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July 22,
R. c. MASON
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TIRE CROSS CHAIN
Filed Jan. 10, 1946
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WITNESSES:
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INVENTOR
m 6.710!“
444 ATTORNEYS .
Patented July 22, 1947
2,424,478 '
UNITED _ STATES "RATENT ‘OFFICE
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"2,424,4'1s
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TIREI‘GROSS cGHAlN
Robert CJMason, I’itts'burgh, .Ba.
.iApplicationdanuary 10, 1346,’ Serial No. 640,171
“9 Claims. (o1.l152_-225)
1
.
In accordance with the "present “invention,
there are provided certain improvementsinianti
skid tire chainsyand more-particularlyin an':im—
proved cross or tread chain forming a .‘-part
thereof.
a
It is a universal practice to provide the tires
of the driving wheels of- motor vehicles withanti~
skid chains when roadway surfaces becomecova
ered with ice or snow.
These ranti-skid‘chains
customarily are‘ made up ofapair offsidechains
that engage the side ‘walls of a tire circumfer
entially thereof, these .side chains being ‘con
nected by a plurality of -cross_or ‘tread chains
which are spaced around the tire and'closely‘en
gage the treads‘ of the tire. These cross-chains
generally are composed-of series of chain links
which wear away and break in a short time.
Itis among the objects of this invention to
2
any suitable ‘type. Upon ‘this rim is mounted a
tire casing :B,'this casing ‘having the usual tread
portion C. ‘The ‘tire casing B is shown as being
provided with an anti-skid chain having side
links ‘:6, ‘to ‘which'the opposite ends of spaced
c1‘0ss-.-.‘chains?8.are attached.
The “cross-chains of the present invention are
composed ‘of ran intermediate portion or'link D
and rattaching ‘instrumentalities E for attaching
thecross-chains 'toathe side links 6. ‘Each of the
links'D is composed of a ?exible cable ID which
is ‘formed preferably of twisted strands of gal
van'izedsteel wires of . gauge and quality suitable
for affording ‘adequate ?exibility for readily con
formingthecross=linksiby"manua1 adjustment to
the :transverse ‘configuration of the tire. ‘The
?exible cable 7H1 vforms ‘the ‘mounting ‘means for
mounting and rassembling‘the tread elements ‘l2,
as ",willbe described hereinafter’in greater detail.
provide .a cross-chain which hasa muchlonger
life than those .made from chain links, which “20 The treaduelements 12 preferably are made from
small :metal plates ‘composed of hard, wear-re
- provides better traction on ice and snow, which
sisting ‘steel, :preferably case hardened, contain
is stronger and more durable, and which does not
ingrfrom 0;10~to .020 per cent carbon. The tread
become clogged with ice and snow.
elements‘havea ?atrback portion [4, ‘ adapted to
A further object of the invention is‘toiprovide
lie :?at against "thertrea‘d ‘portion .C of the tire,
an improved mountingmeans for the tread“..ele_
ments that ‘facilitates greatly the assembly of
and traction portionsil? having traction surfaces
sli?sadaptedvto engage the‘ surface ‘of the roadway
“along which :‘the vehicle is ‘traveling. The trac
Further objects of ‘the invention will become
ltionportions :I 6 ‘are‘divergent from the back por
apparent as the description proceeds, and the
:30
tion ~l4,1'so‘-rthat>the opposite ‘traction surfaces ‘I 8
features of novelty will be pointedout in partic
areisubstantiallyrfarther apart than‘ the corre
ularity in the appended claims.
‘
sponding dimensions of the ?at back portion Hi.
The invention will be understood more readily
This .‘divergence of the traction ‘portions i6 is ef
by reference to .the accompanying drawings'rin
fectiver'for preventing loosened snow or ice from
the tread elements.
which
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1.
Fig. 1‘ is a transverse section of a rim‘oiavvheel
of .a motor-‘vehicle on which rim a tire is mount
ed, there being shown an -anti-skid.chain ipn‘the
tire which embodies cross-.chainsof the'impr‘oved
construction of the present invention; .
.a . roadwaylbecoming packed-between‘the traction
portions, thus ‘keeping'the tread elements clean
for efficient gripping and-penetration of ‘a slip
pery coating on a roadway. The angle‘ that these
diverging traction ‘portions l6 ‘make with ‘the
Fig. 2 is an enlarged transverse-section taken £40 back portion 44 also is ‘rather critical, for it
must \be wide enough to prevent “this packing of
through ‘an ,improved anti-skid cross-chain of
loosened snow ‘and ice between the traction por
the‘present invention, the view being‘ taken _on
the line 11-11 of.1=‘ig.3;
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Fig. 3 is a plan view of an improved. cross
chain of the ‘present invention, the View ‘being
taken‘ looking-at the traction surfaces of‘the‘tread
elements and showing the improved mounting
means for the tread elements; and
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Fig. 4 ‘is a detailedperspectiveview of onejo‘f
the improved tread elements ‘of the present "in
vention, showing enlarged details of ‘the con
struction'thereof.
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tions, .andyet not be .too wide for inhibitinge?i
cient contact .of the traction surfaces [8 with
theroadway. In practice, this angle between
the traction‘portions l6 and the backvportion I4
is ‘made ‘approximately .135 degrees. Traction
surfaces l8 are provided with sharp edges and
corners’for emcientrpenetration of‘an icy road
way ‘surface.
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‘PIt'wilPbe seen ‘that when the cross-chain of
the present invention is completed, the cable VI 0 is
bentlfinto an endlessgsubstantially elliptical con
?gurationgsuch as an elongated“ loop, the parallel
reference character A designates the 'rini‘of 'a
wheel of a motor‘ vehicle, which rim‘may-rbe? of 55 sides, of .which'are spanned by the tread‘ elements
Referring vvmore particularly'to the drawings,
2,424,478
4
I2. In order to mount the tread elements on the
cable I 0, each of these elements is provided with
recesses, indicated at 20 and 20a substantially at
the juncture of the traction portions I6 with the
back portion I4. These recesses are formed by
produce the outwardly bowed ribs without stretch
ing the rib metal materially.
According to the provisions of the patent
statutes, I have explained the principle and con
struction of my invention and have illustrated
and described what I now consider to represent
its best embodiment. However, I desire to have
it understood that, within the scope of the ap
providing the tread elements with suitably spaced
parallel slits which extend through the traction
portions I6 and into the back portion I4, and by
pressing out the intermediatezmetal into ribs
pended claims, the invention may be practiced
suf?ciently far to form ‘spaces large enough for 10 otherwise than as speci?cally illustrated and de
the passage of the cable I0 therethrough. The
scribed.
cable is passed through each succeeding space
I claim:
20 of the several tread elements I2 and the cable
I. A cross-chain for anti-skid tire chains, com
is sufficiently long so that its ends project. a sub- . prising a flexible wire cable adapted to extend
stantial distance beyond the treadelements to 15 across a vehicle tire, means for holding the cable
enable the ends to be bent around ‘and inserted " in place, and a plurality of tread elements extend
in openings 20a in the same manner. These ends "
ing across the cable, each of said elements having
are brought into overlapping relation to form a , a body provided with a struck-out portion hold
short double length 22 of the cable which passes
ing‘said cable tightly against the body.
through a couple of successive spaces 20a, the 20
2. A cross-chain for anti-skid tire chains, com
cable thereby being bent into the'afo'resaid sub
prising a ?exible wire cable formed into an elon
stantially elliptical con?guration with end loop
gated loop, means connected to the opposite ends
portions 24 adapted to receive the attaching in
of the loop for fastening it in place across a ve
When the" traction elements I2 thus have been 25 hicle tire, and a plurality of tread elements ex
tending across the loop and secured to both sides
assembled on the cable,‘ the-aforesaid ‘ribs of
of it.
strumentalities
E.
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pressed-out metal, indicated at 26, 26a, are
pressed back against the cable to pinch the cable
in'the'angles between the back'portions of the
3. ‘A cross-chain for anti-skid chains for motor
vehicle tires, comprising an endless ?exible
tread elements I2 . and the traction portions 30 mounting cable having a pair of substantially par
allel sides and curved end portions, a plurality
thereof. Therefore, the ribs tightly clamp the
of tread elements spaced along the mounting
cable and tread elements to ‘each other rigidly
cable and spanning its parallel sides, and means
enough to ‘restrain the traction elements against
for frictionally clamping the tread elements to
displacement along the cable, and to prevent the
overlapping ends of the cable .from pulling away 35 both of said parallel sides.
,4. A cross-chain for anti~skid tire chains, com
from each other. This manner of fastening the
prising a mounting member adapted to extend
tread elements to the cable loop eliminates weld
across a vehicle tire, and a plurality of tread ele
ing or separate ‘fastening members. It will be
ments extending across said member, each of
observed that the cable is spaced from the tread
portion of the tire‘by the tread elements, so those 40 said elements being provided with a struck-out
rib between which and the body of the element
elements can "rest ?at against the tire'and can
the mounting member extends, and said rib press
not pull away from the cable. The ?exibility of
ing said member tightly against the body of the
the'cable enables the ‘tread elements I2 tolbe
tread element.
brought readily into conformity with the con?g
uration‘of the tire tread and into tight and uni
form engagement therewith.
.
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45
5. A cross-chain for anti-skid tire chains, com
prising a ?exible wire cable forming an elon
gated loop and having overlapping end portions
Connected‘to the end loops of cable‘ I0 are the
at one side of the loop, a plurality of tread ele
attaching members E which are books preferably
ments extending transversely across said loop,
made by bending a suitable length of stiff wire or
rod intoa double hook 21. and a loop 28 in which 60 and means for clamping said elements to both
sides of the loop and to said overlapping end
the cable is received. “The cable is ‘inserted 'in
each hook by manually pressing the cable be
tween the doubly bent wire until it enters the
loop 28_' The stiffness and strength of‘the wire
vehicle tires, comprising a ?exible mounting cable
forming the ‘hooks prevent accidental displace—
65 bent into an endless con?guration having a pair
ment of the hooks from the cable, therefore env
abling ready attachment of the cross-chain to the
of spaced approximately parallel sides, a plurality
of tread elements spaced along the mounting
cable and spinning its parallel sides, and clamp
ing ribs integral with the tread elements for fric
tionally clamping the tread elements to both of
said parallel sides, the said clamping ribs‘ rein
forcing the tread elements against distortion dur
side links 6.
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It will be seen that the provision of, anchoring
openings or recesses 20, 20a in no way lessens
the strength of the tread elements I2; and the
ribs 26, 26a actually reinforce and brace the
traction portions I6 against deformation in serv
portions of the cable.
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6. A cross-chain for anti-skid chains for motor
ing service.
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ice. It will be noted further that while the trac
7. A cross-chain for anti-skid tire chains,
sufficient’ for rigidity, so that increasing wear does
tween it and the tire, each of said tread ele
ments having a back portion from the ends of
tion surfaces I8 haveisharp corners and edges, 65 comprising a ?exible wire cable formed into an
elongated loop, a plurality of laterally spaced
those surfaces are the same thickness as the re
tread
elements extending across the loop be
mainder of‘ the tread elements’ I2,'which is only
not impair the ice-penetrating characterof the
which traction portions project outwardly for
traction portions I6. , The length of the traction 70 engagement. with a roadway, and ribs integral
portions'allows‘agreat deal of wear before they
with the tread elements and extending across the
are worn away. ‘By forming ribs 26, 26a at the
sides, of the loop to clamp them in the angles
inside of the angles between traction portions I6
between said back portions and traction portions.
and back portion‘ I 4; there is enough metal to 75 i 8. An anti-skid tread element for usewith a
2,424,478
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?exible wire cable loop stretched across a vehicle
tire, said tread element being formed in one
piece from a metal plate and having a. substan
REFERENCES CITED
tially ?at back portion from only the opposite ends
of which traction portions diverge, and said tread
element having struck-out portions adapted to
clamp the sides of said loop in the angles between
said back portion and said traction portions.
9. An anti-skid tread element for use with a
?exible wire cable loop stretched across a vehicle 1°
tire, said tread element being formed in one-piece
with roadway-engaging ends connected by a, tire
engaging body, said element also having struck
out ribs adapted to extend across the sides of said
loop and to hold the cable against said body.
ROBERT C. MASON.
The following references are of record in the
?le of this patent:
UNITED STATES PATENTS
Number
2,099,006
1,644,077
1,405,051
Name
Date
Eger ____________ __ Nov. 16, 1937
Nesbitt ___________ __ Oct. 4, 192'?
Love ____________ __ Jan, 31, 1922
FOREIGN PATENTS
Number
582,751
Country
Date
France __________________ __ 1925
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