close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3072351

код для вставки
Jan. 8, 1963
M. A. R. POINT ETAL
3,072,341
SPRAY HEAD FOR ELECTROSTATIC SPRAYING APPARATUS
Filed April 22. 1960
6
.
\ \ \
7- -
I’
>\\'\\
4- 3
5
2
244/1441.’
ttorn'eys,
United States Patent Q??ce
3,072,341
Patented Jan. 8, 1963
l
2
3,072,341
without departing from the scope of the present inven
SPRAY HEAD FOR ELECTROSTATIQ SPRAYING
APPARATUS
'
tion. Thus the rib may be formed on the interior sur
face of the collar to engage with a groove on the external
surface of the body 1.
We claim:
1. A spray head for an electrostatic spraying apparatus
for coating objects with a material such as paint, said
spray head comprising a generally cylindrical body por
tion, a collar of an electrically high resistivity material
10 having a resistivity of the order of 106 ohms/ cm. detach
The present invention relates to improvements in ro
ably secured to the external surface of said body portion
and having a part which extends forwadly of the body
tating heads for electrostatic atomisation and spraying,
portion and which includes a tapering edge.
having a sharp or tapered edge for electric leakage and
combining electrical atomising with atomisation by cen
2. A spray head according to claim 1, wherein said
trifugal force. Such heads are employed in portable, 15 high resistivity material is a synthetic resin incorporating
lamp black.
stationary or semi-portable apparatus for coating ob
3. A spray head according to claim 1, wherein said
jects with ?ne particles of material, such as paint for
example.
‘
high resistivity material is a slightly conductive rubber.
4. A spray head according to claim 1, wherein the
It is known that such an electrostatic head may be made
of a material which is only slightly conductive, so as to 20 body portion of the head is made of an electrically con
ducting material.
I
avoid the possible danger which would arise if the head
Marcel Auguste Roger Point and Roger Claudius Morel,
Grenoble, France, assignors to Societe Anonyme de
Machines Electrostatiques, Grenoble, France, a French
body corporate
Filed Apr. 22, 1960, Ser. No. 24,159
Claims priority, application France Apr. 27, 1959
7 Claims. (Cl. 239-224)
is brought close to an object which has a large difference
5. A spray head for an electrostatic spraying appa
of potential relative to it.
ratus for coating objects with a material such as paint,
said spray head comprising a generally cylindrical body
The present invention comprises a rotatable head for
electrostatic atomisation and spraying having a sharp or 25 portion, a collar of a material having a electrical re
tapered edge for electric leakage and combining electrical
sistivity substantially of the order of 1G6 ohms/cm. de
atomising with atomisation by centrifugal force, more
tachably secured to the external surface of said body
particularly for coating objects with substances such as
portion by means of at least one rib on said body por
paint, wherein the head comprises a body portion to
tion which engages with at least one complementary
which is secured a detachable collar which projects for 30 groove on said collar, and a part of said collar which pro
wardly from the body portion and is provided with the
jects forwardly from the body portion and which in
cludes a tapering edge.
sharp or tapering atomisation edge, said collar being
made of a high resistivity material.
6. A spray head for an electrostatic spraying appa
The invention will now be further described with ref
ratus for coating objects with a material such as paint,
erence to the accompanying drawing which is a cross
said spray head comprising a generally cylindrical body
section through one embodiment of atomising head ac
portion, a collar of a synthetic resin material incorpor~
cording to this invention.
ating lamp black having an electrical resistivity substan~
Referring to the drawing, the body 1 of the head is
tially of the order of 106 ohms/cm. detachably secured to
constituted by a rigid generally cylindrical member
the external surface of said body portion by means of at
made of metal or of a high resistivity material, for ex 40 least one rib on said body portion which engages with
ample a suitable plastic material. The external surface
at least one complementary groove on said collar, and a
of this member is provided with a surrounding rib 2 on
part of said collar which projects forwardly from the
which it is easy to ?x a detachable collar 3 having a com
body portion and which includes a tapering edge.
plementary groove 6.
'
7. A spray head for an electrostatic spraying appa
The collar 3 is made of a high resistivity material, for 45 ratus for coating objects with a material such as paint,
example of an epoxy resin having a lamp black or “car
said spray head comprisnig a generally cylindrical body
bon black” ?lling. It could also be made of slightly
portion, a collar of a slightly conducitve rubber having
conductive rubber. Generally speaking, the material
an electrical resistivity substantially of the order of 106
utilised must preferably have a resistivity of the order
ohms/cm. detachably secured to the external surface
of 106 ohms/cm. This being so, the resistance of the 50 of said body portion by means of at least one rib on
head measured between the axis of rotation and the
said body portion which engages with at least one com
plane of the atomisation edge, amounts to a few mego
plementary groove on said collar, and a part of said col
hms. The outlet end of the member 1 may have a rela—
lar which projects forwardly from the body portion and
tively rounded edge 4, while the collar 3 will be pro
which includes a tapering edge.
vided with the sharp or tapering atomisation and spraying 55
edge 5.
j
\
References Cited in the ?le of this patent
This construction has a number of advantages since
it is particularly robust and stands up Well to use.
Moreover by making the collar detachable it can easily
be replaced after wear or deterioration. Additionally 60
it can be replaced by a collar of a different shape in order
to achieve a different spraying effect.
It will be clear that various modi?cations may be made
UNITED STATES PATENTS
2,352,252
2,658,009
Canetta _____________ __ June 27, 1944
Ransberg ____________ __ Nov. 3, 1953
2,781,279
Miller __________ _'______ Feb. 12, 1957
2,901,177
Norris _____________ __ Aug. 25. 1959
Документ
Категория
Без категории
Просмотров
0
Размер файла
191 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа