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Oct. 22, 1946.
Filed Feb.
6, 1941
7 Sheets-Sheet l
Ar’fhgrA. Schwartz‘,
Oct. 22,1946.
A. A. scHwAR'r‘z
_ 2,409,903
Filed Feb. 6,‘ 1941
7 Sheets-Sheet 2
Ar’rhu§~A.Schwarkz, ‘
Oct. 22, 1946.
Filed Feb. 6, 1941
7 Sheets-Sheet 3‘
. _,.w
Oct._ 22, 1946.
Filed Feb. 6, 1941
7 Sheets-Sheet 4
Oct, 22, 1946.‘
Filed Feb. 6, 1941
'7 ‘Sheets-Sheet 5
. Fig.1.,
' Af’mug . Schwartz,
Oct. 22', 1946.
Filed Feb. 6, 1941
'7 Sheets-Sheet 6
Oct. 22, 1946;
Filed, Fable. ’ 1941
-7 Sheets-SheyetQ 7
ArthugASchwa?z, }
Patented Oct. 22, 1946
Arthur A. Schwartz, Buffalo, N. Y., assignor to
Bell Aircraft Corporation, Buffalo, N. Y.
Application February 6, 1941, Serial No. 377,640
4 Claims. (Cl. 90—13.2)
This invention relates to methods of handling
stock in connection with mass production of du
plicate work pieces and to machine tools for such
purposes, and more particularly to improvements
in quantity production methods and machine
tools for the purpose of shaping stock in accord
with the patterns of templets previously fur
upon the stock is similarly mounted upon the
table at a position opposite the stacked stock.
The stack of stock pieces may be rigidly mount
ed upon the work table by means of fastening
devices driven through drilled openings therein.
The routing mechanism is then moved into posi
tion over the templet and the work stack, and a
control stylus thereof is then manually guided
and caused to move relative to the templet in an
One of the objects of the invention is to provide
a simpli?ed and improved method of handling 10 improved manner to trace the outlines thereof
while the routing mechanism is operating upon
sheet stock in connection with mass production
the work pieces and duplicating’ the pattern of
operations involving multiple routing or other
the templet therein.
cutting or shaping processes. Another object of
The drawings illustrate a machine of the inven
the invention is to provide an improved machine
tool which is adapted to handle stacked sheet 15 tion as comprising a horizontal table designated
generally at 20 and including suitable support
stock pieces in connection with routing or other
ing structure designated generally at 2|. The
shaping thereof, in an improved manner. An
table supporting structure includes spaced trans
other object is to provide an improved machine
verse beams 22 upon which is mounted a central
tool which is adapted to operate from one or more
templets or patterns upon one or more stock 20 rail 23 extending longitudinally of the table. The
pieces in an improved manner. Other objects and
advantages of the invention will appear in the
speci?cation hereinafter.
Fig. 1 is a fragmentary plan of a duplicating
router portion of a machine of the invention;
Fig. 2 is an end view thereof;
Fig. 3 is an enlarged view of the centrol mech
anism of Fig. 2, with portions thereof shown in
rail 23 is provided with a tread piece 24 of hard
ened metal with an accurately ground upper face
so as to be adapted to support in smoothly rolling
relation thereon a rolling carriage portion of the
machine as will be explained hereinafter, The
table frame is provided with a Wooden table top
25 at opposite sides of the central rail 23 (Figs.
1 and 2) .
The routing mechanism includes a pair of car
riages mounted for longitudinal and transverse
movements, respectively, relative to the center rail
IV—IV of Fig. 3;
23. More speci?cally, a loWer router carriage
Fig. 5 is an enlarged view of the routing mech
30 is mounted upon the center rail tread 24 by
anism of Fig. 2;
means of mounting rollers 3| and 32 at opposite
Fig. 6 is a side elevation of the machine in the
ends of the carriage 3th. The carriage 30 in
region of the mechanism of Fig. 5;
cludes spaced parallel frame portions 33 extend
Fig. '7 is an enlarged plan view of the machine
ing transversely of the table 20 and provided
in the region of the router carriage and carriage
Fig. 4 is a fragmentary section taken along line
with stirrups 34 at overhanging end portions
thereof; the stirrups extending downwardly at
Fig. 3 is a side view of the carriage actuating
opposite sides of the table and being provided
mechanism of Fig. 7;
with rollers 35 arranged in rolling engagement
Fig. 9 is a side view of another carriage sup
with tracks 36 running longitudinally of the
porting portion of the machine;
table. Thus, the carriage 30 is ?rmly balanced
Fig. 10 is a diagram of the control mechanism
upon the table and is freely movable longi
of the router portion of the machine; and c
45 tudinally thereof. An upper carriage 40 is
actuating mechanism thereof;
Fig. 11 is a view similar to the lower portion of
Fig. 3 but on a still larger scale.
