Static structures (e.g. – buildings) – Animal blocking lateral projection – trap – or scarer
Patent
1997-08-07
1999-03-09
Kent, Christopher
Static structures (e.g., buildings)
Animal blocking lateral projection, trap, or scarer
119 523, 119 579, 119 63, A01K 3901
Patent
active
058785370
ABSTRACT:
A squirrel-proof post is composed of a post, supporting a bird feeder or bird house, an annular sleeve, a set of springs, and a means of securing the springs to both the platform supporting the bird feeder or house and to the sleeve. The set of springs will be naturally somewhat elongated due to the weight of the sleeve. When the squirrel climbs up the post and onto the sleeve or else jumps from the ground onto the sleeve, the additional weight will cause the sleeve to begin to slide down the post at a rate approximating free fall. This sudden and rapid acceleration induces the squirrel to immediately jump off the sleeve, returning to the ground unharmed. The reduction in weight acting in opposition to the restoring force of the springs will rapidly result in the return of the sleeve toward its equilibrium position. The rapid rate of return will prohibit other, lighter squirrels from either jumping on the sleeve and being boosted toward the bird feeder or house or from jumping to a position on the pole above the sleeve, thus circumventing its intended deterrence. The oscillatory motion of the sleeve, induced by the squirrel's jumping on and off the sleeve, can persist for several tens of seconds, during which the squirrel(s) will not be inclined to repeat the attempt. Eventually, the squirrel will become discouraged and leave the area. In this fashion the apparatus prevents the squirrel from gaining access to the bird platform.
REFERENCES:
patent: 2891508 (1959-06-01), Bower
patent: 4031856 (1977-06-01), Chester
patent: 5355835 (1994-10-01), Freed
patent: 5720238 (1998-02-01), Drakos
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