Apparatus for remotely operating self-advancing supports or the

Details Apparatus for remotely operating self-advancing supports or the Apparatus for remotely operating self-advancing supports or the

1977-07-27

1979-01-02

Shapiro, Jacob

Hydraulic and earth engineering

Earth treatment or control

Shoring, bracing, or cave-in prevention

91 1, 405302, E21D 1544

Patent

active

041320794

ABSTRACT:
Apparatus for remotely operating self-advancing supports or the like at a long-walled pit face of a coal mine comprises a receiver attached to every group of the supports which are arranged in front of and along the long-walled pit face, each of the receivers having a specific frequency, hydraulic cylinders attached to the support for causing the support to be operated, electromagnetic valves connected to the receiver to control the hydraulic cylinders, and a portable operating means including keys for specifying the groups of the supports, key switches for specifying the supports to be operated, and a transmitting circuit having operating switches, wherein operating signals are applied from the operating means via the radio system to the receivers.

REFERENCES:
patent: 3495499 (1970-02-01), Ward
patent: 3821880 (1974-07-01), Weirich
patent: 4050256 (1977-09-01), Phillips

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