An Improvement in Rack-pulleys for Window Blinds, and to be used for similar purposes.
Year: 1890

page_text: Date of Application, 26th Feb., 1890
Complete Specification Left, 25th Nov., 1890-Accepted, 21st Feb., 1891
PROVISIONAL SPECIFICATION.
An Improvement in Rack-pulleys for Window Blinds, and to be
used for similar purposes.
I, HENRY SMITH, of 61, Blythe Street, Ladywood, Birmingham, Brass Founder,
do hereby declare the nature of this invention to be as follows:-
The rack pulley may be made out of sheet metal, or cast; in brass, or any other
metal, or combination of metals.
The rack pulley consists of a quadrant plate, fixed at right angles to a back
plate; a radius bar, in one, or two parts, or pieces; a wheel; and a screw pin.
The quadrant plate may be attached to the back plate by rivetting, or the two
The back
plates may be formed in one piece, out of sheet metal, or cast metal.
plate will contain screw holes for fixing to the side of window.
The quadrant plate contains a slot. Upon this plate the radius bar works,
upon a pivot so placed that a screw pin, with china or other knob, moving in
the slot, by pressing against either a washer or a second bar, will tighten the
bar at any point of the quadrant. At the end of bar a wheel is fixed to which
the blind cord is attached; by pulling down the radius bar and screwing the
knob, the tension of the cord is effected, and a better control of the blind is
obtained than in the ordinary way.
The rack pulley may be made also with teeth placed either internally or
externally upon the quadrant plate, to work either with or without a spring, so
as to act as a ratchet. The rack pulley may be adapted for use with an endless
blind cord by making one radius bar shorter than the other. The rack pulley
may be adapted for use with a single line blind cord.
DL 5th do of Woma 1900
COMPLETE SPECIFICATION.
An Improvement in Rack-pulleys for Window Blinds, and to be
used for similar purposes.
I, HENRY SMITH, of 61, Blythe Street, Ladywood, Birmingham, Brassfounder,
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
The rack pulley may be made out of sheet metal, or cast; in brass, or any
other metal, or combination of metals. The rack pulley consists of a quadrant
plate A, 6ixed at right angles to a back plate B; a radius bar C, in one or two
parts, or pieces; a wheel D; and a screw pin E.
+
The quadrant plate may be attached to the back plate by rivetting, or the
two plates may be formed in one piece, out of sheet metal or cast metal. The
back plate will contain screw holes F F for fixing to the side of window.
The quadrant plate contains a slot G. Upon this plate the radius bar works,
upon a pivot H so placed that a screw pín E with china or other knob K,
moving in the slot G, by pressing against either a washer or a second bar C¹,
will tighten the bar at any point of the quadrant. At the end or side of bar,
a wheel D is fixed, upon which the blind cord L runs; by pulling down the
radius bar C, and screwing the knob K, the tension of the cord is effected, and
a better control of the blind is obtained than in the ordinary way. The rack
pulley may also be made with teeth M M placed externally upon the quadrant
plate, to work either with or without a spring N; so as to act as a ratchet.

page_text: The rack pulley may be adapted for use with an endless blind cord, by making
one side O of radius bar shorter than the other P.
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. It is a quadrant blind rack pulley with an adjustable screw or ratchet for the
purpose of tightening the blind cord with the greatest nicety.
2. The pulley wheel is placed to work parallel with the roller, to avoid twisting
of the blind cord.
Dated this 24th day of Nazzambion 1800
HENRY SMITH.