Dust and / or chip evacuation device and hand-held power tool

Abstract

The invention relates to a dust and / or chip extraction device for a hand-held power tool having a saw blade which is rotatable about a saw blade axis, comprising an upper saw blade guard which is designed to cover a portion of a saw blade region accommodating the saw blade which faces away from a workpiece machining region, and a lower saw blade guard which is movably supported relative to the upper saw blade guard and is designed to cover a portion of the saw blade region which faces towards the workpiece machining region in a rest state and to uncover the portion of the saw blade region which faces towards the workpiece machining region at least in a sawing operation in which the saw blade is sunk into the workpiece, the lower saw blade guard having a dust and / or chip extraction opening through which the dust and / or chips generated can be extracted from the saw blade region, and a flow-orienting unit which is designed to deflect the dust and / or chip particles passing through the dust and / or chip extraction opening in a targeted manner from a radial direction perpendicular to the saw blade axis.

Description

Technical Field

[0001] This invention relates to a dust and / or chip removal device and a handheld machine tool. Background Technology

[0002] A dust and / or chip removal device for a handheld machine tool has been proposed, the handheld machine tool having a saw blade that generates dust and / or chips and is rotatable about a saw blade axis. The dust and / or chip removal device includes an upper saw blade guard configured to at least substantially and permanently cover the portion of the saw blade area of ​​the handheld machine tool that houses the saw blade away from the workpiece machining area, and has a lower saw blade guard movably supported relative to the upper saw blade guard, the lower saw blade guard configured to at least substantially cover the portion of the saw blade area facing the workpiece machining area in a stationary state, and to at least partially expose the portion of the saw blade area facing the workpiece machining area by retracting at least partially into the upper saw blade guard during sawing operations where the saw blade is submerged in the workpiece. The lower saw blade guard has at least one dust and / or chip removal opening through which dust and / or chips generated by the rotating saw blade can be removed from the saw blade area. Known dust and / or chip outlets are elongated holes extending circumferentially or transversely to the lower saw blade guard. These only allow dust or chip particles to pass through the lower saw blade guard without targeted flow guidance or shaping. Particles can escape from the saw blade area, particularly perpendicular to the circumferential direction, potentially creating undesirable eddies in the intermediate space between the lower and upper saw blade guards. Consequently, a significant amount of particles does not migrate to the suction nozzle or collection container of the upper saw blade guard but escapes from the upper saw blade guard into the environment at other locations. Summary of the Invention

[0003] This invention relates to a dust and / or chip removal device for a handheld machine tool, the handheld machine tool having a saw blade that generates dust and / or chips and is rotatable about a saw blade axis. The dust and / or chip removal device has an upper saw blade protector preferably fixed in position, configured to at least substantially and permanently cover the portion of the saw blade area of ​​the handheld machine tool facing away from the workpiece machining area, and has a lower saw blade protector movably supported relative to the upper saw blade protector, particularly rotatably supported about the saw blade axis. The lower saw blade protector is configured to, in a stationary state, at least substantially... The lower saw blade guard has at least one dust and / or chip outlet, through which dust and / or chips generated by the rotating saw blade can be discharged from the saw blade area, particularly into the cavity of the upper tool guard, when the hand-held machine tool is generating dust and / or chips. Advantageously, this prevents or at least reduces the generation of eddies in the airflow containing dust or chips within the hand-held machine tool compared to the prior art. This particularly reduces the amount of dust or chip-containing airflow escaping between the sidewalls of the upper and lower saw blade guards in the direction of the saw blade axis.

[0004] The present invention proposes that the dust and / or chip discharge device, particularly the dust and / or chip discharge opening, has a flow orientation unit configured to at least purposefully deflect dust and / or chip particles passing through the dust and / or chip discharge opening from a radial direction perpendicular to the saw blade axis. This advantageously allows for flow shaping, particularly guiding a larger proportion of dust or chip particles to the dust and / or chip container and / or attachment interface for a vacuum cleaner hose in the upper saw blade guard. Advantageously, the proportion and quantity of dust or chip particles escaping from the handheld machine tool can be reduced and / or kept to a minimum, thereby reducing the health burden on the handheld machine tool user. Advantageously, the "Dust-Capture-Rate" can be improved compared to the prior art.

[0005] The dust and / or chip removal device is particularly a component / part of the handheld machine tool. Preferably, the dust and / or chip removal device is configured to specifically guide and / or direct dust or chip particles generated during workpiece machining by the handheld machine tool. Preferably, the handheld machine tool is a handheld circular saw. In particular, the handheld machine tool is a cordless, preferably battery-operated, handheld circular saw. A cordless handheld circular saw preferably collects dust and chips in a dust bag or dust box rather than being attached to an external vacuum cleaner, as an external vacuum cleaner would impair the mobility gained through the cordless connection. Therefore, for a cordless handheld circular saw, the flow guidance of exhaust containing dust or chip particles is more important, since there is no support or external flow guidance provided by the suction of an external vacuum cleaner. The saw blade of the handheld machine tool can rotate about a fixed saw blade axis. The handheld machine tool has a saw blade area configured to replaceably accommodate the saw blade. The saw blade is preferably a circular saw blade with teeth on its outer circumference. The saw blade can be configured, for example, for machining wooden workpieces. However, it can also saw other types of materials. Depending on the workpiece being sawn, dust or chips may be generated differently. "Configured" should be understood in particular as specifically programmed, designed, and / or equipped. "Object configured for a specific function" should be understood in particular as the object satisfying and / or implementing that specific function in at least one application and / or operating state.

