Dispensing – With cutter and/or punch – To form dispensing opening in container
Patent
1981-12-30
1984-06-12
Rolla, Joseph J.
Dispensing
With cutter and/or punch
To form dispensing opening in container
222 83, 222389, 401264, B67B 728
Patent
active
044536518
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to cartridge assemblies and has particular reference to a cartridge assembly containing a fluent substance, such as for example a mastic, to be dispensed. Such an assembly can be used with a dispenser which is operable to expel the substance from the cartridge.
BACKGROUND OF THE INVENTION
Such cartridge assemblies are known which comprise an elongate chamber containing a fluent substance with an outlet at one end and a piston at the other end. The outlet is commonly defined by an externally screw threaded hollow boss onto which in use a nozzle is screwed and which out of use is closed by a cap screwed onto the boss. In order to expel the fluent substance from the cartridge the piston is pushed towards the front of the cartridge.
With an arrangement of this kind it is not possible to control well the flow of substance from the cartridge.
In order to improve the control of the flow, the dispenser could be provided with a control valve between the cartridge and the nozzle outlet. However, if such a control valve were provided the valve would require cleaning each time the dispenser was used which would be a serious disadvantage to the user.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved form of cartridge assembly.
According to the invention a cartridge assembly for a fluent substance dispenser includes a cartridge having an elongate chamber containing a fluent substance to be dispensed by means acting from one end of the chamber, the other end of the chamber being provided with means defining an outlet for the fluent substance, and a valve member mounted inside the cartridge over the inside of the outlet defining means and movable away from a closed position to an open position by pressure exerted against the valve member from outside cartridge.
Although the provision of a valve member in a cartridge assembly might seem an extravagance since once the cartridge is empty the assembly is thrown away, it is, on the contrary, advantageous. There is no cleaning of the valve member and therefore, if the nozzle used to dispense the substance is thrown away, there need be no cleaning of any part of the apparatus, which is highly advantageous to the user. Actuation of the valve member, by pressing against the valve member from outside the cartridge, is a very simple method of actuation which enables the dispenser and cartridge assembly to be of simple construction.
Said means acting from one end of the chamber may comprise a piston mounted at one end of the chamber for movement along the chamber.
The valve member may comprise a disc forming a part of a valve assembly, the valve assembly including mounting means for mounting the valve assembly in the cartridge. This valve assembly may be made in one piece with the valve member and the mounting means being integral. This enables the valve assembly to be made particularly cheaply which is an important consideration when the cartridge assembly is to be thrown away once the cartridge is empty.
The valve assembly may also include a plurality of webs extending between the valve member and the mounting means. The mounting means may be press fitted in the cartridge. This provides a very simple method of locating the valve assembly in the cartridge.
The outlet defining means may comprise an aperture in the cartridge. Alternatively the outlet defining means may comprise a portion of the wall of the cartridge which is weakened; for example, the outlet defining means may comprise an aperture in the cartridge covered over by foil which can be removed by a user to produce an aperture.
A cylindrical boss may be provided on the exterior of the cartridge around the outlet defining means, the boss having a bore therethrough aligned with the outlet defining means.
A resilient stopper may be provided for insertion into the bore of the boss. The exterior of the boss may be screw-threaded and screw-threaded securing means may be provided for engaging the screw-threaded boss to retain the stopper in the bor
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Braithwaite John D.
King Derrick O.
Williams Sidney J.
Berger, Jenson and Nicholson Limited
Black & Decker Inc.
Huppert Michael S.
Murphy Edward D.
Rolla Joseph J.
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