JPS5818217Y2 - Battery-powered equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device using a battery such as an electric shaver, and more particularly to the structure of the bottom of a battery storage case thereof.

As an example of conventional battery-powered devices, electric shavers are the first
As shown in the figure.

This electric shaver includes a head case 1 and a battery storage case 2.

The head case 1 has an outer cutter 3 at its upper end, and a built-in motor 4 for rotating an inner cutter (not shown).

The battery storage case 2 is composed of a cylindrical case body 5 and a bottom cover 6 fitted into the bottom of the case body 5, and a battery 7 is housed inside.

The battery 7 is supported by a spiral truncated conical contact spring 8 installed on the top surface of the bottom cover 6.

The anode of the battery 7 contacts the positive terminal of the motor 4 due to the repulsive force of the contact spring 8, and the cathode connects to the motor 4 via the contact spring 8 and a cylindrical spring 9 formed in a spiral shape by a series of wires. Conductive to the negative terminal of.

The drive of the motor 4 is stopped by switching the switch 10.

The battery storage case 2 is composed of a cylindrical case body 5 and a bottom lid 6 because the case body 5 is manufactured by cutting a metal tube and the bottom lid 6 is manufactured by molding a plastic. This is aimed at reducing overall costs.

As shown in FIGS. 2 and 3, the bottom cover 6 has a bottom plate 11.
A cylindrical wall 12 and a cross-shaped reinforcing ridge 13 are integrally formed on the top, and two bottom plates 1 are installed at symmetrical positions on the cylindrical wall 12.
A notch 14 reaching 1 is formed, and a stopper 16 having an outwardly protruding pawl 15 at the upper end is provided between the notches 14.

When the bottom cover 6 is fitted into the bottom of the case body 5, the claws 15 dig into the grooves 17 formed on the circumferential surface near the bottom of the case body 5, making it impossible to remove it.

To put in and take out the battery 7, use the head case 1 and battery storage case 2.
and are screwed together with screws 18, so remove this part before doing this.

In a conventional electric shaver configured in this way, if you drop it on the floor due to carelessness, etc., the battery 1 will fall into the storage case 2 at the moment it hits the floor because the battery is heavy.
If the claw 15 moves inside and collides with the bottom cover 6, the impact may break the claw 15, or it may come off the groove 11 and the bottom cover 6 may come off.
Alternatively, there were problems such as cracks in the bottom cover 6 itself.

In the past, when the contact spring 8 was flat on the bottom cover 6, a shock absorbing effect was exerted against a drop impact, but this level of shock absorbing effect was insufficient.

This kind of problem occurs not only in the electric shaver shown in the figure, but also in those with a structure in which the bottom cover is screwed into the case body, or in those in which the bottom cover and the case body are integrally formed. This problem occurs not only with electric shavers but also with other battery-powered devices.

An object of the present invention is to provide a battery-powered device that can withstand dropping impact while eliminating the drawbacks of the above-mentioned conventional techniques.

In order to achieve this object, the present invention is characterized in that a space is provided at the bottom of the battery storage case to allow the contact spring to deform toward the bottom, thereby increasing the amount of deformation of the contact spring.

A first embodiment of the present invention will be described below with reference to an electric shaver shown in FIGS. 4 and 5.

4 and 5, the same reference numerals as in FIGS. 1 to 3 indicate the same or equivalent parts.

Also, since the structure of the head case is the same as in Figure 1,
It is omitted in the figure.

These matters also apply to FIGS. 6 to 9, which will be explained later.

The bottom cover 6 is fitted into the case body 5 to form the battery storage case 2.
is constructed, and the battery 7 is supported within this storage case 2 via a contact spring 8 installed on the bottom cover 6.
Although it is similar to the conventional example shown in FIG.
As a result, a space 19 is formed closer to the bottom than the installation position of the contact spring 8 at the upper end of the cylindrical wall 12.

This space is designed to protect the electric shaver from falling impact.
As shown in FIG. 6, the contact spring 8 is allowed to be deformed from the installation position toward the bottom side due to the movement of the battery 7.

(1) Considering the magnitude of the impact force F exerted by the battery 7 on the bottom cover 6 when the electric shaver receives a fall impact, it is as follows.

v ”” At where m: Mass of the battery V: Speed Jt: Time difference in 1 from when the battery starts to move due to impact until it stops, and there is a space 19 on the bottom side from the installation position of the contact spring 8.
By providing Jt in the above formula, it is possible to increase Jt, so even if the elasticity of the contact spring 8 is the same, the impact force F applied to the bottom cover 6 is reduced by circular knitting.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, the bottom cover 6 is attached to the case body 5 with screws 20, and a space 19 is formed on the bottom side from the contact spring installation position at the upper end of the bottom cover 6.
A resilient plastic foam 21 is placed inside.

Therefore, when the contact spring 8 is deformed toward the bottom side from the installation position due to a drop impact, the plastic foam 21 is compressed, so that the cushioning effect is further improved.

Further, a third embodiment of the present invention will be described with reference to FIGS. 8 and 9.

In this embodiment, a leaf spring as shown in FIG. 9 is used as the contact spring 8.

In other words, the contact spring 8 causes the stain pond 1 to be removed from the middle part of the leaf spring raised diagonally upward from the installation part 22 installed at the upper end of the bottom cover 6, and then to the tongue part 23 which is further pulled out in the opposite direction and raised. It was designed to be supported.

This contact spring 8 is integral with an annular contact piece 25 whose rising edge contacts the negative terminal of the motor via a nine piece 24.

Therefore, when a fall impact is applied, the contact spring 8
As shown by the chain line in the figure, it deforms toward the bottom side from the installation position and enters the space 19, so that the impact caused by the battery 7 can be alleviated.

Nato.

Although the above embodiments have been described with reference to the case where the present invention is applied to an electric shaver, the present invention is not limited thereto, and can be widely applied to other battery-powered devices.

As explained above, according to the present invention, since a space is provided on the bottom side of the installation position of the contact spring, the amount of deformation of the contact spring when receiving a drop impact can be increased, and the impact caused by the battery can be increased. This can prevent the battery storage case from falling out or being damaged.

[Brief explanation of the drawing]

Figure 1 is a broken diagram of the main parts of a conventional electric shaver.
Figures 2 and 3 are lines A-A and B- of Figure 1, respectively.
4 is a partially cutaway vertical sectional view of the electric shaver showing the first embodiment of the present invention, and FIG. 5 is a sectional view taken along line C-C of FIG. 4. Figure 6 is a cross-sectional view of the bottom cover.
FIG. 7 is a partially cutaway vertical cross-sectional view showing the electric shaver in the state when it is subjected to a fall impact; FIG. 7 is a partially cutaway longitudinal cross-sectional view of the electric shaver showing the second embodiment of the present invention; FIG. The figure is a partially cutaway vertical sectional view of an electric shaver showing a third embodiment of the present invention.
FIG. 9 is a perspective view of a contact spring used in the electric shaver of FIG. 8. 2...Battery storage case, 7...Battery, 8...Contact spring, 19...Space, L...Installation position of contact spring 8.

Claims (1)

[Scope of utility model registration request] In a battery-using device in which a battery is held in a battery storage case via a contact spring installed at the bottom of the case, the contact spring is deformed toward the bottom from the installation position of the contact spring at the bottom of the case. A battery-powered device that is characterized by having a space that allows for it.