Abstract: The present disclosure relates to a cutting bit carrier for hard rock mining applications. Usually, replacing worn cutting bits may take much effort and may be time consuming. The present cutting bit carrier may comprise a first carrier member including a first supporting portion configured to contact a cutting bit shank of a cutting bit for supporting the cutting bit, and a second carrier member including a second supporting portion configured to contact the cutting bit shank of the cutting bit for supporting the cutting bit. The second carrier member may be detachably mountable to the first carrier member.

Abstract: A force measuring unit for measuring a force applied to an individual chain link of a chain strand is used in underground mining applications. The force measuring unit may include a housing having a first end configured to be contacted by a first chain link leg and a second end configured to be contacted by a second chain link leg, and a distance measuring device accommodated within the housing and configured to measure an actual distance between the first chain link leg and the second chain link leg. The distance measuring device may include a first unit part configured to be contacted by the first chain link leg and a second unit part configured to be contacted by the second chain link leg.

Abstract: A force measuring unit for measuring a force applied to an individual chain link of a chain strand is used in underground mining applications. The force measuring unit may include a housing having a first end configured to be contacted by a first chain link leg and a second end configured to be contacted by a second chain link leg, and a distance measuring device accommodated within the housing and configured to measure an actual distance between the first chain link leg and the second chain link leg. The distance measuring device may include a first unit part configured to be contacted by the first chain link leg and a second unit part configured to be contacted by the second chain link leg.

Abstract: An appliance for optical signal transmission using optical waveguides in explosion-hazard areas, in particular in underground mining, includes an optical transmitter, having an optical output interface for connection of an optical waveguide transmission path and having a device for limiting the light power. An arrangement for bi-directional optical signal transmission is also provided. In order to provide an appliance for optical signal transmission as well as an arrangement for bi-directional optical signal transmission in explosion-hazard areas, complying with the requirements for intrinsically safe operation of the transmission medium when separating or decoupling the transmission medium, the device for limiting the light power is a passive optical component which is connected in the optical signal path between the optical transmitter and the optical output interface.