US1876081A - Door latch - Google Patents

Description

Sept. 6 1932 w. R. SCHLAGE 1,876,081

DOOR LATCH Filed March 5, 1929 2 Sheets-Sheet l L. Lflmlln l L A' 36/ L38 f 3 34 33 BZ Sept. 6, 1932.

W. R. SCHLAGE DOOR LATCH Filed March 5, 1929 2 Sheets-Sheet 2 IN VEN TOR.

A TTORNE YS.

Patented Sept. 6, 1932 UNITED STATES PATENT ori-ICE WALTER n. scnLAGE, or SAN raANcIsco, cALIronNIA, Assrenon ro scnLAcE Loox coMrANY, or` sAN rnmcrsco, CALIFORNIA, A conronATIoN-.or CALIFORNIA Application filedv March 5,

This invention relates to a door latch, andespecially to a dead locking mechanism therefor.

The object of the present invention is to generally improve and simplify the construction and operation of dead locking attachments for door latches; to provide a dead locking mechanism which is particularly adapted for, door latches in which two separable units are employed, one the latch actu- 'ating unit containing the spindle and retractor mechanism, and the other the latch unit containing the latch and its associated mechanism; to provide a dead locking mechanism which is designed for installation in the latch unit; and further to provide a dead locking mechanism which is adapted to dog or lock the latch in its extended position when an auxiliary bolt is depressed, and which is also adapted to be released. and retracted by means of the retractor and the mechanism actuated thereby.

The invention is shown by way of illustration in the accompanying drawings in which:

Fig. 1 is a. central vertical longitudinal section taken through the latch unit and the latch actuating unit,

Fig. 2 is a vertical longitudinal section of the latch unit taken on line 2, 2 of Fig. 3,

Fig. 3 is a plan section taken on line 3, 3

Fig. 1,

ig. 4 is a section similar to Fig. l but showing the'auxiliary bolt depressed,

Fig. 5 is a perspective view of the latch, the dead bolt and the latch retracting link,

Fig. 6 is a perspective view of one of the latch dogging members,

Fig. 7 is a perspective view of the retractor link,

Fig. 8 is a perspective view of the latch bar,

Fig. 9 is a. perspective view of the latch,

Fig. 10 is anotherperspective view of one of the latch dogging members,

Fig. 11 is a perspective view of the auX- iliary bolt,

Fig. 12 is a perspective view of the latch 'unit housing,

Fig. 13 is a perspective view of a reinforc- 1929. serial m. 344,260.

with the housing A, support a spindle 4, a retractor guide 5, and a retractor 6. Thev in'- ner end of the spindle is shaped as shown at 7 (see Fig. l) and it engages a pairof plates indicated at 8. Hence, when'v rotary motion is transmitted to the spindle 4 by meanspof the knob indicated at 4a, the member 7 on the inner end of the spindle will rotate and thereby depress one oranother of the plates 8 and as these plates are carried by and secured to the retractor 6, the retractorwill move inwardly in the direction of Aarrow a. Conversely, when the handle or knob 4 is released', a spring 9 will force the retractor outwardly.

-A second spindle is shown at 10 (see Fig. 3).

This spindle terminates in an inner end such as indicated at 7a, this end being similar to the spindle end indicated at 7 The spindle l0 is in this instance actuated by key mechanism, generally indicated at 11, and when a f shown in Fig. 1. In other words, the retractor may be retracted either by the spindle 4 and its actuating knob 4a, or by means of the spindle 10 and its actuating mechanism 11.

' Retractive movement of the retractor is transmitted to withdraw the latch indicated at 12, and when this is retracted the door may be opened. 'Y f The knob'4ais mounted on the'inside of the door, and the key actuated mechanism on the outside,vhencethe: door is opened from the inside when the knob4a` is rotated, `as such rotation is transmitted to retract, the latch 12 and it is similarly retracted from-the outside by means of the key actuated mechanism 11.

The purpose of the present invention is to provide a dead locking mechanism which will render the door jimmy-proof. That is, burglars invariably employ a jimmy which is mserted between the door and the frame, and by means of the jimmy are able to force the latch 12 inwardly, thus opening the door without the use-of. a ke Of course if the burglar is equipped wit a key that will fit the lock, such operation is not necessary, but it is not often t of the proper key, and in that instance he always resorts to a jimmy operation. J imm ing of the door is, in this instance, prevente by the dead locking mechanism forming the subject matter of this application. This mechanism is constructed and operated as follows:

The latch 12 is reciprocally mounted within the housing B. The latch is attached to a latch bar or plate generally indicated at 13 (see Fig. 8) that is, the inner end of the latch 12 is slotted as shown at 13a and the forward end of the latch bar 13 is inserted in the slot 13a. A rivet or screw is then passed through the holes indicated at 14 and 14a, and

the latch and plate 13 are thus secured as an integral unit. The latch bar 12 is provided with two shoulders, generally indicated at 15. These shoulders engage a face plate 16, which is secured to the edge of the door by the use of screws 17 in the usual manner. Engagement of the shoulders 15 with the plate 16 serves the function of limiting the outward movement of the latch 12.

