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US 6,149,476 AGranted
Automatically adjustable trim system
AssigneeBrunswick Corporation
InventorJohn R. Eilert
Life of this patent
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AssigneeBrunswick Corporation
InventorJohn R. Eilert
Estimating the term…
An automatically adjustable trim system for a marine propulsion system provides automatic trimming of the propeller in response to increased loads on the propeller. A propulsion unit is attached to a boat transom through a tilt mechanism including a transom bracket and a swivel bracket. In a first embodiment, the transom bracket is clamped to a flexible transom which flexes in response to forces exerted on the transom during acceleration. In a second embodiment, the transom bracket is clamped to a transom bracket mounting platform that is generally parallel to and pivotally attached to the transom. A trim angle biasing mechanism is mounted between the transom and the transom bracket mounting platform for automatically adjusting the trim angle. A third embodiment includes a trim angle biasing mechanism incorporated into the transom bracket or swivel bracket. A fourth embodiment includes a spring-loaded pawl assembly between the swivel bracket and transom bracket.
A marine propulsion system for a boat having a transom, comprising a propulsion unit having a propeller for propelling said boat, a transom bracket mounted to said transom, a tilt mechanism including a swivel bracket pivotally attached to said transom bracket at a horizontal pivot axis for tilting said propulsion unit about said horizontal pivot axis to a preselected trim angle, said transom being a flexural member adjusting trim by automatically trimming said propeller inwardly forwardly toward said boat in response to an increased load on said propeller.
Dependencies are inferred from the claim text.