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Патент USA US2107136

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Feb. 1, 1938.
L. ZAIGER
2,107,136
FAN
Filed Sept. 25, 1937
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Patented Feb. '1. 1938
2,107,136> ,
nutren) srnrns .PATENT cri-’ice
2,107,136
FAN
Y
Louie Zeiger, lLynn, Masa.
Application September b5, 1937, Serial No. 165,729
` e claims.
(El. 230-26l)
This invention relates to fans and it has i’or
pitch. This may be done conveniently by means
‘ oi a suitable die.
one of its objects to provide a fan of'novel con
struction wherein the outer peripheral marginal
In the drawings, I indicates a fan element em
bodying my invention. The fany element shown
is vformed -with four fan blades 2. Each fan 5
closing the blades of a fan in a guard member ' blade presents a core portion 3 of sheet metal
to prevent a person from becoming injured by which is provided with a rubber covering on both
sides as indicated at Il. This rubber covering not
contact with the rotating blades,
In my improved fan the blades are of suii‘icient only completely covers the core but extends for a
portion of the fan blades are made of soft ilexible
Ii material, thereby obviating the necessityof en
10> rigidity to hold their shape and pitch while in
operation, but the peripheral portion of the
blades is sumcientlyv soft so that a person will‘
not _be injured if he accidentally contacts the
rapidly rotating blades.
w
~
In' the drawings wherein I have shown a se-~
lected embodiment of my invention:
20
5 of the core as shown at 6 so that the peripheral
marginal portion of the `fan element is formed of
non-reinforced rubber and is relatively soft and
ñexible.
'
A further object of the invention is to provide.
.a novel way of making a fan having this construc
tion.
considerable distance beyond the peripheral edge 10_
`
Fig. l is a face view of the fan element with
a portion broken out;
.
One way of making my improved fan is to first l5
provide a core element 'I- which is shown in the
form of a disk of considerably smaller diameterv
than the diameter of the fan element and which
is also formed with radial slots 8 extending from
its periphery well toward its central portion. The 20
` core element is thus petaliform in shape and has
a petaled formation, it presenting a central por
tion 9 from which radiate thepetal sections or
sectors 3, one for each of the fan blades, each
petal section 3 forming the core of its' blade 2. 25
The central portion 9 of the core is shown as pro
vided with an opening I0 and also with a plurality
of apertures il, the purpose of which are to as
sist in correctly positioning the core element both
member molded into shape;
.
in the mold by which the rubber covering 4 is
l:lili Fig. 6 is a view on a small scale on- one mo
molded to the «core and in the die by which the
the rubber sheets used in forming the rubber cov
blades are given the required pitch angle. >If
ering for_the fan;
_
desired also, I may make each of the sectors il'
y Fig. 7 is an enlarged section on the line 'l-àl,
oi the core element with additional apertures I2.
Fig. l;
>
This core element 'I maybe readily stamped from
Fig. 8 is a plan view of one ot the dié mem-. sheet metal and when it is first made it is iiat
bers used for deforming the fan blades to give with the sectors all occupying the same plane.
them the required pitch;
_
, _ After the core element has been made then the
Fig. 9 is a side view of the die in partly open rubber covering 4 lis applied thereto in such a.
' 40 position and with the fan element in position to way as to form not only a rubber covering for 40
the sides of the sectors t but also so as to form
be acted on by the die;
» Fig. 2 is an edge view thereof;
Fig. 3 is a view of the core member;
Figs.' 4 and 5 are sectional views oi the mold
25 which is used in molding the rubber covering to
the core member, Fig. 4 showing the mold opened
with the rubber sheets and core member' in place
and Fig. 5 showing the mold closed and the f_an
Fig. 10 shows the die closed.
‘
the extendedperipheral portion 6 of rubber which
My improved fan element is formed with a. projectsy beyond the periphery of the core.
While this may be done in various ways I ßnd
plurality of blades, each of which has a metal core
itis convenient to accomplish it by placing the
4 which is covered. with rubber, therubber extend
ing beyond the peripheral edge of the core for“ fiat core between two sheets of rubber which are
a. considerable distance thereby to provide asoft larger than the core, and then subjecting the
ilexible peripheral marginal portion- for they blade. superposed rubber sheets and core to a molding
In thepreferred embodiment of my invention operation to mold the rubber to the core and to
cause the portions of the sheets beyond the pe»
50 the metal cores for all the blades of the fan are
» formed from a single/[petaliform piece of sheet riphery of the core to be Welded together. thereby
metal. The rubber ¿covering for the blades is to form the rubber portion 6 ofthe blade.
This operation is illustrated in Figs. 4 and 5
molded to the core member while it is ñat, and
after the molding operation is completed each which show a mold comprising two mold mem
55 blade is bent or deformed to give it the required bers I3 and Il. The mold member I3 is formed
4‘5
50
`
55
2
2,107,186
with mold cavities I5, one for each blade of the
fan, and with the central hub-forming cavity
I8. The other mold I4- is shown as having â
flat molding- face I1 and a central hub-forming
cavity I9. The mold I5 is shown as having
positioning pins I9 properly positioned to be re
ceived in the positioning apertures II of the core
member 1, and it is also shown as provided with
a center pin 20 which is somewhat smaller than
10 the central opening I 9 of the core member.
In forming the fan I propose first to place a
small piece of sheet rubber 2I in the mold mem
25
35
.
45
50'
55
60
the sectors of each die member being opposite
to the sectors of the other die member and the
faces of opposing sectors having the proper shape
to deform or twist the fan blades in order to
give them the required pitch. The deforming 10
sectors of the die member 22 are indicated at 22
and each deforming sector 22 is provided with
the operative inclined face 24.. 'I'he deforming
to superpose on this a larger sheet 22 of sheet
sectors of the die member 3| are indicated at 35
and each of these is provided with the operative
inclined face 25.
'
'I‘he die member 22 is provided with a central
spring-pressed plunger 21 which terminates at
It desired, however, the apertures 22. 24 in the . its upper end in a cup-shaped head 38 having an
sheets may be omitted and these sheets may be
interior shape to ilt the portion 29 of the hub 20
forced onto the pins I9 and 25, the latter being 49, said head 22 having positioning pins 40 ris
pointed for this purpose.
ing therefrom adapted to enter the apertures 28
The core member 1 is then placed in the mold
in the hub of the fan element and a center pin
on the rubber sheet 22 with Ithe positioning pins
4I of a size to fit the center aperture 21 of the
I9 occupying the positioning apertures II of the fan element. The plunger 21 is shown as acted 25
core member and with a central Ipin 29 project
on by a spring 42 which tends to hold it in its
ing through the central aperture III of thev core projected position and it is adapted to be forced
member. A second large sheet of rubber 25 is downwardly into the die member 22 against the
then placed on the core member, and, if desired, action of the spring 42 when the two members
a smaller piece of sheet rubber may be either are closed together, as shown in Fig. 10. A_ screw 30
interposed between the rubber sheet 25 and the.` or pin 42 carried by the die member 22 and hav
core member or placed on top of the sheet 25.- ing one end operating in a groove 44 in the
After these rubber sheets and core member have
plunger serves to limit the movement of the
been properly assembled as shown in Fig. fi, then plunger relative to the die. 'I'he die member 2I
the mold is closed as illustrated in Fig. 5. 'I‘his
is also provided with` a spring-pressed plunger 35
will mold the rubber sheets to the sectors 2 of 45 which terminates at its outer end in a cup
the core element 1 and will cause the rubber t6
shaped head 45 that is of a size to fit the portion
ilow into the hub-forming cavities I5 and I3 of 41 of the hub 49. This plunger- is acted on by
the mold members, thereby to form the hub por
abspring “which normally holds it in-the pro
tion I9 of the fan element. The rubber is also jected position shown in Fig. 9. f
40
forced through the apertures I2 of the sectors 2
In deforming the blades of the fan to give them
and through the central aperture I9 of the core the required pitch the fan element in its flat
member and around the positioning pins I9 and shape shown in Fig. 1 is placed in position be
the center pin 29. The pressure to which the tween ythe dies with the positioning pins _40 and 4I
rubber is subjected when the molds are closed occupying the apertures 29 and 21 in the hub 45
not only forces the vsurplus rubber into the hub
portion of the fan as seen in Fig. 9. .The two
forming cavities I9 and I4 to form the hub 49. die members are then closed together and during
but results in welding together the rubber sheets the initial closing movement the cup-shaped head
22, 25 where they meet beyond the periphery of 46 of the plunger 45 is brought against the por
each core sector 2, thereby forming the portions tion 41 of the hub of the fan element so that the 60
hub portion will be‘clamped between the cup
9 of the blades,
.
