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Патент USA US3094925

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June 25, 1963
Filed May 7, 1962
2 Sheets-Sheet 1
gf l
/ .
June 25, 1963
Filed May 7, 1962
2 Sheets-Sheet 2
United States Patent()
Patented June 25, 1963
spaced apart to show the alternate series of compression
members transferring the imposed load as shown in FIG
URES l and 2.
In FlG. 1, the ends of the adjacent slabs are numbered
10 and 11. The slab ends 10 and 11 are joined, in the
Morris Berman, G1120. Box 115, New York, NY.
Filed May 7, 1962, Ser. No. 192,774
6 Ciaims. (Cl. 94---1S)
invention, in a manner which causes loads applied to one
slab end to be transferred to the other. The load trans
'Ihis invention relates to expansion-contraction joints
fer mechanism is indicated generally by the numeral 12
and comprises a pair of plates 13l and 14 which are spaced
for transferring applied loads from the end of one con
crete slab to the contiguous end of an adjacent slab.
10 from one another across the space separating the slab
In the prior art such load transfer joints were fre
ends 10 and 11.
quently formed with doWels each having one half íixed in
The plates 13 and 14 are anchored to the respective
one slab end and the other half greased and slidable
slab ends 1G and 11, and appropriate means for this pur
within the adjacent slab end through casting over dowel.
pose are shown in FIG. 1. Thus, plates -13 and 14 may
This prior arrangement Was disadvantageous in that mis
have welded thereto Ibond bars 15 and may also have
alignment of the dowels or drying up or freezing of the
wire mesh ‘16. Alternatively, the plates themselves may
lubricant within the holes would cause excessive friction
be deformed to provide the desired anchoring.
or even complete binding of the dowels. 'I‘his in turn
Each of the plates 13 and 14 are provided with in
would either hinder or completely prevent expanding or
wardly facing upper shoulder elements 17 and lower
contracting movements «of the slab ends with tempera 20 shoulder elements 18. 'Ihe upper shoulder elements 17
ture so as to cause breakage of the concrete slabs.
face downwardly and the lower shoulder elements 18 face
Other types of joints known in the prior art also pro
upwardly. As shown in FIG. 1, the upper and lower
duced excessive friction, irnpeding free relative lateral
shoulder elements 17 and .1S are grooved and are unitary
movement of the adjacent slab ends, or were too com~
with or may be attached to the plates `13` and 14. More-`
plicated, expensive, unreliable, or otherwise disadvan 25 over, the upper and llower shoulder elements 17 and 18
are vertically spaced apart and compression elements or
It is therefore a primary object «of the present inven
struts 19 extend between the upper shoulder elements of
tion to provide a simple, effective and durable joint for
'one plate and the lower shoulder elements of the other
transferring loads between adjacent slab ends and which
will assure relatively free lateral expanding and contract 30
As will be apparent, FIG. 1 is a cross-section and only
ing movements of the slab ends.
one of the upper shoulder elements 17 and only one of
My copending application, Serial 182,5011, filed March
the lower shoulder elements can Íbe clearly seen, the re
26, 1962 also shows means for transmitting loads be
maining shoulder elements being out of the plane of the
tween adjoining sections of expansion-contraction joints.
section. Thus, and in FIG. 1, a load imposed upon slab
Another object is to provide a novel joint construc 35 end 16 is transferred to the slab end 11 by means of plate
tion of the character described and forming a pocket or
13, strut 19 and plate 14, the load being transmitted
mold for Afiller material at the top of the space between
through the shoulder elements 17 and 18. The transfer
the slabs.
of imposed load from slab end 111 to slab end 12 is shown
Still another important feature of the invention resides
in FIG. 2.
in an arrangement whereby the pocket structure and ñller 40
As is well known, expansion and contraction joints be
material therein may be quickly and easily removed when
tween slab ends requires that the slab ends be permitted
the material requires replacement.
