Walking type work machine

Abstract

To provide a walking type work machine capable of performing height adjustment of a skid efficiently and without troublesomeness while maintaining the adjustment position correctly.SOLUTION: A walking type work machine is equipped with a support mechanism 30 for supporting a skid 9 for imparting resistance to the movement of a machine body accompanying work so as to change the position in a vertical direction, and hold the position at any vertical position. The support mechanism 30 includes a holding member to hold the skid 9 so as to move it vertically, a plurality of locking grooves 32 formed in the skid 9 with an interval in a vertical direction, and a locking pin 33 which is put into any of the plurality of locking grooves 32 and locked for regulating the vertical movement of the skid 9. The locking grooves 32 are formed into an inclined posture in which they are positioned lower toward the depth side with respect to a direction orthogonal to the vertical movement direction of the skid 9.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a walk-behind working machine, such as a walk-behind cultivator. [Background technology]

[0002] A walk-behind cultivator, which is an example of a walk-behind working machine, is provided with a rotary tilling device, which is an example of a working device, at the rear of the traveling body, and a resistance rod, which applies resistance to the movement of the machine body during work and determines the working depth of the tilling device, is provided at the rear of the tilling device so that its vertical position can be changed and adjusted. Conventionally, the resistance rod is provided in a state where it is inserted into a square cylindrical bracket, and a removable fixing pin is provided that penetrates the bracket in the left-right direction, and a plurality of insertion holes through which the fixing pin is inserted are formed in the resistance rod at intervals in the vertical direction, and when adjusting the position, the fixing pin is removed and then the resistance rod is shifted in the vertical direction, and the fixing pin is inserted again to fix the resistance rod in the changed position (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-201960 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described conventional configuration, when changing the height of the resistance rod, it was necessary to remove the fixing pin with one hand and then move the resistance rod up and down with the other hand to adjust its position, which was a time-consuming task and had the disadvantage of reducing work efficiency.

[0005] An object of the present invention is to provide a walk-behind work machine that allows the height of the resistance bar to be adjusted efficiently and without hassle while still maintaining the adjustment position properly. [Means for solving the problem]

[0006] The characteristic configuration of the walk-behind working machine of the present invention is that it is equipped with a working device for performing ground work, a resistance bar that provides resistance to the movement of the machine body associated with work, and a support mechanism that supports the resistance bar so that its position can be changed in the vertical direction and can be maintained in any vertical position, and the support mechanism comprises a holding member that holds the resistance bar so that it can be moved up and down, a number of locking grooves formed in the resistance bar at intervals in the vertical direction, and a locking pin provided on the holding member that enters and locks into one of the multiple locking grooves to regulate the vertical movement of the resistance bar.

[0007] According to the present invention, the vertical position can be changed by moving the resistance rod back and forth so that the locking state between the locking pin and the locking groove is released, and then moving the resistance rod vertically to lock the locking pin in the locking groove corresponding to the desired vertical position. As a result, it is possible to perform the operation with only one hand, for example, and the operation can be performed efficiently without cumbersomeness.

[0008] It is therefore possible to provide a walk-behind working machine that allows the resistance bar height to be adjusted efficiently and without hassle while maintaining the adjustment position properly.

[0009] In the present invention, it is preferable that the engagement groove is formed in an inclined position so that the deeper the groove is, the lower the groove is in a direction perpendicular to the vertical movement direction of the resistance bar.

[0010] According to this configuration, the locking groove is inclined so that it is positioned lower toward the back in a direction perpendicular to the up and down movement direction of the resistance rod. Therefore, even if an external force acts on the resistance rod during work, moving it back and forth, the locking pin is less likely to come out of the locking groove, and the adjusted position can be maintained.

[0011] In the present invention, it is preferable that a convex portion protruding upward is formed on the lower inner edge of the engagement groove at an inlet side portion.

[0012] According to this configuration, when the locking pin is locked in the locking groove, even if an external force is applied in a direction that causes the locking pin to come out of the locking groove, the protrusion resists the movement, making it difficult for the locking pin to move. As a result, it becomes even more difficult for the locking pin to come out of the locking groove.

[0013] In the present invention, it is preferable that a recess recessed downward is formed in a rear portion of a lower inner edge of the engagement groove.

[0014] According to this configuration, when the locking pin is engaged in the locking groove, the locking pin is engaged in the recess formed in the rear part, so that even if an external force is applied in a direction in which the locking pin is removed from the locking groove, the locking pin is unlikely to come out of the recess. As a result, the locking pin is even more unlikely to come out of the locking groove.

[0015] In the present invention, it is preferable to provide a biasing mechanism that biases the resistance rod in a direction in which the locking pin enters the locking groove.

[0016] According to this configuration, even if an external force is applied to the resistance rod in a direction that causes the locking pin to come out of the locking groove, the movement can be prevented by the biasing force of the biasing mechanism, making it difficult for the locking pin to come out of the locking groove.

[0017] In the present invention, it is preferable that a movement space is formed in the holding member to allow movement of the resistance rod in a direction in which the locking pin comes out of the locking groove.

[0018] According to this configuration, when changing the vertical position of the resistance rod, the resistance rod can be moved manually using the movement space to release the engagement between the locking pin and the locking groove. After releasing the locking state in this way, the resistance rod can be slid up or down to lock the locking pin in another locking groove. This allows the vertical position of the resistance rod to be adjusted. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is an overall side view of the walk-behind working machine. [Diagram 2] FIG. 4 is a side view showing a support structure for the resistance rod. [Diagram 3] FIG. 4 is a vertical cross-sectional side view showing a support structure for a resistance rod. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 3 is a cross-sectional view taken along line VV in FIG. 2. [Figure 6] FIG. [Figure 7] FIG. 11 is a side view of a locking groove according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of a walk-behind cultivator, which is an example of a walk-behind working machine according to the present invention, will be described with reference to the drawings. The present invention is not limited to the following embodiment, and various modifications are possible without departing from the scope of the present invention.

[0021] In addition, unless otherwise specified, the front-rear and left-right directions in the description of this embodiment are described as follows: In other words, the forward traveling direction (see arrow FR in FIG. 1) when the walk-behind cultivator is working is "forward," and the backward traveling direction (see arrow BK in FIG. 1) is "rear."

[0022] [Overall structure] As shown in Fig. 1, the running body of the walk-behind cultivator has an engine 11, which serves as a drive source, mounted on an engine frame 10 that constitutes part of the body frame 1. In this embodiment, the engine 11 is equipped with an electronically controlled fuel injection device. The electronically controlled fuel injection device forcibly injects fuel into the combustion cylinder using an actuator, and has the advantages of reducing the effects of external environments such as temperature, stabilizing the operation of the engine 11, and enabling detailed control.

[0023] A transmission case 2, which constitutes the vehicle frame 1 together with the engine frame 10, is connected integrally to the rear side of the engine frame 10. The engine 11 and the transmission case 2 are connected together via a belt transmission mechanism 12 so as to be capable of transmitting power.

[0024] The transmission case 2 is formed in a bifurcated shape, including a front case 2A extending downward and a rear case 2B extending diagonally downward and rearward.

[0025] Left and right traveling devices 13 are supported on the lower part of the front case 2A via axles 20. In this embodiment, the traveling devices 13 are wheels. The traveling devices 13 may be devices of other forms, such as crawler traveling devices.

[0026] A working device 14 is supported on the rear case 2B via a drive shaft 21. In this embodiment, the working device 14 is a rotary tilling device. The working device is equipped with a tilling rotor 4. The upper part of the tilling rotor 4 is covered by a rotary cover 5. A ridge-making mat 7 is provided behind the tilling rotor 4. The ridge-making mat 7 is made of a flexible rubber plate or the like.

[0027] A resistance rod 9 is provided at the rear of the working implement 14 to provide resistance to the movement of the machine body during work and to determine the working depth of the working implement 14. The resistance rod 9 is provided at a position overlapping with the rear of the tilling rotor 4 in a side view. The resistance rod 9 comes into contact with the field, thereby determining the height of the tilling rotor 4 relative to the field surface.

[0028] The power of the engine 11 is transmitted to a gear transmission mechanism (not shown) inside the transmission case 2 via a belt transmission mechanism 12. The belt transmission mechanism 12 is configured so that the power transmission can be turned on and off by a clutch operating arm 12a. The belt transmission mechanism 12 and the clutch operating arm 12a form a main clutch that connects and disconnects the power transmission to the traveling drive system and the work drive system. The power from the main clutch is branched off and transmitted to the work device 14 and the traveling device 13.

[0029] A main speed change lever 15 extends diagonally upward and rearward from the top of the transmission case 2. By operating this main speed change lever 15, the speed change operation and forward / reverse switching operation of the traveling device 13, as well as the forward / reverse rotation operation of the working device 14 can be performed.

[0030] A control handle 16 extends toward the rear of the aircraft from the rear of the transmission case 2. A switching lever 17 for turning, an engine stop switch 18, a throttle lever, etc. are disposed on the right side of the control handle 16. A main clutch lever 3 is disposed on the rear end side of the control handle 16.

[0031] In the walk-behind cultivator configured as above, an operator holds the control handle 16 and walks together with the walk-behind cultivator while operating the walk-behind cultivator.

[0032] [Support structure of resistance rod] The walk-behind type cultivator of this embodiment is provided with a support mechanism 30 that supports the resistance bar 9 so that the position of the resistance bar 9 can be changed in the vertical direction and the resistance bar 9 can be held in any vertical position.

[0033] The support mechanism 30 includes a holding member 31 that holds the resistance rod 9 so that it can move up and down, a plurality of locking grooves 32 formed at intervals in the vertical direction in the resistance rod 9, and a locking pin 33 provided on the holding member 31 that enters and locks into one of the multiple locking grooves 32 to regulate the vertical movement of the resistance rod 9.

[0034] 2 to 5, the resistance rod 9 has a flat rectangular cross-sectional shape and is formed into a strip shape extending vertically. The resistance rod 9 is supported by a holding member 31 so as to be movable in the vertical direction. The holding member 31 has an insertion portion that is rectangular in plan view so that the resistance rod 9 can slide vertically.

[0035] The retaining member 31 is fixed and supported integrally by a fixing plate 34 that is bolted to the transmission case 2. A locking pin 33 is inserted and supported in the upper part of the retaining member 31 so as to penetrate across both the left and right side parts. The locking pin 33 is fixed to the retaining member 31. The upper part of the retaining member 31 is in a state in which the rear side of the resistance rod 9 is open. The upper part of the retaining member 31 is formed with rear extension parts 35 that extend rearward on the left and right side parts. A front wall part 36 that restricts the forward movement of the resistance rod 9 is formed in a location in front of the resistance rod 9 in the upper part of the retaining member 31.

[0036] An upper restricting pin 37 is inserted and supported in a position on the rear extension portion 35 of the holding member 31 lower than the position where the locking pin 33 is attached, so as to penetrate across both the left and right side portions. The upper restricting pin 37 can restrict the resistance rod 9 from moving significantly rearward.

[0037] The resistance rod 9 has a plurality of locking grooves 32 formed at appropriate intervals in the vertical direction on the front side surface of the vertical middle part. A locking pin 33 is selectively inserted into one of the plurality of locking grooves 32 and locked, so that the vertical position of the resistance rod 9 can be changed to any position and fixed in place.

[0038] A support pin 38 is inserted and supported in a rear portion at a vertically intermediate position of the holding member 31 so as to extend across both the left and right side portions. A helical spring 39 is attached to the support pin 38 as a biasing mechanism. The lower end of the helical spring 39 is supported by the rotary cover 5. The upper end of the helical spring 39 is in contact with the resistance rod 9 and is configured to bias the resistance rod 9 to move forward.

[0039] A rear wall portion 40 that restricts the forward movement of the resistance rod 9 is formed at the rear of the lower portion of the holding member 31. A front extension portion 41 is formed at the lower portion of the holding member 31, with left and right side portions extending forward. A lower restriction pin 42 is inserted and supported in the front extension portion 41 so as to pass through both the left and right side portions. The lower restriction pin 42 can restrict the resistance rod 9 from moving forward too much.

[0040] The locking pin 33 enters and locks into one of the locking grooves 32, thereby fixing the vertical position of the resistance rod 9. The resistance rod 9 is then biased forward by the biasing force of the helical spring 39. The front side of the resistance rod 9 above the swing fulcrum (support pin 38) of the helical spring 39 is supported by the front wall 36 of the holding member 31, and the rear side of the resistance rod 9 below the swing fulcrum (support pin 38) of the helical spring 39 is supported by the rear wall 40 of the holding member 31, so that the resistance rod 9 is held in the reference position as shown by solid lines in Figs. 2 and 3.

