U.S. patent application number 10/942107 was filed with the patent office on 2005-05-05 for strainer for oil supply mouth.
This patent application is currently assigned to DAIWA SEIKO, INC.. Invention is credited to Uto, Ryoji, Yagi, Hiroshi.
Application Number | 20050092553 10/942107 |
Document ID | / |
Family ID | 34430926 |
Filed Date | 2005-05-05 |
United States Patent
Application |
20050092553 |
Kind Code |
A1 |
Yagi, Hiroshi ; et
al. |
May 5, 2005 |
Strainer for oil supply mouth
Abstract
The invention is an object of the invention to provide a
strainer for an oil supply mouth, preventing the oil flowing when
supplying the oil from colliding with the float so as to accurately
detect the height of the liquid level. The strainer for an oil
supply mouth of the invention has a guide hole equipped in vertical
directions and a float for an oil level gauge passing movably in
vertical directions through this guide hole. When the oil comes up
to an at least reference liquid level, the float is received at a
lower end within the guide hole.
Inventors: |
Yagi, Hiroshi; (Sayama-shi,
JP) ; Uto, Ryoji; (Akashi-shi, JP) |
Correspondence
Address: |
SUGHRUE MION, PLLC
2100 PENNSYLVANIA AVENUE, N.W.
SUITE 800
WASHINGTON
DC
20037
US
|
Assignee: |
DAIWA SEIKO, INC.
SHIN CATERPILLAR MITSUBISHI LTD.
|
Family ID: |
34430926 |
Appl. No.: |
10/942107 |
Filed: |
September 16, 2004 |
Current U.S.
Class: |
184/105.1 ;
184/6.5 |
Current CPC
Class: |
G01F 23/58 20130101 |
Class at
Publication: |
184/105.1 ;
184/006.5 |
International
Class: |
F01M 011/04 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 17, 2003 |
JP |
P. 2003-325262 |
Claims
What is claimed is:
1. A strainer comprising: a body; a guide hole formed in a vertical
direction through a body; and a float for oil level gauge that
passes movably in the vertical direction through the guide hole,
wherein the float is received at a lower end within the guide hole
when oil comes to an at least reference liquid level.
2. The strainer according to claim 1, wherein when the float places
at a lower part of the guide hole, a lower end of the float
projects from the guide hole in the vertical direction.
3. The strainer according to claim 1, wherein the guide hole
includes a bottom portion for restraining the float from moving
downward.
4. The strainer according to claim 1, wherein a nozzle is projected
from the body, and the guide hole is extended to a nozzle.
5. A strainer for an oil supply mouth comprising: a network part
for filtering impurities; a frame body for supporting the network
part, that is formed to be substantially in a cup shape, and
includes an opening at a upper part thereof; a guide hole formed in
a vertical direction through the frame body; and a float for an oil
level gauge which is inserted movably in the vertical direction
within the guide hole.
6. The strainer according to claim 5, wherein the guide hole
includes an opening at the upper side, and the float is detachably
inserted in the guide hole from the opening.
7. The strainer according to claim 5, wherein the float includes,
at the upper end, a stopper for contacting with an opening of the
guide hole.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a strainer to be attached
to an oil supply mouth of an oil tank provided to heavy weight
machinery such as construction equipment for preventing impurities
from entering into the oil tank during supplying an oil, and to a
strainer for an oil supply mouth having a float for an oil gauge
enabling to detect a position of a liquid level.
[0002] In general, the above mentioned strainer for oil supply
mouth (called briefly as "strainer" hereafter) is formed to be like
a cup and structured by securing network bodies to surround a
periphery of a frame, and this is attached as fitted into the oil
supply mouth. When attaching the strainer and inserting an oil
supply hose, impurities can be caught by the network body.
[0003] By the way, when attaching the strainer to the oil supply
mouth, a height of a liquid level within the oil tank cannot be
visually recognized from the outside during supplying the oil. As
disclosed in Patent Literatures 1 and 2, such structures are known
in which the strainer is provided with the float for the oil level
gauge floating in response to rising of the liquid level. Seeing
the float rising, a supplying person recognizes that the liquid
level reaches a right position. Specifically, Patent Literature 1
discloses a structure of supporting movably in the vertical
direction the float floating in response to rising of the liquid
level in the strainer body, while Patent Literature 2 discloses a
structure of supporting movably in the vertical direction a
spherical float attached to a rod at an outside lower side of the
strainer body.
