CN215661162U - Dust collecting device and hand saw cutting tool - Google Patents

Abstract

The utility model provides a dust collecting device and a manual sawing tool. The dust collecting device (200) is arranged at the bottom of a shell of a hand sawing tool and comprises: a collecting portion (210), the collecting portion (210) defining a collecting opening (210s) facing a running area of a cutting tool of the hand sawing tool; a docking portion (220) spaced apart from the collecting portion (210), the docking portion (220) defining a discharge opening (220s) open at an end thereof; and a duct portion (230) connecting the collecting portion (210) with the docking portion (220), an inner surface (231) of the duct portion (230) defining a channel (230c), the channel (230c) communicating the collecting port (210s) with the discharge port (220 s).

Description

Dust collecting device and hand saw cutting tool

Technical Field

The utility model relates to the field of machining, in particular to a dust collecting device and a manual sawing tool with the same.

Background

A chain saw is a commonly used hand saw tool. Conventional chain saws are often used to cut wood in outdoor environments. As the field of application of chain saws expands, there is also a demand for chain saws in the construction field, for example, where concrete blocks need to be cut with chain saws at construction sites in order to adjust the concrete blocks to desired dimensions. However, cutting concrete blocks with conventional chain saws presents a number of problems. For example, concrete pieces, particles, dust, etc. cut by the chain saw can exit the block at a high velocity and then splash and spread into the surrounding environment, thereby causing environmental contamination and affecting the health of the operator. Moreover, if the above operation is performed in an indoor environment where air circulation is not facilitated, environmental pollution and health of operators are more seriously affected.

Therefore, there is a need in the art for a solution that effectively prevents the material cut by the chain saw from contaminating the surrounding environment and thus protecting the health of the operator.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems in the prior art, the present invention provides a dust collecting device, which is disposed at a bottom of a housing of a hand saw tool and includes:

a collection portion defining a collection opening facing a travel area of a cutting tool of the hand sawing tool;

a docking portion spaced apart from the collection portion, the docking portion defining a discharge opening open at an end thereof; and

a conduit portion connecting the collection portion with the docking portion, an inner surface of the conduit portion defining a channel communicating the collection port with the discharge port.

According to an alternative embodiment of the utility model, the docking portion is adapted to be docked at its end with a suction device or a dust bag.

According to an alternative embodiment of the utility model, the collecting portion comprises a bottom wall and a side wall extending upwards from an edge of the bottom wall, the bottom wall and the side wall together defining the collecting opening.

According to an alternative embodiment of the utility model, the side wall is connected at one end to the outer surface of the pipe portion and at the other end is spaced apart from the pipe portion so that the collecting opening also faces forward; and/or a portion of the sidewall extends rearward while extending upward; and/or the bottom wall is flush with the inner surface of the pipe portion.

Also, in order to solve the above problems in the prior art, the present invention provides a hand sawing tool including:

a housing having a first side and a second side spaced apart from each other;

a cutting tool disposed on a first side of the housing, wherein the hand saw tool further comprises a dust collection device as described above, wherein the conduit portion is located at a bottom of the housing, the collection portion is disposed on the first side of the housing, the collection port faces a travel area of the cutting tool, and the docking portion is disposed on a second side of the housing.

According to an alternative embodiment of the present invention, the dust collecting device is formed at the housing; alternatively, the dust collecting device is attached to the bottom of the housing.

According to an alternative embodiment of the utility model, the bottom of the dust collecting device is flush with the bottom of the housing.

According to an alternative embodiment of the utility model, the hand sawing tool further comprises a drive wheel and a locking cover attached to a first side of the housing and covering the drive wheel, the cutting tool being output for movement through the drive wheel, a confined space being defined between the housing and the locking cover, the confined space communicating the operating area of the cutting tool with the collection port.

