Otter board
AssigneeNichimo Co., Ltd.
InventorsHiromi Kinoshita, Tsutomu Fukushima
Life of this patent
Estimating the term…
Abstract
An otter board, the net-mouth expanding force of which can be freely adjusted corresponding to the fishing style. The otter board according to the invention is charactrized in that, said otter board having biplane otter board members, an outer board member (3) is formed by a fixed board member (4) having openings therein and a moving board member or members (6, 6) having a shape closing said openings and located so as to move between said fixed board member (4) and an inner board member (2).
Claims15
A rigid biplanar otter board towable through the sea in a longitudinal direction for transversely diverting and thereby opening the mouth of a net towed substantially longitudinally thereby, said otter board being of variable effective area presented to the sea when towed therethrough, to vary the towed net mouth transverse diverting force produced to open said net mouth, comprising:
- a. a pair of spaced apart, longitudinally elongated vertically upstanding substantially parallel curved boards, one of said boards having transverse apertures therethrough, said boards being curved respecting a vertical axis of the otter board, having substantially common curvature and being of substantially the same size;
- b. a generally planar horizontal step board fixedly connected to said curved boards at common lower extremities thereof and being generally perpendicular thereto;
- c. a plurality of parallel generally planar members extending between said boards of said pair and being generally parallel with and spaced from said step board;
- d. said step board and said planar members collectively providing means for maintaining said boards of said pair in spaced disposition respecting one another;
- e. a plurality of parallel threaded rods connected to and extending between said boards of said spaced apart pair and being generally parallel with said step board and said planar members;
- f. a plurality of vertically spaced intermediate curved boards parallel with and mounted between said boards of said pair on said rods and being freely movable therealong, for selectably covering said apertures in said apertured board of said spaced apart pair;
- g. said intermediate curved boards being vertically separated one from another by at least one of said planar members extending between said boards of said pair;
- h. threaded means movable along said rods for maintaining said intermediate board at a variably selected position along said rods relative to said boards of said pair.
Dependencies are inferred from the claim text.