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Патент USA US2408068

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Sept._ 24, 1946.
H. A. HERZIG
INERTIA ABSORBER
'Filed Nov. 30, 1943
2,408,057,
,
2,408,057
Patented Sept. 24, 1946l
UNITED "STA-TES. ' PATENT OFFICE „
Henry A.- Herzig, Port Washington, N. Y., assignor
to Sperry Gyroscope Company,l Inc., a corpo
ration of New York
v Application November 30, 1943,'Serial No. 512,319
( Cl. 192-4)
6 Claims.
l
the sine langles kover a complete 360° range. In
other cases, it is `,necessary to move the cam in
one direction from.0.° to 90°, then reverse the cam
and move `it inthe opposite directionfromf90°
This invention concerns an inertia absorbing ` `
device for use with a reversing mechanism to
absorb the inertia of a load vduring operation of ,
the reversing mechanism, thereby relieving the
_driving apparatus from inertia forces occurring
`when theV direction of the load is reversed.
,
to 180°.
i
.
The present invention is particularly `useful
inconnection-with the latter type. of mechanism.
' A major object of the invention is to provide a
Since the speed of movement of the cam remains
mechanism operable synchronously with a revers
constant, providing the rate of change of the
ing mechanism for absorbing the inertia of a load
during the reversing operation.
.
Y f
10 input angle is constant, but only the direction of
the output is changed, any mechanical load
AnotherV object of the invention is to provide
driven by the output of the cam mustbereversed
an inertia absorber actuated synchronously with
from a given speed invone direction to the same
an intermittently. operated reversing mechanism
speed in an opposite direction.> Obviouslythis
for stopping movement of an output member to`
places a very heavy load on the computing device.
absorb the inertia of Va loadv during the reversing
operation.
Y
According to the present invention, the inertia
g
absorber operates synchronously with the re
versal of direction toabsorb the inertia of the
load independently of the computing device. As
A further` object of the invention is to provide
a computing mechanism with an inertia, absorber
actuated synchronously with an intermittently
operable reversing mechanism to absorb the in
20
ertia of the load driven by the computing mecha
nism during the reversing operation.
Other objects and advantages will become ap
parent from the following specification taken in
connection
with
the
accompanying drawing, A f
appliedto a trigonometric computing device, the
reversing mechanism operates intermittently for
each 90° change in the input angle. The `inertia
absorber, in Vthe form of a stop cooperating with
thev output shaft, operates synchronously with
the operation of theì reversing mechanism to ar
' i ’ restA movement of the output shaft thereby ab
wherein
' Fig. 1 is a perspective View of a sine computing
sorbing the inertia of the load without interfer
ing with the normal operation ‘of the computing
mechanism embodying the invention in a pre
ferred form, somevparts being broken away for
purposes of clearness;
.
Fig. 2 is a side elevation of the stop mechanism
in Fig. 1 showing the stop members positioned
device.
-„3.0
-for stopping rotation ofthe output shaft in one
.
The _invention is illustrated inthe drawing as
applied toay sine computing unit utilizing a pin
cam which is rotated according »to any given
angle, and drives an output shaft according to
' the sine of the inputvangle. Thev direction of
Fig. 3 is a similar side elevation of the stop .3_5 rotation of the pin cam must be changed for
mechanism, but showing the stop members'posi- - > each ninety degrees of the input angle. Obvious
Etioned for stopping rotation ofthe output shaft
ly, the output member and its load is reversedat
in the opposite direction.
i
Y y
the same time. Without the provision of the
inertia absorber, the pins`on the cam would have
The present >invention is particularly useful
in Aconnection with trigonometric computing de 40 to absorb the inertia forces of the load which are
vices such as those for computing a, particular
>quite large when it is realized that under certain
trigonometric function of .an angle. One device
conditions, the entire apparatus changes from a
given speed in one direction to a corresponding
for determining the trigonometric function of
speed in the opposite direction.
an angle is a cam Which may be rotated, or vother
direction; and
y
"
Y
'
wisemoved, according to a particular angle, By
As shown in Fig._1, an input shaft Il is driven '
properly laying out the surface of the cam, it
may‘move a follower 'according to any predeter
mined function of the angle according to which
the cam is rotated.
according to an angle the sine of which it is de
sired to compute.
of a`v sight for use in aiming guns or other objects
c
For example, from trigonometry?it is known
50
that the sine value _of an angle increases from ~
zero to unity for anglesv of from Ojto 90 degrees,
Such al device may for ex
ample be driven according to the azimuth angle
toward a given target. In such a case, the sight
may be'co'ntinuo‘u'sly rotated in one `direction for
any number of revolutions, or it may be rotated
ñrst in one direction and then in the opposite
direction. >In any case, the shaft ll is constantly
sible .to provide a cam surface which will compute V55 positioned ,according to the azimuth angle as
` and decreases from unity to zero for angles be
tween 90 and >180 degrees.V It is sometimes pos
2,408,067
3
carries a gear I2 which meshes with a driving
gear I3 on a sleeve I4 that is rotatable on, and
The pins 35 on the pin cam 34 drive a follower
gear 61 that is mounted on a square shaft (it
shiftable longitudinally of a shaft I5. Clutch
engaging members I1 .and I5, driven by the sleeve
- I4,
4
each ninety degrees of the input angle repre
sented by the position of shaft II.
measured from a given reference. The shaft II
and is slidable longitudinally thereof.
In order
to support the follower gear 61, a guide rod 59
may -be arranged to engage a guide member 1I
are adapted to mesh with corresponding
clutch members IS and 20 on gears 2| and 22,
respectively, which are also rotatable on the
slidable on the square shaft 68 to guide movement
of the follower gear 61 as it slides along the shaft
58 to follow the spirally arranged pins 36.
The shaft 68 `drives through gears 12 and 13
to rotate an output shaft 14 which may be uti
lized to drive` any desired load represented dia
grammatically at 15.v A stop member 11, in the
vshaft I5.
' The gear 2|, when the clutch members I1 and
I9 are engaged, drives through gear 23 on shaft
24 which rotates gear 25 to drive a broad-faced
gear 25. The gear 25 is keyed to shaft 21 to
drive bevel gear 25 which operates through bevel
gear 29, shaft 3| and pinion 32 that meshes with 15 form> of a segmental projection, is mounted on
the shaft 14 and is adapted to engage aninter
a gear 33 on the periphery of a pin cam 34.
ittently actuated stop 19 which is mounted on
When the clutch members I8 and 20 are en
gaged, as by shifting of the sleeve I4, the gear
a shaft BI for intermittent movement synchro
nously with the operation of the reversing mech
22 drives directly through the gear 25 and shaft
21 to rotate pinion 32 in the opposite direction 20 anism to stop rotation of the output shaft 14 as
well as movement of the load 15.
to its previous direction of rotation, whereby the
The mechanism for intermittently actuating
`direction of` rotation of pin cam 34A is reversed.
the stop 19 consists of a Geneva accumulator
As shown in the drawing, pins 5,5 on the face
of the pin cam 34 are arranged in spiral fashion
mechanism 83 that is similar to the accumulator
to provide the desired sine function.
25 50 previously described. It consists of al series
of Geneva mechanisms carried on parallel shafts
The reversing mechanism is actuated, as will
84 and 35. The input of the Geneva accumulator
be explained, according to the position of the in
put shaft II, whereupon the, `sleeve I4 is shifted
83 isvdriven from shaft 14 asV by gears 86 and 81,
which rotate segmental gear 88 and locking disc
longitudinally of the shaft I5 to cause the shaft
EI to drive the pin cam `(t4 in one direction. or 30 89, which cooperate with Geneva gear 9| on shaft
85, to intermittently'rotate segmental gear 92 and
locking disc 53 of a `second Geneva mechanism.
The segmental gear 92 rotates Geneva gear S3 on
another, depending upon the angular input rep
resented by the shaft II. As previously pointed
out, the ydirection of rotation of pin cam 34 must
the shaft 84, that drives segmental gear S4 and
be reversed for each ninety degree change in
the input angle; that is, the Pin cam 34 is driven 35 locking disc 95 which operate a Geneva gear 86
on the shaft 85. This Geneva gear 9‘6 drives-still
in one direction for an input angle of from 0°
another segmental gear 91 and locking disc 93
to 90°, but reversed for angles from 90° to 180°.
This .procedure continues for each-ninety degree
which operate a Geneva gear 99 on the shaft
54. rï‘his lat-ter Geneva gear intermittently ro
change in the input angle.
In order to operate the reversing mechanism 40 tates segmental gear IUI and locking disc |02,
which cooperate with Geneva gear |03 to inter
at each ninety degree angle, the input shaftk II
mittently turn spur gear |05 on the shaft 85.
has a bevel gear 4I meshing with a bevel gear 42
From this `description it will be apparent that
that is freely rotatable on shaft 43 and drives
the Geneva accumulator 33 is driven by the out
a gear 44 which, in turn, ro'tatesa gear 45 that
is rotatable on a shaft ¿Iii` arranged parallel to 45 put shaft 14 and operates to intermittently turn
the gear |05 through approximately one quarter
the shaft 43. The gear 45 operates through a
of a, revolution for a given number of revolutions
Geneva accumulator mechanism, designated
of the output shaft 14. The gear |05 drives
generally at 50, which intermittently turns the
through idle gears |01 and |08 to turn a gear
shaft 45. The shaft 45 thus turns reversing
member 5I which engages collars 52 and 53 on 50 |09 which is ñxed to the stop 19 on the shaft
5I. In this manner, the stop 19 is also intermit
the sleeve I4 to shift the sleeve together with
tently turned through approximately one fourth
the driving gear I3 longitudinally of the shaft
of a revolution for a given number of revolutions
I5. lThe gear 45 is keyed to a segment gear 41
of the output shaft 14.
and a locking disc 48 which cooperate in a con
When the output shaft 14 is rotated in a coun
ventional manner with teeth 49, 49 to intermit 55
tently turn Geneva gear 55.
terclockwise direction, as shown by the arrow
The Geneva gear 55 is fixed to another seg
ment 55 and locking Adisc 51 to intermittently
operate Geneva gear 58, whiche in turn, operates
another Geneva mechanism vincluding segment
gear 59, locking disc 6| and gear 62. The gear
52 also actuates a Geneva mechanism including
segment gear 53, locking disc 54 and gear 65,
which is fixed on shaft 45. By appropriately ar
ranging the gear ratios of the driving gear and
the Geneva accumulator mechanism, it is pos
sible to turn the shaft 46 through an angle of
180° to actuate the reversing member 5I thereby
reversing the direction of the drive for the pin
cam 34. As shown in the drawing, the reversing
member 5I is turned through 180° in two steps
of one-fourth of a revolution each lfor each ninety
degree change in the input angle. The reversing
in Figs. 1 and 2, the stop 19 is intermittently
turned in a clockwise direction until the output
‘ shaft 14 reaches a position at which thev reversing
60 mechanism is actuated to reverse the direction
of movement of the pin cam k34. At this instant,
the stop 19 is operated by the Geneva mechanism
83 to move from position A, as shown in dotted
line in Fig. 2, 'to position B, where it engages the
65 segmental stop engaging member 11'.
As the stop engaging member 11 contacts> the
stop 19, the inertia of the load 15 is‘ absorbed. by
the two stop members 11 and 19, and is not trans
mitted to the pins 35 on the pin cam 34 when it
70 reverses its direction of rotation.
When the reversing mechanism reverses the
direction of rotation of the pin cam 34, it also
reverses the direction of the» output- shaft 14 and
member 5| thereby actuates the reversing mech- ,
anism to reverse the ydrive of the pin Cam for
the loadv 15', thereby immediately operating
through the Geneva accumulator mechanism t0
2,408,067
5
6
rotate the stop 19 from position B to position A
(Fig. 2). Asithe output shaft ‘f4 continues to
rotate in the opposite direction, that is, a clock
an »accumulator device driven by said output
Ymember for operating said stopping means syn
wise direction as shovvnby the arrow in Fig. 3,
mechanism to arrest movement of said output
it actuates the Geneva accumulator mechanism
member during thek reversing operation.
83 to rotate the shaft 8l and stop 'It in a counter
2. In an apparatus of the character described,
the combination of an input member, a pin cam
driven thereby, a reversing mechanism connected
clockwise direction to position C, as shownin
dotted line in FiggB.
'
` 5
When the v‘output shaftl'fd. has been rotated in
chronouslywith the operation of saidreversing
between the input' member and pin cam for
a clockwise ydirection to 'a position at which >the 10 changing the direction of movement of the pin
cam relative to that of the input member, an out
reversing mechanismr again changes the direc
tion of rotation of the pin cam 34, whichr cor
responds to the center position of the follower
gear 59 on the pins 36, the Geneva accumulator
put shaft driven from the pin cam, means for
absorbing the inertia of the output- shaft on the
operation of the reversing' mechanism compris
83 rotates the stop 19 from position C, to position 15 ing a first stop member positioned by the out
put shaft, an accumulator driven by the output
D, as shown in Fig. 3, where it engages the stop
shaft, a second stop rmember intermittently
engaging member 'Il to absorb the inertia of the
- driven by the output of the accumulator into the
load during the operation of the reversing mech
' anism.
As soon as the direction of rotation of
path of the first stop member, the accumulator
the pin cam 3d is again reversed it begins rotating 20 being synchronized with the reversing mech
anism and effective on the reversing operation
output shaft M in a counter-clockwise direction
thereof to position the second stop member so as
so the stop member 'i9 is moved by means of the
to be engaged by the first stop member, thereby
Geneva accumulator mechanism 83 from position
arresting the movement of the first stop member
D to position C, from which point it is inter
.
mittently turned until `it reaches stop position 25 and the output shaft.
