초록 ▼

The present invention provides an assembly of bellows part and a part against which unrolling takes place (the unrolling part), comprising a bellows part with a flexible wall of a predetermined shape and thickness variation which co-operates with an unrolling part with a stiff outer wall along which

The present invention provides an assembly of bellows part and a part against which unrolling takes place (the unrolling part), comprising a bellows part with a flexible wall of a predetermined shape and thickness variation which co-operates with an unrolling part with a stiff outer wall along which the flexible wall is movable, wherein the unrolling part has a predetermined diameter variation and/or the flexible wall has a predetermined thickness variation so as to cause a desired development of force.

대표청구항 ▼

The invention claimed is: 1. An assembly, comprising: a bellows part, comprising: a flexible wall; a thickened base at one end of the flexible wall; a turned-back edge at an opposite end of the flexible wall; a cylindrical pressure valve adjacent the thickened base at one end of the flexible wall;

The invention claimed is: 1. An assembly, comprising: a bellows part, comprising: a flexible wall; a thickened base at one end of the flexible wall; a turned-back edge at an opposite end of the flexible wall; a cylindrical pressure valve adjacent the thickened base at one end of the flexible wall; and a suction valve adjacent to and encircled by the turned-back edge; a co-acting part, comprising: a top portion; and a conical outer wall, comprising: a concave first conical part; and a second conical part; wherein the turned-back edge of the bellows part rests on the top portion of the co-acting part and the bellows part co-operates with the co-acting part. 2. The assembly of claim 1, wherein a thickness of the flexible wall adjacent the thickened base is greater than the thickness of flexible wall adjacent the turned-back edge so as to cause a desired development of force. 3. The assembly of claim 1, wherein the turned-back edge is arranged on an outer end thereof for the purpose of absorbing a pressure force. 4. The assembly of claim 1, wherein the flexible wall further comprises a thickened portion. 5. The assembly of claim 1, wherein the flexible wall further comprises a bend. 6. The assembly of claim 1, wherein the flexible wall further comprises a concave cross-section. 7. The assembly of claim 1, wherein the flexible wall further comprises a convex cross-section. 8. The assembly of claim 1, wherein the bellows part comprises a material selected from the group consisting of a thermoplastic polymer and an elastomer. 9. The assembly of claim 1, wherein the flexible wall of the bellows part is substantially cylindrical. 10. The assembly of claim 1, wherein the suction valve further comprises three legs connected to the turned-back edge. 11. The assembly of claim 10, wherein the legs are Z-shaped in top view for an improved spring action. 12. The assembly of claim 1, wherein the suction valve further comprises a guide protrusion. 13. The assembly of claim 1, wherein the cylindrical pressure valve comprises a cylindrical flexible wall. 14. A pump, comprising an assembly as recited in claim 1. 15. A method for using an assembly as recited in claim 1, comprising rolling and unrolling the bellows part over at least a portion of the co-acting part. 16. The assembly of claim 1, wherein the turned-back edge further comprises a thickened edge and wherein the thickened edge rests on the top portion of the co-acting part. 17. An assembly, comprising: a bellows part, comprising: a flexible wall; a thickened base at one end of the flexible wall; a turned-back edge at an opposite end of the flexible wall; a cylindrical pressure valve adjacent the thickened base at one end of the flexible wall; and a suction valve adjacent to and encircled by the turned-back edge; a co-acting part, comprising: a top portion; and a conical outer wall, comprising: a convex first conical part; and a second conical part; wherein the turned-back edge of the bellows part rests on the top portion of the co-acting part and the bellows part co-operates with the co-acting part. 18. The assembly of claim 17, wherein a thickness of the flexible wall adjacent the thickened base is greater than the thickness of flexible wall adjacent the turned-back edge so as to cause a desired development of force. 19. The assembly of claim 17, wherein the flexible wall further comprises a thickened portion. 20. The assembly of claim 17, wherein the turned-back edge further comprises a thickened edge and wherein the thickened edge rests on the top portion of the co-acting part.