US2609679A

US2609679A - Safe lock

Info

Publication number: US2609679A
Application number: US106214A
Authority: US
Inventors: Frederick J Bremer; George J Bauer
Original assignee: Mosler Safe Co
Current assignee: Mosler Safe Co
Priority date: 1949-07-22
Filing date: 1949-07-22
Publication date: 1952-09-09
Anticipated expiration: 1969-09-09

Description

Sept. 9; 1952 F..J. BREMER ETAL ,609,679

SAFE LOCK Filed July 22, 1949 2 SHEETS-Sl-IEET I.

i INVENIOR.

FREDERICK J. BREMER BY GEORGE d. BAUER p 1952v F. J. BREMER ETAL 2,609,679

SAFE LOCK Filed July 22, 1949 U 2 SHEETS SHEET 2 INVENTOR. FREpER/c/r J BREMER BY GEORGE d. BAUER Patented Sept. 9, 1952 sAFE LOCK Frederick J. Bremen Hamilton, and George Bauer, Cincinnati, Ohio, assignors to The Mosler Safe Company, Hamilton, Ohio, 2.- cor poration of New York Application July 22, 1949, Serial Nb. 106,214

(on. "ac-1.5)

This invention relates to safe locks and more particularly to key locks for safes.

Ordinarily, safes are provided with combi nation locks. Such locks are usually mounted on or near the inner faces of the safe doors and are opened and closed from the front of the door by a knob which is part of the coin-*- bination mechanism; Safe doors usually are heavy and thick which makes the use of a key for opening or closing a safe lock located deep in or on the inside face of the door, impractical because of the long key that would be required.

An object of this invention is to provide a lo .1 and lock mechanism for safes whichare so designed that a relatively short key may be employed for actuating the mechanism to open or close the lock. H v

Another object of the invention is to provide a key-actuated key lock that will be substantially pick-proof and capable of withstanding unauthorized openings of the look by demolition tactics.

A further object of the invention is to provide a key-actuated safe lock and lock mechanism that comprises a lock adapted for mounting on the inside face of the door, a lock mounted on the outside face of the door and a driving con nection between the mechanisms of the inner and outer locks controlled by a key insertable' in the outer lock.

A still further objectof the invention is to provide a key-actuated look as above set forth, which shall be so constructed that the driving connection is rendered inoperative to actuate the inner lock mechanism in the event the outer lock is knocked oh the safe door.

still further object of the invention is toprovide a key-actuated lock, as above set forth,

in which the actuating mechanism of the belt of the inner lock is locked in closed position when the driving connection between the inner and outer locks is broken.

And a still further objectof the invention is to provide a safe lock of the character set forth above, provided with means which are inaccessible through the door for further securingthe inner lock bolt in locked position wherithe bolt actuating mechanism is knocked off the inner face of the door.

The foregoing and other objects'of the mvention will be apparent to those skilled in this art, from the following description and the drawings, in which: I

Figure 1 is a fragmentary view in horizontal section of a safe door and a horizontal section of a safe lock mounted on the door and as:

ranged constructed in accordance with an embodiment of the invention;

Fig. 2 is a View in front elevation of the lock mechanism of the outer lock illustrated in Fig. l, the tumblers of the lock being shown in full lines corresponding to the open position of the lock and in dotted lines to indicate the locked position thereof;

Fig. 3 is a view similar t6 Fig. tumblers removed;

Figs. 4 and 5 are front views of the keyactuated drive mechanism of the .outer l'o'ck showing the inotion of the parts wh'en'moving from closed to open position;

Figs. 6, 7 and 8 are end views of the lock mechanismof the inner lock. with the housing removed and illustrating the motions of the bolt actuating mechanism whilethe bolt moves from the open or unlocked position of Fig. 6 to the locked or closed position of Fig. 8. Y

Fig. 9 is a View similar to Fig. 8, showing two safety lock features for the bolt which become operative in sequence, first, when the outer lock has been knocked off the door, and second, when the inner lock housing and the actuating mechanism for the bolt have been knocked on the innerdoo'r Fig 10 is a View in section takeii on line X'--'X of Fig. 9; and

Fig.- IL is' a fragmentary view in section of a safe door, provided with an; inner look, as shown in Fig; 1, and outer cylinder lock, the latter being in section.

