US1604978A - Alarm lock - Google Patents

Description

Nov. 2 1926- 1,604,978

T. A. CRONIN ALARM LOCK Filed August 9, 1924 4 Sheets-Sheet 1 a fly". Z a

Nov. 2 1,604,978

T. A. CRONIN ALARM LOCK Filed August 9. 1924 4 Sheets-Sheet 2 4 8 gwue'nlot auom T. A. CRONIN ALARM LOCK Nov. 2 v 1926- I I 1,604,978

Filed August 9, 1924 4 Sheets-Sheet 5 T. A. CRONIN NOVQ 2 ALARM LOCK Filed August 9. 1924 4 Sheets-Sheet 4 gwuento'o 7'11 Ckonzn Patented Nov. 2, 1936.

UNITE stares r'rsr tries.-

ALARM LOCK.

Application filed August 9, 1924. Serial No. 731,132.

My invention relates to alarm locks and has for its object theprovision of a lock which may be readily applied to a door and which when applied, will present a neat and attractive appearance and by the use of which the unauthorized opening of the door or retracting of the bolt will sound an alarm so as to notify occupants of the house and persons in the vicinity of the intrusion. The

' invention provides means housed within a door and carried by a lock case to be operated by the movement of the bolt so that when the bolt is projected and thedoor locked, the alarm will be set for operation and retraction of the bolt will then result in the sounding of an alarm. The invention also provides means whereby the sounding of the alarm may be stopped by the occupant of the dwell.- ing or apartment by the use of a key or keys which are to be retained in his possession and which may be of distinctive formation so that a key will iit only the lock for which it is furnished. The invention is illustrated in the accompanying drawings and will be hereinafter fully set forth.

In the drawings:

Figure 1 is a View partly in section, of a door equipped with my improved lock and illustrating an electric circuit whereby an alarm may be sounded. at a distant point upon the retraction of the lock bolt;

Fig. 2 is an enlarged elevation of the lock showing more particularly the escutcheon plate which is secured tothe inner side of the door; 1

Figs. 3 and i are detail elevations of inner portions of the escutcheon plate;

' Figs. 5, 6 and 7 are elevations of the lock with the face plate or cover removed and showing the alarm elements in different positions;

Fig. 8 is an elevation of the lock with the cover plate in position thereon; V

Fig. 9 is a bottom plan view with parts in section on the line 99 of Fig. 2;

Fig. 10 is a detail sectional elevation on the line 10-1O of Fig. 9;

Fig. 11 is an enlarged detail section on the line 11-11 of Fig. 5;

Fig. 12 is a similar view on the line l2-12 of Fig. 5;

Fig. 13 is a similar of Fig. 5;

View on the line 13- -13 Fig. 14 is a similar view on the line 1t14 of Fig. 6,, and

Figs. 15, 16 and 17 show keys be furnished with the lock.

In Fig. 1. I have shown a door 1 having my improved lock titted thereto, the figure showing an escutcheon plate 2 and also illustrating a means whereby an electric. bell, indicated at 3, located at a point distant from the door may be actuated when the bolt is retracted. The lock shown comprises a lock. case 4; secured within a mortise in the door and provided with a sliding bolt 5 which may be of any well-known form and operated by a key 6. The lock also equipped with a latch '2' controlled through a knob spindle 8 in the usual manner. The inner plate of the lock case 4- is constructed with a horizontal slot 9 and a pin or stud 1O projects from the side of the bolt through the said slot to engage in a slot 11 formed in a rocking arm or lever 12 which is fulcii'umed upon the side of the lock case, as. shown clearly in Figs. 5, 6 and 7 the fulcrum 13 being disposed near the upper end of said lever or rocking arm. It willbe readily seen that the retracting or projecting movements of the bolt 5 will effect oscillation of this arm 7 or lever 12, and it will presently appear that the oscillation of this rocking arm causes the alarm-sounding mechanism to operate- A bracket 14 is secured to the side of the lock case through the medium of diverging arms 15 extending from its central body portion and having fastening screws or similar devices inserted through their ends into the side of the lock case as will be understood. This bracket is located near the slot 9 and the lower end of the rocking arm 12 plays beneath the bracket. A. cover plate 16 is secured upon and carried by the bracket, and this plate is approximately coextensive with the side of the lock case so that it extends over and protects the working elements. One lower corner of this plate is slitted and the tongue 17 thereby formed is bent inwardly so that it constitutes a gong upon which the hammer of an alarm may play. The plate 16 is also provided with a plurality of openings "1.8 properly located to permit a key, such as that shown at 19 in Fig. 15, to be inserted into engagement with the several alarm-controlling elements so that the alarm which may may be set to operate or set in an inoperative position. The key is designed to engage slots formed in these several elements of the alarm mechanism and the end of the key may be provided with corrugations of any desired form to fit the correspondingly shaped slot in the respective elements whereby the lock can be adjusted only by the person holding the proper key.

