DUST COLLECTION DEVICE FOR AN ELECTRICALLY OPERATED TOOL AND ELECTRICALLY OPERATED TOOL

Abstract

Dust collection device (1A) for an electrically powered tool, comprising a main body housing (2) that can be attached to the electrically driven tool, a dust box (11) provided on the main body housing (2) in which a filter (38) is arranged, and a sliding section (20) which is provided on the main body housing (2) and which has a nozzle (21) with a suction opening (26) at a front end, wherein a dust channel (R) is formed from the suction opening (26) to the filter (38), characterized by the fact that the sliding section (20) is formed by several stages of pipe bodies (22, 23) which have the dust channel (R) arranged inside and whose diameter decreases towards the front, and which can be extended and retracted. a stop mechanism (55B) is provided which restricts the extension of a pipe body (23) on the small diameter side from a superposition state of adjacent pipe bodies (22), the stop mechanism (55B) comprises a detent section (81) provided on the side of the tube body (23) with a small diameter and a detent receptacle section (82) provided on the side of the tube body (22) with a large diameter, into which the detent section (81) detent, and the nozzle (21) is connected to the front end of the foremost tube body in an upward direction, wherein the locking section (81) is a sliding element (81) which is provided to be displaceable along the nozzle (21) in the up-down direction and locks into the locking receiving section (82) in the lower position.

Description

Technical field

[0001] The present invention relates to a dust collection device for an electrically powered tool, which is attached to an electrically powered tool such as an electrically powered drill or hammer drill, and to an electrically powered tool to which the dust collection device is attached. General state of the art

[0002] It sometimes happens that electrically powered tools, such as an electric drill or a rotary hammer, are equipped with a dust collection device to capture dust generated by the workpiece during drilling. Such a dust collection device for an electrically powered tool is known from JP 2008-207 258 A. In this device, a filter is housed in a dust collection box attached to the housing of the drilling tool. The upstream side of the filter is connected to a dust collection adapter via a dust collection hose, while the downstream side is connected to a dust blower located inside the housing of the electrically powered tool. The rotation of the dust blower, in conjunction with the operation of the electrically powered tool, draws dust and air from the dust collection adapter and collects it via the dust collection hose from the filter in the dust collection box.The dust collection adapter is supported by a telescopic bearing element, which is formed from several tubular elements, and can be extended and retracted in connection with the drilling operation.

[0003] US 2009 / 0148248A1 describes a drilling tool comprising a motor, a geared drive unit for transmitting a rotational force from the motor to rotate a drill bit, and a dust collector for collecting dust generated by a workpiece being drilled with the drill bit, wherein the dust collector is provided with a through-hole section pierced by the drill bit, a dust extraction opening for drawing in the generated dust and the surrounding air, and a blowout opening for blowing air against an area near the piercing drill bit.

[0004] US Patent 6,851,898 B2 describes a dust extraction device comprising an adjustable axial depth stop for a hand tool that is at least partially rotatable, with a radially offset, rotationally fixed, telescopic, axially limited-movement suction tube assembly, the suction tube being parallel to the axis of the tool and connected at one end to a suction head. The suction tube includes an axially extending bellows. Brief description of the invention; Problem of the present invention

[0005] Since, in such a dust collection device for an electrically driven tool of the prior art, the dust collection adapter is supported by the telescopic bearing element, it can also be used for a so-called long bit, i.e., a front-end tool of 150 mm or larger. However, because connecting the dust collection hose between the dust collection adapter and the dust collection box creates a dust channel separate from the bearing element of the dust collection adapter, there is a risk that the dust collection hose will obstruct the work.

[0006] Therefore, the present invention is based on the objective of providing a dust collection device for an electrically driven tool and an electrically driven tool, wherein a dust channel can be formed without hindering the work, while at the same time a long bit can also be used. Means of solving the task

[0007] The objective is achieved by the subject matter of independent claims 1 and 2 and dependent claim 4. Further embodiments are defined in the dependent claims.

[0008] According to the invention, a dust collection device for an electrically driven tool comprises a main body housing that can be attached to the electrically driven tool, a dust box provided on the main body housing in which a filter is arranged, and a sliding section provided on the main body housing that is movable in a front-to-back direction and has a nozzle with a suction opening at a front end, wherein a dust channel is formed from the suction opening to the filter, and is characterized in that the sliding section is formed by several stages of tube bodies which have the dust channel arranged inside and whose diameter decreases towards the front, and which can be extended and retracted. A stop mechanism is provided which restricts the extension of a tube body on the side with the small diameter from a superimposed state of adjacent tube bodies.The stop mechanism comprises a detent section provided on the side of the small diameter tube body and a detent receiving section provided on the side of the large diameter tube body, into which the detent section detent.

