CN215941689U

CN215941689U - Hand-held cutting tool

Info

Publication number: CN215941689U
Application number: CN202121918812.6U
Authority: CN
Inventors: 杨育; 周俊松; S·格鲁布莱希特
Original assignee: Hilti AG
Current assignee: Hilti AG
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2022-03-04
Anticipated expiration: 2031-08-16

Abstract

A hand-held cutting tool comprising a housing, a handle mounted outside the housing, a motor mounted inside the housing, a shroud at least partially housing a cutting tool, and a dust bin attached to the shroud, the dust bin having a dust collection inlet for receiving chips produced by a workpiece being cut by the cutting tool during a cutting operation, a dust collection chamber for receiving the chips, a dust collection outlet for discharging the chips, the dust collection chamber comprising a first side facing a motor mounting side and an opposite second side, a rear end facing a user, and a bottom surface generally facing the workpiece being cut, the dust collection outlet being provided at the second side. The handheld cutting tool is provided with the small, light, firm and durable dust collection box, flying chips or dust generated in cutting operation can be efficiently and safely received, accumulated dust chips can be conveniently poured out, and the operation experience of a user of the handheld cutting tool is improved.

Description

Hand-held cutting tool

Technical Field

The present invention relates to a cutting tool, and more particularly, to a hand-held cutting tool with a dust collecting function.

Background

Hand held cutting tools are a widely used power tool for cutting workpieces such as wood, metal and many other materials. Typically, the hand-held cutting tool includes a variety of power tools having a rotary cutter for cutting a workpiece to be machined, such as circular saws, angle grinders, wall lathes, angle grinders, blenders, planers, and the like. When the cutting tool is used for cutting, the material removed from the workpiece, such as chips or dust, is carried up and scattered by the rotation of the tool. Therefore, the blades of the cutting tool are usually at least partially covered with a shield to prevent scattering of chips, and a dust collecting device for collecting the flying chips or dust is connected to the shield.

When the hand-held tool completes the cutting operation or the amount of flying chips or dust accumulated in the dust collecting device reaches a certain amount, the chips or dust need to be discharged from the dust collecting device. In the prior art, the dust collection outlet is typically at the end of the dust collection device, i.e., the side closer to the user. When dumping waste flying chips, the user needs to rotate the cutting tool from a substantially horizontal orientation to a substantially vertical orientation so that the chips can exit the dust collection outlet, which affects the user's operational experience of the hand held cutting tool, and at this time the chips are dumped from the dust collection outlet towards the user, which can also affect the user's safety if the temperature of the chips is too high.

Moreover, the dust collecting outlet of the common dust collecting device is sealed by a cover which is connected through a buckle or matched with a sliding rail, after the dust collecting device is used for many times, the cover is easy to damage or can not be completely sealed, even the cover drops in the cutting operation engineering, and the hidden danger that high-temperature cutting scraps fly to a user exists.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a handheld cutting tool, which is provided with a dust collection box capable of efficiently and safely receiving flying chips or dust generated in the cutting operation process, and the dust collection box can conveniently dump the chips accumulated in the dust collection box.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a hand-held cutting tool comprising a housing, a handle mounted on the exterior of the housing, a motor mounted on the interior of the housing, a shroud at least partially housing a cutting tool, and a dust bin attached to the shroud, the dust bin having a chip collection inlet for receiving chips generated by a workpiece being cut by the cutting tool during a cutting operation, a dust collection chamber for receiving the chips, a dust collection outlet for discharging the chips, the dust collection chamber comprising a first side facing the side on which the motor is mounted and an opposite second side, a rear end facing a user, and a bottom surface generally facing the workpiece being cut, the dust collection outlet being provided at the second side.

According to a preferred embodiment of the present invention, the dust collection outlet is opened or closed by a pivotable door.

The second side defines a pivot axis and the door is mounted to the pivot axis by a hinge. Preferably, the door is mounted to the pivot by two hinges, one of which is semi-open and the other of which is closed. More preferably, the pivot includes first and second opposite ends, and the hinge includes first and second hinges mounted to the first and second ends of the pivot, respectively, wherein the first hinge is semi-open and the second hinge is closed.

According to another preferred embodiment of the utility model, the pivot axis is arranged substantially parallel to the mounting direction of the dust bin when attached to the hood, and the bottom surface comprises a stop formation at least partly abutting an end surface of the second hinge. Preferably, the bottom surface further comprises an arcuate flange partially encircling the side surface of the second hinge.

According to a further preferred embodiment of the utility model, the pivot axis is arranged substantially parallel to a mounting direction of the dust bin when attached to the hood, and the second side comprises a stop formation at least partly abutting a second end of the pivot axis.

According to a further preferred embodiment of the utility model, the door is provided with a transparent window.

The hand-held cutting tool is provided with the dust box which is small, light, firm and durable. When the action of pouring the smear metal is carried out to the user, only need to incline certain angle with cutting means to the side, the interior dirt bits of dust collection box will very easily come out from the collection dirt export, and user's operation is more convenient, has also avoided the dirt bits to be moved towards the user when being poured simultaneously, brings safer, convenient operation experience for cutting means's user.

Drawings

The embodiments are best understood from the following detailed description when read with the accompanying drawing figures. It is emphasized that the various features are not necessarily drawn to scale. In fact, the dimensions may be arbitrarily increased or decreased for clarity of discussion. In the drawings, like numbering represents like elements.

FIG. 1 illustrates an overall schematic view of an exemplary hand-held cutting tool according to the present invention;

FIG. 2 is a top view of the hand held cutting tool shown in FIG. 1;

FIG. 3 is a plan sectional view of the hand held cutting tool of FIG. 2 taken along line A-A;

FIG. 4 is a schematic view of a dust bin of an exemplary hand held cutting tool of the present invention;

figure 5 is a schematic view of another angle of the dust bin shown in figure 4;

fig. 6 is an exploded view of a dust bin of an exemplary hand held cutting tool of the present invention.

Detailed Description

Hereinafter, a hand-held cutting tool according to an embodiment of the present invention will be described with reference to fig. 1 to 5. The expressions "forward", "rearward", "above", "below", "left" and "right" in this disclosure are used throughout the specification to define various parts of the hand held cutting tool when disposed in an orientation in which it is intended to be used, such as the orientation shown in fig. 1.

According to one exemplary embodiment of the present invention, a hand held cutting tool includes, but is not limited to, a circular saw 1. As shown in fig. 1 to 3, the circular saw includes a housing 2, a handle 3 mounted outside the housing, a motor (not shown) mounted inside the housing, a shroud 4 at least partially covering a cutting tool, and a dust box 5 attached to the shroud 4. As shown in fig. 1 and 2, the shield 4 includes a left side surface 4a covering a left side of an upper area of a radially outer peripheral edge of the cutting blade 6; a right side surface 4b located on the right side of the cutting blade 6 and fixed to the housing 2; and a peripheral wall 4c connecting upper ends of the left side surface 4a and the right side surface 4 b. Referring to fig. 3, the peripheral wall 4c is formed in a circular arc shape and covers an upper area of the radially outer peripheral edge of the cutting blade 6. The shroud 4 is provided with a chip channel 4d therein, the chip channel 4d being located substantially above the teeth of the cutting blade 6.

The handle 3 is mounted above the housing 2 adjacent to the right side of the guard 4 and is disposed substantially parallel to the working direction of the circular saw, i.e., the front-rear direction. The dust box 5 is detachably attached to the rear end of the hood 4, preferably by means of a snap-in design, the dust box 5 is slid from the upper end of the hood to a set position along the snap-in on the hood, i.e. mounted in place.

Referring to fig. 4 and 5, the dust box 5 has a dust collection inlet 50, a dust collection chamber 51 for receiving the cutting chips, and a dust collection outlet 52 for discharging the cutting chips. When the circular saw is used for cutting, the user holds the handle 3, and the saw blade cuts the workpiece and moves forward, and chips generated by the cutting of the workpiece fly into the dust collection inlet 50 of the dust box 5 along the chip passage in the guard 4. A guide passage 53 is provided between the dust collection inlet 50 and the dust collection chamber 51, and the guide passage 53 communicates the dust collection inlet 50 and the dust collection chamber 51. The flying chips generated when the circular saw performs a cutting work pass through the dust collection inlet 50, the guide passage 53, enter the dust collection chamber 51, and are accumulated in the dust collection chamber 51.

