unit it has become conventional practice to mortise theunit into the door, but mortising the unit consumes a great amount of time and painstaking labor. To overcome the skilled labor involved in mortising a unit various attempts have been made to provide satisfactory locks embodying cylinders in which the latching and locking mechanism is contained, the `cylinders being applied by drilling round holes into the door from the edge.V` These types vof locks however failed owing to the impracticability of compacting complicated mechanism within a necessarily small and round compass, and have been too expensive toV produce on a commercial scale. latter types of lock required the` drilling of two holes in from the edge of the door, `one for the latching bolt and one for the locking ybolt since it has been found limpracticable to .produce a combined latching and locking bolt of this character. Furthermore, the drilling of two holes required factory precision in order to get them` exactly parallel both with the faces of the door and to each other. y

The principal object of the invention, therefore, isto provide a combined door latch and lock, the mechanism of which Will `be concealed but nevertheless applied mainly to the faces of the door in order to obviate the customary mortising. I

A second important object is to provide a combined door latch and lock, the mechanism of which'4 .is concealed` but nevertheless applicable Moreover, the use of these to the door by merely drilling a plurality of round holes having a high degree of tolerance in the precision of positionand parallelism.

A third important object is to provide a device of the -kind described wherein the knob actuated retraction mechanism and the key actuated locking'mechanism liemainly in la compact flat position between the faces-of thedoor and a conventional form of shallowly recessed liescutcheons.

A fourthimportant object is tovprovide a device of the class described which will be simple, durable, efficient, easy to apply, and inexpensive to produce and to purchase. f

With the above vand other objects in view as will be hereinafter apparent, the invention consists in general of certain-novel details` of 'construction and combinations of'parts hereinafter fully described, illustrated in the accompanying drawing and specifically claimed. l

In the accompanying drawing like characters of reference indcatelike parts in the several Views, and: Y

Figure 1 is a face View of a portion of aldoor showing in vconnection therewith a-'door latch and lock as constructed in accordance with the present invention but with the escutcheon and door knob removed;

Figure 2 is a bottom sectional elevation taken on the line 2--2 of Figure 1l. p

Figure 3 is a top sectionalelevation taken of the line 3-3of Figure 1, y

Figure yl is a reduced perspective view `includ-v ing the escutcheon which is partiallybroken to yshow the locking tumbler in certainarm locking position. l I

Figure 5 `is similarly a perspective view of the region of the door before application ofthe lock showing the round holes which are drilled for such application.

In the drawing a portion of a door is indicated by the numeral I0. In preparation of the door for the reception or application of the improved latching and locking device, round holes II, I2 and I3 aredrilled through the door from r 2 iy i trally aligned with the holes II, I2 and I3 in the ldoor but smaller in diameter t'o allow for tolerance of any inaccuracy occurring in properly spacing and directing the door holes.

A common door knob Will be seen in Figure 4 indicated by the numeral I6. The door knob spindle I1, to which both knobs are removably fastened in the conventional or any suitable manner pass through conforming cores in bushings I8 which turn subject to the spindle I1 on'` manipulation of the knob I6. These bushings are journalled in the holes in the plates I which .open to the hole I2 in the door and are provided with outside retention flanges I9, and inside thelplatesy are conventionally provided with Wire retention clips 2i) disposed in conforming annular grooves., Formed with each flange I9 is a crank 20 carrying a crank pin 2l.' Pivoted to each crank pin 2.11 is a slotted drag-link 22 having slottedconnection also with a reciprocal levelling arm 23 byv means. of a pin 24 which extends through the door hole I-I and through the corresponding holes in the plates I5. The. arms 23 which are pivoted to the plates at 25 at ay different-level than the links extend upwardly and terminate well beyond thepin when a certain locking device is to be used with the. latch. Otherwise the arms may terminate lower at the pin. v

In the hole I4 is arranged a sleeve 26 in which slides a round and bevelled latch bolt 21,. The sleeve isfprovided with a; face plate 28l which is preferably countersunk into the recess 29V in the edge of the door, and is held in position byscrewing vthe faceplate tothe door; .The sleeve 26 has a rear internal ange 39 anda helical spring 3| Within the sleeve bears against the internal flange 38 andthe boltV 21 urging the bolt to its projected position as shown in all the views. Concentrically extending froml the base-on'` thebolt` 2,1; into the door hole I I is a draw-bary 32 and through `this draw-bar the pin 24 passes.

As previously set forth, the bolt 21 is retained in normal'projected position by means of the spring' 3i, that is to say, in latched position. In that position, the bolt is engaged withthe complement-al keeper in the door jamb, which may be of any conventional or common type and hence. is not shown. To withdraw the bolt from the keeper the door knobv is turnedy in the common manner, thus turning thez spindle I1 and with the spindle the crank 20. They movement of the cranks 2li transmitted to the bolt 21 through the slotted drag-links 22, draw bar 32 and pin 24, retracts' the bolt against the compression of they spring 3l. On releasing the door knob, the bolt 21 will obviously return to its protracted position under the urge of the springBI, when at the same time themeohanism will revertl to its normal position by reverse action common to spring latches-- Ihe levelling arm 23 keeps the drawbar 32 in level position during the reciprocal movement of the bolt 21 thus keeping the latter from binding in the sleeve 26 which might otherwiseoccur, by the lift of the crank. In closing the door it Will be well understood that the bolt 21 will' snap into position in the keeper Without the useY of the knob as is common in spring protrac-ted bevelled bolts. In thus closing .the door without the use of the knob the retraction of the bolt 21 will cause the l pin to move back in the slots 33 in the drag-links 22'. Thus the bolt on impinging the keeper Will retract against the compression of the spring 3I and protract into the keeper Without disturbing they door knob. the-bushingsIrthecranks ZBAfor-thelinks v22. .y

, by the arm 23' when the spindle'I1 ordinarily operates to retract the bolt 21.

