Magnetic attachment system having a non-magnetic region

• US 8,354,909 B2
• Filed: 05/21/2012
• Issued: 01/15/2013
• Est. Priority Date: 04/04/2008
• Status: Active Grant

• Current Assignee: Correlated Magnetics Research, LLC
• Original Assignee: Correlated Magnetics Research, LLC
• Inventors: Fullerton, Larry W., Roberts, Mark, Richards, James Lee
• Primary Examiner(s): BARRERA, RAMON M
• Application Number:
  US13/476,246
• Publication Number:
  US 20120229236A1
• Time in Patent Office: 239 Days
• Field of Search: 335/285, 335302-306, 243/03
• US Class Current: 335/285
• CPC Class Codes: G09F 7/04 the elements being secured or adapted to be secured by magnetic means
• CPC Class Codes: H01F 7/0263 Closures, bags, bands, engagement devices with male and female parts
• CPC Class Codes: Y10T 24/32 having magnetic fastener
• CPC Class Codes: Y10T 29/49826 Assembling or joining
• CPC Class Codes: Y10T 29/4998 Combined manufacture including applying or shaping of fluent material

Abstract

A magnetic attachment system for attaching a first object to a second object. A first magnet structure is attached to the first object and a second magnet structure is attached to the second object. The first and second objects are attached by virtue of the magnetic attraction between the first magnet structure and second magnet structure. The magnet structures comprise magnetic elements arranged in accordance with patterns based on various codes. In one embodiment, the code has certain autocorrelation properties. In further embodiments the specific type of code is specified. In a further embodiment, an attachment and a release configuration may be achieved by a simple movement of the magnet structures. In a further embodiment, the magnetic pattern may include a non-magnetic region.

Claims

1. A detachable cover attachment system comprising:

a base structure; and

a removable cover, said removable cover capable of being attached to said base structure by magnetic force interaction between said base structure and said removable cover;

said base structure comprising a base structure attachment section, said base structure attachment section comprising a first plurality of magnetic field sources, said first plurality of magnetic field sources having a plurality of north magnetic polarities and a plurality of south magnetic polarities, said base structure attachment section having at least one base structure non-magnetic region disposed between at least two magnetic field sources of said first plurality of magnetic field sources, wherein said base structure non-magnetic region does not substantially produce a magnetic field; and

said removable cover comprising a cover attachment section, said cover attachment section comprising a second plurality of magnetic field sources, said second plurality of magnetic field sources having a plurality of north magnetic polarities and a plurality of south magnetic polarities, said cover attachment section comprising at least one cover attachment non-magnetic region disposed between at least two magnetic field sources of said second plurality of magnetic field sources, wherein said cover attachment non-magnetic region does not substantially produce a magnetic field, said base structure attachment section and said cover attachment section being movable relative to each other along a linear range of positions corresponding to a linear spatial force function, said linear spatial force function for said linear range of positions comprising one and only one peak attract spatial force and a plurality of off-peak spatial forces, said plurality of off-peak spatial forces having a greatest off-peak spatial force, wherein said peak attract spatial force for said linear range of positions is between three and five times the greatest off-peak spatial force.

2. The detachable cover attachment system of claim 1, wherein said magnetic force interaction between said base structure and said removable cover is generated by neodymium iron boron.

3. The detachable cover attachment system of claim 1, wherein said base structure attachment section and said cover attachment section are movable relative to each other along a range of rotational positions around an axis, said axis being perpendicular to an interface boundary between said base structure attachment section and said cover attachment section when said base structure attachment section and said cover attachment section are aligned in a position that generates said peak attract spatial force.

4. The detachable cover attachment system of claim 1, wherein said magnetic force interaction between said base structure and said removable cover is generated at least in part by an electromagnet.

5. The detachable cover attachment system of claim 1, wherein said magnetic force interaction between said base structure and said removable cover is generated at least in part by magnetic material comprising samarium cobalt.

6. The detachable cover attachment system of claim 1, wherein said magnetic force interaction between said base structure and said removable cover is generated at least in part by magnetic material comprising ferrite.

7. The detachable cover attachment system of claim 2, wherein said first plurality of magnetic field sources is a single contiguous piece of permanent magnet material.

8. The detachable cover attachment system of claim 2, wherein said first plurality of magnetic field sources is two discrete pieces of permanent magnet material.

9. The detachable cover attachment system of claim 2, wherein said first plurality of magnetic field sources is comprised of exactly four discrete pieces of permanent magnet material.

10. The detachable cover attachment system of claim 2, wherein said first plurality of magnetic field sources is comprised of exactly six discrete pieces of permanent magnet material.

11. The detachable cover attachment system of claim 2, wherein said first plurality of magnetic field sources is comprised of more than two discrete pieces of permanent magnet material.

