초록 ▼

A back pack having a frame adapted for limited flexing responsive to relative hip and shoulder movement of a hiker. A generally inverted U-shaped main frame unit has side bars that rotate under torsional resistance in a fore and aft direction about a transverse support bar. A cross bar support assem

A back pack having a frame adapted for limited flexing responsive to relative hip and shoulder movement of a hiker. A generally inverted U-shaped main frame unit has side bars that rotate under torsional resistance in a fore and aft direction about a transverse support bar. A cross bar support assembly is coupled to the side bars by fittings that provide for relative rotational and pivotal movement between members of the cross bar assembly and the side bars, thereby permitting such frame flexing.

대표청구항 ▼

A back pack frame assembly adapted for limited flexing in response to normal use, due to relative hip and shoulder movement of a hiker, comprising: first and second side bars disposed in spaced and generally parallel relation; a transverse support bar extending between and connecting said first and

A back pack frame assembly adapted for limited flexing in response to normal use, due to relative hip and shoulder movement of a hiker, comprising: first and second side bars disposed in spaced and generally parallel relation; a transverse support bar extending between and connecting said first and second side bars, said support bar and side bars being connected integrally as a unit so as to define a main frame unit, said side bars being connected for limited relative counter-rotational movement about the axis of said transverse bar under normal use conditions to provide flexibility to said main frame unit; cross bar means including a transversely extending cross bar extending between and interconnecting said side bars; and coupling means movably connecting first and second ends of said cross bar to said first and second side bars, respectively, said coupling means including first and second fittings, each fitting being mounted on one end of said cross bar and adapted to engage a corresponding side bar for free pivotal motion thereabout, each said fitting being pivotable about the longitudinal axis of its corresponding side bar when said main frame is flexed under normal use to produce said counter-rotational movement of said side bars.