According to an alternative embodiment of the utility model, the cutting tool is configured to contact and cut material along a portion of its path of movement, referred to as the active portion, the hand sawing tool further comprising a locking cover attached to the first side of the housing, the locking cover and the housing defining a confined space therebetween, the confined space communicating with the collection port, and the path of movement of the cutting tool extending into the confined space behind the active portion.

According to an alternative embodiment of the utility model, the hand sawing tool is a chain saw for cutting autoclaved aerated concrete.

The utility model may be embodied in the form of exemplary embodiments shown in the drawings. It is to be noted, however, that the drawings are designed solely for purposes of illustration and that any variations which come within the teachings of the utility model are intended to be included within the scope of the utility model.

Drawings

The drawings illustrate exemplary embodiments of the utility model. These drawings should not be construed as necessarily limiting the scope of the utility model, wherein:

fig. 1 is a perspective view of a chain saw equipped with a dust collecting device according to the present invention as one embodiment of a hand sawing tool according to the present invention;

FIG. 2 is a side view of the chain saw shown in FIG. 1 with the dust collection device removed;

FIG. 3 is another perspective view of the chain saw shown in FIG. 1, wherein the dust collection device has been removed;

FIG. 4 is a perspective view of a dust collection device according to the present invention;

FIG. 5 is another perspective view of the dust collection device shown in FIG. 4; and

fig. 6 is a sectional view of the dust collecting device shown in fig. 4.

Detailed Description

Further features and advantages of the present invention will become apparent from the following description, which proceeds with reference to the accompanying drawings. Exemplary embodiments of the utility model are illustrated in the drawings and the various drawings are not necessarily drawn to scale. This invention may, however, be embodied in many different forms and should not be construed as necessarily limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided only to illustrate the present invention and to convey the spirit and substance of the utility model to those skilled in the art.

The present invention is directed to a hand sawing tool, in particular a chain saw, and a dust collecting device mounted on the hand sawing tool. The manual saw cutting tool is particularly suitable for cutting autoclaved aerated concrete, and dust generated by cutting the autoclaved aerated concrete is efficiently removed by utilizing the dust collecting device assembled on the manual saw cutting tool, so that the dust is prevented from being diffused into the environment, the processing of the concrete can be smoothly carried out, and the health of operators is protected. As is well known, a chain saw is a commonly used hand sawing tool, and conventional chain saws are often used for cutting wood, such as tree cutting. With the expansion of the application field of chain saws, the demand for chain saws is also emerging in the construction field. Autoclaved aerated concrete is a light, porous, sound-insulating and heat-insulating material commonly used in the field of buildings, and is commonly used in high-rise frame buildings, buildings in earthquake-resistant areas, soft foundation buildings and the like. Although autoclaved aerated concrete blocks are generally pre-formed, they often need to be cut at the job site to adjust them to the desired dimensions. Unlike cutting timber in outdoor environments where construction sites are typically located in indoor environments, and where concrete pieces, particles, dust, etc. cut from concrete blocks are projected into the surrounding environment at a high rate and are thus dispersed into the surrounding annulus, if left dispersed into the surrounding environment, these materials tend to contaminate the indoor environment and affect the health of the operator, even rendering the cutting operation impossible to continue. The hand sawing tool according to the present invention can effectively prevent the cut material from spreading into the surrounding environment using the dust collecting device mounted thereon, and thus can be competent for the operation of cutting the material such as concrete blocks in indoor environments, and can reliably protect the surrounding environment, the health of operators, and the smooth progress of the cutting operation.

The hand sawing tool according to the present invention and the dust collecting device mounted thereto will be described in detail with reference to the accompanying drawings. As used herein, the term "up-down direction" (indicated by arrow UD in the drawings), the term "left-right direction" (indicated by arrow LR in the drawings), and the term "front-back direction" (indicated by arrow FB in the drawings) are directions defined with reference to an operator who grips and operates the hand saw tool. It should be noted, however, that the various relative orientation limitations described above are merely provided for the purpose of more intuitively conveying the concept of the present invention in connection with the accompanying drawings, and should not be construed as limiting the scope of the present invention in any way. For example, the up-down direction may also be referred to as a vertical direction, the left-right direction may also be referred to as a lateral direction, and the front-back direction may also be referred to as a longitudinal direction.

