US2960858A

US2960858A - Closure fastening device

Info

Publication number: US2960858A
Authority: US
Inventors: Webster Desmond Edward Charles
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-10-08
Filing date: 1957-10-08
Publication date: 1960-11-22
Anticipated expiration: 1977-11-22

Description

Nov, 22, 1,960 D. E. c. WEBSTER 2,960,858

cLosURE FASTENING DEVICE Filed Oct. 8, 1957 2 Sheets-Sheet l ,-5/4/ 49 i5 I0 l f2, \\3-5 r 52520/3545 40 Inventor ttorney aired States CLGSURE FAS'EENING DEVICE Desmond Edward Charles Webster, Plumstead, Cape Town, Cape Province, Union of South Africa A. Webster, 1 St. Johns Mansions, St. Johns Road, Sea Point, Cape Town, Cape Province, Union of South Africa) Filled ct. 8, 1957, Ser. No. 688,998

Claims priority, application Union of South Africa Oct. 8, 1956 22 Claims. (Cl. 713-150) This invention relates to fastening devices such as locks used on doors7 windows and/or the like and is more particularly of a kind having xed handles while retraction of the latch bolt or the like is effected by push button means.

An object of this invention is to provide a lock of the said kind which is of simple but robust construction and which may incorporate key operated locking means to render the push button and latch simultaneously immovable so that, in the case of a closure, such as a door, it cannot be opened by depression of the push button unless the key operated locking means has been operated.

A further object of this invention is to provide a door lock which requires the boring of only two intersecting holes for tting the lock whereby the actual lock tting is readily and speedily performed. A still further object of this invention is to provide a lock for mounting within doors of varying thicknesses without such lock requiring modification or substitution of differently sized parts.

A still further object of this invention is to provide a door lock which is easily assembled while incorrect assembly of such lock is not possible. A still further object of this invention is to provide a door lock or the like which may be used in an inverted position without the position of mounting such lock atfecting the operation thereof.

According to this invention, the fastening device comprises, a hollow casing locating an axially slidable latch bolt which is resiliently biased in an outward direction, a latch bolt providing on its inner end an inwardly and axially directed extension mounting a perpendicular projection in spaced relationship to the rear end of the bolt, two forwardly converging faces on the side of the projection directed towards the bolt, a guided slide eX- tending transversely through the casing and between the projection and the bolt, a V-shaped notch in the rear side of the slide formed by converging faces which are engaged by the converging faces of the perpendicular projection for such faces to be slidable on one another when the slide is displaced in the direction of its longitudinal axis whereby said projection and the bolt are moved in a rearward direction for retraction of the bolt against the action of resilient biasing means and which means effects extension of the bolt and return of the slide to the normal position on release of pressure applied for causing movement of the slide.

Locking means for said fastening device comprises 'a wire-like strip rotatably associated in the slide and provided at an intermediate region with a crank-like forma tion of U or V shape which is adapted to embrace the perpendicular projection of the latch bolt when such locking strip is in one of two alternate positions to prevent relative movement of the bolt and the slide while when said locking strip is in the other alternate position the said cranked region is in a position freeing said perpendicular projection of the bolt permitting movement of the slide and retraction of the bolt when pressure is applied to either end of such slide. The rotary movement of the locking strip from the one alternate position to the other alternate position is preferably but may, if particularly desired, be 180. The movement of the locking strip from one alternate position to the other is such that the crank region is swung over the free end of the perpendicular projection of the latch extension.

At least one end of the wire-like locking strip is coupled to a knob or small lever part whereby the locking strip is rotated through the desired angle to the alternate position while said knob or the like also forms the push button for the slide. In a preferred form of construction, one end of said wirelike locking strip is associated with a rotary barrel or pin tumbler lock provided in the corresponding end of the slide so that only on receipt of Ithe correct key in the lock can rotation of the trip be effected from that side of the door at which the said lock is provided. More particularly, one end of said strip is associated with a rotary barrel or pin tumbler lock whereas the other end, on the opposite side of Athe door, is associated with a knob or small lever. it should be understood that the locking strip and the said lock and knob or the like move axially with the slide when retraction of the latch bolt has to take place. The ends of the locking strip are preferably bent at right angles to form crank-like arms which are engaged in radial slots provided in the lock barrel and the knob, saidy end engaging the knob or the like being retained in position in removable fashion.

Said locking strip is located axially in the slide while a rebate or like recess is preferably provided in one face of the slide adjacent the apex region of the V-shaped notch for receiving the crank region of the locking strip when the latter is in the non-locking position, i.e. when not embracing the perpendicular projection of the latch bolt extension.

In order that the present invention may be more clearly understood and carried into effect, reference will now be made to the accompanying sheets of drawings, on which like reference numerals refer to like parts throughout the several views.

1n the drawings:

Figure l is a horizontal cross-section of a door lock constructed according to this invention and shown in position when tted to a door;

Figure 2 is a cross-section on line II-lI of Figure l, not showing the door;

Figure 3 is a cross-section on line III-III of Figure l, showing the bolt in elevation and not showing the door;

Figure 4 is a fragmentary oblique view of the bolt casing;

Figure 5 is an oblique View of the latch bolt operating slide;

Figure 6 is a view of the latch bolt locking strip:

Figure 7 is an end view of the latch bolt operating slide with the locking strip in position;

Figures 8 and 9 are fragmentary side views of the rear end of the latch bolt showing two modified `forms of construction;

Figure 10 is an oblique view of an operating knob for the latch bolt operating slide and locking strip;

Figure 1l is an elevation of a casing on to which the fixed door handles are connected and whereby the latch bolt casing is fixed and located;

Figure 12 is an oblique view showing the door handle connector casing and latch bolt casing in their coacting positions and showing additional features;

Figure 13 is an exploded oblique view of a handle and ferrule for securing the handle to the handle connector casing;

Figure `14 is a side View of the ferrule shown in Figure 13;'a1'id Figure 15 is a side View of a latch bolt operating slide forV a lock operable from one side of the door only.

Referring to the drawings, the latch bolt, which also forrnsthe locking bolt, is denoted by reference numeral 1. The bolt 1 provides a rearwardly projecting eccentrically disposed extension 2 of reduced width and mountin'go'n the Vrear end a perpendicular projection 3. The bolt '1, which is conveniently of cylindrical shape, is slidable within a cylindrical casing 4 for engaging a hole bored into an upright end of a door 5. On one side of the bolt 1,7a flat surface 6 is provided for engaging a correspondingly shaped internal face 7 of the casing 4 to align the bolt 1 within the casing 4. The cavity in the rear half region of casing 1 is of reduced dimensions as 'compared with the bolt engaging front region and provides a substantially diametrical parallel walled cavity 8 in which the extension 2 and perpendicular projections 3 extend in guided slidable fashion. Said reduced cavity region 8 of the casing 4 forms shoulders 9 which provide stops for a disc or backing plate 10 on which a compression spring 11, which resiliently biases the bolt in an outward direction, is adapted to bear.

The casing 4 provides transverse openings 12 in opposite sides for extension therethrough of the transversely disposed operating slide 13. Said slide 13 is adapted to effect the retraction of the bolt 1 when the slide is displaced in the direction of its axis and against the action of spring 11. Said side openings 12 are located in the smaller cavity region of the casing 4. The operating slide 13 comprises a substantially at bar-like element 14 arranged with its major faces horizontally and having a deep V-shaped notch 1'5 in its -rearwardly disposed part. Said notch 15 is adapted to engage forwardly converging faces 1e of the perpendicular projection 3 of bolt 1. The bar-like element 14 is provided on one face and along its front region with a longitudinal rib 17 in which the apex region of the notch 15 extends while in the converging faces forming such notch in the bar-like element smaller notches 18 are cut. Said rib 17 strengthens the slide 13 and in addition ensures correct assembly of the slide 13 in the casing 4 by providing the opening 12 of the casing with a notch-like extension corresponding to the shape of such rib.

One end of the said bar-like element 14 is provided with a hollow tubular part 19 having a closed connecting end 20 in which a radial groove 21 is provided. The other end of said flat element 14 is of reduced shape as at 22. Said reduced end 22 provides rounded longitudinal sides 23 for rotatable engagement in operating knob 24. Operating Yknob 24 provides an axial hole 25 extending along apart of the length of such knob and further provides a kdeep radial groove 26 in one side. Groove 26 communicates with the hole 25. One side of the groove 26 is in inclined relationship relative to the other side as at 27 but forrns a shoulder 28 adjacent the holed end of the knob. Said holed end of the knob is provided with a wide notch-'like recess '29 which forms shoulders 30: for engaging the upper and lower face regions 31 of slide 13 so that rotation of the knob 24 Von the slide 13 is limited to 90.

he means for locking. the bolt 1 in the extended position consists of a rigid wire-like strip 32 rotatably housed in the slide and Iproviding a cranked region 33, of substantiallyU shape, at an intermediate part and arranged to correspond with the apex region of the notch 15. Said cranked region 33, when in its inoperative position, is adapted to be located in the small notches 18 provided in the faces of notch 15 while'in its operative lock-ing position it is swung through an angle of 90 over the free end of projection?, in vorder to embrace such projection which thus becomes Vinntti'ovably retained be- Vof the door.

4 tween the apex region of notch 15 and such cranked part 33.

The said strip 32 is rotatably located in a longitudinal groove 34 provided in the slide 13 and which groove, after reception of the strip 32, is covered by a covering plate 35. Said covering plate 35 is located in recesses provided in the bar-like element 14 and also provides the notch 15 which is, however, void of the small notches 18 in order to form shoulders 37 with notches 18. Said shoulders 37 serve as stops for limiting the movement of the cranked region 33 of the locking strip 32 to its operative horizontal locking position -around the projection 3.

One end of the strip 32 isbent at right angles to form a crank arm 36 whereas the other end is bent to substantially hook shape as at 38, the plane of said hookshaped end region being angularly disposed relative to the major part of the locking strip 32. The tip part 39 of said hook-shaped end 38 is of curved shape and is adapted to resiliently engage either of two adjacent faces of the reduced end region 22 of slide 13 to act spring clip fashion in order to resist movement of the strip from one alternate position to the other alternate position. Such resistance is offered by said hook-shaped end 38 requiring outward bending against the resiliency of its material when forced over the corner formed between said adjacent faces of the reduced end region 22 of slide 13. Further, said hooked end 38 is adapted to be retained in the radial groove 26 of the knob 24. The tip part 39 is arranged to engage the shoulder 28 of groove 26 to prevent unintentional separation of the knob 24 from the slide 13.

The crank arm end 36 of strip 32 is adapted to extend through the radial groove 21 into the tubular part 19 and arranged to be coupled to the inner end of the barrel 40 of a rotary pin or tumbler lock located in the part 19. The crank arm'36 is preferably hooked through an axial hole in the barrel and arranged to engage a sectorshaped notch 41 Yprovided, injsuch barrel 4i).V With the barrel 40 and tubular part 19 a torsion spring 42 is associa'ted for normally rotating the barrel to its normal position for automatic engagement of the pins 43 with groove 44 provided in part 19 to permit removal and insertion of the key. The sector-shaped notch 41 permits V" movement of the strip 32 relative to the barrel 40 when such strip 32 is rotated by knob 24. The door handles 46 for usewith'the lock according to this invention are adapted Vto be iixed to the door 5 and do not effect retraction of the bolt as is the normal 'arrangement in locks. Each handle 46 provides an annular end 47 in which the knob 24 or part Y19 is oscillatably and s'lidably located. In the form of construction as shown in Figure 1, the handles 46 (of which only one is shown) are provided with holes (not shown) for iixing to the door lfaces' by means of screws or bolts (also not shown), the bolts being preferable for simultaneously ixin'g'both yha'tndles and are adapted to extend transversely through Vthe door for lxinglfrom the inside vface The annular end 470i each handle 46 is 'provided 'with 'a taperingrbore 48 which widens towards the door engaging side 'so Vtliat incase of irregularities of the door faces or when such door faces are not parallel, the movement of the knob 24 and part 19 will not be impaired. The bore 48 also provides an annular recess 49 for receiving the end part of a transverse casing 50. Said transverse casing 50, which is chieiiy intended to form a dust cover, conveniently comprises a thin walled tubular member providing a large transverse hole at its center through which the bolt casing 4 is extended (see Figures l, 2 and 3).

In the preferred form of fixing the handles 46, as is shown in Figures l2, 13 and 14, the tubular transverse casing 58a is provided with screw-threaded ends 51 Von to which internally'screw-threaded ferrules '52are adapted to be'screwe'd. Each ferrule 52 providesV a =x`ed 'luglike projection 53 on the outside for engaging a corresponding recess 54 in the bore of the annular end 47 of a handle 46 so that fcr screwing of the ferrule 52 on to a screw-threaded end 51 such ferrule is firstly placed into the bore of the handle and is rotated by rotating handles until the handle is tightly against the door. When both handles are screwed tightly on to the door, the ends of such handles, distant from the said annular ends 47, are iixed to the door preferably by means of a bolt which connects both handles together. The said ferrules 52 provide flanged outer ends 55 which are .adapted to engage the outer end of the annular handle ends 47 but preferably engage annular recesses 56 provided in said end of the handles 46.

