Title of Invention

A HEAD STRUCTURE OF METER MOVEMENT WITH MOVING COIL

Abstract

An improved head structure of a meter movement with moving coi1, the structure comprises a magnet set, a coil, a clamping and holding stand and a yoke, wherein using of the clamping and holding stand can fast assemble and stably mount the magnet set in the yoke. When the clamping and holding stand is loosened, the magnet set can be changed immediately. Therefore, assembling of the head of the meter movement is easy, cost of production can be largely reduced, and accuracy can also be elevated. The structure is applicable to various head structures of meter movements with moving coil for driving.

Full Text

TITLE: IMPROVED HEAD STRUCTURE OF METER MOVEMEOT WITH MOVING OOIL BACKGROUND OF THE INVENTION 1. Field of the invention The present invention is related to an improved head structure of meter movement, and is especially related to a head of a meter movement with moving coil, wherein the major element, magnet, can be assembled and changed quickly, the head of meter movement is with low cost, convenient for assembling, and the accuracy of product can also be up-graded. The present invention is applicable to head structure of various meter movements. 2. Description of the Prior Art Referring to Fig. 1, a convent ional head 1 of a meter movement with moving coil comprises a magnet 10, two magnet protecting sheets 11, a coil 12, two hair springs 13 and a yoke 15, wherein the yoke 15 is composed of two semicircular sheets 151, 152, the semicircular sheet 151 is provided on the tailing end thereof with a folded sheet 153 having a hole and on the top end thereof with two arms riveted with a top sheet 156 having thereon holes. The magnet 10 is encircled by the two magnet protecting sheets 11 and is welded to the two semicircular sheets 151, 152. When in assembling, the coil 12 with an indicating needle 16 is placed in the magnet protecting sheets 11, the two ends thereof are connected to zero arms 154, 155 respectively, and it is supported by two jewels 17 and 18 provided thereon with a hair spring 13 for restoring position. Lastly, the other semicircular sheet 152 is used for covering and welding; these members are altogether placed in a plastic cylinder (not shown) to compose a semi-product of the head 1 of the meter movement. The above stated conventional head of the meter movement with the moving coil has the following defects though: 1. When in assembling, by the fact that the yoke is riveted with the top sheet, it trends to drop or displace to result in deviation of the position of the central hole. 2. When in assembling, by the fact that the magnet is welded, the surface of the magnet shall be treated for easy welding, and be cleansed after welding before electric plating to make the product; therefore, treatment in production is very cumbersome. 3. In normal processing of a head of a meter movement with moving coil, a raw magnet material is well welded and placed before it is magnetized. Because the internal magnet is unable for discriminating between superiority and inferiority only by apparent observation, when bad quality or other flaws of the magnet are found after a product is obtained by means of welding, the magnet can not be removed for changing, and it can only be wholly discarded. This not only increases the cost of production, but also creates many wastes relatively. 4. A conventional head of a meter movement with moving coil adopts the mode of welding, the magnet thereof is not easy for welding and trends to cause undesired displacement during welding. Because welding induces the phenomenon of expansion/contraction by heating/cooling, the center of the product trends to deviate, error of accuracy of the head of the meter movement assembled is large, and accuracy of the electric meter will be lowered. Therefore, the present invention is developed to eliminate the above stated defects. SUMMARY OF THE INVENTION The primary object of the present invention is to provide a head of a meter movement with moving coil, which head is easy in assembl ing, can largely reduce cost of production and can up-grade accuracy. In order to achieve the above object, the head of the meter movement with the moving coil of the present invention comprises a magnet set, a coil, a clamping and holding stand and a yoke, wherein the magnet set is composed of an encircling magnet protecting sheet and a magnet. The coi 1 is wound on a frame. The magnet set forms a gap between itself and the frame when it is mounted in the frame, and the coil has an indicating needle and two wire-outgoing ends. The clamping and holding stand has two lateral clamping arms for clamping the magnet set between the two clamping arms. The yoke is formed by abutting of two semicircular magnet protecting sheets, and forms therein a receiving space after abutting for placing therein the magnet set and the clamping and holding stand. One of the semicircular magnet protecting sheets s provided on the tai ling end thereof wi th a folded sheet having hereon a locking hole. Thereby the magnet set can be firmly clamped in the clamping .nd holding stand, and by loosening the clamping and holding tand, the magnet set can be changed at any time. The present invention will be more apparent after reading :he detailed description of the preferred embodiment thereof in reference to the accompanying drawings. 5RIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view showing the elements Df a conventional head of a meter movement with moving coil; Fig. 2 is a an exploded perspective view showing the elements of an embodiment of an improved structure of a head of a meter movement with moving coil of the present invention; Fig. 3 is a perspective view showing the appearance of a clamping and holding stand of the embodiment of the present invent ion; Fig. 4 is a perspective view showing the appearance of the embodiment of the present invention after assembling; Fig. 5 is a perspective view showing combination of the clamping and holding stand and a yoke in the embodiment of the present invent ion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring firstly to Figs. 2-5, there are shown an embodiment of an improved structure of a head of a meter movement with moving coil of the present invention. The present invention comprises mainly a magnet set 2, a coil 3, a clamping and holding stand 4 and a yoke 5, wherein the magnet set 2 is composed of a magnet 22 and a magnet protecting-sheet 21 encircling the magnet 22. The coil 3 is wound on a frame 31. The magnet set 2 forms a gap between it and the frame 31 when it is mounted in the frame 31, and the coil 3 has an indicating needle 6 and two wire-outgoing ends 32, 33. The clamping and holding stand 4 is in the shape of "U" (as shown in Fig. 3), and has a hole 41 on the top. There are an zero arm 42 (for adjusting the indicating needle 6 to return to zero) and a stopper 7 (for limiting the range of rotation of the indicating needle 6) mounted in the hole 41, a jewel 421 is provided inwardly on the zero arm 42 and is used as a fulcrum for supporting the coil 3, the zero arm 42 is further provided with a restoring hair spring 422, the clamping and holding stand 4 has two lateral clamping arms 44, 45 each wi th a stepped portion 46, the two clamping arms 44, 45 has two mutual ly spaced engaging blocks 49, a clamping opening 47 and a needle receiving space 48 are formed to engage and hold the magnet set 2 between the two engaging blocks 49. The stepped portions 46 provided on the external surfaces of the two lateral clamping arms 44, 45 each has a protruding block 461, a gap 40 is formed between each of the two lateral clamping arms 44, 45 and i ts corresponding protruding block 461, the lateral clamping arms 44, 45 are further provided on their outer lateral sides with engaging areas 43 to endue themwith elasticity; and for easy assembling, the bottom ends of the clamping arms 44, 45 at the engaging areas 43 are formed thinned arciform shapes. The yoke 5 is in the shape of a circle, and is formed by abutting of a larger semicircular magnet protecting sheet 51 which is larger than a semicircle of the member 5 and a smaller semicircular magnet protecting sheet 52 which is smaller than the semicircle, and forms therein a receiving space 54 after abutting for placing therein the magnet set 2 and the clamping and holding stand 4. The larger magnet protecting sheet 51 is provided on the tai 1 ing end thereof wi th a folded sheet 511 which is in the shape of "L" and has thereon a locking hole 512 in opposition to the hole 41 provided on the top of the clamping and holding stand 4, the hole 512 is mounted therein an zero arm 53, a jewel 531 is provided inwardly on the zero arm 53 and is used as a fulcrum for supporting the coil 3, the zero arm 53 is further provided with a restoring hair spring 532; the larger magnet protecting sheet 51 is provided on the two ends thereof with engaging areas 513. When assembling, referring again to Figs. 2-5, the magnet set 2 is firstly slipped in the coil 3, and is clamped and held by the two lateral clamping arms 44, 45 of the clamping and holding stand 4. The magnet set 2 is held between the two engaging blocks 49 of the clamping opening 47. The indicating needle 6 of the coi 1 3 can be located in the needle receiving space 48 formed between the two clamping arms 44, 45, and by abutting of the engaging areas 43 provided on the outer lateral sides of the two clamping arms 44, 45 with the larger magnet protecting sheet 51 to render the upper end of the larger magnet protecting sheet 51 able to be placed into the gaps 40 respectively of the two clamping arms 44, 45. The engaging areas 43 provided on the outer lateral sides of the clamping arms 44, 45 can be extended to the engaging areas 513 on the larger magnet protecting sheet 51 to fix the clamping and holding stand 4 and the magnet set 2 on the larger magnet protecting sheet 51 to make the two ends of the coil 3 connect respectively to the zero arms 42, 53 with their jewels 421, 531 supporting the coil 3. Lastly, the smaller semicircular magnet protecting sheet 52 is added, and the clamping and holding stand 4 and the magnet set 2 can be encircled in the receiving space 54 to form a semi-finished product for assembling latter. Because the magnet set 2 is not welded, no situation of deviation will occur. The magnet set 2 can be fixed on the clamping and holding stand 4 by taking advantage of the present invention and can be firmly received in the yoke 5. Because of the mode of assembling adopted, once the magnet 22 is found deficient, inferior or out of right position, etc., the proceeding needed needs only but to retract the clamping and holding stand 4, the magnet set 2 can be taken out at any time and a new magnet set I can be assembled. This is very convenient in production. Additionally, the present invention has another embodiment to afford a different application of assembling, wherein the joint area of the clamping and holding stand 4 with the clamping arms 44, 45 can be extended from the middle of the clamping and holding stand 4 to form extensions (as shown in Fig. 6) which are provided thereon with holes 8 for locking, the mode of assembling is same as the forgoing embodiments, and no further description is required. Thereby the present invention has the following advantages: 1. The present invention uses a clamping and holding stand to get the effect of fixing the magnet set without welding step by step. Its steps of processing are simple. It is convenient for assembl ing and can save work hours. With its simple structure, it can be firm in use after assembling, and the magnet can be clamped and assured to be located at the center. Thereby accuracy of the product is increased, and its cost of production can be largely reduced. 