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Патент USA US2403812

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July 9, 1946-
c. R. MéCCALLUM I
2,403,812 Q
ANTISKID ‘TREAD
Filed May '7,~ 1942
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July 9, 1946. ~
c. R. MaCCALLUM
IANTISKID TREAD
Filed May 7, l942__
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2,403,812
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2,403,812 ‘ q
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Claude RonaldlMacCalliin'i, Glasgtnvv G113: I I > I
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Scotland
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1 Application ‘May 7, 19421,iSerial-'~No: 442§089
Ilf: GreatlB'ritain Mail-"ch‘14,19460Y ‘7
8 Claims.
(critic->209)‘ . > A_
This'sinv'ention Vhasreferjence to Wheelsor to the
' a'counter. effect wouldv at once takev plac'e,,by the
tires or: treads of the “wheels-of: power, driven
vehicles and has for its object; to provide improve
said yielding surface offering a much‘greater
resistance ?o-the “rotation; of, the said ?attened
ments whereby the driven wheels of power‘ driven
vehicles will more effectively grip the ground or
. sinlnnginto‘ the soft‘surfacdtwouldthen be con
_ sections, which, due tothe said rounded sections
road-surfaceuwhenhsncw, mudysand orthe-like is
encountered, and which, when hard road surfaces
are encountered, will run in a perfectly normal
tacting- with the soft. surface at-angles which
would effectively resist rotation. I may employv a
flattened section or flattened sections on one-disc,
its“ neighbouringgdisc having no ?attenedsections
Theinvention- is- based . on- a principle. ‘which ,I
andthe relation of the flattened section or sec
employin the construction and: operation in; use 10 tions of the one to the unflattenedperiphery‘ of
oiivehiclevwheel tires—pneumatic and otherwise~
the other in‘ the matter of; position and depth
as described‘ herein; and-whatever form;. each
being i as'herein-before'. described; : It is to' be- un- '
type‘: of: these-tires. may take; if vits construction
derstoo'd that, the‘ foregoing description :hasbeen
and operation in use are basedv uponhthe; prin
ciple: or means hereinafter described, it will‘ be
herein explained for the'purpose-of makinglclear '
and: setting onfrecordthe theory of the principle
typicaltas antexample of the/invention,
upon‘ which thé=~construction and; operation in
Assume that- two or more-1 preferably; thick,
use or my invention .areibased; {The peripheries
circular discs'or the equivalent of same,‘ or two
of the discs-arereferred tovv as representing; the
or moraconcentric rings/{each being of equal 20
The present invention has for its: object‘. tov ,pro
diameter and'each having a section or sections
ofitsperiphery ?attened ‘(the number of'flattened
videimprovements in wheels, or in‘; the tires; or
sectionss on each being‘ equal to the number of
treads ioriwheels whereby under certain condie
rounded sections on' same,- and therrounded sec
tions they wnrmore effectively grip the ground
tionsbeing, if so‘desired, greater in length than 25 or road; surface,- which will, notimpart any» vi
the, ?attened wsections, the‘periphery' as a whole
bration to the. vehicle andiwhich will notbev sub
being, ifgrso ndesirediioyf; any suitable degree :or
,J'ectzto undue wear by reason ,;of the improve
degreesiof ?exibility-are mounted coaxially' side
mentsv whereby the; aforesaid better, gripping
peripheries ofvehiclerwheel:tires-.5~
byzsideltocrotatein ‘unison; Also assume that
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- properties are attained;
theinposition in relation toleach other issuch
Preferred embodiments of‘ the. invention are
e. that each flattened section ofthe periphery on
illustrated-,- by' the annexed drawings wherein: p‘
one suchdisc is-opposite tojaerrounded section [of
the periphery: of its-neighbouring disc,- and’ that
j_; Figures-l and‘ 2 eachillustratean elevation of
one: form of tire,‘ whichhmayj be a‘ solid ‘or-‘Ya
~ inathegcaseof eachpair of discsqr theequivalent ‘ '
ofsamegthe extremeedge ofqone flattened section
of the one disc is parallel and directly opposite
to andvinylineiwith an imaginary horizontal line
drawnunder the- rounded section ‘of its neigh
bouring disc, when’ said. rounded section isr-the
miner-most:v roundedsection, said imaginary line
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pneumatic tire.
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Figure 3 is an elevation of the- twoitires illus~
tratedinFigures 1 andh2,v the tiresjbeingishown
in their juxtaposed positions. which: are the posi
tions they would occupy- when applied to a twin
wheel
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and
1
4
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Figure 4v is, an end elevation looking to the left
indicating. the depth , to, which the ?attened; sec
of Figure ,3-
tion-has been reduced-from the circumferential
“Figure-dis‘ an elevation of another construction
line.v '
of tire in accordance with the. invention and c
r
' “If; a forward‘propelling force be; now applied to
cause-thesaid» discsr (now analogous to avehicle
wheel).- to rotateon an axle, there should berota
tion and-reaction in the-‘usual way it same were
appliedtora hard'surfa'ce,» since a rounded sec
tionro?onebrm'ore of the discs would always be
.
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. Figure 6 is-an end‘ View thereof: looking-Vito the
left.»
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v Figure: 7is1anieleva'tion of a still further con
struction of tire inaccordanceiwith the inven-'
tion and:
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FigureJ‘B is an end view/thereof looking. to the
in-contactpwiththe saidsurface. If,v however, a 50
soft surfaceib'e‘encountered, and if the discs'had
v In theconstruction shown inFigures 1,. 2,3 and
no ?attened sectionszas hereinbefore described;
4, the‘ treads of the 'tires are“ formed by 'four
thermwouldzbe the usual: greatly decreased‘ sur-'
roundeditread sections a, a1; a2 and a3 and‘four
facesresistance' to rotation ,of: the discs-,rbut, hav
?atrtread sections“, 2;, b1, 122 andbks'aid rounded
right}
ing thesei constructe'ch aswhereinbefore: described, _
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sections» alternating, with ‘thefiiat: section'sirand
2,403,812
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together forming the complete periphery of the
tire. The number of rounded and flat peripheral
In the construction of tire shown in Figures '7
and 8 the tread of the tire towards each side
segments may be varied as found desirable. The
?at and rounded sections may be of the same
length, or the rounded sections may be longer
thereof is formed with a series of ?at tread sec
than the ?at sections. Each ?at section extends
at right angles to a line extending radially from
tions g, g1 and g2, the flat tread sections on each
side being spaced’ apart so that they are sepa
rated from each other by a rounded portion of the
periphery of the tread. Further the flat sections
on one side are staggered with respect to those
the centre of the‘tire, or the centre ‘of the wheel
on the other side. There" is therefore a contin
to which the tire is ?tted and passing through
10 uous circular tread surface which is never nar
the section midway between its ends.
rower than the breadth of the tread surface of
The tread surface, i. e. both the flat and
the wheel less the breadth of one of the ?at tread
rounded sections, may be ribbed, grooved or other
wise formed, as is the common practice, to grip
sections.
,
It will be noted that a part of the circular
the road surface. In the drawings the tread sur- 7
15 periphery of the tread extends between the ends
face is shown provided with transverse grooves.
Two wheels, each having a tire as illustrated in
of adjacent ?at sections.
When a power driven wheel having such tread
same axle with the rounded sections, a, a1, a2 and , is travelling over hard ground the load is taken
by the continuous circular tread and when trav
a3, of the one tire and the flat sections, 17, b1, 1)2
and b3 of the other juxtaposed as illustrated in 20 elling over soft ground the circular tread sinks
therein so that the flat sections on both sides of
Figures 3 and 4, the two wheels being secured to
the circular tread alternately also take the load
eachv other, or to the axle, in such manner that
to prevent or reduce slip;
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relative rotary movement is prevented.
I claim:
'A power driven vehicle is provided with a single
1. For a wheel, a tire having a peripheraltread
pair, or two pairs, of driving wheels having such 25
embodying curved and ?at sections, the curved
treads. When travelling over a good firm sur
sections conforming to parts of a circle the centre
face as indicated by the line C, Figures 3 and 4,
of which is the centre of the tire and the arcuate
the rounded portions of the two adjacent tires
tread surface of the curved sections being at
alternately take the load so that the wheels rotate
with the smoothness of a wheel having a tire of 30 leastequal in extent to that of the ‘flat sections,
while each ?at section, which at its- ends joins
the usual construction.
the adjacent curved sections, lies atright angles
When a' soft road, snow, mud or the like is
to a line extending'radially from the ‘centre of
encountered, as indicated by the dotted line, d
the tire and passing through such section midway
Figures 3 and 4, the wheels will sink, su?iciently
Figures 1 and 2, are mounted side by side on the
to permit the ?at sections b, b1, 1)2 and b3 to take 35
between its'ends.
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2. A tire for a" vehicle wheel having a tread
formed of alternate curved and flat sections which
have an arcuate extent at least equal to thatof
the flat sections, the curved sections extending
sections, however, give a much better grip of the
road surface, and therefor'e'prevent or minimise 40 the breadth of the tire and forming parts of a
the load in addition to the rounded sections so
that in each pair of wheels a rounded and a ?at
surface simultaneously take the load. The flat
slipping of the driven wheels. ~
circular periphery, the centre of which is'the
centre of the tire, while each ?at section, which
at its ends joins the adjacent curved sections and
extends the breadth of the tread, lies at right
extending round the periphery as above set forth
may be used in’ combination with a wheel having 45 angles to a line running radially from the centre
of the'wheel and passing through such section
a circular tread. When travelling over hard sur
Alternatively, a wheel having a tire provided
with alternate flat and rounded tread sections
midway between its ends, the construction being
such that by combiningja plurality 'of suchvtir'es
rounded or part circular tread sections of the
in such manner that the curved'sections or: one
other take the load, but when travelling oversoft
ground the tread section of the ?rst wheel sinks 50 are juxtaposed with the flat sectionsof another,
the load, when travelling over hard ground, is
so that the load is taken, in parts by each ?at sec
continuously taken by the curved sections and
tion in turn. ~ Such tread sections being ?at will
when travelling over soft ground, snow, ‘mud and
not slip so readily as treads which are circular
the like the load is also taken by-?at sections
and thereby more e?ectively grip the ground or
when prevent slip to a greater extent than can
the road surface. 1
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be ‘done by the curved sections.
