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Патент USA US2404488

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Patented July 23, >1946
. 2,404,488
2,404,488» _'
James M.v Hait, San Gabriel, Calif., assignor to
Food Machinery Corporation, San Jose, Calif., a
corporation of Delaware
» »
Application >January 8,1942, seriarNo. _426,029
'Y ficlaims, (o1. 1'15-1)
' This invention relates to amphibian'craft and
particularly to track-laying devices for propelling
the same both on water and on land.
is a side elevational-view of afmodiiied`
form of the invention.
Fig. 4 is a bottom' plan view of Fig. 3; `
Referring specifically to the drawing, the pro-v
It is rcommon practice to employ for the propul
sion of such craft track-laying devices which are
pulsion mechanism I0 includes an endless belt -II
similar tothose employed for propelling tractors
and military tanks. These 'devices include end
phibian equipped with this mechanisms.'
and aset of bogie wheels -I2 provided on the am
term “beltf’
bethiheing imbedded in the rubber Vof >thebelt I I’.
The bogie wheels I2k aref'formed so `that each bogie
Wheel provides :a pair of rollers l5, the> belt I I
having articulating guide members I6 which'ex-`
tend'upwardly betweenv the rolle-rs I5 of the bogie
wheels I2 to hold the belt II inalignment withv
_ L
'Heretofore however it has beenl assumed to be
necessary to equip the traction beltsof these craftl
with metal blades or grousers to serve as impellers
when'the craft is traveling in the water and these ,
the bogie wheels.
blades werey not suitable toA allow _the craft to
travel at high speeds on land and particularly
on hard-surfaced roads.
and I8 -also serve torig'idly attach toïthe belt Il, > '
for an amphibian 'Craft which will provide an » Y
ably having downward iianged edges and bodies
adequate propulsiva thrust when the _craft is opl»
210i: rubber which are bonded to .theses plates.
Eachlof the plates _26 is attached to the‘belt f'II
by Aa set of'two bolts I'I andfa "center- bolt lilof
one ofthe clampsjld. ¿Theftvvof plates 26 of al
given grouser 25 therefore are capable of. articu
lation. relative to‘ each otherl when the belt II
erated in the water and at. the same time willV be 2
suitable for supporting the craft’ when the latter
is operating -on land lat relatively high` speeds
withoutfthe'mechanism incurring any substantial
damage due to this land travel.
In my laboratory experiments I have deter
mined that to attain the maximum efliciency in
impeller action each of said grousers must be
relatively long in the direction in which these
move with said belts. This renders it diilicult to
mount the most eflicient type of grouser on the
track-laying belts as the latter must make rela
tively short radius turns in passing around the
idle and driving sprockets with which the belt is
passes around a turning axis. The rubber‘of the
grouser bodies 2l is of sufficiently resilient char
acter -to accommodate itself to this articulationl ~
v -
It is another object of the invention therefore 40
will permit the use of grousers of Vhigh eiliciency ~
an endless series of grousersi25. Eachv _of these’l
grousers includes a pair of base plates‘26 prefer
propulsive mechanism of the track-laying type
to provide such a propulsion mechanism which
wheel guides I6 by bolts I1 and t8. - The bolts- Il
Clamps I4_ are held together- and tofthe bogi'e
It is an object of my invention to provide a
clamped» on the cables I3, these cables and clamps
In modern warfare theV usefulness of amphibian
craft would befgreatly enhanced- ii these craft
could be operated at high speeds on land.
- Thebelt I I isk preferably formed o_f rubber and
_ steel and includes endless `steel cables vI3 an'd’an
endless series of 5"steel clampsVV I4 Ywhich are ~
less` track-forming «belts or chains which will be
hereinafter referred to generically by use- of the
of the base plates 26 on which this rubber body
is mounted. In this manner a kmuch ‘longer
grouser may be mounted on the belt I I to vfunction
as a unit in engaging the water when the am#
phibian is afloat than would otherwise be'prac
This isof great consequence in thatV
grousers of maximumïefñciency necessarily must
be relatively longin the' direction' in which they
travel on the belt II.
The rubber block 211s' shown-ias' moldednto
and yet will facilitate these grousers readily pass-v
ing around turns of short radii, thus adapting
embody animpeller blade 30 which not' only in‘--j.
these grousers for use on track-forming belts.
the water but is of suilicient thickness to consti- .
Further objects and advantagesl will >be made-
corporates a highly eíi‘icient form forY attacking
manifest inthe following description taken in '
tute an adequate cushion support for the belt II
and the amphibian with which this ls equipped `
connection with the accompanying drawing in
when'the latter is traveling Von land. >_It isto be
Fig. 1 is a side elevational view of a preferred
embodiment of the invention with portions there
of broken away as indicated by the line I-I in
Fig. 2 to illustrate its construction._
' Fig. 2 is a bottom plan view of Fig. 1. _ »
noted _that the blade 30 is symmetrical on oppo
Vsite'sides ofthe longitudinal axis of the belt II,
Ytherimpeller on each side of this axis including , . a ~relatively long substantially straight blade por- __
tion 3| 'which is‘inclined outwardly in they direc
tion of its travel, _thelatter beingindicated by _.
