Work equipment

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 working machine.

Background Art

[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 collecting hose for collecting dust on the floor surface by the operation of the electric blower, and a hose holding member that holds the dust collecting hose. The hose holding member is immovably attached to the housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the hose holding member as described above, since the hose holding member is immovable with respect to the housing, when the posture of the working machine is changed, a force acts on the hose holding member from the dust collecting hose, and the hose holding member may be damaged. This specification provides a technology capable of suppressing damage to the hose holding member.

Means for Solving the Problems

[0005] This specification discloses a working machine. The working machine includes a prime mover, a housing that houses the prime mover, a cutting unit that operates by the operation of the prime mover and cuts a workpiece, a dust collecting hose for collecting dust generated when the cutting unit cuts the workpiece, and a hose holding member that holds the dust collecting 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 posture of the work machine is changed, the hose holding member swings relative to the housing, thereby reducing the force acting from the dust collection hose to the hose holding member. This helps to prevent damage to the hose holding member. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of the work machine 2 of the first embodiment. [Figure 2] This is a side view showing the internal structure of the housing 4 of the work machine 2 of the first embodiment. [Figure 3] This is a perspective view of the cutter 12, prime mover 36, and transmission unit 38 of the first embodiment. [Figure 4] This is a cross-sectional view of the vicinity of the output shaft 50 of the work machine 2 of the first embodiment. [Figure 5] This is a cross-sectional view of the vicinity of the cover unit 14 of the work machine 2 of the first embodiment. [Figure 6] This is an exploded perspective view of the cover unit 14 of the first embodiment. [Figure 7] This is a side view of the work machine 2 of the first embodiment, when the second movable cover 74 is pulled out from the first movable cover 70. [Figure 8] This is a side view of the work machine 2 of the first embodiment, when the second movable cover 74 is housed in the first movable cover 70. [Figure 9] This is an exploded perspective view of the vicinity of the bracket 108 of the work machine 2 of the first embodiment. [Figure 10] This is a perspective view of the mounting pipe 116 of the first embodiment. [Figure 11] This is an upper cross-sectional view of the cover unit 14 near the mounting pipe 116 of the first embodiment. [Figure 12] This is a cross-sectional view of the cover unit 14 near the mounting pipe 116 of the first embodiment. [Figure 13] This is a perspective view of the vicinity of the holding unit 160 of the work machine 2 in the first embodiment. [Figure 14] This is an exploded perspective view of the holding unit 160 of the first embodiment. [Figure 15] This is a cross-sectional view of the dust collection hose 16 and holding unit 160 of the first embodiment. [Figure 16] This is a cross-sectional view of the hose holding member 164 of the first embodiment. [Figure 17] This is a cross-sectional view of the dust collection hose 16 and holding unit 160 of the second embodiment. [Figure 18] This is a cross-sectional view of the dust collection hose 16 and holding unit 160 of the third embodiment. [Modes for carrying out the invention]

[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 show those skilled in the art details for carrying out preferred examples of the present invention and is not intended to limit the scope of the invention. Furthermore, the disclosed additional features and inventions may be used separately from or in conjunction with other features and inventions to provide a further improved work machine.

[0009] Furthermore, the combinations of features and processes disclosed in the following detailed description are not essential for carrying out the present invention in the broadest sense, and are described solely to illustrate representative examples of the present invention. Moreover, the various features of the following representative examples, as well as the various features described in the claims, do not necessarily have to be combined in the same way as the examples described herein, or in the order listed, to provide additional and useful embodiments of the present invention.

[0010] All features described in this specification and / or the claims are intended to be disclosed separately and independently of each other, as limitations to the initial disclosure and the specific matters described in the claims, apart from the configuration of the features described in the embodiments and / or the claims. Further, all descriptions regarding numerical ranges and groups or collectives are made with the intention of disclosing intermediate configurations as limitations to the initial disclosure and the specific matters described in the claims.

[0011] In one or more embodiments, the hose holding member may include a band portion that surrounds the outer surface of the dust collection hose in the circumferential direction of the outer surface. In a state where the hose holding member is attached to the housing, the band portion may not have an opening through which the dust collection hose crosses the band portion and exits from the band portion.