The escutcheon plate 2 is somewhat larger than the cover plate or gong 16 so that the edges of the escutcheon plate will project beyond the edge portions of the lock and permit wood screws 21 to be inserted through the escutcheon plate into the body of the door to'secure the plate in position. The escutcheon plate is provided with a keyhole slot, indicated at 22, and a-lining with a similar slot 23 formed in the cover plate 16 and a similar slot 24 formed in the lock case so that the key 6 may be easily inserted into engagement with the bolt 5. The escutcheon plate is also provided with openings 25 which, when the parts are properly assembled, will register with the openings 18 in the plate 16. On the inner side of the escutcheon plate and covering the respective openings 25 are closure plates 26 provided with slots 27 of the same outline as the working end of the key 19 whereby the key may be inserted through the said plates to engage the corresponding slots in the several elements of the alarm which are to be adjusted. These plates 26 are held to the escutcheon plate by headed studs or similar devices 28 which pass throughslots 29 in the respective plates to be secured in the escutcheon plate. free movement of these covering plates being thus permitted to the extent limited by the slots 29. Access to the several elements of the alarm mechanism is thus rendered more ditficult and all parts are protected against an accumulation of dust or other foreign matter.

The upper end of the rocking arm 12 is disposed between switch members 30 and 31 which are pivotally mounted upon the side of the lock case, the member 30 being a straight member and pivoted at its lower end. as at 32, while the member 31 is an angle lever pivoted above its lower end, as at 33. A stop pin 34 is provided adjacent each of these switch members so that the circuitbreaking movement thereof will be limited. The switch member or lever 30 is provided adjacent its pivoted end with a: longitudinally disposed slot 35 which may be engaged by the key- 19 when the sounding of the alarm is to be arrested so that the levermay be-swung about its pivot and away from the fixed contact member. The switch member or lever 31 is likewise provided with a similar slot 36 which may beengaged by the-key lib The upper-extremity of each of these switch levers constitutes a contact in the form of a tongue 37 of suitable conducting material secured to the lever member by a coupling plate 38 of fiber or other insulating material, as shown clearly in Fig. 11. Electric conductors 39 and40 are secured to these terminals and may be carried to any distant point, as indicated in Fig. 1, so as to establish a circuit through the bell3. Secured upon the side of the lock case between the terminals 37 of the levers 30 and 31 is a fixed contact or switch member 41 which is grooved or slitted at its ends as shown at 42, to receive the terminals 37. which will fit snugly within the said end portions and thereby form good electrical contact with the same. An insulating sleeve 43 of fiber or like material is formed about the contact member 11 at the center thereof, and the said member is secured rigidly to the lock case by a clip 414 passed over the said insulation and having screws or similar devices 45 inserted through its ends into the lock case.

When the alarm is not to operate, the switch members 30 and 31 are both disposed with their terminals 37 out of engagement with the intermediate stationary contact 41.

