Improvements in Door Checks and Door Springs.
Year: 1887

page_text: Date of Application, 8th Mar., 1887
Specification Accepted, 22nd Apr., 1887
COMPLETE SPECIFICATION.
Improvements in Door Checks and Door Springs.
I, GEORGE FREDERICK NEWMAN of the Firm of William Newman and Sons of
Hospital Street Birmingham in the County of Warwick, Manufacturer, 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 —
My invention relates particularly to that class of door springs and door checks, or
combined door springs and door checks, and which latter are commonly called air
springs, in which compressed air is employed to cushion a piston working within a
cylinder and which said cylinder has within it a coiled spring.
In case of a check, air is employed simply to cushion a piston, to prevent the
slamming of doors, on the closing of the same by springs, while in the case of a
spring, the spring is enclosed within a cylinder, and behind a piston, which moves
with the door to which the appliance is connected.
My said invention has reference to the arm, or the rod part, or that part which
connects the fixed bracket, to the end of a movable piston rod, whose inner end
carries a piston, which works within a cylinder, secured to, and carried by a door.
Usually the arm or rod, or the arms or rods, or their equivalents, of ordinary door
springs, checks, or combined springs and checks, are so made, or constructed, that
they extend from the attachment bracket to the full length of the enclosing cylinder
of the device, and secured to the outside end of a piston rod, passing through the oft
end cap of the said cylinder.
Now the object of my invention is to simplify this means of connection, by making
the piston rod pass through the near end cap of the cylinder, and connecting the end
of the said piston rod to the fixed bracket secured upon the jamb of a door, by a simple
curved link, bowed upwardly; and this said invention is an improvement upon an
invention for which Letters Patent has been applied for by me on the 12th day of
March 1886, and numbered 3480.
I will describe my invention in connection with a door spring.
Figure 1 is a perspective view of a door spring, constructed according to my
invention. Figure 2 is a plan of the same (full size) with a portion of the cylinder
broken off. Figure 3 is a side elevation of figure 2, with the link in section.

page_text: Figure 4 shows a side elevation of the link separately, while figure 5 is a side
elevation, and figure 6 is a plan of the upright bracket.
a is the cylinder of the spring, secured to the back of a door 6, by feet or brackets a²,
made with the cap, and which said brackets are disposed at the two opposite ends of
the said cylinder.
The door is hung upon hinges 63, so as to admit of the door opening in the direction
indicated by the arrow.
8
e is a piston rod (carrying at its insale end a piston) working through the near
inside end of the cylinder that is, through that end presented to the hinge joint of
the door. is an upright or standing out bracket, secured or attached on the inside
face of the frame or jambe of the door; thus the bracket stands in the plane of the
back of the door, and at right angles to the inside of the jamb or frame; and which
said bracket and piston rod are connected and coupled together by a link (pre-
ferably bowed outwardly) and is connected to the top of the aforesaid brackel d, and
piston rod c, by joints or joint pins f³.
On the opening outwardly of the door, in the direction indicated by the arrow,
the bracket end of the link turns upon the joint 2 as a fulcrum, so that the pull upon
the piston rod, is always in a direct line with the cylinder, as the said rod and cylinder
follow the constant, angular motion of the door, while the bracket serves only as the
fulcrum and stay for receiving the pull.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed, I declare that what I claim is :—
:
First Connecting, or making the connection between the fixed upright bracket,
and the end of a piston rod (working outwardly in the direction of the bracket) by
means of a link or its equivalent, secured to the aforesaid paris by joints, substantially
as described and set forth.
Secondly The arrangement and combination of the parts of door springs, door
checks, or combined door springs and checks, as hereinbefore described and set forth
in figures 1, 2 and 3 of the accompanying Drawing.
Dad this Figl Lay of Mah 1987