Mechanism for adjusting height of handle bar of pushcart

Claim 1

A mechanism for adjusting the height of a handle bar for a pushcart, said pushcart including a pair of upwardly-extending bars of a tubular construction, a handgrip bar of a hollow tubular construction having a U-shape with a pair of end portions, wherein each of said upwardly-extending bars is slidably fitted into a corresponding one of said end portions of said handgrip, said mechanism comprising: a plurality of engaging apertures formed in the side of each of said upwardly-extending bars adjacent to an upper end thereof and spaced at predetermined intervals, said engaging apertures being connected together by connecting slots which are narrower than said engaging apertures; a pair of retainer members each being engageable with a corresponding one of said end portions of said handgrip bar, and each being disposed at a position corresponding to said engaging apertures; flanges projecting from opposite sides of each said retainer member in inclined relation being received respectively in inclined slide guide grooves formed in an elevation operating member; and wherein each said retainer member is moved outwardly and inwardly in a direction perpendicular to the sliding movement of said elevation operating member when said elevation operating member is slidingly moved upwardly and downwardly.