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This is a record of a document published elsewhere, first published by the United States Patent and Trademark Office, as US-5038128-A, on 6 August 1991. OpenTechnical did not first disclose it. The identifier, hashes and timestamps below record what this library served and when, not when the material became public. View the original.

OT-2026-000003419

Magnetic gripper

Published
Permanent URL
Classification
Lifting, Positioning & Manipulation › Hoists and Cranes
Inventors
GEORGIEV ASSEN G, GEORGIEV VALENTIN G, STOEV PLAMEN D, STOJANOV STOJAN D, ZANEV ZANTCHO B
Assignee
P S P METALSNAB
Original source
US-5038128-A, the United States Patent and Trademark Office, 6 August 1991
Document SHA-256
0297e830f8a8f7476dc021f9eb4c71b3a7a741aaf32e49d052b54172519b20c9

A magnetic gripper avoiding the disadvantages of the well-known devices of reduced lifting capacity, increased electric power consumption and small gripping force finds application in mechanical engineering for the transportation of ferromagnetic materials. The device has a U-shaped casing of magnetic soft material, at least two pairs of permanent magnets, one of their ends resting on the casing and the other on a common pole terminal enveloped in a neutralizing winding and all magnets are enveloped by a magnetizing winding. The magnetic gripper can lift thick sheets and packs of thin sheets when short-time current pulse of the magnetizing winding is fed and the permanent magnets are magnetized in one direction, the magnetic flux formed is collected in the common pole terminal. To free the sheets, a current pulse of the common neutralizing winding is fed and the direction of magnetization is reversed. For the regulation of the gripping force in some sectors of the poles, the magnetic flux is summed and in others is subtracted, thus achieving changes of the gripping force on a wide range with reduced energy consumption.

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Abstract

A magnetic gripper avoiding the disadvantages of the well-known devices of reduced lifting capacity, increased electric power consumption and small gripping force finds application in mechanical engineering for the transportation of ferromagnetic materials. The device has a U-shaped casing of magnetic soft material, at least two pairs of permanent magnets, one of their ends resting on the casing and the other on a common pole terminal enveloped in a neutralizing winding and all magnets are enveloped by a magnetizing winding. The magnetic gripper can lift thick sheets and packs of thin sheets when short-time current pulse of the magnetizing winding is fed and the permanent magnets are magnetized in one direction, the magnetic flux formed is collected in the common pole terminal. To free the sheets, a current pulse of the common neutralizing winding is fed and the direction of magnetization is reversed. For the regulation of the gripping force in some sectors of the poles, the magnetic flux is summed and in others is subtracted, thus achieving changes of the gripping force on a wide range with reduced energy consumption.

1. Drawings

[0001]Sheet 1.

[0002]Sheet 2.

Publication information

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Citation

OpenTechnical Publication OT-2026-000003419, “Magnetic gripper,” published September 15, 2026 at 20:25:27 UTC, https://opentechnical.org/p/OT-2026-000003419.

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