US308885A - Geoege m - Google Patents

Description

(No Model.)

G. M. EAMES 8v F. W. OSTROM.

LOCK.

Patented Dee. 9, 1884.

Unirse Sterns 'Partnr irren.

GEORGE M. EAMES AND FREELAND XV. OSTROM, OF BRIDGEPORCONN. I

LOCK.l

PECIFICATION forming part of Letters Patent No. 308,885, dated December 9, 1884.

Application tiled February 20,1884.

To all whom, t may concern:

Be it known that we, GEORGE M. EAMEs and FREELAND W. OsTRoM, citizens of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Locks; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others- Fig. 2 is a central section transversely to the bolt. Figs. 3 and 5 are central sections with the bolt in elevation, and shown, respectively,

in its thrown and retracted positions. Fig. 6 is a perspective of the spherical cam or tumbler, and Fig. 7 shows the action of the cam in throwing the bolt.

Similar letters indicate like parts in all the figures.

A is the case, preferably cylindrical inform. B is the bolt, C the spring, and D the cam or tumbler. These four parts complete the lock. The entire case is drawn from a single piece of metal, no rivets or lugs being required. To insert the lock it is only necessary to bore a hole in the top of the drawer-front and drop it in.

The case is constructed as follows:

A is a ilange intended to rest in a slight countersink in the top of the drawenfront.

A is a iiange, the interior of which supports the bolt,and the exterior the'spring, and which is made by turning inthe metal from the face ofthe case. The operating-cam is placed at the opposite end of the case and is held in position by closing the metal of the case about it, as at A A, and also by closing the metal of the case into a hole in the cam, as at A. The closing in of the metal of the case is continued a short distance above the cam, the metal be- Vopening or recess, D3.

(No model.)

i ing pressed out at opposite sides to form ways or lbearings A3, which support and guide the flat portion of the bolt. p

The bolt may be struck up or cast, and is preferably made in the form shown in Figs. 2, 3, and 5. The portion B which enters the keeper (not shown) is made round and is supported and guided by [iange A2 upon the case. The lower portion of the bolt B2 is made iiat and fills the entire width of the case. The edges resty in and are guided and supported by bearings Ai. At the junction of the a-t and round portions of the bolt are shoulders B3, against which spring C bears, to force the bolt toits retracted position, the upper lend of the spring being supported by flange A, so that it is impossible for it to move from its open ative position.

The operating cam or tumbler is made Vof metal, glass, or any suitable substance. Itis spherical in form and has a slot, D, extending fronithe periphery down to and past the center, in which the base of the bolt rests when in its retracted position. It will of course be understood that the deeper this slot is cutthe greater will be the throw of the bolt. The metal of the case is closed about the cam in such a manner that it has free oscillatory motion, the aXis of rotation being on a plane horizontal with the base of the slot, but transverse thereto.

In one side of the cani, at the axis of rotation, is an angular opening or recess, D2, with which the key engages.` Corresponding therewith we provide a round openingin the sideof the case, as at AS, at which point the key enters the lock. In the side of the cam, dia-- metrically opposite to recess D?, is a round vInto this recess the metal of the case is closed, as at A, to furnish an additional support and bearing for the cam, thus preventing the slightest lateral movement. A7 is a stop formed by striking in the metal of the case,wliich acts to limit the rotary movement of the cam by engaging the bottoni of the slot. In assembling it is simply necessary to place the spring, bolt, and cam within the case, as shown in Figs. 2 and 5, and then close the metal around the cam, as shown in Figs. l and 4.

The operation is as follows: Suppose the ICO bolt to be in its retracted position, as shown in Figs. 2 and 5, to throw the bolt the keyr is inserted through aperture As into recess D2 in the cam. The cam is turned from left to right, and as the rotation proceeds the bolt is lifted from its position in the slot, as clearly indicated in Fig. 7, until the base of the bolt passes entirely out of the slot and upon the periphery of the cam itself. IVhen'the cam has complcted a half-revolution the base of the bolt will rest on the periphery at its thickest portion, the base of the bolt and the bottom of the slot being parallel, as shown in Fig. 3. Nhen it is attempted Yto continuethe rotation of the cam in this direction, the bottom of the slot will come in contact with stop AT, which prevents its further rotation. Vhen the bolt is retracted, this stop also acts to prevent the cam from being turned in thc opposite direction, the corner ot' the base of the bolt being out away, as at B, to permit it to pass the stop in its descent.

It will be observed that when the bolt `is thrown the base thereof rests iirmly on the periphery of the cam, so that no amount of pressure that could be brought to bear upon the bolt could cause its retraction, that being inipossibleuntil the cam is turned backward. As soon as the cam is turned to the position shown in Fig. 7, thespring will act and instantly carry the bolt to the position shown in Fig. 5.

Having thus described our invention, we claiml. A lock-case having an internal iiange made by turning in metal from the face which supports the outer end of the bolt and the spring, and closed in at opposite sides to form bearings which support the inner end of the bolt.

2. In alock, aspherical operating-cani, held in place by closing the met-al of the case about it, having a slot in which the base ofthe bolt rests when retracted, and which acts when rotated to lift the bolt out of the slot and upon its periphery.

3. The combination, with the bolt and case of a lock, of a spherical operating-cam having a slot, D, and recesses D2 D3, as described, and for the purpose set forth.

4. In a lock, the combination,with the bolt,

spring, and a spherical operating-cam, of a case having an internal iiange which supports both spring and bolt, made by turning in the metal of the case, which is also closed in about the cam to hold the same in place without rivets.

5. The combination, with the bolt, spring, and operating-cam ol' a lock, of a case drawn from a single piece of metal, and having ways which guide the bolt, formed by pressing in the metal of. the case at opposite sides.

6. The spherical operating-cam having a recess for the key, and diametrically opposite thereto a round recess, D, in rcombination with a metallic case closed about the cam, both above and below its axis, and also having a part, A", closed into recess D,whereby the cam is securely held against all movement except rotation on its axis.

In testimony whereof we affix our signatures in presence of two witnesses.

GEORGE M. EAMES. FREELAND V. OSTROM.

Titnessesz A. M. Voosrnn, M. D. BOOTH.

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