[0004] Patent Literature 1: Utility Model No. 2508286
[0005] Patent Literature 2: Patent No. 3147688
[0006] However, in the strainer disclosed in Patent Literature 1,
since the float is supported at the inside of the strainer body,
there is a problem that when inserting the oil supply hose to
supply the oil, the flowing of the oil collide with the float, so
that the float spoils stability and fluctuates up and down, and the
height of the liquid level cannot be accurately detected.
[0007] In the strainer disclosed in Patent Literature 2, the float
is supported outside of the strainer, and the oil can be prevented
from directly colliding with the float during supplying the oil as
Patent Literature 1, but there is a problem that since the
circumferential wall of the strainer is formed with the network
body, the flowing of the supplying oil passes through the network
body and collides with the float (particularly, the spherical
floating part exposed outside), and as a result, even when the oil
comes up to the reference liquid level, the float loses stability,
and the height of the liquid level cannot be accurately
detected.
SUMMARY OF THE INVENTION
[0008] Paying an attention to these problems, it is an object of
the invention to provide a strainer for an oil supply mouth,
preventing the oil flowing when supplying from colliding with the
float so as to accurately detect the height of the liquid
level.
[0009] In order to solve the aforesaid object, the invention is
characterized by having the following arrangement.
[0010] (1) A strainer comprising:
[0011] a body;
[0012] a guide hole formed in a vertical direction through a
body;
[0013] a float for oil level gauge that passes movably in the
vertical direction through the guide hole, wherein the float is
received at a lower end within the guide hole when oil comes to an
at lest reference liquid level.
[0014] (2) The strainer according to (1), wherein when the float
places at a lower part of the guide hole, a lower end of the float
projects from the guide hole in the vertical direction.
[0015] (3) The strainer according to (1), wherein the guide hole
includes a bottom portion for restraining the float from moving
downward.
[0016] (4) The strainer according to (1), wherein the strainer is
projected at its lower part with a nozzle, and the guide hole is
extended to a nozzle.
[0017] (5) A strainer for an oil supply mouth comprising:
[0018] a network part for filtering impurities;
[0019] a frame body for supporting the network part, that is formed
to be substantially in a cup shape, and includes an opening at a
upper part thereof;
[0020] a guide hole formed in a vertical direction through the
frame body; and
[0021] a float for an oil level gauge which is inserted movably in
the vertical direction within the guide hole.
[0022] (6) The strainer according to (5), wherein the guide hole
includes an opening at the upper side, and the float is detachably
inserted in the guide hole from the opening.
[0023] (7) The strainer according to (5), wherein the float
includes, at the upper end, a stopper for contacting with an
opening of the guide hole.
[0024] Depending on the strainer for the oil supply mouth of the
invention, when the oil comes to the reference liquid level during
supplying the oil, since the flowing of the oil is prevented from
colliding with the float for the oil level gauge, the float is made
stable, so that the height of the liquid level can be accurately
detected. That is, because the float for the oil level gauge is
inserted in the guide hole formed to be hollow in the frame
composing the strainer body, the float can be smoothly attached to
the oil supply mouth, and at the same time, the portions of the
guide hole or the float formed in the frame body are avoided from
breakage when attaching them or supplying the oil.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 is a vertical cross sectional view showing the first
embodiment of the strainer according to the invention;
[0026] FIG. 2 is a plan view along A-A line of FIG. 1;
[0027] FIG. 3 is a vertical cross sectional view showing the
condition of attaching the strainer shown in FIG. 1 to the oil
supply mouth;
[0028] FIG. 4 is a vertical cross sectional view showing the
condition where the liquid level of the oil rises after the
strainer is attached to the oil supply mouth;
[0029] FIGS. 5A and 5B show the structural examples of the floats,
respectively;
[0030] FIG. 6 is a vertical cross sectional view showing the second
embodiment of the strainer according to the invention;
[0031] FIG. 7 is a plan view along B-B line of FIG. 6;
[0032] FIG. 8 is a vertical cross sectional view showing the
condition of attaching the strainer shown in FIG. 6 to the oil
supply mouth;
[0033] FIG. 9 is a vertical cross sectional view showing the
condition where the liquid level of the oil rises after the
strainer is attached to the oil supply mouth;
[0034] FIG. 10 is a vertical cross sectional view showing the third
embodiment of the strainer according to the invention;
[0035] FIG. 11 is a plan view along C-C line of FIG. 10;
[0036] FIG. 12 is a vertical cross sectional view showing the
condition of attaching the strainer shown in FIG. 10 to the oil
supply mouth;
[0037] FIG. 13 is a vertical cross sectional view showing the
condition where the liquid level of the oil rises after the
strainer is attached to the oil supply mouth;
[0038] FIG. 14 is a vertical cross sectional view showing the
fourth embodiment of the strainer according to the invention;
[0039] FIG. 15A is a plan view along D-D line of FIG. 14, and Fig.
