US333445A

US333445A - Buoyant screw-propeller

Info

Publication number: US333445A
Authority: US
Publication date: 1885-12-29
Anticipated expiration: 1902-12-29

Description

(No Model.)

G. S. BURR. BUOYANT SCREW PROPELLER. No. 333,445. v Patented Dec. 29, 1885.

I 172mm), 1;. W v 9%. (7? [3m ar/ zzy UNITED STATES PATENT OFFICE.

GEORGE S. BURR, OF EVERGREEN, COLORADO, ASSIGNOR OF ONE-HALF TO JAMES BILLINGSLEY, OF BALTIMORE, MARYLAND.

BUOYANT SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 333,445, dated December 29, 1885.

Application filed October 15, 1885. Serial No. 179,921. (No model.)

To all whom it may concern: the screw-propeller will be revolved, and

Be it known that I, GEORGE S. BURR, a thereby the craft will be moved. Any suitcitizen of the United States, residing at Everable contrivance may be employed in the boat green, in the county of Jefferson and State of to impart motion to the shaft L. In the pres- (Jolorado, have invented certain new and useent instance a crank. m, is fixed to the shaft. ful Improvements in Buoyant Screw-Propel- It may be driven by steam or other power. lers, of which the following is a specification. Arudder, N, is rigged at the stern and extends My invention relates to an improvement in down the rear upright end of the false-keel 5 boats, the object being to provide a boat with bar, and a tiller, 0, is fixed to the rudder-post,

IO ascrew-prope1ler,which will also serve to buoy as usual. It will be seen that for a light boat up or sustain the boat. the hollow cylinder may serve to sustain it The invention is illustrated in the accomwhen unloaded, as shown in Fig. 3, entirely panying drawings, in which Figure l is a side above the water. The relative size and weight L view of the improved boat. Fig. 2 is a top of hollow cylinder and boat may be such as,

1 view. Fig. 3 is an end view showing the powhen loaded, to let the boatset lightly on the sition of the boat in the water when unloaded. surface of the water without displacing much Fig. Aisa cross-section of the screw-propeller. water. It is obvious two hollow cylinders The boat A may be of any desired shape or maybe thus provided with spiral flanges, and 6 construction. For the purpose of illustration the two placed side by side and the boat 20 the ordinary shape is here shown. A hollow wholly sustained above them. Properly contight cylinder, B, hasaspi-ral flange, 0, around structed on this plan, a boat may be moved it, which serves as a screw-propeller. The with great rapidity. 1 cylinder being light will float and gives buoy- Instead of a hollow cylinder the cylinder ancy to the boat. The cylinder inayhave any may be made solid, but of some very light 25 desired shape at the ends-rounded, square, buoyant material, like cork, so as to have the or tapering-somewhat cone'shaped, as shown desired buoyant properties. at d 1n Fig. 1. The spiral flange may be se Having described my invention, I claim and cured to the cylinder in any convenient or desiretosecureby LettersPatentof the United approved manner. In the present instance States- 0 one flange continues spirally around it from 1. A boat having a false-keel bar, G, in end to end; but two flanges may be used, if combination with a buoyant cylinder having desired. At each end the cylinder has a joura spiral flange and mounted between the said nal, e, which sets in a bearing, f, on a metal false-keel bar and boat, as set forth. keel-frame, G. This keel-frame G is an iron 2. A boat having in'conibination a body, a

5 bar, whose upright ends h support the boat, false-keel bar depending below the body, a while the lower longitudinal part between the buoyant cylinder provided with a spiral flange said two upright ends is a kind of false keel, and mounted between the body and false-keel P and serves as a ballast to prevent the craft bar, and driving mechanism, substantially as from careening. The screw-propeller O is described, connecting the boat-body with the 0 thus between the lower bar and the boat, and buoyant cylinder, as set forth.

turns in its bearing f. At the stern end the In testimony whereof I affix my signature in journal 6 has a spur-gvheel, t, and) 1a shaltt, L, presence of two witnesses.

asses through the oat, a suita e pac ing, 3 in the boat-bottom being provided to pre- GEORGE BURR' 5 vent leakage, and a spur-wheel, Z, on the shaft Witnesses:

engages with the spur-wheel i on the screw- S. E. MASSON, propeller. By turning the shaft L in the boat D. L. N ESTER.