US2373237A

US2373237A - Latch and lock mechanism

Info

Publication number: US2373237A
Authority: US
Inventors: Waldemar A Endter
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-11-08
Filing date: 1943-11-08
Publication date: 1945-04-10
Anticipated expiration: 1962-04-10

Description

prlw, i945. W. A. ENDTER V? L ATCH AND LOCK MECHANISM l Filed Nov. 8, 1945 5 Sheets-Sheet l ATTORN EY.

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Patented Apr. 10, 1945 UNITED STATES PATENT ortie LATCH AND LOCK MECHANISM Waldemar A. Endter, Long Beach, Calif.

Application November 8, 1943, Serial N o. 509,485

(Cl. l-450) vide a bolt take-up means the general purpose 24 Claims.

This invention relates to latch mechanisms of the rotary bolt type, and is directed principally to improvements in locking means and their controis for maintaining the bolt against reverse or anti-latching rotation from latched positions. Although the invention is applicable to various specific types and forms of latch mechanisms for holding relatively movable members in associated or engaged condition, it is particularly adapted to automobile door't'ype latches and. accordingly, will be described with reference to such mechanisms.

Latch mechanisms of this type comprise a ro- 'tary bolt movable bodily into engagement with a keeper, and thereafter rotatable into latched position under the influence of an actuating device, e. g. one or more spring-urged cams having wedge engagement with the bolt to vexert against it an advancing thrust, and imposing a holding resistance to reverse or anti-latching rotation of the bolt, until released in the usual manner by operators controllable at the inside and outside of the door. The present invention is concerned with improved bolt locking means for positively securing or dogging the bolt against anti-latching rotation, independently of the bolt actuating or camming means.

One major object of the invention is to employ a, manually controllable -locking means, preferably in the form of a simple dogging element or assemblage, normally retracted from holding relation to the bolt and movable into the path of anti-latching rotation of the bolt to prevent such rotation, said locking means being characterized by its displaceability to bolt releasing position by advancing rotation of the bolt, as upon its movementagainst the keeper during engagement of the latch. In conjunction with such locking means, thev invention contemplates various features of control, such as the provision of a key controlled operator for locking and releasing the locking means. and an inside handle actuated control operable to similar effect, the lock setting and releasing in either instance preferably being independent of the bolt camming or other actuating means.

Another contemplated combination of controls for the locking means may include, together with the key-controlled operator, an inside handle -actuated control operable to retract the bolt actuating means but inoperative to control the locking means, and a second inside (e. g. push button) control independently operable to set and release the locking means.

A further object of the invention is to prolli and effect of which is to maintain the bolt against loose movements otherwise resulting from permitted reverse Irotation, independently of the bolt advancing means. Preferably the take-up means constitutes essentially a part or feature oi the bolt locking means,so that in the locked position of the latter, the bolt is held against reverse rotation at any of different positions. Therefore, in its latched condition, and despite retraction ofthe bolt actuating means, the bolt is securely held so that looseness will not develop Within the mechanism itself or in the position of the door.

The stated objects, as well as additional features and objects will be explained and understood to better advantage by reference to the accompanying drawings which illustrate the invention'in certain of its typical and preferred forms. In the drawings:

Fig. l is an elevational view oi the mechanism in latched condition, With the cover plate removed;

Fig. 2 is a section on line 2-2 of Fig. i showing the outside and key-'controlled operators, and their association with the parts appearing in a rig. i;

Fig. 3 is a view similar to Fig. 1 showing the locking plate complete in bolt locking position and the holding or camming means and step plate in released position;

Fig. i is a section on line ii-d oi Fig. l;

Figs. 5, 6, 7 and 8 are perspective Views of the cam, step plate, releasing plate and looking plate, respectively;

Fig. 9 is a perspective view ofthe cam, step plate and releasing plate in assembled relation:

Fig. 10 is a view similar to Fig. 1 illustrating a, variational form of the invention;

Fig. 11 is a section on line li-ll of Fig. 10,

with an added showing of a push-button |connection with the locking plate;

Fig. 12 is a fragmentary view illustrating the position of the lock plate of Fig. 10, in bolt locking position;

Figs. 13 and 14 are front and right side views, respectively, of the cam element in the variational iorm;

Figs. 15 :and 16 are front and right side views, respectively, of the locking plate; and

Figs. 17 and 18 are front and right side views,

' respectively, of the take-up wedge associated with the locking plate.