mounted so as to be freely movable upon the
frame portions 33 of the lower carriage in direc
tions transversely of the movement of the lower
In accord with the method of the invention one
carriage; and for. this purpose the upper carriage
or more sheets of stock material such as of Dural
umin or other metal as used in connection with 50 is provided with suitable rollers at ti and 42 to
engage the frame members 34 and 33, respec
the aircraft manufacturing industry, for exam
tively. A roller 44 is also carried by the carriage
ple, are mounted in vertically stacked relation
40 so as to frictionally engage the frame member
upon a horizontal table portion of the machine of
33 in the region of the routing mechanism so as
the invention, while a templet for guiding the
operations of routing or other forming processes 55 toprovide desired movements of the upper car
riage relative to the lower carriage upon appli
for control of the templet tracing operation. At
cation of power to the roller All through a driv
ing shaft d5, as will be explained more fully here
inafter. Thus, the upper carriage 65a is mounted
its lower end the tube 65 extends into association
with a bored plate ‘H mounted rigidly upon the
bracket 55; the plate 'n'l being adapted to func
tion as a stop device for limiting pivoting move
ments of the tube 65 upon the annulus 69.
A set of four control ?ngers ‘l2 are arranged
equidistantly about the collar 68 so as to extend
upon the lower carriage 36 so as to be freely mov
able relative thereto in directions transversely of
the longitudinal axis of the center rail 25, and
such movement is provided for by means of ap
plication of power to the roller 44 as will be ex
plained hereinafter.
A templet tracing device designated generally
radially therefrom in paired relation in directions
10 both longitudinally and transversely of the cen
ter rail 23. The two fingers 72 extending trans
versely of the machine and shown in Fig. 3 are
at 59 is mounted upon the upper carriage 45 at
one side of the center rail 23, and a routing device _
arranged in operative connection with corre
sponding plunger-type valves ‘l3 > which, are
designated generally at 5| is mounted upon the
upper carriage 45 so as to be poised, above the.
table 25 at an opposite side portion. thereof upon
mounted upon the bracket 57 at corresponding
opposite sides of the handle ‘it and in spaced
relation above the, plate 68. Thus, manual move
plet tracer and the router mechanisms are oper
ment of the lower handle portion ‘m of the tube
atively coupled in an improved manneras will
55. toward the right as viewed in Fig. 3, for eX
be explained hereinafter, whereby whenever the 20 ample, will result in pivotal movement of the
tracer stylus is moved so‘ as totrace the pattern
tube 65 about a horizontal axis in the plane of
of a templet disposed upon‘ the table at the left
the annulus ~69 so that the collar 68 presses
side of the. center rail as viewed in Figs. 1 and
against the valve ?nger 12' at the left side of the
2 the router device will be caused to. duplicate the
pattern‘of the templet upon workpieces which 25 control device as viewed in Fig. 3. Similarly,
movement of the handle portion 10 toward the
may be fastened down to the table at the right
left will produce corresponding movement of‘ the
which the stock pieces are mounted.
The tern- V
hand side of the. center rail thereof.
The tracing. device 59 comprises a control stylus
52 which is in the form of a tubular element
having a hardened metal pointer 53v ?xed to ex 30
tendfrom the lowerlend thereof so as to be
adapted to move against lateral edge portions
of a guiding templet as indicated. at 54 in closely
collar 88 in an. opposite direction, and such move
ments of the collar will be transmitted to the
associated valve control ?ngers. The valves .73
are arranged to separatelycontrol flow of ?uid
pressure through corresponding conduits 15 and
‘[15. which lead to-the upper carriage moving mech
anism, as will be explained,hereinafter; the con
conforming fashion (Fig. 3). The pointer 53
duits 75 and 75 being fed at opposite sides of the
is preferably proportioned so as to be. of ap
35 valves lil- by means of an inlet manifold 71 lead
proximately the same dimensions as the routing
ing from any suitable‘ source of ?uid underjpres
tool which will be referred to more speci?cally
The control stylus 52 is mounted
upon the upper carriage 55 by means of an ex
tendingbracket portion 55 thereof; the bracket
55 being bored, to mount the control stylus
device so as to extend therethrough in loosely
?ttingrelation. The stylus 52 is ?tted with a
bushing56 in the region of its mounting upon
the bracket 55, and the bracket 55 is formed with
a reduced annular shoulder 5‘! which engages
the-bushing55so as to support it thereatv against
substantial lateral movement. The bracket 55 is
also fitted with resilient compression rings 58
above and below the shoulder 53 to further sup-.
