US1253051A - Recording-lock. - Google Patents

Description

A. KNISTROM.

RECORDING LOCK- APPLICATION FILED NOV. 11, m5;

Patented Jan. 8, 1918.

8 SHEETS-SHEET 1.

INVENTOR 4. mm

A TTOR/VEKS A. KNISTROM.

RECORDING LOCK.

APPLICATION msn NOV. n. 1915.

1 ,25 3,05 1 Patented Jan. 8, 1918.

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ATTORNEYS.

A. KNISTROM.

RECORDING LOCK.

APPLICATION FILED NOV. 11, 1915.

1,253,051. Patented Jan. 8,1918.

8 sHEETs-sHEETQ.

53 4'32; ii XV l/VVE/VTUR l 74 7 By M I ATTOH/VEYJ A. KNISTROM.

RECORDING LOCK.

APPLICATION FILED NOV. 11. 1915.

Patented Jan. 8,1918.

8 SHEETS-SHEET 4- INI/f/VTOR 2-,. a mud ATTORNEYS A. KNISTROM.

RECORDING LOCK.

APPLICATION FILED Nov.1l. 1915.

1,253,051. Patented Jan. 8,1918.

8 SHEETS-SHEET 5.

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RECORDING L QCK. APPLICATION min NOV. 1!. 1915.

1,253,051. Patented Jan. 8,1918.

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INVE/V TOR A. KNISTROM.

RECORDING LOCK.

8 SHEETS-SHEET 8.

v U 71 In. 1 a 80 ATTORNEYS UNITED sTATEs PATENT OFFICE.

AUGUST KNISTROM, F BINGHAMTON, NEW YORK, ASSIGNOR T0 INTERNATIONAL TIME RECORDING COMPANY OF NEW YORK, OF ENDICOTT, NEW YORK, A CORPORATION OF NEW YORK.

RECORDING-LOCK.

Specification of Letters Patent.

Application filed November 11, 1915. Serial No. 60,874.

To all whom it may concern:

Be it known that I, AUGUST KNIsTRoM, a.

' Locks, of which the following is a full, clear,

and exact description.

This invention relates to locks for doors, particularly for doors forv shops, oflices, storerooms, etc., and its chief object is to provide a lock and recording mechanism associated therewith which will, when the door is unlocked, record the number or other character appropriated to the particular key used (thereby identifying the person that unlocked the door), and. will also record the time at which the door was unlocked. Another object is-to provide a lock that can be used as one of a plurality of locks to control a common recording mechanism, thereby obviating the necessity of having independent time-printing devices for each lock. A further object is to provide a lock for the purpose indicated, which canbe opened by a invention is capable without departure from its spirit I have selected for illustration and specific description herein. the one which at the present time is considered to exhibit the invention in its most convenient and effective form. This embodiment is shown in the accompanying drawings, in which- Figure 1 is a rear view of the lock in place on the door, part of the door being broken away to show the lock.

Fig. '2 is an edge view of the lock, showing the key (of the well known Yale type) inserted. V

Fig. 3 is a rear view of the electrical con tact mechanism of the lock.

Fig. 4 is a rear view of the bolt-actuating inechanism and the contacts actuated there- Fig. 5 is a vertical section, about through the barrel of the lock, and at right angles to the plane of Fig. 3.

Fig. 6 is an edge or sideview of the inner mechanism of the lock viewed from the right of Fig. 1, the casing of the lock being in section. v i

Fig. 6 is a detail 'view illustrating the function of certain parts provided to prevent pushing the bolt inwardly by a knife or other sharp-pointed tool after the bolt has Eeen retracted part way by means of the Fig. 7 is a top plan view and'Fig. 8 is a bottom plan view with the lock casing in section and with certain parts of the vlock mechanismomitted to show the remaining parts more clearly. t

Fig. 9 is a detail sectional view.

Fig. 10 is a detail section of co on line 10 of Fig. 3.

Fig. 11 (on the same sheet as Fig. 5) is a rear view, on a larger scale, of the brake-fan mechanism provided to prevent too rapid actuation of the look by the key.

Figs. 12 and 13 (on the same sheet as Fig. 1) are side and bottom plan views of one of the electrical contact devices.

Figs. 14 and 15 show two types of records that can be produced by the lock.-

Figs. 16 and 17 show printing devices adapted to print the records illustrated in Figs. 14 and 15 respectively.

Fig. 18 is a diagram showing the wiring of the system and showing the recording mechanism in skeleton form. r

The lock illustrated is set in a mortise in the edge of the door 10 and is of the well known Yale type,having a rotary barrel 11, Fig. 5, actuated by a fiat key 12 formed with notches or teeth in its edge. The sliding tumblers or pins 13 are divided, part of each being mounted in the stationary member 14: and part in the barrel 11. When the proper key'is inserted in the barrel the pins are lifted until their several planes of division are in line at the surface of the barrel, and the latter can then be rotated. But if the wrong key is inserted, one or more pins are lifted too far or not far enough and the barrel cannot be turned. This type of lock is so widely used and so well under- Patented J an. 8, 1918.

stood that further explanation is unnecessary. Nor is it the only type to which myed well beyond the bearing member 14, as

shown in Fig. 5, to provide for the actuation of mechanism hereafter described, and is connected by an operating finger 15 to a train of gears 16, driving a brake-fan 17 which is thus rotated at high velocity when the barrel is turned, thereby putting a drag on the barrel which compels the operator to turn it at moderate and substantially uniform speed.

The rearward or inward extension of the barrel, shown at 18 in Figs. 3 and 5, is fiattened, and carries two radially movable pins 19, 20, to cooperate with the end of the key 12 in the same manner as do the pins or tumblers 13; that is, when the key is inserted the pins 19, 20 are shifted radially, each to an extent depending upon the configuration of the cooperating edge of the key.

The barrel 11 also carries at its rear a toothed disk, or gear, 21, serving as a ratchet (for the purpose explained below) and on the disk are two pivoted dogs 22, 23, Fig. 3, having lower or inner arms held in contact with'the respective pins 19, 20, by means of coil springs 24, 25, and having upper or outer arms provided with antifriction rollers. In the vertical planes in which these dogs revolve as the barrel rotates are two series of contact-devices, as 0,, b, 0, cl, 6, consisting of two pivoted arms 26, 27, held yieldingly apart and against stops 28, 29, by light coil springs 30. Evidently, pressure radially, outward against an arm 27 will cause it and the cooperating arm 26 to come together. Moreover, the two will rub together slightly, since their pivots are at different distances from their contact-faces, thus keeping the latter clean and bright. The proportion and arrangement of the parts are such that the inner arms, 27, are

successively closer to the axis around which the dogs 22, 23, revolve. The result is that if a dog (23, for example) is shifted only slightly by the pin 19 when the key is inserted it will, as it revolves, pass inside of the arms 22 of all the pairs of contacts except the last one, 6, and hence will send only one current impulse over the circuit in which the contacts a, b, 0, d and e are connected. If the dog is held farther out by its pin it will close contacts d also. If still farther, it will close contacts 0, d and e, and so on. If not shifted at all it will not close any of the contacts. It will therefore be seen that with five pairs of contacts six different conditions can be produced in the circuit, namely, no impulse, one impulse, two impulses, three impulses, etc. As already stated, there are (in the present embodiment of the invention) two series of contacts.

The second series is concealed behind the first in Fig. 3, but two of its sets of contacts are shown at c, e, in Fig. 6. This second series gives six conditions in its circuit. Hence, .by permutating these twelve conditions in combinations of two it is possible to get thirty-six distinct conditions for the control of the recording mechanism. ()ne of the contact arms 27 is shown in detail in Figs. 12 and 13, on the same sheet as Fig. 4. The contact-face 31 is dovetailed to, but insulated from, the arm, and can be readily removed for repair or renewal. It is electrically connected .to the binding post 32 which is mounted on and insulated from the rest of the arm. In these respects the arms 26 are exactly similar, but of course they lack the curved edge-portions 33 for engagement with the actuating dogs 22, 23.

