Dispensing – With cutter and/or punch – To form dispensing opening in container
Reexamination Certificate
2000-06-30
2001-10-09
Shaver, Kevin (Department: 3754)
Dispensing
With cutter and/or punch
To form dispensing opening in container
C222S326000, C222S386000, C222S095000, C222S105000
Reexamination Certificate
active
06299022
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a film packing for a pasty substance, in particular an adhesive, sealing and/or forming masses or other age-hardening substances.
Pasty substances are normally marketed in disposable packings which are inserted into application devices such that they can be applied. In some cases the disposable packings are configured as rigid cartridges having a movable bottom which is moved, like a piston, into the cylindrical housing of the cartridge to discharge the pasty substance. Due to the relatively large amount of packing material to be disposed of, flexible disposable packings in the form of film tube bags are frequently used. Said film tube packings are made of a metal or plastic film tube which is tied together by clips at its two ends. Such a film tube bag is inserted into the cylindrical chamber of an applicator which comprises an outlet piece at one end of the cylindrical chamber. A stamp-type plate of the applicator is moved into the other end of the cylindrical chamber, which plate exerts a pressure onto the film tube bag and the pasty substance contained therein so that said substance is discharged through a passage opening in the end of the film tube bag facing the outlet piece and leaves the applicator through said outlet piece. Film packings of the type described above are e.g. known from DE-U-296 17 654, DE-U-296 13 945, EP-A-0 863 088 and EP-A-0 653 362.
The known film tube packings have substantially proved successful in practical applications. However, the process of opening the film tube packings is still in need of improvement. A known procedure is to use piercing pins or spikes for this purpose, which pierce the film tube when the latter is inserted. The film tube and the receiving headpiece with the piercing pin and the outlet piece receiving the former must be assembled for the purpose of opening the film tube, which impedes the handling and is considered a nuisance.
It is an object of the invention to provide a film tube packing which is easier to open by means of a piercing pin.
SUMMARY OF THE INVENTION
This object is solved according to the invention by means of a film packing for a pasty substance comprises a film tube bag having a peripheral wall and two ends, and a cover portion fastened to one of the two ends of the film tube bag. The cover portion comprises an end face having a passage opening for the passage of pasty substance from the opened film tube bag, a peripheral face joining the end face, and a sealing element abutting to a receiving headpiece attachable to the end of the film tube bag carrying the cover portion. The receiving headpiece surrounds at least the end face and the peripheral face of the cover portion and comprises an outlet piece which is in fluid connection with the passage opening of the cover portion when the receiving headpiece is attached. In a first position in which the piercing pin is arranged at a distance from the film tube bag, the cover portion is locked to the receiving headpiece for securing against unintended movement of the film tube bag farther into the receiving headpiece. Upon deactivation of the locking device, the cover portion (
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) can be moved from this position into a second position in which the piercing pin penetrates the film tube bag.
The locking device according to the invention allows the film tube bag to be locked via its cover element to the receiving headpiece in a preliminary position in which the piercing pin arranged on the receiving headpiece has not yet pierced the film tube bag. Only by moving the film tube bag, which is in particular snappingly held by the receiving headpiece, further into the receiving headpiece is in the film tube packing pierced. In this position, too, the cover element of the film tube bag is preferably locked to the receiving headpiece. The locking device arranged between receiving headpiece and film tube bag offers, in the preliminary position, the advantage that the two parts can be delivered together and that the user opens the film tube bag by a defined movement of the two parts. This is appropriate in particular when both the receiving headpiece and the film tube bag are configured as disposable articles.
The locking device between receiving headpiece and cover portion is preferably realized by elements optionally being adapted to be disengaged and appropriately configured as snapping device. Said snapping device comprises in particular complementary snapping projections and snap-in recesses arranged on the cover portion and the receiving headpiece. Said snapping projections and snap-in recesses are attached to e.g. elastic studs in particular of the cover portion. Generally such an elastic stud is sufficient; for reasons of ease of handling it is, however, appropriate to provide two studs arranged diametrically opposite each other on the cover portion. Said studs extend transversely to the end face of the cover portion and are accessible from outside when the cover portion can be released from the receiving headpiece when a force is applied from outside on the at least one stud.
In an alternative embodiment of the invention the locking device is configured as a connection having a weakening line. The connection between cover portion and receiving headpiece in the first position (preliminary position) can thus be released e.g. by a breakable release portion (e.g. breaking ring) so that the cover portion can then be shifted in the direction of the second position into the receiving head position.
The connection with the weakening line offers the advantage that the holding fixture of the cover portion on the receiving headpiece can be configured in such a stable and durable manner that during transport of the preassembled unit of receiving headpiece and film tube bag including the cover portion the cover portion does not separate from the receiving headpiece and assume the second position. Thus a special transport protective means is not required.
Further the locking device offers the advantage that the cover portion is adapted to be connected with the receiving headpiece to protect the cover portion against unintentional releasing from the receiving headpiece. This specific manner of locking of the cover portion to the receiving headpiece facilitates removal of a film tube bag from the applicator. Without this temporary connection the receiving headpiece would be taken out of the pressure chamber of the applicator with the film tube bag and its cover portion remaining in the cylindrical pressure chamber. To remove the film tube bag from the cylindrical pressure chamber the cover portion would have to be grasped by hand and the film tube thus pulled out of the pressure chamber. It is however easier to take the film tube bag out of the pressure chamber by grasping the receiving headpiece. This is realized according to the invention by the locking device between cover portion and receiving headpiece.
Alternative embodiments of the locking device are a bayonet catch or a thread. Besides a releasable positive locking the locking device may be realized by a releasable non-positive locking configured as frictional connection.
To facilitate movement of the cover portion with the film tube bag from the preliminary position to the final position on the receiving headpiece it is advantageous when the snapping action does not present too large a resistance. However this is disadvantageous to a certain degree during the transport of the film tube bag preliminarily positioned on the receiving headpiece. During the transport care should be taken that the film tube bag does not accidentally move from the preliminary position in the direction of the final position and further into the receiving headpiece since this would result in an unintentional opening of the film tube bag and thus discharge of the material contained therein.
To solve the aforementioned problem it is proposed, according to an alternative embodiment of the present invention, to employ a film tube packing where, according to the invention, a stopping element is ar
Bublewitz Alexander
Suchan Matthias
Buechner Patrick
Diller Ramik & Wight
Kettenbach GmbH & Co. KG
Shaver Kevin
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