Information
-
Patent Grant
-
6170759
-
Patent Number
6,170,759
-
Date Filed
Tuesday, August 31, 199924 years ago
-
Date Issued
Tuesday, January 9, 200123 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 239 290
- 239 292
- 239 298
- 239 300
- 239 412
- 239 417
- 239 4173
- 239 4175
- 239 418
- 239 420
- 239 424
- 239 4245
-
International Classifications
-
Abstract
The invention relates to a method and a device for the delivery of adhesives, in particular for the delivery of hot melt adhesives in the form of a thin stream of adhesive spray directed onto the product surface and acted upon by at least one air jet. A spray head (40) is arranged at the one end of the device (45), which comprises a connecting housing (25) for receiving a insertion element (30), provided with an outlet opening (34) for the thin stream of adhesive spray (glue) and embodied as a nozzle conduit, a guide sleeve (35), designed for the coaxial seating of the piston rod (43), as well as a nozzle body (15) with bores (20) arranged in the circumferential direction distributed in respect to each other, in which an air nozzle (10) with an interior chamber, which is embodied to be convergent-divergent in the flow-through direction, is respectively arranged.
Description
FIELD OF THE INVENTION
The invention relates to a method for applying an adhesive to a product surface wherein, by means of a spray head provided with a nozzle body, the adhesive is applied to the product surface to be sprayed as a thin stream of spray in the approximate shape of a spiral, on which at least one air jet acts at the outlet. The invention also relates to a device for executing this method.
BACKGROUND OF THE INVENTION
An arrangement for applying an adhesive to a product surface is known from U.S. Pat. No. 5,065,943, which essentially comprises a spray apparatus and a preparation device for the adhesive functionally connected therewith, as well as an air injection device, which is connected via at least one conduit with a spray head, wherein either a nozzle body, which is embodied in the shape of a disk and fastened by a screw-on cap on the latter, or a cap embodied as a nozzle body, are arranged on the spray head. The nozzle body, which is penetrated by an outlet opening, is provided with several bores, which are distributed in the circumferential direction and are oriented parallel in respect to a frustoconical tip and obliquely in the direction of the exiting thin stream of spray, from each of which an air jet is directed against the exiting thin stream of adhesive spray and the latter is applied in the approximate shape of a spiral to the product surface to be sprayed.
Further, similar arrangements with appropriately embodied spray devices for the spiral-shaped application of a thin stream of adhesive spray to a product surface are known from U.S. Pat. No. 4,969,602, U.S. Re-issued Pat. No. 33,481 and International Patent Publication WO 94/04282, in which the spray head is respectively provided with a nozzle body, which is embodied in the shape of a disk and held by a screw-on cap or the like.
The individual elements of the spray device of the known arrangements, in particular those of the spray head, have a relatively complicated structural design, wherein the nozzle body respectively arranged on and fastened to the spray head and the bores arranged therein has respective production tolerances, which cause an uneven spiral application, and in addition require a fresh time- and cost-consuming readjustment after the nozzle body has been changed.
OBJECT AND SUMMARY OF THE INVENTION
The invention is based on the object of creating a method, as well as a device with a spray head and nozzle body arranged thereon, by means of which a guidance of the adhesive jet can be achieved, which is even and laterally exactly limited in relation to the respective application surface to be sprayed.
Regarding the method, this object is attained in that, for the spiral-shaped delivery and application on the product surface, the thin stream of adhesive spray exiting the spray head is acted upon by at least one air jet, which is accelerated by means of convergent-divergent means of the nozzle body.
The device for executing the method is distinguished in that for obtaining an air jet which exits in an accelerated manner and is directed onto the thin stream of adhesive spray, an air nozzle with an interior chamber which is designed to be convergent-divergent in the flow-through direction, can be respectively inserted into bores of the nozzle body, which bores are charged with air via an associated air conduit, or that the interior chamber of the single bore, which is oriented in the flow-through direction, is designed to be convergent-divergent.
Further characteristics of the invention ensue from the following description in connection with the individual claims and the drawings.
The invention will be described in what follows in connection with the exemplary embodiments represented in the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
represents an installation, shown in a schematic plan view, for the delivery and application of an adhesive in the form of a thin stream of spray to a product surface;
FIG. 2
represents a first exemplary embodiment, shown on a larger scale and partially in section, of a spray head for a spray device which is connected with the installation in accordance with
FIG. 1
;
FIG. 3
represents the individual elements of the spray head in accordance with
FIG. 2
, shown in the disassembled state;
FIG. 4
represents a section along the line IV—IV through a guide sleeve of the spray head in accordance with
FIG. 2
;
FIG. 5
represents an air nozzle for a nozzle body arranged on the spray head in accordance with
FIG. 2
, shown on a larger scale and in section;
FIG. 6
represents a variation of the nozzle body for the spray head in accordance with
FIG. 2
in a sectional view;
FIG. 7
represents a second exemplary embodiment of the spray head for the installation, shown on a larger scale and partially in section;
FIG. 8
represents a spray nozzle for an insertion element arranged in the spray head in accordance with
FIG. 7
, shown on a larger scale and partially in section.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1
represents an installation
75
for the delivery of adhesives, in particular a hot melt adhesive in the form of a so-called thin stream of spray
6
, shown in a schematic plan view. By means of a spray head
40
or
40
′ arranged in the installation
75
, the thin stream of spray
6
is acted upon by at least one air jet in the area of an outlet opening, not represented in
FIG. 1
, and as a result is applied in accordance with the arrow direction
6
′ in the approximate shape of a spiral on a product surface, not represented, which is to be sprayed with the adhesive.
The installation
75
essentially comprises a spray device
45
with the spray head
40
or
40
′ arranged on the one end, as well as a preparation device
46
and an air injection device
47
, which is connected with a compressed air source
74
. The two devices
46
and
47
together with the functional elements arranged therein, can also be arranged together in a one-piece housing. The preparation device
46
is connected via a hose
48
, which is heated by suitable means with a reservoir, not represented, and a pump arranged therein. The adhesive is appropriately liquefied in the reservoir and is supplied through the heated hose
48
to the preparation device
46
, and from there is conducted via a filter
46
′ and a conduit
49
′ connected with it to the spray device
45
. The conduit
49
′ is preferably provided with a heating element
49
, schematically represented in
FIG. 1
, for maintaining a constant temperature of the glue or adhesive.
The spray head
40
or
40
′ arranged on the front end of the spray device
45
can be charged with compressed air from the air injection device
47
, which is connected with the compressed air source
74
. The two devices
46
and
47
, which are functionally connected with the spray device
45
, are sealed against each other by appropriately assigned seals in the conduits which are connected with each other in a manner not represented, and are fastened on each other by means of screw connections, also not represented. Together, the elements
40
or
40
′,
45
,
46
and
47
constitute the installation
75
embodied as a component (FIG.
1
).
In the exemplary embodiment shown, the spray device
45
schematically represented in
FIG. 1
comprises two housings
41
and
42
, which are connected with each other, as well as the spray head
40
or
40
′, arranged on the front end of the first housing
41
. The spray head
40
or
40
′ has a connecting housing
25
, which is connected with the air injection device
47
, as well as a nozzle body
15
or
15
′, arranged and fastened on the housing
25
. The individual elements of the spray head
40
or
40
′ in accordance with the invention will be described in detail in what follows in connection with
FIGS. 2
to
8
.
The spray head
40
, together with the connecting housing
25
and the nozzle body
15
, arranged on the partially represented first housing
41
of the spray device
45
, is shown on an enlarged scale and in section. The connecting housing
25
is fastened by means of several screws
39
(only shown once), which are arranged distributed in the circumferential direction in relation to each other, on the first housing
41
of the spray device
45
, represented partially in section. Furthermore, an insertion element
30
, a guide sleeve
35
with an associated compression spring
44
, which is in functional connection with the latter, as well as a piston rod
43
can be seen in FIG.
2
. On its one end, the piston rod
43
is functionally connected with at least one piston element, not represented, and is coaxially arranged in the interior chamber
41
′ of the first housing
41
, as well as in the individual elements
35
and
30
of the spray head
40
. Depending on the pressure charge on the piston element, or respectively the position elements, the piston rod
43
, which is functionally connected therewith in a manner not represented, can be displaced in accordance with the arrow direction X or X′ (FIG.
2
). On the other, the front end, the piston rod
43
is provided with a partial element
43
′, designed to be tapering conically, and is arranged in the insertion element
30
, which is provided with a correspondingly conically tapering recess
43
′ (FIG.
3
). For the ejection in the form of the thin stream of adhesive spray
6
(FIG.
1
), which is delivered under pressure by means of the not represented piston elements, the insertion element
30
is provided with an appropriately embodied outlet opening
34
.
In connection with a variation, not represented, of the piston rod
43
, a needle-shaped tip can be arranged at the front end of the conically tapering partial element
43
′, which can be inserted into the outlet opening
43
of the insertion element
30
to close it. The tip
43
″ (
FIG. 7
) projects out of the outlet opening
34
by approximately 0.2 mm, so that in this operating position there is no remaining amount of adhesive in the outlet opening
34
embodied as a nozzle conduit. By means of this the formation of drops (glue spots), which leads to malfunctioning of the machine, is prevented at the start of the glue application on the product surface to be sprayed.
As represented in
FIG. 2
, the connecting housing
25
is arranged with a seal
1
in the interior chamber
41
′ of the first housing
41
, the insertion element
30
with a seal
2
in the connecting housing
25
, as well as with a seal
3
in the nozzle body
15
, and the latter with a seal
4
in the connecting housing
25
. The connecting housing
25
is connected with the air injection device
47
via an inlet bore
26
′ arranged on it having the associated seal
5
. The air injection device
47
is fastened on the connecting housing
25
by means of a screw connection, not represented. Also visible in
FIG. 2
is the nozzle body
15
, which is provided with a recess
21
, as well as with bores
20
distributed in the circumferential direction in relation to each other. Respectively one air nozzle
10
is arranged in the individual bores
20
and held in place by means not represented.
The individual elements
15
,
25
,
30
and
35
of the spray head
40
in accordance with
FIG. 2
are represented in
FIG. 3
in the direction of their common axis of symmetry S in the disassembled state as a so-called exploded representation. The elements
15
,
25
,
30
and
35
will be described in what follows.
The nozzle body
15
has a cylindrical partial element
17
, which is provided on one end with a flange
16
formed on it, and on the other end with a shoulder
16
′ formed on it. An annular groove
18
for the seal
4
(FIG.
2
), as well as an exterior thread
17
′ extending up to the rear
22
′, are arranged on the exterior circumference of the cylindrical partial element
17
. On the front
22
, the nozzle body
15
is provided with the recess
21
which has, starting at the front
22
, a conically tapering lateral wall
21
″ in the direction toward an interior wall
21
′. The nozzle body
15
furthermore is provided with a first cylindrical bore
19
and, adjoining it, a second bore
19
′, which is conically tapered in the direction toward the interior wall
21
′ of the recess
21
. The two bores
19
and
19
′, which penetrate the nozzle body
15
in the axial direction are designed for coaxially receiving the insertion element
30
, as represented in FIG.
2
. Several bores
20
are provided on the circularly-shaped back
22
′ of the cylindrical partial element
17
, which are distributed in the circumferential direction and are arranged at distances from each other and penetrate, inclined in the direction of the axis of symmetry S, the cylindrical partial element
17
of the nozzle body
15
starting at the back
22
′.
In the exemplary embodiment represented in
FIG. 3
, the bores
20
of the nozzle body
15
, which are oriented obliquely in the direction of the axis of symmetry S, are embodied for the insertion of a correspondingly designed air nozzle
10
(FIG.
2
). The single air nozzle
10
can be adjusted in the respective bore
20
in its axial direction in respect to the interior wall
21
′ of the recess
21
of the nozzle body
15
. The particular design of the air nozzle
10
will be described in what follows in connection with FIG.
5
.
The connecting housing
25
has a first cylindrical partial element
25
′, as well as a second cylindrical partial element
25
″, designed set off in respect to the latter and with an annular groove
29
for the seal
1
(
FIG. 2
) arranged thereon. Viewed in the axial direction, the connecting housing
25
is penetrated by a first recess
27
, as well as by a second recess
28
, which is designed with a set off diameter in respect to it. In the axial direction, the second recess
28
is bordered by a ring-shaped stop
28
′ and is connected via an opening
28
″ with the first recess
27
. The first recess
27
has a cylindrical partial element
27
′, a partial element
27
″ embodied as an interior thread, and an adjoining annular conduit
26
, which is bordered by an interior wall
26
″. In the assembled state (FIG.
