US1733442A

US1733442A - Door latch and lock

Info

Publication number: US1733442A
Application number: US263311A
Authority: US
Inventors: Bert E Bartholomew
Original assignee: CONS HARDWARE MANUFACTURERS IN
Current assignee: CONS HARDWARE MANUFACTURERS IN; CONSOLIDATED HARDWARE MANUFACTURERS Inc
Priority date: 1928-03-21
Filing date: 1928-03-21
Publication date: 1929-10-29
Anticipated expiration: 1946-10-29

Description

Oct. 29, 1929. B. E. BARTHOLOMEW ndoR LATCH AND LOCK Filed March 21, 1928 3 Sheets-Sheet l Oct. 29, 1929. a E BARTHOLOMEW. 1,733,442

DOOR LATCH AND LO Filed March 21, 1928 3 Sheets-Sheet 2 1 III Oct. 29, 1929. B. E. BARTHOLOMEW 1,733,442

DOOR LATCH AND LOCK Filed larch 21, 1928 3 Sheets-Sheet 3 Patented a. 29, 1929.

UNITED STATES PATENT orrica BERT E. BARTHOLOMEW, 0F PASADENA, CALIFORNIA, ASSIGNOR TO CONSOLIDATED HARDWARE MANUFACTURERS, INCORPORATED, OF PASADENA, CALIFORNIA, A

CORPORATION OF CALIFORNIA noon LATCH AND LOCK This invention relates to locks and latches, I

and-has for an object, the provision of a combined lock and latch wherein duplication of mechanisms is not required as has heretotom been the case to produce a lock and latch. Another object is the provision'of a latch wherein the latch bolt is adjustable in respect to its effective length, so that accurate spacing of, the mechanism from the edge of lo the door is not essential, and so that the length of the latch bolt may be varied should any displacement take place between the door and the associated jamb.

Another object is the provision of a combined latch and lock of-whic'h the latch bolt guide is a separate unit, permitting the same latch to be adaptable for use on either right or left-hand doors.

Another object is the provision of a combined latch and lock, the mechanism of which is' adaptable to all of the various types of operating means such as turnable knobs and thumb-actuated levers. As-a result, a single,

type of latch and lock mechanism may be em- 93 ployed to fill all the requirements for door latches and locks, whereas it has heretofore been necessary to employ one type of mechanism for outside doors, another'type for doorsbetween rooms, another for French doors,

$3 and in fact a difierent type of mechanism for practically every type of door.

A further object is the provsion of an improved door latch and lock of a relatively few component parts, which is simple of construction and operation, inexpensive to manufacture, which is easy to install, and efficient in operation.

With the foregoing and other objects in view which will be made manifest in the following detailed description and specifically pointed out in the appended claims, reference is had to the accompanying drawings'for an illustrative embodiment of the invention, wherein:

Figure l is a side elevation of a portion of a' door to which my improved combined latch and lock has been applied. The turn able shaft is shown in section, as is a portion of the door to better reveal the construction adapted to be used with the 2f the improved latch bolt and guide there- Fig. 2 is a vertical, sectional view taken transversely of the door substantially upon the line 22 of Fig. 1, the direction of View being indicated by the arrows.

Fig. 3 is a side elevation of a portion of the door with the escutcheon plateremoved to reveal the operating mechanism of the latch and lock, the direction of view being indicated by the arrow?) of Fig. 2.

Fig. 4 is a horizontal, sectional view, the plane of section being taken upon the line 44 of Fig. 3, and the direction of view indicated by the arrows.

Fig. 5 is a perspective viewof the housing within which the operating parts of the latch and lock are mounted.

Fig. 6 is a perspective view of the spider housing of Fig. 5 to vary its effective length.

Fig. 7 is a fragmentary, sectional view of the locking mechanism, theplane of section being taken upon the line 7-7 of Fig. 2, and the direction of view indicated by the arrows.

Fig. 8 is a perspective view of the saddle Which is one of the parts of the operating mechanism of the latch and lock.

Fig. 9 is a perspective View of one of the operating cams.

b Fig. 10 is a perspectiveyiew of the lock F ig. 11 is a perspective view of a portion of a,French door showing one type of my improved bolt guide mounted thereupon.

Fig. 12 is a perspective view of the strike plate intended for use with the bolt guide of Fig. 11.

Fig. 13 is a vertical, sectional view taken transversely of a portion of the door and showing amodified form of the invention wherein the same operating mechanism is employed in conjunction with a different type of operating and locking means.

In terms of broad inclusion, my invention comprises a combined latch and lock wherein a common bolt may be optionally employed as a simple latch bolt, or may be locked in extended position-to serve the purpose of a lock bolt, thus doing away with the necessity of employing independent mechanisms to serve each purpose.

Thelatch bolt is constructed to permit adjustment in respect to its efiective length.

. Therhousing within which the operating mechanism of the latch is mounted, is' also adjustable in respect to its effective length, making the latch and lock adaptable for use with doors of different thicknesses. To permit using a common operating mechanism on all types of doors whether right or left-handed, the bolt guide is formed as a separate unit,permitting the bolt guide to be invertlarger cylindrical portion 7 by connectingwalls 9. Preferably a pair of horizontal guide rods 11 are rigidly mounted within the housing 6 to extend transversely across the cylindrical portion 7.

The housing 6 is intended to be rigidlymounted within an aperture 12 extending transversely through a door 13 adjacent the edge 14 thereof, remote from the hinges. In

order to make the housing 6 adaptable for use with doors of difierent thicknesses, I provide a spider 16, one of which may be mounted upon each end-of the housing 6. The spider 16 comprises a body portion 17 in the form of a short cylinder havinga flange 18 extending inwards from one end thereof. The outside diameter of the cylindrical portion 17 corresponds to the inside diameter of the cylindrical ortion 7 of the housing 6, permitting the msertion of the spider 1.6 within the ends of the housing 6. 1

A plurality of legs -19 project from the cylindrical portion 17 these legs being rigidly secured to the outer surface thereof;

' and a plurality of recesses21 are provided about each edge of "the cylindrical portion 7 to accommodate the legs 19 when the spider 16 is inserted therein. As a result, the hous- I ing 6 may be used in a door of greater thickness than the length of the housing, the length being measured parallel to the axis of the cylindrical portion 7. v The legs 19 of the spider 16, will engage the inner faces of the escutcheon plates and hold. the housing 6 rigid therebet'weem With this purpose in mznd, I have provided each of the legs 19 of the spider, with a plurality of scores 20 so that the legs may length. The aperture 22 through the flange 18.is placed centrally thereof, so that it is positioned concentrically within the'.cylinbe broken off atselected drical portion 7 of the housing 6 when the spider 16 is employed. a

The operative mechanism of my improved combined latch and lock includes a saddle 26 which is substantially sector-shaped with the arcuate edge 27 of the sector corresponding to the inside circumference of the cylindrical portion 7 of the housing 6, and with the apex of the sector cut off as at 28 in a plane perpendicular to a radius bi-secting the sector. A groove 29 extends radially toward the arcuate edge 27; and a pair of holes 31 parallel to the groove 29 provide means for mounting the saddle 26 for sliding movement upon the guides 11 within the cylindrical portion 7 of the housing 6. A second groove 33 extends from the edge 28 of the saddle, midway between the sides 34 thereof, it being understood that the groove ,33 is disposed at right angles to the groove 29. A lug 36 extends laterally from each side 34 of the saddle 26 adjacent each of the bounding radial surfaces 37 thereof. That side 38 of each of the lugs 36 remote from the associated radial surface 37, is rounded as clearly shown in Fig. 3.

v tapped hole 41 extends from the arcuate surface 27 through the saddle 26 into the groove 29; and the shank 42 of the latch bolt 43 isthreaded at its inner end 44 to be received within the hole 41. It is thus readily understood that the eifective length of the latch bolt 43 may be varied .bychanging the distance to which the shank 42 is threaded into the hole 41.

The shank 42 extends loosely through an aperture 46 in the cylindrical portion 7 of the housing 6; and inadvertent turning of the latch bolt 43 is prevented by positioning a latch bolt guide 47 within the edge 14 of the door 13. The guide 47 is a separate unit, being entirely disconnected from the other portions of the latch. It is rigidly mounted within the door 13 by being positioned within a counterbore 48 within the hole 49 extending from the aperture 12 to the edge 14 of the door, and in which the shank 42 is reciprocable. A dowel 50 maybe inserted withln a groove in one side of the guard plate 47 to hold it against rotation within the counterbore 48. A coil spring 51 is compressed be-' tween the housing 6 and latch bolt 43 to normally retain the latch bolt in extended position.

