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Патент USA US2122662

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‘July 5, 1938.
J. c. SHAW
2,122,662
PROPELLER sunmcme momma
Filed May 6, 1937
7 Sheets-Sheet 1
July 5, 1938.
J. c. SHAW
2,122,662
PROPELLER SURFACING MACHINE
Filed May 6, 1937
7 Sheets-Sheet 2
NVENTOR
, J76’. SHAW
ATTORNEY
'
July 5, 1938.
J. c. SHAW
2,122,662
PROPELLER SURFACING MACHINE
Filed May 6, 1937
'7 Sheets-Sheet 3
July 5, 1938.
J. Q SHAW
2,122,662
PROPELLER SURFACING MACHINE
Filed May 6, 1937
7 Sheets-Sheet 4
4
46
r
l
91/,
INVENTOR
J.' C’. SHAW
July 5, 1938.
J. c. SHAW
2,122,662
PROPELLER SURFACING MACHINE
Filed May 6, 1937
7 She'ets-Sheet 5
MN
‘INVENTOR
J.‘ C 674A w
MW
[BY
%/
ATT RNEY
July 5, 1938.
J. c. SHAW
2,122,662
PROPELLER suamcme mxcam:
Filed May 6. 1957
7 Sheets-Sheet 6
INVENTOR
J'C.’ SHAW
/
ATT RNEY
July 5, 1938.
J. c. SHAW
2,122,662
PROPELLER SURFACING MACHINE
Filed May 6, 1937
7 Sheets-‘Sheet .7
1579/0
x79. //
2,122,662
Patented July 5, 1938
UNITED STATES ~
PATENT OFFICE
2,132,862
raoramaa suaracmo moms
John 0. Shaw, use“, Conn., assignor to. Niles
Bement-Pond Company, Hartford, Coma, a
corporation of New Jersey
Application May 6, 1937, Serial No. 141,132
8Claims. (CL 90-41)
This invention relates to propeller surfacing appended to this speci?cation being relied upon
for that purpose.
machines and particularly to a machine for sur
In the drawings:
facing opposite faces of marine propeller blades
of large size.
5
,
.
peller ?nishing machine made in accordance with v 5
An- object of the present invention is to provide
the present invention, parts being shown in sec
tion for better illustration.
a machine having a tracer and cutting tool, the
‘ tracer being movable over a template correspond
Fig. 2 is a vertical sectional view of the com
ing to a surface of the propeller blade and the
plete machine taken upon a plane at right angles
to Fig. 1.
10
Fig. 3 is a plan view of the machine, one side
tool being guided in its movements over the
10 blade by means associated with and controlled by
the tracer and its contact with the template.
Another object of the invention is to provide
a turret rotatable as a unit upon a vertical axis.
and disposed coaxially with-the propeller being
ably mounting the supports carryingthe tracer
and cutting tool respectively for movements radi
ally toward and from the axis of the turret and
vertically up and down.
_
Another object of the invention is to provide
mechanism for oscillating the turret about its axis
through varying arcs depending upon the width
of the propeller surface being ?nished, this os
cillatory movement taking place simultaneously
0,- with movements vertically of the tracer and tool
“ in accordance with the template or model being
followed, feeding means being- provided to sue
cessivelymove the tracer and tool radially a short
distance either toward or from the axis between
30 each oscillatory movement of the turret.
’
A feature of importance of the invention also
is the application of the control mechanism and
electric circuits shown and described in my Pat
ent 1,683,581 granted September 4, 1928 to a pro
35 peller surfacing -machine without substantial
modi?cation or addition.
.
And ?nally it is an object of the invention
provide a reducing means between the tracer and
the tool enabling a smaller and more convenient
40 template to be used than the propeller being ?n
ished so that the distances moved by the tracer
- may be materially less than those of the tool.
With the above and other objects in view, my
invention consists in the features of construction
45 and operation set forth in the following speci?cae
tion and illustrated in the accompanying draw
ings.
being broken away.
.
Fig. 4 is a front elevation of the cutting tool
and mounting therefor.
