US2308321A - Door lock - Google Patents

Description

Jan. 12, 1%3. H. G. v olcsl-h` DOOR LOCK Filed June 25, 1941 2 Sheets-Sheet l l Il Il Il H lllll IIIIIIIHI Il 12 .ff f f4 y Jan. l2, 41943.

HG. volGH-r DOOR LOCK Filed June 25, 1941 Patented Jan. 12, 1943 UNHTED STATES OFFICE.

'DOOR LOCK Henry G. Voight, New Haven, Conn., assignor to- Sargent & Company, New Haven, Conn., a corporation of Connecticut This application relates to door locks or latches, and more particularly to a mechanism of this kind of tubular or cylindrical form, so that it may be applied to a door through cylindrical bores and thus avoid more tedious and expensive mortising operations.

The mechanism herein described relates par'- ticularly to locks or latches having a bolt casing insertable through the edge of the door, and a mechanism casing insertable into a bore extending through the door from one face to the other in a direction transverse to the opening within which the bolt casing is located. In the past with constructions of this kind some dimculty has been experienced in anchoring the casing for the mechanism in place in an inexpensive manner without the necessity of providing bolts or screws passing into the wood of the door. As disclosed, the casing for the mechanism, as will be hereinafter described, is of cylindrical shape, and is inserted into an opening in the door in which it has a relatively snug fit, so that no other support is needed. There might, however, be a tendency for the casing to rotate in the door, and provision forrestraining it against rotation is effected in the present case by mere surface contact between the mechanism casing and the bolt casing. For this purpose the mechanism casing, while generally of cylindrical shape, is provided with a flattened portion at its Pif forward side, or side nearest the edge of the door, against which flattened portion contacts the rear end of the bolt casing, which latter is secured in place so that the cylindrical mechanism casing is restrained against rotation, It will, of course, :v

be understood that suitable engagement is provided between a bolt stem secured to the bolt and a retractor mounted in the mechanism casing to eiect retraction of the bolt, which parts are adapted to be slidably engaged when the mechanism casing is inserted in place, as will be hereinafter explained in detail.

One object of the present invention is the provision of a door latch of simple and improved form which may be mounted upon a door by inexpensive boring operations,v and without the necessity of mortising operations.

A further object of the invention is the provision of novel means for effecting engagement of the bolt casing and the mechanism casing to restrain the latter against movement when the mechanism is in place. V

A still further object of the invention is the provision of a bolt casing and a mechanism casing insertable in separate openings in a door,

the two casings having complementary contacting surfaces whereby the mechanism casing will be restrained against movement, and at the same time providing a slidable connection between a retractor member within the mechanism casing and the stem within the bolt casing, so that these members will be operatively engaged when the parts are assembled within the door.

'Io these and other ends the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.

In the accompanying drawings:

Fig. l is a sectional view through a door latch structure embodying my invention;

Fig. 2 is a view partly in section on line 2-2 of Fig. 1;

Fig. 3 is a view partly in section on line 3-3 -of Fig. 1;

Fig. 4 is an end view of the mechanism casing with the inside knob and rose removed;

Fig. 5 is a side elevational view of the bolt and bolt casing;

Fig. 6 is a rear view of the parts shown in Fig. 5; l

Fig 7 is a perspective view of the bolt retractor; vand Fig. 8 is a partial perspective view of the outer knob spindle. l

To illustrate a preferred embodiment of my invention, I have shown a portion of a door I il having a cylindrical opening I I provided through the front edge thereof, in which opening is mounted a cylindrical or tubular bolt casing I2 having a' front face I3 adapted to be secured upon the front edge of the door by means of screws I4. p

slidably mounted within the casing II is a latch bolt I5 having a rearwardly projecting stem I6 projecting through a slot I'I in a spring-supporting disk I8, between which and the bolt head I5 is mounted the compression spring I9, which normally holds the bolt in protracted position.

The disk I8 may be secured in place in any suitable manner, such, for example, as providing slots-ZI] in the wall of the casing I2, and providing ears 2l on the disk which enter these slots, the edges of the slots being peened over'or closed in some manner to hold the disk in place. Rearwardly of the disk I8, the wall of the lock case is provided with transversely extending slots or recesses 23, and it will be noted from Fig. 5 that the stem I6 of the latch bolt is provided with anopening 24 which lies within the outline of the slots 23.

The mechanism for retracting Vthe l.bolt is mounted within a cylindrical casing 25, and will now be described. Secured in the end walls of the casing are bearing collars 26 within which are rotatably mounted cylindrical portions 21 of inner and outer spindles 28. The outer spindle passes through the rose 29, which is secured to the case 25 by means of screws 29a passing through spacer members 3I, and the outer knob may be secured upon the end of this spindle by the screw 30a in the usual manner.

The inner spindle 28 likewise is passed through an inside rose 32, and has secured on the extended end the inside knob 33. It will be understood that when the mechanism is inserted into the cylindrical bore 34 extending transversely through the door, the assembly of the casing 25 and spindles 28 is complete together with the outside rose and knob. After the mechanism has been inserted in the bore 34 from the outside of the door, the inner rose is applied and secured to the casing by means of the screws 35 passing into the cover 25a of the casing 25, and these screws will have sufficient length to permit of some variation in the thickness of the door to which the lock may be applied.

Secured upon the ends of both inner and outer spindles are rollbacks 38 having cam portions 39 adapted to rest against the crosshead 40 of a bolt retractor 4I and which serve to move this retractor rearwardly when the knobs are rotated. These rollbacks may be mounted on reduced portions 42 of the spindles, and secured thereon by screws V43, the portions 42 being of non-circular shape so that the rollbacks will rotate with the spindles. It will be noted that the outside rollback 38 is provided with a recess 38ab which is adapted to be engaged by a detent 44 provided on a dogging member 45 slidably mounted in the walls of the casing 25, so as to dog the outer knob against movement when desired, this dog being moved to inoperative position by means of a plate spring 46 bearing against the end thereof and serving to urge it toward the inner knob or to inoperative position.

It will be noted particularly from Figs. 1 and 3 that the casing 25, while generally of cylindrical shape, is provided with a ilattened forwardly disposed portion 43, which portion is adjacent the bore I I so that the rear end of the bolt casing I2, which extends into the cylindrical openr ing 34, will be lodged against the flat face of the casing 25 and hold the latter firmly against rotation, the casing I2 being held in place by the screws I4. It will also be obvious that when the mechanism is inserted in the door as described, and the screws 35 and I4 put into place, the lock structure will be firmly held against movement, as the casing 25 snugly ts the bore 34 and is held against rotation by the contact with the rear end of the casing I2. It may also be noted that the spindles 28 are mounted concentrically with respect to the roses, but eccentrically with respect to the casing 25 and bore 34, this disposition of the parts permitting more room in the casing 25 forwardly of the spindles, and is, of course, not apparent when the lock has been installed, as the opening 34 is covered by the inner and outer roses.

The bolt retractor 4I is shown in Fig. '7 and comprises, in addition to the crosshead 40, already described, a pair of forwardly directed parallel bars 49 and 50 which extend through an opening 48a in the attened portion 48 of the casing 25, and are connected at their front ends by a narrow portion 5I provided with an upstanding finger 52 which is adapted to be engaged in the opening 24 of the stem I6 of the latch bolt. It will be seen, for example, from Fig. 2 of the drawings, that after the bolt assembly has been inserted through the edge of the door and the mechanism casing is thereafter inserted transversely of the door, the projecting end of the retractor 4I will pass transversely through the slots 23 in the end of the bolt casing II, and the finger 52 will be engaged in the slot 24. 'I'his linger is sufiiciently long so that considerable variation in the width of the door is permitted without interfering with its engagement in the opening of the bolt stem.

The retractor is slidably mounted in the casing 25 between the guide plate 54 on the outer wall of the casing and guide members 55 on the cover, so that it will be retracted evenly by the cam portions 39 on the inner and outer rollbacks 38. The crosshead 40 is provided with an opening 56 adapted to receive a post 51 secured at the rear portion of the casing 25, and a spring 58 surrounds this post and bears against the rear end of the casing and the crosshead to normally maintain the retractor in a forward or protracted position. It will, of course, also be normally urged toward this position when the lock is in use by the spring I9, as this spring will act upon the retractor through the engagement of the bolt stem with the finger 52.

As previously stated, the dogging member 45 is slidably mounted in the walls of the casing 25` so that it enjoys a reciprocating movement substantially parallel to the knob spindles, and is urged inwardly or to inoperative position by means of the spring 46.' As shown in Fig. 2, the dogging member is in Operative or dogging position and is moved to this position by an arm 69 engaging the turned end 6I of the dogging member, this arm being mounted upon a slide 62 carrying at its outer end a push button 63. This slide is slidably mounted in the inner spindle 28, and is connected with the arm 69, as shown in my co-pending application, Serial No. 390,317, filed April 25, 1941 and matured into Patent No.

2,268,974, of Jan. 6, 1942, so that further description at this time will be unnecessary. When the dogging member is moved outwardly to operative position, as shown in Fig. 2, it will be retained in this position against the pressure of the plate spring 46 by means of a lug 64 provided on and projecting forwardly from the crosshead 40 so that the lug engages the beveled detent 44. It will be understoodl that this lug will not prevent the dogging member beingV moved outwardly, as the retractor will merely be cammed inwardly to a slight extent to permit the detent 44 to pass. However, after this detent has passed the lug 64 the pressure of the retractor spring 58 and bolt spring I9 will prevent the return movement of the dogging member under pressure of the spring 46. When, however, the bolt is retracted and the lug 64 moved out of engagement with the detent 44, the dogging member will be moved to inoperative position by the spring 46.

To maintain the arm in operative relation to the dogging member, the arm Vis provided with a pin 66 which lies in an opening 6l in thepor tion 6I, which pin enters a slot 68 in the casing 25.

While I have shown and described ya preferred embodiment of my invention, it will be understood that it is not to be limited to all of the details shown, but is capable of modification and variation within the spirit of the invention and within the scope of the appended claims.

What I claim is:

1. A door latch comprising a latch bolt, a latchbolt-operating mechanism therefor, a casing for said bolt, and a casing for said operating mechanism, said casings being insertable into the door through separate openings therein, said mechanism casing being generally of cylindrical shape but having a flattened portion facing the bolt casing, and the rear end of the latter abutting the outer face of said flattened portion to position the mechanism casing when the two are in operative position, and means carried by the bolt and said operating mechanism to be interengaged by a relative sliding movement when said mechanism casing is inserted into the door.

2. A door latch comprising a latch bolt, a latchbolt-operating mechanism therefor, a casing for said bolt, and a casing for said operating mechanism, said casings being insertable into the d'oor through separate openings therein, said mechanism casing being generally of cylindrical shape but having a flattened portion facing the bolt casing, and the rear end of the latter abutting the outer face of said attened portion to position the mechanism casing when the two are in operative position, said operating mechanism including a bolt retractor projecting from the mechanism casing, and said bolt casing being slotted at its rear end to receive the projecting portion of the retractor whereby interengagement of said retractor and bolt may be effected by relative sliding movement when the mechanism casing is inserted into the door.

3. A door latch comprising a latch bolt, a latchbolt-operating mechanism therefor, a casing for said bolt, and a casing for said operating mechanism, said casings being insertable into the door through separate openings therein, said mechanism casing being generally of cylindrical shape v HENRY G. VOIGHT.

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