[0012] According to the above configuration, when the posture of the working machine is changed, it is possible to suppress the dust collection hose from coming out of the hose holding member.

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

[0014] According to the above configuration, in a state where the hose holding member is removed from the housing, the dust collection hose can be disposed inside the band portion, and then the hose holding member can be attached to the housing. Thereby, the dust collection hose can be easily attached to the hose holding member.

[0015] In one or more embodiments, the hose holding member may include a band portion that surrounds the outer surface of the dust collection hose in the circumferential direction of the outer surface, and a rib portion that protrudes inward from the inner surface of the band portion. The rib portion can be in contact with the outer surface of the dust collection hose when the hose holding member holds the dust collection hose.

[0016] With the above configuration, the rib portion comes into contact with the outer surface of the dust collection hose, thereby preventing the dust collection hose from moving relative to the band portion.

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

[0018] The above configuration helps to prevent the housing shape from becoming overly complex.

[0019] In one or more embodiments, one of the hose retaining member and the base may have a projection. The one of the hose retaining member and the base may have a receiving portion for receiving the projection. The hose retaining member may oscillate around a pivot axis as the projection rotates around a pivot axis within the receiving portion.

[0020] With the above configuration, the hose holding member can be swung around the pivot axis with a simple structure.

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

[0022] The above configuration helps to prevent the hose holding member and base from becoming overly complex.

[0023] (First embodiment) As shown in Figure 1, the workpiece 2 is, for example, a handheld power tool. The workpiece 2 is, for example, a dry-type power cutter. The workpiece 2 cuts materials such as stone or iron. The workpiece 2 comprises a housing 4, a grounding 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 workpiece 2 is placed on a mounting surface P (see Figure 2) such as the ground, the direction obtained by projecting the longitudinal direction of the workpiece 2 onto the mounting surface P will be called the front-rear direction, the direction perpendicular to the mounting surface P will be called the up-down direction, and the direction perpendicular to the front-rear direction and the up-down direction will be called the left-right direction.

[0024] Housing 4 comprises a right-side housing 20 that defines the external shape of the right half of housing 4, and a left-side housing 22 that defines the external shape of the left half of housing 4. The right-side housing 20 and the left-side housing 22 are fixed together by screws (not shown). Housing 4 comprises a housing body 24 and a rear handle 26.

[0025] As shown in Figure 2, a battery interface 28 is provided at the rear of the housing 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 comprises, for example, a lithium-ion battery. As shown in Figure 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, flanking the battery interface 28.

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

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

[0028] As shown in Figures 1 and 2, the front handle 8 is attached to the housing body 24 and the grounding member 6. The front handle 8 extends approximately above the housing body 24, then bends to the left, then bends approximately below, and then bends further to the right to the grounding member 6. When the user cuts the workpiece with the work machine 2, they grasp the front handle 8 with one hand and the rear handle 26 with the other hand.

[0029] The arm 10 is attached to the right side of the housing body 24. The arm 10 extends from the right side of the housing body 24, over the front end of the housing body 24, and toward the front and upward.

[0030] As shown in Figures 2 and 3, the work machine 2 comprises a control board 34, a prime mover 36, and a transmission unit 38. As shown in Figure 2, the control board 34 and the prime mover 36 are housed in the housing body 24. In Figure 2, the control board 34 is shown by a dashed line. The control board 34 and the prime mover 36 are located in front of the battery interface 28. When the trigger 30 is pressed, the control board 34 operates the prime mover 36. The prime mover 36 is equipped with, for example, an electric motor. The prime mover 36 is inclined such that its lower end is located in front of its upper end.

[0031] As shown in Figure 3, the transmission unit 38 includes a reduction gear 40, an input shaft 42, an input pulley 44, a belt 46, an output pulley 48, and an output shaft 50. The reduction gear 40 transmits the rotation of the rotating shaft 36a of the prime mover 36 to the input shaft 42, causing the input shaft 42 to rotate at a lower rotational speed than the rotational speed of the rotating shaft 36a. The reduction gear 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. The input shaft 42 is rotatable around the rotation axis AX1 which extends in the left-right direction.

