CA1067871A - Sheet metal fan assembly - Google Patents
Sheet metal fan assemblyInfo
- Publication number
- CA1067871A CA1067871A CA269,533A CA269533A CA1067871A CA 1067871 A CA1067871 A CA 1067871A CA 269533 A CA269533 A CA 269533A CA 1067871 A CA1067871 A CA 1067871A
- Authority
- CA
- Canada
- Prior art keywords
- blade
- sheet metal
- radially
- fan assembly
- fan
- 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
Links
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A sheet metal fan exhibiting special utility as a radiator fan for an internal combustion engine. A
spider carries the blades on its arms, the arms each hav-ing a radially extending stiffening rib in opposed rela-tion to a complementary rib in its blade to thereby form a tube where the stiffening ribs are radially coextensive.
The stiffening rib on each blade intersects a continuous, blade stiffening channel.
A sheet metal fan exhibiting special utility as a radiator fan for an internal combustion engine. A
spider carries the blades on its arms, the arms each hav-ing a radially extending stiffening rib in opposed rela-tion to a complementary rib in its blade to thereby form a tube where the stiffening ribs are radially coextensive.
The stiffening rib on each blade intersects a continuous, blade stiffening channel.
Description
~L106'7~7~L
This invention relates to a sheet ~.etal fan assembly of the type particularly adapted for use with the cooling system of an internal combustion engine mounted in an automotive vehicle. A typical example of the utility o-f the fan assembly of this invention is between the radiator and the engine of an automotive vehicle. The fan draws air from ambience through the radiator thereby to assist in cooling the liquid which has transferred heat from the interior of the engine to the radiator. Such fans are well known, exist in a wide variety of forms and have enjoyed the attention of numerous workers in this art.
One common form of such a fan construction is -defined by a sheet metal hub or spider having arms pro-jecting radially outwardly, Each arm carries an associat-` 15 ed bIade t~hich may be attached as by ~elding, riveting, or the like. Either the blade or the attaching arm or both ma~ be twisted so as to vary the pitch of the fan. The spider hub is attached to a pulley or other rotary member which is powered by the engine. Examples of such prior -20 art sheet metal fan constructions are given by the follow-; ing patents: U.S. 295,449, issued to S~ith; 1,041,~13 issued to Tyson; 1,117,103, issued to Steinbach; 1,255,346, issued to Sparks; 1,404,298, issued to Jacobs; 1,597,175, issued to Boening; 1,868,528, issued to Gardner, 2,681,708, issued to Mix; 2,906,349, issued to Eans, 3,147,811, issued to Klonoski; 3,147,958, issued to ~ti~ler; 3,8~7,842, issued to Pope; British Patent No. 417,232; German Patent No. 762,625; and British Patent No. 908,586. It will be understood that these patents do not necessarily define all of the pri.or art.
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This invention relates to a sheet ~.etal fan assembly of the type particularly adapted for use with the cooling system of an internal combustion engine mounted in an automotive vehicle. A typical example of the utility o-f the fan assembly of this invention is between the radiator and the engine of an automotive vehicle. The fan draws air from ambience through the radiator thereby to assist in cooling the liquid which has transferred heat from the interior of the engine to the radiator. Such fans are well known, exist in a wide variety of forms and have enjoyed the attention of numerous workers in this art.
One common form of such a fan construction is -defined by a sheet metal hub or spider having arms pro-jecting radially outwardly, Each arm carries an associat-` 15 ed bIade t~hich may be attached as by ~elding, riveting, or the like. Either the blade or the attaching arm or both ma~ be twisted so as to vary the pitch of the fan. The spider hub is attached to a pulley or other rotary member which is powered by the engine. Examples of such prior -20 art sheet metal fan constructions are given by the follow-; ing patents: U.S. 295,449, issued to S~ith; 1,041,~13 issued to Tyson; 1,117,103, issued to Steinbach; 1,255,346, issued to Sparks; 1,404,298, issued to Jacobs; 1,597,175, issued to Boening; 1,868,528, issued to Gardner, 2,681,708, issued to Mix; 2,906,349, issued to Eans, 3,147,811, issued to Klonoski; 3,147,958, issued to ~ti~ler; 3,8~7,842, issued to Pope; British Patent No. 417,232; German Patent No. 762,625; and British Patent No. 908,586. It will be understood that these patents do not necessarily define all of the pri.or art.
