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US 4,944,705 AGranted
Tilt damper
AssigneeKayaba Kogyo Kabushiki Kaisha
InventorsMitsuhiro Kashima, Nobumichi Hanawa
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AssigneeKayaba Kogyo Kabushiki Kaisha
InventorsMitsuhiro Kashima, Nobumichi Hanawa
Estimating the term…
The invention consists of a novel tilt damper equipped with two oil chambers; one in the piston-rod extended position and the other in the piston-rod retracted position, which are respectively connected to a gas chamber through an oil passage where a relief valve and a check valve are provided. These valves are alternatively disengaged from the closed condition by an external operator. When these valves are open, oil flows freely into and out of them to allow gas pressure to drive the piston rod in the direction of extension. When only the check valve on the piston-rod oil chamber in the extended position is open, the tilt damper does not move in the direction of retraction. When overload is applied in the direction of extension of the piston rod, the tilt damper extends by applying a negative pressure to the oil chamber on the retraction part. When the overload is removed, the tilt damper automatically returns to the original position. When both valves are closed, the piston is locked by oil pressure to prevent the piston rod from moving in either directions.
A tilt damper for a propelling device attached to a boat comprising a cylinder means containing a supply of oil, a piston means dividing said cylinder means into a first oil chamber and a second oil chamber and movable in said cylinder means to extend and retract relative to said cylinder means, a gas chamber means containing a pressurized gas, first valve means operable to provide communication between said gas chamber means and said first oil chamber, second valve means operable to provide communication between said first and second oil chamber means, and an operating member movable between a plurality of operable positions for opening said first and second valve means, one of said operable positions being a first operable position which opens said first valve means to provide communication between said gas chamber means and said first oil chamber while said second valve means is closed such that said pressurized gas provides cushioning of said first oil chamber and thereby cushioning of extension of said piston means while precluding retraction of said piston means, another of said operable positions being a second operable position which opens both said first and second valve means to provide communication between said first and second oil chambers and between said gas chamber means and said first and second oil chambers such that the pressurized gas extends said piston means, said operating member having a third operable position in which both said first and second valve means are closed to thereby preclude extension and retraction of said piston means.
A tilt damper for a propelling device attached to a boat comprising a cylinder means containing a supply of oil, a piston means dividing said cylinder means into a first oil chamber and a second oil chamber and movable in said cylinder means to extend and retract relative to said cylinder means, a gas chamber means containing a pressurized gas, first valve means operable to provide communication between said gas chamber means and said first oil chamber, second valve means operable to provide communication between said first and second oil chamber means, and an operating member movable between a plurality of operable positions for opening said first and second valve means, one of said operable positions being a first operable position which opens said first valve means to provide communication between said gas chamber means and said first oil chamber while said second valve means is closed such that said pressurized gas provides cushioning of said first oil chamber and thereby cushioning of extension of said piston means while precluding retraction of said piston means, another of said operable positions being a second operable position which opens both said first and second valve means to provide communication between said first and second oil chambers and between said gas chamber means and said first and second oil chambers such that the pressurized gas extends said piston means, said operating member being operated by the boat operator to move said operating member to said other operable position to thereby effect extension of said piston means until a desired extended position of said piston means is reached, said operating member being operated by said boat operator to move said operating member from said other operable position to said one operable position to discontinue further extension of said piston means when said desired extended position has been reached, whereby said boat operator can thereby attain said desired extended positions by operating said operating member.
A tilt damper for a propelling device attached to a boat comprising a cylinder means containing a supply of oil, a piston means movable in said cylinder means and dividing said cylinder means into a first oil chamber and a second oil chamber, said piston means having a piston rod which extends and retracts as said piston means moves in said cylinder means, a gas chamber means containing a pressurized gas, first valve means operable between a closed and open position, said first valve means when in its open position providing communication between said gas chamber means and said first oil chamber, second valve means operable between open and closed positions, said second valve means when in its open position providing communication between said first and second oil chamber means, and an operating member movable between a plurality of operable positions for opening said first and second valve means, one of said operable positions being a first operable position which opens said first valve means to provide communication between said gas chamber means and said first oil chamber while said second valve means is closed such that said pressurized gas provides cushioning of said first oil chamber and thereby cushioning of extension of said piston means while precluding retraction of said piston means, another of said operable positions being a second operable position which opens both said first and second valve means to provide communication between said first and second oil chambers and between said gas chamber means and said first and second oil chambers such that the pressurized gas extends said piston means, said operating member having a third operable position in which both said first and second valve means are closed to thereby preclude extension and retraction of said piston means.
Dependencies are inferred from the claim text.