US2723148A

US2723148A - Sliding door lock

Info

Publication number: US2723148A
Application number: US329519A
Authority: US
Inventors: Jr Leonard E Johnson
Original assignee: KENNATRACK CORP
Current assignee: KENNATRACK Corp
Priority date: 1953-01-05
Filing date: 1953-01-05
Publication date: 1955-11-08
Anticipated expiration: 1972-11-08

Description

Nov. 8, 1

Filed Jan.

L. E. JOHNSON, JR

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Filed Jan. 5, 1953 INVENTOR.

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nited States Patent ()fiice 2,723,148 SLIDING DOOR LOCK Leonard E. Johnson, Jr., Elkhart, Ind., assignor to Kennatrack Corporation, Elkhart, Ind., a corporation of Indiana 3 Application January 5, 1953, Serial No. 329,519

6 Claims. (Cl. 292302) My present invention relates generally to latch or lock mechanisms and concerns more particularly lock mechanisms of the class utilized with sliding doors.

The need for a successful door lock for sliding doors and particularly the pocket variety of sliding doors has been long felt in the industry. Previous known devices of this character have been encumbered by numerous impediments which make their installation and operation unsuccessful for various reasons. In particular, the lock of my present invention is directed to an improvement over prior known devices of this character and has features embodied therein which makes the same adaptable for reverse installation to accommodate left or right hand pull doors, has features of adjustment to accommodate door widths of various sizes and permits the vertical adjustment of the door to which the same is attached without the need for relocating the lock. Other features of my lock include a new and improved latch mechanism embodying simple and improved means for engaging and releasing a stationary striker with which thesame cooperates and a new and improved self-aligning guide designed to pick-up and guide the striker into the'latch mechanism consistent with the rolling movement of the door. Pull means are also embodied in my improved lock mechanism thereby eliminating the need for a separate pull for retrieving the sliding door from its recessed position in the pocket. Means are also included therein for locking the latch mechanism so that the door may be secured in its closed position with facility and convenience to the operator.

The main objectof my present invention is to provide a new and improved lock means for sliding doors, par ticularly of the pocket variety, having features embodied therein which result in improved operating characteristics to the lock.

Another object of my present invention is 'to provide a lock mechanism for sliding doors having a new, im-

proved and simplified latching mechanism whereby *the same may be operated with minimum effort on thepart of the user.

A still further object of my present invention is to provide a new and improved lock mechanism for sliding doors in which means are provided for the self alignment of the lock with a separate striker;-the lock being movable with the door and the striker being normally fixed to a door frame or the like. 1 I

Still another object of my present invention is to provide a lock mechanism permitting vertical adjustment of the sliding door to which the lock of" my invention is attached without the need for relocating the lock to insure its proper operation. I

The above and further objects and features of mypresent invention will be recognized by one familiar with the art from the following detailed description thereof and with reference from time to time to ing drawings.

In the drawings: p v

Figure 1 is a side elevational view illustrating the door the accomp'any- 2 lock of my present invention in its installed relation with a door;

Figure 2 is an end elevational view looking substantially from the vantage line 22 of Figure 1 and demonstrating the finger pull and striker guide features embodied in my improved lock assembly;

Figure 3 is an end elevational view taken substantially along the vantage line 33 of Figure 1, looking at the right hand end of the lock assembly of Figure 1;

Figure 4 is a top plan view of the installed lock of Figure 1 taken substantially along line 44 of Figure 1 and illustrating in enlarged detail features of the latch assembly of my present invention;

Figure 5 is an enlarged partial side elevational view of the assembly illustrated in Figure 1, with one cover plate removed to demonstate the operational features and relation of the working elements of my new and improved lock assembly, particularly the latch mechanism therein;

Figures 6 and 7 are partial cross sectional views taken substantially along line 66 of Figure 5 and illustrating the operational positions of the latch pin and latch spreader of my invention.

