U.S. patent number 3,670,470 [Application Number 05/099,363] was granted by the patent office on 1972-06-20 for roof joint cover assembly.
This patent grant is currently assigned to Architectural Art Mfg., Inc.. Invention is credited to Wenzel W. Thom.
United States Patent |
3,670,470 |
Thom |
June 20, 1972 |
ROOF JOINT COVER ASSEMBLY
Abstract
An expansion joint cover for effectively sealing the joint
between two shiftable roof sections while permitting the natural
expansion and contraction of the latter which employs a cover plate
resiliently mounted on one of a pair of support members on opposite
sides of the joint with a bolt and coil spring therearound so as to
bias the cover into a sealing position on both supports, the bolt
and spring being positioned proximal to the joint between the two
sections and providing a balanced sealing action on the respective
supports.
Inventors: |
Thom; Wenzel W. (Wichita,
KS) |
Assignee: |
Architectural Art Mfg., Inc.
(Wichita, KS)
|
Family
ID: |
22274642 |
Appl.
No.: |
05/099,363 |
Filed: |
December 18, 1970 |
Current U.S.
Class: |
52/395; 52/58;
52/467; 52/396.07 |
Current CPC
Class: |
E04D
13/151 (20130101) |
Current International
Class: |
E04D
13/15 (20060101); E04d 003/38 (); E04f
015/14 () |
Field of
Search: |
;52/573,467,395,393,396,58,463 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Faw, Jr.; Price C.
Claims
Having thus described the invention, what is claimed as new and
desired to be secured by Letters Patent is:
1. A roof joint cover assembly for structural sections cooperable
to present a roof for a building and including a pair of spaced
sections defining a joint therebetween, said assembly
comprising:
a first component adapted to be secured to one of the structural
sections adjacent the joint defined thereby and including a first
part configured to generally complementally engage a surface
portion of said one structural section, and
a second part joined to said first part and extending away from the
latter in a direction toward the joint;
a second component adapted to be secured to the other structural
section of the pair thereof and having a segment extending away
therefrom, said segment being provided with a terminal edge remote
from the other structural section terminating in substantial
alignment with said second part of the first component;
a cover plate overlying said parts of the first component in spaced
relationship therefrom and engaging the terminal edge of said
segment of the second component and the first part of said first
component;
connector means on the cover plate and extending through the second
part of said first component for pivoting movement relative
thereto; and
resilient means on the connector and engaging said second part of
the first components for biasing the cover plate into tight
engagement with said first part of the first component and the
segment of said second component.
2. The invention of claim 1, wherein said cover plate is
channel-like in configuration with the skirts on opposite sides
thereof extending generally downwardly toward said roof in
overlying relationship with corresponding portions of the segment
of said second component and the first part of said first
component.
3. The invention of claim 1, wherein said first and second
components are of generally inverted T-shape configuration and are
each provided with an integral flashing member on their respective
extremities remote from said joint, said flashing members extending
generally downwardly toward said roof and outwardly from said joint
along corresponding structural sections in spaced overlying
relationship therewith.
4. The invention of claim 1, wherein said second part of the first
component is provided with a surface remote from said one
structural section in substantial parallelism with the latter and
with said outer edge of the segment of said second component, said
surface being adapted to engage said cover plate.
5. The invention of claim 4, wherein said surface of the second
part of the first component and said terminal edge of the segment
of said second component are each provided with a compressible
sealing member extending along their respective lengths and
disposed to engage said cover plate and effect a seal
therebetween.
6. The invention of claim 1, wherein said connector means includes
a bolt having a head thereon and a nut threaded on said bolt below
said second part of said first component, said resilient means on
the connector means including a coil spring surrounding said bolt
and engaging said nut and said second part of the first
component.
7. The invention of claim 1, wherein both of said components and
said cover plate are elongated and extend along the length of the
joint, said connector means being provided at spaced intervals
along the length of the cover plate.
8. The invention of claim 1, wherein said first component is
generally L-shaped and is provided with a finger unit extending
generally outwardly from said first part of said first component
toward said joint and downwardly toward said second part of said
first component, said finger unit and said first part defining a
channel within said first component.
9. The invention of claim 8, wherein said second component is
generally of inverted T-shaped configuration and provided with an
integral flashing member on an extremity remote from said joint,
said flashing member extending generally downwardly toward said
roof and outwardly from said joint along its corresponding
structural section in spaced overlying relationship therewith.
10. The invention of claim 9, wherein said cover plate is generally
of Z-shape configuration with a first skirt on one of the
extremities of said plate extending generally downwardly toward
said roof in overlying relationship with a portion of the segment
of said second component and with a second skirt on another
extremity of said plate extending generally upwardly into said
channel between said finger unit and the first part of said first
component with the terminal end of said second skirt engaging the
inner surface of said first component at the point of juncture of
said finger unit with the first part of said first component.
11. The invention of claim 10, wherein said second skirt is
provided with a bead on the terminal end thereof adapted to be
complementally received within a corresponding bead-shaped slot
provided within the inner surface of said first component at the
point of juncture of said finger unit with the first part of said
first component, the distance across the opening of said slot being
smaller than the cross-sectional diameter of said bead in order to
secure the terminal end of said second skirt to said first
component while permitting pivotal movement relative thereto.
12. The invention of claim 10, wherein said first part of said
first component is provided with compressible sealing means
extending along the length thereof and adapted to engage said one
structural section and effect a seal between the latter and said
first component
13. The invention of claim 12, wherein said terminal edge of the
segment of said second component is provided with compressible
sealing means extending along the length thereof and disposed to
engage said cover plate and effect a seal therebetween.
14. The invention of claim 10, wherein said connector means
includes a bolt having a head thereon and a nut threaded on said
bolt below said second part of said first component, said resilient
means on the connector means includes a coil spring surrounding
said bolt and engaging said nut and said second part of the first
component.
15. The invention of claim 10, wherein both of said components and
said cover plate are elongated and extend along the length of the
joint, said connector means being provided at spaced intervals
along the length of the cover plate.
Description
This invention relates to the field of expansion joint covers and,
more particularly, to an improved expansion joint cover for sealing
the joint between two shiftable roof sections which provides
increased sealing efficiency without interfering with the natural
expansion and contraction of the roof sections.
The joints between a pair of horizontal roof sections and between a
horizontal section and a vertical section such as a parapet wall,
have conventionally been sealed against the elements by a variety
of cover devices. These devices allow the various roof sections to
shift back and forth and up and down relatively to each other
during the expansion and contraction of the roof sections during
varying temperature conditions with real success being obtained
only at high cost.
For years, flexible flashing material has been bent to provide
overlapping, interleaved units adapted to be nailed to respective
roof sections and the roofing material laid over the nailed edges
of the flashing units. During expansion and contraction of the roof
sections, the interleaved portions of the units move relatively to
retain the seal therebetween. Although this type of assembly
enjoyed some commercial success, primarily because it was the only
structure available for general use, fabrication and installation
of the units was expensive and time consuming, and the structure
was susceptible to damage by loads thereon, particularly if walked
upon by workmen on the roof.
Other devices which allow for the expansion and contraction of the
roof sections use an extruded cover plate assembly to span the
distance between the roof sections and to seal the joint. One side
of the plate is securely attached to one of the roof sections or to
one of the supports for the cover while the opposite side engages a
support on the other roof section in an overlapping relationship
therewith. The cover plate, which has a limited degree of
flexibility is mounted in covering position over the joint in a
slightly flexed condition in such a manner that the natural
flection of the cover provides the necessary clamping force and
sealing on each of the supports for the respective roof sections.
This arrangement, however, is not a satisfactory solution in all
applications due to the limited range through which the cover may
be flexed. If the cover is flexed too far in one direction it will
lack the necessary clamping force to provide an efficient seal, or
if the cover is flexed too far in the opposite direction, the cover
may become permanently bent or even break.
Other prior devices which allow for the contraction and expansion
of the various roof sections have used leaf springs spanning the
joint and joined to an overlying cover plate in an attempt to
provide the necessary clamping force to effect a seal between the
cover and the respective supports for the cover assembly. The leaf
springs have leg portions which engage opposite support members on
respective roof sections defining the joint therebetween. Fastening
means is used to connect the leaf springs to the cover member. This
arrangement suffers from many practical fabrication, installation,
operation and excessive cost problems with the most serious
involving inability of the leaf spring construction to force the
cover plate into positive sealing engagement with cover supports,
particularly when the joint is of considerable width, under
pressure sufficient to assure a seal along the entire length of the
joint under all conditions of movement of the roof sections. While
this arrangement offers a greater degree of movement than does the
other arrangement mentioned above, it still does not provide a
satisfactory and balanced sealing action during the expansion and
contraction movement of the various sections.
Accordingly, it is the primary object of this invention to provide
an expansion joint cover assembly for sealing the joint between a
pair of roof sections which provides greater sealing efficiency at
a practical cost than that obtainable from prior devices during the
natural contraction and expansion of the roof sections.
Another important object of this invention is to provide such a
cover assembly which utilizes means other than the natural flection
of a cover plate to yieldably bias the cover into its sealing
position.
Another important object of this invention is to provide such a
cover assembly which utilizes spring means for biasing the cover
plate into sealing engagement with opposed support members
comprising a series of bolts projecting downwardly from the cover
plate and extending through a support bracket on one of the support
members and a coil spring surrounding each bolt and trapped between
the bracket and retainer on a corresponding bolt to firmly force
the cover plate down against the support members and assure a
uniform clamping force and a balanced sealing action on both roof
section support members of the cover assembly.
Still another important object of this invention is to provide a
cover assembly as described above having a separate cover element
for spanning the distance between a pair of upright support units
on opposite sides of the joint wherein the element is yieldably
biased into engagement with the supports by coil spring operated
attaching means mounted on the element in a position proximal to
the joint.
A further important object of the invention is to provide such a
cover assembly which may be economically extruded by conventional
procedures and which provides a maximum degree of strength,
weather-sealing characteristics, and installation efficiency.
In the drawing:
FIG. 1 is a fragmentary, perspective view of two embodiments of a
roof joint cover embodying the principles of my invention, shown in
their normal operative relationship in sealing relationship to a
joint defined by two roof sections and overlying a joint between
the roof sections and a parapet;
FIG. 2 is an enlarged cross-sectional view of the embodiment of the
roof joint cover adapted for covering the joint defined by two
spaced, proximal roof sections, and taken along line 2--2 of FIG.
1; and
FIG. 3 is an enlarged cross-sectional view of a second embodiment
of the roof joint cover designed for closing the joint between a
parapet and adjacent roof sections, and taken along line 3--3 of
FIG. 1.
One embodiment of the roof joint cover assembly which utilizes the
principles of my invention is designated in FIGS. 1 and 3 by the
numeral 10 and is used to cover a joint 12 defined between a
horizontal roof section 14 and a vertical section 16 such as a
parapet wall.
The roof section 14 is conventionally provided with a wooden
stringer 18 having an outwardly and downwardly sloping outboard
surface 20, and the upper, horizontal surface 22 extending from
joint 12 toward the corresponding surface 20. A layer of roofing
material 24 is normally provided on roof section 14 and is laid
down on the roof so that one margin thereof extends upwardly along
surface 20 in contact therewith, presenting an edge 26 adjacent the
horizontal surface 22.
Assembly 10 includes an elongated and generally inverted T-shaped
support member or component 28 having a base portion 30 mounted
atop the horizontal surface 22 of stringer 18 along the length of
joint 12 and secured to the stringer by a plurality of screws 32
spaced along the length of base portion 30. Component 28 also
includes an upwardly extending segment 34 having a channel-shaped
terminal end 36 which removably receives an elongated, deformable
sealing strip 38 therein.
An elongated flexible sealing element 40, disposed along the length
of joint 12, is sandwiched between base portion 30 of support 28
and the horizontal surface 22 of stringer 18 with a portion 42
thereof extending across joint 12 and engaging surface 44 of
parapet wall 16 to effect a secondary weatherproof seal
therewith.
A flashing section 46 is provided on the outermost extremity of
base portion 30 of component 28 remote from joint 12 and adapted to
be bent down into sealing engagement with the roofing material and
firmly held thereagainst by a plurality of spaced screws 32 driven
into stringer 18. As is most apparent from FIG. 3 upon installation
of the cover assembly 10, flashing section 46 extends generally
downwardly toward roof section 14 and away from joint 12 over the
edge 26 of roofing material 24 and along the latter in spaced,
overlying relationship therewith, and terminates in a sealing rib
48. Rib 48 assures that an effective weatherproof seal is provided
between roofing material 24 and flashing member 46 when rib 48 is
positioned in tight engagement with roofing material 24.
Assembly 10 also includes a second elongated support member or
component 50 of generally L-shaped configuration mounted on the
inner surface 44 of parapet wall 16 facing toward joint 12 and
secured to wall 16 along the length thereof by a plurality of
screws 56. A pair of elongated sealing strips 58, similar to the
sealing strips 38, are sandwiched between component 50 and parapet
wall 16 on both sides of screws 56 with strips 58 providing an
effective weatherproof seal between parapet wall 16 and component
50. Component 50 is mounted on parapet wall 16 in a position
generally above the plane of the surface 22 with the foot portion
or bracket 60 of component 50 being adjacent the plane of the
surface 22 and extending outwardly from component 50 toward joint
12 in substantial alignment with terminal end 36 of segment 34 of
component 28. Component 50 is provided with a generally inverted
L-shaped projection 62 having a horizontal portion 64 extending
generally outwardly from component 50 toward joint 12 and a
vertical portion 66 extending downwardly from the extremity of
portion 64 remote from joint 12 toward bracket 60, thereby defining
a channel 68 between projection 62 and support component 50.
A generally Z-shaped cover 70 having a central portion 72 and a
pair of skirts 74 and 76 on opposite extremities of central portion
72 thereof spans joint 12 and is disposed in overlying relationship
to component 28 with the lower surface 78 of a part of the central
portion 72 adjacent skirt 74 engaging sealing strip 38 atop
terminal end 36 and supported thereby. Skirt 74 of the cover 70
remote from joint 12 extends generally downwardly toward roof
section 14 into overlying relationship with a portion of the
segment 34 of support component 28. The other skirt 76 adjacent
joint 12 extends generally upwardly into the channel 68 between
projection 62 and component 50 with a cross-sectional bead-shaped
terminal end 80 of skirt 76 being complementally received within an
elongated, transversely circular slot 82 in the horizontal portion
64 of projection 62. Skirt 76 is secured to projection 62 and the
other portion of the cover 70 adjacent skirt 76 is supported by
virtue of the fact that the distance across the opening of slot 82
is smaller than the cross-sectional diameter of the bead-shaped
terminal end 80. As may be appreciated from FIG. 3, the
configuration of slot 82 and terminal end 80 of skirt 76 allows the
latter to swing relative to projection 62 and support 50 while
securely holding skirt 76 in its upwardly extending position within
channel 68.
A series of connectors 84 are provided for securely attaching cover
70 to the foot portion or bracket 60 of component 50 and to
yieldably bias cover 70 downwardly toward bracket 60. Each
connector 84 comprises a bolt 86 having a head 88 on one extremity
thereof and a T-nut 90 having a flange 92 on one extremity thereof.
The bolts 86 project downwardly through respective openings
therefor in cover plate 70 with the heads 88 thereof engaging the
top surface of plate 70 and the terminal ends of the same located
above joint 12 but in proximal relationship thereto. Each bolt 86
extends through an opening 94 therefor in bracket 60 of component
50 with a respective T-nut 90 being threaded or otherwise affixed
to the lower end of the bolt. A portion of each nut 90 extends
through opening 94 with flange 92 thereof positioned beneath the
bracket 60. The diameter of opening 94 is greater than the diameter
of the nut 90 thereby allowing the latter to rock back-and-forth
and from side-to-side within opening 94 and connector assembly 84
to swing relative to bracket 60. An E-retainer on the upper end of
each T-nut 90 and of greater effective diameter than the opening 94
therebelow maintains the nut in position on bracket 60 during
installation so that each bolt 86 may readily be threaded into a
corresponding nut notwithstanding the fact that the latter is
hidden from view after the cover plate is positioned over the
joint.