The dust collecting chamber 51 includes a first side 54 (i.e., the right side as viewed in fig. 1) facing the side of the circular saw where the motor is mounted, a second side 55 (i.e., the left side as viewed in fig. 1) opposite the first side 54, a rear end surface 56 facing the user, an engaging surface 57 facing the rear end of the shroud 4, and a bottom surface 58 generally facing the workpiece to be cut. Preferably, the first side 54, the rear end 56, the second side 55 and the engagement surface 57 are integrally formed to define a cavity with a recess adapted to the rear end of the shroud. The bottom surface 58 is also shaped as a square surface with a corresponding recess adapted to the rear end of the shroud and is removably connected to the cavity formed by the first side surface, the rear end surface, the second side surface and the engagement surface to form a substantially square dust chamber having a recess for receiving the rear end of the shroud. A dust box 51 may be mounted to the rear end of the hood 4 in a-a direction as shown in fig. 3 and 4.

Preferably, the dust collecting chamber has a width in the left-right direction of the circular saw shown in fig. 1 greater than that of the guard, and the distance from the second side surface 55 to the left side surface 4a of the guard 4 is greater than that from the first side surface 55 to the right side surface 4b of the guard 4. Preferably, the second side 55 does not exceed the width of the base plate of the cutting tool, so as not to interfere with the cutting operation under certain operating conditions.

According to a preferred embodiment of the present invention, as shown in fig. 1 to 5, the dust collection outlet 52 is provided at a second side 55 of the dust collection chamber, i.e. the side facing away from the motor and the handle (the left side in fig. 1), i.e. the direction in which the dust is poured out and the direction in which the dust flies into the dust collection chamber are not identical, preferably the direction in which the dust is poured out is substantially perpendicular to the direction in which the dust flies into the dust collection chamber. The dust collection outlet 52 is used to dump away flying debris or dust that accumulates in the dust collection chamber. Thus, when the user performs the chip discharging operation, the hand-held cutting tool is tilted sideways by a certain angle, preferably 90 degrees, so that the dust or flying chips in the dust collecting chamber can easily come out of the dust collecting outlet. Especially for the hand-held tool, the user needs to hold the handle all the time, and the overall portability of the cutting tool has great influence on the use experience. The dust collecting outlet is arranged on the side face of the handheld cutting tool in the machining direction, so that the handheld cutting tool is more convenient for a user to operate, meanwhile, dust or flying chips are prevented from falling to the user, and safer and more convenient operation experience is brought to the user of the cutting tool.

According to a preferred embodiment of the present invention, the dust collection outlet 52 is opened or closed by a pivotable door 7. The door 7 covers the entire second side, alternatively, it may be a part of the second side. The door 7 is further provided with a catch 70 which when engaged with the dust collecting compartment causes the door 7 to be held in a closed position, and the catch 70 is opened to allow the door 7 to be opened. The dust box can be made smaller and simpler in structure as a whole by opening or closing the dust collection outlet through the pivotable door 7. Alternatively, the dust collection outlet may be opened or closed by a sliding door or drawer structure.

Preferably, the second side 55 has a pivot 59 formed thereon. The pivot 59 includes opposing first and second ends 60 and 61. The pivot may be formed directly on the second side or alternatively, the pivot may be a separate component mounted to the second side 55. The door 7 is mounted to the pivot 59 by a hinge. Preferably, the hinge comprises two, one of which is semi-open and the other of which is closed. As shown in fig. 4-6, the hinge includes a first hinge 62 mounted to the first end 60 of the pivot and a second hinge 63 mounted to the second end 61 of the pivot, wherein the first hinge 62 is semi-open and the second hinge 63 is closed. The hinge with one end being semi-open and the hinge with the other end being closed enables the connection structure of the door and the pivot to be more firm and reliable, and avoids the risk that the door is easily separated from the pivot.

