A stop member (74; 174) is affixed to an elongated rudder blade (16) near its top and projects forward beyond the leading edge of the blade. A frame (62) in which the blade (16) is slidable lengthwise extends along a portion of the trailing edge of the blade and forward along the opposite sides. A s
A stop member (74; 174) is affixed to an elongated rudder blade (16) near its top and projects forward beyond the leading edge of the blade. A frame (62) in which the blade (16) is slidable lengthwise extends along a portion of the trailing edge of the blade and forward along the opposite sides. A separate mounting block (12) has a groove (48) receiving a portion of the leading edge of the blade (16). A pivot component (82) is mounted in the groove (48) for engagement against the underside (78) of the stop (74) when the blade (16) is in a normal upright steering position. A spring (52) is connected between the mounting block (12) and the frame (62) to bias the frame toward a position in which the blade (16) received therein extends in an upright steering position. From such position, the blade (16) can be swung upward and rearward, followed by forward translational movement through the frame (62) and along the mounting member (12).
대표청구항▼
1. A rudder assembly comprising: an elongated rudder blade having leading and trailing edges, opposite side faces, and top and bottom ends;a stop member affixed to the blade near the top end and having a portion projecting forward beyond the leading edge thereof;a frame extending along a portion of
1. A rudder assembly comprising: an elongated rudder blade having leading and trailing edges, opposite side faces, and top and bottom ends;a stop member affixed to the blade near the top end and having a portion projecting forward beyond the leading edge thereof;a frame extending along a portion of the trailing edge of the blade and forward along the opposite side faces of the blade, the frame forming a slot and the blade being slideable lengthwise through the slot in the frame;a mounting block having a groove receiving a portion of the leading edge of the blade opposite the portion of the trailing edge along which the frame extends, the mounting block having a pivot component for engagement against the forward projecting portion of the stop member such that the blade is rotatable from an upright steering position with the stop member engaged against the pivot component toward a horizontal retracted position; anda spring connected between the mounting block and the frame, the spring biasing the frame toward a position in which the blade received in the slot therein extends in the upright steering position but allowing upward rotation of the blade and frame relative to the mounting block followed by lengthwise translation of the blade relative to the frame and mounting block. 2. The rudder assembly of claim 1, in which the pivot component is a roller received in the groove of the mounting block, the stop member having an arcuate cut-out for resting on the roller when the blade is in the upright steering position. 3. The rudder assembly of claim 1, in which the mounting block is adapted for mounting on the stern of a personal watercraft for swinging about an upright axis. 4. The rudder assembly of claim 1, in which the spring constitutes the only mechanical connection between the frame and the mounting block. 5. The rudder assembly of claim 1, in which the blade is not mechanically attached to the frame and is not mechanically attached to the mounting block. 6. The rudder assembly of claim 1, in which the mounting block has an enclosed area with adjustable clamp blocks adapted for connection of a steering control line. 7. The rudder assembly of claim 1, in which the rudder blade and stop member are adapted for connection at different locations along the leading edge of the blade, whereby the depth of the blade below the mounting block can be adjusted by changing the location of attachment of the stop member to the rudder blade. 8. The rudder assembly of claim 1, in which the stop member and mounting block have cooperating components to permit limited swinging of the rudder blade in the direction opposite the direction of retraction. 9. The rudder assembly of claim 8, in which the cooperating components include inclined flanges on the stop member and cooperating inclined projection edges on the mounting block, such flanges and edges being immediately adjacent to each other when the rudder blade is in the upright steering position. 10. The rudder assembly of claim 1, in which the blade tapers in width from its bottom end to its top end, and the frame being biased against the trailing edge of the blade to hold it engaged in the groove of the mounting block, such that lengthwise shifting of the blade in the frame slot results in changing the relative positions of the frame and the mounting block. 11. The rudder assembly of claim 1, in which the spring is a helical torsion spring having a helical body and a first spring arm mounted on the mounting block, the torsion spring having a second spring arm secured to the frame. 12. A rudder assembly comprising: an elongated rudder blade having leading and trailing edges, opposite side faces, and top and bottom ends, the blade being tapered from its bottom end toward its top end such that the distance between the trailing and leading edges decreases;a stop member affixed to the blade near the top end and having a portion projecting forward beyond the leading edge thereof, the rudder blade and stop member being adapted for connection at different locations along the leading edge of the blade, whereby the depth of the blade below the stop member can be adjusted by changing the location of attachment of the stop member to the rudder blade;a frame extending along a portion of the trailing edge of the blade and forward along the opposite side face of the blade, the frame forming a slot and the blade being slideable lengthwise through the slot in the frame;a mounting block adapted for mounting on the stern of a personal watercraft for swinging about an upright axis, the mounting block having a groove receiving a portion of the leading edge of the blade opposite the portion of the trailing edge along which the frame extends, the frame being biased toward the portion of the mounting block groove receiving the leading edge of the blade such that sliding of the tapered blade in the frame slot shifts the position of the frame relative to the block, the mounting block having a pivot component for engagement against the forward projecting portion of the stop member such that the blade is rotatable from an upright steering position with the stop member engaged against the pivot component toward a horizontal retracted position, the pivot component being a roller received in the groove of the mounting block, the stop member having an arcuate cut-out for resting on the roller when the blade is in an upright steering position, the mounting block having an enclosed area with adjustable clamp blocks adapted for connection of a steering control line; anda spring connected between the mounting block and the frame, the spring biasing the frame toward a position in which the blade received therein extends in the upright steering position but allows upward rotation of the blade and frame relative to the mounting block followed by lengthwise translation of the blade relative to the frame and mounting block, the spring being a helical torsion spring constituting the only mechanical connection between the frame and the mounting block and having a helical body and a first spring arm mounted on the mounting block, the torsion spring having a second spring arm secured to the frame, the stop member and mounting block having cooperating components to permit limited swinging of the rudder blade in the direction opposite the direction of retraction, the cooperating components including inclined flanges on the stop member and cooperating inclined projection edges on the mounting block, such flanges and edges being immediately adjacent to each other when the rudder blade is in the upright steering position. 13. The rudder assembly of claim 12, in which the blade is not mechanically attached to the frame and is not mechanically attached to the mounting block.
Czarnowski, James Taylor; Ketterman, Gregory Scott; Kardas, Jason Christopher; Dow, Philip James; Wicks, Graeme Stuart; Brackett, Drew William, Foot operated propulsion system for watercraft.
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