US1708489A

US1708489A - Propeller for motor boats

Info

Publication number: US1708489A
Application number: US94836A
Authority: US
Inventors: Tolston Elbert Monroe
Original assignee: Individual
Current assignee: Individual
Priority date: 1926-03-15
Filing date: 1926-03-15
Publication date: 1929-04-09
Anticipated expiration: 1946-04-09

Description

April 9, 1929. TOLSTQN 1,708,489

PROPELLER FOR MOTOR BOATS Filed March 15. 1926 gwwntoz,

Z/ZYaZrZa Patented Apr. 9, 1929.

ELBERT MONROE 'IOLSTON, OF MACON, GEORGIA.

PROPELLER non MOTOR BOATS.

Application filed March 15, 1926.

This invention relates to a propeller for motor boats.

It is aimed to provide a novel, simple and inexpensive construction and particularly one having blades operable on one stroke and inactive on the other stroke and adapted for operation through reciprocating mechanism.

The more specific objects and advantages will become apparent from a consideration of the description following taken in conneetion with the accompanying drawings illustrating one embodiment.

In said drawings Figure 1 is a view illustrating the invention in side elevation and in connection with a boat, the latter being fragmentarily illustrated;

Figure 2 is a plan view of the parts of Figure 1;

Figure 3 is a detail sectional view taken on line 33 of Figure 2; and,

Figure at is a detail plan View showing the blades retracted in full lines and the blades in the position they assume while on their inoperative stroke. .i

Referring specifically to the drawing, 10 designates a conventional boat or vessel adapted to carry a suit-able prime mover such as an oil or gasoline engine or a steam engine, (not necessary to illustrate), and which drives a shaft 11 shown as mounted in a bearing- 12 within the boat. Shaft 11 has a bevel gear wheel 13 keyed thereto which meshes with a bevel gear wheel 14 rigid with a drive wheel 15 of a larger diameter than the same as by means of a stub shaft 14 journalled in a bearing plate 14 fastened to the rails or sides of the boat as at 14 or otherwise. Connected to the wheel 15 by a wrist pin 16 is a pitinan 17 which is pivoted at 13 to a reciprocatory bar 19 slidably guided through a hearing or waterproof stuffing box 20 fastenedat the stern of the vessel or boat 10.

Bar '19 extends outwardly of the boat beyond the stern and at its rear end is vertically enlarged into a block 21. On the block 21, through the medium o.L overlapping Serial No. 94,836.

cars 22 and a fastening 24 are two curved propeller blades 23. The ears pivot on fastening 24: and the same located closer to one end of the blades 23 than the other end, thus having relatively large main 'iortions 25 and relatively short abutment portions 26, the portions 26 being adapted for abutment against bar 19 in the open position of the blades as shown in dotted lines in Figure In operation, as shaft 11 rotates, gear wheels 13 and let drive wheel 15, and thus reciprocate pitman 17 and bar 19. As the lades 23 move with the bar 19 toward the stern of the boat, they are in the position shown in full lines in Figures 3 and a, due to the impingement of the water against the outer surfaces of the portion 25, thus form ing, as shown in said figures, a relatively thin body offering minimum resistance to the water. Vfhen the bar 19 moves the blades 23 away from the stern of the boat, the main or inner surfaces of portions 25 impinge against the water, thus engaging the same to the maximum extent as suggested by the dotted lines of F ignre 4:, accordingly offerin resistance to the blades so that the effect thereof is imparted to the boat to propel the same, The opening of the blades 23 to the propelling position is limited by the engagement of the portions 26 with the bar 19 in dotted lines in Figure 4.

Various changes may be resorted to provided they fall within the spirit and scope of'the invention.

I claim:

A propelling mechanism comprising a reciprocatory bar, co-actin propeller blades, said blades being on substantially the same curve throughout their length and having their convex surfaces facing each other, means pivoting said blades closer to their inner ends than to their outer ends and to said bar, the said blades being adapted to contact at their convex surfaces with the bar intermediate their pivot and the inner ends of the bars.

In testimony whereof I atlix my signature.

ELBERT MONROE TOLSTON.