This molding operation is performed while ithe shaped heads 45 and 29. As the dies continue to
core member kin a nat condition and it results move together one sidey edge of each blade 3
in producing a fan element in which the blades engages the high portion of the corresponding
2 all occupy the same plane.
die sector 23 and the opposite side edge of the
When the fan element is removed from the blade is engaged by the high edge of the opposing
mold any surplus rubber which may have been die sector 25, and as the die members are closed
squeezed out through the joint between the mold together the blades of the fan are twisted or de
members is trimmed oi! thereby leaving the fanv formed as illustrated in Fig. 10 to give each blade
element in the condition shown in Fig. 1. In this the required pitch. During this operation the 60
condition the hub portion 49 thereof will be pro
sectors 3 of the core elements are twisted into the
-~ vided with a central opening 21 which is formed
-by the central. pin 29 and with other smaller
l openings 29 which are formed by the positioning
65
able for this purpose is illustrated in Figs. 8 to
10, and it consists of two die members 2I, 32.
Each die member is formed with a plurality of
deforming sectors, one for each blade of the fan,
ber I2 at the central portion thereof and then
rubber. .Both the sheet 2I,`if it is used, and the
larger sheet 22 may be provided with a central
aperture 22 to receive the pin 20 and with other
apertures 24 to receive the positioning pins I9.
20
give each blade the required pitch. A die suit
pins I9.
It desired.v thecentral portion 9 of the core
element may be formed with the annular rib 29
and each of the sectors 2 may be formed with
the radially extending rib 29, the purpose of
70 these ribs being to add strength and rigidity to
the core element. After the fan element has been
removed from the mold in a flat condition, as
shown in Fig. 1, it is then subjected to the action
of suitable dies which deform or twist the rubber
covered sectors 2 of the core element so as to
inclined positions determined by the-faces _34 and
35 of the opposing die sectors, and the rubber por
tion of the fan is distorted from its original fiat
shape. The deformed petal sections 2 of the 65
core serve to preserve the pitch angle which is’
thus given tothe blades by the die members, not
withstanding the tendency of the distorted rubber
portion of the fan to resume its initial shape.
While the shape of the blades 2 may vary some 70
what without departing from the invention, yet
the shape of the blade which’I prefer is sub
stantially like that herein illustrated in which the
dimension from the leading' edge to the trailing
edge -is at least as great as the dimension in a 75
3
2,107,186
_radial direction. This results in a fan element
which, when taken from the mold, has a petalated
formation. Furthermore, in the preferred em
bodiment of the invention the width dimension of
each petal section 3 of the core is such that said
petal section extends throughout the major por
tion of the blade in the direction of the width of
the blade. 'I'he radial dimension of each petal
section 3 of the core, however, has such relation
10 to the radial dimension of the corresponding blade
2 that a considerable portion of each blade is
riorly reinforced with a petaliform core member
of sheet metal, the outer radial portion of each
blade being free from any reinforcement and
being sufllciently soft and flexible to yield when it
engages an object and having the capacity to re 5
sume its normal shape when free from the object.
2. A fan element presenting a petallform core
portion of sheet metal and -rubber covering the
core member and extending radially considerably
beyond the-periphery of each of the petal sections
of thel core member, thereby providing a rubber
ln
located beyond the peripheral edge 5 of said petal _ fan in which each blade is interiorly reinforcedV
section as shown at t. As stated above, this unre
enforced portion t of each blade will- yield or
15 give when it strikes an object but it has the
capacity to resume its normal shape and radial
position as soon as it is .free from 'said object.
„ The blades, therefore, might be described as self
sustaining blades which are sumciently flexible to
20 yield when engaged by an object but which have
the capacity to resume their normal shape when
at its inner radial Aend and the outer radial por- `
tion of which is soft and iìexible;
3. A fan 'element having a petaliform- core
portion of sheet material and rubber enclosing
each petal section of the core portion toform the
blades of the fan and also enclosing the central
part of the core portion, said rubber having con- A,
siderable thickness at said central part of the
core thereby to form a rubber hub ,for the fan,
the rubber portion of each blade extending `radial
`free from said object.
ly `»considerably bey'ond the periphery of its petal
A fan element is thus produced which has rub
berv blades that are suñ‘lciently reinforced inte , section of the core to provide an outer radial por
lo Ul riorly at their inner ends where they join the tion for y,the blade which is suiiiciently fiexible to
hub portion of the fan to preserve the pitch which yield when it engages an object but which is
has been given to the blades by the die members, capable of resuming its normal shape when free
`
but the outer marginal portions of which are from. said object.
