US3348220A - Selectively signalling device for pin-tumbler lock - Google Patents

Description

Oct. 17, 1967 T.J. LUNA ETAL SELECTIVELY STLGNALLING DEVICE FOR PIN-TUMBLER LOCK Filed Dec. 21. 1964 4 Sheets-Shet 1 INVENTORS.

A F44 L /C'K No/eMA/v 0,0424 5.: 40m: JON/44D 4E6 FALL/CA TON Y J. L UN SEYMOUR J SELECTIVELY SIGNALLING DEVICE FOR PIN-TUMBLER LOCK Filed Dec. 21. 1964 I 1*..1. LUNA E AL 4 Sheets-Sheet 5 I NVENTORJ'.

4 m I 5 N z 2 fig m w f r A 4 c4 .2 r wm 6% MUM/M TSND 0d, 17, 1957 'r. J. LUNA ETAL SELECTIVELY SIGNALLING DEVICE FOR PIN-TUMBLER LOCK Filed Dec. 21. 1964 4 Sheets-Sheet 4 TONY SFYMOUIQ JO/Vflp LEE FALL United States Patent Filed Dec. 21, 1%4, set. No. 419,783 4 Claims. or. 340-274 This invention provides for selective operation of a lock to give it controlled action or to activate an alarm when the lock is opened by an unauthorized person.

According to the arrangement of this invention, a pintumbler lock can be made to rotate only in one direction by one key, while being permitted to turn solely in a different direction by another key. Also, the lock may be constructed to rotate through different arcs, depending upon which key is utilized. This lock arrangement may be incorporated in an alarm system Where rotation of the lock in one direction is made to actuate the alarm, while turning it in the other will give normal operation. In another version, one key will permit 360 rotation of the lock so that an automatic spring latch can be neutralized. A second key can turn the lock only through an arc of less than 360 so that the spring latch cannot be neutralized. Beyond these examples, there are many variations possible in the types of selective lock operation permitted by this invention. In accomplishing these results, the lock is provided with stop members extending through the cylinder to the vicinity of the core, and the keys are given notches in predetermined locations. A key appropriately notched will clear one or more of the stop elements, while one with a notch in a diiIerent location or without a notch will be prevented from turning by a stop.

An object of this invention is to provide for the selec-' tive operation of a lock.

Another object of this invention is to provide an alarm system for locks.

A further object of this invention is to provide a lock that can be turned in different ways through the use of difierent keys.

An additional object of this invention is to provide a selectively operable lock of dependable operation, yet of economical manufacture requiring minimum modification of existing lock construction.

These and other objects will become apparent from the following detailed description taken in connection with the accompanying drawing in which:

FIGURE 1 is a longitudinal sectional view of a pintumbler lock embodying the invention;

FIGURE 2 is an elevational view of the keys for use in the lock of FIGURE 1;

FIGURE 3 is a transverse sectional view taken along line 3-3 of FIGURE 1, showing the relationship of one of the keys and the stops;

FIGURE 4 is a transverse sectional view taken along line 44 of FIGURE 1, further illustrating the key and stop arrangement;

FIGURE 5 is a plan view of the lock of FIGURE 1, showing the position of the cam and switch for activating an alarm or the like;

3,348,220 Patented Oct. 17, 1967 FIGURE 6 is a transverse sectional view taken along line 6-6 of FIGURE 5;

FIGURE 7 is a wiring diagram of the alarm system activated by selective rotation of the lock;

FIGURE 8 is a plan view of a lock with a different cam arrangement for tripping the switch of the alarm system;

FIGURE 9 is a transverse sectional view taken along line 9-9 of FIGURE 8, illustrating the details of the cam and switch mounting;

FIGURE 10 is a side elevational view showing the invention as applied to a bolt;

FIGURE 11 is an enlarged fragmentary longitudinal sectional view taken along line 11-11 of FIGURE 10, illustrating the arrangement for tripping the switch by movement of the bolt;

FIGURE 12 is a plan view of a lock arrangement of the lazy cam type incorporating the principles of this invention;

FIGURES 13, 14 and 15 are'end elevational views of the lock of FIGURE 12 with the lazy cam in different rotational positions;

FIGURE 16 is a transverse sectional view of a modi- I fication in which the selective operation of the lock is accomplished by a groove and a pin and driver set of the lock;

FIGURE 17 is a transverse sectional view of the lock of FIGURE 16 taken at a different axial position of the lock;

FIGURE 18 is a transverse sectional view of a lock using a different type of stop and constructed to allow rotation of 360 by one key and of a lesser are by a second key shown positioned in the lock;

FIGURE 19 is a transverse sectional view of the lock of FIGURE 18 with the key for full rotation inserted; and

FIGURE 20 is an elevational view of the keys used with the lock of FIGURES 18 and 19;

FIGURE 21 is a side elevational view of a maximum security type lock utilizing the invention;

FIGURE 22 is an end elevational view of the lock of FIGURE 21;

FIGURE 23 is a sectional view of the lock taken along line 23*23 of FIGURE 22;

FIGURE 24 is an enlarged fragmentary view of thesystem;

FIGURE 25 is a view similar to FIGURE 24 with the cam in a different position; and

FIGURE 26 is a wiring diagram of an alarm system used in connection with the lock arrangement of FIG- URES 21 through 25.

With reference to the drawing, there is seen in FIG- URES 1, 2, 3 and 4 a pin-tumbler lock including a cylinder 20 within which is rotatable the core 21 having a broached hole 22 to receive a key 23. The cylinder and core cooperate to retain pins 24 and drivers 25, biased inwardly toward the opening 22 by means of compression springs 26. In the usual manner, the proper key for the lock will elevate the pins 24 to a point where the juncture between the pins and the drivers lies at the shear line 27 between the core and cylinder. This is the position shown in FIGURE 1. When this is done, the core can be rotated within the cylinder so that the tail piece 28 actuates an associated latch mechanism, not shown.

According to the arrangement of this invention, the core 21 is provided with a pair of axially spaced circumferential grooves 29 and 30 in its periphery. Within these grooves are arcuate pieces 31 and 32 that have a radial dimension substantially the full depth of the grooves. The arcuate members 31 and 32 extend for less than 360 and do not interfere with the key opening 22 when the core is centered relativeto the cylinder prior to actuating the lock. The arcuate members 31 and 32 include outwardly extending tabs 33 and 34. These project into axially extending slots 35 and 36, respectively, formed in the inner circumferential wall of the cylinder 20. This positions the arcuate members 31 and 32 so that they cannot rotate relative to the cylinder. The arcuate members 31 and 32 are located by this arrangement so that they present end surfaces on either side of the key opening 22. In other words, the end wall 37 of the members 31 is on the left side of the opening 22 in the sectional View of FIGURE 3, while the end wall 38 of the arcuate members 32 is on the right-hand side of this opening.

Two keys are provided for the operation of this lock. Both the key 23 and the accompanying key 40 have the same pattern on their edges 41 and 42 that engage the pins 24. Consequently, either of these keys will raise the pins to the shear line 27 of the lock so that the core may be turned relative to the cylinder.

The opposite edge 43 of the key 23 is provided with a notch 44. Similarly, the edge 45 of the key 40 has a notch 46. The notch 44 is spaced farther from the shoulder 47 of the key 23 than is the spacing of the notch 46 from the corresponding shoulder 48 of the key 40. The notch 44 is positioned so that, when the key 23 is inserted into the broached hole 22 so that the shoulder 47 engages the end of the core 21, the notch 44.is in registry with the arcuate member 32. This may be seen by reference to FIGURES l and 3. When the key 40 is fully inserted in the lock, on the other hand, its notch 46 becomes aligned with the other arcuate member 31. This results in the selective operation of the lock.

