Improvements in the Construction of Venetian Blinds.
Year: 1889

page_text: Date of Application, 30th May, 1889-Accented, 13th July, 1889
COMPLETE SPECIFICATION.
Improvements in the Construction of Venetian Blinds.
I, CHRISTIAN ALBERT JENSEN, of 77, Chancery Lane, in the County of London,
Patent Agent, 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 (a communication to me from abroad by A. Grönbeck, of
Christiania, Norway, Agent):-
This invention consists in improvements in the construction of venetian blinds
chiefly with the object of reducing the cost of manufacturing such blinds and of
making them more durable and also to simplify the construction, so that the blinds
may be repaired more easily and with much less expense.
With reference to Fig. 1 on the annexed drawing, which shows the construction
of a blind as it is now generally made, it will be seen that the laths or slats 6 of the
blind are laid between two tapes R and R' and are supported by means of cross-
tapes r, which are often woven in one piece with the vertical tapes R, R', the latter
being secured at the top to an adjusting bar B, which is hung on rollers a, in the top
board A, by means of a tape or ribbon C. The bar B is adjusted in different positions
by means of the cords c, c¹. Now it will be easily understood, that the cost of the
blinds is, very much increased by using the expensive tapes R, R', r, which must be
manufactured especially for the purpose, and it is also very disadvantageous as the
outside ribbon Ri being constantly exposed to the sun very soon becomes destroyed.
To repair the blind the whole tape ladder or ribbon R, R', r, has to be replaced by a
new one, at considerable expense.
The invention consists in doing away with the tape ladders R, R¹, r, and the
adjusting bar B and in lieu thereof hanging the laths of the blind on a single tape
or cord, the latter being fastened to the top board of the blind, which is secured to
the window frame and in order to put the laths in different positions or angles a cord
is employed, which is tied or otherwise secured to each of the laths and is run over a
roller in the top-board and down by the side of the window.
The invention is illustrated on the annexed drawings, where Fig. 1 shows a front
elevation of the upper part of a blind, Fig. 2 a vertical cross-section of the same,
Figs. 3, 4, and 5 are details.
From the back or inside of the top-board A extends a ribbon or tape 1, and on
this ribbon are secured hinges M, made of a piece of wire, and inserted into a hook 3,
formed on a thin plate 4, nailed to the laths b. On the front side of the laths holes 5
are provided, and a cord or chain 6 is run on this side of the blind and tied or other-
wise secured to the laths, being passed through the said holes as shown in the
drawings; but instead of tying the cord in this way, the cord may be simply passed
through the holes and a knot made on the cord underneath the laths.
This cord is laid over rollers 7 in the top-board A of the blind, and is carried to
one end of this top-board, running over a roller 8, comes down by the side of the
window, and serves to regulate the angle of the laths of the blind. The cord or
chain 9, whereby the blind is drawn up, is arranged in the usual manner, being
passed through the holes 10 in the laths and. over rollers 11 in the top-board.
Figs. 3 and 4 show part of the laths in front and rear elevation, the holes 5 being
here shown arranged in a small piece of metal 51, which is rivetted or otherwise
secured to the laths, an arrangement which I sometimes prefer. Fig. 5 shows the
hook-plate in section.
As will be seen there will be no ribbon exposed to the sun by the above described
construction, as the ribbon 1 is placed on the inside of the blind; but the use of a
ribbon may be altogether avoided by using a cord also on the inside of the blind instead
of the ribbon 1, and the laths may be secured to this cord in the same way as to the
5

page_text: regulating cord, as hereinbefore described. It will also be seen that by this con-
struction the use of a regulating bar, B Fig. 1ª, is also avoided, reducing the cost of
the blinds, in short by the above described construction the cost of the blind is
reduced about one half.
Instead of using a tape or ribbon 1 it is evident that a cord or chain may be
eniployed which may be secured to the laths or slats in any suitable manner.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
1. The improved construction of venetian blind in which the laths or slats are hung
on ribbons tapes or cords on the inside being secured thereto by hinges or otherwise
and are united on the outside by means of a cord or the like, such cord also serving
to regulate the angle of the laths substantially as described and shown.
2. The constructions of venetian blinds as shown with reference to Figs. 1, 2, 3, 4,
and 5.
of May
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.