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AM. PHOTO-LITHO. CO. N.Y. (OSBORNE'S PROCESS)

UNITED STATES PATENT OFFICE.

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

LOCK.

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

To dll whom it may concern:

Be it known that I, L. F. Munger, of Rochester, in the county of Monroe and State of New York, have invented a new 5 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 1, 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 section of ditto, taken in the line x, x, of Fig. 1.

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

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 25 is constructed similarly to those of most other locks, the outer portion &amp;, which enters the nosing or recess in the stile or jamb of the casing being thicker than the inner portion so that a shoulder c, is formed on 30 the bolt.

C, represents a series of tumblers xvhich are placed one over the other in the same case A. These tumblers are placed transversely with the bolt B, directly over it and 35 work between the guides a, a, which have each two sides exposed so that they may perform the same: office for both the bolt and the tumblers, see Fig. 1. The tumblers are of skeleton form and each is provided 40 at one side with a recess or slot d, at the side opposite the shoulder c, of the bolt. The loxver ends of the tumblers are made of semi-circular form, and against the upper end of each tumbler a spring e, bears, said 45 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 /, is made and D, is an arbor which 50 is fitted horizontally in the case A. This arbor has a knob E, attached to it at the outer side of the lock. The portion of the arbor xvithin the lock has txvo bits g, Λ, formed on it. These bits project from the 55 arbor at opposite sides but they are in differ ent planes, one g, adjoining the front plate i, of the lock and the other h, adjoining the back plate /, as shoxvn clearly in Fig. 2.

. The lower ends of the tumblers C, at the side have shoulders formed on them, as 60 shown at k, 7c¹, Fig. 1. The bit g, acts alternately against these shoulders, as will be hereinafter referred to, and the bit h, fits or works in the recess or notch /, in the bolt B.

To the bolt B, just at the inner side of the _{6 5}shoulder c, a projection I, is attached. The 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 d.

At the upper end of each tumbler C, and 70 at their outer sides, or sides that are nearest the part b, of the bolt, there is a projection m. These projections work behind a socket F, xvhich is attached to one of the guides a, and is slotted to- receive the key G, xvhich is 75 flat and quite thin. The key has its end notched as shown at a^x, said notches corresponding in depth to the variable position of the notches d, in the tumblers. The slots d, of the tumblers C, are at varying dis- 80 tances in the several tumblers, so. that when they are acted upon by the springs e, only, the slots xvill not register xvith each other.

The operation is as follows: Suppose for instance the lock is in an unlocked state, 85 and the key G, in the socket F, as shown in Fig. 1. In order to throw the bolt B, and lock the lock, the knob E, is turned from right to left, the projection Z, being allowed to pass through the slots d, in consequence 90 of the same being in line, this effect beingdue 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 same direction, viz., from right to 95 left, and the bit g, xvill act against the shoulder 7c¹, of the tumblers C, 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. 100 When the key G, is removed from its socket F, the springs e, throxy down the tumblers C, and the slots d, xvill be thrown out of register and the lock will be in a locked state, as shown in red. 105

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 alloxv the projection I, to pass through them, To effect 110

23,040 . this, the knob E, is turned from right to left and the bit g, will press against the shoulders 7c¹, and elevate the tumblers. The key G, is then inserted in the socket F, the 5 knob E, turned in the reverse direction, viz., from left to right, and the springs e, throw the tumblers down, so that the projections m, of the tumblers will bear against the notched end of the key G, and the slots d, ₁₀ will be made, to register with each other.

The bit A, 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 k, the tumblers 15 C, being raised sufficiently to allow the key G, to be withdrawn. The springs e, throw clown the tumblers C, as soon as the hand is removed from the knob, and the projection 7, of the bolt will be within chambers 20 Z>^x, in the tumblers, the slots. <7, 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 25 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 30 with by burglars, in order to gain a knowledge of the position of the slots d, 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 35 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 40