U.S. patent application number 11/599075 was filed with the patent office on 2008-05-15 for inspection port.
Invention is credited to David M. Thompson.
Application Number | 20080110906 11/599075 |
Document ID | / |
Family ID | 39368231 |
Filed Date | 2008-05-15 |
United States Patent
Application |
20080110906 |
Kind Code |
A1 |
Thompson; David M. |
May 15, 2008 |
Inspection port
Abstract
An inspection port is for use in connection with a panel having
a mounting hole. A base ring has a circular wall with base inner
and base outer surfaces. The base ring has a plurality of flexible
annular ridges extending transversely outward. The annular ridges
each have a diameter greater than the mounting hole diameter. A
cover has a circular wall with cover inner and outer surfaces. The
cover outer surface is adapted for sliding engagement with the base
inner surface. The cover has a plate extending transversely across
the cover. An O-ring removably seals the cover to the base ring.
The cover plate can be opaque, or transparent, and includes at
least one finger recess for rotating the plate. The cover can
include a plurality of louvers in the plate. To latch the cover,
the base ring has four key slots 90 degrees apart on the base inner
surface. The key slots are each L-shaped, with an axial leg and a
transverse leg. The cover has four pins 90 degrees apart on the
cover outer surface. When the cover is inserted into the base ring,
the four pins will engage the four key slots. Rotating the cover
removably latches the cover to the base ring. To install the
inspection port, the mounting hole is first cut in the panel with a
standard size hole saw. A sealant compound is applied to the base
ring, which is tapped into position with a mallet. The annular
ridges will bend outward as they pass into the mounting hole. The
outwardly bent ridges will prevent removal of the base ring.
Inventors: |
Thompson; David M.;
(Bricktown, NJ) |
Correspondence
Address: |
ANDREW W. LUDY
17 SHERWOOD WAY, P.O. Box 418
Mt. Arlington
NJ
07856
US
|
Family ID: |
39368231 |
Appl. No.: |
11/599075 |
Filed: |
November 14, 2006 |
Current U.S.
Class: |
220/663 |
Current CPC
Class: |
B63B 29/02 20130101;
E02D 29/1427 20130101; B63B 19/00 20130101 |
Class at
Publication: |
220/663 |
International
Class: |
B65D 25/54 20060101
B65D025/54 |
Claims
1. An inspection port for use in connection with a panel, the panel
having a mounting hole therethrough with a predetermined diameter,
the inspection port comprising: a base ring having a longitudinal
axis, the base ring having a circular wall extending between first
and second ends along the longitudinal axis, the circular wall
having base inner and base outer surfaces, the base outer surface
having a diameter less than the mounting hole predetermined
diameter, the base ring having at least one flexible annular ridge
extending transversely outward from the base outer surface, the
annular ridge having a diameter greater than the mounting hole
predetermined diameter, the annular ridge being adapted for
engagement with the mounting hole; a cover having a circular wall
extending between first and second ends, the circular wall having
cover inner and cover outer surfaces, the cover outer surface being
adapted for close sliding engagement with the base inner surface,
the cover having a plate extending transversely across the circular
wall at the second end; latching means for removably latching the
cover in close engagement with the base ring; and sealing means for
removably sealing the cover to the base ring.
2. The inspection port of claim 1, wherein the latching means
further comprises: the base ring having at least one key slot on
the base inner surface; and the cover having at least one pin on
the cover outer surface, the pin being adapted to engage the key
slot upon insertion of the cover into the base ring and rotation of
the cover, so as to removably latch the cover to the base ring.
3. The inspection port of claim 1, wherein the latching means
further comprises: the cover having at least one key slot on the
cover outer surface; and the base ring having at least one pin on
the base inner surface, the pin being adapted to engage the key
slot upon insertion of the cover into the base ring and rotation of
the cover, so as to removably latch the cover to the base ring.
4. The inspection port of claim 1, wherein the sealing means
further comprises an O-ring seal between the cover and the base
ring.
5. The inspection port of claim 4, wherein the sealing means
further comprises: the base ring having an O-ring groove adjacent
the second end; the cover plate extending transversely outward
beyond the cover outer surface to form a cover flange adapted to
cover the O-ring groove upon insertion of the cover into the base
ring; and an O-ring adapted to fit into the O-ring groove, so as to
seal the cover to the base ring.
6. The inspection port of claim 1, wherein: the cover plate is
opaque; and the cover plate includes at least one finger recess for
rotating the plate.
7. The inspection port of claim 1, wherein: the cover plate is
transparent so as to allow visual inspection through the inspection
port without opening the cover; and the cover plate includes at
least one finger recess for rotating the plate.
8. The inspection port of claim 1, wherein the cover further
comprises a plurality of louvers penetrating the plate so as to
provide ventilation through the inspection port.
9. An inspection port for use in connection with a panel, the panel
having a mounting hole therethrough with a predetermined diameter,
the inspection port comprising: a base ring having a longitudinal
axis, the base ring having a circular wall extending between first
and second ends along the longitudinal axis, the circular wall
having base inner and base outer surfaces, the base outer surface
having a diameter less than the mounting hole predetermined
diameter, the base ring having an annular flange adjacent the
second end and extending transversely outward from the base outer
surface, the base ring having a plurality of flexible annular
ridges extending transversely outward from the base outer surface,
the annular ridges each having a diameter greater than the mounting
hole predetermined diameter, the annular ridges being adapted for
engagement with the mounting hole; a cover having a longitudinal
axis, the cover having a circular wall extending between first and
second ends along the longitudinal axis, the circular wall having
cover inner and cover outer surfaces, the cover outer surface being
adapted for close sliding engagement with the base inner surface,
the cover having a plate extending transversely across the circular
wall at the second end; latching means for removably latching the
cover in close engagement with the base ring; and sealing means for
removably sealing the cover to the base ring.
10. The inspection port of claim 9, wherein the latching means
further comprises: the base ring having at least one key slot on
the base inner surface, the key slot being L-shaped with an axial
leg of the L extending in an axial direction, and a transverse leg
of the L extending in a transverse direction; and the cover having
at least one pin on the cover outer surface, the pin being adapted
to engage the key slot upon axial insertion of the cover into the
base ring so that the pin will pass through the axial leg, the
cover will be rotated, and the pin will enter the transverse leg,
whereby the cover cannot be removed axially, so as to removably
latch the cover to the base ring.
11. The inspection port of claim 9, wherein the latching means
further comprises: the cover having at least one key slot on the
cover outer surface, the key slot being L-shaped with an axial leg
of the L extending in an axial direction, and a transverse leg of
the L extending in a transverse direction; and the base ring having
at least one pin on the base inner surface, the pin being adapted
to engage the key slot upon axial insertion of the cover into the
base ring so that the pin will pass through the axial leg, the
cover will be rotated, and the pin will enter the transverse leg,
whereby the cover cannot be removed axially, so as to removably
latch the cover to the base ring.
12. The inspection port of claim 9, wherein the sealing means
further comprises an O-ring seal between the cover and the base
ring.
13. The inspection port of claim 9, wherein the sealing means
further comprises: the base ring having an O-ring groove adjacent
the second end; the cover plate extending transversely outward
beyond the cover outer surface to form a cover flange adapted to
cover the O-ring groove upon insertion of the cover into the base
ring; and an O-ring adapted to fit into the O-ring groove, so as to
seal the cover to the base ring.
14. The inspection port of claim 9, wherein: the cover plate is
opaque; and the cover plate includes at least one finger recess for
rotating the plate.
15. The inspection port of claim 9, wherein: the cover plate is
transparent so as to allow visual inspection through the inspection
port without opening the cover; and the cover plate includes at
least one finger recess for rotating the plate.
16. The inspection port of claim 9, wherein the cover further
comprises a plurality of louvers penetrating the plate so as to
provide ventilation through the inspection port.
17. An inspection port for use in connection with a panel, the
panel having a mounting hole therethrough with a predetermined
diameter, the inspection port comprising: a base ring having a
longitudinal axis, the base ring having a circular wall extending
between first and second ends along the longitudinal axis, the
circular wall having base inner and base outer surfaces, the base
outer surface having a diameter less than the mounting hole
predetermined diameter, the base ring having an annular flange
adjacent the second end and extending transversely outward from the
base outer surface, the base ring having an O-ring groove adjacent
the second end, the base ring having a plurality of flexible
annular ridges extending transversely outward from the base outer
surface, the annular ridges each having a diameter greater than the
mounting hole predetermined diameter, the annular ridges being
adapted for engagement with the mounting hole; a cover having a
longitudinal axis, the cover having a circular wall extending
between first and second ends along the longitudinal axis, the
circular wall having cover inner and cover outer surfaces, the
cover outer surface being adapted for close sliding engagement with
the base inner surface, the cover having a plate at the second end
extending transversely across the cover and transversely outward
beyond the cover outer surface to form a cover flange adapted to
cover the O-ring groove upon insertion of the cover into the base
ring; an O-ring adapted to fit into the O-ring groove, so as to
seal the cover to the base ring; and latching means for removably
latching the cover in close engagement with the base ring.
