US252336A - Removable permutation-lock - Google Patents

Description

(Model.)

R, W. T HURMAN. REMOVABLE PBRMU'TATION LOCK.

. Patented J an. 1,7, 1882;.

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ROBERT THURMAN, OF LYNGHBURG, VIRGINIA.

REMovVABLE PERM UTATIoNLocK.

.SPECIFICATION forming part of Letters Patent No. 252,336, dated January I7, 1882,

Application tiled November 17, 1881. (Model.) 4

To all whom it may concern:

Be it known that I, ROBERT W. THURMAN,

`a citizen of the United States of America, re-

siding at Lynchburg, in the county of Campt of this specification.

-sponding parts.

My invention consists in so constructing the locks of safe, vault, and similar doors thatl in case of accident the lock can he removed and the'door opened without injur to either door or lock, avoiding the expense, delay, and inconvenience incidental to the present method of opening doors having combination-locks when the same are out of order.

In the accompanying drawings, Figure l. is ai front view of a portion of a safe-door showing the application of my device. Fig. 2 is a vertical longitudinal section on the line 2 2,Fig. 1. Fig. 3 is a sectional view on the Iine33ot'Fig-2.

Similar letters of reference indicate carre In the drawings, A represents a cylindrical shell or case, of metal, constructed in two portions secured together, thc front portion being larger in diameter than the rear. Each of the portions contains a separateand distinct permutation-lock, N and O, of any known style having circular tumblers. The spindles of both these locks are brought to the front end of the ease, the spindle I) of the front or secondary lock, N, being made hollow to permit the spindie B of thc rear lock to be operated through it as though it. were not there.

On the outer end of spindle B is the ordinary dial-plate, D, operated as usual underneath. Concealed by the dial D is a smaller dial, C, for operating the secondary lock N, which is unaffected by the ordinaryoperation of lock There is a sot, F, in the case A, extending as far forward as the last of the second set of tnmblers, and ot' the same width as the notches in the tnmblers. This slot may be made in two portions in dierent parts ofthe case, but

is preferably placed as shown, and is for the purpose of receiving in its larger and deeper part the teeth of the rack, hereinafter described, by means of which the case A, containing the locks, is secured in the door, and in its smaller and inside portion the end of the door-bolts when thrown back to open the door.

The part H is solid metal, its quality depending upon the thickness of the door, its presence being to afford security against drilling.

rlhe cylinder E is preferably constructed of steel, and is formed `with a flange, e, on its inner end, by which it is secured to the door. On the inside of cylinder E is secured iii any position, but preferably as near the inner end as possible, a toothed rack, j', the teeth g ot' which are tted to engage with the' tumblers h of the secondary lock N.

A safe, vault, or other door has an aperture to receive the cylinder E, whichis placed there- :in and secured by the tlange c, or any other suitable manner. AThe tumblers h 'i being arranged with their notches in line with the slot F, the teeth g and the end of the door-bolt will pass along the slot F, and the case A can be inserted within the cylinder E. When in position the case A is secured by (logging the tuinblers ofthe secondary lock N by the teeth y, as shown, using the inside dial, which does not move except to operate the secondary lock. The outer dial is removed and replaced by use of screw g'.

lt` will be seen from the foregoing that the lock N is only to be used should the ordinary lock, 0, fail to operate. Then, by means ofthe slot F and teeth g, the whole device can be withdrawn from the door. The liability of the secondary lock to become deranged is very slight, as in ordinary cases it will be so seldom required. The door-bolts should work into the inner end of slotJ F, which is controlled by the lock O, having the ordinary external dial-plate. The form of case shown permits the use of bolts of the usual form ot' construction with slight moditications.

IOO

` h, and dial C, substantially as shown and described.

2. A removable lock having an independent set of tumblers adapted to register with teeth secured to the door, whereby the whole may be removed Without operating the combination of the main lock, substantially as shown and described.

3. In combination with the lock O, the cylinder E, provided with teeth g, adapted to register with the tumbiers of an independent lock, whereby the locks are detachably secured in the door, substantially as shownr and'deseribed.`

4. In combination with the lock N, having a cylindrical slotted case, spindle b, and dial 15 C, the toothed cylinder E, substantially as shown and described.

In testimony whereof I have aiXed my signature in presence of two witnesses.

ROBERT W` THURMAN.

Witnesses: l

JOSEPH GARNEY, G. R. LYMAN.

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