[0006] The upper saw blade protector is particularly constructed as an upper saw blade cover. The upper saw blade protector preferably has a generally semi-disc-shaped internal space (hereinafter also referred to as the cavity of the upper saw blade protector) configured to completely surround a portion of the saw blade. The upper saw blade protector preferably prevents access to the saw blade from above. The upper saw blade protector is preferably fixedly arranged relative to the drive unit of the handheld machine tool, the battery of the handheld machine tool, and / or the main handle position of the handheld machine tool. "Mostly" should be understood in particular as 51%, preferably 60%, and especially preferably 70%. The workpiece processing area of ​​the handheld machine tool, particularly the area where the workpiece can be positioned during the intended processing by the saw blade, is the area of ​​the handheld machine tool. In particular, the upper saw blade protector is configured to at least substantially and permanently cover the upper part of the saw blade area of ​​the handheld machine tool and the saw blade mounted therein. The upper saw blade protector is permanently arranged on the same side of the saw table of the handheld circular saw, particularly on the upper side.

[0007] The lower saw blade protector is particularly constructed as a lower saw blade cover. The lower saw blade protector preferably has a partially disc-shaped, especially slightly smaller than a semi-disc-shaped, internal space configured to completely surround a portion of the saw blade. The lower saw blade protector preferably prevents access to the saw blade from below when the handheld circular saw is stationary. When the handheld circular saw is stationary, the lower saw blade protector is positioned on the side of the saw table opposite the upper saw blade protector. During sawing operations, the lower saw blade protector is positioned on the same side of the saw table as the upper saw blade protector. The lower saw blade protector may have a handle that allows the lower saw blade protector to be moved / twisted relative to the upper saw blade protector before contact with the workpiece. Alternatively, it is conceivable that the lower saw blade protector automatically avoids / moves when the workpiece is being processed. In particular, during the movement of the lower saw blade protector, at least one outer periphery of the lower saw blade protector moves on a circular track centered around the saw blade axis of the handheld machine tool / saw blade. Preferably, during displacement, all points on the lower saw blade guard move along a circular track around the saw blade axis. In particular, during sawing operations, the lower saw blade guard exposes the entire area of ​​the saw blade protruding below the saw table.

[0008] Preferably, the lower saw blade guard is adapted into the internal space of the upper saw blade guard (between the saw blade area and the outer wall of the upper saw blade guard). Preferably, during sawing operation, the upper saw blade guard largely overlaps with the lower saw blade guard. In particular, when the lower saw blade guard retracts into the upper saw blade guard, the lower saw blade guard rotates into the stationary upper saw blade guard. In particular, when retracted into the upper saw blade guard, the lower saw blade guard slides between the saw blade and the outer wall of the upper saw blade guard. In particular, the lower saw blade guard retracted into the upper saw blade guard divides the space between the saw blade and the outer wall of the upper saw blade guard into two parts, particularly a part radially facing the saw blade and a part radially away from the saw blade. These two parts are preferably connected to each other through a dust and / or chip outlet. The dust and / or chip outlet allows air and dust or chips to exchange between the two parts. In particular, dust or chip particles generated by the rotating saw blade can be transferred / conveyed / exported from the saw blade area through a dust and / or chip outlet into the intermediate space between the retracted lower saw blade guard and the upper saw blade guard, preferably between the radially outer surface of the lower saw blade guard and the radially inner surface of the upper saw blade guard. Specifically, the dust and / or chip outlet differs from an elongated hole extending circumferentially along the radially outer side of the lower saw blade guard. Furthermore, the dust and / or chip outlet differs from a purely radially extending, unobstructed hole.

[0009] The flow orientation unit is preferably constructed integrally with, and in particular, as a single unit, the lower saw blade guard. The flow orientation unit is preferably constructed via, or partially via, the lower saw blade guard.

[0010] Furthermore, it is proposed that the flow orientation unit is configured to deflect dust and / or chip particles passing through the dust and / or chip outlet opening at least in a lateral direction that extends at an angle relative to the saw blade plane of the saw blade area. This allows for an advantageous flow orientation. Advantageously, the vortex within the intermediate space between the lower and upper saw blade guards can be oriented inward (opposite to the outward direction when the airflow can simply leave the dust and / or chip outlet opening in the radial direction). In particular, the particulate-laden airflow escaping through the dust and / or chip outlet opening, constructed in this way, obliquely impacts the inner wall of the upper saw blade guard and is then obliquely reflected upward by this inner wall, such that the reflected airflow is then deflected from the radial inner wall toward the center of the saw blade guard. Specifically, the airflow is generated by the rotating saw blade and is radially compressed outward due to centrifugal force, i.e., toward the inner side of the retracted lower saw blade guard and / or through the dust and / or chip outlet opening of the lower saw blade guard. The lateral direction is at an angle relative to the radial direction / saw blade plane, ranging from 20° to 70°, preferably from 30° to 60°, even more preferably from 40° to 50°, and particularly preferably from about 45°.