18. The inspection port of claim 17, wherein the latching means
further comprises: the base ring having four key slots spaced
approximately 90 degrees apart on the base inner surface, the key
slots each being L-shaped with an axial leg of the L extending in
an axial direction, and a transverse leg of the L extending in a
transverse direction; and the cover having four pins spaced
approximately 90 degrees apart on the cover outer surface, the four
pins being adapted to engage the four key slots upon axial
insertion of the cover into the base ring so that the pins will
pass through the axial legs, the cover will be rotated, and the
pins will enter the transverse legs, whereby the cover cannot be
removed axially, so as to removably latch the cover to the base
ring.
19. The inspection port of claim 17, wherein the latching means
further comprises: the cover having four key slots approximately 90
degrees apart on the cover outer surface, the key slots each being
L-shaped with an axial leg of the L extending in an axial
direction, and a transverse leg of the L extending in a transverse
direction; and the base ring having four pins approximately 90
degrees apart on the base inner surface, the four pins being
adapted to engage the four key slots upon axial insertion of the
cover into the base ring so that the pins will pass through the
axial legs, the cover will be rotated, and the pins will enter the
transverse legs, whereby the cover cannot be removed axially, so as
to removably latch the cover to the base ring.
20. The inspection port of claim 17, wherein: the cover plate is
opaque; and the cover plate includes at least one finger recess for
rotating the plate.
21. The inspection port of claim 17, wherein: the cover plate is
transparent so as to allow visual inspection through the inspection
port without opening the cover; and the cover plate includes at
least one finger recess for rotating the plate.
22. The inspection port of claim 17, wherein the cover further
comprises a plurality of louvers penetrating the plate so as to
provide ventilation through the inspection port.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] Not Applicable
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
[0002] Not Applicable
BACKGROUND OF THE INVENTION
[0003] This invention relates to the field of inspection portholes,
and more particularly to a marine inspection port having a
removable cover.
[0004] It is expedient to be able to inspect and easily access
equipment on a boat. This equipment may be hidden from view behind
a bulkhead, under a cabin sole, or inside an engine box. Valves,
pumps, gages, and the like require access, yet must be covered in a
water-resistant and attractive manner. In some cases, venting is
required. In other cases, a transparent window is desirable. A
quick and easy method of installation is also desirable.
[0005] Accordingly, there is a need to provide an inspection port
that can be opened and closed quickly and easily.
[0006] There is a further need to provide an inspection port of the
type described and that is sealed in a water-resistant or
watertight manner.
[0007] There is a yet further need to provide an inspection port of
the type described and that will provide ventilation where
desired.
[0008] There is a still further need to provide an inspection port
of the type described and that has a cover that is either opaque or
transparent as required.
[0009] There is another need to provide an inspection port of the
type described and that can be quickly and easily installed with a
minimum of tools and skill.
[0010] There is yet another need to provide an inspection port of
the type described and that can be manufactured cost-effectively in
large quantities of high quality.
BRIEF SUMMARY OF THE INVENTION
[0011] In accordance with the present invention, there is provided
an inspection port constructed in accordance with the invention,
and is for use in connection with a panel on a boat. The panel has
a mounting hole. The inspection port comprises a base ring with a
circular wall extending between first and second ends. The circular
wall has base inner and base outer surfaces. The base outer surface
has a diameter less than the mounting hole diameter. The base ring
has a flange adjacent the second end and extending transversely
outward from the base outer surface. The base ring has an O-ring
groove adjacent the second end. The base ring has a plurality of
flexible annular ridges extending transversely outward from the
base outer surface. The annular ridges each have a diameter greater
than the mounting hole diameter, and are adapted for engagement
with the mounting hole.
