US1137210A - Lock. - Google Patents

Description

N. B. HURD.

LOCK.

APPLICATION FILED Jun 3, 1914.

Patented Apr. 27, 1915.

4 SHEETSSHEET 1- THE NORRIS PETERS CO-, FHOTO-LITHOH WASHINGTON. D, C.

N. B. HURD.

LOCK.

APPLICATION FILED mus. 1914.

Patented Apr. 27, 1915.

4 SHEETS-SHEET 2- THE NuRR/S PETERS 60.. PMOTO-LITHQ, WASHINGTON. D. c.

N. B. HURD.

LOCK.

1,137,210. APPLICATION FILED JULY 3, 1914. Patented Apr. 27, 1915' 4 SHEETS-SHEET 3.

Q/Vi lme/weo avwemmz 0 H J75r/7za/z 5 Hard Y I I I ,1 I I THE NORRIS PETERS O.. PHO7D-LITHO WASHINGNN. D C.

unrrn STATES rare 1 ion NORMAN B. HUBI), OF NEW BRITAIN, CO

NNECTICUT, ASSIGNOR TO THE AMERICAN CONNECTICUT.

LOCK.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed July 3, 1914. Serial No. 848,845.

ToaZZ whom it may concern Be it known that I, NORMAN B. HURD, a" citizen of the UnitedStates, residing at New Britain, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Locks, of which the'following is a full, clear, and exact description.

This invention relates-to locks and particularly to an improved lock construction affording a plural key-control of a particularly advantageous character; and-including also an improved form of thumb bolt control as will be seen from the detailed specification following and from the accoms panying drawings forming part thereof and illustrating a preferable embodiment of the invention.

In these drawings, Figure 1 is a view in elevation of a mortise lock embodying the improved structure of the present invention, the cover plate of the lock casing being removed to disclose the interior construction. Fig. 2 is an elevation of the lock with the cover plate removed and withthe thumb bolt projected through the thumb turn, the emergency tumbler and latch bolt mechanism being removed. Fig. 3 is a view similar to Fig. 2 but with the thumb bolt in the process of retraction through the key bolt and the mechanism controlled by acer-. tain key. Fig. l is a-view in elevation, showing the key bolt in process of projection by an other and certain key and with the blocking member in process of movement to blocking position. Fig. 5 is a view similar to Fig. t but with the key bolt projected by the key of Fig. l and with the blocking member in key bolt blocking position. Fig. 6 is a vertical section on the line 66 of Fig. 1. Fig. 7 is an enlarged detail view in elevation of the specific form of cylinder lock mechanism employed, parts being shown in section. Figs. 8, 9 and 10 are plan views of three different keys which may be employed in conjunction with the cylinder lock and which aretypical of three different controls. Figs. 11 to 14 inclusive are detail views of parts of the mechanism within the lock case.

Referring to the drawings by numerals, 1 indicates the lock case, 1 the cover plate thereof, and 2 the face plate of said case, these parts being generally of standard construction. Mounted in the lock case for reciprocation, and arranged to extend through the face plate as usual, is a key bolt 3 having its upper edge notched as at 4; for cooperation with the tumbler mechanism and with the roll back of the cylinder look as will be seen. The key bolt 3 is longitudinally slotted to cooperate with the usual fixed post or fence 0 carried by the lock case and on which the key bolt guides. Pivotally mounted on this key bolt adjacent its forward end is a tumbler 6 of usual construction, having the offset lug 6 extending over and within the notched edge 4: of the key bolt, and having on its outer face a lug 6 designed to cooperate with a second and emergency: tumbler 7. This second tumbler 7, has a sliding slotted engagement with the pivot of the first tumbler 6 as at 7*. Both the tumblers 6 and 7 are gated in the usual manner to cooperate with the fixed fence 5 of the lock case. The tumbler 7 lies in a different operative plane from the tumbler 6. The rear face of the tumbler 7 is cut away at 7 to form a guiding wall designed to rest over the lug 6 of the first tumbler 6, so that when the second tumbler 7 is depressed, the first tumbler 6 will be likewise depressed, so that both tumblers may be moved to clear the fixed fence 5 simultaneously and by key controlled means which will operate the second tumbler 7. It will also be observed that the curved guiding wall 7 permits the gfirst tumbler 6 to be moved outwardly with the bolt independently of the second tumbler, the lug 6 in this instance, riding over the curved wall 7 as will be readily apparent. When the two tumblers are depressed, and the key bolt projected outwardly, the tumbler 6 will be positively carried outwardly by the bolt and its lug 6 engaging with the wall 7 of tumbler 7 will move this tumbler outwardly with it, positioning the gated portionsof both tumblers on the opposite side of the fixed fence 5 and blocking retraction of the bolt until both said tumblers have been moved to free the gated portions from said fence. This second tumbler 7 cooperates with certain thumb bolt mechanism hereinbefore described, and to that end is extended downwardly and rearwardly, being rovided with a releasing shoulder 8 and with a thumb bolt arm 9, these parts being preferably integral with the tumbler 7. This thumb bolt is designated by 10 inthe drawings, its upper end being notched at 11 to receive the arm 12 of a thumb turn hub 13 suitably journaled in the lock-case. The arm 12, when the hub is turned,'operating to engage with the sides of the notch 11 and move the thumb bolt to projected and retracted position, the tumbler mechanism of the key bolt being suitably controlled, as will be seen. The thumb bolt is suitably guided in the lock case, and has its inner face slotted at 14 to receive the lower end of a walking beam'1'5, pivotally mounted intermediate its ends in the lock case, and having its upper end engaging in a notch 16 formed in the lower edge of the key bolt 3, so that when the thumb bolt is projected,

- the projection of the key bolt by'said keys will, through this walking beam, retract the thumb bolt, the key bolt being subsequently and independently retractable by the key used owing to the slotted connection at 16 with the upper end of the walking beam, this slotted connection permitting relatively free movement under such conditions.

The thumb bolt has pivotally mounted upon its face, a pivoted spring pressed pressure bar 17 whose upper edge engages the end of the long arm 18 on the thumb turn hub 13, this arm being positioned in the plane of the presser bar 17. The arm 12 of this hub which engages with the notch in the thumb bolt and serves to reciprocate said bolt, is positioned directly below and in line with the arm 18, (Fig. 14) but is substantially shorter, so that the arm 18 will overlie the face of the thumb bolt and will engage with the upper edge of the presser bar 17. Extending substantially at right angles to the arm 18, is an offset tripping arm 19 arranged to cooperate with the releasing shoulder 8 of the emergency tumbler 7. A second spring 20 bears against the lower edge of the pressure bar 17 and holds it against the edge of the arm 18 with a substant al degree of pressure. The arm 18 is of suflicient height on the hub 13 to project beyond the face of the pressure bar so as to present the upper portion of its edge to the'tumbler arm 9. WVhen the thumb bolt is projected, the arm 12 which operates the thumb bolt, will be positioned as shown in Fig. 2 of the drawings, and will be maintained in such posttion with considerable force by the pressure of the bar 17 against the lower edge of the arm 18. In this position rearward or retracting movement of the thumb bolt will act against the arm 12 in a line radial to the hub 13, this arm and hub being maintained in such position by the presser bar 17. Consequently, inasmuch as the retracting pressure is in line with the dead center of the thumb turn hub, the thumb bolt will be blocked against retraction by this dead center position of the actuating arm 12, and can only be retracted when this arm 12 has first been moved from this dead center position.

Ordinarily, the emergency tumbler 7 will be supported in a position tocooperate with the fence because of the supporting engagement of the lug 6 of the first tumbler 6, with the wall 7 on the under face of the second or emergency tumbler. Assuming that both the key and thumb bolts are in retracted position, and it is desired to project the thumb bolt from the inner side of'the lock, the thumb turn hub 13 is turned through a thumb turn 45 or other suitable manually operable means, the thumb bolt being moved from the position shown in Fig. l to that shown in Fig. 2, the arm 18 depressing the presser bar 17 and arm 12 engaging with the sides of the notch 11 to move the thumb bolt to projected position. lVhen this movement takes place, the arm 18 will engage the finger 9 of the emergency tumbler 7 and will depress both said emergency tumbler and the first tumbler 6, so that their gated portions will clear the fixed fence 5, and so that, if the key bolt were previously projected with the parts in the position shown in Fig. 1, it will be retracted through the walking beam 15, the parts moving from the position shown in Fig. 1 to that shown in Fig. 2 in which position the arm 12 will be held on a dead center by the presser bar described, and the thumb bolt can only be retracted from the opposite face of the lock by means of key. controlled mechanism which will move the hub 13 and arm 12 from dead center. I will now take up the key control mechanism for effecting this result.

In the upper portion of the lock above the key bolt 3 and tumbler mechanism, a cylinder lock embodying a rotatable plug cooperates with the usual spring pressed pin tumblers. The inner end of this rotatable plug 22 isshouldered to receive thereon a roll back 23 having a recess in its rearface and lower end arranged to fit over the shouldered end of the plug and having its opposite face channeled at 24 and provided with opposite vertical grooves 25 therein arranged to receive a vertically sliding plate 26 carrying at its upper end and offset from the body of the rollback 23 a head or second roll back 27. The lower end of this plate 26 is provided with a transverse offset, forming a contact or strike surface 26 the extremity of this offset being turned down wardly to provide a second contact or strike edge 28 in a plane below the strike edge 26*. The rear upper portion of the main cam 23 is provided with a spring pocket or groove 29 therein, housing a coil spring 30 whose upper end bears against the cam body 23 and whose lower end engages a pin 31 rigidly carried by and extending transversely from the rear face of the plate 26. This spring normally presses the pin 31 against the upper face of the extension 22 of the plug and normally holds the plate 26 and the second cam 27 in the lowermost ofthree positions relative to the first cam 23 and roll back, this plate and second cam being movable in the guide-ways 25 and against the pressure of the spring 30 byreason of the engagement of certain keys with the strike edges 26 and 28 respectively.

The specific construction of roll backs is shown in detail in Fig. 7 of the drawings, the second and third of the three positions of the second cam 27 with its plate 26 being designated by dotted lines, the relative positions of the two types of actuating keys relative thereto being likewise so indicated. These keys are shown in Figs. 8, 9 and 10 of the drawings, wherein A designates one type of key which may be a short key; 3 designates another type of key which may be a long key; and C designates a still further type of key which may be also a long key and of different length relative to the first long key B. These keys cotiperate with the roll backs 23 and 27 to operate the bolt mechanism as follows: The key A of the short type is arranged to rotate the plug and roll backs in the full line position shown in Figs. 1 and 7. The roll back 23 rotates in the plane of the key bolt 3 and of the lug 6 of the tumbler 6. The second cam 27 in the position described, is in the plane of the emergency tumbler 7 but is an insufficient distance radially of the plug to engage with the upper edge of this emergency tumbler. Therefore, when a key of the A type is used, the roll back 23 only will engage with the tumbler mechanism, its action being to depress the first tumbler 6 and to engage the notch 4 to project the key bolt, the gate of the tumbler 6 being positioned on the opposite side of the fixed fence 5 and holding the bolt projected until the tumbler 6 is depressed and the bolt moved rearwardly again. This projected position of the key bolt by a key of the A type is illustrated in Fig. 1 of the drawings, in which it will be seen that the lug 6 of tumbler 6 has moved from position shown in Fig. 3 over the wall 7 of the emergency tumbler and to the position shown in Fig. 1. If, in this position of the parts it is desired to retract the key bolt from the opposite side of the door, a thumb turn hub 13 may be turned, the arm 18 first depressing the emergency tumbler 7 through its arm 9 and by reason of the engagement of said emergency tumbler with the lug 6 of the tumbler, the latter will be depressed also to clear the fixed fence. By this time, the arm 12 will have engaged the notched edge 11 of the thumb bolt and will have projected said thumb bolt as heretofore described,'the walking beam 15 serving to move the key bolt from the position shown in Fig. 1 to that shown in Fig. 2, which is the position now occupied by the parts, the thumb bolt being blocked against retraction through the projection of the key bolt through key A by reason of the dead center blocking action of arm 12. This is because the short key A will only depress the first tumbler 6 which moves independently of the emergency tumbler, so that the force transmitted by pressure'of the roll back against bolt 3, through walking beam 15 and against thumb bolt 10, is in a dead center line. Keys of class B, however, are shorter than keys of class C, but are long enough to engage the strike edge 26 of the plate 26, moving the second cam 27 to the lower of the two dotted line positions, indicated in Fig. 7. The keys of class B can, therefore, rotate the two cams 23 and 27 in these respective positions, this rotation of the cams acting against the emergency tumbler depresses said tumbler and also the tumbler 6 because of the lug 6 and the engaged wall 7 The projected position of the second cam 27 is such that it acts to depress the emergency tumbler a suflicient distance to cause its releasing shoulder 8 to engage with the tripping arm 19 of the thumb turn hub and to move said arm a sufficient distance to throw the arm 12 off center and to release said arm from blocking position (see Fig. 3). The continued rotation of the roll backs will engage with the key bolt 3 and will project said key bolt and through walking beam 15 will retract the thumb bolt (see Figs. 4 and 5). It will be evident that the keybolt maybe now retracted without causing any movement of the thumb bolt owing to the free movement afforded by the slot 16 as will be evident from Fig. 5 of the drawings. Thus keys of type Bv may be utilized to retract the thumb bolt from one side of the door when it has been projected from the opposite side. It will, of course, be understood that projection of the thumb bolt from one side serves to retract the key bolt which has been previously projected by a key of class B from the opposite side the emergency tumbler 7 which has been moved forward with the bolt and into the position shown in Fig. 5 being depressed and with key bolt is retracted through the walking beam 15.

