Improvements in Apparatus for Raising and Lowering Window Blinds.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Raising and Lowering Window
Blinds.
I, BRICE TYDEMAN of Syndale House Cecil Road, Plaistow in the County of
Essex, Engineer, do hereby declare the nature of this invention to be as
follows:-
The object of the invention is to balance window blinds in all positions whether
they are lowered or raised so that the raising or lowering can be effected with the
greatest ease and the blind can be held without any fastening in any position that
it may be pulled to.
In the case of an ordinary Venetian blind the usual cords by which the blind is
drawn up or lowered are as heretofore led to one side of the upper part of the
window and after being led downwards over guide pulleys are attached to a single
cord which is led away and wound around and secured to a helically grooved cone
or to a barrel which has fast with and concentric with it a second helically grooved
cone to which one end of a second cord is attached the other end of this cord
carrying a balance weight.
The cords are wound on to the cones or cone and drum in such directions that
when one is wound up the other is unwound.
Preferably I employ two grooved cones. When the blind is fully drawn up and
the whole weight of the blind requires to be counter-balanced the cord which
carries the balance weight would hang down from the largest circumference of its
cone-whilst the other cord passing away to the blind would be fully wound up on
to its cone and would pass off from its smallest circumference. In this way a
comparatively light balance weight is sufficient to balance the weight of the
blind.
The spindle of the two cones or cone and drum is mounted in bearings carried
by a bent metal plate which can be fixed by screws in any suitable position. If
secured at one side of the upper part of a window the cord passing to the blind
would be led downwards and around a pulley near the bottom of the window and
then be secured to the two blind cords. The second cord having the balance weight
suspended to it would hang down at the side of the window.
The cords as they pass off from the cones may be led over guide pulleys
which can traverse to and fro along a spindle parallel with the spindle of
the cones.
Similarly the apparatus might be fixed at the lower part of a window or in other
suitable position.
If used for balancing an ordinary roller blind the cords would be wound on to
the cones in such a way that the action would be reversed that is the balance
weight would be acting with greatest effect when the blind was drawn down.
Dated this 25th day of November 1895.

page_text: Improvements in Apparatus for Raising and Lowering Window
Blinds.
I, BRICE TYDEMAN, of Syndale House, Cecil Road, Plaistow, in the County of
Essex, Engineer, 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 the invention is to balance window blinds in all positions whether
they are lowered or raised so that the raising or lowering can be effected with the
greatest ease and the blind can be held without any fastening in any position that
it may be pulled to.
In the case of an ordinary Venetian blind the usual cords by which the blind is
drawn up or lowered are as heretofore led to one side of the upper part of the
window and after being led downwards over guide pulleys are attached to a single
cord which is led away and wound around and secured to a helically grooved cone
or to a barrel which has fast with and concentric with it a second helically grooved
cone to which one end of a second cord is attached the other end of this cord
carrying a balance weight.
The cords are wound on to the cones or cone and drum in such directions that
when one is wound up the other is unwound.
Preferably I employ two grooved cones. When the blind is fully drawn up and
the whole weight of the blind requires to be counter-balanced the cord which
carries the balance weight would hang down from the largest circumference of its
cone whilst the other cord passing away to the blind would be fully wound up on
to its cone and would pass off from its smallest circumference.
In this way a comparatively light balance weight is sufficient to balance the
weight of the blind.
The spindle of the two cones or cone and drum is mounted in bearings carried
by a bent metal plate which can be fixed by screws in any suitable position. If
secured at one side of the upper part of a window the cord passing to the blind
would be led downwards and around a pulley near the bottom of the window and
then be secured to the two blind cords. The second cord having the balance
weight suspended to it would hang down at the side of the window.
The cords as they pass off from the cones may be led over guide pulleys which
can traverse to and fro along a spindle parallel with the spindle of the cones.
Similarly the apparatus might be fixed at the lower part of a window or in other
suitable position.
If used for balancing an ordinary roller blind the cords would be wound on to
the cones in such a way that the action would be reversed that is the balance
weight would be acting with greatest effect when the blind was drawn down.
The drawing shows an apparatus made in accordance with this invention.
a and b are two helically grooved cones made in one piece and mounted on a
spindle c carried in bearings d.
e and fare two guide pulleys which can traverse to and fro along the spindle g,
a cord h wound in the grooves on the cone a and attached to it at i passes under
the guide pulley 7 and then upwards to the blind cords of a Venetian blind or to
the roller of an ordinary blind. With the cords in the position shown in the
drawing a Venetian blind would be fully pulled up and an ordinary blind would
be fully pulled down. Another cord k attached to the other cone 6 passes over
the guide pulley f and is attached to a counter-balance weight not shown in
the drawing
The great advantages which my apparatus possesses over any balancing

page_text: arrangements which have before been proposed are that it takes little space and
that it can be applied to existing blinds without necessitating any alteration.
whatever in them. The same apparatus can be used for other analogous.
purposes.
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. The combination of two cones (or a cone and a drum) with two cords wound
upon them one cord being the ordinary blind cord or forming a continuation of it
and the other having a balance weight attached to it.
2. Apparatus for raising and lowering window blinds substantially as described
and shown in the drawing.
B. TYDEMAN.