USRE4674E - Improvement in locks - Google Patents

Description

493.). LYMAN F. MUNGER.

Improvement in Locks. I

'NO. 674 Reissued Dec. 12,187L

gag-1. I f 'O fin q )[nwnlurf be forced back unless the cam is turned;

,manner. 0 (3 U is a series of tumblers,

, outwhen locked.

' sition within the case,

UNITED STATES P T NT OFFICE;

LYMAN F. Minions, or noorrnsrnn, NEW YORK.

IMPROVEMENT IN LOCKS.

Specification forming.part of Letters Patent No. 23,040, dated February 22, 1859; reissue No.'4,67 i, dated December operates thetumblers and lock-bolt with two bits'arranged opposite to each, other and out of the same plane, which operate'in connection :with

' the lock-bolt and tumblers in such a manner that before the bit which throws the lock-bolt leaves the talonnotch of the same the other bit, in turnin g the cam in either directiomraises one or more of the tumblers out ot'comcidence with the stump,

so that, if pressure is applied to the bolt while the key is in the lock, the said lock-bolt cannot The construction and arrangement of parts will hereinafter more fully be described in detail.

In the drawing,'Figure 1 .is a face view of my improved lock with the cover-plate removed, Fig. 2, a cross-section in line m m. Fig. 3 is a top-plan View, showing the key inserted, the lockbolt thrown out.

A represents the case of the lock, and B the bolt", which is thrown, out and in, in the usual lying one over another, bein gpressed down by a series ,of Springs, 6 e e, at the top. in other similar locks, serve "to hold the lock-bolt- The tumblers are provided with notches or recesses d d d, and ithe bolt is provided with a stump or tang, Z. When the tumblers are set to allow the retraction of the bolt these parts coincide or come in line,-and the stump or tang enters the notches, as shown in Fig.1. At other times, when the bolt is protruded and the tumblers distributed or disarranged, the slots (1 d d are out of line, and the stump, striking the edges of the tumblers, prevents the withdrawal of the bolt. In this respect my lock is similar to other'locks in use. The outer edges of the tumblers for a suitable distance on each side of the slots d, and the in Her edge of the stump or tang, are serrated or notched, as shown in Fig. 1. Anarbor or cam, D, is employed for operating the bolt and tum blers, This arbor is a hub set at a suitable poand it has two bits, 9 and h, out of line with each other,

bit 9 acts upon the tumblers to throw them back,

'ofthe stump or tang is These tumblers, as

'- the notch f of the bolt.

asshown. The

and the an. acts upon the bolt. In Fig. 3 ,of the drawing, 9 is shown as striking against shoul der is formed on the tumbler, while h strikes in.-

to a notch, f, in the bolt. This action is produced by the turning -of the arbor in the proper direction.

The gauging or adjusting of the tumblers to bring the notches d d d in line for the entrance produced by the inser tion of a fiat key, G, which has a series of notches or bits, 0. a, which receive bearings m m of the tumblers. These parts so correspond and coincide with each other that the notches d (I. will always come in line when the key is inserted and the tumblers drop on the key; and, since every key isdiii'erent in every look, there is no'danger of opening the loek'by a false key. ment of this kind of key, and its connection with. the tumblers, is also common in other locks, and I lay no claim to it here.

The bits 9 h are arranged o iposite to each other on the cainD, and out of the same plane. The

bits 9 h are so formedthat, before the bit h leaves thetalon-notch of the lock-bolt, the bit g, in turning the cam D in either direction, raises one or more of the tumblers out of coincidence with'the stump I, so that, if pressure is applied to the end of the bolt while the key is notbejorced back. n

It will also be noticed that all the parts, when the key is in place, are entirely under the control of the cam Dg so. that. the lock-bolt can be moved freely in and out by the turning of the said cam.

By the means above described the tumblers are-thrown back so as to be held by the bits or notches upon the key inserted to catch them, and the bolt is also thrown to lock or unlock the door. This action is produced by the single arbor or cam D having the. two bits 9 h.

in the lock, it can- VVhat I claim, and desire to secure by Letters I Patent, is

The cam D, formed with the bits opposite to each other and out of the same plane, and operating in connection with the tumblers c and bolt B, whereby, when the key is inserted and the cam turned in either direction, thebit gwill raise the tumblers before the b t h leaves .Witnesses: L. F. MUNGER.

F. Oseool),

ARom). BAINE. (93) The emplo'yg h arranged I

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