To compel the operator to complete the movement of the barrel once the movement is begun, I provide a full-stroke pawl,

. Figs. 3 and 10, pivoted at 34 on the plate 35, on which the contacts a, b, 0, etc., are also pivoted. This pawl consists of two parts, 36, 37, rigidly connected by an alining pin 38 and fixed to a small piece 39 on the back of plate 35, the pin 38 working in a slot 40. The part 37 has two divergent fingers, shown clearly in Fig. 3, to coiiperate with the teeth on the ratchet disk 21, while the part 36 is pointed to cooperate with a stud 41 on the said disk. The piece 39 is pointed at its outer end (see Fig. 4) to coiiperate with the pointed end of a pivoted arm 42 actuated by a coil spring 43. With the parts in the position shown in Fig. 4 itis clear that the two-fingered member of the pawl will be held in the position shown in Fig. 3, permitting the disk 21 and barrel 11 to turn freely in the direction of the arrow but not in the opposite direction. As the disk completes its revolution the stud 41 throws the pawl over, bringing the finger 39 on the other side of the pointed end of arm 42, so that the disk 21 can be turned only in the backward direction. In other words, the operator cannot go part way in the looking or the unlocking direction and then go back.

The sliding bolt 44, Fig. 4, is actuated in both directions by a three-armed lever 45, fulcrumed at 46 and having its center arm forked for connection with the stud 47 on the bolt. To the ends of the other arms two hooked members 48, 49, are pivoted. The latter are drawn toward each other by a spring 50, their hooked upper ends being thusheld in operative position with respect to the lug 51 on the barrel 11. As the barrel rotates in the direction of the arrow the lug simply swings the member 49 outwardly idly, extending the spring 50, but as it nears the end of its movement the lug engages the member 48 and lifts the same, thereby rocking lever 45 and retracting the bolt. As the member 48 is lifted its edge 146 (see also Fig. 6) strikes the stud 145 on the springactuated arm 52, pivoted at 53, and is held thereby in engagement with the lug 51, the spring 50 causing the head of the link to follow the lug and pass the stud as the lug continues its movement. \Vhen the barrel is turned backwardly to lock the door, the lug 51 passes member 48, idly camming the latter out against stud 145, and at the proper...

time the lug engages and lifts the member 49, thereby rocking lever 45 clockwise and advancing the bolt.

Above the barrel'll is an arm 54, pivoted at 55. On the free end of the arm are two crossed dogs 56, 57, (Figs. 4 and 18) pivoted on the same pivot 58, and having flat feet 59, 60 on opposite sides of the lug 51 and extending below the top of the latter. A light coil spring 61, having its ends fitted into the tops of the dogs, tends to bring their feet together. Stops 62, 63, the latter on the arm 54, limit the separation of the dogs. As the lock barrel rotates in the direction of the arrow in Fig. 4 (the unlocking direction) the two dogs swing idly toward the left, but while the lug 51 is lifting the member 48 to retract the bolt 44 the lug meets the foot 59 and lifts the dogs, the arm 54 swinging up on'its pivot 55. The lug also swings the dogs toward the left, but before they have swung far in that direction the stop 62 is encountered and dog 59 is thereby compelled to swing the other way, that is, toward the right. Stop 63 is also encountered, and dog 60 is thereby compelled to swing toward the left. The result is that as the two dogs reach the limit of their upward movement they are separated far enough to receive the lug 51 between them. Bearing on the head of pivot 58 is a lever 64, fulcrumed at 65 and forming part of a pair of contacts f, the latter being in other respects similar to contacts a, 1), etc..

Hence, as the two dogs are raised by lug 51 the contacts f are closed (thereby closing a printing circuit hereafter described); and as the lug comes under the opening between the dogs the spring 65 opens the contacts and, by rocking lever 64 clockwise, swings the arm 54 down and restores the dogs to the position shown in Fig. 4. Thus the printing circuit is closed at the end of the unlocking movement of the lock barrel; and it will be seen that the circuit is also closed in a similar manner, at the end of the locking movement of the barrel.

Several precautionary features are provided to prevent improper operation of the lock. For instance. a pivoted stop or pawl 140. raised by a spring 141. Fig. 3, is provided to engage the rear of the bolt-head 142. thereby preventing retraction of the bolt by working with a knife. or other thin sharpminted instrument inserted between the jamb or door-frame and the edge of the door. The stud 143, to which the pawlactuating spring 141 is connected, bears normally against an inclined cam-finger 144 projecting laterally from the link 48, Fig. 4. When the lug 51, revolving in the direction of the arrow, strikes the link 48 the latter is swung toward the right, thereby cam ming the pawl 140 down below the bolthead 142 and holding the pawl there until the lug has lifted link 48 far enough to retract the bolt beyond the nose of the pawl. so that when the link is raised out of contact with the stud 143 the spring 141 will simply swing the pawl idly up against the bottom edge of the bolt. When the lug 51 has lifted the link far enough to release the pawl from the bolt the operator may leave the barrel 11 in such position and try to complete the retraction of the bolt by means of a knife inserted in the crack of the door, so as to open the door without turning the key far enough to make a record. At that time, however, (see Fig. 6 the lug 51 prevents any leftward swing of the link 48, and the stud 145 on arm 52, engaged by edge 146 of the link, prevents vertical movement of the link; and since pushing the bolt inward involves raising the link, it will be seen that the bolt cannot be pushed in unless the barrel 11 is turned (by the key) thereby permitting the link to swing toward the leftso as to pass the stud 145. But turning the barrel in this manner, far enough to let the bolt come in, raises the dogs 59, 60, and hence causes the record to be printed as already described.

