Holding device for mounting an electric transducer

A clamping device for positioning a holding device which is to hold a transducer, particularly a shear-strain gauge, within a tubular structural part, particularly an airplane axle, the transducer including a coil part having two magnet coils spaced apart from each other and a disk part which has a disk which in normal position extends equidistantly between the magnet coils, the holding device comprising two holding rings arranged at a predetermined distance axially from each other, the coil part being secured to a first of the holding rings and the disk part being secured to a second of the holding rings, the improvement wherein

• both of the holding rings are developed with radial resilience and with a smaller outside diameter than an inside diameter of the tubular structural part and have radially protruding holding lugs which rest under initial spring tension against an inner wall of the tubular structural part;
• and wherein
• each of the holding rings have support parts, the coil part being secured by a support part of said first holding ring and the disk part being secured by a support part of said second holding ring;
• and wherein
• said holding rings have circular extensions for gripping, said clamping device providing for radially inward clamping of the holding rings of said holding device;
• said clamping device comprising:
• two clamping jaws which are movable radially towards each other and are provided at their radially outward directed ends with gripping hooks which are arranged approximately in circumferential direction and by which the circular extensions of the holding rings can be gripped from behind.