US2613528A - Cylinder lock - Google Patents

Description

Oct. 14, 1952 J. E. SALMIVUORI 2,613,528

CYLINDER LOCK Filed Feb. 24, 3.948

2 SHEETS-SHEE'I 1 Oct. 14, 1952 Filed Feb. 24, 1948 2 Ti r 33 4 T J. E. SALMIVUORI 2,613,528 CYLINDER LOCK 2 SHEETS-SHEET 2 FIE. ll

Patented Oct. 14, 1952 CYLINDER LocK i Johannes Erkki Salmivuori, Helsingfors, Finland, assignor to Aktiebolaget Addo, Malmo, Sweden,

a corporation of Sweden Application February 24, 1948, Serial No; 10,331

I In Finland February 7, 1947 Section 1, Public Law 690, August 8, 1946 Patent expires February 7, 1967 12 Claims.

This invention relatesto an improvement in cylinder locks of a known type, whereby the safety of the lock is considerably increased and a methodical picking of the lock is thus rendered substantially impossible.

The known type of cylinder locks comprises tumblers in the form of circular disks rotatably inserted in a lock barrel which in turn is rotatably inserted in a cylindrical bore in the casing. The barrel has a longitudinal slot in which a radially movable tumbler bar is disposed, which bar is received, in looking position, in a longitudinal locking groove inlthe casing and thus prevents rotation of thelbarrel in said casing. Each disk has a recess in its periphery and by means of a key that is introducedinto a central key hole passing through all disks, they can be rotated into a position in'which their recesses are aligned and form a' continuous openinggroove for partly receiving the tumbler bar which is thereby released from'the casing and instead locks together the barrel with all disks so that the barrel and the disks may be rotated for opening of the lock. The radial parallel displacement of the tumbler bar is caused by a tangential force by means of a wedging action between the wedge surfaces of the bar and the locking groove and the disk recesses;

Locks of this type" may be picked by causing a tangential force to act upon the barrel, so that the tumbler bar is pressed by said wedging action against the periphery of the disks, whereafterwthe disks are rotated one at a time by means of a suitable tool 'until'it can be felt that the friction against the'bar ceases and the recess of the disk thus registers with the bar.

The principal object of the invention is to provide alock of the kind referred to, which comprises a plurality of tumbler bars and corresponding locking grooves and opening recesses and in which only one tumbler bar at a time can be brought into bearing contact with the tumbler disks when the "lock is locked, whereby picking of the lock in the indicated manner is prevented.

Another object of the invention is to construct a lock of the kind referred to, comprising more than one tumbler bar, in such a way that when a tumbler bar has been brought into opening position by picking, the tumbler disks are fixed in relation to each other and to the barrel so as not to be individually adjustable in relation to another tumbler bar.

A further object of the invention is to provide a lock having tumbler disks with blind recesses 2 of the same size and form as the opening recesses so that a tumbler bar can be brought by picking into opening position by being introduced into both opening and blind recesses without indicating which of the recesses are blind ones.

Still another object of the invention is to provide the different tumbler bars with positionmg extensions fitting into corresponding recesses in connection with the locking grooves, so that each tumbler bar can be moved into a determined groove only.

A still further object of the invention is to provide means for holding the tumbler bars parallel to the axis of the barrel and for preventing longitudinal movement of the tumbler bars.

Further objects and advantages of the invention will appear from the following description of two embodiments of the invention, reference being had to the accompanying drawings in which:

Fig. 1 is an axial section through the first emgodirgient of the invention, taken on line II in Fig. 2'is an axial section on line IIII in Fig. 3.

Fig. 3 is an end view. as seen from the left according to Figs. 1 and 2.

Figs. 4 and 5 are crosssections on line IV-IV in Fig. 1, showing the lock in locked and opened position, respectively.

Fig-6 is a similar cross section of the lock in another locking position that may occur when it Iins tried to pick the lock.

ig. 7 shows a detail in cross VH VH in Fig. 1. section on line Fig. 8 is a cross section similar to Fig. 7, but showing the parts in another position.

Figs. 9 and 10 show a modification partly in axial section along lines corresponding to lines IIX and II-II in Fig. 3, respectively.

Fig. 11 shows a washer.

Fig. '12 shows a side view of the key of ,the'lock.

