US2486268A

US2486268A - Tubular knob latch

Info

Publication number: US2486268A
Authority: US
Inventors: Erkkila Andrew
Original assignee: Independent Lock Co
Current assignee: Independent Lock Co
Priority date: 1946-02-07
Filing date: 1946-02-07
Publication date: 1949-10-25
Anticipated expiration: 1966-10-25

Description

Oct. 2,5, 1949. A ERKK|LA 2,486,268

TUBULAR xNoT LATCH Filed Feb. 7, 194e 4 sheets-sheet 1 INVENTOR 59 Andrew Efz'Z'a ATTORNEY Oct. 25, 1949.. A. ERKKILA 2,486,268..

. TUBULAR KNOT LATCH Filed Feb. 7, 1946 Q FE'EQ 54 5 4 Sheets-Sheet 2 u EPZ.

. INVENTOR Andrew Effi/wia ATTORNEY Oct. 25, 1949. A. ERKKILA v 2,486,268

TUBULAR KNO '11 LATCHy Filed Feb. '7, 1945 4 She'ets-Sheet 3 l INVENTOR Andrew'. 'Ef/*ziale BY ATToRNEY l l,

Oct. 25,'/19491 A. ERKKILA l TUBULAR KNOT LATCH 4 Sheets-Sheet 4 Filed Feb. 7, 1946 INVENTOR 'Andrew Ef'iz'zz BY Y Patented Oct. 25, 1949 Andrew Erkkila, Fitchburg, Mass.,

assignor to Independent Lock Company, Fitchburg, Mass., a corporation of Massachusetts Application February 7,

1946, Serial No. 646,019

18 Claims. (Cl. 292-169) This invention relates to a tubular knob latch; more particularly to vknob button control locks and latches.

It is an object of my invention to provide a lock including a spring projected latch bolt which is spindle knob operated and includes push button means on the knob for restraining the opposite knob from actuation to retract the latch bolt.

Still more particularly, it is an object of my invention to provide a latching device which is knob spindle operated, including push button means for dogging the latch bolt against spindle operation by an exterior knob spindle.

'Still more particularly, it is an object of my invention to provide a tubular latch characterized by one or more of the features involving compactness of assembly; rigidity of construction in employing a novel unitary spindle installation; push button operation of an interior knob spindle for dogging the latch bolt by exterior knob spindle operation; which is inertia-proof, i. e. the inertia of moving parts, as in swinging or slamming of the door, does not set the dogging means in operation; in which dogging means for the knob spindle may not be accidentally set into position characterized by resetting of the latch bolt clogging means when the latch bolt is retracted; the provision of a tubular latch having push button dogging features which are readily reset; the provision of a lock having bolt dogged by a spindle knob push button in which a unitary spindle may be employed.

It is a further object of my invention to provide a tubular latch casing construction which may be economically produced and assembled, yet which satises al1 the requirements of unfailing performance and rigidity of construction.

It is an object generally of my invention to provide al tubular latch which includes the features of dogging the latch bolt by spindle knob push button actuation and which is compact in -construction and readily installed.

To attain these objects and such further objects as may appear herein or be hereinafter pointed out, I make reference to the accompanying drawings, forming a part hereof, in which Figure 1 is a perspective view of my installation, shown in connection with a fragmentary portion of a door;

Figure 2 is a section taken on the line 2 2 of Figure 1;

Figure 3 is a section taken on the line 3 3 of Figure 2, with the latch bolt in the projected position;

Figure 4 is a view similar to Figure 3, with the a spring projected latch latch bolt and roll the latch bolt;

Figure 5 is a section taken on the line 5 5 of Figure 2;

Figure 6 is a section taken on the line 6 6 of Figure 2; 'i

Figure 7 is an exploded perspective view of my latch bolt assembly shown in Figure 1;

Figure 8 is a fragmentary perspective view of the latch bolt shank heel;

Figure 9 is a section taken on the line 9 9 of Figure 7;

Figure 10 is a section taken on the line IIJ I0 of Figure 2,'

Figure 11 is a view corresponding to Figure 9, of another embodiment of my invention with the knob push button in the depressed position;

Figure I2 is a fragmentary section taken on the line |2 I2 of Figure 11.

