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Патент USA US2405060

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July 30,1946.
Filed June 29, 1944" " _
-? > 4 Sheets-Sheet 1
July 30, 1946-
? I
Filed June 29, 1944
4 Sheets-Sheet 2
By PHILIP F ScoF/sw.
July 30, 1946.
Filed June ?29, 1944
4 Sheets-Sheet 3
F Scan/s1 0.
Julylw, 1946a -
Filed June 29, 1944,
4 Sheets-Sheet 4
Patented July 30, 1946
Philip F. Sco?eld, Cleveland Heights, Ghio, as
signor, by mesne assignments, to Jack & Heintz
Precision Industries, Inc., Cleveland, Ohio, a
corporation of Delaware
Application June 29, 1944, ?Serial?No. 542,700
4 Claims.
(Cl. 73-418)
This invention relates to a portable test stand
for testing aircraft starters and the like.
The general object of the invention is to provide
a compact and rugged portable dynarnometer
test stand for testing aircraft starters, ener
gizers and the like which is adapted for use in
the ?eld to give reliable results with speed and
The mounting plate 3 itself carries a plurality of
with the
as the
description drawings
proceeds il
lustrating a preferred embodiment of the inven
surface l2 with a heel portion [3 on the arm.
The cam surface 52 is formed from a vertical
dowels 5 and 6' on opposite sides thereof ar
ranged to enter holes in the starter mounting
?ange to prevent rotation of the starter on the
mounting plate, the dowels t being arranged to
?t a different sized starter ?ange than the dowels
5?. Thus the plate 3 may be turned over to pre
sent the dowels 6? outwardly, the dowels 6 being
A particular object of the invention is to pro
then disposed within the head 2. Openings may
vide an absorption brake torque testing device 10 be provided in the plate 3 for observation of the
which is particularly adapted for use with inertia
starter jaw in operation. A pair of clamping arms
1 are provided to hold the starter clamped tightly
type aircraft starters.
against the mounting plate.
A further object is to provide an aircraft starter
testing unit designed to readily accommodate both
Referring now to Figures 4 and 5, each of
left and right hand rotating starters of different 15 the clamping arms ?I is loosely pivoted by means
sizes which will indicate the rotational speed and
of a slot 8 to a vertical pin 9 on a side portion
torque developed in a simulated starting opera~
of the head 2. A spring operated ball detent It)
is contained in the rear end of each arm ?I in a
A still further object is to provide a test stand
position to bear against an upstanding post or
of the type described having novel quick acting ' screw head I! on the head 2 to resiliently urge
self-positioning clamping means to removably
the arm ?i into clamping position as shown in
hold a starter rigidly thereon.
Figure 4. Clamping engagement of each arm 1
These and other objects and advantages will
is positively maintained by engagement of a cam
shaft portion M ,iournaled in the head 2 adjacent
the pin 9, said shaft having a lever arm or handle
Figure 1 is a front elevational view of the test
I5 on its upper end. It will be seen from Figure 4
that when the lever arms l5 are swung for~
Figure 2 is a side elevational view with parts 30 wardly the cam surface l2 shown in section will
be rotated in a counterclockwise direction to en
shown in section;
Figure 3 is a view in rear elevation of the ab
gage the heel portion [3 and move the clamping
sorption brake structure and torque arms, the
arm ?I rearwardly on the pin 9. The forward end
of the clamping arm l carries an adjustable flange
driving shaft not being shown;
Figure 4 is an enlarged fragmentary view partly
engaging screw it which may be locked by a set
in top elevation and partly in section showing
screw I? in the proper position to ?rmly engage
the starter clamping mechanism in clamped posi
a mounting flange 25 of a particular thickness
on a starter 2i. The slope of the cam surface [2
tion; and
Figure 5 is a view similar to Figure 4 showing
is a very gradual one so that the above described
the starter clamping arms released from the ? clamping action will maintain itself by frictional
force when the parts are brought to the position
shown in Figure 4.
