US1894177A - Safety lock - Google Patents

Description

Jan. 10, 1933. c. H. JOHNSTON SAFETY LOCK Filed July 11, 1928 2 Sheets-Sheet 1- INVENTOR AITORNEY Jan! 10, 1933.. c. H. JOHNSTON SAFETY LOCK 2 Sheets-Sheet 2 Filed July 11, 1928 ATTOR NEY Patented Jan. 10, 1933 PATENT OFFICE CHARLES H. JOHNSTON, OF STEUBENVILLE, OHIO SAFETY LOCK Application filed July 11,

My present invention has reference to the class of locks commonly known as cylinder locks, and the primary object of my invention is the construction and arrangement of a tumbler case in the lock case in a manner that will hold the tumbler case against any possibility of revolving or withdrawal, except in the proper manner when the door is open, and which will render the attachment of the tumbler case to the lock case easy and efficient without the employment of a special tool and by unskilled mechanics.

A still further object is the provision, in a cylinder lock, of a tumbler case which has a ratchet and locking engagement with the lock case and wherein the tumbler case is of such construction and arrangement of parts as tofully protect the same from picking or being otherwise unlawfully operated.

The invention will be fully and comprehensively understood from a consideration of the following detailed description when read in connection with the accompanying drawings which form part of the application, with the understanding, however, that the improvement is capable of extended application and is not confined to the exact showing of the drawings nor to the precise construction described and, therefore, such changes and modifications may be made therefrom as do not afiect the spirit of the invention nor eX- ceed the scope thereof as expressed in the appended claim.

In the drawings:

Figure 1 is a front elevation of my improvement.

Figure 2 is a side elevation thereof.

Figure 3 is a top plan view thereof.

Figure 4t is a sectional view approximately on the line 4-4: of Figure 2.

Figure 5 is an enlarged sectional view approximately on the line 55 of Figure 2.

Figure 6 is a perspective view of one of the ratchet blocks.

Figure 7 is a rear end view of the tumbler case.

Figure 8 is a perspective view of the second ratchet block.

. Referring now to the drawings, the numeral 1 designates the lock case that is pro- 1928. Serial No. 291,765.

vided with the usual removable side and with the face plate 2. The dead-bolt which is operated by my improvement is disclosed by the dotted lines in Figure 2 and is indicated by the numeral 3. As any desired type of bolt may be operated by my improvement a detailed description of such bolt and the mechanism associated therewith is not believed necessary, it being thought suflicientto state that a spring influenced tumbler 4 pivotally associated withthe latching bolt is normally retained between two spaced detents 5, and that the end of the tumbler received between the detents is movable therebetween by the fingerfi which is provided upon one end of the cylinder lock.

The lock case and its face plate 2 have transverse substantially rectangular alining openings therethrough adjacent to the top of the case. These openings for distinction are indicated by the numerals 7 and 8 and the rear end or side walls of each of the openings are formed with oppositely directed ratchet teeth 9 and 10, respectively. The lock case, adjacent to'the straight side wall provided by the opening 7 is formed with an inwardly directed lug 11, and this lug has its outer face notched, as at 12. lVhile I have stated that'the openings 7 and 8 are of rectangular formation they may, of course, be of any desired shape and the opening 7 is designed to receive therein a tumbler case 13.

In the showing of the drawings this tumbler case 13 has its body of rectangular formation and has its opposite sides provided with ratchet teeth 1e and 15, the ratchet teeth 14 designed to coengage with the ratchet teeth 10 in the opening 8 of the lock case 1. It is to be noted that all of the ratchet teeth provide inner straight shoulders and angle walls connecting the shoulders and the angle walls of the ratchet teeth on the tumbler case 13 are directed outwardly, while the ratchet teeth 9 are oppositely directed. The ratchet teeth 10 have their angle shoulders directed inwardly with respect to the lock case.

The escutcheon plate 16 is integrally formed on the outer end of'the tumbler case, and this plate,'at its juncture withthe body of the tumbler case is formed with a comparativelv deep continuous groove 17 so that the escutc eon plate is weakened at its connection with the tumbler case and will be torn ofi the body of said case should an eutward pull be exerted therea-gainst after the tumbler case is inserted and locked in the lock case.