Figure-1 of the drawings we have illustrated what now appears to be a preferred form of the key safe lock" embedying a form of the invention; The safe loch is shown mounted. on a safe door. The door is shown as having spaced outer and inner walls 2 and 3 made of alloy steel of the type commonly employed in safe doors.

The lock mechanism comprises outer lock 4, aninner lock 5 and a driving connection oi spindle 6 operatively connected to the lock mechanisms of the inner and outer looks. The inner lock is provided with sliding or rcip'ro eating bolt 1 adapted to be moved into or out of a lock keeper (not shown) that would be mounted in the safe door frame (not shown);

The safe lock is actuated by a key I? which is inserted in a slotted key cylinder 9" inthe outer lock. The key cylinder can be turned in one direction or the other to open or' close the locla The outer lock comprises a housing lil" of cup shape having: a? flange II by" means of which 2 with the is provided with a bearing sleeve aeoave 3 the housing may be secured to the safe door by means of suitable bolts l2. The housing IE3 is closed by means of a plate [3 which rests against the outer face of the door and which 14 integral therewith. The bearing sleeve i4 extends through the outer wall 2 of the door and forms a journal or bearing for spindle 6. Plate i3 is secured to the cup ID by means of screws which are threaded into the bosses i5 integral with the inner wall of the cup. Within the housing It is disposed the lock actuating mechanism through which spindle 6 may be turned by key 8 to operate the slide bolt 1. Plate [3 is provided with integral heavy pins i3 that extend into suitable apertures in the front wall 2. The function of pins I3 is to prevent turn ing of the outer lock, after removal of screws l2, in an attempt to open the inner lock. The

outer lock housing I0, plate i3, pins i3 and I sleeve M are made of file, drill and saw resistant alloy steel to prevent unauthorized removal thereof from the door except by demolition tactics.

The mechanism in the outer lock comprises a member H which is given a linear motion by the'rotary motion of the key cylinder 9, and member I1 converts its linear motion into rotary motion of spindle 6. Member l'i may be in the form of a Scotch yoke and is mounted in the housing so as to be moved with reciprocating motion vertically or at any other suitable angle. For convenience, it is shown mounted for horizontal reciprocating motion in housing Ill. 1

Member ll is provided with a slot 18 disposed transversely to the line of motion thereof and in which a crank pin 19 is disposed. Crank pin i9 is secured to a crank 28 attached to the outer end of spindle 6. The yoke I? is guided at its opposite horizontal edges in slide bearings and 22, bearing 21 being provided with a pin" 23 having a head 24 overlying the edge of the-yoke so as to hold it on its bearing. Yoke I! is also guided by a post 25 secured to plate i3 and extending through a horizontal slot 26 in the yoke. Yoke I! may be reciprocated by a cam 2'! carried by the inner end of key cylinder 9. The key cylinder 9 is provided with a slot '28 extending longitudinally thereof and which opens through one side thereof to allow the teeth and notches of the key to engage a series of lock tumblers 29. When key 8 is turned clockwise (assuming the lock bolt 1 of the inner look to be in open position) spindle 6 is turned clockwise whereby the bolt-actuating mechanism of the inner lock is operated to closed position. When the key is turned clockwise as seen in Figure 1, the yokeis moved to the left in a horizontal direction causing crank pin I9 to move towards a horizontal plane passing through the center line of spindle 6 whereby crank 29 is turned clockwise. Turning of the key in the opposite direction moves the yoke to the right; causing spindle 6 to turn counterclockwise to unlock the lock bolt 1. As shown in Fig. 1, the inner end of the key cylinder 9 is journaled in a socket in the outer end of spindle 6 and the outer end of the cylinder is journaled in an opening in the front wall of housing cup [0. As shown by. Figs. 2 to 5 inclusive, cam 21 of the key cylinder 9, when rotated, enters a notch 30 in yoke ll. When the cam 27 is in this notch and it is turned either clockwise or counterclockwise the yoke [l is moved either to the left or the right. The yoke is cut away on both sides of the notch 30 to provide clearance for the cam when it is turned to its extreme positions through an arc of 180 degrees. Thus there is provided a certain travel of the key cylinder cam 27 during the initial turning of the key from either open or closed position before it actuates yoke H, to allow time for the key to pre-position the tumblers 29. The yoke I! is provided with afencetl that projects outwardly from the outer face of the yoke, the fence being located near the left hand edge of the yoke.

