US2292515A

US2292515A - Tumbler lock

Info

Publication number: US2292515A
Application number: US399123A
Authority: US
Inventors: Harry F George
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-06-21
Filing date: 1941-06-21
Publication date: 1942-08-11
Anticipated expiration: 1959-08-11

Description

H. F. GEORGE TUMBLBR LOCK Aug. 11', 1942. 2,292,515

Filed June 21, 1941 3 Sheets-Sheet l I INVENTOR.

Jifys.

H. F. GEORGE TUMBLER LOCK Aug. 11; 1942.

s Sheets-Shet 2 Filed June 2l', 1941 INVENTOR. 139 60/" e v lvys.

H. F. GEORGE TUMBLER LOCK Aug. 11, 1942.

3 Sheets-Sheet '3 Filed June 21 1941 smoothness of operation,

- inserted into the locking cylinder. Fig. in an end elevation Patented Aug. 11, 1942 UNITED STATES PATENT" OFFICE- Applicazi u zu neii ifl sg z 399,123

18Chims.

This invention relates to locks and more particularly to looks of the tumbler type.

Among the objects of this invention are to provide a tumbler lock that is pick-proof. economical to manufacture, one that has a key that 1 is more diflicult to duplicate and one in which it is impossible to break a key off in the lock by a turningforce. Even if the key handle be broken off from the key body, the body may still be. easily removed from the keyhole. Another object is to provide a tumbler lock in which the locking cylinder may be removed from the locking mechanism body, and a new locking cylinder, having a different arrangement of tumblers, inserted in order to change the key combination when desired.

A further object is to provide a lock of the character described that eliminates any slot, depression or projection that would enable turning the cylinder for picking purposes.

A still further objectis to provide a lock which cannot be frozen against unlocking operation.

Another object is to provide a tumbler lock of improved construction, of greater certainty and oi'greater adaptability and pleasing appearance, ity and dependable operation.

Other objects, advantages and capabilities will later more fully appear.

My invention further resides in the combie nation, construction and arrangement of parts illustrated in the accompanying drawings, and while I have shown therein preferred embodi-= ments I wish it understood that the same is susceptible of modification and change without departing from the spirit of the invention.

In the drawings:

Fig. 1 is a perspective view of a movable part having my improved lock mounted therein for locking or unlocking the part as desired.

, .Fig. 2 is an enlarged side elevation of the looking cylinder.

Fig. 3 is an enlarged longitudinal section taken on a median plane through the locking cylinder showing a fragmentary portion of the locking mechanism body and a key partly in elevation and partly in section in a position just before being of the locking cylinder looking toward the right-hand end of Fig. 3.

Fig. 5 is an end elevation of the locking cylinder looking toward the left-hand end of Fig.-

3 but omitting the key. Fig. 6 is a transverse ing cylinder on the line 5-6 of Fig. 3.

Fig. 7 is a transverse section through the locking cylinder on the line l'l of Fig. 3. i

Fig. 8 is a transverse section through the looking cylinder on the line 8-8 of Fig. 3,. and showing a fragmentary portion of the locking mechanism body surrounding the locking cylinder.

Fig. 9 is a transverse section through the looking cylinder on the line 99 of Fig. 3.

Fig. 10 is a perspective view of the in the locking cylinder of Figs. 1-9.

Fig. 11 is an enlarged disassembled perspective view of the locking cylinder showing certain of the parts in separated position for the key used v sake of clarity.

and of greater durabilsection through the lock- Fig. shell locking-spring for holding the barrel against separation from the shell, separation when desired.

Fig. 13 is a view similar to Fig. 3 but showing the key fully inserted into the locking cylinder with the parts in position to throw the locking bolt one way or the other.

Fig. 14 is an enlarged longitudinal sectional view showing the key inserted and a wire or the like pushing inwardly on the dummy pin to move it into position to clear the striking projection and permit removal of. the locking cylinder when it is desired to change the lock.

. Fig. 15 is an enlarged longitudinal section through a modified form of my improved lock and showing a different construction for permitting removal of the locking cylinder.

Fig. 16 is a transverse section on the line l8l6 of Fig. 15.

Fig. 17 is a view similar to Fig. 15 but showing a further modification. i

Fig. 18 is a transverse section on the line l8-l8 of Fig. 17.

Fig. 19 is an enlarged fragmentary perspective view of the shell in the form of lock shown in Fig. 17.

Fig. 20 is an enlarged perspective view of a spring holding means of a type for use in the shell of Figs. 17 and 19. 1

Fig. 21 is an enlarged perspective'view of the intermediate rotatable portion and part of the plug used in connection with the-parts shown in Figs. 17-20. v

Fig. 22 is an enlarged perspective view of a key blank of the fiat key type, provided with means that may be cut to enable it to operate in my improved tumbler lock. I

Fig. 23 is a fragmentary view, in still greater enlargement, of the front end of a modified form 12 is an enlarged perspective view of the but permitting such.

2 of a finished flat key for use in a tumbler lock embodying my invention.

Fig. 24 is an enlarged end elevation of a tumbler locking cylinder formed to be operated with a flat key of the type shown in Figs. 22 and 23, and showing the front end portion of the key inserted into the key-receiving slot.

Fig. 25 is an enlarged diagrammatic view showing the operating relationship between the forward end portion of a fiat key of the type shown in Figs. 22 to 24, and the front end of the tumblers.

'Fig. 26 is a side elevation illustrating one of various types of shouldered plungers which may Fig. 2'? is a fragmentary longitudinal section ofsome of the (thefragment of the tumbler being in action between the disks and tumbler when a thief attempts to pick the lock.

Referring in detail to the a conventional form of a movable part I within which is mounted a tumbler lock embodying my invention, by means'of which this or any other desired movable part may be locked against movement and unlocked when desired. Referring to Figs. 3 and 11, my improved tumbler lock comprises a central shaft 2, the key end of which is formed into an enlarged end 1 and the opposite end of which is prov'ded for a short part of its length with a non-circular portion 4, so that upon rotation of shaft 2 cam plate 3 will ,be rotated in one or the other direction. Fixed to cam plate. -3 is a cam pin 5 by means of which a locking bolt (not shown) may be reciprocated in the Closely adjacent the enlarged or ribs 8, over which ribs are forced by a force fit three disks 0, b and c which form a head and which disks are circular in contour andare preferably stamped economically and in large numbers in suitable stamping machinery. This fixes head a, b, c rigidly in position on shaft 2 immediately back of the enlarged end 11. If desired; the head a, b, 0, may be formed into a single piece instead of in the form of three disks, by welding, brazing or otherwise, or as a single piece, as desired. The shaft 2, enlarged end 3 and the fixed head or disks a, b and c constitute what I will refer to as the locking plug. The disks a, b and 0 will be referred to as the plug head.

Loosely mounted on shaft 2 and immediately to the rear of disk 0 is the barrel comprising disks d, e, f, 9, h, i, i and k, which are generally similar to disks a, b and 0 except for the diiferences hereinafter pointed out. Disks d to k, as stated, are mounted upon shaft 2 with a certain amount of looseness so that for purposes more fully described earlier herein they may be moved edgewise rotationally a slight amount with relation to each other. Disks d to k each have a small hole therein holes are brought into alignment, extends a rod 1 which is loosely riveted at its two ends to loosely hold these disks together upon shaft 2 to permit said slight edgewise rotational movement. There are also provided in the various disks as seen in Figs. 3 and 6 to 8, a plurality of registering holes through which extend the

tumblers

8 and 9. In the form shown in Fig. 3, there are two of these tumblers registering holes, the two parts of each of these tumblers being of suitable different lengths for s. Each of the tumdirection by a coiled drawings, Fig. 1 shows in each of the combined.

bottom of each of the tumbler holes. The pin I is held by riveting or otherwise at one end to the disk 11 and at the other end to the disk is, so that the disks (1 to k are positioned together as a unit but more or less loosely as stated above. The disks 1:, b and c fixedly rotate spring II in the together with the shaft 2 or, as stated, they may be formed of a single cylindrical block if desired.

Concentric with shaft 2 and extending inwardly elevation) showing the grippin is provided withoutstanding fins I through which, when these over disks 1: to f, inclusive, is a cup-like shell ll within which disks 0, b and c are rotatable, but with relation to which disks d to k are stationary .except for the slight movement referred to above.

In order to-mount disks d to it onto shell I I, disk e is provided at diametrically opposite points with outstanding lugs l2 and I3 as seen in Figs. 3 and 11. Shell II at its inner end is provided at diametrically opposite points with bayonet slots l4 and I5. Lugs l2 and I3 are inserted into bayonet slots ll and I5 and given a turn sufflcient to carry them into the lateral extension of the bayonet slot. when thus positioned a spring-like ring member l6 having projections l1 and it see (Fig. 12) is inserted over disks 1 and a, with the projections I1 and I8 extending into the entrance portion of the bayonet slot in order to prevent backward movement fromthe laterally extending end of the bayonet slot of the lugs l2 and I3. The thickness of this spring member 16 in Fig. 12 is exaggerated for purposes of clarity, but it will be understood that the same is sufiiciently thin to have enough resiliency to permit it to be removed should it be desired to disassemble these arts.

From the above it will be seen that except for the lugs l2 and I3 of disk e the disks ato f are of smaller diameter than disks h to it because of these first mentioned disks being within the shell H. Disk 9 is also of smaller diameter than disks h to k because of receivingthereover the spring ring IS. The diameter of disks h, to k is preferably substantially the same as the outer diameter of the shell I I as seen in Fig. 3. As will be understood, in this type of lock the tumbler pins 8 and 8 (there being two of these pins in each of the tumbler holes) are longitudinally movable in the aligned holes in the various disks, and, as stated,

The key with suitable bittings 2| to accommodate the desired throw of the tumblers for the particular look under consideration. As seen in Figs. 5 to 9, there are six of these tumblers in the lock now being described, except that the tumbler 9 is a dummy tumbler, by which is meant that it is not moved longitudinally when the key is inserted in'place but its outer end is always in contact with the stop throw washer it except when being specially manipulated for enabling removal ofthe locking cylinder out of the looking mechanism body as later described.

From the above it will'be seen that when the key 2|] is inserted into the annular opening 22 and through a simflar opening in the stop throw washer It, the rear ends of the hitting grooves will so strike the adjacent end of the tumbler pins 9 as to move each of the tumblers such distance as to bring the adjacent ends of tumbler pins 8 and l in registry with the parting these two projections 25 or 26', which brings line 3?. The shaft 2, end y and rigidly mounted disks a, b and c (forming the plug head) will then upon rotation of the key be rotated inside of the shell ii, thus rotating the cam plate 3 fixed to the inner end of shaft 2, thus moving the cam pin 5 to'throw the locking bolt into locked or unlocked position, depending upon the direction of movement. As stated above, the dummy pin, 9 is not moved longitudinally when the key is inserted in the lock, but the meeting ends of the two pins which together form the dummy pin always stand at the parting line so that when the other'tumblers have been brought to the parting line by the key they together with the dummy'pin will stand at the parting line and permit rotation as described above.

As explained above, the disks d to k are mounted suiiiciently loosely with relation to shaft 2,

pin 1 and shell 'II as to enable a certain amount of twisting movement of these disks with relation to each other so that when a would-be thief attempts to pick the lock these disks will rotate a slight distance with relation to each other and become cramped against the tumbler pins and hold such pins against manipulation necessary on the part of the thief to be able to bring all of the tumblers to the meeting line to operate within which it is mounted,

the notch in cam plate 3 nearest into registry with the lug 24, notch 25 will still be the above mentioned distance out of registry with said lug so that regardless of which end of its throw cam plate 3 may be, it will always keep notch 25 away from registry with lug 24 because of the free outer end of the dummy pin 9 striking one or the other of these projections 26 and 26'. In order to bring notch 25 of cam plate 3 into registry with lug 24 to permit removal of the. locking cylinder from the cylindrical opening in part I all that is necessary is to insert the key in its opening to the full distance and rotate shaft 2 and cam plate 3 into position to bring notch 25 as near as possible into registry with lug 24 and then insert a -wire 21 or other suitable instrument through the opening in alignment with dummy pin 9 and push inwardly on this dummy pin until the dummy pin moves inwardly a sufflcient distance to clear the inner end of projecthe look. This is true of the form of tumblers shown in Fig; 3, and even more so with the shouldered type of tumbler pins 8 shown in Fig. 26. As will be understood, with such shouldered tumbler pins any rotational movement of the shaft 2 by the would-be thief would cause such rotational twisting of disks d to k with relation to each other as to bring the edge of one or the other of these disks beneath the shoulder of the shouldered locking pin, and thus prevent longitudinal movement of the locking pin and positively prevent the thief from being able to pick the lock. l

As will be noted in Figs. 3, 8, 11, 13 and l4, the two innermostdisks 7' and k are each provided with a peripheral notch which will be jointly referred to as 23. Extending into this notch isa ing or projection 24 integrally or otherwise formed at an adjacent position within the cylindrical opening in the locking mechanism body I within which the locking cylinder is mounted. The cam plate 3 is likewise formed with aperipheral notch 25 of a size substantially the same as notch 23, but normally positioned rotationally a. slight distance laterally from notch 23 and lug 24 as seen in Fig. 4. This slight edgewise displacement of notch 25 with relation to lug 24 prevents the locking cylinder from being withdrawn from. the cylindrical opening in the locking mechanism body I in the absence of special manipulation, which will now be explained.

As will be understood, when the key is inserted in the opening and the plug comprising the shaft 2, head 3 and disks a, b and c rotated, the cam plate 3 willalsobe rotated through any desired rotational distance (preferably 180). Referring to Figs. 6 and 14, the stop throw washer I! is formed with a punched out part or other projection 26 extending inwardly, there being one of these projections on one side of the axis of rotation and one of these projections on the.

opposite side of the axis of rotation in such position that the dummy pin 9 willstrike one of tion 28.

The opening in disk d to whichthe d-ummy pin extends when thus pushed,'is provided on one side with an elongated notch 28 (see Fig. 9) onthat side, and of a sumcient length, to permit suificient further rotation of the parts by mtlon of the key to bring notch 25 in cam plate 3 into registry with lug 24, which will then permit cam plate'3 to pass lug 24 and permit the locking cylinder to be removed from the cylindrical opening in the locking mechanism body i in order to insert a difierent locking cylinder if desired. A new locking cylinder may be inserted in the opening in after which the firmly locked in manner just described. As seen in Fig. 14, when the wire 21 is pushed inwardly against the dummy pin to release the cylinder lock, the key being in position in the lock, all of the tumbler pins will have their meeting ends at the parting line but the dummy pin will be pushed slightly beyond the parting line and lateral movement thereof with relation to disk it will be permitted by the slot 28 in disk d.

A modified form of means for holding the locking cylinder in position in the locking mechanisr'n body I but permitting removal thereof is shown in Figs. 15 and 16, in which a movable pin mounted in an appropriate radial 29 is movably opening formed in two or three of the disks referred to earlier herein other than disksa, b and c, the. outer end 30 'of this pin being of spherical shape and normally seatingin a cir-- cumferential groove 3| which extends entirely around the circumference of the cylindrical hole within which the locldng cylinder is mounted. At a. suitable appropriate position in the shaft 2 and in circumferential alignment with the groove II is a semi-spherical depression 32 into which the. inner end (which is also of spherical shape) of the pin 29 may'drop when it comes into registry therewith. when the plug is rotated into position to cause the depression 22 to register with the inner end of pin 29, the locking cylinder may be pulled outwardly from" the locking mechanism body by a straight longitudinal pull due to the fact that at this time the spherical shaped face 30 of the pin 3| will act as a cam with relation to the circumferential groove 2| and force pin 20 inwardly into recess 32 a distance to clear the outer end of the pin from circumferential groove II, and allow the locking cylinder to be pulled the outer end of form of lock having 36 passes through the opening longitudinally out of the locking mechanism body. This permits of inspection, repairs or substitution of a new locking cylinder.

Positioned in an appropriate groove in shell II (which shell in this form is somewhat longer than the shell forms previously described) is a friction ring 33 which presses outwardly a desired amount against the inner face of the cylindrical opening in locking mechanism body I to normally hold the locking cylinder in place but yet permit it to be removed upon the application of a suflicient pull upon the key, or upon any other desired pulling means. This ring 33 bears against the inner surfaceof said .hole with sufllcient friction to prevent the locking cylinder from being rotated or removed too easily, but yet permitting removal by pulling upon the key or otherwise as referred to above. In this form there is only one parting line or plane, which is indicated at p and is the same as in connection with Fig. 3. This means that the locking cylinder may be removed in the manner stated above by the use of the normal key, and when requiring two parting lines or planes have a separate or master key.

