Movable contact holder of electrical apparatus and assembling method of the movable contact holder

An electromagnetic contactor assembly comprising:

• a movable contact holder including a plurality of contact pairs, each contact pair including a bridge contact assembly and a contact spring;
• a plurality of the stationary contact assemblies arranged with each being made opposite to each of the bridge contact assemblies held in the movable contact holder;
• an electromagnet including a fixed core and a movable core;
• and
• a member that couples the movable contact holder to the movable core;
• wherein movement of the movable core is transmitted to the movable contact holder via the member to move the bridge contact assembly of each of the contact pairs into contact with the stationary contact assemblies.

A method of assembling a moveable contact holder configured to hold a plurality of contact pairs, each contact pair including a bridge contact assembly and a spring, the moveable contact holder including a movable contact holder base with one side thereof opened to have a plurality of recesses each being formed for holding a contact pair isolated from other contact pairs, and with another side opposite to the opened side formed as a bottom wall of each of the recesses, and a movable contact holder cover that couples to the movable contact holder base, wherein the movable contact holder cover covers the one side of the movable contact holder base that is opened, the method comprising:

• a first step of inserting an assembling jig into each of the recesses and bringing the inserted assembling jig to one end side of the recess to be on standby with the movable contact holder cover being removed;
• a second step of inserting a contact spring into a space in each of the recesses from one side of the movable contact holder base to be attached thereto while being kept in a free length state, the space being between the assembling jig and a wall surface on the other end side of the opening inside the recess;
• a third step of shifting the assembling jig in each of the recesses to compress the contact spring from the free length state and bringing the contact spring to a wall surface on the other end side of the opening in the recess;
• a fourth step of inserting a bridge contact assembly into a space in each of the recesses from one side of the movable contact holder base to attach the bridge contact assembly to the movable contact holder base with the contact spring being compressed and brought to the wall surface on the other end side of the opening in the recess, the space being between a wall surface on the one end side of the opening and the assembling jig compressing the contact spring of the recess;
• and
• a fifth step of drawing out the assembling jig from each of the recesses in the movable contact holder base after the bridge contact assembly is attached and laying a movable contact holder cover on the one side of the movable contact holder base to be made combined with the movable contact holder base.