A curved side piece of a vehicle chassis, to which the front springs are attached.
〈史〉（车辆底盘上的）副钢板弹簧支架
Example sentencesExamples
Although it's got the chassis number on the dumb iron, I need the plate for inside the cab.
This method does away with the need to drill holes and weld crush tubes in the dumb iron itself, and spreads the steering loads over a much larger area of the chassis rail.
While the dumb irons are in the same spot they are too wide and extend to far forward when fitted to a series chassis.
However, the hinges were on the inexpensive, household door variety welded to the dumb irons and radiator cowling.
The dumb irons on my car were a bit on the flimsy side, so reinforcement plates were welded prior to drilling.
Definition of dumb iron in US English:
dumb iron
noun
historical
A curved side piece of a vehicle chassis, to which the front springs are attached.
〈史〉（车辆底盘上的）副钢板弹簧支架
Example sentencesExamples
This method does away with the need to drill holes and weld crush tubes in the dumb iron itself, and spreads the steering loads over a much larger area of the chassis rail.
The dumb irons on my car were a bit on the flimsy side, so reinforcement plates were welded prior to drilling.
However, the hinges were on the inexpensive, household door variety welded to the dumb irons and radiator cowling.
Although it's got the chassis number on the dumb iron, I need the plate for inside the cab.
While the dumb irons are in the same spot they are too wide and extend to far forward when fitted to a series chassis.