[0009] “On the side of the pipe body” includes both the case where the locking section is provided on the small diameter pipe body itself, and the case where the locking section is provided on a component such as a nozzle or the like, which is provided on the pipe body.

[0010] According to independent claim 1, the nozzle is connected upwards to the front end of the foremost tube body, wherein the locking section is a sliding element which is provided to be displaceable along the nozzle in the top-bottom direction and which locks into the locking receiving section in the lower position.

[0011] According to independent claim 2, the snap-in section is a hook provided on the tube body on the side with the small diameter and which snaps into the snap-in receiving section from the inside of the tube body on the side with the large diameter.

[0012] The stop mechanism can be an actuating element rotatably arranged on the large-diameter side of the tube body and having a stop section projecting towards the central side of the tube body, and comprising a convex section provided on the small-diameter side of the tube body and positioned behind the stop section in a state where the tube bodies overlap, wherein, in the state where the tube bodies overlap, the stop section is brought into alignment with the position of the convex section by means of a rotary actuating of the actuating element, the extension of the tube body on the small-diameter side is restricted.

[0013] Between the main body housing and the tube body of the first stage, which is inserted into the main body housing, a positioning mechanism that sets an initial position of the tube body in relation to the main body housing and a depth adjustment mechanism that limits a retracted position of the tube body may be provided. Effect of the invention

[0014] According to claims 1 to 4, the sliding section is designed to be extendable and retractable by means of several stages of pipe bodies arranged inside the dust channel, the diameter of which decreases towards the front. This allows the sliding section to serve both as a bearing element for the nozzle and as a dust channel, thus eliminating the need to connect a dust collection hose between the nozzle and the dust box to form the dust channel. Therefore, a dust channel can be formed without obstructing work, while simultaneously allowing the use of a long bit.

[0015] According to the invention, it is also possible to conveniently switch to a short bit by using the stop mechanism, which increases user-friendliness.

[0016] According to the invention, the stop mechanism can also be made simpler by using the locking section and the locking receiving section.

[0017] According to independent claim 1, by having the locking section be a sliding element provided on the nozzle, it is possible to conveniently switch between the used and unused stop mechanism by actuating the sliding element upwards and downwards, and the structure can also be simplified.

[0018] According to independent claim 2, the fact that the locking section is a hook allows for convenient switching between the used and unused stop mechanisms by engaging and disengaging the hook. Since the hook engages the locking section from the inside of the pipe body, it does not spring out of the pipe body when engaged and therefore does not obstruct work.

[0019] Because the stop mechanism can be an actuating element, it is easy to switch between the used and unused stop mechanism by rotating the actuating element.

[0020] By using the positioning mechanism and the depth adjustment mechanism, even when using the extendable and retractable sliding section, the initial position or the processing depth can be easily adjusted. Brief description of the characters

[0021] They show: Fig. 1 a side view of a dust collection device for an electrically driven tool (extended state of the sliding section); Fig. 2 a central vertical sectional view of the dust collection device for an electrically driven tool (extended state of the sliding section); Fig. 3 a side view of the dust collection device for an electrically driven tool (retracted state of the sliding section); Fig. 4 a central vertical sectional view of the dust collection device for an electrically driven tool (retracted state of the sliding section); Fig. 5 a side view in the state of attachment to a rotary hammer; Fig. 6 a side view of a modified example of the dust collection device for an electrically driven tool (advanced position of the inner tube); Fig. 7 a central vertical sectional view of the sliding section (advanced position of the inner tube); Fig. 8 a top view of a modified example of the dust collection device for an electrically driven tool (reverse position of the inner tube); Fig. 9 a side view of a modified example of the dust collection device for an electrically driven tool (reverse position of the inner tube); Fig. 10 a central vertical sectional view of the sliding section (reverse position of the inner tube); Fig. 11 a side view in the state of attachment to a rotary hammer; Fig. 12 an explanatory view of a modified example of the stop mechanism (advanced position of the inner tube), wherein Fig. 12(A) a central vertical sectional view and Fig. 12(B) is a sectional view along line AA; Fig. 13 an explanatory view of a modified example of the stop mechanism (reverse position of the inner tube), wherein Fig. 13(A) a central vertical sectional view and Fig. 13(B) is a sectional view along line AA; Fig. 14 a perspective view of a modified example of the stop mechanism (inner tube in the extended position); Fig. 15 an explanatory view of a modified example of the stop mechanism (inner tube in advanced position), wherein Fig. 15(A) a side view and Fig. 15(B) is a central vertical section view; Fig. 16 a perspective view of a modified example of the stop mechanism (inner tube in reverse position); and Fig. 17 an explanatory view of a modified example of the stop mechanism (inner tube in reverse position), wherein Fig. 17(A) a side view and Fig. 17(B) is a central vertical section view. embodiment of the invention

[0022] In the following, an embodiment of the present invention will be described with reference to the figures.

[0023] Fig. Figure 1 shows a side view of a dust collection device for an electrically powered tool (hereinafter referred to as "dust collection device") and Fig. Figure 2 shows a central vertical sectional view.

[0024] The dust collection device 1 has an L-shaped main body housing 2 (when viewed from the side), formed by joining a left and right housing half. An engagement recess 3, described later, is formed at the top of its rear surface and engages with a mounting section 72 of a rotary hammer 70. A motor 4 with a forward-facing output shaft 5 is mounted laterally behind the main body housing 2, and a control device 6 is located behind the motor. A dust blower 7 is attached to the output shaft 5 and is housed inside an intake chamber 8, which is partitioned within the main body housing 2 and has exhaust openings 9, 9... on one side surface. A connecting section 10 of the dust box 11 is formed in front of the intake chamber 8.The connecting section 10 has a concave shape open only to the front, and a connecting bore 13 is formed coaxially with the dust blower 7 on a rear partition 12, which forms the bottom of the connecting section 10, connecting the connecting section 10 with the intake chamber 8, while a sealing ring 14 is attached to the connecting bore 13, into which a wire mesh is inserted.

[0025] Three plate-shaped, rearwardly projecting plug connectors 15, 15... for power supply and communication are arranged at a specific distance in a left-right direction on an engagement recess section 3 of the main body housing 2. These plug connectors 15 are electrically connected to the control unit 6 by wires (not shown).

[0026] At the rear of the upper surface of the main body housing 2, a pressure rail 16 projects forward in a front-to-back direction, engaging in a guide groove (not shown) provided on the mounting section 72 of a rotary hammer 70, and on its left and right sides, a pair of guide rails 17, 17 project forward in a front-to-back direction. At the upper end of each of the guide rails 17, a projecting strip 18 is formed, which can engage in a connecting groove (not shown) on the side surface of the mounting section 72.

[0027] Above the connecting section 10, a tubular guide channel 19 is formed in a front-to-back direction. Its front end is open, while its rear end forms a U-shaped bend and extends behind the connecting section 10. A nozzle 21 is connected to this guide channel 19 via a sliding section 20. The sliding section 20 is telescopic, consisting of two tubular bodies: an outer tube 22 inserted coaxially into the guide channel 19 and an inner tube 23 inserted coaxially into the outer tube 22. The outer tube 22 is movable back and forth between a retracted position, in which a detent section (not shown) at its rear end rests against a rear stop (not shown) in the guide channel 19, and a forward position, in which the detent section rests against a front stop (not shown).The inner tube 23 is movable back and forth between a retracted position, in which a stepped section 24 provided at the front end rests against the front end of the outer tube 22, and a forward position, in which a detent section (not shown) provided at the rear end rests against a stop (not shown) in the outer tube 22. The nozzle 21 is an L-shaped tube body in which a tube section 25 with a smaller diameter than the inner tube 23 is formed at one base end, with an annular intake opening 26 formed at the front end being open to the front and rear.A rubber cap 27 is placed in the rearward opening of the intake opening 26, on which several incisions are formed radiating from the center of a borehole, and a rubber locking ring 28 is releasably placed on the forward-facing opening, which in a state of installation on a bore surface forms a seal to the bore surface.

[0028] Therefore, the sliding section 20 is between an extended state and Fig. 1 and Fig. 2, in which the outer tube 22 and the inner tube 23 are each in the extended position and the nozzle 21 is positioned in a position furthest in front of the guide channel 19, and a retracted state Fig. 3 and Fig. 4 extendable and retractable, in which the outer tube 22 and the inner tube 23 are each in the retracted position and the nozzle 21 is closest to the guide channel 19.

[0029] A tubular conduit 29 is coupled to the rear end of the guide channel 19 and is bent in a U-shape corresponding to the shape of the rear end of the guide channel 19. The upper surface of the conduit 29 is formed as a round tube, and the lower surface as an elongated rectangular tube. A front end section 30 on the lower surface branches out in a V-shape to the left and right, and a pair of left and right blowout openings 31 open obliquely forward. When the conduit 29 is installed, the front end section 30 passes through the partition 12 and projects into the interior of the connecting section 10.

[0030] The pipe section 25 of the nozzle 21, in turn, projects coaxially into the front end of the inner pipe 23, and inside the sliding section 20 a spirally shaped flexible hose 32 is accommodated, the rear end of which is connected to the upper end of the line 29 and the front end of which is connected to the pipe section 25. Since the flexible hose 32 expands and contracts together with the sliding section 20 inside the sliding section 20 when it is extended and retracted, the connection between the nozzle 21 and the line 29 is maintained.

[0031] The dust box 11 is detachably attached to the connecting section 10. The dust box 11 has a cuboid main body 33 and a lid 34 connected to the opening of the main body 33 by means of a hinge. On one side of the lid 34, a rectangular inlet 35 and on the other side a round outlet 36 are formed longitudinally. At a position covering the outlet 36, a filter unit 37, comprising a pleated paper filter 38, is provided in a position where the filter surface projects into the main body 33. A projecting section 39, extending outwards beyond the outer surface of the lid 34, is formed around the entire circumference of the edge of the outlet 36.

[0032] A groove 41 is formed on one end surface on the short side of the main body of the box 33, which is joined to a received shaft 40 extending in a left-right direction, which is provided at the lower end of the connecting section 10, and a detent piece 43 is formed on the other end surface, which elastically engages in a detent projection section 42 provided on the upper inside surface of the connecting section 10.

[0033] The dust box 11 is thus attached to the connecting section 10 by pressing it vertically onto the connecting section 10 from an inclined position in which the cover body 34 faces rearward and the groove 41 is aligned with the received shaft 40 from the front, causing the locking piece 43 to engage with the locking projection section 42. In this attached state, the front end section 30 of the line 29 is inserted into the inlet 35 and projects into the interior of the main body of the box 33, and the outlet 36 is positioned opposite and connected to the connecting bore 13, while the sealing ring 14 is pressed onto the entire outer circumference of the projecting section 39, creating a seal between the partition 12 and the cover body 34.In this way, a dust channel R is formed inside the dust collection device 1, which extends from the intake opening 26 through the nozzle 21, the flexible hose 32 and the line 29 to the filter 38 inside the main body of the box 33.

[0034] Fig. Figure 5 is a side view showing the dust collection device 1 attached to a rotary hammer 70. On the rotary hammer 70, a mounting section 72 is formed at the bottom of the front of a housing 71, which is formed by combining a pair of left and right housing halves. This mounting section accommodates a motor (not shown) and is joined to the engagement recess section 3 of the dust collection device 1. Above the mounting section 72, a tool holder is mounted facing forward via a rotary and impact mechanism, and a front-end tool can be attached to a forward-projecting front end of the tool holder. Figure 73 denotes an operating sleeve for attaching the front-end tool. A handle 74 with a switching lever 19 is formed at the rear upper part of the housing 71, and a battery pack 76, serving as a power supply, is attached below the handle.Inside the mounting section 72, a main device-side control unit is accommodated, and on the underside surface of the mounting section 72, a guide groove (not shown) is provided centrally in the left-right direction, into which the pressure rail 16 of the dust collection device 1 is inserted in the front-back direction, while on the left and right outer surfaces of the mounting section 72, a connecting groove (not shown) is provided in the front-back direction, into which the protruding strip 18 of the guide rails 17, 17 is inserted.

[0035] Inside the mounting section 72, a connector with a locking section at the front end of the top surface, on which three connection sockets for power supply and communication are arranged in a left-right direction, is rotatably mounted between an upper connecting position, in which the locking section is retracted to a position above a frontally open insertion opening and the opening is positioned directly behind the insertion opening, and a non-connecting position, in which the locking section is positioned directly behind the insertion opening and the opening is retracted to a position below the insertion opening. In a state in which the dust collection device 1 is not attached, the connector is pre-tensioned by a torsion spring to rotate into the non-connecting position, in which the locking section closes the insertion opening.

[0036] When the dust collection device 1 is attached to the rotary hammer 70 and the guide rails 17, 17 of the main body housing 2 are positioned on the underside of the mounting section 72, so that the mounting section 72 is positioned on the top of the rear section of the main body housing 2, the dust collection device 1 is pushed backwards, such that the engagement recess section 3 engages the mounting section 72 from the front. This causes the pressure rail 16 of the dust collection device 1 to engage in the guide groove of the mounting section 72 and the projecting strip 18 of the guide rails 17, 17 to engage in the connecting groove.The pressure rail 16 lifts the pressure piece provided on the underside of the connector, causing the connector to retract to a position above the locking section. This allows the connector to move into the connection position, where its opening is positioned directly behind the insertion opening. Consequently, the plug connector 15 of the dust collection device 1 passes through the released insertion opening into the interior of the mounting section 72. Simultaneously, as the mounting section 72 engages the engagement recess 3, it is also inserted into the socket and electrically connected. The structure of the connector and the locking section, as well as the mechanism for sliding the dust collection device 1 into place, are disclosed and known in the applicant's earlier application JP 2013-49123A.

[0037] In this way, the intake opening 26 of the nozzle 21 is positioned in front of the operating sleeve 73 when the dust collection device 1 is attached. If the front end tool attached to the tool holder is a long bit of 150 mm, as shown in Fig. As shown in Figure 5, the sliding section 20 is extended and the initial position of the nozzle 21 is adjusted so that the front end of the long bit LB is positioned at the intake opening 26. If, on the other hand, the front-end tool is a drill bit of less than 150 mm (hereinafter referred to as the "short bit"), the sliding section 20 is retracted and the initial position of the nozzle 21 is adjusted so that the front end of the short bit is positioned at the intake opening 26.

[0038] The front-end tool and the suction opening 26 are then brought into contact with the drilling surface, and the switch is turned on and the motor is driven by pressing a switching lever 75 of the rotary hammer 70. If now a switching lever 77 provided on the side surface of the housing 71 ( Fig. 11) If a drilling mode or a hammer drilling mode is selected as the operating mode, the front end tool can rotate and create a borehole on the drilling surface, with the front end tool passing through the suction opening 26 as the drilling process progresses and the sliding section 20 retracting and the nozzle 21 also retracting accordingly.

[0039] By switching on the switch, the main unit's control unit supplies power to the control unit 6 of the dust collection device 1. The control unit 6 then drives the motor 4, causing the dust blower 7 to rotate. This draws in outside air through the intake opening 26 of the nozzle 21, which passes through the flexible hose 32 and the line 29 and is discharged from the blowing openings 31 of the front end section 30 into the interior of the main body 33 of the dust box 11. It then flows in front of the filter unit 37, passes through the filter surface and the filter 38, exits the outlet 36 via the connecting bore 13 into the intake chamber 8, and is discharged to the outside through the exhaust openings 9.Dust generated at the drilling surface is thus drawn in through the suction opening 26 and guided via the nozzle 21, the flexible hose 32 and the line 29 into the dust box 11, captured by the filter 38 and collected inside the main body of the box 33.

[0040] When the pressure on the trigger lever is released, thus switching off the power, the motor stops and the rotation, etc., of the front tool ceases. However, since the main unit's control unit has a delay function, which interrupts the power supply to the dust collection device 1 only a few seconds after the switch is turned off, the dust blower 7 of the dust collection device 1 continues to rotate for a few seconds after the front tool stops. Therefore, any dust remaining in the nozzle 21, the flexible hose 32, etc., is reliably collected in the dust box 11.

[0041] When removing the dust collection device 1, the dust collection device 1 is moved forward from the rotary hammer 70 in the opposite direction to the installation process. The dust collection device 1 is pushed forward by guiding the pressure rail 16 in the guide groove 24 and by guiding the protruding strip 18 in the connection groove, thereby releasing the plug connector 15 from the connector and pulling it out of the insertion opening. Due to the advance of the pressure rail 16, the pressure piece is no longer lifted, so that the connector returns to the unconnected position due to the preload of the torsion spring, and the locking section closes the insertion opening again.

[0042] When removing the dust box 11 from the dust collection device 1, the dust box 11 is tilted away from the connecting section 10 about the axis 40, in the opposite direction to its installation, in a state where the locking projection 42 is released from the locking piece 43, so that the dust box 11 can be removed from the connecting section 10 14. By opening the lid 34, the dust in the main body of the box 33 can be disposed of.

[0043] Thus, in accordance with the dust collection device 1 and the rotary hammer 70, the flexible hose 32, which forms the dust channel R, is provided in the sliding section 20, which also allows the use of a long bit LB, and the sliding section 20 is designed to be extendable and retractable by several stages of pipe bodies (outer pipe 22, inner pipe 23) whose diameter decreases towards the front, allowing it to serve simultaneously as a bearing element for the nozzle 21 and as a dust channel. Therefore, it is not necessary to connect a dust collection hose between the nozzle 21 and the dust box 11 to form the dust channel. Consequently, a dust channel R can be formed without obstructing work, while at the same time allowing the use of a long bit.

[0044] Furthermore, a positioning mechanism for setting an initial position and a depth adjustment mechanism for adjusting the borehole depth (the retracted position of the outer tube 22) can be provided on the sliding section 20. Fig. Figure 6 shows an example of this, wherein in a dust collection device 1A a positioning mechanism 45 is formed from a web 47, which is formed in the front-back direction on a flat surface 46 provided on the side surface of the outer tube 22, and a positioning knob 48, which is displaceable in the up-down direction on the front end of the main body housing 2 and is pre-tensioned to a lower limit position by a pre-tensioning means (not shown), wherein in the lower limit position an elastic element (not shown) provided on the inner surface side elastically engages the web 47 from above. The in Fig. Reference numeral 49 appearing on the rear side surface of the main body housing 2 designates a release button for unlocking a locking piece (not shown) which locks into place on the mounting section 72 to determine the mounting status.

[0045] Thus, by moving the outer tube 22 into any initial position in a state where the positioning knob 48 is pressed upwards and the detent on the bridge 47 is released, and then releasing the positioning knob 48 in the set initial position and elastically detenting it on the bridge 47, the outer tube 22 is positioned in the respective initial position.

[0046] The depth adjustment mechanism 50 is formed, in addition to the web 47, by rails 51, 51, which are provided on the upper and lower sides of the flat surface 46, an adjustment knob 52, which is provided to be displaceable on the rails 51, 51 in the front-back direction and is displaceable in the top-down direction and is pre-tensioned to a lower limit position by a pre-tensioning means (not shown), wherein in the lower limit position a detent piece (not shown) provided on the inner surface side elastically engages the web 47 from above, and a contact section 53, which is provided in front of the positioning knob 48 at the front end of the main body housing 2 and against which the retracted adjustment knob 52 comes into contact.

[0047] Therefore, if the adjusting knob 52, in a state where it is pressed upwards and the detent on the web 47 is released, is moved forwards or backwards along the rails 51, 52 to a desired setting position, and then the adjusting knob 52 is released in the set setting position and detent on the web 47, a length is determined where the degree of displacement of the inner tube 23 is added to the distance between the rear end face of the adjusting knob 52 and the front end of the system section 53, resulting in the maximum drilling depth. The retraction of the outer tube 22 in connection with the drilling process is limited by the position in which the adjusting knob 52 comes into contact with the system section 53.

[0048] By providing in this way the positioning mechanism 45, which sets the initial position of the outer tube 22 in relation to the main body housing 2 between the main body housing 2 and the outer tube 22 inserted into the main body housing 2, and the depth adjustment mechanism 50, which limits the retracted position of the outer tube 22, the initial position and the drilling depth can be easily adjusted despite the use of an extending and retracting sliding section 20.

[0049] In the above embodiment, the sliding section is formed by two stages of tube bodies, namely the outer tube and the inner tube, allowing it to be extended and retracted. However, the sliding section can also be formed by three or more stages of tube bodies. In this case, the depth adjustment mechanism can also be provided between the individual adjacent tube bodies.

[0050] Furthermore, a stop mechanism 55 is provided on the sliding section 20, which, in the position of the inner tube 23 in which it has retracted into the outer tube 22, engages with the outer tube 22 and restricts forward movement of the inner tube 23. As in Fig. As shown in Figure 7, the stop mechanism 55 is formed from a hook 56 provided on the inner tube 23 as a detent section and a detent pin 57 provided on the outer tube 22 as a detent receptacle section. The hook 56 is initially coupled to the base end via a bearing shaft 59 between a pair of left and right projections 58, 58 projecting on the upper surface at the front end of the inner tube 23. It is rotatably mounted between a horizontal position, in which it is positioned in a lower recess 60 formed at the front end of the inner tube 23, and an upright position, in which it rests against the rear surface of the nozzle 21. In the horizontal position, the front end of the hook 56 points upwards. In the normal state, the hook 56 is held in the position indicated by a torsion spring 61 provided on the bearing shaft 59. Fig. 7 shown upright position pre-tensioned.

[0051] On the upper side at the front end of the outer tube 22, an upper recess 62 is formed, into which, in the retracted position of the inner tube 23, projections 58, 58 of the inner tube 23 and the hook 56 engage in a horizontal position, and the locking pin 57 is formed in a left-right direction at a position in the upper recess 62, at which the front end of the hook 56 engages, which seeks to rise from the horizontal position.

[0052] By using a short bit in a state where the hook 56 is pressed into the horizontal position, inserting the inner tube 23 into the outer tube 22, and releasing the depressing of the hook 56 in the retracted position where the front end of the hook 56 is positioned below the locking pin 57, the hook 56, which attempts to rise from the horizontal position, engages the locking pin 57 from the inside (underside), so that the inner tube 23 is coupled to the outer tube 22 in the retracted position, as shown in Fig. Shown 8 to 10.

[0053] If, on the other hand, when using a long bit in a state where the hook 56 is pressed down and the detent with the locking pin 57 is released, the inner tube 23 is pulled forward, the hook 56 returns, as in Fig. 11 shown, back into the upright position so that the sliding section 20 can be extended.

[0054] In the modified example described above, the inclusion of the stop mechanism 55 between the outer tube 22 and the inner tube 23, which restricts the extension of the inner tube 23 from the superimposed position of the two tubes, allows the use of a short bit without difficulty, thus increasing ease of use. In particular, since the stop mechanism 55 is formed by the hook 56 on the inner tube 23 and the locking pin 57 on the outer tube 22, against which the hook 56 engages, the stop mechanism 55 can be easily constructed, and switching between using and disusing the stop mechanism 55 is also easily accomplished by engaging and disengaging the hook 56. Because the hook 56 engages the locking pin 57 from the inside of the outer tube 22, it does not spring out of the outer tube 22 when engaged and does not obstruct work.

