Electric appliance, its assembling method, and its housing structure

Abstract: An upper case 1 and a lower case 2 are fixed by no screw, so that assemblage workability is improved. An electric appliance can be divided into plastic upper case 1, metal-plate-made lower case 2, and logic package 9 having print substrates. As a result, the electric appliance is easy to waste.

Description: Background of the Invention Field of the Invention The present invention relates to a method of assembling an electric appliance, an electric appliance, and a housing structure of an electric appliance, such as telephones and facsimiles for carrying out information communication through telephone lines . Such a method of assembling an electric appliance and such an electric appliance one disclosed in the US-A- 5 144 533. Description of the Prior Art According to the conventional electric appliances such as communication terminal apparatus for carrying out information communication by means of telephone lines, the housing of the appliance is made of conductor material such as metal plate as shown in FIG 26. A logic package (d) is placed in an upper case (a) having a plurality of bosses (c) and a lower case (b) of a L shape and secured there, an indication panel (e) is attached to a front portion of the upper case (a), and a push button (g) is installed on an electric key (f) mounted on the logic package (d) According to the conventional electric appliances, the upper case (a) is as described above made of metal plate or sheet, so that a number of manufacturing steps are necessary and workability of the appliance assembling is low since the lower case (b) is secured to the upper case (a) through a number of bosses (c) and screws (h). In addition, conventionally, according to the electric appliances such as communication terminal apparatus and the like for carrying out information communication by means of telephone lines, the push button switch portion is structured as shown in the official gazette of Utility Model Hei 1-142125 by attaching the push button unit to the housing side and then placing a logic package having electric keys mounted thereon in the housing. As described above, according to electric appliances of the prior art, the push button unit is attached to the housing side, and then the logic package provided with electric keys mounted thereon is contained in the housing in order to structure the push button switch portion, so that it is impossible to confirm or know whether the push button switch portion is completely structured or not unitl the electric appliance is assembled resulting in poor workability of assembly. Summary of the Invention The method of assembling an electric appliances of the present invention, is defined in claim 1. The electric appliance of the present invention is defined in claim 5. The housing structure of an electric appliance of the present invention is defined in claim 14. Specific embodiments of the present invention are claimed by the claims 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 15 and 16. Consequently, it is the first purpose of the present invention to provide an assembling method of an electric appliance of easy and improved workability since the housing structure of the appliance uses no screw. It is the second purpose of the present invention to provide an electric appliance provided with an upper case, a lower case, and a logic package, which are easily disassembled and divided into respective kinds of material making wasting the appliance easy. Also, it is the third purpose of the present invention to provide a housing structure of the electric appliance, which housing don't use screw to assemble making assembling and disassembling workability of the structure improved. It is the fourth purpose of the present invention is to provide a housing structure of improved assembling and disassembling workability, wherein a side edge portion of the logic package is inserted and pushed into grooves of the logic package holding portion, so that it is easy to assemble the logic package onto the upper case, L shape protrusions of the hook are hooked on the front logic package holding portion and engagement hole portion of the lower case side engagement portion in order to assemble the upper and the lower cases. It is the fifth purpose of the present invention to provide an electric appliance of improved assemblage workability by making use of securing screw of liquid crystal indicators zero comparing to the conventional securing mechanism. Also, it is the sixth purpose of the present invention to provide an electric appliance which have a liquid crystal indicator easily secured by no use of screws, as well as any shock of the liquid crystal indicator generated while handling of the electric appliance can be absorbed. It is the seventh purpose of the present invention to provide an electric appliance of improved assemblage workability since it is possible to confirm whether the push button switch portion is completely structured after the push button switch portion is assembled and before the electric appliance is wholly assembled. In addition, it is the eighth purpose of the present invention to provide an electric appliance of high quality in which it is impossible to see the interior of the electric appliance through gaps between the push buttons, as well as to leak any light beam from the interior. It is the ninth purpose of the present invention to provide an electric appliance in which positional relationship between the push buttons and the electric keys can be settled, so that it is easy to structure the push button switch portion. It is the tenth purpose of the present invention to provide an electric appliance in which the push buttons are prevented from being mutually contacted with each other while operation of the push button switch portion, and top ends of the push buttons are prevented from being uneven in height by they are contacted with edge portions of the oval holes improving operability of the push button switch portion. It is the eleventh purpose of the present invention to