US1154142A

US1154142A - Lock.

Info

Publication number: US1154142A
Authority: US
Inventors: Ernest L Teich
Original assignee: American Hardware Corp
Current assignee: Emhart Industries Inc
Priority date: 1914-09-26
Filing date: 1914-09-26
Publication date: 1915-09-21
Anticipated expiration: 1932-09-21

Description

' E. L. TEICH.

LOCK.

APPLICATION FILED SEPT.26,1914.

1,154,12. PatentedSept. 21, 1915.

3 SHEETS-SHEET 1.

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LOCK.

APPLICATION FILED sEPT.26. 1914.

Patented Sept. 21, 1915.

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E. L. TEICH.

LOCK.

APPLICATION FILED SEPT.26.1914.

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Patented Sept. 21, 1915.

UNTTED STATE FATENT @FFTQE.

ERNEST L. TEICH, OF NEW BRITAIN, CONNECTICUT, ASSIG-NC-R TO THE AMERICAN HARDWARE CORPURATIGN, OF NEVJ BRITAIN, CONNECTIUUT, A CORPORATION OF CONNECTICUT.

LOCK.

Specification of Letters Patent.

Patented Sept. 21, 1915.

To all whom it may concern. 7

Be it known that I, Emsns'r L. TEICH, a citizen of the United States, residing at New Britain, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Locks, of which the following is full, clear, and exact description.

This invention relates to locks of the type embodying a latch bolt and a dead bolt, and aims to provide operating mechanism for these bolts controlled by three different classes of keys, the keys of one class operating the latch bolt only, and the keys of the second and third classes operating the latch bolt and also operating the dead bolt, one of these last named classes of keys being superior to the other, the mechanism controlled thereby being arranged to shut out the lock against operation by the other class of keys.

The invention in its specific embodiment is described in detail in the following specification, and is illustrated in the accompanying drawings forming part thereof, and in which,

Figure 1 is a top plan view of a lock mechanism of the unit type embodying the improvements of the present invention, the dead bolt being shown in retracted position. Fig. 2 is a similar view with the dead bolt projected. Fig. 3 is a reverse bottom plan view of the parts shown in Fig. 1. Fig. f is a rear end elevation of the lock mechanism shown in Fi g. 1, the cover plate being broken away to disclose the interior. Fig. 5 is a vertical section taken'on the line 5'5 of Fig. 1. Figs. (3, 7 and 8 inclusive show details of the lock mechanism. Fig. 9 is an end elevation of the cylinder lock mechanism, Fig. 10 is a vertical section therethrough on the line 101O of Fig. 9. Fig. 11 is an end elevation of the cylinder lock mechanism with the controlling parts moved from the position shown in Fig. 9 by a key of the second class, the parts being moved to,

bolt projected position. Fig. 12 is a plan view of keys of the second and third classes used in connection with said cylinder lock mechanism.

Referring to the drawings by numerals, 1 indicates the inside escutcheon plate, and 2 the outside escutcheon plate, between which the lock frame is held by suitable conmeeting screws, in the usual manner as ployed in unit locks. This lock frame embodies'the face plate 3 which has extending transversely therefrom spaced frame plates 3 these plates having suitable interconnect ing webs as shown. The frame plate 3 on the inside of the lock, carries an outwardly extending sleeve 1, for guiding the spindle P of the inside knob 4, this sleeve extending through the inner escutcheon 1. The opposite frame plate 3 carries a similar sleeve, which extends, in turn, through the outer cscutcheon 2 for guiding the knob spindle 5 of the ouside knob 5.

