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Патент USA US3032102

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May 1, 1952
R. w. ERLBACHER
3,032,092
PROPELLER STRAIGHTENING APPARATUS
Filed April 8, 1957
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3 Sheets-Sheet l
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KQBERT W. ERL sac HER,
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May 1, 1962
File d Aprl l 8, 1957
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R. w. ERLBACHER
3,032,092
3 Sheets-Sheet 2
May 1,-1962
R. w. ERLBACHER
3,032,092
PROPELLER'STRAIGHTENING APPARATUS
Filed April 8, 1957
3 Sheets-Sheet 5
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United States Patent 0 ice
3,932,092
Patented May 1, 1962
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1
61
relations and upon which there is supported a movable
overhead ram which is adjustable with respect to the pro
peller blade to be worked upon and which table has pro
visions for supporting a bottom rarn underneath the pro
peller blade to be worked upon and in various positions
3,632,092
PROPELLER STRAIGHTENING APPARATUS
Robert W. Erlbacher, 920 N. Fountain,
Cape Girardeau, Mo.
Filed Apr. 8, 1957, Ser. No. 651,332
16 Claims. (Cl. 153-?32)
of support.
Still a further object of this invention is to provide a
This invention relates to improvements in marine pro
device for supporting a propeller blade in various posi
peller straightening apparatus and in particular relates to
tions of tiltable adjustment upon a base by means of tilt
supporting means for tilting a propeller so that its blades 10 able ?ller blocks which support a work shaft passing
may be disposed for straightening by ram devices.
It has been a major problem in the marine industry in
the past to straighten the blades of damaged propellers.
through the propeller and the ?ller blocks and which ro
tation of the ?ller blocks with respect to one another
causes the desired tiltable adjustment of the propeller.
Damage to these blades may be through a number of
Yet a further object of this invention is to provide a
conditions such as striking underwater obstructions and 15 propeller straightening apparatus comprising a work table,
the like. When the blades are dented or otherwise dis~
a propeller supporting device, which provides for tiltable
torted out of their proper relationship, loss in e?iciency
support of the propeller, and hydraulic rams for working
and propulsion results. The alignment of the blades is
upon the propeller blade, which apparatus is simple in de
quite important in the marine industry for obtaining the
proper propulsion and any dents or bending of the pro
20
peller blade seriously detracts from the performance of
the propeller.
By means of the instant invention, there has been de
vised an operative apparatus for handling marine pro
pellers of up to several feet in diameter and of great
weight where such handling has been quite difficult in the
past. The apparatus includes special tilting ?ller blocks
which are used to support the hub of the propeller and
sign and rugged in construction and easy to use.
Further objects of this invention will appear in the de
tailed description which follows and will be further ap
parent to those skilled in the art.
For the purpose of illustration, there is shown in the
accompanying drawings a preferred embodiment of this
invention. It is to be understood that these drawings are
for the purpose of example only, and that the invention is
not limited thereto.
In the drawings:
tilt the blade at the area desired to be Worked upon to a
FIGURE 1 is a top plan view of the apparatus with a
proper horizontal position. When in the horizontal posi 30 propeller shown in dotted lines;
tion, an underlying supporting ram or jack is placed under
FIGURE 2 is a view in front elevation of the appara
the blade and a movable hydraulically operated ram car
tus with a propeller shown in section and a bottom jack
ried by a supporting track is used to bend the blade back
shown in dotted lines;
to the desired shape. The special tiltable ?ller blocks
FIGURE 3 is a view in elevation taken from the left
are designed so that the hub of the propeller can be tilted
I end of FIGURE 2;
from the vertical to a desired position for working appli
FIGURE 4 is an enlarged view in section taken on the
cation by the hydraulic rams. In spite of the great weight
line 4--4 of FIGURE 1 showing the structure of the
of the marine propellers by the use of the tiltable ?ller
movable ram carrying device;
blocks, the propellers can be simply adjusted to the de
FIGURE 5 is a view taken similar to FIGURE 2 but
sired position and the rams may be then easily moved into 40 showing the apparatus in use with a portion of the top
place for the bending and truing operation.
ram carrying device broken away for clarity in showing
This invention, because of the simple adjustment of the
tiltable ?ller blocks, provides for simple and expeditous
application of the apparatus. Further, the tiltable ?ller
the bottom ram or jack in position;
FIGURE 6 is an enlarged view in section taken through
the axis of the ?ller blocks used for the tilting of the pro~
blocks are so designed that a great pressure in the order 45 peller showing the blocks arranged in the vertical pro
peller shaft position;
'
of thousands of pounds per square inch may be exerted
upon the propeller blade while the propeller is held ?rmly
FIGURE 7 is a view in elevation of the ?ller blocks
in position against these great stresses by the tiltable ?ller
blocks and no undue strain is incurred in this application.
The apparatus is comparatively simple in the nature of
its operation and may be used by relatively unskilled work~
men which is of advantage in shop use.