Fig. 5 is a side elevation of the parts shown in 15
15 ?nished, the turret providing means for mov
20
_
Figure 1 is a complete side elevation of a pro
.
In the accompanying drawings annexed hereto
and forming a part of this speci?cation, I have
50 shown the invention embodied in and adapted for
a surfacing machine for propellers of extremely
large size but it will be understood that the inven
tlon can be otherwise embodied and that the
Fig. 4.
Fig. 6 is an enlarged view of parts shown in
Fig. 2, this ?gure showing the tool carriage and
its controlling mechanism for moving the car
riage radially and for moving the tool spindle 20
therein vertically.
Fig. 7 is a view similar to Fig. 6 and showing
the means for moving the tracer support radially
and for moving the tracer bar vertically.
Fig. 8 is a detail view in section showing the 25
tool mounting~ end of the tool spindle upon an en
larged scale over Fig. 5.
-
‘
Fig. 9 is a detail section through the track;
upon which the turret revolves.
Fig. 10 is a cross sectional view taken on they 30
plane of line Iii-II of Fig. 6; and ,
Fig. 11 is a cross sectional view taken on the
plane of line il--il of Fig. '1.
In the above mentioned drawings there has
been shown but one embodiment of the invention 35
which is now deemed preferable, but it is to be
understood that changes and modi?cations may
be made within the scope of the appended claims
without departing from the spirit of the in
vention.
40
Brie?y and in its broadest aspect the invention -
may include the following principal parts: First,
a ?xed circular track or guideway surrounding
a pit or excavation within which the propeller
being surfaced may be centrally mounted; second, 45
a turret rotatably mounted thereon; third, means
to revolve the turret in either direction; fourth,‘
supporting means within the excavation or pit so
that the propeller being ?nished may be coaxial
with the axis of rotation of said turret; ?fth, a 50
tool supporting carriage movable substantially
radially on said turret; sixth, a tool head verti
cally movable within ‘the carriage; seventh, a cut
ting tool rotatably mounted and extending from
drawings are not to be construed'as de?ning or ’
55 limiting the scope of the invention, the claims the lower end of said head; eighth, a template as
.2
'
9,133,609
mounted independently of the turret and ind
-
able about the guideway to successive angular
positions; ninth, a tracer - supporting carriage
V10
movable substantially radially on said turret;
tenth, a tracer carrying slide movable vertically
in said latter carriage; eleventh, a tracer in the
slide adapted to contact said template during op
eration; twelfth, means preferably in the form of
electric circuits and controlled by engagement of
the tracer with the template for raising and
lowering the tracer and cutter in conformity
therewith as the turret is oscillated between pre
determined limited angular positions; and ‘thir
teenth, means to feed the tracer and cutter suc
15 cessively to different radial positions after each
oscillatory movement of the turret.
I
_
Fig. 3 so that the chain ll may be tightened about
the ways II. By rotating the sprockets II by
any suitable means the turret II will be rotated,
there being locking means or sufficient friction
of the chain It against the outer surface of the
circular ways II to prevent rotation of the chain
relative to the track.
'
The driving means for the sprocket wheels ll
shown in Figs. 1 and 3 may comprise a small
motor 2| constantly driven in one direction, op-' 10
posed clutches 22 being driven thereby and adapt
ed to rotate a pinion 28 in opposite directions de
pending upon which of the clutches 22 is engaged.
This motor 2| and opposed clutch mechanism 22
are in every way similar to corresponding parts 16
shown in Figs. 13 and 14 of the drawings in my
above-referred to patent. It will su?ice to state
that upon energization of an appropriate control
The surfaces on opposite faces of the blades of
marine propellers are generally helicoidal but
depart from the exact surface of a helicoid, each circuit one or the other of the clutches 22 is en
20 side having its own modi?cations to provide suffi
This drivingly connects the motor 2| 20
cient strength in the different portions of the ergized.
with the pinion 22 through that particular clutch
blade and for other purposes. The present ma~ to rotate this pinion 22 and the turret ii in one
chine does not and is not designed to generate an direction. As soon as the turret III has been
exact helicoidal surface on a blade but operates
revolved to a predetermined position that par
upon a system of copyins and enlarging from ticular clutch may be deenergized and the oppo
reduced templates having the forms respectively _ site
clutch energized to rotate the pinion 22 and
of surfaces to be reproduced for each face of the
blades. The templates can be originated in any
manner or by any process forming no part of the
30 present invention and preferably may have arcu
ate surfaces the upper edges of which conform
to closely spaced portions of the desired blade
surface but upon a'reduced scale.