Figure 8 is an enlarged partial cross sectional view taken substantially along line 88 of Figure 5 to demonstrate the operational features of the latch pin of my invention;

Figure 9 is an enlarged cross sectional view taken substantially along line 99 of Figure 5 and illustrating in particular the operation of the new and improved safety lock means utilized with the lock assembly of my invention;

Figure 10 is an enlarged cross sectional view taken substantially along line 10-10 of Figure 5 and showing the operational arrangement of elements of the latch mechanism of my improved door lock; and

Figure 11 is an enlarged partial cross sectional view taken substantially along line 11-11 of Figure 10 and illustrating the operational features of the safety lock means, and the working relation of the striker and latch elements of my lock assembly.

Turning now to the concepts of my new and improved lock assembly as illustrated in the drawings, it will be recognized from Figure 1, in particular, that my lock means 15 is constructed and arranged for attachment to a door I indicated generally at 16. My lock means 15 includes a cover assembly comprising similar right and left

hand side platemembers

20 and 21 respectively which are to be fitted on opposite faces of the door 16 and outwardly of a transversely related face plate member 22, as best shown in Figure 2 of the drawings. Each of the side plates is distinguished by an oval shaped and inwardly recessed portion 23 which may be formed conveniently by a suitable stamping operation, according to the configuration particularly illustrated in Figure 3 of the drawings. It will also be recognized that each of the oval recess portions 23 is provided with elongated slotted aperture 24 adjacent its right hand or rearward edge, as viewed in Figure 1, for the reception of latch operating handle, as

trated in their assembled condition with the

face plates

20 and 21. Itwill also be understood that by using such a connector between the two face plates, adjustment for accommodating various door thicknesses is made available.

-P'atented Nov. 8, 1955 From a study'of Figure 4 it will be seen that the

side plates

20 and 21 also are provided with inwardly turned flange portions 27 adjacent their left hand edge, as viewed in Figure l of the drawings, which flange portions are adapted to embrace the door edge and form-edge supports for the face plate 22.

The face plate 22 comprises a substantially elongated rectangular member, preferably of metal or a like rigid material and shaped as particularly illustrated in Figure 2 of the drawings. It will be seen that face plate 22 is provided with a finger receiving aperture 36 disposed intermediate its horizontal center line and the lower edge thereof as well as an approximately square opening 31 located adjacent its upper end which accommodates entryof astriker assembly 32. Plate 22 is also provided with screw receiving apertures adjacent its upper and lower ends for the reception ofscrew

fasteners

33, 33, or the like, which are utilized in engaging face plate 22 against leading edge 34 of the door 16. Openings are also provided in plate 22 immediately above and below the striker receiving aperture or opening 31 for the reception of fastening

bolts

35, 35 utilized in connecting the latch mechanism of my invention to the face plate as will be amplified later herein.

Mounted immediately adjacent face plate 22 and behind the finger hole opening 30 is a finger hole cover plate 37 which is held to the face plate 22' by means of one of the bolt fasteners 35'. The finger hole cover member is utilized for preventing the users finger from engaging the operating mechanism of the lock; the finger hole 39 being provided for the purpose of drawing the door, especially a pocket variety of sliding door, out of its recessed condition in the enclosing wall pocket. in this regard it will be recognized that the finger hole cover member 37 is provided with an offset planar platform portion 33 which is disposed in spaced parallelism rearwardly of face plate 22 when the cover member is assembled to the face plate, substantially as illustrated in Figure 1 of the drawings.

Latch assembly Turning now to the features of the latch mechanism of my improved lock assembly which is normally housed between the left and right hand side plates 2t) and 21 and behind face plate 22, as heretofore described, it will be recognized from Figures 4 and in particular that the working elements of the latch mechanism are either carried within or attached to a bi-part housing assembly indicated generally by numeral 40 and preferably formed of molded nylon or a similar wear resistant material. The nylon housing 40 includes a right hand half 40a and a left hand half 4012 as illustrated in Figures 4 and 8 of the drawings. These housing halves are so constructed and arranged as to interfit closely in assembly as will be observed from a study of Figures 2, and 11. The housing parts 49a and 4% are each respectively provided with

front flange portions

41a and 41b and when combined serve to define an internal chamber 43 therebetween for the reception of the striker assembly 32, as will be related presently.