4. A fan element having a petaliform core .,
formed of non-reinforced rubber and are, there
fore, soft and flexible. The reinforced- portion of portion and rubber enclosing each petal section "
each blade preserves the ' pitch of the blade> of the core portion to form the` blades of the fan
throughout its extent but the outer peripheral and also enclosing the center of the core portion
half of the blade is formed from non-reinforced and forming a rubber hub for `the fan, the rubber
rubber. A fan element having this construction portion of each blade extending-radially consider
ably beyond the periphery of its petal section of
35 presents blades which are‘sufficiently rigid tov have
excellent air-movingA qualities but at the same the core to provide an outer radial portion for
time the outer peripheral portion of the fan is of the blade which is suiiiciently flexible to yield
soft flexible material which will not cause injury when it engages an object but which is capable of'
to a person _if he contacts with the fan when it is resuming its normal shape when free from said
40
rapidly rotating.
- object, said rubber hub portion of the fan element
Afan having my improved fan element can,
therefore, be safely used in any location Without
enclosing the rotating fan element in a guard as
. is usually done in the case of a fan having metal
having an axial shaft-receiving opening.
i
~5. A fan element comprising a hub and' blades
formed of rubber, the dimension of each blade
from the leading to the trailing edge being at
, blades. 'I'he central opening 27 in the hub of the least as great as the radial dimension thereof. ' '
fan provides a suitable opening to receive the end. and a petaliform core member of sheet material
of the fan shaft to which the fan element may embedded in and entirely enclosed by the-rubber
with a petal section of said core located at and
be applied, and in the case of a small fan such
as is used in _automobiles for circulating air -reenforcing the inner radial end only of each
blade, _the outer radial portion of each blade being 50 against the windshield a sufficient driving con
nection between the fan element and the fan shaft free from reenforcement and being self-sustain
can be provided by simply forcing the rubber hub
oi' the fan element onto the end of the shaft espe
cially if the shaft has a diameter slightly larger
than thatof the aperture 2li. Since the fan ele-y
`merit is initially made with a flat shape shown
in Fig. l and without any `pitch angle to the
blades, the deforrning of' the blades to give them
the required pitch angle distorts the rubber por
60 tion of each blade and, therefore, in the completed
fan the rubber portions of the blades are main
tained in their distorted condition by the petal
sections of the core member.
_
'
_ This application is a continuation in part of my
65 co-pending application, Serial No. 137,502, filed
April 1'?, 1937.
.I claim:
’
‘
1. A f_an element having a hub portion and a
- plurality of blades molded to shape from rubber,
ing but suñiciently flexible to yield when engaged
by an object and capable of resuming its normal
shape when free from said object.
6. A. fan element presenting a petaliform core
portion of sheet metal, the petal sections of which
have a pitch angle corresponding to the pitch
angle required in each blade of the fan and an
integral rubber portion which covers the core por
tion andrforms both a rubber hub for the fan and
the blades thereof, the rubber part of each blade
extending radially considerably beyond the pe
riphery of the petal section thereof and normally
having a 'less pitch angle than that of the corre
sponding petal section, the rubber portion of each 65
blade being held in distorted condition at said
required pitch angle of the blade by the corre
sponding petal section of the core, the outer
radial portion of each blade being sufficiently
70 lthe dimension of each blade from the 'leading to ì flexible to yield when it engages an object but
the trailing edge being at least as great 'as the being capable of resuming its normal shape when
,
radial dimension thereof, and the hub portion and free from said object.
the inner radial end only of each blade being inte
'
LOUIS ZAIGER.
DISCL AIMER
.2,1o7,136.--Loui@ zuiger, Lynn, Masè. FAN. Pate?t dated February 1, 1938.,
' Disclaimer ñled June 15, 1940, by the inventor.
Heréb enters this disclaimer to claimsv 2, 3, 4, and 6 in said specîñcation. .
_
‘
Gazette July 9,1940]
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