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According to the practice o~ this invention, a fan assembly is constructed wherein each blade is bent outwardly from the plane of rotation of the fan assembly so as to assist in outward radial flow. Such radial out-ward flow reduces the exhaust space required directly behind the fan. The fan assembly o~ this invention em-ploys reinforcing rib elements in relatively thin steel blades. The ribs add strength to the blade and thereby permit metal of lesser thic~ness and weight. Further the fan assembly includes a sheet metal hub having a plurality of radially extending spider arms each provided with a sheet metal fan blade, the improvement comprising, a radially extending rib on each arm thereof and extending outwardly from the surface of the arm, each blade pro-vided at its radially inner portion with a rib extending radially along the blade and projecting outwardly from ; the surface of the blade, each blade being rigidly attached to an associated spider arm with the said rib on the blade and the said rib on the spider arm being in registered 2~ relationship, the tip of each blade being curved away from the remainder of the blade, thereb~ to induce radially outward flow of air, the tips defining the widest part of the projected width of the fan assembly.
IN THE DRAWINGS:
Figure 1 is a plan view o~ a typical sheet metal fan blade construction according to the practice of this invention.
Figure 2 is a view taken along section 2-2 of Figure 1.
Figure 3 is an enlarged view of a typical fan blade and spider arm of Figure 1.
~ 6'~
According to the practice o~ this invention, a fan assembly is constructed wherein each blade is bent outwardly from the plane of rotation of the fan assembly so as to assist in outward radial flow. Such radial out-ward flow reduces the exhaust space required directly behind the fan. The fan assembly o~ this invention em-ploys reinforcing rib elements in relatively thin steel blades. The ribs add strength to the blade and thereby permit metal of lesser thic~ness and weight. Further the fan assembly includes a sheet metal hub having a plurality of radially extending spider arms each provided with a sheet metal fan blade, the improvement comprising, a radially extending rib on each arm thereof and extending outwardly from the surface of the arm, each blade pro-vided at its radially inner portion with a rib extending radially along the blade and projecting outwardly from ; the surface of the blade, each blade being rigidly attached to an associated spider arm with the said rib on the blade and the said rib on the spider arm being in registered 2~ relationship, the tip of each blade being curved away from the remainder of the blade, thereb~ to induce radially outward flow of air, the tips defining the widest part of the projected width of the fan assembly.
IN THE DRAWINGS:
Figure 1 is a plan view o~ a typical sheet metal fan blade construction according to the practice of this invention.
Figure 2 is a view taken along section 2-2 of Figure 1.
Figure 3 is an enlarged view of a typical fan blade and spider arm of Figure 1.
3-~ ~671~
Fig-ure 4 is a section taken along section ~ine
Fig-ure 4 is a section taken along section ~ine
4-4 of Fig. 3.
Figure 5 is a section taken alollg section line
Figure 5 is a section taken alollg section line
5-5 o~ ~`ig. 3.
Figure 6 is a radial section taken along section line 6-6 of Fig. 3.
