US471274A - Screw-propulsion of vessels - Google Patents

Description

(No Model.)

B. J. PAHTZ.

SCREW. PROPULSION 0P VESSBLS; No. 471,274. Patented Mar. 22, 1892.

Fifi-1-.

rates SCREW-PROPULSION OF VESSELS.

SPECIFICATION forming part of Letters Patent No. 471,274, dated March 22, 1892.

Application filed June 27, 1891. Serial No. 397,720. (No model.)

To aZZ whom it may concern.-

Be it known that I, ERNST J. PAHTZ, acitizen of the United States of America, and a resident of the city of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Screw-Propulsion of Vessels, &c., of which the following is a ful1,clear, and exact description.

This invention in the propulsion of vessels consists, in substance, of the combination,with

a fixed horizontal and longitudinal passage.

open at its opposite end portions for water to flow therethrough and located on the hull below the water-line of the vessel, and a propeller-screw placed and adapted by its shaft and connections thereof, as well known, or otherwise suitable to rotate in said water-way, so as to force water through it and out at its rear and discharge end, of a nozzle at said dischargingend and in continuation of said water-way, and means connected to said propeller-shaft and adapted to move said nozzle independently of and relative to the axis of rotation of said screw, all substantially as hereinafter described.

In the drawings forming part of this specification, Figure 1 is a side elevation of the stern of avessel, and showing, in central 1ongitudinal section, one form, and Figs. 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 are views of other forms, of construction and arrangement of this invention, all as hereinafter fully appears.

In the drawings, A represents the stern of a hull B of a vessel, having a keel O and rudder D, all as well known and needing no more particular mention.

E is a fixed horizontal and longitudinal water-way located below the water-line of the vessel just forward of the rudder D and at its opposite end portions open for the passage of water therethrough.

F is a propeller-screw supported by its shaft F within and axially coincident with the water-way E, and all so as to be freely rotated by suitable mechanism (not shown) for driving said shaft, as well known or otherwise suitably. By the rotation of the screw F the water is forced through and driven out of the rear and discharging end E of said water-way, thereby propelling the vessel forward, the propulsion of the vessel backward being secured by reversing the turn of the screw, in which the forward end of said water-way becomes its discharge.

To increase the power exerted by the rotation of the screw in propelling the vessel forward, the rear and discharging end E? of the water-wayE has a nozzle G. (Shown of various forms and arrangements in the drawings.) This nozzle G in all cases is in continuation of the water-way E at its rear or discharging end, and it is arranged to be moved thereon, thereby working in and on the water surrounding it and imparting motion to the water forced through and out of it by the action of the screw, and, as has been described, the power and force of propulsion of the vessel through the water are increased to a most efficient and marked extent.

In Fig. 1 the nozzle G is a round tube inclined axially to the axis of the screw and wator-passage surrounding it, and itisheld on the screw-shaft F and thereby rotated around said axis, passing through the water in an annular path, the inner and outer diameters of which correspond to the diametrically-opposite points of the tube. In Figs. 2 and 3 the axial lines of the rotating nozzle and the screw are coincident and the nozzle at its discharging end is flattened. In Figs. 4. and 5 the nozzle is tubular, and it is adapted by a cam a, secured to the nozzle and at a bearing on the face of a crank-arm h of the screw-shaft F to be horizontally moved laterally across the discharging end of the water-way. Figs. 6, 7, 8, 9, and 10 severally represent in all three distinct forms for the discharging end of a nozzle G and all obvious from the drawings and' in which each form is shown in end and side views.

Using the combination of a screw-propeller in action within a water-way of the vessel and a moving nozzle in continuation of said water-way through which water is discharged by the screw, all as has been explained, with air under pressure forced either into and through the nozzle or into the water just in front of the discharging end of the nozzle, the

water discharged by the nozzle is spread about:

and so made to act on a greater surface of the water through which the vessel is moving and against which said Water is discharged, and

so are obtained increased resistance from the IOO and said shaft, and adapted by the rotation of said shaft to move said nozzle relatively to said water-Way, substantially as described, I 5 for the purposes specified.

In testimony whereof I have hereunto set my hand in the presence of tWo subscribing witnesses.

ERNST J. PAI'ITZ.

'Witnesses:

ALBERT W. BROWN, MARION E. BROWN.

Images