초록 ▼

A magnetic switch comprises a first frame and a second frame, a stationary contact to face the second frame, a movable contact contactable with or separated from the stationary contact, a coil assembly that generates a magnetic force in accordance with a flow of an electric current, a movable unit t

A magnetic switch comprises a first frame and a second frame, a stationary contact to face the second frame, a movable contact contactable with or separated from the stationary contact, a coil assembly that generates a magnetic force in accordance with a flow of an electric current, a movable unit that makes the movable contact to be contactable with or separated from the stationary contact, a contact spring that applies an elastic force to the movable contact in a direction that the movable contact moves toward the stationary contact, a movable distance limiting unit limiting a movable distance of the movable unit to determine a contact pressure distance that the movable contact contacts the stationary contact and the contact spring is pressed, and a return spring to apply an elastic force to the movable unit in a direction that the movable contact is separated from the stationary contact.

대표청구항 ▼

1. A magnetic switch comprising: a first frame;a second frame coupled to the first frame;a stationary contact installed at the first frame to face the second frame;a movable contact configured to make contact with or be separated from the stationary contact;a coil assembly installed at the second fr

1. A magnetic switch comprising: a first frame;a second frame coupled to the first frame;a stationary contact installed at the first frame to face the second frame;a movable contact configured to make contact with or be separated from the stationary contact;a coil assembly installed at the second frame to face the first frame and having a coil configured to generate a magnetic force according to a flow of an electric current through the coil;a movable unit configured to cause the movable contact make contact with or be separated from the stationary contact while reciprocating through a central portion of the coil assembly, the movable unit comprising a shaft configured to movably support the movable contact in an axial direction and a core coupled to a periphery of the shaft such that the core is movable together with the shaft;a contact spring configured to apply an elastic force to the movable contact in a direction that the movable contact moves toward the stationary contact;a movable distance limiting unit formed at the first frame, the movable distance limiting unit configured to limit a movable distance of the movable unit in order to determine a contact pressure distance for the movable contact to make contact with the stationary contact when the contact spring is pressed; anda return spring configured to apply an elastic force to the movable unit in a direction that the movable contact is separated from the stationary contact,wherein the movable distance limiting unit comprises a guide portion having an accommodation groove configured to accommodate one end portion of the movable unit;wherein a protrusion protrudes from a bottom surface of the accommodation groove toward the movable unit,wherein the shaft comprises a spring support groove configured to guide entry of the protrusion, andwherein the return spring is located between the spring support groove and the protrusion. 2. The switch of claim 1, wherein: the shaft further comprises a movable contact hole configured to guide the movable contact through the movable contact hole such that the movable contact is movable in the axial direction of the shaft; andthe contact spring is installed in the movable contact hole. 3. The switch of claim 2, wherein: an anti-rotation protrusion protrudes from the periphery of the shaft and extends in the axial direction of the shaft;an anti-rotation recess is formed in the accommodation groove; andthe anti-rotation protrusion is inserted in the anti-rotation recess in order to be guided such that the shaft is movable while rotation of the movable contact is prevented.