Biasing of the cover 70 downwardly toward bracket 60 is achieved by
the provision of a coil spring 96 mounted over each nut 90 with one
end of spring 96 engaging a corresponding flange 92 and the
opposite end thereof contacting the bottom surface 98 of bracket
60, thereby causing nut 90 as well as cover 70 to be biased
downwardly toward joint 12. The biasing force of springs 96 serves
to force cover 70 into a tight sealing engagement with the sealing
strip 38 of component 28 and to force the outer surface of the
bead-shaped terminal end 80 into a tight sealing engagement with
the surfaces of the bead-shaped slot 82 adjacent the outer opening
of slot 82.
Upon shifting of the roof section 14 upwardly relative to parapet
wall 16, the bead-shaped configuration of terminal end 80 and slot
82, as well as the space between nut 90 and the edges of opening
94, allow cover 70 to swing and slightly rotate clockwise about the
pivot point corresponding to the bead-shaped terminal end 80 with
connector assembly 84 rocking generally in a clockwise manner
within opening 94. As may be appreciated, the upward shifting of
roof section 14 as well as any other relative shifting of the roof
sections does not prevent spring 96 from forcing cover 70 into a
tight sealing engagement with the sealing strip 38 and the
bead-shaped portion of terminal end 80 of cover 70 into tight
sealing engagement with the surfaces of slot 82. It may also be
appreciated that cover assembly 10 provides a more efficient
clamping force and sealing action on support 28 as well as allowing
a greater degree of relative upward and downward shifting of the
two roof sections 14 and 16 than that which is obtainable from
using a flexible cover which depends upon the natural flection of
the cover to provide the necessary clamping force.
In use, components 28 and 50 and cover 70, due to their uniform
cross-sectional configuration, may be extruded from aluminum or any
other material which offers the desired degree of strength and
production economy and cut to a variety of different standard
lengths. Components 28 and 50 are mounted along the length of joint
12 on their respective roof sections with component 28 being
mounted over the sealing material 40.
Sealing rib 48 of flashing member 46 is shifted into tight
engagement with the roofing material 24 by hammering or the like,
and a splice cover 100 is positioned over abutting ends of adjacent
components 28 and 50, secured thereto by a plurality of screws (not
shown), at each point of juncture between one component and the
next succeeding component along the length of joint 12 in order to
cover the breaks between the succeeding components 28 and 50 and to
properly seal joint 12 along its entire length. A plurality of
covers 70 are inserted into channel 68 of their respective
components 50 with skirts 76 being inserted into slots 82 and the
central portion 72 being positioned over and engaging support 28. A
splice cover 102 is also positioned over each point of juncture
between abutting ends of and is secured to the covers 70 by a
plurality of connectors 78 provided at spaced intervals along the
length of the covers 70.
The second embodiment of the roof joint cover assembly illustrated
in FIGS. 1 and 2 of the drawing is generally designated by the
numeral 110 and specifically adapted for use in covering a joint
112 defined between two horizontally spaced roof sections 114 and
116. Roof section 114 and 116 are provided with wooden stringers
118 and 119 respectively each having an outwardly and downwardly
sloping outboard surface 120, and an upper, horizontal surface 122
extending from joint 112 toward the corresponding surface 120. A
layer of roofing material 124 lies on each roofing section 114 and
116 and extends upwardly along surface 120 in contact therewith,
presenting an edge 126 adjacent the horizontal surfaces 122.
Assembly 110 includes elongated and generally inverted T-shaped
support members or components 128 and 150 with each component 128
being mounted on stringer 118 along joint 112 and component 150
being mounted on stringer 119 along joint 112. Components 128 and
150 are both provided with base portions 130 and flashing members
146 which are similar in every major respect to those for the
support component 28 of the first embodiment of the invention
described above and thus need not be further described here. In the
same manner, screws 132 are employed to secure components 128 and
150 to respective stringers.
A flexible, elongated sealing element 140 spans the distance across
joint 112 and is sandwiched at opposite sides thereof between the
base portions 130 and their respective stringers 118 and 119. The
sealing element 140 preferably formed of extruded vinyl material
similar to elements 40, also provides a secondary weatherproof seal
for joint 112.
