JPS5928948B2 - Charging safety device for devices with built-in secondary batteries - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charging safety device for equipment incorporating a rechargeable secondary battery. At the same time, by sliding the switch operation knob, the switch on the device side always operates on the safe side while the secondary battery is being charged, thereby ensuring the safety of the device.

Hereinafter, the present invention will be explained based on drawings showing embodiments thereof.

Figures 1 to 3 show an example in which a charging safety device according to an embodiment of the present invention is applied to an electric screwdriver. Rechargeable secondary battery 3, main switch 4, switch lever 5, switch safety knob 6, power transmission mechanism part T
Built-in. The power transmission mechanism T includes a pinion 8 directly connected to the prime mover 2, a gear 9 meshing with the pinion 8, and a pinion shaft 10 rotating together with the gear 9.
Bearing parts 11 and 11' that pivotally support the pinion shaft 10,
a main shaft gear 12 that meshes with the pinion shaft 10;
The main shaft gear 12 is inserted into the main shaft 13 so as to be movable and rotatable. Further, a disk body 14 is fixed to the outer periphery of the main shaft 13 so as to correspond to the side surface of the main shaft gear 12, and a recess 15 is provided on the side surface of the disk body 14.
has been established. Reference numeral 16 denotes a recess provided on the side surface of the main shaft gear 12 corresponding to the recess 15 of the disk body 14, and either the recess 16 or the recess 15 of the disk body 14 is loaded with a ball IT 018. is a stop plate attached to the main shaft 13, this stop plate 18 is for stopping a washer 19 provided on the outer periphery of the main shaft 13, a coil spring 20 is interposed between the washer 19 and the main shaft gear 12, The coil spring 20 biases the main shaft gear 12 so that it always comes into contact with the side surface of the disk body 14.

The main shaft 13 has one end protruding outside the main body 1, and a chuck 22 for holding a bit, etc. is fixed to the protrusion 21 of the main shaft 13.A hollow hole 23 is provided at the other end of the main shaft 13, and this hollow hole The hole 24 communicating with the main shaft gear 12
is provided at a position where it is stopped in the axial direction, and a ball or pin 25 is inserted into the communicating hole 24 so as to be freely retractable.
Further, a spindle 28 having a continuous tapered portion 27 formed at one end is movably inserted into the hollow hole 23 via a slope 26. Further, a recess 29 is formed in the axial stop portion of the main shaft gear 12, and this recess 29 prevents the ball or pin 25 from jumping out. Reference numeral 30 denotes a knob slidably held on the side surface of the main body 1. This knob 30 engages with a locking portion 28' provided at the other end of the spindle 28, and the knob 30 is slidably held on the side surface of the main body 1. By sliding, the spindle 28 can be moved in the axial direction.

Reference numeral 31 denotes a charging terminal portion of a secondary battery provided inside the rear surface of the main body 1, and has an opening portion 32.

Reference numerals 33 and 34 denote auxiliary switch parts having sliding knobs 35 and 36 facing the outside of the main body 1, and these auxiliary switch parts 33 and 34 are provided close to the charging terminal part 31.

A slide cover 37 opens and closes the opening 32 of the charging terminal portion 31, and the slide cover 37 has a through hole 38 through which the slideable knobs 35 and 36 pass, and is slidably held in the main body 1. ing.

Further, this slide cover 37 is spring-biased by a coil spring 39 in a direction that always closes the opening 32 of the charging terminal portion 31. And the slide cover 37 again? Since the slidable knobs 35 and 36 pass through, the slide cover 37 can be slid from the state shown in FIG. 3a to open the opening 32 of the charging terminal part 31 as shown in FIG. 3b. For example, the knobs 35 and 36 are automatically pushed to J by the slide cover 37, and the auxiliary switch parts 33 and 34 are changed from L (low speed) to H (high speed), for example.
Further, the rotation is switched from R (reverse rotation) to F (forward rotation), that is, the circuit is in a safe state. Then, from the opening 32 of the charging terminal portion 31, the charging plug 4 shown in FIG.
0 and connects it to the charging terminal section 31, the secondary battery 3 can be charged. Further, when charging is completed, by removing the charging plug 40 from the charging terminal section 31, the slide cover 37 is returned to its original state by the spring force of the coil spring 39, that is, the state shown in FIG. The opening 32 of the section 31 is closed. This allows you to prevent shots from outside. FIG. 4 shows an electric circuit diagram in the above embodiment, and when charging the secondary battery 3, the auxiliary switch section 3
Since the knob 35 of No. 3 is on the H (high speed) side, the six secondary batteries 3 are always connected in series.

In this case, when the secondary battery 3 is charged in a parallel connection state,
Although the secondary battery 3 becomes overloaded and causes a failure of the secondary battery 3 itself, this problem does not occur because the secondary batteries 3 are always connected in series in the present invention. Moreover, if the main switch 4 is turned on to the 4a side after charging of the secondary battery 3 is completed, for example, if the knobs 35 and 36 of the auxiliary switch parts 33 and 34 are located on the H side and the F side, respectively, the high Since a positive voltage potential is applied to the prime mover 2, the power of the main shaft 13 can be obtained in the normal rotation at a high rotational speed. Also, contrary to the above, the knobs 35 and 36 of the auxiliary switch parts 33 and 34 are set to L.
If the main shaft 13 is located on the R side or the R side, a low negative potential is applied to the prime mover 2, so that the power of the main shaft 13 is obtained at a low rotational speed in reverse rotation. Note that the auxiliary switch in the above embodiment is replaced with one that also serves as the main switch,
If the main switch is turned off when the slide cover 37 is slid to open the opening 32 of the charging terminal section 31, even if the main switch 4 of the device main body 1 is turned on when charging the secondary battery 3. Since no power is supplied to the load side, the secondary battery 3 and the like can be reliably protected.

As described above, according to the present invention, when charging a secondary battery, the opening of the charging terminal section is opened by operating the slide cover, and at the same time, the knob of the switch section is slid to switch the circuit to the safe side. This ensures the safety of the device, and when the charging plug is removed from the charging terminal after the secondary battery is fully charged, the slide cover automatically closes the opening of the charging terminal. This makes it possible to reliably protect the charging terminal portion from falling, etc., and also to help prevent the charging terminal portion from being shot.It has a simple structure and has various excellent features.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an electric screwdriver showing an embodiment of the present invention, FIG. 2 is a cross-sectional front view of main parts of the electric screwdriver showing a state in which a charging plug is inserted into the charging terminal portion, and FIG.
Figures A and b are front views showing the charging terminal section and auxiliary switch section, and Figure 4 is an electric circuit diagram of the electric screwdriver. 3... Secondary battery, 31... Charging terminal section, 32... Opening section, 33, 34... Switch section, 35, 36... ...Knob, 37...
...Slide cover, 40...Charging plug.

Claims (1)

[Scope of Claims] 1. A secondary battery charging terminal portion having an opening and a switch portion having a slidable knob facing the outside of the device body are provided adjacently, and the charging terminal portion has an opening. A slide cover that opens and closes is provided on the main body of the device, and by operating the slide cover, the opening of the charging terminal section is opened, and at the same time, the knob is slid to switch the circuit to the safe side, and the charging plug is inserted from the opening. A charging safety device for equipment containing a built-in secondary battery, which is inserted into a charging terminal section to charge the secondary battery. 2. The slide cover is biased in a direction to always close the opening of the charging terminal, and when the charging plug is removed from the charging terminal, the slide cover automatically closes the opening of the charging terminal. A charging safety device for a device incorporating a secondary battery according to claim 1.