US973455A - Safety-lock. - Google Patents

Description

c.- A. MULLER.

SAFETY Lock. APPLIUTION FILED SEPT. 6, 1907.

Patented 0015.18, 1910.

CARL AUGUST MLLER, OF WITZENI-IAUSEN, GERMANY.

i ya

SAFETY-LOCK.

973,455. Specification of Letters Patent.

Patented Oct. 18, 1910.

"by turning the handle.

Serial No. 391,672. (Model.)

To all whom it may concern:

Be it known that I, CARL AUGUST MLLER, lock manufacturer, a subject of the German Emperor, and resident of Witzenhausen, Germany, have invented an Improved Safety-Lock, of which the following is a specilication.

The object of the present invention is a safety lock in which a key, which can be conveniently placed in a purse, pocket or the like, is used to couple the handle with the roll back and to unlock the handle. This key is made to correspond with a number of tumblers arranged in the lock, which prevent the handle from being connected to the roll-back. After the lock has been locked or unlocked, the key is withdrawn. In the key is an aperture which corresponds' to a projection on the roll-back of the lock. When the key has been pushed down far enough into the lock, the aperture fits over the projection, and the lock can be unlocked To prevent such a lock being unlocked by pins, there are grooves in the cylindrical part of the handle casing in which the pins would catch when the handle is being turned. To prevent the key catching in these grooves it is either provided with noses or is wider than the grooves.

In order that the present invention may be more clearly understood, reference is made to the annexed drawing.

Figure 1 and Fig. 2 show sections on A. A. Fig. 3. Fig. 3 is a front view of the lock. Fig. 4: is an outside view of the lock. Fig. 5 is a section on B. B. Fig. 1. Fig. 6 shows two views of the key.

The bolt a is moved in the known manner by means ofthe projections c on the roll-back b. The roll-hack b can be turned from outside by the handle CZ, when this latter has been pushed sufliciently into the lock e, after a key f with an aperture Zz, has been inserted in the cylindrical part g of the handle cZ, and pushed down by means of a slider e, so that the aperture it in the said key j', coincides with a projection i on the shaft of the roll-back f. In order that the projection z' of the roll-back Z9 will always coincide with the aperture z, in the key, both, when the lock is unlocked and locked, a stop shoulder Za is provided on the lock casing for the projections c of the roll-back b so that the movement of this said roll-back Z9 is limited.

Although the aperture Zt in the key f with a corresponding projection z' on the rollback Z9, which can be of various forms and shapes and sizes, affords a great security against unauthorized operation of the lock, this security can be further increased by the form of the tumbler `Z with which the key f must correspond. These tumblers generally keep t-he handle locked against movement, z'. c. they prevent the handle from forming the necessary coupling, with the projections on the roll-back Z), as they are pressed by springs m into a groove n in the casing 0 around the cylindrical part g, Fig. l. Only when the correct key f is inserted can the tumblers Z of which there may be any number, and whose width corresponds to a cut inthe key f, as shown by dotted lines in Fig. 5; be pressed out of the groove n. The handle Z together with the tumblers Z and the key f, can then be pushed into the lock until the aperture Zt in the key f is passed over the projections' on the roll-back Z). To further prevent the unlocking of the lock, there is a counter groove p in the casing 0 into which the tumblers may be pressed when a false key is being used, so that the handle cannot be pushed into the lock.

In order that when unlocking or locking the lock, to ascertainif the handle is in the correct position opposite the slider c so as to allow the key f to be inserted, there is a spring influenced pin g in the casing 0 which projects into a hollow in the handle `(Fig.

1,) but is released from the handle when y this latter is pushed into the lock (Fig. 2).

` To prevent the handle CZ and the cylindrical part g from being pulled back when they are turned, noses g2 on the cylindrical part g, pass through cuttings in a circular groove g1 in which the said noses turn when key f is pressed into engagement with the roll-back spindle.

The slider after pressing in the key f, is held in a fixed position by means of a spring influenced pin r. After the lock has been locked, the key f is turned by means of the handle CZ, and cylindrical part g, and when these latter are pulled out, the said key f falls into a tray z5 arranged at the bottom of the casing o'and from where the key f can be taken out.

To prevent the insertion of a false key f, this latter possesses a groove u, so that it can pass a pin o in the inserting channel. To obviate the lock shield being unscrewed, two

screws to are passed through the face plate .e and screwed into nuts held to the outer locking shields by means of clamp cheeks y.

rlhe locking of the above described lock is effected in the following` manner The key f is inserted in the insertion channel and pushed down by the slider e. The handle is then released from the tumblers l which are pushed out of their groove n by the key. The handle together with the tumblers and the key is then pushed into the lock and turned in the direction of the arrows, Fig. il, the projections g2 then turning in the grooves g1. After the handle has been turned, it is pulled back together with the parts g, Z, f when the key falls into the tray t, which latter can be pulled into the dotted position shown in Fig. l so that the said key can be taken out.

Having now fully described my invention, what I claim and desire to secure by Letters Patent is An improved safety lock, z'. e. a casing, a roll back situated therein, projections on said roll back, a stop shoulder to limit. the movement of said projections, a projection (t) on the end of the roll-back, a handle a key serving to couple the handle to said roll-back, a cylindrical casing with a sloton top for the insertion otl the key, tumblers in said casing, a slide adapted to force the key into engagement with the tumblers, a spring' controlled pin for holding said slide in position, a cylindrical part carried by the handle, noses on said cylindrical part, said noses being adapted to pass through openings in Ya groove in said cylindrical casing when the handle is pushed in, and a spring controlled pin carried by said cylindrical casing` and adapted to engage in a recess in said cylindrical part, substantially as described and shown.

ln testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CARL AUGUST MLLER.

litnesses M. A. HAASE, RUDOLF Gr. Romina.

Images