Working machine

Abstract

To provide a technology which can inhibit damage of a hose holding member.SOLUTION: A working machine includes: a prime mover; a housing 4 that houses the prime mover; a cutting part configured to be operated by action of the prime mover and cut an object to be cut; a dust collection hose for collecting powder dust generated by the cutting part cutting the object to be cut; and a hose holding member 164 configured to hold the dust collection hose. The hose holding member 164 is attached to the housing 4 so as to be swingable about a swing axis AX5.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a work machine. [Background technology]

[0002] Patent Document 1 discloses a working machine. The working machine includes a prime mover, a housing that houses the prime mover, an electric blower that operates by the operation of the prime mover, a dust collection hose that collects dust on the floor surface by the operation of the electric blower, and a hose holding member that holds the dust collection hose. The hose holding member is attached to the housing so as not to move. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 01-097427 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described hose holding member, since the hose holding member cannot move relative to the housing, when the attitude of the work machine is changed, a force acts on the hose holding member from the dust collection hose, which may cause the hose holding member to be damaged. This specification provides a technology that can prevent the hose holding member from being damaged. [Means for solving the problem]

[0005] This specification discloses a working machine. The working machine includes a prime mover, a housing that accommodates the prime mover, a cutting unit that operates by the operation of the prime mover and cuts an object to be cut, a dust collection hose that collects dust generated by the cutting unit cutting the object to be cut, and a hose holding member that holds the dust collection hose. The hose holding member is attached to the housing so as to be swingable around a swing axis.

[0006] According to the above configuration, when the attitude of the work machine is changed, the hose holding member swings relative to the housing, thereby reducing the force acting on the hose holding member from the dust collection hose, thereby making it possible to prevent damage to the hose holding member. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a working machine 2 of a first embodiment. [Diagram 2] 1 is a side view showing the internal structure of a housing 4 of a working machine 2 of a first embodiment. [Diagram 3] FIG. 2 is a perspective view of the cutter 12, the prime mover 36, and the transmission unit 38 of the first embodiment. [Figure 4] 2 is a cross-sectional view of the vicinity of an output shaft 50 of the working machine 2 of the first embodiment. [Diagram 5] 2 is a cross-sectional view of the vicinity of a cover unit 14 of the working machine 2 of the first embodiment. [Figure 6] FIG. 2 is an exploded perspective view of the cover unit 14 of the first embodiment. [Figure 7] 1 is a side view of the working machine 2 of the first embodiment when the second movable cover 74 is pulled out from the first movable cover 70. FIG. [Figure 8] 2 is a side view of the working machine 2 of the first embodiment when the second movable cover 74 is housed in the first movable cover 70. FIG. [Figure 9] 2 is an exploded perspective view of the vicinity of a bracket 108 of the working machine 2 of the first embodiment. FIG. [Figure 10] FIG. 2 is a perspective view of an attachment tube 116 according to the first embodiment. [Figure 11] 2 is a top cross-sectional view of the vicinity of an attachment pipe 116 of the cover unit 14 of the first embodiment. FIG. [Figure 12] 2 is a cross-sectional view of the vicinity of an attachment pipe 116 of the cover unit 14 of the first embodiment. FIG. [Figure 13] 2 is a perspective view of the vicinity of a holding unit 160 of the working machine 2 of the first embodiment. FIG. [Figure 14] FIG. 2 is an exploded perspective view of the holding unit 160 of the first embodiment. [Figure 15] 3 is a cross-sectional view of a dust collection hose 16 and a holding unit 160 according to the first embodiment. FIG. [Figure 16] 4 is a cross-sectional view of a hose holding member 164 according to the first embodiment. FIG. [Figure 17] 11 is a cross-sectional view of a dust collection hose 16 and a holding unit 160 according to a second embodiment. FIG. [Figure 18] 13 is a cross-sectional view of a dust collection hose 16 and a holding unit 160 according to a third embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Representative and non-limiting examples of the present invention are described in detail below with reference to the drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Additionally, the additional features and inventions disclosed can be used separately or together with other features and inventions to provide further improved working machines.

[0009] In addition, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense, but are specifically described only to illustrate representative embodiments of the present invention. Furthermore, the various features of the following representative embodiments and the various features described in the claims do not have to be combined in the exact manner of the embodiments described herein or in the order listed in order to provide additional and useful embodiments of the present invention.

[0010] All features described in the specification and / or claims are intended to be disclosed individually and independently of one another as limitations to the specific features described in the original disclosure and claims, apart from the configuration of features described in the examples and / or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose intermediate configurations thereof as limitations to the specific features described in the original disclosure and claims.

[0011] In one or more embodiments, the hose retaining member may include a band portion that circumferentially surrounds an outer surface of the dust collection hose. When the hose retaining member is attached to the housing, the band portion may not have an opening through which the dust collection hose can traverse and exit the band portion.

[0012] According to the above configuration, the dust collection hose can be prevented from coming out of the hose holding member when the attitude of the work machine is changed.

[0013] In one or more embodiments, the hose retaining member may be removably attached to the housing.

[0014] According to the above configuration, with the hose holding member detached from the housing, the dust collection hose can be placed inside the band portion, and then the hose holding member can be attached to the housing. This makes it possible to easily attach the dust collection hose to the hose holding member.

[0015] In one or more embodiments, the hose holding member may include a band portion that circumferentially surrounds the outer surface of the dust collection hose, and a rib portion that protrudes inward from the inner surface of the band portion. The rib portion is capable of coming into contact with the outer surface of the dust collection hose when the hose holding member holds the dust collection hose.

[0016] According to the above configuration, the rib portion abuts against the outer surface of the dust collection hose, thereby making it possible to suppress movement of the dust collection hose relative to the band portion.

[0017] In one or more embodiments, the work machine may further include a base fixed to the housing. The hose retaining member may be attached to the housing via the base.

[0018] According to the above configuration, the shape of the housing can be prevented from becoming complicated.

[0019] In one or more embodiments, one of the hose holding member and the base may include a protrusion. One of the hose holding member and the base may include a receiving portion that receives the protrusion. The hose holding member may swing around a swing axis as a result of the protrusion rotating around the rotation axis within the receiving portion.

[0020] According to the above configuration, the hose holding member can be swung about the swing shaft with a simple structure.

[0021] In one or more embodiments, the axis of oscillation may coincide with the axis of rotation.

[0022] According to the above configuration, the configurations of the hose holding member and the base can be prevented from becoming complicated.

[0023] (First Example) As shown in FIG. 1, the working machine 2 is, for example, a hand-held power tool. The working machine 2 is, for example, a dry power cutter. The working machine 2 cuts a workpiece such as stone or iron. The working machine 2 includes a housing 4, a ground contact member 6, a front handle 8, an arm 10, a cutter 12, a cover unit 14, a dust collection hose 16, and two battery packs BP. Hereinafter, when the working machine 2 is placed on a placement surface P (see FIG. 2) such as the ground, the direction in which the longitudinal direction of the working machine 2 is projected onto the placement surface P is referred to as the front-rear direction, the direction perpendicular to the placement surface P is referred to as the up-down direction, and the direction perpendicular to the front-rear direction and the up-down direction is referred to as the left-right direction.

[0024] The housing 4 includes a right housing 20 that defines the outer shape of the right half of the housing 4, and a left housing 22 that defines the outer shape of the left half of the housing 4. The right housing 20 and the left housing 22 are fixed together with screws (not shown). The housing 4 includes a housing main body 24 and a rear handle 26.

[0025] As shown in Fig. 2, a battery interface 28 is provided at the rear of the housing main body 24. The battery pack BP is detachably attached to the battery interface 28 by sliding the battery pack BP in a substantially vertical direction. The battery pack BP includes, for example, a lithium ion battery. As shown in Fig. 1, when two battery packs BP are attached to the battery interface 28, the two battery packs BP are arranged side by side in the left-right direction with the battery interface 28 between them.

[0026] The rear handle 26 is disposed at the rear end of the housing body 24. The rear handle 26 extends rearward and downward from the rear surface of the housing body 24, then bends and extends downward, and then bends again and extends forward to the rear surface of the housing body 24. As shown in FIG. 2, a trigger 30 is attached to the rear handle 26. A user can rotate the cutter 12 (see FIG. 1) by pressing the trigger 30 with the fingers of the hand holding the rear handle 26.

[0027] The ground contact member 6 is attached to the lower end of the housing body 24. When the work machine 2 is placed on the placement surface P, the ground contact member 6 abuts against the placement surface P. This prevents the lower surface of the housing body 24 from coming into contact with the placement surface P.

[0028] 1 and 2, the front handle 8 is attached to the housing body 24 and the ground contact member 6. The front handle 8 extends generally above the housing body 24, then bends and extends to the left, then bends and extends generally below, and then bends again and extends to the right as far as the ground contact member 6. When cutting an object to be cut with the work machine 2, a user holds the front handle 8 with one hand and holds the rear handle 26 with the other hand.

[0029] The arm 10 is attached to the right surface of the housing body 24. The arm 10 extends from the right surface of the housing body 24, beyond the front end of the housing body 24, toward the upper front side.

[0030] As shown in Fig. 2 and Fig. 3, the work machine 2 includes a control board 34, a prime mover 36, and a transmission unit 38. As shown in Fig. 2, the control board 34 and the prime mover 36 are housed in the housing main body 24. In Fig. 2, the control board 34 is illustrated by a broken line. The control board 34 and the prime mover 36 are disposed forward of the battery interface 28. When the trigger 30 is pressed, the control board 34 operates the prime mover 36. The prime mover 36 includes, for example, an electric motor. The prime mover 36 is inclined so that the lower end is positioned forward of the upper end.

[0031] 3, the transmission unit 38 includes a reducer 40, an input shaft 42, an input pulley 44, a belt 46, an output pulley 48, and an output shaft 50. The reducer 40 transmits the rotation of the rotating shaft 36a of the prime mover 36 to the input shaft 42, and rotates the input shaft 42 at a lower rotation speed than the rotation speed of the rotating shaft 36a. The reducer 40 includes a first reduction gear 52 fixed to the rotating shaft 36a of the prime mover 36, and a second reduction gear 54 fixed to the input shaft 42. The first reduction gear 52 and the second reduction gear 54 are, for example, bevel gears.

[0032] The input shaft 42 extends in the left-right direction and is rotatable about a rotation axis AX1 that also extends in the left-right direction.

[0033] The input pulley 44, the belt 46, and the output pulley 48 are housed in the arm 10 (see FIG. 1). The input pulley 44 is disposed near the rear end of the arm 10 (see FIG. 1). The input pulley 44 is fixed to the right end of the input shaft 42. The input pulley 44 rotates together with the input shaft 42. The belt 46 is stretched between the input pulley 44 and the output pulley 48. When the input pulley 44 rotates, the belt 46 rotates in a rotation direction D1, thereby rotating the output pulley 48. The output pulley 48 is disposed near the front end of the arm 10 (see FIG. 1).

[0034] The output shaft 50 is fixed to the output pulley 48. As shown in FIG. 4, the output shaft 50 extends in the left-right direction. The output shaft 50 rotates together with the output pulley 48 around a rotation axis AX2 extending in the left-right direction. The output shaft 50 passes through the arm 10 from the output pulley 48 and protrudes to the left. The output shaft 50 is rotatably supported by the arm 10 by bearings 56 and 58. The arm 10 has a substantially cylindrical arm protruding portion 60 protruding to the left from the left surface 10a of the arm 10 at the front end of the arm 10, and the bearings 56 and 58 are fixed to the inner surface 60a of the arm protruding portion 60. The bearings 56 and 58 are, for example, ball bearings. A right clamping member 62 and a left clamping member 64 are fixed to the left end of the output shaft 50 by a bolt 66 and a washer 68. The cutter 12 is sandwiched between the right clamping member 62 and the left clamping member 64. As a result, the cutter 12 is fixed to the left end of the output shaft 50.

