Marine propulsion – Screw propeller – With means effecting or facilitating movement of propulsion...
Patent
1992-08-03
1994-12-20
Avila, Stephen P.
Marine propulsion
Screw propeller
With means effecting or facilitating movement of propulsion...
440 83, B63H 512
Patent
active
053742079
DESCRIPTION:
BRIEF SUMMARY
The subject invention concerns a device in motor-boats or large motor-propelled ships for setting the [propulsions] propulsion means in an arbitrary angular position within the perimeters of an imaginary conical configuration with one end of the propulsion means attached to the apex of the cone.
Various types of devices are known to bring about yawing of a motor-boat or a large motor-propelled ship. The most common arrangement is to use a fixedly orientated propeller and a rudder by means of which it is possible to make the boat yaw towards the port or starboard side.
In the case of boats equipped with outboard motors the entire motor unit including the propeller is made to turn in one direction or the other, thus forcing the boat to yaw towards the port or starboard side.
It is also known to use trim tabs which are provided at the boat stern and which trim tabs may be set in various tilting positions in relation to a horizontal plane in order to bring the boat to assume various tilting positions relatively to its [main] course of travel.
The subject invention provides a device by means of which it has become possible, [without] by direct actuation of the watercraft propulsion means and thus without the aid of any accessory means, to make the boat yaw in the port or starboard direction, or to affect its position of inclination, for instance to ensure that the boat "planes". The characteristic features of this device appear from the appended claims.
The invention will be described in closer detail in the following with reference to the accompanying drawings, wherein
FIG. 1 illustrates one embodiment of the device in a perspective and longitudinal sectional view,
FIGS. 2 and 3 [illustrates] illustrate, in a longitudinal sectional view, the same embodiment as in FIG. 1 but in two different positions of adjustment,
FIG. 4 is a view of the device, partly in section, of a second embodiment,
FIG. 5 illustrates, partly in section, a third embodiment of the device,
FIGS. 6-19 show a number of vector diagrams designed to illustrate various angle positions of the device, and
FIGS. 20 -27 show various embodiments of propulsions mechanisms for boats of prior-art constructions, each equipped respectively with a conventional device and with the device in accordance with the invention as applied to the propulsion unit.
The embodiment of the device in accordance with FIG. 1 includes a shell sleeve 1 which is assumed to be securely anchored to the boat hull. The device comprises a first sleeve 2, arranged for turning movements about an axis a which is coaxial with the output drive shaft 3 from the boat drive unit. The sleeve 2 is formed with a row of teeth 4 extending on the internal face of the sleeve 2 in the transverse direction thereof and engaging with a pinion 5 which is attached to a rotating rod 6 or rotating cable. With the aid of the rotating rod 6 the sleeve 2 may be rotated in either direction about its centre axis a. The sleeve 2 is formed with a portion 7 extending at an angle to the rotational axis a of the sleeve.
The device also comprises a second sleve 8. A shaft 10 for the boat propulsion means, assumed to be propeller, extends through and beyond said sleeve 8 from an articulation joint 9. Outside the sleeve 8, the drive shaft 10 extends in a direction which is at an angle to the rotational axis b of the sleeve 8. A gear rim 11 is formed at the inner marginal portion of the sleeve 8.
The embodiment of the invention disclosed in FIGS. 1-3 also comprises a third sleeve 12. The latter is arranged for turning movements coaxially with the first sleeve 2 and it is also formed with a gear rim 13 at one of its marginal portions, said rim partly engaging the gear rim 11 of the second sleeve 8. Like the first sleeve 2, the third sleeve 12 is formed with an internal row of teeth 14 extending in the transverse direction of the sleeve 12. A pinion 15 in engagement with said row of teeth 14 is attached to a rotating rod 16 or rotating cable. The third sleeve 12 is arranged, when turned in either direction by means of t
REFERENCES:
patent: 3429509 (1969-02-01), Markowski
patent: 3687374 (1972-08-01), Nash
patent: 4037558 (1977-07-01), Nossiter
patent: 4565532 (1986-01-01), Conner
patent: 4728308 (1988-03-01), Weismann
Avila Stephen P.
Motala Verkstad AB
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