# US 2024/0200403 A1 · Rollup door tension device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0200403 A1 - Document ID: US20240200403A1 - Status: Published application - Kind: A1 - Application number: 18/068,635 - Filed: 2022-12-20 - Published: 2024-06-20 - Earliest claimed: 2022-12-20 - Assignees: Snl Steel LLC - Applicants: Snl Steel LLC - Inventors: Michael HUMPHREY; Dylan PETTIT; Mike STANICK; John BUTTERICK - Web page: https://patentgrep.com/patent/US20240200403A1 ## CPC - E06B 9/60: Spring drums operated only by closure members - E06B 9/17: Parts or details of roller shutters, e.g. suspension devices, shutter boxes, wicket doors, ventilation openings - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) ## Abstract The torsion spring is disposed around an axle/shaft and fixed to the axle/shaft at one end, such that the torsion spring rotates with the door drum and fixed to a spring plate as a stationary structure at the other end. The spring plate does not rotate while the torsion spring rotates. The torsional forces created in the spring by the rotation of the door drum provides a variable torque which counteracts the weight of the flexible door. As the flexible door is lowered, the torsional forces developed in the spring pull in the opposite direction of the travel of the flexible door. The amount of tension resulting from the torsional forces generated in the torsion spring determines the performance characteristics of the flexible door. ## Claims ### Claim 1 A door package assembly for a rollup door, comprising: an axle; a spring plate positioned about the axle and attached to the axle; a spring having a first end and a second end, positioned about the axle, and attached to the spring plate at the first end; a door drum positioned about the axle and attached to the second end of the spring; and a tube attached to an outer edge of the door drum. ### Claim 2 (depends on 1) The door package assembly of claim 1, further comprising: a tension device attached to an end of the axle, the tension device configured to provide a pre-set tension to the spring. ### Claim 3 (depends on 2) The door package assembly of claim 2, wherein the tension device comprises: a ratchet wheel attached to the end of the axle; and a latch attached to a fixed bracket and engageable with teeth of the ratchet wheel. ### Claim 4 (depends on 1) The door package assembly of claim 1, further comprising: wherein the door drum is attached to the one end of the spring and the spring plate is attached to the other end of the spring; wherein the door drum rotates when the rollup door moves but spring plate does not rotate; the tube wrapping around the spring and the spring plate and connecting to the door drum; and the axle passing through the spring and the tube and connected to the spring plate. ### Claim 5 (depends on 4) The door package assembly of claim 4, wherein the spring plate is welded to the axle. ### Claim 6 (depends on 4) The door package assembly of claim 4, wherein a tension in the spring is increased by rotating the door drum in one direction, and the tension in the spring is decreased by rotating the door drum in reverse direction. ### Claim 7 (depends on 6) The door package assembly of claim 6, wherein the door drum is rotated in one direction and the spring attached to the door drum is coiled in the same direction. ### Claim 8 (depends on 4) The door package assembly of claim 4, wherein the spring is disposed around the axle and attached to the door drum and the spring plate using a bolt. ### Claim 9 (depends on 4) The door package assembly of claim 4, wherein the rollup door is wound up around the HVCA tube. ### Claim 10 (depends on 4) The door package assembly of claim 4, wherein a tension device locks the axle in the fixed position. ### Claim 11 (depends on 4) The door package assembly of claim 4, wherein a tension device embraces a bracket and an assembled tension device. ### Claim 12 (depends on 4) The door package assembly of claim 4, wherein rivets are used to attach the door drum to the tube. ### Claim 13 (depends on 4) The door package assembly of claim 4 further comprising a vertical guide as to support the door package assembly on the top of the rollup door. ### Claim 14 A door package assembly for a rollup door, comprising: a tension device having a bracket and a tension device plate; a door drum connecting to the bracket; and a spring incorporating the door drum and a spring plate, wherein the door drum is attached to the one end of the spring and the spring plate is attached to the other end of the spring, and the spring plate being fixed to the axle. ### Claim 15 (depends on 14) The door package assembly of claim 14, wherein a steel pin and a cotter pin are used to attach the tension device plate into the bracket. ### Claim 16 A door package assembly for a rollup door, comprising: a bar with hexagonal bolt welded on the end of the door package assembly; a tension device plate attached to the bar with hexagonal bolt; a spring attached to the bar with hexagonal bolt at the end of the spring through the tension device plate; and a latch gearing into the teeth of the tension device, wherein the bar with hexagonal bolt and the tension device plate rotates in one direction for a pre-loaded torsion of the spring. ### Claim 17 (depends on 16) The door package assembly of claim 16, wherein the bar with hexagonal bolt locking in place of the spring. ### Claim 18 (depends on 16) The door package assembly of claim 16, wherein the amount of the torsion pre-loaded in the spring is increased by rotating a bar with hexagonal bolt. ### Claim 19 (depends on 16) The door package assembly of claim 16, wherein the bar with hexagonal bolt is rotated using a wrench or socket wrench. ### Claim 20 (depends on 16) The door package assembly of claim 16, wherein the bar with hexagonal bolt rotates in a reverse direction when ring-shaped latch is lifted from the gear.