provide an electric appliance having characteristics of no use of screw for the housing structure making assemblage of the appliance easy and assemblage workability improved, while it is possible to make number of interfaces to be mounted on the logic package increase miniatuarizing the hole structure and simplifying the assemblage and disassemblage of the appliance. The characteristics of the electric appliance according to the present invention will be made apparent from reading the following description with reference to the accompanying drawings. Brief Description of the Drawings FIG 1 is a front view of the electric appliance concerning an embodiment of the present invention. FIG 2 is a perspective view of the embodiment above. FIG 3 is a plane view of the electric appliance. FIG 4 is a right side elevation of the electric appliance. FIG 5 is a rear view of the electric appliance. FIG 6 is an exploded perspective view of the electric appliance. FIG 7 is a perspective view of the upper case of the appliance. FIG 8 is a perspective view of the lower case of the appliance. FIG 9 is a perspective view of the logic package. FIG 10 is a perspective view of the push button unit. FIG 11 is a detailed sectional view taken along line A-A in FIG 10. FIG 12 is a perspective depicting rear portion engagement condition of the electric appliance. FIG 13 is a section taken along line B-B in FIG 12. FIG 14 is a perspective showing a front portion assembled of the electric appliance. FIG 15 is an exploded perspective view of the front portion. FIG 16 is a perspective showing engagement condition of the upper case and lower case. FIG 17 is a section taken along line C-C shown in FIG 16. FIG 18 is a sperspective showing a securing condition of liquid crystal indicator. FIG 19 is a section taken along line D-D shown in FIG 18. FIG 20 is a perspective showing installation of the logic package. FIG 21 is a section taken along line E-E in FIG 20. FIG 22 is an exploded perspective of the electric appliance of another embodiment according to the present invention. FIG 23 is an exploded perspective of the electric appliance of still another embodiment. FIG 24 is a perspective of the rear portion of the electric appliance. FIG 25 is a perspective of the insulator bushing. FIG 26 is an exploded perspective of the conventional electric appliance. Description of the Preferred Embodiment An electric appliance is structured with a plastic-made upper case 1, a metal-made lower case, indication panel 3, push button unit 4, and logic packages 9 and 10. As shown in FIG 7, the upper case 1 has an upper face portion 1A, the left and the right side face portions 1B, 1C and a front face portion 1D, failing to have a rear face portion. The front face portion 1D is a slanted face inclined downward. The left side portion 1B has heat radiation holes 1a and the left and the right side face portions 1B and 1C have logic package holding portions 20, 21, and 22, respectively so formed at front, rear, and center positions of the inner face portions of the side face portions as to protrude from the upper case 1. The front and central logic package holding portions 20 and 22 have the same structure. They are structured or combined by combining both the upper and the lower U shape protrusions 1e and 1f back to back leaving a guide groove 1z between them, and leaving an insertion groove lg between the lower U shape protrusion 1f and inner face portions of the left and the right side face portions 1B and 1C. The rear side logic package holding portion 21 is assembled as shown in FIGS 7, 16, and 17 by combining the upper and the lower U shape protrusions 1e and 1f back to back and leaving the guide groove 1z between them and the insertion groove 1g between the lower U shape protrusion 1f and the inner face portions of the left and the right side face portions 1B and 1C, then protruding a rear portion of the lower U shape protrusion 1f rearward from the upper U shape protrusion 1e forming a ptotruded or stepped portion of an engagement portion 23 for the upper case side engagement portion, and forming an engagement protrusion 1m as shown in FIG 21 at the front portion of the guide groove 1z so as to engage with the notch 9f of the logic package 9. The inner face portions of the left and the right side face portions 1B and 1C have front and rear longitudinal ribs 1h and these longitudinal ribs 1h have lower ribs 1y leaving gaps 1i. A front face portion 1D of the upper case 1 has a liquid crystal indicator containing portion 24 securely containing liquid crystal indicators (LCD)5 and a push button unit installation portion 25 on which the push button unit 4 is mounted. The liquid crystal indicator container or containing portion 24 has a rectangular opening 1t, a stepped portion 1d formed around the circumference of the rectangular opening 1t, and protrusion 1u and 1c placed above and below the opening 1t sandwiching liquid crystal indicators 5. As shown in FIG 7 and FIG 15, the push button unit installation portion 25 has oval openings 1s accommodating the push buttons 4a. The oval opening 1s has a plurality of protrusions 1v formed on the upper and the lower face portions at a regular interval and holes 1r formed above and below the oval openings 1s in order to install the push button unit 4. On the central portion of rear interior of the upper face portion 1A of the upper case 1, there is an engagement portion 26 of the upper case with which an end portion 2k of the rear face portion 2B of the lower case 2 engages. The engagement portion 26 is formed integrally with the lower case 1 and has a slanted face 1x and a groove 1w. As shown in FIG 8, the lower case 2 is integrally made of conductor such as metal plate in order to shield static electricity and noise from entering the electric appliance. The lower case 2 has a bottom portion 2A and rear portion 2B. The bottom portion 2A has a recess 2d for preventing contacting with ROM 14 mounted on the logic package 9 and heat radiating hole 2n. Also, there are ribs 2e on both the sides of the bottom face portion 2A and these ribs 2e