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US 4,303,147 AGranted
Adjustment for pneumatic timer
AssigneeAllen-Bradley Company, Inc.
InventorsGeorge J. Selas, John S. Hart
Life of this patent
Estimating the term…
Abstract
An adjustment mechanism for a pneumatic timing device, that operates relay contacts with a time delay, in which a needle valve is aligned longitudinally with a bellows and the needle valve is operated by a rotatable adjustment knob that operates a visual indicator through a reduction gearing.
Claims5
In a position indicator for a pneumatic timing device, the combination comprising:
- a rotatable adjustment member having a concentrically disposed drive gear at one end thereof;
- a gear assembly having an axis laterally disposed from the axis of rotation of said adjustment member, with a large intermediate gear engaging said drive gear to be turned thereby and a small pinion gear attached in concentric arrangement to said intermediate gear for rotation therewith;
- a valve with a valve housing and with a valve member that is coupled to said adjustment member, said valve member being adjusted in its position upon rotation of said adjustment member;
- a cover member supported by said valve housing to close over said gear assembly and having an opening through which said adjustment member projects;
- a position indicator rotatable relative to said adjustment member and encircling the same, said position indicator having a raised portion situated in said opening, said raised portion having a reference mark disposed thereon, and said position indicator also having an output gear portion engaging said small pinion gear within said cover member to be driven thereby;
- and
- a stationary timing scale arranged in an arc alongside said opening in the cover member to provide a time delay reading for a selected position of the reference mark on said raised portion of said position indicator.
4 more elements
Dependencies are inferred from the claim text.