Vibration-isolating device for steering wheel of traveling working vehicle with wheel steering mechanism

A vibration-isolating device for a steering wheel of a traveling working vehicle equipped with a wheel steering mechanism, comprising:

• a first steering shaft that transmits rotational displacement, the first steering shaft being operatively connected to the steering wheel;
• a second steering shaft that transmits rotational displacement, the second steering shaft being operatively connected to the wheel steering mechanism;
• a vibration-isolating connecting mechanism that operatively connects the first steering shaft and the second steering shaft to each other so that rotational displacement can be transmitted,
• whereby when the angles of rotational displacement of the first and second steering shafts are within ranges of rotation angles for linearly driving the vehicle, rotational displacement cannot be transmitted between the first steering shaft and the second steering shaft, and when the angles of rotational displacement of the first and second steering shafts are beyond the ranges of rotation angles for linearly driving the vehicle, rotational displacement can be transmitted between the first steering shaft and the second steering shaft;
• and
• wherein the vibration-isolating connecting mechanism has at least one engage member connected to one of the first and second steering shafts, at least one opposite engage member connected to the other one of the first and second steering shafts, and a vibration-isolating rubber member disposed between the engage member and the opposite engage member;
• and
• when the angles of rotational displacement of the first and second steering shafts are within the ranges of rotation angles for linearly driving the vehicle, at least one of the engage member and the opposite engage member is not in contact with the vibration-isolating rubber member, and when the angles of rotational displacement of the first and second steering shafts are beyond the ranges of rotation angles for linearly driving the vehicle, the engage member and the opposite engage member are in contact with the vibration-isolating rubber member.