US1508086A - Rotary fan - Google Patents

Rotary fan Download PDF

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Publication number
US1508086A
US1508086A US649072A US64907223A US1508086A US 1508086 A US1508086 A US 1508086A US 649072 A US649072 A US 649072A US 64907223 A US64907223 A US 64907223A US 1508086 A US1508086 A US 1508086A
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Prior art keywords
fan
axial line
approximately
rotary fan
line
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Expired - Lifetime
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US649072A
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Ralph F Crawford
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans

Definitions

  • U l T E f isa-aast RALPH F.
  • CRAWFORD 0F SALINA, KANSAS.
  • the invention relates to rotaryv fans, designed to throw a column of air in a given direction, for purposes of cooling, ventilating or wherever a fan would be useful, and also for purposes of propulsion, the object being to increase the efficiency or to displace a maximum volume of air for a 'given size of fan, power applied, and speed of rotation.
  • the invention consists in the novel construction and combinations of parts, as' hereinafter set forth.
  • the numerals l, 1, designatethe radial blades of the fan or propeller, joined by a cent-ral plate 2 or other hub member.
  • the complete fan or propeller comprises two sheet metal portions, each consisting 'of opposite blades 1, l, and a plate 2, perforated at 3 for securing screws, whereby the fan or propeller may be mounted upon a shaft.
  • each blade is formed with a forward edge portion 4, disposed at an angle (60 degrees as shown) from the axial line o-f the fan; a middle portion 5 preferably disposed at a higher angle from said axial line (75 degrees as shown), and a rear portion 6, having a major part thereof disposed in an arc of approximately 75 degrecs, and ending preferably in a short marginal part 7, lying parallel with said axial line;
  • the forward and middle portions 4 and 5 comprise each approximately one-fourth of the blade,l and the rear portion 6 one-half thereof.
  • the forward edge portion 4 of the fan blade is designed to feed air to the blade pocket formed by the portions 5 and 6, by the latter of which said air will be thrown rearwardly to be utilized as desired.
  • thls fan may be driven with an unusually loose belt, considering the pressure of air displacement.
  • the forward portion 4 of the respective blades may be varied from approximately the angle shown in Figure 3 in full lines to the dotted line showing'of said portion 4 1n line with 'the middle portion 5.
  • the forward and middle portions 4 and 5 when so 1n line or in theA same plane constitute together a 'forward portion of the blade equal 1n extentor area to the rear portion 6 of the blade.
  • radial blades having each a forward portion having an angular relation to the axial line of the fan, and a rear portion including the balance of the bladel and approximately equal in extent to said forward portion and having the major part thereof disposed inan arc subtending an angle equal to that subtended by said forward portion and said axial line.
  • radial blades having each a forward ortion having an angular relation to the axial line of the fan, a middle portion having a higher angular relation to said line, and a rear portion approximately equal in extent to said forward and middle portions and :disposed in an arc.
  • radial blades having each a forward portion having-an angular relation to the axial line of the fan, a middle portion having a higher angular rela' tion to said line, and a rear portion approximately equal in extent to said forward and middle portions and disposed in an arc subtending an angle equal to that subtended byl said middle portion and said axial line.
  • radial blades having each a forward portion having an angular relation to the axial line of the fan of approximately 60 degrees, a middle portion aving a higher angular relation to said line of approximately 75 degrees, and a rear portion approximately equal in extent to said forward and middle portions and disposed in an arc subtending an angle of approximately-75 degrees.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Sept. 9 19241- 1,508,086
R. F. CRAWFORD ROTARY LFAN Filed July 2. 1923 Patented Sept. 9, 1924.
U l T E f isa-aast RALPH F. CRAWFORD, 0F SALINA, KANSAS.
ROTARY FAN.
Application filed July 2,
'To all whom z't may concer/1,.'
Be it known that I, RALPH F. CRAWFORD, a citizen of the United States, residing at Salina, in the county of Saline and State of Kansas, have made a certain new and useful Invention in Rotary Fans, of which the following is a specification.
The invention relates to rotaryv fans, designed to throw a column of air in a given direction, for purposes of cooling, ventilating or wherever a fan would be useful, and also for purposes of propulsion, the object being to increase the efficiency or to displace a maximum volume of air for a 'given size of fan, power applied, and speed of rotation.
The invention consists in the novel construction and combinations of parts, as' hereinafter set forth.
In the accompanying drawings illustrating an embodiment of the invention, the numerals l, 1, designatethe radial blades of the fan or propeller, joined by a cent-ral plate 2 or other hub member. As shown, the complete fan or propeller comprises two sheet metal portions, each consisting 'of opposite blades 1, l, and a plate 2, perforated at 3 for securing screws, whereby the fan or propeller may be mounted upon a shaft.
In cross section, each blade is formed with a forward edge portion 4, disposed at an angle (60 degrees as shown) from the axial line o-f the fan; a middle portion 5 preferably disposed at a higher angle from said axial line (75 degrees as shown), and a rear portion 6, having a major part thereof disposed in an arc of approximately 75 degrecs, and ending preferably in a short marginal part 7, lying parallel with said axial line; The forward and middle portions 4 and 5 comprise each approximately one-fourth of the blade,l and the rear portion 6 one-half thereof.
In operation, the forward edge portion 4 of the fan blade is designed to feed air to the blade pocket formed by the portions 5 and 6, by the latter of which said air will be thrown rearwardly to be utilized as desired.
It is found in practice that a fan made as stated will show considerably greater eili- 'ciency than fans of common commercial type, such for instance as the propeller type fans used in automobile engine cooling sys- 1923. Serial No. 649,072.
tems. It is further found. in practice that thls fan may be driven with an unusually loose belt, considering the pressure of air displacement.
The forward portion 4 of the respective blades may be varied from approximately the angle shown in Figure 3 in full lines to the dotted line showing'of said portion 4 1n line with 'the middle portion 5. The forward and middle portions 4 and 5 when so 1n line or in theA same plane constitute together a 'forward portion of the blade equal 1n extentor area to the rear portion 6 of the blade.
I claim:
1. In a rotary fan, radial blades having each a forward portion having an angular relation to the axial line of the fan, and a rear portion including the balance of the bladel and approximately equal in extent to said forward portion and having the major part thereof disposed inan arc subtending an angle equal to that subtended by said forward portion and said axial line.
2. In a rotary fan, radial blades having each a forward ortion having an angular relation to the axial line of the fan, a middle portion having a higher angular relation to said line, and a rear portion approximately equal in extent to said forward and middle portions and :disposed in an arc.
3. In a rotary fan, radial blades having each a forward portion having-an angular relation to the axial line of the fan, a middle portion having a higher angular rela' tion to said line, and a rear portion approximately equal in extent to said forward and middle portions and disposed in an arc subtending an angle equal to that subtended byl said middle portion and said axial line.
4. In a rotary fan, radial blades having each a forward portion having an angular relation to the axial line of the fan of approximately 60 degrees, a middle portion aving a higher angular relation to said line of approximately 75 degrees, and a rear portion approximately equal in extent to said forward and middle portions and disposed in an arc subtending an angle of approximately-75 degrees.
l In testimony whereof I affix my signature.
RALPH F. CRAWFORD.
US649072A 1923-07-02 1923-07-02 Rotary fan Expired - Lifetime US1508086A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581873A (en) * 1947-12-17 1952-01-08 Torrington Mfg Co Fan blade and its formation
US3101662A (en) * 1959-09-03 1963-08-27 Lawrence L Alldritt Roof ventilator
US3659959A (en) * 1970-07-15 1972-05-02 Fasco Industries Air fan impeller blade assembly
US4028007A (en) * 1975-08-18 1977-06-07 Torin Corporation Propeller fan
FR2384974A1 (en) * 1977-03-22 1978-10-20 Torin Corp Propeller fan with spider blades - has central twist in blade with spot welded supports
US6010307A (en) * 1995-07-31 2000-01-04 Mccabe; Francis J. Propeller, structures and methods
US6039533A (en) * 1995-07-31 2000-03-21 Mccabe; Francis J. Fan blade, structures and methods
US6190122B1 (en) * 1997-12-13 2001-02-20 Mccabe Francis J. Intake and exhaust air damper with movable motor fan assembly
US20020176322A1 (en) * 2001-05-22 2002-11-28 Frank Kupidlowski Sanitary mixing assembly for vessels and tanks
US20050129523A1 (en) * 2003-12-11 2005-06-16 Liu Ching Wen W. Ceiling fan blade
USD909562S1 (en) 2015-01-12 2021-02-02 Hunter Fan Company Ceiling fan blade