From an inspection of Figures 2, l0 and 11, it will also be recognized that the chamber 43 is provided with an outwardly diverging throat portion 44 which serves to guide the entry of the striker assembly in the striker receiving chamber 43.

Flange portions

41a and 41b of the housing assembly 40 are also extended outwardly around the converging throat portion 44 to register against the periphery of opening 31 in the face plate and form a beaded lip 45 which assists in the proper assembly and alignment of the face plate 22.

As is shown in Figures 10 and 11, the right hand portion 40 of housing assembly 40 is provided with an outwardly projecting rectangular boss portion 46' located substantially vertically in central disposition at one side of the striker receiving aperture 43. This projecting boss portion 46 is provided with a series of vertically spaced cylindrical. apertures 47, 47 for the reception therein of coil springs 48, herein shown as three in number. Each of the coil springs 48 is fitted with a substantially cylindrical coaxially disposed spring pin 49 adjacent the striker receiver aperture 43 and preferably constructed of nylon or a like material. From an inspection of Figure 8, in particular, it will be recognized that the spring pins 49, 49 are provided with enlarged head portions 50 for frictionally engaging one side of a vertically disposed latch pin 52 mounted upright within the striker receiving aperture 43. Further, it will be seen that the latch pin 52 extends above and below the upper and lower walls 53 and 54 respectively, of the housing assembly 40 via substantially rectangular registeringly aligned

apertures

55, 55 provided for this purpose and illustrated best in Figure 8 of the drawings. It will also be recognized that the

apertures

55, 55 through which the end portions of the latchpin 52 extend terminate at one endapproximately onthecenter-- line of the strikerreceiving aperture 43 so as to limit the lateral movement of the striker pin as induced by the biasing force of spring members 48, 48 (see Figure 8). To prevent the vertical displacement of the latch pin 52 the projecting boss portion 46 of the right hand housing portion 40a is provided with overhanging

platform portions

56, 56 at its upper and lower ends which overlie the upper and lower ends of latch pin 43 in assembly.

It will thus beunderstood that when the latch mechanism is assembled with the

housing portions

40a and 4% which aretheld in mating relation by bolt means 57, 57 the latchpin 52 is adapted for lateral translation substantially half-way across the lateral dimension of the striker receiving aperture 43, as best shown in Figure 8. To provide for the actuation of the latch pin according to its desired lateral translation as specified, I have embodied a simplified mechanical linkage arrangement capable of manual manipulation by the user and designed toeffect the desired movement of the latch pin during unlatching operation of the lock.

To this end I employ a substantially U-shaped latch retractor member 60, preferably of metal or a like rigid material, and ofa dimension whereby the upper and

lower arm portions

61 and 62, respectively, thereof embrace and attritionally slide across the upper and lower walls 53and 54 respectively of the housing 40. In this regard theoutside walls of left and right

hand housing halves

40a and 40b are extended beyond the upper and lower walls 53 and 54 to form spaced upper and lower flange portionsv 63 and 64 respectively, which form a guideway for the sliding passage of the

latch retractor arms

61 and 62. Adjacent the outer ends of each of the

arm portions

61 and 62 of the U-shaped latch retractor, I have provided substantially triangular shaped

cam openings

65,, 65. having inclined cam surfaces 66 disposed in registering vertical alignment and adapted to engage-the upper and lower ends of the latch pin 52. This arrangement is best demonstrated in Figures 6, 7 and 8 of the drawings, from which it will be appreciated and understood that movement of the latch retractor to the rear or away from the face plate 22 causes a lateral displacement of the vertical latch pin 52 toward the right hand portion 40a of the housing assembly 40. This action serves to effect the release of the striker assembly 32- as will be explained more fully hereinafter. Con versely, movement of the latch retractor toward the face plate 22 permits the

spring members

48, 48 and the spring pins 49 to bias the latch pin 52 toward the vertical center line of the striker receiving aperture 43 until the same eventually reaches the position illustrated in Figures 6 and 10 of the drawings. Outward or opposite lateral displacement and biasing compression of the

spring members

48, 48 is of course caused by the rearward movement of the latch retractor 60 through the engagement of warm ng ed es 66 9 he latch fl ct r c re with the ends of the latch pin 52. It will also be recognized that the inward extent of the

triangular'camming apertures

65, 65 serves to limit the lateral movement of the latch pin toward the vertical center line of the striker receiving aperture 43. This relation is best illustrated in Figure 6 of the drawings.