,The fence 3| and the tumblers 29 form a lock for the actuating mechanism of spindle 6. When yoke H is in the dotted line position indicated in Fig. 2, fence 3| is disposed adjacent the free a key 50'.

ends of'tumblers 29. When the key has been turned counterclockwise through the portion of itsstroke preceding entry of cam 27 into notch 36, the tumblers shift downwardly to the positions where an unobstructed horizontal gate 32 is formed by the tumblers which allows the fence 3| to move through it as the key is turned to unlock the lock bolt 1. Each of the tumblers, it will be understood, is provided with a horizontal gate and that when the lock is locked these gates are out of alignment, but when the key is turned to unlock or open the lock, the tumblers are so shifted that they are moved into alignment. When the key has been turned to the full open position which is that corresponding to the dotted lines of Fig. 5, the tumblers move upwardly to position the fence in a vertical notch 32 in the tumblers.

-As shown in Fig. 2, the tumblers are pivotally mounted at their right hand ends on a post 35,

the post being secured to plate it. Each tumbler to the inner face of the inner wall 3 of the safe door and provided with a flange 39 in which the lock bolt 1 is guided there being an opening in this flange accommodating the bolt. As shown, the forward end 40 of bolt 1 is relative-,

- ly heavy and thick. Extending rearwardly from the heavy section 48 is a relatively thin plate section 4|.- This section is provided with an elongated slot 42 through which extends a bushing43 in which the inner end of the spindle B is journaled. Portion 4| of the bolt is guided on a screw or pin 44 having a head which forms a retaining flange for .the lower edge of portion 45. On the innerend of spindle 6 is secured a cam 41 having a notch 48 in the edge thereof which co-acts with a bell crank 49 arranged to move the slide bolt 1 to or from locked position. The cam 41 is provided with a threaded hub 50 whereby it may be threaded onto the inner end of spindle 6 and locked in position by Between the cam 4! and the bushing 43 a compression spring 5| is mounted which tends to urge cam to the right as seen in Fig. 1. This spring is provided to disengage cam 4 from the bell crank 49 in the event the outer lock mechanism 4 is knocked off the front of the safe door and the spindle B is fractured at a point between the outer and inner walls of the door. When spindle 6 is unbroken, inward movement thereof is prevented by the hub of crank 28 whichabuts plate l3 asshown in Fig.

1. To make certain that the spindle will fracture under such circumstances, it is provided with a neck portion 53 of reduced area or cross section. When the spindle is fractured at neck 53, cam 4'! and the portion of spindle 5 to the right of the neck 53 move laterally to the dotted line position indicated in Fig. 1. In this position the portion of the spindle connected to cam 41 is rendered inaccessible to a tool that someone might try to use to turn the spindle.

As shown in Figs. 6 to 10 inclusive, bell crank 49 is pivotally mounted on a pin or screw 55 secured to plate 33. The slide bolt 1 is provided with an elongated opening 56 to accommodate the pin 55 and permit reciprocating motion of the slide bolt. One arm of the bell crank is disposed between a lug 51 and theheav'y portion 40 of the slide bolt 1 so that as the crank turns counterclockwise, as seen in views 6 to 9 inelusive, the bolt moves to the left and when turned clockwise the bolt slides to the right. The other arm of the bell crank is disposed to ride on the periphery of the cam 41 and to drop 6. crank 49 and flange 39 of plate 38. When the cover is in place lock 14 is held fiatwise against plate 38 by a pin 15 secured to cover H.

If the look bolt 1 is in locked position, that is, in the position shown in Figs. 7, 8, and 9, and an attempt is made to open the inner look after the outer lock has been knocked off the door, and the spindle has been fractured, as by inserting a drive pin through the holes in the door and a hammer blow is struck on the pin while in engagement with spindle 6, the cover or housing H and its access plate 13 will be driven off the door. the rivet heads of the se curing pins being sheared. When this happens plate 38 will remainsecured to the door. Since the lock boltis secured to the plate 38 it will not be knocked 01f the door. However, as soon i as the housing is knocked off the inner lock.

into notch 48 as the cam is turned, so that the bell crank may be turned in one direction or the other, as shown. In order that the bell crank may be made to follow and remain in contact with the cam 41, a pin 58 is mounted in a socket 58 in the heavy portion of the bolt behind which is a compression spring 59. This spring urges the pin into contact with the bell crank arm between lug 5i and the heavy por tion of the bolt. Views 6,- 7 and 8 indicate the motion of the cam, bell crank, and slide bolt 1 when key 8 is turned to move the bolt into locked position. The sequence of motion of these parts, when the bolt is moved from locked to open position, is represented by Figs. 8, 7, and 6, respectively.

