Electromagnetic switching device

Patent metadata

Field	Value
Publication number	US-9330873-B2
Application number	US-201314078345-A
Country	US
Kind code	B2
Filing date	Nov 12, 2013
Priority date	Feb 18, 2013
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

Disclosed is an electromagnetic switching device. The electromagnetic switching device includes a housing, a fixed contact point inside the housing, a movable contact point positioned under the fixed contact point to repeatedly perform contact with the fixed contact point and separation from the fixed contact point, a shaft coupled with the movable contact point, a return spring to continuously press the shaft downward, and a movable core coupled with the shaft. The shaft includes a pressing surface directed downward, and the movable core is provided to make contact with an upper end of the pressing surface, so that the movable core presses the pressing surface to move up the pressing surface if the movable core and the shaft move up, and the pressing surface presses the movable core downward to push down the movable core if the movable core and the shaft move down.

First claim

What is claimed is:

1. An electromagnetic switching device comprising:
a housing;
a fixed contact point inside the housing;
a movable contact including a movable contact point positioned under the fixed contact point to repeatedly contact with the fixed contact point and separate from the fixed contact point;
a shaft comprising a return spring receiving part coupled to the movable contact, a wipe spring receiving part coupled beneath the movable contact, and a pressing surface directed downward and located below the wipe spring receiving part;
a return spring mounted in the return spring receiving part to continuously press the shaft downward;
a wipe spring mounted in the wipe spring receiving part to continuously press the movable contact point upward;
a fixed core inside the housing, the fixed core including a hollow region receiving the wipe spring receiving part and the pressing surface;
a movable core located such that a top end of the movable core contacts the pressing surface, the movable core movable up and down according to a mutual electromagnetic force of the fixed core and the movable core; and
an elastic member coupled with a lower portion of the shaft, an upper portion of the elastic member at least partially inserted into the movable core and a bottom surface of the elastic member asymmetrically formed,
wherein the shaft comprises an open top end such that a hollow region is formed within the shaft to a predetermined depth;
wherein the wipe spring receiving part is located in the hollow region of the shaft such that the wipe spring extends into the hollow region of the shaft,
wherein the movable core presses the pressing surface upward when the movable core and the shaft move upward, and
wherein the pressing surface presses the movable core downward when the movable core and the shaft move downward.

2. The electromagnetic switching device of claim 1 , wherein:
the shaft further comprises a first portion having a first outer diameter beneath the return spring receiving part and a second portion having a second outer diameter beneath the first portion, the first outer diameter larger than the second outer diameter; and
the pressuring surface is a stepped surface formed at a boundary between the first portion and the second portion.

3. The electromagnetic switching device of claim 1 , wherein the wipe spring receiving part comprises a vertically extending cutting part.

4. The electromagnetic switching device of claim 3 , wherein the movable contact point moves up and down through the cutting part.

5. The electromagnetic switching device of claim 1 , further comprising an upper fixed part provided at an inner upper portion of the housing, the upper fixed part comprising an ascending limiter contacting the shaft to limit upward movement of the shaft.

6. The electromagnetic switching device of claim 5 , wherein:
the upper fixed part further comprises a return spring coupling part; and
the ascending limiter is a horizontally extending plane directed downward outside the return spring coupling part.

7. The electromagnetic switching device of claim 5 , further comprising a guide part extending downward outside the ascending limiter.

8. The electromagnetic switching device of claim 1 , further comprising a bobbin provided outside the fixed core, the bobbin comprising a protrusion protruding toward the hollow region of the fixed core and the fixed core positioned above the protrusion.

9. The electromagnetic switching device of claim 8 , wherein an inner end portion of the protrusion is positioned beyond an inner lateral side of the fixed core.

10. The electromagnetic switching device of claim 1 , wherein the shaft is configured to move perpendicularly downward but not perpendicularly upward such that the shaft collides with a side of the fixed core when moving upward in order to reduce an upward speed of the shaft.

11. The electromagnetic switching device of claim 10 , wherein:
an outer lateral side of the elastic member comprises a stepped portion; and
the stepped portion contacts a bottom surface of the movable core.

Assignees

• Lsis Co Ltd

Inventors

• Lee Sang Jin

Classifications

• H01H50/34

  Means for adjusting limits of movement; Mechanical means for adjusting returning force · CPC title

• H01H50/305

  damping vibration due to functional movement of armature (in air-gap H01H50/163) · CPC title

• H01H50/56 Primary

  Contact spring sets · CPC title

• H01H50/18 Primary

  Movable parts of magnetic circuits, e.g. armature · CPC title

• H01H50/54

  Contact arrangements · CPC title