US23040A - photo-litho - Google Patents

Description

nr rc L. F. MUNGER, OF ROCHESTER, NEW YORK.

LOCK.

Specification forming' part of Letters Patent No. 23,040, dated February 22, 1859; Ressued December 12, 1871, No. 4,674. Y

To aZZ whom it may concern:

Be it known that I, L. F. MUNGER, of Rochester, in the county of Monroe and State of N ew York, have invented a new and Improved Lock; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l, is a face or side View of my invention, the side of the case nearest the eye being' removed in order to show my invention. Fig. 2, is a sect-ion of ditto, taken in the line a", m, of Fig. l.

Similar letters of reference indicate corresponding parts in the two gures.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A, represents the case of the `lock which may be of rectangular form.

B, is the bolt which is fitted in the case A, and allowed to slide freely back and forth therein, between guides a. The bolt is constructed similarly to those of most other locks, the cuter portion b, which enters the nosing or recess in the stile or j amb of the casing being thicker than the inner portion so that a shoulder c, is formed on the bolt.

C, represents a series of tumblers which are placed one over the other in the same case A. These tumblers are placed transversely with the bolt B, directly over it and work between the guides a, a, which have each two sides exposed so that they may perform the same oilice for both the bolt and the tumblers, see Fig. 1. The tumblers are of skeleton form and each is provided at one side with a recess or slot CZ, at the side opposite the shoulder c, of the bolt. The lower ends of the tumblers are made of semi-circular form, and against the upper end of each tumbler a spring e, bears, said spring having a tendency to keep the tumblers depressed or pressed down to their fullest extent.

In the lower edge of the bolt B, a recess or notch f, is made and I), is an arbor which is fitted horizontally in the case A. This arbor has a knob E, attached to it at the outer side of the lock. rlhe portion of the arbor within the lock has two bits g, 7L, formed on it. These bits project from the arbor at opposite sides but they are in different planes, one g, adjoining the front plate z', of the lock and the other l1., adjoining the back plate j, as shown clearly in Fig. 2.

The lower ends of the tumblers C, at the side have shoulders formed on them, as shown at 7c, 701, Fig. l. The bit g,'acts alternately against these shoulders, as will be hereinafter referred to, and the bit Zz, fits or works in the recess or notch f, in the bolt B.

To the bolt B, just at the inner side of the shoulder c, a projection Z, is attached. rIhe inner side of this projection is serrated and also the outer sides of the tumblers C, for a short distance each side of the slots cZ.

At the upper end of each tumbler C, and at their outer sides, or sides that are nearest the part Z), of the bolt, there is :a projection m. These projections work behind a socket F, which is attached to one of the guides a, and is slotted to receive the key Gr, which is flat and quite thin. The key has its end notched as shown at a", said notches corresponding in depth to the variable position of the notches d, in the tumblers. The slots CZ, of the tumblers C, are at varying distances in the several tumblers, so that when they are acted upon by the springs e, only, the slots will not register with each other.

The operation is as follows: Suppose for instance the lock is in an unlocked state, and the key Gr, in the socket F, as shown in Fig. l. In order to thro-w the bolt B, and lock the lock, the knob E, is turned from right to left, the projection Z, being allo-wed to pass through the slots CZ, in consequence of the same being in line, this effectbeing due to the insertion of the key G, in the socket F. The bolt B, being shot outward from the case A, the knob E, is still turned in the saine direction, viz., from right to left, and the bit g, will act against the shoulder icl, of the tumblers O, and elevate the same, so that the projections m, -will be raised from the key G, and the latter permitted to be removed from the socket F. When the key G, is removed from its socket F, the springs c, throw down the tumblers O, and the slots cZ, will be thrown out of register and the lock will be in a locked state, as shown in red.

From the above description it will `be, seen that in order to unlock the lock, the slots d, of the tumblers C, must be made to register with each other, in order to allow the projection Z, to pass through them, To effect Y this, the knob E, is turned from right to left and the bit g, will press against the shoulders 761, and elevate the tumblers. The key G, is then inserted in the socket F, the knob E, turned in the reverse direction, viz., from left to right, and the springs e, throw the tumblers down, so that the project-ions m, of the tumblers will bear against the notched end of the key G, and the slots CZ, will be made, to register with each other. The bit L, of the arbor D, then throws the bolt B, in the lock. The knob being still turned in the same direction, the bit g, will press against the shoulders 7c, the tumblers C, being raised sutlieiently to allow the key G, to be withdrawn. rlhe springs c, throw down the tumblers C, as soon as the hand is removed from the knob, and the projection Z, of the bolt will be within chambers bx, in the tumblers, the slots (Z, requiring, of course, to be again brought into register before the bolt B, can be thrown out from the case.

By this arrangement of parts the lock is rendered extremely simple and still all the advantages of the more complicated tumbler locks obtained. The tumblers require to be first raised before the key is inserted, and consequently they cannot be tampered with by burglars, in order to gain a knowledge of the position of the slots cl,

with a view of constructing a suitable key to open the lock.

I am aware that sliding tumblers have been previously used, and also saw plate or thin flat keys, provided with notches of varying depths, corresponding with the varying positions of the slots in the tumblers. I therefore do not claim separately the above parts, but

Having thus described my invention, what l claim as my invention and desire to secure by Letters Patent, is-

The arrangement and combination of the knob E, with the tumblers C, and bolt B; the said knob having studs (g) and (it) out of line with each other; one stud (h) being in line with the bolt, and the other stud (y) being in line with the tumblers; so that when the key Gr is inserted, one of the studs (g) shall pass by the tumblers while the bolt B is shot out by the other stud (71,), and when the key Gr is withdrawn, and the direction of knob E reversed, the stud (g) shall lift the tumblers and thus prevent the picking of the lock by the insertion of a key, all as herein shown and described, for the purpose set forth.

L. F. MUNGER. Witnesses:

WM. C. SToRRs, CYRUS F. PAINE.

[Fmsr PRINTED 1910.]

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