Information
-
Patent Grant
-
6257305
-
Patent Number
6,257,305
-
Date Filed
Friday, April 14, 200024 years ago
-
Date Issued
Tuesday, July 10, 200123 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 160 310
- 160 231
- 160 133
- 160 26
- 160 31
- 160 315
- 242 3753
-
International Classifications
-
Abstract
The instant invention is an apparatus for maintaining approximately constant tension of a curtain between a drive roller and a storage roller. The constant tension is achieved by pre-tensioning the curtain between the drive roller and the storage roller and then maintaining approximately the same amount of tension by rotating the reference to which one end of a spring is attached. The rotating reference is a shaft which is affixed to and rotates with a shaft gear. The other end of the spring is affixed to a cylindrical tube member, i.e., the storage roller, upon which the flexible curtain is stored. A motor driven gear drives a gear affixed to the drive roller. The gear affixed to the drive roller in turn drives idler gears which in turn drive the shaft gear. A method of using the apparatus is also disclosed.
Description
FIELD OF THE INVENTION
The invention relates to a driving and storing mechanism for flexible curtain material that covers openings in a structure which provide protection for the opening from high wind velocity pressure (i.e., hurricanes and tornadoes) and impacts from windborne debris. Instead of a flexible curtain any type of covering including a garage door or other structure made of slats may be used employing the principles of the instant invention. The mechanism of the invention includes a system where a substantially constant tension is maintained on the curtain material as it is unwrapped from its storage roller to close an opening in a structure and as it is wrapped in returning it to the fully stored condition.
BACKGROUND OF THE INVENTION
It is desired to keep approximately the same amount of tension on the curtain as it is lowered from the completely stored position into the completely dispensed position. Further, it is desired to keep approximately the same amount of tension on the curtain between the storage roller and the driving roller. Constant tension on the curtain between the storage and driving rollers results in the curtain's smooth storage in a small area. Further, and importantly, constant tension between the storage and driving rollers enables use of a smaller and lower powered electric motor. Employing a variable reference point for the spring of the instant invention enables the maintenance of approximately constant tension in the flexible curtain as it traverses between the open and closed positions and between the closed and open positions. By closed it is meant that the curtain covers the opening in the building and by open it is meant that the curtain does not cover the opening in the building. In the closed position the curtain is fully deployed or dispensed from the storage roller and in its open position the curtain is fully stored or wound on the storage roller. Without a variable reference, the driving motor must use more energy as the curtain progresses from the open position toward a closed position. During rewind of the curtain from the closed position to the open position, constant tension between the driving roller enables smooth winding of the flexible curtain of the storage roller.
U.S. Pat. No. 958,605 to Doring discloses a fixed sleeve “c” and a nut “l” having lugs or projections “k.” Nut “l” moves leftwardly and rightwardly as it is driven by threaded shaft “g.” A curtain is affixed to a roller “a” and the roller is affixed to a toothed gear/hub “b.” Gear/hub “b” is rotatable with respect to the fixed sleeve “c.” Gear “b” drives gears “d” and “e” which drive gear “f” in the same direction as gear “b.” Gear “f” is affixed to shaft “g” which is threaded. Rotation of the roller “a” causes the threaded shaft “g” to rotate through nut “l” causing nut “l” to move leftwardly storing energy in the spring as the curtain is pulled downwardly. The spring is fixed at one end, however, and a variable reference is not employed. Energy stored in the spring is released when the curtain is released from a restraint and it is this energy which returns the curtain to its stored position.
U.S. Pat. No. 2,842,198 to Prieto discloses a split ring torsion regulator which limits expansion and, hence, tension in a spring. The split ring is adjustable but a variable reference is not employed.
U.S. Pat. No. 667,302 to Edwards discloses an apparatus by which the tension of the spring in a roller may be changed or adjusted without the removal of the roller from its brackets or mountings. More specifically, a spring is connected to a roller and to a rotatable part or a spring is connected to a barrel and a rotatable spindle. The rotatable part or the rotatable spindle are adjustable as desired. However, the adjustment is permanent and does not provide a variable reference point for the spring in either instance.