A pivoted latch bolt 6 is carried by the face plate 3 and is pivotally attached thereto, the usual plunger guiding in a web of the lock frame. The bolt is, normally projected through the coil spring 7 on said plunger operating between the frame web and the bolt head. T he plunger tern'iinates in a U-shaped yoke member 8, having laterally offset end portions 8 positioned at opposite sides of the terminalsof the knob spindles 1- and 5. Below the latch bolt the face plate 3 of the lock frame carries a pivoted or tilting stop work member 9, in the form of a walking beam, one end ofthe beam having pivoted thereto the forward end of a link 10, the rear end of which is bent downwardly and carries a pin 11, arranged, in one position on the walking beam, to extend into a recess in the outer knob spindle 5, to lock said knob spindle against turning. This knob spindle, when not locked against turning by the pin 11, is arranged to retract the latch bolt, and to this end has its inner end notched to receive and rotate therewith a roll-back 12,.the opposite arms of which are arranged to engage the offsets 8 of the yoke, to retract the latch bolt when the knob is turned. (See Fig. At the opposite side of the lock frame the knob spindle at terminates, and, in turn, is notched to receive a similar roll-back 13, which cooperates with the offsets 8 at the side of the said offsets opposite the first rollback 12. This roll-back 13 is operable at all times by the inside knob to retract the latch bolt.

l-l designates a dead bolt arranged to be projected through the face plate 3 of the lock frame, and having a shank 15 extend ing rearwardly in the lock frame, and suitablv guided therein. Intermediate its ends, this shank; has one side cut away to provide a lug 16, which I term a retracting lug, and a shoulder 17 spaced therefrom, which I may term a projecting shoulder. The forward or projecting movement of this dead bolt may be limited by suitable stop means, such as by a cotter pin 19. This dead bolt is moved to projected and retracted position through the following mechanism. At a point above the dead bolt, a rock shaft 20 is journaled between the plates 3 of the lock frame, one end j ournaling on a pin 21 carried by the frame plate, and the other end journaling upon the hub of certain stop-work controlling mechanism operated through the said rock shaft, as will be later explained. At the end opposite the pin 21, the rock shaft 20 is provided with a cam arm 22, having on one face thereof a cam 23 constructed to extend between the lug 16 and the shoulder 17 of the shank of the dead bolt, to engage these parts when the shaft 20 is rocked to retract and project the dead bolt. This same end of the rock shaft is recessed to provide a socket 2 1, within which is a further and inwardly extending squared socket 25, the first-named socket journaling on the hub of a stop work controlling arm 27. This same end of the rock shaft is flattened on opposite sides as 26 (Fig. 8), and a leaf spring 26 anchored in the frame engages these flat sides and tends to retain the shaft in bolt projected and retracted positions. At the end of the rock shaft opposite the cam arm 22, a bifurcated crank arm 28 is provided, extending from the shaft at an angle to the crank arm 22. The forward end of the pitman bar 29 is pivoted to this bifurcated crank, the bar extending rearwardly and upwardly, and terminating at a point above the upper offset 8*" of the latch bolt yoke. Adjacent this end of a pitman bar it is provided with a depending right angular arm 30, which extends beneath and beyond the under face of the upper offset 8, and terminates in an upwardly extending hook or abutment 31. This abutment is positioned in the plane of the offset 8, and is adapted to be engaged thereby in one position, and in one cycle of operation of the parts. A wear plate 32 is preferably attached to the rear end of this upper offset 8 of the yoke. The under edge of the arm 30 is notched as at 33 (Fig. 3), to receive a roll-back controlled by a key from the outer side of the look, as

will be hereinafter explained.

Attached to the rear end of the pitman bar 29 and depending therefrom, is an angular dog 34, the lower end of this dog being positioned in line with the upper offset 8 of the yoke. A coiled spring 35 is carried by the abutment bar and connected to the end of the dog 34:, normally tending to move said dog forwardly and against a pin 36, carried by the lower arm 30 of the pitman bar; As this dog is pivoted to the pitman bar, it may be moved independently of the bar and against the yoke offset to move it in a direction to retract the latch bolt.

The outer knob 5 carries a cylinder lock mechanism, the casing of this look being designated by the numeral 37. This cylinder lock is of a peculiar construction and employs a rotatable plug element 37*, and inner and outer concentric sleeves. The end of the plug 37, in the direction of the lock mechanism, carries a sleeve ll which has a socket therein and which also has an offset shouldered member or disk 38, having its edge cut away to provide shoulders .39 and 40.

13 indicates the inner sleeve of the lock; l i the outer sleeve, both sleeves terminating back of the disk 38 (shown in Figs. 9, 10 and 11 of the drawings), there being a clearance space between these sleeve faces and the adjacent face of said disk.

