Improved Means for Holding the Cord of Roller Blinds in Tension.
Year: 1891

page_text: Date of Application, 5th Nov., 1891
Complete Specification Left. 10th Feb., 1892-Accepted, 12th Mar., 1892
PROVISIONAL SPECIFICATION.
Improved Means for Holding the Cord of Roller Blinds in Tension.
I HENRY JOHNSTONE of 47 Sloane Street, Kemp Town Brighton in the County
of Sussex Gentleman do hereby declare the nature of this invention to be as
follows:-
The object of this invention is a means whereby the endless cord of roller blinds
is held and kept always at one tension instead of employing the ordinary rack
which continually requires adjusting in order either to tighten or slacken the cord.
According to this invention I attach to one end of a spiral or rubber spring a
small pulley such spring to be suitably attached to the side of the window instead
of the ordinary rack the endless cord passing under the aforesaid pulley so that
such cord is kept always at the same tension by means of the aforesaid spring. A
convenient way of carrying out this invention is to enclose the spring in a metal
casing with the pulley coming out at the top such casing being provided with
suitable lugs or flanges in order to screw it in position.
Dated this 5th day of November 1891.
BROWNE & Co.,
9, Warwick Court, Gray's Inn, Agents for Applicant.
COMPLETE SPECIFICATION.
Improved Means for Holding the Cord of Roller Blinds in Tension.
I HENRY JOHNSTONE of 47 Sloane Street Kemp Town Brighton in the County
of Sussex Gentleman 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 object of this invention is a means whereby the endless cord of roller
blinds is held and kept always at one tension instead of employing the ordinary
rack which continually requires adjusting in order either to tighten or slacken
the cord.
According to this invention I attach to one end of a spiral or rubber spring a
small pulley such spring to be suitably attached to the side of the window instead
of the ordinary rack the endless cord passing under the aforesaid pulley so that
such cord is kept always at the same tension by means of the aforesaid spring. A
convenient way of carrying out this invention is to enclose the spring in a metal
casing with the pulley coming out at the top such casing being provided with
suitable lugs or flanges in order to screw it in position.
And in order that my said invention may be better understood I will now proceed
to describe the same with reference to the accompanying sheet of drawings in
which :-
Fig. 1. shews my improved means for holding cords in tension, as it would appear
when fixed in position.
Fig. 2. shews view of spring detached.
Similar letters denote the same parts in both views.
A. shews spring B. pulley attached to same C. cord D. bearings on which pulley
is mounted E case containing spring.
It will be seen by the drawings that the cord C. being passed round the pulley B.
is always kept in tension by the spring A. which latter is fastened at the bottom to
the case E or otherwise as desired. Instead of the spring being enclosed in the
case E. it may be fixed by means of the ring F. direct on to the woodwork.

page_text: Although I have shewn a spiral spring I do not wish to limit myself to this as 1
may employ any other suitable spring such as an indiarubber cord for example.
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:
I. The means of holding the cord of roller blinds in tension consisting of the
combination of the spring A. with the pulley B. substantially as described and
shewn.
II. The improved means for holding cords in tension substantially as set forth.
Dated this 10th day of February 1892.
BROWNE & Co.,
9, Warwick Court, Gray's Inn, W.C., Agents for Applicant..