US3878879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll-up door
Assignee: Nomafa AB
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Filing: 1973-08-14
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Granted: 1975-04-22
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Expires: 1993-08-14
Abstract
Abstract In a roll-up door having a flexible door-leaf arranged to be wound about a roller for closing and opening the door, means for maintaining said door-leaf in a stretched condition laterally, said means including trolleys running in guide rails provided in vertical side frames, and means for maintaining said door-leaf in a stretched condition vertically, said means including a movable pulley loaded by a weight, said weight being divided into two opposing load components by a wire running from the trolley around two stationary pulleys and over said loaded movable pulley to a winding drum supported on the shaft of said roll-up roller.
Inventors
- 👤 Bernt Hugo Manns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:33
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/56; E06B9/58; E06B9/62
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
216 words
An improved roll-up door including a flexible door-leaf, a roller onto which said door is wound, first and second vertical side frames, guide means supported by said side frames for guiding said door during vertical movement, trolleys in said frames for maintaining said door in stretched condition laterally, the improvement comprising first and second pulleys, arranged in said vertical side frames respectively, first and second weights respectively secured to said pulleys for maintaining said flexible door in stretched condition in the vertical direction and simultaneously balancing said door, a groove in each of said pulleys, first and second ropes running in said respective grooves in each of said pulleys, first and second winding drums respectively at the ends of said roll-up roller, and first and second stationary pulleys in said frames, each of said ropes arranged to divide said respective weight into two opposing load components, one through the connection of one of the rope ends to said respective winding drum and the other one through the connection of the remaining rope end to said trolley via said first and second stationary pulleys, each of said ropes being respectively wound onto and off its respective winding drum in a direction opposite to the winding-on and winding-off directions of the door-leaf onto and off said roll-up roller.
Claim 2
Dependent Claim
216 words
An improved roll-up door including a flexible door-leaf, a roller onto which said door is wound, first and second vertical side frames, guide means supported by said side frames for guiding said door during vertical movement, trolleys in said frames for maintaining said door in stretched condition laterally, the improvement comprising first and second pulleys, arranged in said vertical side frames respectively, first and second weights respectively secured to said pulleys for maintaining said flexible door in stretched condition in the vertical direction and simultaneously balancing said door, a groove in each of said pulleys, first and second ropes running in said respective grooves in each of said pulleys, first and second winding drums respectively at the ends of said roll-up roller, and first and second stationary pulleys in said frames, each of said ropes arranged to divide said respective weight into two opposing load components, one through the connection of one of the rope ends to said respective winding drum and the other one through the connection of the remaining rope end to said trolley via said first and second stationary pulleys, each of said ropes being respectively wound onto and off its respective winding drum in a direction opposite to the winding-on and winding-off directions of the door-leaf onto and off said roll-up roller.
Claim 3
Dependent Claim
216 words
An improved roll-up door including a flexible door-leaf, a roller onto which said door is wound, first and second vertical side frames, guide means supported by said side frames for guiding said door during vertical movement, trolleys in said frames for maintaining said door in stretched condition laterally, the improvement comprising first and second pulleys, arranged in said vertical side frames respectively, first and second weights respectively secured to said pulleys for maintaining said flexible door in stretched condition in the vertical direction and simultaneously balancing said door, a groove in each of said pulleys, first and second ropes running in said respective grooves in each of said pulleys, first and second winding drums respectively at the ends of said roll-up roller, and first and second stationary pulleys in said frames, each of said ropes arranged to divide said respective weight into two opposing load components, one through the connection of one of the rope ends to said respective winding drum and the other one through the connection of the remaining rope end to said trolley via said first and second stationary pulleys, each of said ropes being respectively wound onto and off its respective winding drum in a direction opposite to the winding-on and winding-off directions of the door-leaf onto and off said roll-up roller.
Claim 4
Dependent Claim
216 words
An improved roll-up door including a flexible door-leaf, a roller onto which said door is wound, first and second vertical side frames, guide means supported by said side frames for guiding said door during vertical movement, trolleys in said frames for maintaining said door in stretched condition laterally, the improvement comprising first and second pulleys, arranged in said vertical side frames respectively, first and second weights respectively secured to said pulleys for maintaining said flexible door in stretched condition in the vertical direction and simultaneously balancing said door, a groove in each of said pulleys, first and second ropes running in said respective grooves in each of said pulleys, first and second winding drums respectively at the ends of said roll-up roller, and first and second stationary pulleys in said frames, each of said ropes arranged to divide said respective weight into two opposing load components, one through the connection of one of the rope ends to said respective winding drum and the other one through the connection of the remaining rope end to said trolley via said first and second stationary pulleys, each of said ropes being respectively wound onto and off its respective winding drum in a direction opposite to the winding-on and winding-off directions of the door-leaf onto and off said roll-up roller.
Claim 5
Dependent Claim
17 words
An improved roll-up door as claimed in claim 1, wherein said door-leaf is made from a fabric.
Claim 6
Dependent Claim
18 words
An improved roll up door as claimed in claim 2, wherein said fabric is coated with polyvinyl chloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |