Handle assembly having lock mechanism

An appliance assembly, comprising:

• a casing of an appliance having a first aperture thereon;
• a supporting frame having a second aperture thereon for supporting said appliance;
• a handle grip member movably coupled with a casing of said appliance for receiving a first external force and a second external force;
• and
• a lock mechanism coupled with said handle grip member and mounted inside said casing, comprising:
• a holding member having a slot thereon and fixedly mounted on a side wall of said casing;
• a sliding member having a salient portion thereof and having one end connected with said handle grip member for sliding back and forth, wherein said slot and said salient portion are engaged with each other when said handle grip member receives said first external force, and said slot and said salient portion are separated from each other when said handle grip member receives said second external force;
• a first spring connecting said sliding member and said casing for generating a first elastic force in response to said first external force and said external second force;
• and
• an engaging member having a cylinder mounted thereon and movably positioned on said side wall of said casing for engaging with said sliding member through said cylinder,
• wherein said lock mechanism locks said handle grip member to said casing when said handle grip member receives said first external force, and unlocks said handle grip member when said handle grip member receives said second external force.