As the sur
faces on opposite faces of each of the blades
35 of a propeller are similar to the others, but two
templates are required for any one propeller, one
for each face of the blades.
Referring more in detail to the ?gures of the
drawings, I provide a turret ll adapted to rotate
40 about circular guideways H forming a track sur
rounding a pit l2. Preferably the circular ways
II as shown in the drawings are provided on the
upper horizontal surface of a massive concrete
foundation l3 forming the wall of the pit l2.
The excavation or pit l2 provided within the
ways II is su?lcient in diameter and depth to
accommodate the maximum size propeller W to be
?nished upon the machine presently to be de
scribed. On the turret I I are provided bearing
rollers l4 supported on and depending from the
lowermost surface, there being a number of these
rollers I! placed about the periphery of the tur
ret I II and bearing upon the upper surface of
the circular track or ways ll. These bearings
55 support the entire weight of the turret and parts
thereon. Adjacent each of these hearing or pres
sure rollers H are opposed pairs of rollers II en
gaging the outer and inner periphery respectively
of the circular ways II. By means of the ?xed
circular ways II and the rollers I4 and I! the
turret Iii may be revolved centrally above the
pit l2 about a ?xed vertical axis and with mini
mum friction.
_
In order to effect rotation of this turret Ill
65 there is provided a driving chain it loosely sur
rounding the outer surface of the circular ways
II. This chain it may be supported in position
by means of spaced angle irons ll outstanding
from and secured to the ways II. This chain
70 it is engaged by driving sprocket wheels ll, these
wheels being mounted on the lower ends of ver
tical driving shafts 19. Preferably, adjacent the
driving sprocket wheels I! for this turret III are
idler wheels or pulleys 2!! adjustable substantially
75 radially in any preferred manner as indicated in
the turret III in the opposite direction.
Between the driving pinion 23 and the sprocket
wheels I8 is a ~di?'erential mechanism 24 con
nected as shown in Figs. 1 and 3 to substantially 30
radially mounted shafts 25 extending to the pe
riphery of the turret l0 so that the load is equally
divided between the shafts 26. By suitable gear
- connections between these horizontal radial shafts
2i and the sprockets It at the lower ends of
shafts l9 and suitable controlling mechanism
which presently will be referred to, the turret l0
may be oscillated through 'dliferent angles about
_the central vertical axis of the machine as de
sired in either direction and at any desired speed.
The direction and extent of oscillation will. de
pend upon the operation of suitable switches con
trolled by electric circuits similar to those de
scribed in the above-referred to patent. As the
controlling and operating circuits, switches, etc...
for controlling the direction, speed and extent of
movement of the turret III by the above-described
connections form no part of the present inven
tion, further description is not thought necessary.
The propeller W to be machined may be mount
ed centrally within the pit or excavation I2 and
supported in ?xed position while its entire blade
surfacing operation upon one side is being com
pleted. As shown, a central shaft 26 extends
through the hub of the propeller W and has its 55
lower end resting within a conical seat in a mem
ber 21 set into the ?oor of the pit ID. The secur
ing means for the propeller are not shown or de
scribed but may be of any type facilitating re
moval and replacing of the propeller W within the 60
pit l2 in opposite or inverted position.
To eifect placing of the propeller W in its cen- _
tral position or to invert the propeller to surface
the opposite sides of its blades the turret Ill ?rst
must be lifted from its position on the guideways 65
II. This may be readily done by lifting it bodily
as by a crane, there being no clamping means
necessary to hold the turret It in operative po
sition other than its weight upon rollers I 4 and
the engagement of the rollers I5 at its periphery 70
with the surfaces of the circular ways H.
Preferably the template 30, the form of which is
to be duplicated upon a larger scale on the blade
surfaces of thepropeller, as shownin Fig. 2, maybe
built up of a plurality of arcuateplates of relatively 75
.
$199,609
thin metal such as steel sheets vertically disposed
in closely adjacent concentric positions. Each
_ plate of the template It has its upper edge cut
away so that the surface formed by upper edges
of the entire group of plates will correspond to the
3
ll so that movements radially and vertically of
the tracer will be transmitted in proper coordi
nated relation to the tool will presently be de
scribed.
‘
.
4
'
'
1
'
-
The head 31 is moved step by step to succes
surface desired to be reproduced in materially en-, ' sively di?erent radial positions after each oscil
larged form on one face of the propeller blades
being‘ ?nished. For convenience the template 30
is made materially smaller in size than the surface
10 of the propeller being finished, one-half size be-.
ing found most desirable and convenient and .
shown in the drawings for illustrative purposes.
The radial position of the template 3!], also for
15'
convenience, is chosen closer to the axis of ro
tation of the turret I 0 than the surfaces of the
propeller being, machined.
The variations in
heights of the plates of template 30 are or may
latory movement of the turret ll, each radial
movement causing the tracer 2! to contact with
the upper edge of an adjacent template plate 3|.
These movements are controlled and effected by 10
electric circuits corresponding in every way to
those for traversing and feeding the tracer and‘
tool shown and described in the above-referred
to patent. Fig. 7 shows the mechanism for mov
ing the tracer I! vertically with its slide it and 15
horizontaliyor radially on the turret II with the
slide II and head 31.
The slide 38 is provided '
with an elongated screw 38 extending longitudi
nally and secured to the slide as against endwise
20 sired, however, one scale of reduction may be and rotary movement. Engaging this screw 38 is
used for the radial and arcuate dimensions of: a nut 3| rotatable within the head or carriage 31
the template 30 relative to those of the propeller but held against axial movement by any suitable
W and the same ora different scale of reduction means. On the nut 39 are bevel gear teeth mesh
ing with, the teeth of a companion bevel gear 40.
may be used for the heights of the template sur
faces compared with the variations in height of Gear it is rotatably mounted-in the head 31 but
retained against endwise movement. To rotate
the propeller W.
'
,
The template 30 is supported in position and the gear It and thus raise or lower the tracer I!
radially disposed relative to the‘propeler W upon there is provided an elongated splined shaft 4i
within the turret l0 disposed parallel to the direc
and by means of an angularly adjustable or in
dexable arm 3|.“ The template supporting arm tion of movement of the head 31. To move the
3i may at one end he supported centrally of the carriage or head 11 radially toward and from the
propeller W and for convenience may swing about axis of the turret it there is provided an elon
the central stud or shaft 28 which passes axially gated screw 42 engaging within a nut “fixed
through the propeller hub. The outer end of the 1 within the carriage 31. Means to rotate the screw
arm 3| may be supported upon suitable roller 42 and splined shaft ll will presently be de
'
bearings 32 and 33 engaging the fixed circular scribed.
The cutting tool 45 is supported within a car
track II respectively upon its horizontal and ver
tical inner and outer surfaces. These bearings riage 40 substantially radially movable on the '
32 and 33' may be similar in every way to the turret ll, there being suitable guidéways 41 pro-4
bearings I 4 and I! respectively, there being one vided theref\or upon the upper surface of the tur
be similarly reduced relative to the variations in
height'of the surfaces being machined. If de
ret ill. To move the carriage 48 with the tool ll
or more rollers 32 resting. on the upper or hori
zontal surface of the circular track ii and one or thereon radially toward or from the axis of the
more pairs of rollers I3 engaging the inner and turret II a screw ll ‘extends substantially radi
outer surfaces. In addition suitable clamping » ally of the turret. This screw is held against axial
means (not shown) are provided for the template ‘movement within carriage 4! and. may be rotated
in either direction by means presently to be de
supporting arm 3i so that the arm ‘I and tem
scribed. The screw it is engaged by a nut ll
plate ‘30 may be secured in proper angular posi
fixed to and depending from the carriage.
tions in accordance with the blades being sur
Vertically slidable within the carriage 48 is a
faced in successive positions for corresponding
tool
supporting slide or head It. A screw ll,
surfaces on each blade. In operation upon any
extending longitudinally of the slide I0 and sup
surface of the propeller the arm ii and the tem
ported in the slide against rotation and endwise
plate 30 are retained in ?xed position. When op
movement is engaged by a nut 52 rotatably sup
eration upon the corresponding surface of an
other blade is to be started the arm II is indexed ported within the carriage 46. By rotation of
about the circular track II to a new radial or this nut ‘I through the clutch driving connec
_ angular position properly disposed for the second tions and motor‘ 53 shown in Fig. 5 the tool 4!
blade ‘and secured in that position during the may be raised and lowered. The motor 53 shown
. in Fig. 5 of the drawings controls the rotation of
cutting operation upon that surface.
The tracer 35 adapted to contact with the upper the nut 52 in either direction through oppositely
surfaces or edges of the plates forming template rotating clutches of magnetic type and driving
30 may be similar in every way to the automatic connections similar to the clutches for oscillating
electric tracer shown inFig. 16 of my above turret Ill referred to above. The direction of
rotation of the nut 52 to raise or lower the tool
referred to patent. The tracer bar or lever, how
ever, in the present instance, is in a vertical 45 is'controlled by energizing one or the other
rather than horizontal position and is secured of the clutches through the electric controlling
to a vertically movable slide ll mounted within. circuits described and shown in' my above
'
a head '31. The tracer supporting head 31 is referred to patent.
To raise and lower the tracer 35 and tool ll
movable along horizontal ways substantially .ra
dially disposed on the turret II. The means for simultaneously the motor 53 and driving means
for rotating the nut 52 are connected by gears 55 "
70 controlling the radial position of the head 31 and to a spline shaft 83 disposed parallel to the direc
the vertical position‘ of the tracer‘ slide 38 and
tracer 35 may comprise electric control circuits tion of movement of the head 46. By suitable
corresponding to those used for the same pur-. sprocket gears 84 and chain 65 spline shafts II
and '3' are rotated simultaneously relative
poses in the above-referred to patent. The con
amounts. By choosing a di?erent and longer II
nections
between
the
tracer
3i
and
cutting
tool
76
4
2,122,062
lead for the screw 5| than for the screw 88 the
vertical movement of the tool 4.5 may\ be made
greater than corresponding movements of the
tracer 85. By this meam the vertical dimensions
of the tracer 88 may be materially reduced rela
tive to the vertical heights of the propeller blades
- being surfaced.
It will be understood that by
means of controlling circuits opened and closed
by contacts on the tracer 85 the screws 88 and 55
10 will be rotated. reversed or stopped for varying
short intervals of time in accordance with the
variations in elevation of the different parts of
the template 8!.
Screws 42 and 48 controlling the radial posi
15 tions respectively of tracer 85 and tool 45 are
coupled together by sprocket wheels 85 and chain
61. By choosing proper leads for the screws 42
and 48 and different diameters for gears 58 radi'ai
movements of the tracer 85 may be reduced any
desired amount relative to corresponding move
ment of the tool 45.
.
‘As the tool carrying slide 50 and parts mounted
thereon are of considerable weight, counterbal
ancing means ‘therefor are provided. 'I'hesev
means preferably are in the form of cylinders 155
secured to the slide 50 having pistons 58 secured
to the carriage 48 on which the slide is supported.
By admitting air to the cylinders 55 above the
pistons 55 at a constant predetermined pressure
39 the vertically moving weights may be compen
sated by pneumatic pressure without adding
materially to the total weight carried by the car
riage 46.
Within the tool carrying slide 50 is a longitudi
nally disposed tool rotating shaft 58 adapted to
be rotated at relatively high speed as by a motor
59 mounted at the upper end of the slide 58.
