lawnmower

Abstract

A lawnmower is equipped with a shear pin to prevent the blade from breaking when a load is applied, thereby damaging other parts. By storing a spare shear pin near the mulching cover attached to the upper front part of the blade, it can be quickly replaced if the shear pin breaks. However, because the spare shear pin is located at the front of the deck, and because the mulching cover is removed from the deck during mulching work, it is exposed to rain, dust, etc., and there is a risk of it rusting. Therefore, we provide a lawnmower that can protect the spare shear pin from rain, dust, etc. [Solution] In a grass cutter equipped with a mower unit on a traveling body 2 fitted with a driver's seat 5 in which an operator can sit, a shear pin stock section 30 is provided below the driver's seat 5 to store spare shear pins to be replaced when the shear pin breaks.

Description

[Technical Field]

[0001] The present invention relates to a grass cutter. [Background technology]

[0002] A shear pin is provided on a grass trimmer to prevent the blade from breaking when a load is applied, causing damage to other parts. By keeping a spare shear pin near the mulching cover located at the top front of the blade, it can be quickly replaced if the shear pin breaks (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-151837 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because it is installed at the front of the deck, and because the mulching cover is removed from the deck during mulching work, the spare shear pin is exposed to rain, dust, etc., and there is a risk that it will rust.

[0005] SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a brush cutter that can protect a spare shear pin from rain, dust, and the like. [Means for solving the problem]

[0006] The invention described in claim 1 is a brush cutter equipped with a mower unit 6 on a running body 2 fitted with a driver's seat 5 in which an operator can sit, and which has a shear pin stock section 30 provided below the driver's seat 5 for storing spare shear pins to be replaced when the shear pin breaks.

[0007] According to the invention described in claim 1, by providing a shear pin stock section 30 below the driver's seat 5 for storing spare shear pins that are only used when the shear pin breaks, the spare shear pins can be protected from rain, dust, etc.

[0008] The invention described in claim 2 is a brush cutter described in claim 1, which is provided with a pivot pin 27 for rotatably mounting the driver's seat 5 to a slide body 26 that moves back and forth along mounting stays 20, 20 attached to the vehicle body, and a shear pin stock portion 30 is provided on the slide body 26.

[0009] According to the invention described in claim 2, when the shear pin breaks and needs to be replaced with a spare one, the spare shear pin can be removed by rotating the driver's seat 5, and the shear pin stock section 30 moves back and forth along with the driver's seat 5, thereby providing appropriate protection from rain, dust, etc.

[0010] The invention described in claim 3 is a brush cutter described in claim 1 or claim 2, which is provided with cushion springs 42, 42 that support the load of the driver's seat 5 and a seating detection switch 40 that detects when an operator is seated in the driver's seat 5, and which is provided with a cover body 32 that covers a spare share pin in the share pin stock section 30, so that the cover body 32 supports the driver's seat 5 when the driver's seat 5 is lowered below a predetermined level.

[0011] According to the invention described in claim 3, a cover body 32 that covers a spare share pin is provided in the share pin stock section 30 below the driver's seat 5, and when the driver's seat 5 is lowered more than a predetermined level, the cover body 32 supports the driver's seat 5, thereby preventing a load from being applied beyond the detection range of the seating detection switch 40. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a riding lawnmower according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] A riding lawnmower 1, which is one embodiment of a lawnmower disclosed in the present application, will be described in detail with reference to the accompanying drawings.

[0014] The forward / rearward direction is the direction in which the riding lawnmower 1 travels when traveling straight, with the front side of the traveling direction defined as "front" and the rear side defined as "rear." The traveling direction of the riding lawnmower 1 is the direction from the driver's seat 5 (described later) toward the steering wheel 9 when traveling straight.

[0015] The left-right direction is a direction that is horizontally perpendicular to the front-to-rear direction. In other words, when an operator of riding lawnmower 1 is seated in driver's seat 5 and facing forward, the left-hand side is the "left" side and the right-hand side is the "right" side.

[0016] The up-down direction is a direction parallel to the vertical direction. The front-rear direction, left-right direction, and up-down direction are perpendicular to one another. Note that each direction is defined for the convenience of explanation, and the present invention is not limited to these directions. In the following, the riding lawnmower 1 may also be referred to as the "machine body."

[0017] Furthermore, the present invention is not limited to the following embodiments.

