US1197444A - Setting-indicator for permutation-locks. - Google Patents

Description

B. s. BURNETT.

SETTING INDICATOR FOR PERMUTATION LOCKS. APPLICATION FILED JAN.24, 1916.

1,197,444. Patented Sept. 5, 1916.

TIL-2.1 /fl TIE; E I /fi 5 20 ififimasm fin l/7Z1" Q 1 2 7 21/6// 15: jar/7627f BUELL S. BURNETT, OF JACKSONVILLE, FLORIDA.

SETTING-INDICATOR FOR PERMUTATION-LOCKS.

Specification of Letters Patent.

Patented Sept. 5, 1916.

Application filed January 24, 1916. Serial No. 73,925.

. To all whom it may concern:

useful Improvements in Setting-Indicators for Permutation-Locks, of which the fol lowing is a specification. c This invention relates to a setting indicator for permutation locks.

The object ofthe invention is to provide a simple and inexpensive device by which a particular combination produced by adjustments of the tumblers can be readily ascertained and the lock parts at the same time held by the device in their operative relation, so that there will be no liability of the adjustment of said parts being disturbed while the numerals of the combination are being ascertained and prior to the final assemblage of the lock.

An embodiment of the invention is shown in the accompanying drawings, wherein Figure 1 is a front elevation of the indicator as in use; F 2 is a rear elevation thereof; Fig. 3 is a central vertical sectional view thereof; and Fig. 4 is a detail perspective view of the indicator as it appears when removed from the lock.

Similar characters of reference designate corresponding parts throughout the several views.

I11 the drawings, the indicator is shown in connection with a lock of the construction disclosed in my co-pending application Serial No. 73,926, but it will be understood that the indicator can be usefully applied to looks of other constructions.

The particular lock construction shown in the drawings embodies a dial plate 1 provided with a beveled dial face 2 and with an operating knob 8 having a reduced shank 4 which provides an annular groove between the head of said knob and said dial plate. The lock tumblers, of which the main tumbler 5 and one of the ring tumblers 6 are shown in the drawing, are controlled by a rotatable stem 7 which extends through the lock casing and is actuated by the dial. The stem 7 at its rear end projects through a slot in the shank of a sliding bolt. This bolt is not shown in the drawings since it must be removed from the base plate 8 against which it is normally held to permit the use of the setting indicator.

The bolt, which is very clearly disclosed in my copending application referred to, has two projections, one of which engages a V-shaped recess 9 in the main tumbler and the other of which engages marginal recesses in the ring tumblers, one of these mar ginal recesses being shown at 10 in Fig. 2. The base 8 has a central opening in which the main tumbler 5 is fitted and a radial extension 11 at one side of this central opening through which the projections of the bolt work for cooperation with the tumblers and through whichthe recesses in the tumblers are visible when the lock is viewed from the rear or outerface of the base plate.

The retraction of the bolt is produced by an operating spring at the time when the marginal recesses 10 of the several ring tumblers are in mutual registry with one another and arein radial alinement with the projections of the bolt and the recess 9 of the main tumbler. The relation of the recesses 9 and 10 to provide for the retraction of the boltis shown in Fig. 2. The lock shown in my co-pending application is so constructed that thepositioning of the ring tumblers to provide for the retraction of the bolt occurs in the order of the arrangement of said tumblers from the base plate toward the dial. In other words, the ring tumbler adjacent the base plate is the first one which is positioned by working the combination to provide for the retraction of the bolt and the other ring tumblers are similarly positioned in successive order.

The setting indicator consists of a member 12 composed of spring metal having a general U-shape in side elevation whereby front and rear arms 13 and 14 are provided. The. front arm 13 has its lower portion formed with downwardly projecting parallel fingers 15 which provide an inverted yoke or fork. The spacing of thesevfingers from one another conforms to the diameter of the shank 4 and their outline conforms to the cross-sectional outline of the dial plate. The arm 13 is provided centrally between the fingers 15 with a downwardly projectingpointer 16 which in the use of the indicator immediately adjoins the margin of the dial plate.

