| Claims
[1] A small-sized demagnetizer, comprising a handle, a case secured to the front of the handle and formed with a long and narrow receiving chamber, a long E-core disposed in the receiving chamber and formed with a plurality of parallel engagement protrusions, a plurality of bobbins secured to the engagement protrusions of the E-core, each of the bobbins having coils wound therearound, and a temperature sensor and a switch disposed adjacent to the handle so as to allow the coils of the bobbins to be connected with an electric wire. |
Description SMALL-SIZED DEMAGNETIZER
Technical Field
[1] The present invention relates to a small-sized demagnetizer, and more particularly, to a small-sized demagnetizer, which is easy to handle, and can easily perform the demagnetization of a deep place of a device or a part or a product positioned at a narrow space. Background Art
[2] In general, with regard to a portable demagnetizer, there has been disclosed Korean
Patent Registration No. 119374, in which a large transformer is disposed in a rectangular case with a handle to provide an alternative magnetic force sufficient to perform the demagnetization, and it is evaluated to be used more conveniently in comparison with a conventional table type demagnetizer.
[3] However, since the demagnetizer as constructed above uses a large transformer to obtain sufficient alternative current required at the time of demagnetization, it is not only inconvenient to handle due to its weight that weighs about 5-6D, but it is difficult to handle if the handle is made long as long as the weight is heavy, so that the length of the handle is made short. Also, the conventional demagnetizer encounters several problems in that it is difficult to reach a deep place when it is used for the demagnetization of a mold of a press or the like, and it became impossible to enter between the narrow guide pins of the mold because a width of a demagnetization portion is wide in terms of features of the shape, so that the mold should be dissembled to enable the demagnetization to cause damage of the mold during the process and reduction of the work time, resulting in a reduction of the productivity and the like. Disclosure of Invention Technical Problem
[4] Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and a primary object of the present invention is to provide a small-sized demagnetizer which is made light to thereby facilitate its handling, and is capable of providing a narrow and long demagnetization portion, so that it is possible to perform the demagnetization of the mold or the product positioned at a deep place or a narrow place of the set device to thereby prevent damage of parts and remove a concern about a decrease of the productivity due to demagnetization.
[5] The above object of the present invention can be accomplished by the small-sized demagnetizer, in which several bobbins with coils wound therearound are disposed in a long case, which is connected to the front of a handle, via an integral-type long E-core,
so that it can be turned on/off by a switch and a temperature sensor. Technical Solution
[6] To achieve the above object, the present invention provides a small-sized de- magnetizer, comprising a case secured to the front of a handle and formed with a long and narrow receiving chamber, a long E-core disposed in the receiving chamber and formed with a plurality of parallel engagement protrusions, a plurality of bobbins secured to the engagement protrusions of the E-core, each of the bobbin having coils wound therearound, and a temperature sensor and a switch disposed adjacent to the handle so as to allow the coils of the bobbins to be connected with an electric wire.
Advantageous Effects
[7] Thus, the present invention is easy in fabrication because a plurality of small bobbins 8 with coils wound therearound are disposed in a long case 4 by using a long E-core 6, and is easy to handle because it can be made light because it is possible to obtain sufficient alternative current required for the demagnetization.
[8] Also, according to the present invention, since the plurality of bobbins 8 with coils wound therearound can minimize the width of the demagnetization portion of the case 4 when they are disposed in a line and can lengthen the demagnetization portion from the handle 2 by increasing the number of the bobbins or making them biased forward, it is possible to perform demagnetization of the part or the product positioned at deep place or between narrow gaps of the device at the set state so that damage of the part or the reduction of the productivity due to demagnetization can be prevented, or the like.
Brief Description of the Drawings
[9] FIG. 1 is a perspective view of the present invention;
[10] FIG. 2 is a perspective view of a bottom surface of the present invention;
[11] FIG. 3 is an exploded perspective view of the present invention; and
[12] FIG. 4 is a circuit diagram of the present invention.
[13] <Explanation on the numerals of the principal portions of the Drawing>
[14] 2; handle 4; case
[15] 4a; engagement portion 4b; receiving chamber
[16] 6; E-core 6a; engagement protrusion
[17] 8; bobbin 10; temperature sensor
[18] 12; switch
Mode for the Invention [19] Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the appended drawings. [20] FIG. 1 is a perspective view of the present invention, and FIG. 2 is a perspective view of a bottom surface of the present invention. As shown in the drawings, the
present invention comprises a handle 2, a case 4 engaged and secure to the handle, a long E-core 6 secured to a lower receiving chamber of the case, a plurality of bobbins 8 secured in parallel with the E-core 8, and a temperature sensor 10 and a switch 12 disposed at the rear side of the case.