To ensure that the casing 4 and transverse casing 50a are properly aligned, the exterior surface of casing 4 may be provided with longitudinal flats 57 while the transverse hole 58 of casing 50a is provided with corresponding ats 59 on the edges so that tilting of the casing 4 relative to the casing 50a is prevented. If desired, the casing 4 may be provided with longitudinal grooves 60 and the part 50a with small projections 61 in the hole 58 for the same purpose.

The lock according to this invention may be operated from one side of the door only, such as when applied to a cupboard door or the like. For such purposes, a slide as shown in Figure l5 may be employed. The slide i3d, as shown in Figure l5, provides a V-shaped notch 15 of which one tapering face is of short length and provided with a stop extension 62. The length of the slide 13a is shorter than of slide 13 and does not extend completely through the door. If locking means is to be incorporated in the lock, a shorter locking strip 32 is also associated with the slide 13a while lock barrel 40 is disposed within the part 19 as previously described. lf locking is not required, the strip 32 is not used while the part 19 may be of solid construction to act only as a push button.

On the forwardly directed face of the

slide

13 or 13a a depression 63 is provided which is adapted to be engaged by a suitably shaped, c g. rounded-01T, projection 64 provided on the disc 10 so that for sliding of the

slide

13 or 13a displacement of the disc 9 is necessary against the action of spring 11. The spring 11, apart from normally biasing the bolt 1 to the extended position, also returns the

slide

13 or 13a to the normal central position due to the engagement of a converging face 16 of projection 3 with a converging face of notch 15.

On the rear end of the bolt extension 2 an additional perpendicular projection 65 may be mounted which is disposed in spaced relationship behind the projection 3 (see Figure 8). Such additional projection 65 is of greater length than projection 3 for the end regions of such projection 65 to slidingly engage guide grooves internally of the casing 4 to provide additional means for guiding and tilt preventing means for the bolt within the casing 4. ln a modified form of this feature rollers 66 may be provided on the end regions of projection 65a (see Figure 9). The said rollers 66 may be provided for easier movement of the bolt.

The casing 4 is preferably provided with a fixing flange 67 on its outer end which is adapted to be received in a recess provided in the door end face 68 and is further secured by screws passing through eountersunk holes 69 provided in such flange 67.

In order to cause retraction of the bolt 1 against the action of spring 11, pressure is applied to the outwardly directed end of either knob 24 or part 19 and the lock barrel to cause axial movement of the slide 13 which, by virtue of the engagement of the notch forming faces of notch 15 on the forwardly converging faces 16 of projection 3 causes one of the faces 16 to ride and slide on a face of notch l5, The slide 13 is guided for movement transversely relative to the axis of the bolt 1 and casing 4 and consequently the projection 3 and associated bolt 1 are moved in an inward direction for retraction of the bolt 1. On release of pressure on knob 24 or part 19, the spring 11 extends the bolt 1 and due to 4the sliding engagement of a face 16 on a face of notch 14 the slide 13 is returned to its normal or central position.

When the slide 13 is in its normal or central position,- the slide and bolt 4 may be locked together by rotation of the locking strip 32 through an angle of 90 from a vertical position of the cranked part 33 to a horizontal position. In the latter position the cranked region 33 embraces the projection 3 (see chain dotted outline in Figure l). The rotation of the strip 32 is effected by rotating the knob 24 or the lock barrel 40. Rotation of the knob 24 and strip 32 is through an angle of 90 while locking by means of barrel 40 requires rotation of the latter to an extent of due to the provision of the sector-shaped notch in the barrel engaged by crank arm 36 of strip 32. Consequently, when locking is effected by turning the knob 24, the barrel 40 is not moved but when the barrel 40 is rotated by the proper key the knob 24 rotates with the barrel.

