US794984A - Propeller. - Google Patents

Description

BEST AVAILABLE CO? No. 794,984. PATENT}; ,Y 1a, 1905.

. J. HUBER.

PROPELLBR.

APPLICATION FILED JAN. 12, 1904.

BEST AVAlLABLE coP No. 794,98e.

UNITED STATn-s Patented July 18, 1905.

JOSE HUBER, OF SANTIAGO, CHILE.

PROPELLER.

SPECIFICATION forming part of Letters Iatent No. 794,984, dated July 18, 1905.

Application filed IanuarylZ, 1904. Serial No. 188,813.

skilled in the art to which it appertains to make and use the same.

This invention relates to propelling devices,

and particularly screw-propellers, the object being the provision of a substitute for the ordinary propeller-screw having rigid blades and at the same time doing away with the dis advantages incident to propeller-blades of the ordinary construction.

In the accompanying drawings I have illus- 'trated a propeller embodying my invention.

In the drawings, Figure 1 represents a propeller in side elevation, partly in section; and Fig. 2 is a rear view of the same.

My improved propeller may be mounted upon the rear end of the usual or any suitable propeller-shaft and in operation is rotated the same as the ordinary screw.

The blades a of the propeller consist of a plurality of yielding spring-metal plates a, being preferably of the same dimensions in one way and of varying dimensions in the other, the result being that the resiliency of the blade increases as one edge is approached. These several overlying resilient plates are inclosed between two resilient plates having the same dimensions and which are preferably of larger area than the inclosed plates, so as substantially to cover them, whereby the blade is given a smooth outer surface on both sides. That edge of the blade having the greater rigidity is bolted or otherwise securely fixed to rigid arms 6', which project at substantially right angles from a hub c, secured to the shaft 6 in the usual manner. The position of the arms and the blades is such relative to the shaft that while the arms project at substantially right angles to the shaft the blades are disposed at an angle of about fortyfive degrees to the axis of the shaft, as will be seen from Fig. 1.

plished by the forward supported edge of the blade secured to the arms 6 and the unsupported yielding portions of the blade trail behind, as it were, whereby the danger of breakage is practically eliminated and the. fluttering which is common to yielding propellerblades under stress is obviated. I 5

It will be readily seen that as the propeller is rotated in one or the other direction the resistance of the water will cause a bending of the blades, as indicated in Fig. 1,- and the spring action of the blades will result in a yielding forward impulse to the shaft. The resiliency of the blades reduces the shock and the strain upon the engines in starting the vessel and in suddenly stopping or reversing the same. Moreover, the water will not be agitated to the same extent, which latter is an advantage in harbors wherejsmallv boats abound. By reason of the built-up character of the blades and the method of securing the same to the shaft repairs are readily made under circumstances which would ordinarily be prohibitive Moreover, it has been demonstrated by actual test that by means of a propellerconstructed in accordance with my invention more efficient results are obtained from the same expenditure of power than in the case of propellers of ordinary construction.

It will be noted from the above that one of the essential characters of a propeller made in accordance with my invention is that substantially each portion of the resilient blade lies within a circle struck from the axis of the propeller-shaft b as a center and having a radius equal to the distance from the axis of the shaft to the ends of the supporting-arms 5, such distance being referred to in the claims as the length of the arms. In other \VOIUQ, substantially each portion of the operative surface of the blades lies within a circle equal in diameter to that described by the arms when in operation.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a propeller, the combination, with a shaft, of arms carried thereby and so proportioned as to have substantially no propelling power, and propelling-blades secured to the arms, substantially each portion of the operative surface of the blades lying within a circle equal in diameter to that described by the arms when in operation.

2. In a propeller, the combination, with a shaft, of arms carried thereby and so proportioned as to have substantially no propelling power, and resilient propelling-blades secured to the arms, substantially each portion of the operative surface of the blades lying within a circle equal in diameter to that described by the arms when in operation.

3. In a propeller, the combination with a shaft, and rigid supporting-arms carried there by and so proportioned as to have substantially no propelling power, of resilient propelling-blades secured to the arms in such relation that substantially each portion of the operative surface thereof is embraced within a circle struck from the axis of the shaft and having a radius equal to the length of the arms.

4. In a propeller, the combination, with a shaft and arms carried thereby and so proportioned as to have substantially no propelling power,of resilient laminated propelling-blades secured to the arms, substantially each portion of the operative surface of the blades lying within a circle struck from the axis of the shaftand having a radius equal to the length of the arms.

5. In a propeller, the combination, with a shaft, and supporting-arms carried thereby and so proportioned as to have substantially no propelling power, of resilient propellingblades secured to the arms at an angle of substantially forty-five degrees to the axis of the shaft, substantially each portion of the operative surface of the blades lying within a circle struck from the axis of the shaft and having a radius equal to the length of the arms.

6. In a propeller, the combination, with a shaft, and supporting-arms carried thereby, of blades secured to the arms, said blades having the shape of a rhomboid of such obliquity that substantially each portion of the operative surface of the blades lies within a circle having a radius equal to the length of the supporting-arms.

7. In a propeller, the combination with a shaft, and supporting-arms carried thereby,

I ee s-"r AVAILABLE COP .uemlaminated blades secured to the a. .-..s, said blades having the shape of a rhomboid of such obliquity that substantially each portion of the operative surface of the blades lies within a circle struck from the axis of the shaft and having a radius equal to the length of the arms.

8. In a propeller, the combination, with a shaft, and supporting-arms carried thereby, of resilient laminated blades secured to the arms at an angle of approximately forty-five degrees to the shaft, said blades having the shape of a rhomboid and substantially each portion of their operative surface lying within a circle struck from the axis of the shaft and having a radius equal to the length of the arms.

9. In a propeller, the combination, with a shaft, and rigid supportingarms carried thereby, of resilient laminated blades secured to the arms at substantially right angles to the shaft, said blades being composed of a plurality of plates of unequal length arranged between two outer plates of substantially equal dimensions and having the shape of a rhomboid, substantially each portion of the operative surface of the blades lying within a circle struck from the axis of the shaft and having a radius equal to the length of the arms.

10. In a propeller, the combination with a shaft, and supporting-arms carried thereby, of resilient blades secured to the arms at an angle of substantially forty-five degrees to the'shaft, said blades being composed of a plurality of plates of spring metal having the shape of a rhomboid, substantially each portion of the operative surface of the blades lying within a circle struck from the axis of the shaft and having a radius equal to the length of the arms.

11. A propeller provided with flexible resilient laminated blades presenting an unbroken operative surface on both sides.

12. A propeller provided with flexible resilient laminated blades presenting an un broken operative surface on both sides, the flexibility of each blade increasing with the distance from its point of support.

13. A propeller-blade composed of resilient plates so proportioned as to presentupon both sides an unbroken operative surface.

14:. A propeller-blade comprising resilient plates disposed between two outer plates having substantially the same dimensions, the outer plates being of a size equal to or greater than the inner plates.

15. A propeller-blade comprising resilient plates of unequal length arranged between two outer plates of substantially equal dimensions, the outer plates being of a size equal to or greater than the largest of the inner plates.

BEST AVAlLABLE eoP 16. A propeller provided with blades each this specification in the presence of two ithaving the shape of a rhomboid idnclined tod-l nesses. ward the axis of the propeller an compose a of resilient plates of unequal size arranged Josh HUBER" 5 between two outer plates of substantially the Witnesses:

same size. HERMANN SOHELLING,

in testimony whereof I afiix my signature to CLARA I. PARKER.

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