Accordingly, it is an object of this invention to provide
shown in altered position to obtain the tilting of the pro
50
peller shaft;
FIGURE 8 is a view in section taken through the dia
metrical axis of the ?ller blocks of FIGURE 7 showing
the internal construction of the ?ller block tilting device;
FIGURE 9 is a view taken partly in elevation and partly
an apparatus for supporting a propeller in tiltable relation
in section of a modi?ed ?ller block tilting device;
and means for exerting pressure upon the blades to change 55
FIGURE 10 is a view in elevation of the anchoring
their shape.
element employed in the modi?cation of FIGURE 9;
Another object of this invention is to provide an ap
FIGURE 11 is a view taken similarly to FIGURE 9
paratus for supporting a propeller in tiltable relation by a
showing a further modi?ed anchoring element;
shaft supported by rotatable ?ller blocks having a cam sur
FIGURE 12 is another view taken similarly to FIG?
face which provides a tilting of the marine propeller when 60 URE 9 showing a still further modi?ed anchoring ele
the blocks are moved with respect to one another.
ment;
Yet another object of this invention is to provide an
apparatus for working upon propellers in which the pro
FIGURE 13 is a view taken in section through an?
other modi?cation of the ?ller block tilting device em
peller may be supported in various tiltable positions from
ploying the anchoring element of FIGURE 11; and
the vertical position and in which a propeller blade de 65 _ FIGURE 14 is a top plan view of the base tilting block
sired to be worked upon may be bent by the movement of
of FIGURE 13.
The propeller straightening apparatus of this invention
is generally indicated by the reference numeral 10 in
Still another object of this invention is to provide a 70 FIGURES l, 2, 3 and 5. It includes as: its major com
propeller straightening apparatus comprising a table upon
ponents a work table 11 which has a generally T shaped
which the propeller may be supported in various tiltable
con?guration, a tiltable propeller supporting device 12,
an adjustable overhead ram which can be moved into de
sired positions for the propeller blade working operation.
3,032,092
3
4
an adjustable overhead ram carriage 13, and a bottom ram
or jack 14.
The table 11 has a strong steel top so that the pres
sures exerted by the ram upon it will not cause breakage
44. In general, these interfaces may be termed as cammed
surfaces since the rotation of the ?ller blocks 41 and 42
with respect to one another will cause the shifting of the
propeller supporting shaft and also the shifting of the
or distortion. The enlarged portion shown at the right of 5 ?ller blocks 43 and 44, as will be more particularly de
scribed.
FIGURE 1 and comprising the head of the T provides a
base for workmen working upon the propeller blades.
The top ?ller block 41 is secured against rotational
The shank of the T has ?at parallel sides to provide for a
relation with the propeller supporting shaft 46 by a con
rail structure for the adjustable carriage, as best shown
necting key 51. This same relationship holds true for
in FIGURES 1 and 3, in positioning the rams for the 10 the bottom ?ller block 44 which is held against rotatable
straightening of the propeller blade to be Worked upon.
relation with the propeller supporting shaft 46 by a key
The supporting and adjustable carriage 13 for the over
52. It will be noted that the intermediate ?ller blocks
head ram has a generally G-shaped frame or arbor 16
42 and 43 both have enlarged central openings and may
which has two underlying legs 17 and 13 and to provide
both be rotated with respect to the propeller shaft and
for retention upon the table when the hydraulic ram is 15 also the top ?ller blocks 41 and 44. The ?ller blocks are
operated and to give ?rm support to the carriage. Side
maintained in mating relation by annular drive tracks 53
rollers 21 and 22 are provided adjacent the bottom of the
for the top ?ller blocks and drive tracks 54 for the bot
tom ?ller blocks.
frame in order that the carriage may be rolled along the
bed to desired positions of adjustment. At the top of the
A slightly? modi?ed form of tilting device is shown in
carriage and as best shown in FIGURES 3 and 4, ?anged 20 FIGURES 9 and 10. In this modification, use is made
tracks 23 and 24 are provided for transverse movement
of the tilting blocks 41 and 42 supported on the top of
of a hydraulic ram 25. The ram is ?tted with wheels
26 and 27 which are adapted to rest upon tracks in or
der to provide the desired transverse adjustment of the
ram across the table.
The hydraulic ram 25 is connected by fluid pressure
line 28 to a control box 29 situated upon the side of the
frame in order that proper control of the ram may be ex
ercised. At the bottom of the ram is an adjustable ram
the base 11. However, the table or base 11 has an open~
ing 70 of a generally conical con?guration. This is de
sirable to form a rest surface since the bottom tilting
blocks 43 and 44 are not employed. An anchoring de
vice generally indicated by the reference numeral 71 is
utilized in the place of the bottom ?ller blocks. The
anchoring device as shown in FIGURE 10 comprises an
anchoring plate 72 which is locked to the propeller sup
head 31 which is adapted ?to be extended in the operation 30 porting shaft 46 by a bolt 73, with provision being made
for the support of the anchoring plate within the shaft
of the ram by application of the control box 29. The
46 through bifurcated construction. The top of the an
ram is con?ned within the enclosed top structure of the
choring plate is beveled to provide line contact for rock
frame in order that great pressures may be exerted through
ing movement.
the extension of the ram and head31.
'
This type of modi?ed construction of the tiltable ?ller
The ram or jack 14 shown in FIGURES 2 and 5 may
blocks may be employed in handling propellers which are
be positioned in any desired position upon the table 11.
not of the great mass of those employed with the tiltable
by manually moving the same. It is of conventional
?ller blocks of the construction of FIGURES 6 through
structure and has an adjustable top ram head 33 which
8. It will be observed that through the deletion of the
is adapted to be operated to various positions by the use
of the operating handle 34. It is to be understood that 40 bottom ?ller blocks the apparatus may be employed ob
viously without the required movement of the bottom
this manually movable ram may be made in other modi
?ller blocks which reduces the amount of work involved.
