Expandable shaft

Winding – tensioning – or guiding – Coil holder or support – Radially expansible or contractile

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Details

279 207, B65H 7524

Patent

active

058033998

ABSTRACT:
An expandable shaft comprises: a shaft body having a central axis and an outer cylindrical surface; a fluid passageway extending along the central axis of the shaft body; fluid introducing ports radially outwardly extending and communicating with the fluid passageway; a fluid filling to the fluid passageway and the fluid introducing ports; grooves extending on the outer cylindrical surface of the shaft body in a direction of the central axis of the shaft body, wherein each groove communicates with the respective introducing ports; and long lugs slidably inserted into the grooves, wherein the long lugs are elastically returned in the grooves when a fluid pressure by the fluid is eliminated, and the long lugs are protruded from the outer cylindrical surface when the fluid pressure is applied. Thus, the long lugs are able to stroke within the limits of the difference of the angle between the sloped bottom portion of the long lugs and the sloped locking surface of the grooves.

REFERENCES:
patent: 3010671 (1961-11-01), Brown
patent: 4026491 (1977-05-01), Bostroem
patent: 4050643 (1977-09-01), Secor
patent: 4147312 (1979-04-01), Secor et al.
patent: 4154412 (1979-05-01), Briar et al.
patent: 4209138 (1980-06-01), Cecchi
patent: 4218029 (1980-08-01), Schwenzfeier et al.
patent: 4473195 (1984-09-01), Marin
patent: 5375791 (1994-12-01), Kline et al.
patent: 5509618 (1996-04-01), Kleiman et al.
patent: 5518203 (1996-05-01), Annaka et al.

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