Seated against the end faces ofthe sleeves,

and back of the disk 38, is a connector block 45 of a width equal substantially to the combined width of the sleeves, said block having therein a pin 16, which extends between the cut away edge of the disk and the casing of the cylinder lock, and in the line of move ment of the shoulders 39 and 40 of the disk 38. The outer sleeve carries a pin 48 and the inner sleeve carries a similar pin 47, likewise arranged to engage the connector block, these pins both clearing the inner face of the disk and clearing each other as the sleeves move relatively. The disk 38 carries on its adjacent face a pin 19, arranged to engage the pin {17 of the inner sleeve, when the disk is rotated. 50 designates a roll-back spindle seating in the socket 42 of the plug sleeve, and extending through the outer knob sleeve 5 and through the outer roll-backs 12 and 13. This spindle will rotate when the plug is rotated, the manner of rotation of said plug being governed by the class of the key used. I On the inner end of this spindle, adjacent and inwardly of the roll-back 12, I mount a rollback 51, which is positioned in line with the pivoted dog 34 of the pitman bar. Rotation of this roll-back 51 to the left (Fig. 5) will engage said dog and move it, independently of the pitman bar, to engage the upper ofiset 8 of the latch yoke to retract the latch. Adjacent and inwardly of this latch rollback, the spindle 50 carries a dead bolt rollback 52, positioned in line with the notched edge 33 of the lower arm 30 of the pitman bar. The rotation of this roll-back v52, in opposite directions, moves the pitman bar to project and retract the dead bolt. 7

The amount in direction of rotation of the spindle 50 and the roll-

back members

51 and 52 carried thereby, will depend upon the class of key used; A key of the first class,

llO

such as 53 (Fig. will be so bitted as to position the pin tumblers to permit the rotation of the plug 3'7 only. This, of course, will rotate the sleeve 41 and the spindle 50. It will be noted that in Fig. 5 of the drawings the roll-back 51 must be turned in a counterclockwise direction to engage the dog 34 and retract the latch bolt. The controlling parts of the cylinder lock mechanism, as shown in Fig. 9, are reversed as regards the viewpoint of Fig. 5, so that the disk 38 I will move in a clockwise direction when the key of the first class is inserted in the cylinder lock and turned to retract the latch bolt. This movement of the disk 38, as seen in Fig. 9, is for a half revolution only, inasmuch as the shoulder 39 of said disk will engage the pin 46 of the connector block at the end of a half revolution, the connector block being held against movement in clockwise direction by reason of the pin 48 of the outer sleeve. The disk 38 then, in latch retracted position, will be positioned as indi cated in dotted lines in Fig. 9. It may not be turned to the left or counterclockwise from the position shown in. full lines in Fig. 9, by reason of the fact that the pin 49 proj ecting from the rear face of the disk will be stopped from movement in that direction by the pin 47 of the inner sleeve 43. Conse quently the only movement possible when the key of the first class is used is to the right in Fig. 9, and this movement is suflicient to permit the movement 0]": the rollback 51 to engage the dog 34 and retract the latch bolt. (See Fig. therefore, that keys of the first class may be used to retract the latch bolt from the outside of the lock when the outside knob is locked against latch retracting movement through the stop work mechanism.

Keys of the second class will operate both the latch bolt and the dead bolt. A key of this second class, such as 54, Fig. 12, when inserted in the cylinder lock will position the innermost set of pin tumblers to break on the outer edge of the inner sleeve 43 and 01' the plug, so that this sleeve and the plug 37 are coupled and may rotate in unison. This will, of course, rotate the spindle 50 and the roll-

backs

51 and 52. A key of the second glass, in order to retract the latch bolt is merely turned in a similar direction as a key of the first class, the disk 38, inner sleeve 43 and its pin 47 rotating in unison until the shoulder 39 of the disk engages the pin 46 in the same manner as described in connection with the latch retracting movement on the part of a key of the first class. To project the dead bolt through a key of the second class, the latter is inserted in the cylinder lock and turned to move the inner sleeve 43, its pin 47 and the disk 38 to the left from the position shown in full lines in Fi 9, to the full line position shown in Fig.