Referrin~ now to the drawings, the numeral 10 denotes generally the sheet metal fan assembly of this invention and is defined by a sheet metal hub 12 having a plurality o~ angularly spaced arms 14. The hub 12 is sometimes referred to as a spider and the arms as spider arms. The numeral 16 denotes a typical fan blade accord-ing to -this construction, the radially outermost portion 18 of the blade being curved away from the remainder of ` 15 the bladeO Each blade is in the general form of a part-cylinder surface, with the bent portion 18 e~tending along ~he entire width of the blade and away ~rom the general pla~ne of the blade. The numer~l 2~ denotes one leg of a ~ reinforcing channel (rib) while the numeral 22 denotes a similar channel. The two channels 20 and 22 are of generally U-shaped and merge with each other and with the radial rib 30 in the channel portion 24, ~orming a branch-ed rib configuration of generally Y-shape. The rib 30 extends from the radially innermost portion of each blade 16 and interseets the radially innermost portion of the closed loop. Both the reinforcing ch~nnel 20, 22, 24 and the reinforcing rib 30 bulge outwardly flola the for~ard side of the blade, both the reinforcing ril~ 30 and the reinfGrcing channel being of the same depth.
The numer~l 32 denotes rivets employed to fasten ~L0~787~
each bladc 16 to its associated spider arm 14. One of the rivets is inside of the branched reinforcing charnel, while the other t~o ar~ outside of it, one lying on one side of the reinforcing rib 30 and the other on the o~her side of the reinforcing rib 30.
The spider or hub 12 is provided with a side wall 40 joilling the inner portion 41 with the maxginal flange 46. As will be seen from Figures 3 and 4, each arm 14 presents a forwardly facing mounting pad surface 45 which is displaced radially outwardly from the hub 12 and is of generally triangular shape. This mounting pad sur-face is flat and is twisted from the plane of the marginal flange 46 but merges smoothly therewith as indicated at 46'. The inner end of each blade similarly is provided with a flat, generally triangular area 47 whose rear face is secure'ly affixed against the mounting pad surface 45.
Each arm 14 is provided with a channel or trough 44 which interrupts the wall 40 as show~ in Figure 3 and t'hereby merges smoothly with the forward surface of the inner portion 41 of the hub, extending radially there-From into the mounting pad surface 45 to terminate short of the area of the outermost rivet, as sho~n in brvken lines in Figure 2. The trough or channel 44 bulges reartl~ardly :from the arm 14 and defines the radially extending reinlnrcing rib 44'. The two ribs 44' and 30 are registered to :~orm a tube-like reinforcing structure as is ill.ustrated in Figures 5 and 6.
The surface of the fan hlade 16 in the reginn of the rivets 32 is ~'lat, as is the surface of the arm 14, except for the reinforcing rib 30 and the reill~orcing rib ~0~78'7~
44'. The radially outermost portion of the spider 12 ~ terminates in a flange denoted by the nllmeral 4ff. As may ; be observed particularly from Fig. 2, the spider arms 14 ; are twisted relative to the plane of the spider hub 12 to define the pitch of the blades.
The reader will note that an imaginary line ; drawn from the outermost rivet 32 inside the reinforcing channel to either of the other two rivets intersects orthogonally the channel portion 24.
A typical sheet metal fan blade failure occurs under the action of the first mode of resonance of the spider arm. Bending will typically occur about the attach ment points defined by rivets 32. In the present con-~ struction, bending of fan blade 16 (see Fig. 3) about an imaginary axis from the inner rivet 32 to either of the two outer rivets 32 will be at right angles to the rein-forcing channel portion 24 and accordingly the blade 16 of this invention will be better able -to resist failure he- ;
cause of this geometrical rela$ionship. The reader will ~0 also observe that one of the strongest structural shape~s is a triangle and is the general relationship o~ the reinforcing ribs 20, 22, 24. That is to say, one of the sides 20, 22, 24 is not easily distorted while leaving the other two sides free from di~tortion. The reader will also observe that the rib 30 at the radiall~ innermost por-tion of each fan blade 16 gives con~inuity and radial stiffness relaJcive ~o the spider hub 3~ tbe rlb 44' arld the rib 30 opposin~ each other to yielcl sueh COntlllUj.ty.
It will be observed partic~llarly fror,l Fig. 2 of the draw-ings that the hub 12 is in the general form of a dish.
~0~ 3'71 This results in a forward offset all~ permits c:enter pierc-ing or rearward offset of the blade with a minimal dimen--sion required between the mounting surf'ace and the rear of the assembly. A typical fall blade assembly fashioned in accordance with this invention employs a rein~orcing channel 20, 22~ 24 and reinforcing rib 30 of approximately 5/16 inch width at approximately 0.30 inches deep. l'ypi-cal prior art reinforcing channels in ribs have employed ; depths of the order of 0.120 inches. This relatively high ratio between the depth of the channels or ribs and their width permits the use of thinner metal for the fan hlades.
Another advantage displayed by this construction is the greater radial air flow caused by the tip of each blade being bent towards the suction side of the fan assembly.
Another advantage displayed by this construction is the greater ra~ial air flow caused by the tip of each blade being bent towards the suction side o~ the fan assembly, i.e., towards the radiator. As noted, greater radial air flo~r improves the cooling efficiency of a fan assembly~
In Fig. 2 J the bend of each tip is toward the right, the tips extending beyond the projected width of the f'an assembly. The projected width of a fan assembly i~ i~s width as viewed at right angles to the axis of ro-tation of the fan assembly. The nunleral 19 designates the extension of the blade tips be~oncl the projected width of the r~mainder of the fan, the latter denoted as P.~.
The fan blade tips thus define the widest: part of the pro-jected width of the fan assclllbly.
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The rear face of the inner portion 41 of the hub serves to mount the fan assembly to a member (not shown? driven by the engine. Often, the space T between the radiator and the engine block, represented respectively by the lines R and B in Fig. 2, is quite restricted and the space allotted for the fan assembly correspondingly has little depth. Because the engine block is close to and immediately behind the fan blades, the air exhausted by the fan tends to impinge directly upon the engine block. This not only restricts the flow of air but also causes the fan to consume needless power. Consequently, fan blades of this type utilize forwardly bent tip por-tions in order to induce a radial, outward dischaxge flow of air and thus decrease the mass flow of air impinging against the engine block. In customary practice, the orwardly bent fan blade tips are cut away generally along a line such as that indicated at 48 in Fig. 2 and the twist of the blade is adjusted so that the projected width of the blade is e~ual to the distance W. ~Iowever, by allowing the bent tip to protrude forward (towards the radiator) as shown in Fig. 2, such that the projected width at the tip is given by the distance "W", a lower consumption of fan power results while still obtaining the re~uisite flow of air through the radiator.
Figure 6 is a radial section taken along section line 6-6 of Fig. 3.
Referrin~ now to the drawings, the numeral 10 denotes generally the sheet metal fan assembly of this invention and is defined by a sheet metal hub 12 having a plurality o~ angularly spaced arms 14. The hub 12 is sometimes referred to as a spider and the arms as spider arms. The numeral 16 denotes a typical fan blade accord-ing to -this construction, the radially outermost portion 18 of the blade being curved away from the remainder of ` 15 the bladeO Each blade is in the general form of a part-cylinder surface, with the bent portion 18 e~tending along ~he entire width of the blade and away ~rom the general pla~ne of the blade. The numer~l 2~ denotes one leg of a ~ reinforcing channel (rib) while the numeral 22 denotes a similar channel. The two channels 20 and 22 are of generally U-shaped and merge with each other and with the radial rib 30 in the channel portion 24, ~orming a branch-ed rib configuration of generally Y-shape. The rib 30 extends from the radially innermost portion of each blade 16 and interseets the radially innermost portion of the closed loop. Both the reinforcing ch~nnel 20, 22, 24 and the reinforcing rib 30 bulge outwardly flola the for~ard side of the blade, both the reinforcing ril~ 30 and the reinfGrcing channel being of the same depth.
The numer~l 32 denotes rivets employed to fasten ~L0~787~
each bladc 16 to its associated spider arm 14. One of the rivets is inside of the branched reinforcing charnel, while the other t~o ar~ outside of it, one lying on one side of the reinforcing rib 30 and the other on the o~her side of the reinforcing rib 30.
