JP4691724B2 - Agricultural work cart and farm work chair - Google Patents

Description

  The present invention relates to a farm cart and a farm chair used for farm work.

2. Description of the Related Art Conventionally, various work chairs used together with a carriage have been proposed, such as a chair that is supported so that the seat is rotatable and a chair that is supported so that the height of the seat can be adjusted. Agricultural work is a heavy physical burden on the knees, legs, and waist. Therefore, in order to reduce the physical burden due to farm work, farm work is being carried out while sitting on a work chair. On the other hand, some agricultural trucks are equipped with four wheels so that they can handle various farming operations, and are capable of traveling on, for example, a narrow fence. Many of the chairs provided in such work carts are used by setting the chair posture in advance so that a work posture can be easily taken for a certain work content (for example, Patent Documents). 1, 2).
JP-A-7-1704 Utility Model Registration No. 3002157

  However, even if the work cart described in Patent Document 1 is used and farm work is performed with the chair posture set in advance, there is a problem that physical fatigue such as knees, legs, and hips increases. That is, when the work cart described in Patent Document 1 is used, it is possible to take a posture that facilitates work with respect to a certain work content, but it is common to perform agricultural work in various work postures. In other words, it is not always possible to take a work posture that facilitates work with respect to other work contents. For this reason, even if the farm work is performed by sitting on a chair in which the posture of the chair is set in advance, a physical burden is applied to the knees, legs, waist, and the like.

  Originally, humans cannot withstand the same working posture for a long time due to the structure of their bodies. For this reason, it is impossible to sit on a chair in which the posture of the chair is set in advance and perform farming work efficiently. For example, in chrysanthemum picking work, the work carriage is moved to a certain place, and in that place, the body is twisted, arms are stretched, crouched, and the heading work is performed in a forward bending posture. For this reason, even if farm work such as heading work is continued intermittently while taking an appropriate rest period, if a chair with a fixed chair posture is used in advance, the calf, knees, waist, etc. The physical burden increases, and the movement to get up from the squatting posture becomes tight.

Also, in farm work, farm work is often performed while moving a work cart in a place such as a narrow fence with a limited passage. For this reason, it is necessary to make it the trolley | bogie structure which can respond to the space where the channel | path was restricted. However, there is no trolley with such a structure that can reduce physical fatigue caused by farm work.
An object of the present invention is to provide a farm work chair and a farm work cart that have a structure that can solve the problems of the prior art, can be applied to farm work, and can significantly reduce the physical burden of farm work. Objective.

The present invention is agricultural chair structure which can change the chair position, and the problems by the agricultural working carriage equipped it resolved.
The present invention is as follows.
1. A chair provided on a farm cart, wherein two legs are divided into an upper leg and a lower leg, the upper leg is integrated with the seat, and the coil is mounted between the upper and lower legs. The length of the leg is made variable by a spring, the two legs are arranged in the front-rear direction along the carriage moving direction, and the lower legs of the two legs rotate around the pin via the posture stabilizing member. When the chair is not used, the posture stabilizing member is floated from the ground when the chair is not used, and when the chair is used, the posture stabilizing member is in contact with the ground. In addition, by taking a work posture that matches the work content, the height of the seat part can be changed within a predetermined range, and the inclination of the seat part can be changed to the front and rear and to the left and right. chair for farm work that was provided in the farm work for the truck to

2. The attachment mechanism of the posture stabilizing member to the cart frame provides a connecting member having one end fixed to the posture stabilizing member and the other end extending to the lower portion of the cart frame, and an urging force for floating the chair body through the connecting member. For this purpose, coil springs are disposed at two different locations on the bottom of the carriage frame. An agricultural work chair provided in the agricultural work carriage described in 1.
3. The posture stabilizing member is a pair of L-shaped members, and the connecting member fixed to the pair of L-shaped members is two flat members. Or 2. An agricultural work chair provided in the agricultural work carriage described in 1.

4). Structure for the pre Kiashi director is variable, a slit having a vertical length corresponding to a partial coil spring is contracted, the inner tube is formed at a position facing each other across the center of the tube, inner diameter than the inner cylinder A coupling pin formed on the outer cylinder by mounting the inner cylinder on the outer cylinder into which the coil spring is inserted. Any one of the above 1 to 3 , wherein the connecting pin is inserted in a state in which the position of the hole and the position of the slit formed in the inner cylinder are aligned, and the inner cylinder and the outer cylinder are connected by the connecting pin. An agricultural work chair provided in the agricultural work carriage according to claim 1 .

5 . Above 1. ~ 4 . Agricultural working carriage characterized by comprising the agricultural chair according to any one of.

According to the agricultural work chair according to the present invention, it is possible to change the posture of the chair by taking a working posture so that the worker can easily work according to the work content while sitting on the seat. The physical burden due to farming can be significantly reduced.
According to the agricultural cart according to the present invention, the tray base is swung while the tray is placed on the swiveling tray base so that the operator can easily perform the work according to the work contents while sitting on the seat. Thus, the tray can be moved to a position where the work can be easily performed, so that the physical burden due to the farm work can be remarkably reduced.

An embodiment in which the present invention is applied to farm work will be described with reference to FIGS.
FIG. 1A and FIG. 1B are a schematic side view and a schematic front view of a farm cart according to an embodiment. The agricultural cart according to the embodiment uses the limited space to the maximum, so that the chair 1 and the cart supported by the cart frame 2 are schematically shown in FIGS. 1 (a) and 1 (b). A swiveling tray base 4 is mounted on the frame 2. This agricultural work cart (also simply referred to as a cart) has a moving mechanism that moves forward and backward in the cart moving direction 10 by four wheels having tires 6 during operation.

  In this case, the moving mechanism for moving the carriage forward and backward transmits the rotation of the drive gear motor 7 to the sprocket 8A (the number of teeth T = 17), and transmits it to the sprocket 8C (the number of teeth T = 26) via the chain belt 8B. It is a mechanism that drives two drive wheels by transmitting rotation. The two wheels having the remaining tire 6 are driven wheels. The control box 9 </ b> A provided in the cart can receive a signal transmitted from the remote control transmitter by the remote control receiving antenna 9 </ b> B and can control the movement of the cart via the drive gear motor 7. In the case of a working carriage having such a drive wheel, the carriage can be moved forward and backward in the carriage movement direction 10 without manually pushing or pulling the carriage. It is preferable because a physical burden can be reduced.

  The agricultural truck according to the embodiment has a free wheel 6A arranged at the lower part of the truck frame 2 and when the lever is operated to move to the use position, the truck is manually moved in a direction different from the carriage moving direction 10. It can be moved. In FIG. 1 (a), the carriage movement to the right is forward, and the carriage movement to the left is backward. 1A and 1B, reference numeral 2A denotes a backrest provided on the carriage frame 2.

The agricultural truck according to this embodiment, for example, picks the ears extending from the chrysanthemum parent that has reached a height of about 20 to 30 centimeters from the ground in the heading operation described below, and turns it into a swiveling tray base 4. The structure is suitable for the operation of storing in the placed tray 5.
Here, the chair 1 (also referred to as an agricultural work chair) provided in the working cart according to the embodiment is arranged with two legs aligned in the front-rear direction in the cart moving direction 10. As shown in FIGS. 1 to 3, the chair 1 has two legs divided into upper and lower legs 1 </ b> B and 1 </ b> C. The upper leg 1 </ b> B is integrated with the seat 1 </ b> A, and the upper and lower legs A coil spring 14 is mounted between 1B and 1C (see FIG. 4). When the chair is not used, as shown in FIG. 2, the chair body is lifted from the ground 11 by the attachment mechanism to the carriage frame 2. That is, when the carriage is moved from one work place to the next work place, the posture stabilizing member 13 that connects the lower leg portions 1C of the two leg portions to each other by the connecting pins 16 is lifted from the ground 11 It becomes. 1 and 2, δ indicates the amount of floating from the ground 11 when the operator is not sitting on the seat 1A.

In this case, as shown in FIG. 2, the mechanism for attaching the chair body to the carriage frame 2 includes a connecting member 3 having one end fixed to the posture stabilizing member 13 and the other end extending to the lower portion of the carriage frame 2, and the connecting member 3. Coil springs 3A and 3B disposed at two different locations on the bottom of the carriage frame 2 in order to apply an urging force that causes the chair 1 body to float.
One coil spring 3A is disposed above the connection member 3 at a position away from the chair side of the bogie frame 2, and the other coil spring 3B is below the connection member 3 at a position near the chair side of the bogie frame 2. Has been placed. The connecting member 3 can be fixed to the lower portion of the posture stabilizing member 13 by, for example, rivet connection (see FIGS. 2 to 4). In FIG. 4, 13A indicates a rivet hole. The posture stabilizing member 13 is preferably a pair of L-shaped members, and the connecting member 3 fixed to the posture stabilizing member 13 is preferably a flat member. The effects of using the chair 1 provided in the working carriage according to this embodiment will be described later.

Next, the structure of the chair 1 provided in the work carriage will be described with reference to FIGS.
FIGS. 3A and 3B are a schematic side view and a schematic front view of the chair 1, and FIG. 4 is a partial vertical cross-sectional view showing an intra-leg structure of the chair 1. 3A, a indicates the distance between the connecting pins 16 that connect the lower leg 1C to the posture stabilizing member 13, and b in FIG. 4 indicates the vertical length of the slit formed in the lower leg 1C. .

  In the chair 1 provided in this working carriage, the lower leg portions 1C of the two leg portions are connected to each other by a connecting pin 16 through a posture stabilizing member 13 so as to be rotatable around the pin. The connecting pin 16 is inserted into a pin hole formed in the lower leg portion 1C and the posture stabilizing member 13 and is prevented from being detached by a retaining element 16A. As shown in FIG. 4, the leg length of the two legs of the chair 1 is variable by a coil spring mounted between the upper and lower legs.

  The structure in which the leg portion length is variable is such that the coil spring 14 sandwiched between the upper and lower leg portions 1B and 1C and a slit having a vertical length b corresponding to the amount of contraction of the coil spring 14 are sandwiched between the centers of the cylinders. And an outer cylinder having an inner diameter larger than that of the inner cylinder and an insertion hole for the connecting pin 15 formed at an opposed position across the center of the cylinder (see FIG. 4). . Then, the inner cylinder is mounted on the outer cylinder into which the coil spring 14 has been inserted, and the connecting pin 15 is inserted in a state where the position of the pin hole of the connecting pin 15 and the position of the slit are aligned. It is the structure which connected the outer cylinder. The connecting pin 15 that connects the inner cylinder and the outer cylinder is retained by a retaining element 15A. Further, the coil springs 14 respectively mounted on the two legs are set to have a resilient force that shrinks as much as the same force. The chair 1 having such a structure is preferable because a leg length variable structure suitable for farm work can be obtained with a simple structure.

In the case of the chair 1 having such a leg length variable structure, when the chair is used, a worker who performs farm work sits on the seat 1A and takes a working posture in which an equal force is applied to the two legs. When taken, the coil springs 14 respectively attached to the two legs are contracted by the same amount, and the seating surface 12 is in a horizontal state substantially parallel to the ground surface 11.
The effect of the chair 1 provided in the work cart described above will be described.

FIG. 5 illustrates that when the chair is used, the posture of the chair 1 can be changed by taking a working posture so that the worker can easily perform farming in accordance with the work content while sitting on the seat 1A. FIG. 5A is a side view, and FIG. 5B is a front view.
In the chair 1 described above, the coil springs 14 are attached to the two legs, and the lower legs 1C of the two legs are connected to each other by the connecting pins 16 so as to be rotatable around the pins via the posture stabilizing member 13. The posture stabilizing member 13 is connected to the carriage frame 2 by an attachment mechanism. For this reason, the force applied to the two legs arranged in the front-rear direction along the carriage moving direction 10 by taking a working posture according to the work contents while the operator sits on the seat 1A. Is changed, the contraction amounts of the coil springs 14 respectively attached to the two leg portions are different. As a result, as shown in FIG. 5A, the state of the chair 1 can be changed from a horizontal state in which the seat surface 12 is substantially parallel to the ground 11 to a state in which the seat surface 12 is tilted back and forth with respect to the carriage movement direction 10.

