US3792390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic actuator device
Assignee: Allis Chalmers Corp
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Filing: 1973-05-31
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Granted: 1974-02-19
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Expires: 1993-05-31
Abstract
Abstract There is provided in accordance with an embodiment of the invention a magnetic actuator device, such a flux cancelling, transferring or shifting type trip device comprising an annular permanent magnet, and a first main pole piece of magnetic material engaging one axial end of the permanent magnet and a threaded magnetic hollow stud member integral with the first main pole piece and extending axially upwardly through the central opening of the annular-shaped permanent magnet. One end of an annular magnetic shunting pole piece engages the opposite axial end of the permanent magnet. An annular magnetic sleeve engages the opposite axial end of the annular shunting pole piece. A plastic bobbin on which is wound an electrical trip coil is positioned radially inwardly of the annular magnetic sleeve. A second magnetic main pole piece of annular-shape engages the axially outer end of the magnetic sleeve. The second main pole piece has an integral hollow threaded magnetic stud member extending axially inwardly of the assembly. A hollow cylindrical magnetic armature is axially movable against a spring force through the opening of the annular second main pole piece and in the communicating hollow interior of the stud member carried by the second main pole piece. The armature is normally held in magnetically latched position by the magnetic field of the permanent magnet against the spring force and in contact with the axially inner end of the stud member carried by the first main pole piece. When a signal pulse is applied to the coil, a substantial amount of the permanent magnet flux is diverted through the shunting pole piece, permitting the biasing spring force to move the armature to a tripped position. An important feature of the construction is the fact that the plastic bobbin on which the trip coil is wound is threadedly engaged with the threaded studs carried by the oppositely disposed first and second main pole pieces whereby to hold the assembly securely together without the use of bolts or other fastening means. A further feature of the construction is the provision of a ''''built-in'''' non-magnetic gap on the movable armature member in the form of a plated coating of a non-magnetic material on the surface of the armature which engages the stud member of the first pole piece in the latched position of the armature. This ''''built-in'''' gap, insures that the movable armature and cooperating stationary magnetic structure operate at an optimum point or region on the curve of magnetic force exerted on the armature vs. gap between the armature and the axially inner end of the stud member carried by the first main pole piece.
Inventors
- 👤 D Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:10
CPC Classifications
H; H01; H01H; H01H71/00; H01H71/10; H01H71/12; H01H71/24; H01H71/32; H01H71/321; H01H71/322
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
272 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of said assembly, a magnetic first pole piece positioned axially on one side of said permanent magnet and located at one axial end of said assembly, a magnetic first stud member carried by said first pole piece and extending axially inwardly of said assembly, said first stud member being threaded, a second magnetic pole piece positioned axially on an opposite side of said permanent magnet and located at an opposite axial end of said assembly, a magnetic second stud member carried by said second pole piece and extending axially inwardly of said assembly and toward said first stud member, said second stud member being threaded, at least one of said stud members being hollow, a magnetic armature member slidably movable in the hollow interior of said one stud member, a nonmagnetic bobbin axially interposed between said first magnetic pole piece and said second magnetic pole piece, and coaxially positioned about said first stud member and said second stud member, an electrical winding carried by said bobbin, said armature normally being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, spring means normally biasing said armature away from its magnetically latched position, an electrical signal on said winding being effective to counteract the magnetic effect of said permanent magnet whereby to permit said spring to move said armature to released position, said bobbin being threaded and being in threaded engagement with said threaded first and second stud members whereby to hold said assembly in assembled relation.
Claim 2
Dependent Claim
272 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of said assembly, a magnetic first pole piece positioned axially on one side of said permanent magnet and located at one axial end of said assembly, a magnetic first stud member carried by said first pole piece and extending axially inwardly of said assembly, said first stud member being threaded, a second magnetic pole piece positioned axially on an opposite side of said permanent magnet and located at an opposite axial end of said assembly, a magnetic second stud member carried by said second pole piece and extending axially inwardly of said assembly and toward said first stud member, said second stud member being threaded, at least one of said stud members being hollow, a magnetic armature member slidably movable in the hollow interior of said one stud member, a nonmagnetic bobbin axially interposed between said first magnetic pole piece and said second magnetic pole piece, and coaxially positioned about said first stud member and said second stud member, an electrical winding carried by said bobbin, said armature normally being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, spring means normally biasing said armature away from its magnetically latched position, an electrical signal on said winding being effective to counteract the magnetic effect of said permanent magnet whereby to permit said spring to move said armature to released position, said bobbin being threaded and being in threaded engagement with said threaded first and second stud members whereby to hold said assembly in assembled relation.
Claim 3
Dependent Claim
43 words
A magnetic acutator device as defined in claim 1 in which each of said stud members is externally threaded and said bobbin has a hub member which is internally threaded, sAid threaded stud members being in threaded engagement with said threaded hub member.
Claim 4
Dependent Claim
314 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, said first stud member being threaded, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece and adapted to receive magnetic flux from said permanent magnet, said second magnetic pole piece having a central opening extending axially of said assembly, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to said central opening of said second magnetic pole piece, said second stud member being threaded, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and towards the facing axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin axially interposed between said first magnetic pole piece and said second magnetic pole piece, an electrical winding carried by said bobbin, said armature normally being held in magnetically latched position against said facing axial end of said first stud member by magnetic flux from said permanent magnet flowing through said armature and through said first stud member, an electrical signal on said winding being effective to counteract the magnetic effect of said permanent magnet on said armature whereby to permit said spring to move said armature to tripped position, said bobbin having threaded means thereon in threaded engagement with said first and second stud members whereby to hole said assembly in assembled relation.
Claim 5
Dependent Claim
314 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, said first stud member being threaded, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece and adapted to receive magnetic flux from said permanent magnet, said second magnetic pole piece having a central opening extending axially of said assembly, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to said central opening of said second magnetic pole piece, said second stud member being threaded, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and towards the facing axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin axially interposed between said first magnetic pole piece and said second magnetic pole piece, an electrical winding carried by said bobbin, said armature normally being held in magnetically latched position against said facing axial end of said first stud member by magnetic flux from said permanent magnet flowing through said armature and through said first stud member, an electrical signal on said winding being effective to counteract the magnetic effect of said permanent magnet on said armature whereby to permit said spring to move said armature to tripped position, said bobbin having threaded means thereon in threaded engagement with said first and second stud members whereby to hole said assembly in assembled relation.
Claim 6
Dependent Claim
44 words
A magnetic actuator device assembly as defined in claim 3 in which each of said stud members is externally threaded and said bobbin has a hub member which is internally threaded, said threaded stud members being in threaded engagement with said threaded hub member.
Claim 7
Dependent Claim
134 words
A magnetic actuator assembly as defined in claim 3 in which the end of said second stud member is positioned at a predetermined axial distance from said facing axial end of said first stud member whereby to define a predetermined air gap between said facing ends of said first and second stud members, said predetermined air gap being less than the axial distance between the end of said armature and said first stud member during most of the tripping travel of said armature, whereby to provide a lower reluctance shunt path for magnetic flux through said second stud member to said first stud member than through said armature to said first stud member during most of the tripping travel of said armature, thus reducing magnetic force acting on said armature during its tripping travel.
Claim 8
Dependent Claim
391 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, said first stud member being threaded, one axial end of a shunting magnetic pole piece engaging an axial end of said permanent magnet opposite said one end of said permanent magnet, said shunting pole piece being radially spaced outwardly of said first stud member to define an air gap between said shunting pole piece and said first stud member, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece, means defining A magnetic path from said shunting pole piece to said second magnetic pole piece, said second magnetic pole piece having a central opening extending in a direction axially of said assembly, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to said central opening of said second magnetic pole piece, said second stud member being threaded, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin axially interposed between said shunting pole piece and said second magnetic pole piece, said bobbin being bounded radially outwardly thereof by said means defining a magnetic path from said shunting pole piece to said second magnetic pole piece, an electrical winding carried by said bobbin, said armature normally being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said coil being effective to cause mangetic flux from said permanent magnet to bypass said armature through said shunting pole piece and said air gap to permit said spring to move said armature to released position, said bobbin having threaded means thereon in threaded engagement with said first and second stud members whereby to hold said assembly in assembled relation.
