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Патент USA US2110710

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March 8, 1938;
H, K_ LORENTZEN
2,110,710
VENETIAN BLIND TILTER
Original Filed April 4, 1935
.
INVENTOR
' Ham?”. Lmwztzem
2,110,710
Patented Mar. 8, 1938
' UNITED, STATES PATENT ‘OFFICE
2,110,710
‘
VENETIAN BLIND TILTER.
Hans‘K. Lorentzen, Montclair, N. J.
Original application April 4, 1935, Serial No.
14,557. Divided and this application October
15, 1936, Serial No. 105,688
8 Claims.
This invention relates to hardware to be in
corporated in Venetian blinds, and more par
ticularly to a mechanism for changing the in
clination of the slats of the blind. Originally
5 the subject-matter was presented in myprior
application, Serial No. 14,557, ?led April ‘1, 1935
(Patent No. 2,075,214, March 30, 1937), of which
application this is a division.
An object of the invention is to-provide tilt
10 ing mechanism which can be economically and
satisfactorily fabricated, largely from stamped
sheet metal, on a quantity production basis.
Another object of the invention is to provide
a Venetian blind tilter which will be attractive
15 in appearance and rugged and reliable in service.
Various speci?c objects of the invention will
,
,
(Cl. 156-47)
left hand end of the bar I, but if 'it is to be placed
at the right hand end of the bar, the construction
of the mechanism is the same except that it is
made of the opposite hand.
The tilter includes an angle bracket 2 which GI
depends from the suspension bar I and to which
is pivoted a U-shaped rocking member 3 that
is adapted to have connected to it the top or tilt
slat 4 of the blind. Integral with the U-shaped
rocking member 3 is a gear sector portion 6 that 10
is operated by a worm ‘I, driven from a pulley
8 and a cord 9. While any suitable form of worm
may be used, the worm shown is stamped from
a disc of sheet metal. After the worm has been
formed, it is riveted to one end of a shaft I0 15
disclosure herein of an illustrative preferred em
‘and the shaft is slipped into a brass bushing II.
The pulleyil may be of any suitable form but
as shown it is composed of two coned sheet metal
bodiment of the invention.
' discs 83 and 81’.
be apparent to those skilled in the art from the
,
Fig. I is a vertical section through the suspen
20
sion bar of a Venetian blind, showing in side ele
vation tilting mechanism of the present inven
tion attached to the suspension bar.
Fig. II is a fragmentary rear elevation showing
25 the tilter attached to the suspension bar and the
top slat of the blind attached to the tilter.
Fig. III is a fragmentary horizontal view taken
in general on the line III-III of Fig. I, with a
fragment of the top slat of the blind added to
30 the structure shown in Fig. I.
‘
Fig. IV is a fragmentary vertical section taken
in general on the line IV-—'IV of Fig. I, with a
fragment of the top slat of the blind added to
the structure shown in Fig. I.
Fig. V is a horizontal detail view, partially in
35
section, showing the gear sector and worm illus
trated in Fig. I.
_
Fig. VI is an isometric view showing an end
of the top slat of the blind, with a modi?ed form
After the shaft I0 has been
placed in the bushing II, the pulley 8 is suitably
secured to the free end of the shaft, as by rivet
mg.
The depending leg of the bracket 2 is formed
with an opening 2*‘, for accommodation of the
worm 'l', and with a horizontal partly cylindrical
portion l3. f The bushing II, with the gear and
pulley attached thereto as previously described,
is assembled with the angle bracket 2, the gear ,
1 extending in the-opening 2a and the bushing
ll lying in depression l3. The bushing may be
fastened in this position by means of a metal
strap l4 which ?ts into a circumferential groove
He formed in the bushing l I, the ends of the
strap being passed through slots in the bracket
2 and having their ends bent outwardly against .
the face of the bracket as shown in Fig. IV.
The U-shaped rocking member 3 is pivoted
to the lower end of bracket 2 by means of a
ventional construction and hence the blind it
brass bearing pin H which is riveted to bracket
2 and which engages only the inner leg of the
U-shaped rocking member. The outer leg of
the U-shaped rocking member is appropriately
formed to receive a coupling member carried. by
self is not disclosed herein. The blind may be
the top or tilt slat of the Venetian blind; and as
40 of attaching member.
The tilter, or tilting mechanism, is intended to
be used with a Venetian blind of well known con
45 supported from/the top of a window frame, but
ordinarily it is supported from a suspension bar
I which is fastened adjacent to the top of the
window and carries pulleys and cords (not shown)
for raising and lowering the blind. At present,
50 it is the usual practice to place the tilter of Fig.
I at the left hand end of the suspension bar
(the bar being viewed from within the room)
but occasionally, the tilter is placed at the-right
hand end of the bar. In the disclosure herein, it
55 will be assumed that the tilter is placed at the
shown, this rocking member is formed to receive
either of two forms of couplings. ‘In Figs. II, III,
and IV, the top or tilt slat 4 of the blind is pro
vided with a pair of coupling pins I8, I 8 which
are adapted to be inserted in holes 3“, 3“ in the
rocking member. As shown in Fig. VI, the top
or tilt slat 4 of the blind is provided with a
stamped metal ?tting l9 having a ?at tongue
end l9"L which may be'inserted into the slot 3'"
of-the U-shaped rocking member.
The side of. the U-shaped rocking member 55
2
2,110,710
which lies against the bracket 2 has its upper
edge formedsemi-circularly and cut to form gear
teeth 6“. In order to widen the gear teeth, for
one end of the shaft and extending into the
opening, the other end of the shaft carrying an
purposes that will be explained hereinafter, a
semi-circular plate 6' is formed with teeth simi
having one side of the U formed with a curved
upper edge out with gear teeth, the rocking
member being pivoted to the bracket with the
gear teeth cooperating with the worm wheel.
lar to the teeth 5“; and plate 6' is positioned
against the portion 6 of the rocking member with
the teeth on the two members slightly in echelon
as shown in Fig. V. The parts 6 and 6' are per
10 manently secured together in this relationship,
preferably by spot welding.
By the use of plate 6’, the thickness of the
gear teeth is doubled, while permitting the parts
to be made from a weight of sheet metal that is
easy to cut and stamp. When a stamped sheet.
metal worm is used there is only a slight cir
cumferential overlap of the two ends of the
worm thread, and it is helpful to have double
thick teeth on the rocking member 3 in order
20 to insure engagement of the worm with one
tooth before the worm has disengaged from the
preceding tooth. The formation of the gear teeth
by two plates also permits the stepped arrange
ment illustrated in Fig. V, which enables the
25 gear sector to cooperate more favorably with the
slanting pitch of the worm. It is well known
that in the usual stamping operations the un
der side of the cut is left with a sharp edge.
By so stamping the parts 6 and 6' that the sharp
30 edges are on the meeting surfaces of the two
parts when assembled, the outer corners of the
teeth -on both faces of the complete rocking
member 3 are relatively smooth for cooperation
with the worm.
35
With an adequate circumferential overlap of
the two ends of the thread of the worm, it is
feasible to omit the plate 6' and use only the
single thickness gear formed on portion 6 of
the U-shaped rocking member 3. However, the
40 double thickness gear form has been disclosed, as
it is the best form known to me for use with a
stamped sheet metal worm.
In operation, motion imparted to cord 9 causes
the concurrent rotation of pulley 8, shaft l0,
45 and worm ‘I. As the worm 1 rotates, it imparts
rotarymovement to the rocking member 3 with
the result that the top slat 4 of the blind is tilted.
As is well understood in the art, the top slat is
articulated with the other slats of the blind by
means of a ladder tape or the like (not shown)
so that all slats in the blind are tilted simul
taneously upon the tilting of the top or tilt
slat 4.
In compliance with the patent statutes I have
55 disclosed the best form in which I have con
templated applying my invention, but it is to be
understood that the disclosure herein is to be
considered as illustrative and not limiting the
scope of the invention.
60
I claim:
1. A,Venetian blind ?tting comprising a brack
et, a worm wheel mounted on the bracket, a U
shaped rocking member formed of sheet metal,
one leg of the U-member having a curved edge
formed with gear teeth and pivoted to the brack
et, a plate welded to the toothed leg of the rock
ing member and formed with teeth correspond
ing to the teeth of the rocking member.
2. A Venetian blind ?tting comprising an an
70 gle bracket having a vertical branch and a hori
zontal branch, the vertical branch being formed
with a partly cylindrical horizontal depression
and with an opening extending across the de
pression, a bushing secured in the depression, a
shaft
in the bushing, a worm wheel secured to
.75
operating device, a U-shaped rocking member
3. A tilter for Venetian blinds comprising a
sheet metal angle bracket having a horizontal leg
to be attached to a support for suspending the
bracket and a vertical leg depending from the
horizontal leg, the vertical leg being formed with
an opening and a horizontal groove extending
on opposite sides ‘of the opening, a shaft and
worm assembly positioned adjacent to said groove 15
with the worm in said opening, a shaft-securing
member of sheet metal, lying adjacent to said
shaft and affixed to said vertical leg, a gear
pivoted to said vertical leg and meshing with
said worm, and means integral with said gear 20
to engage the tilt slat of a Venetian blind.
4. A tilter for Venetian blinds comprising a
sheet metal angle bracket having a horizontal leg
to be attached to a support for suspending the
bracket and a vertical leg depending from the
horizontal leg, the vertical leg being formed with
an opening and a horizontal groove extending on
opposite sides of the opening, a shaft and worm
assembly positioned adjacent to said groove with
the worm in said opening, a shaft-securing mem
30
ber of sheet metal, lying adjacent to said shaft
and affixed to said vertical leg, and a U-shaped
member pivotally attached to said vertical leg of
the bracket, one side of such U-shaped member
being formed with gear teeth meshing with said 35
worm and the other side being formed for en
gagement with the tilt slat of a Venetian blind.
5. A tilter for Venetian blinds comprising a
sheet metal bracket having a groove pressed
therein, a shaft, a worm on one end of the shaft, 40
9. driving member on the other end of the shaft,
a bushing on the shaft between the worm and
the driving member, said bushing being posi
tioned in said groove in the bracket, and the
bushing having an exterior circumferential 45
groove, and a metal strap lying in said circum
ferential groove, said strap being secured to said
bracket to hold the bushing in assembled rela
tion with the bracket.
6. A tilter for Venetian blinds comprising a 50
sheet metal bracket having a groove pressed
therein, a shaft, a worm on one end of the shaft,
a driving member on the other end of the shaft,
a bushing on the shaft between the worm and the
driving member, said bushing being positioned in ,
said groove in the bracket, and the bushing hav
ing an exterior circumferential groove, and a
metal strap lying in said circumferential groove,
the ends of the strap being passed through slots
in said bracket and being clinched against the
opposite side of the bracket to hold the bushing
in assembled relation with respect to the
bracket.
'7. A tilter for Venetian blinds comprising a
sheet metal bracket, a worm mounted. on said 65
bracket, a U-shaped sheet metal rocker having
one leg thereof positioned adjacent to said brack
et ‘and formed with teeth meshing with said
worm, a sheet metal member positioned against
said leg of the U-shaped rocker, and a pivot 70
pin passing through said sheet metal member,
said leg of the U-shaped rocker, and said bracket.
8. A tilter for Venetian blinds comprising a
sheet metal angle bracket having a horizontal
leg for attachment to a support, and having a 76
2,110,710
depending vertical leg, the vertical leg having a
horizontal groove pressed therein, a bushing posi
tioned in said groove, said bushing having an ex
ternal circumferential groove, a metal strap en
gaging the grooved portion of the bushing, the
ends of the strap being passed through holes in
said vertical leg of the bracket and being clinched
on the opposite side thereof to secure the bushing
'
3
in assembled position, a shaft journalled in the
bushing, means to rotate the shaft, a worm on
the shaft, and a sheet metal rocker member
pivoted to the depending leg of the bracket, the
rocker member having teeth meshing with said
worm.
HANS K. LORENTZEN.
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