Referring to fig. 1, there is shown a chainsaw 100 as one embodiment of a hand sawing tool according to the present invention, the chainsaw 100 including a housing 110 having left and right side surfaces 111, 112 spaced apart along a left-right direction LR and upper and lower side surfaces 113, 114 (i.e., top and bottom) spaced apart along an up-down direction UD. The chainsaw 100 also includes a left side handle 120 disposed on the left side surface 111 of the housing 110 and an upper side handle 130 disposed on the upper side surface 113 of the housing 110. In operation, the operator can hold the left side handle 120 with his left hand and the upper side handle 130 with his right hand, and thus the operator is located primarily on the left side of the chainsaw 100 while operating the chainsaw 100. The chainsaw 100 further includes an output shaft 140 protruding from the right side surface 112 of the housing 110 and a drive wheel 150 fixed to the output shaft 140. the output shaft 140 may be coupled to a power unit (not shown) disposed inside the housing 110, whereby the power unit can drive the output shaft 140 to rotate, and the output shaft 140 will in turn drive the drive wheel 150 fixed thereto to rotate. The chainsaw 100 also includes a chain 160 coupled with the drive wheel 150 and a guide plate 170 secured to the right side surface 112 of the housing 110, wherein the chain 160 is slidably coupled to an edge of the guide plate 170 and the drive wheel 150 is configured to drive the chain 160 to slide along the edge of the guide plate 170. In this configuration, the drive wheel 150 and the guide plate 170 together define a generally endless travel path for the chain 160 that extends partially along the edge of the drive wheel 150 and partially along the edge of the guide plate 170. In the perspective of fig. 1, the drive wheel 150 moves the drive chain 160 in a clockwise direction through its path of travel. In other words, the driving wheel 150 is configured to drive the chain 160 such that the chain 160 moves forward and backward along the lower edge of the guide plate 170, as indicated by the arrow a. The chain 160 is configured to contact the material to be cut (e.g., autoclaved aerated concrete blocks) in a portion of its travel path that extends along the lower edge of the guide plate 170, thereby cutting the material with the blades fitted on the chain 160. In operation, the operator turns on the switch to move the chain 160 and holds the left hand grip 120 with his left hand and the upper side grip 130 with his right hand, and then presses the chain 160 toward the material being cut, which is cut as the blade contacts and moves through the path of movement. The cut material will be accelerated by the blade in its direction of movement when it is detached from the body of material, and will therefore move under the influence of inertia and its own weight, and in the orientation shown in fig. 1, will move obliquely downwards towards the chain 160, as indicated by arrow b. In the case where the material to be cut is a concrete block, pieces, particles, dust, etc. of the cut concrete will be splashed in the direction indicated by the arrow b.