By referring to Fig. Sit will be noted that the latch bar, is provided with a second set of shoulders, indicated at 18. These shoulders are engaged by the dead locking mechanism to prevent retraction of the latch 12, as will hereinafter be described.

Slidably mounted on the inner reduced end 19 of the latch bar is a retractor link generally indicated at 2O (see Figs.` 5 and 7). The outer end of the link terminates in a head 21, which is provided with inclined shoulders 22. The main 'portion of the link is slotted, as indicated at 23 and the inner end is provided with a head member 24, which is slidable on the reduced end 19 of the latch bar. The head 24 is otherwise provided with notches 25 in its upper and lower surfaces, and these notches are engaged by the fingers 6a of the retractor. A pin 26 (see Figs. 3 and 8) secured on the latch bar extends through the slot 23 of the retractor link and a sliding connection is thus formed between the latch bar and the link. This sliding connection is important as it permits several functions, the first and main function of the retractor link being that of forming a connection between the retractor 6 and the latch bar, whereby the latch bar andlatch 12 are retracted when the retractor 6 is retracted. That is, inward movement of the retractor 6 in the direction of arrow a see Fig. 1, causes the finger 6a of the retractor at a burglar is in possessionA which engages the notches 25 of the retractor link, to pull the retractor link inwardly. The pin 18 of the retractor bar is at that time engaged by the outer end of the slot 23 formed 1n the link, and an inward pull isv thus exerted which causes retraction of the bar 13 and the latch 12, in this manner permitting opening of the door either by means of the knob 4a or the key actuating mechanism 1-1.

The other functions produced by the sliding connection which is formed between the retractor link and the latch bar 13 will hereinafter be described.

Projecting through theJ face plate 16, and parta ly guided by said plate and b the housing B is an auxiliary bolt 3 0. T is is` best shown in Fig. 11. It consists of a halfround elongated bar, on the inner end of which is formed a flat extended plate 31and a semi circular plate 32 the plate 32 merely acting as a gulde member as it engages the inner surface of the housing B. The flat plate 31 engages one half of the latch bar 13 and is guided thereby. The plate 31 is provided with two inclined shoulders, such as indicated at 33, the function of which will hereinafter be described.

Mounted in the inner end of the latch housing B is a reinforcing plate 34. This is best illustrated in Figs. 3 and 13. Two rods, shown at 35 and 36 extend through perforations formed in the reinforcing p ate 34 and the inner end of the latch housing and are there riveted and secured. The outer end of the rod 35 extends into a guideway 37 formed in, the latch 12, while the outer end of the rod 36 extends into a guideway 38 formed in the auxiliary bolt 30. Springs 39 surround the rods and are interposed between the latch and the auxiliary bolt respectively, and these springs function to normally maintain the latch and the auxiliary bolt in the extended position shown in Fig. 3. These `springs also have another function which will hereinafter be described.

Before proceeding further it mightbe advisable to state that the reinforcing plate 34 does not only function as a reinforcing plate, but it also functions as one of a pair of in# terlocking members formed between the housin s A and B. That is, the latch housing B see Fig. 12) is punched first to form f openings 40, and secondly to form guide and 46, the arms being disposed at right an.

gles to each other to form a bell crank shape. The arms 46 have recesses 47 formed therein, to straddle the rods 35 and 36, thus permitting the springs 39 to rest on the inner ends of the arms 46 as clearly shown in Fig. 2. This is the second function of the springs 39,

' their first function being that of normally projecting the latch 12 of the auxiliary bolt 13, and the second function being that of engaging the inner ends of the arms 46 of the locking dogs.

The locking arms 45 of the .dogs are, however, normally held out of locking or clogging osition by means of the head or plate 31 ormed on the inner end of the auxiliary bolt 30, as clearly shown in Fig. 2. However, when the auxiliary bolt is moved inwardly, as shown in Fig. 4, the locking ends or arms 45 of the dogs will ride down the inclined shoulders 33 of the plate 31, and they will then assume the position shown in Fig. 4 at a point rearwardly of the shoulders 18 formed on the latch bar. When the dogs assume this position latch 12 is dogged or locked against inward movement and the application of a jimmy or like tool will be of no avail, as the latch 12 is deadlocked.

