Dispensing – Processes of dispensing
Reexamination Certificate
1999-07-19
2001-05-22
Kaufman, Joseph A. (Department: 3754)
Dispensing
Processes of dispensing
C222S327000, C222S391000
Reexamination Certificate
active
06234348
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an extruding mechanism for tubular bags, which is used for extruding contents, such as a sealing material agent or the like, from a tubular bag that packages with a film a largely tacky material, such as the sealing material, the adhesive agent or the like used mainly for construction or the like, and a method of extruding the contents from the tubular bags.
BACKGROUND ART
As shown in
FIG. 52
, a conventional extruding gun
10
a
used for extruding a sealing material or the like from a tubular bag includes an extruding rod
28
having a pressing plate
42
at its leading end, a main body portion
14
which moves forward the extruding rod
28
by the action of a hand-operated means such as a lever
22
, (or an electric-powered means), a tubular cylinder
16
a
which is removably mounted on the front side of the main body
14
, and a nozzle
98
which is removably mounted on the leading end of the cylinder
16
a
via a nozzle mounting cap
96
The extruding gun
10
a
is designed such that a tubular bag accommodated within the cylinder
16
a
is pressed by the pressing plate
42
being moved forward along with the pressing rod
28
so that the sealing material or the like filled in the tubular bag is extruded from the nozzle
98
. This conventional type of the extruding gun is disclosed, for instance, in Japanese Patent Laid-Open Publication Nos. 4-279458, 5-301064, etc.
This conventional extruding gun
10
a
for the tubular bag is used in the following manner. First of all, the nozzle
98
is removed from the cylinder
16
a
. The tubular bag is inserted into the cylinder
16
a
through the leading end portion of the cylinder
16
a
in a state that the extruding rod
28
is pulled rearward of the main body portion. After the leading end of the tubular bag is opened with scissors or the like, the nozzle
98
is mounted on the cylinder
16
a
. The setting of the tubular bag to the extruding gun
10
a
is completed in this manner.
With the operation of the lever
22
of the main body portion
24
, the extruding rod
28
is moved forward so that the pressing plate
42
mounted on the leading end of the extruding rod
28
presses the sealing material or the like together with the tubular bag, whereby the sealing material or the like filled in the tubular bag is extruded from the nozzle
98
.
This extruding gun
10
a
requires the installation of the tubular cylinder
16
a
, and thus has a disadvantage of an increased cost in comparison with an extruding gun described later in which a holding base is installed. Further, in this extruding gun
10
a
, when the extruding rod
28
is moved forward to press the tubular bag with the pressing plate
42
, the film of the tubular bag may be bitten and clogged into a space between the inner wall of the cylinder
16
a
and the outer circumferential surface of the pressing plate
42
. This biting of the film leads disadvantageously to the heavy and sluggish movement of the extruding rod
28
(see Japanese Patent Laid-Open Publication Nos. 4-271864~5).
An extruding mechanism associated with the extruding rod
28
in the extruding gun
10
a
is the same as that in an extruding gun
10
described later, and thus a detailed explanation therefor is omitted here.
As means for containing the sealing material, the adhesive agent or the like, a hard cartridge container is used other than the above-noted soft tubular bag. As shown in
FIG. 53
, the cartridge container
100
is constructed by a cylindrical container main body
104
and an extruding nozzle
106
which are integrally formed together. A slidable piston
102
is disposed within the cylindrical container main body
104
. This cartridge container
100
is designed such that forward movement of the extruding rod
28
of the extruding gun
10
leads forcibly to forward movement of the piston
102
so that contents C, such as a sealing material, are extruded or discharged from the extruding nozzle
106
. The extruding gun
10
, which is used for extruding the contents C, such as the sealing material, in this cartridge container
100
, only requires the installation of a semi-cylindrical holding base
16
instead of the cylindrical cylinder
16
a
that is required as an essential element in the extruding gun
10
a
for the tubular bag, since the sealing material or the like has been already filled in the hard cartridge container
100
and thus need not to use the tubular cylinder
16
a
. Accordingly, the manufacture of the extruding gun
10
is effected more easily and has an advantage of reduction in cost in comparison with the manufacture of the extruding gun
10
a.
However, as a matter of course, the extruding gun
10
for the cartridge container
100
can not be used as an extruding gun for a tubular bag. Hence, under the present state of the art, the extruding gun
10
a
for the tubular bag and the extruding gun
10
for the cartridge container are manufactured and used individually.
For example, in a case where an extruding gun for a cartridge container has already been purchased and possessed, an extruding gun for a tubular bag must be newly purchased if the sealing material or the like in the form of the tubular bag is used.
Further, in a case where both of the film container and the tubular bag are to be used in a job site using the sealing material or the like, one kind of the extruding gun is insufficient and both of the extruding guns for the cartridge container as well as for the tubular bag must be carried to the job site.
On the other hand, in a case of the cartridge container
100
, if the piston
102
is moved from one end to the other end and thus all of the sealing material or the like filled therein is discharged and used up, the empty container is discarded as it is. In a case of the tubular bag, if all of the sealing material or the like filled therein is discharged, the tubular bag is in a squashed state, and then discarded in this state.
Upon comparing the tubular bag with the cartridge container, the manufacturing cost of the tubular bag is lower than that of the cartridge container, and with respect to waste disposal, the cartridge container is bulky, whereas the tubular bag is convenient from the viewpoints of transportation and processing since the tubular bag is compactly squashed. The environmental contamination due to discarded wastes is a current world-wide problem. The amount of the discarded wastes of the tubular bags is remarkably smaller than that of the cartridge container, and thus the tubular bag is preferable from this point.
As noted above, the tubular bag is inexpensive, and advantageous from the viewpoint of the disposal thereof in comparison with the cartridge container, but the problem resides in that the tubular bag requires a special type of the extruding gun for extruding the contents from the tubular bag.
In view of the above-noted problems, the present applicant already proposed an extruding mechanism for a tubular bag and a method of extruding contents in a tubular bag, which enable the effective use of the tubular bag with a usual extruding gun for a cartridge container instead of the special type of the extruding gun (Japanese Patent Lain-Open Publication No. 9-314012).
In the above proposal, there remains room for improvement with respect to a mechanism for picking up and discarding a squashed and used up tubular bag, a mechanism for removably mounting a cylinder body inside of which the tubular bag is accommodated onto a holding base of an extruding gun and so on. Upon continuously studying with respect to these mechanisms, the present inventors have newly proposed improved mechanisms.
On the other hand, as shown in
FIG. 54
, an extruding mechanism for a tubular bag is known, which includes (a) an extruding gun
10
having a holding base
16
, a stationary holding plate
46
disposed on the front end portion of the holding base
16
, and an extruding rod provided at its leading end with a pressing plate
42
and arranged movably back and forth on the holding base
16
, (b) a cylindrical member
Matsuo Kenji
Nimura Akio
Nishikawa Nobuyoshi
Okamura Naomi
Omura Hironobu
Arent Fox Kintner & Plotkin & Kahn, PLLC
Cemedine Co. Ltd.
Kaufman Joseph A.
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