It can be seen that when the key 23 is fitted into the lock it can be turned in only one direction. This is because the arcuate member 31 acts as a stop and prevents it from rotating in the opposite direction. Thus, as seen in FIGURE 4, it is impossible to turn the key clockwise because the side of the key will strike the end edge 37 of the arcuate member 31. However, the notch 44 registers with the other arcuate member 32. Consequently, rotation of the key in the counterclockwise direction is permitted. As this movement occurs, the core rotates relative to the cylinder in the usual manner, and the arcuate members 31 and 32 slide within the annular grooves 29 and 30 as the core turns.

While the key 23 provides for counterclockwise rotation of the core, the other key 40 permits only clockwise turning of the core. This is because, when the key 40 is inserted in the lock, the notch 46 registers with the annular member 31, but the end wall 38 of the annular member 32 will strike the side of the key to prevent rotation in the counterclockwise direction. Thus, according to this construction, selective rotation of the lock is accomplished by use of the appropriate key.

A typical use for this lock construction is in connection with an alarm system. Normal operation of the lock may be by one of the keys, such as the key 23, by which the associated latch mechanism is opened through counterclockwise rotation. However, some alarm device will be provided in the system to transmit a signal when the other key 40 is used and the lock is turned in the clockwise direction. Thus, if a person is forced to surrender a key to a thief, he will provide the thief with the key 40. This will open the associated latch mechanism, which operates by being turned in either direction, so that the thief will be unsuspecting. However, it also will sound an alarm so that help can be dispatched. Of course, there will be some unobtrusive marking provided on the different keys,

4 such as for example a button 49 on the key 23, to permit them to be readily distinguished by the normal users.

One arrangement for utilizing the selectively operable lock of this invention in an alarm system is illustrated in FIGURES 5 and 6. Here, an opening 51 extends inwardly from the outer circumferential surface 52 of the cylinder 20. This opening is formed at one side of the drivers which are beneath the row of pilot holes 54, so that the inner mechanism of the lock is not affected. Into the opening 51 is inserted a switch 55, which may be bonded in place 'or otherwise appropriately secured. A portion of the switch 55 projects beyond the radial end wall 56 of the cylinder. Consequently, the actuating arm 57 of the switch is located adjacent the knurled cylindrical surface 58 of the threaded collar 59 that holds the tail piece 28 to the core 21. On the surface 58 of the collar 59 there is provided an upwardly inclined cam 60. The cam surface 60 begins at a location close to the switch arm 57, and the cam extends through an arc of around 90 or slightly more.

As shown in FIG. 5, switch 55 is provided with three leads: lead 68 is adapted to receive an input signal; and leads 66 and 67 provide output signals representing the state of the switch.

As a consequence of this construction, when the core is rotated clockwise as the unit is viewed in FIGURE 6, the cam 60 will move beneath the switch 55 to push upwardly on the switch arm 57, thereby closing the switch contacts. This can complete the circuit to an alarm, which is thereby actuated upon such rotation of the lock. When the other key is turned in the opposite direction, however, in the normal use of the lock, the arm is not moved and the switch remains open.

A simplified circuit illustrating how the alarm is activated in this manner may be seen in FIGURE 7. Alarm 64 is connected via lead 68 to the pole of switch 55, one contact of switch 55 being connected to output lead 67 to signal one state of the switch, and the other contact being connected to output lead 66 to signal the other state of the switch. An additional lead 67 connects the switch 55 to the source of current. Hence, When the switch 55 is closed, the circuit is completed to the alarm. Other circuitry may be used for the alarm depending upon the requirements of the system with which it is associated.

Another arrangement for tripping the switch in the alarm circuit is shown in FIGURES 8 and 9. In this design there is an opening 69 through the wall of the cylinder 70, corresponding generally to the opening 51 in the embodiment of FIGURES 5 and 6. However, the opening 69 is longer than the opening 51, extending substantially the length of the cylinder to the end flange 71. Near the bottom of the opening 69 is a shoulder 73 through which is a smaller aperture 74 providing communication with the periphery of the core. With the switch 75 mounted in the aperture 69, the switch arm 76 extends through the opening 74 toward the core. Formed in the surface 77 of the core in alignment with the switch arm 76 is a circumferentially extending groove 78 that extends through a substantial arc.