  FIG. 5A shows the tilt directions 17 and 18 of the cylinder center 1D of the upper and lower legs when the state of the chair 1 is changed so that the seat surface 12 tilts forward (on the side opposite to the carriage). . Here, it is important to regulate the inclination of the seat surface 12 so as not to be excessive. For this purpose, the distance a between the connecting pins 16 that connect the lower leg 1C to the posture stabilizing member 13 and the vertical length b of the slit formed in the lower leg 1C are made appropriate, and the front and rear of the cylinder center 1D of the upper and lower legs The inclination in the direction is preferably 45 ° or less depending on the farm work.

  Further, by taking a work posture in which the worker can sit down on the seat portion 1A and easily work according to the work content, the seat surface 12 is substantially parallel to the ground surface 11 as shown in FIG. The posture of the chair 1 can also be changed from a horizontal state to a state inclined to the left and right with respect to the carriage moving direction 10. In FIG. 5 (b), 19 indicates the inclination direction of the cylinder center 1D of the upper and lower legs when the state of the chair 1 is changed so that the seat surface 12 is inclined leftward when viewed from the front. However, when the seat surface 12 is excessively inclined to the left and right with respect to the carriage moving direction 10, it is difficult for the worker to perform farming work in a stable working posture. Therefore, the chair 1 provided in the work cart regulates the inclination of the cylinder center 1D of the upper and lower leg portions in the left-right direction to a predetermined range by the posture stabilizing member 13 and the mechanism for attaching the chair 1 body to the work cart. Yes. The tilt angle when tilting the cylinder center 1D from the vertical line 11A to the left and right is preferably 0 to 30 ° depending on the farm work.

  As described above, by using the chair 1 provided in the work carriage, the swivel tray base 4 is moved to a position where the work can be easily performed, and the work can be performed in accordance with the work contents while the operator sits on the chair. Since the posture of the chair 1 can be changed by taking a working posture so that it is easy to do, the physical burden due to farming on the calf, knees, waist, etc. can be significantly reduced. In addition, when performing an action of standing up from a squatting posture, the posture of the posture stabilizing member 13 to the cart frame 2 and the elasticity of the coil springs 14 respectively attached to the two legs are assisted by the knee, waist and hips. Can reduce the physical burden on the body. As a result, when the work chair 1 is used, agricultural work can be performed efficiently.

  For example, when the above-described work cart is used and a chrysanthemum picking operation is performed as an agricultural work, the cart is moved intermittently from one end of the rod to the other end. At that time, while the carriage was stopped, the worker sat on the chair 1 and the ears extended from the chrysanthemum parent plant that reached 20-30 cm in height from the place of chrysanthemum planted on the left and right with the bushes in between. Is manually picked and placed in a tray placed on a carriage. On the other hand, if there is no ear to be picked from the reach of the human hand while sitting on the chair 1 in a certain cage where the carriage is stopped, the next place to perform the subsequent head picking work Move the carriage slightly. When moving the carriage in the cage, the operator lifts his / her waist and moves the carriage straight with the chair 1 floating from the ground 11.

Here, the attachment mechanism of the chair body to the bogie frame 2 is such that one end side is fixed to the posture stabilizing member 13 and the other end side extends to the lower portion of the bogie frame 2 and the chair 1 body is lifted via the connection member 3. In order to apply the urging force to be applied, a mechanism including coil springs 3A and 3B arranged at two different locations on the bottom of the carriage frame 2 is preferable.
The reason for this is that the chair 1 itself can be lifted from the ground when the chair is not used by simply adjusting the rigidity of the connecting member 3 and the elastic force of the coil springs 3A and 3B. This is because the posture stabilizing member 13 can be in contact with the ground surface 11 when the operator sits down on the seat 1A during use. Also, the reason is that by adjusting the rigidity of the connecting member 3 and the resilient force of the coil springs 3A, 3B, the operator is bounced up when performing an operation of rising from a squatting posture. What can be prevented can be mentioned.

