Listening device particularly for the investigation of noises emanating from pipes through which materials flow and from machines

摘要

590,744. Listening devices. KELLENBERGER, K. March 29, 1945, No. 7932. Convention date, Nov. 23, 1943. [Class 81 (ii) ] A device for listening to noises emanating from machinery &c. of the type comprising a sound receiving contact member 7, a transmitting stem 1 and a diaphragm 4 mounted in a sound box 2 is characterized by means, such as a member 5, for rigidly connecting the diaphragm to the stem, and by means of supporting the edge portion of the diaphragm by the stem via sound insulation means; as shown, elastic packing 6 is employed. The diaphragm is mounted in the sound box between rubber rings.. One or more of the stem members may be curved or cranked, and provided with flexible joints. The member 7 may be shaped to fit the surface to be investigated. ,