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Патент USA US3100018

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A1181 6, 1963
E. E. RANDMARK
3,100,013
VENETIAN BLIND MECHANISM
Filed. April 4, 1961
CF,
3|
44
INVEN TOR.
ERIC E. RANDMARK
ייwa ?P
ATTORNEYS
United States Patent 0 ?
3,100,013
Patented Aug. 6, 1963
1
2
3,100,013
Head bar 12 contains the control mechanism for the
blind. The tilting mechanism comprises a ?exible tape
or band 22 which can be reciprocated parallel to the axis
VENETIAN BLIND MECHANISM
Eric E. Randmark, Stockholm, Sweden, assignor to
Victor J. Randmark, Rossford, Ohio
Filed Apr. 4, 1961, Ser. No. 100,575
7 Claims. (Cl. 160-168)
of the head bar by the application of tension to the tilt
ing cords 23 and 24 connected thereto. Side elements 16
and 17 are connected to the tilting tape 22 by any suitable
means such as the tabs 25 so that reciprocation of the
tape 22 effects vertical displacement of those elements
by drawing one set of the elements partially into the
head bar while extending the other set of elements from
the bar.
In onder to lower the foremost edge of the slats 1'1 and
tilting ?and displacing mechanism.
raise the rearmost edge, the side elements 16 should be
A primary object of the invention is to improve slat
lowered and the side elements 17 raised. This is done
type blinds.
Another object is to reduce the expense of construction, 15 by moving the turning cord 23 downward to draw the
front portion 26 of tape 22 to the left and the rear por
installation and maintenance of slat type blinds.
tion v261 to the right so that the cords 16 pass through the
A third object is to increase the ?exibility of applica
antiefriction bushings or guide members 27 in the bottom
tion of slat type blinds.
13 of the head bar 12 while the cords 17 are drawn
A ?further object is to enhance the operation of slat
type blinds particularly [by avoiding malfunctions and 20 through the anti-friction bushings or guide members ?281
in bottom 13 upward and into the head bar.
misadjustments due to improper operation.
It will be noted that with the above arrangement twist
A primary feature of this invent-ion resides in the
ing of the ?exible band 22 is avoided by the arcuate slot
utilization of a ?exible band which can be reciprocated
29 in the end block 31 secured within the trough as by
along its length and has a portion turned back upon it
means of the screw 32. The band 22 can advantageously
self so that reciprocation raises the side elements of the
This invention relates to blinds of the type comprising
a plurality of spaced substantially parallel slats which can
be tilted and can be displaced to alter their spacing and
particularly to a novel combination of elements for such
slat support on one ?face of the blind structure and lowers
be composed of metal such as steel so that it can be slid
the side elements on the other ?face thereby altering the
angle of inclination of the slats and the area exposed
through the blinds. Another feature resides in the in
corporation of mechanical limits on the degree of travel
for the reciprocating band to avoid misadjustrnent or
26 and 261 which extend ?along the ?head bar and are es
dam-age to the slat supports during the tilting of the
slats.
A further ?feature involves utilization of ?exible
tubes as guides for the control cords of a blind to enable
the point at which controlling tension is imposed on the
cords to be displaced from the head bar of the blind as
where the blind is spaced between an inner and outer
window and the cord guides extend past the inner win
dow to the interior of the structure. An additional fea
ture involves the mount-ing of cord guides on a swiveled
support ?adapted to be turned whereby access is afforded
to ?the cords from either the face of the blind or the end
of the blind.
The above and additional features of this invention
in the slot 29 while its major faces are held vertical and
the ends issuing therefrom form ?rst and second portions
sentially parallel to the longitudinal axis of the bar. This
slot closely ?ts the turning band 22 and carries it around
a vertical cylindrical surface providing a gentle curve of
su?icient radius to avoid stressing the material of the band
beyond its elastic limit whereby the desired displacement
of the band can be readily attained by applying tension to
one side or the other and the band is positively guided
by a means which is inexpensive in ?rst cost and involves
no moving parts requiring maintenance.