Claim 9
Dependent Claim
391 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, said first stud member being threaded, one axial end of a shunting magnetic pole piece engaging an axial end of said permanent magnet opposite said one end of said permanent magnet, said shunting pole piece being radially spaced outwardly of said first stud member to define an air gap between said shunting pole piece and said first stud member, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece, means defining A magnetic path from said shunting pole piece to said second magnetic pole piece, said second magnetic pole piece having a central opening extending in a direction axially of said assembly, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to said central opening of said second magnetic pole piece, said second stud member being threaded, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin axially interposed between said shunting pole piece and said second magnetic pole piece, said bobbin being bounded radially outwardly thereof by said means defining a magnetic path from said shunting pole piece to said second magnetic pole piece, an electrical winding carried by said bobbin, said armature normally being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said coil being effective to cause mangetic flux from said permanent magnet to bypass said armature through said shunting pole piece and said air gap to permit said spring to move said armature to released position, said bobbin having threaded means thereon in threaded engagement with said first and second stud members whereby to hold said assembly in assembled relation.
Claim 10
Dependent Claim
42 words
A magnetic acutator device assembly as defined in claim 6 in which each of said stud members is externally threaded and said bobbin has a hub member which is internally threaded said stud member being in threaded engagement with said hub member.
Claim 11
Dependent Claim
69 words
A magnetic actuator device assembly as defined in claim 6 in which at least the axial end of said armature which faces the axial end of said first stud member has a nonmagnetic plating thereon to define a shim which spaces the magnetic material of said armature a predetermined optinum axial distance from said axial end of said first stud member when said armature is in magnetically latched position.
Claim 12
Dependent Claim
391 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, said first stud member being threaded, one axial end of a shunting magnetic pole piece engaging an axial end of said permanent magnet opposite said one end of said permanent magnet, said shunting pole piece being radially spaced outwardly of said first stud member to define an air gap between said shunting pole piece and said first stud member, one axial end of a magnetic sleeve engaging an axial end of said shunting pole piece opposite said one end of said shunting pole piece, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece, said second magnetic pole piece engaging the axial end of said magnetic sleeve opposite said one end of said magnetic sleeve, said second magnetic pole piece having a central opening, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to the central opening of said second magnetic pole piece, said second stud member being threaded, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin bounded radially outwardly thereof by said magnetic sleeve, said bobbin being coaxial with said first and second stud members, an electRical winding carried by said bobbin, said armature normally being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said coil causing magnetic flux from said permanent magnet to by-pass said armature through said shunting pole and said air gap to permit said spring to move said armature to released position, said bobbin having threaded means thereon in threaded engagement with said threaded first and second stud members whereby to hold said assembly in assembled relation.
Claim 13
Dependent Claim
391 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, said first stud member being threaded, one axial end of a shunting magnetic pole piece engaging an axial end of said permanent magnet opposite said one end of said permanent magnet, said shunting pole piece being radially spaced outwardly of said first stud member to define an air gap between said shunting pole piece and said first stud member, one axial end of a magnetic sleeve engaging an axial end of said shunting pole piece opposite said one end of said shunting pole piece, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece, said second magnetic pole piece engaging the axial end of said magnetic sleeve opposite said one end of said magnetic sleeve, said second magnetic pole piece having a central opening, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to the central opening of said second magnetic pole piece, said second stud member being threaded, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin bounded radially outwardly thereof by said magnetic sleeve, said bobbin being coaxial with said first and second stud members, an electRical winding carried by said bobbin, said armature normally being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said coil causing magnetic flux from said permanent magnet to by-pass said armature through said shunting pole and said air gap to permit said spring to move said armature to released position, said bobbin having threaded means thereon in threaded engagement with said threaded first and second stud members whereby to hold said assembly in assembled relation.
Claim 14
Dependent Claim
42 words
A magnetic actuator device assembly as defined in claim 9 in which each of said stud members is externally threaded and said bobbin has a hub member which is internally threaded, said stud members being in threaded engagement with said hub member.
Claim 15
Dependent Claim
69 words
A magnetic actuator device assembly as defined in claim 9 in which at least the axial end of said armature which faces the axial end of aid first stud member has a nonmagnetic plating thereon to define a shim which spaces the magnetic material of said armature a predetermined optimum axial distance from said axial end of said first stud member when said armature is in magnetically latched position.
Claim 16
Dependent Claim
401 words
A magnetic actuator device assembly comprising an annular permanent magnet having a central opening therethrough which extends in a direction axially of said assembly, a cylindrical magnetic first pole piece engaging one axial end of said permanent magnet, a cylindrical magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, said first stud member being threaded on the external surface thereof, one axial end of a shunting magnetic pole piece of annular shape engaging an axial end of said permanent magnet opposite said one end of said permanent magnet, said shunting pole piece being radially spaced outwardly of said first stud member to define an annular air gap between said shunting pole piece and said first stud member, one axial end of an annular magnetic sleeve engaging an axial end of said shunting pole piece opposite said one end of said shunting pole piece, an annular second magnetic pole piece engaging the axial end of said annular sleeve opposite said one end of said magnetic sleeve, said annular second magnetic pole piece having a central opening extending in a direction axially of said assembly, a hollow cylindrical axially inwardly extending second magnetic stud member carried by said second magnetic pole piece in coaxial relation to the central opening of said second magnetic pole piece, said cylindrical second stud member being externally threaded, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second cyindrical stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin bounded radially outwardly thereof by said magnetic sleeve, said bobbin being coaxially positioned about said first and second stud members, an electrical winding carried by said bobbin, said armature normally being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said coil causing magnetic flux from said permanent magnet to by-pass said armature through said shunting pole and said air gap to permit said spring to move said armature to released position, said bobbin having a hollow internally threaded hub member, said threaded hub member being in threaded engagement with said externally threaded first and second stud members whereby to hold said assembly in assembled relation.
Claim 17
Dependent Claim
401 words
A magnetic actuator device assembly comprising an annular permanent magnet having a central opening therethrough which extends in a direction axially of said assembly, a cylindrical magnetic first pole piece engaging one axial end of said permanent magnet, a cylindrical magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, said first stud member being threaded on the external surface thereof, one axial end of a shunting magnetic pole piece of annular shape engaging an axial end of said permanent magnet opposite said one end of said permanent magnet, said shunting pole piece being radially spaced outwardly of said first stud member to define an annular air gap between said shunting pole piece and said first stud member, one axial end of an annular magnetic sleeve engaging an axial end of said shunting pole piece opposite said one end of said shunting pole piece, an annular second magnetic pole piece engaging the axial end of said annular sleeve opposite said one end of said magnetic sleeve, said annular second magnetic pole piece having a central opening extending in a direction axially of said assembly, a hollow cylindrical axially inwardly extending second magnetic stud member carried by said second magnetic pole piece in coaxial relation to the central opening of said second magnetic pole piece, said cylindrical second stud member being externally threaded, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second cyindrical stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin bounded radially outwardly thereof by said magnetic sleeve, said bobbin being coaxially positioned about said first and second stud members, an electrical winding carried by said bobbin, said armature normally being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said coil causing magnetic flux from said permanent magnet to by-pass said armature through said shunting pole and said air gap to permit said spring to move said armature to released position, said bobbin having a hollow internally threaded hub member, said threaded hub member being in threaded engagement with said externally threaded first and second stud members whereby to hold said assembly in assembled relation.
Claim 18
Dependent Claim
69 words
A magnetic actuator device assembly as defined in claim 12 in which at least the axial end of said armature which faces the axial end of said first stud member has a nonmagnetic plating thereon to define a shim which spaces the magnetic material of said armatUre a predetermined optimum axial distance from said axial end of said first stud member when said armature is in magnetically latched position.
Claim 19
Dependent Claim
321 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece and adapted to receive magnetic flux from said permanent magnet, said second magnetic pole piece having a central opening extending in a direction axially of said assembly, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to said central opening of said second magnetic pole piece, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin axially interposed between said first magnetic pole piece and said second magnetic pole piece, an electrical winding carried by said bobbin, said armature normally being held in mangetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said winding being effective to counteract the magnetic effect of said permanent magnet on said armature whereby to permit said spring to move said armature to released position, at least the axial end of said armature which faces the axial end of said first stud member having a nonmagnetic plating thereon to define a shim which spaces the magnetic material of said armature a predetermined optimum axial distance from said axial end of said first stud member when said armature is in magnetically latched position.
