Steering device for construction machine

A steering device for construction machine comprising:

• a steering column arranged on the front side of an operator's seat of a construction machine and steered by a steering wheel;
• a tilt angle adjusting mechanism for adjusting a tilt angle of said steering column;
• a column length adjusting mechanism for adjusting a column length of said steering column;
• and
• a tilt-up mechanism provided independently from said tilt angle adjusting mechanism and said column length adjusting mechanism and for tilting up said steering column together with said steering wheel to a tilt-up position away from said operator's seat with respect to a drive position close to said operator's seat;
• wherein
• said tilt-up mechanism is configured to perform a tilt-up operation of said steering column in a state where an adjusted position of said tilt angle and an adjusted position of said column length are maintained, characterized in that:
• said steering column is composed of a lower column accommodating a lower shaft for steering having the lower end side fixed to the side of a floor surface of said operator's seat and extending in the upper-lower direction, an upper column accommodating an upper shaft for steering attached to the upper side of said lower column movably in the front-rear direction and the upper-lower direction and extending in the upper-lower direction, and a joint member provided between said lower shaft and said upper shaft and transmitting a steering operation of said steering wheel between said shafts;
• between said lower column and said upper column of said steering column, a tilt-up member extending in the upper-lower direction between the both and constituting a part of said tilt-up mechanism is provided;
• on said tilt-up member, a pivot portion located in the middle of the length direction and rotatably attached to said lower column and an elongate hole portion for tilt angle adjustment arranged on the upper side of said pivot portion and to which said upper column is connected capable of adjusting said tilt angle are provided;
• said tilt angle adjusting mechanism, for performing adjustment of said tilt angle by tilting said upper column in the front-rear direction with respect to said lower column, includes a connecting member, provided on said upper column, connecting said upper column to said elongate hole portion of said tilt-up member, and maintaining said adjusted position of said tilt angle and a tilt lever which releases the connected state of said connecting member, by a rotating operation from the outside so that said upper column can relatively move along said elongate hole portion of said tilt-up member when said tilt angle is adjusted;
• and
• said column adjusting mechanism performs adjustment of said column length by moving said upper column in the upper-lower direction with respect to said lower column.