[0011] If the lower saw blade guard has at least one additional dust and / or chip venting opening, arranged adjacent to the existing dust and / or chip venting opening in a direction extending parallel to the saw blade axis, the removal of dust or chip particles can be advantageously improved. Advantageously, particularly numerous / preferably almost all dust or chip particles can be vented from the saw blade area.

[0012] Furthermore, a particularly advantageous flow orientation can be achieved if the flow orientation unit is configured to deflect dust and / or chip particles passing through the additional dust and / or chip outlet openings at least in another lateral direction, which extends at an angle opposite to the saw blade plane relative to the saw blade region compared to the lateral direction. Advantageously, mutual tumbling of airflows containing dust or chip particles escaping from the dust and / or chip outlet openings and the additional dust and / or chip outlet openings can be achieved. Advantageously, airflows containing dust or chip particles escaping between the sidewalls of the upper and lower saw blade guards in the saw blade axial direction can be reduced in particular. Preferably, the deflection direction of the airflows escaping from the dust and / or chip outlet openings and the additional dust and / or chip outlet openings is mirror-symmetrical with respect to the saw blade plane. Preferably, the flow orientation element of the flow orientation unit associated with the two dust and / or chip outlets is mirror-symmetrical with respect to the saw blade plane.

[0013] Furthermore, it is proposed that a recess is arranged on the radially outer side of the lower saw blade guard, between the dust and / or chip outlet and other dust and / or chip outlets, which in particular constitutes a vortex recess. This allows for a particularly advantageous flow orientation. Advantageously, the mutual tumbling of airflow containing dust or chip particles escaping from the dust and / or chip outlet and other dust and / or chip outlets can be optimized. The recess preferably has a symmetrical, schalenform shape in a cross-sectional view. The recess extends in the circumferential direction, particularly by at least the same extent as the dust and / or chip outlet, preferably by at least the same extent as all the dust and / or chip outlets of the lower saw blade guard combined.

[0014] Furthermore, it is proposed that the flow orientation unit is configured to deflect dust and / or chip particles passing through the dust and / or chip outlet opening, particularly by or in place of lateral deflection, at least in one direction, particularly outwardly pointing, parallel to the saw blade plane of the saw blade area and extending at an angle relative to the radial direction. This allows for particularly advantageous flow guidance, specifically oriented towards the attachment interface for the dust and / or chip container and / or the vacuum cleaner hose. In particular, the deflection direction, parallel to the saw blade plane of the saw blade area and extending at an angle relative to the radial direction, is at least partially directed towards / towards the attachment interface for the dust and / or chip container and / or the vacuum cleaner hose constructed by the upper saw blade guard. Advantageously, with flow oriented only as described above, airflow carrying dust or chip particles can flow into the intermediate space between the two saw blade guards as laminarly as possible. Advantageously, turbulence can be avoided.

[0015] Here, if the flow direction unit deflects dust and / or chip particles passing through the dust and / or chip outlet in a direction, especially outward, different from the tangential direction of the saw blade / saw blade area, then at least undesirable types of eddies can be advantageously avoided or reduced. Advantageously, high-level airflow can be achieved. Advantageously, optimal airflow orientation, especially towards the attachment interface, can be achieved.

[0016] Here, if the angle between the tangential direction of the saw blade / saw blade area and the direction in which the dust and / or chip particles passing through the dust and / or chip outlet are deflected by the flow orientation unit, especially the outward direction, is less than 60°, preferably less than 45°, the aforementioned advantage of deflection from the tangential direction can be further optimized.

[0017] Additionally, the lower saw blade guard has at least one additional dust and / or chip venting opening, which is arranged in a direction surrounding the saw blade area externally, either in front of or behind the dust and / or chip venting opening. This advantageously improves the venting of dust or chip particles. Advantageously, particularly many / preferably almost all dust or chip particles can be vented from the saw blade area. Advantageously, the flow velocity through the dust and / or chip venting opening can be reduced, thereby particularly improving the laminar flow characteristics of the airflow. Preferably, the dust and / or chip venting device has multiple additional dust and / or chip venting openings, such as two, three, four, or more than four additional dust and / or chip venting openings. For larger saw blade areas and larger saw blades, a greater number of additional dust and / or chip vents may be meaningful compared to for smaller saw blade areas and smaller saw blades. These additional dust and / or chip vents can be arranged directly behind the existing dust and / or chip vent, or laterally offset relative to it. Preferably, the additional dust and / or chip vents are constructed identically to the existing dust and / or chip vent. However, alternatively, different vent shapes and / or sizes are also conceivable.

[0018] Additionally, with the lower saw blade guard maximally retracted into the upper saw blade guard, the dust and / or chip outlet and additional dust and / or chip outlets are respectively opposed to the inner walls of the upper saw blade guard at different distances. This advantageously allows for stable flow / stable flow establishment. Advantageously, it avoids the unnecessary acceleration of flowing air carrying particles or its lateral downward pressure between the two saw blade guards. The different distances between the front and rear dust and / or chip outlets and their corresponding opposing inner walls of the upper saw blade guard can be achieved through a corresponding design of the outermost outer wall of the upper saw blade guard or by introducing an intermediate wall inside the upper saw blade guard. In particular, the distance between the inner walls of the upper saw blade guard opposing the dust and / or chip outlets arranged closer to the attachment interface is greater than the distance between the inner walls of the upper saw blade guard opposing the dust and / or chip outlets arranged farther from the attachment interface. Therefore, air escaping from the closer dust and / or chip outlet can be added to the air already flowing toward the attachment interface without significantly increasing the flow velocity.

[0019] Furthermore, it is proposed that the dust and / or chip outlet can be partially or completely arranged on the axial side of the lower saw blade guard. This advantageously maintains a low flow velocity in the intermediate space between the saw blade guards, which particularly supports / promotes laminar flow. Additionally or alternatively, the dust and / or chip outlet can be at least partially or completely arranged on the radially outer side of the lower saw blade guard. In particular, the dust and / or chip outlet can extend from one side of the lower saw blade guard radially outer to the side of the lower saw blade guard opposite to that side. However, it is also conceivable that the dust and / or chip outlet is arranged only on the radially outer side of the lower saw blade guard or only on one of the two sides of the lower saw blade guard.

[0020] If the flow orientation unit is formed at least partially by a channel extending obliquely through the wall, especially the side wall or radial outer wall, of the lower saw blade guard, simple and / or reliable flow guidance can be advantageously achieved. Advantageously, a compact implementation of the flow orientation unit can be achieved. The channel extending obliquely through the wall preferably does not extend parallel to the radial direction. The channel extending obliquely through the wall can extend relative to the radial direction at an angle (especially different from 0° and 90°) within the saw blade plane, specifically the angle between the aforementioned tangential direction of the saw blade / saw blade region and the direction to which the flow orientation unit deflects dust and / or chip particles passing through the dust and / or chip outlet. Alternatively or additionally, the channel extending obliquely through the wall can extend at an angle open relative to the saw blade plane (especially different from 0° and 90°). This channel particularly constitutes the flow orientation element of the flow orientation unit.

[0021] Instead of or attached to a channel extending obliquely through the wall, the flow orientation unit is constructed at least partially by tabs / spoilers that protrude at least partially externally from the dust and / or chip outlet openings. This advantageously allows for a simple construction of the flow orientation unit. Advantageously, it enables the simple setting of the deflection angle. The tabs can be laterally open or laterally closed. The tabs particularly constitute the flow orientation elements of the flow orientation unit. Multiple front-to-back dust and / or chip outlet openings equipped with tabs particularly constitute a gill-like structure of the flow orientation unit.

[0022] Furthermore, it is proposed that the upper saw blade guard has attachment interfaces for a dust and / or chip container and / or for a vacuum cleaner hose. This advantageously allows for the collection or removal of dust or chip particles. Advantageously, it improves health protection for users of handheld machine tools equipped with dust and / or chip removal devices.

[0023] Furthermore, a handheld machine tool, particularly a handheld circular saw, is proposed. This handheld machine tool has a saw blade area into which a saw blade can be fitted, allowing the workpiece arranged in the workpiece processing area of ​​the handheld machine tool to be processed by means of the saw blade. The handheld machine tool has a drive unit for generating rotation of the saw blade arranged in the saw blade area about the saw blade axis of the drive unit, and the handheld machine tool also has the aforementioned dust and / or chip removal device. Advantageously, the proportion and amount of dust or chip particles escaping from the handheld machine tool can be reduced and / or kept to a minimum, thereby reducing the health burden on the user of the handheld machine tool. Advantageously, the dust capture rate of the handheld machine tool can be optimized.

[0024] Here, the dust and / or chip removal device according to the invention and / or the handheld machine tool according to the invention should not be limited to the applications and embodiments described above. In particular, the dust and / or chip removal device according to the invention and / or the handheld machine tool according to the invention may have a different number than the various elements, components, and units mentioned herein in order to achieve the functional mode described herein. Furthermore, the numerical ranges given in this disclosure should also be considered as values ​​within the stated limits, which are also public and can be used arbitrarily. Attached Figure Description

[0025] Other advantages arise from the following description of the accompanying drawings. Four embodiments of the invention are illustrated in the drawings. The drawings and description contain numerous combinations of features. Those skilled in the art will also appropriately consider these features individually and summarize them into other meaningful combinations.

[0026] The attached diagram shows: Figure 1 A schematic side view of a handheld machine tool with a dust and / or chip removal device in a stationary state is shown. Figure 2 A schematic cross-sectional view of a handheld machine tool with a dust and / or chip removal device during sawing operation is shown. Figure 3 A portion of the cross-section of the lower saw blade guard of the dust and / or chip removal device is schematically shown. Figure 4 A schematic perspective view of the lower saw blade guard of an alternative dust and / or chip removal device is shown. Figure 5 A schematic cross-sectional view showing the portion passing through the second alternative dust and / or chip removal device, and Figure 6 A schematic cross-sectional view showing the portion passing through the third alternative dust and / or chip removal device. Detailed Implementation

[0027] Figure 1A schematic side view of a handheld power tool 10a is shown. The handheld power tool 10a is configured as a handheld circular saw. The handheld power tool 10a is configured as a cordless type. The handheld power tool 10a has a rechargeable battery 74a. The rechargeable battery 74a is configured to supply electrical drive power to the handheld power tool 10a. The handheld power tool 10a has a main handle 78a. The handheld power tool 10a has a housing 80a. The housing 80a is integrally constructed with the main handle 78a. The handheld power tool 10a has a drive unit 70a. The drive unit 70a includes an electric motor (not shown) fed by the rechargeable battery 74a and enclosed in the housing 80a. The drive unit 70a includes a saw blade shaft. The drive unit 70a is configured to rotate the saw blade shaft. The handheld power tool 10a has a saw blade region 22a. A saw blade 14a can be fitted into the saw blade region 22a. Figure 1 In the illustrated embodiment, the saw blade 14a is mounted in the saw blade region 22a. The saw blade 14a is mounted in the saw blade region 22a such that the saw blade 14a, driven by the drive unit 70a via the saw blade shaft, can process the workpiece 28a (see...) arranged in the workpiece processing region 18a of the handheld machine tool 10a. Figure 2 The saw blade 14a is rotatably fixed in the handheld machine tool 10a about the saw blade axis 12a. The saw blade 14a generates dust and / or chips during sawing operation 86a. The handheld machine tool 10a has a workpiece processing area 18a. The handheld machine tool 10a has a saw table 76a. The workpiece processing area 18a is completely arranged on one side of the saw table 76a. The workpiece processing area 18a is completely arranged on the side opposite to the drive unit 70a and / or the battery 74a. The workpiece processing area 18a is completely arranged below the saw table 76a. A dust and / or chip container 82a is mounted on the handheld machine tool 10a. The dust and / or chip container 82a is configured to collect and contain dust or chip particles generated during the processing of the workpiece 28a. The dust and / or chip container 82a is exemplary constructed as a bag. The dust and / or chip container 82a is replaceable.

[0028] The handheld machine tool 10a has a dust and / or chip removal device 72a. The dust and / or chip removal device 72a has an upper saw blade protector 16a. The upper saw blade protector 16a is fixedly arranged / fixed in the handheld machine tool 10a. The upper saw blade protector 16a is configured to permanently cover the portion 20a of the saw blade area 22a that is opposite to the workpiece machining area 18a, which houses the saw blade 14a, and thus also permanently cover the corresponding portion of the mounted saw blade 14a. The upper saw blade protector 16a has an attachment interface 68a for a dust and / or chip container 82a. Alternatively or additionally, it is conceivable that the attachment interface 68a can accommodate the attachment of a vacuum cleaner hose. The saw table 76a is fixed / mounted to the upper saw blade protector 16a.

[0029] The dust and / or chip removal device 72a has a lower saw blade guard 24a. The lower saw blade guard 24a is movably supported relative to the upper saw blade guard 16a. The lower saw blade guard 24a is rotatably supported about the saw blade axis 12a. The lower saw blade guard 24a is configured for, at least in (especially) Figure 1 In the stationary state 84a of the handheld machine tool 10a (as shown), the saw blade area 22a at least substantially covers the portion 26a of the workpiece machining area 18a facing the workpiece, and therefore also at least substantially covers the corresponding portion of the assembled saw blade 14a. The lower saw blade guard 24a is configured for, at least in (especially...) Figure 2 In the sawing operation 86a shown, when the saw blade 14a is submerged in the workpiece 28a, the portion 26a of the saw blade area 22a facing the workpiece machining area 18a is at least partially exposed by retracting at least partially into the upper saw blade guard 16a. The lower saw blade guard 24a has an operating lever 88a. The operating lever 88a allows the user of the handheld machine tool 10a to manually retract the lower saw blade guard 24a into the upper saw blade guard 16a. The operating lever 88a allows the user of the handheld machine tool 10a to manually rotate the lower saw blade guard 24a. The lower saw blade guard 24a has a dust and / or chip outlet 30a. The lower saw blade guard 24a has an additional dust and / or chip outlet 60a. An additional dust and / or chip outlet 60a is arranged in front of the dust and / or chip outlet 30a in a direction 52a surrounding the saw blade area 22a on the outside. Figure 1 and Figure 2 In the illustrated embodiment, a second additional dust and / or chip outlet 90a is also provided. Alternatively, more or fewer than two additional dust and / or chip outlets 60a and 90a may be provided. The dust and / or chip outlets 30a, 60a, and 90a are partially arranged on the side surface 58a / sidewall of the lower saw blade guard 24a, particularly axially relative to the saw blade axis 12a. The dust and / or chip outlets 30a, 60a, and 90a are partially arranged on the radially outer side 44a of the lower saw blade guard 24a. Alternatively, the dust and / or chip outlets 30a, 60a, and 90a may also be arranged only on the radially outer side 44a of the lower saw blade guard 24a.

[0030] Figure 2A schematic cross-sectional view of a handheld machine tool 10a with a dust and / or chip removal device 72a is shown during a sawing operation 86a, in which the saw blade 14a is submerged in the workpiece 28a. A lower saw blade guard 24a is retracted into an upper saw blade guard 16a. The lower saw blade guard 24a is arranged inside the upper saw blade guard 16a. The rotating saw blade 14a generates an airflow 94a. The airflow 94a includes dust or chip particles (not shown) from the workpiece 28a. The airflow 94a is to be guided to an attachment interface 68a by means of the dust and / or chip removal device 72a. Dust and / or chip removal openings 30a, 60a, and 90a are configured to remove dust and / or chips generated by the rotating saw blade 14a from the saw blade area 22a. Dust and / or chip outlets 30a, 60a, and 90a are configured to direct dust and / or chips generated by the rotating saw blade 14a from the saw blade area 22a into an intermediate space 96a between the inner wall of the upper saw blade guard 16a and the outer wall of the lower saw blade guard 24a. Figure 2 With the lower saw blade guard 24a retracted to the maximum extent into the upper saw blade guard 16a, the dust and / or chip outlet openings 30a, 60a, and 90a are spaced apart from the inner wall regions 54a and 56a that are directly radially opposite to the upper saw blade guard 16a at different distances.

[0031] The dust and / or chip discharge device 72a has a flow orientation unit 32a. The flow orientation unit 32a is configured to at least deflect dust and / or chip particles passing through the dust and / or chip discharge openings 30a, 60a, 90a in a radial direction 34a perpendicular to the saw blade axis 12a in the saw blade region 22a. Figure 3A cross-section through a portion of the lower saw blade guard 24a is schematically shown. The flow orientation unit 32a has a flow orientation element 98a. The flow orientation element 98a is formed by a channel 64a extending obliquely through the wall 62a of the lower saw blade guard 24a. The flow orientation unit 32a, and in particular the associated flow orientation element 98a, is configured to deflect dust and / or chip particles passing through the dust and / or chip outlet openings 30a, 60a, 90a, or the airflow 94a containing dust and / or chip particles passing through the dust and / or chip outlet openings 30a, 60a, 90a, onto an outwardly pointing direction 48a, which is parallel to the saw blade plane 38a of the saw blade region 22a and extends at an angle relative to the radial direction 34a. The outward pointing direction 48a differs from the tangential direction 50a of the saw blade 14a and / or saw blade region 22a. The flow orientation unit 32a, particularly the associated flow orientation element 98a, deflects the dust and / or chip particles passing through the dust and / or chip outlet openings 30a, 60a, and 90a, and the airflow 94a carrying dust and / or chip particles passing through the dust and / or chip outlet openings 30a, 60a, and 90a, into this outward pointing direction. The angle 104a between the tangential direction 50a of the saw blade 14a / saw blade region 22a and this outward pointing direction 48a is less than 60°. The flow orientation unit 32a, particularly the flow orientation element 98a, deflects the airflow 94a carrying dust and / or chip particles passing through the dust and / or chip outlet opening 30a into this outward pointing direction. The channel 64a is angularly oriented relative to the radial direction 34a and the saw teeth of the saw blade 14a in the same direction. The channel 64a is oriented relative to the radial direction 34a in the rotational direction of the saw blade 14a.

[0032] exist Figures 4 to 6 Three additional embodiments of the invention are illustrated below. The following description and drawings are essentially limited to the differences between the embodiments, wherein reference may also be made in principle to other embodiments, especially those with the same names, particularly those having the same reference numerals. Figures 1 to 3 The accompanying drawings and / or description. To distinguish embodiments, the letter 'a' is appended. Figures 1 to 3 Following the reference numerals in the accompanying drawings of the embodiments. Figures 4 to 6 In one embodiment, the letter 'a' is replaced by letters 'b' through 'd'.

[0033] exist Figure 4The lower saw blade guard 24b of the alternative dust and / or chip removal device 72b is shown schematically and in perspective view. The lower saw blade guard 24b has dust and / or chip removal openings 30b, 60b. The alternative dust and / or chip removal device 72b has an alternative flow orientation unit 32b. The alternative flow orientation unit 32b includes an alternative flow orientation element 100b for each dust and / or chip removal opening 30b, 60b. The alternative flow orientation element 100b is configured as a tab 66b. The tab 66b protrudes externally from the associated dust and / or chip removal opening 30b.

[0034] exist Figure 5 The image shows a schematic cross-sectional view passing through a portion of the second alternative dust and / or chip removal device 72c and a portion of the saw blade 14c. The second alternative dust and / or chip removal device 72c has an upper saw blade guard 16c and a lower saw blade guard 24c retractable into the upper saw blade guard 16c. Figure 5 In the illustration, the lower saw blade guard 24c is precisely recessed into the upper saw blade guard 16c. The lower saw blade guard 24c has a dust and / or chip discharge opening 30c. The lower saw blade guard 24c has an additional dust and / or chip discharge opening 40c. The additional dust and / or chip discharge opening 40c is arranged next to the dust and / or chip discharge opening 30c in a direction 102c extending in the circumferential direction parallel to the saw blade axis 12c and / or perpendicular to the saw blade 14c or in the circumferential direction of the saw blade region 22c of the second alternative dust and / or chip discharge device 72c. The dust and / or chip discharge openings 30c and 40c are arranged only in the radially outer side 44c of the lower saw blade guard 24c. The second alternative dust and / or chip discharge device 72c has a flow orientation unit 32c. The flow orientation unit 32c includes a flow orientation element 98c associated with the dust and / or chip outlet 30c. The flow orientation unit 32c includes another flow orientation element 92c associated with a separate dust and / or chip outlet 40c. The flow orientation elements 92c and 98c are respectively configured as channels 64c extending obliquely through the wall 62c of the lower saw blade guard 24c. The flow orientation unit 32c, and in particular the flow orientation element 98c, is configured to deflect the airflow 94c containing dust and / or chip particles through the dust and / or chip outlet 30c into a lateral direction 36c that extends at an angle relative to the saw blade plane 38c of the saw blade region 22c. The flow orientation unit 32c, and in particular the additional flow orientation element 92c, is configured to deflect an airflow 94c containing dust and / or chip particles through an additional dust and / or chip outlet 40c into a lateral direction 42c that extends at an angle opposite to the aforementioned lateral direction 36c relative to the saw blade plane 38c of the saw blade region 22c.

[0035] exist Figure 6 The diagram shows a schematic cross-sectional view passing through a portion of the third alternative dust and / or chip removal device 72d and a portion of the saw blade 14d. The third alternative dust and / or chip removal device 72d has an upper saw blade guard 16d and a lower saw blade guard 24d retractable into the upper saw blade guard 16d. Figure 6 In the illustration, the lower saw blade guard 24d is precisely recessed into the upper saw blade guard 16d. The lower saw blade guard 24d has a dust and / or chip discharge opening 30d. The lower saw blade guard 24d has an additional dust and / or chip discharge opening 40d. The additional dust and / or chip discharge opening 40d is arranged next to the dust and / or chip discharge opening 30d in a direction 102d extending circumferentially in the saw blade region 22d parallel to the saw blade axis 12d and / or perpendicular to the saw blade 14d or the third alternative dust and / or chip discharge device 72d. The dust and / or chip discharge openings 30d and 40d are only arranged in the side 58d / side wall of the lower saw blade guard 24d. The third alternative dust and / or chip discharge device 72d has a flow orientation unit 32d. The flow orientation unit 32d includes a flow orientation element 98d associated with a dust and / or chip outlet 30d. The flow orientation unit 32d includes another flow orientation element 92d associated with a further dust and / or chip outlet 40d. The flow orientation elements 92d and 98d are each configured as channels 64d extending obliquely through the wall 62d of the lower saw blade guard 24d. The lower saw blade guard 24d has a radially outer side 44d. A recess 46d is constructed in the region of the radially outer side 44d between the dust and / or chip outlet 30d and the further dust and / or chip outlet 40d. The recess 46d forms a vortex recess. The vortex recess allows the vortices of the airflow 94d passing through the dust and / or chip outlets 30d and 40d to tumble optimally against each other (see also...). Figure 6 (The arrow in the image).

Claims

1. A dust and / or chip removal device (72a-d) for a handheld machine tool (10a-d), the handheld machine tool having a saw blade (14a-d) that generates dust and / or chips and is rotatable about a saw blade axis (12a-d), The dust and / or chip removal device has an upper saw blade guard (16a-d) preferably fixedly arranged in a position, the upper saw blade guard being configured to at least substantially and permanently cover the portion (20a-d) of the saw blade area (22a-d) of the handheld machine tool (10a-d) facing away from the workpiece machining area (18a-d), the saw blade area accommodating the saw blade (14a-d), and The dust and / or chip removal device has a lower saw blade guard (24a-d) movably supported relative to the upper saw blade guard (16a-d), and particularly rotatably supported about the saw blade axis (12a-d). The lower saw blade guard is configured to, at least in a static state (84a-d), at least substantially cover the portion (26a-d) of the saw blade region (22a-d) facing the workpiece machining area (18a-d), and the lower saw blade guard is configured to, at least during sawing operations (86a-d), at least partially retract into the upper saw blade guard (16a-d), at least partially exposing the portion (26a-d) of the saw blade region (22a-d) facing the workpiece machining area (18a-d), in which the saw blade (14a-d) is submerged in the workpiece (28a-d). in, The lower saw blade guard (24a-d) has at least one dust and / or chip discharge opening (30a-d) through which dust and / or chips generated by the rotating saw blade (14a-d) can be discharged from the saw blade area (22a-d). The feature is that it includes a flow orientation unit (32a-d), which is at least configured to deflect dust and / or chip particles passing through the dust and / or chip outlet (30a-d) in a radial direction (34a-d) perpendicular to the saw blade axis (12a-d), and especially in the radial direction perpendicular to the saw blade axis of the saw blade region (22a-d).