B is a plan view along E-E line of FIG. 14;
[0040] FIG. 16 is a vertical cross sectional view showing the
condition of attaching the strainer shown in FIG. 14 to the oil
supply mouth; and
[0041] FIG. 17 is a vertical cross sectional view showing the
condition where the liquid level of the oil rises after the
strainer is attached to the oil supply mouth.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0042] In the following description, specific explanation will be
made to the embodiment of the strainer for the oil supply
mouth.
[0043] FIGS. 1 to 5B are views showing the first embodiment of the
strainer according to the invention, in which FIG. 1 is a vertical
cross sectional view of the strainer, FIG. 2 is a plan view along
A-A line of FIG. 1, FIG. 3 is a vertical cross sectional view
showing the condition of attaching the strainer shown in FIG. 1 to
the oil supply mouth, FIG. 4 is a vertical cross sectional view
showing the condition where the liquid level of the oil rises (the
condition of the reference liquid level) after the strainer is
attached to the oil supply mouth, and FIGS. 5A and B show the
structural examples of the floats, respectively.
[0044] The strainer body is formed to be cylindrical (almost cup
shaped) with a bottom opening upward, and according to the present
embodiment, the strainer 1 is formed as a circular cylinder having
a bottom corresponding to a diameter of the oil supply mouth 21 of
the oil tank 20. The body 1 has a frame body 3 maintaining its
inherent rigidity and avoiding breakage, and a net part 5
(including a substantially network part) of passing the oil into
the oil tank while filtering impurities. In this case, the frame
body 3 is formed with an upper frame 3a, a bottom frame 3b, a
plurality of vertical frames 3c, and one lateral frame 3d, said
upper frame 3a being formed to be cylindrical extending downward to
a predetermined length from the edge of the oil supply mouth, said
bottom frame 3b, as shown in FIG. 2, being formed with a circular
frame and a crossed frames laid in the circular frame, said
plurality of vertical frames 3c being arranged in the vertical
directions (toward the bottom from the opening) of the strainer
body 1 connecting the frames 3a and 3b almost equidistantly, and
said lateral frame 3d connecting the lateral frames 3c at the
center position in the circumferential direction. This lateral
frame 3d may be plural or absent. The upper frame 3a is provided
with a flange 3e at an upper opening place, protruding outside in
the diameter to be hooked by the oil supply mouth 21 of the oil
tank 20. Further, the net part 5 covers the frames and forms the
circumferential and bottom walls.
[0045] Of the plural frames composing the frame body 3, one of the
vertical frames 3c extending in the axial direction (vertically) of
the main body 1 when being attached to the oil supply mouth 21, is
unified as one body with a guide hole 7 being hollow and opening at
the upper and lower ends, and the vertical frames 3c are formed to
be tubular, and in the guide hole 7, the float 10 for an oil level
gauge is inserted movably in the vertical directions.
[0046] In this case, in one of the vertical frames 3c, the guide
hole 7 is formed in the vertical directions from the upper part to
the bottom part of the strainer body 1 in the axial direction of a
projected part 3' shaped in a pillar toward the inside of the
strainer body 1, and this guide hole 7 is formed to be larger than
the diameter of the float 10 so as to vertically move the float 10
having a diameter almost equal in the length direction. By the way,
the portion formed with the guide hole 7 may be the vertical frame
3c, or is sufficient with another position from the position
disposed with the vertical frame, which (portion) projects inside
or outside with respect to the circumferential wall of the body 1,
otherwise may be a projected part inside and outside, or the frame
may be formed separately from the strainer body 1.
[0047] The strainer body 1 composed of the frame body 3 having the
guide hole as mentioned above and the net part 5 maybe unified as
one body with a material such as a synthetic resin or a metal.