[0035] As shown in Fig. 5, the cutter 12 is a blade having a disk shape. A plurality of cutting edges are formed on the outer periphery of the cutter 12. The cutter 12 is, for example, a diamond cutter. The cutter 12 rotates together with the output shaft 50 around a rotation axis AX2 in a rotation direction D2.

[0036] The cover unit 14 is disposed forward of the housing body 24. The cover unit 14 partially covers the cutter 12. The cover unit 14 prevents dust generated when the cutter 12 cuts the workpiece from scattering outside the cover unit 14. As shown in FIG. 6, the cover unit 14 includes a first movable cover 70, a cover handle 72 (see FIG. 7), and a second movable cover 74.

[0037] The first movable cover 70 includes a first right movable cover 78 that defines the outer shape of the right half of the first movable cover 70, and a first left movable cover 80 that defines the outer shape of the left half of the first movable cover 70. Between the first right movable cover 78 and the first left movable cover 80, the cutter 12 (see FIG. 5) is disposed.

[0038] The first movable cover 70 includes a first covering portion 82, a first mounting portion 84, a first circumferential wall portion 86, and a discharge portion 88. The first covering portion 82 is formed on both the first right movable cover 78 and the first left movable cover 80. The first covering portion 82 partially covers the cutter 12 (see FIG. 5). When the first movable cover 70 is viewed in the left-right direction, the first covering portion 82 has a substantially semicircular shape.

[0039] The first mounting portion 84 and the first circumferential wall portion 86 are formed on the first right movable cover 78. The first mounting portion 84 and the first circumferential wall portion 86 are disposed near the center of the circle of the first covering portion 82 in the first right movable cover 78. The first mounting portion 84 has a substantially cylindrical shape. The first circumferential wall portion 86 at least partially surrounds the outer surface 84a of the first mounting portion 84. A first space 90 is defined between the first circumferential wall portion 86 and the first mounting portion 84. As shown in FIG. 4, the first mounting portion 84 is slidably attached to the arm protruding portion 60. The first mounting portion 84 surrounds the outer surface 60b of the arm protruding portion 60. When the first mounting portion 84 rotates around the outer surface 60b of the arm protruding portion 60, the first movable cover 70 rotates around the rotation axis AX2 as shown in FIG. 7 and FIG. 8. The upper limit of the rotation range of the first movable cover 70 around the rotation axis AX2 is between 30 degrees and 90 degrees, for example, 40 degrees. The orientation of the first movable cover 70 is adjusted according to the shape and position of the workpiece.

[0040] As shown in Fig. 6, the discharge portion 88 is formed in both the first right movable cover 78 and the first left movable cover 80. As shown in Fig. 5, the discharge portion 88 has a curved tubular shape. The discharge portion 88 extends along the rotation direction D2 of the cutter 12. The discharge portion 88 is disposed radially outward of the first covering portion 82. The discharge portion 88 discharges dust generated when the cutter 12 cuts the workpiece to an attachment pipe 116 described later.

[0041] As shown in Fig. 7 and Fig. 8, the cover handle 72 is attached to the first movable cover 70. A user can adjust the orientation of the first movable cover 70 by rotating the first movable cover 70 around the rotation axis AX2 by operating the cover handle 72. For example, a user can move the first movable cover 70 to the first position by pushing the cover handle 72 forward, as shown in Fig. 7. Also, a user can move the first movable cover 70 to the second position by pulling the cover handle 72 rearward, as shown in Fig. 8.

[0042] As shown in FIG. 6, the second movable cover 74 includes a second right movable cover 92 that defines the outer shape of the right half of the second movable cover 74, a second left movable cover 94 that defines the outer shape of the left half of the second movable cover 74, and rollers 96 attached to the second right movable cover 92 and the second left movable cover 94. The second right movable cover 92 and the second left movable cover 94 are disposed between the first right movable cover 78 and the first left movable cover 80. The cutter 12 (see FIG. 5) is disposed between the second right movable cover 92 and the second left movable cover 94. The rollers 96 are disposed outside the first movable cover 70. The rollers 96 rotate, for example, when they come into contact with the workpiece. This allows the working machine 2 (see FIG. 7) to move smoothly.

[0043] The second movable cover 74 includes a second covering portion 98 and a second mounting portion 100. The second covering portion 98 is formed on both the second right movable cover 92 and the second left movable cover 94. The second covering portion 98 partially covers the cutter 12 (see FIG. 5). The second covering portion 98 can be housed inside the first covering portion 82.

[0044] The second mounting portion 100 is formed on the second right movable cover 92. The second mounting portion 100 is connected to the second covering portion 98 in the second right movable cover 92. The second mounting portion 100 has a substantially cylindrical shape. An opening 102 is defined by an inner surface 100a of the second mounting portion 100. As shown in FIG. 4, the second mounting portion 100 is rotatably attached to the first mounting portion 84 by a bearing 104. The bearing 104 is, for example, a ball bearing. In a modified example, the bearing 104 may be a sliding bearing. The bearing 104 is sandwiched between the outer surface 84a of the first mounting portion 84 and the inner surface 100a of the second mounting portion 100. The second mounting portion 100 surrounds the outer surface 84a of the first mounting portion 84. The second mounting portion 100 is disposed in the first space 90 between the first mounting portion 84 and the first peripheral wall portion 86. When the second mounting portion 100 rotates around the outer surface 84a of the first mounting portion 84, the second movable cover 74 rotates around the rotation axis AX2, as shown in Figures 7 and 8. The rotation axis of the second movable cover 74 is substantially the same as the rotation axis of the first movable cover 70.

[0045] The upper limit of the rotation range of the second movable cover 74 around the rotation axis AX2 is between 30 degrees and 90 degrees, for example, 45 degrees. The orientation of the second movable cover 74 is adjusted by the user directly holding and operating the second movable cover 74, for example, the second covering part 98, with his / her hand. The second movable cover 74 rotates between a drawn-out position (see FIG. 7) and a stored position (see FIG. 8) with respect to the first movable cover 70. As shown in FIG. 7, when the second movable cover 74 is located at the drawn-out position with respect to the first movable cover 70, most of the second covering part 98 is drawn out from the inside of the first covering part 82 to the outside. The second covering part 98 partially covers the area of ​​the cutter 12 that is not surrounded by the first covering part 82. As shown in FIG. 8, when the second movable cover 74 is located at the stored position with respect to the first movable cover 70, most of the second covering part 98 is stored inside the first covering part 82. Therefore, the area covering the cutter 12 is substantially the same as the area covering the cutter 12 by the first movable cover 70 .

[0046] As shown in FIG. 9, the cover unit 14 further includes a bracket 108. The bracket 108 has a generally circular plate shape with an opening 110 at the center. The bracket 108 is fixed to the left surface of the arm protruding portion 60 by a screw 112. As shown in FIG. 4, the bracket 108 is disposed between the cutter 12 and the arm protruding portion 60 in the left-right direction. The first mounting portion 84, the first peripheral wall portion 86, and the second mounting portion 100 are disposed between the left surface 10a of the arm 10 and the bracket 108. This allows the first movable cover 70 and the second movable cover 74 to be attached to the arm 10. The output shaft 50 is inserted into the opening 110. The diameter of the bracket 108 is larger than the diameter of the outer surface 84a of the first mounting portion 84, the diameter of the inner surface 100a of the second mounting portion 100 (the diameter of the opening 102), and the diameter of the inner surface of the first peripheral wall portion 86. The bracket 108 overlaps with the first mounting portion 84, the second mounting portion 100, and the first peripheral wall portion 86 in the left-right direction. As a result, the bracket 108 blocks the first space 90 between the first mounting portion 84 and the first peripheral wall portion 86 from the left side. When dust is generated by the cutter 12 cutting the workpiece, the bracket 108 suppresses the dust from entering the first space 90, for example, the space between the first mounting portion 84 and the second mounting portion 100, or the space between the second mounting portion 100 and the first peripheral wall portion 86. As a result, it is possible to suppress the dust from entering the bearing 104, and to suppress the second movable cover 74 from being unable to rotate relative to the first movable cover 70.

[0047] As shown in FIG. 6, the cover unit 14 further includes an attachment tube 116. The attachment tube 116 is made of, for example, a resin material. In a modified example, the attachment tube 116 may be made of a metal material. The attachment tube 116 is attached to the discharge portion 88 rotatably around the rotation axis AX3 by being sandwiched between the first right movable cover 78 and the first left movable cover 80. The rotation axis AX3 and the rotation axis AX2 are in a twisted position. The attachment tube 116 is detachably attached to the dust collection hose 16 (see FIG. 7). The attachment tube 116 has a curved tubular shape. Since the attachment tube 116 is rotatable, the user can easily attach the dust collection hose 16 to the attachment tube 116 by rotating the attachment tube 116 to a predetermined position. The attachment tube 116 sends the dust discharged from the discharge portion 88 to the dust collection hose 16. The dust sent to the dust collection hose 16 is collected in a dust collector (not shown).

[0048] As shown in FIG. 10, the attachment pipe 116 includes a cover attachment portion 118, a curved portion 120, and a hose attachment portion 122. The cover attachment portion 118 extends linearly along the rotation axis AX3. The cover attachment portion 118 is attached to the discharge portion 88 (see FIG. 6). The curved portion 120 extends in a curved manner. The curved portion 120 connects the cover attachment portion 118 and the hose attachment portion 122. The hose attachment portion 122 extends linearly. The hose attachment portion 122 is inclined with respect to the rotation axis AX3. The hose attachment portion 122 is attached to the dust collection hose 16 (see FIG. 1) by inserting the dust collection hose 16. In addition, the dust collection hose 16 is detachably attached to the hose attachment portion 122. When the dust collection hose 16 is not attached to the hose attachment portion 122, a cap (not shown) is attached to the hose attachment portion 122. When the cap is attached to the hose attachment portion 122, dust is prevented from being discharged from the hose attachment portion 122.

[0049] The cover mounting portion 118 includes a flange portion 124, a first receiving portion 126, and a second receiving portion 128. The flange portion 124 is disposed near a connection point between the cover mounting portion 118 and the curved portion 120. The flange portion 124 protrudes outward from the outer surface of the cover mounting portion 118. The flange portion 124 extends around the outer surface of the cover mounting portion 118 around the rotation axis AX3. The first receiving portion 126 is recessed inward from the outer surface of the cover mounting portion 118. The first receiving portion 126 extends around the outer surface of the cover mounting portion 118 around the rotation axis AX3.

[0050] The second receiving portion 128 is disposed between the flange portion 124 and the first receiving portion 126. The second receiving portion 128 extends around the outer surface of the cover mounting portion 118 so as to go around the rotation axis AX3. The second receiving portion 128 includes a first portion receiving portion 130 recessed inwardly by a first depth from the outer surface of the cover mounting portion 118, and a second portion receiving portion 132 recessed inwardly by a second depth from the outer surface of the cover mounting portion 118. One end of the first portion receiving portion 130 around the rotation axis AX3 is connected to one end of the second portion receiving portion 132 around the rotation axis AX3, and the other end of the first portion receiving portion 130 around the rotation axis AX3 is connected to the other end of the second portion receiving portion 132 around the rotation axis AX3. The first depth is shallower than the second depth. As shown in FIG. 11, a first step portion 134 is formed at the connection point between one end of the first portion receiving portion 130 and one end of the second portion receiving portion 132, and a second step portion 136 is formed at the connection point between the other end of the first portion receiving portion 130 and the other end of the second portion receiving portion 132.

[0051] Before describing the attachment structure between the attachment tube 116 and the discharge portion 88, the discharge portion 88 will be described in detail. As shown in Fig. 12, the discharge portion 88 includes a stopper portion 140 and a rib portion 142. The stopper portion 140 and the rib portion 142 are disposed at the outlet 88a of the discharge portion 88. The stopper portion 140 protrudes radially inward from the inner surface of the discharge portion 88. The stopper portion 140 extends around the inner surface of the discharge portion 88 around the rotation axis AX3.

[0052] The rib portion 142 is disposed near the end of the outlet 88a side of the discharge portion 88 relative to the stopper portion 140. The rib portion 142 extends around the inner surface of the discharge portion 88 around the rotation axis AX3. As shown in FIG. 11, the rib portion 142 includes a first partial rib portion 144 protruding radially inward from the inner surface of the discharge portion 88 by a first height, and a second partial rib portion 146 protruding radially inward from the inner surface of the discharge portion 88 by a second height. In FIG. 11, the inner surface of the discharge portion 88 is illustrated by a broken line. One end of the first partial rib portion 144 around the rotation axis AX3 is connected to one end of the second partial rib portion 146 around the rotation axis AX3, and the other end of the first partial rib portion 144 around the rotation axis AX3 is connected to the other end of the second partial rib portion 146 around the rotation axis AX3. The first height is lower than the second height. A first rib step portion 148 is formed at the connection point between one end of the first partial rib portion 144 and one end of the second partial rib portion 146, and a second rib step portion 150 is formed at the connection point between the other end of the first partial rib portion 144 and the other end of the second partial rib portion 146.

[0053] As shown in FIG. 12, when the attachment tube 116 is attached to the discharge portion 88, the cover attachment portion 118 is inserted into the discharge portion 88. The flange portion 124 abuts against the outlet 88a of the discharge portion 88 from the outside of the discharge portion 88. The end of the cover attachment portion 118 faces the stopper portion 140. An O-ring 152 is attached to the first receiving portion 126, and the O-ring 152 seals between the outer surface of the cover attachment portion 118 and the inner surface of the discharge portion 88. The rib portion 142 is received in the second receiving portion 128. This prevents the attachment tube 116 from slipping out of the discharge portion 88. As shown in FIG. 11, the rib portion 142 can move around the rotation axis AX3 inside the second receiving portion 128. When the rib portion 142 moves in the positive direction D3 within the second receiving portion 128 and the first step portion 134 abuts against the first rib step portion 148, the rib portion 142 cannot move further in the positive direction D3 within the second receiving portion 128. Also, when the rib portion 142 moves in the negative direction D4 opposite to the positive direction D3 within the second receiving portion 128 and the second step portion 136 abuts against the second rib step portion 150, the rib portion 142 cannot move further in the negative direction D4 within the second receiving portion 128. This limits the rotation of the attachment tube 116 around the rotation axis AX3.

[0054] The upper limit of the rotation range A1 of the attachment tube 116 around the rotation axis AX3 is, for example, 10 degrees or more, for example, 20 degrees or more, for example, 30 degrees or more, for example, 40 degrees or more. This prevents interference between the housing 4 (see FIG. 1) and the dust collection hose 16 (see FIG. 1) connected to the attachment tube 116. When the upper limit of the rotation range A1 of the attachment tube 116 around the rotation axis AX3 is 30 degrees or more, interference between the housing 4 and the dust collection hose 16 is further prevented. In addition, the upper limit of the rotation range A1 of the attachment tube 116 around the rotation axis AX3 is, for example, 90 degrees or less, for example, 80 degrees or less, for example, 70 degrees or less, for example, 60 degrees or less. This prevents the dust collection hose 16 from contacting the cutter 12 (see FIG. 1). When the upper limit of the rotation range A1 of the attachment tube 116 around the rotation axis AX3 is 70 degrees or less, contact between the dust collection hose 16 and the cutter 12 is further prevented.

[0055] When the first step portion 134 abuts against the first rib step portion 148, the orientation of the attachment tube 116 relative to the first movable cover 70 is forward facing with the hose attachment portion 122 facing the front side as shown in FIG. 8, and when the second step portion 136 abuts against the second rib step portion 150, the orientation of the attachment tube 116 relative to the first movable cover 70 is rear facing with the hose attachment portion 122 facing the rear side as shown in FIG. 7. When the attachment tube 116 relative to the first movable cover 70 faces forward as shown in FIG. 8, even if the first movable cover 70 is located at the second position, the housing 4 and the dust collection hose 16 are unlikely to interfere with each other. Also, when the attachment tube 116 relative to the first movable cover 70 faces backward as shown in FIG. 7, even if the first movable cover 70 is located at the first position, the dust collection hose 16 is unlikely to come into contact with the cutter 12.

[0056] As shown in FIG. 13, in order to prevent the dust collection hose 16 (see FIG. 1) from coming off the housing 4 when the work machine 2 is working, the work machine 2 further includes a holding unit 160. The holding unit 160 holds the dust collection hose 16. The holding unit 160 is disposed near the rear end of the housing 4. The holding unit 160 is disposed on the right surface of the housing 4. This makes it possible to prevent the user from bumping into the dust collection hose 16 when standing on the left side of the work machine 2 and operating the work machine 2.

[0057] The holding unit 160 includes a base 162 and a hose holding member 164. The base 162 is made of a resin material. In a modified example, the base 162 may be made of a metal material. The base 162 includes a bottom wall 166 and a pair of opposing walls 168, 170. Hereinafter, the pair of opposing walls 168, 170 may be referred to as the upper opposing wall 168 and the lower opposing wall 170, respectively. The bottom wall 166 is fixed to the housing 4 by a screw 172.

[0058] As shown in FIG. 14, the upper opposing wall 168 protrudes from the upper end of the bottom wall 166 in a direction perpendicular to the bottom wall 166 (to the right). The lower opposing wall 170 protrudes from the lower end of the bottom wall 166 in a direction perpendicular to the bottom wall 166 (to the right). The pair of opposing walls 168, 170 are arranged opposite each other in the vertical direction. The upper opposing wall 168 has an upper receiving portion 174 penetrating the upper opposing wall 168 in the thickness direction (vertical direction). The lower opposing wall 170 has a lower receiving portion 176 penetrating the lower opposing wall 170 in the thickness direction (vertical direction). The upper receiving portion 174 is arranged opposite the lower receiving portion 176 in the vertical direction. The upper receiving portion 174 and the lower receiving portion 176 are arranged on a rotation axis AX4 extending in the vertical direction.

[0059] The hose holding member 164 is made of a resin material. In a modified example, the hose holding member 164 may be made of a metal material. The hose holding member 164 is detachably attached to the base 162. The hose holding member 164 includes a band portion 180, a rib portion 182, an upper connecting portion 184, a lower connecting portion 186, an upper protruding portion 188, and a lower protruding portion 190. The band portion 180 has a partially interrupted ring shape. One end of the band portion 180 in the longitudinal direction is separated from the other end of the band portion 180 in the longitudinal direction. As shown in FIG. 15, the band portion 180 surrounds the outer surface of the dust collection hose 16 in the circumferential direction of the outer surface. The band portion 180 holds the dust collection hose 16. The band portion 180 is elastically deformable so that one end of the band portion 180 in the longitudinal direction approaches the other end of the band portion 180 in the longitudinal direction, and so that one end of the band portion 180 in the longitudinal direction moves away from the other end of the band portion 180 in the longitudinal direction.

[0060] The rib portion 182 protrudes from the inner surface 180a of the band portion 180 toward the radial inside of the band portion 180 by a third height. This can increase the rigidity of the hose holding member 164. In FIG. 15, the inner surface 180a of the band portion 180 is illustrated by a broken line. The third height is 1 mm to 10 mm, for example, 3 mm. The rib portion 182 extends along the longitudinal direction of the band portion 180. As shown in FIG. 16, the rib portion 182 is disposed at the center position of the band portion 180 in the width direction (front-rear direction). The width of the rib portion 182 in the front-rear direction is 1 mm to 5 mm, for example, 2 mm. The rib portion 182 can abut against the outer surface of the dust collection hose 16. The rib portion 182 abuts against the outer surface of the dust collection hose 16, thereby suppressing the dust collection hose 16 from moving relative to the hose holding member 164. In FIG. 16, the outer surface of the dust collection hose 16 is illustrated by a broken line. Furthermore, when the dust collection hose 16 is a bellows hose, the dust collection hose 16 has a plurality of protrusions 16a arranged on the outer surface of the dust collection hose 16 in the longitudinal direction of the dust collection hose 16. The width of the rib portion 182 is smaller than the distance between adjacent protrusions 16a. The rib portion 182 can be inserted between adjacent protrusions 16a. By inserting the rib portion 182 between adjacent protrusions 16a, movement of the dust collection hose 16 relative to the hose holding member 164 can be further suppressed.

[0061] As shown in FIG. 15, the upper connection part 184 is connected to one end of the band part 180 in the longitudinal direction. The lower connection part 186 is connected to the other end of the band part 180 in the longitudinal direction. The upper connection part 184 is disposed away from the lower connection part 186 in the vertical direction. The vertical length between the upper connection part 184 and the lower connection part 186 is shorter than the diameter of the dust collection hose 16. The lower surface 184a of the upper connection part 184 faces the upper surface 186a of the lower connection part 186. An attachment opening 192 is defined between the lower surface 184a of the upper connection part 184 and the upper surface 186a of the lower connection part 186.

[0062] The upper protrusion 188 and the lower protrusion 190 are disposed on a swing axis AX5 extending in the vertical direction. The upper protrusion 188 protrudes from an upper surface 184b of the upper connection portion 184 in a direction (upward) away from the upper connection portion 184. The upper protrusion 188 has a generally cylindrical shape corresponding to the upper receiving portion 174. The upper protrusion 188 is received in the upper receiving portion 174 by being inserted into the upper receiving portion 174 from below. The lower protrusion 190 protrudes from a lower surface 186b of the lower connection portion 186 in a direction (downward) away from the lower connection portion 186. The lower protrusion 190 has a generally cylindrical shape corresponding to the lower receiving portion 176. The lower protrusion 190 is received in the lower receiving portion 176 by being inserted into the lower receiving portion 176 from above. When the upper protrusion 188 is received in the upper receiving portion 174 and the lower protrusion 190 is received in the lower receiving portion 176, the mounting opening 192 is closed by the bottom wall 166 of the base 162. This makes it possible to prevent the dust collection hose 16 from passing through the mounting opening 192 and coming out of the band portion 180 so as to cross the band portion 180. In addition, when the upper protrusion 188 is received in the upper receiving portion 174 and the lower protrusion 190 is received in the lower receiving portion 176, the hose holding member 164 can swing around the swing axis AX5 relative to the base 162. Therefore, when the attitude of the work machine 2 (see FIG. 13) is changed, the hose holding member 164 can swing relative to the housing 4 (see FIG. 13) in accordance with the direction of the dust collection hose 16. This reduces the force acting on the hose holding member 164 from the dust collection hose 16, as compared to a configuration in which the hose holding member 164 cannot move relative to the housing 4. The oscillation axis AX5 coincides with the rotation axis AX4.

[0063] A method of attaching the dust collection hose 16 to the holding unit 160 will be described with reference to Figs. 13 and 14. First, the band portion 180 shown in Fig. 13 is gripped by a user, and the band portion 180 is bent so that the upper connecting portion 184 and the lower connecting portion 186 approach each other. The upper protrusion 188 is pulled out from the upper receiving portion 174, and the lower protrusion 190 is pulled out from the lower receiving portion 176, whereby the hose holding member 164 is removed from the base 162 as shown in Fig. 14. Next, the dust collection hose 16 (see Fig. 13) is pushed into the band portion 180 from the mounting opening 192 by the user. Next, the band portion 180 is gripped by a user, and the band portion 180 is bent so that the upper connecting portion 184 and the lower connecting portion 186 approach each other. Finally, the user inserts the upper protrusion 188 into the upper receiving portion 174, and the lower protrusion 190 into the lower receiving portion 176. As a result, as shown in Fig. 13, the hose holding member 164 is attached to the housing 4 via the base 162 with the dust collection hose 16 held by the holding unit 160. In this state, as shown in Fig. 15, the entire circumference of the outer surface of the dust collection hose 16 in the circumferential direction is surrounded by the band portion 180, the upper connecting portion 184, the lower connecting portion 186, and the bottom wall 166 (housing 4).

[0064] (effect) The work machine 2 of this embodiment includes a prime mover 36, a housing 4 that accommodates the prime mover 36, a cutter 12 (an example of a cutting section) that is operated by the operation of the prime mover 36 and cuts an object to be cut, a dust collection hose 16 for collecting dust generated by the cutter 12 cutting the object to be cut, and a hose holding member 164 that holds the dust collection hose 16. The hose holding member 164 is attached to the housing 4 so as to be swingable around a swing axis AX5.

[0065] According to the above configuration, when the attitude of the work machine 2 is changed, the hose holding member 164 swings relative to the housing 4, thereby reducing the force acting on the hose holding member 164 from the dust collection hose 16. This makes it possible to prevent the hose holding member 164 from being damaged.

[0066] Moreover, the hose holding member 164 includes a band portion 180 that circumferentially surrounds the outer surface of the dust collection hose 16. When the hose holding member 164 is attached to the housing 4, the band portion 180 does not have an opening through which the dust collection hose 16 crosses the band portion 180 and exits from the band portion 180.

[0067] According to the above configuration, it is possible to prevent the dust collection hose 16 from coming out of the hose holding member 164 when the attitude of the work machine 2 is changed.

[0068] Moreover, the hose holding member 164 is detachably attached to the housing 4 .

[0069] According to the above configuration, with the hose holding member 164 removed from the housing 4, the dust collection hose 16 can be placed inside the band portion 180, and then the hose holding member 164 can be attached to the housing 4. This makes it possible to easily attach the dust collection hose 16 to the hose holding member 164.

[0070] Furthermore, the hose holding member 164 includes a band portion 180 that surrounds the outer surface of the dust collection hose 16 in the circumferential direction of the outer surface, and a rib portion 182 that protrudes inward from an inner surface 180a of the band portion 180. The rib portion 182 is capable of coming into contact with the outer surface of the dust collection hose 16 when the hose holding member 164 holds the dust collection hose 16.

[0071] According to the above configuration, the rib portion 182 abuts against the outer surface of the dust collection hose 16 , so that the dust collection hose 16 can be prevented from moving relative to the band portion 180 .

[0072] The work machine 2 further includes a base 162 fixed to the housing 4. The hose holding member 164 is attached to the housing 4 via the base 162.

[0073] According to the above configuration, it is possible to prevent the shape of the housing 4 from becoming complicated.

[0074] One of the hose holding member 164 and the base 162 has an upper protruding portion 188 (an example of a protruding portion). One of the hose holding member 164 and the base 162 has an upper receiving portion 174 (an example of a receiving portion) that receives the upper protruding portion 188. The upper protruding portion 188 rotates within the upper receiving portion 174 about the rotation axis AX4, causing the hose holding member 164 to swing about the swing axis AX5.

[0075] According to the above-mentioned configuration, the hose holding member 164 can be swung about the swing axis AX5 with a simple structure.

[0076] Furthermore, the oscillation axis AX5 may coincide with the rotation axis AX4.

[0077] According to the above configuration, the configurations of the hose holding member 164 and the base 162 can be prevented from becoming complicated.

[0078] (Second Example) A second embodiment will be described with reference to FIG. 17. In the second embodiment, only the differences from the first embodiment will be described. In the second embodiment, the configuration of the hose holding member 164 is different from that of the hose holding member 164 in the first embodiment. In the second embodiment, a stopper portion 200 is connected to the upper end of the upper protrusion 188. The stopper portion 200 prevents the upper protrusion 188 from slipping out of the upper receiving portion 174. That is, one end of the hose holding member 164 in the longitudinal direction is attached to the base 162 in an undetachable manner, and the other end of the hose holding member 164 in the longitudinal direction is attached to the base 162 in an detachable manner. This makes it possible to prevent the hose holding member 164 from being lost. In a modified example, the stopper portion 200 may be connected to the lower end of the lower protrusion 190 to prevent the lower protrusion 190 from slipping out of the lower receiving portion 176.

[0079] When attaching the dust collection hose 16 to the holding unit 160, the band portion 180 is gripped by the user, and the band portion 180 is bent so that the upper connection portion 184 and the lower connection portion 186 approach each other. The lower protrusion 190 is pulled out of the lower receiving portion 176, and the other end of the hose holding member 164 in the longitudinal direction is removed from the base 162. Next, the dust collection hose 16 is pushed into the band portion 180 from the mounting opening 192 by the user. Next, the band portion 180 is gripped by the user, and the band portion 180 is bent so that the upper connection portion 184 and the lower connection portion 186 approach each other. Finally, the lower protrusion 190 is inserted into the lower receiving portion 176 by the user. As a result, the hose holding member 164 is attached to the housing 4 via the base 162 with the dust collection hose 16 held by the holding unit 160.

[0080] (Third Example) A third embodiment will be described with reference to FIG. 18. In the third embodiment, only the points different from the first embodiment will be described. In the third embodiment, the configuration of the hose holding member 164 is different from the configuration of the hose holding member 164 in the first embodiment. In the third embodiment, an upper stopper portion 300 is connected to the upper end of the upper protrusion 188. The upper stopper portion 300 prevents the upper protrusion 188 from slipping out of the upper receiving portion 174. A lower stopper portion 302 is connected to the lower end of the lower protrusion 190. The lower stopper portion 302 prevents the lower protrusion 190 from slipping out of the lower receiving portion 176. That is, the hose holding member 164 is attached to the base 162 in an undetachable manner. This makes it possible to prevent the hose holding member 164 from being lost.

[0081] The band portion 180 includes an upper band portion 304 and a lower band portion 306. The upper band portion 304 is disposed vertically apart from the lower band portion 306. The upper band portion 304 is not connected to the lower band portion 306. That is, the hose holding member 164 is made up of two parts. One end 308 of the upper band portion 304 is connected to the upper connecting portion 184. One end 310 of the lower band portion 306 is connected to the lower connecting portion 186. An attachment opening 316 is defined between the other end 312 of the upper band portion 304 and the other end 314 of the lower band portion 306. The rib portion 182 is formed on each of an inner surface 318 of the upper band portion 304 and an inner surface 320 of the lower band portion 306.

[0082] When attaching the dust collection hose 16 to the holding unit 160, the dust collection hose 16 is pushed by the user into between the upper band portion 304 and the lower band portion 306 from the attachment opening 316. This causes the dust collection hose 16 to be held by the holding unit 160. In this state, when the dust collection hose 16 moves relative to the housing 4 (see FIG. 13), the hose holding member 164 swings around the swing axis AX5. The orientation of the hose holding member 164 is adjusted as the dust collection hose 16 moves. This makes it possible to prevent the dust collection hose 16 from slipping out of the hose holding member 164 and crossing the band portion 180 through the attachment opening 316.

[0083] (Modification) The work machine 2 according to one embodiment may be a concrete chainsaw or a grinder.

[0084] In one embodiment, the prime mover 36 may be an engine.

[0085] The work machine 2 according to one embodiment may include a power cord instead of the battery pack BP. In this case, power is supplied to the prime mover 36 by connecting the power cord to an external power source.

[0086] The position of the holding unit 160 is not limited to the right surface of the housing 4. The holding unit 160 according to an embodiment may be disposed on the left surface of the housing 4 or on the upper surface of the housing 4. Moreover, the holding unit 160 according to an embodiment may be disposed in the vicinity of the front end of the housing 4.

[0087] In one embodiment, the base 162 may be integrally formed with the housing 4 .

[0088] In one embodiment of the base 162 and hose holding member 164, the upper protrusion 188 may protrude from the upper opposing wall 168 of the base 162, and the lower protrusion 190 may protrude from the lower opposing wall 170 of the base 162. In this case, the upper receiving portion 174 is formed in the upper connecting portion 184 of the hose holding member 164, and the lower receiving portion 176 is formed in the lower connecting portion 186 of the hose holding member 164.

[0089] In one embodiment, the second receiving portion 128 may be formed in the discharge portion 88. In this case, the rib portion 142 is formed in the attachment tube . [Explanation of symbols]

[0090] 2: Work equipment 4: Housing 10: Arm 12: Cutter 14: Cover unit 16: Dust collection hose 36: Prime mover 38: Transmission unit 50: Output shaft 60: Arm protrusion 70: First movable cover 74: Second movable cover 84: First mounting part 86: 1st peripheral wall part 88: Discharge section 88a:Exit 100: Second mounting part 108: Bracket 116: Mounting tube 128:Second reception department 134: First step 136: Second step 142: Rib section 160: Holding unit 162: Bass 164: Hose retaining member 174: Upper receiving part 176:Lower receiving part 180: Band 180a: Inner surface 182: Rib section 184: Upper connection part 186: Lower connection part 188: Upper protrusion 190: Lower protrusion 316: Installation opening A1: Rotation range AX1, AX2, AX4: Rotation axis AX3: Rotating axis AX5: Swing axis BP: Battery pack D1: Rotation direction D2: Rotation direction D3: Positive direction D4: Negative direction P: Placement surface

Claims

1. The prime mover, a housing that accommodates the prime mover; A cutting unit that is operated by the operation of the prime mover and cuts a workpiece; a dust collection hose for collecting dust generated when the cutting unit cuts the workpiece; A hose holding member for holding the dust collection hose, The hose holding member is attached to the housing so as to be swingable around a swing shaft.

2. The hose holding member includes a band portion that surrounds an outer surface of the dust collection hose in a circumferential direction of the outer surface, 2. The work machine according to claim 1, wherein, in a state in which the hose holding member is attached to the housing, the band portion does not have an opening through which the dust collection hose crosses the band portion and exits from the band portion.

3. The work machine according to claim 2 , wherein the hose holding member is detachably attached to the housing.

4. The hose holding member is A band portion that surrounds an outer surface of the dust collection hose in a circumferential direction of the outer surface; A rib portion protruding inward from the inner surface of the band portion, The work machine according to claim 1 , wherein the rib portion is capable of coming into contact with the outer surface of the dust-collection hose when the hose holding member holds the dust-collection hose.

5. a base secured to the housing; The work machine according to claim 1 , wherein the hose holding member is attached to the housing via the base.

6. One of the hose retaining member and the base includes a protrusion, One of the hose holding member and the base has a receiving portion that receives the protrusion, The work machine according to claim 5 , wherein the hose holding member swings about the swing axis as a result of the projection rotating about the rotation axis within the receiving portion.

7. The work machine according to claim 6 , wherein the pivot axis coincides with the rotation axis.

Images