CN102335785A

CN102335785A - Handheld tool

Info

Publication number: CN102335785A
Application number: CN2010102394885A
Authority: CN
Inventors: 闵军辉; 陈德高
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2010-07-21
Filing date: 2010-07-21
Publication date: 2012-02-01

Abstract

The invention relates to a handheld tool. The handheld tool comprises a work assembly which is used for driving a motor of the work assembly, a shell and a transmission assembly which is accommodated in the shell and transfers the power of the motor to the work assembly; the whole shell extends lengthwise; the shell comprises a shell front part which is used for arranging the work assembly and a shell rear part which is used accommodating the motor; and the shell rear part is provided with an installation part of a battery pack which provides power for the motor, and a holding part which is positioned between the shell front part and the shell rear part.

Description

Hand-held tool

Technical Field

The present invention relates to a hand-held tool, and more particularly, to a hand-held tool provided with a battery pack.

Background

In order to relieve the inconvenience of long power cords, a battery pack is often arranged on the hand-held tool to provide power for the operator. The housing of a conventional hand-held tool is provided in an elongated shape, and the working assembly is located at the front of the housing; the motor is arranged close to the working assembly and is accommodated in the middle of the shell for holding; the battery pack is arranged at the rear part of the motor. The handheld tool is compact in structure, small in size, flexible and suitable for machining small workpieces.

However, the heaviest parts of the tool are generally the working component and the motor, the working component and the motor of the handheld tool are arranged in the middle and the front of the whole machine, the weight of the whole machine is unbalanced, an operator must apply extra force to keep the tool stable to operate the handheld tool smoothly, the cutting precision is low, and the handheld tool is easy to feel fatigued during operation.

Disclosure of Invention

The invention provides a hand-held tool which is comfortable to operate.

In order to achieve the purpose, the technical scheme of the invention is as follows: a hand-held tool comprising a working assembly; a motor for driving the working assembly; a housing; a transmission assembly accommodated in the housing and transmitting the power of the motor to the working assembly; the whole casing that is the lengthwise extension, including the installation the casing front portion of working component accepts the casing rear portion of motor, the casing rear portion is equipped with for the installation department of the battery package that the motor provided power, and is located the casing front portion reaches the portion of gripping between the casing rear portion.

Preferably, the center of gravity of the hand-held tool is located on the holding part after the hand-held tool is connected with the battery pack.

Preferably, the installation direction of the battery pack is parallel to the axis of the motor.

Preferably, the battery pack has a body extending in a longitudinal direction, and the longitudinal direction of the body is parallel to the axis of the motor.

Preferably, the working assembly comprises an installation part of the working head, the installation part is positioned on one side of the shaft axis of the motor, and the battery pack and the installation part of the working head are positioned on the same side of the shaft axis of the motor.

Preferably, the motor extends along a longitudinal direction, and the battery pack is at least partially located within a longitudinal extension length of the motor.

Preferably, the battery pack is detachably connected with the shell.

Preferably, the battery pack comprises a base, an upper cover and a battery unit located between the base and the upper cover, and a contact terminal is arranged in the upper cover and electrically connected with the motor.

Preferably, the battery pack comprises three battery units arranged in a triangle.

Preferably, the hand-held tool is an electric circular saw, and the working assembly includes a saw blade, a shield movably disposed relative to the housing, and a stopper limiting a movement range of the shield.

Compared with the prior art, the hand-held tool has the advantages that the center of gravity of the whole hand-held tool is located near the center of the holding part through the arrangement of the battery pack and the motor, so that an operator does not need to apply extra force to keep the hand-held tool balanced, the hand-held tool can keep balance in a normal holding mode, the operation is more comfortable, and the operator is not easy to feel fatigue. The installation mode of the battery pack effectively utilizes the space, ensures that a user has sufficient holding space, reduces the volume of the tool and has more compact appearance.

Drawings

The invention is further described with reference to the following figures and embodiments.

FIG. 1 is a schematic cross-sectional view of a hand-held tool according to an embodiment of the present invention;

FIG. 2 is a perspective view of the hand held tool disclosed in FIG. 1 with the shield in a first position;

FIG. 3 is a perspective view of the hand held tool disclosed in FIG. 1 with the shield in a second position;

FIG. 4 is an exploded perspective view of the hand held tool disclosed in FIG. 1;

fig. 5 is an exploded perspective view of the battery pack of the hand tool disclosed in fig. 1.

Wherein,

20 housing 33 base of mating part 61

22 housing front 42 blade 62 catch

24 holding part 44 motor 63 upper cover

26 housing rear 48 switch assembly 64 battery pack mounting

27 shroud chassis 50 drive assembly 66 battery cavity

28 shroud 51 gearbox 68 contact terminal

29 saw blade through hole 52 drive shaft 69 battery unit

30 depth adjusting device 53 mounting part 70a-d shield side wall of working head

31 arc opening 54 interface 100 hand tool

32 stop device 60 battery pack F insertion direction

Detailed Description

Referring to fig. 1-4, a hand tool 100 includes a housing 20, a motor 44 disposed within the housing 20, a saw blade 42 driven by the motor 44, and a transmission assembly 50 for transmitting power. In accordance with the usual manner of use of such hand-held tools by an operator, the left side in fig. 1 is defined as the front of the hand-held tool 100 and the right side is defined as the rear of the hand-held tool 100. The housing 20 includes a housing front 22, a housing rear 26, and a grip 24 connecting the housing front 22 and the housing rear 26. The housing 20 may be an injection molded part and may be constructed from two half shells. A transmission assembly 50 is provided between the motor 44 and the saw blade 42 for transmitting power from the motor 44 to the saw blade 42 to drive the saw blade 42 to rotate. The transmission assembly 50 includes a gear box 51 and a transmission shaft 52, which are respectively accommodated in the housing front portion 22 and the holding portion 24. A gear transmission mechanism is arranged in the gear box 51, and the gear transmission mechanism can be in worm gear transmission or bevel gear transmission, and converts the rotary motion of the motor along the X axis into the rotary motion of the saw blade along the Y axis. The saw blade 42 is mounted to a mounting portion 53 of the working head disposed within the front portion 22 of the housing. The mounting portion 53 of the working head may be a screw-fastening structure or a cam-clamping structure, and in the present embodiment, the mounting and releasing of the saw blade 42 is realized by the screw-fastening structure. A shield 28 is provided on the front housing portion 22 to prevent an operator's hand from accidentally contacting the saw blade 42, thereby providing a safety guard. The shield 28 surrounds the housing front 22 in a surrounding manner, the shield 28 includes a bottom plate 27, the shield bottom plate 27 is provided with a saw blade through hole 29, the shield bottom plate 27 contacts with the surface of the workpiece during operation, and the saw blade 42 passes through the saw blade through hole 29. The shroud 28 further includes four shroud sidewalls 70a-d that extend upwardly from the shroud floor 27 in a generally perpendicular configuration, and are slidably coupled to the housing front 22 by rails (not shown) and the mating portion 33. The guide rail is provided on one of the shroud 28 and the case front 22, and the mating portion is provided on the other of the shroud 28 and the case front 22. The mating portion 33 is configured to mate with and be movable along the guide track, the shield 28 is movable relative to the housing front 22 between a first position and a second position when the mating portion 33 is moved along the guide track, the saw blade 42 is not exposed from the blade through hole 29 when the shield 28 is in the first position, and the saw blade 42 is at least partially exposed from the blade through hole 29 when the shield 28 is in the second position, wherein the hand tool 100 is operable to machine a workpiece. The front housing portion 22 is further provided with a depth adjustment device 30 for adjusting the cutting depth, and the depth adjustment device 30 includes an arc-shaped opening 31 provided on the front housing portion, and a limiting device 32 movably installed in the arc-shaped opening. The spacing device 32 includes a clamping mechanism that clamps or unclamps the spacing device 32 relative to the housing sidewall to limit the range of movement of the shield 28 and thereby adjust the depth of cut of the saw blade 42. The grip portion 24 is provided with a switch assembly 48 for controlling the battery pack 60 to provide power to the motor 44, and the tips of the fingers of the operator are positioned adjacent to the switch assembly 48 in the normal gripping mode. The rear housing portion 26 has a motor 44 disposed therein, the axis of the motor 44 is parallel to the longitudinal extension direction of the housing 20, and a mounting portion 64 for mounting a battery pack of the battery pack 60 is disposed below the motor 44, wherein in the present embodiment, the mounting portion 64 includes a battery cavity 66 for accommodating the battery pack and an interface 54 for interfacing with the battery pack 60. The battery pack mounting portion 64 may also not include a battery cavity 66 for receiving a battery pack, and the battery pack 60 may be mounted to the housing rear portion 26 via rails or other attachment means to interface with the interface 54.

Referring to fig. 5, the battery pack 60 includes a main body extending along a longitudinal direction, and includes a base 61, an upper cover 63, and a battery unit 69 located between the base 61 and the upper cover 63, wherein the battery unit 69 is disposed in a triangular shape, and a contact terminal 68 is further disposed in the upper cover 63, and when the battery pack 60 is inserted into the housing 20, the contact terminal 68 is electrically connected to the interface 54 in the housing 20, so as to provide power for the motor 44. The base 61 is provided with a hook 62 that mates with a recess (not shown) provided in the housing rear 26 to lock and release the battery pack 60.

Referring to fig. 1, the housing rear portion 26 of the housing 20 is substantially parallelogram-shaped in cross-section, and the battery pack 60 is mounted on the hand tool 100 in a mounting direction F parallel to the axial line X of the motor 44; when the battery pack 60 is inserted into the hand-held tool 100, the extending direction of the main body of the battery pack 60 is parallel to the axial lead of the motor; the battery pack 60 is disposed at the lower portion of the motor 44, and is located at the lower side of the axial line as the mounting portion 53 for mounting the working head of the saw blade 42, and the main body of the battery pack 60 extending in the longitudinal direction may be disposed closer to the holding portion with respect to the main body of the motor 44, or may be disposed at a distance farther from the holding portion with respect to the main body of the motor 44 or the same distance as the holding portion, in this embodiment, the battery pack 60 is disposed at a distance farther from the holding portion with respect to the main body of the motor 44, and the front end of the battery pack is located at a substantially middle position.

Referring to fig. 2, the weight of the body of the hand tool 100 is primarily concentrated on the following metal components: a shield 28, a saw blade 42, a gear box 51, and a motor 44. The shield 28, the gear box 51 and the saw blade 42 are located at the front end of the holding portion 24, and the motor 44 is located at the other end of the holding portion 24, when the battery pack 60 is connected to the rear portion 26 of the housing, the center of gravity of the whole machine is located near the center of the holding portion 24 due to the installation position of the battery pack 60, so that the operator does not need to apply extra force to balance the hand-held tool 100, and the hand-held tool 100 can be balanced in a normal holding manner, thereby ensuring that the operation is more comfortable and the operator does not feel tired easily. The battery pack 60 is mounted in a manner that effectively utilizes space, ensures that a user has sufficient holding space, reduces the volume of the tool, and has a more compact appearance. In the present embodiment, the battery unit 60 is accommodated inside the housing rear 26, and it is conceivable for those skilled in the art that the battery unit 60 may be suspended on the housing rear 26 by a connecting device; in the present embodiment, the battery unit 60 is locked by a hook 62 provided on a base 61, and it is conceivable for those skilled in the art to fix other kinds of locking devices to the housing rear 26. Of course, the invention is not limited to the specific embodiments disclosed in the specification. Any variations and substitutions made on the basis of the present invention are within the scope of the invention.

Claims

1. A hand-held tool comprising:

a working assembly;

a motor for driving the working assembly;

a housing;

a transmission assembly accommodated in the housing and transmitting the power of the motor to the working assembly; the method is characterized in that: the whole casing that is the lengthwise extension, including the installation the casing front portion of working component accepts the casing rear portion of motor, the casing rear portion is equipped with for the installation department of the battery package that the motor provided power, and is located the casing front portion reaches the portion of gripping between the casing rear portion.

2. The hand-held tool of claim 1, wherein: after the handheld tool is connected with the battery pack, the center of gravity is located on the holding part.

3. The hand-held tool of claim 1, wherein: the installation direction of the battery pack is parallel to the axial lead of the motor.

4. The hand-held tool of claim 3, wherein: the battery pack is provided with a main body extending in the longitudinal direction, and the longitudinal extending direction of the main body is parallel to the axis of the motor.

5. The hand-held tool of claim 1, wherein: the working assembly comprises a mounting part of the working head, the mounting part is positioned on one side of the motor axial lead, and the battery pack and the mounting part of the working head are positioned on the same side of the motor axial lead.

6. The hand-held tool of claim 1, wherein: the motor extends along the lengthwise direction, and the battery package is located at least partly within the motor lengthwise extension.

7. The hand-held tool of claim 1, wherein: the battery pack is detachably connected with the shell.

8. The hand-held tool of claim 1, wherein: the battery pack comprises a base, an upper cover and a battery unit, wherein the battery unit is positioned between the base and the upper cover, and a contact terminal is arranged in the upper cover and electrically connected with the motor.

9. The hand-held tool of claim 1, wherein: the battery pack comprises three battery units which are arranged in a triangular shape.

10. The hand-held tool of claim 1, wherein: the hand-held tool is the electric circular saw, the work subassembly includes the saw bit, the mobilizable guard shield that sets up of relative casing, and restriction the locating part of guard shield displacement range.