U.S. patent number 3,849,958 [Application Number 05/388,470] was granted by the patent office on 1974-11-26 for expansion joint cover assembly.
This patent grant is currently assigned to Balco, Inc.. Invention is credited to Claude P. Balzer, Edward M. Corman, Michael D. Henry, Almer A. Reiff.
United States Patent |
3,849,958 |
Balzer , et al. |
November 26, 1974 |
EXPANSION JOINT COVER ASSEMBLY
Abstract
An expansion joint cover assembly for mounting on structural
sections disposed in spaced relation to define an elongated joint
therebetween includes a rigid bridging member which is generally
arch-shaped in cross section and of sufficient width to span the
joint to be covered and the bridging member has opposite side edge
portions each slidingly engaging an inclined surface of a base wall
of a respective one of a pair of base members each secured to a
respective structural section and having an end wall extending from
the respective base wall thereby defining a cavity to receive joint
filler material having opposite side edges each bonded to the end
wall of a respective one of the base members and the joint filler
material has a center portion thereof supported on the bridging
member whereby the bridging member is moved relative to an exposed
surface of the joint filler material in response to movement of the
structural sections to accommodate flow of said joint filler
material.
Inventors: |
Balzer; Claude P. (Wichita,
KS), Corman; Edward M. (Wichita, KS), Reiff; Almer A.
(Wichita, KS), Henry; Michael D. (Wichita, KS) |
Assignee: |
Balco, Inc. (Wichita,
KS)
|
Family
ID: |
23534242 |
Appl.
No.: |
05/388,470 |
Filed: |
August 15, 1973 |
Current U.S.
Class: |
52/396.05;
52/471; 52/468 |
Current CPC
Class: |
E04B
1/6804 (20130101) |
Current International
Class: |
E04B
1/68 (20060101); E04b 001/68 () |
Field of
Search: |
;52/396,468,471,573
;404/68,47,56,57,66 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Purser; Ernest R.
Assistant Examiner: Friedman; Carl D.
Attorney, Agent or Firm: Fishburn, Gold & Litman
Claims
What we claim and desire to secure by Letters Patent is:
1. An expansion joint cover assembly for structural sections
disposed in spaced relation and defining an elongated joint
therebetween, at least one of said sections including a horizontal
upper surface said assembly comprising:
a. first and second elongated base members each adapted to be
secured to a respective one of a first and second spaced structural
sections in opposed relation, said base members each having a
surface spaced below said upper surface and intersecting a joint
face of the respective structural section, said base member surface
being inclined relative to said upper surface;
b. an elongated bridging member for spanning a joint for the length
thereof between the structural sections, said bridging member
having opposite side edge portions each slidingly engaging said
surface of a respective one of said base members; and
c. a cured resilient joint filler material positioned for
supporting engagement by said bridging member and having opposite
side edges thereof each bonded to a respective one of said base
members, said joint filler material having an exposed surface
coplanar with said horizontal upper surface; said inclination of
the surfaces of the base members and the sliding engagement of said
side edge portions of bridging member therewith cooperating in
response to movement of the structural members for maintaining of
the upper surface of the filler material substantially level with
said horizontal upper surface of said sections.
2. An expansion joint cover assembly as set forth in claim 1
wherein:
a. said surface of each of said base members is inclined at an
acute angle relative to the exposed surface of the respective
structural section; and
b. said bridging member has a center portion positioned closer to
the upper surface of said joint filler material than said opposite
side edge portions thereof whereby the center portion of said
bridging member is moved relative to the exposed surface of said
joint filler material in response to relative movement of the
structural sections to accommodate flow of said joint filler
material and substantially maintain said upper surface level with
said upper surfaces of the sections.
3. An expansion joint cover assembly as set forth in claim 2
wherein:
a. said joint filler material has a center portion thereof bonded
to the center portion of said bridging member; and
b. means are positioned between adjacent surfaces of said joint
filler material and said bridging member to prevent bonding of said
joint filler material to said bridging member except at the
respective center portions thereof.
4. An expansion joint cover assembly for structural sections
disposed in spaced relation and defining an elongated joint
therebetween said sections including a horizontal upper surface,
said assembly comprising:
a. a pair of elongated base members each adapted to be secured to a
respective one of a pair of spaced structural sections in opposed
relation, said base members each having an end wall extending
substantially parallel with a joint face of the respective
structural section and a base wall intersecting the joint face of
the respective structural section, said base walls having upper
surfaces inclined at an acute angle to said upper surface of the
sections;
b. an elongated bridging member for spanning a joint between the
structural sections, said bridging member having opposite side edge
portions each slidingly engaging said upper surfaces of the base
wall of a respective one of said base members; and
c. a cured resilient joint filler material positioned in engagement
with said bridging member and having opposite side edges thereof
each bonded to said end wall of a respective one of said base
members, said joint filler material substantially filling the
cavity between said end walls and the bridging member and said
upper surfaces of the sections and having an exposed surface
substantially coplanar with respective upper surfaces of the
structural sections.
5. An expansion joint cover assembly as set forth in claim 4
wherein:
a. said bridging member has a center portion positioned closer to
the exposed surface of said joint filler, material than said
opposite side edge portions thereof; and
b. said base wall of each of said base members is angularly
inclined to define an acute angle with said end wall of said
respective base member whereby the center portion of said bridging
member is moved relative to the exposed surface of said joint
filler material in response to relative movement of the structural
sections to accommodate flow of said joint filler material.
6. An expansion joint cover assembly as set forth in claim 4
wherein:
a. said joint filler material has a center portion thereof bonded
to a center portion of said bridging member; and
b. means are positioned between adjacent surfaces of said joint
filler material and said bridging member to prevent bonding of said
joint filler material to said bridging member except at the
respective center portions thereof.
7. An expansion joint cover assembly as set forth in claim 6
wherein:
a. each of said base members has a face portion extending from said
base wall thereof and adapted to be substantially coplanar with the
joint face of the respective structural section;
b. said base wall of each of said base members is angularly
inclined to define an acute angle with said respective face
portion; and
c. said bridging member has a generally arch-shaped cross section
whereby the center portion of said bridging member is moved
relative to the exposed surface of said joint filler material in
response to relative movement of the structural sections to
accommodate flow of said joint filler material.
8. An expansion joint cover assembly for structural sections
disposed in spaced relation and defining an elongated joint
therebetween, said sections including a horizontal upper surface,
said assembly comprising:
a. a pair of elongated base members each having an end wall
extending substantially parallel with a joint face of a respective
one of a pair of spaced structural sections in opposed relation and
a base wall having an upper surface intersecting the joint face of
the respective structural section, said upper surface of the base
wall being spaced below said upper surface of the structural
section and inclined relative thereto;
b. means for securing each of said base members to a respective one
of the structural sections;
c. an elongated bridging member for spanning a joint between the
structural sections, said bridging member having opposite side edge
portions and each slidingly engaging the upper surface of the base
wall of a respective one of said base members, said bridging member
having a generally arch-shaped cross section; and
d. a cured resilient joint filler material positioned in engagement
with said bridging member and having opposite side edges thereof
each bonded to said end wall of a respective one of said base
members, said joint filler material substantially filling the space
between said end walls, bridging member and upper surfaces and
having an exposed surface substantially coplanar with respective
exposed surfaces of the structural sections, the opposite side
edges of said joint filler material, said inclination of said upper
surfaces of the base wall and sliding engagement of side edge
portions of the bridging member therewith cooperating to
substantially maintain the coplanar relationship of the exposed
surface of the filler material and upper surfaces of the sections
through expansion and contraction of the joint.
9. An expansion joint cover assembly as set forth in claim 8
wherein:
a. said joint filler material is a polyurethane elastomer;
b. the center portion of said joint filler material is bonded to
the center portion of said bridging member; and
c. means are positioned between adjacent surfaces of said joint
filler material and said bridging member to prevent bonding of said
joint filler material to said bridging member except at the
respective center portions thereof.
10. An expansion joint cover assembly as set forth in claim 9
wherein:
a. each of said base members has a face portion extending from said
base wall thereof and adapted to be substantially coplanar with the
joint face of the respective structural section;
b. said face portions each are adapted to be secured to the
respective structural section; and
c. said base wall of each of said base members is angularly
inclined to define an acute angle with said respective face portion
whereby the center portion of said bridging member is moved
relative to the exposed surface of said joint filler material in
response to relative movement of the structural sections to
accommodate flow of said joint filler material.
11. An expansion joint cover assembly as set forth in claim 8
including:
a. a face portion for each of said base members and extending from
said base wall thereof, said face portions each being adapted to be
substantially coplanar with the joint face of the respective
structural section; and
b. a flange extending from a free end of each of said face portions
and adapted to engage an interface between the respective
structural section and finishing material thereon.
Description
The present invention relates to expansion joint cover assemblies
for buildings and more particularly to an expansion joint cover
assembly for covering adjacent portions of spaced structural
sections which are prone to vary in position relative to each
other.
It is well known that in building sections of monolithic concrete,
concrete blocks, bricks, and the like, relatively long walls,
floors, and ceilings must have expansion joints to prevent cracks
due to expansion and contraction. Earth movement also necessitates
making portions of such building structures in sections with
expension joints therebetween to accommodate expansion,
contraction, and movement, even those caused by earthquake
tremor.
It has been the practice in the construction field, in constructing
buildings using a plurality of structural sections, to space the
individual sections of the building from each other whereby
portions of the structural sections confront each other across an
intermediate zone. Such an intentional zone or space is commonly
known as an expansion joint and allows relative movement of the
structural sections in response to temperature changes, earth
movement and the like, and thereby prevents stress in the sections
with the resulting cracking. The expansion joint or space between
the sections, if left exposed, is unsightly and prevents a complete
closure to the weather, therefore, it is desirable that an
expansion joint cover be provided which seals out weather,
deleterious material, and accommodates the relative movement of the
adjacent sections.
The principal objects of the present invention are: to provide an
expansion joint cover assembly for mounting on structural sections
disposed in spaced relation to define an elongated joint
therebetween wherein the assembly has a polyurethane elastomer
joint filler having a center portion thereof supported on a
bridging member having a raised center portion and opposite side
edge portions slidingly supported on inclined surfaces so that
relative movement of the structural sections effects movement of
the center portion of the bridging member relative to an exposed
surface of the joint filler material to accommodate flow thereof;
to provide such an expansion joint cover assembly adapted to
maintain substantial surface continuity across the elongated joint
between adjacent structural sections; to provide such an expansion
joint cover assembly adapted to support loads passing across the
elongated joint; to provide such an expansion joint cover assembly
having points of weakness adjacent the bond of a center portion of
the joint filler material to the enlarged center portion of the
bridging member to permit stretching of the filler material without
breaking bond at the side edges thereof; to provide such an
expansion joint cover assembly wherein as the joint contracts the
bridging member is moved along the slopes of the respective base
members to move the center portion of the bridging member away from
the exposed face of the joint filler material and thereby
increasing the space available for the center portion of the joint
filler material to flow; to provide such an expansion joint cover
assembly such that when the joint expands the joint filler material
stretches adjacent the center area thereof and the bridging member
moves along the slopes of the base member to move the center
portion of the bridging member toward the exposed face of the joint
filler material and thereby maintain constant support for the joint
filler material; and to provide such an expansion joint cover
assembly which is economical to manufacture, easily installed,
convenient to repair or replace, which can be mounted on exterior
or interior surfaces, which is decorative when installed, which
permits multiple, directional relative movement of the building
sections at the joint therebetween and which is particularly well
adapted for the proposed use.
Other objects and advantages of this invention will become apparent
from the following description taken into connection with the
accompanying drawings wherein are set forth, by way of illustration
and example, certain embodiments of this invention.
The drawings constitute a part of this specification and include an
exemplary embodiment of the present invention and illustrate
various objects and features of the expansion joint cover
assembly.
FIG. 1 is a partial perspective view of an expansion joint cover
assembly embodying features of the present invention and shown in
place of spaced structural sections and in covering relation to an
expansion joint between the spaced structural sections.
FIG. 2 is an exploded perspective view showing the components of
the expansion joint cover assembly.
FIG. 3 is a transverse sectional view taken on line 3--3, FIG.
1.
Referring more in detail to the drawings:
As required, detailed embodiments of the present invention are
disclosed herein, however, it is to be understood that the
disclosed embodiments are merely exemplary of the invention which
may be embodied in various forms, therefore, specific structural
and functional details disclosed herein are not to be interpreted
as limiting but merely as a basis for the claims and as a
representative basis for teaching one skilled in the art to
variously employ the present invention in virtually any
appropriately detailed structure.
In the disclosed embodiment of the present invention, the reference
numeral 1 generally designates an expansion joint cover assembly
for mounting on structural sections 2 and 3 disposed in spaced
relation to define an elongated joint 4 therebetween. The expansion
joint cover assembly 1 includes a bridging member 5 of sufficient
strength and width to span the joint 4 to be covered and the
bridging member 5 has opposite side edge portions 6 and 7 slidingly
engaging inclined surfaces 8' and 9' of base walls 8 and 9
respectively of a pair of base members 10 and 11 respectively which
are secured to the structural sections 2 and 3. End walls 12 and 13
extend from and substantially normal to the base walls 8 and 9
respectively and cooperate with the bridging member 5 to define a
receptacle or cavity 14 adapted to receive joint filler material 15
having opposite side edges 16 and 17 bonded to the end walls 12 and
13 respectively of the base members 10 and 11. The joint filler
material 15 has a center portion 18 thereof supported on an
enlarged center portion of the bridging member 5 and the bridging
member 5 is moved relative to an exposed surface 19 of the joint
filler material 15 is response to movement of the structural
sections 2 and 3 to accommodate flow of said filler material
15.
Expansion joints in building construction are used primarily to
permit expansion and contraction of the structural sections which
result from changes in temperature and to accommodate earth
movement and the like. Expansion joints are used between sections
of floors, between sections of walls, between sections of ceilings,
between walls and ceilings, and at the intersection of walls and
floors. The expansion joint cover assembly of the present invention
is capable of being used for all the various types of expansion
joints. The expansion joint cover assembly must be capable of
expanding and contracting throughout a selected design range.
In the illustrated structure, the end walls 12 and 13 of the base
members 10 and 11 are substantially perpendicular or normal to
exposed surfaces 20 and 21 of the structural sections 2 and 3
respectively and the end walls 12 and 13 are substantially parallel
with joint faces or surfaces 22 and 23 of the structural sections 2
and 3 respectively. A rear or hidden face of each of the end walls
12 and 13 is adapted to be anchored to the respective structural
section as by a plurality of spaced projections extending into the
respective sections.
The base walls 8 and 9 intersect the joint faces 22 and 23
respectively and the base walls 8 and 9 have respective surfaces 8'
and 9' which slidingly support the side edge portions 6 and 7 of
the bridging member 5 and the illustrated surfaces 8' and 9' are
inclined relative to the exposed surfaces 20 and 21 of the
structural section 2 and 3 respectively. The inclined surfaces 8'
and 9' of the base walls 8 and 9 may be any desired shape, such as
planar, convex, or the like, which varies the spacing of the
respective surface relative to the exposed surface 19 of the joint
filler material 15 and relative to the exposed surfaces 20 and 21
of the structural sections 2 and 3 respectively. In the illustrated
embodiment, the surfaces are planar and define an acute angle
between same and the respective end walls 12 and 13 whereby a
center portion or the bridging member 5 is moved relative to the
exposed surface 19 of the joint filler material 15 in response to
movement of the structural sections 2 and 3 to thereby accommodate
flow of the joint filler material 15.
When the exposed surfaces 20 and 21 of the structural sections 2
and 3 are to be formed of finishing or surfacing materials 24 and
25 respectively, face portions 26 and 27 are formed in the base
members 10 and 11 respectively and the face portions 26 and 27
extend from the base walls 8 and 9 and are adapted to be
substantially coplanar with the joint faces 22 and 23 of the
structural sections 2 and 3 respectively. The face portions 26 and
27 of the base members 10 and 11 are substantially parallel with
the end walls 12 and 13 whereby the inclined surface of the base
walls 8 and 9 define an acute angle with the face portions 26 and
27 respectively, which is equal to the acute angle between the base
walls 8 and 9 and the end walls 12 and 13 respectively.
The base members 10 and 11 are adapted to be secured to the
structural sections 2 and 3 or to the finishing materials 24 and 25
respectively applied thereto. In the illustrated structure, spaced
flanges or ribs 28 and 29 extend from the rear or hidden face of
the respective base walls and face portions and cooperate to define
an elongated groove in each of the base members 10 and 11 which is
adapted to receive suitable longitudinally spaced anchors 30
therein. The anchors 30 are positioned so that they will be covered
by the material forming the respective structural section or
finishing material thereon and, therefore, maintain the respective
base member rigidly in place at the edge of the elongated joint
4.
The face portions 26 and 27 have enlarged portions 31 and 32
respectively to define extensions of the base walls 8 and 9 into
the elongated joint 4 between the structural sections 2 and 3. The
enlarged portions 31 and 32 each have surfaces defining elongated
grooves 33 and 34 respectively therein. The grooves 33 and 34 are
positioned in opposed relation, for a purpose later described.
Flanges 35 and 36 extend from a free end of the face portions 26
and 27 respectively and are adapted to engage interfaces 37 and 38
between the structural section 2 and the finishing material 24 and
the structural section 3 and the finishing material 25
respectively. The spacing between the flanges 35 and 36 and exposed
or free edges 39 and 40 of the end walls 12 and 13 respectively
corresponds with the thickness of the finishing materials 24 and 25
on the structural sections 2 and 3.
The bridging member 5 is adapted to support a load applied to the
joint filler material 15, such as a wheel or the like passing over
the elongated joint 4. The bridging member 5 is preferably a
substantially rigid member having sufficient strength and width to
span the elongated joint 4 throughout a selected design range and
has the side edge portion 6 and 7 thereof in sliding engagement
with the base walls 8 and 9 respectively of the base members 10 and
11. The center portion of the bridging member 5 may be any desired
shape extending toward the exposed surface 19 of the joint filler
material 15. The illustrated bridging member 5 has a generally
arch-shaped cross section with the side edge portion 6 and 7
depending from an arcuate portion which defines the arch-shape. A
center portion 41 of the bridging member 5 is centered between the
structural section 2 and 3 and is thereby positioned at the center
of the elongated joint 4. The center portion 41 of the bridging
member 5 supports the center portion 18 of the joint filler
material 15 and the center portion 18 is bonded to the center
portion 41.
The joint filler material 15 is supported by and positioned in
engagement with the bridging member 5 and has the side edges 16 and
17 thereof bonded to the end walls 12 and 13 of the base members 10
and 11 respectively. The joint filler material 15 has the exposed
surface 19 thereof substantially coplanar with the exposed surfaces
20 and 21 of the structural sections 2 and 3 to thereby provide
surface continuity across the elongated joint 4. The opposite side
edge portions of the joint filler material 15 have a greater
thickness than the center portion 18 of the joint filler material
15. The joint filler material 15 is preferably an elastomer or a
synthetic elastomer having good resistance to abrasion, oil and
other chemicals, and having a high tensile strength, such as
polyurethane rubber. The joint material also preferably has a shore
A durometer value in the range of 60 to 70.
It is desirable to prevent bond between the joint filler material
15 and the bridging member 5 except between the center portion 41
of the bridging member 5 and the center portion 18 of the joint
filler material 15, therefore, suitable means are positioned
between adjacent surfaces of the joint filler material 15 and the
bridging member 5 to prevent bonding therebetween except at the
center portions thereof. Paper, plastic thin metal, and like strips
have been found to be sufficient to prevent bond between the joint
filler material 15 and the bridging member 5.
A suitable flexible moisture shield 42 may be included in the
assembly and has side edges 43 and 44 adapted to be received in the
grooves 33 and 34 respectively of the base members 10 and 11.
The bridging member 5 and the base members 10 and 11 are preferably
formed of metal by extrusion through suitable dies. The anchors 30
are also preferably metal and may also be formed by extrusion or
any other suitable method. Aluminum has been found to provide
sufficient strength and lightness in weight for the rigid
components of the expansion joint assembly 1.
Assembly of the expansion joint cover assembly may be in a factory
or during construction of a building. When the base members 10 and
11 are to be installed on a structural section without finishing
material thereon, the base members 10 and 11 are suitably
positioned in forms for the structural sections and suitable
anchors 30 are longitudinally spaced along the grooves defined by
the ribs 28 and 29. After the structural sections have cured and
the forms have been removed, the moisture shield 42, when used, has
the edge portions 43 and 44 thereof installed in the grooves 33 and
34 in the enlarged portion 31 and 32 respectively. The bridging
member 5 is then positioned with the edge portions 6 and 7 thereof
in engagement with the base walls 8 and 9 respectively and the
center portion 41 of the bridging member 5 is centered between the
face portions 26 and 27. Suitable bond preventing material 45, such
as paper, plastic, thin metal or like strips, is positioned to
cover all of the bridging member 5 except the center portion 41
thereof. The bond preventing material may also cover exposed
surfaces of the walls 8 and 9. The center portion 41 of the
bridging member 5 and the end walls 12 and 13 of the base members
10 and 11 are preferably cleaned and primed with a suitable
compound or adhesive. The joint filler material 15 is then poured
into the cavity 14 defined by the end walls 12 and 13, exposed
portions of the base walls 8 and 9, and the bridging member 5. When
finishing material 24 and 25 is to be placed on the structural
sections 2 and 3, the flanges 35 and 36 are positioned in
engagement with the interfaces 37 and 38 respectively and the
anchors 30 are properly positioned in the grooves defined by the
ribs or flanges 28 and 29. The base members 10 and 11 are suitably
spaced apart, as by blocking or the like, (not shown) and the
finishing material is installed on the structural sections 2 and 3
respectively. The moisture shield 42, bridging member 5, bond
preventing material, and joint filler material 15 are then
installed as previously described.
It is to be understood that while I have illustrated and described
one form of my invention, it is not to be limited to the specific
form or arrangement of parts herein described and shown.
* * * * *