[0018] <Overall structure> As shown in Figure 1, left and right front wheels 3F, 3F and left and right rear wheels 3R, 3R are provided at the bottom of the running body 2 of the riding lawnmower 1, a grass collection container 4 is attached to the rear, and a driver's seat 5 is provided at the upper rear.

[0019] A mower unit 6 is mounted below the center of the traveling vehicle body 2, and a conveying path is provided between the grass collection container 4 and the mower unit 6 to convey the grass clippings cut by the mower unit 6 to the grass collection container 4.

[0020] A bonnet 7 covering the engine E and a steering post 8 are located in front of the driver's seat 5, with a steering handle 9 attached to the top of the steering post 8, a step floor 10 attached to the body frame is located in front of and below the driver's seat 5, and a fender 11 attached to the body frame is located below the driver's seat 5.

[0021] A hand grip 11a is provided on the upper surface of the fender 11 on the left side of the driver's seat 5, and the worker can easily get on and off the traveling vehicle body 2 by holding the hand grip 11a, and can also hold the hand grip 11a while sitting in the driver's seat 5 and working on a slope, making it easy to work on a slope.

[0022] The mower unit 6 includes a mower deck 12, left and right front support wheels 13, 13, left and right rear support wheels 14, 14, and left and right lifting links 15, 15 at the front and rear.

[0023] The mower deck 12 is a box-shaped structure with an open bottom, and houses left and right rotating blades for mowing the grass inside. The power unit of the mower unit 6 and left and right lifting links 15, 15 are arranged on the upper side of the top surface, exposed to the outside.

[0024] The power section of the mower unit 6 receives the rotational driving force of the engine E from the traveling body 2 via the mower input shaft, and the power is transmitted from the output shaft of the power section to the drive shafts of the left and right rotating blades, causing the left and right rotating blades to rotate and mow the grass.

[0025] The tip of the output shaft of the power section of the mower unit 6 is fitted to the base of the drive shaft of the left and right rotary blades, and a shear pin is inserted through both, so that the drive shaft of the left and right rotary blades is driven to rotate.

[0026] Therefore, if an overload is applied to the left and right rotary blades during lawn mowing, the shear pin will break, cutting off power transmission and preventing damage to the power unit.

[0027] If the shear pin breaks, the engine E is stopped and the pin is replaced with a spare one, which will be described later, and work continues.

[0028] The left and right lifting links 15, 15 have their base ends connected to the traveling body 2, and lifting cylinders raise and lower the mower unit 6 while keeping it horizontal. The mower unit 6 is raised when not working, such as when traveling on a road, and lowered when mowing.

[0029] <Driver's seat 5 installation configuration and spare shear pin storage configuration> As shown in FIGS. 2 to 5, the driver's seat 5 is attached to the upper surface of a fender 11 attached to the body frame.

[0030] That is, on the upper surface of the fender 11, left and right independent mounting stays 20, 20 are fixed to the vehicle body frame with bolts 21, sandwiching the fender 11 therebetween, at a predetermined interval.

[0031] The left and right mounting stays 20, 20 are provided with long elongated holes in the front and rear directions for inserting bolts 21, and the left and right mounting stays 20, 20 can be adjusted in the front and rear positions by the length of the elongated holes, and the left and right mounting stays 20, 20 can be fixed in appropriate positions that allow smooth adjustment of the front and rear position of the driver's seat 5, which will be described later.

[0032] Left and right slide rails 20a, 20a provided on the upper portions of the left and right mounting stays 20, 20 are provided with left and right slide members 22, 22 that are slidable in the front-rear direction.

[0033] The left and right ends of a front connecting stay 23 are fixed to the front parts of the left and right slide members 22, 22 with bolts 24, and the left and right ends of a rear connecting stay 25 are fixed to the rear parts of the left and right slide members 22, 22 with bolts 24.

[0034] Therefore, the left and right slide members 22, 22, the front connecting stay 23 and the rear connecting stay 25 constitute a slide frame 26 as a slide body that slides back and forth on the left and right slide rails 20a, 20a on the upper parts of the left and right mounting stays 20, 20.

[0035] The front connecting stay 23 is provided with left and right support pieces 23a, 23a that are formed by bending them upward, and a rotation fulcrum pin 27 that supports the front part of the driver's seat 5 so that it can rotate freely is inserted into through holes 23b, 23b provided in the left and right support pieces 23a, 23a.

[0036] As shown in FIGS. 3 to 5, the front connecting stay 23 is provided with a shear pin stock portion 30 for storing spare shear pins.

