IMPROVEMENTS IN ROLLER BLIND FURNITURE
Year: 1885

page_text: I WILLIAM DOBSON, of 20 Derby Square, Douglas, Isle of Man, Engineer, do
hereby declare the nature of said Invention for IMPROVEMENTS IN ROLLER BLIND
FURNITURE, to be as follows:-
My invention relates to improvements in roller blind furniture and consists
chiefly in the use and application of an adjustable spring for the purpose of
regulating and maintaining tension on the blind cord.
In performing my Invention I secure a bracket or fixing as usual to the window
frame or other convenient part. This bracket carries a rod which has a thread
formed on the whole or part of its length. The roller or grooved block round
which the blind cord revolves is mounted loosely upon and is free to slide on the
rod, but is or may be kept from turning round by making the rod square or in any
other convenient manner. There is also loose on the rod a spiral springione end
of which bears against the roller bracket or grooved block and the other against a
nut working on the thread of the rod so that by turning the nut the spring can be
slackened or compressed and the tension on the blind cord regulated.
Dated this 97th dor of Ano 1905
H. B. BARLOW,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Roller Blind Furniture.
I WILLIAM DOBSON, of 20 Derby Square, Douglas, Isle of Man, Engineer, do
hereby declare the nature of said Invention for IMPROVEMENTS IN ROLLER BLIND
FURNITURE, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
My invention relates to improvements in roller blind furniture and consists
chiefly in the use and application of an adjustable spring for the purpose of regu-
lating and maintaining tension on the blind cord,

page_text: In performing my Invention I secure a bracket or fixing as usual to the window
frame or other convenient part. This bracket carries a rod which has a thread
formed on the whole or part of its length. The roller or grooved block round
which the blind cord revolves is mounted loosely upon and is free to slide on the
rod but is or may be kept from turning round by making the rod square or in any
other convenient manner. There is also loose on the rod a spiral spring one end
of which bears against the roller bracket or grooved block and the other against a
nut working on the thread of the rod so that by turning the nut the spring can be
slackened or compressed and the tension on the blind cord regulated.
And in order that my Invention may be fully understood and readily carried
into effect I will describe the accompanying Sheet of Drawings, reference being
had to the figures and letters marked thereon.
Figure 1 is a front elevation and Fig. 2 a side elevation of a roller blind tension
regulator to which my improvements are applied.
In these views.-a designates the usual frame or fixing which is screwed or
otherwise secured to the window frame or other convenient part; secured in the
frame a is a rod b which in this instance is square in section and has a thread cut
on the four corners or edges throughout a part of its length; c is a frame or bracket
free to slide but not to turn on the rod b and carrying the grooved block or
pulley d round which the blind cord e passes; f is a spring loose on the rod b one
end of said spring bearing against the bracket c and the other end against a nut g,
so that by turning the nut g in one direction the spring f is compressed and the
tension of the blind cord e increased and vice versa by screwing the nut in the
other direction the spring is slackened and the tension lightened.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
1. The use and application of an adjustable spring for regulating and maintaining
the tension of the blind cord, substantially in the manner herein described and
as illustrated by the accompanying Drawings.
2. In roller blind furniture, the combination with a frame or pulley block
mounted loosely on a threaded rod supported in a suitable frame or fixing, of a
spring adjustable by screwing a nut on said rod, substantially as herein set forth
for the purposes specified.