US3116794A - Variable pitch propeller - Google Patents

Variable pitch propeller Download PDF

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Publication number
US3116794A
US3116794A US251380A US25138063A US3116794A US 3116794 A US3116794 A US 3116794A US 251380 A US251380 A US 251380A US 25138063 A US25138063 A US 25138063A US 3116794 A US3116794 A US 3116794A
Authority
US
United States
Prior art keywords
blade
axis
shaft
propeller
block
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US251380A
Other languages
English (en)
Inventor
Harry M Walker
Carl E Beck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL125229D priority Critical patent/NL125229C/xx
Priority to NL302405D priority patent/NL302405A/xx
Application filed by Individual filed Critical Individual
Priority to US251380A priority patent/US3116794A/en
Priority to FR959264A priority patent/FR1387365A/fr
Application granted granted Critical
Publication of US3116794A publication Critical patent/US3116794A/en
Priority to DER36929A priority patent/DE1224353B/de
Priority to GB1102/64A priority patent/GB1041293A/en
Priority to US637006A priority patent/US3400369A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/02—Propeller-blade pitch changing actuated by control element coaxial with propeller shaft, e.g. the control element being rotary
    • B63H3/04—Propeller-blade pitch changing actuated by control element coaxial with propeller shaft, e.g. the control element being rotary the control element being reciprocatable
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit

Definitions

  • This invention relates to variable pitch propellers and more particularly to a variable pitch propeller adapted to be used on boats.
  • variable pitch propeller structure examples include a sliding block, an oscillatably mounted propeller provided With a crank arm and a connecting pin between the sliding block and the crank arm to permit oscillation of the propeller upon axial movement of the block along the propeller shaft.
  • One disadvantage of these prior art structures is that the size of the housing required to house the mechanism becomes too large to be practical.
  • Another disadvantage is that the pitch changing mechanism is not efiicient and does not effect a smooth transition from one position to another.
  • the main object of the present invention is to overcome the disadvantages of prior art variable speed propeller structures.
  • Another object of the invention is the provision of a variable speed propeller structure wherein the pitch adjusting mechanism is housed in as small a space as possible so as to make the device practical.
  • Still another objectof the invention is the provision of a pitch varying mechanism that provides an efiicient mechanical advantage between the sliding block and the oscillatable blade so as to effect a smooth transition from one position of the blade to another.
  • FIG. 1 is a reduced side elevation view of a propeller structure including the pitch varying lever mechanism.
  • FIG. 2 is an enlarged longitudinal sectional view of the propeller supporting housing.
  • FIG. 3 is a cross section of the propeller supporting housing as taken along lines 33 of FIG. 2.
  • FIG. 4 is an end view of a propeller foot portion taken from the inside of the housing.
  • FIG. 5 is a perspective of the slide
  • FIG. 6 is a perspective of the block.
  • the invention includes a drive shaft 1 which is rotatably supported on a bearing 2 and which extends outwardly of the hull (not shown) of the vessel.
  • the outer end of the shaft 1 supports a housing generally designated 3 which is split about centrally of its length to provide a forward section 4 and a rear section 5. Said portions are releasably secured together by means of screws 6 (FIG. 2).
  • drive shaft 1 is provided with a tapered portion 8 which receives the complementarily formed tail portion 9 of housing section 5.
  • Said housing section 5 is fixedly secured to shaft 1 by means of nut 12 which is threadedly received on a reduced diameter terminal portion 13 of shaft 1.
  • a block generally designated 16 which is best seen in FIG. 6.
  • Said block 16 is generally elongated and provided with an axially extending bore 17 through which shaft 1 extends.
  • the example of the invention illustrated 3,116,794 Patented Jan. 7, 1964 in the drawings includes three propeller blades and for this reason the block 16 is formed at one end to a triangular cross section to provide three generally rectangular outwardly directed faces 18.
  • the remainder of block 16 is generally cylindrical except that it is provided with flats 19 in coplanar continuation of faces 18.
  • the block terminates at its forward end in a cylindrical end portion 20 which is internally threaded to receive threaded end 21 (FIG. 2) of an actuating tube generally designated 22.
  • Each face of block 16 is provided with a hole 25 which receives therein a relatively short pin 26 integral with and extending outwardly of one side of a generally rectangular elongated slide generally designated 27 (FIG. 5).
  • the slide 27 is supported on the face 18 and is swingable about the pivot pin 26.
  • Slide 27 is slidably received within a complementarily formed slot 35 formed in the inner end of the propeller blade generally designated 31.
  • Each of the three propeller blades shown includes a blade portion 32, a journal portion 33, and a foot portion 34 (FIG. 3) within which the slot 30 is formed.
  • the slide 27 is shown in a position at right angles to the central plane of the shaft 1 and such position may be considered substantially neutral in that the angle of the propeller blade is such that the least amount of propulsion effort is transferred to the propellers.
  • the propeller blade oscillates in a clockwise direction (FIG. 2) increasing its angle of attack and augmenting its thrust in the water.
  • the full forward position is indicated schematically in FIG. 2 and corresponds to the position of the blades exerting the greatest amount of propulsive effort.
  • the blade Upon movement of the block 16 to the right as seen in FIG. 2, the blade oscillates in a counter clockwise direction from the neutral position shown in full line thereby effecting reversal of the angle of the blade causing the craft to be driven in a reverse direction. It will be apparent that the angle through which the slide 27 moves to achieve a full reverse position need not be as great as that required in a forward direction since the speed required in reverse is substantially lower than that required in forward.
  • the central axis of the propeller blade 31 is offset with respect to the central axis of the shaft 1 so that said axes do not intersect.
  • the axis of the propeller blade may be considered parallel to a particular plane containing the central axis of the shaft 1.
  • the axis of the propeller never intersects said particular plane.
  • the pivot pin 26 is on the opposite side of said particular plane of shaft 1 from the axis of propeller blade 31.
  • bearing 40 In order to effect the desired translatory movement of block 16 relative to shaft 1 bearing 40 is connected by pivot pins 41 to a yoke 43 which in turn is secured to the lower end of an elongated vertically disposed operating lever 42.
  • the lower ends of the legs of the yoke 42 are provided with pins 45 to which are pivotally connected the corresponding ends of a pair of links 46 which extend from said pins 45 to pivot pins 47 carried by the bearing 2 which rotatably supports the main shaft 1.
  • Adjustability of the maximum forward pitch may be effected by providing a bushing 54 which is rotatably supported in movable bearing 40 in which the threaded end 55 of tube 22 is received.
  • a lock nut 56 may be provided to fixedly secure tube 22 to bushing 54 in the desired adjusted position.
  • an arm 60 rigid with each leg of U- shaped yoke 42 may be provided and may cooperate With a spring urged pin such as indicated at 61 in FIG. 1 for holding the linkage in said neutral position subject to its being changed by sufficient force being exerted on lever 43 to move it past spring urged pin 61.
  • a variable pitch propeller structure comprising:
  • a propeller blade mounted in said housing with its axis in a plane at right angles to said shaft
  • said blade being provided with a groove extending radially of its axis
  • pivot means pivotally connecting said slide to said block for pivoting said slide about an axis parallel to the axis of said blade
  • the axes of said blade and said pivot means being on opposite sides respectively of the axis of said shaft.
  • pivot means comprises a pin integral with said slide and received in a hole in said block.
  • a three bladed variable pitch propeller structure comprising:
  • said blades being provided at said corresponding ends with grooves extending radially of the axes of said blades,
  • pivot means pivotally connecting said slides to said block for pivoting said slides about axes parallel to the axes of their corresponding blades
  • the axis of oscillation of each blade and the axis of the corresponding pivot means being on opposite sides of the axes of said shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Dc Digital Transmission (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
US251380A 1963-01-14 1963-01-14 Variable pitch propeller Expired - Lifetime US3116794A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL125229D NL125229C (enrdf_load_stackoverflow) 1963-01-14
NL302405D NL302405A (enrdf_load_stackoverflow) 1963-01-14
US251380A US3116794A (en) 1963-01-14 1963-01-14 Variable pitch propeller
FR959264A FR1387365A (fr) 1963-01-14 1964-01-03 Système de communication
DER36929A DE1224353B (de) 1963-01-14 1964-01-08 Verfahren und Schaltungsanordnung zur Informationsuebertragung unter Verwendung von Impulspaaren
GB1102/64A GB1041293A (en) 1963-01-14 1964-01-09 Communication systems
US637006A US3400369A (en) 1963-01-14 1967-05-08 Pulse doublet communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US251380A US3116794A (en) 1963-01-14 1963-01-14 Variable pitch propeller