The disc 10 is provided with a notch for riding on the bolt extension 2. Said extension 2 preferably, but not necessarily, provides a thickened region 70 adjacent and forwardly of the projection 3 and provides a cam-like portion 71 so that after placing the bolt in the casing 4 said cam-like region 71 may effect a wedging action on the disc 10 for clamping said disc 10 rigidly within the casing 4 so that the bolt cannot drop from the casing. For releasing the disc 10 once the casing 4 has been fitted in a door, a wire-like element is pressed against the rear face of the disc, such element being extended through one of the transverse openings 12 of casing 4.

In the aforegoing description, the locking strip 32 is capable only of rotation through an angle of 90. If desired, the lock may be constructed so that said strip must be rotated through an angle of In such case, the slide would be void of the rib 17 or a notch would be provided in such rib for receiving the crank portion 33 of the strip 32 when in the inoperative non-locking position.

Door thicknesses do not materially affect the lock according to this invention. A door lock constructed according to this invention may be used on doors of different thicknesses, e.g. from l" to 1% without requiring any alteration of the lock, the press buttons, knobs or such other parts protruding more or less through the handles as the case may be. If desired, felt, plastic material or rubber buffers may be mounted interiorly of the lock to provide cushions between the knob 24 and part 19 and the casings in order to silence the impact of such parts when striking one another.

The invention is not limited to the precise construction as set out above, since it may be altered without departing from the basic features and scope of the invention.

I claim:

l. In a fastening device for doors arranged to fit within a cylindrical recess formed in the edge of the door and a circular hole formed transversely in the door and intersecting said recess, the combination of a cylindrical bolt casing ttable in said recess, a biased latch bolt retractably mounted within said bolt casing, the end of said bolt within the casing is of reduced thickness in the vertical direction, said casing having internal longitudinal grooves in which said bolt is slidable, a perpendicular projection on substantially said end of said bolt, said projection having two converging faces on the side of the projection converging in the direction of extension of the bolt, a guided actuating slide extending transversely through the casing and through a space formed by the reduced end of the bolt and the projection, said actuating slide having a V-shaped notch in one longitudinal side of the slide 7 formed by two converging faces which slidably engage the converging'faces of said perpendicular projection for displacing the bolt in the direction of its Vaxis on displacement'of vthe slide in the direction of its own axis on application of pressure applied to the end of said slide, said slide being of substantially at elongated shape and having a longitudinal rib on one major face, said bolt casing having complementary shaped guiding openings in diametrically opposed sides thereof in which the rib on said slide engages, the longitudinal face of the slide having a depression therein opposed to the longitudinal face having the said VV-'shaped notch, a detentV engageable in said depression, an element displaceable within said casing in the direction of the axis of the bolt casing on which said detcnt'is mounted, and a compression springy between said :element and said bolt, said spring forming biasing means for retecting loutward extension of the bolt and r'esilie'ntrengagement Vof the detent against the one longitudinal` face of the slide.

The combination as claimed in claim l in which said latch -bolt has an'additional perpendicular projection thereon on the reduced thickness portion of the latch bolt, saidbolt casing vhaving internal guide grooves in which the Aprojection is slidingly engaged.

3. The combination as claimed in claim 2 wherein said additional projection has rollers thereon for Yengaging the `internal guide grooves of the latch bolt casing.

"4. In afasteningdevice-for doors arranged to t within a cylindrical 'recess formed inthe Vedge of the door and a circular'holejformed'transversely in the door and intersectingsaid recess,'the combination of a cylindrical boltV casingittable in said recess, a biased latch bolt retractably mounted'within said bolt casing, the end of said bolt within the casing is of kreduced thickness in the vertical direction, said casing having internal longitudinal grooves in which said bolt is slidable, a perpendicular projection 'on-substantially said end ofisaid bolt, saidprojection having two converging vfaces on the side of the projection converging in the direction of extension -of the bolt, a guided-actuatingslide extending transversely through the casing and through a space formed by the reduced end of the bolt and the projection, said actuating slide having a V-shaped notch in one longitudinal side of the slide formedby two converging faceswhich slidably engage the converging faces of said perpendicular projection for displacing-thebolt in the direction of its axis4 on displacement'of the slide in the-direction of its ownaxis on ap- Y plication of pressure applied to the end of said slide, a

transversely directed projection on said slide on the face thereof havingthe -V-shaped notch therein and on the-end thereof-'disposed remotely from the end of the slide to which pressure'is to be applied, said slide being ofrsubstantially flat elongatedfshape and having a longitudinal rib on one' major face, said bolt casing having complementary shaped guiding openings in diametrically opposed sides Vthereof'in which the rib on said slide engages, the longitudinal face of the slide having a depression thereon opposed to the longitudinal face having the 'said V-shapedlnotch,a detent engageable in said depression,` lan elementidisplaceable within said casing in the direction of theaxis of the bolt casing on which said detent is mounted, and a compression spring between said element and said bolt, said spring forming biasing means for effecting outward extension of the bolt and resilient engagement of the detent against the one longitudinal -face of the slide.

