Geometrical instruments – Gauge – Axle
Patent
1978-03-20
1982-09-07
Stearns, Richard R.
Geometrical instruments
Gauge
Axle
33 1N, G01B 525
Patent
active
043476686
ABSTRACT:
Compact and portable apparatus particularly useful in aligning the axles of trailers comprises an instrument case connected by an elongated spring-loaded cable to the trailer kingpin and connected by a pair of cables to clips releasably fastened at spaced locations to the trailer axle. The case contains a sector gear which is connected to the kingpin cable and which meshes with a pinion gear coupled to a pointer adapted to register with an array of graduations to provide a readout of the misalignment which is readily readable by a workman stationed at the location adjacent the trailer axle adjustment mechanism. If desired, the case may include a lamp which is connected to a self-contained power supply and which is illuminated when the axle is properly aligned with respect to the trailer frame. In one modified embodiment, a potentiometer is coupled to the input lever and is operable to provide an analog signal corresponding to the misalignment of the axle. The analog signal is processed in a circuit carried in the case to provide a readout of the angular disposition of the axle with respect to the trailer frame. In another modified embodiment, the apparatus is designed so that the casing can be mounted by a bracket to pre-drilled holes in the axle and the pointer read from the front of the axle.
REFERENCES:
patent: 2590722 (1952-03-01), Otis
patent: 2640274 (1953-06-01), Crosby
patent: 2845718 (1958-08-01), Keymer
patent: 3137076 (1964-06-01), Hurst
patent: 3248794 (1966-05-01), Corry
patent: 3611575 (1971-10-01), Chartier
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