Mine equipment

Details Mine equipment Mine equipment

1977-03-17

1978-06-27

Ruehl, Charles A.

Measuring and testing

Miscellaneous

340421, G01B 714

Patent

active

040967530

ABSTRACT:
Mine equipment for measuring conveyor advance includes two roof support assemblies and control means to ensure each of the assemblies can be advanced only when the other assembly is anchored. The two assemblies are linked by a transducer which senses movement of one of the assemblies relative to the other assembly.

REFERENCES:
patent: 3159003 (1964-12-01), Kearsley
patent: 3246730 (1966-04-01), Bolton et al.
patent: 3341843 (1967-09-01), Walsh
patent: 3412391 (1968-11-01), Ward
patent: 3482877 (1969-12-01), Jacobi

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