[0033] The input pulley 44, belt 46, and output pulley 48 are housed in the arm 10 (see Figure 1). The input pulley 44 is located near the rear end of the arm 10 (see Figure 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. The belt 46 rotates in the rotational direction D1 when the input pulley 44 rotates, thereby rotating the output pulley 48. The output pulley 48 is located near the front end of the arm 10 (see Figure 1).

[0034] The output shaft 50 is fixed to the output pulley 48. As shown in Figure 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 that extends in the left-right direction. The output shaft 50 protrudes to the left from the output pulley 48, passing through the arm 10. The output shaft 50 is rotatably supported by the arm 10 by bearings 56 and 58. At the front end of the arm 10, there is a substantially cylindrical arm projection 60 that protrudes to the left from the left surface 10a of the arm 10, and the bearings 56 and 58 are fixed to the inner surface 60a of the arm projection 60. The bearings 56 and 58 are, for example, ball bearings. A right-side clamping member 62 and a left-side clamping member 64 are fixed to the left end of the output shaft 50 by bolts 66 and washers 68. The right-side clamping member 62 and the left-side clamping member 64 hold the cutter 12 in place. This fixes the cutter 12 to the left end of the output shaft 50.

[0035] As shown in Figure 5, the cutter 12 is a disc-shaped blade. Multiple 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 in the rotational direction D2 around the rotation axis AX2 together with the output shaft 50.

[0036] The cover unit 14 is positioned in front 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 a workpiece from scattering outside the cover unit 14. As shown in Figure 6, the cover unit 14 includes a first movable cover 70, a cover handle 72 (see Figure 7), and a second movable cover 74.

[0037] The first movable cover 70 includes a first right movable cover 78 that defines the external shape of the right half of the first movable cover 70, and a first left movable cover 80 that defines the external shape of the left half of the first movable cover 70. A cutter 12 (see Figure 5) is positioned between the first right movable cover 78 and the first left movable cover 80.

[0038] The first movable cover 70 comprises a first covering portion 82, a first mounting portion 84, a first peripheral 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 Figure 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-side movable cover 78. The first mounting portion 84 and the first circumferential wall portion 86 are positioned near the center of the circle of the first covering portion 82 on the first right-side 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 Figure 4, the first mounting portion 84 is slidably attached to the arm projection 60. The first mounting portion 84 surrounds the outer surface 60b of the arm projection 60. As the first mounting portion 84 rotates around the outer surface 60b of the arm projection 60, the first movable cover 70 rotates around the rotation axis AX2, as shown in Figures 7 and 8. The upper limit of the rotation range of the first movable cover 70 around the rotation axis AX2 is between 30 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 Figure 6, the discharge section 88 is formed on both the first right movable cover 78 and the first left movable cover 80. As shown in Figure 5, the discharge section 88 has a curved tubular shape. The discharge section 88 extends along the rotation direction D2 of the cutter 12. The discharge section 88 is positioned radially outward from the first covering section 82. The discharge section 88 discharges dust generated when the cutter 12 cuts a workpiece to the mounting pipe 116, which will be described later.

[0041] As shown in Figures 7 and 8, the cover handle 72 is attached to the first movable cover 70. By operating the cover handle 72, the user can rotate the first movable cover 70 around the rotation axis AX2 and adjust the orientation of the first movable cover 70. For example, by pushing the cover handle 72 forward, the user can move the first movable cover 70 to the first position, as shown in Figure 7. Alternatively, by pulling the cover handle 72 backward, the user can move the first movable cover 70 to the second position, as shown in Figure 8.

[0042] As shown in Figure 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 positioned between the first right movable cover 78 and the first left movable cover 80. A cutter 12 (see Figure 5) is positioned between the second right movable cover 92 and the second left movable cover 94. The rollers 96 are positioned on the outside of the first movable cover 70. The rollers 96 rotate, for example, when they come into contact with a workpiece. This allows the work machine 2 (see Figure 7) to move smoothly.

