Improvements in Window Blind Apparatus.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Window Blind Apparatus.
I, WILLIAM MCLAREN, of Moorgate Works, Moorfields, in the City of
London, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to window blind apparatus of the kind described in the
Specification of Letters Patent No. 18318 of 1892 and in which means are provided
for winding or regulating the power of the spring in the blind roller from the
outside.
The means described in the said specification for effecting this regulation are
applicable to blinds mounted in brackets projecting from the face against which
the blind is fixed in such a manner that a cap upon one of the brackets can be
removed; the object of this invention is to provide means whereby the regulation
of the springs of blinds fixed within the casing of a railway carriage or in other
position difficult of access may be effected without the necessity for removing the
blind or interfering with its fixing in any way.
According to my present invention instead of employing a cog or ratchet wheel
upon the end of the loose spindle and a pawl engaging therewith, as described in
the said specification, I arrange a worm wheel upon the said spindle and in the
bracket of the blind I mount a worm the spindle of which is at right angles with
the axis of the blind roller and projects forwardly so that it can be engaged by a
key to permit of rotating the worm and consequently also the said loose
spindle.
Dated the 25th day of Fehmen 1000
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
ements in Window Blind Apparatus.
I, WILLIAM MCLAREN, of Moorgate Works, Moorfields, in the City of
London, 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 :-
My invention relates to window blind apparatus of the kind described in the
Specification of Letters Patent No. 18318 of 1892 and in which means are
provided for winding or regulating the power of the spring in the blind roller from
the outside.
The means described in the said specification for effecting this regulation are
applicable to blinds mounted in brackets projecting from the surface against which
the blind is fixed a removable cap being applied to one of the brackets. The
object of this invention is to provide means whereby the regulation of the springs

page_text: of blinds fixed within the casing of a railway carriage or in other position difficult
of access may be effected without the necessity for removing the blind or interfering
with its fixing in any way.
According to my present invention instead of employing a cog or ratchet wheel
upon the end of the fixed spindle and a pawl engaging therewith, as described in
the said specification, I arrange a worm wheel upon the said spindle and in the
bracket of the blind I mount a worm the spindle of which is at right angles with
the axis of the blind roller and projects forwardly so that it can be engaged by
a key to permit of rotating the worm and consequently also the fixed spindle.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which :-
Figure 1 is a front elevation of a casing containing a blind the spring of which
is adapted to be adjusted according to my invention.
Figure 2 is a front sectional elevation shewing the blind within the casing and
the adjusting mechanism :
Figure 3 is a section on the line 3-3 Figure 2.
a is the casing of the blind and 6 is the door or removable front portion of the
said casing. c is the blind roller and d is the fixed spindle of the same to which
one end of the spring within the roller is attached the other end being attached to
the roller itself. e is the worm wheel fixed upon the end of the spindle d and fis
the worm engaging with the said worm wheel the said spindle being at one end
mounted in a bracket h and at the other end in the front plate i of the blind fitting,
the said front end being made hollow to receive a key as indicated at j, Figures 1
and 3, or otherwise suitably arranged so that it may be rotated in one direction or
the other by means of a key introduced through an aperture k in the front of the
casing.
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:-
1. In spring roller blind apparatus the combination with the spindle to which
one end of the spring is fixed of a worm wheel and a worm engaging with the said
worm wheel and designed to be operated from the front of the casing in which the
said blind is enclosed, substantially as described.
2. The combination in spring roller window blind apparatus of a worm wheel and
worm constructed and arranged substantially in the manner herein before described
and illustrated in the accompanying drawing and operating as, and for the purpose,
set forth.
he 25th day of November 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.