JP2004183496A - Backpack type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily operable backpack type working machine. <P>SOLUTION: A backpack type sprayer 10 is provided with a backpack frame 12, an internal combustion engine 18 and a recoil starter 38. A choke lever 30 for regulating an air inflow quantity to the internal combustion engine, a throttle lever 34 for regulating the output of the internal combustion engine, and a tip grip part 52 of a starter rope 42 extended from a starter body 40 of the recoil starter, are arranged on the left side of the internal combustion engine, and the throttle lever and the grip part are held by holding means 36, 50 provided at the side front part of the backpack frame. With this constitution, since the throttle lever, the choke lever and the grip part of the starter rope in need of adjustment when starting are on the same side, only the left side work of the backpack type working machine is required for starting operation in placed pulling, and restarting operation when back-pulling can be performed without passing a spray nozzle 26 held by the right hand, to the left hand. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a backpack working machine such as a backpack sprayer, and more particularly to a backpack working machine equipped with an internal combustion engine.
[0002]
[Prior art]
Some backpack-type work machines such as backpack sprayers and sprayers have an internal combustion engine as a power source for work. The internal combustion engine in such a working machine generally has a recoil starter for starting. As a method of starting an internal combustion engine with a recoil starter, the starter rope of the recoil starter is pulled and started while the work machine is placed on the ground, that is, a so-called `` placement '', and the starter rope is carried out while the worker is carrying the work machine. The so-called "back pulling" which is started by pulling is known.
[0003]
`` Depositing '' is an initial starting method generally performed when the internal combustion engine is cold, and usually, at the same time as the starter rope pulling operation, the choke lever is operated to adjust the amount of air flowing into the internal combustion engine, and the throttle is operated. Also operate the lever. When a priming pump for supplying fuel to the vaporizer is provided, the priming pump is operated as necessary.
[0004]
"Back pulling" is a method of starting the engine when the internal combustion engine is warm, and does not require operation of a choke lever, a throttle lever, or a priming pump. Conventionally, as described in Patent Document 1 below, a knob (grip) at the tip of a starter rope is attached to the right side of the backrest rack so that the "back pulling" can be easily performed. It is held at the front part, allowing right-handed operation.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. Hei 7-27411
[Problems to be solved by the invention]
By the way, in the conventional backpack-type working machine disclosed in Patent Document 1, the throttle lever is disposed at a front portion on the left side of the backpack to allow the engine output to be adjusted during work. I have. That is, for example, when the backpack-type work machine is a sprayer or a sprayer, the operator usually needs to operate the throttle lever with the left hand because the spray nozzle or the spray nozzle is held with the right hand, and the throttle lever is mounted on the backrest stand. It is located on the left. Further, since the throttle lever is a device related to the carburetor of the internal combustion engine, it is effective that the carburetor is also arranged on the side of the throttle lever, and accordingly, the choke lever and the priming pump are arranged on the left side.
[0007]
As described above, in the conventional configuration, the throttle lever, the choke lever, and the priming pump are arranged on the left side of the backrest base with respect to the internal combustion engine, whereas the starter rope knob is arranged on the right side. In the case of "deposit," the operation required for starting the internal combustion engine must be performed on the left and right, and the starting operation is complicated. In the case of "back pulling", since the knob of the starter rope and the spray nozzle are arranged on the same right side, it is necessary to switch the nozzle to the left hand and then hold the knob to pull, which lowers the work efficiency. There is a problem.
[0008]
The present invention has been made to solve such a problem, and has as its main object to provide a backpack-type working machine that facilitates a start operation of an internal combustion engine.
[0009]
[Means for Solving the Problems]
The present invention provides a backpack gantry (12), an internal combustion engine (18) installed on the backpack gantry (12) to generate working power, and an internal combustion engine (18). In a backpack type working machine (10) having a recoil starter (38) to be started, a choke lever (30) for adjusting an air flow rate to an internal combustion engine (18) and a throttle lever for adjusting an output of the internal combustion engine (18) (34) and the grip (52) at the tip of the starter rope (42) extending from the starter body (40) of the recoil starter (38) are either right or left with respect to the internal combustion engine (18). And a throttle lever (34) and a grip portion (52) provided on a side front portion of the backrest rack (12). It is characterized in that it is held by 50).