In the construction discussed, excessive longitudinal
motion of the band 22 can result in the lifting of the slats
in a manner in which the mechanism is not intended to
function and can draw the uppermost slat against the
underface of the head bar. This undesirable result is
avoided by the use of the limits or stops 33 in the form
will be more fully appreciated ?from the following de 45 of tabs projecting outwardly ?from the walls 14 and 15 of
the channel forming head bar 12. Stops 33 are arranged
tailed description when read with reference to the accom
to be engaged by the shoulders 30 formed at the band ends
panying drawings in which:
when the band has been displaced su?iciently to effect the
FIG. I is a perspective view of a portion of a blind,
maximum tilting of the slats. These tabs also function as
elements thereof being broken away to reveal details;
50 guides for the turning cords 23 and 24 whereby the need
and
for rotatably mounted guide pulleys to con?ne the range
FIG. II is a plan view of the ?guide adjusting means
showing its application in one installation for which the
of movement of the cords is avoided.
Forces can be
imposed on the end portions 26 and 251 of the tapes to
which the side elements 16 and 17 of the slat supports are
As illustrated in FIG. I the blind consists of a plu?
rality of slats 11, only two of which are shown. It is 55 connected which tend to twist the tape. The con?ning slot
29 opposes these twisting forces at one end of each tape
suspended from a head bar 12 formed as a trough having
portion and the tensioning means by which the tapes are
a bottom 13 and upturned sides or ?anges 14 and 15.
reciprocated tend to overcome twisting forces at the other
Support for the blind slats is afforded by a ?exible ladder
end. Two lengths of cord connected at spaced positions
like structure which may be of cord or tape. In the eX
across the width of the tape and con?ned to vertically
ample the slat support structure is composed of side ele
spaced
cord guides retain the tape in its vertical orienta
ments 16 and 17 extending vertically along the front and
tion across its width.
rear faces respectively of the slats and connected by a
Cord 23 is led into the head bar through a ?exible
plurality of vertically spaced cross supports 18 upon
tubular member which maybe made up of a closely coiled
which the slats 11 rest. The slats are tilted by adjustment 65 metallic spring 34 mounted on a ?ange 35 secured to the
of two ?or more of these support structures by altering the
channel 12. Cord 23 is guided through the open center
vertical displacement of the side elements 16 and 17.
portion of the ?exible tube 34», through an aperture in the
blind is particularly adapted.
The slats are raised and lowered in a ?generally conven
tional manner by means of lifting cords 19 which pass
?ange 35 registering with the bore of tube 34, and thence
around the guide pin 36 mounted on the bottom 13? of the
through apertures 21 which vare aligned in the several slats 70 channel. Within the head bar the cord 23 passes the guide
such that the cords can be drawn upward to raise the lower
pin 36, is led through an aperture 37 in the stop 33 and to
most slat and successively pick up the slats above.
a pulley 38 journalled on one end 26 of the band 22.
3,100,013
3
Similarly, the tilting cord 24 is trained through a tubular
cord guide 34 and an aperture in ?ange 35, past a pin
guide 39 and thence through an aperture 37 in stop plate
33 to a pulley 41 journalled on the opposite end 261 of
4
Without adverse effects as. by displacing the aperture 48 in
frame 47 through which tube 34 passes from a position
registering with the aperture,_49 in ?ange 35 in which tube
34 is secured.