[0043] The second movable cover 74 comprises 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 Figure 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 on the second right movable cover 92. The second mounting portion 100 has a substantially cylindrical shape. An opening 102 is defined by the inner surface 100a of the second mounting portion 100. As shown in Figure 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 located in the first space 90 between the first mounting portion 84 and the first peripheral wall portion 86. As 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 and 90 degrees, for example, 45 degrees. The orientation of the second movable cover 74 is adjusted by the user directly holding and manipulating the second movable cover 74, for example, the second covering portion 98, by hand. The second movable cover 74 rotates between an extended position (see Figure 7) and a retracted position (see Figure 8) relative to the first movable cover 70. As shown in Figure 7, when the second movable cover 74 is in the extended position relative to the first movable cover 70, most of the second covering portion 98 is extended from inside to outside the first covering portion 82. The second covering portion 98 partially covers the area of ​​the cutter 12 that is not surrounded by the first covering portion 82. As shown in Figure 8, when the second movable cover 74 is in the retracted position relative to the first movable cover 70, most of the second covering portion 98 is retracted inside the first covering portion 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 Figure 9, the cover unit 14 further includes a bracket 108. The bracket 108 has a substantially disc shape with an opening 110 in the center. The bracket 108 is fixed to the left side of the arm projection 60 by a screw 112. As shown in Figure 4, the bracket 108 is positioned between the cutter 12 and the arm projection 60 in the left-right direction. The first mounting portion 84, the first peripheral wall portion 86, and the second mounting portion 100 are positioned between the left side 10a of the arm 10 and the bracket 108. In this way, the first movable cover 70 and the second movable cover 74 are 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 when the cutter 12 cuts the workpiece, the bracket 108 prevents 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. This prevents dust from entering the bearing 104 and prevents the second movable cover 74 from becoming unable to rotate relative to the first movable cover 70.

[0047] As shown in Figure 6, the cover unit 14 further includes a mounting pipe 116. The mounting pipe 116 is made of, for example, a resin material. In a modified example, the mounting pipe 116 may be made of a metal material. The mounting pipe 116 is attached to the discharge unit 88 so as to be rotatable around the pivot axis AX3 by being sandwiched between the first right movable cover 78 and the first left movable cover 80. The pivot axis AX3 and the rotation axis AX2 are in a twisted position. The mounting pipe 116 is also detachably attached to the dust collection hose 16 (see Figure 7). The mounting pipe 116 also has a curved tubular shape. Because the mounting pipe 116 is rotatable, the user can easily attach the dust collection hose 16 to the mounting pipe 116 by rotating the mounting pipe 116 to a predetermined position. The mounting pipe 116 sends the dust released from the discharge unit 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 Figure 10, the mounting pipe 116 includes a cover mounting portion 118, a curved portion 120, and a hose mounting portion 122. The cover mounting portion 118 extends linearly along the pivot axis AX3. The cover mounting portion 118 is attached to the discharge portion 88 (see Figure 6). The curved portion 120 extends in a curved shape. The curved portion 120 connects the cover mounting portion 118 and the hose mounting portion 122. The hose mounting portion 122 extends linearly. The hose mounting portion 122 is inclined with respect to the pivot axis AX3. The hose mounting portion 122 is attached to the dust collection hose 16 (see Figure 1) by inserting the dust collection hose 16 into it. The dust collection hose 16 is also detachably attached to the hose mounting portion 122. When the dust collection hose 16 is not attached to the hose mounting portion 122, a cap (not shown) is attached to the hose mounting portion 122. When the cap is attached to the hose connection part 122, the discharge of dust from the hose connection part 122 is suppressed.

[0049] The cover mounting portion 118 comprises a flange portion 124, a first receiving portion 126, and a second receiving portion 128. The flange portion 124 is located near the 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 in a circle around the pivot 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 in a circle around the pivot axis AX3.

[0050] The second receiving portion 128 is positioned 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 in a circle around the pivot axis AX3. The second receiving portion 128 includes a first partial receiving portion 130 recessed inward by a first depth from the outer surface of the cover mounting portion 118, and a second partial receiving portion 132 recessed inward by a second depth from the outer surface of the cover mounting portion 118. One end of the first partial receiving portion 130 around the pivot axis AX3 is connected to one end of the second partial receiving portion 132 around the pivot axis AX3, and the other end of the first partial receiving portion 130 around the pivot axis AX3 is connected to the other end of the second partial receiving portion 132 around the pivot axis AX3. The first depth is shallower than the second depth. As shown in Figure 11, a first stepped portion 134 is formed at the connection point between one end of the first partial receiving portion 130 and one end of the second partial receiving portion 132, and a second stepped portion 136 is formed at the connection point between the other end of the first partial receiving portion 130 and the other end of the second partial receiving portion 132.

