Year: 1885

page_text: WILLIAM FRYER.

page_text: COMPLETE SPECIFICATION.
New Spring Arrangement for Closing Doors and other Purposes.
I, WILLIAM FRYER 75 Ladypool Road Sparkbrook Birmingham, in the county
of Warwick Plumber, painter &c, do hereby declare the nature of my invention
for NEW SPRING ARRANGEMENT FOR CLOSING DOORS, AND OTHER PURPOSES and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This invention relates to the construction and arrangement of springs for the
self-acting closing of doors, and has for its object the employment of an involute
spiral spring, in connection with other parts hereinafter described and shewn upon
the accompanying sheet of drawings.
As already intimated I have appended hereunto a sheet of drawings for the
purpose of illustrating this my invention, and assistance in my description, upon
which are figures and letters of reference, like letters referring throughout to the
same thing.
Fig. 1 is a front elevation of this my spring.
Fig. 2 is a sectional elevation of Fig. 1 upon line A-B.
Fig. 3 is a sectional elevation of Fig. 4 upon line C. D.
Fig. 4 is a side elevation of Fig. 1.
a, is a plate or base upon which is formed a boss b, and also provided with
holes c, or other equivalent means for securing the said plate to, a. door or to a
fixture. The boss b has a central hole into which a curved pin d is secured.
If desired however I may form this central pin in one piece with the boss b, by
extending such boss, and providing at its end e, a screw and screw nut, or, after
the spring box f, has been placed in position I may secure it by rivetting over the
end of the said pin (extension of boss b) at e. At g, I provide a stop in the plate a,
the purpose of which will be hereinafter mentioned. f, is the spring box which is
also provided at its centre with a boss h, which is bored to suit the central pin d,
or its equivalent, so that it may rotate thereon, or if preferred the said pin d may
be fixed in the centre of the spring box, and rotate in the boss b. At i provision
is made to secure the one end of an involute spring k, the other end of this spring
being secured upon and to the boss b, upon the plate at l, This spring is shewn in
section in Fig. 2 as being flat, but if desired I may make them of other sections, as
for instance they may be round or square; and also, I may place more than one in
a box by placing them side by side, although as a rule, the flat section, and single
spring is found to answer sufficiently well.
Further, the direction in which the spring is bent in order to form the involute
spiral, may be either to the right or to the left hand.
Again, upon the exterior of the spring box, I form two collars or flanges m, & n,
thereby providing a recess o, to serve as a guide for the chain p. At q I provide
a pin to which is secured the one end of this chain p, the other end of the
chain being provided at r, with eye, loop, or hook to attach to the detachable
fastening s. I may if desirable substitute this chain by cord or other suitable
flexible material.

page_text: At t, I provide a stop, which by coming in contact with the stop g, in the
plate a, limits the motion of the spring box f, in the direction of the pull of the
spring.
It will now be seen that the action of this my invention is as follows:-
The spring box part of the arrangement is secured to the lintel, door post, or
other fixture, and the detachable fastening 8, is attached to the door by means of
the screw holes u, or, this order may be reversed according as circumstances dictate.
Upon the door being opened it will be found that the pull of the chain p, or its
equivalent, in the direction of the arrows, rotates the spring box f, and thereby
bringing the spring k into tension. As soon however as the opening force of the
door is removed this stored up tensile energy of the spring k, unwinds itself, and
brings back the door to its closed position.
I do not limit myself to the precise shape of the detail parts of the spring as they
are shewn upon the drawing. I may in the case of applying this my invention to
swing doors, place a spring upon each side of the door, so that the pull of each
spring shall bring the door to a central position, or I may modify the form of the
spring box f, and provide thereon two recesses or guides o, side by side, and attach
two chains or their equivalents, one leaving the spring box towards a detachable
fastening 8, to the right hand, and the other towards a detachable fastening 8 to
the left hand, as shewn by dotted lines in Fig. 5. In this case I may secure the
spring box part to the door and the two detachable fastenings 8, to a fixture.
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
The combination of parts forming a door spring, consisting of an involute spring,
or springs in connection with a spring box, base plate, cord or cords, chain or
chains fulcrum pin, and detachable hook, or hooks,, or any mere modification of the
same, as herein described and shewn upon the drawings.
1,1° -
P
11000
CHAS. T. POWELL,
Agent for the Applicant.