IMPROVEMENTS IN RACK PULLIES FOR BLIND CORDS AND THE LIKE
Year: 1882

page_text: LETTERS PATENT to Charles Priestland of Birmingham, in the county of
Warwick, Tool Maker for an invention of "IMPROVEMENTS IN RACK PULLIES
FOR BLIND CORDS AND THE LIKE,”
PROVISIONAL SPECIFICATION left by the said Oharles Priestland at the
Office of the Commissioners of Patents on the 4th July 1882.
CHARLES PRIESTLAND, of Birmingham, in the county of Warwick, Tool Maker,
"IMPROVEMENTS IN RACK PULLIES FOR BLIND CORDS AND THE LIKE
"
This invention relates to improvements in rack pullies for blind cords and the
like, whereby the strength of the rack, pulley is increased and a more finished
appearance given to the pulley as the usual teeth, or rack, are not visible.
In carrying out my improvements the edges of the vertical slot in which the
pulley carrier slides are turned inwards at right angles thereby forming a rim or
flange; the said flanges or turned in portions being cut with rack teeth or notches
the teeth of one side corresponding with those of the other: side. The pulley
carrier is provided with a spring slide fitting and working in the pulley frame, the
bottom of the front part of the same being turned up so as to form a tooth which
takes into the said rack teeth in the frame. By this construction to raise or lower
the pulley carrier or slide it is simply necessary to press its thumb plate so as to
move the tooth out of the teeth of the rack and when the carrier or slide is in the
required position and pressure. is removed from the slide the tooth will take into
a corresponding tooth of each rack so as to retain the slide in position.
Instead of turning in the edges of the vertical slot in the front of the frame and
forming the same with teeth as hereinbefore described, the back of the pulley
frame may be formed with a slot the edges of which are turned in and formed
with teeth in a similar manner to that herein before described, the tooth on the
spring of the pulley carrier being at the back instead of at the front.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Priestland in the Great Seal Patent Office on the
4th January 1883.
CHARLES PRIESTLAND of Birmingham in the county of Warwick, Tool Maker
“IMPROVEMENTS IN RACK PULLIES FOR BLIND CORDS AND THE LIKE,”
This invention relates to improvements in rack pullies for blind cords and the
like whereby the strength of the rack pulley is increased and a more finished
appearance given to the pulley as the usual teeth, or rack, are not visible.
In carrying out my improvements the edges of the vertical slot in the frame in
which the pulley carrier slides are turned inwards at right angles, thereby forming
à rim or flange; the said flanges or turned, in portions are cut with rack teeth or
notches the teeth of one side corresponding with those of the other side. The
pulley carrier is provided with an ordinary spring slide fitting and working in the
pulley frame, the bottom of the front part of the same being turned up so as to
form a tooth which takes into the said rack teeth in the frame.
In order to enable my Invention to be better understood I will proceed to
describe the same by reference to the accompanying drawing in which figure 1 is
a front elevation; figure 2, a vertical section and figure 3 a transverse section on
line A B of figure 1 of the frame of a rack pulley constructed according to my
improvements; figure 4 front elevation of the rack pulley complete and figure 5 a
vertical section of the same the pulley carrier or slide being in elevation. Similar
letters in all the figures represent similar parts.
a, a, is the frame of the rack pulley; b, the vertical slot in the same; c, o, are
the sides of the slot turned inwards at right angles as shown in the sectional views
at figures 2 and 3, the said sides c, c, being cut with rack teeth or notches as shewn
or with other suitably shaped teeth or notches; d is the pulley carrier with the
spring slide e; the bottom of the front part of the said slide being turned up so as
to form a tooth, which takes into the herein before described rack teeth or
notches.
By this construction to raise or lower the pulley carrier or slide d, it is simply
necessary to press its thumb plate g, so as to move the tooth f, out of the teeth of
the racks c, c, and when the carrier or slide d, is in the required position and
pressure is removed from the slide the tooth will take into a corresponding tooth
of each rack as shewn in figure 5, so as to retain the slide in position.
Instead of turning in the edges of the vertical slot in the front of the frame and
forming the same with teeth as herein before described and shewn in the drawing
it will be evident that the back of the pulley frame may be formed with a slot the
edges of which are turned in and formed with teeth in a similar manner to that
herein before described, the tooth on the spring of the pulley carrier being at the
back instead of at the front.
Having thus described the nature of my said invention and the best means I
am acquainted with for carrying the same into effect I wish it to be understood
that I make no claim to the pulley carrier or slide and toothed spring taken
separately but What I do claim is :-
The hereinbefore described improved rack pulley for blind cords and the like in

page_text: which the rack teeth or notches are formed on turned in edges of the alot of the
frame whether at the front or back of the frame as hereinbefore described and
represented in the accompanying drawing.
In Witness whereof I the said Charles Priestland have hereto set my hand
and seal this Second day of January in the year of our Lord one thousand
eight hundred and eighty three