Improvements in Venetian and other Blinds.
Year: 1892

page_text: ate of Application, 6th Jan., 1892-Accepted, 30th July, 1892
COMPLETE SPECIFICATION.
Improvements in Venetian and other Blinds.
CARL GUSTAV CHRISTENSEN of 22 Prindsens Gade, Christiania, in the
Kingdom of Norway Blind Maker, 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 Venetian and roller blinds. My said invention comprises
mechanism for automatically lifting and fixing the blinds in any desired position,
and in case the invention is applied to Venetian blinds use is made of a peculiar
device for adjusting the position of the slats.
In the accompanying drawing which shows a Venetian blind I have shown how
my said invention may be conveniently and advantageously carried into practice.
Figure 1 shows the improvement applied to a Venetian blind, which is let down,
with the slats horizontal."
Figures 2 to 5 are side elevations of the Venetian blind showing the slats in
various positions.
Figure 6 is a sectional plan of the upper part of the blind.
Figure 7 is a plan partly in section and
Figure 8 is a longitudinal section of the same.
Figure 9 is a section on the line y y of Figure 7.
Figure 10 is a section on the line zz of Figure 7 and
Figure 11 is an end view of the said upper part of the blind.
The improved Venetian blind comprises an upper part A and a lower part B,
which are connected with each other by means of the vertical bands or tapes C
(Figure 1). The upper part A forms the essential part of the present improve-
ment. It consists of a wooden rod or bar formed with a cavity A' in which the
shaft b is supported in bearings 66. At either end of the shaft bare secured
the cord pulleys E upon which the cords e (Figure 8) are wound when the shaft b
is turned.
The turning of this shaft is effected automatically by the spiral springs d coiled
round the shaft b, and one end of which is fastened to the shaft and the other end
to the holder d¹ (Figure 6). The holder d¹ is adapted to be displaced upon the
shaft & so that the spring d can be put under tension according to requirements.
For this purpose I provide in the sides of the cavity A¹ semicircular recesses a a
opposite each other, and in the holder a semicircular annular groove d³, Figure
into which the locking piece G may be inserted when the holder d' is so displaced
upon the shaft that the annular groove & corresponds with two opposite
recesses a.
The piece G thus enables the position of the holder d¹ and with it the tension of
the spring d (Figure 9) to be adjusted.
For enabling the Venetian blind to be held in the various positions I arrange on
one end of the shaft b a small ratchet wheel H (Figure 9) which is furnished with
two notches with which engages the pawl i adapted to turn on the bearing & for
the shaft b.
The catch is operated in such a manner that when the blind is to be lifted, the
cord F is given a slight pull downwards by which the catch i is brought out of the
notch, the side of the said notch being made inclined to conform with the corre-
sponding side on the tooth of the catch. If the cord is now set free the blind will
be quickly raised under the action of the spring, the ratchet disc H being rotated
at too great a speed to allow of the catch i engaging the notches h. If however the
upward movement of the blind is checked by means of the cord the catch will
engage with one of the notches and hold the said blind in any desired position.
PQ77

page_text: In order that the cord e shall pass at right angles to the axis of the blind I
arrange below the cord pulleys E a small roll (Figures 9 to 11) over which the
cord is conducted. The arm' carrying the small roll k is secured to the upper
part A.
To the extremities of the upper part A are fixed the plates L provided with the
journals (Figures 5 and 11) which are concentric with or eccentric to the upper
'part, so that the said upper part A can turn with these journals in holes of the
window frame. The turning of the upper part A and with it the adjustment of
the slats is effected by means of the double belt M connected to the disc L
(Figure 5) and in which the chain m is included so that by hooking a higher or
lower link of this chain to a pin arranged on the side wall of the window the
turning of the upper part and therefore the position of the slats may be adjusted
(Figures 2 to 5).
The slats D D Figure 5 are placed between double cross bands or tapes c which
are connected with the longitudinal bands or tapes C in any suitable manner.
The slats may be made of wood as represented at the lower part of Figure 5 or
in lieu thereof use may be made of cloth strips D, as shown at the upper part
of Figure 5. The lower part B is furnished at its under side with a rib o to
which is attached the cord F for pulling down the blind. By arranging the rib o
on the lower part B the latter is stiffened and strengthened while it is made
extremely light. The cavity in the upper part A is closed by a cover A*
(Figure 10) so that the enclosed mechanism is protected from dust.
If with the upper part A is connected a blind made of fabric, it will not be
necessary to provide the upper part with the lateral plates L and to arrange it to
turn, as an adjustment of the blind in its several parts is not required.
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 :-
First. In self-lifting Venetian and roller blinds the employment of an upper
part (A) provided with a cavity (A') in which is supported a shaft b which tends
to turn under the, pressure of a spiral spring the said shaft carrying at one end a
ratchet wheel (H) with which engages a pawl (i) for enabling the blind to be
fixed at any height, the blind, when it is used as a Venetian blind being connected
with the lower part (B) by longitudinal double bands or tapes each of which is
again connected by cross bands (c Figures 2 to 5) between which the slats are
inserted.
Second. In the Venetian blind as above described the supporting of the upper
part (A) so that it can turn, and the arrangement of an adjusting belt (M) on the
same while the shaft (b) situated in the interior of the said part A is furnished with
cord, pulleys (E).
Third. In the Venetian blind as above described the arrangement of journals (1)
concentric with or eccentric to the ends of the upper part, so that the upper part
when at rest occupies a horizontal or an inclined position.
Fourth. In the Venetian blind as above described, the arrangement of double
cross bands c between which the slats are inserted.
Fifth. In the Venetian blind above described, the arrangement of a longitudinal
rib (o) on the under side of the lower part (B) for strengthening the same.
Dated this 6th day of January 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.