US2042021A - Doorlock - Google Patents

Description

` May 26, 1936. w. R. scHLAGE DooRLocK Filed oct. 22, 1934 INV TOR.

www v ATTORNE S.

Patented May 26, 1936 UNITED STATES DOORLOCK Walter R. Schlage, San Francisco, Calif., assigner to Schlage Lock Co., San Francisco, Calif., a corporation of California Application October 22, 1934, Serial No. '149,388

Claims.

'Ihis invention relates to door loch of the deadlocking type and especially to improvements on the type of lock shown in my Patent Number 1,846,364, entitled Door latch, issued February The object of the present invention is to generally improve and simplify the construction and operation of door latches of the character described; to reduce the number of -parts previously required; to provide a spring whereby a break over or snap action is obtained when the latch bolt is projected or retracted and whereby the crank or roll-back pin actuating the latch bolt is denitely located at the end of each stroke; and further, to provide a spring whereby the crank or roll-back pin is held in engagement with one or another of a pair of dead-locking cams, both in retracted and extended position of the latch bolt, thereby preventing accidental release of the dead-lock either by shock, vibration or otherwise.

The door latch is shown by way of illustration in the accompanying drawing, in which:-

Fig. l is a central vertical longitudinal section of the door latch taken on line I-I of Fig. 3, said view showing the latch bolt in projected position.

Fig. 2 is a section similar to Fig. l but showing the latch bolt in retracted position.

Fig. 3 is a plan view of the door latch showing the latch bolt housing and the door in section.

Fig. 4 is an end view, said view being partially in section.

Fig. 5 is a perspective view of the latch bolt.

bar.

Fig. 'I is a perspective view of the anchor plate. Fig. 8 is a perspective view of the latch bolt housing.

Fig. 9 is a perspective view of the crank or roll-back arm.

Fig. 10 is a cross section of the crank or rollback arm taken on line X-X of Fig. 9.

Referring to the drawing in detail, and particularly Fig.q3, A indicates in general a latch bolt actuating unit and B a latch bolt unit. These units are assembled in the door by drilling or boring two holes therein; one hole transversely through the door as indicated at C to receive 50 the dead bolt actuating unit and a second hole such as indicated at D, which is drilled through the edge of the door to receive the dead bolt unit.

The dead bolt actuating unit comprises a pair 55 of escutcheon plates engageable with opposite Fig. 6 is a perspective view of the latch bolt.

faces of the door as indicated at 2 and 3 respectively. The plate 2 carries a handle or turn piece l, and also carries a flat spindle bar 5. The plate 3 carries a cylinder lock 6 actuated by a key 1 and also carries a pair of posts 8-8, the ends 5 of which are drilled and tapped to receive a pair of screws 9 9 whereby the plates 2 and 3 and the mechanism carried thereby is secured in the door.

The latch or dead-bolt unit consists of a cy- 10 lindrical-shaped housing generally indicated at I0, the forward end of which is open wlile the inner end is closed by an end section I I. Formed in the end section are two rectangular-shaped openings I2 and I3. IThe forward open end of l5 the housing is secured as shown in Figs. 1, 2, and 3 to a guide plate I4 and this plate has a square opening formed therein through which the latch or dead-bolt I5 extends. This bolt is slotted at its inner end as clearly shown in Fig. 5, and this slot forms a seat or recess to receive the outer end of a latch bar I 6, the latch bar being secured in the slot or recess formed in the inner end of the bolt by a pin or rivet I1 extending therethrough.

The latch bar is U or channel-shaped in cross section and it forms a receptacle and a retainer for a spring generally indicated at I8, the function of which will hereinafter be described; the spring being held against endwise removal vfrom the bolt I5 and the latch bar by having its inner end bent at right angles as shown at I9 and by passing said rectangular bend between the pin or rivet I1 and the end wall of the slot.

The latch bar is rigidly secured to the bolt. Its free or inner end is notched as shown at and a pair of dead-locking cams 2 I and 22 are formed on opposite sides of the notch. The function of the notch and shoulders will hereinafter be described.

