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Патент USA US3083353

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March 26, 1963
Filed Oct. 24, 1960
2 Sheets—Sheet 1
a \
March 26, 1963
Filed Oct. 24. 1960
2 Sheets-Sheet 2
1477'044/5 y
United States Patent
Patented Mar. 26, 1963
Referring to the drawings:
FIGURE 1 is a schematic drawing of the barometric
Arthur H. Le Fehvre, Westwood, N..I., assignor to The
Bendix Corporation, Teterboro, N.J., a corporation of
altitude control mechanism forming the subject matter
the craft ?ight at a predetermined altitude level as dis
A solenoid operated clamping device 11 is so arranged as
of the-invention.
FIGURE 2 is a schematic perspective view of the struc
ture of the barometric altitude control device embodying
the invention.
Filed Oct. 24, 1960, Ser. No. 64,548
_Referring to the drawings of FIGURES 1 and 2, there
4 Claims. (Cl. 336-39)
is provided an evacuated bellows or diaphragm assembly
The invention relates to an improved barometric altitude 10 1 responsive to a change in ?uid pressure within a housing
sensitive signal control mechanism for generating an
2 which is sealed and vented to the atmospheric altitude
electrical signal in response to changes in ambient at
pressure, as shown schematically in FIGURE 1.
mospheric pressure and more particularly to a novel in
In the aforenoted arrangement, the evacuated dia_
strument adapted for use in controlling an automatic pilot
phragm assembly 1 transmits motion through rods 3 and
or aircraft altitude control system for operating the ele 15 5 slidably positioned in supporting bearings 7 and 9
vator surface of an aircraft so as to automatically maintain
mounted at opposite ends of the diaphragm assembly 1.
closed and claimed in U.S. Patent No. 2,512,902, granted
to clamp one end of the rod 5 and includes clamping arms
June 27, 1950, to F. Henry S. Rossire and assigned to
‘12 and 13. The arm 12 is pivotally connected to the arm
Bendix Aviation Corporation, now by change of name 20 13 by a pin 15 and operated by energization of a suitable
The Bendix Corporation.
solenoid 17 to effectively clamp the rod 5 between the
An object of the invention is to provide a novel baro~
arms 12 and 13.
metric altitude control device which will furnish a signal
The rod 3 at the opposite end of the diaphragm as
proportional to a deviation from a preselected altitude and
sembly 1 is opcratively connected to a lever 24 through an
a device in which the preselected altitude may be varied 25 over travel spring device 25 which is arranged to limit the
at the will of the operator throughout the range of opera
magnitude of the mechanical signal that may be directed
tion of the mechanism.
through the lever 24 to a signal generator or electrical
Another object of the invention is to provide in such a
position transducer 27 operatively connected at one end
barometric altitude control device a novel operator-opera
of the lever 24 so as to provide an electrical control sig
tive means for alternately clamping and freeing either 30 nal upon a change in altitude from the preselected value
end of an evacuated diaphragm assembly to provide for
effectively positioning the transducer 27 to one side or the
the required signal output.
Another object of the invention is to provide in such a
barometric altitude control device novel means whereby
the sensing device may operate about a ?xed null point so
other of a null signal position. The lever 24 pivots about
a pivot pin 31 positioned intermediate the opposite ends
of the lever 24-‘ and so arranged as to produce an ampli?ca
tion of the mechanical motion to the transducer 27.
At the opposite end of the lever 24 from the transducer
27, there is mounted a pin 33 with which there is arranged
long as the mechanism is in operative relation with the
accompanying control system or automatic pilot of an
in cooperative relation a centering and locking mechanism
aircraft and in which the arrangement is such that when
the sensing device is disengaged from the accompanying
36. The mechanism 36 includes arms 38 and 4t) pivoted
system the sensing device is free to assume its normal 40 at 42 and 44 respectively and biased by spring 46 against
a ?xed pin 48 and the pin 33 on lever 24-‘ so as to center
position relative to the barometric altitude without affect
the lever 24 and lock the lever 24 in a position correspond
ing the null position of the sensing device which is there—
ing to the electrical null position of the transducer 27'
upon locked in the null position.
upon deenergization of a control solenoid 50. Upon en
Another object of the invention is to provide a novel
barometric altitude control mechanism having a sensing 45 ergization of the solenoid 50 the arms 38‘ and 40 are
biased outwardly against the force of the spring 46 so as
device to provide an electrical signal proportional to dia
to release the pin 33‘ on the arm 24 for free movement.
phragm assembly movement effected by changes in baro
The solenoid 17 for operating the clamp mechanism
metric altitude and a device in which there is provided an
11 and the solenoid 50‘ for operating the centering and
evacuated bellows or diaphragm assembly having control
and supporting rods slidably mounted in bearings at op~ 50 locking device 36 are serially connected and energized
from the same source of electrical energy indicated dia
posite ends thereof and including a solenoid operated
grammatically in FIGURE ‘2 as a battery 52 controlled by
clamping device to provide a means for locking the sup
an operator-operative switch 54 so that upon the opening
porting rod at one end of the diaphragm'assembly when
of the switch 54 deenergizing the respective control sole
the solenoid is energized, together with a second solenoid
actuated centering mechanism rendered effective upon de 55 noids 17 and 50, the clamp 11 is freed from red 5 while
rod 3 is centered and locked by the action of the centering
energization thereof to lock in a null signal position an
and locking mechanism 36 acting on the lever arm 24.
electrical signal device normally operated by the control
In this deenergized condition a change in the ?uid pressure
rod at the opposite end of the diaphragm assembly, the
within the housing effecting the diaphragm assembly 1
locking mechanism acting to free the control red at the
opposite end of the diaphragm assembly when the ?rst 60 will result in a corresponding change in the length of the
diaphragm assembly 1 causing rod 5 to move through the
mentioned solenoid is energized, the arrangement being
bearing 9 and free of the clamping device 11.
such that the ?rst and second mentioned solenoids are
In the aforenoted arrangement, when the accompanying
serially controlled from the same electrical source by the
autopilot system of a type such as disclosed in U.S.
operator of the device.
These and other objects and features of the invention 65 Patent No. 2,512,902, is to be controlled to a constant
altitude, the solenoid 17 operating the clamp 11 and the
are pointed out in the following description in terms of
solenoid 59 operating the centering and locking device
the embodiment thereof which is shown in the accompany
36 will be energized by the operator closing the switch
ing drawings. It is to be understood, however, that the
54, when the desired altitude is reached. In this latter
drawings are for the purpose of illustration only and are
mode of operation the clamping device 11 will then clamp
not a de?nition of the limits of the invention, reference
rod 5 and anchor that end of the diaphragm assembly 1
being had to the appended claims for this purpose.
while the centering and locking mechanism 36 will be
clamping'device operative and said centering device‘ in-‘
tion of rod‘3 to'be ‘transmitted to the sensing‘transducer
27 through the lever 24. In such operation, the lever
24 will pivot about pivot point 31 producing an ampli?ca
tion of the mechanical motion‘ ‘to thetr‘an‘sdu'cer 27. The
over travel'spri'ng' devic'eQ'S, included‘inv the attachment
operative and alternately operable in another sense to
render said clamping device inoperative so as to release
said supporting rod While rendering said centering device
operative to engage said connecting-means so as to center
said generator in said n0n~signal generating position
whereupon said diaphragm assembly may-move said sup»
portingirod free of said clamping ‘device with changes in
of ‘the rod '3‘ ‘to the'lev‘e'r“24," acts‘ to‘ limit the‘ magnitude
of the mechanical signal that maybe directedtol the signal
transducer 27.
When'thé operator‘ desires to“change‘to‘ another mode
operative means operable in one sense to render said
actuated so as to free pin 33 on lever 24- and allow the mo
of control of the autopilot system, the solenoid‘17 operat-‘
ing the vclampll'arid the solenoid 50‘operating the center
ing and locking mechanism 36 are deenergized. Upon‘de
energiz'ation'of ‘the solenoid ‘50" the spring 46 ‘of they center-'
ing and'lo'cking. mechanism>36 forces arms 38‘and 40‘ 415
against» the ?xed ‘pin‘48 and‘th'e pin‘33 ‘on‘le‘ver 24 center
ing lever 24 “and locking-it‘ in a position c-orr‘esponding'to
the electrical null signal position -of the? transducer 27.
At the'same‘time'the solenoid‘ 17 is deen‘erg‘ized where
upon‘ the clamping device -11 is "freed from“ rod *STallowingl‘
changes in lengtli~of ‘the diaphragm assembly‘l to be‘
absorbed by' ‘free‘m‘otion- of the‘rOd‘S.‘
In the afore‘described mechanism, the arrangement of
the prevailing atmospheric pressure without changingthe
position of the signal generator held in said. non-signal
generating position by the engagement of~said connecting
means by said centering device.
