US 2010/0247357 A1Published application

Device comprising a combination of a chamber and a piston

OwnerNicolaas Van der Blominventor

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Abstract

The object of the invention is to provide a reliable and inexpensive combination of a chamber and a piston to be used in any device where such a combination is needed so that it comply with specific demands towards the operation force for e.g. pumps, specifically manually operated pumps. By a device comprising a chamber and a piston positioned inside the chamber said chamber and said piston relatively movable to each other in a predetermined direction of movement between a first position and a second position of which the cross-section of the chamber in a plane perpendicular to the direction of movement is larger at the first position than at the second position, the change in the cross section of the chamber is essentially continuous between the first position and the second position and the cross-section of the piston in a plane perpendicular to the direction of movement is arranged to adapt itself to the cross-section of the chamber. It is further possible that the piston has a fixed geometrical shape, that the wall of the chamber has different sizes of cross-sections in the direction of the movement and is arranged to adapt itself to the piston. Moreover, both the piston and the and the wall of the chamber can adapt itself to each other.

Claims24

Dependent claims

A piston-chamber combination comprising an elongate chamber which is bounded by an inner chamber wall and comprising a piston in said chamber to be sealingly movable relative to said chamber at least between first and second longitudinal positions of said chamber, said chamber having cross-sections of different cross-sectional areas at the first and second longitudinal positions of said chamber and at least substantially continuously differing cross-sectional areas at intermediate longitudinal positions between the first and second longitudinal positions thereof, the cross-sectional area at the first longitudinal position being larger than the cross-sectional area at the second longitudinal position,

said piston being designed to adapt itself and said sealing means to said different cross-sectional areas of said chamber during the relative movements of said piston means from the first longitudinal position through said intermediate longitudinal positions to the second longitudinal position of said chamber, wherein
the piston comprises:
a plurality of at least substantially stiff support members rotatably fastened to a common member,
elastically deformable means, supported by the supporting members, for sealing against an inner wall of the chamber
the support members being rotatable between 10° and 40° relative to the longitudinal axis.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/461,168Filed 3 Aug 2009
Priority: 24 May 2002
Published: 30 Sep 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

F04B 39/0005
Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of…:…
F04B 33/005
Pumps actuated by muscle power, e.g. for inflating: specially adapted for inflating tyres of non-motorised vehicles, e.g. cycles, tricycles
F04B 39/0022
Adaptations of pistons: piston rods
F04B 53/143
Pistons, piston-rods or piston-rod connections: sealing provided on the piston

Family

Application10/009,446Continuation · filed 24 May 2002
Application11/040,118Continuation · filed 24 Jan 2005
Application12/314,376Continuation · filed 9 Dec 2008
Application12/461,168Continuation
US 2008/0006147 A1Published application
US 7,461,582 B2Related patent
US 2010/0247357 A1This patent

From the US filing history. Foreign family members aren’t listed.