PROBLEM TO BE SOLVED: To enhance certainty of operation, durability and operability of a height adjustment mechanism of a walking lawn mower.SOLUTION: The walking lawn mower 10 includes a height adjustment mechanism 20 for adjusting the ground height of a housing 11. The height adjustment mechanism comprises a front wheel support member 21L and a rear wheel support member 22L vertically swingably mounted to the housing, a connection member 25 for interlockably connecting the front and rear wheel support members to each other, and a lock mechanism 50 for restricting and releasing the displacement in a longitudinal direction of the connection member. The lock mechanism comprises a plurality of engagement grooves 51 arranged on the connection member in one row at front and rear sides, a lock pin 52 capable of being selectively engaged with one of the plurality of engagement grooves, a pin guide part 53 for guiding the lock pin relative to one of the plurality of engagement grooves so as to be put in/out, and an operation member 54 for sliding/operating the lock pin.COPYRIGHT: (C)2012,JPO&INPIT【課題】歩行型芝刈機の高さ調整機構の作動の確実性と耐久性と操作性を高める。【解決手段】ハウジング11の地上高を調整するための、高さ調整機構20を備えた歩行型芝刈機10である。高さ調整機構は、ハウジングに上下スイング可能に取り付けられた前輪支持部材21L及び後輪支持部材22Lと、前及び後輪支持部材同士を互いに連動可能に連結するための連結部材25と、連結部材の前後方向の変位を規制及び解除するためのロック機構50とからなる。ロック機構は、連結部材に前後一列に配列された複数の係止溝51と、複数の係止溝の1つに選択的に係止することが可能なロックピン52と、ロックピンを複数の係止溝の1つに対して出入り可能に案内するピン案内部53と、ロックピンをスライド操作する操作部材54とからなる。【選択図】図3
