Shovel

Abstract

To provide a shovel capable of suppressing water accumulated on a hood from adhering to a water prohibition member in a housing upon opening the hood.SOLUTION: A shovel of an aspect of the present invention comprises: a lower traveling body; a revolving super structure revolvably mounted on the lower traveling body; a housing disposed behind the revolving super structure, and having an opening formed on an upper surface; a hood openably covering the opening; a water prohibition member disposed inside of the housing; and a stopping member stopping water dropping from the hood upon opening the hood to which the water has adhered from flowing toward the opening.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] This disclosure relates to an excavator.

Background Art

[0002] An excavator having an openable hood is known for performing maintenance on a housing covering a swing frame provided with an engine or the like.

[0003] For example, Patent Document 1 discloses an excavator having an upper swing body, a housing installed on the upper swing body, a hood rotatably attached to the housing, a support side stay supporting the hood, a guide portion attached to the hood and guiding the sliding of one end of the support side stay, and an operation side stay rotatably connected to the support side stay.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When opening the hood of such an excavator with a wet hood due to rain, a part of the rainwater accumulated on the hood may enter the housing, and if the rainwater adheres to water - sensitive members such as electrical equipment in the housing, it may cause a failure.

[0006] Therefore, it is desirable to provide an excavator capable of suppressing the water accumulated on the hood from adhering to the water - sensitive members when the hood is opened.

Means for Solving the Problems

[0007] An excavator according to one aspect of the present disclosure includes a lower traveling body, an upper slewing body rotatably mounted on the lower traveling body, a housing provided behind the upper slewing body and having an opening formed on its upper surface, a hood that can open and close the opening, a water-blocking member provided in the housing, and a blocking member that blocks water dripping from the hood when the hood with water attached is opened from flowing toward the opening.

Advantages of the Invention

[0008] One aspect of the present disclosure can suppress water accumulated on the hood from adhering to the water-blocking member when the hood is opened.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0010] Hereinafter, non-limiting embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members or components are given the same or corresponding reference numerals. Also, hereinafter, duplicate descriptions of the same or corresponding members or components will be omitted. Further, in the drawings, the members or components are not necessarily drawn to scale. Therefore, those skilled in the art can arbitrarily determine specific dimensions with reference to the following non-limiting embodiments. Also, the following embodiments are illustrative rather than limiting the invention. Also, the features in the embodiments and their combinations are not necessarily essential to the invention.

[0011] FIG. 1 is a side view of an excavator 100 according to an embodiment, FIG. 2 is a perspective view schematically showing the rear part of the upper swing body 2, and FIG. 3 is a top view of the upper swing body 2 according to an embodiment. In FIG. 3, the illustration of the upper surface of the housing 2a is omitted so that the inside of the housing 2a can be seen. The excavator 100 includes a lower traveling body 1, an upper swing body 2 rotatably mounted on the lower traveling body 1, a housing 2a provided behind the upper swing body 2 and having an opening 2c (see FIG. 4) formed on the upper surface, a hood 2b that can open and close the opening 2c, and a prime mover 8 (see FIG. 3) provided inside the housing 2a. The excavator 100 also includes a cab 3 provided on the front left side of the upper swing body 2 and a counterweight CW provided behind the upper swing body 2 and behind a rear frame 40 (see FIG. 4) described later.

[0012] At the front center of the upper swing body 2, a boom 4 is rotatably connected, and at the tip of the boom 4, an arm 5 is rotatably connected. Further, at the tip of the arm 5, a bucket 6 is rotatably connected. Also, a hood 2b is attached to the upper part of the housing 2a. In this embodiment, the hood 2b is configured to be rotatable (openable and closable), a radiator cover CV1 is disposed on the left side (Y1 side) of the hood 2b, and an exhaust gas treatment device cover CV2 is disposed on the right side (Y2 side) of the hood 2b. Note that the radiator cover CV1 and the exhaust gas treatment device cover CV2 are configured not to be rotatable (openable and closable), but may be configured to be rotatable (openable and closable). The housing 2a is disposed behind the rear frame 40 below the hood 2b, and includes a plate portion 2d that covers at least the upper part of the rear frame 40 and a counter cover CV3 that covers the counterweight CW.

[0013] As shown in FIG. 3, an engine room 7 is formed in the housing 2a of the upper swing body 2, and a prime mover 8 and a generator 8a are installed in the engine room 7. Also, a cooling fan 12 is installed on the Y1 side of the prime mover 8, and a heat exchanger unit 13 including a radiator or the like is installed on the Y1 side of the cooling fan 12. Further, a hydraulic pump 14 is installed on the Y2 side of the prime mover 8. Note that the rotational force of the prime mover 8 is transmitted to each of the generator 8a and the cooling fan 12 via a belt 8b, and is also transmitted to the hydraulic pump 14 via a transmission. As the prime mover 8, for example, an internal combustion engine such as a diesel engine, a gasoline engine, or a hydrogen engine, or an electric motor or the like can be used. When an electric motor is used as the prime mover, the hydraulic pump 14 may be driven by an electric motor driven by electric power from a power storage device. As the power storage device, a fuel cell, a lithium ion battery, or the like may be used. Also, the prime mover 8 is not limited to one, and may be a combination of two or more prime movers 8.

[0014] The excavator 100 has a water - prohibited member NW provided inside the housing 2a. The water - prohibited member NW refers to a member that may malfunction when water adheres to it, and examples include a compressor 15 and connectors attached to electrical equipment, etc.

[0015] The excavator 100 may have a compressor 15 provided on the left side (Y1 side) in the vehicle width direction of the prime mover 8 inside the housing 2a. The compressor 15 compresses the refrigerant in the heat pump cycle of an air conditioner (not shown) as a comfort equipment system of the excavator 100. The compressor 15 includes, for example, a built - in electric motor and an inverter circuit for driving the electric motor, etc., and is electrically driven by electric power supplied from a battery 16 or the like. The refrigerant compressed by the compressor 15 is sent to a condenser 17 during the cooling operation of the air conditioner.

[0016] An oil pan 8c for storing engine oil is provided at the lower part of the prime mover 8. And an oil level gauge 8d for measuring the amount of engine oil is attached to the Y2 side of the prime mover 8.

[0017] The prime mover 8 inhales outside air through an air filter 9a and an intake pipe 9b installed outside the engine room 7. Further, an exhaust pipe 9c is connected to the prime mover 8, and an exhaust gas treatment device 10 for purifying nitrogen oxides (hereinafter referred to as "NOx") in the engine exhaust gas is installed on the downstream side of the exhaust pipe 9c.

[0018] In this embodiment, the exhaust gas treatment device 10 is a urea - selective reduction type NOx treatment device that uses aqueous urea as a reducing agent. The exhaust gas treatment device 10 injects aqueous urea upstream of a reduction catalyst (not shown) provided in the exhaust pipe 9c to reduce NOx in the exhaust gas, and promotes this reduction reaction by the reduction catalyst to detoxify NOx.

[0019] The urea water tank 20 is a container for storing urea water, and in the upper revolving body 2, it is arranged on the opposite side of the cab 3 across the boom 4 (the Y2 side of the boom 4). Further, a fuel tank 19 is arranged behind (the X2 side) of the urea water tank 20, and a hydraulic oil tank 18 is arranged behind (the X2 side) of the fuel tank 19. Also, the hydraulic oil tank 18, the fuel tank 19, and the urea water tank 20 are installed outside the engine room 7. The urea water tank 20 is connected to the exhaust gas treatment device 10 via a urea water hose 69, a urea water supply pump 70, and the like.

[0020] FIG. 4 is a perspective view of a main part in a state where the hood 2b according to an embodiment is opened, FIG. 5 is a side view of a main part in a state where the hood 2b according to an embodiment is opened, FIG. 6 is an enlarged view of the main part in FIG. 4, FIG. 7 is an enlarged view of a portion surrounded by an ellipse in FIG. 5, FIG. 8 is an enlarged view of a second return part 24 according to an embodiment, and FIG. 9 is a side view showing the relationship among the hood 2b, the rear frame 40, the drainage member 50, and the plate part 2d in a state where the hood 2b according to an embodiment is closed. FIGS. 4 and 5 show a state where the hood 2b is fully opened.

[0021] As shown in FIG. 4, a handle 31, an assist mechanism 32, a support side stay 33, and a guide plate 34 are attached to the hood 2b.

[0022] In this embodiment, the hood 2b is rotatably attached around a rotation axis of a hinge 21 attached to the housing 2a. The opening angle of the hood 2b is, for example, about 45° in the fully opened state. Note that the opening angle of the hood 2b in the fully closed state is 0°.

[0023] The assist mechanism 32 is a mechanism that assists the operator in lifting the hood 2b (opening operation). In the present embodiment, the assist mechanism 32 is a lift assist damper composed of a gas pressure cylinder. The gas pressure cylinder is typically an inverted gas pressure cylinder in which the head side end (upper end) is rotatably and non-relatively movably attached to the hood 2b, and the rod side end (lower end) is rotatably and non-relatively movably attached to the bracket 35 (rear frame 40). The inverted gas pressure cylinder is adopted to enhance the sealing performance of the gas contained in the cylinder. That is, the inverted gas pressure cylinder is configured such that the oil for sealing the gas in the cylinder is located below the gas in the cylinder, thereby enhancing the sealing performance of the gas contained in the cylinder. However, the gas pressure cylinder constituting the assist mechanism 32 may be an upright gas pressure cylinder in which the head side end (lower end) is rotatably and non-relatively movably attached to the bracket 35 (rear frame 40), and the rod side end (upper end) is rotatably and non-relatively movably attached to the housing 2a. Also, in the example shown in FIG. 4, the assist mechanism 32 is composed of one gas pressure cylinder, but it may be composed of a pair of left and right two gas pressure cylinders, or may be composed of a combination of three or more gas pressure cylinders. Further, the upper end of the gas pressure cylinder may be attached to the hood 2b via a universal joint such as a ball joint.

[0024] As shown in FIG. 4, the support side stay 33 is configured to be able to support the hood 2b in an open state. In the present embodiment, the lower end of the support side stay 33 is rotatably and non-relatively movably attached to the bracket 36, and the upper end is relatively movably attached to the guide plate 34.

[0025] As shown in FIGS. 4 to 7, the excavator 100 has a weir member 42 that blocks the water dripping from the hood 2b when the hood 2b with water adhering to it is opened from flowing toward the opening 2c. With this configuration, during rainy weather, the rainwater (water) accumulated on the hood 2b slides on the surface of the hood 2b when the hood 2b is opened and falls from the rear end 25 (see FIG. 7) of the hood 2b and is received by the weir member 42. Therefore, the excavator 100 can suppress the water accumulated on the hood 2b from adhering to the water cutoff member NW when the hood 2b is opened.

[0026] The excavator 100 may have a rear frame 40 that is disposed behind the water cutoff member NW and supports the hood 2b. The hood 2b is rotatably attached to the rear frame 40. The hood 2b is attached to the rear frame 40 via a hinge 21, for example. Further, the rear frame 40 may include the weir member 42.

[0027] With this configuration, during rainy weather, the rainwater (water) accumulated on the hood 2b slides on the surface of the hood 2b when the hood 2b is opened and falls from the rear end 25 of the hood 2b and is received by the weir member 42 behind the water cutoff member NW. Therefore, the excavator 100 can further suppress the water accumulated on the hood 2b from adhering to the water cutoff member NW when the hood 2b is opened.

[0028] As shown in FIGS. 4 to 7, the rear frame 40 further includes a frame main body portion 41 that extends in the vertical direction. The weir member 42 projects forward (in the X1 direction) from the upper end of the frame main body portion 41 and extends in the vehicle width direction (Y1 - Y2 direction). The weir member 42 includes a water receiving portion 43 and a first return portion 44. The water receiving portion 43 projects upward (in the Z1 direction) from the front end (the end portion in the X1 direction) of the water receiving portion 43 and extends in the vehicle width direction. The hood 2b is rotatably attached to the water receiving portion 43. For example, the hood 2b is attached to the water receiving portion 43 via a hinge 21. The first return portion 44 is provided on the rear side (X2 side) of the water shutoff member NW in the front - rear direction (X1 - X2 direction) of the upper swing body 2.

[0029] With this configuration, during rainy weather, when the hood 2b is opened, the rainwater accumulated on the hood 2b slides on the surface of the hood 2b and falls from the rear end 25 of the hood 2b, and is received by the water receiving portion 43. Since the first return portion 44 is provided on the rear side of the water shutoff member NW and extends in the vehicle width direction, the rainwater received by the water receiving portion 43 is blocked by the first return portion 44 and is suppressed from flowing forward. Therefore, the shovel 100 can suppress rainwater from falling onto the water shutoff member NW disposed at least directly below the hood 2b.

[0030] The first return portion 44 may be provided on the rear side of the water shutoff member NW and the prime mover 8 in the front - rear direction of the upper swing body 2.

[0031] In the example shown in FIG. 4, the water receiving portion 43 has a notch portion 45 so as to avoid the assist mechanism 32, and the first return portion 44 is also provided at the edge of the notch portion 45.

[0032] The frame main body portion 41 is a perforated plate member. The material of the frame main body portion 41 may be any material that can ensure the strength to support the hood 2b. For example, steel can be used. The frame main body portion 41 is fixed to a swing frame (not shown) provided below the frame main body portion 41 (in the Z2 direction).

[0033] As shown in FIGS. 4 to 7, in plan view, the water receiving portion 43 overlaps with the rear end 25 of the hood 2b in a state where the hood 2b is fully opened. The water receiving portion 43 may be in a flat plate shape. Further, the water receiving portion 43 may be arranged horizontally, or may be arranged to be inclined in one direction in the vehicle width direction. For example, the water receiving portion 43 may be arranged to be inclined such that the end portion on the left side (Y1 side) in the vehicle width direction is located below the end portion on the right side (Y2 side) in the vehicle width direction.

[0034] The first return portion 44 may be provided perpendicular to the water receiving portion 43, or may be provided to be inclined forward or backward. The angle formed by the first return portion 44 and the water receiving portion 43 is preferably 45° to 90°. Thereby, it is possible to easily block the rainwater with the first return portion 44.

[0035] In the vehicle width direction, the end portion on the left side in the vehicle width direction of the first return portion 44 may be located outside the prime mover 8, and the end portion on the right side in the vehicle width direction may be located inside the prime mover 8. Thereby, the rainwater received by the water receiving portion 43 can be blocked by the first return portion 44 also on the left side in the vehicle width direction of the prime mover 8, so that it is possible to suppress the rainwater from falling on the water cutoff member NW provided on the left side in the vehicle width direction of the prime mover 8. Therefore, the excavator 100 can suppress the failure caused by the adhesion of rainwater to the water cutoff member NW.

[0036] From the viewpoint of preventing interference with the hood 2b, the first return portion 44 is arranged below the inner surface of the hood 2b or a member provided on the inner surface of the hood 2b.

[0037] The excavator 100 may have a drainage member 50 that is connected to the end in the vehicle width direction in the water receiving portion 43 and discharges the water flowing along the water receiving portion 43 to the rear of the frame body portion 41. That is, the weir member 42 and the drainage member 50 form a continuous flow path. In the illustrated example, the drainage member 50 is a gutter-shaped member. With this configuration, the rainwater received by the water receiving portion 43 is blocked by the first return portion 44 and discharged rearward (in the X2 direction) from the frame body portion 41 via the drainage member 50. Therefore, the excavator 100 can further suppress the rainwater accumulated on the hood 2b from adhering to the water shutoff member NW when the hood 2b is opened. Note that the drainage member 50 may be connected to the end on the right side in the vehicle width direction in the water receiving portion 43 or may be connected to the ends on both sides in the vehicle width direction according to the arrangement of the water shutoff member NW. The excavator 100 may have two drainage members 50, and the drainage members 50 may be connected to the ends on both sides in the vehicle width direction in the water receiving portion 43. Specifically, the drainage member 50 may be joined to the end face at one end or both ends in the vehicle width direction of the water receiving portion 43.

[0038] From the viewpoint of preventing interference with the hood 2b, the drainage member 50 is disposed below the inner surface of the hood 2b or a member provided on the inner surface of the hood 2b when the hood 2b is closed.

[0039] The rear end of the drainage member 50 may be disposed between the rear frame 40 and the counterweight CW. Specifically, as shown in FIG. 7, a gap S is formed between the rear frame 40 and the plate portion 2d, and the rear end of the drainage member 50 may be disposed in the gap S. With this configuration, the excavator 100 can discharge rainwater while avoiding the equipment provided in the housing 2a and the counterweight CW. The rainwater discharged into the gap S flows, for example, onto the swing frame disposed below the rear end of the drainage member 50 or toward the ground.

[0040] The drainage member 50 is preferably disposed above the compressor 15. With this configuration, it is possible to suppress rainwater received by the water receiving portion 43 from falling onto the compressor 15. Therefore, the excavator 100 can suppress the compressor 15 from malfunctioning due to rainwater adhering thereto.

[0041] As shown in FIG. 7, the drainage member 50 includes a semi-cylindrical portion 51 connected to the end portion in the vehicle width direction in the water receiving portion 43, and a side wall portion 52 provided at one end of the semi-cylindrical portion 51. Further, the upper end of the semi-cylindrical portion 51 is disposed at a height equal to or lower than the upper surface of the water receiving portion 43, and the rear end of the drainage member 50 is disposed behind the frame main body portion 41. With this configuration, rainwater received by the water receiving portion 43 naturally enters the semi-cylindrical portion 51, flows toward the rear end of the drainage member 50, and is discharged behind the frame main body portion 41. Therefore, the excavator 100 can further suppress rainwater accumulated on the hood 2b from adhering to the water shutoff member NW when the hood 2b is opened. Further, since the semi-cylindrical portion 51 is open upward in the vertical direction, even if fallen leaves or the like flow in together with the rainwater, the rainwater can be surely discharged. Note that the semi-cylindrical portion 51 may be connected to the end portion on the right side in the vehicle width direction in the water receiving portion 43 or may be connected to the end portions on both sides in the vehicle width direction according to the arrangement of the water shutoff member NW. The excavator 100 may have two drainage members 50, and the semi-cylindrical portion 51 may be connected to the end portions on both sides in the vehicle width direction in the water receiving portion 43. Specifically, the semi-cylindrical portion 51 may be joined to the end surface at one end or both ends in the vehicle width direction of the water receiving portion 43.

[0042] The cross-sectional shape of the semi-cylindrical portion 51 may be a U-shape. The rear end of the semi-cylindrical portion 51 (the rear end of the drainage member 50) may be inclined so as to be positioned below the front end of the semi-cylindrical portion 51 (the end portion on the side wall portion 52 side). Further, as shown in FIG. 6, the front surface 521 of the side wall portion 52 may be flush with the front surface 441 of the first folded-back portion 44, but may be behind the front surface 441 of the first folded-back portion 44, or may be arranged in front of the front surface 441 of the first folded-back portion 44. Note that the drainage member 50 may not include the semi-cylindrical portion 51 and the side wall portion 52, and may be, for example, a flexible tube or the like connected to a drainage hole formed in the water receiving portion 43.

[0043] As shown in FIGS. 7 and 8, the plate portion 2d includes a flat portion 22 connected to the upper surface of the water receiving portion 43, a curved portion 23 extending downward from the rear end of the flat portion 22, and a second folded-back portion 24 protruding upward from the front end of the flat portion 22 with respect to the flat portion 22 and extending in the vehicle width direction.

[0044] With this configuration, when the hood 2b is opened, the rainwater that has fallen onto the plate portion 2d from the rear end portion of the hood 2b is blocked by the second folded-back portion 24, so this configuration can suppress the rainwater from flowing forward. Therefore, the shovel 100 can further suppress the rainwater accumulated on the hood 2b from adhering to the water cutoff member NW when the hood 2b is opened. Also, even when the hood 2b is in the closed state, this configuration can suppress the rainwater from flowing forward.

[0045] The second folded-back portion 24 may be provided perpendicular to the flat portion 22, or may be provided inclined forward or backward. The angle formed by the second folded-back portion 24 and the flat portion 22 is preferably greater than 90°. Thereby, the rainwater falling from the rear end portion of the hood 2b can be received up to a more forward position, and the rainwater flowing toward the first folded-back portion 44 can be reduced. The angle formed by the second folded-back portion 24 and the flat portion 22 may be, for example, 135°.

[0046] In the example shown in FIG. 7, in a state where the hood 2b is fully opened, the front end 26 of the second return portion 24 is disposed behind the rear end 25 of the hood 2b, but it may be disposed in front of the rear end 25 of the hood 2b. Further, as shown in FIG. 9, in a state where the hood 2b is closed, the front end 26 of the second return portion 24 is preferably disposed in front of the rear end 25 of the hood 2b. With this configuration, rainwater falling from the rear end 25 of the hood 2b onto the plate portion 2d can be received, and the rainwater flowing toward the first return portion 44 can be reduced. Therefore, the shovel 100 can suppress rainwater accumulated on the hood 2b from adhering to the water cutoff member NW not only when the hood 2b is opened but also when it is closed.

[0047] The shovel 100 may have a seal cushion (not shown) provided between the counterweight CW and the plate portion 2d. Thereby, it is possible to suppress rainwater from flowing into the space between the counterweight CW in the housing 2a and the plate portion 2d from the upper surface of the counter cover CV3.

Explanation of Signs

[0048] 100 Shovel 1 Lower Traveling Body 2 Upper Swing Body 2a Housing 2b Hood 2c Opening 2d Plate Portion 21 Hinge 22 Flat Portion 23 Curved Portion 24 Second Return Portion 25 Rear End of Hood 26 Front End of Second Return Portion 3 Cab 4 Boom 5 Arm 6 Bucket 8 Prime Mover 15 Compressor 40 Rear Frame 41 Frame Main Body Portion 42 Weir Member 43 Water Receiving Portion 44 First return part 50 Drainage member 51 Semi-cylindrical part 52 Side wall part CW Counterweight NW Water shut-off member S Gap

Claims

1. A lower traveling body, an upper slewing body rotatably mounted on the lower traveling body, a housing provided on the upper slewing body and having an opening formed on its upper surface, a hood that can open and close the opening, a water-proof member provided inside the housing, a weir member that dams up the water dripping from the hood when the hood with water adhering to it is opened from flowing toward the opening, and an excavator.

2. It has a rear frame that is arranged behind the water-proof member and supports the hood, the hood is rotatably attached to the rear frame, the rear frame includes the weir member, and the excavator according to Claim 1.

3. The rear frame includes a frame main body portion extending in the vertical direction, the weir member includes a water receiving portion that protrudes forward from the upper end of the frame main body portion and extends in the vehicle width direction, and a first return portion that rises from the front end of the water receiving portion and extends in the vehicle width direction, the hood is rotatably attached to the water receiving portion, the first return portion is provided on the rear side of the water-proof member in the front-rear direction of the upper slewing body, and the excavator according to Claim 2.

4. The rear frame includes a frame main body portion extending in the vertical direction, the weir member includes a water receiving portion that protrudes forward from the upper end of the frame main body portion and extends in the vehicle width direction, and a first return portion that rises from the front end of the water receiving portion and extends in the vehicle width direction, the hood is rotatably attached to the water receiving portion, the water receiving portion has a drainage member that is connected to an end portion in the vehicle width direction of the water receiving portion and discharges the water flowing along the water receiving portion to the rear of the frame main body portion, and the excavator according to Claim 2.

5. The drainage member includes a semi-cylindrical portion connected to an end portion in the vehicle width direction of the water receiving portion, and a side wall portion provided at one end of the semi-cylindrical portion, the upper end of the semi-cylindrical portion is arranged at a height equal to or lower than the upper surface of the water receiving portion, the rear end of the drainage member is arranged behind the frame main body portion, and the excavator according to Claim 4.

6. The housing is arranged behind the rear frame and includes a plate portion that covers at least the upper portion of the rear frame, The plate portion includes a flat portion connected to the upper surface of the water receiving portion, a curved portion extending downward from the rear end of the flat portion, and a second return portion protruding upward from the front end of the flat portion and extending in the vehicle width direction. The excavator according to claim 5.

7. In a state where the hood is closed, the front end of the second return portion is disposed in front of the rear end of the hood. The excavator according to claim 6.

8. It has a counterweight provided behind the rear frame of the upper swing body. The rear end of the drainage member is disposed between the rear frame and the counterweight. The excavator according to claim 7.

9. A gap is formed between the rear frame and the plate portion. The rear end of the drainage member is disposed in the gap. The excavator according to claim 8.

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