AN IMPROVED SAFETY BAR OR STOP ATTACHMENT FOR LIMITING THE MOVEMENT OF DOORS Or THE LIKE
Year: 1884

page_text: COMPLETE SPECIFICATION.
I JOHN HENRY JOHNSON of 47 Lincoln's Inn Fields in the County of Middlesex,
Gentleman do hereby declare the nature of said Invention for AN IMPROVED
SAFETY BAR OR STOP ATTACHMENT FOR LIMITING THE MOVEMENT OF DOORS Or
THE LIKE to be as follows:-
"
This Invention has for its object to provide a loose safety bar or stop attachment
for limiting the motion of doors or for like purposes the said attachment being
very simple in construction and neat in appearance and intended to take the place
of securing chains hitherto in use for limiting the extent to which a door can be
opened and for use for similar purposes to which the said attachment may be
applicable. The bar provided according to this Invention has a projection or ball
at the outer end and is hinged or otherwise articulated at its other end to the
post of the doorway or the like so that in its normal position it hangs vertically
or nearly so-A bolt is fixed to the door or the like to be secured and is capable
of being moved so that its outer end embraces the bar near to its hinged or
articulated end. It follows when the bolt is shot that on moving the door or the
like the bolt moves the bar out horizontally and slips over it until the said bolt
comes into contact with the projection or ball at the end of the bar and thus the
extent to which the door or the like can be opened is limited.
The bolt is provided with a click or catch which secures the said bolt in position.
There may be provided on the projection or ball of the bar a washer or piece of
leather or india rubber or similar soft material which deadens the shock of the
bolt upon the said projection or ball and also the shock of the latter upon the door
post or the like thus preventing noise when the door or the like is opened or
closed.
I will describe the arrangement more particularly with reference to the
accompanying Drawing by which its construction attachment and operation will
be clearly understood.

page_text: Figure 1 of the said Drawing represents the safety bar or stop attachment
constructed or arranged according to this Invention fixed upon a door-Figure 2
is a plan of the same. Figure 3 is a detail illustrating the hinging of the bar and
Figure 4 is a horizontal section of the bolt.
The bar A terminates in a ball a furnished with a washer of leather or of
india rubber or the like and the said bar is hinged at O to a projection or
projections from the plate B fixed to the door post.
The bolt portion consists of a strap or guide slide C fixed to the door in which
the plate or bolt D proper can be slidden it being provided at one end with a
button b by which it can be operated and upon the other end is formed a loop or
forked portion d which when the said bolt is shot forward into the position shewn
by the full lines in the Drawing embraces the bar A near the point of articulation
so that when the door is opened the bar A is raised towards the horizontal position
(see the dotted lines Figures 2 and 3) and the said loop or forked part of the
bolt slides upon the said bar until it reaches the ball a which limits the extent to
which the door can be opened. The movement may be facilitated by shaping the
bar A to an are corresponding to that through which the door moves or by giving
it a play on its joint.
The slide C is provided with a spring catch o which engages in one or other of
the recesses e e¹ for maintaining the bolt in position the said catch constituting an
obstruction which prevents any danger of the accidental displacement of the 'said
bolt by vibration.
.
The parts of the apparatus may be made of any suitable metal or material and
of any convenient forms or dimensions and may be ornamented in any desired way.
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
The safety bar or stop attachment for limiting the movement of doors or the
like the said attachment being constructed or arranged substantially as hereinbefore
described and illustrated by the accompanying Drawings.
Ļated this aun qay of quiy 100%,
JHENRY JOHNSON,
Pr. Ę. G. D.,
47, Lincoln's Inn Fields, London, W.C.