?cations such as by movably supporting it upon a track
Further modi?ed anchoring devices are shown in FIG
on the base as will be well understood in the art.
URES 11 and 12. The modi?ed anchoring devices are
The tiltable ?ller block device for supporting the pro
indicated by the numeral 80 in FIGURE 11 and 81 in
peller and, generally indicated by the reference numeral
FIGURE 12, and it will be observed that there is a dif
12, is best shown in construction in FIGURES 2, 3, 5, 6,
ference in the bottom construction, as will further appear.
7 and 8. The device comprises top side ?ller blocks 41
The modi?ed form of anchoring device 80, shown in
and 42 and bottom side ?ller blocks 43 and 44 which are
FIGURE 11, employs the same top ?ller blocks 41 and
supported on the top and the underneath side of the table
respectively. These ?ller blocks are somewhat in the 50 42 shown in the construction of FIGURES 6 through 8,
and in FIGURES 9 and 10. However, it will be observed
form of a capstan and are each provided with holes 45
that the opening 82 in the base 11 through which the
around their periphery for the insertion of a capstan bar
propeller supporting shaft 46 passes is of a modi?ed con
for rotating the ?ller blocks to provide the desired tilt
able adjustment.
struction. Thus at its top it comprises a frusto-conical
The propeller tilting device 12 further includes a pro 55 surface 83 and at the bottom it has a partially spherical
con?guration, as designated at 84. The anchoring device
peller supporting shaft 46 which passes through each of
itself comprises a hemispherical element 85, which nests
the ?ller blocks and which has a tightening nut 47 at the
within the surface 84 of the opening in the base. The
bottom which is also provided with a capstan hole 45
anchoring element is tightened on the shaft by a stop nut
for secure tightening. In FIGURE 2, a propeller gen
erally indicated by the reference numeral 48 is shown 60 86.
supported upon the top ?ller block 41 and is secured
In the slightly modi?ed construction of FIGURE 12,
in place by a top nut 49, likewise provided with capstan
the anchoring device 81 uses the same type of opening as
holes.
above-described in FIGURE 11, and identical reference
As particularly shown in FIGURES 6 and 8, all of the
numerals are employed. However, the anchoring ele
?ller blocks 41, 42, 43 and 44 are of a hillside washer 65 ment 91 is comprised of a spherical con?guration and
con?guration. Thus, each one of the four blocks has a
may be ?rmly secured to the propeller supporting? shaft
?general con?guration of a Washer with one side being
46 by means of threads or other types of af?xation. A
provided of a plane surface perpendicular to the axis of
hearing support 92 is secured to the bottom of the base 11
the washer and the other side having a slanting relation
and with the cooperation of the surface 84 of the base
to the axis. This is best shown in FIGURE 6 where it it 70 opening provides a ?rm and secure bearing for the an
seen that the ?ller blocks when completely assembled to
choring element 91. For the construction of the anchor
support the supporting shaft 46 in the vertical position
ing device of FIGURE 11, friction and wear are reduced
have the con?guration of a cylinder with the interfaces
by the provision of the spherical form of the bearing,
between the ?ller blocks 41 and 42 being parallel to the
and the engagement with the mating surface of the base
interfaces between the bottom side mating blocks 43 and 75 11 of the anchoring element. Adjustment is provided by
3,032,092
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a top propeller shaft nut 49 as in earlier described em
In the truing operation, it is desired that all points along
bodiments.
the radial lines 62 and 63 be straight or ?at, such that a
?at rule or the like may be laid along these lines and the
surfaces be entirely trued. The pitch, of course, will vary
In FIGURE 13, there is shown a modi?ed form of the
tiltable ?ller block construction. This modi?cation pro
vides for tilting of the propeller shaft and the supported
propeller without the requirement of adjusting the lock
nuts upon the propeller supporting shaft. This is
achieved through the hemispherical mating relation of
along the different surfaces of the propeller blade and in
order to provide a substantially flat surface for the par
ticular point to be bent, such as the bent portion 64,
shown in FIGURES 2 and 5 of the propeller blade, it is
the ?ller blocks and also a hemispherical construction
desired that the propeller blade be adapted to be tilted.
of the anchoring bearing which is identical with the an 10 This is performed by the tilting device 12 so that when the
choring device of FIGURE 11, and for which similar
bent portion is worked upon the propeller blade at this
reference numerals will be employed. A top ?ller block
point is horizontal for best results.
101 is employed which is provided with capstan holes 45.
In the working operation shown in FIGURE 5, the
This block has an opening to receive the propeller sup
propeller 43 is first of all securely positioned upon the
porting shaft 46, and a ?at top surface upon which the 15 top of the top ?ller block 41 and screwed tight by the
propeller 48 is supported. The bottom surface 102 of
nuts 49 and 47. Assuming that the bent portion 64 to be
the top block is of a generally spherical con?guration,
worked upon in FIGURE 5 is properly in a horizontal
so that it may be positioned upon and mate with the bot
plane, the supporting ram carriage 13 may be moved from
the initial position shown in FIGURE 2 by merely rolling
tom block 103.