' The means for retracting the latch bolt 43,

,comprise a shaft 56 extending through the of the saddle horizontally, past the shaft 56.

sector-shaped cam 58 is rigidly mounted as the case may be,

on the shaft 56 closely adjacent and on each side of the saddle 26, each of these cams being positioned between the lugs 36 on one side 34 of the saddle 26. It may thus be un' derstood that when the shaft 56 is turned, the cams 58 will engage the upper or lower lugs 36 and slide the saddle 26 upon the guides 11 transversely of the housing 6 to Withdraw the latch bolt 43 against the action of the coil spring 51; Since the sides 38 of the lugs 36 adapted to be engaged by the radial edges 59 of the cams 58 are rounded, a rolling movement of the cam 58 over the lugs 36 is gained, rather than a sliding-movement as would be the case if the lugs 36 were formed otherwise.

Any type of operating-means may be employed ventional type of knobs 61 is to be employed, the opposite ends of the shaft 56 may be threaded for their reception in the usual I manner. However, in Fig. 13 a modification is shown wherein the same type of operative mechanism is employed in conjunction with one of the knobs 61 on one side of the door 62, and a thumbactuated lever 63 on the other side of the door. This embodiment is intended primarily for use on outside doors. When the mechanism is to beemployed with this type of operating means, the shaft 56 extends from only one side of the door for the reception of the single knob 61. A pin 64 extends rigidly from the. cam 58 remote from that side of the door upon which the knob 61 is mounted, this pin being so positioned upon the cam 58 that it may be engaged by a finger 65 mounted upon the thumb lever 63 inside the associated escutcheon plate" 66 to which the thumb lever 63 is pivotally mounted as at'67. It is to be understood that the pin 64is positioned upon the associated cam 58 to one side of the aperture 68 through which the shaft 56 extends, so that when the finger 65 is lifted by the thumb; lever 63, the pin 64 is lifted thereby to rotate the cam 58 andpwithdraw the bolt 43. For this purpose the finger 65 is formed of considerable width so that-movement of the pin 64 thereacross will be possible as the cam 58 rotates.

Means for locking tended position are provided in the form of a lock bolt71 which is slidable vertically with in an aperture 72 which is provided in a web 73 connecting the walls 9 of the housing 6 and within an aperture 74 in the bottom of the cylindrical portion], to be optionally received within the vertical slot 33 in the saddle 26 to lock it against movement within the housing 6. ,The upper end of the bolt 71 is formed concave with the radius of concavity corresponding with the radius of the cylindrical portion 7 of the housing 6 so that when the bolt 71 is withdrawn, the upper end 70 of the bolt 71 corresponds to the inner circumference of the cylindrical to rotate the shaft 56. If the con the latch bolt 43 in ex:

portion 7, permitting the saddle 26 to move therepast.

The partition 73 is rounded to provide the upper wall of the lower cylindrical portion 8 of the housin 6 within which a cylinder 75 is adapted toie rotated by a knurled knob 76 extending through the adjacent escutcheon plate 57. The cylinder 75 is of such length as to occupy less than half the length of the lower cylindrical portion 8; and a rod 77 extends rigidly from the center of the cylinder 75 substantially across the c'ylindri cal portion 8 to its opposite end. The lower end 78 of the bolt 71 is provided with a notch 79 which fits the rod 77 so that the vertical movement of the bolt 71 is guided thereby. A pair of spaced recesses 80 are provided adjacent the upper end 7 O of the'bolt 71, for a purpose to be disclosed hereinafter. A pair of arcuate lugs 81 are positioned upon the end 78 of the bolt 71 on each side of the notch 79, the pairs of lugs 81 being placed on opposing faces of the bolt 71 as clearly shown in Fig. 10. The lugs 81 on one side of the bolt 71 are adapted to be engaged by the wing 82 rigid with the inner end of the cylinder 75, whereby the bolt 71 may be extended into engagement with the saddle 26, or retracted therefrom by turning the knurled knob 76. A groove 83 extends across one side of the cylinder 75; and a rod 84 rigid with the housing 6, is disposed within the groove 83 to limit the rotary movement of the cylinder 75.

A plate 86 is positioned within the cylindrical portion 8 of the housing 6 on the other side of the lock bolt 71 from the cylinder 75. A key-hole 87 is provided in the plate 86 with the rod 77 extending through the large end thereof, so that a conventional barrel key may be inserted through the key-hole 87 over the rod 77 to engage the other pair of lugs.81 to extend and Withdraw the logkbolt 71.