The spider or hub 12 is provided with a side wall 40 joilling the inner portion 41 with the maxginal flange 46. As will be seen from Figures 3 and 4, each arm 14 presents a forwardly facing mounting pad surface 45 which is displaced radially outwardly from the hub 12 and is of generally triangular shape. This mounting pad sur-face is flat and is twisted from the plane of the marginal flange 46 but merges smoothly therewith as indicated at 46'. The inner end of each blade similarly is provided with a flat, generally triangular area 47 whose rear face is secure'ly affixed against the mounting pad surface 45.
Each arm 14 is provided with a channel or trough 44 which interrupts the wall 40 as show~ in Figure 3 and t'hereby merges smoothly with the forward surface of the inner portion 41 of the hub, extending radially there-From into the mounting pad surface 45 to terminate short of the area of the outermost rivet, as sho~n in brvken lines in Figure 2. The trough or channel 44 bulges reartl~ardly :from the arm 14 and defines the radially extending reinlnrcing rib 44'. The two ribs 44' and 30 are registered to :~orm a tube-like reinforcing structure as is ill.ustrated in Figures 5 and 6.
The surface of the fan hlade 16 in the reginn of the rivets 32 is ~'lat, as is the surface of the arm 14, except for the reinforcing rib 30 and the reill~orcing rib ~0~78'7~
44'. The radially outermost portion of the spider 12 ~ terminates in a flange denoted by the nllmeral 4ff. As may ; be observed particularly from Fig. 2, the spider arms 14 ; are twisted relative to the plane of the spider hub 12 to define the pitch of the blades.
The reader will note that an imaginary line ; drawn from the outermost rivet 32 inside the reinforcing channel to either of the other two rivets intersects orthogonally the channel portion 24.
A typical sheet metal fan blade failure occurs under the action of the first mode of resonance of the spider arm. Bending will typically occur about the attach ment points defined by rivets 32. In the present con-~ struction, bending of fan blade 16 (see Fig. 3) about an imaginary axis from the inner rivet 32 to either of the two outer rivets 32 will be at right angles to the rein-forcing channel portion 24 and accordingly the blade 16 of this invention will be better able -to resist failure he- ;
cause of this geometrical rela$ionship. The reader will ~0 also observe that one of the strongest structural shape~s is a triangle and is the general relationship o~ the reinforcing ribs 20, 22, 24. That is to say, one of the sides 20, 22, 24 is not easily distorted while leaving the other two sides free from di~tortion. The reader will also observe that the rib 30 at the radiall~ innermost por-tion of each fan blade 16 gives con~inuity and radial stiffness relaJcive ~o the spider hub 3~ tbe rlb 44' arld the rib 30 opposin~ each other to yielcl sueh COntlllUj.ty.
It will be observed partic~llarly fror,l Fig. 2 of the draw-ings that the hub 12 is in the general form of a dish.
~0~ 3'71 This results in a forward offset all~ permits c:enter pierc-ing or rearward offset of the blade with a minimal dimen--sion required between the mounting surf'ace and the rear of the assembly. A typical fall blade assembly fashioned in accordance with this invention employs a rein~orcing channel 20, 22~ 24 and reinforcing rib 30 of approximately 5/16 inch width at approximately 0.30 inches deep. l'ypi-cal prior art reinforcing channels in ribs have employed ; depths of the order of 0.120 inches. This relatively high ratio between the depth of the channels or ribs and their width permits the use of thinner metal for the fan hlades.
Another advantage displayed by this construction is the greater radial air flow caused by the tip of each blade being bent towards the suction side of the fan assembly.
Another advantage displayed by this construction is the greater ra~ial air flow caused by the tip of each blade being bent towards the suction side o~ the fan assembly, i.e., towards the radiator. As noted, greater radial air flo~r improves the cooling efficiency of a fan assembly~
In Fig. 2 J the bend of each tip is toward the right, the tips extending beyond the projected width of the f'an assembly. The projected width of a fan assembly i~ i~s width as viewed at right angles to the axis of ro-tation of the fan assembly. The nunleral 19 designates the extension of the blade tips be~oncl the projected width of the r~mainder of the fan, the latter denoted as P.~.