U.S. Pat. No. 1,828,623 to G. M. Sacerdote discloses a pulley driven shaft and a spring connected to its shaft and to a roller. When the screen is unwound from the roller the belts will be wound around the pulleys and vice versa. As the screen and belts are thus wound, the diameter of the roller and pulleys vary and the tension upon the screen is such to keep the curtain taut, varying between two limits which are not far apart.
U.S. Pat. No. 3,955,611 to Coles et al. discloses an awning construction particularly adapted for mounting on a mobile home. The awning includes an awning shade having one end fixed to an outside wall of the mobile home, and the other end of the awning shade is attached to an awning roller, which roller is pivotedly connected to the same outside wall. The awning roller includes an elongated torque rod which is nonrotatably connected to a pair of support arms. The support arms are pivotedly connected to the outside wall. A tube is rotatably mounted on the torque rod and is secured to the other end of the awning shade. A torsion spring connects the torque rod with the tube to rotate the tube relative to the torque rod and holds the tube up against the wall of the mobile home in its normal condition. A lock
126
releasably locks the tube relative to the torque rod to allow the tube to stay selectively in an extended position away from the side wall. See, FIG.
6
.
U.S. Pat. No. 4,013,113 to Frei discloses a shutter which includes a curtain formed of elongated bars hinged to one another at longitudinal edges and guided at their ends in laterally spaced guide grooves extending along opposite sides of an opening to be controlled by the shutter. A rotatable member is mounted in an upper receiving zone, such as a lintel above the opening, and the rolling bar curtain is trained about this member for direction reversal during raising and lowering. The laterally spaced guide grooves extend along the peripheral portion of this rotary member and are then branched to form branch guide grooves extending downwardly from the rotatable element into a recess formed in the lintel or the like. Guide elements, such as pins or rollers on the ends of each bar, cooperated with the branch guide means to conjointly guide the bars to form at least one vertical pile of bars superposed in horizontal orientation in the recess, responsive to raising of the curtain. The rotatable element may be circular or may be polygonal and if polygonal, has sides each conforming to the width of a bar of the curtain. This invention is demonstrative of the complexities of guiding and managing a curtain that is somewhat flexible and made from rigid sections.
U.S. Pat. No. 4,478,268 to Palmer discloses a door for closing a vehicular traffic passageway. The door is a curtain fabricated from a hard flexible material. The curtain runs in opposing channels, is mounted on a counterbalanced windup drum and under impact changes weight and moves out of the channels and is wound up to open the vehicular passageway.
U.S. Pat. No. 4,601,320 to Taylor discloses a pressure differential compensating door which includes a curtain for closing a doorway having a first upper end, a second lower end and side edges and a counterbalanced curtain winding mechanism having the first end of the curtain attached thereto for raising and lowering the curtain.
None of the related art, however, solves the problem of maintaining approximately constant tension between the storage roller and the drive roller throughout the travel of the curtain from a fully stored position to a fully deployed position and back. Further, none of the related art solves the problem of maintaining approximately constant tension between the drive roller and the storage roller so as to enable use of a relatively low power motor. Present designs require the use of a large motor so as to overcome the resistance of a spring connected at one end to a storage roller and at the other end to a fixed structure (ground). Present designs require a large motor because the resistance of the spring increases linearly as the curtain extends toward its fully deployed position.
SUMMARY OF THE INVENTION
The instant invention is an apparatus for maintaining approximately constant tension of a curtain between a drive roller and a storage roller. The constant tension is achieved by pre-tensioning the curtain between the drive roller and the storage roller and then maintaining approximately the same amount of tension by rotating the reference to which one end of a spring is attached. The rotating reference is a shaft which is affixed to and rotates with a shaft gear. The other end of the spring is affixed to a cylindrical tube member, i.e., the storage roller, upon which the flexible curtain is stored. A motor driven gear drives a gear affixed to the drive roller. The gear affixed to the drive roller in turn drives idler gears which in turn drive the shaft gear.
