Improvements in Adjustable Door Springs.
Year: 1894

page_text: Date of Application, 16th Mar., 1894
Complete Specification Left, 15th Dec., 1894-Accepted, 16th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in Adjustable Door Springs.
JAMES ADAMS Engineer 7 Union Street, Borough London S.E. do hereby
declare the nature of this invention to be as follows:-
This invention relates to that class of springs generally applied to the back of
doors to close them one way only, but which may also be applied to other similar
purposes.
It consists of a spring attached to a lever at one end and to a worm wheel
at the other end, both these ends are attached to a plate or base, the worm
wheel is for the purpose of charging and regulating the tension of the spring to
any strength desired, the lever delivers the power of the spring to another lever,
this second lever is hinged to the door frame or other suitable position and is
also brought into contact with the door, it also carries one or more friction
rollers.
The mechanical combination of this apparatus is so applied that the power of
the spring is greatest on the door when closed.
Dated this 16th day of March 1894

page_text: Fig. 2 plan of Fig. 1, the dotted lines ", " show the positions of the door
closed and open, the dotted lines "j" show the position of the apparatus when
open.
Fig. 3 enlarged or full size plan of the rollers "
carrying stud.
e," 66
Fig. 4 sectional elevation of Fig. 3 in detail, "n, n, n, n
lubricating cup, "s" the stud.
n
""
the cavity,
"
8 the
"
the cavities, 66
"
0 the
Fig. 5 enlarged or full size sectional plan of the worm and wheel "d," "k" the fly
key for winding same.
"
Fig. sectional elevation of Fig. 5 showing the bearing "f" and the carrying
stud "q" with the recess "." This recess is for carrying the end of the spindle
of the lever "." The boss "" is for carrying the end of the spring "a."
The same letters indicate like parts in all the figures.
This apparatus consists of a spring or springs "a attached to a lever "b" and
axis or spindle at one end and to a worm wheel "d" and axis at the other end,
both ends of this axis or spindle works in bearings "ff" attached to a plate
or base "g." The worm wheel "d" is for the purpose of charging and regulating
the tension of the spring to any strength desired. The lever "" delivers
power of the spring to lever " C. This second lever may be jointed or hinged
to the door. frame, or other suitable position at one end whilst the other end is
brought into contact with the door "i." The lever "c" carries one or more
friction rollers "e" with lubricating cups
the
66
a
י,
"
66 "
0.
The mechanical combination of this apparatus is so applied that the power of the
spring is greatest on the door when closed.
I prefer to cover the spring with a tube.
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:
1st. The combination and action of two levers substantially as described and set
forth in the drawings, for back springs for closing doors.
2nd. The spring acting on the two levers substantially as described and set forth
in the drawings for back springs or any mere modification thereof.
3rd. The manner of charging and regulating the spring or springs with worm
and wheel substantially as described and set forth in the drawings for door springs,
or any mere modification thereof.
4th. The general combination action substantially as described and set forth in
the drawings for closing single action doors either right or left handed.
Dated this 15th day of December 1894.
JAMES ADAMS.