Motor 59 may be drivingly connected to the shaft
58 by any desired gear connections (not shown)
by means of which the speed of rotation of the
shaft 58 may be controlled. The lower extreme
end of the shaft 58 is provided with a bevel gear
50 secured thereto in mesh with a bevel gear 5| on
the inner end of an obliquely extending shaft or
spindle 62 suitably supported for rotation within
the slide 50. This spindle 82 has provision at its
outer end for holding a cutter 45 such as a round
nosed milling cutter of the type usually employed
in die-sinking operations.
To limit the oscillatory movements of the turret
In there may be mounted a reversing switch ‘M
which for convenience may be mounted on the
extension of the turret l0 on which the tracer
carriage 31 operates. To operate switch ‘I8 ad
justable dogs ‘H may be provided in the path of
movement of the switch 18. Dogs ‘H may be
mounted on a bracket ‘I2 secured to the tempiate
carrying arm 3|. As shown in Fig. 7, the dogs en
gage a T-slot provided invthe upper surface of
the bracket 12 along which the dogs may be
adjusted and clamped in any position. With the
switch 10 mounted on arm 3| the turret ID will be
oscillated between proper limiting positions for
operating upon each of the blades of the propeller
for the reason that indexing of the arm 8i for
ezlich blade will correspondingly index the dogs
‘I .
Between each oscillatory movement of turret
ill the shaft 48 must be rotated to radially posi
70 tion the tracer 35 and tooi 45 to traverse dif
ferent arcuate paths over the template 30 and
' propeller W respectively. This rotary movement
of the shait 48 may be effected by a suitable
motor 14 conveniently mounted on the outer end
75 of turret l0 and connected to the shaft 53 by
means of pinion 15 on the armature‘ shaft of
motor 14 which meshes with a gear 18 secured
directly to the outer end ofshaft '48.
In operation the propeller W is‘ilrst located
within the pit l2 centrally thereof so that its 5
central axis will be vertical and coaxial with the
track ll upon which the turret J0 revolves. The.
propeller W is then secured in its central posi
tion by any appropriate means (not shown). The
turret I8 is mounted in positien upon its track ll 10
and its driving chain II, which loosely surrounds
the ?xed track I], is placed in mesh with the
driving sprocket wheels l8 and the idlers 20 ad
iusted so that the chain will frictionally engage ‘
the outside surface of the ?xed track.
15 >
The template 80 is then positioned on the
radial arm 8| and the arm placed in proper angu
lar position as shown in Fig.2with its ends respec
tively mounted on the central shaft 28 and on
the track II. The arm 8| is then adjusted to the 20
proper angular position above one of the blades
being finished so that the tracer 85 will engage a
portion of the template 88 when the tool 45 is in
position to operate on the portion of the propeller.
blade W corresponding to the portion of the tem- .25
plate engaged by the tracer.
The cutting operation can now talre place dur
ing which the turret I0 is slowly oscillated about
the track ll back and forth while the tracer 85
passes over arcs about the surface of the blade 30
being finished. After each oscillatory motion of
the turret in each direction the tracer 85 and
cutter 45 may be moved radially outward. These
oscillatory and radial movements of the tracer 85
and tool 45 alternate until the entire surface of .35
the blade has been traversed and its surface made
to conform to that of the template but upon an
enlarged scale.
To start the cutting operation on another
blade the arm 8| and the template 80 thereon 40
are indexed angularly about the axis of the tur- " ‘
ret l0 so that the template 80 will be disposed
above another blade to properly locate the tracer
35 for operation of the cutter 45 on the second
blade. This blade may then “be finished in the 45
same manner as the first blade and the remain- "
ing blades may then be successiveiy ?nished by
again indexing the arm El and oscillating the
vturret I 0 between different angular positions.
After one face of each of the blades has been 50
?nished the turret Ill is lifted o?.’ its track II and
the propelier W inverted, thus presenting the op
posite sides of the blades to the cutting tc-ol 45.
As the opposite sides of the propeller blades are
or may be of different contour this side is ?nished 55
with its own template different from and replac
ing the first template on the radial arm 8|.
