Marine door movement control apparatus
OwnerChristopher B. Jacksoninventor
Life of this patent
Estimating the term…
Abstract
Door control apparatus is provided for a sliding door for use with a boat or a ship. The door control apparatus is unbiased in either direction and will substantially maintain any position in which it is placed, except during extreme rolling or pitching of the boat or ship due to heavy weather conditions. The door control apparatus provides for equal but opposite force to open the door as to close the door. The door control apparatus includes piston and cylinder means with fixed orifices. Other than the piston its associated parts, there are no moving parts to the mechanism.
Claims11
Control apparatus adapted for use with a sliding door, comprising
- a hollow cylinder,
- a cylindrically shaped piston, having a piston rod attached to one side thereof, slidingly located within said cylinder and proportioned for sliding axial movement relative thereto,
- air contained within said cylinder and present on both sides of said piston therein, and
- means for allowing an equal but opposite force to move said piston in either axial direction within said cylinder comprising:
- a pair of axially spaced seals located on a circumference of said piston, and bounding a flow space therebetween,
- a first orifice axially through said piston whereby air flow therethrough communicates with each of two side ends of said piston,
- a second orifice radially through said piston whereby air flow therethrough communicates with one of said side ends of said piston and with said flow space between said seals,
- one of said seals having a flexible outer surface whereby air flow through said second orifice into said flow space between the seals, unseals said flexible outer surface and allows air flow from said flow space to the other side end of said piston.
Control apparatus for controlling the movement of a sliding door comprising:
- a hollow cylinder;
- a piston having a rod attached to one side thereof, said piston located within said cylinder and for axial movement relative thereto;
- means for allowing equal but oppositely directed forces to move said piston in either axial direction relative to said cylinder, said means comprising:
- a first orifice longitudinally through said piston for flow communicating a first end of said piston with a second end thereof;
- a second orifice for flow communicating with said first end of said piston;
- and
- means for communicating said second orifice with said second end of said piston in accordance with axial relative movement of said piston in one direction only,
- said means for flow communicating said second orifice with said second end of said piston comprising a pair of axially spaced seals around said piston forming a space between said seals, said space being further bounded by an inner diameter of said cylinder and an outer diameter of said piston, said second orifice flow communicating said first end of said piston with said space, one of said seals having a flexible outer surface whereby flow through said second orifice into said space causes bypass flow past said flexible outer surface to the second end of said piston.
Dependencies are inferred from the claim text.