A fibre reinforced resin composite leaf spring for determining the magnitude of a load
US4411159A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1981 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Jul 10, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G2401/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A member of composite material incorporates at least one strain responsive member within a part at which a strain is induced by a load in use. A signal which is a function of a strain detetected by the strain responsive member is communicated to an indicator or monitoring device which registers the applied load causing the strain. In one embodiment a leaf spring for a vehicle comprises upper and lower elements of one or more superimposed strips of pre-impregnated longitudinally extending carbon fibres and an inner element of one or more strips of pre-impregnated glass fibres. During laying up of the strips two strain gauges (13, 14), which may be on or integral with a carrier strip, and their leads (13a, 13b, 14a, 14b) are introduced into the active length of the spring which experiences a bending moment on the application of a load. The gauges are positioned at a pre-determined distance apart which is maintained when the member is cured, as by hot press moulding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.