| 摘要 |
916,434. Overload slip couplings. KOLLSMAN INSTRUMENTS CORPORATION. April 19, 1960 [April 20, 1959], No. 13710/60. Class 80 (2). [Also in Group XXXVIII] An overload slip coupling, for use in an aeroplane automatic pilot or the like, comprises an input shaft 46, Fig. 5, fast with which is a permanent magnet 72 and a friction washer 74 adjustably mounted upon screw-threads 76, the flanged end of a driven coupling-sleeve 80 rotatably and axially movable upon a spigot 78 fast with the shaft being drawn into engagement with the friction washer by the magnetic flux. A radial arm 82 fast with the driven sleeve 80 lies between two adjustable stop-screws 84, 86, so that rotation of the driven sleeve is limited, continued rotation of the input shaft 46 beyond a predetermined angle merely causing the coupling to slip. In the form shown, the coupling is applied to an altitude control device coupled to the automatic pilot of an aeroplane, pressure-sensitive bellows 58, 60, Fig. 1, connected by cranked arms 50, 52, Fig. 3, to a radial arm 48 fast with the shaft 46, moving with changes in ambient pressure caused by variations in the aeroplane height to rotate the shaft one way or the other. Fast with the driven sleeve 80 of the coupling is an arm 70 forming the I part of an E-I voltage-sensitive device 62 having coils 64, 66, 68 connected to the automatic pilot. Movement of the arm 70 causes changes in the voltage produced by the device 62, these voltage fluctuations being fed to the automatic pilot for adjustment of the aeroplane elevator surfaces. Alternatively, the device 62 may be replaced by a potentiometer system.
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