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Priority claim, 7-condyle 1 (4 U.S. 8, inventor i conquer i), = work 22. 4-a,. ■ Japanese Patent
Application Laid-Open Publication No. (1974) 11.18 examination request unclaimed (all five
pages) The title of the invention Synthetic hose (1) A substantially non-porous synthetic resin
inner pipe and an electrically insulating layer, and the circumferential surface of said layer A
semiconductive synthetic resin layer having an electrical resistance of at most about 500 ohmcentimeter disposed in intimate contact with the conductive layer, a conductive braid adjacent to
the semiconductive layer, and the layer assembly Synthetic hose consisting of an abrasion
resistant exterior on top of
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to
synthetic tubes or hoses, and in particular to hoses adapted for use as air-insulated paint supply
hoses with air atomization spray guns. Electrostatic paint spray devices are widely used in paint
spray operations-such devices must hold the spray gun by hand and have a conveyor to move the
workpiece in front of the stationary gun and the gun doing. The paint can be filled to a potential
of 25 to 150 kilovolts, usually 75 to 100 kilovolts, at the spray gun or paint supply tank to create
an electric field. The electrical force of the paint particles selectively drives the particles to the
grounded workpiece to reduce waste from excessive spraying. Electrically conductive paint must
be transported from the supply to the spray gun using an electrically insulated hose in such a
spray device. Accordingly, it is an object of the present invention to provide a paint horn that is
adapted for use in an electrostatic spray device. Another object of the present invention is to
provide a synthetic hose which resists the negative effects normally encountered in paint
spraying operations and still effectively insulate the charged paint in the hose. Another object of
the present invention is to provide a synthetic hose which is fixed from a paint source and made
EndPage: 1 to transport the rod to the nine spray guns. Yet another object of the present
invention is charging in the hose It is an object of the present invention to provide a flexible
synthetic hose which effectively insulates the paint and transports the paint from the paint
source to the hand spray gun. Other objects will become apparent from the following description
with reference to the accompanying drawings, which are achieved according to the invention as
follows. That is, generally speaking, a core or inner tube that resists chemical corrosion due to a
water-based paint or the like, and a substance of an electrically insulating synthetic resin that can
substantially prevent leakage of the electrostatic charge of the paint used in the electrostatic
spray device. Non-porous layer, an adjacent semiconductive layer on the periphery of the
insulating layer, a lead conductor wound in electrical contact around the semiconductive layer,
and a circumferential surface of the conductor Provide a synthetic tube or hose with a wear
resistant outer sheath-The actual tube wall thickness is a synthetic resin that is chemically
resistant to the fluid to be transported through the hose and a suitable electrical insulator If used,
the inner tube and the insulating layer can be combined into a single tube. Such front hoses can
be used to serve any device for transporting electrostatically charged paint or other fluid.
This hose is supplied from the feed section to the spray gun of an electrostatic spraying device
such as the illustrated and described apparatus described in U.S. Pat. No. 1,645,447, for example.
It is particularly advantageous to transport the Now, in FIG. 1 and in FIG. 2, one embodiment of
the present invention is shown as a synthetic hose 1o. In this embodiment, the hose 1 has an
extruded polyethylene inner tube 11 of sufficient thickness to prevent leakage of static charge,
and a carbon black material disposed substantially in electrical contact with the surface of this
layer 11 substantially containing carbon black. A non-porous or extruded ethylene-vinyl acetate
copolymer layer 13 and the circumference of layer 13 K) stainless steel wire braid 41114 wound
in intimate contact, and a polyurethane outer device 5 resistant to abrasion. This example is
adapted to use polyethylene with a chemical, non-corrosive paint. Another embodiment of the
present invention, insulated to carry a conductive fluid such as a water-based paint, without a
ground, is shown in FIGS. 3 and 4 as a hose 1of. The hose 10 'is a relatively thin-thick nylon
inner tube 11 and a substantially non-porous polyethylene layer 12 of a non-perforated side tube
110 circumference 9 having a sufficient thickness to prevent leakage of electrostatic charge. And
in intimate contact with a substantially non-porous extruded ethylene-vinyl acetate copolymer
layer 13 containing carbon black disposed in electrical kII contact with the surface of the layer
12 and the layer 13 And a stainless steel wire-assembled portion 14 and a polyurethane outer
device 5 which is wear resistant. The inner tube 11 is preferably nylon extruded if the hose is
used for the transport of water jet paint since it is resistant to chemical corrosion by such paint
However, the inner tube 11 may be any other synthetic resin that is resistant to chemical
corrosion by the fluid to be transported by a hose, eg, tetrafluor ethylene polymer silicone,
elastomeric polyurethane, E.I .. DuPont Di Nemos Company (II !, Engineering, dup □ Ht (16 x @
m □ nrs + & Co,) KX? 2.) Polytetramethylene ether glycol such as Hytrel (Hytrel) sold and 1.4butane, diol ester or other di-dystomer polyester or cobalt ester of terephthalic acid and
isophthalic acid, poly ポ リ tyrene, polypropylene Polyolefins like this are ethylene-provin copoly
ff +, heat-plasticity styrene-butadiene rubber (8BB), styrene-isoprene thermoplastic rubber (8 R),
heat: tqll I rubber, Rubber and mixtures thereof etc.-When the inner tube serves as a combination
of the inner tube and the insulating layer, Inc., the insulating layer 12 and the inner tube 11
company, an extrudable surface synthetic resin and the static of the fluid being transported : 2
has sufficient electrical resistance to prevent leakage of electric charge For example, any
synthetic resin having a dielectric strength may be used. For example, polyethylene, polyolefin
such as polypropylene, ethylene- Propylene copolymers, polyvinyl chloride polymers or
copolymers of nine companies, polytetramethylene ether glycols such as Hitrel, and 1,4-phthalic
acid of terephthalic acid and isophthalic acid, diol esters and so forth + a other nidistomersPolyester copolyesters, thermoplastic styrene-butadiene rubber (8BR) and thermoplastic rubbers
such as styrene-isoprene thermoplastic rubber (Town R), etc., mixtures of which are used before
their practical surface thickness Prevent the leakage of static charge.
The semiconductive layer 13 may be any suitable St synthetic resin containing other conductive
particles, such as carbon black or metal particles, which form a coating substantially in contact
with the surface of the inner tube 11 or the insulating layer 120 And at most about 500 ohmsenna meter, preferably about 10 to 100 ohm-centimeter electrical resistance. 金属 Metal
particles may be, for example, aluminum. Suitable resins include rubber, elastomeric
polyurethane, polychlorinated. Vinyl polymers or copolymers, polyethylene, polypropylene 5 '&
polyolefins and ethylene-propylene, copolymers, styrene-butadiene thermoplastic rubber' C3BR),
thermoplastic rubbers such as styrene-isoprene thermoplastic rubber, mixtures thereof Etc. The
semiconductive layer 15 is preferably covered with a semiconductive tape such as a carbon
impregnated cloth tape, but is preferred because it is in greater contact with the extrusion
coating company, uniformity) and the underlying layer 11t or 12. However, the coating 15 can
be provided by immersion, electrodeposition, spraying or other suitable means. The Ill5I
assembly 14 may be any suitable electrical conductor, such as, for example, stainless steel wire,
steel wire, aluminum wire, and the like. # 杜, must be strong enough to withstand 411 times with
a conventional wire layer assembly machine without breakage e. Suitable abrasion resistant outer
devices 5 such as rubber, elastomeric polyurethane, nylon Polyvinyl chloride polymers or
copolymers, surface polyolefins such as polyethylene and polypropylene, thermoplastic rubbers
such as styrene-butadiene (8BR) and bamboo-styrene-isoprene rubber (81R) can be used. The
hoses can be made of variable length and cut to the desired length when installed on the spray
assembly. ° Each layer of hose is ground over its length K. Therefore, if the hose is cut to a
length of 4 [h], the end of the wire forming the cage is exposed. Kl to deposit hoses in the paint
supply tank! Due to the sprinkling odor used), i 9 removes one layer 15.14 and 13 from the end
placed there to avoid being grounded by the spray gun, and the line exposed K to avoid bin tip
arc between the end and the paint at the end of the hose, fold the end of the layer 13 back to the
end of the outer device 5 and its ridge end to the fangs 1 and 3 As shown at the left end of the
hose of the above, apply a layer 13 to cover.
After installation, a portion of the outer device 5 is removed and the ground wire is electrically
connected to the wire assembly, somewhere along the length of the hose, usually near the paint
supply j-nk. The conductive band at one end of the ground wire may be attached to the
circumference of the braided portion J) to ensure electrical contact. The semiconductive layer 13
exhibits a relatively low resistance continuous ground path, thereby providing grounding There
is no possibility of high electrical pressure points that could cause a JIK of the inner tube when it
is discharged, and the wire layer assembly 14 is able to resist all points of any length of hose
Helps to be substantially identical. If * igi assembly 14 is removed, the resistance of the long
length hose will be large enough to promote the discharge at locations other than low ground
resistance EndPage: 3 and so the hose will break again It may be triggered.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a broken I11 plane view of an embodiment of
the present invention, FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. Fig. 4 is a
cutaway side view of the embodiment of Fig. 4, and Fig. 4 is a cross-sectional view taken along
the line 4-4 of Fig. 3. · Electrically insulating layer 13 · · · Semiconductive synthetic resin layer 14
· · · Conductive braided portion 15 · · · Wear resistant exterior agent Ezaki Mitsuyoshi agent Ezaki
Prehistory EndPage: 4G attached documents list details 1 drawing 1 drawing 1 letter of attorney
1 priority certificate 1 letter of applicant 2 copies 1 7 Inventors other than the above, agent 113
Inventors address United States, Ohio, Lavena, Oakwood Street, Yo 13 Yue Yui・ Y ・ Whitatsuka
Birthplace USA, Ohio, Mantua, Caldop Poke-Dojiipu, 5ii4L name Lari - Earl Fuiritsubi r'l) dive's
name Attorney (6955λ ratio # Yutake EndPage:5
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description, jps49120221
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