US2160301A

US2160301A - Door lock and latch

Info

Publication number: US2160301A
Application number: US102565A
Authority: US
Inventors: Edwall J Baume
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-09-25
Filing date: 1936-09-25
Publication date: 1939-05-30
Anticipated expiration: 1956-05-30

Description

May 30, 1939. E. J. BAUME 2,160,301

DOOR LOCK AND LATCH Filed Sept. 25, I936 I [q 0 I/VVzf/VTOR.

mum 5.0mm .L5/7U/VE. 1 BX Patented May 30, 1939 UNITED STATES PATENT" OFFICE DOOR LOCK AND LATCH Edwall J. Baum, Long Beach, Calif. Application September 25, 1936, Serial No. 102,565

' 6 Claims. (01. 292-16 7) This invention relates to a novel door lock and latch, the prime object of which is to provide a novel means of retracting the bolt by a v minimum amount of rotation of the knob.

Another object is to provide a door lock and latch, including a novel flexible link connecting the lock bolt finger and the knob spindle, said link acting as a camming means as well as a y, link for the purpose of retracting the bolt.

m Still another object is to provide a novel means attachable to the knob spindle which means is pivotally connected to the flexible link whereby the flexible link is actuated to retract the bolt.

J A feature of my invention is to. provide a door lock and latch which is simple in construction, easily installed, and effectivein operation.

Other objects, advantages and features of invention may appear from the accompanying in drawing, the subjoined detailed description, and

the appended claims.

In the drawing: Figure 1 is a side elevation partly in section of my latch and lock in position in a door.

Figure 2 isa top plan View of the same, a fragment of the spindle being shown.

Figure 3 is a side elevation of the lock and latch with parts broken away to show interior construction. l

Figure 4 is a side elevation showing the parts in partial and full retracted position.

Figure 5 is a side elevation of a modified form of latch.

Figure 6 is a side elevation with parts broken 6 away to show interior construction of still another modified form of latch.

Referring more particularly to the drawing, the numeral I indicates a door or the like, in which my lock'and latch are mounted. Two

horizontal bores 2, 3 are provided in the door,

these bores intersecting at right angles, the one bore 2 receiving'the bolt assembly and the bore 3 receiving the spindle, as will be subsequently described.

45 My latch consists of a housing 4, preferably tubular in cross section, which housing extends inwardly from the face plate 5. The face plate is attached to the edge of the door, as shown in Fig. 1, all of which is usual and well known.

50 A rear plate 6 closes the inner end of the housing 4, and this plate is suitably attached to the housing, or, if desired, may be integrally formed therewith.

As shown in Figs. 1 to 3, inclusive, the bolt 55 'I is slidably mounted in the housing 4 and protrudes thru the face plate 5. A pair of

guide arms

8, 8 extends inwardly from the bolt 1 and thru the ,rear wall 6. Each of these arms is provided with a longitudinally extending slot 9, the purpose of which will be further de- 5 scribed.

A coil spring I0 bearsagainst the bolt I and against the'rear plate 6, thereby yieldably pressing the bolt outwardly. A look bolt finger II extends thru the rearwall 6 and is slidable 10 therein. The crosshead I2 or T-head of the lock bolt finger extends into the slots 9 and is slidable in said slots. 'The cross head engages the arms 8 at the outer ends of the slots 9, and thus serves to actuate or retract the bolt 1. Due to the slots 9, the bolt can retract independently of'the finger I I. I

A coil spring 13 serves to yieldably press the finger II inwardly, and also acts to hold .the door knob in proper position, all of which is usual in locks of this character. A lever plate I4 is removably seclured to the knob spindle I5. and the lever plate is preferably provided with a square hole thru which the spindle extends. Thus, it will be evident that the lever plate will rotate with the spindleas the knob is turned by the user.

A link I6 is pivotallyattache'd to the lever plate I4 and encircles the cross .head of the lock bolt finger II. That'is, this link is preferably in the formof .a strap, altho other analogous forms can be used. When the door knob is first'rotated, the link I6 will be tilted, as

shown in solid lines in Fig. 4. This v tilting of' the link causes a camming action to occur between the cross head I 2 of the lock bolt finger and the rear wall '6 of the housing. This serves to retract the lock bolt finger and the bolt. On further rotation of, the knob, the parts assume the posiiton as shown indotted linesin 40 Fig. 4, whereupon thebolt I is retracted to its fullest extent.- This combination'of a'camihing action and a direct pull on the lock bolt finger enables the bolt to be retracted with a minimum rotation of the knob, in either direction. 4

For locking purposes, the lever plate I4 is provided with a plurality of arcuate recesses I1,

one of which is engaged by a locking tumbler I8 mounted in the door. On rotation of the tumbler, a solid portion thereof rotates into the recesses II, thus holding the lever plate against rotation and thereby locking the door.