Claim 20
Dependent Claim
321 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece and adapted to receive magnetic flux from said permanent magnet, said second magnetic pole piece having a central opening extending in a direction axially of said assembly, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to said central opening of said second magnetic pole piece, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin axially interposed between said first magnetic pole piece and said second magnetic pole piece, an electrical winding carried by said bobbin, said armature normally being held in mangetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said winding being effective to counteract the magnetic effect of said permanent magnet on said armature whereby to permit said spring to move said armature to released position, at least the axial end of said armature which faces the axial end of said first stud member having a nonmagnetic plating thereon to define a shim which spaces the magnetic material of said armature a predetermined optimum axial distance from said axial end of said first stud member when said armature is in magnetically latched position.
Claim 21
Dependent Claim
420 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, one axial end of a shunting magnetic pole piece engaging an axial end of said permanent magnet opposite said one end of said permanent magnet, said shunting pole piece being radially spaced outwardly of said first stud member to define an air gap between said shunting pole piece and said first stud member, one axial end of a magnetic sleeve engaging an axial end of said shunting pole piece opposite said one end of said shunting pole piece, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece, said second magnetic pole piece engaging the axial end of said magnetic sleeve opposite said one end of said magnetic sleeve, said second magnetic pole piece having a central opening which extends in a direction axially of the assembly, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to the central opening of said second magnetic pole piece, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin bounded radially outwardly thereof by said magnetic sleeve, said bobbin being coaxial with said first and second stud members, an electrical winding carried by said bobbin, said armature normally Being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said coil causing magnetic flux from said permanent magnet to by-pass said armature through said shunting pole and said air gap to permit said spring to move said armature to released position, at least the axial end of said armature which faces the axial end of said first stud member having a nonmagnetic plating thereon to define a shim which spaces the magnetic material of said armature a predetermined optimum axial distance from said axial end of said first stud member when said armature is in magnetically latched position.
Claim 22
Dependent Claim
420 words
A magnetic actuator device assembly comprising a permanent magnet having a central opening therethrough which extends in a direction axially of the assembly, a magnetic first pole piece located at one axial end of said assembly and engaging one axial end of said permanent magnet, a magnetic first stud member carried by said first pole piece and extending axially inwardly through said central opening of said permanent magnet, one axial end of a shunting magnetic pole piece engaging an axial end of said permanent magnet opposite said one end of said permanent magnet, said shunting pole piece being radially spaced outwardly of said first stud member to define an air gap between said shunting pole piece and said first stud member, one axial end of a magnetic sleeve engaging an axial end of said shunting pole piece opposite said one end of said shunting pole piece, a second magnetic pole piece positioned at an opposite axial end of said assembly from said first pole piece, said second magnetic pole piece engaging the axial end of said magnetic sleeve opposite said one end of said magnetic sleeve, said second magnetic pole piece having a central opening which extends in a direction axially of the assembly, a hollow axially inwardly extending second stud member carried by said second magnetic pole piece in coaxial relation to the central opening of said second magnetic pole piece, a magnetic armature member slidably movable through said central opening of said second pole piece and in the hollow interior of said second stud member and toward the axial end of said first stud member, spring means biasing said armature away from said first stud member, a nonmagnetic bobbin bounded radially outwardly thereof by said magnetic sleeve, said bobbin being coaxial with said first and second stud members, an electrical winding carried by said bobbin, said armature normally Being held in magnetically latched position by magnetic flux from said permanent magnet flowing through said armature, an electrical signal on said coil causing magnetic flux from said permanent magnet to by-pass said armature through said shunting pole and said air gap to permit said spring to move said armature to released position, at least the axial end of said armature which faces the axial end of said first stud member having a nonmagnetic plating thereon to define a shim which spaces the magnetic material of said armature a predetermined optimum axial distance from said axial end of said first stud member when said armature is in magnetically latched position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |