Abstract:
A plug comprising a cover portion for covering an opening of an aperture; elastically deflectable legs extending from the under side of the cover portion; and anchoring nails laterally projecting from the legs for engaging the edge of the aperture characterized in that each of the legs is provided with at least one projections laterally extending therefrom in same direction as that of the anchoring nail formed on the corresponding leg beyond the tip of the anchoring nail.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a plug for closing an aperture, and more particularly to a blind plug for closing an aperture which is not used in normal case and formed in structural members of articles such as automobiles, electronic instruments and the like. 
     2. Description of Background Art 
     Recently, a shift lock mechanism for preventing the unintentional start of a vehicle owing to an erroneous operation of an automatic transmission controller of an automatic transmission. The shift lock system is intended to prevent a driver from doing the shifting operation from the “P” (parking) position without depressing the brake pedal on start in order to cope with the erroneous operation between the brake pedal and the accelerator pedal. 
     There is a key interlock mechanism (so-called a shift lock apparatus with key inter lock) adopted as an erroneous operation preventing apparatus in relation to the shift lock mechanism. The key interlock mechanism is structured so that it prevents the shift lever of the automatic transmission during parking at “P” position and that it prevents the ignition key from being pulled out without shifting the shift lever to the “P” position. 
     For adopting the mechanisms mentioned above, there is provided within the automatic transmission controller a solenoid for limit the operation of the shift lever. The operation of the shift lever from the “P” position is limited corresponding to the positions of the brake pedal and the ignition key due to an electrical connection between the solenoid and the brake pedal. 
     In such a shift lock apparatus, there is provided a mechanism for forcedly manually releasing the shift lock that is used in a occasion which would be happened for example in the electric circuit (for example exhaustion of battery charge). The manual releasing mechanism has an aperture formed for example in a decoration panel of the automatic transmission controller for receiving the ignition key used as a releasing means. 
     In view of prevention of crime as well as aesthetics, the aperture is normally covered or closed by a blind cover (hereinafter referred to as a “plug”) with the plug being inserted in the aperture. The plug of the prior art has two legs extending from the underside of a cover portion having a substantially same configuration of the opening of the aperture. One anchoring nail is formed on each leg projecting outward therefrom so as to be able to engage the peripheral edge of the opening of the aperture formed in the decoration panel of the automatic transmission controller. 
     When any trouble would be happened for example in the electric circuit of the shift lock apparatus and thus the manual release of the shift lock is desired, it can be achieved by removing the plug from the decoration panel with using a suitable removing tool such as a screw driver and then inserting the ignition key into the aperture. 
     However, a conventional plug has a defect such that it is liable to suddenly spring out from the aperture when removing the plug therefrom. The plug sprung out from the aperture is sometimes lost or hits a face or an eye of a worker. This is because that there is only one anchoring nail is provided on each leg of the plug and no means is provided on the conventional plug for preventing its spring out from the aperture. 
     SUMMARY OF THE INVENTION 
     It is, therefore, an object of the present invention to provide a plug which can prevent it from unintentionally spring out from an aperture when being removed therefrom and from being lost as well as can improve the safety of a worker. 
     For achieving the object of the present invention, there is provided according to the present invention a plug comprising a cover portion for covering an opening of an aperture; elastically deflectable legs extending from the under side of the cover portion; and anchoring nails laterally projecting from the legs for engaging the edge of the aperture characterized in that each of the legs is provided with at least one projections laterally extending therefrom in same direction as that of the anchoring nail at a position nearer the tip of the leg than that of the anchoring nail. 
     According to the invention of claim  1 , when a worker pulls the cover portion of the plug out from the aperture in order to remove the plug therefrom, it is possible to prevent the plug from spring out from the aperture due to the engagement of the projection formed on the leg of the plug with the edge of the aperture and also possible to turn the removal direction laterally so as to prevent the plug from hitting the face especially an eye of the worker. 
     According to the invention of claim  2 , the projection can be engaged with the edge of the aperture after the anchoring nails having been released from the engagement with the edge of the aperture. 
     According to the invention of claim  3 , it is possible to make the engagement of projection with the edge of the aperture more easy and thus to make the plug to more firmly change the removing direction of the plug laterally. 
     According to the invention of claim  4 , it is possible to normally close the aperture formed in the decoration cover of the automatic transmission controller in manner superior in view of prevention of crime as well as aesthetics. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     One preferred embodiment of the present invention will be described with reference to the accompanied drawings in which; 
     FIG.  1 ( a ) is a perspective view of the plug of the present invention; 
     FIG.  1 ( b ) is a cross-sectional view taken along a line A—A; 
     FIG. 2 is a cross-sectional view showing a condition of a plug of the present invention prior to it being mounted in an aperture of a decoration panel of the automatic transmission controller; 
     FIG. 3 is a cross-sectional view showing a condition of the plug of the present invention mounted in the aperture of the decoration panel of the automatic transmission controller; 
     FIG. 4 is a cross-sectional view showing a condition of the plug of the present invention partially removed from the aperture of the decoration panel of the automatic transmission controller; 
     FIG. 5 is a cross-sectional view showing a condition of the plug of the present invention further removed from the aperture of the decoration panel of the automatic transmission controller; 
     FIG. 6 is a partially cross-sectional view of the automatic transmission controller to which the plug of the invention applied; 
     FIG. 7 is a plan view of the automatic transmission controller of FIG. 6; 
     FIG. 8 is a perspective view of the automatic transmission controller of FIG. 6; 
     FIG. 9 is a schematic view showing the shift lock mechanism arranged within the automatic transmission controller; and 
     FIG. 10 is a side-elevational view of a detent plate arranged within the automatic transmission controller. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 6 is a partially cross-sectional view of an automatic transmission controller  1  to which a plug of the present invention is applied. The automatic transmission controller  1  mainly comprises a shift lever  2 , a housing  3  containing a swing mechanism of the shift lever  2 , and shift lock apparatus (including a solenoid  4  and manual release mechanism  5 ) contained in the housing  3 . 
     The housing  3  forms a box of the automatic transmission controller  1  comprising a decoration panel  3   a , and a console portion  3   b  having a bracket to be secured to a base bracket  17  mounted on a body of a vehicle. As shown in FIGS. 7 and 8, the decoration panel  3   a  is formed with a shift range indicator  3   aa , a slit  3   ab  for slidably receiving the shift lever  2 , and an aperture  8  for receiving an ignition key when any trouble would be happened. The aperture is adapted to be inserted and closed by a plug in a manner hereinafter described in detail. 
     The shift lever  2  can be swung around a pivot pin C and has a shift knob  6  on the distal end thereof. The shift lever has a hollow shaft  2   c  in which a detent rod  2   b  is slidably contained. The detent rod  2   b  is normally urged upward by a spring (not shown) and can be lowered within the hollow shaft  2   c  against the urging force when a release button  6   a  arranged on the shift knob  6  is pushed. 
     A detent pin  2   a  projects from the side of the detent rod  2   b  toward a detent plate  9  and is moved vertically by the detent rod  2   b . The detent plate  9  is formed with a recess  9   a  corresponding to the shift ranges of the transmission as shown in FIG.  10  and has a function for preventing the swing of the shift lever  2  from the “P” range to the “R” range without lowering the detent pin  2   a  by a predetermined distance “I” by pushing the release button  6   a.    
     The shift lock apparatus is adapted to prevent unintentional start of a vehicle due to an erroneous operation of the automatic transmission controller  1  and thus is constructed so that the shift change cannot be carried out without the ignition key being inserted in the key cylinder as wall as the brake pedal being depressed when the shift lever  2  is positioned at the “P” (parking) range. 
     That is, a limiting member  7  is arranged for preventing the detent pin  2   a  from being lowered by the distance “I” within the recess  9   a  of the detent plate  9  when the shift lever  2  is positioned at the “P” range. The limiting member  7  allows the lowering motion of the detent pin  2   a  by the predetermined distance “I” by being pivoted toward an arrow “a” by a rotation of an operating arm  4   a  retracting from a position of FIG. 6 (toward a direction of an arrow “b” in FIG. 9) due to actuation of the solenoid  4  when the insert of the ignition key into the key cylinder, the positioning of the shift lever  2  at the “P” range as well as the depression of the brake pedal are detected. 
     The limiting member  7  has an upper end for limiting the lowering motion of the detent pin  2   a  and a pin mounted on the lower end thereof for engaging with the operating arm  4   a . The left end of the limiting member  7  is adapted to be engaged with a manual release means  5  hereinafter described. Due to the structure, the limiting member  7  is rotated toward the arrow “a” around a pivot pin C 1  by the lowering motion of the manual releasing means  5  in addition to the retracting motion of the operating arm  4   a  of the solenoid. 
     The automatic transmission controller further has means for manually release the shift lock when the actuation of the solenoid is failed by any trouble. 
     That is, as shown in FIG. 9, the shift lock can be released by inserting the ignition key  10  into the aperture  8  leading to the manual releasing means  5  from the upper surface of the decoration panel  3   a  and then by lowering the manual releasing means  5  in order to rotate the limiting member  7  toward the direction “a”. The manual releasing means  5  can be returned to its original position by a return spring  5   b  arranged at the top of the manual releasing means  5  after the ignition key  10  having been pulled out from the aperture  8 . 
     As shown in FIGS.  1 ( a ) and  1 ( b ), the plug  11  of the present invention comprises a cover portion  12 , two legs  13   a  and  13   b , anchoring nails  14   a  and  14   b , and projections  15   a  and  15   b . These elements are made of plastic and formed integrally. 
     The cover portion  12  formed as substantially same configuration as that of the opening of the aperture  8  so as to be able to closely fitted within the opening of the aperture  8  when the plug  11  is inserted in the aperture  8 . One side of the cover portion  12  is recessed to form a notch  12   a  allowing reception of a tip of a suitable tool such as a screw driver when removing the plug  11  from the aperture (see FIG.  4 ). 
     The legs  13   a  and  13   b  extend downward from the underside of the cover portion  12  with spaced from each other at a predetermined distance and are elastically deflected as shown by dotted lines in FIG. 2. A numeral  3   ab  denotes a recess formed in the decoration panel  3   a  around the aperture  8 . 
     One leg  13   b  is formed with an anchoring nail  14   b  projecting from the leg  13   b  and the other leg  13   a  is formed with an anchoring nail  14   a  and projections  15   a  and  15   b . As shown in FIG. 3, the anchoring nails  14   a  and  14   b  engage a peripheral edge  3   aa  of the aperture  8  of the decoration panel  3   a  and secure the plug  11  in position when the plug  11  is fully inserted in the aperture  8 . 
     In order to remove the plug  11  closing the aperture  8  as shown in FIG. 3, the tip of any tool such as a screw driver is inserted in the notch  12   a  and lift the plug  11  with a lever action as shown in FIG.  4 . 
     When the plug  11  is lifted, the legs  13   a  and  13   b  are elastically deflected inward each other by a projecting height of the anchoring nails  14   a  and  14   b . During this lifting operation, the plug  11  are liable to spring out from the aperture  8  due to the spring forces caused by the deflection of the legs  13   a  and  13   b . During which, however, the projection  15   a  engages the peripheral edge of the aperture  8  as shown in FIG.  4  and thus keeps the plug  11  in this position. After this, the plug  11  can be pulled out by fingers. 
     Accordingly, the worker can know that the anchoring nails  14   a  and  14   b  are disengaged from the peripheral edge of the aperture  8  and therefore it is possible to prevent the plug  11  from spring out the aperture  8  as well as the plug from hitting a face of the worker. 
     Formed below the projection  15   a  is an another projection  15   b  extending in a same direction as that of the anchoring nail  14   a  and the projection  15   a . Since this projection  15   b  is formed beyond a large amount the tips of the anchoring nail  14   a  and the projection  15   a , the projection  15   b  can firmly engage the peripheral edge of the aperture  8  as shown in FIG.  5 . Thus it is possible to securely prevent the spring out of the plug  11  even though the worker would strongly lift the plug  11  and also to turn the plug  11  to a direction “d” due to an abutment of the projection  15   b  with the peripheral edge  3   aa  of the aperture  8  of the decoration panel  3   a.    
     The turning of the plug  11  toward the direction “d” can further improve the function of preventing the plug  11  from hitting a face of the worker. The amount of projecting height of the projection  15   b  may be substantially same as those of the anchoring nail  14   a  and the projection  15   a . However, it is preferable to extend the projection  15   b  beyond a large amount the tips of the anchoring nail  14   a  and the projection  15   a  in order to securely turn the plug  11  toward the direction “d”. 
     According to the present invention, the provision of the projections  15   a  and  15   b  enable the worker to feel that the plug  11  is ready for removal. 
     In addition, since the spring out of the plug  11  is prevented according to the present invention, it is possible to prevent the plug  11  from being lost. 
     Although the embodiment of the present invention has been illustrated and described with respect to a special example of the plug, it is to be noted that the present invention is not limited to that embodiment. For example, it is possible to provide three or more projections on one leg  13   a  or to provide a projection on the other leg  13   b . Alternately, it is possible to provide only one projection  15   b  on the leg  13   a  (of course, the anchoring nail  14   a  is provided) and to omit the projection  15   a.    
     In addition, it is possible to omit the projection  15   b  if the effect of turning the plug  11  is not desired. Furthermore, legs  13   a  and  13   b  may be formed separately from the cover portion  12  or only one of the legs  13   a  and  13   b  may be made of elastic material.