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Патент USA US2404486

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July z3; 1946.
J. M. Hm "
Filed Jan. 8, 1942
Patented July 23, i946
- 2,404,486 .y
" y.
Hait,l San Gabriel, Calif.,j_as‘sigrînorfto.V
Food Machinery Corporation„,San Jose, Calif.,
a corporation of Delaware
application JanuaryY s, 194,2,l serials@ .fir/¿6,0271A `ï
(01.115411)v '
2' '
This invention relates to amphibian tanks tof
the endless track-laying type and has for> its prin;y
cipal object the provision of an improved propul
Whilevthese grousers I5 may be employed
out any‘intermedia‘te grousers disposed therebe-~`
tween, it has` been~found`expedient lto place a
half grouser 2| on the middleplate _of each ¿set
sion mechanism for use on such tanks totrans-`
form the motive power into propulsive thrust
'j of " three required for,v supporting afcomplete
vwhen thetank is floating in the water.A
'The manner of accomplishing" the foregoing ob
ject,- as wellas'further objects' and advantages,
will be made-manifest inf‘the following» descrip
grouservIS. ¿The relation ofthe gr`ousersfvl5l and
half grousers 27| are clearlyfshown in'Fig. ,2.„l2t'
is to bè noted that each grouser I5 hasa straight
portiorr- 2511which4 is relatively long `and;disposed;
tion taken .in -connection with" the accompanyingv 10 at a sharply acute anglerelative tov the,y direction
drawing, in which: n
of traveluof .theigrouserls on the belt-I4,v as indi
Fig. 1 is a diagrammatic fragmentary side ele
cated by arrows 26. :Towardfits¿¿outer~,or,¿rear
vational view of a preferred embodiment of the
end each grouser I5 has/a >curved portion52'I form
ing a reaction cup 28.
Fig. 2 is a bottom plan view of Fig. 1.
Referring speciñcally to the drawing, it is to
be noted that I have fragmentarily and diagram
matically illustrated a propulsive mechanism I0
in Fig. 1 as applied to an amphibian tank II.
'I'his tank includes a hull I2 equipped with suit
able Vbelt guiding and driving sprockets (not
shown) and a plurality of bogie wheels I3, a set
- of the latter being secured to each side of the
hull I2.
Trained about each set of these sprock
WhenV the tank II is ñoating in water,` and the
belts I4 are driven in the direction indicated by
' Ythe arrows 26, the grousers I5 and half grousers
2l operate to propel the tank through the water’
in the direction of the arrow 30. This is accom
plished by the straight portions 25 of the grousers
causing a Vrapid flowing of water therebetween.
TheV straight blade portions' 25 offer relatively
little resistance to this water movement. 'I'he
masses of water thus set in motion however are
25 caught within the cups Í28 formed by the curved
portions 21 of the grousers I5 »and in the half .
The belt I4 is provided with grcusers I5 which
ets and wheels is a ilexible endless belt I4.
extend downwardly therefrom substantially at
right angles from the plane of the belt. AThese
grousers 2| to cause 'a reaction which throws
this water downward and toward the rear. This
sets up a relatively high resistance to travel of
grousers support the belt I 4 and the tank I I when
the latter is traveling on land and are depended 30 the belts I4 in the direction of the arrow 26. This
naturally increases the thrust imparted to the
upon, when the tank is traveling through water,
to engage the water and propel the tank.
hull I2 of the tank II in the direction of the
arrow 30.
In exhaustive'laboratory tests, I have found the
grouser blades I5 to exhibit a high degree of
In my experiments I have noticed that the
efliciency. It is also to be noted that these grouser 35 grousers I5 have a marked superiority in per-l
formance when placed at approximately 50 de
blades are adapted to be mounted in a telescoped `
relation which gives adequate transverse support
grees with respect to the side of the tank II,
over the performance that these blades .have
tothe belt I4 when the wheels I3 pass thereover.
when they are placed with the chord thereof' at
The belt I4 is preferably reinforced by a series
of metal clamps I6 which are imbedded in the 40 right angles to the side of the tank.
