Receptacles – Receptacle having flexible – removable inner liner – Paint receptacle
Reexamination Certificate
2001-02-26
2001-11-20
Moy, Joseph M. (Department: 3727)
Receptacles
Receptacle having flexible, removable inner liner
Paint receptacle
C220S570000, C220S495010, C220S695000, C101S425000
Reexamination Certificate
active
06318580
ABSTRACT:
TECHNICAL FIELD
This invention relates to a waste catchment system for rollers, and has particular, though not exclusive, application to such a system for collecting waste liquids, inks or print-related substances from rollers used in the printing industry.
BACKGROUND ART
It is conventional practice in the printing industry to remove waste liquids, inks or print-related substances from rollers using a blade of rubber or similar material the edge of which engages with the rotating roller to scrape the surplus material from the roller, the waste material then being directed into a wash-up tray.
The wash-up trays need to be cleaned regularly, and this can be a messy and time-consuming exercise which can result in undesirable exposure to, and contact with, printing waste and chemicals.
It has therefore been proposed, for example as disclosed in WO94/19193 and DE-U-92 00 319, to provide the wash-up tray with a liner which protects the wash-up tray and retains the waste material therein. On completion of the roller cleaning process, the liner and waste material are removed from the wash-up tray and are disposed of, a replacement liner then being inserted into the wash-up tray for subsequent collection purposes.
Conventionally, the liners were releasably attached to the blades by means of double sided adhesive tape. However, such an arrangement suffers from a number of disadvantages not the least of which is that, being prone to contact by chemicals, in particular solvents, the tape is liable to be degraded by the waste materials and to lose its adhesion, whereby the liner can become displaced from its operative position during the cleaning process.
It has been proposed, for example as disclosed in DE-U-8903674, to provide a thickened upper edge to the liner which is received in a slot formed in the lower regions of the blade to interconnect the liner and the blade. Such an arrangement simplifies attachment of the liner to, and release of the liner from, the blade.
However, there are still problems associated with removal of the liner from the tray when full of waste material because of the fluid nature of the waste material.
SUMMARY OF THE INVENTION
It would be desirable to be able to provide a waste catchment system for a roller in which waste material is scraped from the roller by a blade and is directed into a wash-up tray containing a removable liner, in which the means for attaching the liner to the blade are such as to eliminate the use of double-sided adhesive tape for said attachment, and which overcomes the problems associated with removal of the liner from the tray.
According to the present invention there is provided a waste catchment system for a roller comprising an elongate tray, a blade assembly attached to, to extend the length of, the tray and including a blade located above the tray the free edge of which is adapted to engage with a roller to be cleaned whereby waste material from the roller is removed therefrom by the blade and is directed towards the tray, and a liner one edge of which is attached to the blade assembly whereby the liner lines the tray to receive therein the waste material, the blade assembly and the one edge of the liner being provided with co-operating male/female elements which are a friction push-fit one into the other to effect a releasable sealing connection therebetween, characterised by, between the liner and the tray, a removable rigid support element the transverse section of which conforms substantially with that of the tray and the liner, the support element receiving therein the liner to facilitate removal of the liner from the tray.
It will be appreciated that the mechanical leakproof coupling effected between the liner and the blade assembly is not prone to attack by the content of the waste material, and therefore remains in a positive operative position throughout the roller cleaning process and regardless of the chemical nature of the waste material, while the presence of the rigid support element facilitates removal of the liner from the tray when the liner contains waste material.
In a preferred embodiment of the invention, the male element is provided on the liner, and the female element is provided in the blade assembly, more preferably in the blade.
The male element may comprise a bead, preferably of circular transverse section, extending the length of the one edge of the liner, the female element comprising an elongate groove of corresponding transverse section extending the length of the blade assembly.
Alternatively, the male element may comprise a tenon extending the length of the one edge of the liner, the female element comprising an elongate mortise of corresponding section extending the length of the blade assembly.
Conveniently a release mechanism, for example a pull strip, is provided at one end of the male/female connection to initiate release of the male element from the female element.
In order to minimise movement of liquid waste material in the liner, the waste chatchment system may include a plurality of longitudinally spaced baffle plates within the liner each extending transversely of the liner.
REFERENCES:
patent: 4165965 (1979-08-01), Bernardelli et al.
patent: 4928843 (1990-05-01), Gnderson
patent: 5259313 (1993-11-01), Gibson et al.
patent: 5271326 (1993-12-01), Ebina
patent: 5385095 (1995-01-01), Waizmann
patent: 5549216 (1996-08-01), Scholl
patent: 5746346 (1998-05-01), Crilly
patent: 8903674 U (1989-08-01), None
patent: 0022459A (1982-08-01), None
patent: 0414909A (1991-06-01), None
patent: 0590833A (1994-04-01), None
Gary Williamson
Larson & Taylor PLC
Moy Joseph M.
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