SURVEYING TRAWL Russian patent published in 2009 - IPC B63C7/26 G01C13/00 

FIELD: surveying equipment.

SUBSTANCE: invention relates to equipment designed to analyse water basin bottom and to reveal bottom obstacles, namely to rigid trawls. Surveying trawl comprises sweeping element representing horizontal beam jointed, via rigid spars, graduated poles, with floating vessel. Upper ends of aforesaid graduated poles can move into circular guide elements. The latter are pivoted to horizontal axle of swinging and have stops arranged on their side surface. Aforesaid upper ends of graduated poles are furnished with clamps arranged above the circular guide elements. Balanced retainers are pivoted to the said clamps. One end of the latter has hooks to engage/disengage aforesaid stops. Opposite end of the said balanced retainers has counterbalances. Anchor ropes connect sweeping element with friction hoist mounted on aforesaid floating vessel.

EFFECT: faster detection of underwater obstacles, higher accuracy of their location.

2 cl, 4 dwg