Improvements in Door Chains.
Year: 1891

page_text: Date of Application, 21st Oct., 1891
Complete Specification Left, 19th Aug., 1892-Accepted, 21st Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in Door Chains.
I WILLIAM GEORGE GOOCH of 42. Wyndcliffe Road- Small Heath in the.
County of Warwick Manager do hereby declare the nature. of. my, said invention.
to be as follows:-
My invention has for its object improvements in door chains by which means I
make such chain bolts adjustable and self locking so that in whatever position the
chain may be placed the door to which it may be attached can only be opened the
distance required while the greater the pressure upon the door the tighter the chain
becomes locked in the slide. thus forming a most.reliable and efficient chain bolt and.
allowing the door to be locked in a more or less open position or in case of the..
chain being carelessly inserted in the slide.it becomes self locked in that position as
soon as any pressure is brought to bear upon the door. For bedrooms where the
regulation of the amount of opening is desirable such bolts are particularly
applicable but their application to all classes of doors is obvious.
In carrying my invention into effect I provide an ordinary shaped slide except
that I may prefer in manufacturing it to draw it.by which means the edges of the
slot are more perfectly true while the cost of manufacture is. reduced. This slide ist
attached to the door in the ordinary position as is also the chain to the door post
but upon the loose end of the chain in place of the ordinary, button end I provide
the following..
To the end link of the chain one end of a lever is attached upon a pivot the other
end of the lever forming a disc having an .incline. formed around its one face & a
circular hole in the centre which forms a bearing for the pivot upon which it turns
at the one end of this pivot a square is formed upon which a second disc is mounted
this disc having around its face a similar incline to the one upon the disc. to which
the lever, is attached. To the other end of the pivot, a button. is attached of
suitable shape for insertion in the hole at the end of the slide but the disc: being.
slightly larger than the hole the button. passes into the slide while the disc remains
outside & while the cam faces of the disc are arranged to fit sufficient space: is
provided between the button. & the lever disc for the intermediate edges of the slot.
upon which it then easily slidės but upon the chain being pulled the lever is drawn
in a direction to cause the two inclines to press: the disc tightly against the outside
edges of the slot & drawing the button against the inside edges thereby wedging.
and locking the arrangement in any position it may be in when the chain may be
pulled.
I'may so shape the hole and button that the button can only be inserted in
one position ie, that position in which the lever is correctly placed for action & I
may so arrange a weak spring in connection with the discs which would retain them
in an unlocked .condition except when the arrangement was wedged. & locked in
which case the spring, would be overpowered for the time being, & the bolt, would
remain locked 'as before..
Dated this 20th day of October 1891..

page_text: COMPLETE SPECIFICATION.
Improvements in Door Chains.
I WILLIAM GEORGE GOOCH of 42 Windcliffe Road Small Heath Birmingham
in the County of Warwick Manager 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:-
My invention has for its object improvements in door chains by which means I
make such chain bolts adjustable and self locking so that in whatever position the
chain may be placed the door to which it may be attached can only be opened the
distance required while the greater the pressure upon the door the tighter the chain
becomes locked in the slide thus forming a most reliable and efficient chain bolt and
allowing the door to be locked in a more or less open position or in case of the chain
being carelessly inserted in the slide it becomes self locked in that position as soon as
any pressure is brought to bear upon the door.
For bedrooms where the regulation of the amount of opening is desirable such
bolts are particularly applicable but their application to all classes of doors is
obvious.
In order that my invention may be clearly understood and more easily carried
into practice I have appended hereunto a sheet of drawings upon which I have fully
illustrated the nature of my said improvement.
Figure 1 is a general front elevation of my door chain complete.
Figure 2 is a sectional elevation through the sliding bolt.
Figure 3 is an elevation and section of the lever B of the sliding bolt.
Figure 4 is a section and elevation of the inclined disc C.
Figure 5 shews section and elevation of the pivot pin E.
Figure 6 shews elevation of the collar D.
Figure 7 shews elevations of the pivot pin A.
Figure 8 is a vertical section through the slide.
In carrying my invention into effect I provide an ordinary shaped slide H except
that I may prefer in manufacturing it to draw it by which means the edges of the
slide G are more perfectly true while the cost of the manufacture is reduced.
This slide is attached to the door in the ordinary position as is also the chain to
the door post but upon the loose end of the chain in place of the ordinary button
end I provide the following. To the end link of the chain I one end of the lever B
is attached upon the pivot A the other end of the lever forming the disc b¹ and
being provided with the inclined face and also having a circular hole 63 which
forms a bearing for the pivot E upon which it turns.
At the one end of the pivot pin the square sides are formed and upon this
square the disc is mounted which disc C has a similar incline C¹ on its face to that
on the line B. The pivot pin E is provided with the head this being inserted in
the circular hole at the end of the slide but the disc B being slightly larger than
the hole the button passes into the slide while the disc remains on the outer side
of the slide. When the two can faces of the disc fit sufficient space is provided
between the head E and lever B for the button or bolt to slide along the groove in
an easy manner but immediately the lever B is operated in the direction of the
arrow, the cam faces operate against each other separating the discs B and C and
consequently gripping the slide firmly between the head E and lever B.
I may so shape the hole and button that the button can only be inserted in one
position i.e. that position in which the lever is correctly placed for action and I may
so arrange a weak spring in connection with the discs which would retain them in
an unlocked condition except when the arrangement was wedged and locked in
which case the spring would be overpowered for the time being & the bolt would
remain locked as before.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
The improvements in door chains consisting of a button or bolt end having an
inclined face or faces operated substantially as and for the purpose herein set forth
and shewn upon the accompanying drawing.
Dated this 31st September 1892.
WILLIAM GEORGE GOOCH.