Thermostatic animal feeder

Abstract

A rotary animal feeder that slowly, periodically discharges feed in response to temperature changes. Preferably the feeder is hung from a tree over an animal trail. A cylindrical pail stores a quantity of feed to be dispensed. Feed is drawn downwardly by gravity to an activator assembly comprising a discharge tube in fluid flow communication with the pail interior. A plurality of radially spaced apart discharge orifices are formed in the tube. A convex floor adjustably, coaxially secured within the tube mounts a rotary impeller proximate the discharge orifices. A bimetallic spring beneath the floor torsionally drives the impeller in response to temperature changes. Feed contacting the convex floor is slowly deflected outwardly towards the discharge orifices both by the shape of the convex floor plate and impeller contact. As the temperature changes the impeller slowly rotates, and feed is gently urged toward and through these orifices. Rotary impeller motion maintains efficiency, reduces noise, and minimizes jamming. The feeder is adjustable to vary the feed output rate. An external restrictor band that circumferentially, coaxially attaches to the discharge tube can be positioned to block the discharge orifices. Alternatively, it can be moved to partially blocked or completely unblocked positions. The impeller and the convex floor can be moved vertically upwardly or downwardly within the discharge tube toward or away from the discharge orifices. Daily temperature changes that rotate the impeller operate the feeder without electricity.