US263244A - Warren h - Google Patents

Description

'.(No Model.) A y WL H. TAYLOR.

PLATE KEY EUR LoKs. 1 No. 263,244. Patented Aug. 22;l 1882i IJNITED STATES PATENTV OFFICE.

WARREN H. TAYLOR, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE LOCK MANUFACTURING COMPANY, OF SAME PLACE.

PLATE-KEY FOR LOCKS.

SPECIIEICATION forming part of LettersPatentiNo. 263,244, dated August 22, 1882.

Application tiled June 22, 1882. (No model.)

` To all whom it may concern Beit known that I, WARREN H. TAYLOR, of Stamford, in the county of VFairtield and State of Connecticut, have' invented a certain new and useful improvement in flat or plate keys for locks having rotary hubs or roll-backs, and also in such hubs, of which the following is a specitication.

With the ordinary flat key there is always more or less difficulty occasioned by the tilting of the key when in place in the hub, caused, for example, by the pressure of the hand or the weight of a bunch of keys on a ring with the at key. This tilting throws the keyout of register or adjustment with respect `to the tumblers, so that sometimes the hub will not turn, or will not turn smoothly. This difficulty has been overcome with respect to plate-keys by theinvention ot corrugated plate-keys, and

by providing corresponding sinuous slots or key-holes in the lock-hubs; but thatinvention, although effective and excellent, and also attended with advantages with respect to prevventin g lock-picking, is not so simple-and easy to manufacture as would be desirable. Hence I have devised my key and a corresponding hub, with the same object of preventing tilting when in place in the lock, and with special referenceto thesimplicityand cheapness of manu` facture of the key and lock-hub. Accordingly I provide a ange or projection upon one side, or it may be upon both sides of the straight edge of my key-blade, extending out at a right angle a suitable distance, and ofsuitablelength, and I also lf rovide"alockhub with a key-slot corresponding in cross-section with the sectional outline ot' the key-blade.

In the accompanying drawings, illustrating my invention, Figure 1 is a longitudinal vertical section of a lock; Fig. 2, a transverse section ofthe same on the line 2 2 of Fig. 1; Fig. 3, a side elevation of my key, and Fig. 4a section of the same on the line 4t 4c of Fig. 3.

A indicates the key-blade, and B the Iiange or projection at one side ot its straight edge and flush therewith; C, the hub; D, the main keyslot therein, and E the side recess for the side flange of the key.

It is obvious that the flange B, when within the side recess, E, of the key-slot, will prevent the key from tilting. The advantages of having the ange B at one side of the straight edge of the key are, rst, thatit can be cheaply and conveniently produced by stamping from a steel plate without causing a corresponding depression on the opposite side of the blade, as would be necessary if the rib were located along the middle of the blade, and it serves materially to strengthen the blade 5. second, the key-slot to accommodate the key can readily be formed in the hub by planing out both -the main slot and the side groove or key-flange recess.

The key-Han ge may be ot' any desirable shape in cross-section suitable to the purpose of the ange. i

I am aware that projections from the sides of the bits of cast keys have been made, and that corresponding key-holes have also been made; but myinvention relates to a dierent species of locks .and a special class of keys, and is designed to be, and practically is, a clear improvement upon the class of locks and keys to which it appertains. I disclaim corrugated plate-keys and side-ribbed bits of cast keys, and the corresponding key-recesses of such keys. Ialso disclaim aplate-key with side ribs, such as shown in the patent of J. Brady, No. 103,837, patented June 7, 1870.

1. An improved plate-key, having the blade A, provided with a flange, B, laterally projecting from its straight edge and flush therewith,

substantially as and for the purpose set forth.

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