Figure 13 is a longitudinal sectional another embodiment of my invention;

Figure 14 is a perspective view of a casing in accordance with still another embodiment of my invention;

Figure 15 is a perspective view of a detail;v

Figure 16 is a perspective View of the dogging lever in accordance with another embodiment of my invention;

Figure 17 is a fragmentary perspective View of still another embodiment of my invention.

Making reference to the drawings, I show a casing' I Il, of generally tubular-cross-section, arranged to be fitted within a boring II of a door The casing comprises a section I3, which includes a rectangular portion I4, having a locking slot I 5 to receive the tongue I6 of the channel back mechanism retracting View of Il formed on the inner lamination I8 of the end plate I9. In this construction,l the end plate I9 may be of brass and the inner lamination I8 4of iron. Screw holes 2U to receive the attaching gure 1) are dened by material spun from the complemental drill hole 2l in the lamination I8 (Figure 3) and headed thereover to unite plate I9 and lamination I8.

Thechannel I'I 22, which bolt 22 and the heel 25. l

Rearwardly of the casing I 3,' a spindle hub yaperture 2l is formed by spinning the :flange 28 body of the plate I9, entering a therefrom inwardly directed, to form a bearing, and an inner seat 29 for the rollback hub hereinafter described.

Guide fingers 38-30 are positioned forwardly of the flange 28 and serve as an abutment for the.

and oriflced at heretofore dedisk 3|, formed with

pivots

32, 32 33 to receive the rollback hub scribed.

The dogging lever 34 is oriced at 35, at its medial portion. This orifice corresponds to the oriiice 28 to receive the rollback hub hereafter to be described.

The dogging lever 34 has its

side flanges

36, 36 arranged to rock on the pivots 32 and is formed at its forward portion with a tongue 31, guided between the

guides

38, 38. The extremity of the tongue 31 is formed with a camming edge 38, and may include spaced

ngers

39, 39 outlining a depressed lug 48. A lug 4| is struck up from the tongue 31, for purposes which will appear as this description proceeds.

The rearmost portion of the dogging lever 34 includes an extension arm 412, bent laterally into a branch 43, carrying a camming edge 44. The outside spindle rollback hub 45 is thereupon positioned to be journaled in the bearing portion 28, centering the dogging lever 34. The flange 46 carries the rollback camming

arms

41, 41 between which there is formed a slotl 48, arranged to receive the lug 4| of the dogging lever.

With this assembly there is then provided the retractor link- 49 comprising spaced

branches

58, 50, having guides on their inner edges 5| arranged to span the extension 52 of the hub 45.

Spaced pins

53, 53 extend for a length to lie in the path of the rollback cams through each face -of the

branches

58, 58. The link 49 is formed with extensions 54, 54 comprising bearing shoes entering into the

slides

55, 55, at the edge of the casing section I3. The

link branches

58, 58 are headed in the plate 56, formed with a bearing edge 51 for engaging the

guides

58, 58 by inwardly indenting the metal of the casing section I3 to form longitudinally directed, embossed protuberances.

The plate 56 is formed with a keyhole slot 59, having a restricted entrance portion 68 which may span the slot or neck 6| of the shank 24. By spanning the neck 6| between the rearmost end of the spring 26, upon its compression the plate 56 may be made to span the cylindrical part of the shank 24 for slidable engagement thereupon. Upon the plate 56 passingthrough the neck 6|, and a quarter turn being made expansion of the spring 26 will normally direct to the limit, to engage the heel 25 as the limiting position, yet permitting independent movement of the latch bolt head 22 `with respect to the link 49.

Under these conditions, the inside rollback and hub assembly 62 may now be placed in position. This latter hub has a seat 63 (see Figure 2) providing a bearing which may be journaled on the extension 52 of the hub 45. The hub 45 is formed with a keying orifice 64 of square cross-section, to receive in keying engagement the knob spindle hereinafter to be described. The hub 62, however, is oriiiced at 65 to receive and square spindle for free rotation in relation thereto.

The hub 62 is formed with a rollback cam 66, having

shoulders

61, 61 which may fall behind the

pins

53, 53 on the upper face of the link 49. The assembly, in this condition, may have applied to it the casing section 68. This is provided with inthe latch bolt 22 encircle they dentations 58, 58 as described in connection with the casing section I3, cooperating with the indentations 58 on the other casing to form a guide for the plate 56.

The forward end of the square channel I1 is provided with an offset finger 69, cooperating with the slot 16 in the forward edge of the casing section 68, to maintain 68 in alignment at the forward end, the edge 1I abutting the lamination |8 previously described.

The casing section 68 is likewise slotted with the slot for the shoes 54, 54 on the link 58.

A boring 12, with an inwardly spun flange 13 provides a bearing for the extension 14', to maintain the hub 62 journalled therein for rotation. In this position,

coiled springs

14, 14 are mounted upon the

lugs

15, 15 at the rear of the link 49 and the spacer 16 xed thereover, to have the

lugs

11, 11 pressed therefrom nest over the opposite free ends of the coiled spring 14. A cap 18 fits over the

sleeve sections

19, 19 of the casing I3 and 68, respectively, to hold the casing sections together. An offset friction finger 88 is cut out from the side wall of the cap 18, to fall into the seat 8| in the rear sleeve portion 19 and the casing section I3, thus preventing displacement of the cap but being readily removable upon partial rotation to move the finger 88 from its position entering the slot 8|. A

It will be observed that the dogging lever4 34 has its camming end 44 accessible through the orifice 82, having an overhanging lip 83 on the casing section 68.

The casing I3 is provided with a boring 84, making the arm 42 accessible for purposes which will appear as this description proceeds.

With a casing assembled as described, I provide an interior knob assembly 85 which` comprises a square knob spindle 86, which is directed through a sleeve 81 in a boring 88, within which the spindle may freely rotate. A cross pin 89 passing transversely through the end 90 of the spindle bears against the shoulder 9| of the sleeve 81, permitting rotation but otherwise holding the spindle against displacement from the sleeve 81. The sleeve 81 is formed with

lugs

92, 92, complemental to the

slots

93, 93 of the hub 62 for rotation of the hub 62 in a manner which will hereinafter appear.

A knob 94 is axially orificed at 95 to receive a push button 96 comprising a cup shaped member to seat within the same one end of a coiled spring 91. The opposite end of the coil 91 is housed over the head 88 of the spindle 86. The push button 96 carries riveted thereto an elongated normally laterally flexed spring iinger 98, extending through the tubular shank 99 in the knob and entering into a slot |88, formed in the neck |8| of the sleeve 81.

The shank 99 abuts a shoulder |82 on the sleeve 81, to hold the knob and sleeve 81 in the assembled limiting position. A set-screw |83 holds the sleeve and knob in assembled position. The free end of the nger 98 is maintained in an upward tilting position by the leaf spring |84, anchored in the slot |88 and bearing against the latching nose |85. A shoulder |66 on the shank oi the nose |85 restrains the escape of the push button 98 by engagement of the said shoulder |86 with the rim of the shank 99. The push button 96 and its finger 98 are inwardly slidable, to direct the nose |85 into engagement with the camming end 44 of the dogging lever 84, entering through the orifice 82.

The latching nose is provided with a calnthe casing sections I3 and I ming edge 01 and a locking lip H18. The action in depressing the push button serves first to de` press the latching nose H15 past the lug 83 of the casing, to become depressed in the `slot |00, and thereafter to be held in the depressed latched position by engagement of the lip 108 with the lug 83. This thereby latches the push button in the depressed position against the action of thev spring Sl to retract the arm 98.

