US3289924A - Flexible blade fan - Google Patents

Flexible blade fan Download PDF

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Publication number
US3289924A
US3289924A US454458A US45445865A US3289924A US 3289924 A US3289924 A US 3289924A US 454458 A US454458 A US 454458A US 45445865 A US45445865 A US 45445865A US 3289924 A US3289924 A US 3289924A
Authority
US
United States
Prior art keywords
fan
blades
blade
arm
arms
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
US454458A
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English (en)
Inventor
Thomas J Weir
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.)
Household Manufacturing Inc
WILLIAM WALLACE CORP
Original Assignee
WILLIAM WALLACE CORP
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
Application filed by WILLIAM WALLACE CORP filed Critical WILLIAM WALLACE CORP
Priority to US454458A priority Critical patent/US3289924A/en
Priority to DE19661628420 priority patent/DE1628420C/de
Priority to GB20605/66A priority patent/GB1105865A/en
Priority to SE6406/66A priority patent/SE312395B/xx
Application granted granted Critical
Publication of US3289924A publication Critical patent/US3289924A/en
Assigned to HOUSEHOLD MANUFACTURING, INC., reassignment HOUSEHOLD MANUFACTURING, INC., CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE JAN. 3,1983, DELAWARE Assignors: WALLACE MURRAY CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/06—Controlling of coolant flow the coolant being cooling-air by varying blade pitch
    • 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
    • F04D29/38—Blades
    • F04D29/382—Flexible blades

Definitions

  • FIG. 1 is a front view of a fan assembly embodying the present invention.
  • FIG. 2 is a fragmentary, side vie-w illustrating in detall the construction of the junction between the fan blades and the spider of FIG. 1.
  • FIG. 3 is a side, sectional view of a modified form of the mounting for the flexible fan blades.
  • the fan assembly includes a spider having a hub portion 11 and a series of radially extending arms 12.
  • the hub portion may be apertured as indicated at 13 for attachment to a driving pulley, and the arms 12 may, as indicated in FIG. 1, be spaced at various angles with respect to each other.
  • each of the arms carries a flexible fan blade 14. Between each of the blades 14 and its corresponding spider arm 12 is a clamp member 17 which extends beyond the ends of the arms as will be apparent in FIG. 1.
  • Each of the clamp members 17 is generally U-shaped in cross-section with the area of junction of its legs adjacent the leading edge of 12a of its respective arm 12.
  • a backing plate 18 lies adjacent to each of the fan blades and extends into its clamp member 17. Rivets 21 are spaced along the length of the spider arm and serve to rigidly join the arm, clamp member, blade and backing plate. The backing plate 18 deflects, under load, with the fan blade 14 as will subsequently be described.
  • the fan blades 14 will be acted on by a force tending to deflect or bend the blades in the direction of the arrow shown in FIG. 2. If this force is of sufficient magnitude, the backing plates 18 will also deflect somewhat. As the speed of rotation of the fan increases, this deflecting force becomes larger and the blades 14 tend to flatten or unload.
  • each of the blades can be considered to be a cantilever beam with the clamp being provided at the rivets 21, the beam being under a uniformly distributed load.
  • the presence of the backing plate 18 in the structure of the present invention serves to, in effect, increase the cross-section of the beam formed by the blade along a portion of its length nearest its clamped end. This more uniformly distributes the total stress, along the width of the blade and avoids the high concentration of stress at the riveted or welded attachment of the blade to the spider arm which is characteristic of the prior art structures.
  • the more uniform distribution of stresses across the width of the flexible fan blades which is inherent in the stnloture of the present invention, results in a substantially improved service life for the blades. Further, because of differences in the application of the deflecting load, as the blade 14- and backing plate 18 deflect, they move slightly relative to each other and this relative motion has a damping effect on blade vibration at resonant fan speeds.
  • the hacking plate 18a differs from backing plate 18 of FIG. 2 in that its marginal area 18b is flanged outwardly somewhat away from the blade 14. This arrangement limits deflection of the blade and provides further reinforcement at maximum deflection conditions, the position assumed by the blade and backing plate under these conditions being shown in broken lines in FIG. 3.
  • a fan structure including a spider having arms extending radially outward from a central hub portion, clamp members overlying one face of each of said arms and extending beyond the ends of said arms, each of said clamp members having its marginal portion adjacent the leading edge of its respective arm folded upon itself to provide a generally U-shaped configuration, a flexible fan blade extending into each of said clamp members, a backing plate overlying each of said blades and extending into said clamp member and substantially to the trailing edge of the arm, and fastening means spaced along the length of each arm to rigidly join the arm, clamp member, blade and backing plate, whereby stress in the blades to flexing of the blades and the backing plates is more evenly distributed across the width of the blade and stress concentration at said fastening means is avoided.
  • a fan structure including a spider having arms extending radially outward from a central hub portion, clamp members overlying one face of each of said arms and extend-ing beyond the ends of 'said arms, each of said clamp members having its marginal portion adjacent the leading edge of its respective arm folded upon itself to provide a generally U-shaped configuration, a flexible fan blade extending into each of said clamp members, a backing plate overlying each of said blades and extending into said clamp member, and fastening means spaced 3 along the length of each arm to rigidly join the arm, clamp member, blade [and backing plate, whereby stress in the blades due to flexing of the blades and the backing plates is more evenly distributed across the width of the blade and stress concentration at said fastening means is 5 avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US454458A 1965-05-10 1965-05-10 Flexible blade fan Expired - Lifetime US3289924A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US454458A US3289924A (en) 1965-05-10 1965-05-10 Flexible blade fan
DE19661628420 DE1628420C (de) 1965-05-10 1966-05-06 Ventilatorlaufrad
GB20605/66A GB1105865A (en) 1965-05-10 1966-05-10 Flexible blade fan
SE6406/66A SE312395B (mo) 1965-05-10 1966-05-10