Fig. 13 shows the key ofthe lock-in cross section on'line XIII-XIII in Fig. 12.

Figs. 14 and 15 show partly in axial sections corresponding to Figs. 1 and 2. another embodi ment of the invention.

Fig. 16 shows a detail in cross s a XVI-XVI in Fig. 14. echo Fig-17 is a cross section similar to Fig- 16, but showing the parts in another position.

Referring to the drawings, in the first-embodiment shown in Figs. 1 .to. 13 the lock according to the invention comprises a casing llwith a cylindrical. here which is completely open at the rear butis closed at its front end by means of an tained in the casing by a disk I which is attached.

by means of a screw 8 to the rear end of .the

casing and which is slotted at its one side so as to form a click spring 9 adapted to .engage a notch ID in the end wall of the barrel in order to stop the barrel in a certain position on turning it in locking direction. The disk I hasa suitable hole I I for the coupling means 6.

Alternating with washers I3 there is inserted in the barrel 4 a number of tumbler disks [2- (in the present case ten) rotatably fitting in the barrel. each comprise a projection I4 engaging a wide longitudinal slot I5 inthe barrel 4, so that the diskscannot be rotated in relation to the barrel.

Furthermore, the washers have a'centrfalhole I 6 permitting the keypertaining to the lock freely to pass therethrough, and a 'recess. il 'attheir periphery for a purpose to be indicatedin. the

following. Thetumbler disks IZare all provided with a central key hole in the form of acircle sector having a centre angle-ofpreferably at least 180". The radial edges of the key holes of the'tumbler disks form abutments for the key when opening and closing the.lock,v respectively.

'I he key "(Figs 12 and-13,) is inthe. form-of a numberjof coaxial sectors I8 laid after each other an'd'each forming ,abutments for a tumbler disk,

and. as all sectors have diiferent .centre angles the key when introduced into the closed lock and L'turnedfin ,opening direction, in the present case in clockwise direction, successivelyzacts upon all tumbler disks causing them to occupy a determined-positionin relation to each other and to the other parts of the look. In this position two sets of opening recesses a primary one I9, and a secondary one 25, provided'in the tumbler disks .ar'e'each. brought into alignment with each other r (Fig. 5), so as to form two continuous longitudinalopeninggrooves. .The barrel .4 has two longitudinal slotis 2i and '22 and'the'inside of. the 'casing has two longitudinal locking grooves. 23

and 2,4.at the same mutual-angular spacing as Itherecesses I9l and ofzthe tumbler disks. In 'each of the slots 2| and 22 of the barrelthere is ,placed a longitudinal tumbler bar 25 and 26, re-

to be partlyreceived, in opening position (Fig. 5), within a corresponding opening groove formed by thev opening recesses -ofthe tumbler disks, whereby said bar .locks the tumbler disks in the barrel but leaves thelatter free in relation-to the casing so that the lock may beopened.

'Ihe movement of the tumbler bars 25, 26, which is made possible thanks to the recesses I I of the washers I3, is realizedby tangential pressure from the barrel 4 or the tumbler disks I2. Thelocking grooves 23 and 24, of thecasingas well as the recesses I9 and 20 of the Itumblerdisks-each have one of their sides inclined, in relation to the Ia'di'usand the tumbler bars have wedge surfaces at their corresponding'sides, soasto c'o-operate when opening and closing the lock with the inclined sides like wedges. When opening the lock Said washers I3 being shown in Fig.1

4. the tumbler bars are thus pressed by the barrel against the inclined sides of the locking grooves of the casing and are thereby moved out of said grooves and into the opening recesses of the tumbler disks; while upon locking the inclined sides of the opening recesses of the tumbler disks press the tumbler bars outwardly into locking position in the locking grooves of the casing.

For rotation of the barrel 4 in the casing I at least one of the tumbler disks I2 comprises a pin 21: projecting from the periphery of the disk into the wides'lotl 5 of the barrel to act upon an edge of the slot after a certain rotation of the disk.

Thepin isdisposed so as to strike the slot edge, upon opening, at the same moment as the opening recesses I9 and 20, respectively, of the tumbler disk are aligned with each other, so that upon diately .caused to. press the, tumbler bars outwardl'y so that the latter as soon as they register with theirrespective locking grooves in the casing, fall into said grooves and lock the barrel, whichtakes place simultaneously with the click spring 9 engaging the notch I0 and stopping the barrel. In order that. the key, may be taken out itmust be further. turned, its locking abutment, consisting of aplanesurface 28, collecting all tumbler disks oneat a tim and bringing their key; holes to register, which takes place at the same time as the pin 2'I-- strikes the edge of the slot I5 and thus prevents any continued turning. The tumblerbars 25 and 26 are formed so as to be able only to fall into their proper locking grooves 23and 24, respectively, in the casin I. For this purpose they may be provided at either end, or both ends with lateral extension 29 and 30, respectively, projecting, in opposite directions and fittingin corresponding recesses 3| in connection with the corresponding locking grooves, or the bars and also the-locking grooves may be of difierent lengths, as shown in Fig. 10. In the latter case the shorter bar 25 is anchored, preferably by means of a radial pin 32, in a bore 33 in the barrel so as not to be displaceable longitudinally. Combinations of both arrangements may also be suitable. r

In order to prevent the possibility of picking the lock in the manner indicated in the introduction, at least some of the tumbler disks I 2 are each provided with one or more blind or misleading recesses 3.4 which may be of the same size and form asthe opening recesses I9 and 20. Said blind recesses, of course, per se make the picking of the lookmore difiicult, but the invention, furthermore comprises a new arrangement making the picking. of the lock practically impossible and involving that, in locking position, the tumbler bars cannot be simultaneously pressed against the tumbler disks.

In the first embodiment of the invention this is realized simply by the fact that the locking grooves 23,. 24 of the casing and the tumbler bars 25,26 are so dimensioned in relation to each other that,.in ordinary locking position (Fig. 4), only one bar 25 which is here called the primary bar, positivel locks the barrel 4 in the casin I, while the secondarybar ZB-has a certain clearance in its groove 24. As a result thereof, the tumbler disks can each be adjusted, without the aidof the proper key, into opening position only in relation to the primary tumbler bar 25; since the secondary bar26 cannot be caused to-exert pressure on and thus friction against the tumbler disks. The primary bar 25 can, however, be

brought into opening position, but then the situa- 29 in each tumblerw'disk have the same mutual angular spacing as the slots 2 I, 22 of the barrel 4.

In this situation the secondary tumbler bar-.26

may be pressed against the tumbler disks; it is true, but now the latter are locked in relation to each other and the barrel and "thus. cannot be adjusted individually.

In the second embodimentshown in Figs.-l4-

to 17, the two tumbler bars 25b, 26b and'their locking grooves 23, 24 may be of such dimensions that the two bars simultaneously positively lock the barrel 4 in the casing 1 However, the primary tumbler bar 251) here has an'arm '35 which extends along the periphery of the barrel and always underlies the secondary tumblerb ar 26b and in normal locking position holds the latter free from the tumbler disks-but when the primary tumbler bar 25b falls into openin position, said arm permits the secondary tumbler bar 2611 also to fall into openingposition. On the other hand, in opening position the secondary tumbler bar 261) holds the primary tumbler bar 25?) pressed in, so that the latter cannot be moved out into locking position before the secondarybar. Thereby the primary bar 251') is prevented from falling into the wrong locking groove if the tumbler bars are placed in suchrelationship that onturni'ng the barrel in locking direction the primary tumbler bar 251) must pass the secondary-locking groove 2 1 before it'reaches its proper-docking groove 23, The arm 35 is provided at its-free end with a pivot 36 parallel to the 'tumbler bar and rotatably mounted in the barrel, said;"pivot forming a fulcrum for the tumbler bar 2519 in its movements and holding it correctly positioned. The secondary tumbler bar-26b is preferably in a similar manner pivotally mounted and guided in the barrel by means of a"t1'ansverse arm 3! and apivot 3B.

