US2603516A - Door lock - Google Patents

Description

J. H. ROETHEL July 15, 1952 DOOR LOCK Filed March 28, 1947 3 Sheets-Sheet 1 INVENTOR. J/zrz x1. Fagiiel y 15, 1952 J. H. ROETHEL 2,603,516

DOOR LOCK Filed March 28, 1947 :s Sheets-Sheet 2 INVENTOR.

4/ v i 72%); Faeiel.

BY fi w W Patented July 15, 1952 DOOR LOCK Johnli. Roethel, Detroit, Mich., assignor to Roethel Engineering Corporation,

Detroit,

Mich., a corporation of Michigan Application March 28, 1947, Serial No. 737,865

Claims.

This invention relates to latch mechanism for the swinging doors of various structures. Although especially adapted to be used in connection with the doors of vehicle bodies, such as automobile bodies, the present invention may be applied to various other uses.

An object of the invention isto provide a door latch which combines in relatively simple and compact form such desirable features as quietness of operation when closing the door, simplicity and compactness in construction, operational eihciency and economy in manufacture.

Another object of the invention is to provide an improved door latch embodying a latch bolt extending longitudinally at the free edge of the door and shiftable bodily in a generally vertical or up and down direction bya rotative motion both when closing and opening the door, means being provided for locking or holding the bolt preferably in a plurality of positions and additional means of an improved, relatively simple and efficient character being provided for releasing the bolt locking means selectively from the inside and outside of the door to permit the door to be opened.

A further object of the invention is to provide an improved latch device having a bolt mounted eccentrically upon a rotatable member and movable up and down bodily during operation, said member being locked or held in one or more bolt locking positions by means of a detent or dog mounted and controlled in improved manner.

Another object of the invention is to provide a latch device in which the rotatable bolt or latch carrying member is positively held or restrained in various-latched positions of the door by a swinging toothed lever or locking'member controlled in its movement by the bolt carrying member and in turn positively locked in various positions by a detent or dog capable of being readily and easily released manually from the outside or in side of the door.

Further objects of the invention are to provide improved remote control means for releasingthe door latch from the inside of the door and improved manually operable means accessible at the inside oi the door for blocking or restraining release of the latch device when the door is in closed position.

Still another object of the invention is to provide a latch device having a rotatable latch or bolt carrying member, a swinging locking member controlled thereby to swing oppositely thereto and a. detent or dog cooperable with said locking member, said detent being releasable through 2 the medium of a swinging release. lever, and the bolt carrying member, detent and. release. lever being controlled or influenced by a commonspri-ng means.

A further object of the invention. is to provide improved means for blocking or restraining release of the bolt or latch device. such-means being manually operable andincluding an element movable into and out. of blocking engagement with the swinging locking. member which in turn is so connected to the bolt carrying member as to be movable only in unison therewith.

Gther objects. of this. invention. will appear in thefollowing description and appended claims, reference being had to the accompanyin drawings forming a part of this: specification wherein like reference characters designate. corresponding parts in the several views.

Fig. 1 is a. fragmentary side elevation. of a portion of an automobile body provided with a swing.- ing front door upon which. a. latch. device made in accordance with the present. invention is installed.

Fig. 2 is an enlarged vertical section taken substantially through lines 2-2 of Fig. 1,. the latch device in this view being shown in its final looking position.

Fig. 3 is a view in part. similar to. Fig. 2, illustrating the latch device in unlatched position- Fig. 4 is a section taken. substantially through lines 4-4 of Fig. 2 looking in the direction. of the arrows.

' Fig. 5 is a section taken substantially through lines 5--5 of Fig. 2 looking in the direction of the arrows.

Fig. 6 is a section taken substantially through lines 6-6 of Fig. 2 looking in the direction of the arrows.

- Fig. 7' is a view in part similar to Fig. 2, illustrating the latch device in safety latchin position.

Fig. 8 is a fragmentary side elevation taken substantially from lines 88 of Fig. 2 looking in the direction of the arrows.

