Improvements in Safety Chain Fastenings for Doors.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Safety Chain Fastenings for Doors.
I, WILLIAM GREENWOOD of 80 Sewerby Street, Moss Side, Manchester, in the
County of Lancaster, Traveller, do hereby declare the nature of this invention
to be as follows:-
This invention relates to a door chain fastening, which allows the door to be
left safely opened to a certain extent, for ventilation.
In carrying out my invention, I use instead of the slotted plate a bar of brass,
iron, or other suitable metal, worked or cast, so that one end curves upwards,
and the other downwards; affixed to the last named end is a small back plate
with holes for attaching the appliance to the door. I use the ordinary door chain,
excepting that I have a link at the end instead of the usual knob. My method of
working this appliance is as follows:-The end link of the chain is slipped on
the upper curve of the bar and allowed to slide loosely on the straight part. To
further regulate the width of the opening of the door, any of the other links can
be slipped on the lower curve of the bar.
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Improvements in Safety Chain Fastenings for Doors.
I, WILLIAM GREENWOOD, of 80, Sewerby Street, Manchester, in the County of
Lancaster, Traveller do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This invention relates to a safety chain fastening for doors which allows the
door to remain safely open any desired extent for ventilation.
And in order that my invention may be more fully understood I have caused
to be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures, Figs. and 3 being side views of
various forms and Fig. 2 a plan of Fig. 1 of my improved safety chain fastening
shown applied.
In carrying out my invention and referring to the figures generally, instead of
using a slotted plate as hitherto, I employ a bar or rod a formed of brass or other
suitable metal which I secure to the door by means of a bracket or plate and
screws as will be readily understood, or by forming a part thereof with a small
base a', as shown in the drawings, through which screws 6 are passed.

page_text: According to one form of my invention I curve the inner end a² of the said bar
or rod upwards and the outer end a³ downwards, as shown in Figs. 1 and 2.
In connection with the said bar or rod I employ an ordinary door chain c
secured to the door cheek, but having at its free end a link or ring c¹ instead of
a knob, adapted to be slipped over the curved part a² onto the bar or rod a and
slide thereon.
The extent to which the door may then remain open can be varied as may be
desired, by placing one of the links in the middle of the chain c onto the other
curved part 3 of the bar or rod a, as shown in Figs. 1 and 2 in full lines.
Instead of curving the ends of the bar or rod a, as shown in Figs. 1 and 2,
they may be curved in any other suitable fashion which will permit of placing
the said link or ring of the chain onto the bar or rod and prevent same slipping
off accidentally, or the said bar or rod may be formed with suitable heads or
knobs a², a³ for the said purpose, as shown in Fig. 3.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1st. In a safety chain fastening for doors, in combination with the safety
chaine having a link or ring c¹ at its free end, a bar or rod a secured to the door,
adapted to receive and allow the said link or ring to slide thereon, all sub-
stantially as and for the purpose set forth.
2nd. The bar or rod a, specified in the preceding claim, formed at its outer end
with provisions a³ for receiving one of the middle links of the chain c, all sub-
stantially as and for the purpose set forth.
Dated this 9th day of October 1897
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.