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A riding mower chassis frame comprises a pair of identical beams extending along the chassis at its opposite sides. A one-piece channel-shaped member bridges the beams near the rear of the chassis to give the frame rigidity, provide for laterally swingable connection to the frame of a rear axle on w

A riding mower chassis frame comprises a pair of identical beams extending along the chassis at its opposite sides. A one-piece channel-shaped member bridges the beams near the rear of the chassis to give the frame rigidity, provide for laterally swingable connection to the frame of a rear axle on which steerable wheels are mounted, and serve as a pan in which movable weights are carried. A platform mounted on the rear of the frame, for carrying interchangeable accessories, is swingable to and from a horizontal load carrying position about a transverse axis at the rear of the frame. An automatically engaging releasable latch on the platform cooperates with another frame member that bridges across the beams.

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In a self-propelled riding vehicle: an elongated, longitudinally extending frame comprising a pair of laterally spaced apart beam elements having a top surface, a bridging member extending laterally between said beam elements, and a laterally extending angle iron secured to and bridging across said

In a self-propelled riding vehicle: an elongated, longitudinally extending frame comprising a pair of laterally spaced apart beam elements having a top surface, a bridging member extending laterally between said beam elements, and a laterally extending angle iron secured to and bridging across said beam elements with its apex uppermost, a pair of front, ground engaging traction wheels mounted adjacent a front end of said frame for propelling said vehicle; a pair of steerable wheels mounted adjacent a rear end of said frame; a mid-mounted power source on said frame for driving said traction wheels; an accessory platform having a front edge and a rear edge, said platform mounted on and adjacent the rear end of said frame; means for pivotally connecting said frame and said platform to enable said platform to pivot about a transverse, horizontal hinge axis located adjacent its rear edge, whereby said platform can swing between a generally horizontal accessory carrying position and a downwardly and rearwardly tilting position in which said front edge of said platform is raised; and operator controlled latch means between said frame and said platform for locking said platform in said horizontal position, said latch means comprising: (1) said laterally extending angle iron which is secured to and bridging across said beam elements with its longitudinal edges resting upon their top surfaces and its apex uppermost so as to provide an upper surface that is inclined rearward and downward from its apex, said angle iron being spaced forward from said hinge axis for supporting engagement by a front portion of said platform in its said horizontal position; (2) a latching member carried by said platform and having a latch portion spaced beneath said platform and confined to movement relative to said platform substantially in said fore-and-aft direction between a forward latching position in which said latch portion can engage under said angle iron and a rearward releasing position in which said latch portion is clear of said angle iron; (3) biasing means reacting between said platform and said latching member to urge said latch portion towards its latching position, said biasing means being yieldable to permit said latch portion to be cammed to its releasing position by said surface on said angle iron as said platform swings towards its load carrying position; and (4) a manual actuator accessible adjacent to one edge of said platform and connected with said latching member for manually shifting said latch portion to its releasing position.