It is an object of the present invention to provide an apparatus for maintaining approximately constant tension on a flexible curtain between a storage roller and a drive roller. Cogs or toothed projections on the driving roller engage apertures in the flexible curtain enabling the curtain to be driven between open and closed positions.
It is an object of the present invention to provide an apparatus for storing and driving a flexible curtain which requires a low power motor. A low power motor may be used when the tension between the driving roller and the storage roller is approximately constant between initial (curtain fully stored) and final (curtain fully dispensed) conditions.
It is an object of the present invention to provide a method for opening and closing a flexible curtain under approximately constant tension between a storage roller and a driving roller.
DESCRIPTION OF THE DRAWINGS
FIG. 1
is a front elevational view of the driving and storing mechanism of the present invention illustrating the curtain material covering an opening (shown in phantom) in a building structure;
FIG. 1A
is a vertical cross-section of the mechanism shown in FIG.
1
and specifically illustrated as being along the lines
1
A—
1
A of
FIG. 2
;
FIG. 2
is a fragmentary cross-sectional view taken generally along the lines
2
—
2
of
FIG. 1A
;
FIG. 3
is a rear view of the driving and storing mechanism illustrated in
FIG. 1
;
FIG. 4
is a view similar to
FIG. 1
but omits the openings in the building structure as seen in phantom in
FIG. 1
;
FIG. 4A
is a diagrammatic view taken generally along the lines
4
A—
4
A of
FIG. 4
illustrating the arrangement;
FIG. 4B
is a view taken generally in the same direction as
FIG. 4A
but showing only the tube member (storage roller) which is used to store the flexible curtain material and the curtain engagement member (drive roller) which is used to engage and drive the curtain material in its up and down movements;
FIG. 4C
is an enlarged portion of
FIG. 4A
;
FIG. 4D
is an enlarged partial cross-sectional view taken generally along the lines
4
D—
4
D of FIG.
4
A and showing the cylindrical tube member (storage roller) upon which the flexible curtain material is wrapped in stored condition;
FIG. 4E
illustrates an inverted belt drive
97
operating between a pulley affixed to the drive shaft and a pulley affixed to a shaft within the storage roller;
FIG. 4F
is an enlarged portion of
FIG. 4B
illustrating the interengagement of cogs/pins of the drive roller with apertures in the flexible curtain;
FIG. 5
is an isometric view of a variation in the means for driving the storing mechanism illustrated in the previous figures;
FIG. 6
is an elevational view of the electric motor and its connections and as illustrated in
FIG. 5
; and
FIG. 7
is a fragmentary isometric view from another angle illustrating the parts also shown in FIG.
5
and FIG.
6
.
A better understanding of the drawings will be had when reference is made to the Description of the Invention and the claims which follow hereinbelow.
DESCRIPTION OF THE INVENTION
Referring to
FIG. 4D
, a cylindrical tube member
40
(sometimes referred to as a storage roller
40
) has an outer cylindrical surface
41
for the reception of a length of curtain material
22
in a rolled up configuration. The storage roller
40
is mounted in the frame structure of a window opening. See,
FIG. 1A
as well. This frame structure includes 2×6 inch wooden members
29
and as shown in
FIG. 1A
, siding
31
covering the exterior of the building and plasterboard or other internal wall structure
32
. Vertical bearing members
35
and
36
are provided in the building structure
28
and serve to position and mount the storage roller
40
and other structures to be described hereinafter. One end of the storage roller
40
at
42
is mounted for rotation in the bearing structure
35
and the other end is mounted for rotation in the bearing member
36
. This is accomplished by a first shaft
44
best seen in the enlarged view of
FIG. 4D
which has first
45
and second
46
end portions with the first end portion
45
extending coaxially into the tube member
40
and with the second end portion
46
of the first shaft
44
extending exteriorly of the tube member. This second end portion
46
is seen as extending into the vertical bearing member
36
in FIG.
