Improvements in or relating to the Construction of Rack Pulleys for Window Blinds and other purposes.
Year: 1892

page_text: Date of Application, 27th July, 1892
Complete Specification Left, 27th Apr., 1893-Accepted, 10th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Construction of Rack Pulleys
for Window Blinds and other purposes.
I, HARRY STOCKTON JUDD of 4 Friar Lane Leicester, Architect and Surveyor,
do hereby declare the nature of this invention to be as follows:-
:-
This invention has reference to rack pulleys applicable for window blinds and
other purposes and is designed with a view of providing a rack pulley by the use
of which the endless cord by which the blind is raised or lowered shall be
maintained in a tight or tant condition.
For this purpose and according to my invention the pulley is loosely mounted
on the horizontal upper end of a spring encircled rod or equivalent enclosed
within a suitable casing which may be screwed or otherwise secured to the window
frame.
The spring may be located between two nuts or washers on the rod referred to
so as to be slightly compressed between them when the cord is on the pulley, or
the compression of the spring may be effected by other means within the casing
if desired.
r 1
1003
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to the Construction of Rack Pulleys
for Window Blinds and other purposes.
I, HARRY STOCKTON JUDD of Friar Lane Leicester, Architect, and Surveyor,
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 :-
This invention has reference to rack pulleys applicable for window blinds and
other purposes and is designed with a view of providing a device by the use of
which the endless cord by which the blind is raised or lowered, shall be maintained
in a tight or taut condition.
For this purpose and according to my invention a pulley is loosely mounted
on the horizontal upper end of a spring encircled rod or equivalent enclosed
within a suitable casing which may be screwed or otherwise secured to the window
frame.
The spring may be located between two nuts or washers on the rod referred
to so as to be slightly compressed between them when the cord is on the pulley,
or the compression of the spring may be effected by other means within the casing
if desired.
Referring to the drawings accompanying this Specification,
Figure is a side elevation and Figure 2 a section of a cord holding device
constructed in accordance with this invention.
Figure 3 is a section showing the rod elevated partly out of its casing and the
spring under compression as when in use.
Figure 4 is a plan of the nut on the end of the spindle.
Similar letters of reference indicate the same parts in each of the figures.
The window blind cord, or other endless cord passes round the pulley A which
is movably carried on the spindle B.

page_text: The latter is provided at one end with the usual ornamental knob C and its
opposite end is either screwed to or formed integrally with a rod B' which passes
into a casing D of any suitable shape provided at its extremes with lugs or plates D'
which may be fastened in position by screws E passing through holes D therein
and into the side of the window frame.
The rod B' has formed near its upper end a shoulder B2 which rests on the top
of the casing D and on its screwed lower end B³ it carries a nut F (Fig. 4)
between which and the upper part of the inside of the case, a spring G encircling
the rod B¹ is compressed.
The rod B' does not reach the bottom of the case D when in its normal position
so that the nut F thereon has a slot F¹ across its face so as to receive the end of a
screw driver or other tool for fixing it in position or removing it.
The cord holding device when fixed in position to hold the cord taut or tight,
has the rod B' raised and the spring G only partly compressed as in Figure 3 and
when in this position it admits of any contraction or expansion of the cord conse-
quent upon varying atmospheric conditions taking place, without any undue tension
or slackening of the cord.
In the drawings I have shown a spiral spring as encircling the rod B₁ but it is
obvious that any other suitable form of spring may be used for the purpose and
that instead of placing the spring round the rod, one end of the spring might be
connected to the bottom of the rod (the latter being made somewhat shorter) and
the other end to the bottom of the case by any suitable means.
It is also preferable to enclose the spring and rod by a casing such as D but in
a cheaper form of cord holding device the casing might be omitted.
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 a cord holding device for window blinds and other purposes the combination
of a cord pulley such as A and a spring-controlled rod such as B substantially as
and for the purpose described and illustrated in the accompanying drawing.
2. The constructing of a cord holding device so that the endless cord by which
the window blind is raised or lowered is constantly maintained in a tight or taut
condition by the use or application of a spring substantially in the manner
described and illustrated in the accompanying drawing.
Dated this 26th day of April 1893.
HARRY STOCKTON JUDD.
W. P. Thompson & Boult,
Agents for the Applicant.