5. fIn-a fastening device fordoors arranged to nt within .ac vlindrical recess formed. in Vthe edge of the door and a circular vhole formedtransversely in the door and intersecting said recess, the combination of a cylindrical 'Colt casing ttablein said recess, a biased latch bolt retractably mounted within said bolt casing, the end of said boltwithin the casing is of reduced thickness in the vertical direction, a said teasing having internal longitudinal grooves in which said bolt is slidable, a perpendicular projection on substantially said end of said bolt, said projection having two converging faces on the side of the projection converging in the direction of extension of the bolt, a guided actuating slide extending transversely through the casing and through a space formed by the reduced end of the bolt and the projection, said actuating slide having a VV-shaped notchin one longitudinal side of the slide formed by two converging faces which slidably engage the converging faces of said perpendicular projection for displacing the bolt in the direction of its axis on displacement ofthe kslide in the direction of its own axis on application of pressure applied to the end of Vsaid slide, and'locking means associated with-said slide and comprising a wire-like strip rotatably mountedlengthwise in said slide yand having an outwardly projecting crank-like portion Yat van intermediate region for embracing and immovablysecuring said perpendicular projection on said bolt when rsaid strip is in one of two alternate positions, the perpendicular projection being free to permit movement or" the slide and the Vbolt in their respective guided directions when said stripis ini-,the other alternate position.

A6. In a fastening device `for ldoors arranged to tit within a cylindrical recess yformed-in the edge Vof the door and 4a Ycircular hole formed transversely 1in the door and intersecting said recess, the combination of a cylindrical bolt casing ittable in said recess, a biased latch bolt retractably mounted within said bolt casing, the end of said bolt Vwithin the casing being of reduced thickness in the vertical direction, said casing having internal longitudinal grooves in which said bolt is slidable, a lperpendicular projection on substantially said end of said bolt, said projection having two converging lfaces on the side of the projection converging in the direction of extension of therbolt, Va guided actuating slide extending transversely through the Vcasing kandthrough a space formed by the reduced end of the bolt and the projection, said 4actuating slide having a V-shape/d notch in one longitudinal side ofthe slide formed byytwo convergingfaces which slidably engage Ytheconverging faces of ,said `perpendicular projection-for displacing the ybolt in the direction Vof its axis on displacement of the slide in the `direction of its own axis on-application of pressure applied ,to the .end ofsaid slide, and `locking means associated V,with said slide and comprising ka wire-like Vstrip,rotatably mounted lengthwise in said slide and having an, outwardly. projecting crank-likeportion at an intermediate regionfor embracing and immovably securingsaid perpendicular proection on said bolt when said -stripisin one of twowalternate positions, the 4perpendicular projection being free .to permit movement of the slideand the boltin their respect-ive guided directionswvhen said strip Yis inthe other, alternate position, the longitudinal faceof the slide 4having a depression thereon opposed to the-longitudinal face having the said-.V-shaped notch, 4a detent engageable in-said depression, an element displaceable within said casing in the direction of the axis of the boit casing onwhich'said detent-is mounted, and a-compression spring between said element andsaidbolrt, said spring jforming biasing means for effecting outward extension of the bolt and resilient engagementof theA detent against the one .longitudinal` face of the-slide, and rotating means attached to said strip. for rotating it.

7. The combination as claimed inclaim 6 in-Which said latch bolt :has an additional perpendicular projection thereon4 on ythe Vreducedvthikness portion of the latch bolt, said'bolt casing having .internal guide grooves in :which theprojection is slidingly'engaged, said-,additional-projection vbeing `disposed .in spaced relationship behind, the perpendicularv projection. khaving gthe, converging faces.

8. The combination as claimed in claim 6 :wherein said :rotating means comprise knobs oneach endmofl said lock- Ving stripwhich knobs ,alsohforrnpnsh button means for axial displacement of the slide.

