U.S. patent application number 13/567209 was filed with the patent office on 2012-11-22 for restrictor plate with securing system.
This patent application is currently assigned to CAMPBELL-ERS L.L.C.. Invention is credited to Clifford F. Lill.
Application Number | 20120294676 13/567209 |
Document ID | / |
Family ID | 43924250 |
Filed Date | 2012-11-22 |
United States Patent
Application |
20120294676 |
Kind Code |
A1 |
Lill; Clifford F. |
November 22, 2012 |
RESTRICTOR PLATE WITH SECURING SYSTEM
Abstract
A restrictor plate assembly is disclosed. The assembly is
adapted for being positioned within a catch basin throat so that
the throat extends rearward of the assembly. The assembly has a
longitudinally extending restrictor plate and a restrictor plate
securing system, which includes a first clamp arm, pivotally
positioned against the restrictor plate, for engaging a first
throat surface of the catch basin; a second clamp arm pivotally
positioned against the restrictor plate, for engaging a second
throat surface of the catch basin, the second throat surface
opposing the first throat surface; and an urging member which
simultaneously urges the first and second clamp arms against the
first and second throat surfaces, respectively.
Inventors: |
Lill; Clifford F.;
(Hawthorne, NJ) |
Assignee: |
CAMPBELL-ERS L.L.C.
Harrison
NJ
|
Family ID: |
43924250 |
Appl. No.: |
13/567209 |
Filed: |
August 6, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13194141 |
Jul 29, 2011 |
8235624 |
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13567209 |
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12610622 |
Nov 2, 2009 |
7993072 |
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13194141 |
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Current U.S.
Class: |
404/4 |
Current CPC
Class: |
E03F 5/046 20130101;
E03F 5/0404 20130101 |
Class at
Publication: |
404/4 |
International
Class: |
E01C 11/22 20060101
E01C011/22 |
Claims
1. A restrictor plate assembly, adapted for being positioned within
a catch basin throat such that the throat extends rearward from
said assembly, said assembly comprising: a longitudinally extending
restrictor plate; a restrictor plate securing system, comprising:
(a) a first clamp arm, pivotally positioned against said restrictor
plate, for engaging a first throat surface of said catch basin; (b)
a second clamp arm, pivotally positioned against said restrictor
plate, for engaging a second throat surface of said catch basin,
said second throat surface opposing said first throat surface; and
(c) an urging member which simultaneously urges said first and
second clamp arms against said first and second throat surfaces,
respectively.
2. The assembly of claim 1, wherein: said clamp arms contain
pitched segments which, when said clamp arms are installed in said
restrictor plate, pitch away from each other.
3. The assembly of claim 2, wherein said clamp arms contain a
fulcrum and said pitched segments which, when said clamp arms are
installed in said restrictor plate, are rearward of said
fulcrum.
4. The assembly of claim 3, wherein: said urging member is a wedge,
defined by at least one wedge member having opposing pitched
surfaces; and said wedge is capable of being pulled toward said
restrictor plate, whereby said clamps engage said basin throat.
5. The assembly of claim 4, wherein said pitched segments define
approximately a half a length of said clamp arms.
6. The assembly of claim 4, wherein said pitched segments include a
serrated edge for gripping the basin throat upon installation of
said restrictor plate in said basin throat.
7. The assembly of claim 4, wherein said wedge includes plural
wedge members spaced by an intermediate member, wherein said
intermediate member is capable of being pulled toward said
restrictor plate.
8. The assembly of claim 7, wherein said plural wedge members are
parallel to each other and have substantially the same shape.
9. The assembly of claim 8, wherein plural wedge members are spaced
by a distance which corresponds to a width of said clamp arms.
10. The assembly of claim 9, including a bolt for pulling said
intermediate member against said restrictor plate.
11. The assembly of claim 10, wherein said clamp arms include
alignment tabs and said restrictor plate includes tab openings for
receiving said tabs.
12. The assembly of claim 11, wherein said clamp arms include
secondary tabs which are adapted for positioning said clamps
against said restrictor plate when said wedge is not installed.
13. The assembly of claim 12, wherein said alignment tabs are
compound tabs which include said secondary tabs extending
therefrom.
14. The assembly of claim 13, wherein said clamp arms include side
edge tabs, and biasing members connecting said opposing clamp arms
via said side edge tabs, whereby said clamp arms are biased towards
each other.
15. The assembly of claim 14, wherein said biasing members are
springs.
16. The assembly of claim 4, wherein a height of said restrictor
plate is less than a height of the throat, and said restrictor
plate securing system height-wise centers said restrictor plate in
said throat.
17. The assembly of claim 4, wherein said restrictor plate includes
at least one drain opening for limiting a size of floatables
passing therethrough.
18. The assembly of claim 4, including a stiffening flange
extending along a first or second lengthwise edge of said
restrictor plate.
19. The assembly of claim 18, wherein said basin throat pitches in
a first direction and said flange has a corresponding pitch
relative to said restrictor plate.
20. The assembly of claim 19, wherein said basin throat tapers
widthwise and said flange has a corresponding taper on opposing
flange corners.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This patent application is a continuation of and claims the
benefit of priority under 35 U.S.C. .sctn.120 to U.S. patent
application Ser. No. 13/194,141 filed Jul. 29, 2011, and issued as
U.S. Pat. No. 8,235,624 on Aug. 7, 2012, which in turn claims the
benefit of priority under 35 U.S.C. .sctn.120 to U.S. patent
application Ser. No. 12/610,622 filed Nov. 2, 2009, and issued as
U.S. Pat. No. 7,993,072 on Aug. 9, 2011. Each of the foregoing
patent applications and patents is incorporated by reference herein
in its entirety for any purpose whatsoever.
BACKGROUND OF THE DISCLOSURE
[0002] 1. Field of the Disclosure
[0003] The invention relates to a system for positioning a
restrictor plate within a catch basin throat.
[0004] 2. Background of the Related Art
[0005] Private groups and government bodies, such as the United
States Environmental Protection Agency (U.S.E.P.A.), have sought to
control unregulated sources of storm water discharge that have the
greatest likelihood of causing continued environmental degradation.
Such sources include storm water runoff, which picks up and
transports harmful pollutants and discharges them, untreated, to
waterways via sewer systems. Sediment-laden, contaminated runoff
can overwhelm local water bodies, particularly small streams,
resulting in streambed scour, stream bank erosion, and destruction
of near-stream vegetative cover. The further result is the loss of
in-stream habitats for fish and other aquatic species, an increased
difficulty in filtering drinking water, the loss of drinking water
reservoir storage capacity, and negative impacts on the
navigational capacity of waterways.
[0006] Introduced regulations limit the size of runoff access
points in storm drains to a maximum of seven square inches.
Openings defining such access points must be not more than two
inches across the smallest dimension. For example, a rectangular
opening of two inches by three and a half inches would conform to
such regulations. Such regulations have left state and local
governments, who have curbside storm water catch basins with large
inlets, searching for a solution.
[0007] Accordingly, there is a need to provide a novel structure
for enabling drain water and allowable sized sediment to enter the
sewer system while preventing the access to larger sediment.
SUMMARY OF THE EMBODIMENTS
[0008] A restrictor plate assembly is disclosed. The assembly is
adapted for being positioned within a catch basin throat so that
the throat extends rearward of the assembly. The assembly has a
longitudinally extending restrictor plate and a restrictor plate
securing system, which includes a first clamp arm, pivotally
positioned against the restrictor plate, for engaging a first
throat surface of the catch basin; a second clamp arm pivotally
positioned against the restrictor plate, for engaging a second
throat surface of the catch basin, the second throat surface
opposing the first throat surface; and an urging member which
simultaneously urges the first and second clamp arms against the
first and second throat surfaces, respectively.
BRIEF DESCRIPTION OF THE FIGURES
[0009] It is to be understood that the following drawings depict
details of only typical embodiments of the invention and are not
therefore to be considered to be limiting of its scope, and in
particular:
[0010] FIG. 1 illustrates a catch basin fitted with a restrictor
plate according to an embodiment of the invention;
[0011] FIG. 2 illustrates details of a restrictor plate provided in
FIG. 1;
[0012] FIG. 3 illustrates details of a second restrictor plate
provided in FIG. 1;
[0013] FIG. 4 illustrates details of a splice plate provided in
FIG. 1;
[0014] FIG. 5 illustrates an alternative embodiment, utilizing
three restrictor plates;
[0015] FIG. 6 illustrates details of a clamp arm provided in FIG.
2; and
[0016] FIG. 7 illustrates details of a wedge provided in FIG.
