PROBLEM TO BE SOLVED: To provide a lift linkage device for a lawn mower for lifting the lawn mower in a central part by utilizing a working machine lifting device in the rear of a tractor, and easily switchable to an original function as the rear working machine lifting device.SOLUTION: The lawn mower includes a rear working machine lifting link mechanism (46) which connects a rear working machine to the rear of a body of the tractor (1) so as to be liftable, and the lawn mower (5) is mounted by a front link (43) and a rear link (45) in the central part of the tractor (1) so as to be liftable. The lawn mower also includes a lawn mower lifting link mechanism (48) between the lawn mower (5) and the rear working machine lifting link mechanism (46), and a lawn mower lifting retaining mechanism (60) is assembled in the lawn mower lifting link mechanism (48). The lawn mower also includes an accommodation mechanism (64) which can independently lift the rear working machine lifting link mechanism (46) while the lawn mower (5) is lifted and retained by the lawn mower lifting retaining mechanism (60).COPYRIGHT: (C)2012,JPO&INPIT【課題】腹部の芝刈機をトラクタ後部作業機昇降装置を利用して昇降させる芝刈機の昇降連動装置であって、後部作業機昇降装置としての本来機能に簡単容易に切り替え得る昇降連動装置を提供する。【解決手段】トラクタ(1)の車体の後部に後作業機を昇降自在に連結する後作業機昇降リンク機構(46)を備え、該トラクタ(1)の腹部に前リンク(43)と後リンク(45)によって芝刈機(5)を昇降自在に装着し、該芝刈機(5)と前記後作業機昇降リンク機構(46)との間に芝刈機昇降リンク機構(48)を備えると共に、該芝刈機昇降リンク機構(48)に芝刈機上昇保持機構(60)を組み込み、該芝刈機上昇保持機構(60)によって芝刈機(5)を上昇保持した状態で前記後作業機昇降リンク機構(46)を独立して昇降連動可能に融通機構(64)を設ける。【選択図】 図5
