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Патент USA US2122631

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July 5, 1938.
J. R. ALBERS ET AL
'
2,122,631
PROPELLER SHAPING MACHINE
Filed oct. 2s, 1955
4/4
¿e
2 sheets-sheet 1
~July 5, 1938.
J. R. ALBERS Er AL
2,122,631
PROPELLER SHAPING MACHINE
Filed Oct. 28, 1955
2 Sheets-Sheet 2
Patented July 5, 1938
2,122,631r
UNITED STATES PATENT OFFICE
2,122,631
PROPELLER SHAPING MACHINE
John R. Albers, Sioux City, and Gerhard H.
Albers, Cherokee, Iowa, assìgnors to Win
charger Corporation, Sioux City, Iowa, a cor
poration cf Minnesota
Application October 28, 1935, vSerial No. 47,190
5 Claims.
Our invention relates to a machine for shap
ing wooden propellers.
An object of our invention is to provide a shap
ing machine which efficiently shapes the pro
5 peller blades without the necessity of hand shap
ing.
such a machine which will shape both the pitch
and the airfoil curve of the blade merely by feed
10 ing a blank strip of wood through the machine.
A further object of our invention is to provide
a machine of this type which will provide an
accurate pitch and airfoil curve to the blade at
all points along the surface thereof.
A fur-ther object of our. invention is to pro
vide such shaping means which will accurately
shape the blade -in spite of the gradual taper
from the ends thereof to the hub portion.
A further object of our invention is to provide
20 the above mentioned means in a machine of sim
ple construction which can .be manufactured at
a reasonable cost.
With these and other objects in view, our in
vention consists in the construction, arrange
25 ment and combination of the various parts of
our device, whereby the objects contemplated are
attained, as hereinafter more fully set forth,
pointed out in our claims, and illustrated in the
accompanying drawings, in which:
30
Figure 1 is a side elevation of the machine,
Figure 2 is a plan view of the same showing
the pitch cutter and the airfoil cutter,
Figure 3 is an enlarged sectional detail taken
35
along the lines 3--3 of Figure 2,
,
Figure 4 is an enlarged detail in section taken
along the lines 4--4 of Figure 2 and showing
the cutting operation in advanced position,
Figure 5 is a section taken generally along the
lines 5-5 of Figure 4,
40
,
Figure 6 is a similar section, except showing
the airfoil cutting blades,
Figure 7 is an enlarged detail' of the propel
lerl dropping mechanism,
Figure 9 is a plan view of the finished pro
peller.
The frameworks support the channel members
II, and it will be noted that there are two ma
chines, one for cutting the pitch, and the other
the airfoil. Both machines are practically iden- 10
tical, with the exception of the differences which
will be explained later, and therefore the de
scription will apply to both types, with, of course,
the exceptions noted. In Figure 2, it will be as
sumed that the lower machine is the one for cut- 15
ting the pitch. Amxed Within the channel H
are the two lengthened angle irons I2. In using
the machine, first .a fiat rectangular strip of wood
is cut out suitably with a band saw or by other
means to the shape as shown in Figure 9 which 20
is the flat surface shape of the finished propeller.
Approximately one-half of the length of the pro
peller, or from one tip to the center, is bolted
upon the platform member l5. The platform
member I3 is preferably made of wood, and in- 25
cludes the bevelled top I4, which bevel is the
same .as the pitch of the propeller. The flat
strip is indicated by the character I5 as shown
in Figure 3. Attached to the platform I3 is the
substantially cylindrical member I6 which re- 30
ceives the further shaft Il. The extremity of the
shaft I'I is> attached at one side to the square por
tion I8 and to the other end to the circular por
tion IS. ’I'he circular portion I9 extends into
the further square 2G which is integrally formed 35
therewith. The portion I9 (see Figure 7) ex
tends into the ear 2I and also into the trip lever
22 which is slightly offset as shown in Figure 3,
The trip lever 22 includes the bevelled ends 23
which terminate at a point as shown. To the 40Í
ear 2| is affixed one end of the tension spring 24,
the other end of which is añixed to the platform
I3 at 25.