Referring rst to the form of the invention shown in Figs. 1 through 9, certain parts of the e handle operated on 30 mechanism are contained within a case I8 having side anges I I and top and bottom flanges I2 and I3 to which is secured the cover plate I4 as by bolts I5 or other suitable means. Formed integrally with the case is a guide I6 at opposite sides of which are positioned the later described bolt actuating means of the retracting plate. The cover plate I4 has an opening at I8 to receive an independently mounted `keeper I1. supported for example on a door pillar, and engageable with the rotary bolt I8 by movement of the door-carried case and bolt assembly against and along the keeper, such movement being permitted by reception of the keeper within an opening at |8 in the cover plate I4. The keeper is engageable with a transversely extending member secured to the case flange I3, the keeper in the latched position of the parts being confined between the bolt and the upper surface of member 20. The rotary bolt I8 may be of the conventional type, comprising a suitable number of radially extending, equi-anguiarly spaced heads I8a, rotatable from a position of initial engagement with the end I1a of the keeper to the latched position appearing in Fig. 1. The bolt is rotatable on a shaft 2l secured at 22 to the cover plate I4 and supported at 23 within the case I0.

The rotary bolt is urged in its advancing or latching direction 0i' rotation by a spring-pressed camming device, generally indicated at 24, which also constitutes a holding means resisting reverse or anti-latching rotationof the bolt independently of the lock plate. 'I'he assembly of parts going to make up the camming device 24 will be referred to as holding means. The identities and relationship of these individual parts will be more clearly understood by reference to the perspective views in Figs. 5 through 9.

The bolt is engaged and urged in a latching direction by a wedgcor cam element 28 having a slot 26 and an angular surface 21 which is brought into wedging engagement with one of the bolt heads I8a. One top corner of the cam element is notched and beveled at 28 and 28 to accommodate swinging movement of the outside I, see Fig. 2, as will later appear.

The latch mechanism optionally may include a bolt holding or clogging element in the form of a step plate 30, see Fig. 6, associated with and overlying the cam element 25. The step plate has a slot 3| registerable with slot 26 in the cam `ele ment, and is shaped to provide a series of stepped surfaces 32 in angular or inclined sequence, each surface being substantially parallel with the 0D- posite straight side 33 of the plate and the inside surface ||b of the case flange along which the cam element and step plate are reciprocally slideable. The step plate carries a rearwardly projecting lug 34 and an arm 38 engageable, as will appear, by the releasing' plate lug 36.

Referring now to Fig. '1, the releasing plate 31 there shown has an arm 38 having rearwardly turned end 33 which, together with the step plate lug 34, projects through a slot 40 in the case I0, as appearing in Fig. 2. A bottom corner of the plate 31 is notched at 4I to accommodate the inner end 42 of the inside operator arm 43, see Figs. l and 4, and the releasing plate is 'slotted at 44 to pass the key-controlled arm 48 which operates the lock plate 46.

In their assembled condition in the latch mechanism. the cam element, step plate and releasing plate occupy the position shown in Fig. 9. Normally the cam element 28 and step tracted positions.

plate 38 are held against relative longitudinal movement by a coil spring 41 contained within the slots 28 and 3| and confined between a pair of L-shaped pieces 48, see Fig. 3, overlapping the

parts

28 and 38 so that longitudinal movement of either part tends, through the spring 41, to move the other part in the same direction. Upon upward movement of the releasing plate 31, the engagement of lug 38 with the step plate arm 38 produces corresponding lifting of the cam element and step plate assembly.

