Patent ID: 8651596

Claim:
An image formation apparatus, comprising: a housing; a rockable member rockably secured to the housing; a lock mechanism including an engaging portion and an engageable portion, the engaging portion being formed to one of the housing and the rockable member, the engageable portion being formed to the other of the housing and the rockable member, the engageable portion being engageable with the engaging portion, the engageable portion being displaceable with respect to the other of the housing and the rockable member, a separating force which causes the engageable portion to displace from the engaging portion being applicable to the engageable portion, the rockable member being locked with respect to the housing when the engageable portion is engaged with the engaging portion; a guide member secured to the other of the housing and the rockable member, the guide member being displaceable, with respect to the other of the housing and the rockable member, integrally with the engageable portion; and a guiding member provided to the one of the housing and the rockable member, the guiding member slidably contacting the guide member to displace the guide member with respect to the other of the housing and the rockable member when the rockable member rocks so that the state of the rockable member is changed from a rockable state to an unrockable state, wherein the engageable portion is displaced to move closer to the engaging portion in a case where the guide member contacts the guiding member than in a case where the guide member does not contact the guiding member, and wherein the guide member and the engageable portion are configured such that, when the state of the rockable member changes from the rockable state to the unrockable state, the guide member contacts the guiding member and the engageable portion displaces integrally with displacement of the guide member relative to the other one of the housing and the rockable member.