A key of a third class such as the longer C, may be utilized not only to retract the key bolt when projected by keys of either of the two classes heretofore described, and to retract the thumb bolt when projected from the opposite side of the door, but this third class of keys may be utilized to lock out opening of the door on which the lock .is mounted from either side, although usually this applies mostly to the outer side. This is accomplished by projecting the key it tumbler 6 so that the bolt through means controlled through the key C and by blocking the subsequent retraction of said key bolt through means controlled only by key C or a key of the same class. To this end the lower edge of the key bolt adjacent its inner end is formed with a recess 32. Mounted in the lock case below the lower edge of the key bolt 3, is a blocking plate 33 having a portion of its face extending outward in the lock case and into the plane of the emergency tumbler 7 and in line with the rear portion thereof. This plate is provided with an abutment or stop lug 3e and is pressed against the under edge of the key bolt by a leaf spring 35, the abutment stop 34 seating in the recess 32 in the lower edge of the key bolt. This plate is guided adjacent its outer end by a pin 35 and at its inner end is provided with a hooked portion 36. In the position shown in Fig. l of the drawings, this hooked portion rests against the upper edge of a spring pressed latching plate 37 journaled upon the hub 13 of the thumb turn, this plate being provided adjacent its inner end with a stop shoulder 38, its end engaging the post 39 and being yieldingly held thereagainst by means of a coil spring 40 engaging a pin thereon. In its normal position, this plate will be carried by the key bolt and will move forwardly and rearwardly with said bolt during its projection and retraction, the plate 33 guiding on the stud 35 and on the upper edge of the latching plate 37. The second cam 27 when in its normal spring pressed position will not depress the emergency tumbler 7 a suflicient distance to en: gage its lower and rear edge with the face of this blocking plate 33. When, however, the longer of the long keys is used, the cam 27 will engage the emergency tumbler and will depress it until its lower edge engages the plate 33 and moves it downwardly to clear its abutment 3% from the recess of the key bolt so that as the key bolt is now projected, the plate 33 will not move forwardly therewith, but will be held pressed downwardly until the key bolt has been projected, whereupon it will be pressed upwardly by its spring to hold its abutment in the rear of the key bolt, the extremity of the plate being positioned closely adjacent the edge of the lock case, so that in the event it is attempted to retract the key bolt by any of the keys other than those of class C, the rear end of the plate 33 will be carried rearwardly by the key bolt a very short distance and will abut against the lock case, absolutely blocking retraction of the key bolt through any key other than that of the C type.

