Improved Means for Adjusting Blind Cord Pulleys.
Year: 1892

page_text: Date of Application, 11th July, 1892
Complete Specification Left, 11th Apr., 1893-Accepted, 13th May,
1893
PROVISIONAL SPECIFICATION.
Improved Means for Adjusting Blind Cord Pulleys.
I, THOMAS HENRY PARKIN, of No. 3 Hicks Square, Market Street,
Birmingham, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention consists of the hereindescribed improved means for adjusting the
bottom pulley of a continuous window blind cord.
My invention is carried out as follows:-
The said pulley is carried on the outwardly projecting arm of a short lever which
by a cross fulcrum pin is jointed to a sliding piece embracing the vertical bar of a
bracket which bracket at its ends is adapted for fixing to the window frame like
the rack of a rack pulley. That end of the said lever which is between the
fulcrum pin and the face of the vertical bar is so shaped that the tension of the
blind cord in raising the lever with the pulley thereon, pinches the bar tightly
between the 'lever and the sliding piece so as to hold the sliding piece and pulley in
that position.
When it is desired to tighten the blind cord it is simply necessary to press the
roller and slide down the vertical bar and when the desired tension of the cord has
been obtained the pulley is released and the lever and slide immediately grip the
bar as before. There is a heel on the lower side of that end of the lever which
acts upon the bar which heel prevents the lever biting the bar when the slide is
being pushed down.
"
When it is desired to move the slide and pulley up the bar to slacken the cord or
to remove the same from the pulley, the pulley has to be pushed down through a
very short space to free the lever and slide from the bar when the slide and pulley
can be moved up the bar together. The said 'bar and the acting face of the lever
can either be made smooth or formed with teeth or otherwise roughened to increase
the grip.
Dated this day of July 189
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improved Means for Adjusting 'Blind Cord Pulleys.
1, THOMAS HENRY PARKIN, of No. 3, Hicks Square, Market Street,
Birmingham, Engineer, do hereby declare the nature of this invention and in what
nanner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention consists of the hereindescribed improved means for adjusting the
bottom pulley of a continuous window blind cord.
My invention is carried out as 'follows:-
:-
The said pulley is carried on the outwardly projecting arm of a short lever which
by a cross fulcrum pin is jointed to a sliding piece embracing the vertical bar of a
bracket which bracket at its ends is adapted for fixing to the window frame like
the rack of a rack pulley. That end of the said lever which is between the
fulcrum pin and the face of the vertical bar is so shaped that the tension of the
blind cord in raising the lever with the pulley thereon, pinches the bar tightly
between the lever and the sliding piece so as to hold the sliding piece and pulley in
that position

page_text: When it is desired to tighten the blind cord it is simply necessary to press the
roller and slide down the vertical bar, and when the desired tension of the cord has
been obtained the pulley is released and the lever and slide immediately grip the
bar as before. There is a heel on the lower side of that end of the lever which acts
upon the bar which beel prevents the lever biting the bar when the slide is being
pushed down.
When it is desired to move the slide and pulley up the bar to slacken the cord
or to remove the same from the pulley, the pulley has to be pushed down through
a very short space to free the lever and slide from the bar when the slide and
pulley can be moved up the bar together. The said bar and the acting face of the
lever can either be made smooth or formed with teeth or otherwise roughened to
increase the grip.
I will now refer to the accompanying drawings on which
Fig. 1 is a general view of the blind cord bracket provided with a pulley mounted
on the gripping lever and sliding piece in accordance with my invention;
Figs. 2 and 3 are sectional elevations of the same illustrating the action of the
gripping lever and slide as hereinafter more fully described;
Fig. 4 represents in sectional elevation in back elevation and in plan the said
gripping lever and pulley separately and
Fig. 5 shews my invention applied to a slightly different form of bracket to that
shewn in Figs. 1, 2, and 3.
A is the bracket which is made with the vertical bar a' on which the sliding
piece B can slide freely up or down. The bracket A is fixed by screws through
the holes a² a³. This sliding piece B embraces the bar a' and has two ears b¹¹
between which the short lever C is jointed by the cross fulcrum pin d. E is the
blind cord pulley which is free to turn on the lever C and around which the
continuous blind cord passes in the usual manner. The part of the lever C
which is between the fulcrum pin d and the face of the vertical bar a is curved
gradually farther from the centre of the fulcrum pin d (see Fig. 4) so that the
tension of the blind cord fin raising the lever C causes the bar a to be pinched
tightly between the part c¹ of the lever and the back part of the slide B so as to
hold the sliding piece B in the position in which it may be. is the heel which is
formed on the lower side of that end of the lever C which acts upon the bar a to
prevent the lever C biting the bar a when the slide B is being pushed, down...
To tighten the blind cord fit is simply necessary to press downwardly the
pulley E (see Fig. 3) so as to release the bar a' and then when the desired tension
of the cord has been obtained and the pulley E is released, the tension of the cord f
causes the lever and slide to immediately grip the bar a¹ as before.
To move the slide B and pulley E up the bar to slacken the cord for to remove
the same from the pulley E the pulley E has first to be pushed down as shewn in
Fig. 3 through a very short space to free the lever C and slide B from the bar a¹
and then the slide and pulley can be moved up the bar a' together.
The bar a' and the acting face c¹ of the lever C can either be made smooth as
shewn, or formed with teeth or otherwise roughened to increase the grip, but I find
that no such teeth or roughening is necessary.
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. In an appliance for adjusting blind cord pulleys, the use of a lever carrying
the said pulley and jointed to a slide which embraces and can be moved up or
down upon a vertical bar, the said lever being so shaped that when it is turned
upwardly about its fulcrum by the tension of the blind cord the said bar will be
gripped between the lever and the slide and when the lever is turned downwardly
the slide will be free upon the bar, all substantially as herein before set forth.
2. In combination with the vertical bar such as a' of a blind cord pulley bracket,
the slide B embracing the bar a' and free to slide thereon, and the lever c carrying

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the blind cord pulley E and jointed to the slide B and shaped so as with the slide B
to grip the bar when the lever is turned upwardly and so as to release the bar when
the lever is turned downwardly all substantially as hereinbefore described and
illustrated by the accompanying drawings.
Dated this 10th day April 1893.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.