US803560A - Reversing propeller. - Google Patents

Description

No. 803,560. v PATBNTEDNOV. 7, 1905.

' E. B. & L. S. CUSHMAN.

.REVERSING PROPELLER.

APPLIGATION FILED JUNE 24.1905.

2 SHEETS-SHEET 2.

Witnesses v g lnven'tors. g W by Attorneys UNITED STATES 'PArnNT ornion.

EVERETT B. GUSHMAN AND LESLIE S. CUSHMAN, OF LINCOLN, NEBRASKA.

REVERSING FFKOPELLER.4

Specification of Letters Patent.i

Patented Nov. 7, 1905.

Application filed June 24, 1905. Serial No. 266,840.

To all tf1/tom, it may concern.-

Be it known that we, EvnRn'rT B. CUsHMAN and LESLIE S. CUsHuAN, citizens of the United States, residing at Lincoln, in the county of Lancaster and State of Nebraska, have invented a new and useful Reversing Propeller, of which the following is a specification.

This invention relates to screw-propellers, and has for itsprincipal object to provide a novel form of propeller whichmay be readily reversed or the position of the blades adjusted in order to alter the direction of travel of the boat or to increase or decrease the speed.

A further object of the invention is to provide mechanism of simple and compact construction and so arranged as to prevent choking of the parts by grass or seaweed.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is asectional elevation of a reversible screw-propeller constructed in accordance with the invention. Fig. 2 is a detail sectional view of the sectional casing for adjusting the positions of the propeller-blades. Fig. 3 is a transverse sectional view of the device on the line 3 3 of Fig. 1 drawn to an enlarged scale. Fig. 4 is a view showing the propeller adjusted for driving the boat ahead. Fig. 5 shows the propeller adjusted for driving the boa't astern.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

The main shaft 10 is led out through the stern of the boat and is provided at its rear end with a head-block 11, that is rigidly secured to the shaft. This block is bifurcated, forming a pair of ears 12, that are provided with openings for the passage of stems 13 and 14, that are formed integral with propellerblades 15, and these stems interfit, the stem 13 having a reduced portion 15, that extends within a suitable recess 1G, formed in the stem 14.

Secured rigidly to the stems 13 and 14 are gear- segments 19 and 20, which serve also as means for preventing longitudinal displacement of the stems. The gear-teeth carried by the segments are offset in order that they may engage with a pair of racks 21 and 22, arranged at diametrically opposite points in an approximately cylindrical shell or casing 23, that surrounds the head-block 11. By arranging the gears at diametrically opposite points the casing may be made of comparatively small diameter and by fitting closely around the stems of the propeller-blades lessen the danger of choking up the propeller by sea-grass or the like.

The opposite sides of the casing, which is preferably made in two sections, are provided with elongated slots 26 for the passage of the stems 13 and 14, and at the outer end of the casing is a suitable bolt 27, connecting the two sections to each other. The forward end of the casing is reduced in diameter and provided with threads for the reception of a threaded cap or sleeve 28, the forward end of which is secured to a hollow shaft or sleeve 29, surrounding the main shaft 10 and extending to the interior of the boat.

In order to adjust the casing, any suitable mechanism may be employed, this in the present instance comprising an adjusting-lever 31, movable over a suitable locking-segment 32 and connected to the sleeve 29. By moving` the lever in one direction or theother the sleeve may be shifted lengthwise of the shaft, andthe racks will operate through the gear-segments to rotate the propeller-blades and adjust the same for the purpose of driving the boat either forward or backward, or by minor adjustment the angle of the blade may be changed in order to increase or decrease the speed of travel of the boat. The blades may, further, be of such shape that when adjusted to a mid-position they will extend on true radial lines and may be revolved in the water without moving' the boat either forward or backward, thus affording a convenient means of stopping' the boat without the vnecessity of stopping the engine.

With a propeller constructed in accordance head-block at the end of the shaft, propeller- IIO blades having interengaging stems extending through said block, gear-segments carried by the stems, a longitudinally-movable casing su rrounding the head-block andslotted for the passage of the stems, and racks carried by the casing and intermeshing with the gearsegments.

2. In a screw-propeller, a shaft, a recessed head-block at the end of the shaft, propellerblades having stems extending through openings in the head-block, gear-segments secured to said stems and serving to prevent longitudinal displacement of the same, and a longitudinally-movable slotted casing surrounding said head-block and having racks with which the gear-segments intermesh.

3. 1n a screw-propeller, the combination with a shaft, of a recessed head-block at the end of the shaft, propeller-blades having interiitting stems extending through the headblock, gear-segments secured to the stems and arranged Within the recessed portion of the head-block, the gear-teeth of the segments being disposed at diametrically opposite points with respect to the axis of the shaft, asectional casing surrounding the shaft and slotted for the passage of said stems, a bolt connecting the outer ends of the casingsections, a cap member secured to and connecting the inner ends of said sections, said cap extending around the shaft, a sleeve secured to the shaft, a sleeve-adjusting means, and racks carried by the casing and `intermeshing with the teeth of the gear-segments.

In testimony that we claim the foregoing as our own We have hereto affixed our signatures in the presence of two witnesses.

i EVERETT B. CUSHMAN.

LESLIE lS. CUSHMAN. lVitnesses:

CARRIE L. AKnsoN, C. C. FLANSBURG.

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