DQrtthe stylus 52 but to allow it to be oscillated
in‘, any direction about any axis within the-plane
of the shoulder 51. A pair of spacing collars
59. are mounted upon the stylus 52 above the
bracket 55 so, that the lowerone rests against
the uppermost resilient compression ring 58, and
a thimble 6B, is ?xed to the stylus 52 by means
sure, such as an air compressing or hydraulic
pumping and supply-device. The valve mem
bers 13 are spring pressed;so_ as to automatically
return to off position when pressures thereon from
the control handle ‘are released; A second pair
of valves 13' of the type describedhereinabove are
mounted at opposite sides‘of the control collar
68 so as't‘o be. disposed in a line extending longi
tudinally of the machine for operative associa
tion with corresponding control ?ngers 72 also
extending from the control tube collar .58 in
opposite directions longitudinally of the machine;
the longitudinally disposed valves 13 being ar
ranged to control flow of ?uid, under pressure
through corresponding ?uid conduits 18' and 19
(Figs. 7', 8 and 10). Theconduits ‘l8 and 1.9 are
also arranged to be fed from the inlet manifold
11 and toconvey ?uid under pressure therefrom
to the lower carriage moving mechanism tooper
ate. the latter as will also be explained morefully
portion thereof and to, be adapted to rest against
The conduits 75 and'l?; lead into. corresponding.
valve devices 85 and '85‘, respectively; which are
the upper end of theupper collar 59, thus sup
porting the stylus 52 vertically upon the bracket 60 operatively coupled with corresponding ?uid tur
bines 88 and 89, respectively. The turbines-88
of a set screw 5i so as to constitute an integral
Adjacentits upper end the stylus 52.’ is sup
ported so as to be normally concentrically dis.
posed Within an enclosing tube 55 by means of
spring ?ngers 66 extending radially within the
tube 65.
The tube 65 is suspended upon a hori
zontally disposed bracket in extending from the
upper carriagelill by means ofya collars}! which
and 89 are mountedupon the upper carriage
structure and are. operatively. connected through
suitable-gearing indicated at9ii and 9| so as to
“ be adapted, to causethe shaft 450i the roller
44 to rotate in either direction, depending upon.
whichone ofthe turbines 88 or 8,9jis inopera~
tion at any given time.' For this purpose the
is clamped about the tube 65 so astobearl against
turbinesare so arranged that admission of ?uid
metallic annulus 89 mounted upon a centrally 70 under pressure through'the conduit-'15'will cause
boredportion of the bracket?? through which
the tube 65 extends. The tube 55 is extended
below the region of the spring ?ngers 66; as at
10‘, so as to provide a convenient handle adapted
to'be grasped by'the operator of the machine
the; turbine 88"to drive‘ the gearing in such man
ner as to cause the roller 44' to move the upper,
carriage'd?lto- the right as viewed» in Figs. 1 and
2. Consequently, movement of'the'controlhan
dle i'l-il» so as- to» open the-valve "1-31 controlling the
conduit ‘I5 will cause the upper carriage to be
moved toward the right as viewed in Figs. 1
trol carriage movement in either direction longi
tudinally of the machine. Thus any unintended
shifting of the machine carriages will be unat
tended by power ampli?cation; However, upon
application of the slightest lateral pull upon the
and 2 until the control handle ‘I0 is released to
return to its normal valve-closed position under
the action of the resilient supporting members of
the handle supporting mechanism. The turbine
control handle ‘III by the operator of the ma
89 is arranged to drive the gearing in reverse di
chine the upper end of the stylus 52 will be
rection and movement of the control member so
moved in reverse direction by the interconnecting
asto actuate‘the valve ‘I3 controlling the con
?ngers ‘65, and thus the stylus 52 will be pivoted
duit' ‘I6 will thus cause the upper carriage 40 to 10 upon the lower supporting shoulder 5'! so as to
be moved toward the left as viewed in the
actuate the micrometer switch control mecha
nism I00—l03 so that the control valve mech
The conduits ‘I8 and ‘I9 lead to corresponding
anisms 85, 86, 94, 95 are actuated to allow pas
valve devices 94 and 95 which are operatively
sage of ?uid under pressure through the conduits
coupled with a pair of corresponding turbines 90 15 ‘I5--'I9 for operation of the turbine motors in
and 9‘! mounted upon the lower carriage 30. The
accord with movement of the carriages as called
turbines 95 and 91 are operatively coupled
for by such movement of the control handle 10.
through means of gearing indicated at 98 and
Thus, the micrometer switch mechanism I100—I03
99 with the roller 3! (Figs. 9 and 10) in such
is initially actuated upon application of control
manner that the turbines 95 and 91 are adapted 20 forces to the control handle ‘I0 so as to enable
to cause the roller 3I to rotate in either direc
the corresponding valve devices ‘I3 to procure the
desired corresponding movement of the carriages.
tion, depending upon which one'of the turbines
is operating at any given time, so as to cause the
Particular attention is called to the fact that the
lower carriage 30 to move longitudinally of the
control valve devices 13 are preferably of grad
machine upon the center rail 23 and side track
uate type‘whereby the rate of ?uid ?ow to the
carriage moving turbines will be regulated by
devices 36. The conduits ‘I8 and ‘I9 and the cor»
responding valve control ?ngers ‘I2 therefore are
the degree of actuation of the valve control ?n
gers ‘I2. Consequently, the harder the pull by
so arranged that movement of the control handle
the operator against the handle ‘I0 the greater
‘I0 in a direction pointing toward the top edge
of the sheet of Fig. 1, for example, will cause
will be the. de?ection of the control handle and
?uid to move under pressure through the conduit
the amount of fluid supplied to the correspond
‘I9 so as to operate the turbine 91 to drive the
ing operated turbines will be increased, and at
all times will be proportionate to the pull sup
roller 3| so as to move the lower carriage toward
the top edge of the sheet of Fig. 1, until such time
plied by the operator to the handle ‘I0. However,
as the control pressure upon the handle 70 is 35 in the event that the carriage movement so pro
released. Reversely, the control valve device in
cured causes the templet pointer 53 to bear too
strongly laterally ‘against the opposing guiding
connection with the conduit ‘I8 is so arranged
templet the stylus 52 will thus be caused to pivot
that movement of the control handle ‘I0 toward
back upon the shoulder 51 of the bracket 55
the bottom of the sheet of Fig. 1 will cause the
lower carriage 30 to move toward the bottom edge 40 against the action of the spring ?ngers 65, thus
causing the thimble 60 to move laterally so as
of the sheet of Fig. 1 until the control pressure
to return the previously actuated micrometer
upon the handle 10 is relieved.
switch or switches into off position. The mi
The valve devices 85‘, 85, ‘94 and 95 are arranged
crometer switch thereby causes the corresponding
to be normally closed but are equipped with
electric solenoid actuating devices (Fig 10) which 45 solenoid valve control device to be operated to
close the corresponding element of the valve
are arranged to ‘be actuated to valve open posi
mechanism 85, 86, 94, 95, thereby cutting off the
tions in response to relative lateral movement be
supply of ?uid pressure power to the correspond
tween the control stylus 52 and the tube 65. For
ing turbine even though the control handle ‘I0
example, as illustrated in Figs. 5 and 6, a pair of
may at the time be pressed into valve actuating
micrometer switches I00 and IM are mounted
position by the operator of the machine.
upon the carriage 40 at opposite sides of the
It will be understood that whereas the control
thimble 60 and to extend radially therefrom in a
line transversely of the longitudinal axis of the
valve devices ‘I3 and the micrometer switch devices I00 to I03 are arranged radially of the as_
machine, whereby movements of the thimble 60
sooiated control elements in directions longitudi
in either transverse direction will cause the cor
nally and transversely of the machine and at
responding micrometer switch to actuate an as
right angles to one another, control movements
sociated electrical circuit leading to the corre
of the control handle 10 and/or of the pointer 53,
sponding solenoid device of the turbine control
valve mechanism. The control mechanism is so
as explained hereinabove, in directions diago
arranged that as long as the stylus 52 remains in 60 nally thereto will result in simultaneous actu
ation of corresponding adjacent control devices
neutral or concentrically disposed relation within
so as to provide a composition of control effects
the control tube 65 the micrometer switches I00
whereby the router carriage wil1 move in a cor
and I 0! will not be actuated, ‘and the correspond
responding diagonal direction.
ing turbine control valves 85 and 86 will remain
A router head H0 is poised above the stock
in closed condition.
As in the case of the arrangement of the con
II I (Figs. 5 and 6), and for this purpose the head
H0 is mounted upon the upper carriage 40 so as
trol valve devices 13 as explained hereinabove, a
to be vertically slidable thereon by means of a
similar second pair of micrometer switches I02
and I03 is arranged radially at opposite sides of
slide connection at II 2. The upper end of the
the thimble 60 in a line‘ extending longitudinally 70 head H0 is connected through means of a link
I I4‘ to a bell crank I I5 which is pivotally mount
of the machine (Figs. 4 and 10), and are opera
ed at H6 upon the upper carriage for operation
tively coupled with the turbine control valves
by a push-pull rod II‘I (Fig. 5). Rod II‘I con
94-95 so that any pivotal movement of the
nects at its other end (Fig. 3) to control lever
stylus 52 within the control tube 65 in directions
longitudinally of the machine will similarly con 75 I I8 which is also pivotally mounted upon thecar
riage 11m» bymeans of a pivotal connection H9.
The lever H8 is located Within convenientreach
of the operator of the tracer control handlel't?,
vention it will no longer be necessary to form
laterally projecting ears or other temporary ac
cessory fastening means at the side edge portions
of the work sheets in order to enable them to be
and'thusv convenient means. are provided where
by :the operator may.‘ raise and lower the routing
mechanism into and out of operative position
relative to the work.
It will be understood. that the router head' Hill
is adapted to be ?tted with any desired type. of
?xed against lateral displacement during the
routing operation, thus eliminating extra form-_
ing and handling operations. It will also‘ beun
terminate the supply. of carriage moving power
mounting a shaping control tracer in registry
derstood that the routine of handling the work
sheets in connection with the method of the in
routing or work cutting tool. as .at I20, and that 10' vention is so simpli?ed as compared to methods
suitable motor or other power supplying-means
of the prior art that substantial economies. are
will be operatively coupled with the router toolv
thus made available to the user of the machine.
and controlled by any suitable control device, as
Because of the features of the carriage and
willbe well understood‘by thoseversed in the
routing actuating mechanisms full cutting speed
is obtainable at all times Without fatiguing the
Thus, a novel and improved templetfollowing
operators. The cutter feed is smooth and posi
machine tool is provided wherein the machining
tive and fool-proof against mistakes in judgment
element of the mechanism is adapted to auto
by the operators who are at all times protected
matically duplicate every movement of the tem
from flying chips or. other dangerous in?uences.
plet tracing pointer thereof, and wherein suit- In
Although only one form of the invention has
able movements of the carriage relative to the
been shown and described in detail, it will be
guiding templet and the work are obtained by
apparent to those skilled in the art that the in
manual application of only minor pressure forces
vention is not so limited but that various changes
against the control device thereof because of am
may be made thereinwithout departing from the
pli?cation thereof by automatically applied power - spirit of the invention or the scope of the ap
pended claims.
means. However, the machine is prevented from
moving with disruptive or template-overrunning
What is claimed is:
1. A duplicating shaping tool including a tem
effects-as a result of mistakes of judgment by the
operator thereof by operation of automatically
plet and stock piece supporting platform, a car_
applied power cut-off controlsgwhich function to
riage movable relative to said platform and
whenever the templet tracer is brought to bear
with the contours of templet means to' be traced,
unwisellr against the templet guiding surfaces,
work shaping means mounted upon said carriage
in ?xed relation therefrom and adapted to dupli
Thus, the machine of the invention provides
mechanism whereby mass production of duplicate 35 cate contours of said templet when traced by said
sheet metal products may be eifected in accord
tracer, carriage movement control means. com
with a simplified and economical and otherwise
improved operating method. The sheet metal
stock pieces may be initially stacked in super
posed relation at one side of the- table while one
or more templets for guiding the routing. oper
ations thereon are mounted on the table opposite
ly of the center rail thereof.
Thestacked work sheets as explained herein
above may then be Secured to the table against
lateral displacement from their prearranged
aligned stackedposition by means of nails or
screws or other suitable fastening devices driven
through drilled openings and into the supporting
table. Then the routing mechanism carriage i
structure of the machine may be manually di
rected to move so that the routing guide tracer
follows the guiding contour- of the templetiand
the routing cutter correspondingly moves rela
tive to the work sheets while cutting the latter.