The fan blade tips thus define the widest: part of the pro-jected width of the fan assclllbly.
~G'7~3'7~
The rear face of the inner portion 41 of the hub serves to mount the fan assembly to a member (not shown? driven by the engine. Often, the space T between the radiator and the engine block, represented respectively by the lines R and B in Fig. 2, is quite restricted and the space allotted for the fan assembly correspondingly has little depth. Because the engine block is close to and immediately behind the fan blades, the air exhausted by the fan tends to impinge directly upon the engine block. This not only restricts the flow of air but also causes the fan to consume needless power. Consequently, fan blades of this type utilize forwardly bent tip por-tions in order to induce a radial, outward dischaxge flow of air and thus decrease the mass flow of air impinging against the engine block. In customary practice, the orwardly bent fan blade tips are cut away generally along a line such as that indicated at 48 in Fig. 2 and the twist of the blade is adjusted so that the projected width of the blade is e~ual to the distance W. ~Iowever, by allowing the bent tip to protrude forward (towards the radiator) as shown in Fig. 2, such that the projected width at the tip is given by the distance "W", a lower consumption of fan power results while still obtaining the re~uisite flow of air through the radiator.
Claims (7)
1. A sheet metal fan assembly including a sheet metal hub having a plurality of radially extending spider arms each provided with a sheet metal fan blade, the improvement comprising, a radially extending rib on each arm thereof and extending outwardly from the surface of the arms each blade provided at its radially inner portion with a rib extending radially along the blade and projecting outwardly from the surface of the blade each blade being rigidly attached to an associated spider arm with the said rib on the blade and the said rib on the spider arm being in registered relationship and projecting in opposite directions away from each other, the tip of each blade being bent away from the remainder of the blade in an axially forwardly directed direction thereby to induce radially outward flow of air, the tips defining the widest part of the projected width of the fan assembly.
2. A sheet metal fan assembly comprising, in combination:
a sheet metal hub comprising a central por-tion and a plurality of arms integral with and projecting radially from said central portion, each arm presenting a forwardly facing mounting pad surface spaced radially outwardly from said central portion and said central portion having a marginal flange having a forwardly facing surface merging with said mounting pad surface, each mounting pad surface being twisted out of the plane of said marginal flange;
a sheet metal fan blade for each arm, each fan blade having an inner end portion overlapping a corresponding mounting pad surface and being securely fixed thereafgainst, whereby each fan blade likewise is twisted out of the plane of said marginal flange, and each fan blade including an outer end projecting radially outwardly beyond its corresponding mounting pad surface and terminating in an axially forwardly bent tip por-tion;
said central portion of the hub including an inner portion offset rearwardly from but parallel to said marginal flange and presenting a mounting surface on its rear face for connection to an engine-driven drive member and a side wall joining said inner portion with said marginal flange, and each arm having a radially extending trough therein interrupting said side wall and merging smoothly with said inner portion of the hub and extending radially outwardly into the area of said mounting pad surface, said trough defining a reinforcing rib bulging outwardly from the rearward side of its arm;
each blade having a radially extending trough therein extending outwardly from the inner end of the blade in registry with the reinforcing rib of its corres-ponding arm, said trough in the blade defining a rein-forcing rib bulging outwardly from the forward side of the blade, the tip of each blade being curved away from the remainder of the blade, thereby to induce radially outward flow of air, the tips defining the widest part of the projected width of the fan assembly.