The tumbler case, of course, has arranged in its bore the usual plug 18 provided with the key-way 19 and also provided with openings for the pins that are forced into the keyway by the spring influenced pins arranged in the tumbler case. Outward but in a line with the tumbler pins and adjacent to the escutcheon plate 16 there is passed through the tumbler case a pin 20 of hardened steel. The plug 18 is provided with an annular oove 21 that receives the inner end of the pin 20 therein.

Screwed or otherwise fixed on the inner end of the plug 18 there is the finger 6.

The lug 11, after the plug is inserted in the openin 7 provides what I will term a pocket in the ock case 1, and in this pocket there IS received a ratchet block 22. The teeth provided upon one face of the ratchet block are arranged in series from the center thereof, one of such series of teeth indicated for distinction by the numeral 23, being pitched to engage with the ratchet teeth 15 on the side of the tumbler case, and the other series of teeth, indicated by the numeral 24, being oppositely pitched. After the tumbler case is artly inserted through the opening 7, there is inserted in the opening 8 a second ratchet block 25. This ratchet block has its ends formed with ratchet teeth 26 and 27, respectively which are oppositely pitched, the teeth 26 designed to coengage with the teeth 10 in the opening 8 and the teeth 27 are designed to be engaged by the teeth 24 of the slidable ratchet block 22. Of course, the opening 8 is of a width greater than the width of the block 25, so that the said block 25 is movable laterally through the opening 8 which, of course, is true with respect to the tumbler case when arranged in the opening 7.

The ratchet block 22 is centrally formed from its straight face with a threaded bore 28 in which there is received the threaded end 29 of a headed screw or bolt The bolt 30 has a reduced portion 31 that is received in the notch 12 of the lug 11, and the head of the bolt is received in an opening in the face late of the lock case. The head of the bolt is kerfed for the reception of a screw driver and obviously by turning the bolt the ratchet block 22 will be imparted a longitudinal movement to firmly bring the teeth of the said block into engagement with the teeth 15 of the tumbler case and the teeth 27 of the block 25 to force the said tumbler case and the said block 25 through the openings 2 and 8 and to bring their teeth 26 and 14 into coengagement with the ratchet teeth 10 and 9 in the end walls of the said openin s 7 and 8. In this manner it will be seen thfltfi1y simply adjusting the screw the tumbler case can be easily, quickly and effectively secured in the lock case. Because of coengagement between the ratchet blocks, the tumbler case and the toothed walls provided by the openings 7 and 8 it will be impossible to turn the tumbler case in the lock case the door to which the lock is applied is opened and the bolt 20 is unscrewed. As previousl stated, should an attempt be made to pull t e tumbler case out of the iock case, the head of the escutcheon plate 16 will be severed. Should an attempt he made to bore through the tumblers after a dummy key has been inserted in the key-way in the plug, the bit contacting with the hardened steel pin 20 will be deflected and forced awa from the pins or tumblers.

l\' y improvement is extremely simple in construction but will render this type of lock positively burglar-proof and it is believed that the foregoing description will fully set forth the construction and advantages of the invention to those skilled in the art.

Having described the invention, I claim:

The combination in a lock, of a lock ease having substantially rectangular openings in the opposed sides thereof, one wall of each opening having ratchet teeth, with the teeth on the wall of one opening being reversely disposed with regard to the teeth of the other opening, a cylinder lock for operatin the bolt of said lock, said cylinder including a tumbler case received by one of said openings for lateral sliding movement therein, ratchet teeth formed on the opposed sides of said case, a ratchet block positioned in the other of said openings for iateral sliding movement, and

having reversely disposed ratchet teeth formed on the opposed edgesthereof, the teeth on one edge of said block and the cor respondingside of said tumbler case being adapted to engage the teeth of said openin s, second ratchet block slidable within tie lock caseand having one side formed with spaced series of oppositely disposed ratchet teeth, adapted to engage the teeth on the opposite side of the first mentioned block and the adjacent side of the tumbler case, a notched lug projectingwithin the case, and a bolt having threaded connection with the second mentioned block, and journaled in said lug, and operable to move the second mentioned block into effective engagement with the first mentioned block and the teeth of said tumbler case.

In testimony whereof I allix my signature.

CHARLES H. J OHB STON.

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