[0012] A cover has a circular wall extending between first and
second ends. The circular wall has a cover inner surface, and a
cover outer surface. The cover outer surface is adapted for sliding
engagement with the base inner surface. The cover has a plate at
the second end extending transversely across the cover. An O-ring
is provided to fit into the O-ring groove, and provides sealing
means for removably sealing the cover to the base ring. The cover
plate can be opaque, or transparent, and includes at least one
finger recess for rotating the plate. The cover can include a
plurality of louvers in the plate.
[0013] To removably latch the cover, the base ring has four key
slots approximately 90 degrees apart on the base inner surface. The
key slots are each L-shaped with an axial leg of the L extending in
an axial direction, and a transverse leg of the L extending in a
transverse direction. The cover has four pins approximately 90
degrees apart on the cover outer surface. When the cover is
inserted into the base ring, the four pins will engage the four key
slots. The pins will pass through the axial legs. The cover is then
rotated, and the pins will enter the transverse legs. At this
point, the cover is removably latched to the base ring. The cover
is removed by rotating the cover in the opposite direction and
pulling the cover outward.
[0014] To install the inspection port, a mounting hole is first cut
in the panel with a standard size hole saw. A sealant compound is
applied to the base ring, which is tapped into position with a
mallet. The annular ridges will bend outward as they pass into the
mounting hole. The outwardly bent ridges will prevent removal of
the base ring.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0015] A more complete understanding of the present invention may
be obtained from consideration of the following description in
conjunction with the drawing, in which:
[0016] FIG. 1 is an exploded assembly perspective view of an
inspection port constructed in accordance with the invention, and
showing a louvered cover.
[0017] FIG. 2 is a contracted assembly perspective view of the
inspection port of FIG. 1.
[0018] FIG. 3 is a contracted assembly perspective view of another
inspection port constructed in accordance with the invention, and
showing a solid cover.
[0019] FIG. 3a is a front elevational sectional view of the
assembly of FIG. 3, taken along lines 3a-3a of FIG. 3, shown at an
enlarged scale.
[0020] FIG. 4 is a perspective view of the louvered cover of the
inspection port of FIG. 1.
[0021] FIG. 5 is a top view of the louvered cover of FIG. 4.
[0022] FIG. 6 is a right side sectional elevational view of the
louvered cover of FIG. 4, taken along lines 6-6 of FIG. 5.
[0023] FIG. 7 is a front elevational view of the louvered cover of
FIG. 4.
[0024] FIG. 8 is a perspective view of the solid cover of the
inspection port of FIG. 3.
[0025] FIG. 9 is a top view of the solid cover of FIG. 8.
[0026] FIG. 10 is a right side sectional elevational view of the
solid cover of FIG. 8, taken along lines 10-10 of FIG. 9.
[0027] FIG. 11 is a front sectional elevational view of the solid
cover of FIG. 8, taken along lines 11-11 of FIG. 9.
[0028] FIG. 12 is a front elevational view of the solid cover of
FIG. 8.
[0029] FIG. 13 is a perspective view of a base ring of the
inspection port of FIG. 1.
[0030] FIG. 14 is a top view of the base ring of FIG. 13.
[0031] FIG. 15 is a right side sectional elevational view of the
base ring of FIG. 13, taken along lines 15-15 of FIG. 14.
[0032] FIG. 16 is a front elevational view of the base ring of FIG.
13.
[0033] FIG. 17 is a front elevational detail view of a key slot of
the base ring of FIG. 13, taken along lines 17-17 of FIG. 14, shown
at an enlarged scale.
[0034] FIG. 18 is a front elevational sectional view of the base
ring of FIG. 13, taken along lines 18-18 of FIG. 14, shown at an
enlarged scale.
[0035] FIG. 19 is an exploded assembly perspective view of another
inspection port constructed in accordance with the invention, and
showing a louvered cover.
[0036] FIG. 20 is a front elevational partial sectional view of the
cover of FIG. 19, taken along lines 20-20 of FIG. 19, shown at an
enlarged scale. And
[0037] FIG. 21 is a front elevational partial sectional view of the
base ring of FIG. 19, taken along lines 21-21 of FIG. 19, shown at
an enlarged scale.