Sliding actuation of the U-shaped latch retractor 60 is accomplished in a simple manner by means of a handle keeper member 70 which comprises a substantially bell crank linkage. From an inspection of Figure 5 of the drawings in particular, it will be noted that the handle keeper 70 is provided with a back plate portion 71 from the upper end of which are extended angularly disposed

arm portions

72, 72; there being two such arm portions disposed in spaced parallelism from opposite edges of the back portion 71 of the handle keeper. The upper extremity of each of the

arm portions

72, 72 is provided with an ear portion 73 through which is formed a central aperture for the reception of a keeper pin 74, as best seen in Figure 4 of the drawings. It further will be recognized from Figure 4, that the

arm portions

72, 72 are adapted to embrace the rearward end of the housing assembly 40 therebetween with the keeper pin passing through a suitable cylindrical aperture formed transversely of the housing assembly and thus providing a pivotal connection for the upper end of the handle keeper. Mounted intermediate the

ear portions

73, 73 and the lower end of the handle keeper, I have provided a roller member 75 mounted transversely between arm portions of the handle keeper and adapted for rolling movement on a pin axle 76, as shown best in Figures 4 and 11 of the drawings. The roller member 75 is adapted to have rolling engagement with the inside face of a back wall portion 71 of the U-shaped latch retractor so that counter-clockwise pivotal movement of the handle'keeper 70 to its dotted line position, as illustrated in Figure 5, will cause the biasing of the U-shaped latch retractor rearwardly to effect the lateral translation of the latch pin outwardly of chamber 43, as described herebefore.

Formed at the lower end of the back plate 71 of the handle keeper and projecting laterally outward therefrom, in coplanar relation, are

rectangular wing portions

78, 78, as best seen in Figure 3 of the drawings. Each wing portion 78 serves as a back rest for one of two

nylon handle members

79, 79 each having a trapezoidal shaped arm portion 80. The two handles 79 are insertable through the elongated apertures 24 of the two

face plates

20 and 21 and constitute the means by which the operator may effect manual operation of the handle keeper in actuating the latch pin; the operator having access to the arm portions 80 of the handlevia the indented recesses of the

side plates

20 and 21. Means for connecting the handle members 79 to the handle keeper comprises a rectangular metal handle clamp member 81 having lug elements 82 disposed at its-four corners for traversing upper and lower edges of the handle members and upper and lower edges of the

wing portions

78, 78 of the handle keeper. Rigid connection between the back portion 71 of the handle keeper and the handle clamp 81 is effected by means of a self-tapping screw member 83 or a like rigid fastener. By loosening the fastener 83 and sliding the two handles 79 laterally of the handle

keeper wing portions

78, 78, means are provided for adjustably positioning the handle members to accommodate variations in door thicknesses.

From the above description it Will be recognized that by combining various elements described in the manner related, a latching function is performed by laterally reciprocating the latch pin 52 substantially half-way across the striker receiving aperture 43 of the nylon housing assembly 40. In order to perform a locking function, or that is to latch a sliding panel door, or the like, in a closed condition, it is necessary that the latch mechanism described hereabove be related with a stationary element such as the striker assembly 32.

Striker assembly The striker assembly 32, as seen particularly in Figures 1, 4, 10 and 11 comprises a striker plate having apertures for the passage of wood screws 86, 86, or like fasteners, and a centrally disposed striker pin 87. The striker pin is formed as a substantially cylindrical rod having a cutout portion 88 adjacent its outer end which is adapted to engage and lock with the vertical latch pin 52. The leading end of the striker pin is bullet shaped to bias the latch pin laterally of chamber 43, against the force of springs 48, as the striker homes in chamber 43. It will be understood and recognized that the striker assembly 32, and particularly the striker plate 85 is to be attached firmly to a stationary frame member, such as a.

door jamb 89 or the like, so that the striker pin may look with the latch pin in accordance with the closing movements of the door with which the lock assembly of my present invention is associated.