Manually controlled means for raising and low
ering the" cutter relative to operative elevation
is provided in conjunction with the carriage guid
ing control device. Movement of the router car
riage is provided for in all directions within a 60
plane parallel to the table top, and such move
ment is effected by manual guiding of a control
handle which is operatively couplediwith selec
tively applicable power means adapted .to be au
tomatically actuated to amplify the carriage mov
prising a lever mounted upon said carriage adapt
ed to be manually urged in the desired direction
of carriage movement for partially providing
movement thereof relative to said platform, pow
er supply means operatively coupled with said
carriage for assisting movement of said carriage
relative. to said platform, said power supply
means being controlled by movements of said
control lever relative to said carriage under forces
applied manually thereto to complement said‘
manually applied carriage ‘moving forces, and
control means operatively associated with said
tracer and said power supply means for inter
rupting operation of the latter whenever said.
manually directed forces tend to move said car
riage in such’ manner that said tracer bears nor
mally against templet contoured portions.
2. In a machine tool, a ?xed base, a carriage
movably mounted uponsaid base, a control momber‘ comprising a tubular element flexibly mount
ed upon said carriage for transmitting. manually
applied pressure forces therethrough to cause
said carriage to move relative to said ?xed base,
power supply means operably associated with
said'oarriage for complementing‘ the carriage
moving forces manually imposed upon said con
and until such time as such control forces may
trol‘member, power'supply control means oper
atively connected with said control-member so
as to be automatically actuated. upon‘ movement
of said control member relative to said. carriage
away from control? member normal position rela
be ill advisedly applied by the operator‘laterally
against the templet, whereupon the power am
plifying means is automatically. cut off. Thus,
so-called “hunting” operation of the duplicating
routing mechanism is avoided, and the mecha
tive to said carriage, atemplet contacting tracer
?xed to an extending end portion. of-a member
extending within the interior of said tubular
member and resiliently'mounted in laterally mov-~
able relation therein by resilient mounting means,
ing forces appliedthereto by ‘the operator unless
nism is fool-proof as to its control ‘and operation'
said tracer extending member being operatively
It will be understood‘that by reason of the fea
associated with second control means. adapted. tov
tures'of the method-and mechanism of the in 75 control the operationof said power supply means
in such manner that whenever said control mem
bar is shifted out of axial alignment with the nor
mal attitude of said tracer extending member
said power supply means is operated to assist
the manually applied forces acting upon said
control member.
applied thereto through said control element, and
second motor control means mounted upon said
carriage and in registry with said control ele
ment for actuation thereby to adjustably control '
the power output of said motor means in accord
with adjustable actuation of said second power
3. A machine tool including a stationary por
control means in accord with the magnitudes of
tion and a carriage portion movable relative
pressure forces applied manually to said control
thereto, carriage movement control means flex
ibly mounted upon said carriage and comprising
4. A duplicating machine tool comprising a
a manually operable control element movably
base, a carriage mounted for movement relative
mounted upon said carriage and adapted to be
to said base, motor means operatively coupling
submitted to manually applied forces for moving
said base and said carriage for assisting in such
said control element relative to said carriage and
relative movement, a manually operable control
simultaneously transmitting said manually ap
member movably mounted upon said carriage and
plied forces to said carriage for urging the latter
normally disposed in neutral control position
to move relative to said stationary portion, a guide
relative thereto by resilient mounting means, mo
contact member movably mounted upon said car
tor control means mounted upon said carriage
riage and normally maintained in a neutral posi
adjacent said control member for actuation
tion by resilient means and having a portion ex
tending into engagement with said control ele 20 thereby upon de?ection of said control member
from said neutral position, a tracer adapted to
ment, motor means operatively coupled with said
contact carriage movement guiding templet
stationary portion and said carriage for provid
means mounted upon said base upon movement
ing relative movement therebetween, motor con
of said carriage relative to said base, said tracer
trol means mounted upon said carriage and in
registry with said guide contact member and op 25 being movable relative to said carriage upon im
pact of said tracer against said templet, and
eratively coupled with said motor means for
second motor control means mounted upon said
causing the latter to move said carriage in direc
carriage adjacent said tracer and adapted to be
tions consonant with the direction of applica
actuated by movement of the latter relative to
tion of forces applied manually to said control
element as long as said guide contact'member is 30 said carriage between motor operative ‘and in
operative control conditions.
disposed away from said neutral position relative
to said carriage in response to de?ection forces
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