It is to be understood however, that in the event it should be desirable to employ a cylinder lock, the plate 86 may be dispensed with and the rod 77 shortened sufliciently to permit the insertion of the cylinder lock 86' within the cylindrical portion 8, so that a projection 87 on the inner end of the cylinder of the lock may engage the lugs 81, as shown in Fig. 13.

It is to be observed that instead of employing separate mechanisms as a latch and lock respectively, my improved combined latch and lock utilizes a common latch bolt to serve both purposes. the latch ,bolt 63 in its extended position, the bolt 71 may be raised either by the knurled knob 76 or by key, into the groove 33 of the saddle 26 to rigidly'lock the saddle'against movement within the housing. Since the latch bolt 43 is mounted upon the saddle 26,

When it is desired to lock this engagement of the saddle by the lock bolt 71, prevents movement of the latch bolt 43.

'86 plate 86 containing the compression between a shoulder on the pin 88 and the end of the housing 89, urges the pin to seat within either of the recesses in the bolt 71, these recesses being positioned so that when the pin 88 is seated in the lower recess, the bolt 71 is in its uppermost position; and when the pin 88 is seatedinthe other recess, the bolt 71 is in its lowermost position.

\ It is to be observed that in the embodiment shown in Fig. 13, wherein the combined latch .20 and lock is mounted within an outside door 62, that instead of employing a door knob, the thumb lever 63 and a pitcher grip handle 91 is employed- Accordingly, it is essential that the latch be inverted so that the locking key-hole 87 and the associated key-hole 92 in the escutcheon plate 66, are above the pitcher grip handle 91.. If this were not the case, it would be difficult, if not impossible, to insert the key through the keyhole 92 because of the interference of the pitcher grip handle 91. Therefore, the use of a latch bolt guide 47 which is separate from the is important, particularly French doors,

the guide are necessarily rabbeted.

Accordingly, I have provided a specialtype of bolt guide 96 and strike plate 97 for use when my improved lockmechanism is '40 mounted in French doors. The bolt guide 96 is rabbeted to conform to the edge 98 of the French door in which the lock mechanism is mounted to provide a surface 99 flush Y with the edge 98 of the door, and a surface '45 101 to lie flush with the surface of the rabbet 102. Screw holes are provided in the surface .101 to permit vthe insertion of screws 103 to retain the guide 96 in position; and a portion 104 of the surface 99, projects above the sur- 5 face 101 toaccommodate an aperture 106 to slidably receive the latch bolt 43. The strike plate 97 adapted or use in conjunction with the bolt guide 96, is complementary thereto by being provided with a surface 111 over which the surface 101 of the bolt guide 96 slides, and a surface 112 over which the surface 99 slides when the door is closed. Thus the strike plate 97 conforms to the rabbeted edge of the other French door, co-operating with .thatin which the latch mechanism is mounted.

A portion 113 of the surface 112 extends into the portion 111 for the reception of the portion 104 of the surface '99 of the bolt guide 96; and holes 114 are provided in the surface other portions of the latch in the case of p where the edge of the door and 112 for the reception of screws to fasten the .strike plate 97 in position.

In installing the combined lock and latch of my invention, it 1s intended that the mechanism be positioned within the housing 6 before the housing is placed within the door, and that the assembled mechanism and housing be inserted in the aperture 12 of the door from the outer side, after which the outer escutcheon plate 57 isplaced'upon the exposed end of the shaft 56; and the knob- 61 then fastened to the exposed end-of the shaft. The .bolt 43 is then positioned by screwing the shank 51 into the hole 41 of the saddle 26. An aperture 115 makes it possible to look into the slot 29' to observe whether or not the end of .the shank 44 projects far enough to strike the shaft 56 and interfere with the withdrawal of the bolt '43. Then the inner escutcheon plate 57 is placed over the shaft and fastened securely in place by means of elongated screws 116, extending I through the inner escutcheon plate .through the door and into the outer escutcheon plate I as clearly shown in Figs 2 and 13. Thus it may be seen that but tw'o,screws are necessary to retainboth escutcheon plates in position and to hold the lock and latch mechanismand housing in proper position within the door. After the escutcheon plates'have been positioned as described, the inner knob 61 is fastened to the-inner end of the shaft 56.

