Improvements in Spindles or Rods for Spring Blind Rollers.
Year: 1894

page_text: Date of Application, 28th July, 1894
Complete Specification Left, 27th Apr., 1995-Accepted, 1st June, 1895
PROVISIONAL SPECIFICATION.
Improvements in Spindles or Rods for Spring Blind Rollers.
I, JAMES ROBERTSHAW, of Churnett Street, Manchester, in the County of
Lancaster, Windowblind Manufacturer, do hereby declare the nature of this
invention to be as follows:-
It relates to all spring blind rollers in which a spiral or coil spring coiled round
a central spindle or rod is used, and consists of a method of overcoming or obviating
the friction of the spring on the rod or spindle during the process of tightening.
At present the coil spring is liable to unduly tighten at a point more or less distant
from the point of rotation, the effect of this being to practically render useless all
that portion of the spring that is beyond the tight place and strain or even break
that portion which remains free to act.
I overcome this difficulty by passing the spindle or rod through two or more
short tubes of suitable material, which remain between the spindle and spring
preventing them from coming into direct contact, and which continue to rotate
upon the spindle after the spring has tightened upon them unduly in any place,
thus utilizing the full power of the spring and preventing any straining or
breakage.
Dated this 27th day of July 1894.
JOHN HENRY TOPHAM,
98ª, Market Street, Manchester, Agent to Applicant.
COMPLETE SPECIFICATION.
Improvements in Spindles or Rods for Spring Blind Rollers.
1, JAMES ROBERTSHAW, of Churnett Street, Manchester, in the County of
Lancaster, Windowblind Manufacturer 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 :-
It relates to all spring blind rollers in which a spiral or coil spring coiled round
a central spindle or rod is used, and consists of a method of overcoming or obviating
the friction of the spring on the rod or spindle during the process of tightening.
At present the coil spring is liable to unduly tighten at a point more or less
distant from the point of rotation, the effect of this being to practically render
useless all that portion of the spring that is beyond the tight place and strain or
even break that portion that remains free to act.
I overcome this difficulty by passing the spindle or rod through two or more
short tubes of suitable material, which remain between the spindle and the spring
preventing them from coming into direct contact, and which continue to rotate
upon the spindle after the spring has tightened upon them unduly in any place,
thus utilizing the full power of the spring and preventing any straining or
breakage.
In order that the foregoing may be better understood I send herewith a sheet of
drawings in which is shown a longitudinal section of a portion of a spring blind
roller fitted with my improvements.

page_text: a indicates the blind roller, in cylindrical cavity b is placed the rod or spindle c
attached to and encircling which is coil spring d. Upon the rod or spindle c are
tubes e e upon which the coil spring d tightens as the blind is lowered. It is
evident that if the coil spring d tightens unduly upon any of the tubes e
rotation will not be stopped as the tube e will rotate upon the spindle c thus
tightening the whole spring equally and preventing straining or breakage.
its
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 :-
In a spring blind roller, two or more short tubes interposed between the coil
spring and the central rod or spindle to prevent straining or breakage of the spring,
substantially as described and shown hereinbefore and in the accompanying
drawing.
Dated this 26th day of Anvil 1805
JOHN HENRY TOPHAM,
98ª, Market Street, Manchester, Agent to Applicant.