Components 128 and 150 are each provided with an upstanding segment
134 having a channel-shaped terminal end 136 and a sealing strip
138 therein similar to that of the support component 28 previously
described in detail. Component 150, however, is provided with a
bracket 160 extending outwardly therefrom at a position adjacent
the terminal end 136 of the latter toward support component 128 and
in substantial alignment with the terminal end 136 of segment 134
of component 128.
A generally channel-shaped cover 170 having a central portion 172
and a pair of skirts 174 and 176 spans the distance across joint
112 and is disposed in overlying relationship to components 128 and
150 with the lower surface 178 of cover 170 engaging respective
sealing strips 138. Skirt 174 of cover 170 adjacent stringer 118
extends generally downwardly toward roof section 114 in overlying
relationship with a portion of segment 134 of component 128 while
the opposite skirt 176 extends generally downwardly toward roof
section 116 in overlying relationship with a portion of segment 134
of component 150. A rib 171 extends longitudinally of cover 70 and
projects downwardly therefrom adjacent the free extremity of
bracket 160 for strengthening cover 70.
A series of connector assemblies 184 similar to assemblies 84 of
the first described embodiment also each include a bolt 186 having
a head 188, a nut 190 having a flange 192, and a coil spring 196
surrounding a respective nut between flange 192 and bracket 160 to
securely attach cover 170 to bracket 160 of component 150 and
thereby firmly bias cover 70 downwardly against respective sealing
members 138 of components 128 and 150 in such a manner as to
compress the latter and effect a weatherproof seal therebetween.
Each bolt 186 extends downwardly toward joint 112 from a position
on cover 170 disposed generally centrally of the latter, over joint
112, and within the vertical extensions of the boundaries of joint
112. The bolts 186 extend downwardly through cover 170 and a
respective opening 194 within bracket 160 of component 150. Each
nut 190 is threaded onto the lower end of a corresponding bolt 186
with a portion of each nut extending through opening 194 while the
remainder thereof projects downwardly toward joint 112 in
disposition such that flange 192 thereon is positioned beneath
bracket 160. The diameter of each opening 194 is greater than the
diameter of a respective nut 190, thereby allowing each of the same
to rock back-and-forth and from side-to-side within a respective
opening 194 and the connector assembly 184 to swing relative to
bracket 160.
As may be appreciated, the provision of a connector assembly 184
mounted centrally on cover 170 enables the latter to provide an
effective seal between cover 170 and supports 128 and 150 by
allowing a balanced pivotal action about the point where each bolt
186 is circumscribed by an opening 194 within bracket 160. In this
regard, it may be seen that if roof section 116 shifts upwardly
with respect to roof section 114, the extremity 195 of cover 170
overlying roof section 116 shifts upwardly with respect to
connector assembly 184 a distance equal to that which connector
assembly 184 is shifted upwardly with respect to the extremity 197
of cover 170 overlying roof section 114. This pivotal action
provides a balanced clamping force and sealing action on the
respective supports 128 and 150 as well as allowing a greater
degree of relative upward and downward shifting of the two roof
sections 114 and 116 than that which would be obtained by using a
flexible cover which depends upon the natural flection of the cover
to provide the necessary clamping force.
Components 128 and 150 and cover 170 are similar to that of
components 28, 50 and cover 70 previously described and may be
constructed by the same material and by the same procedures.
Components 128 and 150 and cover 170 are provided with splice
covers 200 and 204 respectively, similar to covers 100 and 102 of
the first described embodiment and are mounted on their respective
stringers 118 and 119 by the same procedure as used to mount their
respective counterparts with the exception that the central portion
172 of cover 170 is mounted over and engages both supports 128 and
150.
A particularly important feature of both embodiments of the
invention is the use of coil springs for biasing the cover plates
toward respective support members and disposed in essentially
central locations transversely of respective cover plates to assure
firm sealing engagement thereof with the sealing elements on the
cover plate supports regardless of the degree or direction of
movement of the roof sections. After the coil springs are placed in
compression by tightening of bolts 86 and 186, firm, uniform
pressure is exerted on the respective cover plates throughout their
lengths. In addition, although the normal spacing between
connectors 84 or 184 is about 18 inches, it can be appreciated that
such space can readily be varied at will to accommodate a
particular structural condition.
* * * * *