2
), the annular conduit
26
is used as a pressure chamber and is connected via a bore
26
′, which at least penetrates the first cylindrical partial element
25
′ in the radial direction, with the air injection device
47
(FIG.
1
). Furthermore, a groove
24
for the seal
5
(FIG.
5
), which encircles the bore
26
′, is provided on the exterior of the first cylindrical partial element
25
′.
The insertion element
30
has a first cylindrical partial element
31
provided with an annular groove
31
″ for the seal
2
(FIG.
2
), as well as a second partial element
32
, whose diameter is embodied set off in respect to the first and which is provided with an annular groove
32
″ for the seal
3
(FIG.
2
). A third partial element
33
, which is embodied conically tapering, is formed on the front end of the second partial element
32
. Viewed in the axial direction, the insertion element
30
is penetrated by a first bore
31
′, a second bore
32
′ embodied set off in respect to the first and by an adjoining recess
34
′, which is embodied conically tapering in the direction toward the outlet opening
34
.
The guide sleeve
35
has a hollow-cylindrical body
37
, which is provided on one end with a flange
36
and on the other, opposite end with a hub element
36
′ arranged in the interior chamber of the body
37
. The hollow-cylindrical body
37
is penetrated by a first recess
37
′ oriented in the axial direction. The hub element
36
′ has a centering element
38
arranged coaxially in it which, for guiding the piston rod
43
(FIG.
2
), is penetrated by a second recess
38
′, which is in connection with the first recess
37
′ of the hollow-cylindrical body
37
. The hub element
36
′ is penetrated by several bores
38
″, which are arranged distributed in the circumferential direction and through which the adhesive, which is under pressure, is delivered to the insertion element
30
.
FIG. 4
shows a section along the line IV—IV through the guide sleeve
35
, and the hollow-cylindrical body
37
, the hub element
36
′ arranged therein with the centering element
38
and the recess
38
′ arranged therein, as well as the bores
38
″, which are arranged, distributed in the circumferential direction in relation to each other, in the hub element
36
′.
The air nozzle
10
, which can be inserted into single bore
20
of the nozzle body
15
(
FIGS. 2
,
7
), is represented on a larger scale as well as in section in FIG.
5
. The air nozzle
10
of the exemplary embodiment represented consists of an elongated, hollow-cylindrical small tube
11
, which is respectively provided with a set off collar
11
′ and collar
11
″ at the two outer ends. The small tube
11
has an interior chamber
10
′ oriented in the axial direction which, starting at the inlet side
12
, has a convergently designed partial element
12
′, a nozzle throat
13
adjoining it and a partial element
14
′ adjoining the latter and divergently oriented in the direction toward the outlet side
14
. Starting at the inlet side, the convergent partial element
12
′ is provided with a circular wall section
12
″ embodied in the shape of a segment of a circle in the direction toward the nozzle throat
13
, which has a constricted diameter. In the preferred exemplary embodiment, the nozzle throat
13
has a diameter D of approximately 0.3 to 0.6 mm, which is adjoined by the divergent partial element
14
′, which is oriented at an acute angle α in the direction toward the outlet side
14
. The angle α of the divergent partial element
14
′ is approximately
10
in the preferred exemplary embodiment.
In connection with a variation, not represented, of the air nozzle
10
there is the possibility that it only has the partial element
12
′, which is embodied convergent in the direction of the nozzle throat
13
, and is provided, starting at the nozzle throat
13
in the direction of the outlet side
14
, with a cylindrically embodied partial element
14
′.
FIG. 6
shows as a further exemplary embodiment the nozzle body
15
′, represented in section and as a partial element, and the two bores
19
,
19
′ and the recess
21
, the cylindrical partial element
17
with the groove
18
and the exterior thread
17
′ are visible. Essentially the nozzle body
15
′ is embodied analogous to the nozzle body
15
, which was described in detail in connection with FIG.
3
. Different from this, with the nozzle body
15
′ in accordance with
FIG. 6
, the individual bores
20
′, which are obliquely inclined in the direction of the axis of symmetry S (
FIG. 3
) are provided with the interior chamber
20
″, which is designed analogous to the interior chamber
10
′ of the air nozzle
10
described above in connection with FIG.
5
. The interior chamber
20
″ of the bore
20
′ has a partial element
8
′ which, starting from the inlet side
8
, is embodied to be convergent, a nozzle throat
7
following it, as well as a partial element
9
′ adjoining the latter and oriented divergent in the direction of the outlet side
9
. Starting at the inlet side
8
, the convergent partial element
8
′ is provided in the direction toward the nozzle throat
7
, whose diameter is constricted, with a circular wall section
8
″ embodied in the shape of a segment of a circle.
The nozzle body
15
′ represented as a variation in
FIG. 6
, together with the bores
20
′ arranged in it and essentially embodied in a nozzle shape, can be made of a suitable plastic material, for example in an injection process, wherein the interior chamber
20
″ of the bores
20
′ has a completely smooth interior surface, which is fluidically optimal.
The air nozzle
10
, which is described above in connection with FIG.
5
and can be inserted into the nozzle body
15
in accordance with
FIG. 2
or
FIG. 7
, or respectively the bores
20
″ arranged in the nozzle body
15
′ and having the convergent and divergent partial elements
8
′,
9
′, essentially assure the pressure distribution as in a Laval nozzle, known per se. In this connection the air jet, which is expelled from the air nozzle
10
of the nozzle body
15
, or respectively from the correspondingly embodied bores
20
″ of the nozzle body
15
′, has a defined starting velocity (subsonic speed) in the convergent element
12
′ or
8
′, and therefore upstream of the respective nozzle throat
13
or
7
which, during passage through the nozzle throat
13
or
7
is appropriately increased (sonic speed) and is again accelerated in the divergent partial element
14
′ or
9
′ (supersonic speed).
FIG. 7
represents the second exemplary embodiment of the spray head
40
′ for the spray device
45
in accordance with
FIG. 1
on an enlarged scale and partially in section, and visible therein are the connecting housing
25
, which is fastened on the housing
41
by means of screws
39
, as well as the screwed-in nozzle body
15
with the air nozzles
10
arranged therein in the circumferential direction and distributed in relation to each other. Furthermore, a partial element of the guide sleeve
35
with the piston rod
43
seated coaxially therein, as well as an insertion element
50
, which is arranged in the nozzle body
15
and held by means of the compression-spring-loaded guide sleeve
35
, are also visible.
Different from the spray head
40
in accordance with
FIG. 2
, with the spray head
40
′ in accordance with
FIG. 7
a mouthpiece
60
embodied in a nozzle-shape is arranged is arranged on the outlet end of the insertion element
50
. For the exit of the delivered adhesive (not represented) in the form of the thin stream of spray
6
(FIG.
1
), the mouthpiece
60
is provided with an appropriately designed outlet opening
64
. In the exemplary embodiment in accordance with
FIG. 7
, the piston rod
43
on the conically tapered partial element
43
′ is provided with a tip
43
″, which can be inserted coaxially into the mouthpiece
60
and is shaped like a needle. Analogous to the description in connection with
FIG. 2
, the piston rod
43
can be displaced in the arrow direction X or X′, depending on how the not represented piston element is being acted upon.
FIG. 8
represents the mouthpiece
60
for the spray head
40
′, which is embodied in a nozzle shape and is shown on an enlarged scale and in section. The mouthpiece
60
has a first cylindrical partial element
60
′, as well as a second cylindrical partial element
60
″, whose diameter is set off. Viewed in the flow-through direction, the mouthpiece
60
is penetrated by several recesses
61
,
62
,
63
, each of which is oriented in a conically tapering manner in the direction toward the outlet opening
64
.
The insertion element
50
has a non-identified recess, which is designed to correspond to the exterior shape of the mouthpiece
60
, and in which the mouthpiece
60
is arranged, as represented in FIG.
7
. The mouthpiece
60
is preferably pressed into the recess of the insertion piece
50
.
The piston rod
43
with the conical partial element
43
′ formed thereon and the tip
43
″ formed on the latter, as well as the mouthpiece
60
are embodied in such a way that the outlet opening of the latter can be closed by the tip
43
″. In this case the tip
43
″ projects slightly (approximately by 0.2 mm) out of the outlet opening
64
, so that in this operating position there is no remaining amount of the adhesive left in the outlet opening
64
designed as a nozzle conduit. This design assures that the formation of drops (glue spots), which leads to malfunctioning of the machine, is prevented at the start of the application of glue to the product surface to be sprayed.
Claims
- 1. A method for applying an adhesive to a product surface wherein, by means of a spray head provided with a nozzle body, the adhesive is applied to the product surface to be sprayed as a thin stream of spray in the approximate shape of a spiral, on which at least one air jet acts at the outlet,characterized in that for the spiral-shaped delivery, as well as the application to the product surface, the thin stream of adhesive spray (6) exiting the spray head (40, 40′) is acted upon by at least one air jet, which has been accelerated by convergent-divergent means of the nozzle body (15, 15′).
- 2. The method in accordance with claim 1,characterized in that the air, which is delivered to the nozzle body (15, 15′) at an initial speed, is expelled in the form of an air jet, which has been sped up to sonic speed by means of the convergent-divergent means of the nozzle body (15, 15′), and accelerated to supersonic speed.
- 3. The method in accordance with claim 2,characterized in that for the purpose of a spiral-shaped application to the product surface, the thin stream of adhesive spray (6), which exits the spray head (40, 40′) in approximately a straight line, is acted upon by two or more air jets, which have been accelerated to supersonic speed.
- 4. The method in accordance with claim 3,characterized in that the thin stream of adhesive spray (6) is acted upon by one or several air jet(s), which has/have been accelerated to supersonic speed by the convergent-divergent means, and is/are directed on the exterior periphery of the spray (6).
- 5. A device for applying an adhesive in the form of a spiral-shaped thin stream of adhesive spray, having a housing embodied for receiving the adhesive delivered by a piston unit, having a spray head arranged thereon, which is connected with an air injection device and has a nozzle body, which is provided with bores, which are arranged distributed in respect to each other over the circumferential direction and are oriented obliquely in the direction of the exiting thin stream of spray, on which at least one air jet is to act,characterized in that for achieving an air jet, which is expelled in an accelerated manner and is directed onto the thin stream of adhesive spray (6), an air nozzle (10) with an interior chamber (10′), which is embodied convergent-divergent in the flow-through direction, can be respectively inserted into the bores (20, 20′), which can be charged with air via an associated air conduit (26), or that the interior chamber (20″), which is oriented in the flow-through direction, of the single bore (20′) is embodied to be convergent-divergent.
- 6. The device in accordance with claim 5,characterized in that the bores (20′), which are arranged in the nozzle body (15′) and penetrate it, respectively have an interior chamber (20′), which extends over their entire length and is embodied to be convergent-divergent.
- 7. The device in accordance with claim 6,characterized in that at a distance from the air inlet side (8), the interior chamber (20″) is provided with a nozzle throat (7), which constricts the interior chamber (20″) and, following this, with a partial element (9′), which is divergent at an acute angle (α) in the direction toward the outlet side (9).
- 8. The device in accordance with claim 7,characterized in that starting at the air inlet side (8), the convergently embodied partial element (8′) of the bore (20′) is provided in the direction toward the nozzle throat (7) with a wall section (8″), which is embodied in the shape of a segment of an arc.
- 9. The device in accordance with claim 8, wherein the nozzle body (15″), together with the bore (20″) arranged therein and respectively having a convergent-divergent interior chamber (20″), is made of a plastic material.
- 10. The device in accordance with claim 6,characterized in that the nozzle body (15″), together with the bores (20′) arranged therein and respectively having a convergent-divergent interior chamber (20″), is made of a suitable plastic material.
- 11. The device in accordance with claim 7, wherein the nozzle body (15″), together with the bore (20″) arranged therein and respectively having a convergent-divergent interior chamber (20″), is made of a plastic material.
- 12. The device in accordance with claim 5,characterized by a connecting housing (25) for receiving an insertion element (30, 50), provided with an outlet opening (34, 64) embodied as a nozzle conduit for the thin stream of adhesive spray (6), a guide sleeve (35), embodied for the coaxial seating of the piston rod (43), and the nozzle body (15, 15′), which is provided either with the air nozzles (10), which are distributed in the circumferential direction and respectively have a convergent-divergent interior chamber (10′), or with bores (20′), which are distributed in the circumferential direction and respectively have a convergent-divergent interior chamber (20″).
- 13. The device in accordance with claim 12,characterized in that with a cylindrical, as well as conically tapering partial element (32, 33) formed on it, the insertion element (30, 50) is arranged in analogously designed bores (19, 19′) of the nozzle body (15, 15′), and is arranged and held, coaxially centered, in the nozzle body (15, 15′) by means of the restoring force of a spring element (44) acting on the guide sleeve (35).
- 14. The device in accordance with claim 13,characterized in that a mouthpiece (60), which is provided with the outlet opening (64), is arranged in the insertion element (50) and has conically tapering recesses (61, 62, 63) arranged in sequence in the flow-through direction, for inserting the piston rod (43), which is provided at the front end with a needle-shaped tip (43″).
- 15. The device in accordance with claim 14,characterized in that the tip (43″), which is arranged on the conical partial element (43′) of the piston rod (43) and can be inserted into the outlet opening (64) of the mouthpiece (60) for closing it, is designed in such a way that in the inserted state the tip slightly projects out of the outlet opening (64) of the mouthpiece (60).
- 16. The device in accordance with claim 15,characterized in that the mouthpiece (60), which is provided with the outlet opening (64), is made of a suitable plastic material and pressed into the insertion element (50).
- 17. The device in accordance with claim 13,characterized in that for inserting the piston rod (43), which is provided with a conically tapering partial element (43′) at the front end, the insertion element (30) has a recess (34′), which is embodied to be conically tapering and is connected with the outlet opening (34).
- 18. The device in accordance with claim 12,characterized in that the nozzle body (15, 15′), which is provided with an exterior thread (17″), can be screwed into a recess (27), which is provided in the connecting housing (25) and is provided with an interior thread (27″) in such a way, that an annular conduit (26), which is embodied as a pressure chamber, is arranged between the rear (22′) of the nozzle body and the interior wall (26″) of the connecting housing (25) and is connected with a bore (26″), which penetrates the cylindrical partial element (25′) of the connecting housing (25) and delivers compressed air.
- 19. The device in accordance with claim 12,characterized in that the nozzle body (15, 15′) arranged in the connecting housing (25) can be adjusted in the axial direction relative to the outlet opening (34, 64) of the insertion element (30, 50).
- 20. The device in accordance with claim 5,characterized in that the single air nozzle (10) consists of a hollow-cylindrical small tube, whose interior chamber (10′) has, at a distance from the air inlet side (12), a nozzle throat (13), which constricts the interior chamber (10′) and, following this, a partial element (14′), which is divergently embodied at an acute angle (α) in the direction toward the outlet side (14).
- 21. The device in accordance with claim 20, wherein the interior chamber (10′) of the air nozzle (10) is provided with a partial element (12′), which is embodied convergent in the direction of the air inlet side (12), and comprises a wall section (12″), which is oriented in a direction toward the nozzle throat (13) in the shape of a segment of a circle.
- 22. The device in accordance with claim 21, wherein the air nozzle (10), respectively arranged in the bore (20) of the nozzle body (15), is arranged axially adjustable in the bore (20) in relation to a thin stream of adhesive spray (6) coming out of the outlet opening (34) of the insertion element (30).
- 23. The device in accordance with claim 20, wherein the air nozzle (10), respectively arranged in the bore (20) of the nozzle body (15), is arranged axially adjustable in the bore (20) in relation to a thin stream of adhesive spray (6) coming out of the outlet opening (34) of the insertion element (30).
- 24. The device in accordance with claim 5,characterized in that the interior chamber (10′) of the air nozzle (10) is provided with a partial element (12′), which is embodied convergent in the direction of the air inlet side (12), which is designed as a wall section (12″), which is oriented in the direction toward the nozzle throat (13) and is designed in the shape of a segment of a circle.
- 25. The device in accordance with claim 24, wherein the air nozzle (10), respectively arranged in the bore (20) of the nozzle body (15), is arranged axially adjustable in the bore (20) in relation to a thin stream of adhesive spray (6) coming out of the outlet opening (34) of the insertion element (30).
- 26. The device in accordance with claim 5,characterized in that the air nozzle (10), respectively arranged in the bore (20) of the nozzle body (15), is arranged axially adjustable in the bore (20) in relation to the thin stream of adhesive spray (6) coming out of the outlet opening (34) of the insertion element (30).
Priority Claims (1)
Number |
Date |
Country |
Kind |
1815/98 |
Sep 1998 |
CH |
|
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
9404282 |
Mar 1994 |
WO |