[0051] Before describing the mounting structure between the mounting pipe 116 and the discharge section 88, the discharge section 88 will be described in detail. As shown in Figure 12, the discharge section 88 includes a stopper section 140 and a rib section 142. The stopper section 140 and the rib section 142 are located at the outlet 88a of the discharge section 88. The stopper section 140 protrudes radially inward from the inner surface of the discharge section 88. The stopper section 140 extends around the inner surface of the discharge section 88 around the pivot axis AX3.

[0052] The rib portion 142 is positioned closer to the outlet 88a side of the discharge portion 88 than the stopper portion 140. The rib portion 142 extends around the inner surface of the discharge portion 88 in a circle around the pivot axis AX3. As shown in Figure 11, the rib portion 142 comprises a first partial rib portion 144 that protrudes radially inward from the inner surface of the discharge portion 88 by a first height, and a second partial rib portion 146 that protrudes radially inward from the inner surface of the discharge portion 88 by a second height. In Figure 11, the inner surface of the discharge portion 88 is shown by a dashed line. One end of the first partial rib portion 144 around the pivot axis AX3 is connected to one end of the second partial rib portion 146 around the pivot axis AX3, and the other end of the first partial rib portion 144 around the pivot axis AX3 is connected to the other end of the second partial rib portion 146 around the pivot 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 Figure 12, when the mounting pipe 116 is attached to the discharge section 88, the cover mounting section 118 is inserted into the discharge section 88. The flange section 124 abuts against the outlet 88a of the discharge section 88 from the outside of the discharge section 88. The end of the cover mounting section 118 faces the stopper section 140. An O-ring 152 is attached to the first receiving section 126, and the O-ring 152 seals the space between the outer surface of the cover mounting section 118 and the inner surface of the discharge section 88. The rib section 142 is received in the second receiving section 128. This prevents the mounting pipe 116 from coming out of the discharge section 88. As shown in Figure 11, the rib section 142 can move around the pivot axis AX3 within the second receiving section 128. When the rib portion 142 moves in the positive direction D3 within the second receiving portion 128 and the first stepped portion 134 comes into contact with the first rib stepped 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 stepped portion 136 comes into contact with the second rib stepped portion 150, the rib portion 142 cannot move further in the negative direction D4 within the second receiving portion 128. As a result, the rotation of the mounting pipe 116 around the pivot axis AX3 is restricted.

[0054] The upper limit of the rotation range A1 of the mounting pipe 116 around the pivot 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 suppresses interference between the housing 4 (see Figure 1) and the dust collection hose 16 (see Figure 1) connected to the mounting pipe 116. When the upper limit of the rotation range A1 of the mounting pipe 116 around the pivot axis AX3 is 30 degrees or more, interference between the housing 4 and the dust collection hose 16 is further suppressed. Also, the upper limit of the rotation range A1 of the mounting pipe 116 around the pivot 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 suppresses contact between the dust collection hose 16 and the cutter 12 (see Figure 1). When the upper limit of the rotation range A1 of the mounting pipe 116 around the pivot axis AX3 is 70 degrees or less, contact between the dust collection hose 16 and the cutter 12 is further suppressed.

[0055] When the first stepped portion 134 is in contact with the first rib stepped portion 148, the orientation of the mounting pipe 116 relative to the first movable cover 70 is forward, with the hose attachment portion 122 facing forward, as shown in Figure 8. When the second stepped portion 136 is in contact with the second rib stepped portion 150, the orientation of the mounting pipe 116 relative to the first movable cover 70 is backward, with the hose attachment portion 122 facing backward, as shown in Figure 7. As shown in Figure 8, when the orientation of the mounting pipe 116 relative to the first movable cover 70 is forward, the housing 4 and the dust collection hose 16 are less likely to interfere with each other, even when the first movable cover 70 is in the second position. Also, as shown in Figure 7, when the orientation of the mounting pipe 116 relative to the first movable cover 70 is backward, the dust collection hose 16 is less likely to come into contact with the cutter 12, even when the first movable cover 70 is in the first position.

