Swing having seat units with tiltable backrests

A swing comprising:

• a pair of seat units, each of said seat units including
• front and rear connecting rods extending in a longitudinal direction,
• spaced apart inverted U-shaped inner and outer side frames extending in a transverse direction relative to said longitudinal direction and respectively having inner and outer front legs connected to said front connecting rod, and inner and outer rear legs connected to said rear connecting rod,
• a seat frame disposed between said inner and outer side frames,
• a first pivot,
• a backrest frame extending upwardly from and pivoted to said seat frame through said first pivot, and
• an inclination-adjusting unit including a second pivot that is parallel to and that is disposed at an elevation above said first pivot, opposite inner and outer engaging plates that are fixed respectively to said inner and outer side frames and that extend in said transverse direction, and opposite elongated inner and outer operating arms extending in said transverse direction and disposed respectively adjacent to said inner and outer engaging plates, each of said inner and outer engaging plates being formed with a plurality of intercommunicated engaging grooves, each of said inner and outer operating arms having a rear arm section pivoted to said backrest frame through the second pivot, and a front arm section formed with an engaging tongue that extends transversely therefrom and that engages a selected one said engaging grooves in a respective one of said engaging plates, thereby positioning said backrest frame at a desired angle relative to said seat frame;
• and
• an upright support frame having opposite top and bottom ends, and left and right suspending members having upper ends connected swingably to said top end of said support frame, and lower ends connected swingably and respectively to said outer side frames of said seat units.