[0041] 6, the locking groove 32 is formed in an inclined position that is positioned downward toward the back with respect to a direction perpendicular to the vertical movement direction of the resistance bar 9. A convex portion 43 that protrudes upward is formed on the inlet portion of the lower inner edge of the locking groove 32.

[0042] By configuring it in this manner, for example, even if the aircraft vibrates significantly or the aircraft is switched into reverse and a force is applied that moves the lower end of the resistance rod 9 forward, the locking pin 33 will not easily come out of the locking groove 32 and the locked state can be maintained.

[0043] In the holding member 31, a movement space Q is formed that allows the resistance rod 9 to move in the direction in which the locking pin 33 comes out of the locking groove 32. That is, as shown in Figures 4 and 5, when the resistance rod 9 is held in the reference position, a gap of a predetermined distance is formed between the resistance rod 9 and the upper regulating pin 37, and a gap of a predetermined distance is also formed between the resistance rod 9 and the lower regulating pin 42. The gaps formed between the resistance rod 9 and the upper regulating pin 37 and between the resistance rod 9 and the lower regulating pin 42 correspond to the movement space Q.

[0044] As a result, when the upper part of the resistance rod 9 is manually pulled backward against the biasing force of the helical spring 39, it is possible to tilt the resistance rod 9 in the front-rear direction through the movement space formed by the gap between the resistance rod 9 and the upper regulating pin 37 or the lower regulating pin 42, thereby releasing the engagement between the locking pin 33 and the locking groove 32. Then, with the engagement between the locking pin 33 and the locking groove 32 released in this way, the resistance rod 9 is slid up and down to lock the locking pin 33 in the other locking groove 32, thereby changing the resistance rod 9 to a desired vertical position.

[0045] [Another embodiment] (1) As shown in FIG. 7, a configuration may be adopted in which a recess 50 recessed downward is formed in the inner lower edge of the locking groove 32 at the rear portion.

[0046] (2) Instead of moving the resistance rod 9, the locking pin 33 may be moved back and forth to release the locking state between the locking pin 33 and the locking groove 32. In this case, the locking pin 33 may be biased to move in the direction into which it enters the locking groove 32.

[0047] (3) The locking groove 32 may be formed so as to extend straight along a direction perpendicular to the vertical movement direction of the resistance rod 9.

[0048] (4) The lower inner edge of the engagement groove 32 may extend in a straight line without any irregularities in parallel with the upper inner edge. [Industrial Applicability]

[0049] The present invention can be applied to walk-behind working machines, such as walk-behind cultivators. [Explanation of symbols]

[0050] 9 resistance rod 30 Support mechanism 31 Retaining member 32 Locking groove 33 Locking pin 39 Spiral spring (biasing mechanism) 43 Convex 50 Recess Q. Space for movement

Claims

1. A work device for performing ground work; A resistance rod that provides resistance to the movement of the machine during work; A support mechanism is provided to support the resistance rod so that the position of the resistance rod can be changed in the vertical direction and the resistance rod can be held in any vertical position. The support mechanism includes: A holding member that holds the resistance rod so that the resistance rod can move up and down; A plurality of engagement grooves formed at intervals in the vertical direction in the resistance bar; a locking pin provided on the retaining member, the locking pin entering and locking into one of the locking grooves to restrict the vertical movement of the resistance rod.

2. 2. The walk-behind work machine according to claim 1, wherein the engagement groove is formed in an inclined position that is positioned downward toward the back in a direction perpendicular to the vertical movement direction of the resistance bar.

3. 3. The walk-behind work machine according to claim 2, wherein a convex portion protruding upward is formed on an inlet side portion of a lower inner edge of the engagement groove.

4. 3. The walk-behind work machine according to claim 2, wherein a recess is formed in a lower inner edge of the engagement groove at a rear portion thereof, the recess being recessed downward.

5. 5. The walk-behind work machine according to claim 1, further comprising an urging mechanism that urges the resistance rod in a direction in which the locking pin fits into the locking groove.

6. 5. The walk-behind work machine according to claim 1, wherein the retaining member is formed with a movement space that allows the resistance bar to move in a direction in which the locking pin comes out of the locking groove.

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