Foldable portable wireless telephone apparatus

Abstract: A folding portable wireless apparatus of the invention is provided with locking mechanisms provided on the both side faces of an upper and a lower case which are so configured as to be capable of opening and closing. The locking mechanisms have open levers which are provided on the both side faces of either the upper or the lower case and can be manually operated. To the both side faces of the other case are provided engaging portions which interlock with the open levers to lock the both cases, and locking impetus giving members for giving an impetus to the open levers are also provided in such a direction that the locked state established between the open levers and the engaging portions is maintained. In this structure, since the opening operation is carried out by both a thumb and an index fingers of a hand holding the portable wireless apparatus, the easy and rapid opening operation is possible no matter which hand may being holding the wireless apparatus.

Description: BACKGROUND OF THE INVENTION Field of the Invention: The present invention relates to a portable wireless apparatus such as a folding portable telephone, and more particularly to a portable wireless apparatus with an automatically opening case. Description of the Related Art: A portable wireless apparatus is provided with a receiver, a transmitter, a key operation portion composed of various keys and a display for displaying time and various information at surface portion of a case accommodating a wireless unit therein. Since the receiver and the transmitter must be located in correspondence with an ear and a mouth of a user in its use in this type of portable wireless telephone, the distance between the receiver and the transmitter secured in accordance with the distance between the human ear and mouth results in the entirely-large size of the apparatus, compromising portability. There is thus provided a folding portable wireless apparatus. The receiver and the display portion are provided in an upper case while the transmitter and the key operation portion are disposed in a lower case, and these upper and lower cases are joined through a hinge portion so as to be opened and/or closed. The distance between the receiver and the transmitter can be set to a predetermined dimension by folding the cases to realize a compact size when carried and by opening the enclosed bodies for use. This type of folding portable wireless apparatus, however, requires in an operation that one case (the lower case) is held by one hand while the other case (the upper case) is opened by the other hand, and hence the operation using the both hands may be troublesome for the user. In recent years, therefore, a portable wireless apparatus which is opened and closed by the operation using a button has been proposed. For example, in a wireless apparatus disclosed in Japanese patent laid-open publication No. Showa 63-86929, the opening/closing mechanism of the folding case is released by pushing a button provided on one side of the case of the wireless apparatus which can be folded, and the case is opened by an elastic force of a spring. Further, in a portable telephone disclosed in Japanese patent laid-open publication No. Heisei 4-307841, the cover is opened in a one-touch manner with an action of a spring by releasing a hook interlocked with a call button. In these conventional opening/closing structures, however, a case is designed to be opened by pushing a button provided on one side of the case in the portable wireless apparatus. In general, the portable wireless apparatus is often designed on the assumption that the pushing operation would be carried out by a thumb of a user. When the portable wireless apparatus is held by one hand, it is therefore difficult to operate the button by using a thumb and in some cases the rapid opening operation may be impossible. In addition, the button is so configured as to be pushed against one side of the case. Since the case is pressed against the other side when pushed, the case must be securely held by a hand for receiving the pushing force, requiring a large force from the hand during the pushing operation. In such a case, the increase in the force for pushing the button involves an increase in the operation force at the time of the pushing open the case, and a finger-tip may hurt at the time of operation. On the contrary, if the operation force is decreased, the case may be opened by erroneously touching the button when holding the portable wireless apparatus, which may lead to a possibility such that the portable wireless apparatus would be dropped if the user is thereby startled. In particular, since the button is often provided so as to protrude from the surface of the case of the portable wireless apparatus, the button is often accidentally touched and pushed when handling the apparatus. In the above-described patent laid-open publications, since the structure showing the relationship between the button and the engaging/undoing mechanism is not concretely explained, it is not apparent how the engaging/undoing mechanism is actually released by pushing the button, and the disclosure of these publications cannot be directly utilized. French Patent FR-A-2 461 431 describes a radio-microphone in a container having a removable cover attached by a snap-fit mechanism. The cover may be removed from the container by elastically flexing a pair of arms extending on the sides of the cover, the flexing releasing lock ends on the arms from mating recesses on the container. SUMMARY OF THE INVENTION In view of the above-described drawbacks, it is therefore an object of at least the preferred embodiments of the present invention to provide a folding wireless apparatus with improved operability such that the case when closed can be opened in one-touch manner. Further, it is another object of those embodiments to provide a folding portable wireless apparatus having a structure for affecting the opening of the case in one-touch manner. To this end, according to one aspect of the present invention, there is provided a folding portable wireless apparatus, in which an upper case and a lower case are connected by a hinge to enable opening and/or closing of said cases. The apparatus comprises: opening biasing means for biasing the upper case and the lower case in an opening direction; and, locking means provided to both side faces of the upper case and the lower case. The locking means includes: structures provided on both side faces of one of the upper case and the lower case; engaging portions