AN IMPROVED COMBINED DOOR SPRING AND CHECK
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Edward Ward Cooper at the Office
of the Commissioners of Patents on the 13th December 1877.
EDWARD WARD COOPER, of Coventry, in the County of Warwick, Machinist.
"AN IMPROVED COMBINED DOOR SPRING AND CHECK."
This Invention relates to an improved door spring provided with a check or stop
whereby the action of the spring can be controlled or regulated in such a manner as
to arrest or stop the closing of the door at any desired position.
The said Invention consists chiefly in the combination with the spring of a check
or stop for the above purpose, and in the construction of the spring with three parts,
two fitted to slide or work within the other, and one of which is secured or made
fast to the door post, and another is made fast to the door.
The said spring is constructed with two tubes, one of which is fitted to slide
telescopically within and project from one end of the other tube. A spiral spring
is placed between these two tubes, and is so arranged that it acts against a small
collar on the inner tube, and tends always to force the said inner tube out of or
away from the outer tube; that is to say, it tends always to clongate the door
spring. At the opposite end of the said outer tube and sliding within the same I
arrange a sliding rod, and another spiral spring placed within the said inner tube
tends always to draw the said tube inward or to shorten the door spring between
its two points of attachment. The outer end of this rod is jointed to a small bracket
fixed on the door post, and the outer end of the inner sliding tube is similarly
attached to a small bracket on the door
The aforesaid check or stop is arranged as follows, that is to say-Through the
outer tube and extending along a portion of its length, I form a slot in which I fit
a small clamping piece that extends partially around the said inner tube, and which
is arranged to lie in front or on the outer side of the said collar on the inner tube.
This clamping piece has a screw stem which projects through the slot in the outer
tube, and has a nut on the outside of the same. When this nut is slack or
unscrewed the said clamping piece can be adjusted or moved end wise along the said
slot, and can then, by tightening or screwing up the nut, be secured in any desired
position. By this adjustment of the said clamping piece or check the action of the
P 971

page_text: door spring can be regulated as required, and the closing of the door may thus be
arrested at any determined position.
1
Instead of this clamping piece provided with a screw nut, as above described, I
may use any other suitable form of check or stop; for instance, I may have a series
of holes diilled through the outer tube or case, and provide a pin or bolt to be 5
inserted in either of these holes, according to the desired extent of range or action
of the door spring.
By the above-described improved construction of door springs I obviate the
inconvenience and cost of the usual straps or other means employed to regulate the
closing of the door, and I also provide a door spring which will work with much 1
greater case and will be more durable and less unsightly than those which have
one end loose or unattached, as in ordinary door springs.