In order to further guard against manipulation of spindle 6 after it has been fractured, in an attemptto move the lock bolt 1 to open position, a pawl 65 is provided. Pawl 60 is disposed above the slide bolt portion 4| and is provided with a pin 6! that normally rides on the periphcry of cam 4'! and holds the pawl out of engagement with the slide bolt portion 41. Pawl 60 is pivotally mounted on a pin 52 and is urged in a direction towards the slide bolt and cam 41 by means of a spring 53. The bolt portion 4| is provided with a notch or shoulder 64 so located that when the slide bolt 1 is in locked position this notch or shoulder is under the free end of the pawl Bil. Thus, when the cam 41 is moved to the dotted line position of Fig. 1, in response to severance of spindle 6, the pawl 60 moves into position to engage the notch or shoulder 64 so as to hold the bolt in locked position, thus preventing manipulation of bolt 1 by means of tools inserted through the openings in the door walls 2 and 3, through which the sleeve bearing 14 and the spindle 6 extend.

The mechanism of the inner lock 5, above described, is ordinarily enclosed by a cover or housing H which is secured to the plate 38 by means of rivets 12. The inner ends of these rivets are secured to plate 38 and the outer ends are peened over the outer face of the cover. The cover is provided with an access opening which normally is closed by a plate '13, whereby the cam 41 may be threaded onto the spindle 6 in the assembly of the lock, or, whereby it may be adjusted or removed if the lock requires servicing. When the lock housing H is in place it engages an additional safety lock 14 which is mounted'on plate 38 at a location betweenbell lock [4 springs outwardly from the plate 38 and engages a lug 11 on the slide bolt. This lock is diflicult, if not impossible to reach, thereby insuring that the slide bolt will remain in closed position even though manipulating tools successfully disengage pawl Ell from the bolt. The relative positions of the lock 14 and the lug, 11 after the housing H has been knocked off the inner face of the door, are indicated in Fig. 10.

To summarize: assuming that the safe lock is locked, tumblers 29 willbe in the full line positions shown in Fig. 2, and the yoke will be in the position shown in Fig. 4. As key 8 is turned counter-clockwise, the tumblers are shifted downwardly as shown in Fig. 2, and the keycrank 21 moves as indicated by Figs. 4, 3

3 and '5, whereby the yoke I1 is moved to its full open position indicated by Fig. 5. When the camis turned to the dotted line position of Fig. 5, the key will have been turned 180 degrees from its initial starting position and fence 3! will. come to rest in the lateral notches 32 of the tumblers 29.

To look the safe look, the key is turned to move the key cam 21 from the dotted line position of Fig. 5 to the full line position of Fig. 4.

, In this position the tumblers turn clockwise about the pivot pin 35 and the tumbler gates are out of alignment, so that on removal of the key from the key cylinder 9 the lock can not be opened.

While we have indicated a single key lock for the outer lock, it will be apparent that this look may be designed to require a plurality of access keys, so that more than one individual must be present to open the look. It will also be apparent that instead of employing a Scotch yoke mechanism for turning spindle 6 and a fiat type tumbler lock therefor, we may also employ a cylinder type outer lock to provide a driving connection between the key and the spindle 6 to actuate the inner lock. Such an arrangement is shown in Fig. 11. l p

In Fig. 11, the inner and outer walls of the safe docr are indicated by reference characters and ti, the space between them being filled with a grouting 32. A look 5 such as shown in the preceding views, is secured to the inner face of the door and a cylinder lock 83 is mounted on the front of the door to provide a driving connection between the key 84 and spindle 6'. The lock 83 is illustrated as being of the paracentric key-cylinder type.

