Resin fastener, inner member of resin fastener, outer member of resin fastener, and construction machine

Abstract

To provide a fixture capable of suppressing damage on an attachment member.SOLUTION: A resin fixture CL detachably fixes a frame body 83 configuring a dust-proof net 80 on a middle-bridge plate 55 configuring the dust-proof device 50. The resin fixture includes an inner member 91 fixed on the middle-bridge plate 55 located inside of the frame body 83, and an outer member 90 placed outside of the frame body 83. The inner member 91 is attached on the middle-bridge plate 55 and has an extension part 91T extending through the frame body 83. The outer member 90, in a state of being contact with the extension part 91T penetrating and extending through the frame body 83, is allowed to move along an extending direction (X-axis direction) of the extension part 91T to a direction closer to the frame body 83 relating to the extension part 91T and not to move along the extending direction (X-axis direction) of the extension part 91T to a direction away from the frame body 83 relating to the extension part 91T with a ratchet mechanism.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a resin fastener and a construction machine. [Background technology]

[0002] BACKGROUND ART Conventionally, an iron fastener for detachably fastening a dustproof net to the front side of a radiator has been known (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-236693 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when iron fasteners are used, the surface of the frame of the dustproof net that comes into contact with the fasteners may be damaged by metallic contact with the fasteners, which may reduce the quality of the dustproof net, such as its durability.

[0005] Therefore, it is desirable to suppress damage to mounting members such as the frame of the dustproof net caused by fasteners that secure members such as the dustproof net to an installed object such as a radiator. [Means for solving the problem]

[0006] A resin fastener according to an embodiment of the present invention is a resin fastener for detachably fastening a mounting member to an installation object, and includes an inner member that is fixed to the installation object and has a portion disposed on the installation object side that is inside the mounting member, and an outer member that is disposed outside the mounting member so as to sandwich the mounting member with respect to the installation object, and the inner member has an extension portion that extends through the mounting member. a retaining portion that is inserted into a hole formed in the installation object and fixed thereto; and a base portion that is formed between the retaining portion and the extension portion. The extension portion has a plurality of ratchet teeth that form a part of a ratchet mechanism that is a mechanism for limiting the movement direction to one direction, the base portion has a size larger than the hole in a front view along the extension direction of the extension portion, The outer member has an outer wall portion through which the extension portion is inserted, and an elastically deformable ratchet pawl extending from the outer wall portion and engaging with the ratchet teeth, and is configured so that when the ratchet teeth formed on the extension portion and the ratchet pawl are in contact, the ratchet pawl is movable relative to the extension portion toward the mounting member along the extension direction of the extension portion, and is unable to move relative to the extension portion toward the mounting member along the extension direction of the extension portion, and is unable to move relative to the extension portion toward the mounting member away from the mounting member, the installation object is an object to which the mounting member is detachably fixed by the resin fixing device, and the mounting member is a member fixed to the installation object by the resin fixing device. [Effects of the Invention]

[0007] The above-described resin fastener can suppress damage to the mounting member. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a shovel according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view schematically showing an engine compartment of the excavator according to the embodiment. [Figure 3] FIG. 2 is an enlarged perspective view showing a dust prevention device and a heat exchange device of the shovel. [Figure 4] FIG. 10 is a partially enlarged view illustrating the relationship between the upper guide member and the dustproof net. [Figure 5] 10A and 10B are diagrams illustrating an example of the configuration of a resin fixture. [Figure 6] 1A and 1B are a top view and a cross-sectional view of a resin fixture. [Figure 7] 10A and 10B are diagrams illustrating an example of the configuration of an inner member. [Figure 8] 10A and 10B are diagrams illustrating another configuration example of the outer member. [Figure 9] 10A and 10B are diagrams showing another example of the configuration of the resin fixing tool. [Figure 10] 10A and 10B are diagrams showing still another configuration example of the resin fixing tool. [Figure 11] 10A and 10B are diagrams illustrating still another configuration example of the outer member. DETAILED DESCRIPTION OF THE INVENTION

[0009] Fig. 1 is a side view showing a shovel, which is an example of a construction machine according to an embodiment of the present invention. Fig. 2 is a schematic diagram showing the internal configuration of an engine compartment 34. The cross section is taken on a virtual plane parallel to the XZ plane including the dashed dotted line in Fig. 1.

[0010] The excavator has a self-propelled crawler-type lower traveling body 1 and an upper rotating body 3 rotatably mounted on the lower traveling body 1 via a rotating mechanism 2.

[0011] A boom 4 is attached to the upper rotating body 3. An arm 5 is attached to the tip of the boom 4, and a bucket 6 is attached to the tip of the arm 5 as an end attachment. The boom 4, arm 5, and bucket 6 together make up a work attachment.

[0012] The boom 4 is attached to the rotating frame 31 so as to be able to move up and down. The arm 5 is attached to the tip of the boom 4 so as to be able to rotate. In addition, the bucket 6 is attached to the tip of the arm 5 so as to be able to rotate.

[0013] The boom cylinder 7 is disposed between the revolving frame 31 and the boom 4. The boom cylinder 7 causes the boom 4 to move up and down relative to the revolving frame 31. The arm cylinder 8 is disposed between the boom 4 and the arm 5. The arm cylinder 8 causes the arm 5 to rotate relative to the boom 4. The bucket cylinder 9 is disposed between the bucket 6 and the arm 5. The bucket cylinder 9 causes the bucket 6 to rotate relative to the arm 5.

[0014] The upper rotating body 3 is installed on the lower traveling body 1 so as to be able to rotate freely via a rotating mechanism 2. As shown in Figures 1 and 2, the upper rotating body 3 is provided with a rotating frame 31, a cab 10, a counterweight 32, an exterior cover 33, an engine 11, a heat exchanger 40, a dust prevention device 50, an exhaust gas treatment device 60, and the like.

[0015] The cab 10 is provided on a revolving frame 31, and a driver's seat (not shown) is provided inside the cab 10. An operator sits in the driver's seat inside the cab 10 and drives and operates the excavator.

[0016] The counterweight 32 functions to balance the weight of the work attachment. The exterior cover 33 and the engine hood 34a cover the engine 11, the heat exchanger 40, the dust prevention device 50, the exhaust gas treatment device 60, and other components disposed in the engine compartment 34.

[0017] Next, a description will be given of the configuration inside the engine compartment 34. Inside the engine compartment 34, the engine 11, the heat exchanger 40, the dust prevention device 50, the exhaust gas treatment device 60, and the like are arranged.

[0018] The engine 11 is supported via a mount 31b on the upper part of an engine mounting seat 31a arranged on the revolving frame 31. The mount 31b is an anti-vibration mount that prevents vibrations generated by the engine 11 from being transmitted to the revolving frame 31.

[0019] A cooling fan 35 is disposed on the X1 direction side (left side in the drawing) of the engine 11. A heat exchanger 40 is disposed on the X1 direction side of the cooling fan 35. Furthermore, a dust prevention device 50 is disposed on the X1 direction side of the heat exchanger 40.

[0020] The cooling fan 35 is driven to rotate by the engine 11. When the cooling fan 35 is driven to rotate, outside air is taken into the engine compartment 34 as cooling air W from an air intake provided in the maintenance door 33A. The heat exchanger 40 performs heat exchange processing (cooling processing) using the cooling air W taken into the engine compartment 34.