In the form shown in Figs. 1'7 to 21, the locking cylinder is removable from the cylindrical opening in the locking mechanism body i through the use of a second or masterkey (which has different bittings from those of the normal key), this two parting lines or planes, to-wit, one at p as in Fig. 3, and a second one at p. This means that each of the tumblers will be made of three parts 8a, 9a and 9b, of such lengths as to permit rotation along the parting line 9 when the normal key is used (which at this time will not permit rotation about theparting line p), and rotation about parting line p when the master key with its different bittings is used. The purpose of the additional parting line p is to enable rotation of the intermediate portion made up of the disks 1, m, n (the plug head also rotating therewith) so as to bring the recess 4| (Fig. 21) opposite a projection 36 (see Fig. 20) so that the upstanding spring-like projection 31 may under its inwardly urged spring action move inwardly away from the circumferential groove 38 formed in the inner face of the cylindrical opening in the locking mechanism body I. This, as will be understood, upon use of the master key permits the removal of the locking cylinder for inspection, repairs or renewal. The inside and

outside projections

36 and 31 are carried by a spring-like ring 39 which seats in the circumferential groove of the shell II", it being understood that the projection 35 in groove 40 of its shell.

It should be pointed out that when the master key is used to permt rotation at the parting line p, the tumblers will be in such position as to prevent rotation at the parting line 9 and hence at this time will cause the three intermediate disks 1, m, n to rotate with the outer disks a, b and c, the intermediate disks 1, m and n being provided with a depression 4| at the desired circumferential location in circumferential alignment with groove 0. When under action of the master key and rotation at the parting line p, the recess 4| is brought directly opposite the inner projection 36, the latter will under spring action move into recess ll, thus freeing the outer projection"?! from the circumferential groove 3'8 to permit the locking cylinder that describ'ed to be removed longitudinall from the cylindrical hole in locking mechanism body I. When the intermediate disks 1, m and n are rotated upon reinsertion of the locking cylinder in the hole, so as to move recess ll away from the innet projection 36, one or the other of the edges of recess 4| (depending upon the direction of rotation) will then move the outer projection 31 outwardly into groove 38 tolock the locking cylinder against removal from the locking mechanism body.

As seen in Figs. 15 and 17, two right-hand disks immediately inside of the cam plate {are formed with a recess 42 to receive the lug 43 projecting inwardly from the inner face of the locking mechanism body opening to locate the locking cylinder in proper position with relation to the other parts, to prevent rotational movement of the barrel of the locking cylinder and yet permit removal of the locking cylinder when pin 29 moves inwardly into depression 32 in Fig. 15, and when the outer projection 31 moves inwardly out of groove 38 in Fig. 1'7.

In Figs. 22 to 25, may be modified to be used in the tumbler lock of my present invention. In this formthe five tumblers and one dummy pin (making a total of six) are positioned closer together than in the previous forms, and the end of the otherwise fiat key is formed at its upperand lower longitudinal edges with arcuate flanges 44, I5, 46 and 41 extending laterally a sufficient distance to engage each of the groups of. three plungers, these flanges and intermediate portions being formed with the desired depth and size of bittings. Also in one or the other of the edges of the free end of the flat key may one or more projections responding notch or notches in the outer end of the shell as will be understood. The free end of my modified form of flat key is shown in blank in Fig. 22, and after the bittings have been cut therein in Fig. 23. By this arrangement a substantially flat key may be used to operate my improved form of tumbler'lock.

As will be understood from the above, the locking cylinder is made up of the plug, barrel and shell that together constitute the unit to throw the bolt into engagement with a locking mechanism body, or other similar part, to lock or unlock the parts as desired. The plug in Fig. 3 consists of the shaft 2, enlarged end 1! and three rigid disks a, b and c, the cam plate 3 being fixed at the inner end to the end of the shaft 2. The barrel is made up of the disks d to k loosely held together by pin 1 as shown at the right-hand side in Fig-11. The tumblers are arranged parallel to each other and operate lonopenings in the barrel and the disks a, b and c. As stated, the disks a, b and c are rigidly fixed to the shaft 2, but the disks d to k are sufficiently loose with relation to each other and with relation to the shaft 2 as to be capable of a slight edgewise rotational movement to cause a cramping or gripping action on the tumblers to prevent longitudinal movement thereof should a thief attempt to pick the lock. The locking plug is rotatable in the barrel. The shell is fixed to the barrel and in turn is dared to the locking mechanism body.

