AN IMPROVED DOOR CHECK
Year: 1886

page_text: "
I THOMAS THORNTON of 34 Margaret Street Bury in the County of Lancaster,
Carpenter and Joiner, do hereby declare the nature of my invention for
AN IMPROVED DOOR CHECK" and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
The object of this invention is to check the violent shutting or banging of doors
or gates especially such as are furnished with springs and to cause them to close
gradually and noiselessly.
The invention consists essentially of two parts, namely, an india rubber stop,
and a curved projection or catch-piece, one of which is fastened to the door and
the other to the door frame in such a way that on the door closing the curved
projection comes against the india rubber stop (or vice versa) and compresses it,
forcing it out of shape so as to check the momentum of the door; the india rubber
then exerts itself to regain its former shape and in doing so it allows the curved
projection or catch piece to slide or move slowly past it so as to cause the door to
close gently and noiselessly.
The practical construction of my invention and the manner in which the same
is to be performed will be readily understood on reference to the sheet of
illustrative drawings hereunto annexed and the following explanation thereof.
The modification of my invention shown on the drawings represents the india
rubber stop as applied to the door casing and the curved projection or catch piece
attached to the door but as before mentioned this arrangement may be reversed if
preferred.
Fig. 1. is an elevation of part of a door and casing with my invention shown as
applied thereto in the manner which I consider preferable, a, a being part of the
door, b, b the casing, c, c the curved projection or catch piece, and d, d the india
rubber stop.
In the other figs. (which are drawn full size) the construction and application
of my invention is clearly represented.
Fig. 2. is an end view showing the stop d, d fixed on the casing compressed by
the curved projection or catch piece c, c, fixed on the door, the compression being
caused by the momentum of the door acted upon by the spring. Fig. 3 is a face
view of the stop d, d and Fig. 4. is a plan view of the same.
It consists of an india rubber cylinder d, d placed on a wooden bobbin or
bush e, e through which passes a wire f, f the other end of which is attached to

page_text: the inside of the box g, g which is screwed to the door casing a, a. The end of
the box g g next to the stop d, d is open so that the wire carrying the stop is free
to move in any direction but it is limited from falling below a certain distance by
means of a nut h, h on a screwed pin inside the box.
When the door closes the curved projection c, c comes against the india rubber
stop d, d and compresses it as shown at Fig. 2. The rubber d, d cannot revolve as
it is pressed against the plate g* of the box g but as it exerts itself to regain its
former shape it rises as shown at Fig. 5. and allows the door to close gently.
The curved projection or catch-piece c, c must be made with a polished surface
to allow the india rubber to slide over it, and the speed at which the door is
allowed to close may be regulated by raising or lowering the nut h, h on its
screwed pin, or by altering the angle of the plale g* or the catch piece may be
made with a hinge or pivot as shown at Fig. 6, and provided with a regulating
screw i, i to alter its pitch; or the catch piece c, c may be made in the form shown
at Fig. 7. with a recess k, k into which the rubber falls and as the door is opened
it would require some pressure to open it, which would prevent the door from
being blown open.
In some cases instead of fixing one part of my door check to the door and the
other to the casing as herein before described, the curved projection or catch
piece c, c may be attached to the end of the arm of the spring as shown in section
at Fig. 8, and end view Fig. 9.-1, is the free end of the spring arm, and the
rubber stop d, d is attached to the door by its box g, g the faces x, x of the box
may be vertical or inclined as may be preferred and may be either fixed or cast
solid or adjustable by means of a screw.
The dotted lines in Fig. 8 show the action of the stop and projection on the
closing of the door. The full lines show the relative positions of the same when
the door is opened.
Having now particularly described and ascertained the nature and object of my
said invention, and in what manner the same is to be performed I declare that
what I claim is :-
The combination of a cylindrical rubber stop, with a curved projection or catch
piece constructed and operating substantially in the manner and for the purposes
herein before particularly set forth and illustrated by the drawings annexed.
T
T1 1000