US907318A - Lock. - Google Patents

Description

W. CURLBTT.

LOCK.

APPLIQATIOI rILnn ma. 5. 190a.

Patented Dec. 22, 1908.

' MAW- me 0pm: PETERS 50., wunmmau, n. c

PATENT oE ioE.

WILLIAM CURLETT, OF SAN FRANCISCO, CALIFORNIA.

LOCK.

Specification of Letters Patent.

Patented Dec. 22, 1908.

Application filed August 5, 1908. Serial No. 447,047.

To all whom it may concern: I

Be it known that I, WILLIAM CURLETT, citizen of the United States, residing at San Francisco, in the county of San li'rancisco and State of California, have invented new and useful Improvements in Locks, of which the following is a specification.

My invention relates to looks; and it has for its object to provide in a lock, simple, inexpensive and easily applied means, adapted to be manipulated by the key complementary to the lock and when so manipulated to cover and guard the keyholes, this with a view of preventing the introduction of a lock picking instrument into the lock and of rendering it impossible for any one to peep through the keyholes.

The invention will be fully understood from the following description and claims when the same are read in connection with the drawings, accompanying and forming part of this specification, in which:

Figure 1 is a sectional view of so much of a look as is necessary to illustrate my invention; the same being taken in a plane at the inner side of the lock bolt, looking outwardly. Fig. 2 is a transverse section of the portion of the lock. Fig. 3 is a detail section, taken in a. plane at the inner side of the inner disk comprised in my im rovements.

Similar letters d esignate corresponding parts in all of the views of the drawings, referringto which:

A is a portion of a door.

B is an escutcheon on the inner side of the door, equipped with a stop C, for a purpose presently set forth, and D is a lock casing arranged in the door in the ordinary well known manner. The said casing D is provided in its inner side wall a with a keyhole b, and in its outer side wall 0 with an alined keyhole d; and it is also provided on the inner side of its inner side wall a with key guides e, and in said inner side with a circular countersink f, which countersink preferably communicates with an opening 9 in the bottom wall of the casing for a purpose which will presently appear. In the inner side of the outer side wall a of the casing is provided a circular countersink h which is preferably smaller than the countersink f in about the proportion illustrated. It will also be observed by reference to Fig. 3 that the countersink f in the casing wall a communicates with an opening tin the front wall of the casing; the said opening i casing walls.

and the before mentioned opening 9 being designed to hold against lateral deflection or displacement the inner disk hereinafter described.

E is the key complementary to the lock. The said key is preferably of the ordinary, well known construction, with the exception that it is provided on its stem j with a projection 7c designed to bring up against the before mentioned stop C on the escutcheon B in the manner and for the purpose hereinafter described.

F is the outer revoluble disk of my improvements, and G is the inner revoluble disk thereof. The outer disk F is arranged and adapted to turn in the countersink h in the outer casing wall 0, and is held against lateral deflection by virtue of its interposition between said casing wall and thelock bolt H. It is provided at l with a keyhole corresponding in shape and size to the keyholes in the The disk G is countersunk at m to enable it to turn without interference from the before mentioned key guides c, and is provided with a keyhole, Fig. 3, which also corresponds in shape and size to the keyholes in the walls of the lock casing. Said disk G is adapted to turn in the countersink f and in the openings 9 and i of the casing, and it will be observed that in addition to holding the disk against lateral movement the said openings g and i afford bearings which contribute to the facility with which the disk may be turned.

In the practical use of my improvements, when the door is locked from the outside the key is. turned around to its initial position and may then be withdrawn in the usual manner without closing the keyhole by the guard plate. When, however, the door is locked from the inside it will be observed that the projection k on the key stem will bring up against the stop C on the inner escutcheon B after the key has been turned through about three-quarters of a revolution-i. e., sufficiently far to shoot the bolt II to an extent necessary to lock the door. Inasmuch as the key rests in the keyholes of the disks F and G, it will be noted that the said turning of the key will be attended by turning of the disks, and consequently when the key is stopped as stated, the disks will cover both ke holes of the lock casing and render it absoutely impossible to introduce into the lock casing a lock-picking instrument, and at the same time will preclude an outsider seeing into the room through the keyhole.

It will be gathered from the foregoing that in addition to the practical advantages hereinbefore ascribed to my improvements, the same are advantageous because their application entails but little increase in the cost of producing the lock; the lock casing being adapted to be cast with the countersinks f and h and the openings 9 and i, and the disks F and G being adapted to be stamped from' suitable metal.

When deemed desirable, the two disks may be connected through the medium of a piece it, this in order to enable the disks to turn uniformly together.

It will further be gathered from the foregoing that the disks are made double so that the lock may, in the usual way, be ap lied to a left-hand door or a right-hand oor by simply changing the bolt.

The construction herein illustrated and described constitutes the best practical embodiment of my invention of which I am cognizant, but it is obvious that in the future practice of the invention such changes in the form, construction and relative arrangement of parts may be made as fairly fall within the scope of my invention as defined in the claims appended.

Having described my invention, what I claim and desire to secure by Letters-Patent, is:

1. In a lock, the combination with-a casing having inner and outer walls in which are keyholes, of inner and outer disks, arranged to turn in the casing and having keyholes alined with each other and adapted to register with the keyholes in the casing and receive a key.

2. In a lock, the combination with a casing having inner and outer walls in which are keyholes and also having circular countersinks in the inner sides of said walls, and a bolt mounted in the casing and adapted to be moved by a key placed in the keyholes, of inner and outer revoluble disks, arranged in the countersinks and between the casing walls and the bolt and having keyholes alined with each other and adapted to register with the keyholes in the casing and receive a key.

3. In a lock, the combination with 2. casing having inner and outer walls in which are keyholes, and also having circular countersinks in the inner sides of said walls and openings in its bottom and back walls 'in communication with the inner countersink, and a bolt mounted in the casing and adapted to be moved by a key placed in the keyholes,

, of an inner revoluble disk arranged in the inner countersink and the openings of the casing at one side of the bolt, and an outer revoluble disk, arranged in the outer countersink at the opposite side of the bolt; the said disks having keyholes alined with each other and adapted to register with the keyholes in the casing and receive the key.

4. In a lock, the combination with a casing having inner and outer walls .in which are keyholes, and a stop fixed with respect to the casing, of inner and outer disks, arranged to turn in the casing and having keyholes alined with each other and adapted to register with the keyholes in the casing, and a key complementary to the lock; said key having on its stem a projection adapted to cooperate with the fixed stop, for the pur ose set forth.

In testimony whereof have hereunto set my hand in presence of two subscribing witnesses.

WILLIAM CURLETT. Witnesses P. H. PIoDA, EDITH W. BURNHAM.

Images