US3895330A - Bi-level solenoid holding device - Google Patents

Bi-level solenoid holding device Download PDF

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Publication number
US3895330A
US3895330A US451542A US45154274A US3895330A US 3895330 A US3895330 A US 3895330A US 451542 A US451542 A US 451542A US 45154274 A US45154274 A US 45154274A US 3895330 A US3895330 A US 3895330A
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US
United States
Prior art keywords
plate members
latch member
holding device
hinge
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US451542A
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English (en)
Inventor
Betty Jane Yost
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LUCAS LEDEX Inc
Original Assignee
Ledex Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ledex Inc filed Critical Ledex Inc
Priority to US451542A priority Critical patent/US3895330A/en
Priority to JP12854374A priority patent/JPS5433343B2/ja
Application granted granted Critical
Publication of US3895330A publication Critical patent/US3895330A/en
Assigned to LUCAS LEDEX, INC. reassignment LUCAS LEDEX, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE JUNE 1, 1988 Assignors: LEDEX, INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/13—Electromagnets; Actuators including electromagnets with armatures characterised by pulling-force characteristics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/14—Pivoting armatures

Definitions

  • ABSTRACT A solenoid device which is capable of suspending or supporting load devices at a first load level established mechanically and a second load level established electrically comprises a ferromagnetic base plate adapted to function as a solenoid core and a ferromagnetic holding plate hinged to the base plate.
  • Spring means shaped to encircle the axis of the hinge strongly bias the holding plate against the base plate to provide a first and mechanical level for load retention.
  • a solenoid coil received in the base plate closely interfits the base plate and, when energized electrically, provides a second level of power for load retention.
  • the second level of power is rendered exceedingly efiicient by a design in which the solenoid coil, except for lead connections, is fully immersed in a ferromagnetic medium which is free of air gaps.
  • the present invention relates to solenoid holding devices and more particularly to holding devices operable at two levels, one of which is established mechanically and the other of which is established electrically.
  • An exceptionally efficient magnetic flux medium for an electromagnetic device is produced by utilizing two ferro-magnetic bodies having closely matched planar surfaces which confront and abut one another. The only interruption to the matched and abutting ferromagnetic surfaces results from the presence of an annu lar recess formed in one of the abutting ferromagnetic bodies to receive and closely interfit a solenoid coil and the further presence of a lead wire passage. The result is an electromagnetic device which is substantially free of any intervening air gap and has a high holding power.
  • An additional mechanical holding power is provided by hinging the two ferromagnetic members remotely from the aftorementioned solenoid coil and providing spring means encircling the hinge axis which resists separation of the two ferromagnetic members.
  • the spring means not only provides a second and mechanical holding power but also operates to mechanically resist the formation of an air gap between the two ferromagnetic members.
  • a further feature of the present invention is that the resulting electromagnetic structure has an exceedingly low profile and is of pleasing appearance.
  • An object of the present invention is to provide a new and improved solenoid holding structure.
  • Another object of the present invention is to provide an electromagnetic device having a maximal flux path and a minimal air gap.
  • a further object of the present invention is to provide a solenoid holding device having two levels of holding power. one established mechanically and the other established electrically.
  • FIG. 1 is a perspective view of a solenoid holding device in accordance with the present invention.
  • FIG. 2 is a section view taken substantially along the line 22 of FIG. 1.
  • FIG. 3 is a plan view with a portion broken away illustrating the base plate disassembled from the holding plate of the solenoid device.
  • FIG. 4 is an enlarged fragmentary section view taken substantially along the line 4-4 of FIG. 2.
  • the solenoid holding device comprises a base plate 10 which is of ferromagnetic material and which is shaped to have an upstanding circular boss 11 at one face thereof. Except as will be later described. the boss 11 has a planar surface and is contacted by an equally planar ferromagnetic holding plate 12.
  • the holding plate while otherwise generally circular, is formed with an outwardly extending foot 13 and diametrically oppositely therefrom an outwardly extending heel I6.
  • lugs 14 which are spaced to straddle an interdigitating hinge member 28 integral with the base plate 10 and projecting outwardly therefrom as appears in FIG. 3.
  • the hinge member 18 has a rounded upper surface 22 which permits the holding plate to swing upwardly without interfer ence from the member 18.
  • the lugs 14 are hinged to the hinge member 18 by means of a hing pin 20 which is journaled in suitable apertures formed in the lugs 14 and in a bore 21 passing through the hinge member I8.