[0021] The cooling air W flows from left to right as shown by the arrows in Figure 2. Therefore, the X1 side is the upstream side of the cooling air, and the X2 direction is the downstream side of the cooling air. In this embodiment, the Z1 side is the upper side, and the Z2 side is the lower side.

[0022] The heat exchanger 40 is configured by integrating heat exchangers such as a radiator unit 40A, a fuel cooler 40B, a condenser 40C, an oil cooler 40D, and an intercooler 40E into a single unit (see FIG. 3).

[0023] The radiator unit 40A cools the cooling water flowing through the engine 11. The fuel cooler 40B cools excess fuel that returns to a fuel tank (not shown). The condenser 40C is a condenser that generates cool air in an air conditioner mounted in the cab 10. The oil cooler 40D cools the hydraulic oil used in hydraulic actuators such as the boom cylinder 7, arm cylinder 8, and bucket cylinder 9. The intercooler 40E cools the supercharged air supplied to the engine 11. The various refrigerants such as the cooling water and hydraulic oil that flow into these heat exchangers are cooled by the cooling air W.

[0024] A hydraulic pump 14 is attached to the X2 side of the engine 11. The hydraulic pump 14 is a hydraulic source that supplies hydraulic oil to the boom cylinder 7, arm cylinder 8, and bucket cylinder 9 that drive the work attachment. The hydraulic pump 14 is driven by the engine 11.

[0025] The exhaust gas emitted from the engine 11 is purified by an exhaust gas treatment device 60. The exhaust gas emitted from the engine 11 may contain harmful substances such as nitrogen oxides (NOx), and the exhaust gas treatment device 60 is connected to the engine 11 to purify these substances.

[0026] The exhaust gas treatment device 60 is provided with a first treatment device 61 in which an oxidation catalyst that burns particulates in the exhaust gas is disposed, and a selective catalytic reduction (SCR) catalyst 62 as a second treatment device that reduces and removes nitrogen oxides (NOx) in the exhaust gas from which the particulates have been removed using a selective reducing agent (e.g., urea, etc.) etc. As the first treatment device 61, a diesel particulate filter (DPF) that collects particulate matter (PM) contained in the exhaust gas may be used.

[0027] The exhaust gas treatment device 60 is supported by a frame body 36 having a support body 37, a firewall 42, and the like.

[0028] Next, the heat exchange device 40 and the dust prevention device 50 will be described with reference to Fig. 3. Fig. 3 is a perspective view of the heat exchange device 40 and the dust prevention device 50. In Fig. 3, for clarity, the net member F (see Fig. 4(A)) is omitted from the illustration.

[0029] As described above, the heat exchanger 40 has heat exchangers such as the radiator unit 40A, the fuel cooler 40B, the condenser 40C, the oil cooler 40D, and the intercooler 40E, and these heat exchangers are attached to the frame 41.

[0030] The frame 41 has a first frame member 41A and a second frame member 41B arranged opposite each other and spaced apart, a third frame member 41C connecting the upper end of the first frame member 41A to the upper end of the second frame member 41B, and a fourth frame member 41D connecting the lower end of the first frame member 41A to the lower end of the second frame member 41B.

[0031] The first frame member 41A to the fourth frame member 41D each form a substantially rectangular frame as a whole. The radiator unit 40A and the oil cooler 40D of the heat exchanger 40 are attached inside the frame 41, which has a substantially rectangular frame shape. Specifically, the radiator unit 40A shown in FIG. 3 is attached to the first frame member 41A and the second frame member 41B. The fuel cooler 40B, the condenser 40C, and the intercooler 40E are attached to support members or the like extending from the frame 41, and are disposed on the upstream side (X1 side) of the radiator unit 40A in the flow direction of the cooling air W.

[0032] The dustproof device 50 is attached upstream of the heat exchange device 40 in the flow direction of the cooling air W. The dustproof device 50 is disposed in the engine compartment 34 near a maintenance door 33A that forms a side portion of the exterior cover 33, as shown in FIG.

[0033] The dustproof device 50 includes a net bracket 51A, a net bracket 51B, and a dustproof net 80.

[0034] The net bracket 51A is located on the Y1 side of the dust prevention device 50 and is attached to the first frame member 41A. The net bracket 51B is located on the Y2 side of the dust prevention device 50 and is attached to the second frame member 41B. In this way, the net bracket 51A and the net bracket 51B are attached to the frame 41 of the heat exchange device 40 so as to sandwich the fuel cooler 40B, the condenser 40C, and the intercooler 40E therebetween.

[0035] In this embodiment, the net bracket 51A is fixed to the first frame member 41A using bolts, and the net bracket 51B is fixed to the second frame member 41B using bolts. However, the method for fixing the net bracket 51A to the first frame member 41A is not particularly limited, and other fixing methods (welding, etc.) may be used, or a detachable configuration may be used. The same applies to the method for fixing the net bracket 51B to the second frame member 41B.

[0036] Net bracket 51A has an inclined portion 52A that gradually widens from the upper end toward the center, and an inclined portion 53A that gradually widens from the lower end toward the center. Specifically, net bracket 51A has a shape in which the center protrudes upstream relative to the upper and lower ends in the flow direction of cooling air W. In other words, net bracket 51A is configured so that the center protrudes in the X1 direction compared to the upper and lower ends in a side view.

[0037] Similarly, net bracket 51B has an inclined portion 52B that gradually widens from the upper end toward the center, and an inclined portion 53B that gradually widens from the lower end toward the center. Specifically, net bracket 51B has a shape in which the center protrudes upstream in the flow direction of cooling air W compared to the upper and lower ends. In other words, net bracket 51B is configured so that the center protrudes in the X1 direction compared to the upper and lower ends in a side view.

[0038] A reinforcing plate 54 is disposed between the upper end of net bracket 51A and the upper end of net bracket 51B. In addition, a center bridge plate 55 is disposed between the protruding center of net bracket 51A and the protruding center of net bracket 51B.

[0039] An opening 59 is formed at the upper end of the dustproof device 50. A reinforcing plate 54 is provided in the opening 59. The reinforcing plate 54 increases the strength of the upper portions of the net bracket 51A and the net bracket 51B. The opening 59 is covered by the engine hood 34a when the engine hood 34a is attached to the exterior cover 33.

[0040] The intermediate plate 55 is provided to increase the strength of the central portion of each of the net bracket 51 A and the net bracket 51 B. A placing portion 56 is provided at the central position of the intermediate plate 55.

[0041] In this way, the upper ends of the net bracket 51A and the net bracket 51B are reinforced by the reinforcing plate 54, and the central portions are reinforced by the intermediate plate 55. As a result, the net bracket 51A and the net bracket 51B are disposed opposite each other with a predetermined gap between them.

[0042] 3, the width dimension (length in the X-axis direction) of the reinforcing plate 54 is set to the smallest width dimension possible within a range that allows the strength of the dustproof device 50 to be maintained at a predetermined level or above. Note that the reinforcing plate 54 does not need to be installed between the net bracket 51A and the net bracket 51B if the net bracket 51A and the net bracket 51B can be reinforced by other members.

