US317398A - Philip mathes - Google Patents

Description

(No Model.)

P. MATHES.

LOOK.

No. 317,398. Patented May 5', 1885.

UNITED STATES PATENT OFFICE.

PHILIP MATHES, OF IDLEW'OOD, PENNSYLVANIA,

LOCK.

SPECIFICATION forming part of Letters Patent No. 317,398, dated May 5, 1885.

Applicalionfiled January 7, 1885. (No model.)

To all whom, it may concern: 7

Be it known that I, PHILIP humans, a resident of Idlewood, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Locks; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure l is a plan view of the interior of a door-lock, illustrating my improvement, one of the sides of the lock having been removed. Fig. 2is a similar view of a modification. Fig. 3 is a perspective view of one of the detached parts of Fig. 1. Fig. 4 is a like view of the modified form of this part shown in Fig. 2. Fig. 5 is a side view of the door-latch,(marked A in Figs. 1 and 2.)

My invention relates to an improvement in devices for securing both the keybolt and latch-bolt of a door-lock by a single lever, so that they cannot be retracted without first releasing the lever. \Vhen the lever is operated from the inside of a door, the advantage of such a lock is that it can neither be opened by a false key nor picked from the outside, while the fact that both bolts can be held in a locked position renders the door more difficult to open than if held by only one bolt.

Referring to the drawings, A represents the latch of an ordinary door-lock, operated by a .knob which turns a cam, A, alfixed to the shank of the knob.

B is the key-bolt, which is capable of being shot and retracted by a key inserted through a key-hole, B. The bolt is guarded by a pivoted tumbler, C, which the key must raise before it engages and draws or shoots the bolt.

To the side of the lock-case E at D, above the key-bolt B, is pivoted a lever, D, one end of which projects from the lock-case and is provided with a thumb-piece, D", and the other end extends downward, so that when the lever is turned on its pivot into a vertical position it may rest upon the tumbler, as shown in dotted lines in Fig. 1. This will prevent the raising of the tumbler by means of a key either to lock or unlock the door until the lever is turned back, as shown by full lines in this figure.

The upper face of the tumbler is provided with a stud, 0, against whichthe end of the lever strikes when being turned to lock it. This stud will prevent the turning of the lever farther than is necessary.

The locking of the latch'bolt A is done by the following mechanism: An auxiliary arm, D extends from the locking-lever D, preferably from the axis therefrom, in a proper direction and of such length that when the lever is turned to engage the tumbler the end of the arm D" may rest against a stud or offset, A, on the latch-bolt. Vhen the lever-arm D has thus engaged the stud A the latch cannot be drawn back by rotation of the knob, nor until the lever has been turned from the position shown in dotted lines to that shown in full lines in Fig. 1, thereby disengaging it and the auxiliary arm 1)" from the tumbler C and latchbolt A, respectively.

A modification of my improvement is shown in Fig. 2, in which the lever-arm D is of somewhat different shape, being curved to clear the key-hole B, and, instead of bearing against the tumbler O, bears against the sides of a notch, Z), in the keybolt itself. The lever D, being turned, will engage this notch when the bolt is shot and will prevent its being drawn by the key. The boltB is notched or cutaway forward of the notch b, as at b, so that when the bolt is retracted the lever may be free to turn and engage its arm D" with the latchbolt. The auxiliary arm 1)" in this modification is substantially similar in construction to the arm D (shown in Fig. 1,) and when the thumb-piece is moved forward it will engage the stud A of the latch A and will lock it. The slot 6, through which the end of the lever D projects to the outside of the lock-case, should be made small enough to confine the motion of the lever D within narrow limits. \Vhen the bolts are shot, the lever will be in contact with one of the ends of the slot 0, and cannot therefore be turned out of place by action of the key on the bolt.

The lever D may be provided with a suitable spring, 0, bearing against a cam, d, on the lever, which, when the lever is thrown either to lock or unlock its bolts, will hold itin that position firmly enough to prevent it from jarring out of place.

In a case like that shown in Fig. 2, where lCO the lever D is near the key-hole B, with no intervening mechanism, it is desirable to have a partition, 6 which extends across the lockcase, and removes all direct communication between the key-hole and the lever. YVithout such a device the lock could be easily picked by inserting a tool through the keyhole and pushing the lever forward.

By reference to the drawings it will be clear that the level: D may be used to lock the latchbolt A when shot, while the bolt B is retracted, and may also be used to lock both bolts when shot. The first of these cases is illustrated in Fig. 1 and the latter in Fig. 2 of the drawings.

\Vhen the key-bolt is retracted and the lever turned to look it, the door cannot be locked by a key from the outside.

The configuration of the lever I) may be varied to suit the mechanism of the look. It may be operated by a revoluble button,whieh proj ectslaterally through the 1ock-case,instead of the vertical thumb-piece I)". The button will be found to be desirable when my im provement is applied to mortise-looks, 25 I do not desire to claim,'broadly, a lever mounted in a look so as to engage with the key and latch bolts; but

What I claim as my invention, and desire to secure by Letters Patent, is 0 In a lock, the combination, with the latch bolt A, having a projection, A and the bolt B, having a tumbler, O, of a pivoted lever, D, having a thumb-piece, D and arm D, said lever adapted to engage with the tumbler of 3 5 the bolt and the arm adapted to engage with the projection of the latch-bolt by the movement of the thumb-piece, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set 0 my hand this 27th day of December, A. D.

PHILIP MATHES. WVitnesses:

XV. B. CORWIN, THOMAS W. BAKEWELL.

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