and other Cords.
Year: 1886

page_text: and other Cords.'
I, SIDNEY GRAFTON, of William Edward Street, Birmingham, Mechanical
Engineer, do hereby declare the nature of my said invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
I will describe my invention as applied to blind cords.
"
My improved apparatus is applicable to blind cords of the kind called "endless
that is to say when a continuous cord passes over the blind roller and also over a
pulley below it and where by the action of the operators hand in pulling at one
side or the other of the cord, the blind roller is rotated and the blind wound up or
let down as the case may be.
The object of my invention is to provide an easy means of taking up any slack
there may be in the cord and of keeping it tightly stretched. To effect this, the
small pulley over which the blind cord passes is in my improved apparatus carried
upon a radial arm having a pivot or fulcrum at its other extremity, by which pivot
it is connected to a back plate fastened to the wood work of the window frame.
The radial arm has an eccentric boss surrounding the pivot and I provide a wedge
which is placed between the eccentric boss on the radial arm and the back plate.
By raising this wedge the radial arm is left free to move and with its pulley is
then placed in such a position as to strain the blind cord to the necessary degree of
tightness the wedge falls by its own weight or is pushed down till it tightly
engages between the eccentric boss on the pivot of the radial arm, and the back
plate thus holding it firmly, that is the radial arm in position and keeping the
blind cord tightly stretched. I provide the wedge with horns which serve as
guides to its movement on the back plate, and also with a stop to prevent it being
taken out and lost. The back plate has suitable projections to form the fulcrum or
pivot, and screw holes for attaching to the woodwork of the window frame.
Having thus specified the object and nature of this my said invention for
improved apparatus to be employed in the adjusting of blind and other cords,"

page_text: its description will be proceeded with in reference to the accompanying drawings
(that is to say)
Fig. 1 is a vertical section shewing the apparatus in two positions one in full line
and one in dotted.
Fig. 2 is a side elevation of the apparatus.
Fig. 3 is a front elevation of same.
Fig. 4 is a detail of the radial arm and its pulley, in front and side elevation.
Fig. 5 is a detail of the wedge in front and side elevation.
Fig. 6 is a detail of the back plate in front and side elevations.
The same letters of reference upon the several figures indicate like or corre-
sponding parts.
a is the small pulley of the kind hitherto employed, b is the radial arm, with
axis cupon which a rotates; d is the pivot or fulcrum supported to and from the
back plate e by the projections f. g is the eccentric boss of b, and h is the wedge,
and i the horns for guiding the same j is the stop, the whole is affixed to the
window frame by means of the screwholes k.
I do not confine myself to the precise details herein given and set forth and
shewn on the accompanying drawings but that I hold myself at liberty to alter or
modify the same without departing essentially from the principle of my said
invention. I do not claim the construction of parts taken separately and apart
- from each other.
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,-
1st. The construction and application of the radial arm b with its axis c, for
carrying the pulley a and its eccentric boss g in combination with the wedge h.
2nd. The construction combination or arrangement of parts, the whole forming
"Improved apparatus to be employed in the adjusting of blind and other cords."