US1120816A - Keyhole-lock. - Google Patents

Description

W. P. HYATT & J. W. BROWN.

KEYHOLE LOOK.

APPLIOATION FILED mums, 1914.

1,120,816. Patented Dec. 15,1914.

WP H Y TT W-BRovvN.

THE NORRIS PETERS CO. PHOTO-LITHO.. WASHINGTON. D. C

unrrnn .s'rairns ratrnn'r ca ries.

WILLIAM P. HYATT AND JAMES W. BIEQWN, SACRAMENTO, CALIFORNIA. i

KEY I-IOLE-LOGK.

ments in Keyhole-Locks, of which the following is a specification, reference being had to the accompanying drawings.

guards and has for its primary object to provide a simple and novel safety device of this character which will effectually prevent unauthorized persons from opening the door by means of a pass key and thus obtaining entrance to the apartment.

The invention has for another and more particular object to provide a device of the above character applicable to thekey hole of a common mortise lock, either upon the inner or outer .face of the door and absolutely precludes access to the locking bolt after the door has been closed and locked.

The invention has for a still further object to provide a key hole lock or guard which is positive and reliable in practical use, and may be easily and quickly applied to door locks having key holes of various depths.

With the above and other objects in view as will become apparent as the description proceeds, the invention consists in certain constructions, combinations and arrangements of the parts that we shall hereinafter fully describe and claim.

For a full understanding of the invention,

' reference is to be had to the following description and accompanying drawings, in which Figure 1 is an edge view of a door pro' vided with an ordinary mortise lock showing our improved key hole lock or guard device applied thereto; Fig. 2 is a face view, the key being removed from the key hole guard or locking device; Fig. 3 is an enlarged longitudinal section through the device with'the key nib in its locking position; Fig. 1: is a side elevation partly in section showing the tumbler releasing key locked in the key cylinder; Fig. 5 is a section taken on the line 55 of Fig. 3; Fig. 6 is an elevation, the tumbler retaining sleeve and the spring housing" being removed; Fig. 7 is an" end elevation of the spring housing. r

Referring in detail to the drawings, 5

designates a portion of a door which is pro- I Specification of Letters Patent.

This invention relates to key hole looks or Patented Dec. 15, 1914.

Application filed February 26, 1914. Serial No. 821,249.

vided with an ordinary mortise lock including the locking bolt 6. The escutcheon plate is provided with a key hole indicated at 7,

through which the ordinary pass key is adapted to be inserted for engagement with I the locking bolt. It is the purposeofthe present invention to provide means which will 'eii'ect ually prevent the insertion of a duplicate. key into the key hole from either side of the door after the same has been locked, so that the locking bolt cannot be retracted and the door opened. This device in its preferred, embodiment is con structedsubstantially. in the following manner: A cylindricalbody 8 of steel or other metal is formed upon one end with a longitudinally extending arm 9 preferably of rectangular form in cross section. @pposite' to this arm a longitudinallyextending'opening 10 is eccentrically formed in the body 8.

In this opening,- a metal cylinder 11 is loosely mounted for rotative movement. This cylinder is formed with a longitudinal key slot 12 which is adapted to receive the shank of a paracentric key 13. This key when inserted in said slot is adapted to depress a series of tumbler "pins 14: which are loosely mounted in openings 15 formed in the wall of the cylinder 11." Additional spring pressed pins 16 mounted in the body 8 also project into these openings 15 and bear against the opposed ends of the pins 14. These latter, tumbler pins serve'to lock the cylinder 11 against rotary movement in the body. of the device. The coil springs 17 which are arranged in pin receiving. openings 18 of the body ll are retained in place by means of the metal sleeve 19,arranged upon the body 8. From'reference to Fig. 4, it will be noted that when the key 13 .is

