US2641495A

US2641495A - Door lock

Info

Publication number: US2641495A
Authority: US
Inventors: James D Leslie; Clyde H Schamel
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1947-11-28
Filing date: 1947-11-28
Publication date: 1953-06-09
Anticipated expiration: 1970-06-09

Description

June 9, 1953 v.1. D. LESLIE ET AL DOOR Loqx Filed Nov. Q8, 1947 9 Sheets-Sheet l INVENTORS dame: 0. [GS/f8 WM M m m ATTORNEYS June 9, 1953 J. D. LESLIE ET AL 2,641,495

DOOR LOCK Filed Nov. 28, 1947 9 Sheets-Sheet 2 INVENTORS James D. Les/is 63 C/yae Jc/rame/ ATAGBIIKYB J. D. LESLIE ET AL DOOR LOCK June 9, 1953 9 Sheets-Sheet 3 Filed NOV. 28, 1947 IQQ LEW k\ o.

INVENTOR James 0. Zea/fa IE Y 0/ /46 hfJcfia/msf H M I I fiTI'OR/VEY J. D. LESLIE ET AL DOOR LOCK 9 Sheets-Sheet 4 A TTORNEYS June 9, 1953 Filed Nov. 28, 1947 June 1953 J. D. LESLIE ET Al. 2,641,495

DOOR LOCK Filed Nov. 28, 1947 9 Sheets-Sheet e INVENTOR." James 0., Les/la BY C/yae H. .jchame/ ATTORNEY-f June 9, 1953 J. D. LESLIE ET AL 2,641,495

DOOR LOCK 9 Sheets-Sheet 7 Filed Nov. 28, 1947 INVENTORJ. Jame s D. L es/ie A770RN Y5 BY C/yae H. Jc/mme/ mUHL J 5 8 w 9 t m. M 4 a N n Em A 4 4 W1 5. w 1 2 m M S P. 9 W Jhu Y 34W mm J. D. LESLIE ET AL DOOR LOCK June 9, 1953 Filed Nov. 28, 1947 June 9, 1953 J. D. LESLIE ET AL 2,641,495

DOOR LOCK Filed Nov. 28, 1947 9 Sheets-Sheet 9 IIIIII W JNVENTORP James D. [ES/l6 By 6/5/04? H Jcfiam/ v ATTORNEYS Patented June 9, 1953 OFFICE noon LOCK Delaware Application November .28, 1947, Serial No. 788,534

12 Claims. (o1. 292- 229) This invention relates to a door lock for automotive vehicle.-

It is common practice in the present day automobile to seal the door in the door opening by means of an elastic rubber strip which extends completely around the edge of the door. This rubber door seal is compressed or distorted between the door and the portion of the vehicle body defining the door opening when the door is closed. The hinged door is held closed by inter engagement of the latch bolt and the striker plate. The outward force or thrust exerted by the compressed door seal is considerable and. usually runs in the neighborhood of about one hundred pounds but may be more Or less. sealing pressure of the door is considerable, the conventional sliding bolt type latch requires considerable force to retract the same out of interengagement with the striker plate and therefore under such conditions thesliding bolt type lock is not suitable for operation by a push button but requires a handle of the lever type.

It is an object of this invention to produce a door lock for an automotive vehicle which operates easily and virtually independently of the door sealing pressure.

The invention contemplates a door lock for an automotive vehicle wherein the lock bolt can be readily and easily released out of interengagement with the striker by, e. g., a finger actuated push button or trigger or pull-out mechanism virtually irrespective of the door sealing pressure and even when sealing pressures are used which are considerably higher than practically necesasry for effecting a weather-proof seal. between the door and the portion of the vehicle body defining the door opening.

This purpose is accomplished by providing the door lock with a roller type lock bolt which is maintained in interengagement with the striker plate by a multiplier lever and detent lever, the multiplier lever having considerable mechanical Where the 2 Fig. 4 is a detail similar to Fig. 3 showing the push button in bolt releasing position.

Fig. 5 is an elevation ofour lock showing the position of the various parts when the bolt is interengaged with the striker and the lock is unlocked-so that the bolt can be released by actuation of the outside push button or the in+ side control.

Fig. 6 is a section along the line 66 of Fig. 5. Fig. '7 is a section along the line 'l! of Fig. 5. Fig. 8 is a detail of the upper right hand portion of the lock shown in Fig. 5.

' Fig- 9 is an elevationof ourlock showing the position of the slide bar'when the outside push button is inefiective to retract the detent lever. .F'ig. 10 is a section along the line. l0lll of Fig. 11 is an elevation of the lock showing the position of the parts when the bolt is disengaged 1 multiplier lever and. detent lever when the lock bolt is fully engaged with the striker.

advantage over the bolt and the detent lever being disengageable from the multiplier lever by motion transversely of the direction of application of a force of the multiplying lever on the detent so that release of the detent can be accomplished with only a fraction of the force exerted by th multiplier lever upon the detent lever.

Fig. l is a fragmentary inside view of a ve- 'hicle door and body with our lock holding the door closed.

Fig. 2 is a section along the line 22 of Fig. 1.

Fig. 3 is a section along the line 3-3 of Fig. 1 showing the outside stationary door handle and push button for releasing the latch bolt.

Fig. 18 is an enlarged fragmentary detail of the multiplier lever and detent lever in safety position.

Fig. 19 is an elevation showing a modified form of our lock with the bolt disengaged from the keeper.

Fig. 20 is an elevation of the modified form of lock showing the position of the parts when the bolt is fully interengaged with the keeper.

Fig. 21 and 22 are detail showings of individual parts of our modified form of lock.-

Fig. 23 is a. fragmentary elevation of our modified-form of lock showing the lock bolt in safety position.

Figs. 24, 25 and 26 tively along the lines 2i24, 2525 and 2626 a of Fig. 2 0.

Fig. 27 is a top plan view of the inside, control push button arrangement which can be usedwith either form of the invention.

Referring more particularly to the drawings there is shown a portion of an automobile body I having a door 2 which is hinged in the conventional and well known manner. A striker 3 is secured by screws on the body pillar t. The outer face oi the pillar is designated 5. Striker 3 has a dog-leg form of channel 6 having a'portion l which extends inwardly from the outside of the are sections taken respeobody and slightly upwardly and a portion 8 which extends upwardly at an acute angle to the vertical. .The lower face of the channel is designated 9 and the upper face III.

The lock bolt takes the form of a lever II pivoted to the lock frame I2 by pin I3 which is riveted over at each end, The body of the bolt is preferably a stamping and the head I5 is made of a rolled section or die cast material and secured to the body by rivets I5. A roller I5 is journalled on the end 11 of the bolt head and retained thereon'by washer I9 and the upset portion I9 of the bolt head. Flange 4! of lock frame I2 is provided with a vertical slot 42 in which the bolt head I4 swings vertically.

A multiplier lever 29 is pivotally mountedupon lock frame I2 by rivet pin 2|. Lever 29 is provided with a radially extending recess 22' which slidably receives the enlarged cylindrical head 23 of rivet I5. Lever 20 is provided with

teeth

24 and 25 each of which are arranged to interengage tooth 26 of detent lever 2! which is pivoted on lock frame I2 by pin 28. A convolute spring 29 has one arm 30 anchored to bolt I I as at 3| and the other arm 32 anchored to detent lever 21 as at 33 (Fig. 5). As viewed in Fig. 5, spring 29 urges both bolt II and detent lever 21 downwardly or in a clockwise direction. The use of sprin 29 for swinging bolt II downwardly is preferred but optional because bolt I I will swing downwardly of its own weight whenever detent lever 21 is disengaged from multiplier lever 29. Referrin to Fig. 17, it will be seen that multiplier lever 29 swings about the center 34 of pin 2I as a center. The respective faces 35 and 33 of

teeth

24 and 25 are positioned radially of center 34 exactly the same distance. It is also evident that the lever arms extending between axis 34 and faces 35 and 36 respectively are each considerably longer than the lever arm extending between axis 35 and the line of contact 31' between the lower face 38 of recess 22 and pin 23.

Detent lever 21, which swings about the center 39 of pin 23 as an axis, has the face 40 of tooth 25 formed as a true are, the center of which is axis 39. Similarly face 36 of tooth 25 is an arc of a true circle, the center of which is axis 39 when faces 36 and 40 are interengaged or in contact with each other. In other words, faces 3-5 and 49 are arcs having equal radii and a common center. Arcuate face 36 is tangent at its midpoint to a radial straight line passing through axis 34 and the same is true of arcuate face 35 of tooth 24. interengaged a counterclockwise movement of detent lever 2? will not swing multiplier lever 29 about its axis and consequently only sufiicient force need be applied to detent lever 21 to overcome the friction between faces 36 and 40. In

other words, detent lever 21 can be released without movement of lever 20 because arcuate faces 36 and 58 have a common center 39 and therefore in releasing detent lever 21 it is not necessary to overcome any force except that tangentially exerted by face 35 against face 49 at the area of contact, Thus, because a large proportion of the door seal force is absorbed in' friction, bolt II can be released very easily and virtually irrespective of the sealing pressure exerted against the bolt.