Wben the dooris locked, the switch member 30 rocked into engagement with the adjacent end of the contact 41 through the use of the key 19 while the switch member 31 is set in the position shown in Fig. 5. The lever or rocking arm 12 will assume the po sition shown in Fig. 5 when the bolt 5 is projected but when the bolt is retractechthc stud 1 0 constituting a connection between the bolt and the said lever-will rock the lever to the position shown in Fig. 6, causing its upper free end to impinge upon the end of the switch member 31 and rock the same into the position shown in Fig. 6, whereupon the terminal of said lever will engage the fixed con tact l1 and close the circuit through the bell 3 to sound an alarm. The bell will continue to ring until the householder has swung the lever30 to the position shown in Fig. 7 there by breaking the circuit. The arrangement of the parts 12 and 31 is such that the alarm will be sounded before the bolt is fully with drawn or the door opened and, consequently the householder will have a chance to. reach the door before the burglar or other unauthorized individual has etl'ected entrance. ll hen'the bolt is again projected, the rocking arm 12 will be returned to the position shown in Fig. 5, but the lever arm 31 will remain in the position shown in Figs. 6 and 7 unless it be shift-ed to the position shown in Fig. 5 by the use otthe key 19. It will thusbe seen that the device is very simple and compact and will operate etliciently to sound an" alarm whenever the locle may be opened after the alarm elements have'been set for'operation. The alarm will preferably be audible but it may be visual inuthc form of a light which will flash when the circuit is closed through the rocking of the switch member 31 or it may be of any other approved term as may be desired. l i hen the device is not to operate, the switch member 30 is in the position shown in F 7 and the circuit through the alarm will, consequently, remain broken. Then the alarm is to operate, however. the said member is setas shown in Figs. 5 and 6, and the switch member 31 is returned to the position shown in Fig. after each operation of the alarm.

It is possible the electric alarm might fail to operate sometime when its proper op eration was exceedingly desirable. To guard against this contingency; I provide a me chanical alarm which is also controlled through the action of the rocking arm or lever 12. To the lower end of the said lever is pivoted a link 46 which connectsthe same with the upper end of an angle lever 4L7 tnlcrumed at its angle upon a frame plate 48 which is secured to and depends from the lower end of the lock case 4. This angle lever 47 has a lateral toe 49 at its free end which is adapted to-engage under the adjacent end of a bent lever 50 which is fulcrumed upon the "frantic. plate .48 and has its end remote from the toe 49 disposed above and adapted to bear against a lug 51 at the free end at an escapement lever or detent 52 which is pivoted, as at 52, upon a plate as which is arranged adjacent the frameplate 48 and supported by bolts or rivets from a frame plate 54 which is secured to and depends from the lower end of the lock case back plate. See Figs. 9 and 10. This escapement lever or detent 52 is also provided with a tooth 53 which is adapted to engage between the teeth 54 of an escapement wheel 55 constituting'a part of the alarm mechanism. The said escapement wheel 55 is rotated through a train of gearing 56 actuated by a spring motor57 in a well-known manner, the motor spring being secured at its inner end to a shaft 58 which is journaled in the frame plates 48 and 5'4 and extends through the plate 48, as shown at 59,130 be engaged by the winding key 60. The lug 51 of the det'ent 52 engages inan opening 61 in the lower end of a stop lever or latch (31'. the said stop lever or latch being pivoted at its upper end, as at 62, to a rocker 63 extending inwardly with respect to the said lever or latch and having its inner end doubled under its main portion, asshown most clearly at 64 in ig. 14-, the said doubled under terminal being pivotally mounted upon a screw 65 secured in the side of the lock case 4 and the main portion of this rocker 63 being provided with a slot 66 immediately over the pivot 65 whereby the said member 63 may be engaged by the key 19 and set to permit or prevent the operation of the alarm. If the rocker 63 be swung upwardly, the detent 52 will likewise be swung upwardly so that the tooth 53 will be caused to engage the escapement wheel 55 and will prevent rotation ot the/same. At the same time, the lug 51 through it-scontact with the outer end of the lever 50 will rock the said lever to maintain its engagement with the angle lever 47 which is then in the position. shown in Fig. 5, the bolt having been pro je-cted. When the bolt is withdrawn, the