12. The detachable cover attachment system of claim 2, wherein the base structure attachment section is comprised of first and second base structure patterned magnetic regions, wherein each of said first and second base structure patterned magnetic regions consists of four base structure magnetic field sources of approximately equal surface area, wherein said base structure non-magnetic region is disposed between said first and second base structure patterned magnetic regions, wherein at least one of said four base structure magnetic field sources has a north polarity, and wherein at least one of said four base structure magnetic field sources has a south polarity, and wherein at least one of said base structure magnetic field sources is adjacent to another of said base structure magnetic field sources having the same polarity, and wherein the cover attachment section is comprised of first and second cover attachment patterned magnetic regions, wherein each of said first and second cover attachment patterned magnetic regions consists of four cover patterned magnetic field sources of approximately equal surface area, wherein said cover attachment non-magnetic region is disposed between said first and second cover attachment patterned magnetic regions, wherein at least one of said four cover patterned magnetic field sources has a north polarity, and wherein at least one of said four cover patterned magnetic field sources has a south polarity, and wherein at least one of said cover patterned magnetic field sources is adjacent to another of said cover patterned magnetic field sources having the same polarity.

13. The detachable cover attachment system of claim 12, wherein said at least one of said cover patterned magnetic field sources adjacent to another of said cover patterned magnetic field sources having the same polarity is contained in a single contiguous piece of magnet material with said another of said cover patterned magnetic field sources.

14. The detachable cover attachment system of claim 12, wherein the first cover attachment patterned region and the first base structure patterned regions are movable along a range of relative positions, and for said range of relative positions, a magnetic force interaction between said first base structure patterned magnetic region and said first cover attachment patterned magnetic region corresponds to a patterned spatial force function, and said patterned spatial force function for said range of relative positions comprising a peak spatial force and a plurality of off-peak spatial forces, wherein said peak spatial force for said range of relative positions is between three and five times a maximum off-peak spatial force of said plurality of off-peak spatial forces.

15. The detachable cover attachment system of claim 12, wherein the second cover attachment patterned magnetic region and the second base structure patterned magnetic region are movable along a range of relative positions, and for said range of relative positions, a magnetic force interaction between said second base structure patterned magnetic region and said second cover attachment patterned magnetic region corresponds to a patterned spatial force function, and said patterned spatial force function for said range of relative positions of said second base structure patterned magnetic region and said second cover attachment patterned magnetic region comprises a peak spatial force and a plurality of off-peak spatial forces, wherein said peak spatial force for said range of relative positions for said second base structure patterned region and said second cover attachment patterned region is between three and five times a maximum off-peak spatial force of said plurality of said off-peak spatial forces.

16. The detachable cover attachment system of claim 12, wherein said cover attachment patterned magnetic region comprises a magnetic force interaction between a first portion being a portion of the first base structure patterned magnetic region on said base structure attachment section and a second portion being a portion of the first cover attachment patterned magnetic region on said cover attachment section, and wherein said first portion and said second portion correspond to a portion spatial force function, said portion spatial force function having a range of relative positions between said first portion and said second portion along one dimension comprises a peak spatial force and a plurality of off-peak spatial forces, wherein said peak spatial force for said range of relative positions along one dimension is between three and five times a maximum off-peak spatial force of said plurality of off-peak spatial forces.

17. A method for assembling a magnetic attachment mechanism, said method comprising:

affixing to a substantially linear holding structure a plurality of pieces of neodymium iron boron magnetic material, said plurality of pieces of neodymium iron boron magnetic material comprising a first plurality of magnetic field sources, each magnetic field source of said first plurality of magnetic field sources having a polarity, said first plurality of magnetic field sources configured such that said magnetic attachment mechanism is capable of generating a peak attract force, a plurality of off-peak repel forces, and a plurality of off-peak attract forces when said magnetic attachment mechanism is exposed to a second plurality of magnetic field sources moved laterally along the length of said linear holding structure, said first plurality of magnetic field sources being complementary to said second plurality of magnetic field sources, each off-peak attract force of said plurality of off-peak attract forces being less than one-half the strength of said peak attract force, and each off peak repel force of said plurality of off-peak repel forces being less than one-half of said peak attract force; and

positioning said linear holding structure and said plurality of pieces of neodymium iron boron magnets comprising said first plurality of magnetic field sources in a compartment, wherein the compartment substantially restricts movement of said linear holding structure in at least two dimensions.

18. The method of claim 17, further comprising:

affixing a spring to said substantially linear holding structure to control movement of said substantially linear holding structure.

19. The method of claim 17, wherein an adhesive is used to affix said substantially linear holding structure to said plurality of pieces of neodymium iron boron magnetic material.

20. The method of claim 17, wherein said linear holding structure is ferromagnetic.