, Another object of the present invention is to provide
a joint having cap plates which serve to mold the con
to move laterally to accommodate changes in the width
of the space between the slab ends as the slabs expand
and contract. Thus, the compression elements 19 are
these upper edges.
ments being preferably rounded, as shown, to provide
crete-to form the slab ends with rounded upper edges 45 pivotally seated in the shoulder elements `17 and 18, the
so as to eliminate the prior burdensome need for sawing
ends of the compression elements and the shoulder ele
t Other objects and advantages are either inherent in the
the desired pivotal movement.
structure ‘disclosed or will become apparent to those
The invention is particularly illustrated in FIG. 1 in
skilled in the art as the detailed description proceeds in
its application to concrete slabs which are poured about
connection with the accompanying drawings wherein:
iFIG. 1 is a vertical section of a joint between slab ends
along line 1--1 of FIG. 6` in which a compression mem
ber enga-ges one series of non-retractable shoulder mem
bers; this figure also shows the joint plates and dia
FIG. 2 shows an adjacent compression member engaging a second series of shoulder members as seen in
the plates 13` and 14 to cause the anchoring members 15
and'16 to become embedded within the concrete slab
which is formed when the conc-rete sets. In this connec
tion, it is common practice to ñll the joint with a weather~
proof elastic material and the invention includes means
to facilitate the formation of the concrete slab end as
well as means to hold the elastic material in place and
to remove it when desired.
Referring to FIGS. l and 2, the upper ends of the plates
vertical section along the line 2_2 of FIG. 6, and in 60
13 and 14 are slotted, as indicated at 20, and retractable
addition a slab forming cap inserted between the filler
joint filler container plates 21 are placed in the slots 20
plates at the top thereof so as to form a curve at the
and before the concrete is poured. Also, the cap` plates
upper edges of the slabs.
22, as shown in FIG. 2, may be positioned at the top of
FIG. 3 is a vertical sectional View of a modiñed form
of joint wherein several of the parts are readily remov 65 the plates 2l to cause the poured concrete to'assume a
Arounded upper edge. The 4filler container plates 21 carry
able for inspection and repair;
a diaphragm 23 which forms a filler-receiving pocket 24.
,FIG 4 isV a horizontal sectional view taken on line
The elastic Weatherproofing material may be placed
4--4 of FIG. 3;
in the pocket 24 either before or after the concrete slab
FIG. 5 is an enlarged vertical sectional view showing
is poured.
a portion of the structure of FIG. 3 but with the screw, 70
After the slabs are poured, the cap plates 22 are re
bushing and other parts shown in section; and
moved to reveal the rounded upper edges 25 of the ad
FIG. 6 is a plan View of the joint with the side plates
jacent slabs.
When it is desired to remove the elastic filler, the con
tainer plates 21 are extracted upwardly by force applied
or Wrench and screw 32 is unscrewed from bushing seg
ments 3l), 31 and removed upwardly from the joint.
Upper shoulder elements 17a and struts 19 are then free
to the inwardly facing hook iianges 26 which are formed
to be removed, thereby providing access to the various
at the upper end of the Vcontainer plates 21.
parts and to the joint to the lower shoulder.
The plates 21 may be pried loose from the concrete
lt is to be understood that the specific embodiments
to facilitate extraction.
disclosed herein are merely illustrative of several of the
To facilitate adhesion of the top of plates 21 to the
many forms which the invention may take in practice
concrete, a bond material may be applied at the tcp of
without departing from the scope thereof as delineated
these plates. The remainder of the plates Z1 are greased
on the slab sides for easier retraction for filler renewal. 10 in the appended claims, and that the claims are to be
construed as broadly as permitted by the prior art.
Referring now to FIGS. 3 to 5, there is disclosed a
It is understood that any suitable material may be
modified form 12a of the invention wherein the several
substituted for the concrete slabs referred to herein and
parts may be removed `for inspection «and repair. In
the specifications and claims shall be so construed. It
these figures those elements which are identical to corre
is `also understood that the term “plates” Kas used in these
sponding elements of the previous modification 12 of
specifications and claims refer to any structural forms
FIGS. 1 and 2 are identified by the same reference nu
used to transmit loads. The term “sla ” also includes
merals and will not b‘e further described.
licor or roof construction of any material.
Plates 13a, 14a are similar to plates 13, 14 except that
I claim:
the yformer are provided with segment-ally -cylindrical
l. Load transfer mechanism adapted to be positioned
recesses for receiving bushing segments 30, 31 secured 20
«between spaced slab endsfor transferring applied loads
ythereto as by welding or other suitable means. Seg
from one slab end to the other comprising, a pair of
ments 30, 31 are internally threaded to receive an ex
spaced plates including means for anchoring said plates
ternally threaded screw 32. A transverse slot 33 is
to the respective slab ends, each ‘of said plates being pro
formed in the upper end of screw 32 for engagement by
a screwdriver bit, or a bolt head (not shown) may be 25 vided with laterally alternating inwardly projecting upper
provided as an alternative.
and lower shoulder elements, said upper and lower shoul
der elements being vertically spaced and having seats
Each of the upper shoulder elements 17a, instead of
facing downwardly and upwardly respectively, and com
being integral with one of the plates 13a, 14a as in the
pression elements extending between the upper shoulder
previous modification, is separate therefrom and movable
with respect thereto. The lower shoulder elements 13 30 elements of each of said plates and the lower shoulder
elements of the other plate, said compression elements
are formed integral with plates 13a, 14a as described
being pivotally seated in said shoulder seats.
above. That is, in one vertical plane the element 18 is
integral with Vone plate 13a whereas the next element 18
2. Load transfer mechanism as recited in claim 1 in
in an adjacent vertical plane is integral with the other
which said upper and lower shoulder seats fare rounded
plate 14a, the elements altern-ating in this manner in 35 and said compression elements are struts formed with
the direction perpendicular to the plane of the drawing.
The upper end of strut 19 is pivotally mounted within
the groove formed in the lower surface of upper shoulder
element 17a and the lower end of strut 19 is similarly
rounded opposite ends, said rounded ends of said struts
being freely seated for pivotal movement within said
rounded upper and lower shoulder seats.
3. Load transfer mechanism as recited in claim l in
_ mounted to lower shoulder element 18. In assembly, 40 which the upper edges of said plates are -formed with
downwardly extending slots, joint filler container plates
screw 32 is rotated until its lower end presses downwardly
upon shoulder element 17a which in turn exerts a com
-seated in said downwardly extending slots, the upper
edges of said joint iiller container plates being formed
pressive force «on strut 19. Continued tightening of screw
with inwardly facing hooks, said joint iiller container
32 causes the upper surfaces of the threads of screw 32
to press against the lower surfaces of the threads of bush 45 plates together carrying 'a diaphragm for receiving elastic
ing segments 30, 31, with clearance spaces between the
lower surfaces of the threads of screw 32 and the upper
surfaces of the threads of bushing segments 30, 31. The
screw threads should project suiiiciently from the shank
to permit adequate joint expansion without disengage
ment of the screw from the bushing.
It will thus «be seen that a load on the left concrete
slab 10 will be transferred lto the right slab 1-'1 in the
following manner: The lower thread surfaces of the left
bushing segment 30 will press downwardly against the
upper thread surfaces of screw 32 to transmit the load to
the latter. However, the load will not be transmitted
directly from screw 32 to the right bushing segment 31
because of the clearance spaces between the lower thread
weatherproofing material.
