Patent ID: 8177290

Claim:
A cab reinforcement structure for reinforcing a cab including a support column member and a beam member joined to the support column member, the cab reinforcement structure comprising: a gusset arranged external to the support column member and the beam member at a corner at which the support column member and the beam member meet each other in order to externally support the corner, a first gusset retaining member that is disposed within the beam member in relation to the gusset, for sustaining a load from a gusset side, and a second gusset retaining member that is disposed within the support column member in relation to the gusset, for sustaining a load from the gusset side, wherein the first gusset retaining member and the second gusset retaining member are separate elements from the gusset, and wherein the gusset includes an angular portion defined by sides, a beam member side-end portion that is integral with the angular portion and that projects away from the support column member, and a support column member side-end portion that is integral with the angular portion and that projects away from the beam member, and wherein the first gusset retaining member comprises a plate-like member that is in contact with all inner surfaces of the beam member and completely blocks up a cross-section of an interior of the beam member at a position corresponding to the beam member side-end of the gusset, and wherein the second gusset retaining member comprises a plate-like member that is in contact with all inner surfaces of the support column member and completely blocks up a cross-section of an interior of the support column member at a position corresponding to the support column member side-end of the gusset.