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Патент USA US2135048

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Nov. 1, 1938.
2,135,048
H. w. GIFFIN
JOINT
Filed March 25, 1957
ig.1 13
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13 F1. 9-2 14
Fig.3”;
/8,
Inventor
Harold W. Giff/‘1'1
B
.
a?
,
itorney
Patented Nov. 1, 1938
>
,_ 2,135,048
UNITED STATES PATENT OFFICE
2,135,048
JOINT
Harold W.‘ Gif?n, Trenton, N. J.
Application March 23, 1937, Serial No. 132,481
8 Claims.
This invention relates to an improved expan
sion and contraction joint, that is, a device which
serves as a protecting medium for the openings
(Cl. 94—-18)
sirable and through the application of my inven
tion to- joint devices, these undesirable features
arev eliminated.
A further object of my invention is to provide
surfaces to allow for expansion and contraction a cheap and practical means for preserving a
of the surfaces. The device is adapted to be used smoothness and continuity of the pavement sur
in the construction of roads or highways, side-, ‘ face in order that the riding quality of the pave
walks, walls, ?oors of buildings, swimming pools, ment may not be impaired. In using the previ
or any other surface where expansion and con
ously known rigid joint structures, when wear
H) traction occur. It is particularly adapted to and
occurred on the plate supporting ledges or shoul 10
which are placed between substantially abutting
useful in constructing concrete roads and high
ways where the pavement, constructed on a suit
able base, is divided into sections or slabs, said
slabs having a space between the substantially
15 abutting sections to allow for expansion and con
traction of the concrete under the in?uence of
temperature and moisture changes. The dis
cussion and description of my invention will
hereinafter be directed as applied to roads and
20 highways, but the speci?c description and em
bodiment shall not be construed as excluding any
other of the numerous practical applications of
my invention wherever expansion and contrac
tion of surfaces occur.
25
I-Ieretofore various tread-plate-types of expan
sion and contraction joints have been used in
constructing concrete roads and highways, and
although the e?iciences of the previously known
joints are not questioned, the joints are compli
30 cated in structure and quite cumbersome to han
dle in the construction work. It will be quite ob
vious also, that if the joint device is complicated
in structure, the cost of manufacturing such joint
device will be so high that it will be too expensive
35 for use in general highway or road construction
operations.
The- present invention has, therefore, for its
general object, to improve expansion and con
traction joints of the tread-plate variety by sub
40 stituting for the complicated and expensive de
Vices heretofore used, a device having relatively
few parts and in which all elements are sturdy
and simpli?ed in structure. In introducing the
combination of few working parts and simpli?ca
45 tion in structure the manufacturing costs of the
joint device will be reduced, which has an impor
tant bearing upon the highway cost.
Another object of my invention is to create an
expansion and contraction joint device in which
50 the elements of the joint have a great deal of
?exibility in operation in contrast to a rigid
structure. The previously known tread-plate
joints are keyed, bolted or wedged together in
such a manner that no vertical flexibleness of
the device is possible. Such conditions are unde
ders, the loose plate created undesirable irregu
larities in the pavement surface as well as noise.
Through the use of my ?exible and automatically
adjusting tread-plate to any normal wear of the
concrete slabs, these troublesome features are 15
vitiated.
.
.
A still further object of my invention is to pre
pare a joint device which, through the constant
tight ?t between the tread-plate and the con
crete, will prevent any surface water from drain 20
ing or ?owing into the expansion crevice between
the adjacent concrete slabs.
The constant posi
tive tension whichis on the tread-plate in my'
invention prevents the surface water from drain
ing into the opening, which, as is widely known
in the road construction art, is quite di?icult to
control. It is generally recognized that when
Water enters into the joint space and thence to
the sub-grade, the sub-grade beneath the sub
stantially abutting slab ends tends to soften,
thereby decreasing the load-bearing power of the
sub~grade. Furthermore, it will also be obvious
that through the tight ?t between the tread-plate
and the supporting shoulder, dirt, stones, or other
foreign substancesrwill be prevented from depos
35 '.
iting in the opening which would ultimately cause
spalling.
An additional object of my invention is to
construct an expansion and contraction joint de
vice which can be disassembled in a very short
time and permits access to the joint space for
inspection and repairs. Heretofore, it was
oftimes necessary to cut away part of the pave
ment or joint structure to permit access, but as
will be obvious in studying the joint device
claimed as my invention, such steps will be un
necessary in using my invention.
Another object of my invention is to design an
expansion and contraction joint which can be
adapted and" adjusted to irregularities and im
perfections of workmanship in the concrete slabs.
In using previously known joints of the tread
plate variety, considerable care was necessarily
exercised in preparing the opening between the
slabs of concrete inorder to acquire a perfect 55
2
2,135,048
?t between the joint device to the concrete.
However, through the use of my joint structure,
wherein the spring-action, hereinafter described,
will compensate for any irregularities in struc
5 ture or for normal wear action, an assurance of a
perfect and tight ?t can be obtained under quite
extreme adverse irregularities and conditions in
structure or wear.