2. The'improvement de?ned by:claim>1 in‘whichi-said
connectingmeans includes a pivoted lever' operatively ‘
connected to said signal‘generator and engageablebysaid'v
centering device. =
3. The improvement de?ned'by claim 1‘ in which said‘
connecting means" includes a‘ pivoted lever operatively’
connected to said signal generator andengageable by said'
centering device,’ and 'an'over‘travel spring device operaw
tively connecting the controljrodiand thereby’the- diaphragm assembly to said lever‘ for operating-said'signall
generator‘ upon said“ centering'device being inoperative
the assembledlel‘ements is such'that motion of ‘the dia-'
phragm assembly 1 ‘ during'deenergization' of the‘ control 25 to engage said lever.
4.‘ A'barometric altitude‘sensitive signal“ control mecha
ling solenoids -17' and~50 -will not effect the ‘positively posi
nism comprising, in' combination, a movable electrical‘
tioned electrical null of the signal generator "or transducer
signal' generator having a null‘ signal ‘generating position,
27. Thus,‘ when‘the controlling solenoids 17 and 50 are
an evacuated bellows‘responsive‘to ambient atmospheric
once again energized by‘ the‘closing of switch 54, there
will be 'therebyselecte'd‘a controlling altitude ‘correspond 30
ingf‘to the then‘p‘rev‘ailing" altitude of the aircraft; There
after,-contr'ol~ of‘the autopilot‘ system‘ will be‘ effected‘
through a signal‘ from the transducer'27 proportional to”
the change in'altitude‘from that of such preselected'altitude
over a relatively‘ narrow range about‘the null position. 35
The controlling signaltrom‘the?transducer 27 may be’
applied to anaircraft control system or may in‘ turn be
ampli?ed through a suitable electric ampli?er‘ for" use.
pressure, a control‘rod connected‘ to one end of Isaidv bel—
lows, a supporting rod~ connected to‘ an opposite end ‘oi?t
said bellows,‘ a bearing for slidably mounting the control
rod, another bearingfor slidably‘mounting the=supportingy
rod, a‘ pivoted lever including an over "travel spring‘mea‘nSJ
fo‘r‘operativelyv connecting the control 'rodito‘said lever,
one .end of said lever being operatively connected-to said-r
movable‘ electrical signal generator, a/centering‘ device
operable to engage an‘ opposite'end of said lever so as to
center and‘ hold' the the movable electrical'signal‘ gen-i
in a conventional manner ‘in‘the‘con'trol‘of the altitude of“
an aircraft or‘ missile, as‘ the case‘ may be, to- the‘ pre 40 erator in' the ‘null’ signal‘position, a releasable clamping
device" operable to secure said supportingrod' and there-»
selected" altitude‘, as‘ explained,‘ in’ the aforementioned‘
by saidbellowsin an operative position relativeto‘said?
U.S.' Patent No. 2,512,902.
Although only oneve'inbodiment of‘ the inventiOn has‘
lever, operator-operative means" operable' in: one‘ sense'
to render'said clamping ‘device operative? and ‘said center»
been'illustrated and described, various changes in the
form‘and relative arrangements of the parts, which will 45 ing' ‘device imperative, and said‘ operator-operativemeans :
operabletinanother sense to render said clamping? device
now appear to those skilled in ‘the art may be made with- ‘
inoperative so as to release said supporting‘rodiwhilef
out departing from‘ the scope'of the invention. Reference
rendering said centering’deviceoperative to'engage‘ said“
is, therefore, tobe‘had' to ‘the appendedclaims for-a de
oppositeend. of said lever so as'to center“ and'l'hold the»
?ni’t'ionv of the limits of " the invention‘.
Wh‘at is claimed is:
generator in ‘said null signal generating position’ where
upon said bellows may move said supportingrod free=ofi
said clamping'device with changes in the ambient atmos-»
non-‘signal generating position, a diaphragm“ assembly
pheric pressure without changing the position of the sig
responsive to ambient atmospheric pressure changes due,
nal generator held in saidnull signal generating‘po'siti'on
to changes in‘ an aircraft altitude level, a control rod con 55 by the engagement of ‘said opposite end ‘ofjthelever by said '
nected to one end of ‘said‘dia‘phr‘agm assembly,,a support
centering device. .
1.~ Ina-a mechanism of a' type including a movable signal '
generator, a device operable‘to' center said ‘generator in‘ a
ing rod ‘connected to an opposite end of said diaphragm
assembly} and means for 'operatively connecting said con‘
References Cited'in the-?le of thislpatent
trol rod andther‘eby said diaphragmlassembly to said sig
n‘aligenerato‘r; theimp‘rov‘ement comprising a releasablev 60
Rossire ______________ __ June 27,
clamping device operable to secure said supporting. rod
and thereby said diaphragm assembly in an operative‘
Rossire ______________ __ Oct. 27,
position relative to said signal‘ generator, and- operator
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