Improvements in Spring Centres for Swing Doors.
Year: 1894

page_text: Date of Application, 16th July, 1894-Accepted; 18th Aug.,
1894
COMPLETE SPECIFICATION.
Improvements in Spring Centres for Swing Doors.
I, THOMAS PEARD, Ironmonger, of 88 to 91 Drury Lane, in the County of
Middlesex, do hereby declare the nature of this invention and in what manner
he same is to be performed to be particularly described and ascertained in and
by the following statement :-
This invention applies to a well known type of spring door centre in which there
s a shoe fixed to the lower corner of the door and a pivot pin in a spring box let
nto the floor or pavement receives the shoe upon it. The pivot pin turns with the
door and it has a cam upon it; a roller carried by a slide is pressed against the
cam by springs. The cam as the door is opened compresses the springs; the springs
then tend to close the door; they also retain it when closed.
My improvements have for their object the adjustment of the springs to vary
the resistance they offer to the opening of the door; also to bring about the more
accurate closing of the door by adjustment for which provision is made.
I provide within the spring box a second slide to serve as a variable abutment for
the springs which are thus located between two slides.
In the abutment slide near its ends are two tapped holes and screws are received
into the holes.
The screws have barrel heads and these abut upon the end wall of the spring
box. The screws can be turned by means of a pin inserted into radial holes
formed in the barrel heads and in this way the abutment slide can be approached
to the pivot so as to increase the initial compression of the springs or can be allowed
to recede from it to diminish this compression.
The upper end of the pivot pin is square and is received into a corresponding
socket in the shoe. This socket has heretofore been a part of the shoe and conse-
quently, if the door when fitted should fail to close accurately, no after adjustment
has been possible.
I provide a separate socket piece; it is cylindrical on its exterior, and it fits
into a corresponding cylindrical recess in the shoe. An arm projecting from the
socket piece carries a nut and there is a screw which passes through the side cheeks
of the shoe and through the nut. These parts are so arranged that by turning the
screw the socket piece can be moved round in its recess in the shoe through the
small arc necessary to make, the required adjustment.
The socket piece is then locked fast by a pinching screw provided for the
purpose.
In order that my invention may be fully understood and readily carried into
effect I will proceed to describe the drawings annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is an elevation, partly in section, of a portion of a swing door centre
made in accordance with my invention.
Figure 2 is a plan of the spring box, the larger portion of the cover is
removed.
bis the cam, it is
There is a recess
Figure 3 is a plan partly in section of a portion of the shoe.
a is the pivot pin which supports the door and turns with it.
fast with the pivot pin. c is the roller which abuts on the cam.
in the cam which the roller c enters when the door is closed; this position of the
parts is represented in Figure 2. d is the slide which carries the roller c and e are
cides to control the slide: they are fixed upon the sides of the box. ff are the
Figure 1 is an elevation, partly in section, of a portion of a swing door centre
made in accordance with my invention.
Figure 2 is a plan of the spring box, the larger portion of the cover
removed.
is
Figure 3 is a plan partly in section of a portion of the shoe.
a is the pivot pin which supports the door and turns with it. is the cam, it is
There is a recess
fast with the pivot pin. C the roller which abuts on the cam.
in the cam which the roller centers when the door is closed; this position of the
parts is represented in Figure 2. d is the slide which carries the roller c and e are
guides to control the slide: they are fixed upon the sides of the box. ff are the

page_text: springs which press the roller up against the cam. 9 is the adjustable abutment
slide; it.has pins upon it to keep the springs in place, the pins enter corresponding
tubular projections on the back of the slide d. hh are adjusting screws fixed in
the slide g, they rest against the end of the box. ¹h are holes in the heads of
the screws to receive the pin employed to turn the screws for the purpose of
adjustment as previously explained. is a portion of the cover of the spring box.
The cover should fit closely to retain the oil with which the box is partially or
wholly filled. is the shoe to be fixed upon the door and is the socket piece.
The socket piece is lodged in a cylindrical recess in the shoe and it has a square
hole in it to receive the head of the pivot pin a. is the arm of the socket piece
and is the nut which is mounted upon this arm. The screw m passes through
the nut and also through the side cheeks of the shoe k in which the screw turns
freely. At one end of the screw there is a head adapted to be turned by a screw
driver and upon the other end of the screw a disc is rivetted. n is the pinching
screw which is screwed in to nip the socket piece firmly when the parts have been
properly adjusted. The pointed end of the screw n is received into a V groove in
the socket piece l.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. In a swing door centre, substantially as described, the adjustable abutment
slide 9 serving to adjust the initial compression of the springs ff as herein set
g
forth.
2. In a swing door centre, substantially as described, the separate pivot piece /
adjustably attached to the shoe k as herein set forth.
3. A swing door centre, substantially as described and represented by the
annexed drawings.
Dated this 16th dox of Tul 1904
THOMAS PEARD.