For assembly of the latch in position, I first slip an inside escutcheon IGS over the shank 3S of the inside knob and then project the spindie 86 through the huh S2 and into keying engagement with the square orifice 84 of the hub 45, until the end oi the spindle passes through the boring Htl on the outside face In this position, the end of the spindle HI is lcutcheon tional design to receive the square spindle Ill in. keying engagement.

The operation of the dogging, lever within the tubular latch will now be described.

Normally, the latch bolt 22 is spring projected and vis independently'depressible with its shank against the tension of the spring 26, as when the door is closed and the latch bolt strikes the and thereafter as it enters the usual strike plate orifice (not shown) the latch bolt is again in the projected position.

In the normal position of the dogging memshown in inside knob, upon engaging the rollback 62, may retract the latch bolt 22 by engagement of the rollback Gli with the pins 53 on the front face of the link 5t. Thus, clockwise or counter-clockwise rotation of the inside knob will withdraw the latch bolt. Operation of the outside knob obtained in this outside knob H to prevent retraction of the latch bolt, the push button 96 is depressed. This action directs the latehing nose l-05 through the orice 82, where it engages the camming portion 44 and somewhat slidingly tilts the camming lever aboutthe pivots 32. This action in the normally oriented position of the rollback 45 serves to direct the lug 4l into the slot 48.

The tongue 3l, being positioned against rotation between the guides 30, thereby effectively dogs the rollback 45 against rotation. Detent means may be employed to maintain the dogging lever in the tripped position.

In the embodiment 7, a detent HS comprising a spring loaded ball inwardly projected position of the nose |05 likewise maintains the tripping lever in the dogged position.

As an occupant rotates the inside knob 94, the action is as follows: The inside rollback 66 of the hub 62 being free to rotate on the dotted line in Figure 2, the

mentof the link 49 draws.

purposes the escutcheon H5 is provided with an aperture 84a., aligned opposite the aperture 84 of the casing, whereby some instrument or a key operated member may enter the casing to trip the clogging lever 34, from the position shown in full lines in Figure 2, to that shown in dotted lines in Figure 2. Likewise, should accidental operation of the push button S5 occur t0. move the saine to the clogging position with the door ajar the heel 25 into engagement with the camming portion 4Q of the tongue 3l. This action accordingly resets the clogging lever 34, whereby outside knob rotation may be eliected.

While I have described iny connection with the embodiment of Figures 1 to 10 a ging element actuating a spring 91, I may oper-n ate the dogging trigger by a frictionally urged and positively returned camming nose without spring action in either movemen In Figure 1l, a knob sleeve 81 is employed, as

. iillld warped outwardly engages the shank 99a of the knob, to frictionally hold the push button and its actuating assembly in eitherthe dogging position or re-set position.

In still another embodiment of my invention, as illustratedy in Figure 13, I may provide greater The clogging lever in this particular case exadjacent the casing ends 19a, aty which point it contacts a curved leaf detent spring H605, riveted push button dogon the capping plate 16a. The plate 16a has tongues 11a entering into complemental orices in the front and rear casing, acting as abutments for the springs 14a. Seatsl 11b retain the springs 14a against lateral displacement.

The fold of the branch 42a at its extreme point is provided with an embossing, bead-like construction I lla, cooperating with the detent spring lla to retain the dogging lever tripped in the dogged or undogged position.

The casing in this particular case is closed by a cap 18a formed with bayonet slots 80a engaging the extruded bosses Bla. In this embodiment a separate pivot plate need not be employed but the sheet metal casing has embossed thereon the protuberances 32a about which the dogging lever tilts or rocks.

Another embodiment of my invention is illustrated in Figure 14 wherein one half of the casing |31) is shown. Longitudinal guides 58, 58 are y pressed inwardly or embossed in the sheet metal of the casing and terminate in embossings 30h, 30h, acting as abutments for the disks 31h carrying the pivots 32h as in the prior embodiment. In all other respects, the casing segment l3b may be formed as in the prior embodiments.

In accordance with this embodiment, a detent spring lltb of general L-shape has one branch attached to the sleeve sections 19D, serving to bear against a dogging trigger, as illustrated in Figures 13 and 16, cooperating with the bead Illa, thereof to restrain the lever 34a in either of the tripped positions, i. e. dogging or freeing the rollback hub 45a.

In all other respects, the function of the parts is in accordance with the prior embodiments illustrated in Figures 1 to l0.

In Figure 17 there is exemplified a form of latch bolt operation whereby the latch bolt is positively dogged, as well as to dog the outside knob and the spindle controlled thereby. Here the latch bolt shank 24o is provided with a heel portion 25e of rectangular contour, exposing an abutting end 25d.

In this embodiment, the dogging lever 34h is actuated as in the prior embodiments. However, the branch 31h terminates in a dogging finger 39h. This dogging finger is extended so that normally it lies outside of the path of movement of the shank heel 25e as well as the plate 56. When the dogging lever 34h is tripped into dogging position, the dogging iinger 39h lies in the path of the heel 25e to engage the abutting surface 25d. Under these circumstances, the possibility of jimmying or prying of the latch bolt carried by the shank 24e to-the retracted position is minimized, although the automatic re-setting feature heretofore described is not obtained in this form of construction.

The feature just described indicates the versatility of my construction to obtain a tubular latch which may be employed to atch communicating doors, such as bathroom doors, as well as for exterior entrance doors which may require key operation for the exterior knob.

It will be observed that I have described a latch bolt assembly which may be made economically and by simple assembly means, satisfying all the requirements of rigidity of con'- struction and positiveness of operation for its intended purpose, all combined with a push button control located in the knob and employing, in its preferred form, a one-piece spindle, assuring simplicity of installation and long life in operation.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is:

1. In a spring projected latch, a retractor, inside and outside hubs in aligned relationship, each independently operable upon said retractor, a single spindle for said hubs, the outside hub being keyed to said spindle, the inside hub having keying engagement with a knob journaled on said spindle.

2. In a spring projected latch, an inside and an outside hub operatively connected to retract the latch, a single spindle for said hubs, the outside hub being keyed to said spindle, the inside hub having keying engagement with a knob journaled on said spindle, means for dogging the outside hub and operating means for said dogging means on said knob journaled on said spindle.

3. In a spring projected latch, means for re- .tracting said latch comprising aligned inside and outside hubs, each independently operable to retract said latch, a single spindle forsaid hubs, means for keying the outside hub to said spindle, means for journaling the inside knob on said spindle, means for operatively keying said inside knob to said inside hub and dogging means for said outside hub operable on said inside knob, said dogging means being movable to the released position upon movement of said inside hub.

4. In a spring projected latch, a casing, aligned inside and outside hubs journaled in said casing, a retractor operable by said hubs for said latch, a spindle keyed to said outside hub, a knob journaled on said spindle, having means keying the same to said inside hub, dogging means for said outside hub and means on said retractor for diS- engaging said dogging means upon actuation by said inside, hub.

5. In a lock having a spring projected latch bolt, a tubular casing therefor, aligned inside and outside hubs independently operable to retract the latch bolt, spindle means for actuating said hubs, a dogging lever spanning said hubs pivoted in said casing, a tongue on said dogging lever for engaging the outside hub, means on said inside hub for engaging an inside knob for actuation, said knob carrying means for camming said dogging lever to dogging position.

6. In a lock having a spring projected latch bolt encased within a substantially tubular casing, aligned inside and outside hubs independently operable, journaled in said casing, each hub having camming means to retract the latch bolt, keying means on said outside hub to receive a spindle for outside knob actuation of said hub, means on said spindle cooperating with said inside hub for rotationally mounting said spindle with respect to said inside hub, a dogging lever spanning said hubs and tiltable with respect to the same, a dogging tongue on said dogging lever for engaging said outside hub and camming means accessible to said inside knob and means carried thereby for tripping said dogging lever to the dogging position.

7. In a lock having a spring projected latch bolt encased within a substantially tubular casing, aligned inside and outside hubs independently operable, journaled in said casing, each hub having camming means to retract the latch bolt, keying means on said outside hub to receive a spindle for outside knob actuation of said hub, means on said spindle cooperating with said inside hub for rotationally mounting said spindle with respect to said inside hub, a, dogging lever spanning said hubs and tiltable with respect to the same, a dogging tongue on said dogging lever for engaging said outside hub and camming means accessible to said inside knob and a plunger element carried by said knob for tripping said dogging lever to the dogging position, said plunger being slidably mounted within said inside knob and a push button axially disposed on said knob for the same.

8. In a lock having a spring projected latch bolt encased within a substantially tubular casing, the combination comprising aligned inside and outside hubs -journaled in the casing and independently operable, guides in the casing, a retractor slidably mounted and bearing on said guides, including spring means to urge the same to a normal position, a coupling between said retractor and said latch bolt whereby said latch bolt is depressible independently of said retractor,. means on said outside hub to receive the spindle in keying relationship, a dogging lever spanning said hub and tiltable with respect to the same, having a dogging tongue, an inside knob having a shank journaled on said spindle including keying means for said inside hub, push button means having an extension finger for tripping said dogging lever to the dogging position.

9. In a lock in accordance with claim 8 wherein said extension :linger is provided with means to hold the same in the tripped position of said dogging lever.

10. In a lock in accordance with claim 8 wherein said push button is spring retracted and the extension nger connected therewith includes latching means to hold said push button in the depressed position.

ll. In a lock in accordance with claim 8 wherein said extension nger is carried by an axially depressed spring retracted push button and said casing includes a latching lip to hold said linger in the depressed position whereby, upon rotation of said inside knob, the latching linger is released.

12. In a lock having a substantially tubular casing the combination comprising a spring projected latch bolt protruding through one end thereof, the other end whereof includes a headed shank operatively connected to a retractor, slidable on said shank in one direction for independent depression of said latch bolt, inside and outside hubs journaled in the casing, including camming iianges connected to said retractor, a dogsaid hubs, tiltable trans- 14. In a lock in accordance with claim 12,

' wherein said branch of said dogging lever includes a dogging finger extended to lie in the path of the shank when the dogging lever is in the dogging position, whereby also to dog the latch bolt.

15. In a lock having a substantially tubular casing, the combination comprising a spring projected latch bolt protruding through one end thereof, a retractor, inside and outside hubs in- 'cluding camming means operatively connected to said retractor for independently actuating said retractor, a spindle for said outside hub extending through said inside hub, a dogging lever for said outside hub tiltable transversely of said hubs and spanning the same, said lever having an exten l sion arm accessible through the casing for actuation, an actuating nger carried by an inside knob the spindle for said hubs, said inside operatively connected to said inside hub whereby retraction of the latch bolt is eiected to restore said dogging means to the normal position upon rotation of the inside knob to withdraw said latch bolt.

16. In a tubular lock having a spring projected latch bolt protruding through one opening of the casing and independently operable inside and outside retractor hubs including push button means on the inside knob for the inside hub, the

combination therewith of a dogging lever spanning said hubs including extension arms, one of which dogs the outside hub and the other of which includes camming means for tilting the same to the dogging position.

17. In a lock in accordance with claim 16 wherein said dogging lever includes a camming edge lying in the path of the latch bolt whereby independent depression of said latch bolt will trip the dogging lever to the undogged position.

18. A lock in accordance with claim 16 wherein lever includes a withdrawal trip the dogging lever to the undogged position.

ANDREW ERKKILA. REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Mar. 14, 1944 Certicate of Correction Patent No. 2,486,268 October 25, 1949 ANDREW ERKKILA It is hereby certied that errors appear in the above numbered patent requiring correction as follows:

In the heading to the drawings, Sheets 1 to 4 inclusive, line 2, for TUBULAR KNOT LATCH read TUB ULAR KNOB LATCH;

and that the said Letters Patent should be read with these corrections therein th at the same may conform to the record of the case in the Patent Oflce.

Signed and sealed this 11th day of April, A. D. 1950.

THOMAS F. MURPHY,

Assistant Commissioner of Patents.