The invention is not'limitedto the embodi ments thereof described above and shown in the drawings, for said embodiments may be modified in different ways without departing from the scope of the appended claims. Thus, the tumbler disks may be'of any suitable number, and the lock may be provided, if desired, with three or more tumbler bars with pertaining recesses, slots and grooves, whereby "the safety of the lock is further increased. v

What I claim and desire to secure by Letters Patent is:

1. A cylinder lock operable by a'key, comprising a casing having a cylinder bore and a plurality of longitudinal locking grooves in its inner wall, a lock barrel in said bore having longitudinal slots correspondingto said locking grooves, a plurality of circular tumbler disks independently rotatable in said barrel and having opening recesses at their edges corresponding to said locking grooves and said slots andadapted to be aligned for forming continuous opening grooves on rotating said, disks by said key for opening the lock, saiddisks also havingblind recesses, a radially movable, longitudinaltuni- 1 bler bar having wedge shaped surfaces thereon in each of saidbarrel slots, each of said'tumbler bars in locking position being partly received in a corresponding one of 'said.;locking grooves to prevent rotation of said barrel in relation to said casing and in opening position being partly.- received in a correspondingv one of said opening grooves for releasing said barrel in relation to :said casing and locking said tumbler disks in relation' to eachother and to said barrel, said locking grooves and said longitudinal slots each having one side thereof inclined with respect to theradius of the lock and together with the wedgeshaped surfaces of said tumbler bars forming wedge means for forcing said tumbler bars radially inwards and outwards by said barrelv or said disks being actuated by the key, and supporting means coacting with'said tumbler bars for preventing one of said tumbler bars from being forced by said wedge means against said tumbler disks when another. ofsaid tumbler bars is in its locking position.

2. A cylinder lock-operable by a key, comprising a casing having a cylinder bore and a plurality of longitudinal locking grooves in its inner wal1,'a 'lock barrel in said bore having longitudinal slotscorresponding to said. locking grooves, a plurality of circular tumblerdisks independently rotatable in said barrel'and having opening recesses at their edges corresponding to' said locking grooves and said slots and adapted to be aligned for forming :continuous opening grooves on rotating said disks by saidkey for opening the -lock,- said .disks also having blind recesses, a radially movable, longitudinal tumbler bar having wedge shaped surfaces thereon in each of said barrel slots, each of said tumbler bars in looking positions being partly received ina correspondingone of said locking grooves to prevent rotation-of said barrel in relation to said casing and ;in opening position being partlyreceived in a corresponding one of said opening grooves for releasing said barrel in relation to said casingand locking said tumbler .disks in relation to each other and to'said barrel, positioning means including extensions on said tumbler bars, said lock-ingrgmoves having corresponding recesses therein, said positioning-means being adapted to be received in said corresponding recesses in said locking grooves, so that each of said tumbler bars can be partly received only inits corresponding locking grooves,-said locking grooves and said longitudinal slots each having one side thereofinclined with respect to the radius of the lock and together with the Wedge shaped surfaces of said tumbler bars forming wedge means for forcing said tumbler bars radially inwards and outwards by said barrel or said disks being actuatedby the key, and supporting means coacting with said tumbler bars forpreventing one of said tumbler bars from being forced by said wedge means against said tumbler disks when another of said tumbler bars is in .its locking'position.

3. A cylinder lock-operable by "a key, comprising a casing having a-cylinder bore and a primary longitudinallocking groove and a secondary longitudinal locking groove, in its inner wall, a lock barrel'in said bore having a primary longitudinal slot and a secondary longitudinal slot corresponding to said locking grooves, a plurality of circular tumblerv disks independently-rotatable in said barrel and each having a primary opening recess. and. a secondary open-'- 7 ing recess corresponding to said locking grooves and said slots and adapted to be aligned for forming two continuous opening grooves on rotating said disks by the proper key for opening the lock, the disks also having blind recesses, a primary tumbler bar in said primary barrel slot and a secondary tumbler bar in said secondary barrel slot, wedge means including'wedge surfaces in said locking grooves and said tumbler disk recesses and on said tumbler bars for forcing said bars radially outwards into locking position, in which said barrel is locked in said casing, or radially inwards into opening position, in which said barrelis released from said casing and said tumbler disks are locked in relation to each other and to said barrel, said secondary locking groove being dimensioned to provide a clearance space between said wedge surfaces of said secondary locking groove and said secondary tumbler bar, so that said secondary bar can be forced inwards into engagement with said tumbler disks only when said primary tumbler bar is in opening position releasing said barrel and locking said tumbler disks.