Otherwise, the frame body 3 and the net body 5 are formed
individually, and the net part 5 is provided to the frame body 3
with such as an adhesive.
[0048] The float 10 is structured as a bar like hollow member in
circular cross section (a pillar shape) by a blow molding, and its
upper side is a rod portion 10a of narrow diameter, while the lower
side is the float portion 10b of thick diameter having buoyancy
with respect to the oil. In this case, the rod portion 10a and the
float portion 11b may be hollow overall, but for example, as shown
in FIG. 5B, the rod portion 10a maybe solid. Otherwise, not being
hollow, those portions may be formed with a foamed substance, or
formed as one body with materials being lighter in specific gravity
than that of the supplied oil. Preferably, the outside of the float
10 is color-divided as S1 and S2 in the rod part 10a, for example,
as shown in FIG. 5A, such that a maximum amount of supporting the
oil (the reference liquid level) determined by a heavy weight
machine can be visually recognized, or a mark as S2 is given to a
position corresponding to the upper opening of the guide hole 7
when reaching the maximum amount of supporting the oil.
[0049] The float 10 is inserted at its lower float portion 10b into
an upper opening 7a of the guide hole 7 and enters into the guide
hole, and is formed at the upper part with a stopper 10c projecting
in the circumferential direction to prevent dropping into the oil
tank by contacting to the opening 7a of the guide hole. The length
of the float 10 may be shorter than the axial length of the guide
hole 7, or maybe long as projecting out of the lower opening 7b of
the guide hole 7 as shown in FIG. 3. If the float 10 has the length
projecting at the lower end out of the opening 7b as shown in FIG.
3, this length is to an extent that the lower end is received
within the guide hole 7 when the liquid level of the oil rises so
that the float 10 goes up. Specifically, if the float 10 has the
length to the extent that its lower end is received within the
guide hole 7 at least when the oil reaches the reference liquid
level, such a length is sufficient.
[0050] The structured strainer as mentioned above is, as shown in
FIG. 3, mounted in that, after removing a cap (not shown) for the
oil supply mouth, the strainer body 1 is inserted into the oil
supply mouth 21 of the oil tank 20. At this time, the flange 3e
formed at the upper opening position of the upper frame 3a is
disposed by hooking on a receiving part 21a of the oil supply mouth
21. Under this condition, an oil supply hose (not shown) is
inserted into the upper opening part of the strainer body 1 to
supply the oil.
[0051] In this case, since the float 10 is inserted in the guide
hole 7 formed to be tubular in the frame body 3, it does not
contact the inner circumference of the oil supply mouth 21 or the
oil supply hose, nor cause an obstruction when inserting the
strainer body 1, or it is prevented from breakage when supplying
the oil. That is, the strainer body can be smoothly attached to the
oil supply mouth 21.
[0052] When the liquid level goes up in the oil tank by supplying
the oil, and contacts the lower end of the float part 10b of the
float 10 via the lower opening 7b of the guide hole 7, the float 10
begins to rise, and as shown in FIG. 4, it is visually recognized
through the color-division or a mark given to the float 10 that the
float 10 comes to the predetermined reference liquid level, and the
oil supply is thereby finished. At this time, when the float part
10b begins to rise, since the lower end thereof is held within the
guide hole 7, the float 10 is not influenced by the flowing of the
oil- and can stably go up, and further, also when the oil comes to
the reference liquid level, the float 10 is held at its lower end
(the float part 10b) in the guide hole, and the oil flowing is
avoided from directly contacting the float 10 when supplying the
oil, so that the height in the liquid level can be accurately
detected. Subsequently, by closing the cap of the oil supply mouth
21 while inserting the float 10, the float 10 is supported by the
strainer body under the condition of being placed within the guide
hole 7.
[0053] In the above mentioned structure, since the float 10 is
detachably inserted, the only float can be easily exchanged, and
since the float 10 is formed at the upper part with the stopper 10c
projecting in the circumferential direction to prevent dropping by
error into the oil tank by decreasing of the oil amount in the oil
tank.
[0054] Next, another embodiment of the invention will be explained.
In the under mentioned embodiment, the same composing elements as
those of the first embodiment will be given the same reference
signs to omit detailed explanation.
