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Патент USA US3089674

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May 14, 1963
H. FABER
_
3,089,664
MECHANISM FOR AUTOMATICALLY BLOCKING
A LIFTING ROLLER I
Filed June
ENETIAN BLINDS
, 1960
INVENTOR
HARRY FABER
BY W.
,:
ATTORNEY.
llnite States
~"' arent
‘a
i‘
ice
1
3,089,664
Patented May 14, 1963
2
In the drawing,
3,089,664
MECHANISM FOR AUTOMATICALLY BLOCKING
A LIFTING ROLLER IN VENETIAN BLINDS
FIGURE 1 is a side elevation of a mechanism em
bodying a preferred :form of my invention, with the
Harry Faber, Ryslinge, Denmark, assignor to A/S Chr.
blocking member in its inactive position,
Fabers Fabriker, Ryslinge, Denmark
Filed June 16, 196i), Ser. No. 36,553
blocking member in its active position, and
FIGURE 2 is a similar side elevation, but with the
FIGURE 3 is an enlarged sectional view on the lines
III—'III of FIGURE 2.
Between two transverse walls 2 and 4, which are ?x
My invention relates to a mechanism for automati 10 edly positioned in a head rail '5 of a Venetian blind, there
cally blocking a roller for a lifting cord or a lifting band
is disposed a roller 6 for a lifting cord or a lifting band,
in a Venetian blind.
such as a steel band 8. This band is attached below
In many cases the raising of a blind is eiiected in
to the bottom rail of the blind, not shown, and is passed
the way that two or more lifting cords or lifting bands
up through apertures in the blind slats, not shown, and
are connected with the bottom rail of the blind, and 15 through an aperture 9 in the bottom of the head rail 5
from there are passed upwards through apertures in the
into the space between the partitions 2 and 4, where it is
individual blind slats, placed vertically one above an
wound on the roller 6, which is ?xedly disposed on a
other, and in the head rail of the blind are passed over
longitudinal shaft, such as a hexagonal shaft 10, by the
a corresponding number of rollers, on which the cords or
rotation of which the blind can thus be raised and
bands are wound, and which are positioned on a com 20 lowered.
mon horizontal shaft, which is mounted in the head rail
The roller 6 has an annular recess 12., which is open
and by some operating mechanism rotated in one direc
towards the plate 2, and wherein a blocking member 14
tion or the other to effect raising and lowering, respec
with arched lateral arms 16 and 18 is loosely disposed,
tively, of the blind.
said arms having a certain radial clearance in the recess
When Venetian blinds are lowered, especially larger 25 12. The blocking member 14 is locked against move
ment in the peripheral direction of the roller 6 by means
ones, as e.~g. those used for shop windows, it may happen
that the bottom rail of the blind strikes against an ob
of a projection Ztl, which is radially displaceable in an
struction, so that one or more of the cords or bands
aperture 22 in the surface of the roller 6. Furthermore,
are relieved of their weight and by continued unwinding
the blocking member 14 has a stop 24, protruding in the
from the lifting roller become entangled with other 30 axial direction of the roller ‘6. The plate 2 is provided
things or with themselves or are otherwise disarranged.
with a central opening 26, which has such a size and
shape that the roller 6 with the blocking member 14
This is especially so, when steel cords or steel bands,
which among other things may easily kink, are used
and the stop 24, provided thereupon, may ‘freely com
‘for raising the blind.
plete a full rotation, when the blocking member 14 is in
Attention has already before been ?xed on this prob 35 (the innermost position shown in FIG. 1. When on
the contrary the blocking member occupies the outer
lem, and several securing mechanisms have been suggested
most position shown in ‘FIGS. 2 and 3, the stop 24 will
in the form of blocking members, which operate when
strike against a radial facing or ledge 28 at the outer
the cords or bands are relieved and arrest the continued
lowering movement of the lifting roller. Such blocking
most edge of the aperture 26 and thereby prevent a con
members have been brakes or stops, which are kept in
tinued rotation of the blocking member 14- and conse
quently of the roller v6.
inactive position by the tight cord or the tight band, but
The mechanism works as follows. During normal
are put into active position under the in?uence of a com
lowering of the blind with ‘the band tightened as shown
pression spring or a tension spring when the cord or
in FIG. 1 by anticlockwise rotation of the shaft 10, the
band is relieved, and prevent a continued movement of
the roller in the lowering direction, until the obstruction, 45 band 8 which is tightly wound on the roller 6 will force
the projection 20 inwards and thereby keep the block
which caused the cord or the band to be relieved, has
been removed, and the cord or band again tightens.
ing member 14 with the stop 24 in vits innermost posi
Claims priority, application Denmark June 19, 1959
2 Claims. (Cl. 2.42—99)
The said known securing mechanisms have proved to
tion, shown in FIG. 1, whereby the blocking member 14
possess the substantial disadvantage that they are not
is rotated together with the roller 6, the stop being un
operationally reliable on account of the springs used,
obstructed in its rotation. If the part of the bottom rail
which partly are exposed to damage, partly lose their
of the blind, which is carried by the band 8, strikes
spring power in the course of time or because of deposits
against any obstruction during the lowering, the band 8
of dirt.