In order to prevent the blocking plate from being carried forward by frictional engagement with the key bolt, its hooked end 36 will be moved by the emergency tumbler from the position shown in Fig. 2 downwardly and over the latching shoulder 38 of plate 37-21 e., from the position shown in Fig. 2 to that shown in Fig. 4. vVhen' the key bolt has beenfully projected, the abutment stop 34 will be pressed upwardly by the spring 35- to the position shown in Fig. 5 of the drawings, where it will block the retraction of the key bolt as hereinbefore described. It will be evident that the bolt will not be retracted until the key of class C is used to again depress the latching plate 33'through the emergency tumbler, moving it fromthe position shown in Fig. 5 to that shown in Fig. 4: and subsequently retracting the key bolt in the usual manner, the abutment 34 snapping'up intothe recess 32 as the latter is brought in line therewith by the retraction of the bolt; As the blocking plate 33 is not moved forwardly with the key bolt when projected by keys of the class C, it will be evident that when the key bolt is thus projected and dead looked as hereinbefore described, itcmay not be retracted from the opposite side of the look by means of the thumb bolt, as the thumb turn tumbler 7 sufficiently to engageand depress plate 33. I

In Figs. 1 and 6 of the drawings I have shown the usual spring pressed latch 41 retracted through the usual yoke 42, which in turn is operated through the roll backs 4:3. controlled through the knobs -14 in the usual manner. This latch bolt andits actuating mechanism is of standard construction and need not be further and specifically described herein.

While I have herein described a specific embodiment of my invention, it will be understood that the same may be structurally modified within the spirit of the invention and the scope of the appended claims.

that I claim is 7 1. In a look, a dead bolt, means controlled by one of a plurality of keys for projecting and retracting said bolt, means controlled by another and'diiferent of said plurality of keys for projecting said bolt and for blocking its subsequent retraction through said first named key, and means controlled by a third and certain key of said plurality of keys for projecting said bolt and including means separate from the aforesaid keycontrolled bolt-operating means and cooperating with said bolt to block its subsequent retraction through said first and second named keys.

2. In a look, a dead bolt, means controlled by one of a plurality of keys for projecting and retracting said bolt, means controlled by another and different of said plurality of keys for projecting said bolt and for blocking its subsequent retraction through said first named key, and means controlled arm 18 does not depress the.

key and said by a third and certain key of said plurality of keys for projecting said bolt and including means separate from the aforesaid keycontrolled bolt-operating means and cooperating with said bolt to block its subsequent retraction through any other of said plurality of keys.

3. In a look, a dead bolt, means controlled by one of a plurality of keys for projecting and retracting said bolt, means controlled by another and different of said plurality of keys for projecting said bolt and for retracting said bolt when previously projected by said first and second mentioned keys and for blocking its subsequent retraction through said first named key, and means controlled of said plurality of keys for projecting said bolt and including means separate from the aforesaid key controlled bolt operating means and cooperating with said bolt to block its subsequent retraction through said first and second named keys.

a. In a lock, adead bolt, a plurality of I keys for operating said bolt, one of said keys being a short key and at least two other of. said keys being longer relative to said short key and of different relative lengths, means controlled by said short key for projecting and retracting said dead bolt, means controlled by one of said long keys for projecting said bolt and for blocking its subsequent retraction through said short key, and means controlled by the other of said long keys for projecting said bolt and blocking its subsequent retraction through said short first mentioned long key,

5. In a lock, a dead bolt, a plurality of keys for operating said bolt, one of said keys being a short key and at least two other ofsaid-keys being longer relative to said short key and of different relative lengths, means controlled by said short key for projecting and retracting said dead bolt, means controlled by one of said long keys'for projecting said bolt and for blocking its subsequent retraction'through said short key, and means controlled by the other of said long keys for retracting said bolt when previously projected through said short and first mentioned longrkeys and for projecting said bolt and blocking its subsequent retraction through said short key and said first mentioned long key.