1
A.
Still referring to
FIG. 4D
, a first gear
50
is connected to the second end portion
46
of the first shaft
44
for rotation in unison therewith. A torsion spring
52
as seen in
FIG. 4D
surrounds the first end portion
45
of the first shaft
44
. First end
53
of spring
52
is connected to the first end portion
45
of the first shaft
44
. Second end portion
54
of spring
52
is connected to sleeve
51
which is affixed to storage roller
40
by pins
56
secured to the storage roller
40
and sleeve
51
. With this construction, it will be apparent to those skilled in the art that a cylindrical tube or storage member
40
and the shaft
44
may be rotationally positioned in a plurality of positions with respect to each other which are dependent on the spring constant and the desired tension between the storage members and the driving roller
70
. This will be referred to hereinafter as pre-tensioning the storage roller
40
relative to the driving roller.
Referring to
FIGS. 4
,
4
A and
4
C, a first idler gear
58
is mounted for rotation about a first idler shaft
59
and it is in meshing engagement with the first gear
50
. The first idler shaft
59
is mounted in the vertical bearing member
36
. A second idler gear
62
is mounted for mounted for rotation about a second idler shaft
63
and gear
62
is in meshing engagement with the first idler gear
58
. The idler shafts are mounted in vertical bearing member
36
. A curtain drive gear
66
is mounted for rotation about a second shaft
67
and it is in meshing engagement with the second idler gear
62
. The second shaft
67
is likewise mounted and supported by vertical bearing member
36
. See, FIG.
1
A.
A curtain engagement member,
70
, sometimes referred to herein as a roller drive
70
, is also mounted on the second shaft
67
for rotation therewith and in unison with the curtain drive gear
66
. The curtain engagement member
70
is provided with pins
72
at each of its two end portions which are rotatively or circumferentially spaced from each other and are adapted to fit into openings
74
in the flexible curtain material so that when the drive roller
70
is driven rotatively, it drives the curtain material either up or down depending upon the direction of rotation.
Referring to
FIGS. 1
,
3
, and
4
, drive motor
76
is mounted in the mechanism and has a drive shaft
77
which in turn is rotatively connected to a drive gear
78
which meshes with the curtain drive gear
66
. Rotation of the drive motor in one direction therefore causes the curtain material to be unrolled from the tube member to cover an opening
25
as illustrated in FIG.
1
and in the opposite direction causes the curtain material
22
to fold up onto storage roller
40
to uncover the opening.
Guides
79
on opposite sides of the structure (see
FIG. 1
) are adapted to receive the outer edges of the flexible curtain material to keep it in position as it moves from its lowermost to its uppermost position. A latch
81
(
FIG. 2
) is adapted to secure the curtain in its lowermost position.
FIGS. 5
,
6
and
7
are simply different showings of how the drive and storing mechanism can be motorized to be driven between its uppermost and lowermost positions. In these figures where the structure is essentially the same as in
FIGS. 1-4
, reference numerals 100 units higher have been designated to illustrate the parts. Drive roller
170
is driven by drive gear
166
which, in turn, is driven by the worm gear drive
86
. Drive gear
166
drives idler gear
162
which drives idler gear
158
. Idler gear
158
drives gear
150
which drives the shaft (not seen).
The mechanism of
FIGS. 5-7
primarily is an alternative to the drive motor
76
shown in the previous drawing and its drive shaft
77
as well as gear
78
. In this showing there has been illustrated a worm gear drive indicated generally by the reference numeral
86
and this worm gear drive includes a worm gear housing
88
and a worm gear reduction housing
90
. See, FIG.
5
. The associated gears (not shown) within these housings are driven from motor
93
. The motor is reversible which enables the mechanism to drive the curtain in either an up direction or a down direction. The drive mechanism in
FIGS. 5-7
illustrates variations in drive mechanisms which can be used to couple the drive roller
170
to the storage roller
140
.
FIG. 4E
illustrates an inverted belt drive
97
operating between pulley
95
affixed to shaft
67
and pulley
96
affixed to shaft
44
. Referring to
FIG. 4C
, rotation of the drive shaft
78
in a clockwise direction results in rotation of shaft
44
in a counterclockwise direction. Similarly, rotation of the drive shaft
67
in a counterclockwise direction results in rotation of shaft
44
in a clockwise direction. Inverted belt drive maintains this relationship because it is inverted. A motor may still be used to operate a gear affixed to shaft
67
but use of the belt would eliminate the need for the idler gears and the gear
50
. The belt would have to be reasonably tight so as to prevent slippage during pre-tensioning. As with the gearing arrangement set forth in
FIG. 4A
, it is necessary that the curtain apertures
74
engage at least two of the cogs
72
to insure tensioning of the curtain and positive driving of the curtain.
FIG. 4F
is an enlarged portion of
FIG. 4B
illustrating the interengagement of cogs/pins
72
of the drive roller with apertures
74
in the flexible curtain.
FIG. 4A
illustrates the storage roller
40
placed rightwardly or rearwardly from the drive roller
70
. This insures that the curtain
22
will sufficiently wrap around roller
70
and constantly engage at least two cogs/pins
72
.
Referring now particuarly to the detailed drawing of
FIG. 4D
, it will be appreciated by those skilled in the art that pre-tensioning of the mechanism is accomplished by rotating the cylindrical tube member
40
relative to the shaft
44
. The curtain
22
is affixed to the storage roller
40
by mushroom headed pins
56
. The storage roller is rotated clockwise as viewed in
FIGS. 4A
or
4
C. Roller
40
rotates clockwise and creates tension in spring
52
as shaft
44
does not turn since the gear train
78
,
66
,
62
,
58
and
50
are locked up through resistance of the gears, the driver roller
70
and the inertia of the drive motor. Sleeve
51
rotates with roller
40
as the curtain is pulled by hand downwardly such that the openings
74
of the curtain material
22
fit over the pins
72
in the drive roller
70
. The relative movement between the storage roller
40
and the shaft
44
creates tension in the torsion spring
52
to a predetermined level and the tension is then maintained by placing the openings
74
over the pins
72
.
Referring to
FIG. 4B
, the curtain
22
extends from the back side of storage roller
40
and engages cogs/pins
72
so as to secure the curtain
22
over the cogs/pins
72
. Cogs/pins
72
are on both sides of the drive roller
70
. Apertures
74
are formed in the curtain
72
where the curtain is folded over onto itself. See, FIG.
4
D. Reference numeral
23
represents the folded portion and stitching
24
secures the folded portion to the main portion of the curtain.
The curtain
22
is positioned by the rotation of the drive roller
70
. Usually, the curtain
22
is a three ply curtain having a reinforced polyester sheet laminated between two polymeric plys. As such, the curtain is usually of lightweight construction.
Referring to
FIG. 4C
, as the curtain drive gear
66
is rotated counterclockwise to bring curtain
22
downwardly, idler gear
62
is rotated clockwise, idler gear
58
is rotated counterclockwise and the first gear
50
connected to shaft
44
is rotated clockwise. As indicated in
FIG. 4C
, all of the gears are the same size such that one rotation of curtain drive gear
66
results in one rotation of first gear
50
in the opposite direction. Any size gears may be used and the relative positioning of the gears may change. It is necessary, however, to maintain the ratio of the drive gear
66
to the first gear
50
in approximately a 1:1 ratio so as to ensure approximately uniform tensioning between the drive roller
70
and the storage roller
40
. The size of the motor drive gear may change without affecting the 1:1 ratio.
From the initial condition of the curtain material
22
being fully stored on the storage roller
40
, and hence the diameter of the stored curtain being larger than the diameter of the drive roller
70
, one counterclockwise rotation of drive gear
66
results in one clockwise rotation of first gear
50
and shaft
44
but roller
40
rotates in the clockwise direction (referring to
FIG. 4C
) less than one rotation thus changing slightly the pretension in the curtain between the storage roller
40
and the drive roller
70
. Those skilled in the art will readily recognize that the diameter of the storage roller
40
, the diameter of the stored curtain material, the spring constant of spring
52
, the size of the gears
50
and
66
, the size of drive roller
70
and its cogs/pins
72
, and the weight of the curtain material
22
will all influence the slight change in pre-tension.
As the shaft
44
and cylindrical tube member
40
are rotated to either bring the curtain material down to cover the opening
25
or to move it in the reverse direction in storing the curtain material on the storage roller
40
, this predetermined tension maintains the curtain material taut between the cogs/pins
72
on the drive roller
70
and the storage roller
40
. As a result, the flexible curtain material is maintained in a neat and orderly wrapped up condition without folds or wrinkles. The tension that is provided between the storage roller
40
and shaft
44
remains essentially constant in unwinding and winding up the curtain material. As discussed earlier, the diameter of the curtain material
22
on the storage roller slightly influences the tension between the storage roller
40
and the drive roller
70
.
Although this invention has been specifically described for use in connection with a flexible material, those skilled in the art will readily recognize that the principles can be applied to other covering such as garage doors or slatted door coverings.
Those skilled in the art will recognize that the invention has been set forth by way of example only and that changes may be made to the invention without departing from the spirit and the scope of the appended claims.
Claims
- 1. A storage and driving mechanism in combination with a covering comprising a rotatable storage roller for storing and dispensing said covering, a rotatable drive shaft, a spring operating between said rotatable storage roller and said rotatable drive shaft, a drive mechanism, said drive mechanism driving said rotatable drive shaft, said rotatable drive shaft being rotated in the same direction as said rotatable storage roller as said covering is dispensed or stored, a drive roller which drives said rotatable drive shaft, said rotatable storage roller and said covering, said drive roller rotating in a direction opposite of said rotatable drive shaft and said rotatable storage roller.
- 2. A storage and driving mechanism as claimed in claim 1 wherein said drive roller includes a drive gear and wherein said rotatable drive shaft includes a shaft gear, and further comprising intermediate gears interconnected to said shaft gear and said drive gear.
- 3. A storage and driving mechanism in combination with a flexible curtain comprising a rotatable storage roller for storing and dispensing said flexible curtain, a rotatable drive shaft, a drive roller, a spring operating between said rotatable storage roller and said rotatable drive shaft, an inverted belt operating between said rotatable drive shaft and said drive roller, said rotatable drive shaft and said rotatable storage roller rotating in a direction opposite to the direction of rotation of said drive roller, and, said rotatable drive shaft being rotated in the same direction as said rotatable storage roller as said curtain is dispensed or stored.
- 4. A storage and driving mechanism in combination with a curtain comprising a storage roller and a drive shaft, said drive shaft having first and second end portions, a spring having a first end affixed to said first end of said drive shaft and having a second end affixed to said roller, said drive shaft affixed to a first gear, a drive roller affixed to a drive gear and driving said curtain, and, said drive gear driving said first gear and imparting torsion to said drive shaft and said spring.
- 5. A storage and driving mechanism as claimed in claim 4 where said storage roller is rotatable relative to said drive shaft and wherein said curtain is a flexible curtain interconnected between said storage roller and said drive roller, said drive roller includes a cog and said curtain includes apertures for interengaging said cogs, said storage roller being rotated relative to said drive shaft pre-tensioning said storage roller relative to said shaft and creating tension in said curtain between said storage roller and said drive roller.
