US1667508A - Key fastener - Google Patents

Description

April 24, 1928.

S. F. BUNKER KEY FASTENER Filed March '7. 1927 I am giga/dief? "WJ T i Patented Apr.y 24, *1912s.y Y

v finir' FASTBNBR? application al'eu iraient 7, 1921. `aerial 1w., maint. f

I The object of my invention ist@r provide a simplel andi effective: devicewhichl may be conveniently carried in a pocket, and used" inv connections with vd'oor. knobs and locker of varibus kinds to prevent the` :key vofpthe'4 d"oor,` when locked@ on? the; inside, from: being turned or thrust out of the l'oekby'amothe'ni keyf or instrument;insertedfrom the outside. In particular, the object of my invention is to so form and arrange the key fastener that it may be very cheaply constructed and' easily snapped into place by a simple movement, andwhen properly positioned within' the loop of the key handle will prevent tampering with the key.

In the drawing:

Fior. l is a perspective View of my key fastener in connection with 'the door knob and key of the usual type;

Fig. 2 is a face view ofthe door plate and knob partially in section to better show the fastener in place, and illustrating in dotted lines the position assumed by the fastener before its insertion into the key;

and

Figs. 3, 4f and 5 fastener. y y

he fastener, as illustrated inFigsl and 2, is applied 'to the shank A of a door knob B which extends outwardly from a door plate C in which is a, key hole D.' The key E extends outwardly from the keyhole and presents its handle F iniatwise relation to are modified forms of the the door-knob, which is the` position sumed by the key when'in locked relation.

In order to prevent the key from being withdrawn, it is necessary vto prevent it from being turned into edgewise relation to the knob, and the fastener of the present invention is designed to prevent such turning.

The fastener is in the'form of a spring loop G which comprises side members H which converge downwardly toward the reversely bent end I which is of U-shaped formation. The sides are outwardly bowed or bulged at oppositely disposed intermediate points J, and thence bentinwardly toward one another to afford contracted neck portions K, above which the terminal portions L of the side members are backwardly bent to give the open upper end of the fastener a flaring mouth portion, and the ends terminate in inwardly bent lips M. Thisk gives to the entire fastener 'the exterior configuration of an arrow head tapering to a close point and @Pen @tits has@ with en interina-.-v

diat-e neck or contraction where the body of the fastener merges into the base.;

i. As' shown ini Figs.; lr andr; the yfnsteneris formedpofraffltlt" strip of met-aid bent tothe intended?configuration; In;v Fig', the? saine configuration isf secured by stamping the i fastener@frtunv a fiat sheet of metalto afford zu fiatten'frsdd-and?v closed tipfendI N from which the Vsidefmembers extend, being twisted at the points() to present themselves in edgewise relation to the general plane of the fastener. Y

Fig. et shows a similarly configured fastener formed of round wire. `Fig. 5 shows a yfastener stamped from a sheet or plate of 'fiat metal, but without the twisting at the lpoints O which characterize the fastener of Fig. 3.

In using the fastener, the same will first vbe slipped onto the shank of a door knob by bringing the lips of the open mouth of the fastener into register with the sides of the shank, after which an endwise thrust will cause the terminal portions of the Vshank to spread anda continued lthrust will force the fastener :past the contracted neck portion until itl assumes the position indicated in dottedv lines in Fig.v 2. In this posi-l l tion, the bod portion of the fastener will embrace the ffbor knob shank which lifts the fastener sufficiently, so that it may be swung down into alignment with the aperture in the door key, but' with the tipY end of the:

fastener elevated above the aperture to afford the necessary clearance. A Y

' With the fastener thus aligned, a down-l Ward pressure against the upper end of the fastener will force the fastener along the door knob shank past vthe contracted neck portion and until the door knob shank is enibraced yby the fla'ring'terminal portions, as indicated in full` lines in Fig. 2. With the parts in this position, the key' will be held against turning, and, at the same time, the fastener will be held under spring pressure in position around the door knob shank, being held in place the inwardly converg4 ing loop portions. f

In order to remove the fastener from the door knob, it is firstthrust upwardly a sufciently to permit the neck and the lips to free themselves from the door knob. t

The invention is one which may be positiened or removed by 2y vfilnple thrust or pull, as the case may be, and yet affords suificient spring tension to iirrnly grip the door Vknob shank whenin place and thus prevent accidental displacen'ient. At the saine time, the provision of the contracted neck in conjunction with the inturned lips lirinly positions the key bolder at a definite point on the door knob, so that a tight lit is insured and rattling or inaladjustinent prevented.

I claim: l

l. A key fastener in the Yforni ol an open ended loop of spring` material configured `to al'i'ord a tapered closed tip end merging into side sections bowed outwardly in opposition to one another and inwardly toafford re* duced neck portions, the side sections beyond the neck portions being backwardly lared away from one another to the degree required to embrace the sha-nk of a door knob, lsu bstantially as described.

` 2. A key fastener in the forin oi' an Open ended loop of spring inaterial contigui-ed to aifi'ord a tapered closed tip end merging into side sections bowedv outwardly in opposition to one another and inwardly to afford reduced neck portions, the side sections beyond the neck portions being backwardly -flared away from one another to the degree required to embrace the` shank of a door knob, and the tip ends being inwardlyvbent to atford'opp'ositely disposed lips, Substanf tially as described. t

' SAMUEL EBUNKER.

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