Journalled in holes in the plate I5 in registry 'with the `hole I3 are opposed bushingsv 3d and formed with these bushings are flat tumblers 35. Ihese bushings may 4:be held in place similarly to the bushings Iil by wire clips 38. Through-the bushings and through the tumblers is a key hole 31. By the manipulation of a key it can be v seen that these tumblers can be thrown from one side to the other, that is to say, into locked position and into unlocked position., In unlocked position one tumbler is shown in Figure l and in locked position the opposite tumbler is shown in Figure 4. Each tumbler has an oiset obstructor 38 and when the tumbler is turned to locked position the obstructor 3B falls in the path taken Thus the retraction of the bolt 21 is prevented. In turning v. the tumbler 38 to this locked position it will be seen that a projection 39 engages the top of the arms 23 therefore actingI as a stop for the tumbler in Vits arm locking position, whereupon the operator is aware that the tumbler is fully turned. Similarly a stop d limits the movement of the tumbler in its unlocked position by contact With the projection 4I thereon.

After the lock has been installed on the door and before the knobs are mounted, shallowly recessed escutcheons i2A are fitted to. the door and enclose and excludefrom sight all external mechanism. After thev eseutcheons. have been fitted they knobs it may be mounted and set in the usual manner.

The lock here shown istted for a door opening toward the operator from the left.v For a door operating toward the operator lfrom the right the unit on one face of the door is simply reversed with that on the other.

The pin illy is preferably provided with a pei'- manent head on one end and a removable head 24a on the opposite end for easy assembly. The removable head may be constructed by providing it with a-socketwliich is slidingly separable from the shank portion of the pin. Theremovable head is kept from accidently coming ofi the lshank of the pin by the closely lying escutcheon.

Moreover, in the event of an attempt on the lock b-y'an unauthorized person in removing one escutcheonV and face plate I5 andv then trying to extract the pin 24', only the detachable Vhead 24a would respond. The pin itself is prevented from being pushed out the opposite side by the- 1. In combination with a door, a spring protractable'latch bolt holed into the door from the edge thereof and having a rearwardlyv extending draw-bar, a bolt retraction pin extending from one face of the door into a transverse holein the' door and 'connected tothe draw-bar, a door knob. spindle extending through a. second transverse hole inthe doorand associated wtha crank'. lying adjacentto a Vface of the,l .doorV a. drag-link con-.-

. A .i l' n necting the crank and the pin, and a levelling arm for the bolt, said arm being fulcrumed at another level than the bolt and pivotally associated with said link.

2. A latch bolt retraction unit consisting of a plate applicable to the face of a door and having round-openings registerable with round transverse holes in a door to which the plate is applicable, a door knob spindle bushing revolvable in lone of the plate openings and having a nonround core for the reception of a door knob spindle, a crank on said bushing, a slotted draglink pivotally connected to the crank, and means associated with the slotted portion of the draglink and arranged to extend through one of the openings and into one of the holes of a door from outside the face of the door there to connect with means associated with a latch bolt, and a leveller arm pivotally connected to one portion of the plate and pivotally associated with the slotted portion of the drag-link.

3. In a latch bolt retraction unit comprising a first assembly consisting of a plate applicable to one face of a door and having round openings registerable with round transverse holes in a door to which the plate is applicable, a door knob spindle bushing revolvable in one of theplate openings and having a non-round core for the reception of a door knob spindle, a crank on said bushing, a slotted drag-link pivotally connected to the crank, and a leveller arm pivotally connected to one portion of the plate and pivotally associated with the slotted portion of the draglink, a similar second assembly applicable to the opposite face of a door, a pin loosely connected with the slotted portions of the drag-links and arranged to extend from one drag-link to the other through one of the openings in the door and to intermediately connect with means associated with a latch bolt.

4. In combination with a door, a spring protractable latch bolt holed into the door from the edge thereof and having a, rearwardly extending draw-bar, a bolt retraction pin extending from a face of the door into a transverse hole in the door and connected to the draw-bar, a door knob spindle extending through a second transverse hole in the door and associated with a crank lying adjacent to the face of the door, a slotted drag-link connecting the crank and the pin, a levelling arm for the bolt, said arm being `fulcrumed at another level than the bolt and Divotally associated with the slotted portion of said link and adapted to lie in a normal position while the bolt is normally protracted and to move to a second position with the link When the 'bolt is retracted in response to manipulation of the door knob and to also move to its second position independently of the link and along the slot therein When the bolt retracts automatically on impingement with a keeper, and a tumbler arranged to lie in one position out of the path of the arm and to be thrown to a second position into the path of said arm to intercept movement of the arm and consequently the bolt from normal position.

5. In combination with a door, a spring protractablelatch bolt holed into the door from the vedge thereof and having a rearwardly extend# ing draw-bane. bolt retraction pinextending vfrom a face of the door into a transverse hole in the door and connected to the draw-bar, a doorl knob spindle extending through a second transverse hole in the door and associated with a crank lying adjacent to the face of the door, a slotted drag-link connecting the crank and the pin, a levelling arm for the bolt, said arm being fulcrumed at another level than the bolt and piv otally associated with the slotted `portion of said link and adapted to lie in a normal position While the bolt is normally protracted and to move to a second position with the link when the bolt is retracted in response to manipulation of the door knob and to also move to its second position independently of the link and along the slot therein when the bolt retracts automatically on impingement with a keeper, a tumbler arranged to lie in one position out of the path of the arm and to be thrown to a second position into the path of said arm to intercept movement of the arm and consequently the bolt from normal position, and said tumbler and said arm lying on a common vertical plane. f

ALFRED REGINALD JONES.

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