provided on both side faces of the other one of the upper case and the lower case for engaging with the structures to lock closed the upper and lower cases; and, locking biasing means for biasing the structures into engagement with the engaging portions. The structures have parts manually movable towards each other against the locking biasing means to disengage from the engaging portions and unlock the cases. Preferably, each structure of the locking means is a lever. The levers may be exposed so as to be directly accessible for manual operation. Preferably the levers are of the type in which the load and the effort are on opposite sides of the fulcrum. In this embodiment, the levers are provided to both side faces of one case so as to be capable of oscillation. A hook or a locking groove is formed on one end of each of the levers, and the engaging portions are provided on both side faces of the other case and constituted by locking grooves or hooks with which the hooks or locking grooves respectively engage. In addition, it is preferable that: the levers can oscillate in a direction of the thickness of one case; one end of each lever-protrudes from the front face of the case; a hook or a locking groove is formed on the inner face of the one end of each lever; and, the locking biasing means gives an inward impetus to the one end of each lever. Further, it is preferable that the levers are mounted in shallow concave portions provided on both sides of one case, and the surface of each lever is located on the same plane level with the side face of the case. According to the present invention, since the opening operation is carried out using a thumb and an index finger of a hand holding the portable wireless apparatus, an easy and rapid opening operation is possible, no matter which hand holds the wireless apparatus. Further, since the locked state is released in such manner than the levers are pinched from both sides, the force against one side of the case does not act during the operation, thus requiring no large force at the time of operation. In addition, the levers are operated by their oscillation, and the operating force can be reduced by the lever ratio in the levers regardless of the engaging force between the levers and the engaging portions. Furthermore, since the levers are mounted in the shallow concave portions provided on both sides of one case and the surface of each lever is positioned on the same plane level as the side face of the case, it is possible to prevent releasing of the locked state which is caused by unwillingly touching the levers during the handling of the portable wireless apparatus. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become apparent from the following detailed description when taken with the accompanying drawings in which: Figs. 1 and 2 are perspective views showing the states where a portable wireless apparatus of the invention is folded and opened, respectively; Figs. 3 and 4 are a front view and a side view showing the state where the portable wireless apparatus of the invention is opened; Fig. 5 is a partially exploded perspective view showing an open lever; and Figs. 6 and 7 are sectional views showing the states where an upper case is opened and folded, respectively. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Fig. 1 is a perspective view showing the state where an embodiment of a portable telephone to which the present invention is applied is folded, and Fig. 2 is a perspective view showing the state where the embodiment is opened. Figs. 3 and 4 are a front view and a side view showing the embodiment being opened. In these drawings, a body 1 is constituted by an upper case 11 and a lower case 12, and the upper and lower cases are connected to each other through a hinge portion 13 in a rotational direction. A receiver 14 and a display portion 15 are provided to the front face of the upper case 11. Further, a transmitter 16 and a key operation portion 17 are disposed to the lower case 12. In the hinge portion 13, as shown in Figs. 3 and 4, a shaft 131 made of a fine rod pierces the upper and lower cases 11 and 12, and torsion springs 132 are wound around this shaft 131. The torsion springs 132 give an impetus in such a manner that the elastic force acts on the upper enclosed body 11 in the upward direction as seen from the lower case 12, namely, in such a direction that the upper case 11 opens. The outer shape of the upper case 11 and the front shape of the lower case 12 have the same surface shape so that the upper case 11 is accommodated along the surface of the lower case 12 when the upper case 11 rotates around the hinge portion 13 toward the lower case 11. Shallow concave grooves 111 (Fig. 2) are formed to the both side faces of the upper case 11 in the vicinity of the hinge portion 13, and a rectangular locking groove 112 is formed to a part of a side face of each shallow concave groove 111. Referring to Figs. 5 to 7, shallow concave portions 121 (Fig. 7) each having a relatively-large dimension are formed on the both side faces of the lower case 12 in the vicinity of the hinge portion 13, and a plate type open lever 122 is provided to each shallow concave portion 121 in such a manner that a front end of the lever 122 slightly protrudes from the front face of the lower case 12. In the respective concave portions 121, a pair of open levers 122 are supported to the lower case 12 through fixed shafts 123 extending in the longitudinal direction of the lower case 12 and, as shown in Fig. 6, they are so supported as to be capable of oscillation in directions indicated by arrow heads B1 and B2. In addition, coil springs 124 are wound around the fixed shafts 123, and the coil springs 124 give an impetus to the open levers 122 so that the spring force acts in the direction indicated by the arrow head B1, namely, in such a direction that the respective front ends of a pair of open levers 122 move closer to each other. Hooks 125 each having a tapered cross section are integrally formed to the inner surfaces of the front tips of the open levers 122, and the hooks 125 can engage with locking grooves 112 provided on the both side faces of the upper case 11. According to this structure, when the upper case 11 is folded with respect to the lower case 12 as shown in Fig. 1, the front ends of the open levers 122 move into the shallow concave grooves 111 provided on the both sides of the upper case 11 as shown in Fig. 6, and the hooks 125 of the open levers 122 simultaneously engage with the locking grooves 112 of the upper case 11. At this time, since an impetus is given