In order to collect material that is splashed in the direction indicated by arrow b to avoid spreading of the material into the surrounding environment, the chainsaw 100 further comprises a dust collecting device 200 attached to the lower side surface 114 of the housing 110. Referring to fig. 4, there is shown a perspective view of a dust collecting apparatus 200 according to the present invention, the dust collecting apparatus 200 including a collecting portion 210, an abutting portion 220 spaced from the collecting portion 210 in a transverse direction, and a generally tubular conduit portion 230 connecting the collecting portion 210 to the abutting portion 220, wherein the collecting portion 210 defines an upwardly open receiving space 210s for receiving material (e.g., cut-off concrete pieces, particles, dust, etc.), the abutting portion 220 is adapted to abut with a suction device such as a vacuum cleaner and defines a discharge opening 220s therein for discharging material (see fig. 6), the discharge opening 220s is open at an end of the abutting portion 220, and an inner surface 231 of the conduit portion 230 defines a channel 230c extending in the transverse direction that fluidly communicates the receiving space 210s with the discharge opening 220s, thereby, the material received in the receiving space 210s may move to the discharge opening 220s through the passage 230 c. Alternatively, the docking portion 220 may also dock with a dust bag, with the collection function being accomplished by material inertia and internal wind flow. The outer surface 232 of the duct portion 230 is adapted to be attached to the lower side surface 114 of the housing 110 of the chainsaw 100 such that the collection portion 210 protrudes from the right side surface 112 of the housing 110, the receiving space 210s is positioned below the chain 160 (in particular, on a moving path of the material being cut off at a rated speed of the chain 160, i.e., a position offset downward and rearward with respect to the chain 160 as shown in fig. 1), and therefore the receiving space 210s is adapted to receive the material splashed off the chain 160, and the docking portion 220 protrudes from the left side surface 111 of the housing 110 such that the duct of the cleaner can be docked with the docking portion 220 at the left side of the housing 110. In this configuration, since the duct portion 230 extends from one side (hereinafter, referred to as a first side) to the other side (hereinafter, referred to as a second side) across the bottom of the case 110, it is possible to collect cut-off materials using the collecting portion 210 at the first side (illustrated as a right side in the drawing) where the cutting blade (illustrated as a chain 160 in the drawing) is provided, then transfer the materials from the first side to the second side (illustrated as a left side in the drawing) using the duct portion 230, and finally discharge the materials using the docking portion 220 at the second side, while the suction apparatus docking with the docking portion 220 at the second side is not interfered by the cutting blade provided at the first side, and thus it is possible to effectively collect and discharge the cut-off materials. More specifically, in operation, material splashed off the chain 160 will move into the receiving space 210s, the vacuum cleaner will, after activation, drive air to flow from the receiving space 210s to the discharge opening 220s through the passage 230c, and the air will carry material in the receiving space 210s to the discharge opening 220s through the passage 230c, which will then be discharged from the discharge opening 220s and into the vacuum cleaner's duct, whereby the cut material can be reliably and efficiently removed by the dust collection device 200, thereby avoiding diffusion of the material into the surrounding environment. It should be noted that the dust collecting device 200 does not need to be precisely positioned at a certain position, in other words, the position of the dust collecting device 200 can be changed within a certain range of positions without affecting the dust collecting effect of the dust collecting device 200, because the dust collector sucks air in the surrounding environment through the collecting part 210 after being docked with the docking part 220 and activated, and the air carries the materials into the collecting part 210, so that the collecting part 210 can effectively suck the materials splashed from the chain 160 as long as the dust collecting device 200 is positioned within a certain range of positions on the lower side surface 114 of the housing 110, that is, as long as the collecting part 210 is positioned within a certain range of positions below the chain 160, thereby reliably preventing the surrounding environment from being polluted by the materials. In addition, it is worth mentioning that in case the docking portion 220 is not docked with the vacuum cleaner, the dust collecting device 200 also functions to some extent to avoid the material from spreading into the surrounding environment, because the collecting portion 210 positioned below the chain 160 (in particular, positioned on the moving path of the cut-off material at the rated speed of the chain 160) can still collect the cut-off material into the receiving space 210s, and the collecting portion 210 can at least reduce the speed of the cut-off material to avoid it from spreading into the surrounding environment, and even after the receiving space 210s is filled, the material will only overflow from the receiving space 210s and fall onto the ground without spreading into the surrounding environment.