2. The dust and / or chip removal device (72c-d) according to claim 1, characterized in that, The flow orientation unit (32c-d) is configured to deflect dust and / or chip particles passing through the dust and / or chip outlet (30c-d) to at least one lateral direction (36c-d), the lateral direction extending at an angle relative to the saw blade plane (38c-d) of the saw blade region (22c-d).

3. The dust and / or chip removal device (72c-d) according to claim 1 or 2, characterized in that, The lower saw blade guard (24c-d) has at least one additional dust and / or chip outlet (40c-d), which is arranged next to the dust and / or chip outlet (30c-d) in a direction (102c-d) extending parallel to the saw blade axis (12c-d).

4. The dust and / or chip removal device (72c-d) according to claims 2 and 3, characterized in that, The flow orientation unit (32c-d) is configured to deflect dust and / or chip particles passing through the additional dust and / or chip outlet (40c-d) at least to another lateral direction (42c-d), which extends at an opposite angle to the saw blade plane (38c-d) of the saw blade region (22c-d) compared to the lateral direction (36c-d).

5. The dust and / or chip removal device (72d) according to claim 3 or 4, characterized in that, A recess (46d) is arranged on the radially outer side (44d) of the lower saw blade guard (24d), between the dust and / or chip outlet (30d) and the additional dust and / or chip outlet (40d), the recess forming a vortex recess in particular.

6. The dust and / or chip removal device (72a-d) according to any one of the preceding claims, characterized in that, The flow orientation unit (32a-d) is configured to deflect dust and / or chip particles passing through the dust and / or chip outlet (30a-d) at least in one direction (48a-d), particularly in an outwardly pointing direction, which is parallel to the saw blade plane (38a-d) of the saw blade region (22a-d) and extends at an angle relative to the radial direction (34a-d).

7. The dust and / or chip removal device (72a-d) according to claim 6, characterized in that, The flow orientation unit (32a-d) deflects dust and / or chip particles passing through the dust and / or chip outlet (30a-d) to a direction (48a-d), in particular the outward pointing direction is different from the tangential direction (50a-d) of the saw blade (14a-d) / the saw blade region (22a-d).

8. The dust and / or chip removal device (72a-d) according to claim 7, characterized in that, The angle (104a-d) between the tangential direction (50a-d) of the saw blade (14a-d) / the saw blade region (22a-d) and the direction (48a-d) to which the dust and / or chip particles passing through the dust and / or chip outlet (30a-d) are deflected by the flow orientation unit (32a-d), particularly the outward pointing direction, is less than 60°, preferably less than 45°.

9. The dust and / or chip removal device (72a-d) according to any one of claims 1, 6, 7 or 8, characterized in that, The lower saw blade guard (24a-d) has at least one additional dust and / or chip outlet (60a-d), which is arranged in front of or behind the dust and / or chip outlet (30a-d) in a direction (52a-d) surrounding the saw blade area (22a-d) on the outside.

10. The dust and / or chip removal device (72a-d) according to claim 9, characterized in that, With the lower saw blade guard (24a-d) retracted to its maximum extent into the upper saw blade guard (16a-d), the dust and / or chip outlet (30a-d) and the additional dust and / or chip outlet (60a-d) are respectively opposite to the inner wall or inner wall region (54a-d, 56a-d) of the upper saw blade guard (16a-d) at different distances.

11. The dust and / or chip removal device (72a-d) according to any one of the preceding claims, characterized in that, The dust and / or chip outlet (30a-d) is partially or completely located on the side (58a-d) of the lower saw blade guard (24a-d).

12. The dust and / or chip removal device (72a; 72c-d) according to any one of the preceding claims, characterized in that, The flow orientation unit (32a; 32c-d) passes at least partially through the wall (62a; 32c-d) that is obliquely through the lower saw blade guard (24a; 24c-d). The channel (64a; 64c-d) extending from 62c-d is formed.

13. The dust and / or chip removal device (72b) according to any one of the preceding claims, characterized in that, The flow orientation unit (32b) is at least partially constituted by a tab (66b) / turbulent that protrudes at least partially from the outside of the dust and / or chip outlet (30b).

14. The dust and / or chip removal device (72a-d) according to any one of the preceding claims, characterized in that, The upper saw blade guard (16a-d) has an attachment interface (68a-d) for a dust and / or chip container (82a-d) and / or for a vacuum cleaner hose.

15. A handheld machine tool (10a-d), particularly a handheld circular saw, the handheld machine tool having a saw blade area (22a-d), into which a saw blade (14a-d) can be fitted, such that a workpiece (28a-d) arranged in a workpiece processing area (18a-d) of the handheld machine tool (10a-d) can be processed by means of the saw blade (14a-d), and the handheld machine tool having a drive unit (70a-d) for generating rotation of the saw blade (14a-d) arranged in the saw blade area (22a-d) about a saw blade axis (12a-d) of the drive unit (70a-d), characterized in that, The device (72a-d) is provided for removing dust and / or chips according to any one of the preceding claims.

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