  Further, it is preferable that the posture stabilizing member 13 is a pair of L-shaped members, and the connecting member 3 fixed to the pair of L-shaped members is two flat members. This is because the adjustment of changing the amount of protrusion of the surface of the pair of L-shaped members facing the ground 11 in the direction perpendicular to the carriage moving direction 10 and the adjustment of changing the bending rigidity of the two flat members, This is because the inclination of the seating surface 12 to the left and right with respect to the carriage moving direction 10 can be regulated within a predetermined range. In that case, if the posture stabilizing member 13 is a pair of L-shaped steel members and the flat member fixed to the pair of L-shaped members is a flat steel material, the seat surface 12 can be inclined to the left and right with respect to the carriage moving direction 10. It is more preferable because an appropriate material that can be regulated within a predetermined range can be easily selected.

Next, a preferred tray-type tray 4 provided on the carriage frame 2 will be described with reference to FIGS. 6 (a) and 6 (b) are schematic plan views showing the degree of freedom of the swiveling tray base 4 provided in the working carriage according to the embodiment, and FIG. 7 is a diagram for working according to the embodiment. It is an exploded view which shows the structure of the turning type tray stand 4 with which the cart was equipped.
As shown in FIG. 7, mounting means such as mounting screws 19, 20, 21, washers 22, and nuts 23 are used for the swing type tray base 4. As shown in FIG. 6, the tray base 4 includes a rectangular frame 4 </ b> A that can smoothly slide the tray in the longitudinal direction thereof, and an octagonal receiving plate 4 </ b> C that is disposed with the central portion positioned on the carriage frame. And a rectangular arm plate 4B whose other end is received by the receiving plate 4C and one end is connected to the frame 4A, and is attached by attachment means as shown in FIG. At that time, the longitudinal base portion of the frame body 4A overlaps with one end portion of the arm plate 4B via the base 4D and is rotatably attached around the arm plate 4B, and the other end portion of the arm plate 4B is the center of the receiving plate 4C. Is mounted on the carriage frame 2 with a receiving plate 4C interposed therebetween so as to be rotatable 360 °. The receiving plate 4C supports the arm plate 4B and the frame 4A. The shape of the receiving plate 4C can be a polygon or a circle. According to the work cart provided with the swivel-type tray base 4 having such a structure, the tray is mounted on the frame 4A so that the operator can easily perform the work in accordance with the work contents while sitting on the seat. As shown in FIGS. 6 (a) and 6 (b), the tray base is smoothly swung while being placed, and the arm plate 4B and the frame body 4A are bent in the longitudinal direction when viewed in plan, thereby facilitating the work. The tray can be pushed out to the position. Therefore, the physical burden due to farming can be significantly reduced.

  For example, when performing a work such as chrysanthemum picking work using a work cart equipped with such a swiveling tray base 4, the tray base is smoothly swung while the tray is placed on the frame 4A. Thus, the longitudinal direction of the rectangular frame 4A can be made to coincide with the cart movement direction 10, and the tray can be pushed out to the left and right with respect to the cart movement direction 10 (see FIGS. 6A and 6B). It should be noted that the overlapping amount of the octagonal receiving plate 4C and the arm plate 4B is not limited even when the tray is placed on the front end in the longitudinal direction of the rectangular frame 4A and the tray is stored with a predetermined weight. The contact area is secured so that the rectangular arm plate 4B can be smoothly rotated 360 ° around the center of the receiving plate 4C within the surface of the receiving plate 4C.

  Further, in addition to the four wheels having the tire 6, a universal wheel 6 </ b> A for moving the carriage in a direction different from the carriage moving direction 10 is provided at the lower part of the carriage frame 2 in place of the front wheel or the rear wheel having the tire 6. For the work that is provided in a state that it is rotatably supported by two supports on the left and right sides of the wheel, and can be switched between a use position that moves using the free wheel 6A and a non-use position that houses the free wheel 6A by lever operation. A cart is preferred.

  For example, as shown in FIG. 8, a lever 24 is provided at one end, and a wire 27 is connected to the other end of a lever arm 26 that rotates around a fulcrum 25 by lever operation. The wire 27 passes through a conduit 28 fixed to the carriage frame 2 and is connected to a support that rotatably supports the shaft of the free wheel 6A. Reference numeral 29 denotes a support center that rotatably supports the shaft of the free wheel 6A. Reference numeral 30 denotes a switching direction in which the lever 24 fixed to the carriage frame 2 is freely pulled down to change the unused position where the free wheel 6A is stored from the unused position.

  According to the working cart provided with such a free wheel 6A at the left and right two positions below the cart frame 2, the swivel wheel 6A is moved to the use position by a simple lever operation, and then is located above the backrest 2A provided on the cart frame 2. Since it is possible to move the cart in the lateral direction perpendicular to the cart movement direction 10 without manually grasping the position (see Fig. 1) and lifting the entire cart manually, the physical burden associated with farming work can be reduced. desirable. In order to pull back the free wheel 6A in the direction opposite to the switching direction 30, an appropriate spring is attached to the support 6B that supports the shaft of the free wheel 6A, and the other is attached to 9C. It is suitable for agricultural carts.

  When the above-described chair 1 is provided on the cart having a structure capable of reducing the physical burden associated with the farm work, the physical effect of the farm work is more than the case where only the chair 1 is provided due to the synergistic effect of both. This is preferable because it is possible to reduce a burden.

Picking chrysanthemums by using the farm cart shown in Fig. 1 and using conventional farm carts without using the farm cart and burdening the body (work posture, heart rate, surface myoelectric potential) ), Fatigue symptoms and working hours were compared.
The dimensions of the agricultural truck (including the chair 1 and the swivel tray 4 stored on the truck) were as follows.

Wheel interval (distance between front and rear wheel shafts having tire 6): 480 mm
Diameter of tire 6: 260 mm
Total length: 1140mm
Overall width: 400mm (size up to the outer width of 4 wheels with tire 6)
Overall height: 790mm
Chair height: 400mm (when not in use)
Floating amount from the ground when the chair is not used δ: (60) mm
The height of the swivel-type tray base 4: 450 mm
Spacing a between connecting pins 16 connecting the lower leg portion to the posture stabilizing member a: (130) mm
Vertical length b of the slit formed in the lower leg part: (90) mm
In the chrysanthemum picking work using a farm cart, the tray is placed on the arm base and the person under test (equivalent to the worker) sits down on the seat and is about 20-30 cm above the ground. Pick up the ears of chrysanthemums that have reached the meter and store them in tray 5. However, as the swivel-type tray base 4 provided in the agricultural cart, the tray 5 is placed at the front end in the longitudinal direction of the rectangular frame 4A and the arm plate 4B and the frame 4A are bent. When the position in the left-right direction is measured in the left-right direction from the center of the two legs, the distance is set to 450 mm. On the other hand, in the practice of picking chrysanthemums according to conventional practice, the chrysanthemum ears that have reached a height of approximately 20-30 cm from the ground are picked up in a squatting posture, and the ears are stored in a foam tray placed on the ground. To do.

The head picking work was performed in a work pattern as shown in FIG. 9, and the same worker performed the head picking work for 25 minutes twice with a rest for 10 minutes. During the 25-minute picking operation, the worker took a farming posture according to the work content and performed farming work. Meanwhile, the posture of the worker was measured by the posture sensor, and typical examples are illustrated in FIGS.
When working with a farm cart, as shown in Fig. 10, when picking up a nearby ear, by stretching the upper limb in a sitting position, when collecting a slightly separated ear Is done while stretching the lower limbs and defeating the upper body. The working posture of S1 is a state in which the user is sitting on the chair 1 and working, and the working posture of S2 is a state in which an operation of collecting a slightly separated ear is being performed. On the other hand, when working according to conventional practice, as shown in FIG. 11, when picking up a nearby ear, it is done in an unreasonable posture with the knees bent deeply, and a slightly separated ear is collected. When you are in a painful posture with a middle waist.

The knee and waist bending angles during chrysanthemum picking work were measured as described above, and the measurement results before and after resting are illustrated in FIG. In addition, the average bending angles of knees and hips in all postures at the time of picking work are shown in Table 1 in comparison with the case where the work was performed using the agricultural cart and the case where the work was performed according to the conventional practice. .
The waist bending angle is the angle between the trunk and the thigh, and the larger it is, the lighter the burden on the waist. The knee bending angle is the angle between the thigh and the lower leg, and the larger the knee bending angle, This means that the burden is light.

表１に示す結果から、農作業用台車を用いた場合には、従来の慣行に従う場合に比べて、膝、腰への負担が軽減されていることがわかる。また、心拍数については、農作業用台車を用いた場合と、従来の慣行に従う場合とで２５分間の採穂作業を１０分間の休息を挟んで同じ被試験者（作業者）が２回行い、採穂作業中の平均心拍数により評価した。その結果を表２に示す。

From the results shown in Table 1, it can be seen that when the agricultural cart is used, the burden on the knees and hips is reduced as compared with the conventional practice. As for the heart rate, the same testee (worker) performs a 25-minute ear picking operation with 10 minutes rest when using a farm cart and following conventional practice, Evaluation was based on the average heart rate during the picking operation. The results are shown in Table 2.

表２に示す結果から、農作業用台車を用いた場合には、従来の慣行に従う場合に比べて、隣接作業間の比較で平均心拍数が５〜１０拍／分少なく、身体への負担が軽減されていることがわかる。農作業用台車を用いた場合の表面筋電位は、従来の慣行に従う場合を１００とし、それに対する表面筋電位の割合で評価した。その結果を表３に示す。

From the results shown in Table 2, when using a farm cart, the average heart rate is 5 to 10 beats / minute lower than the conventional practice, and the burden on the body is reduced. You can see that The surface myoelectric potential in the case of using a farm truck was set to 100 when the conventional practice was followed, and the surface myoelectric potential was evaluated based on the ratio. The results are shown in Table 3.

表３に示す結果から、農作業用台車を用いた場合には、各表面筋電位が従来の慣行に従う場合より著しく低下しており、各身体筋への負担が軽減されていることがわかる。疲労自覚症状については、３０項目の症状、５８箇所の身体部位に関して聞き取り調査を行い、訴えのあった自覚症状、疲労部位を表４に記載した。

From the results shown in Table 3, it can be seen that when the agricultural cart is used, each surface myoelectric potential is significantly lower than that in the conventional practice, and the burden on each body muscle is reduced. As for the subjective symptoms of fatigue, interviews were conducted with respect to 30 items of symptoms and 58 body parts.

表４に示す結果から、農作業用台車を用いた場合には、従来の慣行に従う場合に訴えの多い肩、腰、膝に対する負担が軽減されていることがわかる。以上のように農作業用台車を用いた場合には、従来の慣行に従う場合に比べて、身体への負担が軽減されるようになることに加え、農作業用台車を用いた場合には、１０００本の採穂作業に要する時間が慣行に従う場合の６６分から４４分にまで３３％短くなることも確認できた。

From the results shown in Table 4, it can be seen that when agricultural carts are used, the burden on shoulders, hips, and knees, which are often appealed when following conventional practices, is reduced. As described above, when the agricultural cart is used, the burden on the body is reduced as compared with the conventional practice. In addition, when the agricultural cart is used, 1000 It was also confirmed that the time required for the ear picking operation was reduced by 33% from 66 minutes to 44 minutes when the practice was followed.