to the hooks 125 of the open levers 122 to move toward the locking grooves 112 by the elastic force of the coil springs 124, the engaged state established between the hooks 125 and the locking grooves 122 can be maintained by the elastic force of the coil springs 124. When rear ends of the respective open levers 122 are pushed like in a pinching manner and the open levers 122 are oscillated against an impetus of the coil springs 124 in a direction indicated by an arrow head B2 in Fig. 3, the engagement attained between the hooks 125 and the locking grooves 112 are released. The upper case 11 thus swivels upwardly by an impetus of the torsion springs 132 of the hinge portion 13 to be opened from the lower case 12 as shown in Fig. 6. In order to again obtain the closed state of the upper case 11, the upper case 11 may swivel against an impetus of the torsion springs 132 to be closed with respect to the lower case 12. The both side faces of the upper case 11 then move over the hooks 125 of the open levers 122, and the locking grooves 112 are again engaged with the hooks 125. Accordingly, the state shown in Fig. 7 is obtained, and hence the upper case 11 is again locked, thereby being closed. In this way, in the portable telephone according to this embodiment, when the open levers 122 provided on the both side faces of the lower case 12 are operated, the locked state achieved between the upper case 11 and the lower enclosed body 12 can be released, thus opening the upper case 11. In such a case, since the open levers 122 can be operated by pinching the levers 122 on the both sides by using a thumb and an index finger of a hand actually holding the portable telephone, the opening operation is facilitated, no matter which hand may be holding the portable telephone. Further, in case of operating the open levers 122, since the longitudinal length of each open lever 122 is as large as the thickness of the lower case 12, the open levers 122 can be operated with a small force by a lever ratio of the open levers 122 even if the spring force of the coil springs 124 is increased to strengthen the engaging force between the hooks 125 and the locking grooves 112, thus enabling the easy opening operation. Meanwhile, since the locked state is not released until the rear ends of the open levers 122 are pinched, the locked state can not be released by only touching the front ends of the open levers 122. It is therefore possible to prevent the upper case 11 from being unwillingly opened. Further, in this case, even when one of the two open levers 122 provided on the both side of the lower case 12 is erroneously touched or when it is pushed, the locked state is still maintained by the other open lever 122, thus preventing the upper case 11 from being opened. In particular, since the open levers 122 are provided in the shallow concave portions 121 formed to the lower case 12, the surfaces of the open levers 122 can be located on the same surface level with the surface of the lower case 12. Therefore, the open levers 122 can not exist as projections in the portable wireless apparatus, and the portability of the portable wireless apparatus can not be deteriorated, thereby preventing the open levers from being operated unwillingly when handling the portable wireless apparatus. Although the open levers are provided to the lower case and the case is opened and/or closed by swiveling the upper case, the open levers may be provided to the upper case and the lower case may swivel to open and/or close the case. In addition, the locking grooves may be formed on the open lever sides, and the hooks may be formed on the side faces of the opposed enclosed body. While this invention has been described with reference to an illustrative embodiment, this description is not intended to be construed in a limiting sense. Various modifications of the illustrative embodiments, as well as other embodiments of the invention, will be apparent to persons skilled in the art upon reference to this description. It is, therefore, contemplated that the appended claims will cover any such modifications or embodiments as fall within the scope of the invention as set out in the appended claims.

Claims: A folding portable wireless apparatus, in which an upper case (11) and a lower case (12) are connected by a hinge (13) to enable opening and/or closing of said cases, comprising: opening biasing means (132) for biasing said upper case and said lower case in an opening direction; and, locking means provided to both side faces of said upper case and said lower case, said locking means including: structures (122) provided on both side faces of one of said upper case and said lower case; engaging portions (112, 125) provided on both side faces of the other one of said upper case and said lower case for engaging with said structures to lock closed said upper and lower cases; and, locking biasing means (124) for biasing said structures into engagement with the engaging portions; wherein said structures have parts manually movable towards each other against said locking biasing means to disengage from-said engaging portions and unlock the cases. A folding portable wireless apparatus as in claim 1, wherein each structure of the locking means is a lever (122). A folding portable wireless apparatus as in claim 2, wherein said levers (122) are so provided to both side faces of one case so as to be capable of oscillation, wherein a hook (125) or a locking groove (112) is formed on one end of each of said levers, and wherein said engaging portions (112, 125) are provided on both side faces of the other case and constituted by locking grooves (112) or hooks (125) with which said hooks or said locking grooves respectively engage. A folding portable wireless apparatus as in claim 3, wherein said levers (122) are able to oscillate in a direction of the thickness of one case, wherein one end of each of said levers protrudes from the front face of the case, and wherein a hook (125) or a locking groove (112) is formed on the inner face of said one end, and wherein said locking biasing means (124) gives an inward impetus to said one end. A folding portable wireless apparatus as in claim 2, wherein said levers are mounted in shallow concave portions provided on both.side faces of one case, and wherein the surfaces of said levers are located on the same surface level with the side face of the case.

Inventors: NAGAI MICHIO, NAGAI, MICHIO, NAGAI, MICHIO, C/O NEC CORPORATION
Applicants: NIPPON ELECTRIC CO, NEC CORPORATION
Application year: 1995
Main classification: H04M1
IPC codes: H04Q7, H04M1, H05K5