US3815065A - Magnetic armature for magnetic arrangements subject to impact stresses - Google Patents

Magnetic armature for magnetic arrangements subject to impact stresses Download PDF

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Publication number
US3815065A
US3815065A US00313692A US31369272A US3815065A US 3815065 A US3815065 A US 3815065A US 00313692 A US00313692 A US 00313692A US 31369272 A US31369272 A US 31369272A US 3815065 A US3815065 A US 3815065A
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Prior art keywords
armature
magnetic
head
magnet
piston
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Expired - Lifetime
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US00313692A
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English (en)
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W Hadam
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Individual
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Individual
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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
    • H01F7/088—Electromagnets; Actuators including electromagnets with armatures provided with means for absorbing shocks

Definitions

  • a magnetic armature particularly adapted for use with magnet devices which are subject to impact, such as, electro-retaining magnets for knitting machines, includes a magnetic armature head of relatively small mass which is resiliently connected to a magnetic armature body of larger mass.
  • the resilient connection can be provided by a spring or by an intermediate member such as a rubber connector rigidly secured to both the armature head and body.
  • the present invention relates to a magnetic armature particularly adapted for use in magnetic apparatus subject to impact stresses.
  • the invention is applicable to electro-retaining magnets of knitting machines, wherein the magnet armatures are connected to movable members of relatively large mass.
  • the tractive force of a magnet that is, the force of the magnetic field created by a magnet, drops very sharply as the armature is moved from the corresponding magnetic core or. magnetic poles. Further, the strength of the magnetic field which'is required to attract a released armature is a multiple of the force of the magnetic field required to hold or retain an armature in; position. For. this reason, an electromagnet,
  • the present invention concerns the provision of an improved magnetic armature adapted to seat against or engage the magnetic core or pole shoes of a magnet, which armature comprises a magnetic head" of a relatively small mass which is resiliently connected to a magnetic armature body of a larger mass.
  • the resilient connection may be implemented so that the connection is stressed in one direction only or is stressed in both directions. In the latter instance, the
  • magnetic armature head may be resiliently connected to the armature body for free movement, this, for example, being achieved by an intermediate connecting layer between the magnetic armature head and the armature body which is resiliently deformable under strain or compression.
  • the magnetic armature body need not necessarily be a separate entity but can, where appropriate, comprise a machine part which is magneticallyresponsive and which is of any required form, the machine part being resiliently connected to a corresponding magnetic armature head.
  • Magnetic armatures constructed in accordance with this invention may advantageously be used in various fields including electrical control systems for knitting machines in which the armatures of the electromagnets, and'particularly the electro-retaining magnets, are connected to movable members of relatively large mass and hence subject to impact loads.
  • a movable member can, for example, take the form of a rod or bolt or be provided with a bolt which is mounted for movement towards a retaining magnet against spring bias and is provided with a resiliently connected armature head adapted to be applied against the magnet.
  • FIG. 1 is a simplified, diagrammatic, side elevational view of a magnetic armature constructed in accordance with the principles of the invention
  • FIG. 2 is aside elevational view, partially in section, of one practical embodiment of the improved magnetic armature of the invention
  • FIG. 3' is a side elevational view, similar to that of FIG. 2, of a second practical embodiment of the invention.
  • FIG. 4 is a fragmentary, part sectional, side elevatio'nal view of a flat knitting machine which incorporates a magnetic armature of the form depicted in FIG. 2;
  • FIG. 5 is a part-sectional view taken along line V V of FIG. 4.
  • FIG. 1 a simplified version of the armature of the invention is shown which illustrates the principles underlying the invention.
  • a magnetic armature is broken into a magnetic armature head 10 of a small mass, denoted m and an armature body 11, of a larger residual mass m, and a spring 12 is used to connect the head 10 and the body 12 together.
  • the face of the armature, denoted 101 is provided on the armature head 10 and is applied against a pair of pole shoes denoted l3 and 14. (Alternatively, as discussed above, the armature surface can be applied against the core of an electromagnet.)
  • the braking up of the armature into separate, resiliently connected masses provides substantially improved impact resistance capabilities.
  • the armature body of the larger mass m is constituted by a bolt 111 which is movable in the directions of the double arrow and is provided at its magnet end with a piston 16.
  • a hollow'cylindrical shank 102 of an armatureplate 110 is received in thecylinder 17, plate 110 corresponding to the armature head 10 of smaller mass shown in FIG. 1.
  • the face 101 of the plate 110 is applied against, or engages, a magnet which generally designated 18 in FIG. 2.
  • a compression spring 112 Arranged within the cylinder 17 and the concentric cylindrical shank 102 of the magnetic plate 110 is a compression spring 112 which bears at one end against the piston 16 and at the other end against the rear or inner side of the plate 110.