2.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] The Catch Basin
[0018] FIG. 1 is a prospective/front view of a restrictor plate 10,
according to an embodiment of the invention, fitted within a Type
Five (5) Catch Basin, utilized by the Department of Transportation
for the state of Florida, U.S.A. This catch basin 11 is provided
herein for illustration purposes only. The catch basin 11 includes
a rectangular inlet 12, in which the restrictor plate 10 is
positioned. Further details of the catch basin it will be disclosed
for providing context for the shape and function of the restrictor
plate 10.
[0019] The catch basin 11, is formed from reinforced concrete and
has a rectangular inlet 12. As illustrated, the width is
substantially greater than the height. Specifically, the height is
about five inches while the width is almost eleven feet.
[0020] With further reference to FIG. 1, the height of the inlet 12
is defined by opposing top and bottom edges 14, 16 and the width is
defined by opposing side edges 18, 20. The top and side inlet edges
are chamfered in the location where the edges lead into the basin
throat 22.
[0021] Top and bottom throat surfaces 24, 26 extend rearward from
top and bottom inlet edges 14, 16, and both pitch downwardly
towards the rear 28 of the throat 22. Similarly, opposing side
throat surfaces 32, 34 extend reward from opposing side inlet edges
18, 20 and taper inwardly towards the rear of the throat 28.
[0022] In the area of the drain 30, the catch basin includes a
grate 36. As illustrated, the grate 36 is on one side 38 of the
catch basin 11. The grate 36 allows sediment to drop into a basin
cavity 40, and pass into the drain 30. Furthermore, the grate 36 is
flush with the surface of the basin 11.
[0023] The grate has opposing side edges 42, 44 defining a width of
the grate 36. The side edges are spaced about five feet from each
other. In the illustrated basin 11, this spacing is less than a
half of the width of the inlet 12.
[0024] On the other hand, the grate 36 has a depth defined by
opposing front and rear grate edges 46, 48. The grate front edge 46
is forward of the inlet 12. On the other hand, the grate rear edge
48 is rearward of the inlet 12. In the illustrated basin 11, the
grate rear edge 48 is about a half a foot rear of the basin inlet
12.
[0025] The Restrictor Plate
[0026] Turning to FIG. 2 the restrictor plate 10 is illustrated.
The restrictor plate 10 is adapted for being retrofitted into the
basin throat 22, flush with or rear of the inlet 12. The restrictor
plate 10 can be manufactured from an appropriately rigid and
durable material. One example is strength/low alloy, quarter-inch
thick, Cor-Ten brand weathering steel, which is an ASTM A588 grade
steel rated to 60,000 psi.
[0027] As indicated, the restrictor plate 10 can be positioned
reward of the inlet 12 by a distance which allows clear access to
the grate 36. For example, the grate rear edge 48 is rearward by
about a half of one foot from the inlet 12. Accordingly, the
restrictor plate 10 is similarly located to allow access to and
removal of the grate 36 after the restrictor plate 10 is
installed.
[0028] The illustrated restrictor plate 10 substantially as wide as
the basin grate 36, which is less than a half of the width of the
illustrated basin inlet 12. The height of the restrictor plate 10
is slightly less than the height of the basin inlet 12. For
example, in the illustration, the restrictor plate 10 has a height
of about four and a half inches, which is about one half of an inch
less than the height of the inlet 12.
[0029] The height difference between the restrictor plate 10 and
the inlet 12 enables floating the restrictor plate 10 above the
bottom surface of the catch basin upon installation. Floating
enables the restrictor plate 10 to fit within the basin throat 22,
despite random surface contour variations. It also allows small
particles to pass under the restrictor plate 10 and into the drain
30, which is acceptable by regulations.
[0030] The restrictor plate 10 includes a main body 52, which has a
bottom edge 54. Attached to the bottom edge 54 is a stiffening
flange 56. The flange 56 is pitched downwardly to match the pitch
of the basin throat 22. This pitch provide an effective guide for
proper insertion of the restrictor plate 10 into the basin throat
22. The flange 52, as illustrated, is about three inches deep.
However, other depths which provide the proper stiffness are
acceptable.
[0031] Regarding the guide function, if a job-site worker
accidentally inverts the restrictor plate 10, (e.g., flips the
plate 10 about its center, depth-wise axis), the flange pitch will
extend in the wrong direction. This would prevent the restrictor
plate 10 from being installed in the basin throat 22. The job-site
worker would be required to flip the restrictor plate 10 to the
proper orientation to complete instillation.
