US 12,448,014 B2
Railroad car truck side frame
Benjamin T. Woods, Lockport, IL (US)
Assigned to Transportation IP Holdings, LLC, Norwalk, CT (US)
Filed by Transportation IP Holdings, LLC, Norwalk, CT (US)
Filed on Sep. 12, 2022, as Appl. No. 17/931,347.
Application 17/931,347 is a continuation of application No. 16/378,932, filed on Apr. 9, 2019, granted, now 11,479,276.
Claims priority of provisional application 62/675,951, filed on May 24, 2018.
Prior Publication US 2023/0001963 A1, Jan. 5, 2023
Int. Cl. B61F 5/52 (2006.01); B61F 5/30 (2006.01)
CPC B61F 5/52 (2013.01) [B61F 5/301 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A railroad car side frame comprising:
a top member;
a bottom member spaced apart from the top member, the bottom member including a spring seat;
a front column connecting the top member and the bottom member, the front column having an inner wall; and
a rear column connecting the top member and the bottom member and spaced apart from the front column, the rear column having an inner wall,
wherein the inner wall of the front column and/or the inner wall of the rear column includes:
(1) a first area having a first thickness;
(2) a second area having a second thickness that is greater than the first thickness;
(3) a third area having a third thickness that is greater than the second thickness;
(4) a fourth area having a fourth thickness that is greater than the third thickness;
(5) a first transition area from the first area to the second area;
(6) a second transition area from the second area to the third area; and
(7) a third transition area from the third area to the fourth area.