Abstract:
A cabinet cord eject structure includes a cord eject port penetrated in a rear part of a rear cabinet molded of a flame retardant synthetic resin, and a movable lid for closing the cord eject port integrally formed via a thin hinge portion on the rear cabinet. The movable lid is rotated open around the thin hinge portion, a chassis is inserted into the rear cabinet, an AC cord is pulled out through the cord eject port, the chassis is placed on a bottom plate portion of the rear cabinet, and the movable lid is rotated closed around the thin hinge portion to close the cord eject port.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a cabinet cord eject structure for a magnetic tape device integrated television receiver or a stand-alone television receiver. 
   2. Description of the Related Art 
     FIGS. 11 and 12  show an example of a magnetic tape device integrated television receiver (so-called “televideo”). In this example, a cathode ray tube  2  is disposed at the upper part of a cabinet  1  composed of a front cabinet  1 A and a rear cabinet  1 B, and a magnetic tape device  3  and a chassis  5  with an AC cord  4  are disposed at the lower part of the cabinet  1 . The cabinet  1  is molded of flame retardant synthetic resin to with stand high voltages, and the chassis  5  is molded of in expensive flammable synthetic resin, with a cord eject port  6  penetrated in a rear part of the rear cabinet  1 B. 
   An assembling procedure involves inserting the chassis  5  into the rear cabinet  1 B in a state where the AC cord  4  is bound by a binder  7  to easily handle the AC cord  4  as shown in  FIG. 13A , and pulling out the AC cord  4  through the cord eject port  6  and disposing the chassis  5  on a bottom plate portion  1   a  of the rear cabinet  1 B as shown in  FIG. 13B . 
   The above constitution has some problem in respect of accident prevention, because the chassis  5  made of flammable synthetic resin is exposed to the outside through the cord eject port  6 . Thereby, it is required to close the cord eject port  6  with flame retardant material in accordance with the UL standards. 
   Conventionally, to solve the above-mentioned problem, a metallic plate  8  made of a flame retardant material that is opposed to the cord eject port  6  is fixed by a screw  9  to the chassis  5  to close the cord eject port  6 , as described in JP-A-5-18068. 
   In the above constitution, the metallic plate  8  is fixed by the screw  9  to the chassis  5  to close the cord eject port  6 . However, this fixing operation is troublesome and requires a lot of time, and because of the use of the metallic plate  8 , the number of parts is increased. These increase the manufacturing costs. 
   SUMMARY OF THE INVENTION 
   The present invention has been made to solve the above-mentioned problems, and it is an object of the invention to provide a cabinet cord eject structure in which a cord eject port is securely closed with a smaller number of parts. 
   In order to accomplish the above object, a first aspect of the present invention provides a cabinet cord eject structure for a magnetic tape device integrated television receiver or a stand-alone television receiver, including: a front cabinet molded of a flame retardant synthetic resin; a rear cabinet molded of a flame retardant synthetic resin and having a bottom plate portion, the rear cabinet having a cord eject port in a rear part thereof; a chassis having a cord and disposed in the front and rear cabinets; and a movable lid for closing the cord eject port, the movable lid including a lid main body formed integrally on the bottom plate portion of the rear cabinet to be openable and closable via a thin hinge portion, an auxiliary plate projecting substantially at right angles from the top end portion of the lid main body and having a chassis opposed face, and a tab portion jutted out from a top of the movable lid; wherein the auxiliary plate is partially cut away to form a cord inserting part for passing the cord; a convex portion is protruded on the chassis opposed face of the auxiliary plate, with a central through hole bored in the convex portion; a concave portion is formed on a rear face of the chassis opposed to the convex portion, with a tapped hole formed through the center of the concave portion in the chassis; a length of the convex portion along a projecting direction of the auxiliary plate is set to be almost equal to a length of the concave portion, and a breadth of the convex portion along a direction orthogonal to the projecting direction is set to be slightly smaller than a breadth of the concave portion; and the movable lid is fixed to the chassis by screwing a screw through the central through hole of the convex portion into the tapped hole of the chassis in a state where the cord of the chassis is pulled out through the cord eject port and the movable lid is rotated to close the cord eject port and the convex portion is fitted into the concave portion. 
   The above constitution corresponds to one embodiment of the invention (see  FIGS. 1 to 9 ). With this constitution, the movable lid for enclosing the cord eject port is formed integrally on the rear cabinet via the thin hinge portion, whereby the number of parts is not increased, and the manufacturing cost is cheaper than the case where the conventional metallic plate is employed to enclose the cord eject port. Since the movable lid is formed in the shape of L-character of the lid main body and the auxiliary plate, the movable lid having the shape of L-character closes the corner portion from the lower face of the chassis to the rear face, except for the cord inserting port formed in the auxiliary plate, whereby it is possible to provide the magnetic tape device integrated television receiver or the stand-alone television receiver superior in respect of the accident prevention in accordance with the UL standards. 
   When the movable lid is rotated open around the thin hinge portion by using the tab portion jutted out from the movable lid, the cord eject port is opened, so that the cord is easily pulled out through the cord eject port. Also, when the movable lid is rotated closed around the thin hinge portion, the cord eject port is simply closed with the movable lid. The cord eject port is securely kept closed by fitting the convex portion of the movable lid into the concave portion of the chassis. 
   As described above, the movable lid is rotated open or closed around the thin hinge portion, whereby the positional relation between the central through hole of the convex portion and the tapped hole of the chassis is likely to be deviated along the opening or closing direction. However, since the length of the convex portion and the length of the concave portion along the projecting direction of the auxiliary plate (opening or closing direction) are set to be almost equal, the central through hole of the convex portion is matched almost concentrically with the tapped hole of the chassis only by fitting the convex portion into the concave portion. Thereby, it is possible to screw the screw through the central through hole of the convex portion into the tapped hole of the chassis efficiently and easily. 
   Herein, “set to be almost equal” means that the length of the convex portion and the length of the concave portion are set in a manner that the movable lid is not rotated open unexpectedly after the convex portion fits into the concave portion. For example, the length of the convex portion and the length of the concave portion may be set to be identical. Also, the length of the convex portion may be slightly short than that of the concave portion. 
   Further, since the breadth of the convex portion is set to be smaller than the breadth of the concave portion, and there is some gap between the convex portion and the concave portion along the breadth direction, the convex portion may be slightly deformed in the breadth direction to be easily fitted into the concave portion, even if the length of the convex portion is slightly larger than the length of the concave portion due to a dimensional error. 
   As described above, since the movable lid is securely fixed to the chassis by screwing a screw through the central through hole of the convex portion into the tapped hole of the chassis, the movable lid is not rotated open unexpectedly and with high safety, even though an excessive force is falsely applied on the movable lid by the user. 
   Incidentally, the front and rear cabinet may be molded of a flame retardant synthetic resin such as polystyrene. 
   A second aspect of the invention provides a cabinet cord eject structure including: a cord eject port penetrated in a rear part of a cabinet molded of a flame retardant synthetic resin; a chassis having a cord that is pulled out through the cord eject port; and a movable lid for closing the cord eject port, the movable lid being integrally formed via a thin hinge portion on the cabinet; wherein the movable lid is rotated open around the thin hinge portion; the chassis is inserted into the cabinet to be placed on a bottom plate portion of the cabinet and the cord is pulled out through the cord eject port; and the movable lid is rotated closed around the thin hinge portion to close the cord eject port. 
   With the above constitution, the movable lid for closing the cord eject port is integrally formed via the thin hinge portion on the cabinet, whereby the number of parts is not increased, and the manufacturing cost is cheaper than the case where the conventional metallic plate is employed to close the cord eject port. When the movable lid is rotated open around the thin hinge portion, the cord eject port is opened, so that the cord is easily pulled out through the cord eject port. Also, when the movable lid is rotated closed around the thin hinge portion, the cord eject port is simply closed in accordance with the UL standards. 
   A third aspect of the invention provides the cabinet cord eject structure wherein the movable lid includes a lid main body formed integrally on the bottom plate portion of the cabinet to be openable or closable via the thin hinge portion, and an auxiliary plate projecting substantially at right angles from a top end portion of the lid main body, the auxiliary plate being partially cut away to form a cord inserting part for passing the cord. 
   With the above constitution, since the movable lid is formed in the shape of L-character of the lid main body and the auxiliary plate, the movable lid having the shape of L-character securely closes the corner portion from the lower face of the chassis to the rear face, except for the cord inserting portion formed in the auxiliary plate. 
   A fourth aspect of the invention provides the cabinet cord eject structure wherein a tab portion is jutted out from a top of the movable lid. 
   With the above constitution, the movable lid is easily rotated open or closed by grasping the tab portion. 
   A fifth aspect of the invention provides the cabinet cord eject structure wherein a convex portion is protruded on a chassis opposed face of the auxiliary plate, and a concave portion is formed on a rear face of the chassis opposed to the convex portion, and the movable lid is rotated closed to fit the convex portion into the concave portion. 
   With the above constitution, the cord eject port is securely kept enclosed with the movable lid by fitting the convex portion of the movable lid into the concave portion of the chassis. 
   A sixth aspect of the invention provides the cabinet cord eject structure wherein a central through hole is bored in the convex portion, and a tapped hole is formed through the center of the concave portion in the chassis, and a screw is screwed through the central through hole of the convex portion fitted into the concave portion into the tapped hole of the chassis. 
   With the above constitution, since the movable lid is securely fixed to the chassis by screwing the screw through the central through hole of the convex portion into the tapped hole of the chassis, the movable lid is not rotated open unexpectedly and with high safety, even though an excessive force is falsely applied on the movable lid  11  by the user 
   A seventh aspect of the invention provides the cabinet cord eject structure, wherein the length of the convex portion along a projecting direction of the auxiliary plate is set to be almost equal to the length of the concave portion, and the breadth of the convex portion along the direction orthogonal to the projecting direction is set to be slightly smaller than the breadth of the concave portion. 
   With the above constitution, the movable lid is rotated open or closed around the thin hinge portion, whereby the positional relation between the central through hole of the convex portion and the tapped hole of the chassis is likely to be deviated along the opening or closing direction. However, since the length of the convex portion and the length of the concave portion along the projecting direction are set to be almost equal, the central through hole of the convex portion is matched almost concentrically with the tapped hole of the chassis only by fitting the convex portion into the concave portion. Thereby, it is possible to screw the screw through the central through hole of the convex portion into the tapped hole of the chassis efficiently and easily. 
   Also, since the breadth of the convex portion is set to be smaller than the breadth of the concave portion, and there is some gap between the convex portion and the concave portion along the breadth direction, the convex portion may be slightly deformed in the breadth direction to be easily fitted into the concave portion, even if the length of the convex portion is slightly larger than the length of the concave portion due to a dimensional error. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a side view, partially cut away, showing a cabinet cord eject structure according to one embodiment of the present invention; 
       FIG. 2  is a bottom view of the cord eject structure; 
       FIGS. 3A and 3B  are side views, partially cut away, showing an assembling procedure; 
       FIG. 4  is an enlarged bottom view of the same structure; 
       FIG. 5  is a cross-sectional view taken along line A—A in  FIG. 4 ; 
       FIG. 6  is an enlarged perspective view of the same structure in a state where a movable lid is closed; 
       FIG. 7  is an enlarged perspective view of the same structure in a state where the movable lid is open; 
       FIG. 8  is an exploded perspective view of the same structure; 
       FIG. 9A  is a front view of a concave portion,  FIG. 9B  is a cross-sectional view of a convex portion, and  FIG. 9C  is a cross-sectional view of the convex portion fitted into the concave portion; 
       FIG. 10A  is a front view of a concave portion in a comparative example,  FIG. 10B  is a cross-sectional view of a convex portion, and  FIG. 10C  is a cross-sectional view of the convex portion fitted into the concave portion; 
       FIG. 11  is a side view, partially cut away, showing a conventional example; 
       FIG. 12  is a bottom view of the conventional example; and 
       FIGS. 13A and 13B  are side views, partially cut away, showing an assembling procedure. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIGS. 1 and 2  show a cabinet cord eject structure  1  in a magnetic tape device integrated television receiver (so-called televideo). A movable lid  11  for closing a cord eject port  6  is formed integrally with a rear cabinet  1 B via a thin hinge portion  12 . Except for the above constitution, the cord eject structure is almost the same as shown in  FIGS. 11 and 12 , so the same or similar parts are designated by the same numerals as in  FIGS. 11 and 12 , and not described here. 
   In an assembling procedure, the movable lid  11  is rotated open (direction “a”) around the thin hinge portion  12  to insert a chassis  5  into the rear cabinet  1 B as shown in  FIG. 3A . Then, an AC cord  4  is pulled out through the cord eject port  6 , as shown in  FIG. 3B . Then, the chassis  5  is disposed on a bottom plate portion  1   a  of the rear cabinet  1 B, and the movable lid  11  is rotated closed (direction “b”) around the thin hinge portion  12  to close the cord eject port  6 . 
   With the above constitution, since the movable lid  11  is formed integrally with the rear cabinet  1 B via the thin hinge portion  12 , the number of parts is not increased and the manufacturing cost is cheaper than the case where the conventional metallic plate  8  is employed to close the cord eject port  6  (see  FIG. 11 ). If the movable lid  11  is rotated open (direction “a”) around the thin hinge portion  12 , the cord eject port  6  is opened, so that the AC cord  4  is easily pulled out through the cord eject port  6 . Also, if the movable lid  11  is rotated closed (direction “b”) around the thin hinge portion  12 , the cord eject port  6  is simply closed. 
   The movable lid  11  includes a lid main body  11 A formed integrally with the bottom plate portion  1   a  to be openable or closable via the thin hinge portion  12 , and an auxiliary plate  11 B rising at rights from the top end portion of the lid main body  11 A, as shown in  FIGS. 4 to 7 . The auxiliary plate  11 B is partially cut away to form a cord inserting portion  11   a  for passing the AC cord  4 . 
   With the above constitution, since the movable lid  11  is formed in the shape of L-character by the lid main body  11 A and the auxiliary plate  11 B, the movable lid  11  having the shape of L-character fully closes a corner portion from a lower face  5   a  of the chassis  5  to a rear face  5   b , except for the cord inserting portion  11   a  formed in the auxiliary plate  11 B, whereby it is possible to provide a “televideo” that is superior in respect of the accident prevention in accordance with the UL standards. 
   A tab portion  13  is jutted out from a top end portion of the movable lid  11 , as shown in  FIG. 5 . The movable lid  11  is easily rotated open or closed by using the tab portion  13 . 
   Along circular convex portion  15  is protruded from a circular protrusion  14  formed integrally with a chassis opposed face of the auxiliary plate  11 B, and a long circular concave portion  16  is formed on the rear face  5   b  of chassis  5  opposed to the convex portion  15 , as shown in  FIG. 8 . The cord eject port  6  is securely kept closed with the movable lid  11  by rotating the movable lid  11  closed (direction “b”) to fit the convex portion  15  into the concave portion  16  (see  FIG. 5 ). 
   Also, a central through hole  15   a  is bored in the convex portion  15 , and a tapped hole  16   a  is formed through the center of the concave portion  16  in the chassis  5 . Since the movable lid  11  is securely fixed to the chassis  5  by screwing a screw  17  through the central through hole  15   a  of the convex portion  15 , which is fitted into the concave portion  16 , into the tapped hole  16   a  of the chassis  5 , the movable lid  11  is not rotated open unexpectedly and with high safety, even though an excessive force is falsely applied on the movable lid  11  by the user. 
   Herein, it is common that the length H 1  of the convex portion  15  along the opening or closing direction a, b is set to be smaller than the length H 2  of the concave portion  16 , like a comparative example as shown in  FIGS. 10A and 10B . In this case, since the movable lid  11  is rotated open or closed along the opening or closing direction a, b around the thin hinge portion  12 , an axial center  01  of the central through hole  15   a  in the convex portion  15  is likely to be deviated by a difference α between the lengths H 1  and H 2  from an axial center O 2  of the tapped hole  16   a  in the chassis  5 , when the convex portion  15  is fitted into the concave portion  16  as shown in  FIG. 10C . Consequently, it is difficult to screw the screw  17  through the central through hole  15   a  into the tapped hole  16   a  due to the difference a, degrading the operation efficiency. 
   On the contrary, according to the embodiment of the invention, the length H 1  of the convex portion  15  along the opening or closing direction a, b is set to be almost equal to the length H 2  of the concave portion  16 , as shown in  FIGS. 9A and 9B . Hence, when the convex portion  15  is fitted into the concave portion  16  as shown in  FIG. 9C , the axial center  01  of the central through hole  15   a  in the convex portion  15  is matched almost concentrically with the axial center O 2  of the tapped hole  16   a  in the chassis  5 , so that the screw  17  is screwed through the central through hole  15   a  into the tapped hole  16   a  efficiently and easily. 
   Also, the breadth L 1  of the convex portion  15  along the direction c, d orthogonal to the opening or closing direction a, b is set to be slightly smaller than the breadth L 2  of the concave portion  16 , and there is some gap β across the breadth L 1 , L 2  between the convex portion  15  and the concave portion  16 . For example, each gap β may be 0.2 mm. Therefore, even if the length H 1  of the convex portion  15  is slightly larger than the length H 2  of the concave portion  16  due to a dimensional error, the convex portion  15  may be slightly deformed in the direction of breadth L 1  to be easily fitted into the concave portion  16 . 
   The convex portion  15  and the concave portion  16  are formed in the shape of long circle, that is, each of the convex portion and the concave portion, in a plane view, have two straight sides opposed in parallel and two arc sides each of which connects ends of the straight sides. Therefore, convex portion is prevented from rotating with respect to the concave portion when screwing the screw  17 . 
   Though in the above embodiment, the convex portion  15  and the concave portion  16  are formed in the shape of long circle, the invention is not limited to this embodiment, but they may be formed in the shape of ellipse or rectangle, for example. 
   Though the so-called televideo has been exemplified above, this invention is not limited to the televideo, but maybe applied to a stand-alone television receiver. 
   As was described above, according to the first aspect of the invention, the movable lid for closing the cord eject port is formed integrally on the rear cabinet via the thin hinge portion, whereby the number of parts is not increased, and the manufacturing cost is cheaper than the case where the conventional metallic plate is employed to close the cord eject port. Since the movable lid is formed in the shape of L-character of the lid main body and the auxiliary plate, the movable lid having the shape of L-character closes the corner portion from the lower face of the chassis to the rear face, except for the cord inserting port formed in the auxiliary plate, whereby it is possible to provide the magnetic tape device integrated television receiver or the stand-alone television receiver superior in respect of the accident prevention in accordance with the UL standards. 
   If the movable lid is rotated open around the thin hinge portion by grasping the tab portion jutted out from the movable lid, the cord eject port is opened, so that the cord is easily pulled out through the cord eject port. Also, if the movable lid is rotated closed around the thin hinge portion, the cord eject port is simply closed with the movable lid. The cord eject port is securely kept closed by fitting the convex portion of the movable lid into the concave portion of the chassis. 
   The movable lid is rotated open or closed around the thin hinge portion, whereby the positional relation between the central through hole of the convex portion and the tapped hole of the chassis is likely to be deviated along the opening or closing direction. However, since the length of the convex portion and the length of the concave portion along the opening or closing direction are set to be almost equal, the central through hole of the convex portion is matched almost concentrically with the tapped hole of the chassis only by fitting the convex portion into the concave portion. Thereby, it is possible to screw a screw through the central through hole of the convex portion into the tapped hole of the chassis efficiently and easily. 
   Since the breadth of the convex portion is set to be smaller than the breadth of the concave portion, and there is some gap between the convex portion and the concave portion along the breadth direction, the convex portion may be slightly deformed in the breadth direction to be easily fitted into the concave portion, even if the length of the convex portion is slightly larger than the length of the concave portion due to a dimensional error. 
   Since the movable lid is securely fixed to the chassis by screwing a screw through the central through hole of the convex portion into the tapped hole of the chassis, the movable lid is not rotated open unexpectedly and with high safety, even though an excessive force is falsely applied on the movable lid by the user. 
   According to the second aspect of the invention, the movable lid for closing the cord eject port is integrally formed via the thin hinge portion on the cabinet, whereby the number of parts is not increased, and the manufacturing cost is cheaper than the case where the conventional metallic plate is employed to close the cord eject port. If the movable lid is rotated open around the thin hinge portion, the cord eject port is opened, so that the cord is easily pulled out through the cord eject port. Also, if the movable lid is rotated closed around the thin hinge portion, the cord eject port is simply closed in accordance with the UL standards. 
   According to the third aspect of the invention, since the movable lid is formed in the shape of L-character of the lid main body and the auxiliary plate, the movable lid having the shape of L-character securely closes the corner portion from the lower face of the chassis to the rear face, except for the cord inserting portion formed in the auxiliary plate. 
   According to the fourth aspect of the invention, the movable lid is easily rotated open or closed by grasping the tab portion. 
   According to the fifth aspect of the invention, the cord eject port is securely kept closed with the movable lid by fitting the convex portion of the movable lid into the concave portion of the chassis. 
   According to the sixth aspect of the invention, since the movable lid is securely fixed to the chassis by screwing the screw through the central through hole of the convex portion into the tapped hole of the chassis, the movable lid is not rotated open unexpectedly and with high safety, even though an excessive force is falsely applied on the movable lid by the user. 
   According to the seventh aspect of the invention, the movable lid is rotated open or closed around the thin hinge portion, whereby the positional relation between the central through hole of the convex portion and the tapped hole of the chassis is likely to be deviated along the opening or closing direction. However, since the length of the convex portion and the length of the concave portion along the opening or closing direction are set to be almost equal, the central through hole of the convex portion is matched almost concentrically with the tapped hole of the chassis only by fitting the convex portion into the concave portion. Thereby, it is possible to screw the screw through the central through hole of the convex portion into the tapped hole of the chassis efficiently and easily. 
   Also, since the breadth of the convex portion is set to be smaller than the breadth of the concave portion, and there is some gap between the convex portion and the concave portion along the breadth direction, the convex portion may be slightly deformed in the breadth direction to be easily fitted into the concave portion, even if the length of the convex portion is slightly larger than the length of the concave portion due to a dimensional error.