A - Human Necessities – 01 – K
Patent
A - Human Necessities
01
K
A01K 73/02 (2006.01) A01K 75/04 (2006.01)
Patent
CA 2047205
ABSTRACT OF THE DISCLOSURE In order to hold trawl bags open during trawling use is made of buoyancy bodies connected with the top edge of the trawl mouthing. When working on large sea depths the air filled buoyancy bodies are exposed to excessive pressures which they can hardly resist when they are made as hollow bodies. The are better off if made of a cellular plastic with small cells, but since they are shaped as balls of a considerable size it is almost impossible to control such a production so as to end up with a production without large cavities. According to the invention the buoyancy body is an assembly of smaller parts formed in a manner such that they have no large thickness anywhere, and when these parts are produced individually as foam plastic parts it is possible to achieve the desired small cell structure thereof. With the illustrated design it is possible to provide a solid foam plastic ball from only two parts, without these parts at any place having a material thickness that is more than just a fraction of the ball diameter.
Marks & Clerk
Nielsen Ove H.
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