[0056] As shown in Figure 13, the work implement 2 is further equipped with a holding unit 160 to prevent the dust collection hose 16 (see Figure 1) from separating from the housing 4 during operation by the work implement 2. The holding unit 160 holds the dust collection hose 16. The holding unit 160 is located near the rear end of the housing 4. The holding unit 160 is located on the right side of the housing 4. This prevents the user from bumping into the dust collection hose 16 when the user is operating the work implement 2 while standing to its left side.

[0057] The retaining unit 160 comprises a base 162 and a hose retaining 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 comprises a bottom wall 166 and a pair of opposing walls 168 and 170. Hereinafter, the pair of opposing walls 168 and 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 screws 172.

[0058] As shown in Figure 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 and 170 are arranged facing each other in the vertical direction. The upper opposing wall 168 has an upper receiving portion 174 that penetrates the upper opposing wall 168 in the thickness direction (vertical direction). The lower opposing wall 170 has a lower receiving portion 176 that penetrates the lower opposing wall 170 in the thickness direction (vertical direction). The upper receiving portion 174 is arranged facing 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 that extends 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 comprises a band portion 180, a rib portion 182, an upper connecting portion 184, a lower connecting portion 186, an upper projection 188, and a lower projection 190. The band portion 180 has a partially broken 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 Figure 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 such 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 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 radially inward by a third height. This increases the rigidity of the hose holding member 164. In Figure 15, the inner surface 180a of the band portion 180 is shown by a dashed 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 Figure 16, the rib portion 182 is positioned at the center of the band portion 180 in the width direction (front-to-back direction). The width of the rib portion 182 in the front-to-back 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. By the rib portion 182 abutting against the outer surface of the dust collection hose 16, movement of the dust collection hose 16 relative to the hose holding member 164 can be suppressed. In Figure 16, the outer surface of the dust collection hose 16 is shown by a dashed line. Furthermore, when the dust collection hose 16 is a corrugated hose, the dust collection hose 16 has a plurality of protrusions 16a on its outer surface that are arranged 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, the movement of the dust collection hose 16 relative to the hose holding member 164 can be further suppressed.

[0061] As shown in Figure 15, the upper connector 184 is connected to one end of the band portion 180 in the longitudinal direction. The lower connector 186 is connected to the other end of the band portion 180 in the longitudinal direction. The upper connector 184 is positioned vertically apart from the lower connector 186. The vertical distance between the upper connector 184 and the lower connector 186 is shorter than the diameter of the dust collection hose 16. The lower surface 184a of the upper connector 184 faces the upper surface 186a of the lower connector 186. A mounting opening 192 is defined between the lower surface 184a of the upper connector 184 and the upper surface 186a of the lower connector 186.

[0062] The upper projection 188 and the lower projection 190 are positioned on a pivot axis AX5 that extends in the vertical direction. The upper projection 188 protrudes from the upper surface 184b of the upper connection part 184 in a direction away from the upper connection part 184 (upwards). The upper projection 188 has a substantially cylindrical shape corresponding to the upper receiving part 174. The upper projection 188 is received by the upper receiving part 174 by being inserted into the upper receiving part 174 from below. The lower projection 190 protrudes from the lower surface 186b of the lower connection part 186 in a direction away from the lower connection part 186 (downwards). The lower projection 190 has a substantially cylindrical shape corresponding to the lower receiving part 176. The lower projection 190 is received by the lower receiving part 176 by being inserted into the lower receiving part 176 from above. When the upper projection 188 is received by the upper receiving portion 174 and the lower projection 190 is received by the lower receiving portion 176, the mounting opening 192 is closed by the bottom wall 166 of the base 162. This prevents the dust collection hose 16 from coming out of the band portion 180 by passing through the mounting opening 192 and crossing the band portion 180. Also, when the upper projection 188 is received by the upper receiving portion 174 and the lower projection 190 is received by the lower receiving portion 176, the hose holding member 164 can swing around the pivot axis AX5 relative to the base 162. Therefore, when the posture of the work machine 2 (see Figure 13) is changed, it can swing relative to the housing 4 (see Figure 13) in accordance with the orientation of the dust collection hose 16. As a result, the force acting from the dust collection hose 16 to the hose holding member 164 is reduced compared to a configuration in which the hose holding member 164 is immovable relative to the housing 4. The pivot axis AX5 coincides with the rotation axis AX4.