As will be understood, I slot, depression or projection in the outer end of the plug that might otherwise be available to a thief in attempting to pick the lock. Such thief would accordingly be unable to exert the I have shown howa flat key be formed. 48 to pass through a cor- I have eliminated any turning action to the plug that would be necessary in an attempt to pick the look. If the thief should attempt to use a pieceoi tubing to turn the plug he would close the key opening and thus be unable to work on the tumblers. as the locking plug is all in one piece it can be made small and enable the use of a small key. The plug shaft will preferably be made oi rustless iron or stainless steel to prevent rusting and enable smooth operation of the lock in all kinds of weather. The other inner parts that are away from the weather will preferably be made 01' brass or other non-corrodible metal. The

barrel, a locking mechanism body having an opening adapted to have the lock inserted longitudinally thereinto, said barrel having a peripheral notch in one end portion thereof, a lug on said body extending into said notch, a cam plate disks may be stamped out thus enabling economical production, and eliminating the danger or a thief picking th the old i'orm or solid barrel.

Having now described my invention, I claim: 1. A tumbler lock having a rotatable plug, a

e lock as he could do with barrel and a shell, the barrel comprising a plurality of disks arranged in parallel relation, said disks having alined openings to receive longitudinally movable tumblers, the disks being ,mov-

able edgewise to cramp and grip the tumblers and prevent longitudinal movement thereof when ,a thief attempts to pick thelock.

2. A tumbler lock barrel comprising, a plurality of disks having registering holes to receive tum blers, said disks being independently Y movable edgewise to cramp and grip the tumblers when a thief attempts to pick the lock.

3. In a tumbler lock, a rotatable plug, a relatively stationary barrel made. up of a plurality of parallel disks receiving longitudinally movable tumblers, said disks being connected together by a longitudinal pin.

4. In a tumbler look, a shell, a plug having a stem and being rotatable with relation to the shell when unlocked, a barrel secured to said shell and. generally stationary relatively thereto, tumblers in said plug and barrel, said barrel comprising a plurality of parallel disks having a plurality of sets of openings to receive the stem and tumblers, said disks being longitudinal pin.

5. In a tumbler lock, a shell, a plug having a stem and a head and being rotatable with relation to the shell when unlocked and non-rotatable with relation thereto -when locked, a barrel comprising a plurality of relatively thindisks connected together by a having alined amfal openings to receive said stem,

the stem being rotatable in the disks when the lock is unlocked and substantially non-rotatable with relation thereto when the lock is locked, cooperating tumblers longitudinally'. movable in the barrel disks and head, the disks being connected together by a pin, the barrel being connected to the, shell to be substantially non-rotatable with relation thereto;

6. In a tumbler lock, a shell, a plug and a bar- J cylinder from the rel, said barrel comprising a number of parallel disks, cooperating tumblers in the plug and barrel, one of said disks having means ior securing it to the shell, and a pin connecting said disks together against separation longitudinally of the lock.

7. In a tumbler lock, a shell formed with a slot in its side wall, a plug, a barrel having a lug adapted to be seated in said slot, and means for removably holding the lug in the slot.

8. In a tumbler lock, a shell formed with a slot in its side wall, a plug, a .barrel having a number of parallel disks, one of said disks hav-' ing a lug adapted to be seated in said slot, and means for removably holding the lug in the slot,

many seated, at first means'ior u venting removal or the barrel from brought into registry so that the locking cylinder may be removed from said body by a longitudinal pull. 1 4

10. In a tumbler lock construction, cylinder comprising a shell, a rotatable plug and a barrel, said plug having ahead, said head and barrel carrying longitudinally movable tumblers thereimone of the tumblers being normally inactive and having its outer end always flush with the inner face of the shell during normal operation of the lock, a projection in the shell against which the outer end of the inactive tumbler a locking strikes at the limit of one normal rotational movement of the plug, a lockingmechanism body within which the locking cylinder is mounted, a

lug on said body, said barrel having a notch receiving said lug, a cam plate fixed to said plug adjacent said lug and having a'notch normally out of registry with the lug and first mentioned notch, the barrel having an opening in alinement with the inactive tumbler, said last mentioned opening adjacent the outer end of the barrel hav-.

ing a lateral recess, and means for pushing the inactive tumbler longitudinally to clear the shell projection and permit iurther rotation of the plug to bring the cam plate slot and the locking mechanism bod-y lug into registry to enable 'removal of the locking cylinder from the locking mechanism body. I

11. In a tumbler lock construction, a locking cylinder comprising a rotatable plug, a shell and a barrel, said plug and barrel having tumblers therein, one oi said tumblers being always in a position to have its end in the parting plane between the adjacent races or the plug and barrel during normal operation of the look, a locking mechanism body having an opening within which said locking cylinder is mounted, a projection in said body, a recess in said barrel within which said projection is normally seated, means for normally holding said recess over said projection and means for releasing the barrel recess from said projection to permit removal of the locking locking mechanism body.

12. In locking mechanism, a locking cylinder comprising a rotatable plug, a shell and a barrel, a locking mechanism body having a lug, said barrel havinga recess within which said lug is normally seated, a first means for normally preventing removal 01 the barrel from said lug, and a second means i'or freeing the barrel from said lug to enable removal or thelocking cylinder irom the locking mechanism body when desired.

13. In looking m a locking cylinder 7 comprising a rotatable plug, a shell and a barrel, a locking body having a lug, said barrel having a recess within which said lug is nornormally presaid lug, and

on, a locking cylfrom the locking 6 a second means for freeing the barrel from said lug to enable remov l of the locking cylinder mechanism body when desired, said first means cam plate on the plug and having a peripheral notch of a size to rmit movement over the lug but normally out of registry therewith 14. In locking mechanism, a locking cylinder comprising a rotatable plug, a shell and a barrel, a locking mechanism body having a lug, said barrel having a recess within which said lug is normally seated, a first means for normally preventing removal of the barrel from said lug, and a second means for freeing ing to enable removal of the from the locking said first means comprising a cam plate on the plug and having a peripheral permit movement over the lug but normally out of registry therewith, saidsecond means comprising a stop in the shell to limit rotational movement of the plug and cam plate, and a tumbler normally strikeable against said stop but movable away therefromwhen desired to remove the locking cylinder from the body.

15. In locking mechanism, a tumbler locking cylinder comprising a shell, a rotatable plug and a barrel, the plug having a head, an intermediate rotatable portion, the plug head, the intermediate portion and the barrel each having a set of separate tumblers so as to provide two parting planes, one parting planebeing between the adjacent faces of the plug head and the intermediate portion, and the other parting plane being between the adjacent faces of the intermediate portion and the barrel, a locking mechanism body, the intermediate portion having holdingv means coacting with the locking mechanism notch of a size to on its front key to release the said holding means from the locking mechanism body to permit withdrawal of the locking cylinder.

16. In locking mechanism, a tumbler locking cylinder comprising a shell, a rotatable plug and a barrel, a locking mechanism body having an opening within which the locking cylinder is normally mounted, the locking cylinder and the locking mechanism body having coacting means preventing withdrawal of the locking cylinder during normal operation of the lockin mechanism, and manual means operable from the front face of the locking cylinder for releasing said coacting means to enable withdrawal of the locking cylinder from the locking mechanism body.

1'7. In locking mechanism, a tumbler locking cylinder comprising a shell, a rotatable plug and a barrel, a locking mechanism body having an opening within which the locking cylinder is normally secured, the walls of said opening having a recess, a pin transversely movable in said barrel and having its outer end normally seated in said recess, a recess in the side of the rotatable plug, said plug being rotatable by a key to bring the recess in the plug into registry .with the pin to permit the pin to move into the recess in the plug to enable withdrawal of the locking cylinder from the locking mechanism body.

18. In combination in a tumbler lock, a shell having an opening in its front face, a plug and a barrel, tumblers longitudinally movable in the plug and barrel, the plug being rotatable in the shell and barrel, a key of the fiat type having end laterally extending arcuate flanges, bittings in the forward end of said key and flanges, the forward end of the plug being positioned within. the opening in the shell and body to normally hold the loeking cylinderin the- I locking mechanism body, said one parting plane being brought into operation upon use of a regular key, and said otherparting plane being brought into operation upon the use of a master radially spaced from the edges thereof to form an annular opening, the arcuate flanges of the key. being. insertable into said annular opening to operate the tumblers.

HARRY F. GEORGE.