The latch may, however, be retracted at any time, whether deadlocked or not, either by means of the knob 4a or by the key actuated mechanism 11. l

The retractor link 20 has another function besides that of retracting the latch 12, to wit, i

that of first releasing the dogs and secondly retracting the latch.

By referring to Fig. 4 and Fig. 7 it will be noted that the inner end of the retractor link is provided with inclined shoulders 22 which are disposed on an angle opposite to the shoulders 33 forming a part of the auxiliary bolt. Hence, if the retractor is retracted either by means of the knob or the key actuated mechanism, link 2O will move inwardly with the retractor 6. The inclined shoulders 22 will then engage the outer ends of the dogs or arms 45 and raise them sufficiently to clear the shoulders 18, hence permitting retraction of the latch 12 even though the auxiliary boltassumes its deadlocking position. In other words, slot 23 in the retractor link 20 is sufficiently long to permit sutlicient inward movement of the link 20 to raise the locking dogs to clear the shoulders 18 before pin 26 is engaged, and the latch bar 13 and latch l2 are retracted.

The retractor link performs still another function, to wit that of permitting free inward movement of the latch 12 if the door is slammed. That is, a door is Often swung closed and when that is the case, the inclined face of the latch engages the striker plate of the door frame and is thus forced inwardly. lVhen this happens the latch bar 13 moves inwardly with the latch, pin 26 slides freely in the slot 23 and the reduced inner end 19 of the latch bar slides freely through the head 24 of the retractor link. The retractor link thus permits three different operations or fnnctions-rst that of retracting the latch 12, secondly it permits free inward movement of the latch and the latch bar, and third the retractor link functions as a means for releasing the dogs 45 when the latch is to be retracted.

The auxiliary bolt and the dogs actuated thereby, as constructed in the present insta-nce, are reliable and dependable in operation, and may be readily installed in a small elongated latch housingl such as here illustrated.

While the auxiliary bolt and dogging mechanism actuated thereby are hereshown as installed in a specific form of two unit latch, it is obvious that it may be installed in practically any form of latch mechanism employing a separable latch unit and latch 'actuating unit. I further wish it understood that the specific form of the retractor link is also capable of installation in various forms of latch mechanism of this character, and that the only change required is a slight alteration in the shape of the head 24.

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

1. In a latch bolt mechanism of the character described a latch, an auxiliary bolt, a retractor, a sliding member connecting the retractor and the latch, means whereby depression of the auxiliary bolt will dog the latch, and means whereby movement of the retractor and the sliding member will rst release the dogging means and secondly retract the latch bolt.

2. In a latch bolt mechanism of the character described, a latch, an auxiliary bolt and a retractor, a retractor link connecting the retractor and the latch, a sliding connection between the two, a dog, means whereby depression of the auxiliary bolt Will move the dog into engagement with the latch and secure it against inward movement', and means whereby movement of the retractor and the retractor link will first release the dog and secondly retract the latch bolt.

3. In a latch bolt mechanism of the character described a latch, a latch bar having a shoulder formed thereon, an auxiliary bolt, a retractor, a dog, means whereby depression of the auxiliary bolt'will move the dog into engagement with the shoulder on the latch bar and secure the latch against inward movement, a sliding link forming a connection between the retractor and the latch bar, and a head member on the link engageable with the dog to release it with relation to the latch bar, said link also adapted to retract the latch bar and latch bolt.

4. In a latch bolt mechanism of the character described, a latch, an auxiliary bolt, a latch bar secured to the latch, said latch bar having a shoulder formed thereon, a retractor, a dog, a head member on the auxiliary bolt normall ing it out ofy engagement with the shoulder on the latch bar, said shoulder havingv an in# clined surface which, when the auxiliary bolt is depressed, permits engagement of the dog with the shoulder on the latch bar, thereby securing the latch bar and the latch against inward movement, a head member actuated by the retractor and operable during retracting movement of the retractor to engage the dog and release it with relation to the shoulder on the latch bar, and other means forming a connection between the retractor and the latch bar whereby the latch bar and the latch bolt are retracted during inward movement of the retractor after the dog has been released.

5. In a door latch bolt of the character described a latch bolt, an auxiliary bolt, a retractor, a sliding link forming a connection between the retractor and the latch bolt, a (logging member and means actuated by the auxiliary bolt for moving the clogging memlge into or out of engagement with the latch 6. In a door latch bolt of the character described a latch bolt, an auxiliary bolt, a retractor, a sliding link forming a connection between the retractor and the latch bolt, a dogging member, means actuated by the auxiliary bolt for moving the dog 'ng member into or out of engagement with tie latch bolt, and means actuated by sliding movement of the link with relation to the latch bolt for moving the (logging member into or out of engagement with the latch bolt. l

WALTER R. SCHLAGE.

engaging the dog and retainl

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