What I claim is:
'
l. A propeller surfacing machine comprising in
combination,‘ means to support a propeller in}.0
fixed position, a turret mounted for rotation co
axially with said propeller, a tool carriage mov
able substantially radially on said turret, a tool
siide vertically movable on said carriage, a tracer
supporting carriage on said turret, a vertically
movable tracer therein, a model conforming to a
plurality ef arcuate contours of a blade and sup
ported in fixed pesition below said tracer, means
controlled by contact of said tracer with said .
model for raising ‘and lowering said tool slide,,7o
means to oscillate said turret during operation
of said tool, and means to move said traeer and
tool slide in predetermined relation to each other.
2. A propeller surfacing machine comprising in
combination, means to support a propeller in 75
2,192,668
fixed position, a turret mounted for rotation co-.
axially with said propeller, a tool'carriage mov
‘able substantially radially on said turret, a tool
slide vertically movable on said carriage, a tracer
6 supporting carriage on said turret, a vertically
movable tracer therein, a model conforming to a
plurality of arcuate contours of a blade and sup
ported in fixed position below said tracer, means
controlled by the contact of said tracer with the
10 model for raising and lowering said tool slide,
means to oscillate said turret during operation
of said tool, and means to periodically move said
tracer and tool slide short distances radially in
predetermined relation to each other.
15
3._ A propeller surfacing machine comprising in
combination, means to support a propeller in
?xed position, a turret mounted for rotation co
axially with said propeller, a tool carriage mov
able substantially radially on said turret, a tool
:0 slide vertically movable on said carriage, a tracer
supporting carriage on said turret, a vertically
movable tracer therein, a model conforming to a
plurality of arcuate contours of a blade and sup
ported in ?xed position below said tracer, means
:5 controlled by the contact of said tracer with the
model for raising and lowering said tool slide in
accordance with movements of said tracer, means
to oscillate said turret during movements radi—
ally of said tool to traverse said tracer and cutter
so respectively over said model and propeller, and
means to advance said tracer and cutter to suc
cessively different paths over said model and pro
peller.
4. A propeller surfacing machine comprising in
35 combination, means to mount a propeller and
cutter for relative movement whereby said cutter
may traverse the entire surface of a blade of said
propeller, a model and tracer mounted for rela
tive movement whereby said tracer always en
49 gages a portion of the model corresponding to the
portion of the propeller engaged by the cutter,
and means to advance and retract said cutter and
tracer in accordance with the contour of said
model during the traversing respectively of the
‘5 model and propeller.
5. A propeller surfacing machine comprising in
5
combination, a pit within which a propeller may
be centrally mounted and retained in fixed posi
tion, a circular track surrounding and concentric
with said pit, a turret rotatable on said track, a
rotatable cutter on said turret mounted for ra- .
dial and vertical movements, a model conforming
to a plurality of. arcuate contours of a blade and
mounted in predetermined position relative to
said propeller, a tracer mounted on said turret
for arcuate movements over said model, and
means to oscillate said turret to traverse said
cutter over the propeller.
6. A propeller surfacing machine comprising in
combination, a pit, means to centrally position
and retain a propeller therein, a circular track
surrounding said pit, a turret rotatable upon said
track coaxial with said propeller, a sprocket chain
surrounding said track. a sprocket wheel on
said turret engaging said chain, and means to
rotate said sprocket wheel in opposite direc
tions to oscillate said turret.
7. A propeller surfacing machine comprising
in combination, a pit, means to centrally position
and retain a propeller therein, a circular track
surrounding said bit, a turret rotatable upon said
track coaxial with said propeller, a sprocket chain
surrounding said track, a sprocket wheel on said
turret ' engaging said chain, adjustable idler
wheels on said turret engaging said chain where
by the chain may be tightened about said track,
and means to rotate said sprocket wheel in oppo
site directions to oscillate said turret.
8. A propeller surfacing machine comprising
in combination, a pit, means to centrally position
and retain a propeller therein, a circular track
surrounding said pit, a turret rotatable on said
track, bearing rollers on said turret contacting
with the upper surface of said track, rollers on
said turret engaging the inner and outer surfaces
of said track, a sprocket chain surrounding said
track, driving means on said turret engaging said
track for rotating said turret, and means to dis
engage said driving means from said track where
by said turret may be removed from said track.
JOHN C. SHAW.
45
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