  • the holding plate 12 is biased strongly against the planar surfaces of the boss 11 by means of a spring member 24 which comprises a single strand of wire formed as shown in FIG. 1. More particularly. the wire is formed with loops 26 to loop twice about each end of the hinge pin 20. The axially outermost loop at each end of the pin 20 terminates as a strut 28, there being a strut 28 at each end of the spring member which projects adjacent and bears against the base plate 10. The two struts 28 approach closely one to the other below and slightly to the right of the hinge pin 20 as it appears in FIG. 2.
  • the spring member 24 is also formed with a triangular and centrally located bearer portion 30 which overlies the holding plate 12 as it appears in FIG. I.
  • the spring member 24 is so formed that when assembled about the hinge pin 20 as shown in FIGS. 1 and 2, the bearer 30 strives to swing downwardly toward the struts 28 but is blocked by the holding plate I2. Likewise. the struts 28 urged by a tension generated primarily in the loops 26 strive to approach the bearer 30 but are blocked by a side margin of the base plate 10. Accordingly. the spring member 24 exerts a substantial bias pressing the holding plate 12 into faee-to-face relation with the boss 11.
  • a common application for such a latch mechanism requires the siezure ofa bomb arming ring of a size suitable that a portion of the ring can be wedged under the latch member 34.
  • the spring 24 then provides a first holding level for the retention of load elements which have been wedged under the latch member 34 and entrapped in the space between the latch member 34 and the boss 11.
  • a second and substantially larger holding force is provided by electromagnetic components which will now be described.
  • a generally toroidal channel or recess 40 having a rectangular cross section as seen in FIG. 2.
  • the open side of the channel 40 directly confronts the holding plate 12.
  • a cylindrical core 41 Remaining concentrically within the toroidal recess is a cylindrical core 41.
  • the coil 42 has been wound as a toroid having a substantially rectangular cross section.
  • the upper and lower faces of the coil are protected by insulating washers 44 which are preferably of a plastic composition. the interior edges of the washers being closely sized to the diameter of the core 4i.
  • the washers 44 are affixed to opposite faces of the coil 42 by means of a heatshrinkable tape 46 which encircles the outer periphery of the coil 42 and. when heated. so shrinks that the side edges of the tape press smoothly against the washers 44.
  • the tape 46 being heat-shrinked, the coil 42 is neatly retained in the desired toroidal shape.
  • the wire forming the coil 42 has an insulating varnish. not shown. or is otherwise insulated at its surfaces to prevent short circuits between the convolutions of the coil.
  • the use of the insulating washers 44, together with the tape 42, is for sturdiness of the coil assembly and to allow packaging and handling of the coil assemblies without damage to the surface insulation of the wire forming the coil. It will be noted. however. that it is found unnecessary to provide an insulatng tape or the like to protect the inner periphery of the coil 42.
  • a relatively shallow access trough 50 has been cut across the upper face of the boss 11. as it ap pears in FIG. 3, such as to communicate between the outer circular wall of the boss and the channel 40.
  • coil lead wires 52 protected by suitable insulation 54.
  • the lead wires 52 may be substantially greater in diameter than the wire forming the coil 42 and connected by solder or the like. not shown. to the opposite ends of the smaller wire of the coil 42.
  • the coil 42 has been so designed that a minimal amount of non-conducting material is used to protect the coil prior to its assembly into the channel 40. thus allowing a maximum number of turns of the wire forming the coil.
  • the coil 42 is provided with a complete magnetic flux path productive of an exceptionally high magnetic efficiency.
  • An examination of FIG. 2 will reveal that the coil 42 and its protective insulation together with its lead wires has. in effect, been fully immersed in a ferromagnetic medium with no air gap being present.
  • both the core 41 and the margin of the boss 11 which surrounds the coil 42 make inti mate contact with the holding plate 12 except when interrupted by the trough 50.
  • the holding device of claim 1 including spring means for biasing said plate members into face contacting relation and adapted to yield to a pivotal movement of one of said members relative to the other about the axis of said hinge means.
  • the holding device of claim 2 including a latch member affixed to one of said plate members, the other of said plate members having a cavity to receive said latch member.
  • said latch member and said cavity adapted to retain a load'when said plate members are in face contacting relation, said latch member separable from said cavity to release the load upon a pivotal separation of said plate members against the bias of said spring means.
  • said spring means comprises a spring wire at least a portion of which is coiled about said hing pin.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
US451542A 1974-03-15 1974-03-15 Bi-level solenoid holding device Expired - Lifetime US3895330A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US451542A US3895330A (en) 1974-03-15 1974-03-15 Bi-level solenoid holding device
JP12854374A JPS5433343B2 (ja) 1974-03-15 1974-11-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US451542A US3895330A (en) 1974-03-15 1974-03-15 Bi-level solenoid holding device

