Patent · US Expired

In-trimming hydraulic circuit

US5030147A · kind A · utility

4Cited by
6References
12Claims
0Family size

Assignee

Inventors

Key dates

Filing dateFeb 6, 1990
Grant dateJul 9, 1991
Priority date—
Expiry dateFeb 6, 2010

Classification

  • Technology area (CPC B)Performing Operations; Transporting
  • CPC primaryB63H20/10
  • WIPO fieldTransport
  • WIPO sectorMechanical engineering

Abstract

Disclosed herein is a hydraulic circuit for a marine propulsion device, which circuit comprises a sump for hydraulic fluid, a reversible hydraulic pump, a first fluid conduit communicating between the sump and the pump and including a one way check valve permitting flow to the pump from the sump and preventing flow to the sump from the pump, a second fluid conduit communicating between the sump and the pump and including a one way check valve permitting flow to the pump from the sump and preventing flow to the sump from the pump, and a mechanism for opening one of the check valves in response to closure of the other of the check valves.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.