[0037] The shear pin stock section 30 is composed of a disk 31 having six holding holes 31a for inserting and holding spare shear pins in a pin body whose base is fixed to the upper surface of the front connecting stay 23, and a detachable cover body 32 that covers the disk 31 from above to prevent the intrusion of dust and water and to prevent the spare shear pins from rusting.

[0038] The cover body 32 has its lower end in contact with the upper surface of the front connecting stay 23 in a state in which it covers from above the disk 31 which is held by shear pins inserted into the six holding holes 31a.

[0039] As described below, when an operator sits in the driver's seat 5 in a seatable state, the upper surface of the cover body 32 comes into contact with the center of the bottom surface of the driver's seat 5, and also functions as a support member that supports the driver's seat 5.

[0040] Further, a microswitch 40 serving as a seating detection switch for detecting when an operator is seated in the driver's seat 5 is provided on the underside of the front connecting stay 23, and its detection arm 40a extends rearward from the front connecting stay 23.

[0041] The rear connecting stay 25 is provided with a spring 41 at the center of the left and right sides for pushing up the rear bottom surface of the driver's seat 5 when the driver's seat 5 is in a seatable state, and left and right receiving surfaces 43, 43 are provided on both the left and right sides of the spring 41 for receiving the tips of left and right cushion springs 42, 42 provided on the rear bottom surface of the driver's seat 5 when the driver's seat 5 is in a seatable state.

[0042] Therefore, the front of the driver's seat 5 is supported so as to be freely rotatable, with the pivot pin 27 inserted through the through holes 5b, 5b of the left and right mounting brackets 5a, 5a provided on the front bottom surface of the seat and through holes 23b, 23b provided in the left and right support pieces 23a, 23a of the front connecting stay 23, and the tips of the left and right cushion springs 42, 42 provided on the rear bottom surface of the seat 5 come into contact with the left and right receiving surfaces 43, 43 of the rear connecting stay 25, making the seat available for the driver.

[0043] The driver's seat 5 can be rotated around a rotation fulcrum pin 27 to be in a seatable state, or tilted forward to be in a stowed state.

[0044] An operating piece 45 is provided at the center of the bottom surface of the driver's seat 5 to push and operate a detection arm 40a of a microswitch 40 that detects when an operator sits on the driver's seat 5 in a seatable state.

[0045] When no operator is seated in the operator's seat 5, the lower end of the operating piece 45 is separated upward from the detection arm 40a of the microswitch 40 and is not pressed down because the operator's seat 5 is in a seatable state and the rear bottom surface thereof is pushed upward by the spring 41 of the rear connecting stay 25.

[0046] When an operator sits in the driver's seat 5, the operator's weight compresses the left and right cushion springs 42, 42 and the spring 41, causing the driver's seat 5 to rotate downward around the front pivot pin 27, and the lower end of the operating piece 45 presses and operates the detection arm 40a of the microswitch 40, causing the microswitch 40 to detect that the operator is seated.

[0047] The operating piece 45 can be extended and retracted to adjust its length using a screw with a rubber tip. The position at which the detection arm 40a of the microswitch 40 is pressed changes depending on the worker's weight and working posture, so the length of the operating piece 45 can be adjusted to suit the worker and the situation.

[0048] When the operator leaves the driver's seat 5, the spring 41 in the center of the rear connecting stay 25 pushes up the driver's seat 5, causing the lower ends of the left and right cushion springs 42, 42 to float above the left and right receiving surfaces 43, 43 of the rear connecting stay 25, and the lower end of the operating piece 45 moves appropriately upward away from the detection arm 40a of the microswitch 40, so that the microswitch 40 properly detects that the operator has left the seat and the control device can properly stop the engine E based on this detection.

[0049] In addition, the right slide member 22 of the slide frame 26 is provided with a front-rear position adjustment lever 50 that adjusts the front-rear position of the driver's seat 5 by moving the slide frame 26, to which the driver's seat 5 is attached, back and forth along the left and right slide rails 20a, 20a on the upper part of the left and right mounting stays 20, 20.

[0050] The front-rear position adjustment lever 50 has a lever rod 50a rotatably provided on the upper surface of the right slide member 22, and an operating portion 50b provided at the front end of the lever rod 50a.

[0051] The lever rod 50a is provided with a downwardly extending locking piece, which is biased in a downward rotation direction by a coil spring so that the locking piece engages with one of multiple engagement recesses provided consecutively in the front-to-rear direction on the right slide rail 20a.

[0052] Therefore, when an operator seated in the driver's seat 5 rotates the operating part 50b of the fore-aft position adjustment lever 50 upward against the biasing force of the coil spring, the locking piece extending downward from the lever rod 50a disengages from the engaging recess. When the operator slides the driver's seat 5 to the desired fore-aft position and releases the operating part 50b, the lever rod 50a rotates due to the biasing force of the coil spring, and the locking piece engages with the engaging recess, making it possible to easily fix the driver's seat 5 in the desired position.

[0053] In summary, the left and right mounting stays 20, 20 that are fixed to the upper surface of the fender 11 are made up of independent left and right units, and the slide frame 26 that slides back and forth on the left and right slide rails 20a, 20a on the top of the left and right mounting stays 20, 20 is made up of a combination of independent units, the left and right slide members 22, 22, the front connecting stay 23, and the rear connecting stay 25, making it possible to design a lightweight and inexpensive structure that fulfills each role.

[0054] In other words, the front connecting stay 23 of the slide frame 26 not only serves as a rigid member connecting the left and right slide members 22, 22, but also has the function of attaching the front part of the driver's seat 5 by providing a pivot fulcrum pin 27 on the left and right support pieces 23a, 23a formed integrally therewith.

[0055] Furthermore, by providing a microswitch 40 having a detection arm 40a on the front connecting stay 23, when the driver's seat 5 is adjusted forward or backward, the microswitch 40 provided on the front connecting stay 23 also moves forward or backward following the driver's seat 5, so that the microswitch 40 can properly detect whether the operator is seated regardless of the forward or backward adjustment of the driver's seat 5.

[0056] Furthermore, by providing the front connecting stay 23 with a shear pin stock section 30 for storing spare shear pins, the shear pin stock section 30 is positioned in a hidden position below the driver's seat 5 when the driver is seated, and when the driver's seat 5 is adjusted forward or backward, the shear pin stock section 30 provided on the front connecting stay 23 also moves forward or backward along with the driver's seat 5. Therefore, regardless of whether the driver's seat 5 is adjusted forward or backward, the shear pin stock section 30 is positioned below the driver's seat 5, making it inconspicuous from the outside and able to properly protect the spare shear pins from rain, dust, etc.

[0057] When the shear pin breaks and needs to be repaired, the driver's seat 5 can be rotated forward to open the cover body 32 of the shear pin stock section 30, and a spare shear pin can be easily taken out.

[0058] Furthermore, when an operator sits in the driver's seat 5 with its upper surface set in a seatable state, the upper part of the cover body 32 of the share pin stock section 30 functions as a support member that supports the seat when the driver's seat 5 is lowered more than a predetermined level, thereby preventing a load from being applied to the detection arm 40a of the microswitch 40 beyond the detection range.

[0059] In addition, the rear connecting stay 25 of the slide frame 26 serves as a rigid member connecting the left and right slide members 22, 22, and also serves as a mounting seat for left and right receiving surfaces 43, 43 that receive the tips of the left and right cushion springs 42, 42 provided on the rear bottom surface of the driver's seat 5, and for a spring 41 that pushes the rear bottom surface of the driver's seat 5 upward. [Explanation of symbols]

[0060] 2 Running vehicle 5 Driver's seat 6 Mohr Unit 20 Mounting stays (left and right mounting stays) 26 Slide body (slide frame) 27 Pivot pin 30 Shear pin stock section 32 Cover body 40 Seat detection switch (microswitch) 42 Cushion spring

Claims

1. This mower is equipped with a mower unit (6) on a traveling vehicle body (2) fitted with a driver's seat (5) on which an operator can ride, and is characterized in that a shear pin stock section (30) for storing spare shear pins to be replaced when the shear pin breaks is provided below the driver's seat (5).

2. 2. The brush cutter according to claim 1, further comprising a pivot pin (27) for pivotally mounting the driver's seat (5) to a slide body (26) that moves back and forth along mounting stays (20, 20) attached to the vehicle body, and a shear pin stock portion (30) provided on the slide body (26).

3. 3. A brush cutter according to claim 1 or claim 2, characterized in that it is provided with cushion springs (42, 42) that receive the load of the driver's seat (5), a seating detection switch (40) that detects when an operator is seated in the driver's seat (5), and a cover body (32) that covers a spare shear pin in the shear pin stock section (30), so that the cover body (32) supports the driver's seat (5) when the driver's seat (5) is lowered to a predetermined position or more.

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