RICH, CHRISTOPHER T.,CRUZ, ROBERT T.,HOLLIDAY, EDWARD J.
申请号：
CA2590529
公开号：
CA2590529C
申请日:
2007.05.30
申请国别(地区):
CA
年份:
2014
代理人:
摘要：
A bird feeder has telescopically aligned inner andouter cylindrical housings with opposed surfaces of complementaryshape that are reverse tapered in a substantially verticaldirection to enable guided vertical movement of the housings withrespect to each other. The housings have openings in their sidewalls which are substantially in alignment when the outer housingis in an upper position and misaligned when the outer housing isin a lower position.A compression spring centrally locatedabout the vertical axis of the feeder is confined within a lowerportion of the feeder and biases the outer housing to its upperposition. When the outer housing is moved to its lower positionby the weight of a squirrel overcoming the biasing force of thecompression spring, the housing openings are substantiallymisaligned such that no significant through opening exists,thereby preventing access to the birdseed.