6. In a look, a dead bolt, a cylinder lock mechanism cooperating therewith and including a plurality of keys, at least one of said keys being a short key and at least two other of said keys being longer relative to said short key or keys and of different relative lengths, means controlled by a short key for projecting and retracting said ,dead bolt, means controlled by the shorter of said two long keys for projecting said bolt and for blocking its subsequent retraction by a third and certain key through a short key, and means controlled by the other of said long keys for projecting said bolt and for blocking its subsequent retraction through said short and first mentioned long key.

7 In a look, a dead bolt, a cylinder lock mechanism coiiperating therewith and including a plurality of keys, at least one of said keys being a short key and at least two other of said keys being longer relative to said short key or keys and of differentvrelative lengths, means controlled by a short key for projecting and retracting said dead bolt, means controlled by the shorter of said two long keys for projecting said bolt and for blocking its subsequent retraction through a short key, and means controlled by the other of said long keys for retracting said bolt when previously projected through a short key or the first mentioned long key, and for projecting said bolt and blocking its subsequent retraction through any other and different key of said plurality of keys.

8. In a lock, a dead bolt, a tumbler cooperating therewith, an emergency tumbler cooperating with said first tumbler and bolt positioned in a difierent operative plane from said first tumbler and arranged in one position to block retraction o fsaid bolt, a movable blocking member cooperating with said emergency tumbler and bolt, a cylinder lock mechanism including a cam arranged to operate said first tumbler and bolt, a second cam in a different plane from the first and in the operative plane of said emergency tumbler, said second cam being movable relative to the first and to said Y emergency tumbler into at least three relative positions, with means normally holding said cam in one of said positions, at least one of saidplurality of keys being arranged to rotate saidfirst cam to project and retract said bolt, at least one other of said plurality of keys being arranged to move said second cam to a second position and to rotate the same to operate said emergency bolt, said tumbler being positioned upon bolt projection to block bolt retraction through said first cam and tumbler, and at least one further of said plurality of keys being arranged to movevsaid second cam to a third' position and to rotate saidcam to operate saidemergency tumbler and boltto project the latter ,and to position said blocking member to block subsequent retraction of said bolt through any other and different key of said plurality of keys.

9. In a lock, a dead bolt, means controlled by a plurality of keys and operable from one side of the lock for projecting and retracting said bolt, a, second dead bolt, means manually operable from the opposite side of the lock for projecting and retracting -said second bolt, means of connection between tumbler and said bolts whereby said second bolt may be retracted through the projection of said first bolt, and means positioned upon the manually controlled projection of said second bolt to cooperate therewith and block retraction thereof by projection of said first bolt through at least one of said plurality of keys. 7

10. In a look, a dead bolt, means controlled by a plurality of keys and operable from one side of the lock for projecting and retracting said bolt, a second dead bolt, means manually operable from the opposite side of the lock for projecting and retracting said second bolt, means of connection between said bolts whereby said second bolt may be retracted through the projection of said first bolt, and means positioned upon the manually controlled projection of said second bolt to cooperate therewith and block projection of said first bolt through at least one of said plurality of keys.

11. In a look, a dead bolt, means controlled by a plurality of keys and operable from one side of the lock for projecting and retracting said bolt, a second dead bolt, means manually operable from the opposite side of the lock for projecting and retracting said second bolt, means of connection between said bolts whereby said second bolt may be retracted through theprojection of said first bolt, andmeans'positioned upon the manually second bolt to cooperate therewith and block retraction thereof by projection of said first bolt through at least one of said plurality of keys, and means controlled by another and certain keyof said plurality of keys for moving said blocking means to inoperative position and for subsequently pro-- jecting said first bolt to retract said second bolt through the means of connection aforesaid, said connecting means permitting subsequent retraction of said first bolt without resultant projection of the second bolt.

