Foldable stroller and fold interlock mechanism

A foldable stroller comprising:

• a frame assembly having a frame fold joint and a seat connector defining a mounting point and being reconfigurable between an in-use configuration and a folded configuration, the seat connector including a lock pin parallel to and offset from a frame pivot axis, the lock pin having a contact end that protrudes from the seat connector in an unlocked state and a locking end, the lock pin being biased by a spring in a direction parallel to the frame pivot axis to project from the seat connector;
• a fold latch at the frame fold joint, the fold latch having a notch and being movable between a latched position with the frame assembly in the in-use configuration and a released position;
• a seat assembly on the frame assembly including a seat mount with a mount surface shaped to engage the seat connector and having a movable part that is movable relative to the frame assembly between an in-use position and a folded position on the frame assembly rendering the seat assembly unsuitable to support a child;
• and
• an interlock mechanism movable between a locked state with the fold latch in the latched position locking the frame assembly in the in-use configuration and an unlocked state with the fold latch in the latched position permitting the frame assembly to fold to the folded configuration,
• wherein, with the frame assembly in the in-use configuration and the seat assembly in the in-use position, the seat mount is coupled to the seat connector and the mount surface bears against the contact end of the lock pin and retains the locking end against the bias of the spring in the notch and the interlock mechanism is retained in the locked state thereby retaining the frame assembly in the in-use position, and
• wherein the interlock mechanism is unlocked by first moving the movable part to the folded position, allowing the bias of the spring to move the locking end out of the notch, whereby the interlock mechanism is moved to the unlocked state so that the frame assembly is movable to the folded configuration.