Outboard marine propulsion unit

Claim 2

Outboard marine propulsion unit comprising clamp bracket means adapted to be secured to a boat hull, swivel bracket means pivotably mounted about an axis on said clamp means, and carrying a propulsion unit, tilt lock means for holding said swivel bracket means in a position raised with respect to a normal operating position, said tilt lock means including locking member means pivotably mounted on one of the clamp bracket means and the swivel bracket means and having elongated slot means, said slot means being formed at one end with locking recess means offset to one side of the slot means, locking pin means provided on the other of said clamp bracket means and said swivel bracket means and slidably engaging said slot means, biasing means for engaging said locking member means at a point for applying thereto a biasing force in such a direction that the locking recess means is forced into engagement with the locking pin means when the swivel bracket means is moved to the raised position and the locking pin means is slidably moved along the slot means to the end where the locking recess means is formed, restricting means adapted to engage said locking member means for applying thereto a biasing force which is larger than but opposite to the biasing force of the biasing means for restricting said locking member means against the movement under the biasing means, and control means for moving said restricting means into and from a position where the restricting means is engageable with said locking member means, said biasing means being independent from said restricting means and said control means so that said biasing means can always apply a biasing force to said locking member.

Claim 3

The propulsion unit in accordance with claim 1 in which said restricting means includes a control lever rotatably mounted on said swivel bracket means and a stop pin provided on said lever for engagement with said locking member means.

Claim 4

The propulsion unit in accordance with claim 2 in which said control means includes an operating lever pivotably mounted about an axis coaxial with the pivot axis of the swivel bracket, said operating lever being connected with the control lever so that the latter lever can be rotated by the former lever.

Claim 5

The propulsion unit in accordance with claim 1 in which said biasing means includes a torsion spring which engages the locking member means when the swivel bracket means has raised by a predetermined distance.

Claim 6

The propulsion unit in accordance with claim 1 which further includes reverse lock means for holding the swivel bracket means in the normal operating position.

Claim 7

The propulsion unit in accordance with claim 5 in which said control means is interconnected with the reverse lock means in such a manner that, when the restricting means is moved into the position where it is engageable with said locking member means, said reverse lock means is moved to lock position.

Claim 8

The propulsion unit in accordance with claim 5 in which the reverse lock means is so formed that it is overridden by a reverse thrust beyond a predetermined value.

Claim 9

The propulsion unit in accordance with claim 1 in which said restricting means being so located that it engages said locking member means at a position more distant from the axis of pivot movement of the locking member than the point where the biasing means engages the locking member means.

Claim 10

Outboard marine propulsion unit comprising clamp bracket means adapted to be secured to a boat hull, swivel bracket means pivotably mounted about an axis on said clamp bracket means, and carrying a propulsion unit, tilt lock means for holding said swivel bracket means in a position raised with respect to a normal operating position, said tilt lock means including locking member means pivotably mounted on one of the clamp bracket means and the swivel bracket means and having elongated slot means, said slot means being formed at one end with locking recess means offset to one side of the slot means, locking pin means provided on the other of said clamp bracket means and said swivel bracket means and slidably engaging said slot means, means for biasing locking member means in such a direction that the locking recess means is forced into engagement with the locking pin means when the swivel bracket means is moved to the raised position and the locking pin means is slidably moved along the slot means to the end where the locking recess means is formed, restricting means including a control lever rotatably mounted on said swivel bracket means and a stop pin provided on said lever for engagement with said locking member means for restricting said locking member means against the movement under the biasing means, and control means for moving said restricting means into and from a position where the restricting means is engageable with said locking member means, said control means including an operating lever pivotably mounted about an axis coaxial with the pivot axis of the swivel bracket, said operating lever being connected with the control lever so that the latter lever can be rotated by the former lever.

Claim 11

Outboard marine propulsion unit comprising clamp bracket means adapted to be secured to a boat hull, swivel bracket means pivotably mounted about an axis on said clamp bracket means, and carrying a propulsion unit, tilt lock means for holding said swivel bracket means in a position raised with respect to a normal operating position, said tilt lock means including locking member means pivotably mounted on one of the clamp bracket means and the swivel bracket means and having elongated slot means, said slot means being formed at one end with locking recess means offset to one side of the slot means, locking pin means provided on the other of said clamp bracket means and said swivel bracket means and slidably engaging said slot means, means for biasing locking member means in such a direction that the locking recess means is forced into engagement with the locking pin means when the swivel bracket means is moved to the raised position and the locking pin means is slidably moved along the slot means to the end where the locking recess means is formed, restricting means including a control lever rotatably mounted on said swivel bracket means and a stop pin provided on said lever for engagement with said locking member means for restricting said locking member means against the movement under the biasing means, and control means for moving said restricting means into and from a position where the restricting means is engageable with said locking member means, said control means including an operating lever pivotably mounted about an axis coaxial with the pivot axis of the swivel bracket, said operating lever being connected with the control lever so that the latter lever can be rotated by the former lever.

Claim 12

Outboard marine propulsion unit comprising clamp bracket means adapted to be secured to a boat hull, swivel bracket means pivotably mounted about an axis on said clamp bracket means, and carrying a propulsion unit, tilt lock means for holding said swivel bracket means in a position raised with respect to a normal operating position, said tilt lock means including locking member means pivotably mounted on one of the clamp bracket means and the swivel bracket means and having elongated slot means, said slot means being formed at one end with locking recess means offset to one side of the slot means, locking pin means provided on the other of said clamp bracket means and said swivel bracket means and slidably engaging said slot means, means for biasing locking member means in such a direction that the locking recess means is forced into engagement with the locking pin means when the swivel bracket means is moved to the raised position and the locking pin means is slidably moved along the slot means to the end where the locking recess means is formed, said biasing means including a torsion spring which engages the locking member means when the swivel bracket means has raised by a predetermined distance, restricting means adapted to engage said locking member means for restricting said locking member means against the movement under the biasing means, and control means for moving said restricting means into and from a position where the restricting means is engageable with said locking member means.

Claim 13

Outboard marine propulsion unit comprising clamp bracket means adapted to be secured to a boat hull, swivel bracket means pivotably mounted about an axis on said clamp bracket means, and carrying a propulsion unit, tilt lock means for holding said swivel bracket means in a position raised with respect to a normal operating position, said tilt lock means including locking member means pivotably mounted on one of the clamp bracket means and the swivel bracket means and having elongated slot means, said slot means being formed at one end with locking recess means offset to one side of the slot means, locking pin means provided on the other of said clamp bracket means and said swivel bracket means and slidably engaging said slot means, means for biasing locking member means in such a direction that the locking recess means is forced into engagement with the locking pin means when the swivel bracket means is moved to the raised position and the locking pin means is slidably moved along the slot means to the end where the locking recess means is formed, said biasing means including a torsion spring which engages the locking member means when the swivel bracket means has raised by a predetermined distance, restricting means adapted to engage said locking member means for restricting said locking member means against the movement under the biasing means, and control means for moving said restricting means into and from a position where the restricting means is engageable with said locking member means.