The operation of the latch above described is substantially as, follows:

the knobs 61 or by the thumb lever 63 as th case might be, the cams 58 carried by the shaft 56 are similarly rotated sof-thattheir bounding radial edges 59 engage the

rounded surfaces

3,8

housin 6 to withdraw the bolt '43 against the actlon of the spring 51. Whenthe knob 61 or thumb. latch 63 is released, the spring 51 forces the bolt 43 outwards to extended position, which pulls with it the saddle 26 so 'that the lugs 36 return the'cams 58,'shaft 56 When the shaft 56 i turned by either of.

of the lugs 36 on the saddle 26. as described, to movethe saddle 26 acrossthe' and knobs 61 or thumb lever. 63 to normal position. r

.When it is desired to lock the door, this may be accomplished from the inside of the door byturning the knurled knob 7 6, or from the outside of the door by inserting the proper key-and turning it. This will raise the lock bolt 71 as above described,causing it to project into the slot 33 of the saddle 26, and

hold it against movement across the housing 6, so that the bolt43 tended'position. V

It is to be observed that all of the parts of the mechanism are symmetrical. Thus the housing 6 may be inserted into the door either end first; and the saddle 26 may be inserted ,is rigidly held in exwithin the housing orwhichever side of the housing maybe necessary, depending upon mechanism, in that it is impossible to insert them in reversed position. This is one of w the features which goes to the inexpensiveness of the device.

It is also to be observed that thelock and latch mechanism is composed of fewer parts than the conventional type. This tends toward cheapness of manufacture and ease of assembly. and also toward efficiency and ease of operation.

Various changes in the details of construction may be made without departing from the spirit and scope of the inventionfas de-,

fined by the appended claims.

Iclaim 1. In a combined door latch and lock, a spring-pressed latch bolt slidably mounted within said door, a shaft mounted for rotary movement transversely of said bolt, means on each side of the door for rotating the shaft, means associated with said shaft for retracting the bolt 'when the shaft is turned, and means operable by key from one side of the door and by knob from the other side of the door for locking and unlocking thebolt.

2. In a combined doorlatch and lock, a spring-pressed latch bolt slidably mounted within said door, means for varying the effective length of the bolt, a shaft mounted for rotary movement transversely of said bolt, means on each side of'the door for rotating the shaft, means associated with said shaft for retracting the bolt when the shaft is turned, and means operable, by key from one side of the door and byknob from the I other side of the door for locking and unlocking the bolt.

3. In a combined door latch and look, a spring-pressed latch bolt-slidably mounted within said door, a shaft mounted for rotary movement transversely of said bolt. means on each side of the door for rotating the shaft, a cam rigid with said shaft, a saddle rigid with said bolt, a projection on said saddle in. I

register with said cam whereby the bolt is retracted when the shaft is turned, and means operable bykey from one side of the door and by knob from the other side of the door for looking and unlocking the bolt. '4. In a door latch, a housing adapted to be rigidly mounted within a door, an escutcheon plate covering each end of the housing, a shaft extending through said'housing" and mount ed for rotar movement in said escutcheon plates, a sad le' mountedwithin said housing forgnovenient transversely thereof, a latch bolt secured at one endto said saddle and having its other end projecting through an edge of the door, .and a cam carried by the shaft in engagement with the saddle for mov'- ing the saddle to withdraw the bolt when the shaft is turned.

5. In a door latch, a housing adapted to be rigidly mounted within a door, an escutcheon plate covering each end of the housing, a shaft extending through said housing and mounted for rotary movement in said escutcheon plates, a saddle mounted within said housing for movement transversely thereof, a latch bolt threaded at one end to said saddle and having its other end projecting through an edge of the door, and a cam carried by the shaft in engagement with the saddle for moving the saddle to withdraw the bolt when the shaft is turned. r

6. In a door latch, a housing adapted to be rigidlymounted within a door, an escutcheon plate covering each end of the housing, a

shaft extending through said housing and mounted for rotary movement in said escutcheon plates, a saddle mounted within said housing for movement transversely thereof, a latch bolt threaded at one end to said saddle and having its other end an edge of the door,-

a cam carried by the shaft in engagement with'the saddle for moving the saddle to withdraw the bolt when the shaft is turned, and a guard plate adapted to be-secured to the edge of the door with the bolt extending through an aperture in the guard complementary in shape to the bolt.

7. In a door latch, a housing adapted to be rigidly mounted within a door, an escutcheon plate covering each end of the housing, a shaft extending through said housing and mounted for rotary movement in said escutcheon,

plates, a saddle mounted within said housihg for movement transversely thereof, a latch bolt threaded at one end to said saddle and having its other end projecting through an edge of the door, a cam carried by the shaft in engagement with the saddle for moving the saddle to withdraw the bolt when the shaft is turned, and a guard plate separate from otherportions of the latch and adapted to be secured to the edge of the door with the bolt extending through an aperture in the guard complementary in shape to the bolt.

