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Dec. 31, 1946.
|_, SQRRENTINO '
2,413,471 I
COUNTERWEIGHT DEVICE FOR ROLLER CURTAINS
~
Filed Nov. 2, 1943
4 Sheets-Sheet 1
_
.
E;
"Ma
I
/
JW ? n17”,
311mm,
Dec. 31, 1946.
L. SORRENTINO
~ 2,413,471
vCOUNTERWEIGHT DEVICE FOR ROLLER CURTAINS
Filed Nov. 2, 1943
4 Sheets-Sheet 2
L
Dec. 31, 1946.
'
|_, SORRENTINO
I
2,413,471
COUNTERWEIGHT DEVICE FOR ROLLER CURTAINS
Filed Nov. 2, 194-3
4 Sheets-Sheet 5
Elthnwmd
Dec- 31,1946-
|_. SORRENTINO I
2,413,471
COUNTERWEIGHT DEVICE FOR ROLLER CURTAINS
Filed Nov. 2, 194a
'
"
4 Sheets-Sheet 4
2,413,471
Patented Dec. 31, 1946
UNITED STATES PATENT OFFICE
COUNTERWEIGHT DEVICE. FOR) ROLLER .
CURTAIN S '
Luis Sorrentino, Buenos Aires, Argentina.
ApplicationNovember 2, 1943, Serial n10-50839
7- Claims. '
(Cl.'160—--33)
1.
This invention ‘relatesto a‘ counterweight de
vice for roller curtains, and more particularly
to a counterweight device for facilitating the op
eration of opening and closing blinds and the
like.
Several elements andv devices have been sug
gested and. to a certain extent used heretofore for
the'purpose of compensating the'weight of. the
curtain~during the action-thereof, but‘ inasmuch
as" such» devices are generally constituted by
springs or‘ simple counterweights, they onlycoun
teract theweight in certain’ positions of-‘the blind.
Thus, in the caseof relativel'ylarge roller cur
tains,» it is‘necessary to use'a reductioncontrol,
in the way of combination apparel capable of
multiplying» the forces with less speed in' order to
mum effort to open and ‘close the blind,» andlalso
to graduate and regulate the slats thereof, since
thesecondary spiral of said pulley isarranged
so, as to act‘ between the positions of maximum
spacing. or light and. of juxtaposition of, said
slats.
A further object of the invention is to simplify
the. counterweight and .control mechanism with
out vrequiring special. installations.
.
Astill further object‘of theinvention isto pro
vide a deviceoithe kind mentionedlabove, which
will render safe the operation of the blind in any
position thereof, for which purpose-the control
of the device is provided with a crank handle
’ which, on being placed in inoperative position ‘will
lock the entire. mechanism. .
The. above andotheri objects and‘ advantages
of
the present invention will‘ become apparent
Actual experiments have shown-.that in order
from the course of the following. description,
to obtainthenecessary equilibriumv of the coun
terweight relative to the curtain, it‘ is'necessary 20 when read in'conjunction with the accompanying
drawings illustrating the; invention by way of ex
that‘ the pulley with which the weight is asso
ample and in a preferred embodiment.
ciated, shouldvha-veia variable radius, and this is
In the‘ drawings:
achieved by means of the present invention.
Fig; 1‘ is a' front View of'the blind in open posi
The device of the present invention comprises‘
av pulley’ counterweight mechanism- wherein‘ the " tion, showing the manner in which same is com
overcome the resistanceoft'the‘blind or curtains.
winding base of the pulley is- constituted by a‘
spiral groove orv channelthe radius of which in
creases gradually fromia'lminimumi section to the
maximum periphery “thereof ; andiagain decreases
on the opposite facethercof', but’ with a shorter
turn capabl‘eofj presenting a’ substantial diiier
enceirelative tothe' path of‘the channel corre-
sponding'tothe main facev thereof;
saidipulley is‘ so combined that while it1 is ?xed'
bined with the’ counterweightdevice.
Fig. 2 is a side View showing the weight de
pending from the channel of smaller section of
, the pulley.
,
Fig. 3' is‘ a View similar to Fig. 1 but showing
the blind in closed position, with the slats in
spaced relation, at which time the weight of. the
counterweight device is acting on the maximum
turn of the spiral.
.
Fig. Zl'shows the same blind'in fully closed posi
tion,
viz; with the slats juxtaposed and the weight
therewith, in sucha' manner that‘ the weight act
thereof ‘counterbalanced by the counterweight de
ingxby means of its cable in said channel of the
pending from the secondary spiral of the pulley.
pulley, willbehave as an element of substantially’
Fig; 5’is a cross-sectional view of‘ the winding
variable power; depending on the position in
which. said. weight is hanging, since the lever 40 ‘drum, taken along the line N——N of Fig. 4.
Fig. 6 is a front view of the control device of
radius'will be larger‘ orv smaller according t'o'~=the
the
curtain, with the rosette of'the crank par-_
direction ofzrotatioin Inasmuch as-the diameter‘
tially‘broken away so as to show the diiierent
of the'pulley: is calculated in accordance with the
:locking points; and
weightzofi the icurt'ainto' which the counterweight
Fig. 715 a cross-sectional View of the same con
device is‘ applied‘, this will" ensure a substantially
trol‘d'evicek
stable .equilibrium?n every. position of the cur
The same reference characters are used to in
tain;
'
dicate like’ or corresponding parts or elements
Apart’ from:v the ; foregoing, the" invention‘ conthroughout the different ?gures.
'
templates: other-objects; among‘ whichv may be
torthe winding. drum, it will act‘ in combination‘ ‘
citedythe provision of. a counterweight arrange
ment» of» relative and" graduali equilibrium
throughout the-total ‘opening-p01" closing-positions
0f:the.blind.
.
.
Arfurther objectfof theinventioniis torprovid'e"
direct controlimeans‘whichxwill requirea mini~
With reference to the drawings, a'indicates a
blind, which in the present instance is consti
tuted by a plurality of‘ slats i joined‘ together
by link members 2 and forming an» articulated
assembly; which: may be‘ wound‘ on a‘ drum‘ 3 to
whichzonerend‘ioirtheblin‘diis attached, the‘ latter
2,413,471
3
sliding on a guide 4.
4
.
Said drum 3 is ?xed to a
shaft 5 mounted on bearings 6 suitably located at
each side of the frame in which the blind is to
be mounted.
In the fully wound position shown in Fig. 1,
the blind a o?’ers torque relative to the drum 3,
but when the blind is unrolled to the position
shown in Fig. 3, the entire weight thereof de
pends on the radius of said drum thus necessi—
guide the cable with said weight 8 during its
travel by the different channels of both the main
and secondary spirals.
For the purpose of operating the blind, shaft 5
is provided with a bevel gear [3 meshing with a
gear l4 having ?xed thereto a toothed wheel l5
which is connected by means of an endless chain
IS with a control gear Wheel I1.
Said control wheel I‘! is ?xed to shaft [8
tating a counterweight which will counteract the 10 mounted on bearings l9 and 20 located in a box
load throughout‘the opening and closing range
2| of the actuating or control device 0 which is
of the blind. In the position shown in Fig. 3, the
embedded in the wall by means of anchoring
slats remain in spaced relation with each other,v
members 22. Shaft l8 ends in a rosette 23 hav
for ventilation and light purposes. This spacing
ing pivoted thereto a crank 25 by means of pivot
of the slats may be cancelled through the action 15 24, so that upon displacing said crank 25 to the
of the same drum which on further unwinding
position shown in full lines in Fig. 7, it will serve
the blind will cause the juxtaposition of the slats
to
rotate the shaft l8 and, through toothed wheel
I, thus bringing the blind to a fully closed posi
I‘! and chain l 6, said rotary motion will be trans
tion as shown in Fig. 4. In this instance, inas
much as the slats are superposed relative to each 20 mitted to wheel l5, the gear [4 of which will ac
tuate the gear l3 and consequently shaft 5, drum
other, the weight of the assembly will not de
3 and pulley I), thus Winding or unwinding the
pend on the radius of the drum.
blind, depending from the direction in which the
According to the present invention, the curtain
or blind a is balanced by means of the counter
weight device constituted by the pulley b, cable
1 and weight 8. Said pulley b is ?xed to the
shaft 5 so as to act simultaneously with the
drum 3.