slot and a secondary longitudinal slot corresponding to said'locking grooves, a plurality of circular tumbler disks independently rotatable in said barrel and each having a primary opening recess and a secondary opening recess corresponding to said locking grooves and said slots and adapted to be aligned for forming two continuous opening grooves on rotating said disks by the proper key for opening the lock, the disks also having blind recesses, a primary tumbler bar in said primary barrel slot and a secondary tumbler bar in said secondary barrel slot, wedge means including wedge surfaces in said locking grooves and said tumbler disk recesses and on said tumbler bars for forcing said bars radially outwards into locking position, in which said barrel is locked in said casing, or radially inwards into opening position, in which said barrel is released from said casing and said tumbler disks are locked in relation to each other and to said barrel, said secondary locking groove being I dimensioned to provide a clearance space between said wedge surfaces of said secondary locking groove and said secondary tumbler bar, so that said secondary bar can be forced inwards into engagement with said tumbler disks only when said primary tumbler bar is in opening position releasing said barrel and locking said tumbler disks, and guiding means for keeping said tumbler bars parallel with the axis of said barrel and preventing longitudinal movement of one of said tumbler bars including a radial pin on said one tumbler bar and a radial bore in said barrel, said pin being anchored insaid radial bore in 'said barrel.

5. A cylinder lock operable by-a key, comprising a casing having a cylinder bore and a primary longitudinal locking groove and 'a secondary longitudinal locking groove in its inner wall, a lock barrel in said bore having a primary longitudinal slot and a secondary longitudinal slot corresponding to said locking grooves, a plurality of circular tumbler disks independently rotatable in said barrel and each having a primary opening recess and a secondary opening recess corresponding to said locking grooves and said slots and adapted to be aligned for forming two continuous opening grooves on rotating said disks by the proper key for opening the lock, the disks also having blind recesses, a primary tumbler bar insaid primary barrel slot and a secondary tumbler bar in said secondary barrel slot, wedge means including wedge surfaces in said locking grooves and said tumbler disk recesses and on said tumbler bars for forcing said bars radially outwards into locking position, in which said barrel is locked in said casing, or radially inwards into opening position, in which said barrel is released from said casing and said tumbler disks are locked in relation to each other and to said barrel, and a lateral arm on said primary tumbler bar underlying said secondary tumbler bar and keeping it out of engagement with said tumbler disks when said primary tumbler bar is in looking position and preventing said primary tumbler bar from moving into locking position whensaid secondary tumbler bar is in opening position.

6. A cylinder lock operable by a key, comprising a casing having a cylinder bore and a primary longitudinal locking groove and a secondary longitudinal locking groove in its inner wall, a lock barrel in said bore having a primary longitudinal slot and a secondary longitudinal slot corresponding to said locking grooves, a plurality of circular tumbler disks independently rotatable in said barrel and each having a primary opening recess and a secondary opening recess corresponding to said locking grooves and said slots and adapted to be aligned for forming two continuous ODening grooves on rotating said disks by the proper key for opening the lock, the disks also having blind recesses, a primary tumbler bar in said primary barrel slot and a secondary tumbler bar in said secondary barrel slot, wedge means including wedge surfaces in said locking grooves and said tumbler disk recesses and on said tumbler bars for forcing said bars radially outwards into locking position, in which said barrel is locked insaid casing, or radially inwards into opening position, in which said barrel is released from said casing and said tumbler disks are locked in relation to each other and to said barrel, a lateral arm on said primary tumbler bar underlying said secondary tumbler bar and keeping it out of engagement with said tumbler disks when said primary tumbler bar is in looking position and preventing said primary tumbler bar from moving into locking position whenesaid secondary tumbler bar is in opening position, a lateral arm on said secondary tumbler bar, and longitudinally extending pivots on said lateral arms rotatably mounted in longitudinal bores in said barrel to keep said tumbler bars parallel with the axis of said barrel and prevent longitudinal movement of said tumbler bars.

7. A cylinder lock operable by a key, comprismg a casing having a cylinder bore and a plurality of longitudinal locking grooves in its inner wall and a cam surface forming one side of each locking groove, a lock barrel in said bore having longitudinal slots corresponding to said locking grooves, a plurality of tumbler disks independently rotatable in said barrel and having opening recesses so positioned at the edges of the disks as to be aligned for forming a continuous opening groove behind each of said barrel slots on rotating said disks by said key in opening direction and having one edge fashioned to form a cam surface in each opening groove, a radially movable longitudinal tumbler bar in 9 each of said barrel slots, which'in locking position is partly received in a corresponding one of said locking grooves to prevent rotation of said barrel in relation to said casing and in opening position partly received in a corresponding one of said opening grooves for permitting rotation of said barrel in relation to said casing and preventing rotation of said tumbler disks in relation to each other and to said barrel, each tumbler bar having a cam surface for cooperation with said cam surfaces in said locking grooves and said opening grooves to force each tumbler bar into opening and locking position, respectively, on rotation of said disks in opening or closing direction, and supporting means for preventing one of said tumbler bars from being forced radially inward by said cam surfaces when another of said tumbler bars is in looking position. r

8. A cylinder lock operable by a key, comprising a casing having a cylinder bore and a plurality of longitudinal locking grooves in its inner Wall and a cam surface forming one side of each locking groove, a lock barrel in said bore having longitudinal slots corresponding to said locking grooves, a plurality of tumbler disks independently rotatable in said barrel and having opening recesses so positioned atthe edges of the disks as to be aligned for forming a continuous opening groove behind each of said barrel slots on rotating said disks by said key'in opening direction and having one edge fashioned to form a cam surface in each opening groove, a radially movable longitudinal tumbler bar in each of said barrel slots, which in looking position is partly received in acorresponding one of said locking grooves to preventrotation of said barrel in relation to said casing and in opening position partly received in a corresponding one of said opening grooves for permitting rotation of said barrel in relation to said casing and preventing rotation of said tumbler disks in relation to each other and to said barreLeach tumbler bar having a cam surface for cooperation with said cam surfaces in said locking grooves and said opening grooves to force said tumbler bar into opening and locking position, respectively, on rotation of said disks in opening or closing direction, positioning means including extensions on said tumbler bars adapted to be received in corresponding recesses in connection with said locking grooves and permitting each of said tumbler bars to be partly received only in its corresponding locking groove, and supporting means for preventing one of said tumbler bars from being forced radially inwards by said cam surfaces when another of said tumbler bars is in looking position.

9. A cylinder lock operable by a key, comprising a casing having a cylinder bore and a primary longitudinal locking groove and a secondary longitudinal locking groove in its inner wall, and a cam surface forming one side of each locking groove, a lock barrel in said bore having a primary longitudinal slot and a secondary longitudinal slot corresponding to said locking grooves, a plurality of tumbler disks independently rotatable in said barrel and having each a primary and a secondary opening recess so positioned at the edges of the disks as to be aligned for forming a continuous opening groove behind each of said barrel slots on rotation of said disks by said key in opening direction and having one edge fashioned to form a cam surface in each opening groove, said disks also having blind reamazes cesses, a primary and a secondary tumbler bar'v in said primaryand secondary barrel slot, re-' spectively, which in locking position are partly received in said primary and secondary locking groove, respectively, to prevent rotationof'said' barrel in relation to said casing andin' opening position partly received in said primary and secondary opening groove, respectively, for permitting rotation of said barrel in relation'tosaid casingand preventing rotationof said tumbler disksin' relation to each other and to said bar} opening or closing direction, said secondary tum-' bler bar being so dimensioned in relation to said.

secondary locking groove as to leave in looking position a clearance space between its camsurface and said cam surface in said locking groove, permitting said secondary tumbler bar, to be forced into engagement with said tumbler disks only when said primary tumbler bar is in opening position releasing said barrel and locking said tumbler disks.

