WO2017145641A1

WO2017145641A1 - Electric power tool

Info

Publication number: WO2017145641A1
Application number: PCT/JP2017/002949
Authority: WO
Inventors: 直人若田部; 寺西　卓也; 政幸小倉; 勇佑船引
Original assignee: 日立工機株式会社
Priority date: 2016-02-24
Filing date: 2017-01-27
Publication date: 2017-08-31
Also published as: JPWO2017145641A1; JP6540877B2

Abstract

In order to prevent chattering attributable to vibration of an electric power tool from arising between the respective terminals of the electric power tool main body and of a battery pack, in the case where a battery pack mounting section (2) is provided with: an electric power tool main body having a positive power-receiving terminal (71) and a negative power-receiving terminal (72); and a battery pack which has a positive power supply terminal (81) to be connected to the positive power-receiving terminal (71) and a negative power supply terminal (82) to be connected to the negative power supply terminal (72), and which is removably mounted to the battery pack mounting section (2), the positive power-receiving terminal (71) and the negative power-receiving terminal (72) are provided to terminal holders (61, 62), respectively, and each of the terminal holders (61, 62) is disposed so as to be independently movable with respect to a battery pack disposition unit (10a) that serves as a housing part in the battery pack mounting section (2).

Description

Electric tool

The present invention relates to a power tool having a configuration in which a battery pack can be detachably attached to a power tool body.

2. Description of the Related Art Generally, an electric tool is known in which a battery pack is detachable from an electric tool main body incorporating an electric motor, and the battery pack is attached during use. In this type of electric power tool, there is a gap between the electric power tool body and the battery pack in order to facilitate the operation of attaching and detaching the battery pack to and from the electric power tool body. If the power tool body vibrates during work due to this gap, the terminal on the power tool body side and the terminal on the battery pack side may rub against each other, or contact between the terminals and the non-contact state may be repeated (chattering). there's a possibility that.

In Patent Document 1 below, in order to cope with the problem caused by the gap between the power tool body and the battery pack, the battery pack mounting portion of the power tool body is provided with an elastic protrusion, and the battery pack is mounted on the battery pack mounting portion. This prevents the battery pack from rattling.

JP 2014-154465 A

However, in an electric tool having a large vibration during use, such as a rotary hammer drill, even if the above-described prior art is adopted, the battery pack vibrates with respect to the electric tool main body and the electric tool main body side terminal and the battery pack side terminal There is a possibility that chattering may occur between the terminals and the terminals may overheat and the housing portion of the battery pack mounting portion of the power tool body may melt.

The present invention has been made in view of such a situation, and an object thereof is to provide an electric tool capable of preventing chattering from occurring between the electric tool main body and the battery pack terminal due to vibration of the electric tool. .

One embodiment of the present invention is a power tool. The power tool has a power tool body having a positive power receiving terminal and a negative power receiving terminal, a positive power terminal connected to the positive power receiving terminal, and a negative power terminal connected to the negative power receiving terminal in the battery pack mounting portion. And a battery pack that is detachably attached to the battery pack attachment portion, and the interval between the positive power receiving terminal and the negative power receiving terminal is variable.

Another embodiment of the present invention is also a power tool. This power tool has a power tool body having a positive power receiving terminal and a negative power receiving terminal at a battery pack mounting portion where a battery pack can be detachably mounted, and the positive power terminal is connected to a positive power terminal of the battery pack. The negative power receiving terminal is connected to a negative power source terminal of the battery pack, and the interval between the positive power receiving terminal and the negative power receiving terminal is variable.

In each of the above aspects, it is preferable that the positive power receiving terminal and the negative power receiving terminal are independently movable within a predetermined range with respect to the terminal mounting portion in the battery pack mounting portion.

In each of the aspects, the positive power receiving terminal and the negative power receiving terminal are provided in separate terminal holders, respectively, and each terminal holder is provided independently and movably with respect to the housing portion of the battery pack mounting portion. It is good to be.

In each of the above aspects, the positive power receiving terminal and the negative power receiving terminal may be provided independently and movably with respect to a terminal holder attached to a housing portion of the battery pack mounting portion.

Each of the positive power receiving terminal and the negative power receiving terminal has an inner connection end located inside the electric power tool main body and an outer connection end exposed to the outside from the electric power tool main body, and the inner connection end and the It is preferable that the outer connection end be movable in the same direction.

The battery pack may be slid and mounted on the battery pack mounting portion, and the positive power receiving terminal and the negative power receiving terminal may be configured to be movable in a direction intersecting the sliding direction.

The inner connection end and the outer connection end may be movable substantially parallel to the intersecting direction.

A mounting hole for mounting the terminal holder is provided in the battery pack mounting portion, and a groove or a convex portion that engages with an edge portion of the mounting hole is formed in a portion facing the mounting hole of the terminal holder. It is good that it is the structure which did.

It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

According to the power tool of the present invention, the distance between the positive power receiving terminal and the negative power receiving terminal provided in the battery pack mounting portion of the power tool main body is variable, so that it is durable against vibrations generated during work of the power tool. Thus, chattering between the electric power tool body and the battery pack terminal can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view of the hammer drill as Embodiment 1 of the electric tool which concerns on this invention. The side view of the said hammer drill. The bottom view of the battery pack mounting part of the main body of the hammer drill. FIG. 3 is a plan view of the battery pack with the terminal portion of the battery pack according to Embodiment 1 facing upward. The expanded sectional side view of the said battery pack mounting part of the state which mounted | wore the said battery pack. FIG. 6 is a partial sectional view taken along line AA in FIG. 5. The principal part expanded side sectional view of the said battery pack mounting part. B arrow view of FIG. FIG. 2 is a terminal holder having a positive power receiving terminal according to Embodiment 1, wherein (A) is a left side view, (B) is a front view, (C) is a right side view, and (D) is a bottom view. FIG. 2 is a terminal holder having a negative power receiving terminal according to Embodiment 1, wherein (A) is a left side view, (B) is a front view, (C) is a right side view, and (D) is a bottom view. FIG. 6 is an enlarged side cross-sectional view showing a main part configuration of Embodiment 2 and showing a battery pack mounting part. FIG. 6 is an enlarged side cross-sectional view showing a main part configuration of Embodiment 3 and showing a battery pack mounting part. 4A and 4B are positive and negative power receiving terminals used in Embodiment 3, wherein FIG. 5A is a perspective view seen from the left direction, FIG. 5B is a front view, and FIG. 5C is a perspective view seen from the right direction.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

The overall configuration of the hammer drill as the first embodiment of the electric power tool according to the present invention will be described with reference to FIGS. In addition, the vertical direction and the front-back direction in the following description are defined in FIG.

A hammer drill 100 as an electric tool includes a main body 1 of a hammer drill and a battery pack 5 that is detachably attached to a battery pack attachment portion 2 of the main body 1.

The main body 1 of the hammer drill has a main body housing 10 integrally formed with a handle 11, an electric motor 20 and a power transmission mechanism 30 built in the main body housing 10, and a tip that receives the driving force of the electric motor 20 via the power transmission mechanism 30. A tool detaching mechanism 50 is provided. The handle 11 is a portion that is gripped when an operator uses the hammer drill 100, and a trigger 12 for controlling the driving of the electric motor 20 is provided here.

The hammer drill 100 is used in a state where a battery pack 5 serving as a power source is mounted on the battery pack mounting portion 2 of the main body 1 and a tip tool (not shown) is mounted on the tip tool detaching mechanism 50. The hammer drill 100 has, as operation modes, a rotation impact mode in which the tip tool rotates and strikes, a rotation mode in which only the rotation is performed, and an impact mode in which only the impact is performed.

The motor 20 has a rotation output shaft 21 pivotally supported in the vertical direction within the main body housing 10, and an upper end portion thereof is a pinion 22. The power transmission mechanism 30 includes an intermediate shaft 31 that is pivotally supported in a direction substantially orthogonal to the rotation output shaft 21 in the main body housing 10, and a bevel gear 32 that is fixed to the rear end portion of the intermediate shaft 31 and meshes with the pinion 22. The sleeve 33 slidably provided on the outer periphery of the intermediate shaft 31, the clutch mechanism 34 for switching the operation mode, the transmission gear 35, the motion conversion unit 36 provided on the outer periphery of the intermediate shaft 31, and the transmission gear 35. Are fixed to the cylinder 37, a piston 38 that slides in the cylinder, an impactor 39, and an intermediate element 40. As the rotation output shaft 21 of the motor 20 rotates, the bevel gear 32 that meshes with the pinion 22 rotates, and the intermediate shaft 31 rotates integrally therewith.

The sleeve 33 can rotate integrally with the intermediate shaft 31 (depending on the operation mode of the clutch mechanism 34) and meshes with a transmission gear 35 fixed to the outer periphery of the cylinder 37. The cylinder 37 rotates as the sleeve 33 rotates. To do. The rotational force of the intermediate shaft 31 is transmitted to the sleeve 33 via the clutch mechanism 34.

The clutch mechanism 34 has a function of switching the operation mode of the hammer drill 100, and includes a rotation impact mode in which the rotation of the intermediate shaft 31 is transmitted to the sleeve 33 and the motion conversion unit 36, a rotation mode in which only the sleeve 33 is transmitted, and a motion conversion. The batting mode transmitted only to the portion 36 is switched (for example, switching is performed by an operation mode switching lever that can be operated by an operator from the outside of the main body housing 10).

The motion conversion unit 36 includes a rotation unit 41 provided on the outer periphery of the intermediate shaft 31 and an arm unit 44 that holds a ball 43 that is rotatably engaged with a concave groove 42 on the outer surface of the rotation unit 41. The rotating portion 41 can rotate integrally with the intermediate shaft 31 (depending on the operation mode of the clutch mechanism 34). When the rotating portion 41 rotates, the ball 43 moves along the concave groove 42, and the upper end portion of the arm portion 44 moves back and forth. Reciprocates in the direction.

The piston 38 is connected (pivoted) to the upper end portion of the arm portion 44, and reciprocates in the front-rear direction in the cylinder 37 in conjunction with the reciprocating motion of the arm portion 44. The cylinder 37 slidably accommodates the piston 38 and the intermediate element 40. The striker 39 is slidably provided in the piston 38 in the front-rear direction. An air chamber 38 a is formed in the piston 38 by the rear end surface of the striker 39 and the bottomed inner peripheral surface of the piston 38. The intermediate element 40 is located in front of the striker 39.

The tip tool attaching / detaching mechanism 50 is provided in front of the main body housing 10, is connected to the tip portion of the cylinder 37, and has a tool holding portion 51 that detachably holds the tip tool.

In the rotary hammering mode of the hammer drill 100, when the intermediate shaft 31 rotates, rotational force is transmitted to the cylinder 37 via the sleeve 33 and the transmission gear 35, and the cylinder 37 and the tip tool attaching / detaching mechanism 50 rotate. At the same time, as the intermediate shaft 31 rotates, the tip of the arm portion 44 of the motion converting portion 36 reciprocates in the front-rear direction. When the piston 38 connected to the arm portion 44 moves rearward, the air in the air chamber 38a expands and the pressure decreases. At this time, since the pressure in the space formed between the striker 39 and the intermediate piece 40 is higher than the pressure in the air chamber 38a, the striker 39 moves rearward. When the piston 38 moves forward, the air in the air chamber 38a is compressed, the striker 39 is accelerated forward by the expansion of the compressed air, and the meson 40 is struck by the striker 39 and passes through the meson 40. A striking force is applied to the tip tool held by the tip tool detaching mechanism 50. The striking is repeated by the reciprocating motion of the piston 38.

In the rotation mode of the hammer drill 100, the rotational force is transmitted to the cylinder 37 via the sleeve 33 and the transmission gear 35. However, since the clutch mechanism 34 does not transmit the rotation of the intermediate shaft 31 to the motion conversion unit 36, the arm unit 44 is Do not reciprocate. As a result, only the rotational force is transmitted to the tip tool.

In the hammering mode of the hammer drill 100, the rotational force of the intermediate shaft 31 is transmitted only to the motion conversion unit 36 via the clutch mechanism 34. Thereby, the rotational force of the intermediate shaft 31 is converted into a reciprocating motion by the motion converting portion 36 and transmitted to the piston 38. As the piston 38 reciprocates, only the striking force is transmitted to the tip tool via the striking element 39 and the intermediate element 49.

The configuration of the battery pack mounting portion 2 of the main body 1 of the hammer drill and the configuration of the battery pack 5 that is detachably mounted thereon will be described with reference to FIGS. 3 to 10.

The battery pack mounting portion 2 includes a battery pack placement portion 10a of the main body housing 10,

terminal holders

61 and 62 of insulators (for example, resin) provided on the battery pack placement portion 10a so as to be movable within a predetermined range, and a terminal holder 61. A positive power receiving terminal 71 provided on the terminal holder 62, and a negative power receiving terminal 72 provided on the terminal holder 62. The positive power receiving terminal 71 and the negative power receiving terminal 72 are plate-like metal terminals and are integrally provided together with the

terminal holders

61 and 62 by insert molding or the like. As a result, the positive power receiving terminal 71 and the negative power receiving terminal 72 are fixed through the

terminal holders

61 and 62, and the inner connection ends of the main housing 10 of the positive power receiving terminal 71 and the negative power receiving terminal 72 are the lead wires 75. It is connected to a drive power supply circuit that supplies power to the electric motor 20.

As shown in FIGS. 5 to 8, the battery pack disposition portion 10 a of the main body housing 10 is formed with a thin step portion 13 that is recessed inward, and the

terminal holders

61 and 62 are loosely coupled to the thin step portion 13 ( A mounting hole 14 (for example, a square hole) that is movably fitted) is formed. On the other hand, as shown in FIGS. 9 and 10, the

terminal holders

61 and 62 each have a prismatic portion, and outer

peripheral grooves

61 a and 62 a that engage with an edge portion (thin stepped portion 13) of the mounting hole 14 on the outer periphery. Each is formed. The outer peripheral grooves 61a and 62b are provided in the portions of the

terminal holders

61 and 62, which are regions facing the edge portions when the

terminal holders

61 and 62 are engaged with (attached to) the edge portions of the mounting holes 14. The sum of the cross-sectional areas passing through the outer

peripheral grooves

61a and 62a of the

terminal holders

61 and 62 is set smaller than the opening area of the mounting hole 14 (that is, between the thin step portion 13 and the terminal holders 61 and 62). Since there is a gap), each of the

terminal holders

61 and 62 and the positive and negative

power receiving terminals

71 and 72 can move within a predetermined range independently of the battery pack arrangement portion 10a of the main body housing 10. Since the

terminal holders

61 and 62 are movable to the left and right or front and rear along the outer

peripheral grooves

61a and 62a with respect to the battery pack arrangement portion 10a, the positive and negative

power receiving terminals

71 and 72 are connected to the inner connection ends (the body housing 10). The entire terminal from the side connected to the lead wire 75) to the outer connection end (side exposed to the outside of the main body housing 10 and connected to each terminal of the battery pack 5) is the gap described above. It can move left and right or back and forth. That is, the inner connection end and the outer connection end are movable in the same direction. In other words, each of the

power receiving terminals

71 and 72 is movable substantially parallel to the battery pack placement portion 10a along the outer

peripheral grooves

61a and 62a. Although the outer

peripheral grooves

61a and 62a are formed in the outer peripheral portions of the

terminal holders

61 and 62, grooves are formed in the battery pack arrangement portion 10a (the edge portion of the mounting hole) of the main body housing 10, and the grooves are formed on the terminal holder side. You may form the convex part to engage.

As shown in FIGS. 3 and 6, the main body housing 10 is formed by abutting and integrating the left and right housing divided

bodies

10A and 10B, and before the housing divided

bodies

10A and 10B are abutted, The

respective terminal holders

61 and 62 can be inserted into the.

As shown in FIG. 4, the battery pack 5 includes an insulator (for example, resin) casing 6 in which a battery cell is built. The casing 6 has a pair of rails 80 on both sides of the surface facing the battery pack placement portion 10a, and a terminal holding substrate 85 (shown in phantom lines in FIG. 6) is placed and fixed between the pair of rails 80. The holding substrate 85 is provided with a positive power supply terminal 81 connected to the positive power reception terminal 71 and a negative power supply terminal 82 connected to the negative power reception terminal 72 (fixed). As shown in FIG. 6, the positive power supply terminal 81 and the negative power supply terminal 82 on the battery pack 5 side have a pair of metal contact portions that sandwich the plate-shaped positive power reception terminal 71 and the negative power reception terminal 72 on the main body housing 10 side. .

On both sides of the battery pack 5, there are provided a latch 87 for retaining and an operation button 86 for retracting the latch 87. The battery pack mounting portion 2 of the main body housing 10 is formed with a concave groove (not shown) that engages with the pair of rails 80 on the battery pack 5 side and a concave portion (not shown) that engages with the latch 87. ing. The battery pack 5 is mounted on the battery pack mounting portion 2 by inserting the rail 80 into the concave groove on the battery pack mounting portion 2 side and sliding (sliding) the battery pack 5 forward. In the battery pack mounting state, the positive power receiving terminal 71 is sandwiched between the pair of contact portions of the positive power supply terminal 81, and the negative power receiving terminal 72 is sandwiched between the pair of contact portions of the negative power supply terminal 82. At this time, the positive power receiving terminal 71 and the negative power receiving terminal 72 are independently movable within a predetermined range with respect to the battery pack placement portion 10a of the main body housing 10. Specifically, each of the positive power receiving terminal 71 and the negative power receiving terminal 72 intersects the sliding direction of the battery pack 5 (the front-rear direction in FIG. 1) (the direction intersecting the front-rear direction and the upper-lower direction in FIG. 1). ) Can be moved independently. Therefore, even if there is a dimensional tolerance in the distance between the positive power receiving terminal 71 and the negative power receiving terminal 72 and the distance between the positive power terminal 81 and the negative power terminal 82, the distance between the positive power receiving terminal 71 and the positive power terminal 81 is not limited. The contact load and the contact load between the negative power receiving terminal 72 and the negative power supply terminal 82 are uniform.

Therefore, even when a large vibration is applied to the battery pack 5 by using the hammer drill 100 in, for example, the rotary impact mode or the impact mode when the battery pack is mounted, the positive power receiving terminal 71 and the positive power supply terminal 81 are integrally formed in a combined state. Because it moves, it can hold the necessary contact load. Similarly, since the negative power receiving terminal 72 and the negative power supply terminal 82 move together in a combined state, a necessary contact load can be maintained. Therefore, it is possible to prevent the chattering phenomenon between the terminals due to the vibration when the hammer drill 100 is used. In the case of the rotation mode, the vibration of the hammer drill 100 is smaller than that in the impact mode, so that the chattering phenomenon between the terminals can be prevented.

According to the present embodiment, the following effects can be achieved.

(1) A positive power receiving terminal 71 and a negative power receiving terminal 72 connected to the positive power terminal 81 and the negative power terminal 82 on the battery pack side are provided (fixed) in the

terminal holders

61 and 62, respectively. 61 and 62 are movably provided independently of the main body housing portion of the battery pack mounting portion 2 (the thin step portion 13 of the battery pack arrangement portion 10a), so that the positive power receiving terminal 71 and the positive power source terminal 81 are provided. And the contact load of the negative power receiving terminal 72 and the negative power supply terminal 82 can be maintained evenly regardless of the dimensional tolerance between the terminals, and chattering phenomenon between the terminals can be prevented. Since heat generation due to the chattering phenomenon can be prevented, the present invention can be applied to the application of supplying a large current from the large-capacity battery pack 5 to the main body 1 of the hammer drill. Moreover, it becomes possible to extend the lifetime of the contact part of each terminal.

In addition, since each of the positive power receiving terminal 71 and the negative power receiving terminal 72 is configured to be movable substantially parallel to the battery pack placement portion 10a, the occurrence of chattering between the terminals can be prevented. For example, when the outer connection end side is configured to be swingable with the inner connection end side of each power receiving terminal as a fulcrum, if the outer connection end side swings away from each other due to dimensional tolerance with the terminal on the battery pack 5 side, There is a possibility that the terminal will bite (bite into) the battery pack placement portion 10a and cannot swing. Furthermore, since the base part (the part supported by the main body housing) on the outer connection end side connected to the terminals of the battery pack 5 is less separated from the tip part, it is easily affected by dimensional tolerances, and the contact load Cannot be maintained evenly and chattering phenomenon cannot be prevented. According to the present invention, since the entire terminal can move in the left-right or front-back direction, the occurrence of chattering between the terminals can be reliably prevented.

When the positive power receiving terminal 71 and the negative power receiving terminal 72 are fixed to one terminal holder, and one terminal holder is provided movably with respect to the main body housing portion of the battery pack mounting portion 2, the terminal holder side Due to the dimensional tolerance between the inter-terminal distance and the inter-terminal distance on the battery pack side, the contact load becomes non-uniform and the chattering phenomenon between the terminals tends to occur.

(2) By providing the

terminal holders

61 and 62 in the thin stepped portion 13 in which the battery pack placement portion 10a of the main body housing 10 is recessed, the front end surfaces of the

terminal holders

61 and 62 do not protrude from the battery pack placement portion 10a. can do. For this reason, the battery pack 5 can be smoothly attached and detached.

(3) The main body housing 10 is one in which the left and right housing divided

bodies

10A and 10B are abutted and integrated, and before the housing divided

bodies

10A and 10B are abutted, each terminal is placed inside the mounting hole 14 of the battery pack mounting portion 2. By inserting the

holders

61 and 62, it can be easily assembled. In addition, there is no need to provide special parts, and since it is not necessary to change the shape of the main body housing 10 (particularly, the battery pack mounting portion 2) from the past, it is possible to reduce manufacturing costs (without adding parts or correcting the mold) ) Chattering phenomenon between terminals can be prevented.

FIG. 11 shows a main configuration of the second embodiment of the present invention. In the second embodiment, the battery pack mounting portion 2A of the main body of the hammer drill includes a battery pack mounting portion 10a that is a part of the main body housing and an insulator (for example, mounted in the mounting hole 15 of the battery pack mounting portion 10a). Resin) and a positive power receiving terminal 71 and a negative power receiving terminal 72 which are provided on the terminal holder 63 so as to be independently movable within a predetermined range. In this case, the terminal holder 63 serving as a terminal attachment site may be fixed to the battery pack placement portion 10a, and each of the

power receiving terminals

71 and 72 has a predetermined backlash in the through

holes

64 and 65 formed in the terminal holder 63, for example. It is inserted and attached so as to have a gap (gap). In order to attach and hold the

power receiving terminals

71 and 72 to the terminal holder 63, for example, an elastic member may be used together. Other configurations are the same as those of the first embodiment.

Also in the second embodiment, the positive power receiving terminal 71 and the negative power receiving terminal 72 connected to the positive power terminal 81 and the negative power terminal 82 on the battery pack side shown in FIG. (Battery pack placement portion 10a) is provided so as to be independently movable, so that the contact load of the set of positive power receiving terminal 71 and positive power supply terminal 81 and the set of negative power receiving terminal 72 and negative power supply terminal 82 Can be maintained evenly regardless of the dimensional tolerance between the terminals, and chattering phenomenon between the terminals can be prevented.

FIG. 12 shows a main configuration of the third embodiment of the present invention, and FIG. 13 shows a positive power receiving terminal 91 and a negative power receiving terminal 92 to be used. In the third embodiment, the battery pack mounting portion 2B of the main body of the hammer drill includes a battery pack placement portion 10a that is a part of the main body housing and an insulator (for example, a mounting hole 15 of the battery pack placement portion 10a). Resin) and a positive power receiving terminal 91 and a negative power receiving terminal 92 which are provided on the terminal holder 66 so as to be independently movable within a predetermined range. In this case, the terminal holder 66 serving as a terminal mounting portion has through

holes

67 and 68 into which the positive power receiving terminal 91 and the negative power receiving terminal 92 are inserted, and the positive power receiving terminal 91 and the negative power receiving terminal 92 are formed around them. A locking portion 69 that locks the retaining portion 95 is integrally provided. As shown in FIG. 13, the retaining portion 95 can be formed so as to have elasticity by cutting and raising the positive power receiving terminal 91 and the negative power receiving terminal 92, for example, and the positive power receiving terminal 91 and the negative power receiving terminal 92 are formed as shown in FIG. The holder 66 can be easily mounted by being inserted into the through

holes

67 and 68 from below to above. Further, by making the through

holes

67 and 68 larger than the thickness direction and width direction dimensions of the positive power receiving terminal 91 and the negative power receiving terminal 92, the

power receiving terminals

91 and 92 are independent from each other within a predetermined range with respect to the terminal holder 63. And can be moved freely. Other configurations are the same as those of the first embodiment.

Also in the third embodiment, the positive power receiving terminal 91 and the negative power receiving terminal 92 respectively connected to the positive power supply terminal 81 and the negative power supply terminal 82 on the battery pack side shown in FIG. (Battery pack placement portion 10a) is provided so as to be independently movable, so that the contact load of the set of positive power receiving terminal 91 and positive power supply terminal 81 and the set of negative power receiving terminal 92 and negative power supply terminal 82 Can be maintained evenly regardless of the dimensional tolerance between the terminals, and chattering phenomenon between the terminals can be prevented.

The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

In the above embodiment, the hammer drill has been described as an example of the electric tool. However, the present invention can be applied to various electric tools including an electric working machine using a battery pack as a driving source such as a mowing machine mounted with a battery pack. It is clear that there is.

DESCRIPTION OF SYMBOLS 1 ... Hammer drill main body, 2, 2A, 2B ... Battery pack mounting part, 5 ... Battery pack, 10 ... Main body housing, 10a ... Battery pack arrangement part, 11 ... Handle, 12 ... Trigger, 13 ... Thin step part, 14, DESCRIPTION OF SYMBOLS 15 ... Mounting hole, 20 ... Electric motor, 30 ... Power transmission mechanism, 50 ... Tip tool attaching / detaching mechanism, 61, 62, 63, 66 ... Terminal holder, 61a, 62a ... Outer peripheral groove, 71, 91 ... Positive power receiving terminal, 72 92 ... Negative power receiving terminal, 80 ... Rail, 81 ... Positive power supply terminal, 82 ... Negative power supply terminal, 85 ... Terminal holding substrate, 100 ... Hammer drill

Claims

An electric power tool body having a positive power receiving terminal and a negative power receiving terminal in the battery pack mounting portion;
A battery pack having a positive power supply terminal connected to the positive power reception terminal and a negative power supply terminal connected to the negative power reception terminal, and detachably attached to the battery pack attachment portion;
The power tool characterized in that the interval between the positive power receiving terminal and the negative power receiving terminal is variable.
In the battery pack mounting portion where the battery pack can be detachably mounted, the power tool main body having a positive power receiving terminal and a negative power receiving terminal is provided.
The positive power receiving terminal is connected to the positive power terminal of the battery pack, and the negative power receiving terminal is connected to the negative power terminal of the battery pack,
The power tool characterized in that the interval between the positive power receiving terminal and the negative power receiving terminal is variable.
3. The positive power receiving terminal and the negative power receiving terminal are provided so as to be independently movable within a predetermined range with respect to a terminal mounting portion in the battery pack mounting portion. Electric tool.
The positive power receiving terminal and the negative power receiving terminal are provided in separate terminal holders,
4. The electric tool according to claim 1, wherein each terminal holder is provided so as to be independently movable with respect to a housing portion of the battery pack mounting portion. 5.
4. The positive power receiving terminal and the negative power receiving terminal are provided so as to be independently movable with respect to a terminal holder attached to a housing portion of the battery pack mounting portion. The electric tool according to claim 1.
Each of the positive power receiving terminal and the negative power receiving terminal has an inner connection end located inside the electric power tool main body, and an outer connection end exposed to the outside from the electric power tool main body,
The electric tool according to any one of claims 3 to 5, wherein the inner connection end and the outer connection end are movable in the same direction.
The battery pack is slid and mounted on the battery pack mounting portion,
The power tool according to any one of claims 3 to 6, wherein the positive power receiving terminal and the negative power receiving terminal are movable in a direction intersecting the sliding direction.
The electric tool according to claim 7, wherein the inner connection end and the outer connection end are movable substantially parallel to the intersecting direction.
The battery pack mounting part is provided with a mounting hole for mounting the terminal holder,
The power tool according to any one of claims 3 to 8, wherein a groove or a convex portion that engages with an edge portion of the mounting hole is formed in a portion of the terminal holder that faces the mounting hole. .