Figure 8 is a further view of the same, and
45
Wooden blades would principally reside in pro
viding a correct airfoil curve regardless of the
tapering thickness of the blade. We shall also
show how we have accomplished this result.
We have used the character Il) to indicate gen- 5
erally the frameworks supporting the machine.
A further object of our invention is to provide
l5
(Cl. 1411-134)
`
The principal diiiiculties encountered in pro
peller shaping is that of attaining an accurate
curve and pitch. The' wooden propellers now
50 made by hand are susceptible to human error,
and it is our intention to show in our invention
that we have provided a machine which will ac
curately cut the sectional contour of the blades
with a minimum of time and effort. The dini
55 culties encountered in any machine for cutting
l
It will be noted that the square portion 2U
and also I8 are set off-center, which provides an 451:»
important feature in the machine. A further
strip 26, which is attached at 2l to the platform
I3, acts as a stop member tov limit the downward
movement of the trip lever 22. The forward end
of the platform I3 includes the further squared 59'.'
members 28 which are .attached at the end
thereof, and the end of the member I3 also in
cludes the keep-plate 29, which is attached
thereto and which includes the small point mem
bers 30.
2,122,631
The propeller shape, which has already been
cut out, is now placed upon the platform or car
riage I3, and the end is forced into the small
points 38 in the keep-plate 29 (see Figure 4).
The U shaped clamp 3I is then brought over
the strip I5 and is tightly clamped thereto by
means of the cam lever 36 which is adapted to
The spring 58 supports 'the plate 55 above the
surface of the work.
Figure 4 illustrates the use of the carriage with
the strip I5 attached thereto wherein the strip
is being pushed through the machine by the op
erator. As it travels, the blades are cutting at
a high rate of speed, and they cut the strip I5
bear against the projections 11` of which` there
are two, which projections are rigidly attached
10 to the carriage I3. The carriage I3, which is
along the surface 61 which is indicatedalso by
the-horizontal dotted line'in Figure 3: As the
carriage is forced through the machine, and by
now carrying the attached strip or blank4 forma virtue of the sloping face I4 of the carriage, it will
is then fed into the machine by sliding the 'baseenlespecially from Figure 3 that a certain
squared portions I8, 20, and the end square por
pitch thereby cut on the propeller blade, since
tions 28 along the angle irons I2'. As the strip` the member I5..is clamped upon the sloping sin‘
15 I5 is feci into the machine, it reaches the cut-v face of the-carriage',y and the pitch will be exactly
ting members which will now bedescribed.
the same-„as the slope‘ I4. Also since thel carriage
The cutting members on the pitch forming ' I3"is'high- at‘thev forward end, the thickness of
machine comprise the flat platesY 3.1 which are theeblade will-taper from the end gradually to a
rigidly attached to the square metal block 38 on larger thickness at the hub. As the carriage is
20 opposite sides thereof. The plates areattached
forcedl through the cutting blades, the trip lever »
by-` means .of the cap screws 38Ywhich are received
22„01‘» course', travels together with-= the- same.
within the slots 1li,V which slots are lengthened A pin 68 is secured inside ofthe vangle'memlcers;
fory adjusting the cutting depth of ther blades. 41~slightly above the center; line ofthe machine.
'I‘he plates 31 are bevelled at 4|-, The square When the lever 22. strikes. thepinf,Y (see Figures .'73`
25 blocks 33A extend into the integral shafts 4I)y which and 8), itis carried over, as shownfiniFigure. 8,
pass through suitable bearings 4I and 42= and the and since the square portions 2D and I8 are off-_-`
pulleysl 43 are attached thereto. A. semi-cylin
center, they will-riseto the position as- shown'in
35
dricalhousing Mis-attached abouty the cutting
members and is spaced therefromby means of
suitabl-e> spacers 45, and is secured by meansofthe further bolts 46, which bolts pass into the
enlarged anglev member 41 which extends a fair
ly substantialdistance above'the channel mem
is; so -situatedthat this» droppingîactionvoccurs asi °
ber II.