[0055] FIGS. 6 to 9 are views showing the second embodiment of the
strainer according to the invention, in which FIG. 6 is a vertical
cross sectional view of the strainer, FIG. 7 is a plan view along
B-B line of FIG. 6, FIG. 8 is a vertical cross sectional view
showing the condition of attaching the strainer shown in FIG. 6 to
the oil supply mouth, and FIG. 9 is a vertical cross sectional view
showing the condition where the liquid level of the oil rises (the
condition of the reference liquid level) after the strainer is
attached to the oil supply mouth.
[0056] Similarly to the above mentioned embodiment, of the plural
frames composing the frame body 3, one of the vertical frames 3c is
formed with a swelling part 3f in a half-pillar shape inside of the
strainer body 1, and is here unified as one body with the guide
hole 7 being hollow and opening at the upper and lower end. The
float 10 for an oil level gauge is inserted movably in the vertical
directions into the guide hole 7. In this case, the swelling part
3f is defined at the lower end with a bottom 12 so that the float
10 is restrained from moving downward. The swelling part 3f formed
with the guide hole 7 is formed outside and at the bottom 12 with a
plurality of openings 13 communicating with the guide hole 7, so
that the oil freely flows into the guide hole 7.
[0057] The structured strainer as mentioned above is, as shown in
FIG. 8, mounted in that, after removing the cap (not shown) for the
oil supply mouth, the strainer body 1 is inserted into the oil
supply mouth 21 of the oil tank 20. When the oil is supplied under
this condition and the liquid level begins to rise within the oil
tank 20, the oil flows into the guide hole 7 via the plurality of
openings 13 formed in the bottom 12 of the guide hole 7 and the
swelling part 3f, and the oil flows into the guide hole 7 so that
the float 10 begins to rise, and as shown in FIG. 9, it is visually
recognized through the color-division or mark made to the float 10
that the float 10 comes to the predetermined reference liquid
level.
[0058] According to this structure, since the float 10 is
completely received within the guide hole 7, it rises stably
without being directly influenced by the oil flowing, and when the
oil comes up to the reference liquid level, the liquid level can be
accurately detected. By the way, the positions, the number, the
dimensions of the openings 13 formed in the swelling part 3f can be
deformed at disposal. Instead of the openings, cutouts may be
formed for exposing the float 10 at the middle part outside of the
strainer body 1.
[0059] FIGS. 10 to 13 are views showing the third embodiment of the
strainer according to the invention, in which FIG. 10 is a vertical
cross sectional view of the strainer, FIG. 11 is a plan view along
C-C line of FIG. 10, FIG. 12 is a vertical cross sectional view
showing the condition of attaching the strainer shown in FIG. 10 to
the oil supply mouth, and FIG. 13 is a vertical cross sectional
view showing the condition where the liquid level of the oil rises
(the condition of the reference liquid level) after the strainer is
attached to the oil supply mouth.
[0060] Similarly to the above mentioned embodiment, of the plural
frames composing the frame body 3, one of the vertical frames 3c is
formed with a swelling part 3g in a half-pillar shape outside of
the strainer body 1, and is here unified as one body with the guide
hole 7 being hollow and opening at the upper and lower end. The
float 10 for an oil level gauge is inserted movably in the vertical
directions into the guide hole 7. The swelling part 3g formed with
the guide hole has the length to the extent that the lower end of
the float 10 projects out of the lower opening 7b of the guide hole
7 under the condition that the stopper 10c contacts the opening 7a
of the guide hole 7. Specifically, such a length is sufficient that
when the oil reaches near the reference liquid level, the length to
the extent that the lower end of the float 10 is received within
the guide hole 7. The swelling part 3g formed with the guide hole 7
is formed outside thereof with a plurality of openings 13
communicating with the guide hole 7, so that the oil freely flows
into the guide hole 7 (since the oil flows from the lower opening
7b of the guide hole 7, the above mentioned openings 13 may be
absent).
[0061] The structured strainer as mentioned above is, as shown in
FIG. 12, mounted in that, after removing the cap (not shown) for
the oil supply mouth, the strainer body 1 is inserted into the oil
supply mouth 21 of the oil tank 20. When the oil is supplied under
this condition and the liquid level begins to rise within the oil
tank 20, the oil flows into the guide hole 7 via the plurality of
openings 13 formed in the lower opening 7b of the guide hole 7 and
outside of the swelling part 3g, and the oil flows into the guide
hole 7 so that the float 10 begins to rise, and as shown in FIG.
