Dispensing – With lock or fastening seal – Inhibiting disassembly
Reexamination Certificate
2000-10-13
2001-08-28
Derakshani, Philippe (Department: 3754)
Dispensing
With lock or fastening seal
Inhibiting disassembly
C222S400700
Reexamination Certificate
active
06279782
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention pertains generally to pressurized containers and the bleeding of pressure prior to container opening.
In the field of dentistry, it is accepted practice to rinse the patient's mouth at intervals. While tap water is used for such rinsing, it is preferable to use distilled water or a rinse made specifically for such a purpose. In such a case, the rinse liquid is contained in a bottle or other container adjacent the dental chair and supplied with modest air pressure to provide a pressurized flow to the dental syringe. Such a practice of providing a rinse from a pressurized bottle or other container incurs the task of frequently having to refill the bottle with liquid, which requires the pressure being bled prior to opening. To do so without careful venting can result in a somewhat dynamic separation of the container from its closure. Should a supply of rinse be exhausted during patient treatment the assistant, in haste to refill the bottle, may fail to open the rinse container or bottle in a slow, controlled manner, resulting in some risk. The use of a bleed valve requires an additional task of the assistant, and is not practical in that they may be overlooked in a busy environment.
SUMMARY OF THE PRESENT INVENTION
The present invention concerns the provision of a pressurized liquid container with a quick connect system which automatically bleeds off pressure during opening of the container.
In a dental office, a container for a rinse liquid may be located adjacent a dental chair or station and is in communication with a hand held three-way syringe and dental handpieces operated by the dentist or assistant. The rinse quantity may not be checked, in view of the container being somewhat out of the field of vision.
The present system includes a cap having a seal which seats against an annular wall located within a neck component of the container. The neck component and cap share a modified bayonet type lock. Axial movement occurring between the cap and neck component during locking and unlocking of the neck component automatically seals and unseals the cap to neck component.
Important objectives of this system include the provision of a pressurized container that automatically bleeds off pressure during unlocking a container and prior to separation of the container from its cap or closure; the provision of a pressurized container utilizing a bayonet type lock to secure the container to its cap and having inclined channels which act on bayonet type locking pins to impart relative axial movement between cap and the container neck to unseat a seal, permitting safe bleeding off of container pressure prior to bayonet lock separation; the provision of a cap type closure for a pressurized container or bottle with a stem having bayonet lock type pins or arms which ride in channels in a neck of the container, inclined to the container major axis, to impart axial displacement of a seal away from sealing engagement with the neck to vent the container; the provision of a pressurized container for a dental rinse liquid having a closure and neck portion which automatically bleed container pressure prior to separation to avoid dynamic separation and risk of injury.
REFERENCES:
patent: Re. 29405 (1977-09-01), Gunzel, Jr. et al.
patent: 5836483 (1998-11-01), Disel
Dental Components, Inc.
Derakshani Philippe
Givnan, Jr. James D.
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