Year: 1886

page_text: Date of Application, 6th Oct., 1886.
Complete Left, 5th July, 1887.
Complete Accepted, 16th Aug., 1887
RESERV
JOHN CAMPBELL, 19 North Tay Street, Dundee, N.B., Cabinetmaker do hereby
declare the nature of this invention to be as follows:-
This invention consists in the principle of bringing the required tension to bear
directly on the roller ends of cloth and other blinds by the application of a small
Indian rubber or other pulley in contact with roller end centred and working loosely
on a stud. On the lower part of said stud a pinching screw works for the purpose
of adjusting the stud with pulley attached to or from the roller end to get the required
tension to hold the blind in position desired. By this contrivance the same end is
attained in working cloth or other blinds without requiring the services of side ratchets
as necessary to the present "Rack Furniture." A small feather spring fixed into
the bracket to bear down on top of stud may be applied to cause continual friction in
company of pinching screw or without latter.

page_text: An Improvement in Window Blind Furniture.
I, JOHN CAMPBELL of 19 North Tay Street, Dundee, in the County of Forfar, North
Britain, Cabinetmaker, 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:-
:-
My Invention which relates to improvements in roller blind fittings, has for its
object to dispense with the usual rack for applying tension to the endless cord for
rotating the roller.
In accordance with my Invention a small wheel preferably of India Rubber is so
mounted above the periphery of the cord pulley that the latter, whilst being free to
be rotated when the cord is pulled, is held in check from running away by the weight
of the blind, by the pressure of the said small india rubber wheel upon the cord as
the latter lies in the groove of the pulley.
In order that my Invention may be properly understood and readily carried into
effect I will now proceed to describe the drawings hereunto annexed.
Figure 1, of the accompanying sheet of drawings is a front elevation of a roller
with my improvements applied thereto.
Figure 2, is an end elevation of the apparatus constituting my invention.
Figure 3, is modification hereinafter referred to. The small India Rubber wheel A
is mounted so as to rotate upon the stud a, which is screwed or otherwise secured to
the arm B. The said arm is secured adjustably to or upon the squared projection c of
the plate or bracket portion C which is or may be screwed to the side of the window D.
A pinching screw E works through the underside of the slotted portion b, of the said
arm B and against the underside of squared portion C of the bracket and regulates
the degree of bearing of the rubber wheel A upon the periphery of cord pulley F or
upon the cord in the groove of the said wheel, the bearing pin f of the pulley being
mounted in the bearing hole c¹, formed in the said portion C of the fixed bracket.
The endless cord G thus hangs loosely over its pulley as shewn in Figure 1, but is
gripped elastically between the peripheries of the rubber wheel A and the pulley F.
Upon pulling one of the lengths of the cord the pulley F is rotated but by my said
improvements it will not run off by the weight of the blind when the cord is released,
by reason of the pressure of the small wheel acting as a drag upon the pulley.
As a modification of my said Invention a feather spring H as shown in Figure 3
or an equivalent arrangement of spring, may bear down upon the top of the arm B¹
so as to cause the small drag wheel A to bear with elastic pressure upon the pulley F or
upon the cord lying in the groove thereof; with this arrangement the pinching or
regulating screw may be dispensed with as shown.

page_text: I do not limit myself to the use of India Rubber as the material of which the small
wheel is made, as any other similar material may be employed and I may use a wheel
of wood or metal, covering its periphery with india rubber or similar material, I might
however use such a wheel without any elastic material when a spring is employed as
described with reference to Figure 3.
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 :-
In roller blind fittings the drag wheel A, or the mechanical equivalent of the said
wheel, in combination with the cord pulley F and constructed and mounted sub-
stantially as and for the purposes hereinbefore described and shown upon the
accompanying drawings.
J. H. JOHNSON, DAY & JOHNSON,
115, St. Vincent Street, Glasgow,
Petitioner's Agents.