-
Generally stated, my invention in its broadest
10 physical embodiment consists of a tread-plate,
spanning the opening between the adjacent or
strength to the aligned concrete slabs as well
as serving as an anchoring medium for the spring
bolt I5. One end of the spring bolt I5, is secured
to the tread-plate through any suitable means as,
for example, in the ?gures, the bolt or screw III,
is inserted through the apertures of the tread
plateand threaded over the threads IS, on the
end of the spring bolt I5. The other end of the
spring bolt I5 is bent into a loop which is adapted
to be slipped over the dowel pins I1, and anchored
substantially abutting slabs, and held in place by
thereto. 'The constant pull imparted by the -
an anchoring device including a ?exible spring
spring bolt upon the plate tends to hold the
means.
The spring means exerts a constant or ' tread-plate in place at all times.
15 positive pull upon the tread-plate, thereby as
suring a tight contact between the plate and the
' section of concrete supporting the plate.
In or
der that the inventionmay be fully and clearly
understood as to its method and principle of
20 operation, and as to the essential features of its
physical arrangement, I have illustrated simple
and practical forms of the‘ expansion and con
traction joint device in the attached drawing
which I have found afford satisfactory and de
25~ sirable results in highway engineering activities.
In referring to the drawing:
Fig. 1 is a fragmentary sectional view of a
pavement equipped with a joint structure of my
invention.
30' Fig. 2 is a fragmentary sectional view of the
joint structure taken along the line 2--2.
Fig. 3 is a fragmentary sectional View of a
pavement equipped with a modi?ed form of my
joint structure.
~ '
'
Fig. 4 is a sectional view of another modi?ed
form of my joint structure.-
,
Fig. 5 is a perspective View of a pavement
structure including a view of the tread-plate and
the expansion and contraction device.
U
crete slabs imparting the usual rigidity and
Referring in more speci?c detail and by refer
ence characters to the drawing, which illustrates
preferred embodiments of my invention, frag
mentary sections of concrete highways are dis
closed equipped with various modi?cations of
45~~my improved expansion and contraction joint.
In the drawing 'a foundation I0 is disclosed upon
In order to prevent water from seeping into 15
the expansionspace between the spaced con
crete slabs, a water-tight seal in the form of a
gasket It,‘ is provided between the tread-plate
I3, and the supporting shoulder I2. The gasket
generally is a ?brous or woven material saturated
with a bituminous substance, but rubber or any
other water-proo?ng material may be used. It
is understood, however, that the insertion of the
gasket between the plate and shoulder is not
always necessary, particularly where excellent 25
workmanship in the construction of the shoulders
and plate have been followed thereby providing
uniform contact of the contacting surfaces. Ad
ditional plastic ?ller I8, preferably a bituminous
substance, is placed in the space between the sides
of the tread-plate and the walls or edges of the
shoulder portion I2. It is also obvious that the
plastic ?ller is not absolutely necessary for the
operation of the joint, but it will tend to prevent
dirt, grit and water from ?lling the areas which 35
preferably are kept free.
1
In Fig. 3 a modi?cation’of my spring element
joint is shown which operates in substantially the
same manner as the joints disclosed in Figs. 1'
and 2, but a re-arrangement of the parts make 40
it desirable to disclose and describe the modi?ca
tion. In preparing the concrete slabs II, oppos
ing recesses 26 are placed at the'bottom of the
slabs as well'as the opposing shoulders I2 at the
top of the slabs. Arspring plate 2I having the
‘opposite ends pressing- against the upper sur
which a plurality of separated, but contiguous 7 faces of the recesses 26 is held ?rmly in place by
and aligned pavement sections or slabs II are a bolt 20, which is inserted through an opening
of the spring plate and anchored to the tread
placed or cast. The sections are spaced suf
plate I3. The downward pressure exerted by
i?ciently far apart to allow for the thermal ex
pansion and contraction of the slabs and at the ' the spring plate against the bolt head 24 will tend
to hold the tread-plate securely in place at all
same time to permit the insertion of an expan
times.
,
sion and contraction joint.
Another modi?cation of my invention is dis
In my invention, the spaced oposing faces of
closed in Fig. 4. The plate 25 has an opening
, each pair of concrete slabs II are partially cut
55 away or cast in reduced thickness, in contrast through which the spring bolt 22 is passed, the
to the thickness of the main body of the slab ends of which are fastened to the tread-plate I3
and the plate 25. The constant positive pull ex
thereby forming opposing and depressed shoul
erted by’ the coil spring 23 will tend to pull the
ders I2.
'
'
Bridging the space between the slabs II and plate 25 against the upper surface of the recess
26 and also pull the tread-plate I3 toward the
adapted to rest on the shoulder portions I2 is a
shoulders.
rigid. tread-plate IS. The tread-plate is dis
It is obvious that through my invention a posi
posed on the shoulders in such a manner that the
surface continuity of the highway is maintained, tive pull is exerted at all times upon the tread
and at the same time allowing adequate space for plate 63 in the various modi?cations of my in
65
expansion and contraction of the structure, which vention. Even though there may be wearing ac
space may be ?lled with a plastic material I8. tion on the shoulder surfaces, the constant pull
The tread-plate usually extends across the pave- ' on’ the plate, will tend to keep water, dirt, or
ment as shown in‘ Fig. 5, thereby generally bee other foreign material from entering the space
70' ing rectangular in shape. The plates as shown between the spaced concrete slabs. As a further
in the several ?gures have spaced apertures improvement and protection in conjunction with
through which connecting means I4 are inserted,
. which will hereinafter be discussed in more detail.
In Figs. 1 and 2,'conventional dowel pins or
75-lbars I1 ‘are shown extending between the con
my invention in adapting to concrete highways, "
the'tread-plate I3 may be bent ‘downwardly to
protect the spaced'bpening at the side of the
slabs 'I I-, as disclosed ‘in Fig. 5.
-
r
'
3
2,135,048
In the above speci?cation ‘a description of the
objects of the invention and a detailed discussion
of the speci?c elements of my invention have been
given. Obviously, so far as the spring action ex
pull and adapted for engagement with the plate
and pavement sections, said means engaging the
pavement sections through the medium of‘ said
details of the structure may be modi?ed from the
above shown details. Changes in the form, con
metallic means connecting the pavement sections.
4. In an expansion and contraction joint struc
ture for pavements and the like comprising, in
combination with a pair of spaced pavement sec
struction, arrangement and combination of parts
tions having opposing recessed shoulder portions
may be made and substituted for those herein
10 shown and described, but it is understood that I
at the top and opposing recesses at the bottom of
the sections, a tread-plate having a rigid portion
disposed in spaced relation between the outer
edges of and resting on the shoulder portions of
said sections, a metallic spring means extending
between and disposed in the opposing bottom re
pansion andcontraction joint is concerned, the
reserve as a part of my invention all such varia
tions and modi?cations which fairly fall within
the scope and spirit of my claims.
Having thus described my invention, I claim,
"
cesses of the pavement sections, andvmeans adapt
15 as follows:
1. In an expansion and contraction joint struc , ed to engage the tread-plate and spring means
ture for pavements and the like comprising, in for anchoring the tread-plate in place, said spring
combination with a pair of spaced pavement sec v means exerting a substantially downward pull on
tions having opposing recessed shoulder portions
20 at the top, a tread-plate having a rigid body por
tion disposed in spaced relation between the outer
edges of and resting on the shoulder portions of
said sections, and means including a spring ele
ment adapted for engagement with the plate and
25 pavement sections, said means exerting a sub
stantially downward pull and anchoring the
tread-plate in place.
2. In an expansion and contraction joint struc
ture for pavements and the like comprising, in
80 combination with a pair of spaced pavement sec
tions having opposing recessed shoulder portions
at the top, a tread-plate having spaced apertures
_ and a rigid body portion disposed in spaced rela
tion between the outer edges of and resting on the
35 shoulder portions of said section; and means including a spring element adapted for engage
ment with the plate and pavement sections for
anchoring the tread-plate in place, said means
engaging the plate through the medium of the
apertures in the plate and exerting a substan
tially downward pull on the tread-plate.
3. In an expansion and contraction joint struc
ture for pavements and ‘the like comprising, in
combination with a pair of spaced pavement sec
tions having opposing recessed shoulder portions
at the top, a tread-plate having spaced apertures
and a rigid body portion disposed in spaced rela
tion between the outer edges of and resting on the
shoulder portions of said sections, metallic means
50 connecting the pavement sections at a point be
low the shoulder portions, means including a
spring element exerting a substantially downward
the tread-plate.
v
5. In an expansion and contraction joint struc 20
ture for pavements and the like comprising, in
combination with a pair of spaced pavement sec- '
tions as de?ned in claim 1 in which a waterproof
gasket is inserted between the tread-plate and the
supporting shoulder and a sealing ?ller is placed
between the sides of the tread-plate and the
edges of the shoulder.
I
6. In an expansion and contraction joint struc
ture for pavements and the like comprising in
combination with a pair of spaced pavement sec 30
tions as de?ned in claim 2 in which a waterproof
gasket is inserted between the tread-plate and.
the supporting shoulder and. a sealing ?ller is
placed between the sides of the tread-plate and
the edges of the shoulder.
'
7. In an expansion and contraction joint struc
35
ture for pavements and the like comprising in
combination with a pair of spaced pavement sec
tions as de?ned in claim 3 in which a waterproof
gasket is inserted between the tread-plate and the 40
supporting shoulder and a sealing ?ller is placed
between the sides of the tread-plate and the edges
of the ‘shoulder.
8. In an expansion and contraction joint struc
ture for pavements and the like comprising in 45
combination with a pair of spaced pavement sec
tions as de?ned in claim 4 in which a Waterproof
gasket is inserted between the tread-plate and the
supporting shoulder and a sealing ?ller is placed
between the sides of the tread-plate and the edges
of the shoulder.
V
HAROLD W. GIFFIN.
50
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