Normal operation of this lock will be such that the core 72 turns in a counterclockwise direction, as the device is illustrated in FIGURE 9. During this movement the switch arm remains within the groove 78. However, for the alternate turning with the other key to rotate the core 72 in the clockwise direction, the switch arm 76 is forced upwardly out of the groove 78 to engage the circumferential surface 77 of the core. This trips the switch to complete the circuit to the alarm.

The invention may be adapted for actuation by a latch or bolt mechanism as well as by rotation of the core of the lock as described above. Such an arrangement is illustrated in FIGURES 10 and ll. Here is illustrated a conventional bolt 80 that slides axially with respect to a sleeve 81 that houses it. An arm 82 is connected to the bolt 80 and is used to impart movement to the bolt when slid longitudinally by means of an associated mechanism, such as the tail piece of a pin-tumbler lock. An opening is formed in the circumferential wall of the sleeve 81 into which is inserted a switch 83, which is suitably secured in place, such as by adhesive bonding. The actuating arm 84 of the switch is thereby placed adjacent the side wall 85 of the arm 82. Within the surface 85 there is formed a small depression 86. This indentation is positioned such that, when the bolt is in the extended or locked position of FIGURES and 11, the switch arm projects into the indentation 86, and the switch remains open. However, if the bolt is moved inwardly, the arm 82 moves longitudinally to the left. This causes the switch arm 84 to be pushed upwardly along the inclined surface 87 at the end of the indentation 86 so that the switch arm 84 is pressed inwardly toward the switch and held in this position by the side surface 85 of the arm 82. Consequently, the switch is closed. This will send a signal to the alarm to indicate that the bolt has been opened.

The arrangement of the invention is adaptable also for use with a lazy-cam type mechanism, found for example in some door lock sets. As may be seen in FIG- URES 12, 13, 14 and 15, there is a collar 88 rotationally slidable relative to the cylindrical rod 89 of the lock mechanism. It is provided with diametrically opposed slots 90 and 91 into which extend the ends of a pin 92 that passes through the rod 89. Upon rotation of the rod 89 and its associated pin 92 clockwise 90 from the position shown in FIGURE 13, the collar 88 will be caused to move 90 also by the reaction of the pin against the end of the slot 90. This brings the mechanism to the position of FIGURE 14. Upon return of the rod 89 to its original position, the collar 88 will remain at the position to which it was turned by the initial clockwise rotation. The unit is then in the position of FIGURE 15. The pin 92 is free to return through a 90 are by virtue of the opposed slots 90 and 91. When the mechanism is in the position of FIGURE 15, rotation of the rod 89 counterclockwise 90 will return it to the position of FIGURE 13, again moving the collar 88 back to that location.

A switch 94 is associated with this unit, positioned so that its actuating arm 95 is immediately above the periphery of the collar 88. An upwardly extending carn element 96 is carried by the collar and aligned with the switch arm 95.

Consequently, when the mechanism is in the position of FIGURE 13, the cam 96 is remote from the actuating arm 95. However, upon rotation to the position of FIG- URE 14, the cam moves beneath the arm of the switch, thereby tripping the switch to change the position of its contacts. Then, when the rod 89 is returned counterclockwise 90 from the position of FIGURE 14 to that of FIGURE 15, the collar 83 remains in place with the cam 96 beneath the switch 94. Therefore, the switch arm will remain depressed upon this return movement. The switch arm 95 will be allowed to move away from the switch body only upon a further rotation of 90 of the rod 89, which brings the mechanism back to the position of FIGURE 13. The switch 94 will be incorporated into an appropriate electrical system to indicate the condition of the lock device as reflected by the position of the lazy cam and the movement of the switch arm.

The selective rotation of the lock may be accomplished through the action of pins and drivers, rather than the stop elements described above, in which event the keys are made different along their working edges rather than being notched. This type of construction is illustrated in FIGURES 16 and 17. Here, the core 98 is provided with a pair of axially spaced circumferentially extending grooves 99 and 100 and its circumferential surface 101. The groove 99 extends arcnately in one direction with respect to the broached hole 102 for the key, and the groove 100 extends from the opening 102 in the opposite direction. Aligned with the groove 99 is a pin 103 above which is a driver 104 urged downwardly by a compres- 6 sion spring 105. Similarly, there is a pin 106 aligned with the groove 100, together with the driver 107 and spring 108.

