Electromagnetic switch device

An electromagnetic device, comprising in combination:

• a cylindrical housing adapted to be fixed to a stationary member of a device to which said electromagnetic switch device is applied, said housing having a radially extending end wall located adjacent said stationary member, a bobbin accommodated within said housing, said bobbin having a hollow cylindrical axial portion, a solenoid carried by said bobbin;
• a cap member fixed to one end of said housing opposite to said end wall of said housing;
• a first annular yoke member interposed between said housing and said cap member and extending radially of said housing, a second annular yoke member interposed between said end wall of said housing and said bobbin and extending radially of said housing, a stationary core positioned inside said bobbin, said cap member defining therein an internal space in cooperation with said yoke member and said stationary core, a movable core movable relative to said stationary core and extending in part through said stationary core into said internal space in said cap member, a fixed contact secured in said cap member, a moving contact mounted on said movable core in face-to-face relation to said fixed contact, resilient means interposed between said movable core and said stationary core and urging said movable core in a direction away from said stationary core, said first annular yoke member, said bobbin, said second annular yoke member and said end wall of said housing being juxtaposed axially of said housing, air passage means extending through said first annular yoke member, said second annular yoke member, said bobbin and said end wall of said housing to establish communication between said internal space in said cap member with the atmosphere outside of said electromagnetic switch device, and a sleeve fitted in said hollow cylindrical axial portion of said bobbin along an inner peripheral surface thereof, said sleeve having one end thereof engaged between said end wall of said housing and said second annular yoke member and an opposite end thereof terminating at an intermediate portion of said bobbin and supported by an annular stepped shoulder formed in at least one of opposed surfaces of said bobbin and said stationary core.

An electromagnetic switch device, comprising in combination:

• a cylindrical housing adapted to be fixed to a stationary member of a device to which said electromagnetic switch device is applied, said housing having a radially extending end wall located adjacent said stationary member, a bobbin accommodated within said housing, a solenoid carried by said bobbin, a cap member fixed to one end of said housing opposite to said end wall of said housing, an annular yoke member interposed between said housing and said cap member and extending radially of said housing, a stationary core positioned inside said bobbin, said cap member defining therein an internal space in cooperation with said yoke member and said stationary core, a movable core movable relative to said stationary core and extending in part through said stationary core into said internal space in said cap member, a fixed contact secured in said cap member, a moving contact mounted on said movable core in face-to-face relation to said fixed contact, resilient means interposed between said movable core and stationary core and urging said movable core in a direction away from said stationary core, said yoke member, said bobbin and said end wall of said housing being juxtaposed axially of said housing, air passage means extending through said yoke member, said bobbin and said end wall of said housing to establish communication between said internal space in said cap member with the atmosphere outside of said electromagnetic switch device, wherein said one end of said housing includes an annular stepped shoulder formed in an inner peripheral surface thereof, a portion extending from said stepped shoulder toward said cap member and having an inner diameter larger than the remainder of said housing, and at least one recess formed in said annular peripheral surface thereof and located inwardly adjacent said stepped shoulder, said yoke member having at least one protuberance engaged in said recess of said housing, said cap member having one end thereof disposed in contact with said yoke member and formed with an annular ridge on an outer peripheral surface thereof, said portion of said housing with a larger inner diameter having an annular end edge disposed over said annular ridge of said cap member and caulked thereto along the entire periphery thereof.

An electromagnetic switch device, comprising in combination:

• a cylindrical housing adapted to be fixed to a stationary member of a device to which said electromagnetic switch device is applied, said housing having a radially extending end wall located adjacent said stationary membe and having a central opening;
• a bobbin accommodated within said housing, a solenoid carried by said bobbin, a cap member fixed to one end of said housing opposite to said end wall of said housing, an annular yoke member interposed between said housing and said cap member and extending radially of said housing, a stationary core positioned inside said bobbin, said cap member defining therein an internal space in cooperation with said yoke member and said stationary core, a movable core extending through said central opening in said end wall of said housing and movable relative to said stationary core, said movable core extending in part through said stationary core into said internal space in said cap member, said movable core having an enlarged main body, and a hook portion projected from said main body in a direction away from said stationary core and having a diameter smaller than that of said main body, a fixed contact secured in said cap member, a moving contact mounted on said movable core in face-to-face relation to said fixed contact, resilient means interposed between said movable core and said stationary core and urging said movable core in a direction away from said stationary core, said yoke member, said bobbin and said end wall of said housing being juxtaposed axially of said housing, air passage means extending through said yoke member, said bobbin and said end wall of said housing to establish communication between said internal space in said cap member with the atmosphere outside of said electromagnetic switch device, and stopper means having a stopper surface disposed for pressure contact with said enlarged main body of said movable core to prevent movement of the latter in a direction away from said stationary core beyond a predetermined position.