JPS6040251Y2 - rechargeable portable power tools - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a rechargeable portable power tool in which a main body part and a bundle part housing a battery are detachable.

Some conventional devices of this type have a circuit breaker built into the main body for overload protection, but although this protects the motor from overload, short-circuiting between the battery charging terminals can cause battery burnout. It had the disadvantage of causing

This invention was devised in view of the above-mentioned conventional circumstances, and one embodiment of this invention will be illustrated below with reference to FIGS. 1 and 2 in the case of a rechargeable portable electric drill.

In the figure, 1 is a main body, which includes a casing 11, a motor 12 fixed in the casing 11, and a main body.
A gear type reducer 13 driven by
A tool drive shaft 14 that protrudes from 1 and also serves as the output shaft of the reducer 13, a chuck 15 that is fixed to one end of the tool drive shaft 14 and grips a drill-shaped tool (not shown), and a front lower part of the casing 11. an operation switch 16 disposed in the
The switch lever 17 is pivotally connected to the casing 11 at the rear of the operation switch 16 and operates the switch 16.

Reference numeral 2 denotes a bundle part detachably attached to the main body part 1, which includes a casing 21, a plurality of batteries 22 disposed inside the casing 21 and feeding power to the motor 12, and the batteries 2.
2, and a circuit breaker 24 connected as shown in FIG.

With such a structure, when the switch 16 is turned on, the motor 12 is operated and the drill bit is rotated, so that drilling work can be performed.

Further, when the motor 12 becomes overloaded, the circuit breaker 24 is turned off to prevent the motor 12 from burning out.

Furthermore, even if the charging terminals 23 are short-circuited, the circuit breaker 24 is turned off, so that burning out of the battery 22 can be prevented.

As described above, this idea is an extremely simple device in which the Imaichi Brake Force is placed on the bundle side, which not only protects the motor from overload but also protects the battery charging terminal from short circuits. This has the effect of providing a rechargeable portable power tool.

[Brief explanation of the drawing]

The figures are drawings showing one embodiment of this invention, with FIG. 1 being an overall configuration diagram and FIG. 2 being an electric circuit diagram. In the figure, 1 is a main body, 11 is a casing, 12 is a motor, 14 is a tool drive shaft, 2 is a bundle part, 21 is a casing, 22 is a battery, 23 is a charging terminal, 24 is a circuit breaker, and a breaker. Note that the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A main body casing that houses a motor that rotationally drives a tool drive shaft and a bundle that houses a battery that supplies power to the motor are detachable, and a circuit breaker that is connected in series to the power supply circuit is installed in the bundle. A rechargeable portable power tool characterized by being stored.