The blades are so adjusted that they will cut a
causes the strip I5,` toy clear the bladessothat the
hub portion is` left intact. to itsV desiredfthickness. -
suitablel depth in the member I5 to provide t -e
After one blade of the propeller is'cut,l it is re,
moved and then.thelother` blade-isl _clamped iny
the same-position, andthe operation-.is repeated,_
thereby‘providing` an oppositely pitchedslope on
proper thickness of the blade, and of course are
adjusted so thatthey both cut in the same circle,
which circle is indicate-d by the character 48'.y
The member I3 is tapered slightly, and the
square members .9.8l at the forward end of the
carriage I3 -support the platform I3 slightlyaboveV
the level` of the rear end so that the total resii «.
is` thatv the carriage I3 tapers» gradually down
l .,Wardly towards the rear thereof.
Figure 8, thereby causingthecarriage~I3fto drop;4
downwardly within the‘channelf I'I: The. pin: 68:
soon-- as the bladesapproach-the hubportion-of
the propellers'where,- of course„it is-znoty desired'
to cut. This dropping action thencccurs, which
each-blade, whichpitch-«willbe accurate from‘the
tip to thehub. Afterl the pitch is- cut,v the blade
is then ready for the next operation which takes
place -in- the airfoil cutter.
The airfoil cutterA is the upper machine asÍ
shown in Figure--2,_and is» identical in every re-y
spect withfthe pitch' cutter, withzthe'exception of I
Both machines are run by-means of the shaft 49»
which is-attached to the large pulley 50 and the theblades andfthe-slopefof-,the carriage: I3.v Af
other> pulley 5I. The shaft 49» is driven by means similar carriage I3 :isemployed vinthe airfoilgcut.
of .thebelt 52y which is suitably driven by means ter, with the exception ,that-the carriage I-3finthisr
¿off an-electric motor. er other means. The belt instance is rectangular throughout4 its cross-.sec
52.passes over the pulley 53, and surrounding yboth ticnand dOesnot'incIude the slope I4, but.V in
enlarged pulleys 50 and 5I are the further belts stead the upper surface is. horizontal. The car-y
5_4» which` pass> over the pulleys 43. It will be riage I3, , however,>> tapers . downwardly ; from" the
noted that the pulleys'43 are considerably smaller forward end to a more. pronounced-degree thanA in i.
than~therpulleys5l so that» avery high speed of the-pitch cutter», and-'which taper. is indicated i
rotation is imparted to the blade members 31.. by the-dotted lines 69:. Attachedto a- similar
The circle of rotationof the blades is clockwiser .block 38. are theY blades; 10 (~.'see_»l1?ig.ureI 6.)., into.'
as» shown in the drawings andv againstthe direc
which :bla-:les `are formedïthe- airfoil `:curve -1 I hav
tion .of motion of the carriageA I3. Achip breaker. ing a suitable bevel 12. Thev` curve 1I includes
is-providedwhich comprises the plate 55;.r (see. Fig
the smaller» arcuate portion- 13AY andthe length-.
ure 4') upon which rests a fairlyfheavy weight 5B
cned airfoil curve 14.
to `which, is~_attached at 51 thevtensionspring. 58,
at.,a1substa-ntial depth. corresponding-„1to1 orV great
er than the full thicknessfof’-thepropeller» blade;~,
Itlwill‘be seen from Figureô‘ that asfthe carriage
I3.~ travels` past. the'f cutting blades in theffsame (1)52.,
the other end of which is attached at 59,fto,the
casing 44. The edge` 60 ofithe plate 5.5'- is placed
.. so > that: it: just- clears the. rotating. bevelled points .
A
'I'l’lefcurve’` portion; 1,»3fis.
4I§of-` the plates 31, and the iunctionrof this plate» fashion as in the pitch cutter, that arstthe; '
is" to y prevent the breaking: off of large pieces`
thinnest portion» of « the i blade i will » pass: through
which lwould tend- tc> chip'oif from .the wood, since the cutters.> Atathis-point, only- part .ofthe curve>
itlis‘placedclosefto the surface, thereof and pre
13.»andrpa'rt ofthe curve-14~..will cutoff the-mate-V
vents@ such injuriousleiîects. The plate 55‘: is at.-v rial- fromi the blade. Through a the~ progressive` 7951.
tachedïv to the post 6J' whichaterminatesin the travel of4 the-carriager I3, however, the thicker
bearing. B2; which receives, the end B3f of the U` portions-off the: bladeI willscomeßnext- tofthez- cute e
shaped» _member B4^=which are inuturnattached to ting curvesV so, thaty as-,theblade varies @in - width.;kl
thegcasing; 44 at` S5. . The. -casings arescutiawayçat it. also-variesim thicknessyand it willi» be noted,>
65 so that the weight will be received therein... especially-_' from; the@ curvesy that; the,- curve.l will.
2,122,631
accuratelylffollo‘w` the :thicker portion as well as
the wid-er portion ofthe blades. ~ As shown in
Figure-6, .theibladei is in approximately its mid
position ,of:,«.cutting,-‘ and as thecarriage is :fed
into~the machine, the-shape `of blade- will1be cut
as shown bythe dotted lines 15,'so that an accu
3
nel, a carriage received within the channel,
means for attaching a blank wood strip to the
carriage, and means for cutting a propeller pitch
on said blank strip mounted on said channel in
cluding a horizontal cutting member mounted on
said channel, said carriage being sloped down
rate-„airfoihcurve- will be cut on the propeller,
regardless of its increase in thickness and width.
The same trip .lever `22, with its associated mech
10 anisrngisiemployedLin the airfoil cutter so that
the hub portion will again be released from the
wardly across its width on the upper surface
cutting blades in the same manner. lAfter the
airfoil is cut on one blade or one-half of the pro
riage below the level of said cutting blades when
above the hub portion of the propeller including
peller, it is removed, and the other end is clamped
to the carriage, and it is forced through the
a pair of opposed guide members, a rotatable
shaft attached at the inner end of said carriage, 15
extensions eccentrically mounted on said shaft
and received within the guide members, a trip
member attached to said shaft and to one of said
extensions, a pin attached inwardly of said chan
nel adapted to force said trip member pivotally 20
about said shaft to cause the shaft to drop during
forward movement of the carriage.
3. A pitch cutting machine comprising a chan
nel, a carriage received within the channel,
means for attaching a blank wood strip to the 25
carriage, and means for cutting a propeller pitch
on said blank strip including a horizontal cut
ting member mounted on said channel, said car
machine in the same manner.
l
The chip breaker plate in this instance is ex
actly similar to the other, with the exception
that the edge 60, instead of being straight, is
20 curved to approximately the same curve as the
curve 1| in the plate 10, so that the edge will per
form the same function in preventing the break
ing off of large pieces and will always be close to
the cutting edges.
25
It will be understood throughout the descrip
tion that besides explaining the mechanical ar
rangements for performing the operations, that
we have provided a process also for shaping pro
peller blades, which process utilizes the principle
30 of accurately curved blades rotating at a high
speed to cut the desired shapes.
It will now be seen that we have provided a
machine for shaping wooden propellers, which
shapes both the pitch and the airfoil curve of the
35 propeller, which provides an accurate pitch and
airfoil curve at all points regardless of thickness
o-r width, and which machine is of simple con
struction which can be manufactured at a very
reasonable cost.
40
Some changes may be made in the construc
tion and arrangement of the parts of our inven
tion without departing from the real spirit and
purpose of our invention, and it is our intention
to cover by our claims any modified forms of
45 structure or use of mechanical equivalents, which
may be reasonably included within their scope.