As the blind a is closed or opened, the torque
will be greater or smaller, which will depend on
crank is turned.
Upon placing the crank 25 in inoperative posi
25 tion shown in dotted lines in Fig. 7, same is se
cured by means of a button 26 arranged at the
side of a groove 21 provided diametrically on said
rosette 23 so as to accommodate said crank when
the latter is in inoperative position, thereby giV
ing said rosette the appearance of a simple disc.
the portion of the blind depending from the drum
Said groove or recess 21 is provided with a pin
3, and therefore. said device should act in rela
28 passing through the body of said rosette 23
tion to the weight'oifered by the depending por
and urged by a spring 29 so as to project from
tion of the blind.
the
surface of said recess 21. Upon press
For this purpose. said pulley b is spiral-shaped, 35 ing bottom
said pin 28, overcoming the resistance of
having a channel 9 in which the cable 1 is wound.
spring 29, the opposite end 28' thereof will ex
As clearly shown in Figs. 1 to 5. said channel 9 is
tend outwardly of the rosette and enter one. of
spiral-shaped with a helical pitch, that is to say,
the holes 30 provided in a cup shaped element 3|
that said channel 9, from the largest Or maxi
?xed to the box 2| of the control device 0. Said
mum turn 9’ gradually decreases in radius until 40 holes 30 form an annular line. Consequently,
it reaches the smallest or minimum turn 9".
upon placing the crank 25 in inoperative position
Thus, when the Weight 8 depends, through cable
as shown in dotted lines in Fig.7, pin 28 is pressed
1, from the maximum turn 9', said weight will
so that the end 28' thereof will enter one of said
offer an e?ect equivalent to the weight of the
holes 30, thereby locking the rosette against
curtain a in its fully unwound position, and said 45 movement and, consequently, the ‘entire control
channel 9 has a convolution with as many turns
as revolutions the drum must eifect in order to
fully wind or unwind the blind. Thus, when the
mechanism of blind a will be prevented from
moving either for opening or closing the blind.
Thus, the inoperative position shown in dotted
blind is in fully wound or open position, as shown
lines in Fig. 7 constitutes a safe means for look
in Figs. 1 and 2 the cable 1 of weight 8 will be lo 50 ing
the curtain in any position.
cated within that portion of the channel corre
Upon placing crank 25 in operative position as
sponding to the smallest turn 9" so as to be in
shown in full lines in the same Fig. 7, said spring
equilibrium with the blind which oifers substan
tiallv no weight in this position.
29 will act to free the pin 28 from the correspond
ing hole 30, thereby releasing the entire mecha
Apart from the spiral formed by channel 9, 55 nism and placing same in condition to control
said pulley b is provided with a second channel
l0 which extends from the maximum turn 9', de
scribes a short path and ends at I 0’, this latter
spiral channel In constituting an extension oppo
the curtain a by means of said crank 25.
Resuming, said pulley b with the two spiral
channels 9 and l 0, and the associated cable 1 and
weight 8, will act as an automatic regulator so as
site the main spiral channel 9. Thus, channel 60 to maintain a constant counterweight equilibrium
I!) is a secondary spiral but enables the adapta
relative to the curtain a, inasmuch as the torque
tion of cable 1 so as to reduce the torque exerted
olfered by said weight 8 in combination with the
by weight 8 in passing from said maximum turn
pulley, starting from the smallest turn 9" corre
to said secondary spiral.
sponding to the fully wound position shown in
, The secondary spiral determined by channel 65 Figs. 1 and 2, will be gradual and relative up to
l5 serves to reduce the radius arm of the weight
the maximum unwinding as shown in Fig. 3, when
8 on pulley b when the drum 3 is further actu
the
weight of the entire curtain suspended from
ated from the position of the blind shown in Fig.
