FR2783800A1 - Manual propulsion blade for boat comprises pivoting lever that carries mobile fin that can move between positional stops. - Google Patents

Abstract

The manual propulsion blade is made up of a lever (1) with a hole (2) formed in it through which an axle (3) passes. Two positional stops (5) are provided together with a mobile fin (6) that is activated by the user. The lever is displaced in the horizontal direction from the right to the left, and vice versa. The positional stop sets the fin at a precise angle. The fin, under the operation of the user, comes in contact with the positional stop to attain the same set angle as the positional stop.

Description

DESCRIPTION 2783800

  --l- The present invention relates to a device for advancing

a boat.

  Positioned vertically at the rear of a boat, it is enough to move a lever from right to left so that a fin moves into the swimming position between two stops and this, without any possible twisting.

  The result obtained is independent of the will of its user.

  Advancing a boat in the traditional way requires a minimum of learning and you have to use both hands. lo The device according to the invention makes it possible to remedy this loss of time especially in the event of panic. For example, during a shipwreck, it would suffice that the shipwrecked move the lever from right to left

  one hand is enough to move the lifeboat forward.

  The accompanying drawings illustrate the invention.

  Figure I shows the device of the invention seen from above.

  Figure 2 shows a section of this device.

  With reference to these drawings, the device comprises a lever (1)

  the length of which may vary depending on the size of the boat.

  In its middle (variable) is a vertical hole (2) through which passes an axis (3) which is fixed to it to the boat, with an integral part (4) bolted to the lever in order to be able to increase or decrease the angle d tilt of the fin. On each side of this part number 4 are fixed two stops whose ends are cut at 45 degrees (variable). A movable fin (6) which pivots on articulations

fixed on the part (4).

  In its horizontal position, the principle is the same. Fixed as low as possible at the rear of a sea boat, it is the swell which, by raising and lowering the boat, activates the aileron without

human hand contest.

  In both cases, horizontal or vertical position, the fin will feather as soon as the driving agents (human hand or

  the action of the swell) have ceased to act.

  In its vertical position, as soon as the lever is actuated, this aileron folds to the right as to the left at an angle identical to the cut of the stop and swims by making a Z in the water, always the

same side forward.

  In this position the fin develops maximum thrust force in the water for two reasons: = Inclination of the part (4)

  - Inclination of the fin (6) caused by the stop.

-2-

Claims (4)

  1) Device for advancing a boat, characterized in that it comprises a lever (1) having an orifice (2) through which passes an axis (3) of two stops (5) and a movable fin (6) who puts himself in   position under the action of its user.   2) Device according to claim 1, characterized in that the   lever moves horizontally from right to left and vice versa.   3) Device according to claim 1, characterized in that the stop (5), which has a precise cut, gives the fin an identical angle. 4) Device according to claim 1, characterized in that the fin (6), under the action of its user, comes into contact with the stop (5), therefore, it has the same inclination as the angle of   cut the stopper, one way and the other.