It will be seen,

11, the shoulder 40 of the disk engaging the pin 46 01 the connector block, carrying said connector block around for not quite a full revolution, and until it engages the pin 48 of the'outer sleeve 44 which does not rotate. During this movement of the parts the spindle 50, as viewed in Fig. 5, will be turned almost a full revolution to the right, the rollback 52 engaging in the notch 33 of the pit man bar, moving said bar to swing the rock shaft 20 in a direction to project the dead bolt. The key may now be withdrawn and the dead bolt will be in projected position. In this bolt projecting rotation of the spindle 50, the roll-back 51 has been turned through almost a full revolution, but not to re-posi tion its-operative end, as viewed in Fig. lo the right of the depending end of the dog 34. Consequently, if it is attempted to retract the latch bolt from the outside when the dead bolt has been projected by a key of the second class, the key of the first class will turn the roll-

backs

51 and 52 to the left, as viewed in Fig. 5, the cylinder lock controlling parts moving from the position shown in Fig. 11 in a clockwise direction and for slightly more than a half revolution, the shoulder 39 of the disk 38 engaging the pin 46 of the connector block and moving said block until it is stopped by the pin 47 of the inner sleeve. This amount of movement is insullicient to retract the dead bolt by means of roll back 52 and to bring the roll-back51 around again to a position to the right of the dog 34, in Fig. 5, so that a further movement may retract the latch bolt. Therefore, when the dead bolt has been projected by a key of the second class, the latch bolt may not be subsequently retracted by a key of the firstclass.

The dead bolt may, of course, be retracted by a key of the second class, by inserting said key and moving the parts, as seen in Fig. 11, from the position shown in full lines in that figure in a clockwise direction around to the position shown in full lines in Fig. 9. In this position of the parts the key may be withdrawn, or, if it is desired to retract the latch bolt, the movement may be continued in the same direction until the shoulder 39 engages the pin 46, as heretofore stated in connection with the latch retracting movement, through a key of the first class. If this is done, the key is then turned back to bring the parts in the position shown in full lines in Fig. 9, whereuponthe key may be withdrawn, the dead bolt having been retracted and then the latch bolt, so that the door may be opened. It will be noted that the dead bolt may be retracted by retracting the latch bolt, the offset 8 engaging the hooked end 31 of the pitman bar during latch retracting movement to move said b'a r in a direction 'to retract the dead bolt. When the dead. bolt is projected as by a key of the second or third classes, it may not be so retracted from the outside by a key of the first class operating to retract the latch bolt. This is prevented because the dog 3% 5 in dead bolt projected. position of the pitman is beyond the arc of movement of the rollback 51. A. key of the second class therefore operates to project and retract the dead bolt, and also to block retraction of the latch bolt through a key of the first class when the dead bolt is projected by a key of the second class.

. A key of the third class, such as 55, Fig. 12, will, like thekeys of the second class, operate both the latch bolt and the dead bolt. In addition it will operate as a shut out key and will block retraction of the dead bolt through keys of the other classes. Its operation when inserted in the cylinder lock is to position the pin tumblers to break on the outer edge of the outer sleeve 14, coupling both sleeves and theplug together so that when the key is turned these parts rotate as a unit and there is no relative movement of the sleeves with their pins and the disk.

Referring to Fig. 9 of the drawings, when a third class key is inserted in the cylinder and turned in a direction to project the dead bolt, the sleeves, plug and disk, as viewed in Fig. 9, will make a complete revolution in a counterclockwise direction, returning to the same position shown in full lines in Fig. 9, so that the third class key may be with- 85 drawn. This movement of the parts, as in the case of the second class key, will turn the spindle 50 and roll-back 52 so that the latter engages in the notch 33 of the pitman bar and moves said bar to project the dead 4 bolt. In the bolt projected position of the parts, as seen in full lines in Fig. 9, it is impossible to now retract the bolt by a key of the second class- Such a retracting movement by such a key would have to be in a clockwise direction, as viewed in Fig. 9, but with this second class key, it is only possible to make a half revolution in bolt retracting direction, and this is insufficient to retract the dead bolt. This half'revolution will take the inner sleeve 43 and disk 38 with their pins from the solid line position shown in Fig. 9 to the dotted line position of the disk, where further movement is stopped by the connector block 45 and pin 48 of the outer sleeve. Retraction of the latch bolt through this second class key or through a key of the first class and therefore retraction or the dead bolt through the hooked end 31 of the pitman) is impossible, as the dog 34, in bolt 0 projected position of the pitman bar is beyond the arm oi. movement of the roll-back 51. The dead bolt may be, of course, retracted by inserting the third class key and turning it to move the parts, as viewed in Fig. 9, 439 an a clockwise direction-for a full revolution,