The bottom block 103 is substantially of a hemispheri 20 it on its wheels ?21 and 22 to the working position shown
cal con?guration in which the radius is the same as that
in FIGURE 5. The manual jack 14 is then placed under
of the top block 101. This block is also provided with
neath the bent portion and the jack head 33 is elevated
the usual capstan holes 45. It is further provided with a
into contact with the underneath side of the ?ller blade.
frusto-conical opening 104- which mates with the top
Subsequently the hydraulic ram is operated by operation
frusto-conical surface 83 and the opening within the 25 of the control box 29 and the hydraulic ram head 31
is lowered to exert a great amount of pressure upon the
base 11.
In the construction shown in FIGURE 13, the top
bent portion and to bend the blade back. to the true posi
?ller block 101 may be turned and rotated in any desired
tion.
direction upon the top surface of the bottom ?ller block
During this operation, the propeller 48 is securely and
103. It will be observed that the width of the block 101 30 immovably maintained in locked position by the tiltable
must be slightly greater than the width of a chord drawn
securing device 12 and the application of several thousand
across the top opening 104 to prevent the block falling
down within the opening in the vertical position. How
pounds per square inch may be applied to the propeller
blade. In this working application, the bottom legs 17
ever, a substantial amount of rotation and tilting may be
and 18 of the hydraulic ram carriage frame will contact
effected through this construction.
35 the underneath side of the table when the hydraulic ram
A further modi?ed form of tiltable ?ller block con
head 31 is operated and great pressures may be brought
struction is shown in FIGURE 14. In this construction,
to bear through the strong construction of the hydraulic
the identical type of top ?ller block 101 and anchoring
ram and hydraulic ram supporting carriage.
device 80 or 311 may be employed as previously described
Where the pitch of the propeller is such that the pro
in FIGURE 13. However, the bottom ?ller block 106 is 40 peller blade must be tilted to present a horizontal surface
of a slightly modi?ed construction from the ?ller block
adjacent to the bent portion to be worked upon, as is
103. Thus, in FIGURE 13, the ?ller block was pro
usually the case, the propeller shaft must be tilted to a
wided with a frusto-conical opening 104. The frusto
position such as shown in FIGURES 7 and 8 for the tilt
conical opening makes possble the movement of the top
ing device 12. The tilting is effected by inserting a capstan
?ller block without movement of the bottom ?ller block
bar or long operating rod, indicated by the reference
where such type of operation is desired. However in FIG
numeral 65 in FIGURES 1 and 2, in the holes 45 in the
URE 14, a greater amount of tilt is effected through the
?ller blocks. In this tilting operation, when capstan bars
employment of a slotted opening 107. In this type of
65 are inserted in both the top intermediate block 42 and
slotted opening, the side walls of the opening designated
the bottom intermediate block 43, these blocks may be
108 and 109 may form a wider angle than the side walls 50 rotated with respect to the intermediate blocks 41 and 44
of the opening 104 and the walls forming the opening 83
to effectuate the tilting of the supporting propeller shaft
in the base 11 may also be of a wider divergence to mate
and the propeller. The tilting of the blocks to the relation
with the opening 107. Through this construction, the
shown in FIGURES 7 and 8 is effected when the blocks
filler block 101 may be employed without being limited
42 and 43 are caused to be rotated, with respect to their
by the size of the opening 104 of the construction shown
initial position shown in FIGURE 6, through one-half
in FIGURE 13. It will be observed, however, that in
revolution. Thus, for the positions shown in FIGURES
the modi?ed construction of FIGURE 14 for the bottom
7 and 8, each of the ?ller blocks 42 and 43 should be
?ller block 103 a compound movement comprising tilt
operated by a capstan bar to effect the desired relation.
ing of the top ?ller block 101 or radial movement upon the
his brings a general tilting relation of the propeller
bottom ?ller block must be employed, while the bottom
shaft in a?clockwise direction as viewed. in the drawings.
?ller block 103 is rotated in a horizontal plane.
The operation of the capstan bars in either of the top or
bottom blocks 41 and 44 will effect a rotation in the
Use
counterclockwise direction. Only one capstan bar is
needed in this latter operation since both blocks 41 and
The apparatus of this invention is shown ready for use
44 are keyed to the propeller shaft.
in FIGURE 5. In this showing, the propeller 48 has a
In the rotation of the ?ller blocks shown in the set-up
damaged blade 60 positioned underneath the ram carriage
of FIGURE 5, it may be required to rotate all ?ller blocks
for the straightening operation.
to insure that the area of the propeller to be worked
In this straightening operation, it is desired to straighten
upon is in proper registry with the table to be presented
the propeller blade 60 to the original trued surface. It
is a very important consideration in most propeller de 70 underneath the carriage supported ram. This is effected
by rotating all the blocks together as a cylinder. This
signs that the radial surfaces of the propeller blade be
operation is carried out by inserting a capstan bar in each
true in order to provide the maximum propulsion ef?
of the intermediate blocks 42 and 43, and either one of
ciency. Thus the propeller blade 60, as shown in FIG
the top or bottom blocks 41 and 44. Thus, if in an initial
URE 1, in the truing operation may have radial lines 62
and 63 drawn in chalk from the center of the propeller. 75 adjustment, it is determined that the propeller blade ex
3,032,092
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8
tending to the left in FIGURE 1 is presented in a hori
zontal position, in the 11 o?clock position instead of the 9
o?clock position, all of the filler block elements can be
rotated about 60 degrees in a counterclockwise position.