DETAILED DESCRIPTION OF THE INVENTION
[0038] Referring now to the drawing, and especially to FIGS. 1-18
thereof, an inspection port constructed in accordance with the
invention is shown at 20, and is for use in connection with a panel
22, such as a bulkhead or engine box or instrument panel on a boat.
The panel 22 has a mounting hole 24 therethrough with a
predetermined diameter. The inspection port 20 comprises a base
ring 26 having a longitudinal axis 27. The base ring 26 has a
circular wall 28 extending between first 30 and second 32 ends
along the longitudinal axis 27. The circular wall 28 has base inner
34 and base outer 36 surfaces. The base outer surface 36 has a
diameter less than the mounting hole 24 predetermined diameter. The
base ring 26 has a flange 38 adjacent the second end 32 and
extending transversely outward from the base outer surface 36. The
base ring 26 has an O-ring groove 40 adjacent the second end 32.
The base ring 26 has at least one, and preferably a plurality, of
flexible annular ridges 42 extending transversely outward from the
base outer surface 36. The annular ridges 42 each have a diameter
greater than the mounting hole predetermined diameter, and are
adapted for engagement with the mounting hole 24.
[0039] To install the inspection port 20, a mounting hole 24 is
first cut in the panel 22 with a hole saw. The mounting hole
predetermined diameter is a standard hole saw size. The circular
wall base outer surface 36 fits into the mounting hole 24 with a
small clearance. The annular ridges 42 are slightly larger in
outside diameter than the mounting hole 24. A sealant compound is
applied to the base ring 26. The base ring 26 is aligned with the
mounting hole 24 and tapped into position with a mallet or hammer.
The annular ridges 42 will bend or flex outward as they pass into
the mounting hole 24. The outwardly bent ridges will prevent
removal of the base ring 26. Thus, the inspection port 20 is
quickly and easily installed in the panel 22 with simple tools by a
semi-skilled person.
[0040] A cover 44 has a longitudinal axis 45 and a circular wall 46
extending between first 48 and second 50 ends along the
longitudinal axis 45. The circular wall 46 has a cover inner
surface 52, and a cover outer surface 54. The cover outer surface
54 is adapted for close sliding engagement with the base inner
surface 34. The cover 44 has a plate 56 at the second end 50
extending transversely across the cover 44 and transversely outward
beyond the cover outer surface 54 to form a cover flange 58. The
cover flange 58 covers the O-ring groove 40 when the cover 44 is
inserted into the base ring 26. An O-ring 60 is provided to fit
into the O-ring groove 40, and provides sealing means for removably
sealing the cover 44 to the base ring 26. The cover plate 56 can be
opaque, or transparent so as to allow visual inspection through the
inspection port without opening the cover. The cover plate 56
includes at least one, and preferably two finger recesses 57 for
rotating the plate 56. As an alternative, the cover 44 can include
a plurality of louvers 62 penetrating the plate 56 so as to provide
ventilation through the inspection port 20.
[0041] Latching means is provided for removably latching the cover
44 in close engagement with the base ring 26. In particular, the
base ring 26 has at least one key slot, and preferably has four key
slots 66 approximately 90 degrees apart on the base inner surface
34. The key slots 66 are each L-shaped with an axial leg 68 of the
L extending in an axial direction, and a transverse leg 70 of the L
extending in a transverse direction. The cover 44 has at least one
pin, and preferably has four pins 74 approximately 90 degrees apart
on the cover outer surface 54. When the cover 44 is inserted into
the base ring 26 in an axial direction, the four pins 74 will
engage the four key slots 66. The pins 74 will pass through the
axial legs 68. The cover 44 is then rotated, and the pins 74 will
enter the transverse legs 70. At this point, the cover 44 cannot be
removed axially, and the cover is removably latched to the base
ring 26. To remove the cover 44, rotate the cover in the opposite
direction and pull it outward.