the parts being turned to the full line position shown in Fig. 9 and being conditioned for bolt and latch operation by keys of the second and first classes. Until the dead bolt has been retracted and the parts so moved by a third class key, the lock is absolutely 1shut out against the operation of the other :eys.

The dead bolt may be operated from the inside of the lock by means of a thumb turn, designating the spindle of the thumb turn which extends through the escutcheon 1 and through the controlling arm 27 into the squared socket 25v of the rock shaft 20, so that when said thumb turn is rotated through its finger piece 61 the rockshai't is turned to project and retract the deadbolt. Projection and retraction of the dead bolt through the oscillation of the rock shaft may be utilized to operate an indicating member 35 in the form of a button 56 projecting through an aperture in the outer escutcheon plate 2, this button having its'inner end beveled at 57 to cooperate with a beveled edge or cam surface 58 on the rock shaft 20, this cam operating against the end 57 of the button to force said button outwardly when the dead bolt is'projected, thereby serving as an indication that the door is locked against the outside knob and key of the first class. The button 56 is normally moved inwardly by means of a suitable spring 59. j

From the foregoing it will be evident that I have embodied in a lock mechanism a control by three diiferent classes of keys,one class being utilized to operate the latch bolt, and the second and third classes being uti-' lized to operate the dead bolt and the latch bolt, the second and third classes being superior to the first class, and the third class being superior to the second. This control is secured in part to a cylinder lock mechanism of improved construction, the advantages of which will be obvious.

While I have herein described a specific embodiment of my invention, it will be understood that the same is susceptible of variation both in structure and in relative arrangement of parts within the spirit of the invention and the scope of the appended claims.

buch parts of my invention as are herein shown or described and not claimed are specifically described and claimed in my copending applications Serial Nos. 863,637 and 856,896 filed, respectively, Sept. 26, 191 1, and August 15, 1914.

l/Vhat I claim and desire to secure by Letters Patent is,-

1. In a look, a latch bolt, a dead bolt, means controlled by a key of one class for operating said latch bolt only, means controlled by keys of second and third classes for operating said dead bolt and including means controlled by a key of one of said 3 last-named classes for blocking retraction of said dead bolt through keys of the other of said classes.

2. In a look, a latch bolt, a dead bolt, means controlled by a key of one class for operating said latch bolt only, means controlled by keys of second and third classes for operating both said dead bolt and said latch bolt and including means controlled by a key of one of said last-named classes for blocking retraction of said dead bolt through keys of the other of said classes.

3. In a lock, a latch bolt, a dead bolt, means controlled by a key of one class for operating said latch bolt only, means controlled by a key of a second class for operating said dead bolt and for blocking the retraction of said latch bolt by a key of the first class when said dead bolt is projected by a key of said second class, and means controlled by a key of a third class for operating said dead bolt and for blocking its subsequent retraction by keys of the other of said classes.

4. In a look, a latch bolt, a dead bolt, means controlled by a key of one class for operating said latch bolt only, means controlled by a key of a second class for operating both said dead and latch bolts and for blocking the retraction of said latch bolt by a key of said first class when said dead bolt is projected by a key of the second class, and means controlled by a key of a third class for operating both said dead and latch bolts and for blocking the subsequent retraction of said dead bolt and of said latch bolt by keys of the other classes.

5. In a lock, bolt mechanism including a latch bolt and a dead bolt, a cylinder lock, means controlled through said cylinder look by one class of keys for operating said latch bolt only, means controlled through said cylinder look by a second class of keys for operating said dead bolt and said latch bolt also, and means controlled through said cyl inder look by a third class of keys for operating said dead and latch bolts and for blocking the subsequent retraction of said dead bolt by the operation of a key of the second class.

