Spring mechanism used for dual power transfer switch and dual power transfer switch

A dual power transfer switch comprising a spring mechanism, which is characterized by comprising:

• a base, mounted on a housing of the dual power transfer switch;
• a spring, mounted on the base, wherein the spring comprises a first leg configured to contact and exert a pressure on an indicator of the dual power transfer switch, so as to generate a frictional force between the first leg and the indicator and reduce a rebound of the indicator upon the indicator moving between a first indicating position and an intermediate indicating position, wherein the first indicating position indicates that the dual power transfer switch is in a first power-on position, and the intermediate indicating position indicates that the dual power transfer switch is in a dual-off position,
• upon the dual power transfer switch being switched from the dual-off position to the first power-on position, the indicator moves from the intermediate indicating position to the first indicating position, and upon the indicator moving to the first indicating position, the first leg is in contact with a first lateral portion of the indicator, so that the pressure exerted by the first leg on the indicator comprises a first horizontal component and a first vertical component, and the first horizontal component is oriented to push the indicator toward the first indicating position, so as to further prevent the rebound of the indicator,
• the spring mechanism further comprises a first groove for accommodating the first leg of the spring, and a size of the first groove is designed to match a diameter of the first leg, so that the first leg is allowed to move only in a depth direction of the first groove,
• the spring further comprises a second leg configured to contact and exert a pressure on the indicator of the dual power transfer switch, so as to generate a frictional force between the second leg and the indicator and reduce the rebound of the indicator upon the indicator moving between a second indicating position and the intermediate indicating position, and the second indicating position indicates that the dual power transfer switch is in a second power-on position,
• upon the dual power transfer switch being switched from the dual-off position to the second power-on position, the indicator moves from the intermediate indicating position to the second indicating position, and upon the indicator moving to the second indicating position, the second leg is in contact with a second lateral portion of the indicator, so that the pressure exerted by the second leg on the indicator comprises a second horizontal component and a second vertical component, and the second horizontal component is oriented to push the indicator toward the second indicating position so as to further prevent the rebound of the indicator.