‘ rubber of the belt I4. The clamps I6 are clamped
Maximum eiiicìency is attained with the
grouser I5 when the substantially straight por~
onto a series of endless cables I1 also imbedded’
' in the rubber of the belt so as to prevent the
tion 25 is relatively long as shown in the draw
stretching of the latter. It is particularly desir
ing. This length would make this grouser im
able in the use of this kind ofa belt to have each 45 practical l’or use on an amphibian were it not
of the clamps I6 well supported by the grouser
for the feature of dividing each grouser trans
blades when the wheels I3 ride thereover. This
versely into sections capable of articulation rel
is accomplished by mounting each of the grouser . ative to each other. This permits the grouser \
blades I5 on a series of plates 20, each of which
to readily pass around the idle and driven
is disposed immediately beneath one of the metal 50 sprockets (not shown) and the bogie wheels,
clamps I6. These plates are located fairly close
adapt itself to uneven terrain, and supply uni- >
together and are rigidly secured to the belt by
form and adequate support for the bogie Wheels
suitable bolts or studs which extend upwardly
of the tank.
through the clamps I6. Each grouser I5 pref- ~
While a belt as described is preferred as a tank
' erably extends across three of the plates 20.
sup-porting and track-laying element, the term
'is 2,404,486
endless elements generally.
3. 'In an amphibian propulsion mechanism, the
“belt” is here employed in the generic sense'
Which also embraces chain belts and ñexible
l. In anv amphibian propulsion mechanism, the
of: an endless belt; means
'Y mounting said belt on said amphibian for annu
lar movement; and aseries of propulsion grous-v „
combination of: anV Aendless belt; means for`
mounting said belt on said amphibian for annu
lar movement; and arseries of propulsion grous
ers on said belt, each grouser ybeing disposed
With the tip to Vtip chord thereof at an acute
angle ofapproximately 50 degrees With the di-¿
rection of movement of said' groùsers on said
belt, the most forwardly disposed 'portion >Vof»`Y
ers- on Vsaidrbelt, each grouser being‘ disposedY
with thetip to tip chord thereof'at an acute“, yeach grouser being relatively long and substan-Y 4
angle with the direction of movement of said-j l tially straight and disposed at a smaller angle f
grousers on said belt, the mostiforwardly Vdis-V » v with respect -to ysaid direction Vthan said chord;
While theV rearmost portion of said> grouser is ~
posed portion of each grouser being relativelylong _and substantially straightv and disposedV at f »_ relatively sharply curved toward the direction of
a smaller angle with respect tox'said direction ~
than said chord,rwhi1e the rearmost portion of
said grouser is relatively sharply curved. toward f
the direction of movementrof said grous’ers.
rriovèment'ofv said grousers.
V4. A -combination as in claiml in' which a
semi-grouser comprising a curved >blade sub
stantiallyv like the curved portion of the afore
said grouser is disposed between adjacent pairs ‘
2. In an amphibian propulsion mechanism, the
combinationA of: van endless belt; means for 20V of the aforesaid grousers in positions corre
spending to the positions of the curved portions
mounting ' said? belt lonV said amphibian> for annu
lar movement; anda series of propulsion grous
Aof VVthe aforesaid grousers, the space between
ers on'sai'd belt, each grouser being' disposed ' straight portions of adjacent grousers being sub'
With'the tiprtò‘ tip 'chord thereof at aniacîute
5. A ’combination
as in claim lgin , Whichfsaid
angle of"> from about 40 „to 60 degrees WithY thev 251
direction of movement ofsaid' grousers on said
tion iniwhich they travel each grouserbeingßdi
belt, the most forwardly disposedî portionr of
vided'into _a plurality of sections„said sections
each grouser being relatively longV and substan
being. adapted to'articulate one relative to'y the»V '
Vtially’straig'ht and disposed at a smaller'. angle
with >respect to said direction than said*- chord,
while the rearmost portion of said grouser is
relativelysharply curved- toward the'direction of
movement of said grousers.
30 "
other when said belt bendsv around aturning n ,
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