More than' two wheels having such tires or
3. In a power driven vehicle a plurality of
treads may be mounted co-axially side by ‘side.
faces the circular tread of the one wheel and-the
In the tire shown in Figures 5 and 6 the centre V driven wheels mounted co-axially side by ‘side,
each wheel having a tire provided with a tread
peripherally extending part e forms a continuous
circular tread. At each‘side of this centre part 60 surface formed of alternate curved and ?at sec
tions which have an arcuate extent at least equal
are flat tread sections, 1‘, f1, f2, f3, f4, is, f6 and f".
to that of the flat sections, the curved sections
Each of said ?at sections lies at right angles to
extending the breadth of the tire and forming
a line extending radially from the centre of the
parts of a circular periphery the centre ‘of which
tire and passing through said section midway
between its ends. Further each ?at sectionis 65 is the centre of the tire, while each ?at section,
which at its ends joins the adjacent curved sec
joined at its ends to curved sections forming ex
tions and extends the breadth of the tread, lies
tensions of the circular tread e.
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at right angles to a line extending radially from
When a power driven wheel having such'tire
the centre of the wheel and passing ‘through such
is travelling over a hard surface the load is taken
by the continuous circular tread e but when 70 section midway between its ends, the ?at ‘sec
tions of one'tire being juxtaposedwith the curved
travelling over soft ground, the circular tread e
sections‘ of the adjacent wheel.» ’ -‘
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sinks therein and the load is then taken by the
4. Twin or duplex driven wheels for: power
circular tread and the ?at tread sections. f, ,1",
driven vehicles, said wheels being mounted :co-;
f2, f3, f4,_ I5, is and f‘,- the latter preventing or
reducing. any tendency of the‘wheel to slip. '
axiallyside by side‘ to rotate in unison, one of the
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2,403,812
wheels having a tread with circular periphery,
while the tread of the other wheel is formed of '
alternate curved and ?at sections, the curved
sections extending the breadth of the tire and
forming parts of a circular periphery the centre
of which is the centre of the wheel, while each
?at section, which at its ends joins the adjacent
curved sections and extends the breadth of the
tread, lies at right angles to a line extending ra
dially from centre of the wheel and passing
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at right angles to a radial line extending from
the centre of the tyre and passing through the
section midway between its ends, and being inter
connected by curved peripheral sections, said cir
cular tread and curved sections taking the load
when travelling over hard surfaces, and the ?at
tread sections taking the load, in part, when
travelling over soft ground, snow, mud and the
like and more e?ectively preventing slipping than
can be done by the circular tread.
through such section midway between its ends, the
'7. A vehicle tire having a continuous circular
arrangement and construction being such that
tread and ?at sections located alternately on
when travelling on hard surfaces, the flat surfaces
opposite sides of the circular tread, each ?at sec
do not contact therewith, but when travelling over
tion lying at right angles to a radial line extend
soft ground, snow, mud or the like, part of the 15 ing from the centre of the tire and passing
load is taken by the ?at surfaces due to the tread
through the section midway between its ends, and
with circular periphery sinking in the soft sur
being connected to each other by curved periph
face, so that the ?at surfaces will more effectively
eral sections forming extensions of the circular
prevent slipping than can be done by a tread of
tread, said circular tread and curved sections
circular periphery.
20 taking the load when travelling over hard sur
5. A vehicle tire having a tread formed, in part,
faces and the flat tread sections taking the load,
by a continuous circular tread surface, and in
in part, when travelling over soft ground, snow,
part by alternate ?at tread sections and curved
‘mud and the like and more eifectively preventing
tread sections, the curved sections forming part , ‘ slipping than can be done by the circular tread.
of a circular periphery while each ?at section, 25
8. For a wheel a tire having curved peripheral
which at its ends joins the adjacent curved sec
sections and ?at sections, each of which lies at
tions, lies at right angles to a line extending
right angles to a line extending radially from
radially from the centre of the tire and passing
the centre of the tire and passing through such
vthrough such section midway between its ends.
section midway between its ends, the two ends of
6. A vehicle tire having a continuous centre 30 each flat section intercepting the said curved
circular tread, and ?at sections located at each
peripheral sections.
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side of the circular tread, each ?at section lying
CLAUDE RONALD MACCALLUM.
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