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Calibratable-dial

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Calibratable dial

Details

Inventors: Howie, Jr., Robert K.;
Assignee: The Grigoleit Company (Decatur, IL)
Primary Examiner: Dorner; Kenneth
Assistant Examiner:
Attorney, Agent or Firm: Kinzer, Plyer, Dorn & McEachran

A calibratable dial for mounting on a control shaft. The dial includes a hub and a skirt frictionally fastened to each other for rotational movement in unison. The hub has a generally cylindrical portion and a disc portion. A shaft receiving socket is formed in the generally cylindrical portion of the hub. A central opening is formed in the skirt and is sized to fit over and receive the generally cylindrical portion of the hub when the skirt and hub are frictionally fastened to each other. An arcuate toothed sector is formed in the skirt along one portion of the central opening thereof at a location overlying the disc portion of the hub. Instrument receiving sockets are formed in the hub in alignment with the central opening in the skirt. The sockets are positioned to extend under the arcuate toothed sector of the central opening of the skirt so that an instrument inserted in either of the sockets will engage the hub and the toothed sector of the skirt. Upon twisting of the instrument, frictional engagement between the hub and skirt will be overcome to rotate the hub and skirt relative to each other through a limited arcuate extent.

DETAILED DESCRIPTION This invention is concerned with a calibratable dial for mounting on a control shaft, particularly a shaft used to select and control temperature.
An object of this invention is a dial which can be calibrated relative to a control shaft.
Another object is a dial for a control shaft which can be incrementally calibrated relative to the control shaft.
Another object is a dial which can be calibrated without disassembly of the dial from its shaft.
Another object is a dial which can be positively calibrated in increments of degrees of temperature.
Other objects may be found in the following specification, claims and drawings.

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