Signals and indicators – Indicators – Operator movable
Patent
1981-10-13
1984-05-08
Frankfort, Charles
Signals and indicators
Indicators
Operator movable
116311, G05G 110
Patent
active
044468113
ABSTRACT:
A knob and skirt assembly for mounting on the end of a control shaft which assembly has a dial which can be calibrated relative to the control shaft. The assembly includes a knob having a handle and a hub. The disc shaped skirt has a central opening adapted to receive the hub and to engage a stop to position the skirt relative to the hub. In one embodiment, tabs are formed on the hub and bent against the skirt to secure the skirt against the stop and to frictionally resist rotation of the hub and skirt relative to each other until a predetermined rotational force is applied to overcome this frictional resistance. In another embodiment, a spring washer is utilized for this purpose. A first set of indicia is applied to the skirt on the handle side thereof along the circumferential periphery of the skirt. A second set of indicia is applied to the skirt on the hub side thereof along the circumferential periphery thereof. In one embodiment, a pointer is formed on the hub and bent against the skirt to align with the second set of indicia. In another embodiment, a pointer is formed on the handle and extends through an arcuate opening formed in the skirt adjacent the second set of indicia. An inwardly projecting tab is formed on the skirt and engages the hub to limit rotational movement of the skirt relative to the hub when the frictional resistance between the skirt and hub is overcome.
REFERENCES:
patent: 2607533 (1952-08-01), Main
patent: 2794412 (1957-06-01), Rauth
patent: 2995105 (1961-08-01), Maltby
patent: 3109412 (1963-11-01), Fuhrman et al.
patent: 3154051 (1964-10-01), Durst et al.
patent: 3916721 (1975-11-01), Egger
patent: 4012806 (1977-03-01), Howie, Jr.
patent: 4213416 (1980-06-01), Klinger
Frankfort Charles
Schuster David R.
The Grigoleit Company
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