[0032] The flange 56 has opposing side edges 58, 60 which are cut
or formed with a surface contour. This contour matches the inward
pitch angle of the side surfaces 32, 34 of the basin throat 12.
This also enables a proper placement of the restrictor plate 10
within the basin throat 12.
[0033] Along an upper edge 62 of the restrictor plate 10 are plural
flanges 64, 66, which have the same depth as the bottom flange 56.
The upper flanges 64, 66 are also parallel with the bottom flange
56. The upper flanges 64, 66 are illustrated as being substantially
less than the length of the restrictor plate 10. The flanges 64, 66
provide additional stiffness in the area at which the securing
system (discussed below) interacts with the restrictor plate 10. As
illustrated, the upper flanges 64, 66 are asymmetrical about their
depth-wise centerline and the width of the flanges 64, 66 is
approximately five inches.
[0034] Alternatively, if the restrictor plate 10 were longer than
that illustrated in FIG. 2, additional securing system (discussed
below) could be used for securing the restrictor plate 10 to the
basin throat 22. Such a longer restrictor plate 67 is illustrated
in FIG. 3, and is provided with flanges 68, 70 which are offset
from the center of the restrictor plate 67. The flanges 68, 70 are
symmetrical about their depth-wise center and are approximately six
inches wide. The actual dimensions of each of the upper flanges
64-70 can be modified so long as structural integrity of the
restrictor plates 10, 67 are maintained.
[0035] Furthermore, the asymmetric upper flanges 64, 68 have side
edges 72, 74, which have the same edge contours as the outer edges
58, 68 of the bottom flange 56. The contours serve the same purpose
as with the bottom flange, to guide the restrictor plate 10 when
being set in a with-wise tapered basin throat 22.
[0036] The restrictor plate 10 has plural drainage openings, e.g.,
76, disposed along its length, which allow for continued drainage
while restricting larger floatables. Based on design requirements,
the size and shape of the openings is less than seven square inches
and has a clear space no greater than two inches across the
smallest dimension. It is to be noted that the design requirements
for the opening size are identified for illustration purposes only
and not to limit the scope of the invention.
[0037] According to FIG. 2, there are nine openings 76. While eight
of the openings are identical, the center opening 78 sized
differently and is designed to display a stainless steel badge 80
(FIG. 1), which has been stitch-welded to a rear face 81 of the
main body 52 of the restrictor plate 10. The badge 80 can be used
to provide information, such as from a government or private entity
which installed, or cause to be installed, the restrictor plate 10.
For example, the message could be from the U.S.E.P.A. It is to be
noted that other shapes, sizes and locations for the badge can be
implemented.
[0038] As illustrated in FIG. 1, a second restrictor plate 82 is
positioned on the right side of the other (first) restrictor plate
10. Depending on the width of the inlet 12 on the right side of the
basin grate 36, the second restrictor plate 82 may be shorter,
longer or the same length as the first restrictor plate 10. As
indicated above, an example of a longer restrictor plate 82 is
restrictor plate 67, illustrated in FIG. 3.
[0039] It should be appreciated from the above discussion that the
shape of the restrictor plates are symmetrically designed. This
symmetry provides advantages, discussed below.
[0040] The second restrictor plate 82 is positioned forward of the
first restrictor plate 10, and is substantially flush with the
inlet 12. This is because the second restrictor plate 82 does not
extend over the grate 36.
[0041] The Splice Plate
[0042] The aggregate length of the first and second restrictor
plates 10, 82 are intentionally less than the width of the inlet
12. This enables the two restrictor plates 10, 82 to be connected
by a splice plate 84, providing end-to-end restricted coverage of
the inlet 12.
[0043] The splice plate 84 is formed from the same material as the
restrictor plate 10. As illustrated in FIG. 4, the splice plate 84
has the same height as the restrictor plate 10. The splice 84 plate
is formed with compound (i.e., two) offset angles 86, 88, such as a
shifted slide.
[0044] As illustrated in FIG. 4, based on the first offset angle
86, one side 90 of the splice plate 84 is lower than the other side
92. Based on the second offset angle 88, one side 90 of the splice
plate terminates rearward of the other side 92. This compound
offset matches the downward pitch of the throat 22 occupied between
adjacent restrictor plates 10, 82. As a result, the two restrictor
plates 10, 82 engage in a linear connection, across the inlet
12.