3. In an apparatus of the character described,
B, as shown in Fig. 2, when the reversing mech
anism is again operating.
i
the combination of an input member, a pin cam `
From the foregoing description it will be ap
parent that the input shaft Il may continuously
driven thereby, a reversing mechanism connected
nously with the operation of the reversing mech
operation of the reversing mechanism compris
'between the input member and pin cam for
rotate in either direction As it reaches a point 30 changing the direction of movement thereof rel
ative to the direction of the input member, an
in its rotation corresponding to an input angle
output shaft driven from the pin cam, a first stop
‘of 90°, reversing member 5l is actuated by theA
member fixed to the output shaft, a Geneva ac
Geneva accumulator 5t operating the reversing
cumulator driven by the output shaft, and a sec
mechanism to reverse the direction of rotation of
the pin cam 3d together with output shaft 14, rel 35 ond stop member driven by the accumulator dis
posed to be actuated thereby intermittently into
ative to the direction of rotation of input shaft
the path of the first stop member, the accumu
I I. «At the instant of operation of the reversing
lator being synchronized with the reversing
mechanism, stop- ’i9 moves into position t0 con
mechanism and effective on actuation thereof to
tact stop engaging member 'H to'absorb the in
ertia of the load 'i5 by stopping the movement of 40 position the second stop member so as to be en
gaged by the ñrst stop member, thereby arresting
output shaft M. This relieves the force of the
the movement of the output shaft.
jload’s inertia from the pins 38 on the pin cam 34,
4. In an apparatus of the'character described,
- While the invention is described in connection
the combination of an input member, a pin cam
with a pin cam trigonometric computing mech
anism for computing a sine of a given input 45 driven thereby, a reversing mechanism connected
between the' input member and pin cam for
angle, it should be understood that it may be
changing the direction of movement of the pin
applied to other types of mechanisms, in which
cam relative to that of the input member, an
it is desired to intermittently reverse the direc
output shaft driven from the pin cam, means for
tion of movement of an inertia load. The op
eration of the inertia absorber stops synchro 50 absorbing the inertia of the output shaft on the
anism relieves the'strain due to the inertia of thel
load from the driving mechanism and avoids
damage thereof.
,
Since many changes could be made in the
above construction and many apparently widely
different embodiments of this invention could be
made without departing from the scope thereof,
it‘is intended that all matter contained in the
above description or shown in the accompanying
drawing shall be interpreted as illustrative and
not in a limiting sense.
ing a first stop member fixed to the output shaft,
an accumulator comprising a Geneva mechanism
driven bythe output shaft, a second stop mem
ber intermittently driven by the output of the ac
cumulator into the path of the first stop member,
the accumulator being synchronized with the re
versing mechanism and effective on the operation
thereof to position >the second stop member so as
to be engaged by the first stop member, thereby
arresting the' movement of the first stop member
and the output shaft.
5. In an apparatus of the character described,
the combination of an input member, a pin cam
described, the combination of an input member, 65 driven thereby, a reversing mechanism connected
between the input member and pin cam for
a pin cam driven by said input member, a revers
What is claimed is:
1. In a computing mechanism of the character
said input member for intermittently actuating
said reversing mechanism to change the direction
changing the direction thereof with respect to the
input member, an output shaft driven from the
pin cam, means for absorbing the inertia of the
output shaft on reversal of the direction of the
pin cam comprising a first stop member fixed to
the output shaft, an accumulatorY comprising a
of movement of said cam, an output _member
Geneva mechanism -driven by the output shaft,
ing mechanism connectedY between said input
member and said pin cam for changing the direc
tion of movement of said pin cam relative to said
input member, an accumulator device driven by
a second stop member driven in a direction op
driven by said pin cam, stopping means for ar
resting movement of _said output member, and 75 posite to that .ofV the first intermittently into the
2,408,067
7
path 0f the ñrst stop member by the output of
the accumulator, the accumulator being effective
at they time of the reversing- operation of the
reversing mechanism to position the second stop
member to arrest the ñrst and thereby arrest the
output shaft.
8
of the pin cam relativeV to the-input member, an
accumulator device driven by ther input member
for intermittently actuating the reversing mech
6. In a computingv mechanism for computing
functions of angles, the combination of an input
anism to change the direction of movement of
the cam, an output member driven by the pin
cam, stopping means for arresting the movement
of the output member, and an accumulator device
driven by said output member for operating the
member displaced in accordance with the angle
stopping means synchronously with the opera
of which the function is to be computed, a pin
cam laid out according to the function to be com
ment of the output member during the reversing
puted displaced by the input member, a reversing
operation.
mechanism connected between the input mem
ber and the pin cam for changing the direction
tion of the reversing mechanism to arrest move
i
HENRY A. HERZIG.
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