To provide a unit support structure capable of maintaining a main bimetal in an upright posture even for a long time usage and securing safety of operation characteristics by suppressing creeping deformation through alleviating a residual stress of a rib accompanying a press-insertion into the rib formed projecting from right and left partitioning walls of a unit chamber of an outer case which insert-supports a support plate of a heater unit to be loaded on a thermal overload relay.
A heater unit 1 of a main bimetal 2 is loaded on an outer case 14, the heater unit 1 includes a structure in which the bimetal 2 is T-joint connected with a center of a support plate 15; a unit chamber 14a demarcated in the outer case 14 is provided with ribs 14d facing each other from their right and left sidewalls; the support plate 15 is made astride between the ribs 14d and is press-inserted to a lower face side for supporting the main bimetal 2 in an upright posture. Convex shaped step parts 14d-1 are formed on end sides of the ribs 14d toward the support plate 15 and push on a plate face of the support plate 15 so as to press-support a heater unit 1 in an upright posture.
TOYAMA KENTARO
MORISHITA FUMIHIRO
FURUHATA YUKIO
KAMOSAKI TAKEO