Fig. 9' is a section on a reduced scale taken sub stantially through lines 99 of Fig- 8ilooking. in the direction of the arrows.

Before explaining in detail the present invention. it is. to be understood that the invention is not limited in its application to the details of constructionand arrangement of parts illustrated in the accompanying drawings,. sincethe invention is capable. of other embodiments and of being practiced or carried. out in various ways. Also it is to be understood that the phraseology or pivotally mounted on the case plate.

3 terminology employed herein is for the purpose of description and not of limitation.

In the drawings there is illustrated, by way of example, one embodiment of the present invention as applied to a door and door frame structure of an automobile body. As illustrated in Fig. l, the automobile body, designated generally at A, is provided with a front door B which is hinged at its front edge so as to swing against a door post or body pillar in accordance with conventional practice. metal door panel 20 and an inner metal door panel 2!, see Fig. 2. The panel 2| terminates in a transverse jamb edge or portion 22 facing the fixed jamb face or edge 23 (Fig. 8) of the door frame post or body pillar.

Adapted to be secured, as by means of screws, to the inner side of the jamb portion 22 of the door is a case plate 24 having a flange Maengaging the inner door panel 2|. Mounted on the case plate 24 is a bolt carrying plate or member 25 which is rotatable upon a pivot or stud 25 in the form of a shoulder rivet secured to the case plate, see Fig. 6. Rigidly fastened to the bolt plate 25 at a point spaced from the pivotal axis 26 thereof is a longitudinally extending cylindrical latch bolt 21. This bolt projects outwardly in a longitudinal horizontal direction through an arcuate'slot 28 in the case plate and also through a similar and registering arcuate slot in the J'amb 22 of the door, these slots being covered by the bolt plate 25 when the door is open, as illustrated in Fig. 3. A shoulder rivet or stud 29 is rigidly fastened to the case plate at a point above the bolt 21. The upper end of a toothed locking bar,

or plate 30 is pivotally mounted or fulcrumed upon a cylindrical portion of the stud 29 so as to swing back and forth between the positions shown in Figs. 2 and 3 during opening or closing movement of the door. The swinging motion of the toothed locking bar or ratchet member 30 is controlled by the bolt plate 25, this being accomplished in the present instance through the medium of a pin and cam slot connection, although it will be understood that other mechanical means may be utilized for swinging the locking bar 39 from the bolt plate 25. A simple form of connection between the bolt plate 25 and the locking bar 30 may take the form of an integral pin or stud extension 3! of the bolt having a sliding fit within an arcuate cam slot 32 in the locking bar 30.

The locking member so is elongated to extend a predetermined distance below the pivot 25 of the bolt plate 25 and is formed at its lower end with a widened portion 30a terminating in an edge preferably formed with an arcuate portion 30b having its center of curvature substantially at the pivot 29. The lower edge of the locking bar is cut to provide two spaced teeth or inclined detent or dog engaging abutments 33 and 34 with an intervening smooth edge portion 35 extending between-the abutments. The tooth or abutment 33 forms the safety locking step andrthe tooth or abutment 34 forms the final locking step of the latch device.

Cooperating with the locking bar 38 is a dog, detent or pawl 36 having a bearing hole to receive a shoulder rivet 37 attached to the case plate 24 and through the medium of which the detent is The dog .or detent 36 is provided with an arm 35a terminating at its upper end in a dog=or detent portion 38 shaped to engage either one of the abutments 33 and 34 when the door is closed.

The door comprises an outer The detent or dog 36 is adapted to be released or disengaged from the toothed locking bar by means of a detent actuating or release lever 39. This lever is in the form of a single stamping formed with reinforcing fianging around its edges. The lever has an embossed portion 39a at its lower end engageable with the case plate, this embossed portion of the release lever being pivoted to the case plate at 10- by means of a shoulder rivet. The lever 39 carries at its lower end a projecting pin or stud 4!, preferably in the form of a shoulder rivet, and this pin or stud has an annular portion positioned between the pivot 40 of the lever and the pivot 31 of the detent 36 and lying withina notch 42 in the detent so as to couple the lever and detent together for simultaneous actuation. The stud 4i and notch 42 provide an articulated connection between the release lever and detent thereby permitting the detent to be swung in one direction'when the release lever is swung in the opposite direction. Thus, when the detent 36 is in engagement with either of the abutments 33 and 34, as shown in Figs. 2 and '7,

it will be apparent that upon swinging the release 3 lever 39 counterclockwiseas viewed in these figures, the pin or stud 4| will be depressed thereby rocking the detent and withdrawing the detent portion 38 from engagement with the abutments.

The bolt carrying plate 25 and the detent release lever 39 are controlled by means of a common spring 43 which functions to urge the bolt carrying plate constantly toward bolt unlatching position and to urge the detent actuating .lever 39 constantly into retracted or inactive position, as shown in Figs, 2 andfl. The spring 43 has one or more intermediate coils wound around a cylindrical portion of a stud M riveted to the case plate 24, the spring-beingheld in position by the head of the stud. The spring has an 6X1 tension or arm 53a engageable at its lower end with the outer edge of the bolt plate 25, the latter being offset to provide a lip 25a. overlying the lower end of the spring for the purpose of holding it in position. The spring 43 also has a somewhat longer extension or arm 431) which engages a tongue 45 lanced out of the metal of the lever 39 adjacent the upper end thereof. From this construction it will be seen that the spring extension 43a constantly exerts an inward force on the bolt plate 25 urging it towards its unlatching position shown in Fig 3. Also the spring extension @312 exerts an outward force at 45 against the detent release lever tending to urge it constantly toward its fully retracted po sition. Since the spring extension 4% is longer than the sprin extension 53a, the effort exerted against the release lever 39 will be less than the effort exerted against the bolt plate.

The detent release lever 39 has a widened flange portion 39b engageable by a plunger 46 which may be shifted inwardly to swing the lever by any suitable manually operable means on the outside of the door such, for example, as pullout handle 41 or by any other preferred means such as a push button carried by the outside door any suitable manner from the inside of the door remote from the case plate such as by means of a door handle or push button device. This remote control mechanism comprisesa bell crank or two-arm lever 48 pivoted at 4.9 through the medium of a shoulder rivet to the case plate flange 24a. The bell crank 48 has a longitudinally extending arm 48a overlying at its outer end a lateral flange 390 formed on an extension 39d of the detent release lever. The bell crank '48 also has a depending lever arm 4811 connected and the door handle to their normal positions after the inner door handle has been released. By turning the inner door handle to rock the lever 54 the link 52 will be shifted to the left in Fig. 8, thus rocking the bell crank 48 and depressing the lever arm 48a which by engagement with the-flanged end 390 of the detent release lever 39 will swing the latter in a counterclockwise direction and-thereby cause the -pin or stud 4| to swing the detent 36 downwardly in a clockwise-direction until the dog or tooth portion 38 thereof clears and is free of either the abutment 33 or the abutment 34 on the locking lever 30. When this occurs the bolt plate 25 will be free to swing in a counterclockwise direction toward bolt unlatching position, and this action will swing the locking lever 39 in the opposite direction, through the medium of the pin and cam slot connection 3|, 32, from either of the positions shown in Figs. 2 and 7 to the position shown in Fig. 3.

