IMPROVEMENTS IN SPRING HINGES FOR SWING DOORS
Year: 1863

page_text: LETTERS PATENT to Samuel Robinson, of No. 129, Great Brunswick
Street, in the City of Dublin, for the Invention of "IMPROVEMENTS IN
SPRING HINGES FOR SWING DOORS."
Sealed the 7th January 1864, and dated the 7th July 1863.
PROVISIONAL SPECIFICATION left by the said Samuel Robinson at the
Office of the Commissioners of Patents, with his Petition, on the
7th July 1863.
I, SAMUEL ROBINSON, of No. 129, Great Brunswick Street, in the City of
Dublin, do hereby declare the nature of the Invention for "IMPROVEMENTS
IN SPRING HINGES FOR SWING DOORS," to be as follows:-
doors.
This Invention has for its object improvements in spring hinges for swing
In constructing spring hinges for swing doors according to this
Invention; the lower pin or pivot which supports the door, and upon which the
door turns, has fixed upon it an elliptical projection, the pin or pivot being in
the centre of the ellipse. Against the elliptical projection a roller carried by a
slide is constantly pressed forward by means of springs; when the door is
closed the roller rests against a flat side of the ellipse, so that the roller- is at
its nearest point to the pin or pivot on which the door turns, and at this point
a notch is formed in the elliptical projection into which the roller enters and
thus retains the door closed. When, however, the door is pushed either way
the roller will be forced back out of the notch,, and as the door is still further

page_text: turned on its pivot the roller will be forced further back by the portions of the
ellipse that are further from the pin or pivot of the door coming against it.
When the door is released, the roller being pressed forward against the curved
projection causes the door to swing back until the roller enters the notch in
the projection, the lower pin or pivot upon which the door turns and the pro-
jection upon it is received into a case that is to be let into the floor; this case
also contains the roller and slide that carries it, and also the springs that press
the slide forward. It is not essential that the projection on the pivot of the
door should be elliptical, as it may be made of other shape, and still work in
the same manner.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Samuel Robinson in the Great Seal Patent Office on the
7th January 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, SAMUEL
ROBINSON, of No. 129, Great Brunswick Street, in the City of Dublin, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventh day of July, in the year of our Lord One
thousand eight hundred and sixty-three, in the twenty-seventh year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Samuel Robinson, Her special licence that I, the said Samuel Robinson,
my executors, administrators, and assigns, or such others as I, the said Samuel
Robinson, my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times thereafter during the
term therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN SPRING HINGES
FOR SWING DOORS," upon the condition (amongst others) that I, the said
Samuel Robinson, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, should particularly describe
and ascertain the nature of the said Invention, and in what manner the same
was to be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said Samuel Robinson, do hereby declare the
nature of the said Invention, and in what manner. the same is to be performed,

page_text: to be particularly described and ascertained.in and by the following state-
ment thereof, that is to say:
This Invention has for its object improvements in spring hinges for swing
doors. In constructing spring hinges for swing doors according to this
Invention, the lower pin or pivot which supports the door and upon which the
door turns, has fixed upon it an elliptical projection, the pin or pivot being in
the centre of the ellipse. Against the elliptical projection a roller carried by
a slide is constantly pressed forward by means of springs. When the door is
closed the roller rests against a flat side of the ellipse, so that the roller is at
its nearest point to the pin or pivot on which the door turns, and at this point
a notch is formed in the elliptical projection into which the roller enters and
thus retains the door closed. When, however, the door is pushed either way
the roller will be forced back out of the notch, and as the door is still further
turned on its pivot the roller will be forced further back by the portions of the
ellipse that are further from the .pin or pivot of the door coming against it.
When the door is released, the roller being pressed forward against the curved
projection causes the door to swing back until the roller enters the notch in
the projection, the lower pin or pivot upon which the door turns and the pro-
jection upon it is received into a case that is to be let into the floor; this case
also contains the roller and slide that carries it, and also the springs that press
the slide forward. It is not essential that the projection on the pivot of the
door should be elliptical, as it may be made of other shape, and still work in
the same manner.
. And in order that my Invention may be most fully understood, I will proceed
to describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shews a plan view of a case containing a spring hinge constructed in
the manner I prefer for carrying out my Invention, the cover of the case being
removed; and Figure 2 is a transverse section of the same taken through the
centre of the pin or pivot of the hinge; the case of the hinge is, by preference,
let into the floor, as is usual with spring hinges of this description.
a is the pin or pivot of the hinge that turns in bearings in the top and
bottom of the case; the pin a carries as is usual a socket 6, by which the pivot
is connected to the door; c.is an elliptical projection on the pin or pivot, the pin
or pivot being in the centre of the ellipse; d is a roller carried by a slide e that
can move to and fro in guides e', the slide e is constantly pressed forward by
the spiral springs f, so that the roller d constantly presses against the pro-
jection c; c is a recess in the flat side of the elliptical projection, into which

page_text: the roller enters when the door is closed, and thus retains the door closed
with sufficient force. When the door is pushed either way, the roller is first
forced back out of the recess c¹, and is then still further forced back by one or
other end of the elliptical projection. When the door is released the roller d,
being pressed forward by the springs f, presses against the elliptical projection,
thus turning the pivot a until the roller again enters the recess c³.
In witness whereof, I, the said Samuel Robinson, have hereunto set
my hand and seal, this Second day of January, in the year of our Lord
One thousand eight hundred and sixty-four.
SAMUEL ROBINSON. (L.s.)