JPS6335042B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electrical equipment such as power tools.

As shown in FIGS. 1 and 2, an electric device such as a conventional power tool has a motor 2 disposed within a housing 1, and a forward/reverse selector switch 3 and an on/off switch 4 disposed below the motor 2. , these are connected by lead wires 5 as shown in FIG. 2, and the power receiving terminals 6 and 7 are implanted in the partition wall 8 of the housing 1, and a battery pack (not shown) is placed in the cavity 9 under the partition wall 8. By loading the battery, the power terminal of the pack was brought into contact with the power receiving terminal. 10 is a lock button for locking the operation of the on/off switch 4. In this way, when the on/off switch 4 is turned on, power is supplied to the motor 2, and when the forward/reverse switch 3 is turned on, the direction of rotation is changed.

However, this electrical device has the drawbacks that the wiring using the lead wires 5 is complicated, the number of solderings of the lead wires 5 is large, the assembly of parts is complicated, and the housing 1 requires ample space for wiring. It was hot.

Therefore, an object of the present invention is to provide an electrical device that can be easily assembled and downsized.

The electrical device of the present invention is an electrical device in which a switch device is provided in the device main body, and a battery pack that supplies power to the device main body via the switch device is detachably attached to the device main body, and the switch device is provided with a power receiving terminal. The battery pack is characterized in that the battery pack is provided with a power terminal that comes into electrical contact with the power receiving terminal when the battery pack is attached.

According to the configuration of the present invention, since the power receiving terminal is provided in the switch device, there is no need to connect a lead wire between the switch device and the power receiving terminal as in the conventional case, and the power receiving terminal is housed separately from the switch device. This eliminates the work of attaching the wire to the wire, significantly improves the ease of assembling the wire, and saves space for wiring, making it possible to downsize.

Electric equipment including an embodiment of the power tool of the present invention is shown in FIGS. 3 to 12. In other words, the main body of this electrical device has two pistol-shaped parts.
A split housing 11 forms a body part 12 and a handle part 13, a motor 14 is installed in the rear end of the body part 12, a transmission 15 is arranged in front of the motor 14,
A speed reducer 16 is disposed on the front side, a chuck 17 is provided at the front end of the body 12, and a speed change handle device 18 for switching the transmission 15 is provided above the motor 14 at the rear end of the body 12. Also, the handle part 13
Inside, a battery pack 19 containing a rechargeable battery 19a is removably loaded using a hook operating part 19b.
A switch device 20 is provided near the base of the handle portion 13 for turning on/off the power and switching forward/reverse rotation, and power from the rechargeable battery is supplied to the motor 14 via the switch device 20. In this way, the switch device 20
The motor 14 is operated, and the rotational speed is changed by the transmission 15 and transmitted to the chuck 17 via the reduction gear 16. Note that a torque adjustment device 21 is incorporated in the reduction gear 16.

Now, the switch device 20 has a structure in which a movable terminal block 24 is supported by a switch cover 23 on the upper surface of the terminal block 22, a switch handle 25 is provided on the terminal block 22, and a switching handle 26 is provided on the switch cover 23. Both are made of insulating material. First, when viewed from the side, the terminal block 22 has a substantially inverted L shape consisting of a horizontal portion 27 and a vertical portion 28, and the vertical portion 28 is slightly inclined toward the horizontal portion. A vertical partitioning rib 29 is provided at the center of the front side of the vertical portion 28, a pair of fixing protrusions 30, 31 are formed at the lower end of the front surface with the vertical partitioning rib 29 in between, and a pair of conductor plate springs 32, 33 are formed on this. Holes 32a, 3 at the lower end of
The plate springs 32 and 33 are fixed by fitting the fixing protrusions 30 and 31 and heat-sealing them. The upper end portions of these leaf springs 32 and 33 extend forward and upward of the horizontal portion 27, and contact points 34 and 35 are provided protrudingly on the horizontal portion side as shown in FIG. 9, and on the opposite side, respectively.
A spring receiving projection 36 is provided. Also, the leaf spring 32,
A spring receiving protrusion 37 is formed facing the vertical part 28 at a position corresponding to the upper end of the vertical part 28 in the middle part of the leaf springs 32, 33, and extends in the width direction at the lower end of the leaf springs 32, 33 and is bent at a right angle. A support plate 38 located on the side surface of the lower end of the vertical portion 28 of the terminal block 22 is formed, and the support plate 38
A width plate 41 that determines the contact position for the power terminals 39, 40 (FIG. 4) formed at the upper end of the battery pack 19 is extended perpendicularly from the end of the battery pack 19.
further parallel to the support plate 38 than the end of the terminal block 22
A planar U-shaped plate 4 located behind the vertical part 28 of the
2 and 43 extend, and their free ends are tilted in the direction in which they face each other to form power receiving terminals 44 and 45 that contact the power supply terminals 39 and 40. A guide box 46 parallel to the horizontal part 27 is formed below the horizontal part 27 at the upper end of the vertical part 28 of the terminal block 22, an opening 47 is formed in the front end of the guide box 46, and a guide groove 48 is formed in the inner wall. Spring receiving holes 49 are formed on both sides of the opening 47, and as shown in FIG.
Compression coil springs 50 are installed between the spring receiving protrusions 37 of No. 2 and 33, respectively, and provide an opening force that urges the leaf springs 32 and 33 in a direction away from the terminal block 22.

The switch cover 23 is box-shaped with its lower end and front end open, and as shown in FIG. When the housing 11 is positioned on the horizontal portion 27 by being engaged with the
It is fixed on the horizontal part 27 by the rib 11a. This switch cover 23 has a horizontally long rectangular guide hole 54 formed in the front end of the upper plate 53, and a step wall 55 protruding upward through the guide hole 54 on the front end side. At the center of the front is the axle stand 5.
A shaft 57 is provided on the shaft stock 56 by protruding forward, and a pair of recesses 58 are provided on the lower surface of the shaft stock 56.
(FIG. 6) is formed to receive the upper end portions of the leaf springs 32, 33, and to restrict the operating range of the leaf springs 32, 33. Further, as shown in FIG. 11, three positioning triangular cross-section grooves 58a to 58a are arranged in the longitudinal direction of the guide hole 54 on the lower surface of the rear end side of the guide hole 54 of the upper plate 53.
58c, and a guide plate 59 is suspended further to the rear end side of these grooves 58a to 58c.

The movable terminal block 24 has a rectangular shape that is supported in front of the guide plate 59 in the switch cover 23 so as to be slidable in the horizontal direction on the upper surface of the horizontal portion 27. A pair of protrusions 60a, 60b are formed to form protrusions 60a, 60b.
A cam groove 61 is formed between the protrusions 60a and 60b.
Both ends of a plate spring 63, which has protrusions 62 bent to engage with the positioning grooves 58a to 58c formed on the rear end side of the movable terminal block 24, are fixed, and three thin strips are provided on the lower surface of the movable terminal block 24, opening at the front end and the lower end. Grooves 64a to 64c
are formed at regular intervals, a communication groove 65 is formed across the narrow grooves 64a to 64c as shown in FIG. A pair of second terminal plates 68a, 68b bridged by a bridging piece 67 are buried in 64a, 64c, and their rear ends are supported by the inner ends of the narrow grooves 64a to 64c to form a circular arc. The front end protrudes from the front of the movable terminal block 24, and the front end surface is connected to the fixed contact 6.
9a to 69c, and terminal plates 68a, 6
Lead wires 70a, 7 for connecting the motor to the rear end of 8b.
The end of 0b is soldered. Further, a lock protrusion 71 is provided that hangs down from a predetermined position on the lower surface of the front end of the movable terminal block 24 to the front surface of the horizontal portion 27. The movable terminal block 24 configured in this way can slide laterally within the switch cover 23, but since the protrusion 62 of the leaf spring 63 engages with the positioning grooves 58a to 58c, the movable terminal block 24 can be slid laterally within the switch cover 23. It can be moved to three positions. At this time, the fixed contacts 69a to 69c are the contact points 3 of the leaf springs 32 and 33.
4 and 35, and more precisely, when the leaf springs 32 and 33 are brought close to the fixed contacts 69a to 69c, the movable terminal block 24
When in positions on both sides engaging c, the contacts 34,
35 is fixed contact 69a, 69b or fixed contact 6
The dimensional relationship is such that it contacts 9a and 69c.

The switching handle 26 vertically passes through a shaft hole 72 in the center, and has a downward operating protrusion 73 formed at one end.
The other end is an operating section 74. When the shaft hole 72 of the switching handle 26 is rotatably fitted to the shaft 57 of the switch cover 23, the operating projection 73 engages with the cam groove 61 formed by the projections 60a, 60b of the movable terminal block 24. Also housing 1
When attached to the handle part 13 of No. 1, the operating part 74 protrudes from a hole 75 formed on the front side of the base of the handle part 13. On the other hand, the operating section 7 of this switching handle 26
4 in the horizontal direction, the switching handle 26 rotates around the shaft 57, and the operation protrusion 73 rotates and pushes the protrusions 60a and 60b, thereby moving the movable terminal block 24 in the transverse direction, and Protrusion 62 of spring 63
moves from groove 58a to groove 58c. At this time,
Due to the spring action of the protrusion 62, the switching handle 26 provides a click feeling when operated.

The switch handle 25 has an operation surface 76 on one side.
A guide plate 77 is protruded from the opposite side, a lock protrusion 78 is formed at a predetermined position on the upper surface of the guide plate 77, and a pair of spring receiving holes 79 are formed at the upper end of the opposite side as shown in FIG. Furthermore, a locking protrusion 76a hangs down from the lower end as shown in FIG. The switch handle 25 is slidably inserted into the opening 47 of the terminal block 22 through a guide plate 77 between the leaf springs 32 and 33, and is supported by the leaf springs 32 and 33.
A compression coil spring 80 is installed between the spring receiving projection 36 and the spring receiving hole 79 to apply contact pressure. Further, when attached to the handle portion 13, a locking protrusion 76a projects outward from the lower part of the switching handle 26 of the hole 75 and locks with the lower edge of the hole 75. Therefore, when the handle portion 13 is grasped and the operating surface 76 of the switch handle 25 is pulled with the index finger, the compression coil spring 80 is compressed and the leaf springs 32 and 33 are compressed.
is bent, the coil spring 50 is compressed, and the contact point 3
Terminal plates 66, 68a, 68b facing 4, 35
The fixed contacts 69a to 69c are in contact with each other, and a constant contact pressure is applied between the contacts by compression of the compression coil spring 80. Further, when the index finger is released from the switch handle 25, the coil spring 50 is restored and the plate springs 32 and 33 are separated, and the coil spring 80 is restored and the switch handle 25 is restored. The relationship between the protrusion 78 and the lock protrusion 71 is as follows.
When the protrusion 62 of the movable terminal block 24 is engaged with the positioning groove 58b as shown in FIG. leaf spring 3
2 and 33 are disabled.

FIG. 12 is a list of operations of the switch device.
That is, column a in the figure shows a state in which the switching handle 26 has been rotated to the first position, and at this time, the lock protrusion 71 and the protrusion 78 do not face each other, and the protrusion 62 of the movable terminal block 24 is in the first position. The contacts 34 and 35 and the fixed contacts 69a and 6
9b face each other. Therefore, when the switch handle 25 is pulled, the contacts come into contact with each other and become conductive.
The power receiving terminals 44 and 45 of the leaf spring from the battery pack 19
The voltage input to is supplied to the motor lead wires 70a and 70b with the polarity shown in the figure. Column b in the figure shows a state in which the switching handle 26 has been rotated to the second position (neutral position). At this time, the movable terminal block 24 moves and the spring protrusion 62 engages with the second positioning groove 58b of the switch cover 23, and the switch handle 25
The protrusion 78 and the lock protrusion 71 face each other, and the fixed contacts 69a to 69c are all connected to the contacts 34 and 35.
will no longer face. In this case, when the switch handle 25 is pulled, the contacts 34 and 35 are moved to the movable terminal block 25.
The protrusion 78 hits the lock protrusion 71 before it contacts the switch handle 25, making it impossible to push the switch handle 25 any further. That is, this neutral state is a locked state. Column c in the figure shows a state in which the switching handle 26 has been rotated to the third position, the spring protrusion 62 is engaged with the third positioning groove 58c, and the protrusion 78 is not opposed to the lock protrusion 71. , contacts 34 and 35 face fixed contacts 69a and 69c. Therefore, when the switch handle 25 is pulled, those contacts 34 and 35
are in contact with each other, and the lead wires 70a and 70b have the a
The polarity opposite to the operation of is displayed, and the motor 14 rotates in the opposite direction to that of a.

As described above, according to the electrical device of the present invention,
Since the switch device is provided with a power receiving terminal, the ease of assembly is significantly improved and the device can be made smaller.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is a wiring diagram thereof, Fig. 3 is a partially sectional side view of a power tool to which an embodiment of the present invention is applied, Fig. 4 is a sectional view taken along the line Figure 5 is an exploded perspective view of the switch device, Figure 6
The figure is a sectional view of the switch device, FIG. 7 is a half-sectional front view thereof, FIG. 8 is a sectional view taken along the line ``-'', FIG. 9 is a sectional view taken along the line ``-'' ``FIG. 6'', and FIG. 10 is a sectional view taken along the line XX of FIG. 6.
11 is a sectional view taken along the line XI--XI in FIG. 6, and FIG. 12 is a list of operations of the switch device. 11...Housing of the device body, 14...Motor,
19...Battery pack, 20...Switch device, 39,
40...Power terminal, 44, 45...Power receiving terminal.

Claims (1)

[Scope of Claims] 1. An electric device in which a switch device is provided in the device body and a battery pack that supplies power to the device body via the switch device is detachably attached to the device body, wherein the switch device is provided with a power receiving terminal. . An electrical device, characterized in that the battery pack is provided with a power terminal that makes electrical contact with the power receiving terminal when the battery pack is attached. 2. The electrical device according to claim 1, wherein the device main body has a motor, and the switch device turns the motor on and off and switches between forward and reverse directions.