inserted in the slot '12 and the pins 14 ole-1 f I pressed, the cylinderll may be turned to dispose said pins out of alinementwith the pins 16. This turning movement [of the cylinder 11 however, is limited means of a pin or stud 20 projecting fromthe pe riphery of said cylinder at one of its ends which engages with stop. shoulders 21 formed uponthe end of the body 8. These shoulders are so spaced from each other'that the cylinder 11 may be r'otated'for' a distance of ninety degrees. qlnthenormal position of the cylinder 11, the key 13 is securely locked in said cylinder by means of the pins 14. The end of the key is providedwith a suitable opening whereby the same may be readily attached to a key ring, in the manner of an ordinary key. One end of the cylinder 11 is formed with a cylindrical shank 22 raving a reduced portion 23 in the end of which a key nib 2 1 is secured. 25 indicates a sleeve or housing which is telescopically engaged upon the sleeve 19 and carries a screw 26, the inner end of which is engaged in a longitudinalslot 27 formed in the sleeve 19. The closed end of the housing 25 is provided with a slot 28, one end of which is enlarged to receive the cylindrical shank The other end of this slot accommodates the extension 9 on the body 8 which projects therethrough beyond the end of the housing. A. coil spring 29 is arranged upon the shank-22 within the housing 25 and bears at one of its ends against the end wall of said housing and at its other 22 are inserted into the key hole 7. The

projecting end of the rectangular arm 9 is fitted within the lower end port on of the key hole 7 so as to prevent turning movement. of the device upon the door. The key having been inserted into the slot 12 before thickness of the door.

that in order to remove the device t'rom its the device is arranged in. position upon the door lock, the cylinder 11 is then turned or rotated to the extent of ninety degrees so as to dispose the tumbler pins 14: carried by said cylinder in alinement with the pins 16 mounted in the body 8. The key 13 may then be withdrawn as will be readily understood, so that the pins 16 will, upon assuming their normal positions, lock the. cylinder 11 against further rotation, and thus retain the nib 2th in its locking position in the door lock. The end of the housing 25 fits tightly against the face of the escutcheon plate, said spring bearing against the body 8 of the device tends to force the shank 22 outwardly. By the provision of the housing 25 and spring 27, the device may be readily applied to the key holes of locks irrespective of the It will be obvious insert the key in the slot 12 and reverse the.

movement of the cylinder 11, the pins 15 be- I ing moved out of alinement with the pin 16 so that said key islocked in the cylinder in the manner above. explained when the nib 24 is disposed inpositionto be withdrawn from the key hole 7 The device may then be readily attached to the chain ring.

From the foregoing, it is believed that the construction, manner of operation and,

several advantages of our invention. will be clearly and fully understood.

The device is comparatively simple in its construction, may be very easily and quickly applied in its effective locking position and owing to the compact arrangement of the parts, the same may be attached to the key ring and carried in the pocket without causing the user any inconvenience. The several cooperating elements of the invention may be very easily and quickly arranged in assembled position or disassembled when re: pairs thereto are necessary. I

It will of course be obvious that the form and proportions of the several parts may be greatly varied and we therefore reserve the privilege or" resorting to all such legitimate changes as may be fairly embodied within the spirit and scope of the invention as claimed.

Having thusv described the invention, what is claimed is:

1. In a device of the character described, a body member provided with a rectangular arm, a rotatable locking member mounted in said body member and provided with a key shank having a. locking nib, a cylindrical housing for said body member having a slot in one end through which said shank and the arm are disposed, said shank and arm being adapted for insertion into the keyhole of a lock, a key adapted to be engaged with said locking member to rotate the same and dispose said nib in its locking position or in position to be moved out of the keyhole, means for locking the key in connection with said rotatable member when the shank has been withdrawn from the keyhole, and a spring arranged within said housing and bearing against said body member, said spring tending to force the body member outwardly from the keyhole when the device is applied.

2. In a device of the character described, a body, a cylinder rotatably mounted in said body and provided with a longitudinally extending shank having a key nib fixed thereto, a lug projecting from the periphery of said cylinder, spaced shoulders on the body for engagement by said lug to limit the rotation of said cylinder, a housing slidably mounted upon the body, means for limiting the sliding movement of said housing with respect to the body, a coil spring arranged upon said shank bearing against one end of the housing and at its other end against the body, and means for rotating said cylinder to dispose the key nib in its locking position.

3. In a device of the character described, a body provided with a longitudinally extending rectangular arm on one end, a cylinder rotatably mounted in said body and provided with a shank extending in the same direction as said arm, a, key nib fixed to said shank, means for limiting the rotative movebearing at its opposite ends against said body and the end Wall spectively. 1

In testimony whereof We hereunto afiix our signatures in the presence of two Witnesses; v

WILLIAM P. HYATT. JAMES W. BROWN.

Witnesses:

W. A. LATTA,

J. F. Bonus.

Copies of this pate nt may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.

of the housing re-

Images