[0042] Turning now to FIG. 19, another inspection port constructed
in accordance with the invention is shown at 120, and is for use in
connection with a panel 122, having a mounting hole 124
therethrough with a predetermined diameter. The inspection port 120
is similar to inspection port 20 described above, in that it
comprises a base ring 126 having a longitudinal axis 127. The base
ring 126 has a circular wall 128 extending between first 130 and
second 132 ends along the longitudinal axis 127. The circular wall
128 has base inner 134 and base outer 136 surfaces. The base outer
surface 136 has a diameter less than the mounting hole 124
predetermined diameter. The base ring 126 has a flange 138 adjacent
the second end 132 and extending transversely outward from the base
outer surface 136. The base ring 126 has an O-ring groove 140
adjacent the second end 132. The base ring 126 has a plurality of
flexible annular ridges 142 extending transversely outward from the
base outer surface 136. The annular ridges 142 each have a diameter
greater than the mounting hole predetermined diameter, and are
adapted for engagement with the mounting hole 124. The inspection
port 120 is installed in the same manner as inspection port 20.
[0043] A cover 144 has a longitudinal axis 145 and a circular wall
146 extending between first 148 and second 150 ends along the
longitudinal axis 145. The circular wall 146 has a cover inner
surface 152, and a cover outer surface 154. The cover outer surface
154 is adapted for close sliding engagement with the base inner
surface 134. The cover 144 has a plate 156 at the second end 150
extending transversely across the cover 144 and transversely
outward beyond the cover outer surface 154 to form a cover flange
158. The cover flange 158 covers the O-ring groove 140 when the
cover 144 is inserted into the base ring 126. An O-ring 160 is
provided to fit into the O-ring groove 140, and provides sealing
means for removably sealing the cover 144 to the base ring 126. The
cover plate 156 can be opaque, or transparent so as to allow visual
inspection through the inspection port without opening the cover.
The cover plate 156 includes at least one finger recess (not shown)
for rotating the plate 156. As an alternative, the cover 144 can
include a plurality of louvers 162 penetrating the plate 156 so as
to provide ventilation through the inspection port 120.
[0044] The inspection port 120 differs from inspection port 20
described above, in the manner in which the latching means
removably latches the cover 144 in close engagement with the base
ring 126. In particular, the cover 144 has at least one key slot,
and preferably has four key slots 166 approximately 90 degrees
apart on the cover outer surface 154. The key slots 166 are each
L-shaped with an axial leg 168 of the L extending in an axial
direction, and a transverse leg 170 of the L extending in a
transverse direction. The base ring 126 has at least one pin, and
preferably has four pins 174 approximately 90 degrees apart on the
base inner surface 134. When the cover 144 is inserted into the
base ring 126 in an axial direction, the four pins 174 will engage
the four key slots 166. The pins 174 will pass through the axial
legs 168. The cover 144 is then rotated, and the pins 174 will
enter the transverse legs 170. At this point, the cover 144 cannot
be removed axially, and the cover is removably latched to the base
ring 126. To remove the cover 144, rotate the cover in the opposite
direction and pull it outward.
[0045] Numerous modifications and alternative embodiments of the
invention will be apparent to those skilled in the art in view of
the foregoing description. Accordingly, this description is to be
construed as illustrative only and is for the purpose of teaching
those skilled in the art the best mode of carrying out the
invention. Details of the structure may be varied substantially
without departing from the spirit of the invention and the
exclusive use of all modifications that will come within the scope
of the appended claims is reserved.
TABLE-US-00001 PARTS LIST INSPECTION PORT Part NO. DESCRIPTION 20
inspection port 22 panel 24 mounting hole 26 base ring 27 base ring
longitudinal axis 28 base ring circular wall 30 circular wall first
end 32 circular wall second end 34 base inner surface 36 base outer
surface 38 base ring flange 40 O-ring groove 42 annular ridges 44
cover 45 cover longitudinal axis 46 cover circular wall 48 circular
wall first end 50 circular wall second end 52 cover inner surface
54 cover outer surface 56 cover plate 57 finger recess 58 cover
flange 60 O-ring 62 louvers 66 key slots 68 key slot axial leg 70
key slot transverse leg 74 pins 120 inspection port 122 panel 124
mounting hole 126 base ring 127 base ring longitudinal axis 128
base ring circular wall 130 circular wall first end 132 circular
wall second end 134 base inner surface 136 base outer surface 138
base ring flange 140 O-ring groove 142 annular ridges 144 cover 145
cover longitudinal axis 146 cover circular wall 148 circular wall
first end 150 circular wall second end 152 cover inner surface 154
cover outer surface 156 cover plate 157 finger recess 158 cover
flange 160 O-ring 162 louvers 166 key slots 168 key slot axial leg
170 key slot transverse leg 174 pins
* * * * *