Patent Publication Number: US-6981623-B2

Title: Mechanism for engaging portable equipment against a belt clip

Description:
This is a divisional of U.S. patent application Ser. No. 10/046,479, filed on Oct. 19, 2001, now U.S. Pat. No. 6,722,539, entitled MECHANISM FOR ENGAGING PORTABLE EQUIPMENT AGAINST A BELT CLIP, which is hereby incorporated by reference in its entirety. 

   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   This invention relates to a mechanism for removably engaging an item of portable equipment such as a transceiver or the like with a belt clip installed on either a band or a belt. 
   2. Description of the Prior Art 
   The rapid progress or advancement in a semiconductor manufacturing technology in recent years has caused a remarkable small-sized formation of portable wireless machines such as a transceiver or various kinds of measuring equipment, and this progress has further caused a portable system with a belt clip to be widely used. 
   That is, these types of portable equipment are most conveniently installed at either a waist part or a belly part of a person with belt clip due to the fact that their size or weight is too large or heavy for being stored in a pocket in its-non-used state, or when they are put in a bag or the like, they are inconveniently taken out and used every time they are needed. 
   Then, with this kind of belt clip, there are provided one system in which the belt clip is directly fixed to either a casing surface of a portable equipment or its protection cover in advance and the other system in which a convenient engaging part arranged independently at the portable equipment is engaged with the belt clip. 
   In the former system, since the entire belt clip is integrally assembled with the portable equipment, there occurs a certain disadvantage in convenience of use at the time of utilization of the portable equipment, and further since the belt clip is installed at the belt with its clip side holding either the band or the belt, an inconvenience state created in which smooth fitting or removing cannot be carried out. 
   In turn, in the case of latter system, the portable equipment is merely provided with a convenient and small engaging part, a mechanism that can be easily fitted or disengaged between the engaging part and the belt clip can be independently constituted, so that such disadvantage and inconvenience in operation are not produced. 
   In the case of the engaging mechanism in which the belt clip and the portable equipment are installed independently, it is required to perform an easy engaging or disengaging operation and the belt clip is not easily removed under vibration and the like. 
   Accordingly, although various kinds of mechanisms have been proposed as the aforesaid engaging mechanism, the system having the configuration shown in  FIGS. 10 to 13  is shown as one example. 
   At first,  FIG. 10  shows a mechanism applied at the portable equipment, where (A) is a substantial front elevational view for showing the portable equipment; (B) is a sectional view taken along an arrow line Y—Y in (A); and (C) is a sectional view taken along an arrow line X—X in (A). 
   In this figure,  101  denotes a portable equipment,  102  denotes a protrusion fixed with a screw at a rear surface of a casing of the portable equipment  101 , where the protrusion  102  is comprised of a base  103  corresponding to a fixing plate, a cylindrical short column  104  and a flange  105 . 
   In addition, the flange  105  is comprised of a disc  106  and an annular frame  107  formed around the circumferential edge of the disc, where the annular frame  107  is formed with a discontinuous segment  108  at its upper part. 
   In turn,  FIG. 11  shows a mechanism at the belt clip, where (A) is a left side elevational view for showing the belt clip; (B) is a front elevational view; (C) is a sectional view taken along an arrow line Y—Y in (B); and (D) is a sectional end view taken along an arrow line X—X in (B). 
   In this figure,  201  denotes a belt clip,  202  denotes a clip and  203  denotes an engaging plate for engaging with the portable equipment  101 . 
   In this figure, the clip  202  and the engaging plate  203  are integrally formed with bearing plates  204  and  205  at both sides near their upper positions of their opposing faces, wherein both bearing plates  204 ,  205  are rotatably connected at a shaft  206  under a state in which both bearing plates  205  at the engaging plate  203  fit both bearing plates  204  of the clip  202  inside. 
   Then, a twisted coil spring  207  is fitted outside between both bearing plates  204  at the shaft  206 , both arms of the twisted coil spring  207  press and bias against each of the inner surface of the clip  202  and the inner surface of the engaging plate  203 . 
   In addition, the lower end of the clip  202  is integrally formed with an L-shaped hook  208  facing inside, and a biasing force attained by both arms of the twisted coil spring  207  pushes the extremity end of the hook  208  against the engaging plate  203  under a principle of lever with the shaft  206  being applied as a fulcrum. 
   Accordingly, although each of the plate surfaces of the clip  202  and the engaging plate  203  is normally in a parallel state to each other, when the upper sides of the clip  202  and the engaging plate  203  are held with fingers to cause them to be approached to each other, the extremity end of the clip  202  is opened, resulting in that a belt is received between it and the engaging plate  203  under this opened state and after this operation, when the holding pressure by the fingers is released, the belt clip  201  can be installed at the belt. 
   The front surface of the engaging plate  203  is formed with a small-protrusion type claw  209  and an engaging part  210 . 
   In this case, the claw  209  has such a shape as one in which a width (w) of the claw  209  is narrower than a width of the discontinuous segment  108  of the annular frame  107  formed at the flange  105  of the portable equipment  101 , a length (a) of the claw  209  is smaller than an inner diameter of the annular frame  107 , and a height (h) of the claw is set to be lower than a height of the annular frame  107 , wherein the claw is formed at the central position of the lower region of the engaging plate  203 . 
   In addition, the engaging part  210  is comprised of frames  211 ,  212  arranged at both sides and a front plate  214  formed with a substantial U-shaped recess  213 , and this is constituted as a cylindrical member at the surface of the engaging plate  203 . 
   In such a configuration comprised of the protrusion  102  at the portable equipment  101  and the engaging plate  203  at the belt clip  201 , when the portable equipment  101  is set upside down (the discontinuous segment  108  of the annular frame  107  at the protrusion  102  being set at a lower side) and its flange  105  is fitted into the engaging part  210  at the belt clip  201  under a state in which the belt clip  201  is being installed at the belt  220 , as shown in  FIG. 12 , the flange  105  is guided down to the lower side of the engaging part  210  while the short column part  104  of the protrusion  102  is being guided by the recess  213 . 
   Then, the discontinuous segment  108  at the annular frame  107  of the portable equipment  101  causes the entire claw  209  at the belt clip  201  to be inserted into the annular frame  107  and then the short column  104  at the portable equipment  101  under this state is engaged with the lower-most part of the recess  213  of the belt clip  201 . 
   Then, as shown in  FIG. 13 , when the portable equipment  101  is turned from the aforesaid state by 180°, the annular frame  107  at the flange  105  is naturally turned around the claw  209  at the belt clip  201 , and the discontinuous segment  108  is positioned at the upper side of the claw  209 . 
   Accordingly, the lower side of the annular frame  107  of the flange  105  at the portable equipment  101  is engaged with the claw  209  at the belt clip  201 , its short column  104  is restricted under a diagonal relation where it can be moved upward only by the recess  213  at the belt clip  201 , resulting in that the portable equipment  101  becomes positioned such that the belt clip  201  can be removed only after the portable equipment  101  is turned again by 180°. 
   That is, the portable equipment  101  is engaged with the belt clip  201  under a locked state where a removal stopping is applied. 
   In turn, when the portable equipment  101  is to be removed, it is turned by 180° from the aforesaid locked state to cause the state shown in  FIG. 12  to be attained, resulting in that when the portable equipment  101  is to be used, the operation is performed to pull it upward to enable the engaged state against the belt clip  201  to be released. 
   As another practical example of the engaging mechanism when the belt clip and the portable equipment are made independent from each other, there is also provided another system in which they are released from their engaged state through a button handling operation. 
   More practically, the belt clip is provided with a claw biased by a spring mechanism, the claw is pushed in when a hook installed on the portable equipment is engaged with the belt clip, the claw returns when a recess formed at the hook reaches the claw and the claw is engaged with the recess to cause it to be locked, wherein there is also provided a mechanism at the belt clip to cause the aforesaid locked state to be optionally released through the button handling operation, wherein when the portable equipment is used, the button is depressed to cause the claw to be forcedly drawn from the recess or the like and the hook can be removed from the belt clip. 
   Accordingly, in view of its principle, a general type of engaging/releasing mechanism widely applied in other fields is applied. 
   In accordance with the engaging mechanism shown in  FIGS. 10 to 13 , it is necessary to turn the portable equipment  101  by 180° when the portable equipment  101  is fixed to or removed from the belt clip  201  and this shows an inconvenience that the turning operation must be carried out every time the fixing or removal operation is performed. 
   In particular, at the time of the belt clip fixing operation, the flange  105  of the portable equipment  101  is normally engaged under a state in which it is stored at the engaging part  210  at the belt clip  201 , although if it is forgotten to turn the portable equipment  101 , the lock mechanism does not engage and the portable equipment  101  is displaced and dropped due to vibration or the like to cause either damage or trouble to be frequently generated. 
   In turn, in the case of the button operating type engaging mechanism, it is possible to perform a locking operation without turning the portable equipment, so that the aforesaid inconvenience or disadvantage is not generated. However, when the portable equipment is removed, both the pulling-out operation for the hook and the button operation must be carried out concurrently and it creates an inconvenience in that the removing operation must always be carried out with both hands. 
   Further, due to application of both hands, it is necessary that the installing position of the belt clip is always set to face against the front part of the belly or near the belly and if an operator performs other activities while keeping a forward inclined attitude, some troubles are frequently produced. 
   SUMMARY OF THE INVENTION 
   In view of the foregoing, the present invention has been created to provide a rational engaging mechanism in which the belt clip and the portable equipment are set independently, wherein it is possible to engage or lock the portable equipment without turning it and the fixing operation is made simple to enable a disengagement of the lock to be prevented. 
   A first embodiment of the subject invention provides an engaging mechanism for portable equipment in respect to a belt clip of a system in which the portable equipment is provided with a protrusion comprised of a short column and a flange, a plate surface of the belt clip is formed with an engaging part composed of frames arranged at both sides and a front plate formed with a substantial U-shaped recess, the short column at the portable equipment is guided by the recess at the belt clip to cause the flange to be fitted to and held at the engaging part, thereby the portable equipment is removably attached to the belt clip characterized in that the flange at the portable equipment is constituted by a disc and the annular frame formed at the circumferential edge of the disc, the upper surface of the protrusion is in continuous with the end surface of the annular frame under a state in which it is protruded inwardly from the annular frame, a protrusion having its circumferential side applied as a slant surface is formed, and in turn, the belt clip is formed with a claw having the side surface corresponding to the released side of the recess at the engaging part applied as a slant surface and the opposite side surface applied as an engaging surface against the annular frame in an area opposing against a space between an inward directed surface of the protrusion and the annular frame under a state in which the flange at the portable equipment reaches the fitting limit part of the engaging part, its plate surface is formed with a substantial U-shaped slit containing the claw inside to constitute a resilient cantilever beam. 
   According to this embodiment, when the flange on the portable equipment is fitted to the engaging part on the belt clip, the annular frame at the flange causes the cantilever beam to be flexed while being slidingly contacted with the slant surface of the claw formed at the belt clip and when the claw rides over the annular frame and is fitted between the protrusion of the flange and the annular frame, the resilient cantilever beam returns back to its original state. 
   Accordingly, under this state, the claw is present inside the annular frame and also in the recess except the protrusion and the engaging surface of the claw is engaged with the inner wall surface of the annular frame so long as the flange is not turned by about 180°, so that the flange is not pulled out of the annular frame. That is, the portable equipment becomes locked with the belt clip. 
   In turn, if the flange is turned by about 180° from its position after it is fitted, the slant surface formed at the side surface of the protrusion of the flange cause the cantilever beam to be flexed while being slidingly contacted under a state in which it rides over the claw at the belt clip from its circumferential direction, and the upper surface of the protrusion at the flange rides over the upper side of the claw. 
   Then, since the upper surface of the protrusion at the flange is continuous with the end surface of the annular frame, if the flange turned by about 180° is moved toward the released side of the recess at the belt clip as it is, the flange can be removed from the engaging part. That is, the locked state is released and the portable equipment can be removed from the belt clip. 
   A second embodiment of the subject invention provides an engaging mechanism of a portable equipment in respect to a belt clip of a system in which the portable equipment is provided with a protrusion comprised of a short column and a flange, a plate surface of the belt clip is formed with an engaging part composed of frames arranged at both sides and a front plate formed with a substantial U-shaped recess, the short column at the portable equipment is guided by the recess at the belt clip to cause the flange to be fitted to and held at the engaging part, thereby the portable equipment is removably attached to the belt clip characterized in that the flange at the portable equipment is constituted by a disc and the annular frame formed at the circumferential edge of the disc, the upper surface of the protrusion is in continuous with the end surface of the annular frame under a state in which it is protruded inwardly from the annular frame, and in turn, the belt clip is formed with a claw having the side surface corresponding to the released side of the recess at the engaging part and both side surfaces adjacent to the former side surface applied as slant surfaces and having the other side surface as an engaging surface against the annular frame in an area opposing against a space between an inward directed surface of the protrusion and the annular frame under a state in which the flange at the portable equipment reaches the fitting limit part of the engaging part, its plate surface is formed with a substantial U-shaped slit containing the claw inside to constitute a resilient cantilever beam. 
   The second embodiment differs from the first embodiment in view of the fact that both side surfaces at the claw of the belt clip are applied as slant surfaces in opposition to the first invention in which the slant surface is arranged at the circumferential side of the protrusion of the flange at the portable equipment, while the other composing elements in the second embodiment are the same as that of the first embodiment. 
   More practically, their differences merely consist in the fact that when the portable equipment is removed from the belt clip, the slant surface is formed at the protrusion of the flange to cause the protrusion of the flange to be ridden over the claw of the belt clip, or the slant surface is formed at the claw of the belt clip, and a function attained by each of the mechanism elements at the stage of fixing or removing is the same as that of the first invention except the above different points. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a view for showing a mechanism on a portable equipment in accordance with a preferred embodiment 1 of the present invention, wherein (A) is a substantial front elevational view for showing a portable equipment; (B) is a sectional view taken along an arrow line Y—Y in (A); (C) is a sectional view taken along an arrow line X—X in (A); and (D) is a sectional view taken along an arrow line Z—Z in (A). 
       FIG. 2  is a view for showing a mechanism at a belt clip in accordance with a preferred embodiment of the present invention, wherein (A) is a left side elevational view for showing the belt clip; (B) is a front elevational view; (C) is a sectional view taken along an arrow line Y—Y in (B); and (D) is a sectional end view taken along an arrow line X—X in (B). 
       FIG. 3  is a front elevational view for showing a state in which a portable equipment is engaged with and locked on the belt clip, where a configuration of the belt clip is indicated by a solid line and a configuration of the portable equipment is indicated by a broken line. 
       FIG. 4  is a sectional view (A) for showing a state in which an annular frame of a flange on the portable equipment presses against a claw of the belt clip to cause it to be retracted during a process for engaging the portable equipment with the belt clip; and a sectional view (B) for showing an engaged and locked state. 
       FIG. 5  is a front elevational view for showing a state in which the portable equipment is turned when the portable equipment is removed from the belt clip, where a configuration of the belt clip is indicated by a solid line and a configuration of the portable equipment is indicated by a broken line. 
       FIG. 6  is a front elevational view for showing a state in which the portable equipment is turned by 180° when the portable equipment is removed from the belt clip and the locked state is released, wherein a configuration of the belt clip is indicated by a solid line and a configuration of the portable equipment is indicated by a broken line. 
       FIG. 7  is a sectional view (A) for showing a state in which a portable equipment is turned when the portable equipment is removed from a belt clip; and a sectional view (B) for showing a state in which the portable equipment is turned by 180°, where these sectional views correspond to sectional views taken along an arrow line Y—Y in  FIGS. 5 and 6 , respectively. 
       FIG. 8  is a view for showing a mechanism on a portable equipment in accordance with a second preferred embodiment of the present invention, wherein (A) is a substantial front elevational view for showing a portable equipment; (B) is a sectional view taken along an arrow line Y—Y in (A); (C) is a sectional view taken along an arrow line X—X in (A); and (D) is a sectional end view taken along an arrow line Z—Z in (A). 
       FIG. 9  is a view for showing a mechanism at a belt clip in accordance with a second preferred embodiment of the present invention, wherein (A) is a left side elevational view for showing the belt clip; (B) is a front elevational view; (C) is a sectional view taken along an arrow line Y—Y in (B); and (D) is a sectional end view taken along an arrow line X—X in (B). 
       FIG. 10  is a view for showing a mechanism of a portable equipment in an engaging mechanism of the prior art (a system in which the portable equipment and the belt clip are kept independent from each other and a convenient protrusion arranged at the portable equipment is locked with the engaging part of the belt clip), where (A) is a substantial front elevational view for showing the portable equipment; (B) is a sectional view taken along an arrow line Y—Y in (A); and (C) is a sectional view taken along an arrow line X—X in (A). 
       FIG. 11  is a view for showing a mechanism of a belt clip corresponding to the mechanism of the portable equipment shown in  FIG. 10 , where (A) is a left side elevational view for showing the belt clip; (B) is a front elevational view; (C) is a sectional view taken along an arrow line Y—Y in (B); and (D) is a sectional end view taken along an arrow line X—X in (B). 
       FIG. 12  is a front elevational view for showing a state in which the portable equipment is engaged with the belt clip in the engaging mechanism of the prior art, where a configuration of the belt clip is indicated by a solid line and a configuration of the portable equipment is indicated by a broken line. 
       FIG. 13  is a front elevational view for showing a state in which the portable equipment is engaged with the belt clip at the engaging mechanism of the prior art, thereafter it is locked, where a configuration of the belt clip is indicated by a solid line and a configuration of the portable equipment is indicated by a broken line. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Referring now to  FIGS. 1 to 9 , the preferred embodiments of the engaging mechanism of the portable equipment against the belt clip of the invention will be described in detail. 
   Preferred Embodiment 1 
   The mechanism on the portable equipment in this preferred embodiment is shown in  FIG. 1 , wherein (A) is a substantial front elevational view for showing a portable equipment; (B) is a sectional view taken along an arrow line Y—Y in (A); (C) is a sectional view taken along an arrow line X—X in (A); and (D) is a sectional view taken along an arrow line Z—Z in (A). 
   In this figure, reference numeral  1  denotes an item of portable equipment (a transceiver, for example) and reference numeral  2  denotes a protrusion fixed with a screw to the rear surface of a casing in the portable equipment  1 . 
   As apparent from a comparison between  FIG. 1  and  FIG. 10 , although the protrusion  2  in this preferred embodiment is the same as that shown in  FIG. 10  in view of the fact that the protrusion is comprised of the base mount  3 , the cylindrical short column  4  and the flange  5 , the construction of the flange  5  is different from that shown in  FIG. 10 . 
   More practically, although the flange  5  is comprised of a disc  6  and an annular frame  7  formed at the circumferential edge of the disc  6 , discontinuous segment  108  as found in  FIG. 10  is not present at the annular frame  7  and it is formed as a continuous annular frame. 
   Then, a feature of this flange  5  consists in the fact that a protrusion  8  is formed under an embodiment in which it is protruded inwardly from the inner wall surface at the upper position of the annular frame  7 . 
   This protrusion  8  is made such that its upper surface  8   a  is continuous at the same height as that the end surface  7   a  of the annular frame  7  and both sides of the annular frame in the circumferential direction are formed as slant surfaces  8   b  and  8   c.    
   Accordingly, the sectional surface of the disc  6  in a circumferential direction near the protrusion  8  [refer to the sectional view taken along an arrow line Y—Y of  FIG. 1(A) ] becomes a protrusion having trapezoidal waveform shape as shown in  FIG. 1  (D). 
   In turn, the mechanism at the belt clip in the preferred embodiment is shown in  FIG. 2 , wherein (A) is a left side elevational view for showing the belt clip; (B) is a front elevational view; (C) is a sectional view taken along an arrow line Y—Y in (B); and (D) is a sectional end view taken along an arrow line X—X in (B). 
   In this figure, reference numeral  21  denotes a belt clip, reference numeral  22  denotes a clip, reference numeral  23  denotes an engaging plate for use in engaging with the aforesaid portable equipment  1 . As apparent from a comparison with  FIG. 1 , this basic configuration and a connecting mechanism between the clip  22  and the engaging plate  23  are the same as that shown in  FIG. 11 . 
   Accordingly, the mechanism elements shown in  FIG. 2  having the same configuration as that of the belt clip  201  shown in  FIG. 11  are denoted by the same reference symbols. 
   A feature of the belt clip  21  in this preferred embodiment consists in a shape of the claw  29  formed at the surface of the engaging plate  23  and the arrangement in which a U-shaped slit  30  is formed at the engaging plate  23 . 
   Practically, although the claw  209  in  FIG. 11  is made such that its side wall is perpendicular to the surface of the engaging plate  203 , the claw  29  in this preferred embodiment is formed such that the side wall of the upper side is applied as a slant surface  29   a , and a planar size formed by its width w′ and a length (b) is set to be included between the inwardly directed plane of the protrusion  8  of the flange  5  and the annular frame  7  shown in  FIG. 1(A) . 
   In addition, although the engaging plate  203  in  FIG. 11  is merely formed with a claw  209 , a U-shaped slit  30  in this preferred embodiment is formed under a state in which the installing region for the claw  29  is included inside and this slit  30  forms a cantilever beam  31  extending in a vertical direction and having the claw  9  arranged in the central region at the extremity end surface. 
   Both the clip  22  and the engaging plate  23  of the belt clip  21  are generally formed by synthetic resin, so that the cantilever beam  31  may act as a leaf spring in response to a shape of the slit  30  and a longitudinal modulus of elasticity of its raw material. 
   As shown in  FIG. 3 , when the flange  5  the portable equipment  1  is fitted into the engaging part  210  at the belt clip  21  in an upward or downward relation (the protrusion  8  of the flange  5  at the protrusion  2  is an upper side) of the construction of the protrusion  2  at the portable equipment  1  and the engaging plate  23  at the belt clip under a state in which the belt clip  21  is installed at the belt  220 , the flange  5  is guided to the lower side of the engaging part  210  while the short column  4  of the protrusion  2  is being guided by the recess  213  in the same manner as that shown in  FIG. 12 . 
   Then, under the fitting stage, there is provided a state in which the lower side of the annular frame  7  at the flange  5  is contacted with the claw  29  of the engaging plate  23  at the belt clip  21 . 
   However, the upper side wall of the claw  29  is constituted as a slant surface  29   a  as described above and further the claw  29  is formed in an extremity end region of the cantilever beam  31  constituted by the slit  30 , so that the end surface of the annular frame  7  at the flange  5  fitted as shown in  FIG. 4(A)  causes the cantilever beam  31  to be flexed while being slidingly contacted with the slant surface  29  of the claw  29 , and then the annular frame  7  rides over the upper surface of the claw  29 . 
   Further, when the flange  5  at the portable equipment  1  is guided to the lower side of the engaging part  210  and the short column  4  is engaged with the lower-most part of the recess  213  at the belt clip  21 , the annular frame  7  rides over the claw  29  and the cantilever beam  31  returns back to its original state by its resiliency as shown in  FIGS. 3 and 4(B) , resulting in that the claw  29  is fitted into the flange  5 . 
   That is, the claw  29  is fitted into a space constituted between the inward directed surface of the protrusion  8  at the flange  5  and the annular frame  7  and then the engaged state of the portable equipment  1  against the belt clip  21  is completed under this state. 
   Then, under the engaged state, the flange  5  can be moved only toward the upper part of the recess  213  and an engaged relation is created between the extremity end surface of the claw  29  and the annular frame  7  of the flange  5 , so that even if a vibration occurs at the belt clip  21 , the portable equipment  1  is not removed and a complete engaged and locked state is attained. 
   Then, in order to remove the portable equipment  1  kept under the engaged and locked state from the belt clip  21 , the portable equipment  1  is turned as shown in  FIG. 5  and it is pulled out upwardly under a state in which it is turned by 180° as shown in  FIG. 6 . 
