CONSTRUCTION OF BATTERY COMPARTMENT

Abstract: Construction of battery compartment for a thin type device such as a memory card comprising a pair of inlet wall surfaces (1a) which are extended inwardly through one side wall of a main body (1) of the thin type device and which are inclined at a predetermined angle (ϑ) with respect to a normal to the outer surface of the side wall of the main body (1); a compartment surface (1c) whose both ends emerge with the pair of inlet wall surfaces (1a), respectively, and which has a shape for snuggling a battery (3) thereto; a cover body (2) which is inserted into the battery compartment space defined by the pair of wall surfaces and the compartment surface while holding a battery (3); and locking means for securely attaching the cover body (2) to the main body (1). The side surfaces of the cover body (2) are so inclined that they can match to the pair of inlet wall surfaces, respectively. Thus the cover body (2) can be inserted into or withdrawn out of the main body (1) only in the direction of inclination. As a result, the cover body (2) can be securely attached to the main body (1) and there is no fear that the cover body (2) is dropped out of the main body (1).

Description: The present invention relates to a construction of a battery compartment of a device which requires to have a battery replaced, comprising: a pair of inlet wall surfaces continuously formed with one side wall of a main body of said device; a compartment wall surface whose both ends merge with said pair of inlet wall surfaces and which has a shape for snuggling a battery thereto; a cover body which is inserted into the compartment space defined by said pair of wall surfaces and said compartment wall surface while holding said battery; and locking means for securely attaching said cover body to the main body of said device. Such a construction is known from DE-B-1 161 599. Memory cards, thin type radio sets and the like are in general very thin in thickness of the order of less than 3 mm. Therefore, in these thin card-type-devices, battery compartments having the constructions as shown in Fig. 1 and Fig. 2 have been generally used in order to make it easy to exchange a battery such as a coin-shaped litium battery CR2016 or the like. More particularly, in the case of the battery compartment as shown in Fig. 1, a battery insertion opening 1a is extended through one side wall of main body of a memory card or the like substantially perpendicular to the side wall. A cover 2 having a battery 3 clamped at the leading end thereof is inserted into the opening 1a and is securely attached to the main body 1 under the elastic forces of clicks 2a protruding outwardly from both sides of the cover 2. Therefore, when the cover 2 is drawn from the opening 1a and inserted again into the opening 1a of the main body 1, an old battery can be replaced with a new battery without use of any special device. In the case of the battery compartment of the type shown in Fig. 2, an opening 1b is formed through the upper or bottom wall 11 of a main body of a memory card or the like. A cover 2 which constitutes a part of the top or bottom wall is removed by loosening screw 4 to open the opening 1b to remove an old battery and then a new battery is inserted into the opening 1b. Thereafter, the opening 1b is closed by the cover 2 and the cover 2 is securely held in position by tightening the screw 4. However, in the case of the battery compartment of the type described above with reference to FIG. 1, the exchange of a discharged battery for a new battery is easy because no special tool or the like is needed to securely hold the cover 2 in position, but there is a problem that the cover 2 tends to be opened erroneously. In the case of a memory card, such an accident causes a fatal trouble because an electric power supply or the battery 3 is electrically disconnected from its associated electronic circuits or the like in the main body 1 so that the data stored in the memory card is lost. In addition, the cover 2 together with its click portions 2a is fabricated by molding plastic so that the elasticity of the clicks 2a becomes different from one cover to another because of the slight difference in shape or configuration between the covers so that the clicking forces of the clicks 2a become different from each other. Furthermore, there is a fear that the cover 2 is broken because of the decrease in mechanical strength due to aging. In case of the battery compartment as shown in FIG. 2, the opening 1b is formed through the upper or bottom wall of the memory card or the like and a discharged battery is replaced with a new one through this opening 1b so that the withdrawal and insertion of the batteries can be easily carried out. However, the design of the main body of the device is considerably limited because of a poor outer appearance of the cover 2. An object of the present invention is to provide a construction of a battery compartment in which a cover can be easily and securely held in position and a battery can be withdrawn or inserted through one side wall of a main body without degrading the outer appearance of the main body. According to the invention, the construction initially defined is characterized in that the inlet wall is inclined by a predetermined angle ϑ inwardly with respect to a normal to the outer surface of said one side wall of said device; and the cover body has side surfaces so inclined by said predetermined angle 0 as to make intimate contact with said pair of inlet wall surfaces, respectively. In the accompanying drawings: Fig. 1 is a fragmentary sectional view of a memory card illustrating a conventional battery compartment construction where a battery can be withdrawn or inserted through one side wall of the main body; Fig. 2 is a fragmentary bottom view of a memory card illustrating a conventional battery compartment construction where a battery can be inserted or withdrawn through the bottom wall of the main body; Figs. 3 to 5 are fragmentary sectional views, respectively, of a memory card having a battery compartment in accordance with the present invention, wherein: Fig. 3 is an exploded sectional view illustrating the construction of a battery compartment prior to the insertion of a cover body; Fig. 4 is a fragmentary sectional view illustrating the cover body securely attached to the memory card; and Fig. 5 is a longitudinal sectional view illustrating the battery compartment after the cover body is securely attached to the memory card; and FIG. 6 is a fragmentary sectional view of a memory card illustrating another embodiment of a construction of a battery compartment closed with a cover body. DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIGS. 3 to 5, a first preferred embodiment of the present invention will be described. Even though the first embodiment will be described in detail in conjunction with a memory card, it is to be understood that the present invention may be equally applied to any device or equipment such as a thin type radio, a desk-top computer, a clock, a wrist watch and so on in which it is required to replace a discharged battery with a new one. A pair of inlet wall surfaces 1a are continuously formed with one side wall of the main body 1 of the memory card in such a way that they are inclined at an angle ϑ (15° in the first embodiment) with respect to a normal to the surface of the one side wall of the main body 1 and are in opposing and parallel relationship with each other. A locking member 5 which is embedded in one of the pair of inlet walls 1a is extended upright. A cover body 2, which can be detachably inserted between the pair of inlet walls 1a so as to place a battery 3 in contact with a compartment wall 1c of the main body 1, has the side surfaces inclined at the same angle ϑ. Therefore, when the cover body 2 is pushed or pulled in the direction inclined by the angle ϑ with respect to a normal to the outer surface of the one side wall of the main body 1, it can be inserted into or withdrawn out of the main body 1, but when the cover body 2 is pushed or pulled in any other direction, it cannot be inserted or withdrawn. The cover body 2 is molded together with a thin metal plate 6 and when the coin-shaped lithium battery 3 is attached to the undersurface of the thin plate 6 which also serves as a guide and when the cover body 2 is inserted between the pair of inlet walls 1a, the battery 3 can be securely placed in a predetermined position. In addition, the inserted battery 3 is clamped between the thin plate 6 and an first electrode 7 of the main body and also makes a contact with an inner second electrode 10 so that the battery 3 supplies the electric energy to the circuits within the main body 1. In the first embodiment described above, the thin plate 6 has a function of guiding the battery 3, but has not been used as an electrode. However, it may be used as an electrode. A tap screw 8, for instance 1.4 mm in diameter, is inserted into a screw through-hole of the cover body and is threadably engaged with a screw hole, for instance 1.2 mm in diameter, formed in the locking member 5, whereby the cover body 2 can be securely attached to the main body 1. As described above, the inlet side walls 1a and the side surfaces of the cover body 2 are inclined at the same angle ϑ so that there is no fear that the cover body 2 is pulled out of the main body 1 in the direction perpendicular to the outer surface of the one side wall thereof. As a result, the cover body 2 can be securely attached to the main body 1 by jointing between them only at one position. It is to be understood that the present invention is not limited to the tap screw 8 and that instead a conventional pin can be used while the locking member 5 has a tapped hole. Referring next to FIG. 6, a second preferred embodiment of the present invention will be described. In the second embodiment, a pin 9 is slidably fitted into the main body 1 so that the upper end portion thereof can be fitted into a recess formed in one of the side surfaces of the cover body 2 when the cover body 2 is attached to the main body 1, whereby the cover body 2 can securely held in position within the main body 1. In the case of the second preferred embodiment with the above-described construction, the cover body 2 can be securely attached to the main body 1 only by sliding the pin 9, but in one modification of the present invention, the cover body 2 may be provided with clicks so that the cover body 2 can be securely held in position in the main body 2 under the elastic forces of such clicks. In this case, the cover body 2 can be attached to the main body 1 by one step. As described above, the battery compartments need not to have moving members such as springs by clicks so that the battery compartment constructions are very rigid from the standpoint of the structure. Furthermore, the cover body can be securely attached to the main body and it can be prevented from being detached from the main body. Furthermore, according to the present invention, the cover body is inserted into or withdrawn out of the main body of, for instance, the memory card through one of its side walls so that the outer appearance is not odd and that the construction of the battery compartment is not adversely affected from the standpoint of the design.

Claims: A construction of a battery compartment of a device which requires to have a battery replaced, comprising: a pair of inlet wall surfaces (1a) continuously formed with one side wall of a main body (1) of said device; a compartment wall surface (1c) whose both ends merge with said pair of inlet wall surfaces (1a) and which has a shape for snuggling a battery (3) thereto; a cover body which is inserted into the compartment space defined by said pair of wall surfaces and said compartment wall surface (1c) while holding said battery (3); and locking means (5,8,9) for securely attaching said cover body (2) to the main body (1) of said device; characterized in that: the inlet wall is inclined by a predetermined angle ϑ inwardly with respect to a normal to the outer surface of said one side wall of said device; and the cover body (2) has side surfaces so inclined by said predetermined angle ϑ as to make intimate contact with said pair of inlet wall surfaces (1a), respectively. A construction of a battery compartment as claimed in claim 1, wherein said cover body (2) has a thin plate (6) for supporting said battery (3) thereon. A construction of a battery compartment as claimed in claim 2, wherein an electrode (7) to make an electrical contact with said battery (3) is disposed in a compartment space defined by said compartment wall surface (1c) and said battery (3) is clamped between said electrode (7) and said thin plate (6). A construction of a battery compartment as claimed in claim 2, wherein said thin plate (6) is used as an electrode for establishing an electrical contact therebetween. A construction of a battery compartment as claimed in claim 1, wherein said locking means comprises a locking member (5) securely attached to said main body (1) of said device and a screw (8) for threadable engagement with a screw hole in said locking member (5), whereby said cover body (2) can be securely attached to the main body of said device. A construction of a battery compartment as claimed in claim 1, wherein said locking means comprises a pin (9) which is slidably fitted in said main body (1) of said device and comprises a recess which is formed in said cover body (2) and into which is fitted the leading end portion of said pin (9). A battery-operated device comprising a battery compartment construction according to any preceding claim. A device according to claim 7 which is a memory card.

Inventors: SATO, TAKAO
Applicants: KABUSHIKI KAISHA TOSHIBA
Application year: 1987
Main classification: H05K5
IPC codes: H05K5, H01M2