Buckles – buttons – clasps – etc. – Having magnetic fastener
Patent
1995-11-06
1997-11-04
Cuomo, Peter M.
Buckles, buttons, clasps, etc.
Having magnetic fastener
224183, 24DIG29, A44B 2100
Patent
active
056826532
DESCRIPTION:
BRIEF SUMMARY
This invention relates to magnetic fastening devices of the kind having two magnetic attraction members which attract one another magnetically through an interposed object, which may be an object to be held by the device or an object to which the device is to be held.
In particular, but not exclusively, the invention relates to a fastening device of the kind comprising two magnetically attractive cooperating limbs which are interconnected by a hinge member, at least one of the limbs comprising a magnetic attraction member, the magnetic attraction member of at least one limb comprising a permanent magnet.
Examples of fastening devices of this kind are disclosed in SE-B-453 620, U.S Pat. No. 4,258,493 and EP-A-0 029 500. The first-mentioned patent publication discloses a fastening device in which the hinge member is a ligament in the shape of a short flexible plastic strip the ends of which are attached to the peripheral portions of a pair of flat circular permanent magnets. U.S. Pat. No. 4,258,953 shows a similar fastening device. EP-A-0 029 500 shows a fastening device in which the hinge member includes a hinge pin which is attached to one of the limbs and journalled in the other limb.
An object of the invention is to provide a fastening device of the aforesaid kind which can be produced in a simple and economical manner.
It is also an object of the invention to provide a magnetic fastening device which can efficiently utilize the magnetism of the permanent magnet or magnets so that a strong holding power can be attained with small-sized and hence light-weight permanent magnets.
Low weight is particularly important if the fastening device is used for name tags, campaign buttons and similar objects attached to articles of clothing.
According to one aspect of the invention there is provided a fastening device of the kind comprising two magnetically attractive cooperating limbs which are interconnected by a hinge member, each limb including a magnetic attraction member, the magnetic attraction member of at least one of the limbs comprising a permanent magnet, wherein the hinge member forms an elongate tubular sheath which is made of nonmagnetic material and tightly encloses the magnetic attraction members of both limbs.
According to another aspect of the invention there is provided a fastening device of the kind comprising two magnetic attraction members, at least one of the magnetic attraction members comprising a permanent magnet, wherein at least said one magnetic attraction member is tightly enclosed by a tubular sheath of nonmagnetic material.
According to a further aspect of the invention there is provided a magnetic fastening device comprising a magnetic attraction member including a backing plate of magnetically soft material and at least one permanent magnet body assembled with the backing plate so as to engage one face of the backing plate, and a tubular sheath of nonmagnetic material which tightly encloses the magnetic attraction member.
Other objects, features and advantages will become apparent from the following description of a representative exemplary embodiment shown in the accompanying drawing, in which:
FIG. 1 is a perspective view of a magnetic fastening device embodying the principles of the invention, the fastening device being illustrated in an open position with portions of the sheath being broken away; and
FIG. 2 is a longitudinal sectional view of the fastening device in FIG. 1 shown in a closed or holding position with an object clamped between the opposed magnetic attraction members.
Referring to the drawing, the exemplary fastening device comprises two cooperating magnetic attraction members 11 and 12 and an elongate interconnecting member which forms a tubular sheath 13 that interconnects and tightly encloses the two members.
Each member 11, 12 comprises an assembly of an elongate rectangular pole-piece or backing plate 14 of a magnetically soft material and a pair of permanent magnets 16, 17 positioned on one face of the plate and being in the shape of thin flat circular discs o
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Berglof Fredrik
Berglof Patrik
Cuomo Peter M.
Sandy Robert J.
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