According to another preferred embodiment of the utility model the pivot 59 is substantially parallel to the mounting direction a-a of the dust bin when attached to the hood, as shown in fig. 3 and 4. The bottom surface includes a stop structure 64 that at least partially abuts an end surface of the second hinge 63. The process of mounting the door 7 to the dust box is as follows. First, the closed second hinge 63 is sleeved on the second end 61 of the pivot, then the semi-open first hinge 62 is clamped on the first end 60 of the pivot, and then the bottom surface 58 is connected to the first side surface, the rear end surface and the second side surface, and the stop structure on the bottom surface is just abutted against part of the end surface of the second hinge 63, so that the door is axially limited to move relative to the pivot. The second closed hinge also limits the radial movement of the door relative to the pivot, so that the door 7 is firmly arranged at a dust collection outlet of the dust collection box, the door cannot be separated from the dust collection box even if the door is pulled more conventionally under severe working conditions, and the durability of the dust collection box is greatly improved.

Preferably, the bottom surface further comprises an arcuate flange 65 partially encircling the side surface of the second hinge. The arcuate flange substantially surrounds the second hinge 63 within the dust collection chamber to prevent high temperature fly debris from damaging the second hinge during the accumulation process.

According to a further preferred embodiment of the utility model, the pivot axis is arranged substantially perpendicular to a mounting direction a-a of the dust bin when attached to the hood, and the second side comprises a stop structure (not shown) at least partly abutting against a second end of the pivot axis. In practice, the direction in which the pivot is arranged is mainly determined by the consideration of the arrangement of the stop structure, and the pivot may be arranged in any direction as long as the stop structure can prevent the axial movement of the closed hinge and does not interfere with the installation of the hinge.

According to a further preferred embodiment of the utility model, the door is provided with a transparent window 71 for observing the amount of dust or flying debris accumulated in the dust collecting chamber in order to clean the dust collection in a timely manner.

As described above, although the exemplary embodiments of the present invention have been described in the specification with reference to the drawings, the present invention is not limited to the above-described specific embodiments, but may be in many other embodiments, and the scope of the present invention should be defined by the claims and their equivalents.

Claims

1. A hand-held cutting tool comprising a housing, a handle mounted outside the housing, a motor mounted inside the housing, a guard at least partially covering a cutting tool, and a dust bin attached to the guard, the dust bin having a dust collection inlet for receiving chips produced by a workpiece being cut by the cutting tool during a cutting operation, a dust collection chamber for receiving the chips, a dust collection outlet for discharging the chips, the dust collection chamber comprising a first side facing a side on which the motor is mounted and an opposite second side, a rear end face facing a user, and a bottom face facing the workpiece being cut, characterized in that the dust collection outlet is provided at the second side.

2. The hand-held cutting tool of claim 1, wherein the dust collection outlet is opened or closed by a pivotable door.

3. The hand-held cutting tool of claim 2, wherein the second side defines a pivot axis thereon, and the door is mounted to the pivot axis via a hinge.

4. The hand held cutting tool of claim 3, wherein the door is mounted to the pivot by two hinges, one of which is semi-open and the other of which is closed.

5. The hand held cutting tool of claim 4, wherein the pivot includes first and second opposing ends, and the hinge includes first and second hinges mounted to the first and second ends of the pivot, respectively, wherein the first hinge is semi-open and the second hinge is closed.

6. The hand held cutting tool of claim 5 wherein said pivot axis is generally parallel to a mounting direction of said dust bin when attached to said shroud, said bottom surface including a stop formation at least partially abutting an end surface of said second hinge.

7. The hand-held cutting tool of claim 6, wherein the bottom surface further comprises an arcuate flange partially encircling a side surface of the second hinge.

8. The hand held cutting tool of claim 5 wherein the pivot axis is generally perpendicular to a mounting direction of the dust bin when attached to the shroud, and the second side includes a stop feature at least partially abutting an end surface of the second hinge.

9. A hand held cutting tool according to any one of claims 2 to 8 wherein the door is provided with a transparent window.