13, it is visually recognized through the color-division or mark
made to the float 10 that the float 10 comes to the predetermined
reference liquid level.
[0062] Also in this structure, the float 10 projects at its lower
end (the float 10b) out of the guide hole 7 when beginning to
supply the oil, but the float 10 goes up as rising of the liquid
level of the oil, and when coming up to the reference liquid level,
the float 10 is received at its lower end within the guide hole 7,
so that the liquid level can be accurately detected without being
influenced by the oil flowing.
[0063] FIGS. 14 to 17 are views showing the fourth embodiment of
the strainer according to the invention, in which FIG. 14 is a
vertical cross sectional view of the strainer, FIG. 15A is a plan
view along D-D line of FIG. 14 and FIG. 15B is a plan view along
E-E line of FIG. 14, FIG. 16 is a vertical cross sectional view
showing the condition of attaching the strainer shown in FIG. 14 to
the oil supply mouth, and FIG. 17 is a vertical cross sectional
view showing the condition where the liquid level of the oil rises
(the condition of the reference liquid level) after the strainer is
attached to the oil supply mouth.
[0064] Similarly to the above mentioned embodiment, of the plural
frames composing the frame body 3, one of the vertical frames 3c is
formed with a swelling part 3h in an almost pillar shape inside of
the strainer body 1, and is here unified as one body with the guide
hole 7 being hollow and opening at the upper and lower end. The
float 10 for an oil level gauge is inserted movably in the vertical
directions into the guide hole 7. At the lower end of the swelling
part 3h formed with the guide hole, a nozzle 15 receiving the lower
end of the float 10 is formed as one body with a bottom frame 3b so
that the lower end projects from the bottom frame 3b, and the float
10 is received at its lower end within the nozzle 15 under a
condition that the stopper 10c formed at the upper end of the float
10 contacts the opening 7a of the guide hole 7. In this case, the
guide hole 7 extends in the nozzle 15 having the opening 15a via
which the old freely flows into the guide hole 7. The swelling part
3h formed with the guide hole 7 may be formed outside thereof with
a plurality of openings communicating with the guide hole 7
similarly to the above mentioned embodiments.
[0065] The structured strainer as mentioned above is, as shown in
FIG. 16, mounted in that, after removing the cap (not shown) for
the oil supply mouth, the strainer body 1 is inserted into the oil
supply mouth 21 of the oil tank 20. When the oil is supplied under
this condition and the liquid level begins to rise within the oil
tank 20, the oil flows into the guide hole 7 via the lower opening
15a of the nozzle 15, and the oil flows into the guide hole 7 so
that the float 10 begins to rise, and as shown in FIG. 17, it is
visually recognized through the color-division or mark made to the
float 10 that the float 10 comes to the predetermined reference
liquid level.
[0066] Depending on this structure, since the oil flowing does not
contact the float 10 before the liquid level reaches the float 10,
the float 10 avoids breakage without being influenced by the oil
flowing, and stably rises, and also when the oil comes to the
reference liquid level, the liquid level can be accurately
detected. Further, even if the reference liquid level is lower than
the strainer body 10, the strainer body 10 can be applied by
appropriately extending the nozzle 15.
[0067] The embodiments according to the invention have been
explained, and the strainer of the invention is not limited to the
illustrated structures, and various modifications are
available.
[0068] For example, shapes of the frame body 3 are sufficient if
being formed almost in cup as a whole, and the disposing structure
of the frame composing the frame body is appropriately varied. With
respect to the guide hole 7, in the frames composing the frame body
3, other than being formed at the frame part extending in the axial
direction, the guide hole 7 is sufficient if being structured to
guide the float merely vertically, and may be formed separately
from the frame body 3 or attached to the strainer body 1. Further,
in regard to the guide hole 7, the hole shapes, the axial length,
thickness, or piece number may be appropriately deformed, and the
guide hole 7 and the part to be formed with the guide hole (the
swelling part, or vertical frame) are sufficient if being
structured to vertically move the float 10. The shapes, or the
composing materials of the float may be appropriately modified, for
example, the float may have such a structure not taking off from
the guide hole.
[0069] The network part is not limited to the net part and includes
a member shaped in network, and further includes a member which
have a same effect of the net part. For example, a filter having
porous structure that filters impurities is included in the network
part according to the invention. The porous structure can have
various size and various shape.
* * * * *