In accordance with the present embodiment means is provided for blocking the locking lever 30 and, hence, the bolt plate 25 against release when the detent release lever 39 is actuated either by the plunger 46 or the remote controlled arm 48a of the bell crank 48. This additional locking means comprises a bell crank or two-arm blocking lever 59 pivoted at 60 to the case plate flange 24a, see Fig. 8. I The blocking lever 59 has a depending arm 59a stamped to form an intermediate embossed portion or blocking projection 59b which, as shown in Figs. 2, 4 and 8, is arranged in such manner as to be shifted into and out of blocking position with respect to an inner edge portion 360 of the locking lever 30. The blocking lever 59 has a longitudinally extending arm 59c pivotally connected at its terminal end to a vertically extending rod or plunger 6 I. This rod projects through the garnish molding at the lower edge of the Window opening and carries at its upper end a knob or button 62 (Fig. l) which is accessible in conventional manner at the inner side of the window glass of the door. When the knob or button 62 is pulled upwardly the rod 6| will swing the lever 59 about its pivot 60 thereby shifting the blocking projection 59b out of blocking relation to the edge portion 300 of the locking lever 30, as shown in full lines in Figs. 4 and 8. When, however, the knob or button as well as the plunger 6| is pushed down from the position shown in Fig. 8 the lever 59 will be rocked about its pivot thereby shifting the blocking projection 59b to the dotted line position shown in Fig. 4into blocking or abutting relation to the edge of the locking lever 30. When this occurs the lever 30 will be blocked against release or swinging movement in a clockwise direction. When the locking lever 30 is thus blocked or restrained by the blocking projection 5% it will be apparent that the bolt carrying plate 25 will also be restrained against movement into unlatching position due to the interlocking pin and slot connection 3|, 32. However, it will be apparent that the detent release lever 39 will not be blocked or restrained when the locking lever 30 is blocked or restrained. Hence, even though the bolt under these conditions cannot move to unlatched position, the locking lever 39 may still be freely actuated by either the plunger 46 from the outside of the door or by the lever arm 48a from the inside of the door. From this construction it is important to note, therefore, that the release lever 39 and the detent 36 may be freely actuated when the locking lever 30 and bolt plate 25 are restrained by the blocking projection 59b without permitting the door to be unlatched. The blocking projection 59b is preferably embossed into V-shape so as to provide line contact with the edge 300 of the'locking lever, thus'reducing to a minimum the frictional resistance to movement of the blocking projection out of blocking relation to the lockin lever 30.

The inside blocking lever 59 may also be actuated, where desired, by means of a key controlled device from the outside of the door, such device being ordinarily incorporated in one or both of the front door locks but usually omitted in connection with the rear door locks of an automobile. Where a key controlled device is used the arm 59a of the bell crank 59 may have a depending extension 590 provided with a vertical slot 63 within which is slidable a pin 64a attached to the upper end of a crank arm 6.4 pivoted at its lower'end to the case plate, the lever being provided with a square opening or socketito receive a key-actuated shaft 65. This. shaft is connected to the cylinder mechanism of any conventional lock having the usual key control. By turning the key in the lock in the outside of the door the crank arm 64 may be swung to rock the lever 59 and shift the blocking projection 59b into and out of blocking position in the same manner as is accomplished by shifting vertically the It will be noted that the blocking lever 59 may be actuated to shift. the blocking projection 5911 into blocking relation to the locking lever 30 in only one position of the latter, namely, when the door is fully closed and the detent or dog 36 is in engagement with the final locking step or abutment 34 as shown in Fig. 2. In this final looking position of the latch device the locking lever 30 will have been swung to the right in Fig. 2 a sufiicient distance to cause the edge 30c thereof to clear the blocking projection 59b and, hence, permit the latter to be shifted into blocking position. When the latch device is in unlatched condition as shown in Fig. 3 or in safety locking position as shown in Fig. 7, the locking lever 30 will be positioned so as toprevent the locking projection 5917 from being shifted into blocking or restraining relation thereto. Thus, the door must be fully closed and latched before the blocking lever 59 may be swung into blocking position either by means of the rod 6| or the key controlled crank arm 64.