We claim as our invention:
l. An airfoil cutting machine comprising a
channel, a carriage received within the channel,
50 means for attaching a propeller blank to the
carriage, and means for cutting an airfoil curve
on said blank mounted on said channel including
a rotating block including an opposed pair of
blades attached thereto having cutting edges sub
55 stantially of the same contour as the airfoil curve
to be cut, said curve varying progressively along
its depth and width so as to cut an accurate
curve on said propeller regardless of the varying
thickness and width of the same, said carriage
60 sloping downwardly along its length on the upper
surface thereof to cause accurate cutting with re
spect to the tapering thickness of said propeller,
means for dropping said carriage below the level
of said cutting blades when above the hub por
65 tion of the propeller including a pair of opposed
guide members, a rotatable shaft attached at the
inner end of said carriage, extensions eccentrical
ly mounted on said shaft and received within the
guide members, a trip member attached to said
70 shaft and to one of said extensions, a pin at
tached inwardly of said channel adapted to
force said trip member pivotally about said shaft
to cause the shaft to drop during forward move
ment of the carriage.
76
2. A pitch cutting machine comprising a chan
thereof, said slope being the same as the pitch to
be cut, and said carriage being higher at its for
ward end to accommodate the tapering thickness
of a propeller blade, means for dropping said car
riage being sloped downwardly across its width
on the upper surface thereof, said slope being
-the same as the pitch to be cut, and said carriage
being higher at its forward end to accommodate
the tapering thickness of a propeller blade, means
for dropping said carriage below the level of said
cutting blades when above the hub portion of 35
the propeller including a pair of opposed guide
members, a rotatable shaft attached at the inner
.end of said carriage, extensions eccentrically
mounted on said shaft and received within the
guide members, means for rotating said exten 40
sions about said center to cause dropping of the
carriage during forward movement thereof.
4. A pitch cutting machine comprising a chan
nel, a carriage received within the channel,
means for attaching a blank wood strip to the 45
carriage, and means for cutting a propeller pitch
on said blank strip mounted on said channel in
cluding a horizontal cutting member mounted on
said channel, said carriage being sloped down
wardly across its width on the upper surface 50
thereof, said slope being the same as the pitch to
be cut, and said carriage being higher at its for
ward end to- accommodate the tapering thickness
of a propeller blade, means for dropping said car
riage below the level of said cutting blades when 55
above the hub portion of the propeller including
a pair of opposed guide members, a rotatable
shaft attached at the inner end of said carriage,
extensions eccentrically mounted on said shaft
and received within the guide members, means 60
for rotating said extensions about said center in
cluding a trip lever attached to the shaft, a pin
attached to said channel for rotating said lever
when forced thereagainst, to cause dropping of
the carriage during forward movement thereof. 65
5. An airfoil cutter comprising a channel, a
carriage received within the channel, means for
attaching a propeller blank to the carriage, and
means for cutting an airfoil curve on said blank
mounted on said channel including a horizontal
cutting member mounted on said channel having
cutting edges substantially of the same contour
as the airfoil curve to be cut, said curve varying
progressively along its depth and width so as to 75
4
2,1224631:
cubain-accurate curve‘onzsaid propeller regardf-
carriage;JV extensions; eccentri'calhrA 'v v mounted@ on
less of the varyingv thickness and width of: the
its length on theupper surfacesthereof; to cause
said# shaftk and. received: within:I the? guide-1 meme
bersf, means;y for` rotfa/oingf4 sauf, extensions f about
saidscenter `ineludingf a trip: lever: attached'` to. the
accurate cutting With.. respectv to; the. tapering
rthickness ofY said. propeller, means for dropping-
said' lever: wheny forced thereagainstf t'o« cause
same, said. carriagev sloping downwardly) along
saidscarriage'below the level of saidcuttingnblades
when above the hub portiony of the propeller in
cluding a pair of opposed guide members, a ro
flU tatable shaft attached'> at; the inner end-.of> said
shaft;- alpìn‘attached:1to.v said’channel-for rotating
dropping ofthe carriage during f'orwardl move
ment'- thereofí
JOHN'v R'. ALBERS;l
GERHARD?
10
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