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2581873A (en) * 1947-12-17 1952-01-08 Torrington Mfg Co Fan blade and its formation
US3101662A (en) * 1959-09-03 1963-08-27 Lawrence L Alldritt Roof ventilator
US3659959A (en) * 1970-07-15 1972-05-02 Fasco Industries Air fan impeller blade assembly
US4028007A (en) * 1975-08-18 1977-06-07 Torin Corporation Propeller fan
FR2384974A1 (en) * 1977-03-22 1978-10-20 Torin Corp Propeller fan with spider blades - has central twist in blade with spot welded supports
US6010307A (en) * 1995-07-31 2000-01-04 Mccabe; Francis J. Propeller, structures and methods
US6039533A (en) * 1995-07-31 2000-03-21 Mccabe; Francis J. Fan blade, structures and methods
US6190122B1 (en) * 1997-12-13 2001-02-20 Mccabe Francis J. Intake and exhaust air damper with movable motor fan assembly
US20020176322A1 (en) * 2001-05-22 2002-11-28 Frank Kupidlowski Sanitary mixing assembly for vessels and tanks
US6866414B2 (en) * 2001-05-22 2005-03-15 Jv Northwest, Inc. Sanitary mixing assembly for vessels and tanks
US20050175460A1 (en) * 2001-05-22 2005-08-11 Frank Kupidlowski Sanitary mixing assembly for vessels and tanks
US20050175464A1 (en) * 2001-05-22 2005-08-11 Frank Kupidlowski Sanitary mixing assembly for vessels and tanks
US7402023B2 (en) 2001-05-22 2008-07-22 J.V. Northwest, Inc. Sanitary mixing assembly for vessels and tanks
US20050129523A1 (en) * 2003-12-11 2005-06-16 Liu Ching Wen W. Ceiling fan blade
US6991431B2 (en) * 2003-12-11 2006-01-31 Winston Liu Ching Wen Ceiling fan blade
USD909562S1 (en) 2015-01-12 2021-02-02 Hunter Fan Company Ceiling fan blade
USD909561S1 (en) 2015-01-12 2021-02-02 Hunter Fan Company Combination ceiling fan blade and light kit

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