Animal feeder for flowable materials

In a pet feeder of flowable materials, a horizontally disposed serving container (11) provided with a bottom (9), front and rear walls (11b, 11c) and a pair of substantially vertical oppositely disposed sidewalls (11a, 11a), the upper margins of said walls defining an opening (12) in the upper end of the container, and an inverted supply container (14) provided with front and rear walls (14b, 14c) and a pair of substantially vertical oppositely disposed sidewalls (14a, 14a) relatively shorter than the sidewalls of said first opening, the lower margins of the inverted container defining an opening (15) in its lower end, said oppositely disposed sidewall margins of the inverted container being vertically overlapped respectively by and in laterally spaced relation to said oppositely disposed segments of the serving container sidewall margins to thereby provide a passageway between the container ends, in combination with a pair of tongue-and-groove joints (18, 18) respectively connecting said oppositely disposed sidewall margins of the inverted container (14) to said overlapping sidewall segments of the serving container (11), said joints slidably supporting the inverted container upon the serving container and for movement along a path extending forwardly and rearwardly of the feeder, the tongue component (22) of each of said joints (18, 18) being integral with and projecting laterally from one of said connected overlapping sidewall margins and the associated groove component (20) being integral with the other of said connected overlapping sidewall margins and laterally intermeshing with said tongue component (22), each of said joints (18, 18) converging rearwardly and laterally inwardly at an acute angle a relative to said path to cause its tongue and groove components to unmesh longitudinally and laterally, progressively in response to forward movement of the supply container, and conversely, to cause the components to intermesh longitudinally and laterally, progressively in response to rearward movement of the supply container.