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US454458A US3289924A (en) 1965-05-10 1965-05-10 Flexible blade fan

Publications (1)

Publication Number Publication Date
US3289924A true US3289924A (en) 1966-12-06

Family

ID=23804686

Family Applications (1)

Application Number Title Priority Date Filing Date
US454458A Expired - Lifetime US3289924A (en) 1965-05-10 1965-05-10 Flexible blade fan

Country Status (3)

Country Link
US (1) US3289924A (mo)
GB (1) GB1105865A (mo)
SE (1) SE312395B (mo)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356154A (en) * 1966-11-16 1967-12-05 Ford Motor Co Flexible blade engine cooling fan
US3406760A (en) * 1967-09-18 1968-10-22 Wallace Murray Corp Flexible blade fan
US3594098A (en) * 1969-02-28 1971-07-20 Fram Corp Fan with weighted flexible blades
US3639079A (en) * 1970-03-12 1972-02-01 Fram Corp Flexible-bladed fan with improved reinforcing cap
US3639078A (en) * 1970-11-04 1972-02-01 Shrinivas V Pratinidhi Flexible-bladed fan with extended blade structure
US3679321A (en) * 1971-04-26 1972-07-25 Fran Corp Prestressed flexible bladed fan
US3773435A (en) * 1971-07-23 1973-11-20 Brookside Corp Flexible blade fan
US3785748A (en) * 1972-02-03 1974-01-15 Hayes Albion Reinforced automotive fan
US3799697A (en) * 1972-11-29 1974-03-26 Fram Corp Flexible bladed fan with tab connected reinforcing member
US3836284A (en) * 1972-03-10 1974-09-17 Fram Corp Controlled deflection flexible bladed fan
US3860362A (en) * 1973-12-14 1975-01-14 Ford Motor Co Flexible bladed fan
US3910718A (en) * 1974-03-18 1975-10-07 Fram Corp Limited deflection flexible bladed fan for use with viscous shear clutch
US4187055A (en) * 1978-04-03 1980-02-05 Vernco Corporation Flexible fan
US20210402118A1 (en) * 2018-10-05 2021-12-30 Tecnicas Biomedicas Para La Salud, S.L. Driving device for providing assisted ventilation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711219A (en) * 1971-09-20 1973-01-16 Fram Corp Fan connecting reinforcing cap to hub
DE19641099C2 (de) * 1996-10-04 1999-04-29 Braun Ag Laufrad in einem Haartrockner oder Haartrocknerzusatzgerät

