US103838A - Improvement in locks - Google Patents

Description

waited (t-etre @anni @wird JAMES BRADY, OF BRANFORD, CONNECTICUT, ASSIGi-OR TO THE BRAN- FORD LOCK WORKS, OF SAME PLACE.

Letters Patent No. 103,838, dated June 7, 1870.

IMPROVEMENT IN LOCKS.

The Schedule referred to in these Letters Patent and making part of the same.

the count-yof New Haven and State of Connecticut,.

have invented a new Improvement in Locks; and I do hereby7 declare the following, when taken in con' nection with the accompanying drawings and the letters of, reference marked thereon, to be a full, clear, and vexact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1, a side view of the plate removed;

Figure 2, the principal key;

Figure 3, the master key;

i Figure 4, the operation with the principal key; and 1n Figure 5, the operation-with the master key.

This invention relates to an improvement in locks, the object being the construction and arrangement of the tuxnblers, so that they may be operated `by either, one of two difierently-constructed keys, one of which is a master key; and

It consists in constructing one or more of the tumblers with a double bearing, so that the bit of one key will opemteupon one of the bearings, and the bit of the other key upon the other, both bits raising the tumblers to the same point, `so that the bolt will pass the gate in either position. v

A Yis the bolt, constructed in the usual manner.

B, one tumbler, pivoted at b, and arranged with a gate, a, through which, when the tumblers are raised, a stud, d, on thebolt, will pass, the tumblers falling down ont-o the stud at either side of the gate,

These -tnmblers maybe more or less in number, and

combined in the usual manner for combining tumblers with the lock-boit.

On the tumblers I form two bearings, I 2, either by rebating the tumbler, or by making a projection thereon, so that the bit of one key. will operate against the edge 1 of the tumbler, and the other 'key against the lprojecting or rabbeted edge 2, as seen in figs. 4 and 5,

that in iig. trepresenting the key as having raised the tumbler, bearing upon the tumbler, and that Ain fig. 5fas the other key, bearing against the projection 2. Hence the tumbler is raised to the same point by either of two different and distinct keys. WVhere several tumblers are employed, the projections or edges may be varied, but the projection or edge upon which the master key operates should be the same in all the locks, and the edge upon which the principal key'operates should be different in all such locks,.in order that no two of the-principal keys shall fit the same lock. The variety of keys by such construction, it will be evident, is almost unlimited.

purpose set forth.

' JAMES BRADY.

Witnesses:

A. J. Tnsnrrs, J. H. SHUMWAY.

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