US5129442A — Roll-up industrial door having a combined pulley …

Claim 1

Independent Claim 176 words

A roll-up door construction for enclosing a doorway in a building, comprising rotatable drum means mounted on the building above the doorway, a flexible door panel disposed to be wound on said drum means and adapted to be moved between a rolled-up open position and an unrolled closed position, a first belt having a first end secured to said drum and wound on said drum in a plurality of overlapping convolutions, a second belt having a first end secured to said drum and wound in a plurality of overlapping convolutions, said belts disposed in a common vertical plane and each convolution of said first belt being separated from adjacent convolutions of said first belt by convolutions of said second belt, counterbalancing means attached to said first belt intermediate the ends thereof for exerting a rotational force on said drum means to urge said door panel to the open position, and resilient means connected to said second belt for exerting a downward biasing force on said door panel when said door panel is in the closed position.

Claim 2

Dependent Claim 176 words

A roll-up door construction for enclosing a doorway in a building, comprising rotatable drum means mounted on the building above the doorway, a flexible door panel disposed to be wound on said drum means and adapted to be moved between a rolled-up open position and an unrolled closed position, a first belt having a first end secured to said drum and wound on said drum in a plurality of overlapping convolutions, a second belt having a first end secured to said drum and wound in a plurality of overlapping convolutions, said belts disposed in a common vertical plane and each convolution of said first belt being separated from adjacent convolutions of said first belt by convolutions of said second belt, counterbalancing means attached to said first belt intermediate the ends thereof for exerting a rotational force on said drum means to urge said door panel to the open position, and resilient means connected to said second belt for exerting a downward biasing force on said door panel when said door panel is in the closed position.

Claim 3

Dependent Claim 14 words

The construction of claim 1, wherein each belt has a greater width than thickness.

Claim 4

Dependent Claim 21 words

The construction of claim 1, wherein said drum means includes a pulley, both of said belts being wound on said pulley.

Claim 5

Dependent Claim 89 words

The construction of claim 1, wherein a portion of said first belt located between said first end and the attachment of the counterbalancing means to said first belt extends tangentially to said drum means at a first point of tangency, a portion of said second belt located between the first end of said second belt and the attachment of said resilient means extending tangentially to said drum means at a second point of tangency, said second point of tangency being less than 180° from said first point of tangency.

Claim 6

Dependent Claim 21 words

The construction of claim 4, wherein said second point of tangency is located approximately 90° from said first point of tangency.

Claim 7

Dependent Claim 12 words

The construction of claim 1, wherein said resilient means comprises a spring.

Claim 8

Dependent Claim 13 words

The construction of claim 1, wherein said counterbalancing means comprises a counterbalancing weight.

Claim 9

Dependent Claim 31 words

The construction of claim 1, and including a rigid beam connected to the lower end of said door panel, a second end of said second belt being connected to said beam.

Claim 10

Dependent Claim 165 words

A roll-up door construction for enclosing a doorway in a building, comprising a cylindrical drum mounted on the building above the doorway, a pair of annular plates secured in spaced relation to the outer surface of said drum and defining a pulley, a flexible door panel disposed to be wound on said drum and adapted to be moved between a rolled-up open position and an unrolled closed position, a pair of belts each wound in a plurality of overlapping convolutions on said pulley, the convolutions of a first of said belts being separated from adjacent convolutions of said first belt by convolutions of said second belt, each belt having a greater width than thickness, counterbalancing means attached to said first belt for exerting a rotational force on said drum to urge the door panel to the open position, and resilient means connected to said second belt for exerting a downward biasing force on said door panel when the door panel is in the closed position.

Claim 11

Dependent Claim 165 words

A roll-up door construction for enclosing a doorway in a building, comprising a cylindrical drum mounted on the building above the doorway, a pair of annular plates secured in spaced relation to the outer surface of said drum and defining a pulley, a flexible door panel disposed to be wound on said drum and adapted to be moved between a rolled-up open position and an unrolled closed position, a pair of belts each wound in a plurality of overlapping convolutions on said pulley, the convolutions of a first of said belts being separated from adjacent convolutions of said first belt by convolutions of said second belt, each belt having a greater width than thickness, counterbalancing means attached to said first belt for exerting a rotational force on said drum to urge the door panel to the open position, and resilient means connected to said second belt for exerting a downward biasing force on said door panel when the door panel is in the closed position.

Claim 12

Dependent Claim 19 words

The construction of claim 9, wherein each belt has a width slightly less than the spacing between said plates.

Claim 13

Dependent Claim 21 words

The construction of claim 9, wherein the inner ends of the belts are connected to the same location on the drum.

Claim 14

Dependent Claim 171 words

A roll-up door construction for enclosing a doorway in a building, comprising a cylindrical rotatable drum mounted on the building above the doorway, a flexible door panel disposed to be wound on said drum and adapted to be moved between a rolled-up open position and an unrolled closed position, a pulley connected to each end of the drum, a pair of belts each having an inner end connected to the pulley and each belt being wound in a plurality of overlapping convolutions on said pulley, each convolution of one of said belts being separated from adjacent convolutions of said one belt by the convolutions of the other belt, counterbalancing means attached to a first of said belts intermediate the ends thereof for exerting a rotational force on the drum to urge said door panel to the open position, and resilient means connected to a second of said belts intermediate the ends thereof for exerting a downward biasing force on the door panel when the door panel is in the closed position.

Claim 15

Dependent Claim 171 words

A roll-up door construction for enclosing a doorway in a building, comprising a cylindrical rotatable drum mounted on the building above the doorway, a flexible door panel disposed to be wound on said drum and adapted to be moved between a rolled-up open position and an unrolled closed position, a pulley connected to each end of the drum, a pair of belts each having an inner end connected to the pulley and each belt being wound in a plurality of overlapping convolutions on said pulley, each convolution of one of said belts being separated from adjacent convolutions of said one belt by the convolutions of the other belt, counterbalancing means attached to a first of said belts intermediate the ends thereof for exerting a rotational force on the drum to urge said door panel to the open position, and resilient means connected to a second of said belts intermediate the ends thereof for exerting a downward biasing force on the door panel when the door panel is in the closed position.

Claim 16

Dependent Claim 35 words

The construction of claim 12, and including a pair of second pulleys associated with each second belt and constructed and arranged to divide the force exerted by said resilient means into two opposite load components.

Claim 17

Dependent Claim 17 words

The construction of claim 13, and including adjustment means for adjusting the force of said resilient means.

Claim 18

Dependent Claim 30 words

The construction of claim 12, and including drive means operably connected to said drum for rotating the drum to thereby move the door panel between the open and closed positions.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-07-14	1996-01-13	1996-07-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-07-14	2000-01-13	2000-07-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-07-14	2004-01-13	2004-07-14	$7700.00	Window Closed / Lapsed

Roll-up industrial door having a combined pulley for counterweight and spring tension belts

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