[0055] Fig. 12 and Fig. Figure 13 shows a modified example of the stop mechanism. This stop mechanism 55A consists of an actuating ring 64, which serves as an actuating element and is rotatably mounted on the front end of the outer tube 22, and four convex sections 65, 65... formed at equal intervals at the front of the outer circumference of the inner tube 23. First, the actuating ring 64 is placed in a position where its front end projects slightly further than the front end of the outer tube 22, in a position secured against removal. At this front end, four stop sections 66, 66... ​​are formed integrally at equal intervals in the circumferential direction, covering the front end of the outer tube 22 in the radial direction.

[0056] When using a short bit, the inner tube 23 is inserted into the outer tube 22 after the actuating ring 64 has been rotated into a position where the stop section 66 is not axially engaged with the convex section 65 of the inner tube 23. This results in, as shown in Fig. As shown in Figure 13(A), the convex section 65 in the retracted position passes through the stop section 66 of the actuating ring 64 and is positioned on the inside of the front end of the outer tube 22. In this state, when the actuating ring 64 is rotated to a position where the stop section 66 is positioned in front of the convex section 65, the convex section 65 engages with the stop section 66, thus restricting the forward pull of the inner tube 23 and coupling the inner tube 23 to the outer tube 22 in the retracted position. Conversely, when using a long bit, if the actuating ring 64 is rotated and the stop section 66 is retracted from the position in front of the convex section 65, the inner tube 23 can be pulled forward and the sliding section 20 extended.

[0057] In this modified example, the provision of the stop mechanism 55A also allows the use of a short bit without difficulty, thus increasing ease of use. Specifically, the stop mechanism 55A comprises the actuating ring 64, which is rotatably mounted on the outer tube 22 and has the stop section 66 projecting towards the center of the outer tube 22, and the convex section 65, which is mounted on the inner tube 23 and positioned behind the stop section 66 when the two tubes are overlapping. By rotating the actuating ring 64 in the overlapping state, the extension of the inner tube 23 can be restricted, allowing the use of the stop mechanism 55A to be conveniently switched between using and not using it.

[0058] Fig. Figures 14 to 17 show another modified example of the stop mechanism. This stop mechanism 55B is formed by an actuating button 81, which serves as a detent section (sliding element) that is slidably held in an up-down direction on a retaining section 80 provided on the rear surface of the nozzle 21, and a bore hole 82, which serves as a detent receiving section provided on the top at the front end of the outer tube 22.

[0059] The retaining section 80 is formed by a pair of left and right guides 83, 83 projecting from the rear surface of the nozzle 21, an upper stop 84 and a lower stop 85, wherein the actuating button 81 is displaceable between an upper position of the system at the upper stop 84 and a lower position of the system at the lower stop 85. A downward-facing detent 86 is formed on the underside surface of the actuating button 81, which is retracted upwards relative to the lower stop 85 in the upper position and projects downwards relative to the lower stop 85 in the lower position.

[0060] Inside the actuating button 81 are a ball 87, which can be moved forward and backward, and a coil spring 88, which biases the ball 87 forward, with the ball 87 pressing against the rear surface of the nozzle 21 in its normal state. A pair of concave sections 89, 89 are formed on the rear surface of the nozzle 21, into which the ball 87 is inserted, corresponding to the upper and lower positions of the actuating button 81. By inserting the ball 87 into the concave sections 89, 89, the actuating button 81 is held in the upper or lower position, and a "click" sensation of engagement is achieved in both positions.

[0061] On the upper surface at the front end of the outer tube 22, a recessed section 90 is formed into which the nozzle 21 is inserted when the inner tube 23 is in its retracted position. A bore 82 is formed in a shape and size that allows the locking piece 86 to be inserted behind the recessed section 90. This bore 82 is positioned directly below the locking piece 86 of the actuating button 81 when the inner tube 23 is in its retracted position.

[0062] When using a short bit, as in Fig. 14 and Fig. Figure 15 shows the inner tube 23 being inserted into the outer tube 22 in a state where the actuating button 81 is pushed into the upper position. When the actuating button 81 is now pushed into the lower position, as shown in Figure 15, the inner tube 23 is inserted into the outer tube 22 until it retracts. Fig. 16 and Fig. As shown in Figure 17, the locking piece 86 is inserted into the borehole 82 located directly below it and locks into place, thus restricting the inner tube 23 from being pulled forward and coupling the inner tube 23 to the outer tube 22 in the retracted position. However, if, when using a long bit, the actuating button 81 is pushed into the upper position and the locking piece 86 is pulled out of the borehole 82, the inner tube 23 can be pulled forward, as shown in Figure 17. Fig. 14 and Fig. 15 shown, pulled forward and the sliding section 20 extended.

[0063] In this modified example, the inclusion of the stop mechanism 55B also allows the use of a short bit, thus increasing ease of use. In particular, since the actuating button 81 is designed such that the locking section of the stop mechanism 55B is movable in the up-down direction on the nozzle 21 and engages in the bore 82 in the lower position, the actuating button 81 allows for convenient switching between the used and unused stop mechanism 55B, and the overall structure can also be simplified.