[0043] An upper guide member 70A is provided near the upper end of net bracket 51A. A lower guide member 71A is provided near the lower end of net bracket 51A. Similarly, an upper guide member 70B is provided near the upper end of net bracket 51B, and a lower guide member 71B is provided near the lower end of net bracket 51B.

[0044] The upper guide member 70A and the upper guide member 70B are arranged to be mirror-symmetrical with respect to the XZ plane. Similarly, the lower guide member 71A and the lower guide member 71B are arranged to be mirror-symmetrical with respect to the XZ plane.

[0045] Each of the upper guide member 70A and the upper guide member 70B has a fixing surface 70x extending in the X-axis direction and a locking surface 70y as an upper surface extending in the Y-axis direction. Similarly, each of the lower guide member 71A and the lower guide member 71B has a fixing surface 71x extending in the X-axis direction and a locking surface 71y as an upper surface extending in the Y-axis direction.

[0046] Here, the upper guide members 70A and 70B as guide members will be described with reference to Fig. 4. Fig. 4(A) is a perspective view of the dust prevention device 50, and Fig. 4(B) is a side view of the dust prevention device 50.

[0047] Net bracket 51A has an inclined portion 52A. Upper guide member 70A is disposed near the upper portion of inclined portion 52A, which has an inclination angle α1 with respect to the horizontal plane. Similarly, net bracket 51B has an inclined portion 52B. Upper guide member 70B is disposed near the upper portion of inclined portion 52B, which has an inclination angle α1 with respect to the horizontal plane.

[0048] In this embodiment, the upper edge 33B of the maintenance door 33A is close to this position, as shown in Figure 2. The upper guide members 70A, 70B in this embodiment are configured to avoid interference with the upper edge 33B of the maintenance door 33A. This point will be explained in detail below.

[0049] The upper guide member 70A has a notch 70K at a midpoint in the attachment direction (Z-axis direction) of the dustproof net 80. Specifically, the notch 70K is cut out over a portion of the approximately middle position between the locking surface 70y and the fixing surface 70x. The same is true for the upper guide member 70B. Note that the shape of the notch is not limited to this and may be changed as appropriate.

[0050] The locking surface 70y of this embodiment has a front side portion 70yA in front of the notch 70K (X1 side) in the attachment direction of the dustproof net 80, and a rear side portion 70yB behind the notch 70K (X2 side).

[0051] The locking surface 70y of the upper guide member 70A is inclined relative to the inclined portion 52A of the net bracket 51A, and is formed so that the front side portion 70yA and the rear side portion 70yB of the locking surface 70y have different inclination angles. The same is true for the locking surface 70y of the upper guide member 70B.

[0052] As shown in FIG. 4B, the front portion 70yA has an inclination angle β1 with respect to the inclined portion 52B. The rear portion 70yB has an inclination angle β2 with respect to the inclined portion 52B. Therefore, an inclined space 70C is formed between the front portion 70yA of the locking surface 70y and the inclined portion 52B. The inclined space 70C is shaped such that its width (the distance between the front portion 70yA and the inclined portion 52B) gradually narrows from bottom to top. Furthermore, an inclined space 70D is formed between the rear portion 70yB of the locking surface 70y and the inclined portion 52B. The inclined space 70D is shaped such that its width (the distance between the rear portion 70yB and the inclined portion 52B) gradually narrows from bottom to top. The same applies to the inclined portion 52A.

[0053] The inclination angle β1 is set to be larger than the inclination angle β2. Therefore, the opening angle of the front portion 70yA of the locking surface 70y of the upper guide member 70B is larger than the opening angle of the rear portion 70yB of the locking surface 70y. Furthermore, the inclined space 70C is larger than the inclined space 70D. The same applies to the upper guide member 70A.

[0054] An insertion portion 74 is formed at the upper end portion (the end portion on the Z1 side) of the upper guide member 70B. The insertion portion 74 has a shape and size that allows an upper dustproof net 81, which will be described later, to be inserted therethrough. The same applies to the upper guide member 70A.

[0055] 2, the upper guide member 70A and the upper guide member 70B are installed in proximity to the upper edge 33B of the maintenance door 33A, and more specifically, the notch 70K is positioned to correspond to the upper edge 33B. Therefore, by having the notch 70K, both the upper guide member 70A and the upper guide member 70B can avoid interference with the upper edge 33B of the maintenance door 33A, which is a surrounding member.

[0056] In the example shown in FIG. 3, the lower guide member 71A disposed near the lower end of the net bracket 51A has substantially the same configuration as the upper guide member 70A, but is arranged upside down. The same is true for the lower guide member 71B. Therefore, a description of the lower guide member 71A and the lower guide member 71B will be omitted. Note that in the example shown in FIG. 3, the lower guide member 71A and the lower guide member 71B do not have notches. However, the lower guide member 71A may have a notch similar to the notch 70K of the upper guide member 70A. The lower guide member 71A may have a front side portion and a rear side portion with different inclination angles relative to the inclined portion 53A. The same is true for the lower guide member 71B.

[0057] Meanwhile, soundproofing material 57 is arranged on the inner wall surfaces of net bracket 51A, net bracket 51B, and reinforcing plate 54 that constitute dustproof device 50, to the extent that it does not interfere with other equipment or devices. Fig. 3 shows part of soundproofing material 57 with a dot pattern.

[0058] The noise generated inside the engine compartment 34 is mainly noise generated by the rotation of the cooling fan 35. Most of the noise generated by the cooling fan 35 is transmitted to the outside of the engine compartment 34 through the space where the heat exchanger 40 and the dust prevention device 50 are located.

[0059] In this embodiment, the soundproofing material 57 is disposed on the inner wall surface of the dustproof device 50, which is located midway along the transmission path of noise from the cooling fan 35 to the outside. Therefore, the noise generated by the cooling fan 35 is absorbed by the soundproofing material 57 installed in the dustproof device 50, thereby reducing the noise transmitted to the outside.

[0060] 2, the dustproof device 50 is disposed in close proximity to the cooling fan 35. Therefore, noise generated by the cooling fan 35 is absorbed in a position close to the noise generation position. Therefore, the dustproof device 50 can efficiently reduce noise.

[0061] Furthermore, since the soundproofing material 57 is provided on the inner surface of each of the net brackets 51A and 51B, the soundproofing material 57 does not interfere with the passage of the cooling air W when the cooling air W passes through the dustproof device 50. In other words, even if the soundproofing material 57 is provided, the cooling efficiency of the heat exchange device 40 is not reduced.

[0062] Next, the dustproof net 80 attached to the net bracket 51A and the net bracket 51B will be described with reference to FIGS.

[0063] In this embodiment, the dustproof net 80 is divided into two parts, an upper dustproof net 81 and a lower dustproof net 82. Both the upper dustproof net 81 and the lower dustproof net 82 have a configuration in which a net member F is disposed on a rectangular frame body 83. As shown in Fig. 4(A), the net member F is a filter that removes dust contained in the cooling air W, and is not shown in Fig. 3 for clarity.