Publications (1)

Publication Number Publication Date
US3116794A true US3116794A (en) 1964-01-07

Family

ID=22951712

Family Applications (1)

Application Number Title Priority Date Filing Date
US251380A Expired - Lifetime US3116794A (en) 1963-01-14 1963-01-14 Variable pitch propeller

Country Status (4)

Country Link
US (1) US3116794A (enrdf_load_stackoverflow)
DE (1) DE1224353B (enrdf_load_stackoverflow)
GB (1) GB1041293A (enrdf_load_stackoverflow)
NL (2) NL125229C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967916A (en) * 1973-06-11 1976-07-06 Chittom Charles N Fan assembly

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US617373A (en) * 1899-01-10 Adjustable propeller
US676738A (en) * 1901-03-02 1901-06-18 William Rowland Edwards Electrically-propelled boat.
US810032A (en) * 1902-04-12 1906-01-16 Alexander T Brown Propeller.
US885038A (en) * 1906-11-20 1908-04-21 Albert Gnaegy Propeller.
GB190929829A (en) * 1909-12-21 1910-04-21 William Dick Mclaren Improvements in Reversible Propellers.
US1891384A (en) * 1930-08-04 1932-12-20 Joseph R Gillis Aircraft propeller
US2269833A (en) * 1941-01-11 1942-01-13 Upton Clayton Propeller
GB614731A (en) * 1946-07-23 1948-12-22 Henry Percy Bowler Improvements in or relating to screw propellers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL89769C (enrdf_load_stackoverflow) * 1955-09-02

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US617373A (en) * 1899-01-10 Adjustable propeller
US676738A (en) * 1901-03-02 1901-06-18 William Rowland Edwards Electrically-propelled boat.
US810032A (en) * 1902-04-12 1906-01-16 Alexander T Brown Propeller.
US885038A (en) * 1906-11-20 1908-04-21 Albert Gnaegy Propeller.
GB190929829A (en) * 1909-12-21 1910-04-21 William Dick Mclaren Improvements in Reversible Propellers.
US1891384A (en) * 1930-08-04 1932-12-20 Joseph R Gillis Aircraft propeller
US2269833A (en) * 1941-01-11 1942-01-13 Upton Clayton Propeller
GB614731A (en) * 1946-07-23 1948-12-22 Henry Percy Bowler Improvements in or relating to screw propellers

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967916A (en) * 1973-06-11 1976-07-06 Chittom Charles N Fan assembly

Also Published As

Publication number Publication date
NL302405A (enrdf_load_stackoverflow)
DE1224353B (de) 1966-09-08
NL125229C (enrdf_load_stackoverflow)
GB1041293A (en) 1966-09-01

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JP2600070B2 (ja) 推力を三次元方向に調節できる可変ピツチプロペラ