- 6. A storage and driving mechanism in combination with a covering comprising a rotatable storage roller for storing said covering, a rotatable shaft, a spring interconnected between said rotatable shaft and said rotatable storage roller, a rotatable drive roller which includes driving cogs thereon, said covering having apertures therein and residing wound on said rotatable storage roller until being extended therefrom by unwinding said covering and interengaging said apertures of said covering with said cogs of said drive roller pre-tensioning said drive roller with respect to said rotatable shaft, said rotatable shaft and said rotatable storage roller being driven by said drive roller, and, said rotatable shaft and said rotatable storage rolls being driven in the opposite rotational direction of said drive roller maintaining said pre-tension between said drive roller and said rotatable shaft.
- 7. A driving and storing mechanism in combination with flexible curtain material that covers an opening in a structure comprising a cylindrical tube member having an outer cylindrical surface for the reception of a length of curtain material in a rolled up configuration, said curtain member includes openings in the sides thereof, a first shaft having first and second end portions with said first end portion extending coaxially into said tube member, said second end portion of said first shaft extending exteriorly of said tube member, a first gear connected to said second end portion of said first shaft for rotation in unison therewith, a torsion spring surrounding said first end portion of said first shaft and connected at one end portion to said first shaft and at another end portion to said tube member, a first idler gear mounted for rotation about a first idler shaft and in meshing engagement with said first gear, a second idler gear mounted for rotation about a second idler shaft and in meshing engagement with said first idler gear, a curtain drive gear mounted for rotation about a second shaft and in meshing engagement with said second idler gear; a curtain engagement member mounted on said second shaft for rotation therewith and with said curtain drive gear, said curtain engagement member having pins for engagement with said openings in said sides of said curtain material, a drive motor having a drive shaft which in turn is connected to a drive motor gear which meshes with said curtain drive gear, rotation of said drive motor in one direction causes said curtain material to be unrolled from said tube member to cover an opening and in the opposite direction causes said curtain material to be rolled up onto said tube member to uncover said opening.
- 8. A driving and storing mechanism in combination with flexible curtain material that covers an opening in a structure comprising a cylindrical member having a cylindrical surface for the reception of a length of curtain material and adapted for rotational movement, a drive shaft, a spring member having first and second end portions, said first end portion of said spring member connected to said drive shaft and said second end portion of said spring member connected to said cylindrical member, said spring member permitting relative rotational movement between said cylindrical member and said drive shaft, a drive member adapted for rotational movement and having a plurality of curtain engaging members thereon, said length of said curtain material having drive surfaces engageable with said curtain engaging members to move said curtain material between open and closed position relative to said opening upon rotation of said drive member, and, said drive member rotating in the opposite direction of rotation of said drive shaft and said cylindrical member.
- 9. A method of operating a mechanism for storing and driving a covering, the mechanism having a rotatable storage roller, a rotatable drive roller, a first shaft, a spring interconnected between said storage roller and said shaft, said drive roller driving said shaft, comprising the steps of unwinding said covering from said storage roller, pre-tensioning said storage roller with respect to said shaft, placing said covering into engagement with said driver roller, rotating said drive roller dispensing or rewinding said covering, and rotating said shaft in a direction opposite to said drive roller.
- 10. A method of operating a mechanism for storing and driving a flexible curtain, the mechanism having a rotatable storage roller, a first rotatable shaft, a spring interconnected between said storage roller and said first rotatable shaft, a rotatable drive roller, said drive roller driving said shaft and said storage roller, comprising the steps of:unwinding said flexible curtain from said storage roller in a first rotational direction such that said flexible curtain is dispensed from the rearward side of said storage roller; pre-tensioning said storage roller with respect to said shaft; placing said flexible curtain into engagement with said drive roller; driving said rotatable shaft with said drive roller; rotating said drive roller in a direction opposite to said first directional rotation of said storage roller dispensing said flexible curtain from said rotatable storage roller; and, rotating said drive roller in said first rotational direction and rotating said storage roller in the opposite rotational direction rewinding said flexible curtain on said rotatable storage roller.
- 11. A method of storing and driving a flexible curtain as claimed in claim 10 further comprising the steps of:interengaging apertures in said curtain with cogs on said drive roller.
US Referenced Citations (23)