6. In a lock, bolt mechanism including a latch bolt and a dead bolt, a cylinder lock, means controlled through said cylinder look by one class of keys for operating said latch bolt only, means controlled through said cylinder look by a second class of keys for operating said dead bolt and said latch bolt and including means for blocking the retraction of said latch bolt by a key of the first class when said dead bolt has been pre-' viously projected by a key of said second class, and means controlled through said cylinder look by a third class of keys for operating said dead and latch bolts and for blocking the retraction of sald dead bolt by a key of the second class when said bolt has been previously projected by a key of said third class.

7. In a lock, bolt mechanism including a latch bolt and a dead bolt, a cylinder lock, means controlled through said cylinder lock by one class of keys for operating said latch bolt only, means controlled through said cylinder lock by a second class of keys for operatingsaid dead bolt and said latch bolt also, and means controlled through said cylinder look by a third class of keys for operating said dead and latch bolts and for blocking the subsequent retraction of either of said dead bolt or said latch bolt by the operation of a key of said second class.

8. In a lock, bolt mechanism including a latch bolt and a dead bolt, a cylinder lock, means controlled, through said cylinder look b one class of keys for operating said latch bolt only, means controlled through said cylinder look by a second class of keys for operating said dead bolt and said latch bolt also, and means controlled through said cylinder look by a third class or" keys for operating said dead and latch bolts and for blocking the subsequent retraction of either said dead bolt or said latch bolt by the operation of keys of the iirst and second classes.

9. In a lock, bolt mechanism including a latch bolt and a dead bolt, a cylinder lock, mean controlled through said cylinder lock by one class of keys for operating said latch bolt only, means controlled through said cylinder look by a second class of keys for operating said dead bolt and said latch bolt and including means for blocking the retraction of said latch bolt by a key of the first class when said dead bolt has been previously pro ected by a key of said second class, and means controlled through said cylinder look by a third class of keys for operating said dead and latch bolts and for blocking the retraction of said dead bolt or said latch bolt by keys of said first and second classes when said dead bolt has been plreviously projected by a key of said third 0 ass.

10. In a lock, bolt mechanism including a latch bolt and a dead bolt, a cylinder look, a bolt' operating spindle in operative connection therewith and rotated therethrough, opcrating connections between said spindle and said latch and dead bolts, means controlled through said cylinder look by one class of keys for rotating said spindle in a direction and to an extent to retract said latch bolt only, means controlled through said cylinder lock by second and third classes of keys for rotating said spindle in opposite directions and to an extent to project and retract said dead bolt, with means controlled through said cylinder look by a key of one of said last named classes for blocking subsequent retraction of saiddead bolt by keys of the other of said classes.

7 11. In a lock, bolt mechanism including a latch bolt and a dead bolt, a cylinder look, a bolt operating spindle in operative connection therewith and rotated therethrough, operating connections between said spindle and said latch and dead bolts, means controlled through said cylinder look by one class of keys for rotating said spindle in a direction and to an extent to retract said latch bolt only, means controlled through said cylinder look by second and third classes of keys for rotating said spindle in opposite directions and to an extent to project and retract said dead bolt and to retract said latch bolt, with means controlled through said cylinder lock by a key of one of said last-named classes for blocking subsequent retraction of said dead bolt and retraction of said latch bolt by keys of the other of said classes.

12. In a look, bolt mechanism including a latch bolt and a dead bolt, a cylinder look, a bolt operating spindle in operativeconnection therewith and rotated therethrough, operating connections between said spindles and said latch and dead bolts, means controlled through said cylinder lock by one class of keys for rotating said spindle in a direction and to an extent to retract said latch bolt only, means controlled through said cylinder look by a second class of keys for rotating said spindle in opposite directionsand to an extent to project and retract said dead bolt and to retract said latch bolt, and including means arranged to block retraction of said latch bolt through said first class of keys when said dead bolt has been projected through a key of said second class, and means controlled through said cylinder by a third class of keys for rotating said spindle in opposite directions and to an extent to project and retract said dead bolt and retract said latch bolt, and including means for blocking subsequent retraction of said latch and dead bolts by a key of said second class. V