Through the rotation of the ?ller blocks as above
described full universal tilting of the propeller may be
efiectuated so that any portion of the surface of the
propeller blade on desired to be worked upon may be
disposed substantially horizontally. A further ease and
When this is effected, the desired horizontal positioning
will be realized.
.The modi?ed tilting device shown in FIGURE 9 is
convenience in the bending operation is eltectuated by
the adjustability of the hydraulic ram through its carriage
adapted to be employed in the same manner as above de
which is movable upon the table and also by the adjust
scribed. However, the anchoring device '71 has been
able feature of the ram itself with respect to its support
substituted for the bottom ?ller blocks 43 and 44s, and 10 carriage by virtue of the tracks 23 and 24. It is to be
the full load and support is accomplished through the
understood that the bottom jack 114 can of course be
use of only the top blocks 41 and 4'2. In the tilting opera?
tion and rotation of the blocks, either block 41 or 42
manually moved to any desired position so that full and
complete ?exibility is obtainable in the propeller straight
may be moved by insertion of the capstan bar 65 into
ening apparatus.
the capstan holes 45 of the blocks. In the operation the 15
By virtue of the particular construction of the tilting
top adjustment nut 4? may be loosened or tightened de
pending upon whether the tilt is to or from the vertical
device through the rotatable ?ller blocks an even stress
distribution and a very secure foundation is provided for
position. The anchoring device 71 and the anchoring
supporting the propeller in the various tiltable positions.
plate 72 provide a very simple means for retaining the
When it is to be understood that the propellers to be
propeller supporting shaft at the bottom of the base 11. 20 worked upon are marine propellers used upon large vessels
The operation of the propeller supporting ?ller blocks
and are quite heavy and sizable in dimensions and also
shown in FIGURES 11 and 12 is e?ected in identical
that pressures in the order of several thousand pounds
manner with that shown in the modi?cation of FIGURE
per squa'e inch are employed, the advantage of a very
9.
in both of FIGURES 11 and 12. Thus, FIGURE 11 has
a substantially hemispherical anchoring element 85 em
ecure foundation is readily understood. The bearing
relation of the mating ?ller block and the rotatable rela
tionship provided furnishes a very ?rm foundation for
ployed which is adapted to be drawn tight by the lock
the bending operation and the same relationship is enjoyed
However, a different anchoring device is employed
nut 86.
This provides for more even distribution of
by the bottom ?ller blocks '43 and 44, when desired to
be employed for massive propellers. This structure
the opening in the base 11. This same feature is ob 30 enables great stresses to be successfully resisted and pro
tained through the use of the modi?ed anchoring device
vides for great ?exibility in the handling of various sized
31 in FIGURE 12 which uses the anchoring element 91 in
propellers. It is to be understood that where propellers
Stresses through the hemispherical mating surface with
the form of a sphere.
However, through the employ~
merit of the bearing bracket 92 the retaining element 91
are used having a different axial opening of a size larger
than the shaft 46 sleeves and shims and the like can be
is maintained in proper position at all times. Thus, in the
used to provide for the proper support. Further ?exi
modi?cation of FIGURE 12, only the top lock nut 49
upon the propeller supporting shaft would be required
bility is provided through the adjustable securing nuts
to be adjusted.
The modi?cation of the ?ller block structure shown in
FIGURE 13 provides for rotation and tilting of the pro
peller without any adjustment of the top lock nut 49 or
the bottom lock nut 47, except in cases where this is
desired to lessen friction. The spherical con?guration of
the interengaging faces of the top of the ?ller block
163 and the bottom of the top lock 161 provides for
any desired combination of rotation or tilting. Through
the concentric relationship of all of these surfaces, and
the bottom anchoring device using the anchoring ele
ment 85, there is no need of loosening or tightening the
lock nuts upon the propeller shaft. This is because the
distance or spacing between the lock nuts remains the
same through all positions and is never required to be
changed. This is made possible through the concentric
relationship between the blocks and the anchoring ele
ment.
The rotation of the ?ller blocks is effected in
the same manner as above described for the ?ller blocks
457 and 49 in the operation of this apparatus.
Various changes and modi?cations may be made in
this invention as will be apparent to those skilled in the
art. Such changes and modi?cations are within the
scope and teaching of this invention as de?ned in the
claims appended hereto.
What is claimed is:
1. A work support for use in straightening a selected
surface of a propeller blade comprising a ?at work table,
means including a universal support member for support
ing the hub of the propeller blade with the selected sur
face of the blade to ?be straightened overlying the work
table, said hub supporting means further including a sup
port s_.aft engageable with and passing through the uni
versal support member, said support shaft being con~
nected at one end to the propeller hub and at the oppo
site end to anchoring means at the bottom of the work
table, said universal support member being adjustable for
tilting the propeller blade to be straightened to a pre
selected position, said universal support member com
iii and 42, through the use of the capstan bar which
prising a pair of cooperating relatively rotatable propeller
is inserted in the capstan holes 45. Further, the
supporting cylinders, said cylinders being relatively rotat
?ller block ltll may be moved to di?crent radial posi~
able to a position where the axis of the propeller hub
tions upon the top of the ?ller block 103? by merely 60 is vertical and wherein the sides of the cylinders are
pushing the propeller to the desired position. This re
vertical, and the cylinders having a mating surface lying
quires that there be no severe tightening of the lock nuts,
obliquely to the axis of said cylinders.
such as to prevent such manual movement.
