US1588986A - Propeller - Google Patents

Description

0. OHLSON PROPELLER June 15 1926..

Filed August 26, 1925 Patented June 15, 1926.

UNITED STATES; ATENT 1,588,88-i8 FICE.

OLOF OI-ILSON, 01? WEST NE'W'ION, MASSACHUSETTE, ASSIGNOR T GILBERT J. MCCARTHY, OF \VASHING-TON, DISTRICT OF COLUMBIA.

PROPELLER.

Application filed August 26, 1925. Serial No. 52,607.

This invention relates to improvements in propellers and particularly in the structural arrangement thereof.

An object of the invention resides in providing a propeller structure conformed of a plurality of blade sections of members which have hub portions adapted for intertitting connection to mount the blades in assembled. propeller forming relation.

A further object of the invention resides in providing a propeller structure wherein the blades and the entire structure is adapted to be manufactured from strip material so that a plurality of radially arranged blades may be provided with hub portions adapted for interfitting connection to form a rigid assembled propeller structure.

The invention comprehends a novel construction of propeller having numerous advantages which are particularly pointed out in the following description and in the claims directed to a preferred form of the invention, it being understood however, that various changes shape and relation parting from the may be made in the size,

of the parts without despirit or scope of the ininvention as herein set forth.

In the drawing forming cation part of this appli- Figure 1 is an end elevation of the im proved novel propeller construction.

Fig. 2 disassembled prespective view of the blade sections adapted for interfitting connection to form a completed propeller.

The novel propeller construction forming the subject matter of this invention includes a plurality of independent blade sections and in the present case, two blade sections are shown indicated by the numerals 1 and 2 respectively. These blade sections include the radial blades 3, the base portions of which extend axially of the the propeller as indicated by while the ends of the blades hub portion of the numeral 4, are twisted out of the axial plane so that they will be rotated by or direct a current of air axially relative to said propeller.

These blades are formed of strip material and having hub portions 5 formed as an integral part thereof joining the blades 3 at the base portions 4. In the form of the invention illustrated in the drawing, the hub I portionsfi are formed of extending blades, of

arcuate portions 6 from the base portion 4 of the substantially semi-circular form At the end of the semi-circular portion 8 is formed another offset portion 9 from which extends a third arcuate portion 10 in adjacent spaced relation to the portion 6 and 06 concentric relative thereto.

As shown in 2 of the drawing, all of the blade sections are of identical construction and when placed in the position shown in Fig. 2, they complete propeller structure as illustrated in Fig. 1, inwhich the portions 6, 8 and 10 have interfitting relation and closely contact with one another to form a complete solid propeller hook and at the same time preventing circumferential movement of the blades and hub sections relative to one another so that a rigid structure results. It is to be particularly noted that the entire propeller structure is formed of strip material and that the offset portions '7 and 9 are sufficient to space the semi-circular portions 6, 8 and 10 inwardly in stepped relation equal to the thickness of the strip material from which the sections are formed.

It is to be further noted from an inspection of Fig. 1 that the bearing surface on the interior of the hub portion is provided. partly in each of the blade sections and that the same is of substantially true cylindrical form from which the blades extend in radial relation.

It is also to be further noted that the in terfitting relation produced prevents circumferential movement between the blade sectionsdue to the interfitting relation of the offset portions 7 and 9 respectively.

From the foregoing description it will be readily apparent that a substantially simple and yet highly practical propeller construction has been provided which may be manufactured of strip material which is adapted for use in the manufacture of numerous types of small size propellers such as for fans, gas mixers and the like.

Having thus described my invention, what claim as new is 1. A propeller comprising a plurality of blade sections formed of strip material having hub portions formed on one end thereof will slidably interfit to form a 7 0 including a plurality of arcuate concentric interconnected sections adapted for slidable interfitting connection in propeller forming relation.

2. A propellercomprising a plurality of independent blade sections having mating interfitting hub forming sections including means providing self locking cooperationin" propeller forming relation.

3. A propeller comprising a plurality of blade sections havingrhub portions formed on one end for concentric slidable interfitting relation.

i. A propeller comprising a plurality of blade sections having for concentric slidable interlitting relation,

hub portions formed and means formed on said hub portions to provide self locking between the sections in assembled relation.

5. A propeller comprising a plurality of blade sectionsformed or strip material having hub portions formedon one end thereof including a plurality of concentric interconnected sections adapted for slidable interlitting connections in propeller "forming relation, and means formed at the juncture of said inner connected concentric sections for providing self locking cooperation of the lade sections.

In testimony whereof I 'afiix my signature.

OLOF' OHL'SON.

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