  • the compression spring 112 constitutes the resilient coupling between the bolt 11] (of larger mass m and the armature plate 110 (of smaller mass m) and is only effective from the rest position when the bolt 111 moves towards the electromagnet 18.
  • the arrangement of the cylinder 17 and the magnetic plate 110 is, however, so constructedthat a limited degree of pivoting thereof relatively to the longitudinal axis of the bolt 111 can take place so that the abutment face 101 of the plate 110 is flush against the pole shoes of the electromagnet 18 when the magnetic armature is energized.
  • This construction enables very exact distance and length tolerances to be achieved and affords a high degree of security against the effects of impacts exerted on the bolt Ill, principally in the direction towards the electromagnet 18.
  • a magnetic armature head in the form of a plate 210, is freely or universally movable and is coupled resiliently to a magnetic armature body 211 for every direction of movement.
  • This coupling is effected by an intermediate resilient body 212, whichis i preferably constructed of rubber and which is accordingly in the nature of a rubber spring.
  • the rubber body 212 is rigidly connected by suitable means, such as an adhesive or vulcanization, to both the magnetic annature head 210 and the armature body 211.
  • the rubber body 212 may be stressed in tension or compression, the arrangement shown in FIG. 3 affording protection against impact in every direction.
  • the magnetic armature head 210 is constructed in plate form to enable seating against the pole shoes of the electromagnet 18 and can be connected to the rubber body 212 in a preliminary operation to constitute a unitary structure which is subsequently connected to the magnetic armature body 211.
  • the latter may be of any desired 4 shape, although in this embodiment, attention must be paid to certain longitudinal tolerances of the overall system during the mechanical movement of the magnetic armature. 1
  • FIGS. 4 and 5 there are shown, in somewhat diagrammatical form, magnetic armatures of the type illustrated in FIG. 2, together with associated retaining magnets, incorporated in the machine carriage is caused to travel over needle bed 19 in a known manner.
  • a plurality of electromagnets 18 are arranged in the mountingplate 21, although. for simplicity, only two such electromagnets have been illustrated.
  • the electromagnets 18 are provided with magnetic armatures of a form corresponding to that illustrated in FIG. 2, and hence include a bolt-form magnetic armature body 111 and a magnetic armature plate of relatively smaller mass which is resiliently coupled thereto.
  • the bolts 111 are each provided with a vertically movable sliding shoe 24 at the end thereof opposite to the corresponding magnet 18.
  • Each of the bolts 11] (and its associated shoe 24) is held against the cam bar 20 by means of a compression spring 25 when the magnet 18 is de-energized.
  • the compression springs 25 surround the bolts 111 and are interposed between the underside of the guide plate 22 and the upper ends of the shoes 24.
  • the cam bar 20 produces a continuously repeating presentation of a magnetic armature against its associated electromagnet 18'by causing the armature plate 110 to move into contact with the pole of that magnet.
  • the magnet system comprises a permanent magnet with soft iron pole shoes which can be strengthened by electrical energization through a coil providing a permanent magnetic field and can be weakened by a controllable counteracting field to release the spring-biased armature. Impacts, which in this case take place principally in a direction away from the magnetic armature body 111 and towardsthe electromagnet 18, cannot bring about release of the magnetic armature because of the resilient arrangement of the magnetic armature plate.
  • a magnetic armature for magnet devices subject to impact wherein the face of the armature is positioned against the magnetic means of the magnet device which attracts the armature, said armature comprising a magnetic armature head of relatively small mass which lies adjacent to the magnetic means and abuts the magnetic means upon energization of the magnetic device, a magnetic armature body of a larger mass relatively remote from themagnetic means and means for resiliently connecting said armature head to said armature body.
  • a magnetic armature as claimed in claim 2 wherein said resilient connecting means comprising an intermediate resilient member located between said armature head and said armature bodyfor rigidly connecting said armature head to said armature body, said member being resiliently deformable under tension and compression.
  • a magnetic armature as claimed in claim 1 wherein said magnetic armature comprises a rod-like member including a piston connected to the end thereof towards the magnetic device, said armature further including a cylinder connected to the armature head into which said piston projects and said piston including an abutment for limiting the axial movement thereof within said cylinder, said resilient means conprising a compression spring located between said piston and said head.
  • a magnetic armature as claimed in claim 1 in combination with needle selection system including electro-retaining magnets, wherein the said armature body comprises a movable bolt member, said system including means for mounting said bolt member for movement towards a corresponding retaining magnet, said spring means for opposing the movement of said bolt member, said armature head being resiliently held in abutment against said magnet.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Knitting Machines (AREA)
US00313692A 1971-12-10 1972-12-11 Magnetic armature for magnetic arrangements subject to impact stresses Expired - Lifetime US3815065A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2161377A DE2161377A1 (de) 1971-12-10 1971-12-10 Magnetanker fuer unter stossbelastung stehende magnetanordnungen