The rear arm 14 is provided with, a sight opening 17 to register with the opening 11 of the base 5 and below said sight opening with an opening 18 through which therear end of the stem 7 projects and whose diameter conforms to the diameter of said stem. The arm 14 is provided at the upper edge of theopening 17 with a depending indicating finger 19 which by its radial alinement or coincidence with the recesses of the tumblers indicates that the tumblers are at such time in position to provide for retraction of the bolt.

The temper of the member 12 is such that in the use of the device, the arms 13 and 11 tend to spring toward one another; and the operative parts of the indicator are so constructed that the indicator will be securely held in operative relation to the look.

In the use of the device, the fork provided by the fingers 15 is fitted over the shank 4 and 'is pushed inwardly until its movement is limited by the dial plate. The fork which the arms 13 and 14: provide straddles the look as shown in Fig. 2, the arm 13 being associated with the dial plate in the manner described and the arm 14 adjoining the rear face of the base 8. The said base has a marginal flange 20 provided with a recess 21 for the head of the bolt. The proper position of the indicator relatively to the lock is provided for by arranging the arm l t in the recess 21, and when so arranged, its opening 18 can be readily fitted over the end of the stem 7 and its indicating finger 19 will be symmetrical to a radial line, bisecting the outer or curved edge of the opening 11 of the base 8.

The use of the indicator presupposes that a change of combination has been made by an adjustment of the tumblers but that the identity of the combination has not been ascertained. When the indicator is fitted in position upon the lock, as described in Fig. 2, the knob 3 is turned to work the combination. A known factor in the working of the combination will be the direction in which the first movement of the dial takes place. The user, viewing the lock from the rear, as in Fig. 2, executes the first movement of the dial, and in the course of this movement, the recess 10 of the tumbler 6 which adjoins the base plate will come into radial line with the finger 19, as shown in Fig. 2. This relation, vlpso facto, indicates the completion of the first movement of the combination and thereupon the user makes a note of the numeral immediately under the pointer 16. The second movement of the dial is then executed and the completion of this second movement is indicated in the same way by the alinement of the'recess of the tumbler next adjoining the one previously set with the finger 19, and thereupon the second numeral of the combination is ascertained in the manner described.

These operations are carried on until all of the tumblers have been moved to and are simultaneously in position to provide for the retraction of the bolt, at which time the combination for which the'lock was set will have been ascertained. Thereupon, the arm the lock is employed, and it is removable from such structure, in unitary fashion, with I the lock. tioned that it in no way interferes with the The wall plate 22 is so proporuse of the setting indicator. This will "be apparent from Fig. 3. On the other hand,

the indicator may obviously beused in the manner shown and described where the look, when removed, does not carry with, it a wall plate or equivalent part.v

It will be understood that the invention is not restricted to the exact form of indicator shown since the construction admits of modification without departure from the essential principles of structure and operation.

I claim 1. A setting indicator for permutation locks having means for its detachable and immovable association with the lock structure, a pointer for'cooperation with the dial and an indicating means for cooperation with the lock tumblers to show the unlocking positions thereof.

2. A setting indicator for permutation locks comprising a member of spring metal formed into U-shape and having a front arm 'and a rear arm, the front arm being formed to fit over the lock operating knob and having a pointer for cooperation with the dial and the rear arm being formed to bear against the lock structure from the rear and to expose the tumblers to view along a line with which certain parts of said tumblers must coincide in the unlocking position thereof.

3. A setting indicator .for permutation locks comprising a member of spring metal formed into U-shape and having a front arm and a rear arm, the front arm having a pointer for coiiperation with the dial and the rear arm being formed to bear against the lock structure from the rear and to expose the tumblers to view along the line with which certain parts of said tumblers must coincide in the unlocking position thereof. I

4. A setting indicator for permutation locks comprisinga member of spring metal formed into U-shape and having a front arm and a rear arm, the front arm having a terminal yoke to fit over the lock operating knob and having a pointer for cooperation with the dial and the rear arm being formed to bear against the lock structure from the rear and having an opening through which In testimony whereof I have hereunto set an element of the lock structure may engage my hand 1n presence of two subscrlbing witas a retainlng means and a sight openlng nesses.

having an indicating finger arranged to co- BUELL S. BURNETT. incide with a line with which certain parts Witnesses:

of the lock tumblers must coincide in the FRANCES SHEPPARD,

unlocking positions of said tumblers. ROBERT R. MILAM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G.

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