the radius of drum 3 is compensated by said
3 to that illustrated in Fig. 4 where the slats are
weight 8 which is at this time gravitating on the
juxtaposed and, therefore, cease to gravitate on
maximum
radius of the pulley, that is to say, on
the radius of drum 3 until said gravitation is ?
nally entirely counterbalanced when all the slats _ the turn 9' thereof. However, if the action of
the control mechanism 0 is continued so that the
I..
drum 3 will rotate further in the same direction,
Said cable ‘I is guided on a sheave ll rotatably
mounted on a roll I 2 and slidable thereomisnras to 75 the slats I will superpose, with the consequent
l are superposed.
torque reduction on the radius of drum 3, while
2,41 31,4:71;
5,
6
sai'diholes being» arranged‘ in anannular line con
at~the same time cable ' 11 w~ill' pass- on to the sec
centric- to'th'e axis-of rotation of the rosette, a
onda'ry» spiral of: channel" ID,- in such a- manner
groove-therein, acrank pivoted to the'rosette to
thatvupon/ reaching‘theeportion: Hi’, all the slats
effect‘v rotation of? said second‘ shaft, said crank
I’ will remain superposed-to» each other without
offering any torqueand, therefore, in complete
beihg-adapted'to befolded inisaid groove when'in
inoperative position, a’ spring~urged pin within
equilibrium with thecounterweigh‘t;
said groove out-of engagement with the holes of
ItI-isv evident’ that‘ in'carrying the invention into
practice; several changes-and alterations will oc
said¥cuplwhenthe crank isin operative position,
and? inengagement withone of said'holes when
cur to thoseskilledin the art, without departing
the crank is in inoperative position in said'groove
from the scopeeof the invention as- clearly set 10 and'means'totransmit the rotation‘ of said Sec
forth in the appended claims;
ondishaft‘toithe-winding- drum of‘ theiroller slat
I claim: I
1; A-counter-weight device for a roller slat blind.
mounted on a drum supported by a shaft, the slats
thereof being connected by means permitting sep
aration, said device comprising a spiral pulley
mounted on said shaft, a counterweight depend
ing from a cable windable on said spiral pulley,
the weight of said depending counterweight act
blind.
a. A counterweight device for a roller slat blind
15 mounted on a drum supported by a shaft com
ing over the different radii of said pulley being in
equilibrium with the unwound portion of the
slat blind in the different winding positions there
of on said drum, said pulley having a main spiral
corresponding in increasing radii to the radii of
the winding roll of said slat blind, and a secondary
return spiral continuing from the maximum turn
of the main spiral, the decreasing radii of said sec
ondary spiral corresponding with the transition
from the position of maximum unwinding of the
slat blind with the slats in maximum spaced rela
tion and the bottom slat just touching a support, ,
to the position of juxtaposition of the unwound
slats whereby the weight of the suspended portion
of the blind is substantially counterbalanced by
said counterweight.
2. A counterweight device for a roller slat
blind mounted on a drum supported by a shaft,
the slats thereof being connected by means per
mitting separation, said device comprising a spiral
prising a spiral pulley mounted on said shaft. a
from a cable windable
counterweight depending
the weight of said depend-
'
on said spiral pulley,
ing counterweight acting over the different radii
of said pulley being in equilibrium with the un
wound portion of the slat blind in the different
winding positions thereof on said drum, and a
control mechanism for said drum comprising a
box, bearing members therein, one of said bear
ings being in the form of a cup-shaped member
and provided with holes, a second shaft in said
bearing, one end of said second shaft extending
beyond the exterior face of the cup and terminat
ing in a rosette, said holes being arranged in an
annular line concentric to the axis of rotation of
the rosette, a groove therein, a crank pivoted to
the rosette to effect rotation of said second shaft,
said crank being adapted to be folded in said
groove when in inoperative position, means
mounted in the groove in said rosette and en
gageable in the holes in said cup-shaped member
to lock the second shaft and rosette against ro
tation, means urging said latter means out of
such locking position, said ?rst means being en
gageable by said crank when in an inoperative
pulley mounted on said shaft, a counterweight de 40 position in the groove to force same into the lock
pending from a cable windable on said spiral pul
ing position, and means for transmitting the ro
ley, a sheave for guiding said cable, said sheave
tation of said second shaft to the winding drum
being rotatably and transversely slidably mounted
of the roller slat blind.