The precise nature of the recording mechanism to be used with the lock is immaterial, save that it should admit of accurate and reliable control by the circuits referred to,

which are closed and opened by the contacts a, b, c, d, e, d, e, In Fig. 16 I have shown diagrammatically a portion of a recorder having time-printing wheels 66, 67 driven by a clock .68 in any convenient manner, and having two type whels 68, 69, to print a letter or other character identifying the lock and another character, as a number, to identify the key used. In such case all the keys'for a given lock are so figured on the notched edge that each will close the same number of one series of contacts, so that the printing wheel 68 will be turned to the same position when any of the keys is used; but that portion of the edge that affects the other series of contacts is different for each key.

so that the position of the type-wheel 69 I depends upon the particular key used. Vith such a recorder, provided with suitable feeding devices to feed the paper record-strip past the printing mechanism, the printed record will be of the kind shown in Fig. 14. In this figure it is seen that lock (or door) A was opened by key No. 6 at 6:45; door B by key No. 3 at 7 :22, etc. With a recorder of the type indicated by Fig. 16 the number of keys that can be recorded is limited to the number of pairs of contacts in the key series; that is, the series controlled by the key. Inasmuch as the number of ,pairs of contacts is limited by the space available I prefer to put key-numbers on both wheels, as on the wheels 70, 71, Fig. 17, and put the doorletter, for example A, on wheel 70 alongside of each number thereon. Then by shaping the keys to position wheel 70 differently, as well as wheel 71, any number of keys from one to thirty-six can be recorded, and beside each key number printed, on the record strip will be printed the letter corresponding to the door. 7

To permit two or more locks to be operated simultaneously without confusing the imprints, each lock canbe provided with its own hair of printing wheels, the several pairs of wheels being arranged side by side so as to space the several door-and-key imprints laterally from each other. A recorder of this type is indicated in Fig. 17, in which five pairs of Wheels are shown, four besides the wheels 70, 71. The time-printing wheels are indicated at 72, 73. A record made by'such a recorder is shown in Fig. 15, in which it appears that doors A and D are opened at 6 32 by keys 5 and 2 respectively, that as 6:55 door A was locked by key 12 and door B opened by key 31. It is clear that in a recorder of the type indicated in Fig. 17, each pair of lock-and-key printingv wheels must have its own actuating or positioning mechanism.

Fig. 18 shows the wiring of the system and also illustrates diagrammatically a convenient recorder. with type-wheel-positioning mechanism for one lock. As shown, the contacts a, b, 0, cl, e are in circuit with magnet 74, (in multiple with each other and in series with the magnet), through wires 76, 77, a source of current 78, and bus-barsv 7 9, 80. When a pair of contacts is closed an impulse is sent over the circuit, magnet 74, is energized, and armature 81 is drawn up, thereby causing pawl 82, carried on the arm 83 which is rigidly connected-with the armature, to advance through a space of one step the ratchet 84 and type-wheel which is fixed to the ratchet. Hence a key that closes only one pair'of contacts will advance the type wheel one step; one that closes two pairs of contacts advances the wheel two steps; etc. In like manner the type-wheel 71 is positioned by magnet 85, through the agency of wires 86, 87 battery 88,bus- bars 89, 90, and contacts a, Z), 0', cl, 6. Backward movement of the type-wheels is prevented by small holding pawls 91.