The locking plate 48 shown in- Fig. 8 comprises an outwardly offset portion 46a Joined along the bend 43 with an inwardly offset portion 48`b which carries a flange 60 slideable on the bottom surface of the case I0. The outwardly offset portion 46a is shaped to cverlie the assembly shown in Fig. 9 and to permit vertical displacement of the locking plate in its movements into and out of locking relation to the bolt. Plate 48 contains a slot 5| which receives the inner end of the key-controlled ann 48. The plate is notched at 62 to accommodate swinging movement of the inner end 42 of arm 43 in its actuations of the releasing plate, as will appear. The end 42 is engageable with a shoulder 53 integral with the locking plate and re-enforced by bracket 64, to move the locking plate from its retracted position of Fig. l to the bolt locking position of Fig. 3. Shoulder 56 is engageable by the arm to return the locking plate to normal retracted position. Plate 48 is releasably held in its two described positions by suitable detent, generally indicated at 86, see lig. 4, shown typically as a spring arm 51 carrying a protuberance 58 engageable within either of

openings

68 and 80| in the locking plate.

Referring now to Fig. 2, the cam element, step plate and releasing plate assembly of Fig. 9 is yieldably pressed toward the bolt to bring the wedge and stepped

surfaces

21 and 32 in engagement therewith, Iby an arm 60 oscillating on a pivot 6| supported by spaced

plates

62 and 63 integral with the case III. The arm 60 is biased against arm 33 Iby a relatively strong coil spring 64 suitably supported at 65, to'cause the releasing plate shoulder 38| to press against the upper end 25| of the cam. Arm 60 thus is operable to move the cam element, step plate and releasing plate from the retracted position of Fig. 3, to the bolt-engaging positions of Fig. 1 in which the step plate is urged against the bolt iby the relatively weak spring 41 -by reason of the cam movement to a position somewhat ahead of the step plate. An arm 38| carried by shaft 68 of the outside door handle (not shown) is movable by counter-clockwise rotation to engage lug 34 and lift the step plate, also the cam 'by way of spring 41, and the releasing plate by the engagement of the cam end 25| with the releasing plate shoulder 38|, to their re- Normally the arm 30| is biased against lifting engagement with the lug 34, by a coil spring 61 connected to the arm hub 30a and a suitable support 68.

'Ihe lock plate 46 is shiftable ybetween the positions of Figs. l and 3 by arm 45 pivotally, mounted at 88 on a stationary support 69 integral with the case I II. The arm 45 is actuated when engaged by a rotatable lug 18 carried on a key-operated orl controlled shaft 1|. It will be understood without necessity Ifor specific illustration, that the shaft 1| will have associated therewith the conventionally used key plug, all in a manner such that turning of the key in a lockthe locking plate to be in its retracted position oi' Fig. 2, clockwise rotation of shaft 1| brings lug into engagement with surface 13 to swing the arm 45 downward to bolt locking position 'by the camming action oi lug 10 against surface 13. The lug then is received within the enlarged diameter portion 14 of the slot li. Arm 45 and the locking plate 46 are returnable to their unlocking positions by key controlled turning of lug 1o against surface 12 to cam the arm 46 upward to the normal unlockedrposition of Fig. 2.

Referring now to Fig. 4, the lever 43 is piv- `otally mounted at 16 on a suitable support 11 integral with the case III and is operable in the usual manner by an inside door handle (not shown) connected at 18 with the arm 19. Downward swinging movement of the lever 43 causes its end 42 to' engage. the' nick plate shoulder 53 which shifts the plate to the bolt locking position of Fig. 3. Reverse swinging of the lever engages the end 42 with the locking plate shoulder 55 to restore the plate to its normal retracted position. Upward swinging of lever 43 from the normal or neutral position of Fig. 4 engages the end 42 with the releasing plate shoulder 8U to elevate the assembly of Fig. 9 and retract the cam element and step plate from holdingv engagement with the rotary bolt.