12.In a look, a dead bolt, means controlled by a plurality of keys and operable from one side of the lock for projecting and retracting said bolt, a second dead bolt, means manuallyoperable from the opposite side of the lock for projecting and retract ing said second bolt, means of connection betveen. said bolts whereby said second boltmaybe retractedthrough the projectionof said first bolt and whereby said first bolt when projected by at least one of said plurality of keys, may be retracted through projection of said second bolt,the latter being subsequently and independently retractable, and meanspositioned upon'the manually controlled projection of said second bolt to cooperate therewith and block retraction thereof by projection of said first bolt through at least one of said plurality of keys.

controlled pro ection of said 13. In a look, a dead bolt, means controlled by plurality of keys and operable from one side of the lock for projecting and retracting said bolt, a second dead bolt, manually controlled means therefor operable from the opposite side of the lock and including a hub journaled in the lock, and a radial arm on said hub arranged to engage said second bolt to project and retract the same upon the manual actuation of the hub, means of connection between said first and second bolts whereby the second bolt may be retracted by the projection of the first bolt through certain of said keys, said radial arm upon projection of said second bolt being positioned on a dead center with the line of retracting movement of said second bolt to block retraction thereof and to block projection of said first boltby at least one of said plurality of keys.

14-. In a look, a dead bolt, means controlled by a plurality of keys and operable from one side retracting said bolt, a second deadbolt, manually controlled means therefor, operable from the opposite side of the lock and including a hubv journaled in the lock, and a radial arm on said hub arranged to engage said second bolt to project and retract the same upon the manual actuation of the hub, means of connection between said first and second bolts whereby the second bolt may be retracted by the projection of the first bolt through certain of said keys, said radial arm upon projection of said second bolt, being'positioned on a dead center with the line of retracting movement of said second bolt to block retraction thereof and to block pro-- jection'of said first bolt by at least one of said plurality of keys, and releasing means for said controlled by the aforesaid certo the projection of said first bolt by said certain of said keys.

15. In a lock, a dead bolt, means con-I trolled by one of a plurality of keys and operable from one side of the lock for projecting and retractin said bolt, a second dead bolt manually operable from the opposite side of the lock, means of connection etween said bolts whereby the projection of the first bolt by another'of said plurality of keys operates to retract said second bolt when previously projected, means controlled by one of said plurality of keys other than said firstmentioned key for projecting said first bolt and for blocking its subsequent retraction through said first named key, and means controlled by a further and certain key of said plurality of keys for projecting said first bolt and for blocking its subsequent retraction through any other of said plurality of keys.

16. In a look, a dead bolt, means conof the lock for pro ecting and trolled by one of a plurality of keys and operable from one side of the lock forprojecting and retracting said bolt, a second. dead bolt manually operable from the opposite side of the lock, means of connection between said bolts whereby the projection of the first bolt by another of said plurality of keys operates to retract said second bolt when previously projected, and whereby projection of said second bolt operates to retract said first bolt when previously projected through said first named key, means controlled by one of said plurality of keys other than said first mentioned key for projecting said first bolt and for blocking its subsequent retraction through sai first named key, and means controlled by a further and certain key of said plurality of keys for projecting said first bolt and for blocking its subsequent retraction through any other of said plurality of keys.

17. In a lock, a dead bolt, means controlled by one of a plurality of keys and operable from one side of the lock for projecting and retracting said bolt, a second dead bolt manually operable from the opposite side of the lock, 1 leans of connection between said bolts whereby the projection of the first bolt by another of said plurality of keys operates to retract said second bolt when previously projected, means controlled by one oi said plurality of keys other than said first mentioned key for projecting said first bolt and for. blocking its subsequent retraction through said first named key, and means controlled by a further and certain ke of said luralit ofke s for retractin said first bolt when projected through said first and second mentioned keys and for projecting said first bolt and for blocking its subsequent retraction through any other of said plurality of keys.