In an alternative embodiment of the utility model, as shown in fig. 4, the collecting section 210 comprises a bottom wall 211 extending in the transverse direction and a side wall 212 extending upwards from the edge of the bottom wall 211, wherein the bottom wall 211 and the side wall 212 together define said collecting opening 210s which is open towards the upper U. In particular, the bottom wall 211 extends along the extension direction of the channel 230c of the duct portion 230 and is flush with the inner surface 231 of the duct portion 230. In this configuration, the cut-off material collected by the bottom wall 211 can smoothly enter the passage 230c without any hindrance, thereby facilitating the removal of the cut-off material to avoid contamination thereof to the environment. In particular, the side wall 212 is connected at one end to the outer surface 232 of the duct portion 230 and at the other end is spaced from the outer surface 232 of the duct portion 230, so that said collection port 210s is also open towards the front F. The above-described configuration is advantageous in the case where the collecting portion 210 is positioned at a position offset downward and rearward with respect to the chain 160, because the collecting port 210s, which is open toward the front F and the upper U, can more effectively collect the materials splashed off from the chain 160, which can enter the collecting port 210s without any hindrance. Specifically, a portion of the side wall 212 extends rearward while extending upward from the edge of the bottom wall 211, that is, extends obliquely upward and rearward from the edge of the bottom wall 211. The above arrangement is also advantageous in case the collecting section 210 is positioned in a downwardly and rearwardly offset position with respect to the chain 160, since the obliquely extending portion of the side wall 212 increases the area of the side wall 212 in contact with the material, which larger contact area enables the collecting section 210 to collect the material more effectively.

In an alternative embodiment of the present invention, as shown in fig. 5, which shows a perspective view of the dust collecting apparatus 200 according to the present invention, the docking portion 220 is provided at an end thereof with a generally ring-shaped (e.g., circular ring-shaped) docking structure 221, the docking structure 221 being adapted to dock with a pipe of a vacuum cleaner so that the vacuum cleaner can suck materials in the discharge port 220s to remove the materials, and further, the ring-shaped shape of the docking structure 221 allows an operator to conveniently dock the docking portion 220 with a standard pipe of a general vacuum cleaner, so that a dedicated pipe does not need to be prepared for the docking portion 220. In particular, the docking structure 221 is provided on an inner surface thereof with a plurality of ribs 222, the plurality of ribs 222 extending in an axial direction (i.e., a left-right direction, a lateral direction) and being spaced apart from each other in a circumferential direction. These ribs 222 can help position and secure the duct of the cleaner to the docking structure 221 to prevent the duct of the cleaner from disengaging the docking structure 221 due to movement or vibration of the chainsaw 100.

In an alternative embodiment of the present invention, as shown in fig. 6, which shows a cross-sectional view of a dust collecting apparatus 200 according to the present invention, the cross-sectional area (i.e., flow area) of the discharge port 220s is larger than the cross-sectional area of the passage 230 c. In this configuration, the flow rate of gas in channel 230c will be higher than the flow rate of gas in discharge port 220s, and the pressure of gas in channel 230c will be lower than the pressure of gas in discharge port 220s according to bernoulli's principle, which can increase the vacuum in collection port 210s, thereby increasing the suction of ambient air by collection port 210s to enable collection port 210s to more efficiently collect material.

In an alternative embodiment of the utility model, as shown in fig. 4-6, the duct portion 230 is provided with a positioning structure, such as a pair of catches 233, on an outer surface 232 thereof, the pair of catches 233 being adapted to snap into corresponding slots provided in the housing 110 of the chainsaw 100 in order to removably attach the dust collecting device 200 to the housing 110 of the chainsaw 100. As shown in fig. 2 and 3, which respectively show a side view and a perspective view of the chainsaw 100 without the dust collection device 200 mounted thereto, the catch is composed of, for example, a left catch 115 (shown in fig. 3) provided in the left side surface 111 of the housing 110 and a right catch 116 (shown in fig. 2) provided in the right side surface 112 of the housing 110. In this configuration, an operator can easily attach the dust collection apparatus 200 to the housing 110 of the chainsaw 100, and can easily detach the dust collection apparatus 200 from the housing 110. However, it should be noted that the above-mentioned snap-fit manner is merely exemplary and not restrictive, and the dust collection device 200 may be mounted on the housing 110 of the chainsaw 100 by other positioning structures (e.g., screws, adhesives, magnets, magic tapes, etc.). Alternatively, the dust collection device 200 may be directly molded to the housing 110 of the chainsaw 100.