Considering now the operation ofthe described mechanisms, assume first the latch to be in opened condition, i.V e. with the bolt entirely disengaged from the keeper, and with the cam thrust downwardly by the arm 60 to the limiting position permitted by the bolt. Upon bodily closing movement of the bolt, one of the bolt heads I8'a engages the end surface |1a of'the keeper and upon continuance of such movement the bolt is rotated to bring an adjacent head into engagement with the lower end of the cam and step plate assembly, displacing the latter upwardly against the resistance of the spring pressed arm 60 until the trip position of the cam is reached. This is the initial position at which the inclined cam surface 21 engages the bolt head to exert a. thrust acting to cam and advance the bolt along the keeper in a direction of clockwise rotation to the home or fully latched position as in Fig. 1. At that position, reverse or anti-latching rotation of the bolt is resisted, and ordinarily electively prevented, by the holding action of the cam surface against the b'olt. When used, the step plate 30 serves as positive assurance against anti-latching bolt rotation in that should for any reason the cam become upwardly displaced, and therefore permit lreverse rotation of the bolt, the bolt head engages one of the vstepped surfaces 32 which, by reason of its parallel relation to the supporting surface Hb, presents until manually retracted, a positive barrier to further reverse bolt rotation.

A particular feature of Y improvement is a keeper-engaged abutment lwhichserves to obviate looseness in the bolt position or condition resulting say from the capacity of the door for iurtherclosing movement after the bolt has reached a limiting home position under the infiuence of the cam. The abutment is shown to comprise a member or block `8l supported by or integral with.- a portion of the case, such as nange 82, which is engaged by the end portion lIIa of the keeper preferably before the bolt reaches the ultimate home or latched position of which it is capable of reaching. Accordingly.

ing it of rubber, so that it will remain in astate of compression while engaged with the keeper in a latched position of the bolt.

From the foregoing description it will be understood that the cam and step plate assembly may be retracted to release the bolt for opening or anti-latching rotation, either by operation of the outside. handle shaft 88 and arm 30| independently of the releasing plate 31, or by actuation 'of the inside operated lever 43 and elevation oi the assembly in Fig. 9. Ineither instance upon release of the retracting force, the cam is restored to engagement with the bolt by the action of arm 60 against arm 38.

Assume now that it is desired to lock the bolt in-latched position, independently of the cam and step plate. By rotation of the key controlled shaft 1l as explained, arm 45 releases the locking plate 48 from the detent i8 and throws the locking plate down to the position of Fig. 3 in which the lower dog or projection 33 is brought into the path of reverse rotation of the bolt to lock the bolt against disengagement from the keeper. The plate 46 also is movable to bring the dog 83 into locking association of .the bolt, by downward swinging of lever 43 from the inside door handle, and independently of the key-controlled operator. The plate 46 of course is retractable from its locked position by either the key controlled operator 45 or the inside handle controlled operator 43. It will be observed that retention of plate 48 in the bolt locking position, is independent of the cam and step plate position and any release thereof by the inside or outside handle-controlled operators.

Assume now the door to be in openposition with the rotary bolt disengaged from the keeper with the camY thrust down against the side of the bolt, and assume also the latch to be in locked condition, i. e. with plate 46 in the position of Fig. 3. The dog 83 is automatically releasable from locking relation to the bolt as an incident of closing movement of the door, and specifically by virtue of advancing rotation of the vbolt foilowing its initial engagement with the end I'la of the keeper. The resulting bolt rotation causes the bolt to engage the lower end 83a of the locking dog, and to elevate the plate 46 to its retracted position.

The variational form of the invention shown in Figs. 10 to 18 is similar to the above described embodiment with respect to the general structure and arrangement of the case, bolt, keeper, the key-controlled operator and the inside and outside handle-controlled operators, and accordingly corresponding parts' in the two embodiments are given corresponding reference numerals. The variational form diners primarily with respect to ing plates, the locking plate control and by incorporation of the bolt take-up feature mentioned in the introduction.

Here the cam plate 85 having an inclined wedge A arm 90|, see Fig. 10,' to retract the cam. Plate 86 has a transverse extension 99 carrying a depending arm 90 and a lug 0| engageable by the inside handle-controlled lever 43 to elevate and retract the cam.

Associated with the cam plate is a locking plate 92 having the same general shape characteristics as the locking plate 40 in the iirst described-form. The plate is slotted at 99 to contain a coil spring 94 bearing at its upper end against an inwardly projecting lug 95 on the plate. Slot 99 receives the key-controlled operator 4l, as before.` `The side of the plate is notched at 91 to receive and accommodate upward swinging of the lever end 42 in its cam releasing movement. Between the

vdetent receiving openings

98 and 99 the surface of the plate is raised to a mid-ridge to form a cam tending to cause'the locking plate to be moved under the influence of spring 51 fully to the detent setting positions in either direction of the plate travel. At its upper corner, the plate carries a rearwardly projecting arm |0I which has a pivotal connection |02 with an operator |09 controlled by push button |04 at the inside of the door |05. Directly associated and movable with the locking plate 92 is a take-up element |09 having a head |01 provided with a wedge surface |08 and a forwardly projecting lug |09. As illustrated in Fig. l0, the upper reduced width portion ||0 of the element is adapted to extend at the left sideof the spring 94. The lower end of the latter bears against lug |09 projecting forwardly through slot 93 in the locking plate so that the plate and element are movable together downwardly from the position of Fig.- 10 to bring the wedge surface |08 into engagement with the bolt. .Continued downward movement of the locking plate bringing the dog |I| into locking relation with the bolt |9, see Fig. 12, compresses the spring 94 to constantly thrust the element |06 against the bolt.

The manner of actuation and-control of the cam plate 85 by

arms

90 and 90| (the former engaging surface 2 of the cam plate) will be apparent from the foregoing description of the operation of the rst illustrated form oi' the invention. Also it will be apparent that the cam plate likewise is retractable by upward swinging of the lever end 42 bearing against the lug 9|. Moreover, it will be understood that, as before, advanc-Y ing rotation of the bolt following its initial en gagement with the keeper as the door is closed, serves to displace either or both the cam plate and the assembly of the locking plate 92 and take-up element |06 from bolt holding or locking positions to their retracted positions.

Plate 92 and the take-up element |09 are movable downwardly from the position of Fig. 10 to that of Fig. 12 by actuation of the key-controlled operator 45. The inside handle-controlled operator 43 however in this instance is ineffective to similarly throw the locking plate and take-up element assembly into bolt locking position since `downward swinging of the lever end 42 below the position of Fig. 11 is limited by its engagement at I I3 with the bottom of the case slot I4 through which the lever extends. However, the locking plate and take-up element are controllable at the inside of the door in both directions oi' their' travel, by way of the push button operator |03.

When its wedge surface |08 is thrust against the boit, the opposite straight edge of the take- A up element bears and is supported against the asvaasv rotation of the bolt from any of its different latched positions. Whereas when using alone the simple form of dog 83 in the ilrst described form, retraction of the cam 25 may permit some looseness irl the dog and bolt engagement and limited capacity of the bolt for reverse rotation. the presence and action of the element |09 imposes a barrier'which is self-acting to take up any bolt looseness or freedom of movement that might otherwise be permitted. Consequently, despite retraction of the cam, the parts cannot be shaken or vibrated in any manner to cause breakage or looseness permitting opening of the latch.

I claim:

v1. A latch mechanism comprisinga bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and movable to a position preventing rotation of the bolt in a reverse or anti-latching direction, an operator for retracting said holdingmeans to release the bolt from latching association and engagement with the keeper, and a locking member normally retracted out of the path of reverse rotation of the bolt and movable into said path to lock the bolt against reversing rotation independently 'of said holding means, said locking member being movable to boit releasing position by advancing rotation of the bolt resulting from its engagement with the keeper as the door is moved from open to closed positions.

2. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and movable to a position preventing rotation of the bolt in a reverse or anti-latching direction, an'operator for retracting said holding means to release the bolt from latching association and engagement with the keeper, and a reciprocally displaceabie locking member in side-by-side relation to said holding means, said locking member normally being retracted out of the path of reverse rotation of the boit and being movable into said path to lock the bolt against reversing rotation independently of said holding means, said locking member being movable to bolt releasing position by advancing rotation of the bolt resulting from its engagement .with the keeper as the door is moved from open to closed positions.

3. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and movable to a position preventing rotation of the bolt in a reverse or anti-latching direction, operators controllable at the inside and outside of said door and individually actuabie to retract said holding means to release the bolt from latching association and engagement with the keeper, and a normally retracted locking member movable into the path of reverse rotation of the bolt to lock the bolt against reversing rotation independently of said holding means, said locking member being movable to bolt releasing position by said inside operator and also by advancing rotation of the bolt resulting from its engagement with the keeper as the door is moved from open to closed positions.

4. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure al door to a stationaryV member. holding means operable to rotatably advance said bolt lin latched association with the keeper and movable to a positlonpreventing rotation of the bolt in a reverse or anti-latching direction, operators controllable at the inside and outside of said door and individually actuable to retract said holding meansto release the bolt from latching association and engagementl with the keeper, and a normally retracted locking member movable by the inside operator into thepath of reverse rotation of the bolt to lock the bolt against reversing rotation independently of said holding means, said locking member being. movable to bolt releasing position by said inside operator and also by advancing rotation of the bolt resulting from its engagement with the keeper as the door is moved from open to closed positions.

5. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, holding means retracted locking member movable by said key.- controlled operator into the path of reverse rotation oi' the bolt to lock the bolt against reversing rotation independently of said holding means,4 said locking member being movable to bolt releasing position by advancing rotation of 4 the bolt resulting from its engagement with the lil operable tp rotatably advance said bolt in latched association with the keeper and movable to a position preventing rotation of the bolt in a reverse or anti-latching direction, an operator for retraoting said holding means torelease the bolt from latching association and engagement with the keeper, a normally retracted locking member movable into the patch of reverse rotation of the bolt to lock the bolt against reversing rotation independently of said holding means,

said locking member being movable .to bolt re-v leasing position byadvancing rotation of the bolt resulting from its engagement with the keeper as the door is moved from open to closed positions, and detent means for holding said locking member in its bolt releasing position.

6. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationaryl member, holding means operable to rotatably advance said bolt in latched association with the keeper and movable to a position preventing rotation of the bolt in a reverse or anti-latching direction, an operator for retracting said holding means to release the bolt from latching association and engagement with the keeper, a key-controlled operator, a normally retracted locking member movable by said keycontrolled operator into the patch of reverse rotain latched association with the keeper land movable to a position preventing rotation of the bolt in a, reverse or anti-latching direction, an operator at the outside of the door for retracting said holding means to release the bolt from latchingassociation and engagement'with the keeper,` a key-controlled operator, a normally keeper as the door is moved from open to closed positions, and an operator controllable at the inside of the door and actuable to retract said holding means and also to move said locking member into and out o! bolt locking position.

8. I n a latch for association between two relatively movable parts. a bolt carried by one part, said bolt having a first position in which it cooperates with an associated keeper to restrain said parts in closed position and being movable from such position so as to enable it to clear said keeper and permit an opening movement of such parts. a holding member movably carried by said one part and operatively associated with said bolt in such relation as to enable it to prevent a said movement of said bolt, an operator actuable to retract said holding member out oi cooperative relation to said bolt so as to enable a said movement of said bolt, locking means which normally occupies a retracted position out of cooperative relation to said bolt but is movable from such retracted position into a locking position in which it blocks a said movement of said bolt despite the movement of the holding member out of cooperative relation to the. bolt caused by an actuation of the operator, and means operated as an incident to a closing movement of said parts for restoring said locking means to the unlocked position.

9. In a latch for association between two relatively movable parts, a bolt carried by one part, said bolt having a first position in which it cooperates with an associated keeper to restrain said parts in closed position and being movable from such position so as to enable it to clear said keeper and permit an opening movement of such parts, a holding member movably carried by said one part and operatively associated with said boltin such relation as to enable it to prevent a said movement of said bolt, an operator actuable to retract said holding member out of cooperative relation to said bolt so as to enable a said movement of said bolt, locking means which normally occupies a retracted position out of cooperative relation to said bolt but is movable from such retracted position into a locking position in which it blocks a said movement of said bolt despite the movement of the holding member out of cooperative relation to the bolt caused by an actuation of the operator, said bolt being movable by said keeper in a direction which is the opposite of said first mentioned bolt movement during a closing movement of said parts, and being effective during said last mentioned opposite direction o!` movement to restore said locking means to said retracted position thereof.

10. In a latch for association between two relatively movable parts, a, bolt carried by one part, said bolt having a first position in which it cooperates with an associated keeper to restrain said parts in closed position and being movable from such position so as to enable it to clear said keeper and permit an opening movement of such parts, a holding member movably carried by said one part and operatively las-` sociated with said bolt in such relation as to enable it to prevent a said movement of said bolt, an operator actuable to retract said holding member out of cooperative relation to said bolt so as toenable a said movement of said bolt, locking means which normally occupies a retracted position out of cooperative relation to said bolt but is movable from such retracted position into a locking position in which it blocks a said movement oi' said bolt despite the movement of the holding member out of cooperative relation to the bolt caused by an actuation of the operator, a key-controlled operator for moving said locking means from its said retracted position to said locking position, and means operated as an incidentto a closing movement of said parts for restoring said locking means to theunlocked position.

11. In a latch for association between two relatively movable parts, a bolt carried by one part, said bolt having a first positionin which it cooperates with an associated keeper to restrain said parts in closed position and being movablefrom such position so as to enable it to clear said keeper and permit an opening movement of such parts, a holding member movably carried by said one part and operatively associated with said bolt in such relation as to enable it to` prevent a said movement oi' said bolt, an operator actuable to retract said holding member out of cooperative relation to said bolt so as to enable a said movement oi' said bolt, locking means which normally occupies a retracted position out of cooperative relation to said bolt but is movable from such retracted position into a locking position in which it blocks a said movement of said bolt despite the movement of the holding member out o! cooperative relation to the boli-l caused by an actuation o! the operator, a key-controlled operator ior moving said locking means from its said retracted position to said locking position. said bolt being movable by said keeper in a direction which is the opposite of said ilrst mentioned bolt movement during a closing movement of said parts, and being eilective during said last mentioned opposite direction of movement to restore said locking means to said retracted position thereof.

12. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure aV door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and positioned to prevent rotation oi' the bolt in a reverse or anti-latching direction, a ilrst operator controllable at the inside of the door for retracting said holding means to release the bolt from latching association and engagement with the keeper, a second operator controllable at the inside of the door independently of said first operator, a normally retracted locking member movable into the path of reverse rotation of the VAbolt to lock the bolt against reversing rotation independently of said holding means, said locking member being movable to bolt releasing position by said second operator and by advancing rotation o! the bolt resulting i'rom its engagement with the keeper as the door is moved from open to closed positions.

13. A latch mechanism comprising a bolt rotatabley in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and positioned to bolt locking position, a second operator controllable at the inside of the door independently of said iirst operator, said locking member being movable to bolt releasing position by said second operator and by advancing rotation of the boit resulting from its engagement with the keeper as the door is moved from open to closed positions.

14. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a' door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and positioned to prevent rotation oi the bolt in a reverse or antilatching direction, a first operator controllable at the inside of the door for retracting said holding means to release the bolt from latching association and engagement with the keeper, a second operator controllable at the inside o! the door independently oi' said ilrst operator, a keycontrolled-operator, a normally retracted locking member movable by said key-controlled operator into the path of reverse rotation of the bolt to lock the bolt against reversing rotation independently oi' said holding means, said locking member being movable to bolt releasing position by said second operator and by advancing rotation of the bolt resulting from its engagement with the keeper as the door is moved from open to closed positions. v

15. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and positioned to prevent rotation of the bolt in a reverse or antilatching direction, an operator for retracting said holding means to release the bolt from latching association and engagement with the keeper, locking means actuable to lock the bolt against reverse rotation independently of said holding means, said locking means normally being out of the path o! reverse rotation of the bolt and therefore being ineffective to so lock the bolt against reverse rotation, and a key-controlled operator for actuating said locking means to lock the bolt, said locking means being releasable by advancing rotation of the bolt during movement of the door from open to closed positions.

16. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and positioned to prevent rotation ot the bolt in a reverse or antilatching direction, a first operator controllable at the outside or the door for retracting said holding means to release the bolt from latching association and engagement with the keeper, locking means actuable kto lock the bolt against reverse rotation independently of said holding means, said locking means normally being ine!- fective to^so` lock the bolt against reverse rotation, a second operator controllable at the inside able by advancing rotation of the bolt during movement of the door from open to closed po-l sitions.

1'7. In a latch mechanism, a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, actuating means for advancing the bolt through progressive positions of latched engagement with the keeper and for holding the bolt against reverse or anti-latching rotation, said actuating means being retractable to permit said reverse rotation oi' the bolt. and means operable when said actuating means is retracted to hold the bolt against reverse rotation from any of said progressivelatched positions. f

18. In a latch mechanism, a bolt rotatable in advancing and reversing directions 'and co-operable with a keeper to releasably secure a door to a stationary member, actuating means for advancing the bolt through progressive 'positions oi' latched engagement with the keeper and for holding the bolt against reverse or anti-latching rotation, said actuating means being retractable to permit said reverse rotation of the bolt, and means constantly engageable with the bolt in said progressive latched positions thereof when said actuating means is retracted to hold the bolt against reverse rotation from any of said psitions.

19. In a latch mechanism, a bolt rotatable in advancing` and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, actuating means for ad vancing the bolt through progressive positions of latched engagement with the keeper and for holding the bolt against reverse or anti-latching rotation, said actuating means being retractable to permit 'said reverse rotation of the bolt, and means independent yof said actuating means and movable into the path of reverse rotation of the bolt to lock the bolt against reverse rotation and engageable with the bolt in said progressive latched positions to prevent reverse rotation of the bolt from any of those positions. i

20. In a latch mechanism, a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary membenactuating means for advancing the bolt through progressive positions of latched engagement with the keeper and for holding the bolt against reverse or anti-)etching rotation, said actuating means being retractable to permit said reverse rotation of the bolt, and

`means including a spring-pressed element operable when said actuating means is retracted to hold the bolt against reverse rotation trom any of said progressive latched positions.

21. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member, holding means y operable to rotatably advance said bolt through progressive positions of latched association with the keeper and positioned to prevent rotation o! the bolt in a reverse or anti-latching'direction, an operator for retracting said holding means to release the bolt from latching association and ensagement with the keeper,..and a normally retracted locking means movable into the path of reverse rotation of the bolt to lock the bolt against reversing rotation independently of said holding means, said locking means being movable to bolt releasing position by advancing rotation ot the bolt resulting from its engagement with the keeper as the door is moved from open to closed po# sitions. and said locking means being operable when said holding meansis retracted to hold the bolt against reverse rotation from any ot said progressive latched positions.

' 22. A latch mechanism comprising a bolt rotatable in advancing and reversing directions and co-operable with a keeper to releasably secure a door to a stationary member. holding means operable to rotatably advance said bolt through progressive positions o! latched association with the keeper and positioned to preventrotation oi the bolt in a reverse or anti-latching direction, an operator for retracting said holding 'means to release the bolt from latching association and engagement with the keeper, and a normally retracted locking means movable into the path of reverse rotation of the bolt to lock the bolt against reversing rotation independently of said holding means, said locking means being movable to holt releasing position by advancing rotation of the bolt resulting from its engagement with thekeeD- er as the door is moved from open to closed positions, and said locking means being constantly ss engageable with the bolt in said progressive D0- sitions thereof when said holding means is retracted to hold the bolt against reverse rotation from any of said positions.

23. A latch mechanism comprising a bolt roso tatable in advancing and reversing directions and fly actuable to move said locking means into and n cooperable with a keeper to reieasably secure a door to a stationary member. holding means operable to rotatably advance said bolt in latched association with the keeper and positioned to prevent rotation ot the bolt in a reverse or antilatching direction, a normally retracted locking means movable into the path of reverse rotation of the bolt to lock the bolt against reversing rotation independently of said holding means, and 'individually controllable operators llectively actuable at the inside or outside ot the door to move said locking means into and out of locking association with the bolt. 1 a

24. A latch mechanism comprising a boit rotatable in advancing and reversing `directions and co-operable withl a keeper to releasably secure a door to a stationary member, holding means operable to rotatably advance said bolt in latched association with the keeper and positioned to prevent rotation oi.' the bolt in a reverse or antilatching direction, a normalhr retracted lockin means movable into the path ot reverse rotation o! the bolt to lock the bolt against reversing rotation independently ot said holding means. a key-controlled operator actuable at the outside oi the door, and a second operator actuable at the inside of the door, said operators being selectiveout ot locking association with the bolt.

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