[0064] The frame 83 of the upper dustproof net 81 is provided with a grip 84 that is held by an operator when removing the upper dustproof net 81 from the net brackets 51A and 51B or when attaching the upper dustproof net 81 to the net brackets 51A and 51B. Similarly, the frame 83 of the lower dustproof net 82 is provided with a grip 85.

[0065] The upper dustproof net 81 is detachably attached to the inclined portion 52A of the net bracket 51A and the inclined portion 52B of the net bracket 51B. Similarly, the lower dustproof net 82 is detachably attached to the inclined portion 53A of the net bracket 51A and the inclined portion 53B of the net bracket 51B.

[0066] When the upper dustproof net 81 is attached to the inclined portions 52A and 52B, the upper end portion 81A is fixed by being abutted against the sealing member S1 (see Figures 2 and 4(B)), and the lower end portion 81B is fixed to the intermediate plate 55 with a resin fixing device CL.

[0067] When the lower dustproof net 82 is attached to the inclined portions 53A and 53B, the lower end 82B is fixed by being abutted against the sealing member S2 (see FIG. 2), and the upper end 82A is fixed to the intermediate plate 55 with a resin fastener CL. As the sealing members S1 and S2, an elastic member or a flexible member that undergoes compressive deformation (including elastic deformation, flexibly deformation, etc.) when a load is applied is selected. Specifically, for example, a rubber member, a foam member, an elastic resin member, or the like is used.

[0068] As shown in FIG. 2, the heat exchange device 40 and the dust prevention device 50 are fixed upstream of the cooling fan 35 in the flow direction of the cooling air W in the engine compartment 34.

[0069] A fixing base 38 is formed on the revolving frame 31 at a position where the heat exchanger 40 and the dustproof device 50 are to be installed. The fixing base 38 is formed to protrude from the floor surface of the revolving frame 31. The heat exchanger 40 is fixed on the fixing base 38. With the heat exchanger 40 fixed to the engine compartment 34, the upper part of the dustproof device 50 is covered by an engine hood 34a. The engine hood 34a is configured to be openable and closable relative to the exterior cover 33.

[0070] The dust prevention device 50 is disposed upstream of the heat exchange device 40 with respect to the flow direction of the cooling air W. Therefore, the dust prevention device 50 can prevent foreign matter such as dust from entering each heat exchanger, such as the radiator unit 40A, the fuel cooler 40B, the condenser 40C, the oil cooler 40D, and the intercooler 40E, which constitute the heat exchange device 40, and can prevent clogging of each heat exchanger.

[0071] Next, mainly with reference to Figure 4, the attachment and detachment of the dustproof net 80 in the dustproof device 50 will be described. The following description relates to the attachment and detachment of the upper dustproof net 81, but it also applies to the attachment and detachment of the lower dustproof net 82. Figures 4(A) and 4(B) show the state of the upper dustproof net 81 at three different times.

[0072] First, the details of the work performed by the worker to remove the upper dustproof net 81 from the net brackets 51A and 51B will be described.

[0073] When removing the upper dustproof net 81 from the net brackets 51A and 51B, the worker first operates the resin fasteners CL to release the upper dustproof net 81 from the intermediate plate 55. Then, the worker grasps the gripping portion 84 and pulls the lower end portion 81B of the upper dustproof net 81 downward and toward the worker.

[0074] An upper guide member 70A is provided near the upper end of net bracket 51A, and an upper guide member 70B is provided near the upper end of net bracket 51B. Upper guide members 70A and 70B have sloped spaces 70C and 70D formed therein that gradually narrow from bottom to top. Furthermore, sloped space 70C is wider than sloped space 70D, and the opening angle of front portion 70yA of engagement surface 70y of upper guide members 70A and 70B is greater than the opening angle of rear portion 70yB of engagement surface 70y. Therefore, when removing upper dustproof net 81, the worker can tilt upper dustproof net 81 significantly relative to sloped portions 52A and 52B as they pull it downward and forward, allowing for removal at an angle that is comfortable for the worker.

[0075] Next, the details of the work performed by a worker to attach upper dustproof net 81 to net brackets 51A and 51B will be described. When attaching upper dustproof net 81 to net brackets 51A and 51B, the worker grasps gripping portions 84 to lift upper dustproof net 81, and inserts the left and right ends of upper end portion 81A into upper guide members 70A and 70B.

[0076] The upper guide members 70A and 70B have a fixing surface 70x and a locking surface 70y. The locking surface 70y and the inclined portions 52A and 52B function as guides in the front-to-rear direction (X-axis direction) when the ends of the upper dustproof net 81 are inserted into the inclined spaces 70C and 70D.

[0077] When the ends of the upper dustproof net 81 are inserted into the inclined spaces 70C and 70D, the fixing surfaces 70x engage with the left and right side portions thereof, thereby functioning as guides in the width direction (Y-axis direction).

[0078] In this way, when attaching the upper dustproof net 81 to the net brackets 51A and 51B, the upper guide members 70A and 70B function as guides in both the front-to-rear direction (X-axis direction) and the width direction (Y-axis direction) perpendicular to the front-to-rear direction. This allows the worker to avoid the tedious task of positioning the upper dustproof net 81 relative to the net brackets 51A and 51B when attaching the upper dustproof net 81 to the net brackets 51A and 51B.

[0079] In this embodiment, the upper guide members 70A and 70B are configured so that the inclined spaces 70C and 70D formed therein gradually narrow from bottom to top. Furthermore, the inclined spaces 70C are wider than the inclined spaces 70D, and the opening angle of the front portions 70yA of the locking surfaces 70y of the upper guide members 70A and 70B is larger than the opening angle of the rear portions 70yB of the locking surfaces 70y. This allows the operator to easily insert the upper dustproof net 81 into the inclined spaces 70C and 70D.

[0080] As shown in FIG. 4(B), the net bracket 51A and the net bracket 51 are configured so that the central portions thereof protrude in the X1 direction compared to the upper and lower ends.

[0081] Therefore, even if an operator attempts to tilt the upper dustproof net 81 to an angle at which the upper end 81A of the upper dustproof net 81 protrudes from the notches 70K provided in each of the upper guide members 70A and 70B (the state indicated by the dashed line in FIG. 4(B)), the operator cannot tilt the upper dustproof net 81 to such an angle because the lower end 81B of the upper dustproof net 81 comes into contact with the central portions of the net brackets 51A and 51B.

[0082] Therefore, the above-described configuration can effectively prevent the upper end portion 81A of the upper dustproof net 81 from becoming in the state shown by the dashed line in Figure 4(B) when the worker inserts the upper dustproof net 81 into the inclined space 70D.

[0083] In the case where the central portions of the net brackets 51A and 51B do not protrude in the X1 direction, a member for limiting the insertion angle of the upper dustproof net 81 may be separately provided.

[0084] In the above example, the dustproof net 80 is attached to the net brackets 51A and 51B, but it may also be attached to the first frame member 41A and the second frame member 41B. The net brackets 51A and 51B may also be omitted. In this case, the first frame member 41A and the second frame member 41B function as brackets. Therefore, the upper guide members 70A, 70B and the lower guide members 71A, 71B are attached to the first frame member 41A and the second frame member 41B.