It will be seen that the latch bolt 21 is. movable between unlatching and latching positionsin an arcuate'path, as defined by the arcuateslot 218; The bolt isactuated when the door is'closed by 1means of aistriker devicewhich' is rigidly mountedon the iamb face, 23 of the body pillar or fixed upright member'of the door frame; In the present instance the striker device comprises a stamped metal piece 66 having opposed lateral flanges positioned against the face of the jamb 23 and also having anintermediate outwardly embossed portion formed with an inwardly and upwardly extending slot or guideway 61 which has straight upper and lower parallel sides sufficiently wide to afiord ample bearing engagement with the bolt 21; The striker is secured to' the pillar 'or, door frame by screws 68. The width of the guideway 61 approximates closely the diameter of the bolt 21 and the lower side 61b of theguideway projects a substantial distance below the lower end of the upper side 61a of the guideway so as to permitthe bolt to pass beneath the latter, as shown at a in Fig.9,-'into engagement with the inclined side 61b of the guideway when closing the door., As the] door continues its closing movement after initial contact of the bolt with the inclined'siderfilb the bolt rides up on the side wall 61b and assumes successive latched positions within the guideway 61 such as shown at b and c in Fig. 9, position b representing the safety latching position and position representing the final latching position of the bolt. I

In the present embodiment I provide yieldable wedging means cooperable with the striker casing 38 and also with the bolt 21 to hold the door rigidly against vertical'vibratory motion or displacement during operation of the vehicle. As shown in Figs. 8 and 9 this wedging means in the present instance comprises a stamped hollow casing 69'of generally rectangular shape and open at the bottom ancl'ri'gidly securedto the case plate butprojecting at the outer side of the door jamb. Slidably mounted within this casing is a wedge block' 10 controlled by means of a compression spring 1|. This spring is mounted under initial load and constantly urges the wedge block toward the left in Fig. 9. During closing movement of the door the wedge block engages the top inclined surface 66a'of the striker casing and due to frictional contact will be forced back to some extent against the action of the spring 1|. Due to this action the wedge block will constantly tend to tighten itself against thesurface 66a and, hence, will maintain the bolt 2.! firmly in engagement with the upper inclined Wall 61a of the guideway. In order to ensure'easy closing and opening of the door the wedge block '10 ispreferably formed with a curved working surface 70a which has the important advantage of preventing binding of the block against'the upper surface 66a of the casing.

It'will be noted that when the bolt 21' reaches approximately the position show'n'in-Fig. 7 and at b' in Fig. 9 and is blocked against outward movement by the lower end of the side wall'fila of the striker, the locking lever 3|] reaches the position shown in Fig. 7, having been shifted by the pin 3| in a direction opposite to the direction 'of rotation of the boltplate'25. Hence, the detent 35 will positively engage the safety locking abutment 33 on the locking lever when the bolt reaches the position shown in Fig. 7 and at b in Fig. 9. Continued closing movement 'of the door causes the detent portion 38 to ride over the smooth unobstructed edge portion 35 of the locking lever with a minimum of frictionalresistance until the detent reaches the final locking step 34. Due to the action of the spring 43 on the release lever 39 the effort of this spring will force the detent 36 upwardly so as to hold it in looking position with respect to the locking abutments 33 and 34.

Since the locking lever 36 swings oppositely to the direction of rotation of the bolt plate it will by its inertia effort, when the door is slammed, tend to force the bolt tightly against the upper side 61a of the striker, thereby tending to avoid chattering of the bolt within the guideway 61 especially where the latter, on account of slight variations due to tolerances in production, has a slightly greater width than the diameter of the bolt. This tightening of the bolt against the side 61a of the striker is also assisted by the action of the wedge block 10.

Due to the curvature of the control slot 32 in the locking member 30 the actuating pin 3| will shift the locking member a relatively short distance while the bolt travels in the guideway 61 from the position of Fig. 3 to the first locking position of Fig. 7 with the end 38 of the detent slidably engaged by the smooth non-toothed arcuate portion 30b of the locking lever. When,

however, the bolt travels in the guideway 61' from the first locking position of Fig. 7 to the final locking position of Fig. 2, the pin 3| will shift the locking member 30 a greater distance. Thus, the locking member 30 will be shifted at a variable rate between unlatched and latching positions of the bolt as compared with the rate of travel of the bolt. 7,