   In addition, the sectional view under each of the states [the sectional views taken along an arrow line Y—Y in  FIGS. 5 and 6 ] is indicated by (A) and (B) in  FIG. 7 , respectively. 
   At first,  FIGS. 5 and 7(A)  illustrate the state in which the portable equipment  1  is turned by about 145°. The flange  5  is turned while the claw  29  at the belt clip  21  is stored in the annular frame  7 , and when the flange is turned by about 130° or more, the protrusion  8  at the flange  5  becomes a positional relation in which it is contacted with the side surface of the claw  29 . 
   In this case, since both side portions of the protrusion  8  in its circumferential direction are formed as slant surfaces  8   b  and  8   c , the claw  29  causes the cantilever beam  31  to be flexed while being slidingly contacted with the slant surface  8   c  from a circumferential direction as the flange  5  is rotated, and at the time when it is turned by 180°, the protrusion  8  causes the claw  29  to be pushed toward the clip  22  rather than toward the surface of the engaging plate  23  as shown in  FIGS. 6 and 7(B) , resulting in that the upper surface  8   a  of the protrusion  8  rides over the upper surface of the claw  29 . 
   That is, the protrusion  8  may act as a rotary cam against the claw  29 , and the claw  29  of the cantilever beam  31  is retracted as the flange  5  is turned. 
   Then, as described above, the upper surface  8   a  of the protrusion  8  is formed in continuous contact with the end surface  7   a  of the annular frame  7  at the same height. 
   Accordingly, under the state shown in  FIGS. 6 and 7(B) , the engaged relation between the claw  29  and the annular frame  7  at the flange  5  has already been released and when the portable equipment  1  is pulled up in an upward direction from this state, the flange  5  can be smoothly removed from the engaging part  210  at the belt clip  21  and the portable equipment  1  can be released from the engaged and locked state of the belt clip  21 . 
   With the foregoing, in accordance with the engaging mechanism of the preferred embodiment, it is merely satisfactory to perform fitting of the flange  5  into the engaging part  210  at the belt clip  21  under a state in which the portable equipment  1  is set upright in order to cause the portable equipment  1  to be engaged with the belt clip  21  and locked with it, resulting in that the portable equipment  1  is turned by 180° and pulled only when it is required to be removed. 
   With such an arrangement as above, an operation for engaging and locking the engaging mechanism becomes quite simple as compared with the fact that the portable equipment  101  must be turned by 180° when each of the fitting or removing operation is carried out as found in the prior art engaging mechanism shown in  FIGS. 10 to 13 . 
   Preferred Embodiment 2 
   The mechanism on the portable equipment in accordance with the preferred embodiment is shown in  FIG. 8 , wherein (A) is a substantial front elevational view for showing a portable equipment; (B) is a sectional view taken along an arrow line Y—Y in (A); (C) is a sectional view taken along an arrow line X—X in (A); and (D) is a sectional end view taken along an arrow line Z—Z in (A). 
   In addition, the mechanism on the belt clip is shown in  FIG. 9 , wherein (A) is a left side elevational view for showing the belt clip; (B) is a front elevational view; (C) is a sectional view taken along an arrow line Y—Y in (B); and (D) is a sectional end view taken along an arrow line X—X in (B). 
   Then, each of the figures corresponds to each of  FIG. 1  and  FIG. 2  in the preferred embodiment 1, wherein as apparent from the comparison, almost of all the mechanism elements are the same as those of the preferred embodiment 1. 
   Accordingly, in  FIGS. 8 and 9 , only the mechanism elements different from the portable equipment  1  in  FIG. 1  and the belt clip  21  in  FIG. 2  are denoted by affixing “′” to the reference symbols. 
   A feature in this preferred embodiment consists in the fact that the circumferential side surface of the protrusion  8 ′ formed at the flange  5  at the portable equipment  1  in  FIG. 8  is not applied as slant surfaces  8   b  and  8   c  as found in  FIG. 1 , but constituted as vertical surfaces  8   b ′ and  8   c ′ against the surface of the disc  6 , and the fact that the side wall of the claw  29 ′ formed at the cantilever beam  31  at the belt clip  21  in  FIG. 9  is not perpendicular to the surface of the engaging plate  203  as found in  FIG. 2 , but constituted as the slant surfaces  29   b ′ and  29   c′.    