[0063] Referring to Figures 13 and 14, the method for attaching the dust collection hose 16 to the holding unit 160 will be described. First, the band portion 180 shown in Figure 13 is grasped by the user and bent so that the upper connecting portion 184 and the lower connecting portion 186 move closer together. The hose holding member 164 is removed from the base 162 as shown in Figure 14 by the upper protrusion 188 being pulled out of the upper receiving portion 174 and the lower protrusion 190 being pulled out of the lower receiving portion 176. Next, the dust collection hose 16 (see Figure 13) is pushed into the band portion 180 by the user through the mounting opening 192. Next, the band portion 180 is grasped by the user and bent so that the upper connecting portion 184 and the lower connecting portion 186 move closer together. Finally, the user inserts the upper projection 188 into the upper receiving portion 174 and the lower projection 190 into the lower receiving portion 176. As a result, as shown in Figure 13, the dust collection hose 16 is held in the holding unit 160, and the hose holding member 164 is attached to the housing 4 via the base 162. In this state, as shown in Figure 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 connection portion 184, the lower connection 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 houses the prime mover 36, a cutter 12 (an example of a cutting part) that operates in accordance with the operation of the prime mover 36 and cuts the workpiece, a dust collection hose 16 for collecting dust generated when the cutter 12 cuts the workpiece, 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 able to swing around the pivot axis AX5.

[0065] According to the above configuration, when the posture of the work machine 2 is changed, the hose holding member 164 swings relative to the housing 4, thereby reducing the force acting from the dust collection hose 16 to the hose holding member 164. This prevents damage to the hose holding member 164.

[0066] Furthermore, the hose holding member 164 is equipped with a band portion 180 that surrounds the outer surface of the dust collection hose 16 in the circumferential direction. 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 can pass over the band portion 180 and escape from it.

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

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

[0069] With the above configuration, the dust collection hose 16 can be placed inside the band portion 180 with the hose holding member 164 removed from the housing 4, and then the hose holding member 164 can be attached to the housing 4. This makes it easy to 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, and a rib portion 182 that protrudes inward from the inner surface 180a of the band portion 180. The rib portion 182 can come into contact with the outer surface of the dust collection hose 16 when the hose holding member 164 is holding the dust collection hose 16.

[0071] With the above configuration, the rib portion 182 comes into contact with the outer surface of the dust collection hose 16, thereby preventing the dust collection hose 16 from moving relative to the band portion 180.

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

[0073] The above configuration makes it possible to suppress the complexity of the housing 4's shape.

[0074] Furthermore, one of the hose holding member 164 and the base 162 is provided with an upper projection 188 (an example of a projection). One of the hose holding member 164 and the base 162 is provided with an upper receiving portion 174 (an example of a receiving portion) that receives the upper projection 188. The hose holding member 164 swings about the pivot axis AX5 as the upper projection 188 rotates about the rotation axis AX4 within the upper receiving portion 174.

[0075] With the above configuration, the hose holding member 164 can be swung around the pivot axis AX5 with a simple structure.

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

[0077] According to the above configuration, it is possible to suppress the complexity of the hose holding member 164 and the base 162.

[0078] (Second example) A second embodiment will be described with reference to Figure 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 differs from the configuration 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 projection 188. The stopper portion 200 prevents the upper projection 188 from coming out of the upper receiving portion 174. That is, one end of the hose holding member 164 in the longitudinal direction is irremovably attached to the base 162, and the other end of the hose holding member 164 in the longitudinal direction is removablely attached to the base 162. This prevents the loss of the hose holding member 164. In a modified example, the stopper portion 200 may be connected to the lower end of the lower projection 190, preventing the lower projection 190 from coming 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 grasped by the user and bent so that the upper connecting portion 184 and the lower connecting portion 186 move closer together. The other end of the hose holding member 164 in the longitudinal direction is removed from the base 162 by the lower projection 190 being pulled out from the lower receiving portion 176. Next, the dust collection hose 16 is pushed into the band portion 180 by the user through the mounting opening 192. Next, the band portion 180 is grasped by the user and bent so that the upper connecting portion 184 and the lower connecting portion 186 move closer together. Finally, the lower projection 190 is inserted into the lower receiving portion 176 by the user. As a result, with the dust collection hose 16 held in place by the holding unit 160, the hose holding member 164 is attached to the housing 4 via the base 162.

