Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1998-04-29
1999-11-30
Paschall, Mark
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
F04B 3910
Patent
active
059931809
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a pump suited for dispensing a fluid in a personal care appliance, comprising pump chamber,
The invention further relates to an assembly of a holder for holding a fluid and such a pump.
The invention also relates to an appliance for personal body care including a treatment device for carrying out a body-care treatment under the influence of a fluid, which appliance includes a pump for applying the fluid.
Moreover, the invention relates to a method of assembling such a pump.
BACKGROUND OF THE INVENTION
Such a pump and such an appliance are known from EP-A-0 463 992. The known appliance is a shaver having a holder with a shaving liquid and a pump for pumping the shaving liquid from the holder to a discharge opening of the shaver. The known pump comprises a central tubular element around which a bellows is arranged, an inlet valve being arranged at one end of the tubular element and an outlet valve being arranged at the other end of this element. A drawback of the known pump is that it comprises a comparatively large number of parts. Another drawback is that the dimensions of the pump are large in relation to the corresponding dimensions of the appliance and the holder.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a pump which can be manufactured at very low cost. To this end the pump in accordance with the invention is characterized in that channel and the outlet channel terminate, between the wall portion and an intermediate part, correspond to the inlet channel and the outlet channel, and intermediate part. simple parts onto one another. Since the parts are simple they can each be manufactured at low cost. Since the number of parts is small in comparison with the number of parts of the known pump and since the parts can be stacked in a simple manner the total material costs and the assembly costs are substantially lower than in the case of the known pump. Another advantage of the pump in accordance with the invention is that the pump has a substantially smaller overall height than the known pump. As a result of this, the pump in accordance with the invention can be accommodated easily in a personal body care appliance, such as for example a shaver.
An embodiment of the pump in accordance with the invention has the characteristic features that the movable wall comprises a flexible material. As a result, a pump chamber having a variable volume is obtained in a simple manner. Thus, the volume of the pump chamber will decrease in response to a force acting on the movable wall in the direction of the intermediate part and the volume of the pump chamber will increase again under the influence of the flexibility of the end part when this force is reduced.
An embodiment of the pump in accordance with the invention has the characteristic features that the basic part one or more projections for clamping the end part onto the basic part. As a result a stack comprising the basic part, the valve foil, the intermediate part and the end part can be locked up easily. Clamping also results in a proper sealing between the intermediate part and the end part.
An embodiment of the pump in accordance with the invention has the characteristic features wherein the end part has been provided with a rigid mounting ring. A rigid mounting ring makes the end part easier to handle during assembly of the pump and enables the end part to be secured to the basic part in a better and easier manner, for example the mounting ring is snapped in position behind some projections on the basic part. Such an end piece can be manufactured by means of a two-component injection-molding process.
An embodiment of the pump in accordance with the invention has the characteristic features wherein the mounting ring comprises polypropylene (PP) and the flexible material comprises a styrene ethylene butylene styrene (SEBS) elastomer. These measures ensure a proper adhesion between the mounting ring and the flexible portion of the end part. Alternatively, it is possible to use mate
REFERENCES:
patent: 4228587 (1980-10-01), Bennett
patent: 4417397 (1983-11-01), Kitamura
patent: 5016351 (1991-05-01), Drahus
patent: 5044425 (1991-09-01), Tatsumi et al.
patent: 5168628 (1992-12-01), Mock et al.
patent: 5402697 (1995-04-01), Brooks
patent: 5564190 (1996-10-01), Fleetwood
patent: 5673485 (1997-10-01), Hill
Pezij Lambertus J.
Westerhof Willem A.
Bartlett Ernestine C.
Paschall Mark
Patel Vinod D.
U.S. Philips Corporation
LandOfFree
Pump, pump and holder assembly, personal-care appliance, and met does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pump, pump and holder assembly, personal-care appliance, and met, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pump, pump and holder assembly, personal-care appliance, and met will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1664500