Note: Descriptions are shown in the official language in which they were submitted.
CA 02913427 2015-11-26
CURTAIN BODY LOCATING MECHANISM OF A CURTAIN WITH NO CORD
BACKGROUND OF THE INVENTION
[0001] Technical Field
[0002] The present invention relates to a curtain with no cord, and more
particularly, to a curtain body locating mechanism for use in a curtain with
no cord.
[0003] 2. Description of Related Art
[0004] Generally, curtains can be divided structurally into curtains with
cord and
curtains with no cord. For the curtains with cord, a user mainly utilizes a
cord to drive the
curtain body to be spread or folded; and for the curtains with no cord, the
user uses his/her
hand to pull down or push up a lower beam so as to spread or fold the curtain
body.
[0005] However, although curtains with no cord allow users to spread or
fold the
curtain body easily, the curtain body is likely to rise again automatically
after being fully
spread or sag automatically after being fully folded due to the lack of a good
locating
design in structure, and this will make the practical operation troublesome
for the users.
BRIEF SUMMARY OF THE INVENTION
[0006] A primary objective of the present invention is to provide a
curtain body
locating mechanism for use in a curtain with no cord which has a simple
structure and can
provide good locating effect so as to make the operation more convenient.
[0007] To achieve the aforesaid objective, the curtain body locating
mechanism of
the present invention comprises a base, two coil spring wheels, a coil spring,
two cord
wheels, two separation and reunion units and two cords. The coil spring wheels
are
disposed on the base rotatably and engaged with each other. The coil spring is
connected
to the two coil spring wheels and optionally winded onto one of the coil
spring wheels so
that the two coil spring wheels can rotate simultaneously. The two cord wheels
are
1
CA 02913427 2017-01-27
disposed on the base rotatably and engaged with the two coil spring wheels
respectively
so that each of the cord wheels and the coil spring wheel with which the cord
wheel is
engaged can rotate simultaneously. Each of the two separation and reunion
units is
disposed adjacent to one of the cord wheels respectively and comprises an
axle, at least
two braking blocks, a separation and reunion wheel and at least two planetary
gears. The
axle is fixed on the base, and the two braking blocks are spaced apart and
fixed on the
base and are connected to the periphery of the axle so that a rolling groove
is formed
between the two braking blocks. The separation and reunion wheel has an axle
hole and
an inner ring gear adjacent to the axle hole. The axle hole is nested onto the
axle rotatably,
and the two braking blocks are surrounded by the inner ring gear. Each of the
planetary
gears is disposed within one of the rolling grooves rollably and engaged with
the inner
ring gear of the separation and reunion wheel so that each of the planetary
gears can be
driven by the inner ring gear of the separation and reunion wheel to be
clamped to or
separated from one of the braking blocks. Each of the two cords is winded onto
one of the
separation and reunion wheels respectively and an end of each of the two cords
is fixed to
one of the cord wheels so as to drive the separation and reunion wheel to
rotate when the
curtain body is being spread.
[0008] Accordingly, when the planetary gear is clamped to the inner ring
gear of
the separation and reunion wheel, the separation and reunion wheel cannot
rotate, and in
this case, the curtain body cannot be spread or folded so as to be located.
When the
planetary gear leaves the inner ring gear of the separation and reunion wheel,
the
separation and reunion wheel can rotate freely, and in this case, the curtain
body can be
spread.