on a sheave-shaft, the weight of said depending
5. In a counterweight device for use in control
counterweight acting over the different radii of
ling a winding drum mounted on a shaft and
said pulley being in equilibrium with the unwound
adapted to receive a plurality of serially connected
portion of the slat blind in the different winding
members, a pulley mounted on said shaft, said
positions thereof on said drum, said pulley having
pulley having a pair of spiral grooves therein, one
a main spiral corresponding in increasing radii
of said grooves increasing from a minimum up to
to the radii of the winding roll of said slat blind,
a maximum radius and the other groove decreas
and a secondary return spiral continuing from the
ing from the same maximum down to a minimum,
maximum turn of the main spiral, the decreasing
a cable‘attached at one end to the spiral pulley
radii of said secondary spiral corresponding with
and a counterweight attached to said cable, the
the transition from the position of maximum un
convolutions of one of said spiral grooves on the
winding of the slat blind with the slats in maxi
pulley being adapted to increase the radius arm
mum spaced relation and the bottom slat just
and hence the torque on the shaft as the winding
touching a support, to the position of juxtaposi
drum is rotated to unroll a greater length of the
tion of the unwound slats whereby the weight of
serially connected me __bers_ and operating means
the suspended portion of the blind is substantially
connected to said shaft for rotating same, said ca
- counterbalanced by said counterweight.
ble being shiftable from the first to the second
3. A counterweight device for a roller slat blind
groove for relieving the drum of the weight of the
mounted on a drum supported by a shaft compris
slats.
ing a spiral pulley mounted on said shaft, a coun
6. In a counterweight device for use in con
terweight depending from a cable windable on 65 trolling a winding drum mounted on a shaft and
said spiral pulley, the weight of said depending
adapted to receive a plurality of serially connected
counterweight acting over the different radii of
members, a pulley mounted on said shaft, said
said pulley being in equilibrium with the unwound
pulley having a pair of spiral grooves therein, one
portion of the slat blind in the different winding
of said grooves increasing from a minimum up to
positions thereof on said drum, and a control
a maximum radius, the second of said grooves de
70
mechanism for said dru-m comprising a box, bear
creasing from the same maximum down to a mini
ing members therein, one of said bearings being
mum, a cable attached at one end to the spiral
in the form of a cup-shaped member and provided
pulley and a counterweight attached to the cable, '
with holes, a second shaft in said bearing one end
a guide roll mounted in parallel relationship to
of said second shaft extending beyond the exte
said shaft, a sheave slidable on said guide roll,
rior face of the cup and terminating in a rosette,
2,413,471,
said cable extending over the sheave, the con
volutions of one of the spiral grooves on said
pulley being adapted to increase the radius arm
and hence the torque on the shaft as the winding
drum is rotated to unroll a greater length of the
serially connected members, and operating means
connected to the shaft for rotating same, said
8
shaft, driving connections between the shafts, a.
frame member mounting said second shaft, a cir
cular row of holes in said frame member concen
trically disposed with respect to the second shaft,
a rosette of substantially circular shape in said
second shaft, a spring urged stop pin mounted in
said rosette and adapted to rest in said holes, a
cable being shiftable from the ?rst to the second
handle of length approximately equal to the di
groove for relieving the drum of the-weight of
ameter of the rosette, said handle being pivoted
the slats.
10 to the rosette adjacent the periphery of the
7. In a control device for a slat-type blind
latter and foldable to overlie the stop pin.
adapted to be coiled around and un-coiled from
a shaft, a second shaft perpendicular to said
-
LUIS SORREN'I‘INO.
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