13. In a lock, bolt mechanism including a latch bolt and a dead bolt, a cylinder look, a bolt operating spindle in operative connection therewith and rotated therethrough, op-

erating connections between said spindles and said latch and dead bolts, means controlled through said cylinder lock by one class of keys for rotating said spindle in a direction and to an extent to retract said; latch bolt only, means controlled through 1 said cylinder lock bya second class of keys for rotating said spindle in opposite directions and to an extent to project and retract said dead bolt and to retract said latch bolt,

and including means arranged to block retraction of said latch bolt through said first class of keys when saiddead bolt has been projected through a key of said second class,

by a third class of keys for rotating said spindle in opposite directions and to an ex-, tent to project and retract said dead bolt and retract said latch bolt, and including means for blocking subsequent retraction of said latch and dead bolts by a key of said second class, and retraction of said latch bolt by a key of said first class.

14. In a cylinder look, a rotatable plug, means controlled and operable by one class of keys for rotating said plug in one direction only and for less than a complete revolution, means controlled and operable by keys of second and third classes for rotating said plug in opposite directions and for complete revolutions, with means controlled by a key of one of said last-narned classes, and operable upon a complete revolution of said plug in one direction thereby to block a subsequent complete revolution of said plug in a reverse directionby keys of the other of said classes.

15. In a cylinder look, a rotatable plug, means controlled and operable by one class ofkeys for rotating said plug in one direction only and for less than a complete revolution, means controlled and operable by" 16. In a cylinder look, a casing, a rotatable plug therein having a keyhole slot, inner and outer sleeve members within said casing and inclosing said plug, pin tumbler mechanism cotiperating with said sleeve members and said plug, said tumbler mechanism being operable by keys of three different classes to permit the-independent rotation of said sleeve members and the rotation of said plug independently of said sleeve members, annularly spaced abutment members carried by said sleeves and rotated therewith in unison with andindependently 01 each other, an abutment member carried by and rotating with said plug and in the path of movement of one of said sleeve abutments, and aloose coupling member rotatable by said plug and in the plane of said sleeve abutments and bridging the arcuate space therebetween, said'coupling member lying in the path of movement of said plug, said plug having alimited free movement relative to said coupling member.

17. In a cylinder lock, arotatable plug,

means. controlled. and operable by one class of keys for rotating'said plug in one certain direction only and only for less than a complete revolution and for an operating cycle, means controlled and operable by keys of each of second and third classes for rotating said plug in opposite directions for complete revolutions and through complete operating o cles and including means controlled by a key of one of said last named classes and operable upon a complete revolution of said plug in one direction through said key, to block a subsequent complete reverse revolution of said plug through keys of the other of said classes.

18. 111 a cylinder look, a rotatable plug, means controlled and operable by one class of keys for rotating said plug in one certain direction only and only for less than a complete revolution and for an operating cycle, means controlled and operable by keys of each of second and third classes for ro-- tating said plug in opposite directions for complete revolutions and through complete operating cycles, and including means controlled by one of said last named classes of keys whereby said plug may be freely ro tated in opposite directions, said means, upon the operation of the plug through a complete revolution and operating cycle, being operable to block reverse revolution for the reverse cycle through any of the other classes of keys.

19. In a cylinder look, a casing, a rotatable plug therein having a key slot, inner and outer sleeve members inclosing satid plug, pin tumbler mechanism cooperating with said sleeve members and said plug, said tumbler mechanism being operable by keys of three different classes to permit the joint and independent rotation of said sleeve members with said plug, and the rotation of said plug independently of said sleeve members, spaced abutments carried by said sleeve members and rotating therewith, an abutment member carried by and rotating with said plug and positioned in the path of rotation of on of said sleeve abutments, a loose coupling member positioned in the plane of said sleeve abutments and bridging the arcuate space therebetween with means of connection between said plug and said coupling member, said connecting means afiording limited relative movement between said plug and coupling member.

ERNEST L. TEICH.

Witnesses VVILLIAM V. CoLLINs, NEWTON Gr. CURTIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.