4. A joint construction for :transferring applied loads
tf1-om the end of `one slab to the contiguous end of an ad
jacent slab, said joint construction comprising a pair of
50 plates, means ,for securing each of said plates toy a respec
tive one of said slab ends, a iinst series of «spaced upper
shoulder elements on one of said plates, a lirst series of
spaced lower shoulder elements each on the other of said
plates located below a respective one of said upper shoul
der elements, a iìrst series of compression elements each
extending between [and engaging a respective one of said
first series of upper shoulder elements and the respective
lower shoulder element located therebeneath for trans
rmtting ta «downward force from said first series of upper
surfaces of screw 32 and the upper thread surfaces of 60 shoulder elements to sai-d first series of lower shoulder
bushing segment 31. Screw 32 is thus able to undergo
elements so `as to transfer a load from said one plate to
sufficient downward movement with respect to bushing
said other plate, a second series of spaced upper shoulder
elements on said other plate, a second series of spaced
lower shoulder element-s on said one plate each located
slab 11 through strut 19, lower shoulder element 18, 65 below Ia respective one of said second series of upper
and plate 14a.
segment 31 to transmit the load to upper shoulder ele
ment 17a from which the load is transferred `to the right
The load is transmitted in the same manner from
right slab 11 to left slab 10 in the alternate vertical planes
where lower shoulder elements 118 are integral with left
shoulder elements, said second series of shoulder elements
:being staggered relative to said iirst 'series Iof shoulder
`elements land la second series `of compression ele
ments each extending between and engaging a respective
plate 13a instead of right plate 14a.
70 one lof said second series of upper shoulder elements and
The several parts may be quickly and easily removed
the respective lower shoulder element located therebe
for inspection and repair by the following procedure.
neath :for transmitting -a downward force `from said second
Filler container plates 21 and the filler material therebe
series of upper shoulder elements to said second Series
tween are first removed in the manner described above.
of lower shoulder elements so as to transfer a load from
Then slot 33 of screw 32 is lengaged by a screwdriver 75 said other plate to said one plate, said ñrst and second
ing segments of >a respective pair and in threaded enga-ge
ment therewith, the upper shoulder elements being ver
tically slidable between the plates, the lower end of each
of said screws engaging its respective upper shoulder ele
compression elements crossing each other in staggered
relationship whereby said compression elements pivotally
engage said shoulder elements.
5. A joint construction 'as defined in claim 4 wherein
ment to transmit :a downward force thereto, the bushing
said means for connecting said upper shoulder elements
segment threads having lower surfaces engaging the upper
to the plates comprises a plurality of pairs of bushing seg
surfaces of the external lthreads of said screws and hav
»ments each pair being associated with a respective one
ing upper surfaces spaced downwardly from the lower
of said upper shoulder elements, each segment being se
surfaces of said external threads of said screws, the upper
cured to a respective plate ,and having internal threads, a
plurality fof externally threaded screws each extending be 10 end of each screw having tool engageable means, whereby
the screws may be unscrewed from the bushing segments
tween bushing segments of a respective pair and in
to permit removal of the upper shoulder lelements and the
threaded engagement therewith, the upper shoulder ele
compression elements for inspection Aand repair of the
rnents lbeing movable with respect to the plates, the lower
joint and said elme-nts removed therefrom.
end `of each `of said screws ‘engaging its respective upper
shoulder element to transmit a downward torce thereto, 15
References Cited in the ñle of this patent
whereby the screws may be unscrewed from the bushing
segments to permit removal of the upper shoulder ele
ments and »the compression elements for inspection and
Gage _______________ __ Oct. 28, 1919
repair yot the joint and said elements removed therefrom.
6. A joint construction as defined in claim 4 further 20
comprising a plurality of pairs of bushing segments each
pair being ‘associ-ated with a respective one iof said upper
shoulder elements, each segment being secured to a -re
spective plate »and having internal threads, a plurality of
externally threaded screws each extending between bush
Plym _______________ __ Dec. 29,
Fremont ____________ __ Sept. 21,
Schulz ______________ __ Feb. 15,
Webb _________________ __ Dec. l2,
Heltze-l ______________ _- Sep-t. 28,
Webb _______________ __ Mar. 18,
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