US 881364 A
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Description (OCR text may contain errors)
No. 881,364. r PATBNTED MAR. 1o, 190e.
- D. Y. WHEELER.,
APPLICATION FILED 0013*.2711906.
1HE NoRRls PETERs co., ivAsfHNcroN, n. c.
DANIEL Y. WHEELER, OF DENVER, COLORADO.
FFC i LOCK-GUARD Specification of Letters Patent.
Patented March 10, 1908.
Application filed October 27, 1906. Serial No. 340,929.
To all whom it may concern:
Be it known that I, DANIEL Y. WHEELER, a citizen of the United States of America, residin at Denver, in the county of Denver and tate of Colorado, have invented cer,- tain new and useful Im rovements inLock- Guards, of which the fo owing is a specification.
This invention relates to improvements in lock-guards and has for its object to provide a device which when applied to the lock of a door, will eiiectively prevent unauthorized persons from insertin keys or other instruments in the key hole or the purpose of withdrawin the bolt of the lock and opening the door. attain this object by the means illustrated in the accompanying drawings in the various views of which like parts are similarly designated and in which,
Figure l-represents a vertical sectional view of a door with the device in operative position, Fig. 2 a sectional view of the door showing a top view of the device in operative position, Fig. 3 an end view of the assemled members of the device, Fig. 4--a cross sectional vieW of the key member in the position while being inserted in the lock, Fig. 5-a section along the line 5 5, Figs. 1 and 2, Figs. 6 and 7-respectively side and top views of the key member of the device, and Fig. S-a perspective view of the locking member of the ard.
The device as illustrated in the drawing is composed of three cooperative members, two of which, 6 and 7, will for convenience in description, be termed respectively the key member and the locking member, while the third member 8 consists of an ordinary padlock adapted to secure the first named members in their relative positions.
Member 6, resembling in form the ordinary door key, comprises the stem 8, the bit or web 9 which extends laterally from one of its extremities, and the bow 10 which is composed of two parallel disk-like members 10a, secured at the opposite extremity ofthe stem at ri ht angles to the web and provided with axia ly alined apertures 11.
The locking member 7 consists of a iiat blade 12, provided at one of`its extremities with an integral segmental enlargement or head 13 adapted to be inserted in the s ace 14 between the parallel members 1()et ofp the bow 10, and provided with an aperture 15 which when the head is in its'place between the members of bow 10, registers with the diametrically equal openings 11 in the latter.
Blade 12 of the locking member tapers from its head to its opposite extremity or point, one of its edges 12a being tangent to 1 the circumferential edge of the head while its opposite edge 120, tending toward the cent a portion of' the segmental enlargement, intersects its chordal edge 13a, approximately at ri ht angles.
Having tius described the mechanical construction of the device, the manner of using the same is as follows. After the bolt of the lock 18 has been shot by means of the key intended for the purpose, the latter is Withdrawn from the lock and the key member 6 inserted therein through the key hole 16, as shown in Fig. 4, in which 17 designates the door and A19 the escutcheons secured thereto. The stem 8 of the key member is now turned in the eye 16 of the keyhole until its biurcated bow extends in parallel relation and the web or bit 9 in consequence at right angles to the latter. The pointed extremity of the locking member is subsequently inserted in the slot 16C of the keyhole with the edge 12a extending longitudinally along the lower side of the stem 8, until the head 13 has reached the osition in between the diametrically equa members 10,a of the bow and the apertures 11 and 15 are in register. The bow 8a of the padlock 8 is finally passed through the registered apertures 11 and 15 for the purpose of locking the members 7 and 8 of the device in their relative positions, as illustrated in Figs. 3 and 1.
. The device thus secured, effectively bars access to the lock by obstructing the keyhole, while the position of the web at right angles to the slot 16C prevents withdrawal of the key member 6 and the position of the blade through the said slot prohibits turning the latter in the eye 16a.
The contrivance as described is particularly adapted for use in hotels and other public places, as during temporary absence of the occupant of a room, it prevents employees or dishonestly inclined persons to gain access thereto by the use of either du licate and skeleton keys or nippers.
aving thus described my invention what I claim is A guard for preventing the insertion oi keys in key holes, compr1sing a*pair of indel S l of the first member in a plane at right angles to the plane of the bit and into the keyl'lole, said head portions having alining openings for the insertion of' a looking member to prevent their disengagement, substantially as described.
In testimony whereof I have affixed my ignature in presence of two witnesses.
DANIEL Y. IHEEL'ICR. Witnesses K. M. STUMP, G. J. ROLLANDET.