' 2,404,488
' 3
Athe arrow 32,.and connects at its inner end with ‘
l a sharply curved portion 33 which terminates at
all suitable substitutes therefor or Vequivalents
ï a sharp central edge 34, the impeller blade 30
Í Vforming a cup 35 on each side of the longitudinal
1 ' 1. In an amphibian propulsion mechanism, the
What I claim is:
combination of: _an endless traction belt; means
for mounting said belt on said amphibian and
driving the same; an endless series of grousers
‘ z axis of the belt.
Whilek I regard the blade 30 to bea superior l
Í typerof grouser blade, from the standpoint of its 1
seeuredjitofsaid belt, each-of Ysaid grousers com
prising 'af'b‘ódy oi?J rubber andf'a plurality of at
‘ Water are balanced onopposîte sides `>of the axis 10 rtachingmeans for Aattaching said grouser to saidî
belt, said attaching means being adapted to have
Y ‘à Vnot
Yof the
so present
as to produce
no side
to belimited
thrust, I do
,tofvf` „articulating relation with each other when said
v l hydro dynamic elfñciency, and because >the reacà s
tionA forces producedby " its travel ‘through’ the
i the'use lof such a particular form of grouser blade.' `
belt travels around a turning axis.
ï1 theThe'present
use of resilient
means particularly
for- forming relates?to
a: grouser „v15
„-2. AIn an' Aamphibian propulsion mechanism, the
:combination of :"lan‘endless traction belt; means
l so that one portion of this may articulate Vrela- `
, tive toanother when the grouser passes around ‘y
formounting saidk belt on said amphibian and'
with my invention would'notfonly, be able to
travel at'relatively high speeds on land'and hard- ï,
surfaced roads and Vyet realize relatively high
e'ñ‘iciency in propulsive thrust from the track
the'portions of said- grousenat said points vof>
forming belts when traveling through Water.
3,. In an amphibian propulsion mechanism; thev
combination ofi-an endless traction belt; means
,driving the same; anendless series lof grousers,
1 a_ turning axis thereby permitting `a relatively
-a substantial portion of each of which is formed
l long and eñicient typeof grouserf bladeV to ë'be i " of»y a' resilient material; and means for securing
` incorporated With the belt.
said grouser to said beltat points spaced in the
It is believed clear that an amphibian equipped
direction of travel of said grouser on said'belt,
attachment being adapted to have flexing »or
articulating relation Withreach -other when
belt rotates about a~-»turning_-axis.
Y Referring'novvtofr‘lï'igs. 3' and il, IhaveY here 1
Í shown’ a belt H equipped with grousers v5i); each
said '
for mounting said belton. said lamphibian and '
drivingthe same; an endless. series of grousers
provided on said belt, each of said grousers havi->v
ingva base secured to saidbeltand an -impeller
blade formed thereon,;„said impeller blade-'3in1 '
, of which is >formed von a singletvbase’âl which is
‘ securedto alternate setsof bolts H> and I8 of
i the'belt H.' The'grouserñû hasarubberimpeller
1 blade 55 providedvvthereon, -the full length of
Y È which is obtained by extending end portions 5S
. l of these blades beyond the borders of >>the base `
,l 5|;` As the, grouser-,blades` 55 _are preferably
i „
cluding Va . centrall ,cup-„forming portion and'V outer .
blade portions dii/,erging symmetrically on. oppo
site sideso-f the. axis of said belt, the tipvportions
,85. ofV
said blades-_being formed Oirubber',
¿ formed entirely of»> rubber, A“the end portion 56 `
thereof Vvvill'gy'ield?readily from any object en
1 counteredthereby and is not depended upon. «for `
, any substantial contribution toward supporting w
the amphibian equipped with these grousers when'
l the amphibian is traveling cn land. In the Water ,
l however the grousers l'.ì'ö are >adapted to operate
Withk relativelyy high eñ‘iciency owing 'to their î
f While reference ‘has 'beenV made herein to the" '
4,( 'InV an amphibian propulsionmechanism, the
combination tof; an endless traction belt; rneansy
for mounting saidbelton lsaid «amphibian andV
driving the same; an endless.._series offgrousersv
provided on said belt, each yoffsaicl grousers ,hav
ing ,a basesecured toÍsaid belt andan impeller
Y blade .formed- therein, . said impeller; :blade includ».
ing a- centrall cup-forming: Yportion and >vouter
blade portions . diverging _ symmetrically - on oppo
Í gr'ouser's'of my invention being formed’of rubber,
sitelsides of theaxisof. said_,belt,the tipïzportions
Y ‘ this term. as: used in the claims Vis to beunder- `
i stood( as generic inv scope and-as embracing not `
tending beyond theborder line-'otV said base. ' i
g only/What is technically'known as rubberybut
of ysaid ,blades beingv‘ïormed of rubber; andex-el ,
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