A self-propelled material handler has a pivotally mounted boom on a frame, and
a cab that is positioned adjacent the side of the boom. The cab has an operator's
entrance and exit opening on a side of the cab, that is positioned to permit an
operator to enter and exit the cab and sit on a seat in the cab. A lateral restraint
bar is mounted between the seat and the cab opening, and is movable to a working
position where it obstructs the cab opening so that portions of the operator cannot
be moved outwardly through the cab side opening from the interior, and which pivots
to a raised position to permit an operator to pass through the cab opening. When
the restraint bar moves away from its working position, a signal is provided to
disable machine controls.