In regard to the operation of the striker pin and its alignment with the striker chamber 43, it will be appreciated that the funnel-like formation of the throat portion 44 of the striker chamber 43 permits automatic guiding or self-aligning action of the lock and sliding door as the same approach the stationary striker pin 87. This feature permits locking engagement with the stationary striker assembly by merely closing the sliding door according to its normal closing lateral motion.

It will also be understood and appreciated that the cylindrical diameter of the striker pin is somewhat smaller than the vertical and lateral dimensions of the striker chamber 43. This feature enables vertical and lateral plumbing and adjustment of the door relative to the stationary striker without the need for relocating the striker assembly or the lock assembly. The advantage of such a feature and relationship between the lock assembly, particularly the latch mechanism therein, and the striker assembly will be readily recognized to those familiar with the art.

Safety lock In addition to the striker assembly and latch assembly of my newand improved door lock, as hereabove described, I have also included an improved safety lock feature designed to permit the selective locking of the latch with the stationary striker from either side of the door, as desired, or from only one side, as in the particular embodiment herein illustrated. To this end, the nylon housing assembly 40 is provided with a rotatable locking cam member 90 comprising a substantially rectangular shaped tubular member made of nylon or like material, and having two, diametrically opposed, curved locking

cam lug portions

91, 91 projecting from opposite sides thereof, substantially as illustrated in Figures 10 and 11 of the drawings. A cylindrical, annular shoulder portion 92 is formed integrally with the tubular member 90 immediately adjacent the raised cam lugs 91 thereon and a similar annular Washer 93, removable for reasons of assembly, is provided on the opposite side of the raised cam lugs (see Figure 10). The shoulder portion 92 and annular washer member 93 are adapted for registering insertion in cylindrical recessed openings 94, 94 formed inwardly of the inner or engaging faces of the two housing portions 40a and 4012. A pair of lock pins 95, 95 herein illustrated as substantially cylindrical rod members, are slidingly mounted in coaxial openings communicating with the upper and lower walls 53 and 54 of the housing assembly, such apertures having enlarged cylindrical portions 96 adjacent their lower ends for the reception of compression springs 97, 97. Each compression spring engages an enlarged head end 97 of a lock pin and a shoulder portion 98 formed at the intersection of the enlarged cylindrical portion 96 of the lock pin' aperture and the remaining cylindrical portion thereof. The head ends 98 of the lock pins 95 are of course designed to engage with the cam lugs 91. As

will best be understoodfrom an inspection of Figure 11 of the drawings, the turning of the tubular member 90 in a direction whereby the raised cam lugs 91 thereonengage the head ends of the lock pins to compress spring members 97, causes the thrusting of the lock pins upwardly and downwardly through the upper and lower walls of the housing 40 so that the same protrude in an interfering manner with the sliding passage of the U-shaped latch retractor. To permit such protrusion of the lock pins,

apertures

99, 99 are formed in the

arm portions

61 and 62 of the latch retractor. Therefore, with the lock pins extending into such apertures 99, prevention of rectilinear reciprocation of the latch retractor is effectively brought about.

To operate this safety lock the tubular cam member 96 may be rotated, as desired, from its Figure 9 to its Figure 11 position by a handle member positioned outwardly of one of the side plates 21 or' 22, as best seen in Figure 9 of the drawings. At the opposite end of the tubular member from handle 100, a safety button 191 is provided outwardly of the other side plate; it being understood that operation of the safety lock may then take place from one side of the lock only, or that side which is provided with the operating handle member 10%. Operating engagement of the handle and safety button means with the tubular cam member 90, is made by inserting rectangular shaped end portions 102 of each member 1th) and 1&1 in the hollow interior of the tubular member 90 which is formed correspondingly rectangular for that purpose (see Figure 9). Holding the handle member 1% and safety button 101 for rotational movement relative to the

side plates

20 and 21 and preventing the withdrawal thereof from cam member 90, are small hair pin shaped spring members 103 designed to lock with reduced shank portions 104 of the safety button and handle members, as illustrated best in Figure 9.