[0080] (Third embodiment) A third embodiment will be described with reference to Figure 18. In the third embodiment, only the differences from the first embodiment will be described. In the third embodiment, the configuration of the hose holding member 164 differs 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 projection 188. The upper stopper portion 300 prevents the upper projection 188 from coming out of the upper receiving portion 174. A lower stopper portion 302 is connected to the lower end of the lower projection 190. The lower stopper portion 302 prevents the lower projection 190 from coming out of the lower receiving portion 176. In other words, the hose holding member 164 is irremovably attached to the base 162. This prevents the loss of the hose holding member 164.

[0081] The band portion 180 comprises an upper band portion 304 and a lower band portion 306. The upper band portion 304 is positioned 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 consists 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. A mounting 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 the inner surface 318 of the upper band portion 304 and the inner surface 320 of the lower band portion 306, respectively.

[0082] When attaching the dust collection hose 16 to the holding unit 160, the user pushes the dust collection hose 16 through the mounting opening 316 between the upper band portion 304 and the lower band portion 306. This holds the dust collection hose 16 in the holding unit 160. In this state, when the dust collection hose 16 moves relative to the housing 4 (see Figure 13), the hose holding member 164 swings around the pivot axis AX5. The orientation of the hose holding member 164 is adjusted as the dust collection hose 16 moves. This prevents the dust collection hose 16 from coming out of the hose holding member 164 and crossing the band portion 180 through the mounting opening 316.

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

[0084] The prime mover 36 according to one embodiment may be an engine.

[0085] In one embodiment, the work machine 2 may be equipped with a power cord instead of a 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 retaining unit 160 is not limited to the right side of the housing 4. In one embodiment, the retaining unit 160 may be located on the left side of the housing 4, or on the top surface of the housing 4. Furthermore, in one embodiment, the retaining unit 160 may be located near the front end of the housing 4.

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

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

[0089] In one embodiment, the second receiving section 128 may be formed in the discharge section 88. In this case, the rib section 142 is formed in the mounting pipe 116. [Explanation of Symbols]

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

Claims

1. The prime mover and A housing for the prime mover, The cutting unit operates by the operation of the aforementioned prime mover and cuts the workpiece, A dust collection hose for collecting dust generated when the cutting section cuts the workpiece, A hose holding member for holding the dust collection hose, It comprises a base fixed to the housing, The hose holding member is attached to the housing so as to be able to swing around the pivot axis, The hose holding member is attached to the housing via the base, The hose holding member and the base are each provided with a first projection and a second projection. The other of the hose holding member and the base comprises a first receiving portion into which the first protrusion is inserted, and a second receiving portion into which the second protrusion is inserted. The first and second protrusions are arranged on the axis of rotation, The first projection extends in a first direction along the axis of rotation, The second projection extends along the axis of rotation in a second direction opposite to the first direction, The hose holding member is a work machine that oscillates around the pivot axis as the first projection rotates around the rotation axis within the first receiving portion and the second projection rotates around the rotation axis within the second receiving portion.

2. The hose holding member includes a band portion that surrounds the outer surface of the dust collection hose in the circumferential direction of the outer surface, The work machine according to claim 1, wherein, when 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 slips out of 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 The dust collection hose comprises a band portion that surrounds the outer surface of the outer surface in the circumferential direction, The band portion is provided with a rib portion that protrudes inward from the inner surface of the band portion, The work machine according to claim 1, wherein the rib portion is capable of contacting the outer surface of the dust collection hose when the hose holding member is holding the dust collection hose.

5. A mounting opening is defined between one end and the other end in the longitudinal direction of the band portion. The work machine according to claim 2, wherein when the hose holding member is attached to the housing via the base, the mounting opening is closed by the base.

6. The work machine according to claim 1, wherein the pivoting axis coincides with the rotation axis.

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