An Improved Door Spring.
Year: 1892

page_text: Date of Application, 20th June, 1892
Complete Specification Left, 8th Aug., 1892--Accepted, 17th Sept., 1892
PROVISIONAL SPECIFICATION.
An Improved Door Spring.
We, HARMAN BUNKER, Inventor, and WALTER PECK CHAPMAN, Gentleman
both of the Town of Barrie in the County of Simcoe in the Province of Ontario,
Canada, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to produce a simple cheaply made and effective
door spring and it consists essentially of a wire bent in the form of a long loop the
ends of the wire at the mouth of the loop being bent at substantially right angles
to the legs of the loop one bent end being secured to the door and the other bent
end to the door frame in such a manner that the torsion strain on the legs shall
impart sufficient pressure against the door to close it substantially as hereinafter
more particularly explained.
Figure 1 shows our improved door spring.
Figure 2 shows the spring applied to a door.
Figure 2 only shows a portion of the door A and a portion of the door frame B
in order that the figure can be on a larger scale than would be possible for the whole
door to be exhibited.
C represents the legs of the loop and D the feet which are bent substantially at
right angles to the legs C. The length of the loop formed by the legs C depends
upon the weight of the wire and the torsion strain desired the longer the loop the
weaker the torsion strain in proportion to the weight of the wire.
In applying our spring to the door the toes a of the feet are pointed towards the
door A and twist the feet so that one will lie close to the door A and the other
close to the door frame B. The feet are then securely fastened in position and the
torsion on the legs A caused by the set of the feet A in order to lie against the
door and jam as shown will be sufficient to hold the door closed.
When the door is open the torsion strain on the legs C will increase and when
the door is released the reaction of the torsion strain will immediately close it.
It will of course be understood that the loop must be made sufficiently long to
permit the twisting strain described.
Dated this 20th dox of June 1892.
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicants.
COMPLETE SPECIFICATION.
An Improved Door Spring.
We, HARMAN BUNKER, Inventor, and WALTER PECK CHAPMAN, Gentleman
both of the Town of Barrie in the County of Simcoe in the Province of Ontario,
Canada, 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 :--
The object of the invention is to produce a simple cheaply made and effective
door spring and it consists essentially of an elastic wire with one end fixed to the
door post and the other end to the door the body of the wire between the fixed
points being twisted so that the torsion strain shall be against the door substantially
as hereinafter more particularly explained.

page_text: Referring to the drawings hereunto annexed :-
Figure 1 is a view of a spring with a single leg before being twisted into position
on the door.
Figure 2 is a view of the single leg spring applied to a door.
Figure 3 is a view of a double leg spring as it appears before being twisted
into position on the door.
Figure 4 is a view of the double leg spring applied to the door.
Like letters of reference indicate corresponding parts in each figure.
For the purpose of the Specification we have shown the spring in two forms
which forms may be somewhat altered without changing the principle of the
invention.
In Figure 1 we show the wire formed into a single leg A with a foot B formed
at each end the wire being bent between the leg A and the foot B so as to form
an eye C.
The end of each foot B is set at right angles to the foot forming two sharpened
ends a and b pointing in opposite directions to each other as indicated.
may
In order to apply the spring we drive say-the pointed end a into the door
post D and insert a screw E into the eye e next to the said end. We then twist
the leg A so that the pointed end of the opposite foot shall point towards the
door F and its torsion strain be directed against the said door. The end b
then be driven into the door and securely held in position by inserting a screw G
through the eye c next to the end b and securely screwing it into the door F. In
this way a satisfactory spring is secured which is cheaply made and may be readily
applied.
In Figure 3 we show our door spring made in the form of a loop with the
feet B brought opposite to each other as indicated and the ends a and b pointing
towards each other.
In this form of spring we twist the feet so that the ends a and b shall point
towards the door F and the post D into which they are driven as indicated in
Figure 4 being held in their position by the staples H as indicated or in any other
suitable manner.
In both forms of spring the opening of the door increases the torsion strain on
the wire and when the door is released the reaction of the torsion strain will
immediately close it.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. A. door spring consisting of an elastic wire with one end fixed to the door post
and the other to the door the wire between the fixed points being twisted so that
the torsion strain shall be against the door substantially as and for the purpose
specified.
2. A door spring consisting of a wire leg A with feet B formed on it an end a
formed on one foot and an end on the other an eye C being formed between the
foot B and leg A arranged substantially as shown in Figure 2.
3. A door spring consisting of a wire leg bent in the form of a loop the legs of
the loop having feet at substantially right angles to the legs one foot being secured
to the door and the other foot to the door post substantially as shown in Figure 4.
Dated this 8th day of August 1802
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicants.