Improvements in Self-closing Mechanism for Doors.
Year: 1899

page_text: Date of Application, 25th Nov., 1899-Accepted, 20th Jan., 1900
COMPLETE SPECIFICATION.
Improvements in Self-closing Mechanism for Doors.
We, JOHN KELLY and THOMAS KELLY, of 113, Rose Street, Edinburgh, Scotland,
do hereby declare the nature of our invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the follow-
ing statement;-
Our invention relates to improvements in self closing mechanism for doors
whereby certain advantages are obtained.
In order to render our invention clearer we have appended a sheet of drawings
illustrating our invention in which Figure 1 is a plan while Figures 2, 3 and 4
are details of the mechanism.
The drawings illustrate our invention as applied to a door opening both ways
In the drawings A A A² is an outer metal casing formed of three sides as shown
capable of being bedded in the floor and so constructed that the inner casing BB'
B B3, within which is the closing mechanism, can be taken out therefrom with-
out removing the outer casing from the floor. The sides A and A2 of the casing
are bent round at a and a¹ so as to practically form a junction with the remaining
side of the square which is formed by the side B³ of the inner casing.
The inner and outer casings are secured to each other by the cross bars b and b
which are flush with the bottom of the outer casing to which they are rivetted
or otherwise attached and upon these is secured the inner casing.
In order to secure the casings to the floor lugs and are formed upon the
sides B and B of the inner casing.
The lugs serve for holding bolts attached direct to the floor while the lugs ¹
serve the double purpose of securing the two casings together and also of attaching
the casings to the floor by the passage of the bolts through the lugs and cross
bar b¹.
Within the inner casing and attached thereto are the two composite springs C
and C which are firmly held to the sides B and B by means of the corner pieces i
and ¹. At the outer extremities of the springs are the links cc which in turn
are connected with the levers DD.
The levers DD are pivoted at dd'-the pivots being carried at the bottom by
the cross bar 1 and at the top by a plate J.-and are placed one above the other.
To the ends of these levers are linked the chains E and E which are, as in the
case of the levers, one above the other. Lugs are formed upon the levers D
and D and also at the ends of the springs C and C¹ and to these the links cc
are attached.
The above mentioned chains are secured to the cams F and F¹ one of which
is shown in plan and section in Figures 3 and 4. Each cam, the form of which
is shown in Figure 3, is free to work upon the spindle G, shown on a large
scale in Figure 2 and is provided with a race for fi in which works the vertical
arms or stops and g¹ of the cross piece H itself an integral part of the spindle G.
The upper extremity of the spindle G is squared to take the head of the metal.
bar J shown dotted in Figure 1. This bar carries the door to which it is secured
by screws or other suitable method of attachment,

page_text: Each cam is provided with a projection-k which abuts against the projecting
corner pieces i and ¹.
Over the top of both casings is fixed a metal cover usually made in two halves.
The half covering the cams has a bearing through which the spindle G projects.
The action of our invention is evident for supposing that the bar J carrying
the door is moved to the right the vertical arm or stop g abuts against the end f¹
of the race and causes the cam F to revolve, this in turn acting through the
chain E actuates the lever D and link c compressing the spring C. Upon the
door being released the spring reacts through link, lever, chain and cam and the
door springs back to its normal position.. Should the door be moved in the oppo-
site direction the other cam Fi with its accompanying chain, lever, link and
spring acts in a precisely similar manner.
It is clear that our invention can be used for doors which only open one way
in which case only one spring, link, lever, and cam is used in place of the double
set of elements as shown in the drawings and described above.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
we claim is;
-
(1) The arrangement and combination of parts constituting self closing
mechanism for doors substantially as described and illustrated.
(2) In a self closing mechanism for doors the arrangement and combination of
the outer and inner casings substantially as set forth.
:
Dated the 13th November 1899.
For the Applicants,
LORRAIN & PURVIS,
53, York Place, Edinburgh.