Abstract: A tamper resistant animal guard for a drain pipe outlet having self cleaning prongs for preventing the admission of small animals while allowing sticks, leaves and other debris to flow from a drain pipe is provided by the utilization of a plurality of individually rotatable prongs axially disposed on an axle or shaft. A mounting bracket for mounting the axle or shaft is preferably of a flexible material to conform to the inside circumference of the drain pipe while engaging the ends of the axle or shaft which extends substantially across the diameter of the drain pipe.

Abstract: Apparatus for collecting debris floating in a stream comprises collector means disposed astride the stream with a first part arranged to engage and intercept floating debris and with another part pivotally mounted downstream and above the surface of the stream, and lift means secured to the collector means adjacent the first part for controlling the elevation of the first part in accordance with variations in the level of the stream.