[0008a] In one embodiment of the present invention there is provided a
curtain
body locating mechanism for use in a curtain with no cord. comprising: a base;
two coil
spring wheels disposed on the base rotatably and engaged with each other: a
coil spring
CA 02913427 2017-01-27
configured to connect the two coil spring wheels; two cord wheels disposed on
the base
rotatably and engaged with the two coil spring wheels respectively; two
separation and
reunion units disposed adjacent to the cord wheels respectively and each
comprising an
axle. at least two braking blocks, a separation and reunion wheel and at least
two
planetary gears, wherein the axle is fixed on the base, the two braking blocks
are spaced
apart and fixed on the base and are connected to the periphery of the axle so
that a rolling
groove is formed between the two braking blocks, the separation and reunion
wheel has
an axle hole and an inner ring gear adjacent to the axle hole. the axle hole
is nested onto
the axle rotatably, the two braking blocks are surrounded by the inner ring
gear, and each
of the planetary gears is disposed within one of the rolling grooves rollably
and engaged
with the inner ring gear of the separation and reunion wheel so that each of
the planetary
gears can be driven by the inner ring gear of the separation and reunion wheel
to be
clamped to or separated from one of the braking blocks: and two cords winded
onto the
separation and reunion wheels respectively and art end of each of the two
cords being
fixed to one of the cord wheels respectively.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0009.1 Fig. 1 is a
perspective view of a curtain according to a first embodiment of
CA 02913427 2016-05-03
the present invention;
[0010] Fig. 2 is an exploded perspective view of the first embodiment of
the
present invention;
[0011] Fig. 3 is a cross-sectional side view of a separation and reunion
unit
according to the first embodiment of the present invention;
[0012] Fig. 4 is a top view of the separation and reunion unit of the
first
embodiment of the present invention and mainly shows that a planetary gear is
clamped to
a braking part of a braking block;
[0013] Fig. 5 is similar to Fig. 4 and mainly shows that the planetary
gear reaches
an adapting part of the braking block;
[0014] Fig. 6 is a front view of the curtain of the present invention and
mainly
shows a curtain body in a spread state;
[0015] Fig. 7 is similar to Fig. 6 and mainly shows the curtain body in a
folded
state; and
[0016] Fig. 8 is a cross-sectional top view of a separation and reunion
unit
according to a second embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0017] Referring to Fig. 1 and Fig. 7 firstly, a curtain body locating
mechanism 12
of the present invention is mainly used in cooperation with a curtain 10 with
no cord, and
the curtain 10 with no cord shown in the figures comprises an upper beam 14, a
lower
beam 16 and a curtain body 18 disposed between the upper beam 14 and the lower
beam
16. Next referring to Fig. 2 and Fig. 3, the curtain body locating mechanism
12 of the
present invention comprises a base 20, two coil spring wheels 30, a coil
spring 40, two
cord wheels 50, two separation and reunion units 60 and two cords 70.
3
CA 02913427 2016-05-03
[0018] The base 20 is installed within the upper beam 14 and comprises a
top plate
22 and a bottom plate 24.
[0019] The coil spring wheels 30 are disposed on the base 20 rotatably and
engaged with each other.
[0020] Two ends of the coil spring 40 are connected to the coil spring
wheels 30
respectively so that the two coil spring wheels 30 can rotate simultaneously
through the
coil spring 40.
[0021] Each of the cord wheels 50 is disposed on the base 20 rotatably and
engaged with one of the coil spring wheels 30 respectively so that the cord
wheel 50 and
the coil spring wheel 30 with which the cord wheel 50 is engaged can rotate
simultaneously.
[0022] Each of the separation and reunion unit 60 is disposed adjacent to
each of
the cord wheels 50 and comprises an axle 61, three braking blocks 62, a
separation and
reunion wheel 63 and three planetary gears 64. The axle 61 is fixed on the
bottom plate 24
of the base 20. The three braking blocks 62 are fixed on the bottom plate 24
of the base 20
and are connected to the outer periphery of the axle 61 at equal angles so
that an rolling
groove 65 is formed between every two adjacent braking blocks 62, wherein each
of the
rolling grooves is arc-shaped. As shown in Fig. 4 and Fig. 5, the curvature of
one end of
the rolling groove 65 is larger than the curvature of the other end of the
rolling groove 65.
Because the braking blocks 62 adjacent to the two ends of each rolling groove
65 are
different braking blocks 62, a braking part 67 and an adapting part 66 are
formed at two
ends of each braking block 62 respectively based on the curvature difference
between the
two ends of the rolling groove 65, and the curvature of the braking part 67 is
larger than
the curvature of the adapting part 66. The separation and reunion wheel 63 has
an axle
hole 68 and an inner ring gear 69 adjacent to the axle hole 68, and the
separation and
4
CA 02913427 2016-05-03
reunion wheel 63 is nested onto the axle 61 through the axle hole 68. After
the separation
and reunion wheel 63 is nested onto the axle 61, the braking blocks 62 are
surrounded by
the inner ring gear 69. The planetary gear 64 is disposed within the rolling
groove 65 and
engaged with the inner ring gear 69 of the separation and reunion wheel 63 so
that the
planetary gear 64 can be driven by the inner ring gear 69 of the separation
and reunion
wheel 63 to roll along the rolling groove 65 when the separation and reunion
wheel 63 is
rotating.
[0023] The separation and reunion wheel 63 is winded around by the cord 70
and
two ends of the cord 70 are fixed to the lower beam 16 and the cord wheel 50
respectively
so that the cord 70 can drive the separation and reunion wheel 63 and the cord
wheel 50 to
rotate simultaneously when the lower beam 16 is pulled down.
[0024] When a user needs to spread the curtain body 18, as shown in Fig.
6, he/she
firstly applies a force to pull down the lower beam 16 so that the cord 70 is
stretched by
the lower beam 16. When the cord 70 is stretched by the lower beam 16, the
separation
and reunion wheel 63 and the cord wheel 50 will be driven firstly to rotate.
When the
separation and reunion wheel 63 is rotating, as shown in Fig. 5, the
separation and reunion
wheel 63 utilizes the inner ring gear 69 thereof to drive the planetary gear
64 to roll along
the rolling groove 65 to the adapting part 66 of the braking block 62. At this
point, the
planetary gear 64 idles so that the separation and reunion wheel 63 can be
pulled by the
cord 70 to rotate freely. On the other hand, the rotation of the cord wheel 50
will drive the
coil spring wheel 30, with which the cord wheel 50 is engaged, to rotate so
that the coil
spring 40 is unwound from one coil spring wheel 30 and winded onto the other
coil spring
wheel 30 to accumulate its elastic restoring force.
[0025] Once the curtain body 18 has been spread to an appropriate
position, the
pulling force applied to the lower beam 16 is released. At this point, under
the effect of the
CA 02913427 2016-05-03
elastic restoring force of the coil spring 40, the coil spring wheel 30 will
drive the cord
wheel 50 to rotate slightly in the opposite direction. When the cord wheel 50
is rotating in
the opposite direction, a small part of the cord 70 is winded onto the cord
wheel 50 so that
the separation and reunion wheel 63 can be pulled by the cord 70 to rotate
slightly in the
opposite direction. When the separation and reunion wheel 63 is rotating in
the opposite
direction, the separation and reunion wheel 63 utilizes the inner ring gear 69
thereof to
drive the planetary gear 64 to roll along the rolling groove 65 to the braking
part 67 of the
braking block 62 so as to be clamped to the separation and reunion wheel 63,
as shown in
Fig. 4. As such, the planetary gear 64 will stop rotating, which will in turn
make the
separation and reunion wheel 63 stop rotating. In this case, the elastic
restoring force of
the coil spring 40 is offset by the frictional resistance between the cord 70
and the
separation and reunion wheel 63 so that the curtain body 18 can remain spread.
[0026] When the user needs to fold the curtain body 18, as shown in Fig.
7, he/she
firstly applies a force to push the lower beam 16 up so that the cord 70 is
loosed to reduce
the frictional resistance between the cord 70 and the separation and reunion
wheel 63. In
this case, the elastic restoring force of the coil spring 40 forces the two
coil spring wheels
30 to rotate in opposite directions simultaneously with the aid of the pushing
force of the
user, and the rotation of the coil spring wheel 30 will in turn drive the cord
wheel 50 to
rotate so as to wind the cord 70 onto the cord wheel 50. After the curtain
body 18 is
completely folded together, the pushing force applied to the lower beam 16 is
released so
that the cord 70 is winded tightly onto the separation and reunion wheel 63
again. In this
case, the elastic restoring force of the coil spring 40 is offset by the
frictional resistance
between the cord 70 and the separation and reunion wheel 63 so that the
curtain body 18
can remain folded.
[0027] Furthermore, it shall be appreciated that, the present invention
may have
6
CA 02913427 2016-05-03
different varieties in structure. As shown in Fig. 8, the number of the
braking blocks 62 is
not necessarily to be three and it can be reduced to two depending on
practical needs. In
this case, the braking blocks 62 are connected to the outer periphery of the
axle 61
symmetrically so that two rolling grooves 65 are formed between two ends of
two
different braking blocks 62 respectively. Each of the rolling grooves 65 has a
planetary
gear 64 disposed therein. Accordingly, when the separation and reunion wheel
63 is driven
by the cord 70, the planetary gear 64 can also be driven to roll along the
rolling groove 65
so that a separation and reunion effect can also be achieved between the
planetary gear 64
and the braking block 62.
[0028] According
to the above description, the curtain body locating mechanism
12 of the present invention utilizes the separation and reunion units 60 to
provide the
curtain body 18 with a good locating effect. Overall, the curtain body
locating mechanism
12 has a simple structure and is stable in operation so that it can
effectively prevent the
curtain body 18 from rising again after being spread and sagging after being
folded. In this
way, the operation can be done more conveniently.
7