?
the tilting tape 22. A mechanical advantage is gained for 5
While the terms ?baud" and ?tape? have been em
the tilting cords by using a double purchase through the
ployed as synonyms in this speci?cation and the appended
return of the cords from the pulleys 38 and 41 to some
?xed point such as the ?base of the pins 36 and 39 at which
? point the cords are secured. It will be noted that the
rdouble length of cord ?xed in position by means of the
guiding apertures of the limit tabs 33 con?nes the dis
placement of the free ends of the turning band 22 whereby
any twisting effect of the forces imposed on the band
through the slat support side elements 16 and .17 is
claims for the element 22, it is to be appreciated that the
physical characteristics of that element are such that it
is ?exible in the dimension normal to its major surface
and relatively rigid in its dimensions lying in the major
sun?ace. Spring steel is one example of a material offer
ing these characteristics and thereby precluding any twist
ing of the tape 101? band 22 ?which might foul the cords for
tilting the blind. However, other materials such as. bands
opposed.
15 of other metals or plastic might also be employed and
Lifting cords 19 are similarly made accessible for con
the ?band 22 might even the composite, for example, com
trol by training them from the bottom of the blind slats
prising spring steel in the region carried around the ar
through registering apertures 21 in the several super
ouate slot 29 in end block 31 and less expensive metal
imposed slats into the channel forming head bar 12
or plastic in the lengths which parallel the head bar side
?through anti-friction bushings 42, thence to the pin 43
walls 14 and 15. The rigidity of the band 22 can be sup
u?xed on the bottom of the head bar, past that pin and
plemented where necessitated by the forces transmitted
through a suitable aperture in the ?ange 35 to the ?exible
through cords 16 and 17 by providing guides 51 generally
tubular guide 44 secured to that ?ange from which they
aligned with the grommet-s 28 and con?ning the tape to a
project.
longitudinal sliding motion against the head bar side walls
The orientation of the elements shown in FIG. I is ar
14 and 115.
ranged so that the turning and lifting cords for the blind
While this disclosure has not included any means (for
are available from the end of the blind. Where the blind
is applied in installations in which it is more convenient
to feed the control cords from the blind face, this can be
locking ?the lifting cord-s .119 at intermediate positions
whereby the blind can be partially raised, it is to be ap
preciated that such locking means. can be incorporated in
achieved in the present construction by displacing the 30 the structure, such means being ?well known and therefore
?ange extension 35 90?. For this purpose this ?ange con
not requiring illustration here.
. struction is provided with a base having a major face 45
The above described ?features of the invention can be
parallel to the bottom 13 of channel 12 and seated there
used
either singly or in combination. Therefore, it is to
against. The ?ange 35 is integral with and turned up
be appreciated that many substitutions of elements and
ward from this major face 45. As best seen in FIG. II 35 modi?cations of the above disclosed structure can be made
. face 45 is cut away to provide a clearance for the guide
without departing from the spirit and scope of this inven
pins 36 and 39 and is generally triangular in form ter?
tion. Accordingly, this disclosure is to be read asfi?llus
minating in the vicinity of the point about which the
trative of the invention and not in a limiting sense.
plate and ?ange 35 are pivoted. This pivot point can ad
I claim:
vantageously be integral With the guide pin 43 and is
1. A blind comprising a plurality of substantially hori
vcentrally located on ?the width of the head ?bar. Thus,
zontal slats, a substantially horizontal head bar, a pair of
when it is desired to issue the control cords ?from the end
slat supports suspended below said head bar, a ??rst and
of. the blind construction, the plate 35 is rotated about pin
a
second ?exible side element for each support extend
43 to position the plate 35 perpendicular to the face of
the blind and the cord guides or tubes 34 and 44 parallel 45 ing generally vertically along opposite faces of said blind,
a plurality of ?vertically spaced cross supports for each
to the blind face.