When the printing circuit is closed at contacts f, current flows from battery 92 through wire 93, relay magnet 94, wire 95,

contacts f, and wire 96 back to the battery. Being thus energized, magnet 94 raises its armature 97 into engagement with contacts 98, 99, closing a circuit from battery 100 through wire 101, contact 99, armature 97, wire 102, pivoted contact lever 103, armature 104, magnet 105, and wire 106 back to the battery 100. Magnet 105, thus energized, draws down its armature 104, thereby actuating pawl 107, which rotates the ratchet 108 and shaft 109 one step. Contact disk 110, on said shaft, is also advanced, carrying its insulated portion 111 out from under contact 112, thereby laying a shunt across contacts I, so that current now flows from battery 92 through wire 93, relay magnet 94, wire 113, contact 112, disk 110, wire 114, armature 97 contact 98, and wire 115 back to the battery, so that magnet 94 is kept energized, and its armature 97 held against contacts 98, 99, even after the printing circuit is broken at contacts f. In the meantime, as armature 104 was drawn down, the

viously traced through the ma net. By this time the first circuit through the magnet 94 has already been broken at the contacts f, so

that the armature 97 'falls and opens the vibrating circuit through magnet 105. Mounted on the shaft 109 and rotated thereby is a cam 118, which cooperates with the printing lever 119 and raises the printing head 120 against the tension of the spring 121. As the insulated spot 11.1 on disk 110 comes under contact 112 the drop in the cam reaches the printing lever, whereupon the latter is thrown down by its spring, striking the.

record strip 122 against the printing wheels indicated at 123. (The usual ink-ribbon is not shown.) As the printing hammer is rocked by the cam the link 124, actuated by the hammer, advances the pawl 125, thereby turning the feed-roller 126 and feeding the record stripforward' one step; and as the hammer falls the pawl is retracted. Of course it will be understood that the printing wheels 70, 71, are, in practice, alongside of the wheels 123 and under the hammer. The lever 119 carries a hooked pawl 127, urged counterclockwise by a'spring 128 but initially held by a stop 129. As the lever is rocked by the cam the pawl is drawn into engagement with the hooked upper end of the vertically sliding link 130, connected at its lower end through the medium of a bell- Y link 130 and restoring the holding pawls 91' crank lever 131 to a link 132, so that when the printing hammer is actuated by its spring the link 132 will be advanced (toward the left in the figure) thereby disengaging the holding pawls 91 from their ratchets and hence allowing the springs 133 to restore the printing wheels to initial position. To give the, link 132 enough lost motion to permit the printing to take place before the holding pawls are disengaged its connection with the latter is made by means of slots 134. cooperating with pins on the pawls. As the pawl 127 approaches its upper or initial position during the printing stroke of the hammer 119, the stop 129 causes the pawl to rock out of engagement with the link130. after which the spring 135 rocks thebellf-crank 131, drawing down to engagement with their ratchets.

It will be observed that the actuation of contacts f. and hence the closing of the printing circuit, is independent of the nature of the key used but is effected whenever the barrel 11 is turned far enough to advance or retract the bolt of the lock. Consequently if the operator should mutilate the end of the key. with the idea of preventing the look from recording, he may prevent the number of the key from being printed but should he unlock the door the time at which the lock was operated will nevertheless be printed. If a time-record without a key-number is found on the record-sheet, all the keys can be called in for inspection: whereupon it is evident that the mutilated key (or the missing key) was the one that v. as used to unlock the door.

The recording apparatus is not claimed herein, except broadlv as an element in combination with the lock. Of course the recording mechanism is not mounted on the door. but is located at any suitable point more or less remote, and is connected to the lock or locks by the wires 76, 77, 86, 87,

It is to be understood that the invention is not limited to the construction herein specifically described but can be embodied in other forms without departure from its proper spirit.

I claim:

1. The combination with a lock having a key-actuated rotary member; of recording mechanism to print key-identifying characters; a controlling circuit therefor; a plurality of movable contacts in multiple in said circuit and arranged adjacent to the rotary member of the lock; and keypositioned means to actuate one or more of said contacts as the rotary member turns, whereby one or more current impulses, according to the key used. may be sent over the circuit to control the recording mechanism.

2. The combination with a lock having a key-actuated rotary member, and bolt-operating means actuated by the rotary member; of recording mechanism to print keyidentitying characters; a controlling circuit therefor: a series of movable contacts in multiple in said circuit and adjacent to the rotary member: kev-positioned means to actuate one or more of the contacts as the rotary member turns, whereby one or more current impulses, according to the key used, may be sent over the circuit to control the recording mechanism; printing circuit for the recording mechanism; printing contacts in the printing circuit; and mechanism actuated by the bolt-operating means to actuate the printing contacts as the rotary member approaches the limit of its turning movement.