lever or rocking arm 12 will be rocked to the position shown in Fig. 6 and, consequently, the levers 4L7 and 50 will be likewise rock-ed to the positions shown in said figure and the rocking oi? the lever 50 will cause the lug 51 to swing downwardly so that the detent will be released from the escapement wheel 55 and the said wheel may then rotate under the influence of the spring 57. Disposed immediately adjacent the escapement wheel 55 and provided with a. head 67 i is a hammer 68 which has its shank 69. extended transversely between the plates 48 and 54 and then upwardlyto-be connected with the head 67 and hung upon the pivot rod 70. The head 67 is so constructed that it willbe oscillated through the frame engagement of the teeth 54 with the corners tracting of the bolt 5 without sounding the alarm, the stop or brake member 71 is employed. This stop or brake member consists of a bar provided with a forked head immediately adjacent the hammer 568 and adapted to project into the'range. of movement of the shank 69 to abut the: shank so that movement otthe' hammer willbe arrested. The stop bar is provided with an oftset portion 7 2. which extends through a slot 7 3 in the frame plate 48 and permits'the in- I ner end of the bar to be pivoted to thelower end of a link 74 which is pivoted at its upper end upon thesaid frame plate 48. This swinging link 74 is provided with a slot 75 which may be engagedby the'key 19. When the alarm is not to operate, the key 19 is engaged in the slot 7 5 and the link 74- set in the position shown inFig- 7, whereupon the forked head of the stop or brake member will be disposed immediately at the side of the shank 69 so that the swinging of the same will be prevented. This adaptability oi the'lock to permit the door to be locked without having the alarm set for use is advantageous in daylight hours but at night the lock may be quickly and easily set to cause an alarm to be sounded whenever the bolt is retracted, and when the alarm starts to ring it will continue to operate until stopped by the householder setting one of the switchlevers 30, 31 or the link 74 or the latch 61. The mechanical alarm will obviously be sounded immediately at the door and will serve notice upon the burglar that his presence is known or shortly will be known so that he will leave the premises rather than run the risk of capture, while the electric alarm permits the alarm to be sounded at any desired distance and give notice notonly to the occupants of the premises but to per sons in the vicinity so that the capture of the burglar will be rendered almost certain.

It is to be understood that the alarm may be combined with any form of lock and that its showing in connection with an ordinary mortise lock in the accompanying drawings is merely for convenience.

Having thus described the invention, I claim:

1. Thecombination of a lock including a bolt, alarm mechanism mounted on the side of the lock and including elements operativ'ely connected with the bolt, some of said elements having key-receiving openings therein, means for actuating the alarm mechanism, a plate secured'upon the side oi the lock over the alarm elements and provided with openings therethrough registering with the openings in some of said elements, a key member engage'able through said plate and in the openings in the alarm elements to set the alarm elements, and means for covering the said plate and the openings throi'ighthe same.

2. The combination of a lock including a bolt, an alarm, means -monnted on the side of the lock for actuating the alarm, elements operatively connected with the bolt for releasing s'aid alarnractuating means, an escii-tch'eo'n plate s'ecuredover the side of the lock and the said alarm-actuating means and releasing elements, the escutcheon plate having openings therethroug zh cover plates slidably mounted on the inner side of the escutcheon plate and extending across the openings therein, said cover plates being provided with key-receiving slots to permit access to "the alarm releasing elements for setting'the same, and means on the escutcheon plate for limiting the movement of said cover plates. V

3. The combination of a lock including a 'slidable belt, a locking arm mounted on the reoaevs 4. The combination of a lock including a slidable bolt, a gong mounted on the side of the look, a rocking lever mounted upon the side of the lock and operatively connected with the bolt, a hammer supported from the lock and arranged to play upon the gong, a detent arranged to prevent movement of the hammer, a key-controlled latch slidably mounted on the side of the lock and engaged with said detent to maintain the same in the hammer-arresting position, and operative' connections between the said latch and the rocking arm whereby retrac tion of the bolt will releasethe detent and permit the hammer to operate. i

5. The combination of a lock including a slidable bolt, a rocking arm mounted on the side of the lock and operatively connected with the bolt, a gong carried by the lock, a hammer arranged in position to play upon the gong, a detent arranged adjacent the hammer and normally preventing the oper ation of the same, a latch engaged with said detent and key controlled to set the detent, a bent lever having one end engaged with the detent, a second lever having one end engaged under the inner end of said bent lever, and a link connecting the second lever with the rocking arm whereby retraction of the bolt will effect rocking of the levers and release the detent to permit operation of the hammer.

6. The combination of a lock including a slidable bolt, a gong, a hammer arranged to play upon the gong, means'for causing the hammer to operate, means operatively connected with the bolt for controlling the lastmentioned means, a key-engaging link pivotally supported below the lock case, and a brake'arm pivoted to the lower end of said link and slidably supported by the lock case and adapted to engage the shank of the hammer to hold the same against operation.

In testimony whereof I afliX my signature.

TIMOTHY ALOYSlUS CRONIN. [1 s.]

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