Baby carriage frame

Claim 1

A collapsible baby carriage frame assembly, comprising an upper frame and including a crossbar structure comprising two spaced apart front crossbars extending obliquely upwardly of the longitudinal direction of the carriage and two spread apart rear crossbars extending adjacent said front crossbars and crossing the same at an angle symmetrical of said longitudinal direction, said front and rear crossbars extending to common upper and lower levels and being pivoted to each other at their cross-points and thereby adapted to be folded and to be unfolded and locked to serve as a support for a baby cabin and each crossbar having obliquely extending upper end portions and lower end portions extending in said longitudinal direction of the carriage; a handle bar having a handle portion and two spaced apart legs adapted to form extensions of said rear crossbars and having each a free end portion pivotally connected to the respective one of said upper end portions of said rear crossbars, the pivots defining an axis transverse to said longitudinal direction about which said handle bar is foldable toward said front crossbars; a spring element structure supporting said crossbar structure and comprising two spaced apart spring tube members of upwardly open bracket-like configuration and extending, in assembled state, in vertical alignment with the respective crossbars, each of said spring tube members having two free end portions projecting inwardly in said longitudinal direction and axially aligned with the respective lower end portions of said crossbars and a lower middle portion extending in the same direction; and means for yieldably connecting said lower end portions of said crossbars to said upper end portions of said spring tube members in a definite spaced relationship while permitting their mutual rotation about their longitudinal axes to enable said spring tube members to be folded toward said crossbar structure; a lower frame including two spaced apart connection members extending in said longitudinal direction and, in assembled state, adjacent said lower middle portions of said spring tube members; two spaced apart wheel axles extenDing between and secured to said connection members; and means for locking said lower frame in position on a supporting surface, each of said connection members comprising a front connection bar having an outer and an inner end and being secured to one of said wheel axles, and a rear connection bar having an outer and an inner end and being secured to the other wheel axle, said inner ends of said front and rear connection bars of each connection member being pivoted to each other in the space between said axles and said pivots defining an axis which is parallel to said axles and about which said rear connection bars along with the respective axle are pivotable relative to said front connection bars to fold said lower frame; wheel means mounted by twos on each of said lower middle portion of said spring tube members in spaced relationship corresponding to the spacement of said wheel axles; and means for mutually engaging and locking said wheel means to said lower frame in assembled state and unlocking and disengaging the same while collapsing said frame assembly.