Publications (1)

Publication Number Publication Date
US3815065A true US3815065A (en) 1974-06-04

Family

ID=5827637

Family Applications (1)

Application Number Title Priority Date Filing Date
US00313692A Expired - Lifetime US3815065A (en) 1971-12-10 1972-12-11 Magnetic armature for magnetic arrangements subject to impact stresses

Country Status (7)

Country Link
US (1) US3815065A (OSRAM)
JP (1) JPS5245032B2 (OSRAM)
CH (1) CH539326A (OSRAM)
DE (1) DE2161377A1 (OSRAM)
FR (1) FR2162524B3 (OSRAM)
GB (1) GB1387680A (OSRAM)
IT (1) IT971126B (OSRAM)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038837A (en) * 1975-07-24 1977-08-02 Jumberca, S.A. Needle selection mechanism for knitting machines
DE3132396A1 (de) * 1981-08-17 1983-03-03 Schultz, Wolfgang E., Dipl.-Ing., 8940 Memmingen "elektromagnet"
US4429553A (en) 1980-06-13 1984-02-07 Atelier De Construction Steiger S.A. Cam-support carriage for a knitting machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2644285B1 (fr) * 1989-03-08 1994-07-01 Itt Composants Instr Relais electromagnetique, notamment pour la commande d'un disjoncteur ou d'un interrupteur differentiel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935663A (en) * 1958-04-04 1960-05-03 Manfred J Pollak Magnetic actuators
US3564870A (en) * 1968-06-22 1971-02-23 Heinz Glaunsinger Electromagnetic actuator for a circular knitting machine
US3621422A (en) * 1969-12-19 1971-11-16 Thrust Inc Magnetic actuator
US3713059A (en) * 1970-12-05 1973-01-23 Hosiden Electronics Co Solenoid operated plunger device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935663A (en) * 1958-04-04 1960-05-03 Manfred J Pollak Magnetic actuators
US3564870A (en) * 1968-06-22 1971-02-23 Heinz Glaunsinger Electromagnetic actuator for a circular knitting machine
US3621422A (en) * 1969-12-19 1971-11-16 Thrust Inc Magnetic actuator
US3713059A (en) * 1970-12-05 1973-01-23 Hosiden Electronics Co Solenoid operated plunger device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038837A (en) * 1975-07-24 1977-08-02 Jumberca, S.A. Needle selection mechanism for knitting machines
US4429553A (en) 1980-06-13 1984-02-07 Atelier De Construction Steiger S.A. Cam-support carriage for a knitting machine
DE3132396A1 (de) * 1981-08-17 1983-03-03 Schultz, Wolfgang E., Dipl.-Ing., 8940 Memmingen "elektromagnet"

Also Published As

Publication number Publication date
IT971126B (it) 1974-04-30
JPS4865456A (OSRAM) 1973-09-08
FR2162524A1 (OSRAM) 1973-07-20
GB1387680A (en) 1975-03-19
JPS5245032B2 (OSRAM) 1977-11-12
FR2162524B3 (OSRAM) 1976-01-09
CH539326A (de) 1973-07-15
DE2161377A1 (de) 1973-06-14

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