2. Apparatus for straightening a selected surface of a
In the modi?cation of FlGURE 14, the propeller may
propeller blade comprising a flat work table, means
be rotated in the same manner as above described for 65 including a universal support member having a support
the modi?cation of FEGURE 13. However, tilting can
shaft for supporting the hub of the propeller blade with
be effected only through movement within the slot H37,
the Selected surface of the blade to be straightened over
and the same freedom of movement of the mechanism
lying the work table, and means for straightening the
shown in FIGURE 13 is not possible. However, a wider
selected surface of the blade comprising an adjustable
degree of tilt is realized since the angle between the faces 70 support movable upon the work table into contacting
108 and 1&9 and also the angle prescribing the funnel
relation with the underneath side of the propeller blade
shaped opening 83 within the base 11 may be increased.
and an overhead jack operable to exert pressure against
This is quite advantageous in some applications, such
the desired portion of the blade to bend it to a desired
as in working upon propellers having
pitch in the blades.
high degree of
relationship, said universal support member comprising
75 ?rst and second pairs of relatively rotatable propeller
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9
supporting cylinders with each of said pairs of cylinders
being comprised of cylinders having mating surfaces
rotatable to a position where the axis of the propeller
hub is vertical and wherein the sides of the cylinders are
vertical.
formed obliquely to their axis, said ?rst pair of cylinders
6. A work support for use in straightening a selected
being supported on the work table and said second pair
being supported underneath the work table by a lower C1 surface of a propeller blade comprising a flat work table,
means including a universal support member for sup
end of the support shaft.
porting the hub of the propeller blade with the selected
3. Apparatus for straightening a selected surface of a
surface of the blade to be straightened overlying the
propeller blade comprising a flat work table, means
Work table, said hub supporting means further including
including a universal support member having a support
shaft for supporting the hub of the propeller blade with 10 a support shaft engageable with and passing through the
universal support member, said support shaft being con
the selected surface of the blade to be straightened over
nccted at one end to the propeller hub and at the opposite
lying the work table, and means for straightening the
end to anchoring means at the bottom of the work table,
selected surface of the blade comprising an adjustable
said universal support member being adjustable for tilt
support movable upon the work table into contacting
relation with the underneath side of the propeller blade 15 ing the propeller blade to be straightened to a pro-selected
position, said universal support member comprising a
and an overhead jack operable to exert pressure against
pair of cooperating relatively rotatable propeller support
the desired portion of the blade to bend it to a desired
ing members ?tting against one another, said members
relationship, said universal support member comprising
?rst and second pairs of relatively rotatable propeller
being in rotatable engagement with one another, said
supporting cylinders with each of said pairs of cylinders 20 members being relatively rotatable with one another from
one position where the axis of the propeller support
being comprised of cylinders having mating surfaces
shaft is vertical to another position where the propeller
formed obliquely to their axis, said ?rst pair of cylinders
support shaft is tilted.
being supported on the work table and said second pair
7. Apparatus for use in straightening a selected surface
being supported underneath the work table by a lower
end of the support shaft passing through an opening in 25 of a propeller blade comprising a ?at Work table, means
including a universal support member for supporting the
the work table, said shaft keying a topmost cylinder in
hub of the propeller blade with the selected surface of
the ?rst pair to a bottornmost cylinder in the second pair
the blade to be straightened overlying the work table,
against relative rotation, said shaft being further secured
said universal support member being pivotable for tilting
to the propeller hub.
4. Apparatus for straightening a selected surface of a 30 the propeller blade to be straightened to a pro-selected
position, said universal support member comprising a pair
propeller blade comprising a flat work table, means
of cooperating relatively rotatable propeller supporting
including a universal support member having a support
cylinders, said cylinders being relatively rotatable to a
shaft for supporting the hub of the propeller blade with
position where the axis of the propeller hub is vertical
the selected surface of the blade to be straightened over
lying the work table, and means for straightening the 35 and wherein the sides of the cylinders are vertical, and
the cylinders having a mating surface lying obliquely to
selected surface of the blade comprising an adjustable
the axis of said cylinders.
support movable upon the work table into contacting
8. Apparatus for use in straightening a selected sur
relation with the underneath side of the propeller blade
face of a propeller blade comprising a ?at work table,
and an overhead jack operable to exert pressure against
means including a universal support member for support~
the desired portion of the blade to bend it to a desired
ing the hub of the propeller blade with the selected surface
relationship, said universal support member comprising
?rst and second pairs of relatively rotatable propeller
of the blade to be straightened overlying the work table,
said hub supporting means further including a support
supporting cylinders with each of said pairs of cylinders
being comprised of cylinders having mating surfaces
shaft engageable with and passing through the universal
formed obliquely to their axis, said ?rst pair of cylinders 45 support member, said support shaft being connected at
being supported on the work table and said second pair
being supported underneath the Work table by a lower
end of the support shaft passing through an opening in
the work table, said shaft keying a topmost cylinder
in the ?rst pair to a bottommost cylinder in the second 50
pair against relative rotation, said shaft being further
secured to the propeller hub, and means for maintaining
the cylinders in each pair in cooperating relation when
they are relatively rotated comprising a circular ?ange
in one of the cylinders disposed in mating relation with 55
a groove in another cylinder.