In order to rotate the core 98 in the counterclockwise direction, a key 110 is inserted into the opening 102. The top edge 111 of this key is contoured to move all the pins and drivers upwardly to where their abutting surfaces are at the normal shear line of the lock. This holds true for the pin-and-driver set 106 and 107 as well as the others of the lock. However, the pin and driver 103 and 104 are moved to where their adjacent surfaces are at the bottom wall 112 of the groove 99. This becomes the shear line for this segment of the lock. The core then can rotate through 90 in the counterclockwise direction until the end surface 113 of the groove 99 is brought against the side of the driver 104. Rotation in the clockwise direction cannot take place, however, because the end wall 114 of the groove 99 is adjacent the driver and stops such movement.

For movement in the clockwise direction, a different key 115 is inserted in the hole 102. This key is the same as the key 110 except that its upper edge 116 moves the abutting ends of the pins and drivers to the normal shear line of the lock except for the pin 106 and driver 107. The latter elements are brought to the bottom wall 117 of the groove 100. Therefore, rotation clockwise can take place until the end 118 of the groove 100 contacts the driver 107. counterclockwise rotation is blocked because the end 119 of the groove 100 is adjacent the driver 107 and will not allow such movement.

With this design, a third key will be provided to raise all the drivers to the normal shear line. This allows removal of the core.

In the design of FIGURES 18, 19 and 20, two keys are utilized, one of which is notched and the other of which is not. By this construction, one key can rotate the lock through a full 360, while the other can turn it through an arc of less than 360. This is useful where there is an automatic spring lock that can be neutralized when thet lock is rotated at 360, but which remains in operation when the lock is turned through a lesser arc. It may be desirable to have some personnel have possession of a key which can never neutralize the automatic lock. Other personnel will be given the key which can rotate the full 360 to neutralize the lock.

In this arrangement, core 120 in the cylinder 121 has an annular groove 122 circumscribing it. A stop pin 123 extends through the cylinder and into the groove 122. When the unnotched key 124 is inserted into the broached hole 125 (FIGURE 18), it cannot turn a full 360 be cause its surface 126 will be brought against the stop pin 123 before this can occur.

However, the other key 127 is provided with a notch 128. This notch is in registry with the groove 122 and pin 123 when the key 127 is fitted into the core. Therefore, the notch will clear the pin 123 and allow the core to be turned the full 360 arc. Consequently, when the key 127 is used, the lock can be neutralized, but not when the key 124 is used.

The arrangement of this invention can be utilized also in connection with a maximum security type lock; in accordance with the arrangement seen in FIGURES 21 through 26. This lock 129 includes a bolt 130 pivotal about a pin 131 that extends between the side plates 132 and 133. The bolt 130 may be rotated inwardly to a retracted position between'the side plates 132 and'133, or pivoted to project outwardly through the opening 134 and end plate 135 when in the locked position. The pivotal movement of the bolt 130 is effected by a crank 137 pivotal about the axis of an additional cross pin 138. The pin 138 has a splined exterior that engages the crank 137 so that the pin 138 rotates with the crank 137. A pin 139 connects the other end of the crank 137 to the bolt 130 in a recessed area 140 by extending through a slot 141 in the bolt.

The crank 137 is rotated by either of the tailpiece elements 143 and 144 which are at the inner faces of cylinders 145 and 146 that are mounted in the side plates 132 and 133. Typically, one of the cylinders 145 will be actuated by a key, while the other 146 can be manually rotated from the inside through a knob 148.