3. The combination with a lock having a key-actuated rotary member; of a plurality of pairs of contacts surrounding the rotary member at different distances therefrom; and key-positioned means carried by the rotary member to close one or more of said pairs of contacts as the member rotates.

4. The combination with a lock having a key-actuated rotary member; of a plurality of contacts surrounding said member at different distances therefrom; and means, including radially adjustable key-positioned devices, carried by the rotary member to actuate one or more of the contacts as said member rotates.

5. The combination with a lock having a key-actuated rotary member; of a plurality of pairs of pivotally mounted contacts surrounding the rotary member; springs connecting the contacts of each pair to hold the same normally apart and to cause the outer contact to swing toward the inner when the latter is swung outwardly; and key-positioned means carried by the rotary member to actuate one or more of the inner contacts when the rotary member is turned.

6. The combination with a lock having a key-actuated rotary member; of a plurality of movable contacts surrounding the rotary member; and means, including a radially adjustable key-positioned pin, to engage and actuate one or more of said contacts as the rotary member is turned.

7. The combination with a lock having a key-actuated. rotary member; of a plurality of movable contacts surrounding the rotary member at different distances therefrom; an outwardly adjustable dog carried by the rotary member and a pin carried by the rotary member and shiftable outwardly by the key to adjust the dog whereby the latter will en-v gage and actuate one or more of the contacts as the rotary member turns, according to the key used.

8. The combination with a lock having a key-actuated rotary member; of a plurality of movable contacts surrounding the rotary member; key-positioned means carried by the rotary member to engage and actuate one or more of the contacts as the said member turns; and meanspermitting rotation of said member in but one direction until its movement in such direction is completed.

9 The cmnbination with a lock having a key-actuated rotary member. of a plurality of movable contacts surrounding the rotary .member;key-positioned means carried by the rotary member to actuate one or more of the. contacts as the said member rotates; a toothed disk connected with and rotated by said member; a double-pointed pawl cooperating with the disk to permit rotation of the same and said member in one direction only; and means acting to reverse the pawl as the rotary member completes its movement in the permitted direction. whereby said member may then be rotated in the other direc tion.

10. The combination with a lock having a key-act uatcd rotary member and an inwardly and outwardly movable bolt; of a lug carried by and revolving with the rotary member; means actuated by said lug to shift the bolt in and out according to the direction of rotation of said member; a printing circuit having a movable contact; and means actuatedby said lug to actuate said contact and thereby close the circuit thereof at the completion of the rotary movement of the said member in either direction.

11. The combination with a lock havin a key actuated rotary member positioned with an outwardly extending lug; of a dog eX- tending on one side of the lug and shiftable outwardly thereby as the rotary member is turned in one direction; a dog extending on the opposite side of the lug and shift-able outwardly thereby as the rotary memberis turned in the other direction; and a movable contact arranged for actuation by the outward movement of either of said dogs.

12. The combination of a lock having a key-actuated rotary member positioned with an upwardly extending lug; an arm pivoted at one end above the lug; a pair of divergent dogs pivoted together and .to the pivoted arm. depending therefrom and embracing the lug; a pair of normally separated contacts; and a device connected with the contacts to close the same and arranged for actuation by movement of either of said pair of dogs as the lug revolves with the rotary member.

13. The combination of a lock having a key-actuated rotary member provided with a radial lug; a bolt; a hooked link connected with the bolt to retract the same and arranged to be engaged and actuated by said lug as the rotary member completes its movement; a stop to cooperate with said link to prevent complete actuation thereof and retraction of the bolt except by the complete movement of said rotary member; and recording means associated with said member for operation whenever the latter is turned to retract the bolt.

14;. The combination of a lock having a key-actuated rotary member provided with a radial lug: abolt; a hooked link connected with the bolt and in position to be first rocked and then engaged and shifted by the said lug to retract the bolt; and a stop normally engaging the bolt to prevent retraction thereof but shiftable out of engagement with the bolt by the rocking movement of the link.

In'test-imony whereof I atfix my signature.

AUGUST KN ISTROM.

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