is relieved, and this relief is immediately transmitted
The primary object of the present invention is to
to the windings on the roller 6, which on the lowermost
remedy the above mentioned drawback by providing a 55 side of the roller 6 move away from its surface. When,
mechanism, which is so positioned that it is not exposed
therefore, during its rotation with the roller 6 the block
to damage. Another object is to provide a mechanism
ing member 14 for the ?rst time following arrives in its
which preserves its operational reliability irrespective of
lowermost position as shown in FIGS. 2 and 3, it will by
the passing of time.
its ‘own weight fall down into its outermost position, in
Still another object is to provide a reliable mechanism,
which the stop 24 will strike the ledge 28 and thereby
in which the force necessary to move the blocking mem
prevent a continued rotation of the roller 6 and con
ber into its active position is always present in the form
sequently of the shaft 10, so that the ‘operator’s atten
tion is turned to the obstruction, which can be removed,
and thereafter without hindrance the roller 6 may-if
necessary after having been turned slightly back in order
to tighten the band 8 and the abutment of the band wind
ings against the roller—-be turned ‘again in the direction
corresponding to lowering, the blocking member be
ing then forced into its inactive position as shown in
FIG. 1.
The mechanism according to the invention also op
of the own weight of the member.
A further object of my invention is to provide a mech
anism including a blocking member which is well and
safely guided in its movements.
A still further object is to provide a mechanism which
is well protected against dirt and damage.
Other objects of my invention will appear ‘from the
following description taken in conjunction with the ac
companying drawings, which describe and show my in
vention by way of illustration.
erates to prevent a continued rotation of the shaft 10
3,089,664
4
3
I claim as my invention:
and consequently of the roller 6, when the bottom rail
of the blind has arrived in its lowermost position, which
1. In a mechanism for automatically blocking a rol
ler ‘for a lifting band of a Venetian blind, comprising a
may be determined by a window sill or a ?oor under
lifting band, at least one facing member, a roller posi
tioned in said facing member and having a circular
the window or by the length of the ladder tape of the
blind, in which case the band 8 is also relieved. The
mechanism may be placed at each of the lifting rollers
recess in one of its ends, a ?xed stop on said facing
of the blind or at one or several thereof, preferably the
member, a blocking member displaceable inwardly by
said band when wound on said roller and in outwardly
radial direction with respect to said roller to cooperate
Even if the mechanism according to the invention is of
particular importance for larger Venetian blinds, e.g. 10 with said ?xed stop when the band is relieved, and slid
two outermost rollers on the blind.
ably movable into blocking position solely by the action
of its own weight, said blocking member being loosely
blinds for shop windows, where it is often impossible
from the place of operation to watch the movement of
the blind during lowering, it is also with great advantage
useful for smaller blinds, where obstructions in the
disposed with a certain radial clearance with respect to
said roller in said recess and positioned beneath the
lowering path of the blind may as well occur, which may 15 surface of said roller face, said recess being shaped as a
circular arc and being concentrical with the axis of said
disarrange the lifting band.
roller, and lateral arms shaped as circular axis on
The mechanism according to my ‘invention may be
said blocking member and having a. projection guided in
altered in many ways without departing from the in
an aperture in the roller face, a stop on the blocking
vention. Thus, it is not necessary that the lifting roller
be positioned between transverse walls, one of which 20 member protruding in the axial direction of the roller,
said last mentioned stop striking against said ?xed stop
in the outermost position of the blocking member clear
of the same in the innermost position thereof.
2. In a mechanism according to claim 1, said facing
The main thing is that the blocking 25 member comprising a radial ledge on the lowermost part
forms the facing for the stop on the blocking member,
but said stop may be arranged to cooperate with any
other suitable ?xed facing. The blocking member may
also have a shape and position different from those shown
in the drawing.
of an otherwise circular outermost edge of an opening
member solely by the action of its own Weight can move
in said facing member and said facing member abutting
into its active blocking position. It is natural that the
on one end face of the roller.
blocking member should have a certain weight, but
precisely this fact in connection with the very simple
construction produces a robust mechanism, which will 30
References Cited in the ?le of this patent
stand undamaged even the roughest treatment, to which a
UNITED STATES PATENTS
Venetian blind may be exposed in operation.
It is to be understood that various other modi?cations
and departures from the construction described may be
made; and I do not wish in any way to limit myself to 35
the exact details and mode of operation set forth in
this speci?cation and drawing, for it will be obvious that
wide departure may be made without departing from the
spirit and scope of my invention as set forth in the ap
pending claims.
40
43,294
2,071,941
2,105,469
2,954,940
2,982,492
2,990,131
Dalton _____________ .._ June 28,
Flaws _______________ __ Feb. 23,
Bosch _______________ __ Jan. 18,
Herrrnann ___________ __ Oct. 4,
1864
1937
1938
1960
Spielman ____________ __ May 2, 1961
Carlsson _____________ __ June 27, 1961
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