[0085] Next, a configuration example of the resin fastener CL will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view of the resin fastener CL for fastening the dustproof net 80 to the main body of the dustproof device 50. Specifically, FIG. 5(A) is an exploded perspective view of the resin fastener CL before the dustproof net 80 is fastened to the main body of the dustproof device 50, and FIG. 5(B) is an assembled perspective view of the resin fastener CL after the dustproof net 80 has been fastened to the main body of the dustproof device 50. FIG. 6 shows the state of the resin fastener CL after the dustproof net 80 has been fastened to the main body of the dustproof device 50. Specifically, FIG. 6(A) is a top view of the resin fastener CL after the dustproof net 80 has been fastened to the main body of the dustproof device 50. FIG. 6(B) is a view of a cross section of the resin fastener CL in an imaginary plane parallel to the XZ plane including the dashed dotted line L1 in FIG. 6(A), viewed from the Y1 side as indicated by the block arrow BA.

[0086] The resin fastener CL is configured to removably fasten the second member to the first member. In this embodiment, the resin fastener CL is a one-touch clip configured to attach the second member to the first member and detach the second member from the first member without using tools. The first member is a bridge plate 55. The bridge plate 55 is a metal member that constitutes the main body of the dustproof device 50 as an installed object. The second member is a frame body 83. The frame body 83 is a metal member that constitutes the dustproof net 80.

[0087] Specifically, the resin fastener CL has an outer member 90 that serves as a second member and is disposed on the outer side (the X1 side, which is the front side) of the frame body 83, and an inner member 91 that serves as a first member and is fixed to the intermediate plate 55 that serves as a first member and is disposed on the inner side (the X2 side, which is the rear side) of the frame body 83. In this embodiment, the outer member 90 and the inner member 91 are resin members that are configured to interlock with each other. The outer member 90 and the inner member 91 may be formed of the same resin material or different resin materials.

[0088] 5, the inner member 91 has an extending portion 91T, a base portion 91F, and a retaining portion 91C. The inner member 91 is fixed to the intermediate bridge plate 55 by inserting the retaining portion 91C into a through-hole 55H formed in the intermediate bridge plate 55. A nut NT is welded to the inside (the X2 side, which is the rear side) of the intermediate bridge plate 55, as shown in FIG. 5(B).

[0089] The retaining portion 91C is configured to be attached to the screw hole of the nut NT. In the example shown in Fig. 5, the retaining portion 91C made of synthetic resin is inserted into the screw hole of the nut NT.

[0090] Specifically, as shown in Fig. 7, the retaining portion 91C has a fitting structure 91E that fits into the screw hole when inserted into the screw hole. Fig. 7 is a diagram showing an example of the configuration of the inner member 91. Specifically, Fig. 7(A) is a top view of the inner member 91, and Fig. 7(B) is a left side view of the inner member 91.

[0091] The fitting structure 91E is a structure that prevents the retaining portion 91C inserted into the screw hole from coming out of the screw hole, and includes one or more protrusions. In the example shown in FIG. 7, the fitting structure 91E includes five protrusions (first protrusion 91E1 to fifth protrusion 91E5). Each of the first protrusion 91E1 to fifth protrusion 91E5 has an inverted truncated cone shape, and is configured so that its outer circumferential edge comes into contact with the inner wall of the screw hole and deforms. The "inverted truncated cone shape" refers to a shape in which the radius of the upper base on the side closer to the base 91F is larger than the radius of the lower base on the side farther from the base 91F. The screw hole is formed so that its diameter is slightly smaller than the diameter of each of the first protrusion 91E1 to fifth protrusion 91E5.

[0092] The base 91F is a portion formed between the retaining portion 91C and the extending portion 91T. In this embodiment, the base 91F functions as a stopper that prevents the retaining portion 91C from being inserted excessively into the screw hole. The base 91F also functions as a plug that prevents foreign matter such as water from entering the screw hole from the outside through the through hole 55H. For this reason, the base 91F is configured to have a size (installation area) larger than the opening of the through hole 55H in a front view.

[0093] In this embodiment, the inner member 91 has a constricted portion 91N between the retaining portion 91C and the base portion 91F. The constricted portion 91N is configured to allow the base portion 91F to tilt with respect to the retaining portion 91C. However, the constricted portion 91N may be omitted.

[0094] The extending portion 91T is configured to be able to come into contact with the outer member 90. In the example shown in FIG. 5(B), the extending portion 91T is configured to extend outward (in the X1 direction) while attached to the outer side (the X1 side, which is the front side) of the intermediate plate 55. The extending portion 91T is inserted into a through-hole 83H formed in the frame body 83. Specifically, the extending portion 91T is configured to extend through the frame body 83 and protrude to the outer side (the X1 side, which is the front side) of the frame body 83, as shown in FIG. 5(B). The through-hole 83H may be a notch.

[0095] As shown in Fig. 6, the extending portion 91T has an inner engaging portion 91G. The inner engaging portion 91G is configured to engage with an outer engaging portion 90L formed on the outer member 90. Specifically, as shown in Fig. 6(B), the inner engaging portion 91G includes eight convex portions (first convex portion 91G1 to eighth convex portion 91G8) formed on the upper surface (surface on the Z1 side) of the extending portion 91T.

[0096] The outer member 90 is configured to come into contact with the extending portion 91T that extends through the through-hole 83H formed in the frame body 83. In this embodiment, the outer member 90 has an outer wall portion 90W and an outer engagement portion 90L, as shown in FIG. 5(B).

[0097] 5(B), the outer wall portion 90W is configured so that its inner surface (the surface on the X2 side, which is the rear surface) comes into contact with the outer surface (the surface on the X1 side, which is the front surface) of the frame body 83. Specifically, the outer wall portion 90W is configured so that the frame body 83 can be fixed in place with the inner surface of the frame body 83 pressed against the outer surface of the intermediate plate 55.

[0098] The outer engaging portion 90L is configured to engage with an inner engaging portion 91G formed on the extending portion 91T of the inner member 91 when the outer member 90 and the inner member 91 are in contact with each other.

[0099] In the example shown in Figure 6, the outer member 90 is configured so that, when in contact with the extension portion 91T of the inner member 91 extending through the frame body 83, it can move in a direction toward the frame body 83 along the extension direction of the extension portion 91T (X-axis direction), but cannot move in a direction away from the frame body 83 along the extension direction of the extension portion 91T.

[0100] Specifically, the outer engaging portion 90L and the inner engaging portion 91G are configured to realize a ratchet mechanism. In the example shown in Fig. 6, the outer engaging portion 90L is configured to function as a ratchet pawl, and the inner engaging portion 91G is configured to function as a ratchet tooth.

[0101] More specifically, when the outer engagement portion 90L and the inner engagement portion 91G are engaged, the outer member 90 is configured to be movable in a direction toward the frame body 83 (X2 direction) along the extension direction of the extension portion 91T, and to be unable to move in a direction away from the frame body 83 (X1 direction) along the extension direction of the extension portion 91T.