5. Apparatus for straightening a selected surface of a
propeller blade comprising a ?at Work table, means
including a universal support member having a support
shaft for supporting the hub of the propeller blade with 60
the Selected surface of the blade to be straightened over
one end to the propeller hub and at the opposite end
to anchoring means at the bottom of the work table,
said universal support member being pivotable for tilt
ing the propeller blade to be straightened to a preselected
position, said universal support member comprising a
pair of cooperating relatively rotatable propeller sup?
porting cylinders, said cylinders being relatively rotatable
to a position where the axis of the propeller hub is
vertical and wherein the sides of the cylinders are ver
tical, and the cylinders having a mating surface lying
obliquely to the axis of said cylinders, said support shaft
extending through an opening in the work table and
said anchor means bearing against the bottom of the
table.
9. Apparatus for use in straightening a selected sur
face of a propeller blade comprising a ?at work table,
means including a universal support member for support
ing the hub of the propeller blade with the selected surface
lying the work table, and means for straightening the
selected surface of the blade comprising an adjustable
of the blade to be straightened overlying the Work table,
support movable upon the work table into contacting
relation with the underneath side of the propeller blade 65 said hub supporting means further including a support
shaft engageable with and passing through the universal
and an overhead jack operable to exert pressure against
support member, said support shaft being connected at
the desired portion of the blade to bend it to a desired
one end to the propeller hub and at the opposite end
relationship, said universal support member comprising
to anchoring means at the bottom of the work table,
?rst and second pairs of relatively rotatable propeller
supporting cylinders with each of said pairs of cylinders 70 said universal support member being pivotable for tilt
being comprised of cylinders having mating surfaces
formed obliquely to their axis, said ?rst pair of cylinders
ing the propeller blade to be straightened to a pre-selected
position, said universal support member comprising a
being supported on the Work table and said second pair
being supported underneath the work table by a lower
pair of cooperating relatively rotatable propeller sup
porting cylinders, said cylinders being relatively rotatable
end of the support shaft, said cylinders being relatively 75 to a position where the axis of the propeller hub is
3,032,092
i It
12
vertical and wherein the sides of the cylinders are ver
tical to another position where the propeller support shaft
is tilted, said members having mating partially spherical
surfaces, said support shaft extending through an opening
tical, and the cylinders having a mating surface lying
obliquely to the axis of said cylinders, said support shaft
extending through an Opening in the Work table and
said anchor means bearing against the bottom of the
table, said anchoring means comprising an anchoring
element having an at least partially spherical bearing
surface which bears in a mating cavity in the bottom
in the work table and said anchor means bearing against
the bottom of the table.
13. A work support for use in straightening a selected
surface of a propeller blade comprising a ?at work table,
means including a universal support member for support
ing the hub of the propeller blade with the selected surface
of the Work table.
10. Apparatus for use in straightening a selected sur 10 of the blade to be straightened overlying the work table,
said hub supporting means further including a support
face of a propeller blade comprising a flat work table,
shaft engageable with and passing through the universal
means including a universal support member for support
ing the hub of the propeller blade with the selected surface
of the blade to be straightened overlying the work table,
said hub supporting means further including a support
support member, said support shaft being connected at
one end to the propeller hub and at the opposite end to
anchoring means at the bottom of the work table, said
universal support member being adjustable for tilting the
propeller blade to be straightened to a pre-selected posi
tion, said universal support member comprising a pair of
one end to the propeller hub and at the opposite end
cooperating relatively rotatable propeller supporting mem
to anchoring means at the bottom of the work table,
said universal support member being pivotable for tilt 20 bers ?tting against one another, said members being in
rotatable engagement with one another, said members
ing the propeller blade to be straightened to a pre-selected
being relatively rotatable with one another from one posi
position, said universal support member comprising a
tion where the axis of the propeller support shaft is ver
pair of cooperating relatively rotatable propeller sup
tical to another position where the propeller support shaft
porting cylinders, said cylinders being relatively rotatable
shaft engageable with and passing through the universal
support member, said support shaft being connected at
to a position Where the axis of the propeller hub is 25 is tilted, said members
surfaces, said support
vertical and wherein the sides of the cylinders are ver
frusto-conical openings
tical, and the cylinders having a mating sur ace lying
most of said members
obliquely to the axis of said cylinders, said support shaft
having mating partially spherical
shaft passing through inverted
in the Work table and the lower
and said anchor means bearing
against the bottom of the table.
extending through an opening in the work table and
14. A work support for use in straightening a selected
said anchor means bearing against the bottom of the 30
surface of a propeller blade comprising a ?at work table,
table, said anchoring means comprising an anchoring
means including a universal support member for support
element having an at least partially spherical bearing
ing the hub of the propeller blade with the selected sur
surface which bears in a mating cavity in the bottom
face of the blade to be straightened overlying the work
of the work table, at the top of said element and a bearing
plate secured to the bottom of the work table for sup 35 table, said hub supporting means further including a sup
port shaft engageable with and passing through the uni
porting the bottom of said element.
versal support member, said support shaft being con
11. A work support for use in straightening a selected
ected at one end to the propeller hub and at the opposite
surface of a propeller blade comprising a ?at Work table,
end to anchoring means at the bottom of the work table,
means including a universal support member for support
ing the hub of the propeller blade with the selected sur 40 said universal support member being adjustable for tilting
the propeller blade to be straightened to a pre-selected
face of the blade to be straightened overlying the work
position, said universal support member comprising a pair
table, said hub supporting means further including a sup
port shaft engageable with and passing through the uni
of cooperating relatively rotatable propeller supporting
versal support member, said support shaft being con
nected at one end to the propeller hub and at the opposite
end to anchoring means at the bottom of the work table,
in rotatable engagement with one another, said members
said universal support member being adjustable for tilting
the propeller blade to be straightened to a pre-selected
position, said universal support member comprising a pair
of cooperating relatively rotatable propeller supporting
members ?tting against one another, said members being
i being relatively rotatable with one another from one posi
tion where the axis of the propeller support shaft is verti
cal to another position where the propeller support shaft
is tilted, said members having mating partially spherical
surfaces, said support shaft passing through inverted
frusto-conical openings in the work table and the lower
most of said members, said anchoring means comprising
an anchoring element having an at least partially spherical
bearing surface which bears in a mating cavity in the
tion where the axis of the propeller support shaft is verti
bottom of the work table.
cal to another position where the propeller support shaft
15. A work support for use in straightening a selected
is tilted, said members having mating partially spherical
surface of a propeller blade comprising a ?at work table,
surfaces.
means including a universal support member for support
12. A work support for use in straightening a selected
ing the hub of the propeller blade with the selected sur
surface of a propeller blade comprising a flat work table,
means including a universal support member for support 60 face of the blade to be straightened overlying the work
table, said hub supporting means further including a sup
ing the hub of the propeller blade with the selected sur
port shaft engageable with and passing through the uni:
face of the blade to be straightened overlying the work
versal support member, said support shaft being connected
table, said hub supporting means further including a sup
at one end to the propeller hub and at the opposite end
port shaft engageable with and passing through the uni
to anchoring means at the bottom of the work table, said
versal support member, said support shaft being con
universal support member being adjustable for tilting the
nected at one end to the propeller hub and at the opposite
propeller blade to be straightened to a pre-selected posi
end to anchoring means at the bottom of the work table,
tion, said universal support member comprising a pair of
said universal support member being adjustable for tilting
cooperating relatively rotatable propeller supporting mem
the propeller blade to be straightened to a pro-selected
position, said universal support member comprising a pair 70 bers ?tting against one another, said members being in
rotatable engagement with one another, said members
of cooperating relatively rotatable propeller supporting
being relatively rotatable with one another from one po
members ?tting against one another, said members being
sition where the axis of the propeller support shaft is
in rotatable engagement with one another, said members
vertical to another position Where the propeller support
being relatively rotatable with one another from one posi
tion where the axis of the propeller support shaft is ver , shaft is tilted, said members having mating partially
members ?tting against one another, said members being
in rotatable engagement with one another, said members
being relatively rotatable with one another from one posi
3,032,092
13
14
spherical surfaces and said support shaft passing through
rotated comprising a circular ?ange in the mating surface
of one of the cylinders disposed in mating relation with
a slotted opening in the lowermost of said members.
a groove in the mating surface of the other cylinder.
16. A work support for use in straightening a selected
surface of a propeller blade comprising a ?at work table,
means including a universal support member for support
References Cited in the ?le of this patent
UNITED STATES PATENTS
ing the hub of the propeller blade with the selected surface
of the blade to be straightened overlying the work table,
said hub supporting means further including a support
shaft engageable with and passing through the universal
support member, said support shaft being connected at 10
one end to the propeller hub and at the opposite end to
anchoring means at the bottom of the work table, said
universal support member being adjustable for tilting the
propeller blade to be straightened to a pre-selected posi
tion, said universal support member comprising a pair of
cooperating relatively rotatable? propeller supporting
15
cylinders, said cylinders being relatively rotatable to a
position where the axis of the propeller hub is vertical
1,548,521
1,562,626
1,579,582
1,733,671
1,971,821
2,013,705
2,233,371
2,393,317
2,489,815
2,495,065
2,726,703
and wherein the sides of the cylinders are vertical, and the
cylinders having a mating surface lying obliquely to the
axis of said cylinders, and means for maintaining the 20
cylinders in cooperating relation when they are relatively
Fowler _______________ __ Aug. 4,
Finkbeiner __________ __ Nov. 24,
Voltz ________________ __ Apr. 6,
Moody ______________ __ Oct. 29,
Johnston ____________ _._ Aug. 28,
Warren _____________ .._ Sept. 10,
Smith ________________ _- Feb. 25,
Edwards ______________ .__ Jan. 22,
Rader _______________ __ Nov. 29,
Hull _________________ __ Jan. 17,
Fnltz ________________ __ Dec. 13,
1925
1925
1926
1929
1934
1935
1941
1946
1949
1950
1955
FOREIGN PATENTS
134,762
117,577
Great Britain _________ __ Nov. 13, 1919
Sweden ______________ __ Nov. 5, 1946
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