.
slat support extending [between said side elements to sup
:The paths ?along which the control cords are guided
port said slats, a ?exible tape having a substantially
when they issue from either the end or face of the blind
greater width than thickness, a body secured to said head
are established by the relative positions of the guide tubes
adjacent one end thereol= having a slot which is semi
.34 and 44, the guide pins 36, 3'9 and 43, and the guide 50 bar
circular
about .a vertical ?axis and of a vertical depth to
apertures in limit tabs 33. Pin 43 is located on the
accommodate the width of said tape, said tape being
diagonal of the square face at the end'of ?bottom 13 and
trained through said slot and having ?rst and second end
is aligned with tthe center of the sides of that square so
, portions on opposite sides of said slot which extend along
that cord 19 is guided (along the center of the head bar for
sazidhead bar and are essentially parallel to its longi
:both orientations of ?ange section 35. Pins 36 and 39 are 55
tudinal axis, a connection between each of said ?rst side
also effective for either orientation of ?ange section 35
elements and said ?rst end portion of the tape and be
since they also are located generally on the diagonal and
tween each of said second side elements and said second
? are aligned along the length of the head bar with the aper
end portion ?of the tape, a guide :for each side element
tures in tabs 33. The tube guides. in ?ange section 35 are
intermediate said connection and said cross supports and
similarly aligned along the head bar when the ?ange is
perpendicular to the face of the blind so that tube 44 es
sentially is centered while tubes 34 are aligned generally
with the pins 36 and 39 along the tube length. With the
?ange section 3-5 parallel to the length of the head bar, the
- alignment between the tubes and pins is maintained and
each cord is carried ?through a 90? turn around its guide
Que utilization of the present blind construction which
. is particularly effective is between double windows repre
sented by the wood frames 46 and 47 of FIG. II. In such
applications the guide tubes 34 and 44 are extended
.lthnough apertures in the frame 47 thereby avoiding abra
sive. action on the cords 19, 23» and 24 as they pass
through the frame. Further, a guide tube can be bent
secured to said head bar, a cord connected to each of said
end portions of said tape, a stop ?or engagement with each
end portion of said tape to limit its longitudinal move
ment, a cord guide on each of said stops, a member piv
oted on said head bar around a substantially vertical
pivot ladjacenrt rthe end of said bar spaced from said body,
a ventical ?ange on said member adjacent an edge of said
head bar, and a plurality of cord guides on said ?ange,
said cords extending from said guides on said stops to said
guides on said flange.
2. A blind comprising a plurality of substantially hori
zontal slats, a substantially horizontal head bar having a
?rst and a second end, a pair of slat supports suspended
below said head bar, a ?rst and a second ?exible side
element for each support extending generally vertically
substantially to carry its cord through a circuitous path 75 ?along opposite faces of said blind, a plurality of vertically
3,100,013
5
spaced cross supports for each slat support extending
between said side elements to support said slats, a ?ex
ible tape having a substantially greater width than thick
ness, a body secured to said head bar adjacent said ?rst
end thereof having a right-circular cylindrical surface
over the semicircular region facing said ?rst end and
extending about a vertical axis, said surface having a
vertical dimension of substantially the width of said tape,
said tape being trained over said surface and contacting
said surface over a substantial portion of its width to 10
maintain its plane generally normal to said head bar, said
tape having ?rst and second end portions on opposite
sides of said surface which extend along said head bar
6
displaced with respect to said guides to alter the inclina
tion of said slats.
4. A blind according to claim 3 wherein said ?rst and
second side elements are connected to the major faces of
said ?rst and sec-0nd portions most remote from said side
walls of said head bar, and said guide means for said
tape are proximate to said connections of said side ele
ments to said portions and are arranged to permit re
ciprocation of said portions and connections.