The tailpiece elements 143 and 144 include projections 149 and 150, which are adapted to engage the pins 152 and 153 projecting transversely outwardly from the crank 137. This engagement results in the rotation of the crank 137 when either member 143 or 144 is turned. In other words, either of the projections 149 and 150 (depending upon which is turned) will engage the pin 153 in rotating the crank 137 counterclockwise, is illustrated in FIG- URE 23. This movement will cause clockwise rotation of the bolt 130, retracting it to the space between the side plates 132 and 133. The other pin 152 is engaged by the extension 149 or 150 in returning the crank 137 to the position of FIGURE 23. The extensions 149 and 150 also cam the spring-loaded detent 155 out of the end section 156 or 157 of the opposed slots 158 in the side plates 132 and 133 when the bolt is to be moved from one position to the other.

In accordance with the provisions of this invention, a switch 160 is mounted on the side plate 132 immediately adjacent the pin 138 that rotates with the actuating crank 137. A cam element 161 is formed on the periphery of the pin 138 adjacent the switch arm 162. Consequently, the cam 161 will depress the switch arm 162 when the bolt is in the closed position of FIGURE 23 and FIG- URE 24. On the other hand, when the bolt is open and the actuating crank 137 is moved to its alternate position, the cam leaves the switch arm 162, allowing it to extend. In this instance, therefore, the rotary movement of a portion of the bolt mechanism is utilized in actuating the switch. Typically, the switch 160* will be normally closed and hooked into an alarm system such as shown in FIGURE 26. Therefore, by opening the bolt 130, the circuit to the alarm through the conductors 163 and 164 will be closed so that the alarm will become activated. Usually a time delay 165 will be incorporated into such an alarm system so that the alarm 166 is not immediately energized. Thus, an employee authorized to operate the bolt will open the bolt and then disconnect the alarm by opening a second manually operable switch 167. The time delay will preclude actuation of the alarm until an adequate period has passed for opening the switch 167 to prevent the alarm from becoming activated. On the other hand, when an unauthorized person opens the bolt 130, he will be unaware of the necessity for deactivating the alarm system. Consequently, after a predetermined period of time the alarm will signal that the bolt has been opened improperly.

It can be seen, therefore, that the basic teachings of this invention can be given many variations in accomplishing results to suit particular needs. The different types of stops, cams, etc., may be arranged in diiferent combinations as desired. Complete selectivity of the operation of the lock can be achieved.

The foregoing detailed description is to be clearly understood as given by way of illustration and example only, the spirit and scope of this invention being limited solely by the appended claims.

What is claimed is:

1. In combination with a pin-tumbler lock having a cylinder and a core rotatable relative to said cylinder, said core having a key-receiving aperture therein, an arrangement for selectively signalling the condition of said lock comprising: a switch in said cylinder, having an actuating arm and a pole and at least one contact; first means operable upon rotation of said core in one direction starting from the initial key insertion position for moving said actuating arm to establish a signal path between said pole and said contact, said first means being also operable upon rotation of said core in a direction opposite to said one direction starting from said initial key insertion positon to release said actuating arm; and second means for defining a selective operation of said lock whereby separate keys may be used to actuate or release said actuating arm and thereby actuate or release said switch, said second means comprising a duality of stop members carried by said cylinder, said stop members being axially spaced with respect to said cylinder, said core having a duality of circumferentially extending grooves in the periphery thereof, the first of said grooves being aligned with the first of said stop members, and the second of said grooves being aligned with the second of said stop members, each stop member extending into the groove aligned therewith, the first of said stop members, being positioned on one side of said key-receiving aperture, and the second of said said stop members being positioned on the opposite side of said key-receiving aperture.

2. In combination with a lock having a cylinder and a core rotatable relative to said cylinder, said core having a key-receiving aperture herein, an arrangement for producing an output signal in response to an input signal, said output signal relating to the direction of turning of the key from a reference insertion position, said arrangement comprising: stop and groove means in said cylinder and said core defining clockwise or counterclockwise freedom of movement for a key from said reference insertion position said key having a notch thereon, the direction of turning of said key from said reference insertion position depending upon the alignment of the notch on the key used as related to said groove, each groove 'being aligned with a respective stop member; a switching device carried by said cylinder having an actuating arm with a pole and at least one output terminal; and switch actuating means connected to said core such that clockwise rotation of said core from said reference insection position by means of a key with the clockwise permitting notch causes setting of said switching device to a state where current may pass through said pole to said terminal, and counterclockwise rotation of said core by means of a key with the counterclockwise permitting notch causes setting of said switching device to a state where current may not pass through said pole to said terminal.