[0102] In the example shown in FIG. 6(B), when the tip 90T of the outer engagement portion 90L is in contact with the vertical surface VS of the fifth convex portion 91G5, the outer member 90 cannot move in the X1 direction relative to the extension portion 91T, but can move in the X2 direction relative to the extension portion 91T. This is because the tip 90T cannot move in the X1 direction beyond the vertical surface VS of the fifth convex portion 91G5, but can slide on the inclined surface SL of the fourth convex portion 91G4 and move in the X2 direction. Note that FIG. 6(B) shows the state of the resin fastener CL when the tip 90T slides on the inclined surface SL of the fourth convex portion 91G4 and moves in the X2 direction, and then comes into contact with the vertical surface of the fourth convex portion 91G4. The dashed line 90La in FIG. 6(B) shows the state of the outer engagement portion 90L when the tip 90T slides on the inclined surface SL of the fourth convex portion 91G4. FIG. 6(B) shows the state of the resin fastener CL when the inner surface (X2-side surface) of the outer wall portion 90W of the outer member 90 contacts the outer surface (X1-side surface) of the frame body 83 and presses the frame body 83 against the intermediate bridge plate 55. In this state, movement of the outer member 90 in the X1 direction is restricted by contact between the tip end 90T and the vertical surface of the fourth protrusion 91G4, and movement in the X2 direction is restricted by contact between the inner surface of the outer wall portion 90W and the outer surface of the frame body 83. In this state, an operator can pinch both sides of the outer wall portion 90W to elastically deform the outer engagement portion 90L and warp the outer engagement portion 90L upward (in the Z1 direction). Specifically, an operator can simultaneously press the Y1-side and Y2-side side wall portions of the outer wall portion 90W inward to place the outer engagement portion 90L in the state shown by the figure 90La in FIG. 6(B). Therefore, the worker can release the engagement (contact) between the tip end portion 90T and the vertical surface of the fourth convex portion 91G4. Then, with the contact between the tip end portion 90T and the vertical surface of the fourth convex portion 91G4 released, the worker can move the outer member 90 in the X1 direction.

[0103] With this configuration, the worker can easily detach the outer member 90 from the inner member 91, and therefore can easily detach the dustproof net 80 from the main body of the dustproof device 50. In addition, with this configuration, the worker can repeatedly attach the dustproof net 80 to the main body of the dustproof device 50 and detach the dustproof net 80 from the main body of the dustproof device 50.

[0104] Next, an outer member 90A, which is another configuration example of the outer member 90, will be described with reference to Fig. 8. Fig. 8 is a diagram showing the configuration example of the outer member 90A. Specifically, Fig. 8(A) is a left side view of the outer member 90A, and Fig. 8(B) is a front view of the outer member 90A.

[0105] The outer member 90A differs from the outer member 90 in that it has a disengagement portion 90U, but in other respects is the same as the outer member 90. Therefore, in the following, a description of the common parts will be omitted and the different parts will be described in detail.

[0106] The disengaging portion 90U is configured to be able to disengage the engagement between the outer engaging portion 90L and the inner engaging portion 91G.

[0107] Specifically, the disengaging portion 90U extends outward (in the X1 direction) from the center of the outer engaging portion 90L and protrudes outward (in the X1 direction) from the outer end (the end on the X1 side) of the outer wall portion 90W. In the example shown in Fig. 8, the disengaging portion 90U is a lever configured to extend along the extending portion 91T of the inner member 91.

[0108] The operator can release the engagement between the outer engagement portion 90L and the inner engagement portion 91G by pushing the disengagement portion 90U upward (in the Z1 direction) as shown by arrow AR1 in Figure 8(A) and arrow AR2 in Figure 8(B).

[0109] When the engagement between the outer engaging portion 90L and the inner engaging portion 91G is released, the outer member 90 becomes movable in a direction away from the frame body 83 (X1 direction) along the extending direction of the extending portion 91T.

[0110] With this configuration, the worker can more easily remove the outer member 90 from the inner member 91, and therefore can more easily remove the dustproof net 80 from the main body of the dustproof device 50.

[0111] Next, a resin fastener CL1, which is another configuration example of the resin fastener CL, will be described with reference to Fig. 9. Fig. 9 is a diagram showing the configuration example of the resin fastener CL1. Specifically, Fig. 9 is a left side view of the resin fastener CL1.

[0112] The resin fastener CL1 differs from the resin fastener CL in that it has an outer member 90A and a connecting member 92, but is otherwise the same as the resin fastener CL. Therefore, in the following, a description of the common parts will be omitted and the different parts will be described in detail.

[0113] The connecting member 92 is a member for connecting the outer member 90A and the inner member 91. In the example shown in Fig. 9, the outer member 90A, the inner member 91, and the connecting member 92 are integrally injection molded from the same resin material.

[0114] Specifically, the connecting member 92 has one end connected to the outer wall portion 90W of the outer member 90A, and the other end connected to the base portion 91F of the inner member 91.

[0115] This configuration can prevent the outer member 90A from being lost when the outer member 90A is removed from the inner member 91.

[0116] As described above, the resin fastener CL according to the embodiment of the present invention is configured to detachably fasten an attachment member to an installation object. In the above embodiment, the installation object is the dust prevention device 50, and the attachment member is the frame 83 of the dust prevention net 80. The installation object may be a selector valve, a relay box, a battery, or the like. If the installation object is a selector valve, the attachment member may be a selector valve cover. If the installation object is a relay box, the attachment member may be a relay box cover. Alternatively, if the installation object is a battery, the attachment member may be a battery cover. The attachment member may be a member made of metal or a member made of synthetic resin.

[0117] The selector valve is a device for switching the operation method of the excavator's control lever, and is installed, for example, behind the cab 10. The relay box is a case that houses relays that make up the excavator's electrical system, and is installed behind the cab 10. The battery is, for example, a 24V battery for supplying DC voltage to various electrical devices mounted on the excavator, and is installed in the space between the exterior cover 33 and the dust prevention device 50.

[0118] In the above-described embodiment, the resin fastener CL includes an inner member 91 fixed to an installation object on one side and an outer member 90 arranged on the installation object so as to sandwich the mounting member. The inner member 91 has an extension portion 91T extending toward the other side, and the outer member 90 is configured so that, when in contact with the extension portion 91T, the outer member 90 is movable relative to the extension portion 91T in a direction toward the mounting member along the extension direction of the extension portion 91T, but is unable to move relative to the extension portion 91T in a direction away from the mounting member along the extension direction of the extension portion 91T. Specifically, the resin fastener CL includes the inner member 91 fixed to the main body (intermediate bridge plate 55) of the dustproof device 50 located inside the dustproof net 80 (frame body 83), and the outer member 90 arranged outside the dustproof net 80 (frame body 83). The inner member 91 is attached to the main body (intermediate bridge plate 55) of the dustproof device 50, and has an extending portion 91T that extends through the dustproof net 80 (frame body 83). The outer member 90 is configured so that, when in contact with the extending portion 91T, the outer member 90 is movable relative to the extending portion 91T in a direction approaching the dustproof net 80 (frame body 83) along the extending direction of the extending portion 91T, but is unable to move relative to the extending portion 91T in a direction away from the dustproof net 80 (frame body 83) along the extending direction of the extending portion 91T.

[0119] This configuration has the effect of suppressing damage to the mounting member caused by the fastener. This is because the fastener is made of a resin material, which prevents damage to the mounting member due to metal-to-metal contact. For the same reason, this configuration can suppress a decrease in the quality, such as the durability, of the dustproof net 80 used as the mounting member. Note that damage to the mounting member due to metal-to-metal contact includes, for example, damage to the painted surface of the mounting member. Furthermore, because the resin fastener CL is made of a resin material, it will not rust.

[0120] 6, the extension portion 91T may be configured to have an inner engagement portion 91G. The outer member 90 may have an outer engagement portion 90L configured to engage with the inner engagement portion 91G. In this case, when the inner engagement portion 91G and the outer engagement portion 90L are engaged with each other, the outer member 90 is configured to be movable relative to the extension portion 91T in a direction toward the frame body 83 along the extension direction of the extension portion 91T, but is unable to move relative to the extension portion 91T in a direction away from the frame body 83 along the extension direction of the extension portion 91T.

[0121] This configuration can prevent the fastening from loosening due to mechanical vibrations, as occurs in fastening with bolts, and therefore can prevent the outer member 90 from coming off the inner member 91 due to mechanical vibrations.

[0122] As shown in Fig. 8, the outer member 90 may have a disengagement portion 90U that disengages the inner engagement portion 91G and the outer engagement portion 90L. In the example shown in Fig. 8, the disengagement portion 90U is configured to allow an operator to easily disengage the engagement between the outer engagement portion 90L and the inner engagement portion 91G. When the engagement between the outer engagement portion 90L and the inner engagement portion 91G is released, the outer member 90 becomes movable in a direction away from the base portion 91F along the extension direction of the extension portion 91T.

[0123] With this configuration, an operator can easily remove the outer member 90 from the inner member 91, and therefore the dustproof net 80 can be easily removed from the main body of the dustproof device 50.

[0124] The inner member 91 may be fixed to an installation object via a retaining portion 91C. For example, as shown in Fig. 6, the inner member 91 may be fixed to the intermediate plate 55 constituting the main body of the dust prevention device 50 via the retaining portion 91C.

[0125] With this configuration, the worker can fix the inner member 91 to the intermediate plate 55, for example, by simply inserting the retaining portion 91C into the screw hole of the nut NT welded to the back surface (the rear X2 side) of the intermediate plate 55. Therefore, the worker can easily attach the dustproof net 80 to the main body of the dustproof device 50.

[0126] Furthermore, with this configuration, the worker can fix the inner member 91 to the intermediate plate 55 simply by inserting the retaining portion 91C into the screw hole of the nut NT welded in advance to the back surface of the intermediate plate 55, without using a special retainer or the like that is used when fastening with a sign fastener. Therefore, this configuration does not cause the problem of the special retainer coming off and falling off the intermediate plate 55.

[0127] The inner member 91 may be integrated into the installed object. For example, the inner member 91 may be provided in a state of being fixed in advance to the intermediate board 55. Alternatively, if the portion of the installed object to which the inner member 91 is fixed is formed of a resin material, the inner member 91 may be molded integrally with that portion of the installed object.

[0128] With this configuration, the worker can easily attach the dustproof net 80 to the main body of the dustproof device 50 by simply positioning the frame body 83 so that the extending portion 91T of the inner member 91, which has been fixed to the main body of the dustproof device 50 in advance, passes through the through-hole 83H formed in the frame body 83, and then attaching the outer member 90 to the extending portion 91T that passes through the through-hole 83H. In other words, the worker does not need to separately prepare the inner member 91 when attaching the dustproof net 80 to the main body of the dustproof device 50.

[0129] Furthermore, the outer member 90 may be integrated with the mounting member. For example, the outer member 90 may be provided in a state in which it is pre-fixed to the frame 83. Alternatively, if the mounting member is made of a resin material, the outer member 90 may be molded integrally with the mounting member.

[0130] With this configuration, the worker can easily attach the dustproof net 80 to the main body of the dustproof device 50 by simply attaching the outer member 90, which is fixed to the frame body 83 in advance, to the extension portion 91T that extends through the through-hole 83H. In other words, the worker does not need to prepare a separate outer member 90 when attaching the dustproof net 80 to the main body of the dustproof device 50.

[0131] Furthermore, the outer member 90 and the inner member 91 may be connected via a connecting member 92. For example, in the example shown in Fig. 9, an outer member 90A, which is an example of the outer member 90, and the inner member 91 are connected via a connecting member 92. This configuration can prevent the outer member 90A from being lost when the outer member 90A is detached from the inner member 91, that is, when the dustproof net 80 is detached from the main body of the dustproof device 50.

[0132] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the specific embodiments described above, and various modifications and changes are possible within the scope of the gist of the present invention as set forth in the claims.

[0133] For example, in the above-described embodiment, the inner engaging portion 91G is configured to have eight protrusions so as to be compatible with various mounting members having different thicknesses. However, the number of protrusions may be one.

[0134] Furthermore, in the above-described embodiment, the inner engagement portion 91G is a convex portion that protrudes upward (in the Z1 direction) from the upper surface (the surface on the Z1 side) of the extension portion 91T, but it may also be a concave portion or groove portion formed on the upper surface of the extension portion 91T.

[0135] Furthermore, in the above-described embodiment, the ratchet mechanism is configured so that the outer engagement portion 90L functions as a ratchet pawl and the inner engagement portion 91G functions as a ratchet tooth, but it may also be configured so that the outer engagement portion 90L functions as a ratchet tooth and the inner engagement portion 91G functions as a ratchet pawl. In this case, the disengaging portion 90U as shown in FIG. 8 may be provided on the inner member 91. Furthermore, the outer engagement portion 90L and the inner engagement portion 91G may form a movement limiting mechanism (a mechanism that limits the movement direction to one direction) other than a ratchet mechanism.

[0136] In the example shown in FIG. 8, the outer engagement portion 90L is configured to have only one tip portion 90T that can engage with eight protrusions (first protrusion 91G1 to eighth protrusion 91G8) formed on the upper surface (Z1 side surface) of the extension portion 91T. However, the outer engagement portion 90L may be configured to have multiple tip portions 90T. In the example shown in FIG. 10, the outer engagement portion 90L is configured to have three tip portions 90T (first tip portion 90T1 to third tip portion 90T3).

[0137] 10A and 10B are diagrams of a resin fastener CL for fastening the dustproof net 80 to the main body of the dustproof device 50. Specifically, FIG. 10A is an assembled perspective view of the resin fastener CL after the dustproof net 80 has been fastened to the main body of the dustproof device 50, and corresponds to FIG. 5B. FIG. 10B is a cross-sectional view of the resin fastener CL as viewed from the Y1 side, and corresponds to FIG. 6B. The inner member 91 shown in FIG. 10 is the same as the inner member 91 shown in FIG. 7. An outer member 90B shown in FIG. 10 is another example of the outer member 90. The outer member 90B has three distal end portions 90T (first to third distal end portions 90T1 to 90T3), and differs from the outer member 90A shown in FIG. 8 in other respects.

[0138] This configuration provides the advantage of being able to increase the engagement strength between the outer member 90 and the inner member 91.