2. The present invention uses the clamping and holding stand to clamp the magnet set thereon, thereby when the magnet set is found to be deficient in production, it can be dismantled in an inverse direction to have the magnet set changed, this can reduce generation of wastes. The preferred embodiment is only for illustrating the present invention. It will be apparent to those skilled in this art that various equivalent modifications or changes made to the present invention without departing from the spirit and scope of this invention shall fall within the scope of the present invent ion. In conclusion, the present invention can achieve the expected objects thereof to provide an improved head structure of a meter movement with moving coil, which is applicable in industry. Having thus described my invention, what I claim as new and desire to be secured by Letters Patent of the United States are: w ' CLAIMS 1. An improves head structure of meter movement with moving coil, said structure comprises: a magnet set composed of a magnet and a magnet protecting-sheet encircling said magnet; a coil being wound on a frame, said magnet set forms a gap between itself and said frame when said magnet set is mounted in said frame, and said coil has an indicating needle and two wire-outgoing ends; a clamping and holding stand having two lateral clamping arms for clamping said magnet set between said two clamping arms; a yoke formed by abutting of two semicircular magnet protecting sheets, and forms therein a receiving space after abutting for placing therein said magnet set and said clamping and holding stand, one of said semicircular magnet protecting sheets is provided on the tailing end thereof with a folded sheet having thereon a locking hole; thereby said magnet set is firmly clamped in said clamping and holding stand, and by loosening said clamping and holding stand, said magnet set cap be changed at any time. 2. The \^ head structure of meter movement with moving coil as in claim 1, wherein: said folded sheet is in the shape of "L", and said clamping and holding stand is in the shape of "U", two zero arms are provided on two holes respectively on said folded sheet and said clamping and holding stand for adjusting said indicating needle to return to zero, and two jewels are respectively provided inwardly on said zero arms and are used as fulcrums for supporting said coil, r J. 3. The (improved Head structure of meter movement with moving coil as in claim 2, wherein: said clamping and holding stand is provided on the top thereof with a stopper to limit the range of rotation of said indicating needle. 4. The (Improved,head structure of meter movement with moving coil as in claim 1, wherein: said two lateral clamping arms of said clamping and holding stand each has a stepped portion, said two clamping arms are formed therebetween a clamping opening and a needle receiving space, said clamping opening engages and holds said magnet set therebetween, and said indicating needle is adapted to swing in said needle receiving space, said two clamping arms of said clamping and holding stand have two mutually spaced engaging blocks for engaging said magnet set therebetween. r 5. The (Improved'head structure of meter movement with moving coil as in claim 1, wherein: said yoke is in the shape of a circle, and is formed by abut ting of a larger semicircular magnet protecting sheet which is larger than a semicircle of said yoke and a smaller semicircular magnet protecting sheet which is smaller than said semicircle. 6. The improved head structure of meter movement with moving ^'—-ii... .1—-"^ coil as in claim 4 or 5, wherein: said stepped portions are provided on external surfaces of said clamping arms and each has a protruding block, a gap is formed between each of said two clamping arms and a corresponding one of said protruding blocks to allow insertion of said larger semicircular magnet protecting sheet, said clamping arms are further provided on their outer lateral sides wi th engaging areas; said larger magnet protecting sheet is provided on two ends thereof also with engaging areas for connecting wi th said engaging areas of said clamping arms. 7. The ^mproved head structure of meter movement with moving coil as in claim 1, wherein: bottom ends of said clamping arms of said clamping and holding stand are formed thinned pciform shapes. 8. The mproved Structure of meter movement with moving coil as in claim 1, wherein: a joint area of said clamping and holding stand with said clamping arms is extended from the middle of said clamping and holding stand to form extensions which are provided thereon with holes for locking. 9. An improved head structure substantially as herein described with reference to the accompanying drawings.

Documents:

784-che-2003 description (complete) granted.pdf

784-che-2003 form 1.pdf

784-che-2003 form 3.pdf

784-CHE-2003 OTHER PATENT DOCUMENT 31-08-2009.pdf

784-che-2003 petition.pdf

784-che-2003 power of attorney.pdf

784-che-2003-abstract.pdf

784-che-2003-claims.pdf

784-che-2003-correspondnece-others.pdf

784-che-2003-correspondnece-po.pdf

784-che-2003-description(complete).pdf

784-che-2003-drawings.pdf

784-che-2003-form 1.pdf

784-che-2003-form 19.pdf

784-che-2003-form 3.pdf