US 12,240,025 B2
Sheet transitioning in spiral formed structures
Rosalind K. Takata, Denver, CO (US); Loren Daniel Bridgers, Golden, CO (US); and Eric D. Smith, Denver, CO (US)
Assigned to KEYSTONE TOWER SYSTEMS, INC., Denver, CO (US)
Filed by KEYSTONE TOWER SYSTEMS, INC., Denver, CO (US)
Filed on Dec. 19, 2022, as Appl. No. 18/084,368.
Application 18/084,368 is a continuation of application No. 17/038,059, filed on Sep. 30, 2020, granted, now 11,529,661.
Application 17/038,059 is a continuation of application No. 16/692,523, filed on Nov. 22, 2019, granted, now 10,807,136, issued on Oct. 20, 2020.
Application 16/692,523 is a continuation of application No. 16/183,231, filed on Nov. 7, 2018, granted, now 10,486,212, issued on Nov. 26, 2019.
Application 16/183,231 is a continuation of application No. 15/692,461, filed on Aug. 31, 2017, granted, now 10,201,841, issued on Feb. 12, 2019.
Claims priority of provisional application 62/381,749, filed on Aug. 31, 2016.
Prior Publication US 2023/0201901 A1, Jun. 29, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B21C 37/18 (2006.01); B23K 31/02 (2006.01); E04H 12/08 (2006.01)
CPC B21C 37/185 (2013.01) [B23K 31/027 (2013.01); E04H 12/08 (2013.01); Y02E 10/728 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A structure comprising:
a first curved sheet having a pair of first longitudinal edges parallel to one another; and
a second curved sheet having a pair of second longitudinal edges, the first curved sheet and the second curved sheet forming at least a portion of a tapered conical segment, and the first curved sheet and the second curved sheet joined to one another along a first seam extending in a spiral and along a second seam oblique to the first seam, and the first curved sheet and the second curved sheet differing in thickness from one another along the second seam, wherein the pair of the second longitudinal edges of the second curved sheet are parallel to one another, and one of the second longitudinal edges of the second curved sheet abuts another one of the second longitudinal edges of the second curved sheet at an intersection of the first seam and the second seam.