By locating the control pin 3| intermediate the fulcrum 29 of the locking lever and the lower edge thereof, the load exerted on the detent 36, such as when an attempt is made to force the door open, is considerably less than the load required to be sustained by the bolt. As the door is closed the locking pin 3| progressively moves 7 toward the fulcrum 29 and in the final locking at the door jamb and having a flange extending from the inner edge'of said plate portion, a pivotal latch device mounted on said plate portion,

a locking member pivotally mounted on said plate portion to swing about, an axis located at'one side of the axis of pivotal movement of said latch device, said locking member extending across the'face of said latch device, means connecting said locking member and latch device for correlated pivotal movements, the end of said locking member on the other side of said latch device axis having abutments thereon, detent means pivotally mounted on said plate portion and engageable with' one-"of said abutments to hold said locking member against swinging movement'thereby to hold said latch device in door latching position, a lever pivotally mounted on said plate portion, means manually operable from the outside of the door for swinging'said lever, said detent means and saidle'ver being mounted for'mov'ement about spaced axes, saidlevei' havinga' part arranged in opposing :r'elation to a part of said detent means to abut the same upon swingingmovement of said lever to pivotally move said detent means out of engagement with said locking plate abutments, a blocking portion onsaid locking member, a blocking member mounted for pivotal movement on saidsupport and havmemberandhold said latch device inlatchingposition even if said lever is actuated to release the detent means from said locking member. abut,

ment.

2. In a latch mechanism for a swinging door, a support having a plate portion for disposition at the door jamb and having a flange extending from the inner edge of said plate portion, a pivotal latch device mounted on said plate portion, a locking plate pivotally mounted on said plate portion to swing about an axis located at one side of the axis of pivotal movement of said latch device, said locking plate extending across the face of said latch device, means connecting said locking plate and latch device for correlated pivotal movements, the end of said locking plate on the other side of said latchdevice axis having abutments thereon, detent =means pivotally mounted onsaid plate portion and engageable with one of said abutments to hold said locking plate against swinging movement thereby/to hold saidlatch device in door latching position, a lever pivotally mounted. on, said plate portion, means manually operable from the outside of the door for swinging said lever, said detent means and said lever beingmounted for. movement about spaced axes said lever having-a part arranged in opposing relation to a part of said detent means to abut the same. upon swinging movement of said lever to pivotally move-said detent means out of engagement with said locking plate abutment, a blocking portion on said locking plate, a member mounted for pivotal movement on said support and having blocking means for cooperation with said blocking portion, and manually operable means for moving said member to dispose said blocking means in position to be engaged by said blocking ,portion thereby to block said locking plate and hold said latch device in latching position even if said lever is actuated to release the detent means from said locking plate abutment, said locking plate having a portion thereof adapted to lie in the path of movement of said blocking means when said latch device and said locking plate are in door unlatched position thereby to prevent movement of said blocking means into said blocking position.

3. In a latch mechanism for a swinging door, a support having a plate portion for disposition at the door jamb and having a flange extending from the inner edge of said plate portion, a pivotal latch device mounted on said plate portion, a locking plate pivotally mounted on said plate portion to swing aboutan axis located at one side of the axis of pivotal movement of said latch device, said locking plate extending across the face of said latch device, pin and slot means connecting said locking plate and latch device for correlated pivotal movements, said pin and slot means lying between the axis of pivotal movement of said latch device and the axis of pivotal movement of said locking plate thereby causing said latch device and locking plate to 10' pivot in oppositedirecti'ons, said locking'plate swinging toward said; flange said latch device moves from door latched to door unlatched; po sition, the end of said locking plate. on the other side of said latch device axis having abute ments thereon, detent means pivotallyv mounted on said plate portion and engageable with one of said abutments to hold said locking plate against swinging movement thereby to hold s'aid latch device in door latching position, a lever pivotally mounted on said plate portion,.means manually operable from the outside of the door for swinging said lever, said detentrmeansand,

said lever being pivotal aboutspaced axes, said lever having a part arranged in opposing relationto l part of said detent means to abut thev same upon swingingmovement'of said levergto pivotally move said detent means outfof engage? ment withsaid locking plate abutments, a blocking portion on said lockingv plate, a member mounted for. pivotal movement'on jsaid flange and having blocking means -for cooperation with said blocking portion, and manually operable means for moving said blocking portion to dispose said blocking means in position to be engaged by said blocking portion thereby to block said locking plate and hold said latch device in latching position even .if said, lever isactuated to release the detent means from said locking plate abutment.