[21] The handle 2 is formed to be long and thick easy to grasp with one hand, and is formed with a through-hole at the inside thereof so that an electric power supply line can be connected with it via the through-hole.
[22] Also, the case 4 is formed to be narrow in width and long, and is adhered and secured by engaging an engagement portion 4a of the case with the through-hole of the handle 2, and is formed with a long receiving chamber 4b at the bottom surface along the longitudinal direction, so that a switch 12 is connected to the handle via an connection hole formed at the rear side of the receiving chamber 4b.
[23] The E-core 6 is formed long integrally along the length of the receiving chamber 4b of the case 4, and is formed protrusive with a plurality of engagement protrusions 6a at the bottom surface in consideration of the size of the bobbin 8, and is adhered and secured to the receiving chamber 4b of the case 4 by means of epoxy resin, and the like.
[24] Also, each of the bobbin 8 has coils wound therearound, and is engaged and secured to the engagement protrusions 6a of the E-core 6 prior to the adhesion and securing to the case 4, so that the bobbin 8 can be disposed in parallel in a line with maintaining equal interval there-between due to the E-core 6, and can dispose several pieces simply.
[25] However, the bobbin 8 used in the present invention may be satisfyingly provided by at least four pieces because they can provide sufficient alternative current required for the demagnetization, and it is none the less to say that the engagement protrusions 6a of the E-core 6 are disposed in a row so that the bobbins can be arranged in the row.
[26] Meanwhile, the switch 12 is disposed and secured such that a touch portion is exposed to the upper portion via the connection hole, and the temperature sensor 10 is disposed so that it is connected between the switch 12 and the bobbin 8. In addition, the temperature sensor 10 is positioned in the case 4 together with the bobbin 8 so that it intercepts the power supply when the inside temperature of the case 4 rises above predetermined temperature and the temperature sensor detects it, and when the inside temperature of the case is cooled power supply is again initiated.
[27] However, since the temperature sensor 10 used in the present invention should be provided with a function of only sensing the temperature in addition to electric power opening and closing means and a controller for controlling them, and since it occupies large space and the weight thereof is increased so that it is disadvantageous to the miniaturization and weight- lightening, it is preferable to use a bimetal as the
temperature sensor 10.
[28] In other words, the bimetal temperature sensor 10 is made by joining two kinds of metal plates having thermal expansion ratios different from each other so that it is electrically conducted, when the temperature rises above a predetermined temperature, it is electrically shorten by the thermal deformation of any one metal plate, and when the temperature is lowered, the deformed metal plate is recovered to be electrically conducted, so that it is possible to satisfy the two functions of preventing over-heat by intercepting or connecting the electric power according to the temperature sensing and the sensed temperature.
[29] In the present invention, it is preferable to perform the molding treatment of the receiving chamber 4b of the case 4 with epoxy resin and the like to thereby protect parts such as the bobbin 8 and the like, and to engrave the molding surface so that it becomes a plane surface.
[30] In the present invention, since the several bobbins 8 with coils wound therearound are engaged so that it is secured to the parallel engagement protrusions of the E-core 6, several bobbins 8 can be simply disposed via the E-core 6.
[31] Also, since more than four bobbins can provide sufficient alternative magnetic force required for the demagnetization, it is possible to make the width of the demagnetization portion of the case 4 narrow by disposing and connecting several bobbins in one line because the size of the bobbin 8 is small.
[32] Moreover, since the total weight of the handle 2, the case 4, the E-core 6, and the several bobbins 8, and the like becomes about 1 D, although the length of the case 4 and the E-core 6 is made longer and a few number of bobbins 8 are further disposed, the total weight is still light so that it is possible to easily handle it and perform the demagnetization of parts or products disposed at a narrow or a deep place simply and quickly although the case and the E-core are lengthened as long as it is desired.
[33] In addition, the demagnetization is performed by applying electric power by using the switch 12 thereby producing alternative magnetic force by means of the E-core 6 and the coils of the bobbins 8. When the inside temperature of the case 4 is risen to above about 7O 0 C by the heat produced from the coils of the bobbins 8 due to long use during the demagnetization, the temperature sensor 10 detects it and intercepts the electric power, so that it can be used safely without any damage to the parts due to high temperature and it is easy to sense the interception of the electric power supply since a weak vibration produced from the bobbins 8 is stopped, and when the temperature of the inside of the case is lowered below 4O 0 C by the sufficient cooling with the lapse of time, the electric power is again supplied so that the demagnetization can be performed in sequence.
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