Suction tube for a vacuum cleaner
OwnerYuqi Zhanginventor
Life of this patent
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Abstract
The present invention provides a suction tube for a vacuum cleaner, which comprises an outer pipe (8), an inner pipe (1) received in the outer pipe, and a locking device (20) disposed between the inner pipe (1) and the outer pipe (8). A guiding bush (2) is provided at the inner wall of the outer pipe (8). The inner pipe (1) is provided with a row of detent holes (9) which are arranged in the axial direction of the inner pipe (1). An inner liner tube (12) is fixed onto the inner wall of the inner pipe (1). Thus, the manufacturing of the detent recesses becomes easier since the detent holes are made through the inner wall of the inner pipe, and the air leakage of the inner pipe due to the detent holes can be prevented by the inner liner tube (12) provided at the inner pipe (1).
Claims7
A suction tube for a vacuum cleaner comprising:
- an outer pipe;
- an inner pipe received in said outer pipe, the inner pipe having an outer surface and an inner surface and being provided axially with a row of detent holes, each of which penetrates through the wall of the inner pipe from said outer surface to said inner surface;
- a locking device having a detent pin for positioning said inner pipe with respect to said outer pipe;
- a guiding bush attached to said outer pipe, a first guiding member disposed at the guiding bush;
- a second guiding member attached to said inner pipe, being engageable and slidable with said the first guiding member so that said inner pipe and said outer pipe can move axially with respect to each other;
- a separate inner liner layer secured at a fixed position to the inner surface of said inner pipe, the inner liner layer isolating vacuum of the inner pipe from the detent holes;
- wherein said detent pin of said locking device is inserted into one of said detent holes when said locking device is in a locking state, and disengages with the detent hole when said locking device is in an unlocking state;
- and
- said inner liner layer is an inner liner tube having an outer surface and an inner surface and which is provided at its outer surface with a groove extending axially along said inner liner tube and facing said detent holes.
Dependencies are inferred from the claim text.