[0045] The splice plate 86 is formed with opposing end tabs 94, 96.
The tabs are parallel with each other and at an angle 99 to a main
body portion 98 of the splice plate 86. This relationship enables
the tabs 94, 96 to be plumb against the main body portions (e.g.,
52) of adjacent restrictor plates 10, 82.
[0046] The splice plate tabs 94, 96, and connecting ends of at
least one of the restrictor plates 10, 82 have plural mounting
holes 98, 100. More than one hole in each member is desirable, and
two holes are illustrated, to prevent rotation of the splice plate
84 relative to the restrictor plate 82. The type of bolts which can
be used to match the splice plates to the restrictor plates
include, e.g., 1/2-13 button head cap screw made of 10-18 steel
which conforms with ASTM F835 standards. However, other such
mounting bolts may be applied.
[0047] The splice plate 86 includes plural drain holes, e.g., 102,
which are the same shape as the holes 76 in the restrictor plates
10, 82. The drain holes 102 are stepped in the direction of the
first angle 86 of the compound offset of the splice plate 84.
Stepping the drain holes in this fashion positions the holes in
parallel with the holes 76 in the restrictor plate.
[0048] Turning to FIG. 5, another configuration is illustrated. In
this configuration, the grate plate (not illustrated) is positioned
in the center of a catch basin (not illustrated). In this
embodiment, a third restrictor plate 104 can be utilized, along
with a second splice plate 106. In this configuration, the outer
restrictor plates are flush with the basin inlet. The center
restrictor plate is recessed, down the throat of the basin, to
allow for grate access.
[0049] As illustrated in FIG. 5, the outer restrictor plates are
longer than the center restrictor plate. This is suitable for a
catch basin in which the center grate is smaller than one/third the
width of the basin inlet.
[0050] The symmetric shape of each discussed restrictor plate
allows the plate to be laterally shifted in the inlet opening. As
such, in FIG. 5, the same restrictor plate formation can be used
for each outer restrictor plate. The same restrictor plate
formation could also serve as the outer plates and the center
plate, if conditions warranted such a configuration.
[0051] The same formation for the splice plate can provide both
splice plates 84, 106. A splice plate needs only be flipped about
its axis to suit its purpose.
[0052] The Clamp Arm of the Securing System
[0053] Attention will now be directed to structure for securing the
restrictor plate within the throat of the catch basin, which is
illustrated in FIGS. 2, 6 and 7. There are at least two such
structures 108, 110, one at each opposing end of the restrictor
plate 10. With reference to FIG. 3, more such structures, e.g., a
total of four structures, can be added depending on the length of
the restrictor plate.
[0054] The components of each of the securing systems 108 are
identical. Each includes plural clamp arms 112, 114. That is, a
lower clamp arm and an upper clamp arm.
[0055] A front edge 116 of the lower clamp 112 arm extends
outwardly from a rear face 81 of the main body 52 of the restrictor
plate 10. A fulcrum 118 is located at about the lengthwise midpoint
of the clamp arm 112, at which point the arm pitches downwardly, at
an angle 119, which is illustrated as being about sixty degrees.
The angle 119 enables the clamp arm 112 to grip into the concrete
surface of the basin throat 22, but other angles may be
substituted.
[0056] Rearward of the fulcrum 118, the clamp extends through an
opening 120 in the bottom flange 56. The opening 120 is required
due to the depth of the flanges and the size of the clamp arms. The
opening 120 in the flange is illustrated as being just over two
inches long (i.e., parallel to the length axis for the flange 56)
and just over an inch in depth. Furthermore, the opening 120 is
spaced by about a quarter of an inch from the depth-wise edge of
the flange. However, these dimensions are only exemplarily and can
be modified according to the design and placement of the clamp
arms.
[0057] The upper clamp 114 arm also extends from the rear face 81
of the main body 52 of the restrictor plate 10. The upper clamp 114
extends through an opening 121, sized similarly to the other
referenced opening 120, in a respective upper flange 64.
[0058] Each clamp arm includes a serrated end section 122. The
serrated sections are adapted to dig into the concrete basin throat
22, securing the restrictor plate 10 to the basin. The serrated
sections 122 are illustrated as being triangular, saw toothed
serrations 124, spanning the distance of the clamp edge. Further,
as illustrated, each tooth is about a quarter of an inch tall and
about a third of an inch wide. However, other serration
configurations may be equally applicable.