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191669A (en) * 1922-05-24 1923-01-18 Edwin Lawrance Walker Improvements in or relating to screw propellers with flexible blades
US1526657A (en) * 1923-08-24 1925-02-17 Bea Henry Flying machine
US2032224A (en) * 1933-02-01 1936-02-25 Packard Motor Car Co Fan
US2149267A (en) * 1936-04-02 1939-03-07 Gen Motors Corp Fan
US2406499A (en) * 1943-08-23 1946-08-27 Bendix Aviat Corp Fluid transmission
US2442783A (en) * 1944-07-01 1948-06-08 Us Sec War Turbine rotor
US3044557A (en) * 1959-01-08 1962-07-17 American Metal Prod Variable pitch fan blade

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191669A (en) * 1922-05-24 1923-01-18 Edwin Lawrance Walker Improvements in or relating to screw propellers with flexible blades
US1526657A (en) * 1923-08-24 1925-02-17 Bea Henry Flying machine
US2032224A (en) * 1933-02-01 1936-02-25 Packard Motor Car Co Fan
US2149267A (en) * 1936-04-02 1939-03-07 Gen Motors Corp Fan
US2406499A (en) * 1943-08-23 1946-08-27 Bendix Aviat Corp Fluid transmission
US2442783A (en) * 1944-07-01 1948-06-08 Us Sec War Turbine rotor
US3044557A (en) * 1959-01-08 1962-07-17 American Metal Prod Variable pitch fan blade

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3356154A (en) * 1966-11-16 1967-12-05 Ford Motor Co Flexible blade engine cooling fan
US3406760A (en) * 1967-09-18 1968-10-22 Wallace Murray Corp Flexible blade fan
US3594098A (en) * 1969-02-28 1971-07-20 Fram Corp Fan with weighted flexible blades
US3639079A (en) * 1970-03-12 1972-02-01 Fram Corp Flexible-bladed fan with improved reinforcing cap
US3639078A (en) * 1970-11-04 1972-02-01 Shrinivas V Pratinidhi Flexible-bladed fan with extended blade structure
US3679321A (en) * 1971-04-26 1972-07-25 Fran Corp Prestressed flexible bladed fan
US3773435A (en) * 1971-07-23 1973-11-20 Brookside Corp Flexible blade fan
US3785748A (en) * 1972-02-03 1974-01-15 Hayes Albion Reinforced automotive fan
US3836284A (en) * 1972-03-10 1974-09-17 Fram Corp Controlled deflection flexible bladed fan
US3799697A (en) * 1972-11-29 1974-03-26 Fram Corp Flexible bladed fan with tab connected reinforcing member
US3860362A (en) * 1973-12-14 1975-01-14 Ford Motor Co Flexible bladed fan
US3910718A (en) * 1974-03-18 1975-10-07 Fram Corp Limited deflection flexible bladed fan for use with viscous shear clutch
US4187055A (en) * 1978-04-03 1980-02-05 Vernco Corporation Flexible fan
US20210402118A1 (en) * 2018-10-05 2021-12-30 Tecnicas Biomedicas Para La Salud, S.L. Driving device for providing assisted ventilation

Also Published As

Publication number Publication date
DE1628420B2 (de) 1972-12-07
SE312395B (mo) 1969-07-14
DE1628420A1 (de) 1971-09-16
GB1105865A (en) 1968-03-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: HOUSEHOLD MANUFACTURING, INC.,

Free format text: CHANGE OF NAME;ASSIGNOR:WALLACE MURRAY CORPORATION;REEL/FRAME:004169/0175

Effective date: 19830809