engage with the gaps 1g and 1j of the upper case 1. The hook 27 formed on the front portion of the rib 2e is made of L shape protrusion 2b having a notch 2c. The rib 2e has a flat portion 2j at its rear end and the cut-off portion of the rear end of the rib 2e functions as stopper 2q. The bottom face portion 2A has a rib 2m at its front edge portion. The rear portion 2B of the lower case 2 has a U shape notch 2h, bis hole 2g, plural openings 2r, and a notch 2f facing the stopper 2q formed at the rear end of the rib 2e and functioning an engagement hole of the lower case 2. As shown in FIG 7, the indication panel 3 has an oval hole 3b accommodating the push button 4a of the push button unit 4 and a transparent portion 3a for the liquid crystal indicator 5. As a result, the indicator 5 can be seen from the outside. As shown in FIGS 10, 11, 14, and 15, the push button unit 4 has a rectangular case main body 4A and protrusions 4b positioned at four corners of the front face portion of the case main body 4A so as to engage with the holes 1r of the upper case 1. One side of front face of the case main body 4A has accommodation portion 41 for accommodating the front end portion 12a of light emission diode (LED)12 and the accommodation portion 41 has a hole 4m. A plurality of push buttons 4a are arranged in left and right direction on the front side of the case main body 4A. These push buttons 4a are attached to the case main body 4A through resilient connection pieces 4C. A stopper 4k is fixed respectively to the lower side of the push button 4a. Rear face of the push button 4a has a raised portion or stand 4d contacting with a front end 11a of the electric key 11. Pillars 4e are placed in the case main body 4A so as to position at rear of the gaps between the push buttons 4a. Engagement portions 28 are formed on the left and the right ends of the lower portion of the case main body 4A. These engagement portions 28, respectively have grooves 4g for accommodating front ends of the logic package 9 and a cantilever engagement piece 4h. A front end portion of the engagement piece 4h has a protrusion 4j engageable with the hole 9c of the logic package 9 and the protrusion 4j has a slanted face 4n. As shown in FIG 9, the logic package 9 is structured by a print substrate. A connector 15 having part of a terminal 15a connected to an earth is mounted on the logic package 9. A bottom face of the print substrate has a connector 14a and ROM 14. A face portion of the print substrate has a hole 9a on which a spacer 8 is installed and a hole 9b on which a spacer 7 is installed. A front edge portion of the print substrate has a plurality of electric keys 11, light emission diode (LED)12 provided with an indicator 12a, a hole 9c engaging with the push button unit 4, a hole 9e on which a holder 6 is installed, and a connector 13 for connecting the liquid crystal indicator (LCD)5. A rear edge portion of the print substrate has connectors 29, 30 constructing interfaces, a package holder 17 having a cable holder 18a mounted thereon to secure the power cable 18, and a power switch 19. The package holder 17 has a screw hole 17a formed therein. Front end portions at both sides of the print substrate has a chamferred portion 9d and the rear portion of the print substrate has a notched portion 9f. The logic package 10 is of a print substrate and upper side portion of the logic package 10 has a connector 16 provided a terminal 16 mounted on part of the connector 16 and connected with an earth. Four corners of the print substrate have four holes 10a and the spacer 7 has a protrusion 7a and a reaf spring 7b. The liquid crystal indicator (LCD)5 has a connection cable 5a. Next, assembling steps of the electric appliance structured as mentioned above will be explained. First an indication panel 3 is sticked surely on a front outside of the upper case 1. The logic packages 9 and 10 are secured by inserting the protrusions 7a, on the upper end and the lower end of the spacer 7 which is sandwiched between these packages 9 and 10 in order to make a gap between them preventing electronic parts mounted thereon from interferring to each other, into holes 9b and 10a of each logic packages 9 and 10 with aid of functioning of the reaf spring 7b. In addition, insertion of the protrusions 7a of the spacer 7 sandwiched between the logic packages 9 and 10 into the holes 9b and 10a makes positioning or position determination of the connectors 15 and 16 of respective logic packages 9, 10 while fitting of these connectors easy resulting in improved assemblage workability. The protrusion 8a of the spacer 8 is inserted upward through the hole 9a of the logic package 9 and the logic package 9 is secured by function of the reaf spring 8b. While, front end of the connection cable 5a connected to the liquid crystal indicator (LCD) is secured to a connector 13 mounted on the logic package 9. Protrusions 6a of the holders 6 are inserted into the holes 9e of the logic package. While, as shown in FIGS 14 and 15, the push button unit 4 is mounted on the front end of the logic package 9 and structures the push button switch together with the electric key 11. That is, the front end of the logic package 9 is inserted into the resilient engagement piece 4h of the push button unit 4 and the bottom face of the case main body 4A, and a protrusion 4j formed on front end of the engagement piece 4h engages with the hole 9c of the logic package 9, as a result the push button unit 4 is secured to the logic package 9 and front end 11a of the electric key 11 mounted on the logic package 9 contacts with the raised portion 4d of the push button 4 obtaining or completing the push button switch. In addition, the indicator 12a of the light emission diode (LED) mounted on the logic package 9 is accommodated in the hole 4m of the push button unit 4. Here, it is noted that the slanted face 4m of protrusion 4j of the push button unit 4 makes insertion of the logic package 9 easy and the groove 4g functions a role of stopper while insertion movement of the logic package 9. Additionally, the resilient connection piece 4c of the push button unit 4 makes operation of the push button 4c smooth. Next, as shown in FIGS 20 and 21, after the push button unit 4, the liquid crystal indicator (LCD)5, holder 6, the logic package 10 fixed through the spacers 7, and the spacers 8 are mounted on the logic package 9, the left and the right side edge portions of the logic package 9 are inserted into the guide groove 1z of the rear side logic packages holding portions 21 placed at the left and the right side portions of the upper case 1, the logic package 9 moves forward from rear of the upper case 1, the left and the right side edge portions of the logic package 9 are sequentially inserted into the guide grooves 1z of the center and the front logic package holding portions 20, 21, 22, the protrusion 1m of the rear side logic package holding portion 22 engages with the notch 9f formed at the rear portion of the logic package 9 in order to fix the logic package 9 to the upper case 1. It is noted that the chamferred portion 9d formed on the front portion of the logic package 9 and roundness 1n of the entrace portion of the guide groove 1z of the logic package holding portions 20, 21, 22 make insertion workability of the logic package 9 improved. In addition, as shown in FIGS 18 and 19, upper portion and both sides of the liquid crystal indicator (LCD)5 fit in the stepped portion 1d formed at the front portion of the upper case. In detail, the upper portion of the LCD5 engages with the protrusion 1u of the upper case 1 and the lower portion of the LCD5 is mounted on the protrusion 1c. The holder 6 having its lower portion mounted on the logic package 9 restricts rearward movement of the LCD5 and the resilient fixing portion 6b of the holder 6 absorbs shock of the LCD5. While, as shown in FIGS 14 and 15, the push button 4a of the push button unit 4 and the accommodation portion 41 accommodating the LED 12 are accommodated in the oval hole 1s of the upper case 1, and the protrusion 4b of the push button unit 4 engages with the hole 1r of the upper case 1, as a result the push button unit 4 is secured to the upper case. It is noted that the protrusion 1r of the upper case 1 prevents the push buttons 4a of the push button unit 4 from mutually contacting with each other. The pillars 4e of the push button unit 4 prevents the interior of the electric appliance from being seen through a gap or space between the push buttons 4a while the front side of the appliance is seen. Also, as shown in FIGS 11 and 15, the engagement portions 4k of the push buttons 4a come contact with the lower edge of the oval hole 1s of the upper case 1 in order to prevent the front ends of the plural push buttons 4a from being uneven. Next, fixing of the upper case 1 and the lower case 2 will be explained. First, the upper case 1 is turned over making its upper face 1A directed downward, then L shape protrusion 2b of the lower case 2 is inserted under the front logic package holding portion 20 of the upper case 1 and secured there, the lower case 2 turns toward the upper case 1 around a fulcrum of the front logic package holding portion 20 so as to overlap the lower case 2 upon the upper case 1, and the left and the right ribs 2e of the lower case 2 engage with the gaps 1g and 1j of the upper case 1. Next, the lower case 2 is pushed frontward, and end portion 2k of the rear face 2B of the lower case 2 slides along the slanted face 1x of the engagement portion 26 near the rear and center portion of the upper case 1 in order to make the end portion 2k engaged with the groove 1w. Then, the lower case 2 is pushed upwardly along an arrow A direction as shown by broken lines in FIGS 16 and 17, then slides in an arrow B direction to its position on the upper case 1. Consequently, an engagement portion 23 at a rear end of the rear and lower U shape protrusions 1f of the upper case 1 is inserted between the flat portion 2j and the notch 2f of the lower case 2. When the upper case 1 and the lower case 2 are secured up-and-down direction, the logic package holding portion 20 and L shape protrusion 2b are engaged with each other at the front portion of the cases and the engagement portion 23 engages with the rear notch 2f. When the upper case 1 and the lower case 2 are horizontally secured, an engagement at the rear center portion of the cases, or an engagement of the end portion 2k of the rear face portion 2B of the lower case 2 and the engagement portion 26 of the upper case 1 are carried out. It is noted that, as shown in FIGS 12 and 13, the slanted face 1x of the upper case 1 makes insertion of the end portion 2k of the lower case 2 easy and workability of engagement of the groove 1w of the upper case 1 and the end portion 2k of the lower case 2 becomes easy since about the groove 1w of the upper case 1 deforms as shown by dotted lines. As described above and shown in FIG 16 and FIG 17, the lower case 2 moves upwardly in the direction A to its installation position on the upper case 1 and slides in the direction B, so that the engagement portion 23 of the rear end portion of the rear lower U shape protrusion 1f of the upper case 1 engages with between notch 2f and flat portion 2j of the lower case 2. In order to disengage or disassemble the lower case 2 from the upper case 1, the lower case 2 slides along the arrow C direction and the lower case 2 stops when the end portion 21 of the rib 2e of the lower case 2 contacts with an inside of the rib 1q of U shape protrusion 1f of the upper case 1. As a result, it is possible to prevent the lower case 2 and ROM 14 mounted on the connector 14a on the bottom face of the logic package 9 from contacting to each other while the lower case 2 is installed and disassembled. In addition, the spacer 8 mounted on the bottom face of the logic package 9 prevents the lower case 2 from contacting to the logic package 9 when the electric appliance is upwardly pushed. Last, whole assemblage of the electric appliance is completed by inserting a bis 31 through the hole 2g of the lower case 2 and threading to the screw hole 17a of the package holder 17 of the logic package 9. FIG 1 to FIG 5 show the electric appliance assembled. In addition, the bis 31 intends to electrically conduct the lower case 2 to the earth of the logic package 9 through the package holder 17 and the bis 31 is not so important to the assemblage of the housing of the electric appliance according to the present invention. Using this bis 31 makes the upper and the lower cases 1 and 2 and the logic package 9 strongly binded. Because ROM 14 is mounted on the connector 14a and on the bottom face of the logic package 9, it is easy to exchange ROM 14 only by disassembling the lower case 2. In addition, the purpose of the recess 2d of the lower case 2 is to lessen the height of the electric appliance of the present invention by placing the bottom face of the lower case 2 and a rubber seat 32. FIG 22 shows another embodiment of the electric appliance according to the present invention. According to the embodiment above, a screw seat 33 is provided on the inner face portion of the upper face portion 1A of the upper case 1, a screw hole 34 is formed on the lower case 2, the upper and the lower cases 1 and 2 are assembled as mentioned above, and the bis 35 is threaded into the screw seat 33 through the screw hole 34 in order to make the fixing of the lower case 2 and upper case 1 sure. FIG 23 shows still another embodiment of the present invention. According to the embodiment, the rear edge portion of the print substrate of the logic package 9 has connectors 29, 30 structuring interfaces, package holder 17 having a power cable 18 secured by a cable holder 18a and mounted thereon, a power switch 19, and earth terminal 36. In this case, the rear edge portion of the print substrate has a power switch 19, earth terminal 36, connector 29, connector 30, respectively arranged in this order from the left side to the right side toward the front face of the print substrate. The package holder 17 is placed in front of the earth terminal 36. The earth terminal 36 has only the function of earth connection and screw hole 36a for the function. The power cable 18 has an insulator bushing 37 functioning to protect the power cable 18 from the notch 2h of the rear face portion 2B of the lower case 2. In detail, as shown in FIG 25, the insulator bush 37 has a central hole 37b through which the cable 18 passes and a circumferential groove 37a in which an edge portion of notch 2h is inserted. As described above, the rear portion of the logic package 9 has a connector 29 structuring interface and the power switch 19, and the package holder 17 having the power cable 18 mounted thereon is removed leaving a vacant space. Earth terminal 36 having only the earth connection function is mounted on the space, rear face portion of the lower case 2 has a notch 2n, and the insulator bushing 37 through which the power cable 18 passes is removably fixed to the notch 2h, so that it is possible to mount more interfaces on the logic package 9 miniaturizing the electric appliance and simplifying the assemblage and disassemblage of the appliance. As described above, the assembling method of an electric appliance comprising an upper case having a plurality of logic package holding portions arranged on the inner side of the left and the right side face portions in front and rear direction at a regular interval and the upper case side engagement portion, a lower case having hooks formed at the left and the right front portions and the lower case side engagement portion, a push button unit, a logic package and grooves for inserting the logic package, is characterized by the steps of installing the push button unit on the logic package, inserting the logic package into the upper case using as a guide the grooves formed at the logic package holding portion and holding the package there, hooking the hook portions of the lower case on the most front logic package holding portion in order to revolve the lower case toward the upper case side and overlap the lower case upon, upper case, pushing-in the lower case in order to make the lower case side engagement portion engaged with the upper side engagement portion, thus no screw is used comparing to the conventional one resulting in simplicity of the assemblage of the electric appliance and improvement of the workability of assemblage. Additionally, an electric appliance comprising an upper case, a lower case, a logic package and grooves for inserting the logic package is characterized in that the plastic upper case has a plurality of logic package holding portions arranged on the interior of the left and the right side face portions in the front and rear direction at a regular interval and the upper case side engagement portion, the conductive lower case is provided with the lower case side engagement portions and hooks arranged on the left and the right front portions, said hooks being hooked on the most front logic package holding portion in order to turn lower case toward the upper case side and to overlap it on the upper case and to push the lower case resulting in an engagement of the lower case side engagement portion with the upper case side engagement portion, the logic package is inserted in the upper case using a guide of the logic package holding portion and secured there, and a push button unit is removably installed on the logic package, so that it is possible to easily disassemble to upper case, lower case, and the logic package and to sort them according to the kind of material simplifying waste treatment of the electric appliance. In addition, a housing structure of the electric appliance comprising an upper case and a lower case is characterized in that the upper case is provided with a plurality of logic package holding portions arranged on the interior of the left and the right side face portions in the front and rear direction at a regular interval and the upper case side engagement portion, the lower case is provided with the lower case side engagement portions and hooks arranged on the left and the right front portions, said hooks being hooked on the most front logic package holding portion in order to turn the lower case toward the upper case side and to overlap lower case on the upper case and to push the lower case resulting in an arrangement of the lower case side engagement portion with the upper case side engagement portion, so that it is possible to carry out assemblage and disassembling operation of the housing of the electric appliance and improve assemblage and disassemblage workability. Additionally, with the housing structure of the electric appliance, the logic package holding portion formed on the interior faces of the left and the right side portions has a horizontal groove through which the side edge portion of the logic package is inserted, the upper case side engagement portion at least protrudes rearward toward the under side portion of the rear logic package holding portion, the lower case side engagement portion is provided on a L shape or curved portion format at a rear face portion of the lower case, said upper case side engagement portion is an engagement hole adapted to engage with the engagement portion when the lower case is matched with upper case, and hooks are L shape protrusions having notches to be hooked on the front logic package holding portion, so that when the side edge portion of the logic package is forcibly inserted in the groove of the logic package holding portion, it is easy to assemble the logic package to the upper case, L shape protrusions of the hooks are hooked on the front logic package holding portion, and engagement hole of the lower case side engagement portion engages with the engagement portion of the upper case side engagement portion in order to carry out assemblage of the upper and the lower cases and improve assemblage and disassemblage workability of the housing. According to the electric appliance of the present invention, the liquid crystal indicator fits into the stepped portion of the opening, the upper portion of the liquid crystal indicator engages with the upper protrusion, the lower portion of the liquid crystal indicator engages with the lower protrusion in order to prevent up and down direction and right and left direction movement of the indicator, a pressing member mounted on the logic package presses the rear face of the liquid crystal indicator in order to hold the indicator preventing its rearward movement. As a result, no screw is used simplifying a fixing of the liquid crystal indicator and improving its assemblage workability. Additionally, according to the electric appliance, the fixing structure of the liquid crystal indicator has a resilient holding member pressing the rear face of the liquid crystal indicator, so that no screws is used, the liquid crystal indicator can be easily held and shock applied to the liquid crystal indicator when the electric appliance is handled can be absorbed. According to the electric appliance of the present invention, the case has a push button switch installation portion provided with a push button switch portion, the logic package having a plurality of electric keys arranged its front edge portion has engagement portions, the push button unit has a plurality of push buttons arranged on the front face portion of the case main body in right and left direction, these push buttons are attached to the case main body through resilient push button connection pieces, the case main body has engagement portions adapted to engage with the logic package engagement holes, the engagment portion engage with the engagement holes of the logic package and the push button unit is installed on the front edge portion of the logic package in order to contact the front ends of the electric keys to the back of the push button structuring the push button switch portion and pushing-in of the logic package makes the push button switch portion installed in the push button switch installation portion of the case. As a result, the push button switch portion is structured by engaging the engaging portion with the engagement holes of the logic package, installing the push button unit on the front edge portion of the logic package, making the front ends of the electric keys contacted with the back face of the push button, then pushing-in the logic package so as to install the push button switch portion the push button switch installation portion of the case. As a result, it is possible to confirm whether the push button switch portion is completely structured after only the push button switch portion is assembled before wholly construction of the appliance, improving the assemblage workability. As described above, the electric appliance has a plastic upper case provided with a plurality of logic package holding portions arranged on the inner side of the left and the right side face portions in front and rear direction at a regular interval, as well as upper case side engagement portions, a conductive lower case having lower case side engagement portions and the left and the right front hooks, said hooks being adapted to hook on the most front logic package holding portion and the lower case being turned to upper case side and overlapped on the upper case and pushed into the upper case in order to make the lower case side engagement portion engaged with the upper case side engagement portion, the logic package adapted to insert and be held in the upper case using the logic package holding portion as a guide for insertion, and a connector and power switch structuring interfaces which are placed at rear of the logic package. Furthermore, the package holder securing and mounting power cable is removed leaving a space in which earth terminal having only earth connection function, rear face portion of the lower case has a notch, and an insulator bushing through which power cable passes is removably attached to the notch, as a result, no screw is used in the housing structure comparing to the conventional housing employing fastening screws resulting in easy assemblage of electric appliance and improved workability of assemblage, while it is possible to mount more interfaces on the logic package, to miniaturize the electric appliance, and simplify its assemblage and disassemblage.

Claims: A method of assembling an electric appliance having an upper case (1) provided with a plurality of logic package holding portions (20, 21, 22) arranged on inner sides of left and right side face portions (1B, 1C) in front and rear direction of the upper case (1) at a regular interval and upper case side engagement means (26), a lower case (2) provided with hooks (27) formed at front portions of left and right sides of the lower case and a lower case side engagement portion (2k), a logic package (9) and grooves (1z) for inserting the logic package (9), said method comprising the steps of: inserting the logic package (9) into the grooves (1z) formed on said logic package holding portions (20, 21, 22) of said upper case (1); hooking the hooks (27) of the lower case (2) on the most front logic package holding portion (20) so as to arrange the lower case (2) slidable and rotatable with respect to the upper case (1); positioning the lower case (2) to overlap with the upper case (1) by rotating the lower case (2) about the hooks (27); and pushing the lower case (2) forward and against the upper case (1) so as to engage the lower case side engagement portion (2k) with the upper case side engagement portion (26), so that the upper case (1) is fixed to the lower case (2). A method of assembling an electric appliance according to claim 1, characterized in that the electric appliance further comprises a push button unit (4) and the method further comprises the step of installing the push button unit (4) on the logic package (9). A method of assembling an electric appliance according to claims 1 or 2, characterized in that the electric appliance further comprises a liquid crystal indicator (5) and the method further comprises the step of installing the liquid crystal indicator (5) on the upper case (1). A method of assembling an electric appliance according to claims 1, 2 or 3, characterized in that the electric appliance further comprises a connector and power switch structuring interface (19, 36, 29, 30) and a package holder (17) and the method further comprises the step of installing the connector and power switch structuring interface (19, 36, 29, 30) and the package holder (17) on the logic package (9). An electric appliance comprising an upper case (1), a lower case (2), a logic package (9) and grooves (1z) for inserting the logic package (9), wherein the upper case (1) is provided with an upper case side engagement portion (26) and a plurality of logic package holding portions (20, 21, 22) being located inside of left and right face portions (1B, 1C) in front and rear direction of the upper case (2) at a regular interval and being provided with the grooves (1z) and the lower case (2) has a lower case side engagement portion (2k) and left and right hooks (27), said hooks (27) being adapted to hook on the most front logic package holding portion in order to position the lower case (2) to overlap with the upper case (1) such that pushing the lower case (2) forward and against the upper case (1) results in an engagement of the lower case side engagement portion (2k) with the upper case side engagement portion (26), wherein the side edge portions of the logic package (9) can be inserted into the grooves (1z) to be held in the upper case (1). An electric appliance according to claim 5, characterized in that said upper case side engagement portion (26) is located on a central and rear interior portion of the upper case (1), and said lower case side engagement portion (2k) is an edge portion (2k) of a rear face (2B) of the lower case (2), such that the edge portion (2k) engages with the upper case side engagement portion (26) when the lower case (2) is fitted to the upper case (1). An electric appliance according to claims 5 or 6, characterized in that said hooks (27) are L shape protrusions (2b) having notches (2c) adapted to be hooked on the most front logic package holding portions (20). An electric appliance according to claims 5, 6 or 7, characterized by a push button unit (4) removably installed on the logic package (9), wherein said push button unit (4) has a case main body (4A) in which a plurality of push buttons (4a) are arranged in left and right directions of the case main body (4A) and which is provided with an engagement portion (28); the upper case (1) is further provided with a push button unit installation portion (25) on a front face portion (1D) of the upper case (1) in order to install these push buttons (4a) arranged in the push button unit (4), and the logic package (9) is further provided with a plurality of electric keys (11) corresponding to the respective push buttons (4a) and an engagement hole portion (9c) adapted to engage with the engagement portion (28) of the push button unit (4) in order to install the push button unit (4) on the front edge portion of the logic package (9) and contact front ends (11a) of these electric keys (11) to rear faces (4d) of these push buttons (4a). An electric appliance according to claim 8, characterized in that the case main body (4A) of the push button unit (4) has a plurality of pillars (4e) in order to be positioned at rear of the gaps between these push buttons (4a). An electric appliance according to claim 8, characterized in that the push button unit installation portion (25) has a plurality of oval holes (1s) accommodating the push buttons (4a) and a plurality of holes (1r) placed above and below the oval holes (1s); the push button unit (4) has protrusions (4b) to be engaged with holes (1r) of upper case (1) on the front face portion of the push button unit (4) and the engagement portion (28) having a groove (4g) accomodating the front end portion of the logic package (9) and a cantilever engagement piece (4h), the cantilever engagement piece (4h) having a protrusion (4j) which, having a slanted face (4n), engages with the engagement hole portion (9c) of the logic package (9). An electric appliance according to claim 8, characterized in that the push button unit installation portion (25) is structured with a plurality of oval holes (1s) accomodating the push buttons (4a), a plurality of protrusions (1v) formed on the upper and the lower face portions of the oval holes (1s) at regular intervals, and holes (1r) placed above and below the oval holes (1s), and the push button unit (4) is structured by arranging the push buttons (4a) on front face portions of the case main body (4A) in left and right direction, attaching the push buttons (4a) to the case main body (4A) through resilient push button connections pieces (4c), forming stoppers (4k) on the push buttons (4a) adapted to contact with edge portions of the oval holes (1s) when the push button unit (4) is installed on the upper case (1), and forming an engagement portion (28) on the case main body (4A) so as to contact with the engagement hole portion (9c) of the logic package (9) An electric appliance according to claims 5, 6 or 7, further comprising a liquid crystal indicator (5) removably installed on the upper case (1), characterized in that the upper case (1) is further provided with a liquid crystal indicator accomodation portion (24) accomodating the liquid crystal indicator (5), the liquid crystal indicator accomodation portion (24) having an opening portion (1t), and a stepped portion (1d) which is formed around the cirumference of the opening portion (1t) and in which the frame of the liquid crystal indicator (5) fits, and an upper protrusion (1u) which, placed above the opening portion (1t), is engaged with the upper portion of the liquid crystal indicator (5), and a lower protrusion (1c) which, placed below the opening portion (1t), is engaged with the lower portion of the liquid crystal indicator (5), and the logic package (9) is further provided with a holding member (6) by which the rear face portion of the liquid crystal indicator (5) is pressed and held. An electric appliance according to claims 5, 6 or 7, characterized in that the logic package (9) is provided with a connector and power switch structuring interface (19, 29, 30, 36), a package holder (17) having a power cable (18) mounted and secured thereto can be removed leaving a space in which space earth terminal having only earth connecting function is placed, the rear face portion of the lower case (2) has a notch (2h), and an insulator bushing (37) through which the power cable (18) passes is removably attached to the notch (2h). A housing structure of an electric appliance comprising an upper case (1) and a lower case (2), wherein the upper case (1) is provided with an upper case side engagement portion (26) and a plurality of logic package holding portions (20, 21, 22) located inside of left and right face portions (1B, 1C) in front and rear direction of the upper case (2) at regular intervals and the lower case (2) has a lower case side engagement portion (2k) and left and right hooks (27), said hooks (27) being adapted to hook on the most front logic package holding portion (20) in order to position the lower case (2) to overlap with the upper case (1) such that pushing the lower case (2) forward and against the upper case (1) results in an engagement of the lower case side engagement portion (2k) with the upper case side engagement portion (26). A housing structure of the electric appliance according to claim 14, characterized in that said upper case side engagement portion (26) is located on a central and rear interior portion of the upper case (1), and said lower case side engagement portion (2k) is an edge portion (2k) of a rear face (2B) of the lower case (2), such that the edge portion (2k) engages with the upper case side engagement portion (26) when the lower case (2) is fitted to the upper case (1). A housing structure of the electric appliance according to claims 14 or 15, characterized in that said hooks (27) are L shape protrusions (2b) having notches (2c) adapted to be hooked on the most front logic package holding portions (20).

Inventors: SANPEI KAZUO, YAMAUCHI TATSUO, SANPEI, KAZUO, YAMAUCHI, TATSUO
Applicants: HITACHI TELECOMM TECH, HITACHI TELECOM TECHNOLOGIES, LTD.
Application year: 1993
Main classification: H05K7
IPC codes: H05K7