'Ihe latch bar extends through the rectangular opening I3 formed in the end of the housing I0. The opening I2 also formed in the end of the housing I0 serves to receive the shank I2a of an anchor plate 23, see Fig. '7. The shank after being passed through the opening I2, is riveted or flattened so that the anchor plate will be rigidly secured to the housing. The anchor plate has a central opening formed therein as indicated at 24 and has openings formed at opposite ends as indicated at 25 and 26, these openings being provided so that the posts 8 and 9 can extend therethrough; hence, by providing these posts, it is not only possible to secure the escutcheon plates 2 and 3 with relation to the face of the door but it is also possible to secure the anchor plate and the housing Il), to which it is secured, against endwise removal from the opening D.

The central opening 24 formed in the anchor plate serves as a bearing for a crank or roll-back arm, which is best shown in Figs. 9 and 10. This arm is made of a single piece of metal folded upon itself, said metal forming a pair of hub members Illa and a pair of arms IIJb through which extends a crank or roll-back pin Inc. A portion of the metal forming the hub sections IIIa of the roll-back arms is bent inwardly, as

clearlyshown in Fig. 10, and as such forms prongs, such as shown at 21, which retain the roll-back members or arms against removal with relation to the anchor plate and furthermore function as a pin or sleeve extending through the opening 24. 'I'he prongs are slightly separated, as shown, and spaces are thus formed between them, as indicated at 28, to permit the spindlebar 5 to pass therethrough and also permits the formation of a driving connection between the spindle bar and the crank or roll-back arms.

To install the lock in a door, it is only necessary to drill the two openings, indicated at C and D, and then to insert the latch bolt unit B. Thereafter, the escutcheon plate 3 having the posts 8 8 mounted thereon is inserted and as it is placed in position, the posts will pass through the openings 25 and 26 of the anchor plate and thus anchor it against endwise removal, and then by Vapplying the escutcheon plate 2 and insertingthe screws 9 8, the work of installation is complete.

After installation, it is possible to project or .retract the latch bolt I5 either by the key 'I or the turn piece 4. When the turn piece is grasped and rotated, the spindle bar 5 will rotate with the same and as a driving connection is formed between the'spindle bar and the crank or rollback arms Illa, these arms together with the rollback pin I0c carried thereby will swing in one direction or the other. The bolt may thus be pro- ,iected or retracted as the case may be. Similarly, by inserting the key 1, the plug in the cylinder lock is rotated. A driving connection is formed between the plug and the spindle bar 5 and it is thus possible to rotate the spindle bar either by the key or the turn piece, and when the spindle bar is rotated, motion will be transmitted through the roll-back arms and pin to either retract or project the latch-bolt. The driving connection between the plug and spindle bar is of the type disclosed in detail in my co-pending application Serial Number '745.941, entitled Lock, filed September 26th, 1934. This connection provides a lost motion between the plug and spindle bar and permits operation of the spindle bar by the turnpiece 4 when the plug is locked.

-The spring arm I8 rests on top of the rollback pin and thus holds it depressed in either of the positions shown in Figs. 1 and 2. That is,

a. pair of recesses are formed in the upper edge of the anchor plate, as indicated at 30 and 3|. In Fig. 1 the roll-back pin is shown as engaging Vthe recess 38, and in Fig. 2 the roll-back pin is engaging the lrecess 3|. The spring thus iirst of all functions to hold the roll-back pin in eitherA of these positions. This action is important as` either by center; this being true whether it is key actuated It Is also important as it first of all produces a 10 smooth, definite action when rotation is imparted either by the key or the turn piece; furthermore, the snap action is transmitted through the roll-back arms to the spindle bar and the mechanism actuating the same so that when a person 15 is projecting or retracting the latch, he or she can definitely feel when the bolt is fully projected or retracted.

The important feature is, of course, that of dead-locking the bolt in extended position. This 20 is denitely accomplished in the present instance by providing the recess 3|I and the spring arm I8 for the simple reason that when the roll-back pin isV held in engagement with the recess 30, any amount of endwise pressure exertedy on the'bolt 25 I5 when it is extended will be of no avail as the dead-locking cam 2| formed on the latch bar will engage the upper face or side of the pin and will thus exert an angular downward pressure on the pin, forcing it against the recess 38 and 30 thereby positively dead-locking the bolt.

As a matter of fact, this same action is obtained when the bolt assumes a retracted position. That, of course, is not so important-but it does have some importance when it is consid,- 35- ,ployed are of substantial form. The number of 45 .springs employed have been reduced to a single spring and as this is nothing more or less than a single long armed spring, danger of crystallization and breakage is eliminated, also any danger of the spring being dislocated or falling loose is entirelyavoided as it is completely housed and retained in the channel-shaped latch arm I I. Hence, a fool-proof smooth acting lock has been provided in which accidental movement of the parts is avoided and in which any part becoming -55 broken and getting out of order has been reduced to a While certain features of the present invention are more or less specifically described, I wish it understood that various changes may be resorted "w to within the `scope of the appended claims. Similarly, that the materials and finish of the several parts employed may be such as the manu'- facturer may decide, or varying conditions or uses may demand. 'B5

Having thus described my invention, what I claim and desire to secure by Letters Patent is:-

1. In a door latch of the character described a latch bolt, a latch bar secured thereto, a housing in which the latch bolt and bar are slidably m mounted, an anchor plate secured to the inner end of the housing at a point below the latch bar and in alignment therewith,a roll-back member pivoted on the anchor plate, a notch formed in the lower side of the latch bar andadjacent the '75 inner end thereof, a roll-back pin carried by the roll-back member and extending into the notch oi the latch bar to project or retract the latch bar and bolt when movement is imparted to the roll-back member, and a spring arm carried by the latch bar and bearing against the roll-back pin to produce a snap-over action when the latch bolt and bar are projected or retracted.

2. In a door latch of the character described a latch bolt, a latch bar secured thereto, a housing inwhichthe latch bolt and bar are slidably mounted, an anchor plate secured to the inner end of the housing at a point below the latch bar and in alignment therewith, a roll-back member pivoted on the anchor plate, a notch formed in the lower side of the latch bar and adjacent the inner end thereof, a roll-back pin carried by the roll-back member and extending into the notch of the latch bar to project or retract the latch' bar and bolt when movement is imparted to the roll-back member, a dead-locking cam formed on each side of the notch with which the roll-back pin is engageable at the end of the retracting or projecting movement oi' the latch bolt, and a spring arm carried by the latch bar and bearing against the roll-back pin to produce a snap-over action when the latch bolt and bar are projected or retracted and to retain the roll-back pin in engagement with one or the other of the deadlocking cams.

3. In a door latch o! the character described a latch bolt, a latch bar secured thereto, a housing in which the latch bolt and bar are slidably mounted, an anchor plate secured to the inner end of the housing at a point below the latch bar and in alignment therewith, a roll-back member pivoted on the anchor plate, a notch formed in the lower side of the latch bar and adjacent the inner end thereof, a roll-back pin carried by the roll-back member and extending into the notch of the latch bar to project or retract the latch bar and bolt when movement is imparted to the roll-back member, a dead-locking cam formed on each side of the notch with which the rollback pin is engageable at the end of the retracting or projecting movement of the latch bolt, a 5 spring arm carried by the latch bar and bearing against the roll-back pin to produce a snap-over action when the latch bolt and bar are projected or retracted and to retain the roll-back pin in engagement with one or the other of the deadlocking cams, and a recess formed at each end of the anchor plate, one of said recesses receiving the roll-back pin when the latch bar and bolt is projected and the other recess receiving the rollback pin when the latch bolt and bar are retracted.

4. In a door latch 'of the character described an anchor plate having a central opening formed therein, a roll-back member comprising a pair of connected arms straddling the anchor plate and each arm having a hub member and a central opening, said hub member being bent into the central opening of the anchor plate and forming a pivotal connection betweenthe arms and the anchor plate.

5. In a door latch of the character described a latch bolt, said bolt being vertically slotted at its inner end, a latch bar havim one end insertable in the slotted end of the latch bolt, a pin extending crosswise through the slotted end of the bolt and the latch bar to secure the latch bar against removal, said latch bar being channel-shaped in cross section and positioned with the open portion at the bottom, and an elongated spring arm secured at its outer end by the pin which extends through the slotted end of the latch bolt and the latch bar, the free end of the spring extending toward the inner end of the latch bar and lying within and guided by the sides of the channel shaped latch bar.

WALTER R. SCHLAGE.

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