' By way of illustration: When the door is fully closed and the lock bolt is in raised position, shown in Fig. 5, if the rubber door seals exert eighty pounds pressure against the bolt head I6,

then the pressure exerted by pin 23 at line 31 face 45.

Thus, when

teeth

25 and 26 are 7 4 on multiplyin lever 20 will be about sixty pounds (about thirty-eight pounds being absorbed in friction of the bolt II and its attaching parts against the lock case I2, and by the friction of pin 23 in the slot 38) and the pressure exerted by the tooth 25 against face 40 will be about twenty pounds. Thus, lever 25 effects approxi mately a three to one reduction between the pressure exerted on lever 29 by bolt pin 23 and the pressure transmitted by lever 25 to detent 21. To disengage detent lever 27 from tooth 25 it is only necessary to overcome the frictional component of the twenty pounds force on the This disengaging force will depend on the smoothness and lubrication of faces 36 and E0, and will vary between four and eight pounds in accord with variations in these factors. As the door sealing pressure is increased up to a value of about three hundred pounds, it has been found by tests of the mechanism that the proportion of the transmitted force that is absorbed in friction increases rapidly so that the force required to release the detent lever 2'! does not increase in proportion. At two hundred pounds seal pressure it may increase to only seven to ten pounds.

In view of the above it is evident that our lock is admirably adapted for operation either from within or from without the vehicle body by a push button or trigger release. As shown in Fig. 3, the door 2 is provided with a fixed outside handle 45 having a cylindrical opening- 45 in which a push button 47 is arranged to slide inwardly and outwardly. Push button 4! is biased outwardly by compression spring 48. A conventional key controlled cylinder lock 59 is journalled in push button 5'! and is provided with a conventional locking bar 59 which normally slidably engages handle .55 in groove 5i extending longitudinally in the wall of cylinder 55. When a key is inserted in cylinder barrel 49, locking bar 59 can be retracted out of groove 5i and cylin der 49 turned in a conventional manner to rotate shank 52 which is integral with lock cylinder 43. A shank extension 53 is fixed in the end of shank 52 so that look cylinder 49, shank 52 and extension 53 rotate as a unit. A clamp 54 engages shank 52 in notches 55 and serves as a stop button for limiting outward movement of push button 41 and lock cylinder 59 under the'infiuence of spring 48 and clamp 54 also serves to retain the lock cylinder and push button assembly within cylinder opening 45. Thus, it will be noted that push button 41, lock cylinder 49 and

shank

52, 53, can be pushed inwardly and outwardly of cylindrical opening 36 as a unit and, in addition, lock cylinder 49 and

shank

52, 53, when a key 54 is inserted therein to retract tumbler 55 from groove 5!, can be rotated as a unit for purposes described below.

Our lock incorporates all the operative advantages of the lock shown in the And-erson-Bowlus Patent 2,039,873. For retracting the detent lever 21 from interengagement with either

tooth

24 or 25 by means of push button 41 there is provided a channel guide member 55 (Fig. 13) provided with an opening 5'! which receives pin 58 by means of which channel guide 55 is pivoted on lock frame I2 (Fig. 10). Channel member 56 is provided with a pair of side walls 59 having aligned openings 62 which receive pin 69 by means of which lever 5| is pivoted on channel guide 56. A hub 63 having a pair of spaced fingers 65 is journalled in look frame I2 as at 95. Hub 63 is provided with a rectangular opening G6 which receives shank 53 since shank 5.3 is of corresponding rectangular cross section, rotation of shank 53 will rotate hub 63. Channel 59 is provided with a finger 6': which is located between fingers E l so that rotation of hub 63 in one direction or the other will pivot channel 56 about pin 56. A slide 68 (Fig. M) is provided with an elongated opening 69 and shoulders 79 and 7 1. Slide bar 58 is slidably mounted in channel guide 56 and is retained therein by pin 58 so that slide bar 68 also pivots with channel 55.

A lever return type spring '72 has one arm thereof anchored in slide bar 65 as at it and the other end anchored on lock frame l2 as at M (Figs, 5, One end ie of slide bar 68 is turned outwardly to form a shoulder against which lever iii has an operative contact. The other end "it of slide bar 63 slidably engages lever Tl between channel lips 78. Lever ll is pivoted on frame 12 by pin 8 and is biased in one or the other of its positions by means of an over-center type spring ill which has one end anchored to lever El and the other end anchored to lock frame i2. Link 52 extends through an opening in garnish molding $55 and is provided with a finger piece 8 1. The lower end of link 82 is pivotally connected to lever TE as at 85. When finger piece Ed is raised, then lever l"! is swung to the position shown in Fig. 5 and slide bar 68 is raised or in'unlocked position so that shoulder ll will abut shoulder 56 on detent lever 2'1. Slide bar 68 and lever ll will be biased in raised position by over-center type spring 8!. If under such condition button M is pushed inwardly (Fig. 3), shank 5S willswing lever 6! clockwise (Figs. 3 and 10) thus causing slide bar 6% to slide toward the left (Fig. 10) and shoulder it will act through shoulder 85 to swingdetent lever 21 counterclockwise from the full line to the dotted line position 11, thereby releasing detent returns it to its normal position and spring 72 will return slide bar 58 to normal position, as shown in Figs. 5 and 9.

Since the lock is unlocked very easily and with a minimum of force by axial movement of shank which acts through lever 5! and slide bar to retract detent lever 2?, it is obvious that any conventional finger or manually operated conventional mechanism can be located on the outside of the door for shifting shank 53 axially. By way of illustration, a push button il' is shown for shifting shank 53 axially from without the door. This arrangement is preferred because the force applied on push button i? is directly transferred to shank 5-3 without the need for intermediate levers or links.

If piece 86 is pushed downwardly to swinglever Ti to the position shown in Fig. 9,

then slide bar {iii will be in locked or free-wheeling position so that shoulder H is free to slide by shoulder 85 without contacting the same, as indicated by the dotted lines in Fig. 9. If at this time push button ll is pushed inwardly, slide bar 68, which is now biased to locked position by spring 12, will simply slide freely by shoulder t5 and the push button ll will be ineffective to release detent lever 27 and lock bolt II will remain in raised locked condition (Fig. 9) and interengaged with striker3, as shown in Fig. 2.

avel cut of channel 1 of striker plate When push button 59 is released, spring A8 It is evident that if key 54 is inserted in look cylinder 49 so that looking bar 50 is retracted from groove 5|, then byturning key 54 clockwise, as viewed in Fig.,5,-hub t3 will be turned counterclockwise so that finger EA will contact finger G1 and swing channel 56 andslide 8 to raised or unlocked position, as shown in Fig. 5.

If key 54 is turned to rotate hub 63 clockwise (Fig. 9) then finger 64a, acting through finger 6i, will swing channel 56 and slide 68 down wardly to locked or free-wheeling position (Fig. 9) so thatpush button 4'! is now inefiective to retract detent lever 21..

For controlling slide bar 63 from withinthe vehicle we have provided a link 90 provided with an elongated opening '9! through which pin 28 end is pivotally connected to a lever 9! pivoted so that it is always inset from the outer face- 05 by pin 9,8 upon armrest 99 secured to the inside face of the door 2. Bell crank lever. 91 is operated by push button I00 slidably mounted in recess 16! in armrest 99. A pin Hi2 passes through stem I33 of push button lilo to retain the same in opening llll. A compression spring HM biases push button HIE} outwardly. Pin I02 limits the outward movement of push button. mo

of armrest 99 so that push button H39 cannot be accidentally struck to release detent lever 21. When the door'is opened or detent lever 2l is released from lever 26, lock bolt II, It will be in the position shown in Fig. 11 and bolt head it will be either in portion 1 of channel 5 or completely disengaged from striker channel 5. If the door is now swung shut, roller bolt II will travel up striker channel 8, as indicated by the arrow and dotted line showing Fig. 2. In travelling up striker channel (i, roller bolt II will be swung upwardly or counterclockwise, Figs. 11, 16, and safety tooth 24 will first cam detent lever counterclockwise until tooth '25 interchgages tooth 2t and at this time bolt ll will be in safety position (Fig. 16) and the roller head 15 will be in the lower end of vertical portion 8 of channel 6. If the door is forced further inwardly, roller bolt. end 16 will roll further up channel portion 8 of'striker 3 causing tooth 25 to cam detent lever 2'! upwardly or counterclockwise until tooth 26 interengages tooth 25 and the bolt is in fully locked position, Figs. 5, 1'7.

If, while bolt H is ,in released position and the door is open, Fig. 11, slide plate 68 is moved to locked position, Fig. 9, in the manner above explained, then as the door closes and bolt end it travels upwardly in striker channel 6, lever 2c will swing counterclockwise, Fig. 11, and tooth 2s will cam lever. 2? counterclockwise to the dotted line position shown in Fig. 11, whereupon shoulder H36 of lever 21 will contact shoulder ii! of slide bar 68 and

pivot slide bar

6, 8 from the locked position, shown in Fig. 9, to the unlocked position, shown in Figs. 5 and 15, so that shoulder ll will now contact shoulder if slide 63 is moved to the left.

If one wishes to lock the door without using key 5 5, as above-described, this can be accom- .plished by pushing finger piece Bidownwardly while the door is open which, as above explained, shifts slide bar 86 to locked or free-wheeling position, shownin Fig. 9. If the operator, while the door is still open, will now push inwardly on pushbutton 51, which acts through shank 53 and lever iii to shift slide bar 68 to the left or dotted line position shown in Fig. 9, then shoulder III will be to the left of shoulder I06 and as lever 21 is swung upwardly or counterclockwise by

teeth

25 and 25, shoulder I06 will not abut shoulder II! but will pass freely by shoulder I6 and consequently slide'bar 68 will remain in lowered or locked position, full line showing Fig. 9.- In-thus locking the door without the use of key 54 the operator, owing to this unusual procedure, will be reminded to first remove the ignition keys from the ignition lock.

Inasmuch as the sealing pressure in the modern automobile is considerable, as a practical matter the door will be closed by slamming the same shut. If the door is only closed to safety position (Fig. 16) while looking the same without a key, then the operator need merely release push button 4? and push on the door whereupon the action of the striker plate through bolt II and lever 20 will cause tooth 25 to cam lever 2'! upwardly which, as above explained, will raise slide bar 68 to unlocked position. The door can now be opened by pushing in on push button 4! and is now ready to be again closed and locked without a key, as above described. Thus, even if the door does close only to safety position, the operator still can fully close and lock the door without use of the key 54.

In the modified form of our invention bolt II cooperates with the same type of striker plate, as shown in Fig. 2. Bolt II is connected toa multiplier lever III! by means of pin IIIwhich slidably engages lever H in elongated slot H2. Lever H0 has a single tooth H3. Lever I II] is pivoted on lock frame I2. For holding the bolt in raised or locked position we have provided a safety detent lever I I pivoted on frame I2 by pin H6 and having a finger II! for interengagement with tooth face I I4- when bolt I6 is in safety position. A second detent lever H8 is pivoted on lever H5 by pin I I9. Coil spring I has one end anchored on pin H5 and the other end anchored to detent lever HB and biases lever H6 in a clockwise direction (Fig. 19). Detent lever H8 has finger I2I, the inside face I22 of which is arcuate as in the principal form of the invention. Face II 4 of tooth I I3 is also arcuate and faces II 4 and I22 are arcs having equal radii with their centers at the axial center of pin H9 about which detent H8 swings so that face I22 can be released from face H4 easily as described above with respect to the principal form of the invention.

A plate I23 is provided with an elongated slot I24 in which it slidably engages a stud I25 fixed on lever H5. Plate I23 is connected by link 96 with the inside push button as above described. Movement of plate I23 toward the left (Fig. 19) acts through stud I25 to swing detent lever H5 counterclockwise and at the same time detent I i8 is swung about pin 5 I6 as a center to thereby release tooth II 5 of lever IIB from finger I2I to thereby release lock bolt H. Detent lever I 2| has a finger- I26 which overlies edge I27 of lever H5 so that detent lever H8 will always swing bodily with lever H5. Lever H5 can be swung from without the vehicle by push button arrangement identical with that described above.