The device comprises generally a combined
base and frame I, best shown in Figures 1 and 2,
To unclamp a starter it is merely necessary to
having means to clamp a starter thereon in driv
rotate the handles it outwardly and rearwardly so
ing engagement with a rotatable shaft, and brake
as to rotate the shaft Iii having the cam shown in
mechanism, best shown in Figure 3, for absorbing
section in a clockwise direction. This rotation
the energy of said shaft and responding to the
withdraws each cam surface it?. from the heel. 13,
torque thereof.
allowing the detents is to move the arms 'i longi
Cast integrally with the base I is a cylindrical
tudinaily forwardly, and brings a back cam sur
head 2 carrying a reversible mounting plate 3 - face 22 to engage a toe portion 23 on each arm
which accommodates starters with different sized
?i to swing the arm outwardly to the open posi
mounting ?anges. The mounting plate 3 is re
tion shown in Figure 5. In the open position
movably carried in an annular recess 4 in the head
the resilient force exerted by the ball detents it?
2 in the manner shown in Figure 2, rotation be
causes both clamping arms 7 to bear against the
tion in which:
ing prevented by a large dowel 5 on the head 2.
cam surfaces. Then when the handles l5 are ro
tated forwardly to clamp a starter each toe por
tion 23? will follow the cam surface inwardly until
the arms 1 are parallel with the starter, and
overlying its mounting ?ange in position to be
moved longitudinally rearwardly upon further
rotation of the shafts M in the manner described
above to exert a positive clamping action.
The clamping arms 1 may be described as quick
acting and self positioning in view of their com
the brake tensioning hand wheel 46 ride free on
the shaft 21 and are positioned solely by the con
nection of the arm 41 with the torque indicator
which is in turn anchored to the base abutment
The torque indicator 57 being constructed for
receiving the application of force in compression
will be connected with the arm 4! and the abut
ment 55 on the right side of the device when the
rotation of shaft El is clockwise as viewed in Fig
pound pivotal and longitudinal movements in 10 ure 1, and will be connected with the arm 48 and
clamping and releasing a starter mounting
abutment 55 on the left side of the device for coun
terclockwise rotation. Force measuring indica
?ange by individual cam actuation as above de
tors operable in tension rather than compression
scribed. These arms are designed to satisfac
may be employed by merely connecting the in
torily clamp the various diameters of ?anges ac
commodated by the two sides of mounting plate 3. 15 dicator to the proper brake arm to utilize a ten
sion rather than a compressive force.
The head 2 is of general cylindrical shape to
receive therewithin a pair of bearing assemblies
The numeral 69 indicates a tachometer con
25 and 26 mounting a rotatable shaft 21. The
nected through a ?exible cable ill with a gear 02
shaft 21 is hollow and carries in its forward end
driven by the previously mentioned gear 3] on
a splined jaw clutch member 28, removably se 20 the shaft 2'5. Duplicate ?ttings 63 and 615 enable
cured by a screw 29, in position to be engaged
the connection of the tachometer on either side
by a jaw member 3i} on the starter. The shaft
of the base, so
to be adjacent the torque meter.
21 also carries a gear 3| for a tachometer drive,
The dial of the tachometer is preferably arranged
to be referred to later.
for indicating speeds in either direction, the di
Referring now to Figure 2 the shaft 27 carries 25 rection of movement of the indicator from a cen
at its rear end a brake drum 3% rigidly attached
tral zero position automatically indicating the
thereto by means of a ?ange and hub construc
direction of rotation,
tion 35. On the shaft 2? between the head 2 and
The device is preferably mounted on and se
the ?ange and hub construction 36 is a ?oating
curely bolted to a heavy bench or other suitable
bearing 31 carrying a brake assembly plate 38.
foundation of suf?cient rigidity to prevent over
The brake plate 33 carries a pair of brake shoes
turning under locked brake test conditions. By
39 arranged in braking relation with the drum
tightening the brake setting sufficiently the pres
35 and is externally provided with a pair of op
ent device is adapted to be used for a locked rotor
positely extending torque arms till and 4 l. Coarse
test simulatin;r the conditions encountered in at
adjustment of the brake shoes may be effected 35 tempting to crank a frozen engine, as well as nor
by a conventional wedge adjusting mechanism 42
ma1 operating tests with the brakes set to simulate
having a square ended adjusting screw 43 acces
the load. imposed upon the starter in a normal
sible on the forward side of the brake plate 33.
cranking operation.