5. In a Venetian blind, a plurality of spaced substan
tially horizontal slats, a substantially horizontal head bar,
carrying members suspended below said head bar each
comprising two side elements and a plurality of vertically
spaced cross supports extending between said side ele
and are essentially parallel to its longitudinal axis, a con
nection between each of said ?rst side elements and said 15 ments to support said slats, a body portion on said head
bar having a semicircular slot the axis of which is ver
?rst end portion of the tape and between each of said
tical, a ?exible tape trained around said slot and extend
second side elements and said second end portion of the
ing longitudinally of said head bar with its ends parallel
tape, means spaced along said head bar from said surface
and adjacent to each other, ?exible means extending from
engaging the face of said tape at points spaced across
said tape width, said means being coupled to said head 20 each of said side elements ?upward through said head bar
and connected to said ?exible tape, a moveable member
?bar to maintain said spaced points in a plane generally
pivoted on said head bar adjacent an end of said bar
normal to said ?head bar whereby said tape is maintained
and adapted for rotation about a vertical axis, a vertical
generally normal to said head bar in a region spaced
?ange on said moveable member, a plurality of ?exible
from said surface, a guide for each side element inter
mediate said connection and said cross supports and se 25 tubes secured to said ?ange and projecting outwardly
of said head bar, and a cord connected to each end of
cured to said head bar, and means to apply tension to the
said tape for displacing said tape along said head bar
ends of said tape to displace it longitudinally.
and thereby displacing said side elements Vertically to
3. A blind comp-rising a plurality of slats, a substantial
tilt said slats, said cords being trained through said tubes.
ly horizontal head bar of channel form, opposed, general
6. A blind comprising a plurality of slats, a substan
ly vertical side walls on said head bar extending longi 30
tially horizontal head bar, means to tilt said slats, means
tudinally, a pair of slat supports suspended below said
to adjust the separation of said slats, a member pivoted
head bar, a ?rst and a second ?exible side element for
each support extending along opposite faces of said slats,
on said head bar around a substantially vertical pivot, a
vertical ?ange on said member adjacent an edge of said
a plurality of vertically spaced cross supports for each
slat support extending between said side elements to sup 35 head bar, a plurality of cords for operating said slat tilt
ing and adjusting means, couplings between said cords
port said slats, a ?exible tape within said channel form
and said tilting and adjusting means, and guides for said
head bar having a substantially greater width than thick
cords secured to said ?ange whereby the position of said
ness, a body secured to said head bar between said side
?ange about said pivot determines the location of said
walls having a vertical cylindrical surface having a ver
tical dimension of at least a substantial portion of the 40 cords external of said blind structure.
7. In a Venetian blind including a plurality of spaced
width of said tape, said tape having ?rst and second por
substantially parallel slats, means to reduce the spacing
tions which are adjacent and are substantially parallel and
between said slats, means to tilt said slats, to alter the
a portion intermediate said ?rst and second portions
angularity of said slats, a horizontal head bar, :a sec?
trained around said cylindrical surface and bearing upon
tion pivoted on said head bar for rotation about an axis
said surface over a substantial portion of the tape width
normal to said bar, a substantially perpendicular ?ange
to maintain the major tape surface generally normal to
on said section, a plurality of cords for actuating said
said head bar, connections between the ?rst side ele
means, couplings between said cords and said tilting ?and
ments of said supports and said ?rst portion of said tape
adjusting means, and a ?exible tubular guide extending
and between the second side elements of said supports
and said second portion of said tape, tape guide means 50 outwardly of said head bar from said ?ange whereby said
cords trained through said guide are ?available from the
engaging each of said end portions of said tape at points
end of said blind when said ?ange is transverse of the
spaced across the width thereof in a location spaced along
blind face and from the face of said blind when the ?ange
said head bar from said cylindrical surface, each of said
is parallel with the blind face.
guide means being coupled to said head bar and being
spaced from one of said side walls a distance less than 55
the width of said tape, said tape portions each being
disposed between a side wall and a guide means to main
tain their width dimensions ?generally vertical, ?a guide for
each side element located between said cross supports
and said connection to said tape ?and ?xed with respect to 60
said head bar, and means to reciprocate said tape along
its length whereby said ?rst and second side elements are
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,611,845
Allen _______________ __ Dec. 21, 1926
2,572,291
Weaver ______________ __ Oct. 23, 1951
2,639,766
Pratt _______________ __ May .26, 1953
2,759,535
Berglind .._,__,____,_,_______ Aug. 21, 1,956
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