The shank 53 of the push button arrangement, however, acts upon a modified form of mechanism which comprises a lever I30 pivoted to swing about a vertical axis upon pin I 3I which is mounted upon two flanges I32 integral with lock plate I2. Flanges I32 also serve as a guide for one end of slide bar I33 and the other end of slide bar I33 is provided with an elongated opening I 34 for rivet pin I35 which is fixed to lock plate I2. A lever I36 is pivotally supported on bar I33 by rivet pin E31. Lever I36 has one end bifurcated as at I33. Bifurcated end I38 of lever I36 receives pawl I39 which is integra1 with hub I53 which in turn is rotated by shank 53 as in the principal form of the invention. Lever I36 has a shoulder I iI which is arranged to cooperate with shoulder I42 turned out of lever H5. Left hand end I64 of lever I36 is mounted between outwardly turned fingers I45 on lever I46 pivoted by pin I35 upon plate I2. Spring I41 has one end anchored on pin I35 and the other end anchored to lever I 56 between fingers I55 so that spring I47 acts as an over-center spring to bias levers I46 and I36 in either locked or unlocked position. Lever I 46 can be actuated by a finger piece in the garnish molding through a link 82 in the same manner as described above for the principal form of the invention.

When lever I 36 is in unlocked postion, as shown in Fig. 19, with shoulder I 4| abutting shoulder I42 of lever H5, the detent lever II 5 can be released either by operation of the inside push button I55 or the outside push button 41. Further, lever I36 can be set in locked or unlocked position either from the inside by operation of the finger piece 84 or from the outside by turning key 515 which acts through shank 53 and pawl I35 and bifurcated end I38 of lever I36 to swing it to either locked or unlocked position. Detent lever H5 has a pin I56 fixed thereon which projects into opening I5I in lever I I 5. The upper edge of opening I5I is sinuous and comprises humps I52 and I53 and valleys I54 and I55. Lever H5 also has a lug I55 struck inwardly toward plate I2 at right angles to the general plane of lever H5. Lug I56 is located so that when lever I36 is in lowered or free-wheeling position the lower edge I 51 abuts the upper edge of lug I56. Hence, if lever I36'is in lowered or locked position (Fig. 20), when the vehicle door is open and bolt II is in lowered position, then upon closing the door the striker plate swings bolt II upwardly which, through pin I I I, rotates lever H6 counterclockwise and pin I 50 on lever H0 slida'bly engages hump I52 and swings lever H5 upwardly or counterclockwise which, through lug I56, acts against lower edge I5! of lever I36 to return lever I36 to unlocked position (Fig. 19').

This lock can be locked without the use of key 54 in the same manner as above described. Here again if, while looking the door without the key, the door should engage the striker in safety position, then, as shown in Fig. 23, pin I50 will be located in recess I54. Here again the operator simply releases push button 51, pushes inwardly on the door and pin I50 will cooperate with hump I53 to pivot lever I I5 and thereby raise or swing lever I35 to unlocked position so that the door can be reopened, the lock reset to locked position by pressing down on finger piece 84, and then swung shut while holding push button 41 inwardly. In this condition, as bolt I 6 rides up the striker, lug I56 misses the right hand end of edge I51 of lever I 36 and simply swings freely upwardly in corner I58 without resetting lever I36 to unlocked position.

We claim:

1. In a door lock, a bolt shiftable from unlocked position to locked position and from locked position to unlocked position, a detent, and a lever having one arm operativelyassociated with said lock bolt so that movement of said lock bolt swings said lever about its fulcrum, a spring urging said detent toward said lever, the other arm of said lever having a tooth provided with a cam surface, movement of said lock bolt from unlocked to locked position causing said cam surface to cam said detent outwardly until saidcam surface clear-s said detent whereupon said spring moves said detent into interengaged relation with said tooth and said detent acts through said lever to retain the bolt in locked position, the first. mentioned arm of said lever being shorter than the second mentioned arm whereby any force exerted by said bolt in an unlocking direction against said first mentioned lever arm produces a substantially lesser force actin through said longer arm against said detent.

2. In a door lock, a lock frame, a bolt pivotally mounted on said frame and shiftable from unlocked position to locked position and from locked position to unlocked position, a detent pivotally mounted on said frame, a lever pivoted on said frame having arms of unequal length, said detent being swingable into and out of interengagement with said lever, a spring urging said detent toward said lever, an operative contact between the shorter arm of said lever and the bolt, said pivotal connection being located radially outwardly from the axis of said lever, whereby shifting of said bolt causes said lever to pivot about its fulcrum, the other arm of said lever having a tooth provided with a cam surface, the shifting of said bolt from unlocked to locked position causing said cam surface to cam said detent outwardly until said cam surface clears said detent whereupon said spring moves said detent into interengaged relation with said tooth whereby the detent blocks return shifting of the bolt to unlocked position.