18. In a look, a dead bolt, means controlled by one of a plurality of keys and operable from one side of the lock for projecting and retracting said bolt, a second dead bolt manually operable from the opposite side of the lock, means of connection between said bolts whereby the projection of the first bolt by another of said plurality of keys operates to retract said second bolt when previously projected, and whereby projection of said second bolt retracts said first bolt when previously projected by at least one of said plurality of keys, means controlled by one of said plurality of keys other than said first mentioned key for projecting said first bolt and for blocking its subsequent retraction through said first named key, and means controlled by a further and certain key for projecting said first bolt and for blocking its subsequent retraction through any other of said plurality of lgeys, and by the projection of said second first mentioned 19. In a look, a dead bolt, means controlled by one of a plurality of keys and operable from one side of the lock for projecting and retracting said bolt, a second dead bolt manually operable from the opposite side of the lock, means of connection between said bolts whereby the projection of the first bolt'by another of said plurality of keys opcrates to retract said second bolt when previously projected, and whereby projection of said second bolt operates to retract said first bolt when previously projected through said first named key, means controlled by one of said plurality of keys otherthan said first mentioned key for projecting said first bolt and for blocking its subsequent retraction through said first named key, and means controlled by a further and certain key for projecting said first boltand for blocking its subsequent retraction through any other of said plurality of keys and through the projection of said second bolt.

20. In a lock, adead bolt, means controlled by one of a plurality of keys and operable from one side of the lock for projecting and retracting said belt, a second dead bolt manually operable from the opposite side of the lock, means of connection between said bolts whereby the projection of the first bolt by another of plurality or" keys operates to retract said second bolt when previously projected, and whereby the projection of said second bolt operates to retract said first bolt when previously projected by at least one of said plurality of keys, means controlled by one of said plurality of keys other than said key for projecting said first bolt and for blocking its subsequent retracti on through said first named key, and means controlled by a further and certain key for retracting said first bolt when projected through said'first and second mentioned keys and for projecting said first bolt and for blocking its subsequent retraction through any other of said plurality of keys, and through the projection of said second bolt.

21. In a lock, a dead bolt, tumbler mechanism therefor, means controlled by one of at least three difierent keys for operating said tumbler mechanism to project and retract said dead bolt, means controlled by another of said three keys for so operating said bolt and for blocking the retraction of said bolt through said first key, with movable bolt-blocking means independent of said belt and tumbler mechanism, and with means controlled by the third of said keys for operating said tumbler mechanism to project and retract said bolt and for operating said blocking means, upon bolt projecting movement,,to move the same to block retraction of said bolt through said first and second keys.

22. In a lock, a dead bolt, tumbler mechanism therefor, means controlled by one of move the same to block retraction of said bolt through said first and second keys.

23. In a look, a dead bolt, tumbler mechanismtherefor, meanscontrolled at least three difierent'keys for projecting and retracting said bolt and including key-controlled tumbler operating means, movable bolt blocking means separate from said bolt and tumbler mechanism and moved through one certain of said different keys upon projection ofsaid bolt, to block retraction of said bolt through any of the other of said keys. p 7

24. In a look, a dead bolt, tumbler mechanism therefor, means controlled by at least three different keys for projecting and retracting said bolt and including key-controlled tumbler operating means, movable bolt blocking means separate from said bolt and tumbler mechanism and movable through said tumbler mechanism, when operated by a certain key only of said different keys, to block subsequent retraction of said bolt by any of the other of said keys.

; In a look, a dead bolt, tumbler mechaat least three keys of different relative nism therefor, means controlled by at least three different keys for operating said tumbler mechanism and projecting and retracting said bolt, said keys being of different relative lengths and said key-controlled means including tumbler operating means having a different operative position for each of said keys, bolt blocking means separate from the bolt and tumbler mechanism and normally moving with said bolt but movable relatively thereto through said tumbler mechanism, upon bolt projection and tumbler actuation by a certain key only of said different keys, into and out of position to' block subsequent retraction of said bolt through any other of said keys.

26. In a look, a dead bolt, tumbler mechanism therefor, means controlled by at least three difierent keys for operating said tumbler mechanism and pro ecting and retracting saidbolt, said keysbeing of different' relative lengths and said key-controlled means including tumbler operating means,

having a different operative position for each of said keys and different degrees'of tumbler movement, bolt blocking means separate from the bolt and tumbler mecha nism and normally moving with said bolt but movable relatively thereto through sa d 7 tumbler mechanism, upon bolt projection and tumbler actuation by a certain key only of said different keys, into and out of position to block subsequent retraction of said bolt through any other of said keys. p

f NORMAN BIHU'RD. V Witnesses: V

-' R, S. GOLD,

W. L. VVILLIAMs.

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

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