[0139] In the example shown in FIG. 8 , the outer member 90A is configured to engage with the inner member 91 and is not configured to be fixed to the frame body 83. However, the outer member 90A may be configured to be fixed to the frame body 83. FIG. 11 shows an outer member 90C, another configuration example of the outer member 90, configured to be fastened to the frame body 83 with bolts. Specifically, the outer member 90C has flange portions 90F extending leftward (in the Y1 direction) and rightward (in the Y2 direction) from the lower end (the end on the X2 side) of the outer wall portion 90W. A through-hole 90H for receiving a bolt is formed in the center of the flange portion 90F. More specifically, the flange portion 90F includes a left flange portion 90FL and a right flange portion 90FR. A left through-hole 90HL for receiving a bolt is formed in the center of the left flange portion 90FL, and a right through-hole 90HR for receiving a bolt is formed in the center of the right flange portion 90FR. With this configuration, the worker can fix the outer member 90C to the frame body 83 of the dustproof net 80 before fixing the dustproof net 80 to the main body of the dustproof device 50.

[0140] In the example shown in FIG. 8, the outer member 90A is configured to have only one tip portion 90T extending continuously in the left-right direction (Y-axis direction). However, the outer member 90A may be configured to have multiple tip portions 90T arranged intermittently in the left-right direction (Y-axis direction). In the example shown in FIG. 11, the outer member 90C is configured to have two tip portions 90T (a left tip portion 90TL and a right tip portion 90TR) arranged intermittently in the left-right direction (Y-axis direction). Note that each of the left tip portion 90TL and the right tip portion 90TR may have multiple tip portions 90T arranged in the front-rear direction (X-axis direction), as in the example shown in FIG. 10(B).

[0141] This configuration has the effect of further increasing the engagement strength between the outer member 90 and the inner member 91. [Explanation of symbols]

[0142] DESCRIPTION OF SYMBOLS 1 Lower running body 2 Swing mechanism 3 Upper swing body 4 Boom 5 Arm 7 Boom cylinder 8 Arm cylinder 9 Bucket cylinder 10 Cab 11 Engine 31 Swing frame 32 Counterweight 33 Exterior cover 33A Maintenance door 33B Upper edge 34 Engine compartment 34a Engine hood 35 Cooling fan 36 Frame body 37 Support 38 Fixing base 39 Top cover 40 Heat exchanger 41 Frame 50 Dust prevention device 51A, 51B Net brackets 52A, 52B, 53A, 53B Inclined section 54 Reinforcing plate 55...Intermediate bridge plate 55H...Through hole 56...Placement portion 60...Exhaust gas treatment device 70A, 70B...Upper guide member 70x...Fixing surface 70y...Engaging surface (upper surface) 70K...Notch 71A, 71B...Lower guide member 71x...Fixing surface 71y...Engaging surface 74...Passage portion 80...Dustproof net 81...Upper dustproof net 82...Lower dustproof net 83...Frame 83H...Through hole 90, 90A to 90C...Outer member 90F...Flange portion 90FL...Left flange portion 90FR...Right flange portion 90H...Through hole 90HL...Left through hole 90HR...Right through hole 90L···Outer engagement portion 90T···Tip portion 90T1···First tip portion 90T2···Second tip portion 90T3···Third tip portion 90TL···Left tip portion 90TR···Right tip portion 90U···Disengagement portion 90W···Outer wall portion 91···Inner member 91C···Retaining portion 91E···Fitting structure 91E1···First convex portion 91E2···Second convex portion 91E3···Third convex portion 91E4···Fourth convex portion 91E5···Fifth convex portion 91F···Base portion 91G···Inner engagement portion 91G1···First convex portion 91G2···Second convex portion 91G3···Third convex portion 91G4···Fourth convex part 91G5···Fifth convex part 91G6···Sixth convex part 91G7···Seventh convex part 91G8···Eighth convex part 91N···Constricted part 91T···Extended part 92···Connecting part CL, CL1···Resin fixing tool F···Net part NT···NutS1, S2: Seal material W: Cooling air

Claims

1. A resin fixing device that detachably fixes a mounting member to an installation object, an inner member fixed to the installation object and a portion of which is disposed on the installation object side, the inner member being inside the mounting member; an outer member disposed outside the mounting member so as to sandwich the mounting member with respect to the installation object, the inner member has an extension portion that extends through the mounting member, a retaining portion that is inserted into a hole formed in the installation object and fixed thereto, and a base portion that is formed between the retaining portion and the extension portion, and the extension portion has a plurality of ratchet teeth that form part of a ratchet mechanism that is a mechanism that limits the direction of movement to one direction, the base portion has a size larger than the hole in a front view along the extension direction of the extension portion, the outer member has an outer wall portion through which the extension portion is inserted, and an elastically deformable ratchet pawl extending from the outer wall portion and engaging with the ratchet teeth, and is configured such that, when the ratchet teeth formed on the extension portion and the ratchet pawl are in contact with each other, the outer member is movable relative to the extension portion toward the mounting member along the extension direction of the extension portion, and is unable to move relative to the extension portion toward the mounting member along the extension direction of the extension portion, the installation object is an object to which the mounting member is detachably fixed by the resin fixing device, The mounting member is a member fixed to the installation object by the resin fixing device. Resin fixings.

2. The extension portion has an inner engagement portion, the outer member has an outer engagement portion configured to mate with the inner engagement portion; The resin fixture according to claim 1.

3. The outer member has an engagement release portion that releases the engagement between the inner engagement portion and the outer engagement portion. The resin fixture according to claim 2.

4. The inner member is fixed to the installation object via the retaining portion. The resin fixture according to any one of claims 1 to 3.

5. The inner member is integrated into the installation. The resin fixture according to any one of claims 1 to 4.

6. The inner member and the outer member are connected via a connecting member. The resin fixture according to any one of claims 1 to 5.

7. a lower running body; an upper rotating body rotatably mounted on the lower traveling body; An installation object installed on the upper rotating body; a mounting member that is attached to the installation object; A construction machine comprising: a resin fixing device that detachably fixes the mounting member to the installation object, the resin fixing device includes an inner member that is fixed to the installation object and has a portion disposed on the installation object side, the portion being inside the mounting member, and an outer member that is disposed outside the mounting member so as to sandwich the mounting member with respect to the installation object, the inner member is attached to the installation object and has an extension portion that extends through the attachment member, a retaining portion that is inserted into a hole formed in the installation object and fixed thereto, and a base portion that is formed between the retaining portion and the extension portion, and the extension portion has a plurality of ratchet teeth that form part of a ratchet mechanism that is a mechanism that limits the direction of movement to one direction, the base portion has a size larger than the hole in a front view along the extension direction of the extension portion, the outer member has an outer wall portion through which the extension portion is inserted, and an elastically deformable ratchet pawl extending from the outer wall portion and engaging with the ratchet teeth, and is configured such that when the ratchet teeth formed on the extension portion extending through the mounting member are in contact with the ratchet pawl, the outer member is movable toward the mounting member along the extension direction of the extension portion, but is unable to move away from the mounting member along the extension direction of the extension portion; the installation object is an object to which the mounting member is detachably fixed by the resin fixing device, The mounting member is a member fixed to the installation object by the resin fixing device. Construction machinery.

8. An inner member of a resin fastener according to any one of claims 1 to 6.

9. An outer member of the resin fastener according to any one of claims 1 to 6.

Images