Spindle 6' is like spindle 6 except that it does not have a crank corresponding to crank 20. Spindle 6' extends through a sleeve 85 located in the space between doorwalls 80 and 8| and secured thereto. The outer 'end of the spindle is 7-. provided with a shouldered socket .86 into which is received a correspondingly shaped end '8'! of key-cylinder 88. V

Look 83 comprises a flanged cup-shaped housing 89 secured to the outer doorwall by screws or other suitable means, the key-cylinder 88 and a stationary cylinder 90 secured by a set screw 9|, and tumblers 92 to 95 and 96 to 99 disposed in sockets in the stationary and key cylinders 88 and 90, respectively; These tumblers operate against compression springs'IUIl as shown. The forward end of the'key-cylinder is provided with a flange IBI abutting the stationary cylinder, and the inner end is threaded and'provided with a nut I02 that abuts the inner end of the stationary cylinder, thus looking the key cylinder in the stationary cylinder. The key cylinder is provided with a key slot I03 which opens outwardly to provide access for thekey 84 through an opening I04 in the housing.

The open side of housing 89 is closed by a plate tilt secured inplace by screws I01. Plate I96 may be provided with one'or more hardened steel alloy pins I98 that extend through suitable openings in the outer wall 8| for locating theouter lock in a desired position and preventing turning thereof for the purpose of opening the inner lock. Theouter lock housing, plate I06 and pins IE8 are made of hardened steel alloy of a character to resist files, saws. drills and other or'similar tools employed by safecrackers.

The lock shown in Fig. 11,'operates in substantially the same manner as the lock disclosed by Figs. 1 to 10. The inner lock may be assumed to beidentical, thedifl erence being in the type of lock employed'as the outer lock. When key 84 is inserted as shown in Fig. 11, the tumblers are so positioned that the key cylinder is free and can be turned by the key. When the lock is in locked position and thekey is removed, the tumblers in the stationary cylinder move partially into the key cylinder and prevent turning thereof by means other than the appropriate key.

If the outer lock is knocked off the door with a sledge hammer, for example, spindle 6 will fracture at its neck 53' as in the case of spindle 9 in Fig. 1, whereby the portion of the spindle attached to the inner lock is projected into the in her wall of the door, rendering it inaccessible to turning tools. it a drive pin is placed against the inner portion of the spindle in an attempt to knock the inner lock off, the bolt 7 will be held in locked position by the safety locks described in connection with Figs. 6 to 10 inclusive.

Having thus described the invention, it will be apparent to those skilled in this art, that various modifications and changes may be made without departing from either the scope or the spirit of the invention as set forth in the appended claims.

What we claim as new and desire to secure by Letters Patent is:

1. A key lock for a safe door having a closed hollow space between the inner and outer faces thereof, said lock comprising a housing adapted for mounting on the outer face of the door, a'key lock in said outer housing, a lock adapted for mounting on the inner face of the door having a bolt adapted for actuation into and out of a lock keeper, a spindle adapted to extend from the interior of the exterior housing through said door into the lock on the inner door face, means providing a driving connection between the inner end portion of said spindle and said bolt, said lock in the outer housing being disposed when unlocked by a key to effect a driving connection between said key inserted into said outer lock and said' pindle whereby upon turning the key the inner lock may be opened and closed by the driving connection effected through said outer lock and spindle, said spindle having a reduced area fracture section adapted to "be normally located in said hollow space, and means responsiveto fracture of said section for disengaging the driving connection between the inner portion of said spindle and said inner lock. 7 v

2. A look according to claim 1 characterized by the fact that means responsive to the breaking of said spindle are provided foraotuating the portion of the spindle connected to said inner lock inwardly towards said inner lock, and that means'are provided for enclosing the fractured end of the portion of the spindle connected to said inner look when actuated inwardly in response to fracture to render the same inaccessible to tools intended for turning said portion of the spindle.

3. A key lock for a safe door comprising a housing adapted for mounting on the outer face of the door, a key lock in said outer housing, a lock adapted for mounting on the inner face of the door having a bolt adapted for actuation into and out of a lock keeper, a spindle adapted to extend from the interior of said exterior'housing through said door into the lock on the inner door face,'mechanism connecting the inner end portion of aid spindle and said bolt for actuating the same into and out of locking position in response to turning of the spindle, said spindle being rovided at a location between said inner and outer looks with a necked portion at which said spindle breaks when the outer lock housing is knocked off the safe door, thereby severing the driving connection between said outer lock and the portion of the spindle extending inwardly from said necked portion into said inner lock, and means responsive to the breaking of said spindle for disconnecting the inner portion of the spindle from the bolt-actuating mechanism of the inner lock to thereby prevent actuation of said bolt from locked to unlocked position, said lock in the outer housing being disposed when unlocked by a key to effect a driving connection between said key inserted into said outer lock and said spindle, whereby upon turning the key the inner lock may be opened and closed by the driving connection effected through said outer lock and spindle.