8. In a door latch, a housing adapted to be rigidly mounted within a door, an escutcheon plate covering each end of the housing, a shaft extending through said housing and mounted for rotary movement in said escutche eon plates, a saddle mounted within said housing for movement transversely thereof, lugs extending from a side of the saddle, a

sector-shaped cam carried by said shaft with each of the bounding radii thereof in operative engagement with one of said lugs to move the saddle when .the shaft is turned, and a latch bolt secured at one end, to said saddle and having its other end.,projecting through an edge of the door;

9. In a door latch, a housing adapted to be rigidly mounted within a door, an escutcheon projecting through...

plate covering each end of the housing, a shaft extending through said housing and mounted for rotary movement in said escutcheon plates, a saddle mounted within said housing be rigidly mounted within a door, an escutcheon plate covering each end of the housing,

a shaft extending through said housing and mounted for rotary movement insaid I escutcheon plates, a saddle mounted within said housing for movement transversely thereof, lugs extending from a side of the saddle, a sector-shaped cam carried by said shaft with each of the-bounding radii thereof in operative engagement with one of said lugs to move the saddle when the shaft 15 turned, said sector-describing an arc of substantially ninety degrees, and a latch bolt threaded at one end to saidsaddle and having its other end projectingthroughan edge of the door.-

11, 'In a door latch, a housing adapted to be rigidly mounted within a door, an escutcheon plate covering each end .of the housing, a shaftextending through said housing and mounted for rotary movement in said escutcheon plates, a saddle mounted within said housing for movement transversely thereof,

lugs extending from .a side of the saddle, a

sector-shaped cam carried by said shaft with each of the bounding radii thereof in operative engagement with one of said lugs to move the saddle when the shaft is turned, a latch bolt secured atone end to said saddle and having its other end projecting through i an edge of the door, and a guard plate adapted to be secured to the edge of the door with the bolt extending through an aperture in the guard complementary in shape tothe bolt. 12. In a door latch, a housing adapted to be rigidly mounted within a door, an escutcheon plate covering each end of the housing, a shaft extending through said housing and mounted for rotary movement in said escutcheon plates, a saddle mounted within said housing for movement transversely thereof, lugs extending from a side of the saddle, a sector-shaped cam carried bysaid shaft with each of the bounding radii thereof in operative engagement with one of said lugs to move the saddle when the shaft is turned, a latch bolt secured at one end to said saddle and having its other end projecting through an edge of the door, and'a guard plate separate from the other .portions of the latch and adapted to be secured to the edge of the door with the bolt extending through an aperture in the guard complementary in shape to the bolt.

13. In a door latch, a housing adapted to be rigidly mounted Within a door,,a latch bolt slidably mounted within the door and extending from the housing, means within the housing for operating the bolt, and means for varying the' efl'ective length of the housing to fit doors of different thicknesses.

14;. In a door latch, a housing adapted to be rigidly mounted within a door, a latch bolt slidably mounted within the door and extending from the housing, means within the housing for operating the .bolt, and a spider rigidly securable to an end of said housing with the legs of the spider extending from the end of the housing to vary the effective length thereof.

16. Ina door latch, a housing adapted to be rigidly mounted within adoor, a shaft mounted longitudinally through said housing ,85 15. In a door latch, a housing adapted to for rotary movement therein, a pair of guides rigid with and extending transversely of the ,housing, a saddle slidable upon said guides and straddling the shaft, a latch bolt secured to said saddle and extending through an edge of the door, a sector-shaped cam rigid with the shaft adjacent each side of the'saddie, a lug associated with each of the bounding radii of said cam and extending laterally from the saddle, the surface of each lug adapted to engage the associated cam being rounded to produce a rolling movement of the cam thereover, a lock bolt slidably mounted within said housing to optionally engage.

said saddle to lock the latchbolt in extende position or to release the saddle, means operable by knob from one side of the door for actuating said lock bolt, and means operable by key from the other side of the door for operating said lock bolt.

17. In a door latch, a housing adapted to be mounted within an aperture in a door, and means for varying the eifective size of the housing to adapt the housing to apertures of different dimensions.

18. In a door latch, a be mounted within an aperture in a door, and means'for varying the effective length of the housing to fit doors of difierent dimen- SlOllS.

housing adapted "to BERT E. BARTHOLOMEW.