Apparatus for distant observation of oscillations of objects

Abstract

Abstract 308,247. Ganz - Fele Villamossagi Reszvenytarsasag. March 20, 1928, [Convention date]. Vibrations, indicating &c. - A device for the distant observation of the oscillations of moving members such as bridges, buildings, machine parts &c. comprises a frame carrying a pendulum weight on two flat spring pivots mounted on the object under observation and a two plate condenser for converting the relative movement between the member and object into electric oscillations in a circuit connected to on oscillograph. As shown applied to a machine bearing Fig. 1 the bearing 1 has secured thereto a frame 2 from which is suspended a pendulum mass 3 by means of strips 4 and steel bands 5<a>, 5<b>, Fig. 2, arranged in one plane. The mass is so chosen that its natural period of oscillation is a multiple of that of the oscillations to be observed. One surface 6 of the mass 3 forms a condenser plate while the second plate 7 is mounted, by means of a ball and socket joint 10 in combination with three set screws 11, on an arm 8 pivoted to the frame 2 preferably in alignment with the bands 5<a>, 5b. A screw 9 is provided to regulate the distance between the plates 6, 7. An oscillograph for use with the apparatus is shown in Fig. 3 and comprises a pot magnet 12 with an adjustable core 13, a diaphragm 14, and a needle 15 connected to a mirror 17 on a spindle 16. The Specification as open to inspection under Sect. 91 (3) (a) states also that a grain microphone, or a piezo-electric crystal may be provided to convert the mechanical vibrations into electric undulations. A device may also be used in which the mechanical oscillations produce, by means of a flexible diaphragm changes of pressure in a gas conducting an electron discharge. This subject-matter does not appear in the Specification as accepted.

Inventors

No inventors recorded.

Bibliographic Details