JPWO2023149129A5 - - Google Patents

Claims (6)

A thermal relay having a bimetal that detects an overload current and displaces in a curved manner, a release lever that moves in response to the displacement of a shifter that is linked to the bimetal, and a contact reversing mechanism that performs a reversing operation in response to the rotation of the release lever to switch the contacts,
the contact reversal mechanism includes a movable plate disposed on the reversal mechanism support section with one end as a fulcrum and the other end side swingable, the movable plate having a movable contact of a contact provided on one surface, and a reversal spring stretched between the other end side of the movable plate located on opposite sides of the fulcrum and a spring support section formed on the reversal mechanism support section,
a second movable plate holding arm extending from one of the first movable plate holding arms, against which the other end of the movable plate leans and supporting the movable plate in a tilted state with a constant amount of tilt, the second movable plate holding arm being extended from one of the first movable plate holding arms and having a V-shaped support groove on which the one end of the movable plate rests as the fulcrum, the second movable plate holding arm being extended from one of the first movable plate holding arms and having the other end of the movable plate lean against which the second movable plate retains the movable plate in a tilted state with a constant amount of tilt. The thermal relay according to claim 1, characterized in that the support grooves formed in the pair of first movable plate holding arms are formed by pressing. The thermal relay according to claim 1 or 2, characterized in that the second movable plate holding arm is formed with a positioning protrusion against which the other surface of the movable plate rests. The thermal relay according to claim 3, characterized in that the positioning protrusion is formed by boss molding. The reversing spring is a tension coil spring having first and second hook-shaped engaging portions at both ends,
An engagement recess is formed by cutting out a side portion of the other end of the movable plate, and a V-shaped engagement groove is formed in the spring support portion formed in the reversing mechanism support portion,
3. The thermal relay according to claim 1, wherein the tension coil spring is mounted with the first hook-shaped engagement portion engaging with the engagement recess of the movable plate and the second hook -shaped engagement portion engaging with the engagement groove of the spring support portion, and applies a tensile force to the movable plate. The thermal relay according to claim 5, characterized in that the spring support portion is formed with a hook positioning wall that is continuous with the engagement groove and that guides the second hook-shaped engagement portion into the engagement groove when the second hook-shaped engagement portion abuts against the hook positioning wall during installation.