4. A safe lock comprising an inner lock having a sliding bolt therein adapted for mounting onthe inside face of a safe door, an outer lock disposed for mounting on the outer faceof said door, a spindle adapted to extend through the said door, the inner end of said spindle having a driving connection with thesliding bolt of said inner lock, said outer lock including means adapted to be actuated by a key inserted therein for estab-' lishing a driving connection in' the outer lock between said key and spindle when said key is turned to open or close said inner lock, means for locking the spindle driving connection between the outer and inner looks when the key ha been turned to the position in which the bolt of the inner lock has been turned to locked position and means for disestablishing the driving connection between the inner end of said spindle and said sliding bolt in response to fracture of the spindle that results when the outer look is knocked off the door.

5. A safe lock comprising an inner lock having a sliding bolt therein adapted for mounting on the inside face of a safe door, an outer lock dis- -9 posed for mountingon the outer face'of said door, a spindle adapted to extend through the said door, the inner end ofsaid spindle having a driving connection with thesliding bolt of said inner look, a drlvi'ng'connection in the outer lock between the key and the outer endof the spindle comprising a Scotch yoke mounted for linear reciprocating movement and having a crank pin slot extending transversely to the line of motion thereof, a crank on said spindle havinga crank pin extending into said slot, and arotatable member having a key slot therein and a cam dis posed on said rotatable member to reciprocate said yoke in response to rotation of saidrotatable member by'a key inserted in saidslot, said outer lock including means adapted to be actuated by a key inserted in'said key slot for looking or unlocking said yoke whereby the driving connection in the outer lock is established through said key, yoke and spindle when said key is turned to openor close said inner lock.

6. A safe lock comprising an innerlock having a sliding bolt therein 'adaptedfor' mounting on the inside face of a safe door, an outer lock disposed for mountingon'the outer face of said door, a spindle adapted to extend through the said door, the inner end of said spindle having a driving connection with thesliding bolt of said inner look, a driving connection in the outer lock between the key and the spindle comprising a gcotch yoke mounted for linear reciprocating movement and having a crank pin slot extending transversely to the line of motion thereof, a crank on said spindle having a crank in extending into said slot, a rotatable member havment after said key has been turned to closed position in which position the fence is in abutment with said tumblers to lock said yoke.

'7. A safe lock comprising an inner lock having a sliding bolt therein adapted for mounting on the inside face of a safe door, an outer lock disposed for mounting on the outer face of said door, a spindle adapted to extend through the said door, the inner end of said spindle having a driving connection with the Sliding bolt of said inner look, a driving connection in the outer lock between the key and the spindle comprising a Scotch yoke mounted for linear reciprocating movement and having a crank pin slot extending transversely to the line of motion thereof, a crank on said spindle having a crank pin extending into said slot, a rotatable member having a key slot therein and a cam mounted thereon and actuated thereby, disposed to reciprocate said yoke in response to rotation thereof, a fence on said yoke, said outer lock including a plurality of tumblers each provided with a gate adapted to be aligned by said key to provide a passageway for said fence, said key having means to adjust said tumblers to align said gates as the key is turned from closed towards open position whereby the yoke may move linearly and turn said crank and spindle, said tumblers being urged to positions in which said gates are out of align- 10 ment when the key has been turned to closed position in which position the fence is blocked by said tumblers against movement and locks the yoke, and a housing inclosing the outer lock mechanism, the outer end of said rotatable member containingthe key slot being journalled in a wall of saidhousing and accessible to said key.

8. A safe lock according to claim 4; character izediby the fact that the, inner lock includes means for locking said bolt in locked position in response to the disestablishment of the driving ccnnectionbetween said spindle and said bolt.

7 9. A safe lock comprising outer and inner locks adapted for mounting on the outer and inner faces, respectively, of a safe door, a driving spindle for said locks adapted to extend through said door with the respective opposite ends thereor disposed within the outer and inner locks, respectivcly, said spindle having a reduced area fracture section located between said locks, an

m n the ortio o the r nd ein the outer lock for preventing the portionof the spindle located inwardly of the fracture section from moving inwardly of the door while the fracture section is unbroken, said inner lock having a base plateadapted to be secured to the inside, face of the safe door, a bolt slidably mounted on said base plate, a cam adjacent said bolt and secured to the inner end of said spindle, a bell crank pivotally, mounted on said base plate and having one arm connected to said bolt to reciprocate the same, the other arm of said crank being disposed for actuation by said cam whereby on turning the camthe bell crank is turned and the bolt actuated to andfromlocking posit o a i g exerting a o ce on sa d cam spindle in adirection to disengage said earn from the bell crank and to shift inwardly of the door the portion of the spindle located inwardly of the fracture section in response to fracture of the spindle at said fracture section, a locking pawl pivotally mounted on said base plate and riding on said cam, said bolt having a notch in which said pawl is received to lock said bolt when the cam is disengaged from said bell crank in response to fracture of the spindle, said outer lock including means adapted to be actuated by a key inserted therein for establishing in the outer lock a driving connection between said key and spindle when said spindle is turned by the key to open or close said inner lock.

10. A safe lock comprising outer and inner locks adapted for mounting on the outer and inner faces, respectively, of a safe door, a driving spindle for said locks adapted to extend through said door with the respective opposite ends thereof disposed within the outer and inner locks, respectively, said spindle having a reduced area fracture section located between said locks, an abutment on the portion of the spindle in the outer lock for preventing the portion of the spindle located inwardly of the fracture section from moving inwardly of the door while the fracture section is unbroken, said inner lock having a base plate adapted to be secured to the inside face of the safe door, a bolt slidably mounted on said base plate, a cam adjacent said bolt and secured to the inner end of said spindle, a bell crank pivotally mounted on said base plate and having one arm connected to said bolt to, reciprocate the same, the other arm of said crank being disposed for actuation by said cam whereby on turning the cam the bell crank is turned and the bolt actuated to and from looking position, means exerting a force on said cam and spindle in a direction to disengage said cam from the bell crank and to shift inwardly of the door the portion of the spindle located inwardly of the fracture section in response to fracture of the spindle atsaid fracture section, a locking pawl pivotally mounted on said base plate and riding on said cam, said bolt having a notch in which said pawl is received to lock said bolt when the cam is disengaged from said bell crank in response to fracture of the spindle, a housing for said inner lock secured to said base plate, a locking member normally held in non-locking position by said housing and adapted to be released to engage and lock said bolt when the housing is knocked off said plate, said outer lock including means adapted to be actuated by a key inserted therein for establishing in the outer look a driving connection between said key and spindle when said spindle is turned by the key to open or close said inner lock.

11. A safe lock comprising outer and inner locks adapted for mounting on the outer and inner faces, respectively, of a safe door, a driving spindle for said locks adapted to extend through said door with the respective opposite ends thereof disposed within the outerand inner locks, respectively, said spindle having a reduced area fracture section located between said locks, an abutment on the portion'of the spindle in the outer lock for preventing the portion of the spindle located inwardly of the fracture section from moving inwardly of the door while the fracture section is unbroken, said inner lock having a base plate adapted to be secured to the inside face of the safe door, .a bolt slidably mounted on said base plate, a lock lug on said bolt, a cam adjacent said bolt and secured to the inner end of said spindle, a bell crank pivotally mounted on said base plate and having one arm connected to said bolt to reciprocate the same,

12 the other arm of said crank being disposed for actuation by said cam whereby on turning the cam; the bell crank is turned and the bolt actuated to and from looking position, a compression spring between said cam and said plate exerting a force on said cam and spindle in a direction to disengage said cam from the bell crank and to shift inwardly of the door the portion of the spindle located inwardly of the fracture section in response to fracture of the spindle at said fracture section, a locking pawl pivotally mounted on said base plate and riding on said cam, said bolt having a notch in which said pawl is received to lock said bolt when the cam is disengaged from said bell crank in response to fracture of the spindle, a housing for said inner lock secured to said base plate, a locking member normally held in non-locking position by said housing and adapted to be released to engage said lock lug and lock said bolt when the housing is knocked off said plate, said outer lock including means adapted to be actuated by a key inserted therein for establishing in the outer look a driving connection between said key and spindle when said spindle is turned by the key to open or close said inner lock.

FREDERICK J. BREMER. GEORGE J. BAUER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 405,057 Taylor June 11, 1889 1,308,521 Butter July 1, 1919 1,393,642 Lewis Nov. 29, 1921 1,620,775 Meilink Mar. 15, 1927 1,691,030 Benham et al Nov. 13, 1928