In Fig. 5, I have shown a. modified form of lever which is pivotally attached to the link I9. This consists of a threaded bolt 20 which screws into the spindle 2|. The action and operation of the latch is the same as previously described. The threaded bolt 20, however, enables the latch to be adjusted in the door so that less care is finger, saidfinger protruding .Ithro'ugh the wall,

necessary in drilling the bore 3 with relation to the outer edge of the door.

In Fig. 6, the arms 8 on the bolt are eliminated, and in this construction the bolt 22 is formed with inwardly extending lugs 23 which are engaged by the head 24 of the lock bolt finger 25. A link 26 is employed, the same as. previously described. A spacewithin thebolt 22 enables the bolt to move relative to the head 24 of the bolt finger.

Springs 21, 28 yieldably press the bolt and the bolt finger inwardly, the same asv previously described.

It will be noted from examination of Fig. 4 that the link I6 has a wide bearing face .which acts against the head I2. important feature of the wide bearing face against the head I2 is that it enables the bolt to be withdrawn with a minimum amount of rotation of the{knob Since the *pull' of the link ifiy'is exerted at the outer edges, as is evidencedfi'n Fig. 4, a slightrotation ofthe knob will causea considerable retraction of v ing through saidwall; said bolt'finger including a-cross-head-on-theinner end "thereof, means" attaching the bolt finger'tothebolt; a' knob spindle, a lever plate non rotatably mounted on the spindle; a link pivotally secured at one end to the lever p1ate','the other endof said link loosely engaging the outer ends of the cross-head whereby tilting of said link on rotation ofthe lever plate will cam the bolt finger inwardly to retract the bolt.

: 2. A door latch comprising a housing adapted to be mounted in a door, a'bolt slidablyniounted in the housing. a bolt finger, meansslidably coupling .the, bolt finger and the bolt, spring means engaging the'bolt" and urgingsaid bolt outwardly,

an in ner wall on the housing, a 'lsecond spring bearing against the wall .and against the belt a knob spindle, a lever non-rotatablymounted on thespindle, a link pivotally attached at oneend tosaid lever, a cross-head on the bolt finger, said link loosely engaging the cross-headwhereby said finger is retracted by'the link onrotation of the spindle, said linkf engaging.said.wall and the cross-head to cam'thefinger inwardly as said lin'ktis tilted.

3. door latchcomprising a housing adapted to be mounted in a. door, a bolt slidably mounted in the housing, a wall closing the inner end of the housing, a bolt finger extending through said wall, means slidably attaching the bolt finger to the bolt, a T-shaped head on the inner end of the bolt finger, a knob spindle, a lever mounted on the spindle, a link pivotally attached at one end to the lever, the other end of said link loosely engaging the T-shaped head of the bolt finger, said link bearing against said wall, whereby tilting of said link in eitherdirection will urge the bolt finger inwardly, and'a' direct pull of said lever further retracting the bolt finger to completely retract the bolt.

4. A door latch comprising a housing adapted tobe mounted in a door, a bolt slidably mounted in thehousing-,-''a bolt finger, means connecting the bolt and bolt finger, a spring in the housing bearing agairist-the- -bolt and urging said bolt outwardly, an inner wall in the housing, said finger protruding through the wall, a knob spindlega lever non rotatably mounted onthe spindle, a link pivotally attached at one end to said-lever, a cross head' on the'ir'm'er end of the bolt finger, said-link'loosely engaging the cross: head adjacent the outer ends of saidhead,"whe'reby said finger is retracted 1 y the link'on rotation of thekno'b'spindle.

5'.'A door latizhfincluding a knob spindle, a housing adapted to ber'nou'nted ina doorfa bolt slidably mounted in the housing, a lever-mounted on "the' spindle, aboltfinger, 'means attaching the finger to the-"bolt," a 'lf shape'd head" on the inner end of thefinger, a linkpivotally attached at one end to the lever, the other end of said link loosely engaging both or the outer ends"of the T-shaped head on the-finger; whereby" a'" wide bea'ring is provided between-the 'headand the link, said linkretracti'ng the "bolt-finger on" rotation of the spindle, said link tilting on rotation of the-spindle;- whereby the bolt finger is moved inwardly a greater distance"'tharrtheinward. directional movement in a parallel plane of the pivot, whichconnects tli'e linka'nd thele'vei'? 6. A door l'atch"including'"'-a knob'spindle, a housing "adapted to be mounted in ames bolt slidably mounted in the hou's'in'gfa spring in the housing engaging the bolt to" project this bolt outwardly; a lever plate mounted o'ri' the spindle; a finger attached to the bolt, a cross-head on the finger extendingputwardly from the center longitudinal axis of the'fi'ngrfia link'loosely en"- gaging both of the'oute'r'nds of thec'i'os's head; a pivot pin connecting the inner end of thelink to"the:1ever"plate, saidj'link' being tilted'by the rotation of thelever plate, "the link bearing against the outer ends'of tlie'cross-head on rota tion of'the lever platejthereby retracting the bolt a greater 'distancea'long' itslongltudinal axis than the travel of the pivot pinofthe lever plate in a parallel plane when the knob 'spi ndle is rotated;