4. In a latch mechanism fora swinging door, a support having a plate portion for, disposition at the door jamb and having a flange extending from the inner edge of said plate portion, a pivotal latch device'mountedon said plate portion, a locking plate pivotally mounted on. said plate portion to swing'about anaxis located at.

one side of the axis'of. pivotalmovement of said latch dvicafsaid lockingplate extendingacross the face of said latch device,,pin' and slot means connecting said locking plate and latch device for correlated pivotal movements, said pin and slot means lying between the axis of pivotal movement of said latch device and the axis of pivotal movement of said locking plate thereby causing said latch device and locking plate to pivot in opposite directions, said locking plate swinging toward said flange as said latch device moves from door latched to door unlatched position, the end of said locking plate on the other side of said latch device axis having abutments thereon, detent means pivotally mounted on said plate portion and engageable with one of said abutments to hold said locking plate against swinging movement thereby to hold said latch device in door latching position, a lever pivotally mounted on said plate portion, means manually operable from the outside of the door for swinging said lever, said detent means and said lever being pivotal about spaced axes, said lever having a part arranged in opposing relation to a part of said detent means to abut the same upon swinging movement of said lever to pivsaid blocking portion, and manually operable 1l= plate abutment, said locking plate having a portion thereof adapted to lie in the path of move mentof saidblockingmeans when'said latch device and said locking plate are in door unlatched position thereby to prevent movement of said blocking means into said blocking position.

.5. In a latch mechanism for a swinging door, a support having a .plate portion for dispositionrat the .doorjamband having a flange extending'from the inner edge of said plate portion, a pivotal latch device mounted on said plate portion, a locking plate pivotally mounted on said plate portion to swing about an axis located at one side of the axis of pivotal movement of said latch device, said locking plate extending across the face of said latch device, means connecting said locking Plate and latch device for correlated pivotal movements, the end of said locking plate on the other side of said latch device axis having abutments thereon, detent means pivotally mounted on said plate portion and engageable with one of said abutments to hold said locking plate against swinging movement thereby to hold said latch device indoor latching position, a lever pivotally mounted on said plate portion, means manually operable from the outside of the door for swinging said lever, said detent means and said lever being mounted for, movement about spaced axes, said lever having a part arranged inopp'osing relation to a part of said detent means, to abut the same upon swinging movement of said lever to pivotally move said detent means out of en-v 12 gaged by said blocking portion thereby to block said locking plate and hold said latch 'device in latching position even if said lever is actuated to release the detent means from said locking plate abutment, said locking plate having a portion thereof adapted to lie in the path of movement of said blocking means when said latch device and said locking plate are in door unlatched position thereby to prevent movement of said blocking means into said blocking position, and spring means mounted on said plate portion having a portion in engagement with said lever and a second portion in engagement with said latch device and effective for retracting both said latch device and locking member as well as said lever. 7

JOHN H. RO-ETHEL.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 448,298 Lecellier Mar. 17, 1891 455,949 Page July 14, 1891 470,988 Coulter Mar. 15, 1892 1,036,346 Schmittberger Aug. 20, 1912 1,161,597 Blosick NOV. 23, 1915 1,544,960 Watts July 7, 1925 2,012,732 Schmidgall Aug. 27, 1935 2,013,285 Mooney Sept. 3, 1935 2,094,413 Schonitzer Sept. 28, 1937 2,143,965 Van Voorhees Jan. 17, 1939 FOREIGN PATENTS 7 Number Country 7 Date 3,491 Great Britain Feb. 15, 1908 25,596 Great Britain Nov. 13, 1906 65,074 I Sweden Apr. 24, 1928 141,166 Great Britain Apr. 15, 1920

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