The brake shoes 39 are brought to bear against
Thus the present device operates on the general
the drum 35 through the action of a lever 46
principle of a prony brake dynamometer, but the
operable by a ?exible brake cable 65 as shown in
re?nements of its novel construction adapt it
Figure 3. The brake cable ?35 is tensioned by a
particularly to the rapid testing of aircraft
hand wheel. 6&3 on a screw threaded member
starters in the ?eld. t is portable and rugged
operating in. a supporting sleeve ill on the plate 38
and will give reliable results in the hands of rela
as shown in Figure l. The sleeve ii?! is prefer
unskilled operators. The reversible mount~
ably provided with a scale 138 which is uncovered
ing plate and interchangeable jaw members, to
by the axial movement of an end 49 on a sur
gether with the twin torque arms, render the
rounding sleeve iii?: integral with the hand wheel
device adaptable to starters having different size
Mi whereby markings on the scale may be ob
served to roughly duplicate former brake settings 50 base flanges, di?erent jaw members, and having
either right or left hand rotation. Change overs
and torque loads. These calibrations indicate
from one type of starter to another are readily
hand wheel turns and experience will enable the
effected without dismantling, and without affect
operator to approximate in advance the desired
ll?lg the quick acting, self-positioning clamping
torque load by the preliminary setting of the hand
wheel. Fine brake adjustment necessitated by 55 means. Also, by suitably modifying the mounting
plate and removable jaw member 28, the pres
brake shoe wear, cable stretch, heat of the brake
ent device may be employed for torque and dy
drum, etc, may be made conveniently with an
namometer tests on other specialized apparatus,
ordinary wrench on an adjusting nut 5! on the
or for general application.
hand wheel hub.
Various changes may be madein the construc
Opposite sides of the lower part of the base I 60
tion and arrangement of parts and all such mod
are provided with rigid abutments 55 and 55 di
rectly beneath the arms 49 and ill for connection
with a torque indicator 5?. As shown in Figure 1
i?cations are included in the invention, the same
being limited only by the scope of the appended
I claim:
1. A starter test stand comprising a base, a shaft
in said base arranged for driving engagement by
arm iii through a similar pin connector 59, the
end of the torque arm being preferably bifurcated
said starter, a brake drum rigidly mounted on
in the same manner as abutment 56 to carry the
said shaft, a brake shoe plate associated with said
pin 59. The torque indicator 5? is a force meas 70 brake drum, a brake cable for actuating said
uring instrument stressed in compression by the
brake shoes, a hand wheel on said brake shoe
downward force exerted by the arm ill and may
plate for tensioning said cable, a graduated scale
be calibrated in units of torque.
associated with said hand wheel to facilitate the
The brake plate 38 carrying the above-described
setting of predetermined brake loadings, and ad
brake assembly, the torque arms til and M and 75 justing means associated with said hand wheel to
the torque indicator 5? makes pivotal connection
with the base abutment 56 through a bearing pin
58 and makes pivotal connection with the torque
compensate for brake wear and the like without
ing position, and rotatable in a reverse direction
disturbing hand wheel settings on said scale.
to release said clamping action and swing said
2. In a starter test stand, a housing adapted to
arms outwardly to disengage said base ?ange.
position a starter for driving engagement with a
4. In a starter test stand, a base housing carry
rotatable shaft, a pair of clamping arms pivoted 5 ing a rotatable shaft adapted to receive inter
on said housing for rotational and longitudinal
changeable jaw members for engagement by dif
movements, individual cam means in said hous
ferent starters, a reversible mounting plate on said
ing for moving said arms longitudinally to estab
base having opposite faces adapted to match dif
lish and maintain a ?rm clamping engagement
ferent starter mounting ?anges to position a
with a starter base ?ange and to swing said arms 10 starter in driving engagement with a jaw member
outwardly to release said base ?ange.
on said shaft, a pair of quick release clamping
3. In a starter test stand, a housing adapted to
arms pivoted on said base, and means on said
position a starter for driving engagement with a
arms to adjust for starter ?ange thickness in or?
rotatable shaft, a pair of clamping arms pivoted
der to clamp a starter securely to said mounting
on said housing for rotational and longitudinal 15 plate in position for said engagement as said
movements, resilient means for swinging said
clamping arms overlap� said mounting plate to en
arms inwardly to grasp a starter base ?ange, cam
gage said mounting ?ange.
means rotatable in one direction to move said
arms longitudinally from a grasping to a clamp
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