Publications (1)

Publication Number Publication Date
US3895330A true US3895330A (en) 1975-07-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US451542A Expired - Lifetime US3895330A (en) 1974-03-15 1974-03-15 Bi-level solenoid holding device

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US (1) US3895330A (ja)
JP (1) JPS5433343B2 (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4941235A (en) * 1988-10-14 1990-07-17 Application Art Laboratories Co., Ltd. Magnetic lock closure device
US4991270A (en) * 1988-01-27 1991-02-12 Application Art Laboratories Co., Ltd. Magnetic lock closure
US5125134A (en) * 1985-12-27 1992-06-30 Tamao Morita Magnetic fastener
US5192155A (en) * 1992-04-20 1993-03-09 The United States Of America As Represented By The United States Department Of Energy Magnetic gripper device
EP0778592A3 (en) * 1995-12-07 1998-03-04 Eaton Corporation Electromagnetic actuator having a low aspect ratio stator
US5807019A (en) * 1996-09-09 1998-09-15 Meyer; Ross E. Magnetic gripper device
WO2007016985A1 (en) * 2005-07-28 2007-02-15 Tripco Limited An electromagnetic actuator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008062161A (ja) * 2006-09-06 2008-03-21 Eacle Kk シックナー

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591520A (en) * 1948-03-19 1952-04-01 Fligue Wladimir De Electromagnetic relay or contactor
US3476223A (en) * 1968-01-17 1969-11-04 Motor Wheel Corp Electromagnet
US3521209A (en) * 1967-02-21 1970-07-21 Lothar Fritz Electromagnetic load lifting device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591520A (en) * 1948-03-19 1952-04-01 Fligue Wladimir De Electromagnetic relay or contactor
US3521209A (en) * 1967-02-21 1970-07-21 Lothar Fritz Electromagnetic load lifting device
US3476223A (en) * 1968-01-17 1969-11-04 Motor Wheel Corp Electromagnet

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5125134A (en) * 1985-12-27 1992-06-30 Tamao Morita Magnetic fastener
US4991270A (en) * 1988-01-27 1991-02-12 Application Art Laboratories Co., Ltd. Magnetic lock closure
US4941235A (en) * 1988-10-14 1990-07-17 Application Art Laboratories Co., Ltd. Magnetic lock closure device
US5192155A (en) * 1992-04-20 1993-03-09 The United States Of America As Represented By The United States Department Of Energy Magnetic gripper device
EP0778592A3 (en) * 1995-12-07 1998-03-04 Eaton Corporation Electromagnetic actuator having a low aspect ratio stator
US5807019A (en) * 1996-09-09 1998-09-15 Meyer; Ross E. Magnetic gripper device
WO2007016985A1 (en) * 2005-07-28 2007-02-15 Tripco Limited An electromagnetic actuator

Also Published As

Publication number Publication date
JPS5433343B2 (ja) 1979-10-19
JPS50125157A (ja) 1975-10-01

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Date Code Title Description
AS Assignment

Owner name: LUCAS LEDEX, INC.

Free format text: CHANGE OF NAME;ASSIGNOR:LEDEX, INC.;REEL/FRAME:004985/0378

Effective date: 19880531