   That is, although it is required that surfaces contacted to each other in respect to the circumferential direction become sliding pairs constituting the cam mechanism, their slant surfaces are reversed at the flange and at the claw. 
   Also in the case of this preferred embodiment, when the portable equipment  1  is engaged with and locked to the belt clip  21 , it is satisfactory to perform only fitting of the flange  5  to the engaging part  210  at the belt clip  21  under a state in which the portable equipment  1  is set upright in the same manner as that of the preferred embodiment 1, the cantilever beam  31  is flexed to cause the claw  29 ′ to be retracted while the lower side of the annular frame  7  at the flange  5  being slidingly contacted with the upper side slant surface  29   a ′ formed at the claw  29 ′ at the belt clip  21 , the entire claw  29 ′ is fitted inside the annular frame  7  under a state in which the short column  4  is engaged with the lower-most part of the recess  213  in the same state shown in  FIGS. 3 and 4(B)  in the preferred embodiment 1, and at this stage, it becomes an engaged and locked state. 
   In turn, also when the portable equipment  1  is removed from the belt clip  21 , the portable equipment  1  is also turned by 180° from the aforesaid state in the same manner as that of the preferred embodiment 1. 
   During the turning process, although the protrusion  8 ′ at the flange  5  of the portable equipment  1  is contacted with the claw  29 ′ at the belt clip  21  from its side, even if the side surfaces in the circumferential direction of the protrusion  8 ′ are vertical surfaces  8   b ′ and  8   c ′ as described above, the side walls of the claw  29 ′ are slant surfaces  29   b ′ and  29   c ′, so that the protrusion  8 ′ causes the cantilever beam  31  to be flexed and the claw  29 ′ to be pushed into it while being slidingly contacted with the slant surfaces  29   b ′ and  29   c ′ of the claw  29 ′, and retracted toward the clip  22  as the flange  5  is turned. 
   As a result, at the time when the portable equipment  1  is turned by 180°, the upper surface  8   a ′ of the protrusion  8 ′ at the flange  5  rides over the upper surface of the retracted claw  29 ′ and the lock mechanism is released under this state, so that pulling-up the portable equipment  1  as it is enables the flange  5  to be removed from the engaging part  210  at the belt clip  21 . 
   In other words, the shape of the protrusion  8 ′ and the shape of the claw  29 ′ are merely different from those of the former preferred embodiment and this preferred embodiment may also constitute the fitting or removing mechanism against the belt clip  21  of the portable equipment  1  under the same principle of function as that of the aforesaid preferred embodiment 1, and its fitting or removing operation is the same as that of the preferred embodiment 1. 
   The engaging mechanism of the portable equipment against the belt clip in accordance with the present invention has the aforesaid configuration and provides the following effects. 
   The engaging mechanism for use in engaging and locking an easy protrusion arranged at the portable equipment engaged with and locked against the engaging part at the belt clip is operated such that mere linear engaging operation causes the portable equipment to be locked with the belt clip without turning the portable equipment by 180° as found in the prior art and a mechanism having a sufficient state can be realized only by turning the portable equipment by 180° to be locked only when the portable equipment is removed from the belt clip and its fitting or removing operation is facilitated. 
   Accordingly, although the prior art frequently shows a case in which the lock is not engaged when it is forgotten to turn the portable equipment by 180°, the portable equipment drops by vibration or the like at the belt clip to cause some trouble or damage, such an unexpected state as above can be prevented in the present invention. 
   In addition, the present invention does not add a separate mechanism element as compared with the constitution of either the portable equipment or the belt clip and its rational function is realized by an easy configuration of mere partial improvement, resulting in that its manufacturing cost is scarcely changed. 
   Although the subject invention has been described in terms of the embodiments disclosed herein it is to be understood by those skilled in the art that the subject invention is not to be limited to the disclosed embodiments but is to be accorded the full breadth and scope of the appended claims.