The combination as set forth in claim 2 wherein the fulcrum of the bell crank lever is positioned between the pivot of the bolt and the contact between the short arm of the lever and the bolt.

4. In a door latch comprising a lock frame and a movable latch member thereon, means for releasing said member comprising a channel guide member pivoted on said frame to swing into ient means acting on said bar for retracting the same.

6. Ina latch mechanism for a swinging door, a frame, a latch member pivotally mounted on said frame and movable into latched position for holding the door closed and movable to released position to permit opening the door, a guide member pivoted on said frame to swing into either of two positions about an axis substantially perpendicular to the plane of said frame, a bar mounted on, and guided by, said guide to pivot with said guide and to shift longitudinally on said guide, said bar having an operative contact with said latch member in the first of said positions of said channel guide and being'operatively out of contact with said latch member i'n'the second position of said channel guide, a lever pivotally mounted on said guide to "swing about an axis substantially perpendicular to the axis of pivoting of said guide, said lever having an operative contact with said bar whereby when the"lever; i's swung about its pivot on said guide the'bar bodily shifts said bar along said guide to release said latch member when the guide is in its first position, said bar beingineifective upon longitudinal movement to release said latch member when the guide is pivoted to its second position, and manually operable means for swinging said guide about its axis into one or the other of said positions.

7. The latch defined in claim 6 including a push member manually operable from without the door and shiftable in a direction parallel to the axis of pivoting of said guide member for swinging said lever to thereby shift said bar,

8. The latch defined in claim '7 including a hub journalled in said frame to swing about an axis parallel to the axis of pivoting of said guide and having an operative contact with said guide whereby turning of said hub pivots the guide to one or the other of its positions.

9. The latch defined in claim 8 wherein said hub is provided with an axial opening, said push member passing through said axial opening and being axially slidable therein and having an operative contact with said lever whereby said push member can be actuated to pivot said lever about its axis and project said bar, a driving contact between said push member and hub whereby turneither of two positions, said channel guide having side walls, a lever pivoted on the side walls of said guide to swing about an axis transverse of the axis about which said guide swings, a bar mounted upon, and guided for longitudinal movement along said channel guide, said bar having an operative contact with said latch member in the first of said positions of said channel guide ing of said push member pivots said guide to one or the other of its said positions.

10. In a door latch comprising a latch fram and a retractable latching member, a channel guide having a bottom and side walls, a pin pivotally interconnecting the latch frame and the bottom wall of said channel guide with the side walls of the channel positioned in'a plane substantially perpendicular to that of the latch frame, a lever, a pin mounted on the side walls of said channel guide for pivotally supporting the lever on said channel guide to swing about an axis substantially perpendicular to the axis about which the channel guide member swings, a bar mounted upon and guided for longitudinal movement along said channel guide, said lever having an operative contact with one end of said bar whereby pivoting of said lever in one direction projects said bar, resilient means acting upon and tending at all times to retract said bar and lever, and means for swinging said channel guide member and bar to operative and inoperative positions, said guide bar when in operative'position having an operative contact with said latching member whereby projecting movement of the bar retracts said latching member, said latch bar 11 V when in inoperative position being out of opera-' tive contact with said latching member whereby projecting movement of the bar is ineffective to retract the latching member.

11. The latch defined in claim 10 including a hub journalled on said frame to swing about an axis parallel to the axis of pivoting of said guide, cooperating fingers on said channel guide and hub whereby turning of the hub pivots the guide to operative or inoperative position.

12. The latch defined in claim 11 wherein the hub is provided with an axial opening, a push member passing through said axial opening in the hub and being axially slidable therein, said push member having a driving contact with said 15 Refrehces Cited in the file of this patent UNITED STATES PATENTS Number Name Date Blosick Nov. 23, 1915 Jarecki June 26, 1928 Wells Dec. 3,1929 Simpson 1 Mar. 2, 1937 Schonitzer Sept. 28, 1937 Ruegg Oct. 11, 1938 Springer Oct. 15, 1940 Lakin Feb. 11, 1941 Simpson Mar. 11, 1941 Roethel May 15, 1951