[0064] The shape of the locking section is not limited to that of the actuating button, and a sliding element with a rotary control can also be used, and the locking receiving section is not limited to a bore hole and can also be a concave section.

[0065] The design of the rotary hammer need not be that of a DC machine, and it can also use an AC machine powered by the mains electricity supply. Naturally, the application of the present invention is not limited to a rotary hammer, and as long as the attachment of a dust collection device is possible, it can also be applied to other electrically operated tools such as an electric drill.

[0066] Dust collection with the dust collection device is also possible even if no motor or dust blower is provided on the dust collection device and the motor and blower of the electrically powered tool are used. Furthermore, the dust box need not be limited to a structure detachably attached to the main body housing; it can also be integrally formed with the main body housing, with the dust being disposed of through a lid that can be opened and closed. Explanation of reference symbols

[0067] 1, 1A: Dust collection device for an electrically driven tool, 2: Main body housing, 3: Recessed section, 4: Motor, 5: Output shaft, 6: Control device, 7: Dust blower, 9: Exhaust opening, 10: Connecting section, 11: Dust box, 12: Partition, 13: Connecting bore, 19: Guide channel, 20: Sliding section, 21: Nozzle, 22: Outer tube, 23: Inner tube, 26: Inlet opening, 29: Conduit, 32: Flexible hose, 33: Box main body, 34: Cover body, 37: Filter unit, 45: Positioning mechanism, 47: Hook, 48: Positioning knob, 50: Depth adjustment mechanism, 51: Rail, 52: Adjustment knob, 53: Mounting section, 55, 55A, 55B: Stop mechanism 56: Hook, 57: Detent pin, 59: Bearing shaft, 64: Actuating ring, 65: Convex section, 66: Stop section, 70: Rotary hammer, 71: Housing, 72: Mounting section, 80: Retaining section, 81: Actuating button, 82: Borehole, 86: Detent piece, 87: Ball, 89: Concave section, R: Dust channel

Claims

[1] Dust collection device (1A) for an electrically powered tool, comprising a main body housing (2) that can be attached to the electrically driven tool, a dust box (11) provided on the main body housing (2) in which a filter (38) is arranged, and a sliding section (20) which is provided on the main body housing (2) and which has a nozzle (21) with a suction opening (26) at a front end, wherein a dust channel (R) is formed from the suction opening (26) to the filter (38), characterized by , that the sliding section (20) is formed by several stages of pipe bodies (22, 23) which have the dust channel (R) arranged inside and whose diameter decreases towards the front, and which can be extended and retracted. a stop mechanism (55B) is provided which restricts the extension of a pipe body (23) on the small diameter side from a superposition state of adjacent pipe bodies (22), the stop mechanism (55B) comprises a detent section (81) provided on the side of the tube body (23) with a small diameter and a detent receptacle section (82) provided on the side of the tube body (22) with a large diameter, into which the detent section (81) detent, and the nozzle (21) is connected to the front end of the foremost tube body in an upward direction, wherein the locking section (81) is a sliding element (81) which is provided to be displaceable along the nozzle (21) in the up-down direction and locks into the locking receiving section (82) in the lower position. [2] Dust collection device (1A) for an electrically powered tool, comprising a main body housing (2) that can be attached to the electrically driven tool, a dust box (11) provided on the main body housing (2) in which a filter (38) is arranged, and a sliding section (20) which is provided on the main body housing (2) and which has a nozzle (21) with a suction opening (26) at a front end, wherein a dust channel (R) is formed from the suction opening (26) to the filter (38), characterized by , that the sliding section (20) is formed by several stages of pipe bodies (22, 23) which have the dust channel (R) arranged inside and whose diameter decreases towards the front, and which can be extended and retracted. a stop mechanism (55) is provided which restricts the extension of a pipe body (23) on the small diameter side from a superposition state of adjacent pipe bodies (22), the stop mechanism (55) comprises a detent section (56) provided on the side of the tube body (23) with a small diameter and a detent receiving section (57) provided on the side of the tube body (22) with a large diameter, into which the detent section (56) detent, and the locking section (56) is a hook (56) which is provided on the tube body (23) on the side with the small diameter and locks into the locking receiving section (57) from the inside of the tube body (22) on the side with the large diameter. [3] Dust collection device for an electrically driven tool according to claim 1 or 2, characterized by, that between the main body housing (2) and the tube body of the first stage, which is inserted into the main body housing (2), a positioning mechanism (45) is provided which sets an initial position of the tube body (22) in relation to the main body housing (2), and a depth adjustment mechanism (50) is provided which limits a retracted position of the tube body (22). [4] Electrically powered tool to which a dust collection device (1A) according to any one of claims 1 to 3 is attached.

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