US1020874A - Pin-tumbler lock. - Google Patents

Description

P. F. AUGENBRAUN.

PIN TUMBLER LOOK.

APPLICATION FILED DEC. 28, 1011.

Patented Mar. 19, 1912.

UNITED, sTATEs PATENT OFFICE.

PETER. F. AUGENBRAUN, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE & TOWNE MANUFACTURING COMPANY, OF STAMFORD, CONNECTICUT.

PIN-TUMIBLER LOCK.

- To all whom it may concern RRAUN, a citizen of the I) Be it known that I, PETER F. AUGEN- *nited States, residing at Stamford, in the county of Fairfield and Stateof Connecticut, have invented certain new and useful Improvements in Pin- Tumbler Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable other'sskilled in the art to which it appertains to make and use the same.

by the bittings of the key, and as the tumblers engage the bittings of the key, the latter is'held against withdrawal. It is obvious that in a lock of this type, every time a key is inserted and withdrawn, both" the tumblers andthe drivers are raised and lowered in their recesses, and that when the key is pushed into place the tumblers tend to bear against one side of the tumbler recess, and when the key is withdrawn,tend to bear against the other, and at the same time to move up and down within the recess. In

case of locks which are used very frequently,

this action results in considerable wear, andmay'after a time result in unsatisfactory, action of the tumblers. 7 My invention is intended to protect the operating parts-of the lock against derangement owing to wear from long and constant use, and it also results in making'the lock secure against attack by boring a hole along the edge of the plug at the juncture of the tumbler recesses in the plug and the cy]- inder.

' The objects therefore of the present invention are first to prolong the life of the lock,'and' second to add to the security of the lock. 5

With these and other objects in view, my invention consists in the details oiconstruction and combination of parts as will be claims.

" more fully described and pointed out in the A Specification of Letters Patent. Application fi led December 28, 1911 Serial No. 668,277.

Patented Mar. 19, 1912.

In the accompanying drawings, Figure 1.

is a view in longitudinal section of my improved lock; Fig. 2 is a view in transverse section through Fig. 1; Fig. 3 is a similar view showing the plug partly turned and the tumblers and drivers out of alinement; Fig. 4 is a view in elevation of the plug. Fig. 5 is a view 'in elevation of the plug and Fig. 6 asectional view of the cylinder,

showing. blocks having holes for the tumblers, instead of the bushings shown in Figs. 1, 2 and 3.

1 represents the cylinder provided with a cylindrical bore for the plug 2, which latter is cylindrical, and isprovided with a key way 3 extending throughout its len th, and with an enlarged outer end .or 'hea which rests in a counterbored, recess in the cylinder 1, flush or approximately so with the outer face of the cylinder. The plug 2 is provided with a seriesof recesses, the bottom of which are in opencommunication with the top of the key way 3 in the plug, so that when a key is entered in the plugv it will engage the tumblers in the usual and well known 'manner. The recesses in the plug aline with similar recesses in the cylinder,

and the said recesses in both the plug and the cylinder "are linedwith the steel or other hardened metal bushings 4 and 4, thus protecting the'softer metal of the cylinder and plug from the abrading and wearing action of the tumblers 5 and their drivers 6. The bushings 4F in the cylinder-may extend to the tops of the recesses and house the springs 7, "or they may extend a only far enough to 'cover the movements of the drivers, while the bushin s 4 in the plug extend, preferably from t e top of the keyway 3 to the outer surface of the plug so as to meet or join the lower ends of the bushings in the,cylinder.

Instead of providing the plug with a series of recesses each lined with a hard metal" bushing as above de-' scribed, I may insert a steel block 8 in the plug and a similar. block 8 in the cylinder, as shown in Figs. 5 and 6, the two steel blocks, being each provided with a plurality of recesses for the tumblers.

By the use of the bushings or hardened bearings for the tumblers, the life of the lock is prolonged, as the hardened surfaces cylinder and i prevent the wear due to the movements of the tumblers' and drivers against the softer such bushings.

departing from the spirit and scope of my walls of the recesses. The hardened bushings or blocks are a great protection to the security of the lock, as they prevent drilling along the edge of the plug in line with the tumbler recesses, because a drill would be turned aside by these hardenedbushings or blocks. N 0 hole, therefore, could be drilled in the line of the tumbler recesses, which is necessary for that method of attack which endeavors to manipulate the tumblers by a thin piece of steel introduced into said drill holes.

In the drawings I show the bushings fitted to every tumbler recess, but this is not essential, as benefit would result from the fitting of one or more of the recesses with It is evident that many slight changes might be resorted to in the relative arrangement of. parts shown and described without invention. Hence I would have it understood thatI do not wish to confine myself to pin tumblers mounted to move in said bearings.

2. In a-pin tumbler lock, the combination of a cylinder and plug each having alined recesses, a hard metal bushing in each of said recesses, and pin tumblers located. and

moving within said bushings.

3. In a pin tumbler lock, a plug provided with a tumbler recess, and a hardened bushing fitted into said recess.

4. In a pin tumbler lock, a cylinder provided with a tumbler recess, and a hardened bushing fitted into said recess. 1 In testimony whereof, I have signed this specification inthe presence of two subscribing witnesses.

v PETER F. AUGENBRAUN.

Witnesses l SCHUYLER MERRITT, EDITH M. CRoZIER.

30 bearings inserted in both of 'said parts, and v

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