9. The combination as claimed in claim 6 wherein said rotating means comprise a tumbler lock the barrel of which is connected to said strip, whereby said locking strip is rotated to either of its alternate positions, a tubular part being mounted on the ends of the slide in which said barrel is mounted and forming push button means for axial displacement of the slide.

10. The combination as claimed in claim 6 wherein said rotating means comprise a rotatable knob mounted on one end of the strip and a tubular part having a rotary tumbler lock therein on the other end of the slide with the barrel lixed to the other end of the strip, said knob and lock also forming push button means for axial displacement of the slide.

11. The combination as claimed in claim 6 wherein the rotatable locking strip has a transversely extending cranklike portion on one end and said rotating means has a radial slot on the inwardly directed end thereof in which said crank-like portion is engaged.

12. The combination as claimed in claim 6 wherein the locking strip has a substantially hook-like tip portion on one end, said slide having two adjacent faces disposed substantially at right angles to one another either of which faces said portion resiliently presses against, the arrangement being such that on rotation of the locking strip from one alternate position to the other said hooklike tip portion is displaced against its resiliency from one face to the other adjacent face of the slide and over a corner formed between the said adjacent faces.

13. The combination as claimed in claim 12 wherein the said hook-like tip portion of the locking strip is disposed at an acute angle relative to the locking strip proper, said rotating means comprising an axially bored rotatable push button forming knob having a radial slot longitudinally thereof in which said tip portion is engaged for rotating the locking strip to the alternate position and for axial displacement of the actuating slide, said radial slot in the knob having an oblique wall terminating in a shoulder, said shoulder being engaged by the said hook-like tip portion for retaining said knob on an end of the actuating slide in limited rotational fashion.

14. The combination as claimed in claim 13 wherein the portion of the slide engaged by the knob is of reduced cross-sectional shape and receives the axially bored end of the knob thereon in rotatable fashion, said end of the knob having a recess therein with radial shoulders for engaging the slide adjacent the reduced end region for limiting the rotational movement of said knob to the extent of movement of said locking strip.

15. The combination as claimed in claim 6 wherein said locking strip has a crank arm on an end thereof and said rotating means comprises a tumbler lock having a spring biased barrel with a sector shaped notch therein in which said crank arm is engaged for permitting limited rotational movement of the locking strip relative to the total permissible rotational movement of the barrel.

16. The combination as claimed in claim 6 wherein the actuating slide is of substantially llat elongated shape and has a longitudinal groove in which said locking strip is received, a cover element secured to the said slide over said groove, said cover element and the slide both having corresponding V-shaped notches -in the longitudinal edges, the converging faces of such notch in the slide providing in spaced relationship to the apex thereof recesses permitting the movement of the outwardly projecting crank portion of the locking strip to the inoperative position.

l7. The combination as claimed in claim 6 and a slide casing comprising a tubular element for location in the transverse circular hole in the door and having corresponding diametrically opposed holes in which the latch bolt casing is received, said slide casing being of a length such that the ends of such transverse casing extend past the faces of the door, fixed door handles having annular ends in alignment with the casing ends and annular end push button forming members associated with the slide movably mounted in said annular ends.

18. The combination as claimed in claim 17 wherein the bores of the annular handle ends are tapered and widening in the direction of the door engaging sides of such annular ends.

19. The combination as claimed in claim 17 wherein door engaging regions of the bores of the annular handle ends have annular recesses therein for free engagement by the ends of the transverse casing.

20. The combination as claimed in claim 17 wherein the end regions of the transverse casing are screw threaded, and correspondingly threaded ferrules nonrotatably engaging the annular ends of the handles and into which said transverse casing is threaded.

21. The combination as claimed in claim 17 wherein the exterior of the latch bolt casing and the diametrically opposed holes of the transverse casing are of corresponding non-circular shape for correct location of the said casings when engaging one another.

22. The combination as claimed in claim 17 wherein the exterior face of the latch bolt casing and the diametrically opposed holes of the slide or traverse casing have corresponding projections for alignment of the said casings when they engage one another.

References Cited in the tile of this patent UNITED STATES PATENTS 491,793 Armstrong Feb. 14, 1893 508,267 Armstrong Nov. 7, 1893 660,061 MacNamara Oct. 16, 1900 980,630 Granger Jan. 3, 1911 1,898,975 Quarnstrom Feb. 21, 1933 2,383,574 Voight Aug. 28, 1945 2,450,449 Schlage Oct. 5, 1948