Thus it will be recognized that I have herein described and illustrated a new and improved door lock assembly having special adaptation and utility in conjunction with sliding doors and particularly with the pocket variety of sliding door. It will also be appreciated that a convenient finger pull means 36 is provided for the recovery of the door from its recessed position in the wall pocket and that the indentations 23 provide a convenient finger grip, for imparting sliding motion to the door in operation. The lock of my invention also includes a new and improved latch means designed to rectilinearly move a vertical latch pin laterally of a striker receiving chamber bringing about effective and eflicient engaging and disengaging operation of the latch mechanism with a stationary striker. Safety lock means of an improved variety are also included, giviru simplified and convenient locking function to the lock of my invention. Ready disengagement of the spring loaded latch pin with the stationary keeper is easily effected by depression of the handle members '79, 79 which protrude inwardly of the recessed portions 23 of the side plates as illustrated in the drawings and described hereabove.

All in all, the features of my new and improved lock bring forth an advancement in the art over prior known devices of this character while the utilization of structural materials such as nylon for the majority of the working parts and'metal for certain of the wear parts, such as the striker pin and latch pin assemblies, spells improved life and ruggedness for a lock of the class described. It will also be recognized and appreciated that the utility of material such as nylon for the working parts of the latch mechanism, particularly the housing and rotatable parts thereof, eliminates the need for lubrication; a feature having major importance in decorative locks of this character.

Therefore, it will be understood that while I have herein shown. and described the features and improvements of my invention as related to a preferred embodiment thereof, it is fully contemplated that various. changes,

modifications and substitutions of equivalents may be made therein without departing from the spirit and scope of my invention. Consequently, I do not wish to be limited tothe specific illustrative embodiment herein described except as may appear in the following appended claims.

I claim:

1. A door lock for use with sliding doors, comprising,.

a bi-part housing enclosing a striker receiving chamber which opens inwardly of the front wall of said housing, said chamber having a throat portion at its entry end diverging angularly outward from within said housing, a vertical latch pin mounted within said housing, across said chamber, said latch pinoeing arranged for horizontal translation parallel to its own longitudinal axis intermediate a position adjacent the longitudinal axis of said chamber and a position located outwardly of one of said chambers side walls, a substantially U-shaped latch retractor embracing top, bottom and rear end walls of said housing and arranged for rectilinear translation in a direction transversely of theplane of movement of said latch pin, said latchretractor having camming apertures adjacent the free ends of its arm portions for engaging opposite end portions of said latch pin which project outwardly of the top and'bottom walls of said housing whereby rectilinearv movement of said latch retractor serves to translate said latch pin sideways relative to said chamber.

2. In a door lock of the class described for use with slidingdoors, a latch assembly comprising, a latch housing having an internal striker receiving chamber, an elongated latch pin carried by said housing and extending through said chamber transversely of the path of movement of said striker pin as it enters said chamber, means for translating said latch pin rectilinearlyparallel to its own longitudinal axis and toward the central axis of said chamber, latch retractor means engageable with opposite ends of said latch pinand having camming apertures arranged to, bias saidlatch pin rectilinearly parallel its own longitudinal axis to a position laterally outward of said chamber, said latch retractor means being arranged for rectilinear movement transversely of the axis of said latch pin, link means pivotally supported on said housing, roller means carried by said link means in rolling engagement with said latch retractor, handle means manually accessible exteriorly of said housing for displacing said link means thereby to rectilinearly move said latch retractor, rotatable locking cam means having diametrically opposed, cam lugs carried by said housing, and

, spring loaded lock pin means adjacent with said rotatable locking cam means, said locking pin means engaging apertures in said latch retractor for preventing rectilinear movement thereof upon the selective rotation of said rotatable cam means to a position wherein said cam lugs thereon engage said locking pin means.