a sheet metal hub comprising a central por-tion and a plurality of arms integral with and projecting radially from said central portion, each arm presenting a forwardly facing mounting pad surface spaced radially outwardly from said central portion and said central portion having a marginal flange having a forwardly facing surface merging with said mounting pad surface, each mounting pad surface being twisted out of the plane of said marginal flange;
a sheet metal fan blade for each arm, each fan blade having an inner end portion overlapping a corresponding mounting pad surface and being securely fixed thereafgainst, whereby each fan blade likewise is twisted out of the plane of said marginal flange, and each fan blade including an outer end projecting radially outwardly beyond its corresponding mounting pad surface and terminating in an axially forwardly bent tip por-tion;
said central portion of the hub including an inner portion offset rearwardly from but parallel to said marginal flange and presenting a mounting surface on its rear face for connection to an engine-driven drive member and a side wall joining said inner portion with said marginal flange, and each arm having a radially extending trough therein interrupting said side wall and merging smoothly with said inner portion of the hub and extending radially outwardly into the area of said mounting pad surface, said trough defining a reinforcing rib bulging outwardly from the rearward side of its arm;
each blade having a radially extending trough therein extending outwardly from the inner end of the blade in registry with the reinforcing rib of its corres-ponding arm, said trough in the blade defining a rein-forcing rib bulging outwardly from the forward side of the blade, the tip of each blade being curved away from the remainder of the blade, thereby to induce radially outward flow of air, the tips defining the widest part of the projected width of the fan assembly.
3. A sheet metal fan assembly as defined in claim 2 wherein said mounting pad surface is flat and of generally triangular configuration, each blade also having a mating generally triangular flat area on its inner end portion.
4. A sheet metal fan assembly as defined in claim 3 wherein each fan blade is of generally rectan-gular plan view, the amount by which each blade is twisted out of the plane of said marginal flange of the hub and the amount of forwarding bending of the tip of each blade being such that the width of the blade as projected onto a plane normal to the plane of said marginal flange of the hub is widest at said forwardly bent tip of each blade.
5. A sheet metal fan assembly as defined in claim 2 wherein each blade is further provided with a generally U-shaped trough merging with the radially extending trough of the blade and forming with the radially extending trough a branched trough configuration of generally Y-shape, the generally U-shaped trough defining reinforcing rib arms bulging forwardly from the fan blade and branching from the radial rib to merge into the fan blade body radially beyond said mounting pad portion of its corresponding arm.
6. A sheet metal fan assembly as defined in claim 1 wherein said fan assembly is operatively asso-ciated with a radiator for directing air therethrough, and said bent tip being bent towards said radiator.
7. A sheet metal assembly as defined in claim 2 wherein said fan assembly is operatively associated with a radiator for directing air there-through, and said bent tip being bent towards said radiator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA269,533A CA1067871A (en) | 1977-01-12 | 1977-01-12 | Sheet metal fan assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA269,533A CA1067871A (en) | 1977-01-12 | 1977-01-12 | Sheet metal fan assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1067871A true CA1067871A (en) | 1979-12-11 |
Family
ID=4107713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA269,533A Expired CA1067871A (en) | 1977-01-12 | 1977-01-12 | Sheet metal fan assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1067871A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486094A (en) * | 1995-02-09 | 1996-01-23 | Davoil, Inc. | Ceiling fan blade mounting bracket and support arms providing two fan blade support points |
| US6712584B2 (en) | 2000-04-21 | 2004-03-30 | Revcor, Inc. | Fan blade |
| US6814545B2 (en) | 2000-04-21 | 2004-11-09 | Revcor, Inc. | Fan blade |
| US6942457B2 (en) | 2002-11-27 | 2005-09-13 | Revcor, Inc. | Fan assembly and method |
-
1977
- 1977-01-12 CA CA269,533A patent/CA1067871A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5486094A (en) * | 1995-02-09 | 1996-01-23 | Davoil, Inc. | Ceiling fan blade mounting bracket and support arms providing two fan blade support points |
| US6712584B2 (en) | 2000-04-21 | 2004-03-30 | Revcor, Inc. | Fan blade |
| US6814545B2 (en) | 2000-04-21 | 2004-11-09 | Revcor, Inc. | Fan blade |
| US6942457B2 (en) | 2002-11-27 | 2005-09-13 | Revcor, Inc. | Fan assembly and method |
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