Roof micrometer and warning instrument

Claim 2

A displacement detecting device for mine roofs and the like comprising an elongated support member adapted for anchored reception within a roof bore, an earth engaging anchor at one end of the support member constituting the inner bore received end thereof, a bracket mounted on the second or outer end of the support member, a housing slidably mounted on the support member inward of the bracket, resilient biasing means engaged between the bracket and the housing for resiliently maintaining the housing against the roof surface, a switch mounted within said housing and including an exposed outwardly directed switch key, signal means operated by said switch, and a switch actuator mounted on said bracket and in inwardly directed aligned spaced relation to said switch key for a selective actuation of the switch upon an outward movement of the earth against which the housing is engaged for movement of the housing against the biasing force of the biasing means to engage the switch key against the actuator, said actuator being in the nature of an adjustable micrometer for selective adjustment toward and away from said switch key to vary the distance therebetween and the point of engagement therebetween.

Claim 3

The device of claim 1 wherein said housing includes an elongated guide tube fixed thereto and projecting inwardly in surrounding relation to said support member, said switch being pivotally and resiliently mounted within said housing to compensate for excessive loads introduced thereto by engagement of the actuator against the switch key.

Claim 4

The device of claim 2 including a second bracket mounted adjacent the outer end of said support member, a second actuator mounted on said second bracket, and a transducer for generating a signal proportional to linear displacement oF the roof, said transducer being mounted on said housing and in engagement with the second actuator for continued movement toward the second actuator upon displacement of the housing.

Claim 5

The device of claim 3 wherein each bracket is longitudinally adjustable along said support member.

Claim 6

A displacement detecting device for mine roofs and the like comprising an elongated support member adapted for anchored reception within a roof bore, an earth engaging anchor at one end of the support member constituting the inner bore received end thereof, a bracket mounted on the second or outer end of the support member, a housing slidably mounted on the support member inward of the bracket resilient biasing means engaged between the bracket and the housing for resiliently maintaining the housing against the roof surface, a switch mounted within said housing and including an exposed outwardly directed switch key, signal means operated by said switch, and a switch actuator mounted on said bracket and in inwardly directed aligned spaced relation to said switch key for a selective actuation of the switch upon an outward movement of the earth against which the housing is engaged for movement of the housing against the biasing force of the biasing means to engage the switch key against the actuator, said switch being pivotally and resiliently mounted within said housing to compensate for excessive loads introduced thereto by engagement of the actuator against the switch key.

Claim 7

A displacement detecting device for mine roofs and the like comprising an elongated support member adapted for anchored reception within a roof bore, an earth engaging anchor at one end of the support member constituting the inner bore received end thereof, a bracket mounted on the second or outer end of the support member, a housing slidably mounted on the support member inward of the bracket resilient biasing means engaged between the bracket and the housing for resiliently maintaining the housing against the roof surface, a switch mounted within said housing and including an exposed outwardly directed switch key, signal means operated by said switch, and a switch actuator mounted on said bracket and in inwardly directed aligned spaced relation to said switch key for a selective actuation of the switch upon an outward movement of the earth against which the housing is engaged for movement of the housing against the biasing force of the biasing means to engage the switch key against the actuator, said switch being pivotally and resiliently mounted within said housing to compensate for excessive loads introduced thereto by engagement of the actuator against the switch key.

Claim 8

A displacement detecting device for mine roofs and the like comprising an elongated support member adapted for anchored reception within a roof bore, an earth engaging anchor at one end of the support member constituting the inner bore received end thereof, a bracket mounted on the second or outer end of the support member, a housing slidably mounted on the support member inward of the bracket, resilient biasing means engaged between the bracket and the housing for resiliently maintaining the housing against the roof surface, a switch mounted within said housing and including an exposed outwardly directed switch key, signal means operated by said switch, a switch actuator mounted on said bracket and in inwardly directed aligned spaced relation to said switch key for a selective actuation of the switch upon an outward movement of the earth against which the housing is engaged for movement of the housing against the biasing force of the biasing means to engage the switch key against the actuator, a second bracket mounted adjacent the outer end of said support member, a second actuator mounted on said second bracket, and a transducer for generating a signal proportional to linear displacement of the roof, said transducer being mounted on said housing and in engagement with the second actuator for continued movement toward the second actuator upon displacement of the housing.

Claim 9

A displacement detecting device for mine roofs and the like comprising an elongated support member adapted for anchored reception within a roof bore, an earth engaging anchor at one end of the support member constituting the inner bore received end thereof, a bracket mounted on the second or outer end of the support member, a housing slidably mounted on the support member inward of the bracket, resilient biasing means engaged between the bracket and the housing for resiliently maintaining the housing against the roof surface, a switch mounted within said housing and including an exposed outwardly directed switch key, signal means operated by said switch, a switch actuator mounted on said bracket and in inwardly directed aligned spaced relation to said switch key for a selective actuation of the switch upon an outward movement of the earth against which the housing is engaged for movement of the housing against the biasing force of the biasing means to engage the switch key against the actuator, a second bracket mounted adjacent the outer end of said support member, a second actuator mounted on said second bracket, and a transducer for generating a signal proportional to linear displacement of the roof, said transducer being mounted on said housing and in engagement with the second actuator for continued movement toward the second actuator upon displacement of the housing.

Claim 10

A displacement detecting device for mine roofs and the like comprising an elongated support member adapted for anchored reception within a roof bore, an earth engaging anchor at one end of the support member constituting the inner bore received end thereof, a bracket mounted on the second or outer end of the support member, a housing slidably mounted on the support member inward of the bracket, resilient biasing means engaged between the bracket and the housing for resiliently maintaining the housing against the roof surface, a switch mounted within said housing and including an exposed outwardly directed switch key, signal means operated by said switch, and a switch actuator mounted on said bracket and in inwardly directed aligned spaced relation to said switch key for a selective actuation of the switch upon an outward movement of the earth against which the housing is engaged for movement of the housing against the biasing force of the biasing means to engage the switch key against the actuator, said bracket being adjustable longitudinally along said support member, and means for selectively locking said bracket in any adjusted positIon thereout.

Claim 11

A displacement detecting device for mine roofs and the like comprising an elongated support member adapted for anchored reception within a roof bore, an earth engaging anchor at one end of the support member constituting the inner bore received end thereof, a bracket mounted on the second or outer end of the support member, a housing slidably mounted on the support member inward of the bracket, resilient biasing means engaged between the bracket and the housing for resiliently maintaining the housing against the roof surface, a switch mounted within said housing and including an exposed outwardly directed switch key, signal means operated by said switch, and a switch actuator mounted on said bracket and in inwardly directed aligned spaced relation to said switch key for a selective actuation of the switch upon an outward movement of the earth against which the housing is engaged for movement of the housing against the biasing force of the biasing means to engage the switch key against the actuator, said bracket being adjustable longitudinally along said support member, and means for selectively locking said bracket in any adjusted positIon thereout.