In an alternative embodiment of the present invention, as shown in FIGS. 1-3, the housing 110 of the chainsaw 100 is provided with a recess 117 in its underside surface 114 for at least partially receiving the conduit portion 230 of the dust collection apparatus 200. In particular, the groove 117 is matched in shape to the pipe portion 230, so that the pipe portion 230 can be reliably and stably accommodated in the groove 117. With this configuration, the duct portion 230 does not entirely protrude from the lower side surface 114 of the housing 110 due to the presence of the groove 117, which avoids a situation in which the height of the chainsaw 100 is significantly increased after the dust collection apparatus 200 is assembled, and the dust collection apparatus 200 can be reliably positioned. In particular, the bottom (i.e., the lower surface) of the dust collection device 200 is flush with the bottom (i.e., the lower surface 114) of the housing 110. In this configuration, the chainsaw 100 equipped with the dust collection device 200 can still rest smoothly on a support such as an operation table and has a pleasant appearance.

In an alternative embodiment of the present invention, as shown in fig. 1, the chainsaw 100 further comprises a lock cover 180, the lock cover 180 being attached to the housing 110 on the right side of the housing 110 such that the drive wheel 150 and the chain 160 and guide plate 170 in the vicinity thereof are located between the housing 110 and the lock cover 180 in the lateral direction. In this configuration, the housing 110 and the locking cover 180 define a restriction space therebetween, which is a part of the operation area of the cutting tool, communicating with the collection port 210s defined by the collection portion 210 of the dust collection device 200 and having a limited lateral width, whereby negative pressure can be more effectively established in the collection port 210s, and negative pressure can be formed in the entire restriction space due to the negative pressure in the collection port 210s, so that surrounding material can be sucked using the entire restriction space, which greatly improves the efficiency of collecting the material. Further, the chain 160 is partially received in the restriction space such that the moving path of the chain 160 extends into the restriction space. In particular, the chain 160 is intended to contact and cut the material along a portion of its movement path (hereinafter referred to as the active portion), which extends into the constraint space after the active portion. In this configuration, the chain 160 enters into the confined space after passing through the action portion of the moving path (i.e., cutting the material), whereby the material cut and taken away by the chain 160 can be confined in the confined space, thereby preventing the material from spreading, which can further improve the efficiency and reliability of collecting the material using the collecting portion 210. In particular, the collecting portion 210 is also positioned in the confined space. In addition, it is worth mentioning that since the duct portion 230 extends from the right side to the left side across the bottom of the housing 110, the air suction device that is docked with the docking portion 220 on the left side is free from interfering with not only the chain 160, the guide tray 170, and the like on the right side, but also the lock cover 180 on the right side.

Although the above describes the embodiment in which the dust collection apparatus 200 is mounted on the chainsaw 100, it is apparent that the dust collection apparatus according to the present invention is not only applicable to chainsaws, but also to other hand sawing tools (e.g., angle grinders, circular saws, etc.); in addition, the above embodiments describe the structure in which the cutting tool is disposed on the first side of the housing, and the cutting tool does not mean that the cutting tool is strictly disposed on the first side, but means that the cutting tool is disposed from the center line of the housing toward the first side; it is also understood that other portions, such as collecting portion 210, are provided on a first side of the housing and docking portion 220 is provided on a second side of the housing; as long as the collecting portion 210 of the dust collecting device 200 is positioned below the cutting blade of the hand sawing tool for contacting and cutting the material, the material cut by the cutting blade can be collected, thereby preventing the material from spreading into the surrounding environment and thus protecting the surrounding environment and the health of the operator. It is emphasized that the cutting tool described herein is not specifically referred to as being directly below, but also includes being located behind and below, etc., taking into account other factors such as the inertia of the material moving, the air flow influence of the cutting tool's travel area, the handcutting tool's holding habits, etc., so long as the location is located to facilitate the collection and collection of the material.