3. A. door lock assembly of the class described for use with sliding doors, comprising in combination, housing means carriedfat one edge of a door, an internal chamher in saidhousing means. opening convergingly inward of oneend wall. thereof and. adapted to receive a striker pin, alatch pin mounted within said housing for rectilinear translationina plane paralleling its own longitudinal axis and traversing. the axis of said chamber, such movementoccurring between a position outside of said chamber and a position substantially adjacent the longitudinal axis thereof, spring meansbiasing said latch pin to its said position within said chamber, manually actuated cam means simultaneously engaged with both ends of said'latch pin and moveable transversely of the latters longitudinal axis, movement of said cam means serving normally to move said latch pin against the biasing force-of said spring means and dispose the same bodily outward of said chamber thereby disengaging such from the strikerpin, and safety lock means selectively operable to prevent movement of said cam means thereby immobilizing said latch pin.

4. A lock assembly for use with sliding doors, comprising, a housing means carried in one edge of a door, said housing means having an internal chamber opening inwardly at one end wall thereof, the entry end of said chamber being distinguished by an inwardly converging throat portion, a vertical latch pin means mounted in said housing and movable in a plane paralleling its own longitudinal axis and traversing the longitudinal axis of said chamber, spring means arranged to normally bias said latch pin toward said chambers longitudinal axis, a U-shaped latch retractor connected with both ends of said latch pin exteriorly of said housing, a cam surface means formed on said latch retractor at its areas of engagement with said latch pin, a pivotally moveable link means forming a bell crank lever system, and a roller means carried by said link means to engage said retractor whereby motivating said link means causes rectilinear movement of said retractor transversely of the axis of said latch pin with movement of said retractor in one direction serving to withdraw said latch pin from the interior of said chamber.

5. A door lock assembly of the class described mountable in a recess at one edge of a sliding door or the like, comprising, a pair of spaced side plate members, each having a central indented portion and mountable in opposite faces of the door; a face plate mounted transversely of said side plates at one edge thereof and across a side edge of the door, said face plate having a finger opening formed therethrough and an aperture, a latch housing mounted behind said face plate intermediate said side plates, said housing having a chamber opening inwardly of one end thereof in communication with the said aperture in said face plate, a latch pin mounted in said housing to move rectilinearly in a plane paralleling its own longitudinal axis from outside said chamber to the interior thereof, a latch retractor engageable with opposite ends of said latch pin outwardly of said chamber, camming apertures formed in said latch retractor for receiving the opposite ends of said latch pin, link means mounted on said housing, a roller means carried by said link means for engaging said retractor whereby rectilinear translation of the retractor in one direction, responsive to pivotal movement of said link means, causes said camming apertures to withdraw said latch pin from the interior of said chamber, compressible spring means opposing the withdrawal of side latch pin, and handle means operatively connected to said link means and manually accessible at said indented portions of both said side plate members for operating said retractor.

6. In a door lock of the class described for use with sliding doors, the combination comprising, a latch housing having an internal striker receiving chamber, a throat portion in said chamber opening converging inwardly of one wall thereof, and acting as a guide means, an elongated latch pin carried by said housing transversely of the longitudinal axis of said chamber, end portions of said latch pin extending outwardly of upper and lower walls of said housing through registering aligned apertures communicating with said chamber, a U-shaped latch retractor having arm portions embracing said housings upper and lower walls, said arm portions having camming apertures receiving said end portions of said latch pin, camming surfaces formed along one edge of said camming apertures for engaging said latch pin, a manually operated pivotal link means carrying a roller means for engaging said retractor, movement of said link means rectilinearly moving said retractor in the one direction causing said camming surfaces to bias the latch pin to a position located outwardly of said chamber, spring means carried by said housing and engageable with said latch pin for normally biasing said latch pin to a position within said chamber, rotatable cam means carried by said housing intermediate the arms of said latch retractor, and spring loaded locking pin means movable by said cam means into interfering engagement with said latch retractor thereby to prevent its said rectilinear displacement.

References Cited in the file of this patent UNITED STATES PATENTS 1,558,522 Watson et al. Oct. 27, 1925 1,561,129 Weymann Nov. 10, 1925 1,594,084 Weymann July 27, 1926 2,284,180 Thomas May 26, 1942 FOREIGN PATENTS 298,011 Great Britain Oct. 4, 1928 602,014 Great Britain May 18, 1948