DEVICE FOR DETERMINING ROOF ROCK DEFORMATIONS Russian patent published in 2011 - IPC E21C39/00 

FIELD: mining.

SUBSTANCE: device includes central bar consisting of rods attached to each other by means of threaded connection. Washer with spherical surface against which a movable stock of sensor is borne is fixed on end rod. Head element and coaxially fixed spacer elastic elements are fixed on central bar. At that, sensor is equipped with additional spacer elastic elements. Deformation transfer element is arranged inside the sensor and made in the form of the stock the upper part of which is borne against the washer fixed on end rod, and lower part is rigidly attached to support spring attached to the sensor. For adjustment of zero position the adjustment screw is provided which is installed with a stop coaxially to movable sensor stock. Linear movement converter is made in the form of a line of reed relays and magnetic belt. Line of reed relays is fixed in fixed sensor body in the form of plates with reed relays made from dielectric material and arranged on the rod with a pitch equal to the required measurement accuracy. Reed relays are connected to indication unit which records the closing sequence of contacts of reed relays of recording instrument by means of multi-strand cable. Magnetic belt is fixed on movable stock.

EFFECT: higher operating reliability of the device and simpler design of the device.

1 dwg