Alternative but non-limiting embodiments of a dust collecting device and a hand sawing tool according to the utility model are described in detail above with the aid of the figures. Modifications and additions to the techniques and structures, as well as re-combinations of features in various embodiments, which do not depart from the spirit and substance of the disclosure, will be readily apparent to those of ordinary skill in the art as they are deemed to be within the scope of the utility model. Accordingly, such modifications and additions that can be envisaged within the teachings of the present invention are to be considered as part of the present invention. The scope of the present invention includes equivalents known at the time of filing and equivalents not yet foreseen.

Claims (10)

1. Dust collection device (200) for being disposed at a bottom of a housing of a hand sawing tool, comprising:

a collecting portion (210), the collecting portion (210) defining a collecting opening (210s) facing a running area of a cutting tool of the hand sawing tool;

a docking portion (220) spaced apart from the collecting portion (210), the docking portion (220) defining a discharge opening (220s) open at an end thereof; and

a duct portion (230) connecting the collecting portion (210) with the docking portion (220), an inner surface (231) of the duct portion (230) defining a channel (230c), the channel (230c) communicating the collecting port (210s) with the discharge port (220 s).

2. The dust collecting apparatus (200) of claim 1, wherein the docking portion (220) is adapted to dock at its end with a suction device or a dust bag.

3. The dust collecting device (200) according to claim 1 or 2, wherein the collecting section (210) comprises a bottom wall (211) and a side wall (212) extending upwardly from an edge of the bottom wall (211), the bottom wall (211) and the side wall (212) together defining the collecting opening (210 s).

4. The dust collecting device (200) of claim 3,

the side wall (212) being connected at one end to an outer surface (232) of the duct portion (230) and spaced apart at the other end from the duct portion (230) such that the collection port (210s) also faces forward; and/or the presence of a gas in the gas,

a portion of the sidewall (212) extends rearward while extending upward; and/or the presence of a gas in the gas,

the bottom wall (211) is flush with an inner surface (231) of the pipe portion (230).

5. A hand sawing tool comprising:

a housing having a first side and a second side spaced apart from each other;

cutting tool arranged at a first side of the housing, characterized in that the hand sawing tool further comprises a dust collecting device (200) according to any of claims 1-4, wherein the pipe section (230) is located at the bottom of the housing, the collecting section (210) is arranged at the first side of the housing, the collecting opening (210s) faces the running area of the cutting tool, and the docking section (220) is arranged at the second side of the housing.

6. Hand sawing tool according to claim 5, characterised in that the dust collecting device (200) is formed in the housing; alternatively, the dust collecting device (200) is attached to the bottom of the housing.

7. Hand sawing tool according to claim 5, characterized in that the bottom of the dust collecting device (200) is flush with the bottom of the housing.

8. The hand sawing tool according to claim 5, further comprising a drive wheel (150) and a locking cover (180) attached to a first side of the housing and housing the drive wheel (150), the cutting tool outputting motion through the drive wheel (150), the housing (110) and the locking cover (180) defining a confined space therebetween communicating an operating area of the cutting tool with the collection port (210 s).

9. The hand sawing tool according to claim 5, characterized in that the cutting tool is configured to contact and cut material along a portion of its movement path, referred to as active portion, further comprising a locking cover (180) attached to the first side of the housing, a confined space being defined between the locking cover and the housing, the confined space communicating with the collection port (210s), and the movement path of the cutting tool extending into the confined space behind the active portion.

10. Hand sawing tool according to any one of claims 5 to 9, characterised in that the hand sawing tool is a chainsaw (100) for cutting autoclaved aerated concrete.

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