[0059] In an unbent state, e.g., during the fabrication process,
the clamp is illustrated as having a length of about four inches.
The clamp is also illustrated as having a width of about two
inches. However, these dimensions are not viewed as limiting the
invention.
[0060] Each clamp has a compound tab 126 disposed at the front
clamp edge 116. A rearward part 128 of the tab 126 extends from the
center of the front clamp edge 116. The rearward part 128 of the
tab 126 projects outwardly from the front clamp edge 116 by the
thickness of the restrictor plate 10. The tab 126 is designed to
fit within a complementary positioning slot 132 in the restrictor
plate 10.
[0061] Extending from the rearward portion of the tab 126 is a
half-moon shaped secondary tab 134. The secondary tab 134 is
connected to the rearward portion 128 of the 126 tab by a narrow
connecting extension 136.
[0062] With the compound tab 126 and matching slot 132, the clamp
112 can be held in a proper configuration against the restrictor
plate 10 before instillation is complete. This is done by inserting
the tab 126 into the restrictor plate 10, griping the secondary tab
134 with a wrench, and twisting about the narrow extension 136 by
just a few degrees. After instillation is complete, the secondary
tab 126 can be torn off by further twisting until the extension 136
factures.
[0063] The clamp 112 also has two side edge tabs 138, 140, with
associated extensions 139, 141. This structure is similar in shape,
though smaller, than the secondary tab 134 and connecting extension
136 in the compound tab 126. The side edge tabs 138, 140 are
connected via extensions 139, 141 directly to respective side edges
142, 144 of the clamp 112, forward of the fulcrum 118.
[0064] When the long axis of the restrictor plate is parallel with
the horizontal, the positioned clamps 112, 114 have two pair of
vertically aligned side edge tabs. Each pair is joined by a
respective stabilizing spring 142, 144, which helps prevent
misalignment of the clamps during instillation.
[0065] The Wedge of the Securing System
[0066] A wedge 146 is illustrated in FIG. 7, which has opposing
wedge surfaces 148, 150. Each of the surfaces 148, 150 is double
sided 152, 154, and each extends substantially perpendicular to an
intermediate surface 156. The pitch angle 158 for each side 152,
154 of the wedge 146 is about forty degrees, but other suitable
angles could be utilized. The wedge is fabricated from the same
material as the restrictor plate 10.
[0067] In use, the intermediate wedge surface 156 is pulled towards
the rear face 81 of the main body 52 of the restrictor plate 10. By
this operation, the opposing pitched surfaces 152, 154 of the wedge
146 press against the clamp arms at, e.g., the fulcrum. The clamp
arms are thereby advanced through respective upper and lower flange
openings and forced to dig into the concrete in the basin throat
22.
[0068] The intermediate wedge surface 156 is widthwise dimensioned
to separate the wedge surfaces 148, 150 against the clamp arm 112
by substantially the width of the clamp arm. The intermediate wedge
surface 156 is height-wise dimensioned to separate opposing,
outermost tips 159, 160 of the wedge by about three inches, but
other height-wise spacing may be substituted.
[0069] The intermediate surface is drawn to the restrictor plate,
via a through hole 162, by a mounting bolt 164. As illustrated, the
mounting bolt 164 is a 1/2-13 button head cap screw made of 10-18
steel which conforms with ASTM F835 standards. However, other such
mounting bolts may be applied. The head of the bolt 166 rests
against the front surface 168 of the main body 52 of the restrictor
plate 10. On the other side, a mounting nut 165 is positioned on a
rear surface 170 of the intermediate surface 156.
[0070] In use, the wedge is positioned against the clamp arms,
which are urged together by the springs. The mounting bolt and nut
are introduced and tightened by, e.g., 72+5-0 ft-lbs of torque.
This causes the wedge to urge the clamp arms against the concrete
basin, thereby centering the restrictor plate in the height of the
opening. This also renders the system tamperproof at the completion
of instillation. The secondary tabs can be removed, as indicated
above, as may be required or desired.
[0071] The present invention may be embodied in other specific
forms without departing from its spirit or essential
characteristics. The described embodiments are to be considered in
all respects only as illustrative and not as restrictive. The scope
of the invention is, therefore, indicated by the appended claims
and their combination in whole or in part rather than by the
foregoing description. All changes that come within the meaning and
range of equivalency of the claims are to be embraced within their
scope.
* * * * *