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US 4,540,965 AGranted
Electromagnetic assembly
AssigneeKabushiki Kaisha Tokai Rika Denki Seisakusho
InventorsMasaichi Hattori, Shigeo Hara, Shunichi Manabe
Life of this patent
Estimating the term…
Abstract
An electromagnet assembly is provided. It has a first movable core and a second movable core provided in association with a coil. The first movable core is energized toward the second movable core by a first spring while the second movable core is urged in the direction away from the first movable core by a second spring which has larger biasing force than that of the first spring. When the second movable core is attracted by magnetic excitation of the coil, the first movable core is pressed downwards by the second movable core.
Claims20
An electromagnetic assembly operable at two energization levels, comprising:
- (a) affixed position core means;
- (b) coil means disposed about said core means and including means connecting said coil means to a source of electricity for energizing said coil means and thereby generating a magnetic circuit;
- (c) a first magnetically movable member associated with said core means so as to be positioned in said circuit when said coil is energized and said first member movable between a first and a second position;
- (d) a second magnetically movable member associated with said first member so as to be positioned in said circuit when said coil is energized and said second member movable between a first and a second position;
- (e) first resilient means bearing against said first member for urging said first member from said first to said second position;
- (f) second resilient means bearing against said second member for urging said second member from said first to said second position and said second resilient means exerts a force greater than the force exerted by said first resilient means;
- (g) said second member spaced from said first member when said second member is in said second position and said first member is in said first position;
- and,
- (h) retaining means operably associated with said first member for maintaining said first member in said first position when said coil means is not energized whereby energization of said coil means to a preselected first level causes said first member to move from said first to said second position and to thereby engage said second member and subsequent energization of said coil means to a preselected second level greater than the first level causes said engaged first and second members to move from said second to said first positions.
6 more elements
An electromagnetic assembly, comprising:
- (a) a coil adapted to be electrically energized for generating a magnetic circuit and said magnetic circuit associated with the energization of said coil;
- (b) switch means operably connected to said coil, a source of electrcity and to a load for simultaneously energizing said coil and causing an operation to be performed on said load;
- (c) a fixedly positioned core associated with said coil so as to be positioned in said magnetic circuit when said coil is energized;
- (d) first and second magnetically movable members cooperatively associated with said core and adapted for being moved in response to energization of said coil;
- (e) first resilient means bearing against said first member for urging said first member towards said second member;
- (f) second resilient means bearing against said second member for urging said second member away from said first member and said second resilient means exerting a force exceeding the force exerted by said first resilient means for thereby spacing said first member from said second member;
- and,
- (g) retainer means cooperatively associated with said switch means and operatively engaged with said first member for maintaining said first and second members spaced apart;
- (h) whereby, positioning of said switch means in a first operative position causes the load to be operated on and said coil to be energized to a first preselected level generating a magnetic circuit causing said first member to be attracted to said second member with sufficient force to overcome said retaining means so that said first member engages said second member and thereby locks said switch means in said first position and, upon completion of the operation on said load, said coil is energized to a second level higher than said first level and generates a magnetic circuit causing said second member to be attracted to said core with sufficient force to overcome said second resilient means so that said second member engages said core and thereby shifts said switch means to a second position associated with completion of the operation and cessation of energization of said coil.
6 more elements
Dependencies are inferred from the claim text.