3. A key actuated selective signalling system for a pintumbler lock having a cylinder and a core rotatable therein, said system comprising: a switch having an actuating arm, a pole and a least one contact; means on said lock for applying an input signal to said pole and for deriving an output signal from said switch; selective rotation means in said core restricting rotation of a key with certain notches therein to rotation after insertion in one direction; means providing a direct rotation actuation of said actuating arm for the operation of one key causing clockwise rotation after insertion to cause said output signal to represent said input signal; and means providing a direct rotation release of said actuating arm upon operation of a different key causing counterclockwise rotation, after insertion to terminate said output signal.

4. In a pin-tumbler lock having a cylinder and a core rotatable within said cylinder, the cylinder containing drivers and the core containing pins corresponding to said drivers, respectively, the juncture between said pins and drivers defining a shear line, the improvement for providing selective operable bidirectional signalling comprlsmg: a switch having an arm, a pole and at least one contact; means in said core for adjusting said shear line at one juncture to restrict rotation of said core with the proper key to one direction from the initial insertion position of said key; and for adjusting said shear line at a second juncture to restrict rotation of said core with the proper key to a second direction, opposite to said one direction; a cam; means for causing said cam to rotate against said switch arm and to close said switch to provide a closed circuit between said pole and said contact for rotation of said core in said one direction; and means for causing said cam to rotate away from said switch arm to release said switch for rotation of said core in said opposite direction to the initial one direction from said insertion position of said key.

5 References Cited UNITED STATES PATENTS 752,624 2/1904 LaBelle 70-420 X 1,685,022 9/1928 Cleaver 70337 X 10 1,785,634 12/1930 Lawrence 70-337 X 1,808,491 6/1931 Bellman 340274 X 2,009,640 7/1935 Stone 70-337 Golokow 340274 X Opocensky 70337 Thibeville. Schlage 70-420 :Harry 200-61.64 Haupt 70337 X FOREIGN PATENTS 6/ 1940 Great Britain.

Germany.

NEIL C. READ, Primary Examiner.

R. GOLDMAN, D. L. TRAFTON, Assistant Examiner.

Claims (1)

1. IN COMBINATION WITH A PIN-TUMBLER LOCK HAVING A CYLINDER AND A CORE ROTATABLE RELATIVE TO SAID CYLINDER, SAID CORE HAVING A KEY-RECEIVING APERTURE THEREIN, AN ARRANGEMENT FOR SELECTIVELY SIGNALLING THE CONDITION OF SAID LOCK COMPRISING: A SWITCH IN SAID CYLINDER, HAVING AN ACTUATING ARM AND A POLE AND AT LEAST ONE CONTACT; FIRST MEANS OPERABLE UPON ROTATION OF SAID CORE IN ONE DIRECTION STARTING FROM THE INITIAL KEY INSERTION POSITION FOR MOVING SAID ACTUATING ARM TO ESTABLISH A SIGNAL PATH BETWEEN SAID POLE AND SAID CONTACT, SAID FIRST MEANS BEING ALSO OPERATBLE UPON ROTATION OF SAID CORE IN A DIRECTION OPPOSITE TO SAID ONE DIRECTION STARTING FROM SAID INITIAL KEY INSERTION POSITION TO RELEASE SAID ACTUATING ARM; AND SECOND MEANS FOR DEFINING A SELECTIVE OPERATION OF SAID LOCK WHEREBY SEPARATE KEYS MAY BE USED TO ACTUATE OR RELEASE SAID ACTUATING ARM AND THEREBY ACTUATE OR RELEASE SAID SWITCH, SAID SECOND MEANS COMPRISING A DUALITY OF STOP MEMBERS CARRIED BY SAID CYLINDER, SAID STOP MEMBERS BEING AXIALLY

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