JPH0644018Y2 - Battery terminal structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention mainly relates to a battery terminal structure incorporated in a portable small electric device.

<Prior Art and Its Problems> Conventionally, a dry battery called AA is often used as a power source for a portable small electric device such as a portable electrocardiograph. As a battery terminal structure for electrically and mechanically connecting, a plate spring (not shown) or a conical compression coil spring 10 as shown in FIG. 4 is generally used. Has been done. However, in the battery terminal structure configured by using the leaf spring, there are restrictions on the dimensional variation of the battery and the setting of the contact pressure, and the elastic force of the leaf spring decreases every time the battery is repeatedly attached and detached. It was difficult to maintain good contact with the battery.

On the other hand, the battery terminal structure using the compression coil spring 10 has an advantage that it is easy to deal with the dimensional variation of the battery and the setting of the contact pressure. However, in this compression coil spring 10, the inner end that contacts the battery, that is,
The inner end 10a, which has been made smaller in diameter by bending, has lost its elastic force due to plastic deformation associated with working, and its outer end 10b
Since the contact force with the battery is maintained by the elastic force of the chisel, if an impact force is applied when dropping or vibrating the electric device or replacing the battery, the contact pressure is further deformed and the contact pressure is increased. As a result, there is a disadvantage that satisfactory durability and reliability cannot be obtained.

Furthermore, in any of the battery terminal structures, since the positive and negative terminals of the battery can be attached and detached while being in the opposite direction, it was not possible to prevent the incorrect installation.

The present invention was devised in view of such a situation as described above, and it is possible to maintain good contact with a battery and to have excellent durability and reliability. The object is to provide a battery terminal structure that can be prevented.

<Means for Solving the Problems> In order to achieve such an object, the present invention has a cylindrical compression coil spring in which a contact member for contacting a positive terminal protruding from a battery is attached to an inner end portion. And an insulating member that covers the outer periphery of the inner end portion thereof, and the inner end portion of the insulating member is formed to project shorter than the projecting length of the positive terminal, and the contact member and the battery It is characterized in that a contact preventing claw for separating the negative terminal is formed.

<Operation> According to the above configuration, the inner end portion of the cylindrical compression coil spring is not plastically deformed by the small-diameter bending process that is necessary for the conical compression coil spring, The compression coil spring holds an effective elastic force over its entire length. Therefore, not only is it easier to deal with dimensional variations of the batteries and setting of the contact pressure, but also the elastic force does not decrease even if the batteries are repeatedly attached and detached. Further, since the contact preventing claw is formed on the insulating member covering the inner end portion of the compression coil spring in a protruding manner, the positive terminal formed on the protruding portion of the battery can contact the contact member, but the negative terminal of the battery is not contacted. The terminal and the contact member are separated from each other by the contact prevention claw, and the contact is prevented.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing an assembled state of a single main part of a battery terminal structure according to the present invention, FIG. 2 is an exploded perspective view showing the entire structure thereof, and FIG. It is sectional drawing which shows the state attached to FIG.

The battery terminal structure according to the present embodiment includes a compression coil spring 1 having a cylindrical shape, and an inner end portion 1a thereof has a disc-like shape which is brought into contact with a positive terminal 2a formed so as to project from a battery 2 to conduct electricity. The contact member 3 is attached. That is, the inner end portion 1a of the compression coil spring 1 is not subjected to the small-diameter bending process that is necessary in the conical compression coil spring 10 according to the conventional example, and is not plastically deformed. Therefore, this compression coil spring 1 holds an effective elastic force over its entire length.

An insulating member 4 that covers the outer periphery of the compression coil spring 1 is fitted on the inner end 1a of the compression coil spring 1.
Is formed as a cap made of an insulating resin material or the like. A contact prevention claw 5 having a length slightly shorter than the protruding length of the positive terminal 2a of the battery 2 is formed so as to protrude from the facing position at the inner end of the insulating member 4. The contact prevention claw 5 is formed so as to project. The formation position and the number of the contact prevention claws 5 are selected as needed.

Further, this battery terminal structure is provided with the number of sets corresponding to the number of batteries 2 required for electric equipment, for example, only four sets are prepared as shown in FIG. 2, and the outer end of each compression coil spring 1 is prepared. It is attached to the terminal receiving cabinet 6 via the portion 1b. And this terminal receiving cabinet 6
The insulating member 4 covering the inner end portion 1a of the compression coil spring 1 attached to the above is slidably positioned and supported by the terminal guide plate 7 in which the through hole 7a for positioning and supporting these is formed. As shown in, it is attached to the battery compartment of the device body. Therefore, when the battery 2 is mounted in the battery housing portion, if the positive terminal 2a protruding from the battery 2 is oriented in the correct direction, the positive terminal 2a is located at the inner end portion of the compression coil spring 1.
It comes into contact with the contact member 3 attached to 1a. However, at this time, when the orientation of the positive terminal 2a of the mounted battery 2 is incorrect, the negative terminal 2b of the battery 2 and the contact member 3 are formed on the inner end of the insulating member 4 so as to prevent contact. The claws 5 separate them from each other, and the contact between them is blocked.

<Effect of the Invention> As described above, according to the battery terminal structure of the present invention, the inner end of the cylindrical compression coil spring is not plastically deformed, and an effective elastic force is retained over its entire length. Therefore, not only it is easy to cope with the dimensional variation of the battery and the setting of the contact pressure, but also the elastic force of the compression coil spring does not decrease even if the battery is repeatedly attached and detached. As a result, it is possible to maintain good contact with the battery, and it is possible to greatly improve the durability and reliability of the battery.

Also, the insulating member covering the inner end of the compression coil spring is provided with a contact preventing claw protruding from the positive terminal of the battery which is shorter than the protruding length of the positive terminal of the battery. The claws will separate them from each other and prevent their contact. Therefore, it is possible to obtain the effect that the erroneous mounting of the battery can be reliably prevented.

[Brief description of drawings]

1 to 3 relate to an embodiment of the present invention, and FIG. 1 is an external perspective view showing an assembled state of a single main part of a battery terminal structure,
FIG. 2 is an exploded perspective view showing the entire structure, and FIG. 3 is a sectional view showing a state in which the battery terminal structure is attached to the device body. FIG. 4 is an external perspective view showing a conical compression coil spring used when constructing the battery terminal structure of the conventional example. In these drawings, reference numeral 1 is a compression coil spring, 1a is an inner end portion thereof, 2 is a battery, 2a is a positive terminal, 3 is a contact member, 4 is an insulating member, and 5 is a contact prevention claw.

Claims (1)

[Scope of utility model registration request] 1. A cylindrical compression coil spring having a contact member for contacting a positive terminal formed to project from a battery attached to an inner end portion, and an insulating member for covering an outer periphery of the inner end portion, The battery is characterized in that an inner end portion of this insulating member is formed with a contact preventing claw that protrudes shorter than the protruding length of the positive terminal and that separates the contact member from the negative terminal of the battery. Terminal structure.