Title: Load measuring system for leaf spring suspensions

Abstract: A system for measuring the load carried by a vehicle of the type employing a leaf spring suspension. In a leaf spring suspension an elongated spring is supported between a pair of spaced apart hangers on each side of the vehicle. The hangers are then secured to the vehicle frame. An axle extends transversely beneath the vehicle and is clamped to the center of the springs. The measuring system includes four spaced apart strain gauges mounted on the upper surface of the spring beneath the axle clamp equidistant from the center of the spring. The strain gauges are connected to each other in a bridge configuration, and they measure the strain of the springs responsive to vehicle loading.

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Inventors: Hagedorn, Thomas H. (Seattle, WA, US)
DeForrest, Allen L. (Auburn, WA, US)

Application Number: 962207
Filing Date: 1978-11-20
Publication_date: 1980-08-05
Assignee: Structural Instrumentation, Inc. (Tukwila, WA)
Primary Class(es): 177/137 177/211
Other Classes:
US Patent Ref:

2813709	Nov, 1957	Brier	177/137.
3241626	Mar, 1966	Woodburn	177/137.
3724571	Apr, 1973	Thorn et al.	177/137.
3743041	Jul, 1973	Videon	177/211.
3794130	Feb, 1974	Malgren et al.	177/137.
3934663	Jan, 1976	Johansson	177/137.
3935915	Feb, 1976	Seilly et al.	177/211.
4020911	May, 1977	English et al.	177/136.

Other Refs:
Primary Examiner: Miller, Jr., George H.
Assistant Examiner:
Attorney: Seed, Berry, Vernon & Baynham