10. A cylinder lock operable by a key, com-- prising a casing having a cylinder bore and a primary longitudinal locking groove and a secondary longitudinal locking groove in its inner wall, and a cam surface forming one side of each locking groove, a lock barrel in said bore having a primary longitudinal slot and a secondary longitudinal slot corresponding I to said locking grooves, a plurality of tumbler disks independently rotatable in said barrel and having each a primary and a secondary opening recess so positioned at the edges of the disks as to, be aligned for forming a continuous opening groove behind each of said barrel slots on rotation of said disks by said key in opening direction and having one edge fashioned to form a cam surface ineach opening groove, said disks also havingblindrecesses, a primary and asecond tumbler bar inv said primary and secondary barrel-slot, respectively, which in looking position are partly re-= ceived in said primary and, secondary lockinggroove, respectively, to prevent rotation of said barrel in relation to said casing and in opening position partly received in said primary and secondary opening groove, respectively, for permitting rotation of said barrel in relation to said casing and preventing rotation of said tumbler disks in relation to each other and to said barrel, each tumbler bar having a cam surface for cooperation with said cam surfaces in said locking grooves and said opening grooves to force said tumbler bars into opening and locking position respectively, on rotation of said disks in opening or closing direction, said secondary tumbler bar being so dimensioned in relation to said secondary locking groove as to leave in locking position a clearance space between its cam surface and said cam surface in said locking groove, permitting said secondary tumbler bar to be forced into engagement with said tumbler disks only when said primary tumbler bar is in opening position releasing said barrel and locking said tumbler disks, and guiding means including a radial pin on each of said tumbler bars slidingly mounted in corresponding radial bores in said barrel to keep said tumbler bars parallel with the axis of said barrel and prevent longitudinal movement of said tumbler bars.

11. A cylinder lock operable by a key, comprising a casing having a cylinder bore and a primary longitudinal locking groove and a secondary longitudinal locking groove in its inner wall, and a cam surface forming one said of each locking groo've, a lock barrel in said bore having a primary longitudinalslot and a secondary longitudinal slot corresponding to said locking grooves, a plurality of tumbler disks independently rotatable in said barrel and having each a primary and a secondary opening recess so positioned at the edges of the disks as to be aligned for forming a continuous opening groovebehind each of said barrel slots on rotation of said disks by said key in opening direction and having one edge fashioned to form a cam surface in each opening groove, said disks also having blind recesses, 21 primary and a secondary tumbler 'bar in said primary and secondary barrel slot, respectively, which in looking position are partly received in said primary and secondary locking groove, respectively, to prevent rotation of said barrel in relation to said casing and in opening position partly received in said primary and secondary opening groove, respectively, for permitting rotation of said barrel in relation to said casing and preventing rotation of said tumbler disks in relation to each other and to said barrel, each tumbler bar having a cam surface for cooperation with said cam surfaces in said locking grooves and said opening grooves to force said tumbler bars into opening and locking position, respectively, on rotation of said disks in opening or closing direction, and a lateral arm on said pri mary tumbler bar underlying said secondary tumbler bar and keeping it out of engagement with said tumbler disks when said primary tumbler bar is in locking position and preventing said primary tumbler bar from moving into locking position when said secondary tumbler bar is in opening position.

12. A cylinder lock operable by a key, comprising a casing having a cylinder bore and a primary longitudinal locking groove and a secondary longitudinal locking groove in its inner wall, and a cam surface forming one side of each locking groove, a lock barrel in said bore having a primary longitudinal slot and a secondary longitudinal slot corresponding to said locking grooves,

a plurality of tumbler disks independently rotatable in said barrel and havin each a primary and a secondary opening recess positioned at the edges of the disks as to be aligned for forming a continuous opening groove behind each of said barrel slots on rotation of said disks by said key in opening direction and having one edge fashioned to form a cam surface in each opening groove, said disks also having blind recesses, a primary and a secondary tumbler bar'in said primary and secondary barrel slot, respectively, which in looking position are partly received in said primary and secondary locking groove, respectively, to prevent rotation of said barrel in relation to said casing and in opening osition partly received in said primary and secondary opening groove, respectively, for permitting rotation of 'said barrel in relation to said casing and preventing rotation of said tumbler disks in relation to each other and to said barrel, each tumbler bar having a cam surface for cooperation with said 'cam surfaces in said locking grooves and said opening grooves to force said tumbler bars into op'ening and locking position respectively, on rotation of said disks in opening or closing direction, a lateral arm on said primary tumbler bar underlying said secondary tumbler bar and keeping it out of engagement with said tumbler disks when said primary tumbler bar is in looking position and preventing said primary tumbler bar from moving into locking position when said secondary tumbler bar is in opening pcsltion,'and a lateral arm on said secondary tumbler bar, and longitudinally extending pivots on, said lateral arms mounted in longitudinal bores in said barrel to keep said tumbler bars parallel With'the axis of said barrel and prevent longitudinal movement of said tumbler bars. I "JOHANNES ERKKI SALMIVUORI.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 293,885 Jackson Feb. 19, 1884 2,217,047 "Fitz'Gera'ld' Oct. 18, 1940

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