(A) is a schematic side view of the work trolley | bogie which concerns on embodiment, (b) is the schematic front view. It is a schematic side view which shows the attachment state of the chair with which the agricultural-work trolley | bogie which concerns on embodiment was equipped. (A) is a schematic side view of the chair with which the work trolley | bogie which concerns on embodiment was equipped, (b) is the schematic front view. It is a fragmentary sectional view which shows the structure in the leg of the chair with which the working trolley | bogie which concerns on embodiment was equipped. (A) is a schematic side view (b) which shows the freedom degree of the chair with which the work trolley | bogie which concerns on embodiment was equipped is the same schematic front view. (A), (b) is a schematic plan view which shows the freedom degree of the turning-type tray stand with which the working trolley | bogie which concerns on embodiment was equipped. It is an exploded view which shows the structure of the turning-type tray stand with which the working trolley | bogie which concerns on embodiment was equipped. It is the schematic which shows the structure of the auxiliary wheel with which the working trolley | bogie which concerns on embodiment was equipped. It is explanatory drawing of the work pattern which compared the burden required to a body, and the time required to pick 1000. It is the schematic which shows the working posture which the operator at the time of using the working trolley | bogie which concerns on embodiment. It is the schematic which shows the working attitude | position which the operator in the case of following the conventional practice. It is the characteristic figure compared with the case where the working cart which concerns on embodiment about the bending angle of a worker's body is used, and the case where it follows conventional practice.

Explanation of symbols

1 Chair (chair body)
δ Floating amount from the ground when a chair is not used 1A Seat 1B Upper leg 1C Lower leg 1D Tube center of upper and lower legs 2 Bogie frame 2A, backrest 3 Connection member 3A, 3B Coil spring 4 Tray base 4A Frame 4B Arm plate 4C Support plate 4D Pedestal 5 Tray 6 Tire 6A Free wheel 6B Support body 7 Drive gear motor 8A Sprocket (number of teeth T = 17)
8B Chain belt 8C Sprocket (Number of teeth T = 26)
9A Control box 9B Remote control receiving antenna 9C Control box base 10 Moving direction by four wheels having tire 6 11 Ground 11A Vertical line
12 Seat surface 13 Posture stabilizing member 13A Connecting member fixing rivet hole 14 Coil spring 15 Connecting pin 15A Retaining element 16 Connecting pin 16A Retaining element a Distance between connecting pins 16 connecting the lower leg part to the posture stabilizing member b Lower leg part Vertical length of slits formed in 17, 17, 19 Inclined direction 19, 20, 21 Mounting screw 22 Washer 23 Nut 24 Lever 25 Support point 26 Lever arm 27 Wire 28 Conduit 29 Support center 30 Switching direction

Claims (5)

A chair comprising the agricultural working carriage, two legs above, is divided into the lower leg, upper leg portion is integral with the seat, and the upper, mounted sandwiched between the lower leg The leg length is made variable by a coil spring, the two legs are aligned in the front-rear direction along the carriage moving direction, and the lower legs of the two legs rotate around the pin via the posture stabilizing member. When the chair is not used, the posture stabilizing member is floated from the ground by the attachment mechanism to the carriage frame. When the chair is used, the posture stabilizing member is in contact with the ground. It is possible to change the height of the seat within a predetermined range by taking a work posture according to the work content, and to change the inclination of the seat back and forth, left and right chair for farm work that was provided in the farm work for the truck to The attachment mechanism to the bogie frame includes a connecting member having one end fixed to the posture stabilizing member and the other end extending to the lower portion of the bogie frame, and a bogie frame for applying an urging force to lift the chair body through the connecting member. The agricultural work chair provided in the agricultural work carriage according to claim 1, comprising coil springs arranged at two different places on the lower part. 3. The agricultural cart according to claim 1, wherein the posture stabilizing member is a pair of L-shaped members, and the connecting member fixed to the pair of L-shaped members is two flat members. the chair for farm work. The structure in which the length of the leg portion is variable is such that a slit having a length in the vertical direction corresponding to the contraction of the coil spring is formed at an opposing position across the center of the cylinder, and the inner diameter is larger than the inner cylinder. And an outer cylinder formed at a position facing the insertion hole of the coupling pin across the center of the cylinder, the inner cylinder being mounted on the outer cylinder into which the coil spring is inserted, and the pin hole of the coupling pin formed in the outer cylinder the position of inserting the connecting pin when the combination of the position of the slit formed in the inner cylinder, one of the claims 1-3, characterized in that a structure formed by connecting the inner cylinder and the outer cylinder by a connecting pin An agricultural work chair provided in the agricultural work carriage according to claim 1 . Agricultural working carriage characterized by comprising the agricultural chair according to any one of claims 1-4.

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