[0010]
According to this configuration, the throttle lever (34) and the choke lever (30), which need to be operated when the engine (18) is started by "pulling", and the grip (52) at the tip of the starter rope (42) are on the same side. Therefore, the workability of the engine (18) start operation is improved. When the grip (52), the choke lever (30), and the throttle lever (34) of the starter rope (42) are arranged on the left side, the grip () is held with the left hand while holding the spray nozzle (26) with the right hand. Since the starter rope (42) can be pulled by grasping the handle 52), "back pulling" can be easily performed.
[0011]
In the present specification, the terms indicating directions such as left, right, front, rear, up, down, etc. are based on a state in which the worker stands upright with the backpack-type work machine (10) as a reference. The direction to the work machine (10) is defined as "rearward".
[0012]
The grip (52) of the starter rope (42) is preferably held by holding means (36, 50) such that the pulling direction is obliquely upward. According to this configuration, the worker can easily pull the starter rope (42) and the workability is good.
[0013]
It is preferable that a portion of the starter rope (42) from the starter body (40) to the holding means (36, 50) is covered with a covering means (46, 48, 54) such as a tube (48). This is because the portion of the starter rope (42) extending from the starter body (40) is protected from liquid and the like.
[0014]
As the holding means (36, 50), a holder (50) having a through hole (51) of a predetermined length into which the starter rope (42) is inserted may be used. The means (46, 48, 54) are preferably a tube (48) which surrounds the starter rope (42) and is slidably fitted in the through hole (51). By slidably fitting the tube (48) into the through hole (51) of the holder (50), the total length of the tube (48) and the holder (50) becomes variable, and the position of the holder (50) is changed. Or, for example, deployment to other models becomes easy.
[0015]
Preferably, the holding means (36, 50) are detachably fixed to the backrest gantry (12). According to this configuration, the backrest gantry (12) and the holding means (36, 50) can be manufactured separately, so that each part can be manufactured as a unit.
[0016]
When the backpack type working machine (10) according to the present invention is a sprayer (10), that is, a drug tank (22) installed on a backpack stand (12) and a drug tank driven by an internal combustion engine (18) When a pump (16) for sucking and discharging the medicine from (22) and a nozzle (26) for ejecting the medicine discharged from the pump (16) are provided, a drain port (60) of the medicine tank (22) is provided. Is preferably provided on the side opposite to the side where the choke lever (30), the throttle lever (34) and the grip (52) are arranged. This is because there is no starter rope (42) or the like near the drain port (60), and drainage becomes easy.
[0017]
The pressure adjusting handle (58) for adjusting the discharge pressure of the pump (16) is preferably arranged on the same side as the choke lever (30), the throttle lever (34) and the grip (52). It is. This arrangement is to improve the workability by enabling the pressure adjustment operation to be performed with one hand on the same side as the case of the "pulling" or the operation of the throttle lever (34) during the operation.
[0018]
Further, it is preferable that the pressure adjusting handle (58) and the grip (52) are arranged at a predetermined gap. The pressure adjusting handle (58) is arranged at the center side of the backpack rack (12) and is a position where it is difficult to grasp by hand, but with a predetermined gap from the grip (52) outside the backpack rack (12). The arrangement makes it easier to grasp the position of the pressure adjustment handle (58) using the grip (52) as a clue.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of a backpack working machine according to the present invention will be described with reference to the accompanying drawings.
[0020]
FIG. 1 is a side view schematically showing a backpack sprayer 10 which is a backpack working machine according to the present invention, and FIG. 2 is a view seen from the rear. The backpack sprayer 10 is a device that is used in a state where an operator is carrying the machine and sprays a liquid medicine onto agricultural products and the like.
[0021]
As shown in the drawing, the backpack sprayer 10 includes a substantially L-shaped backpack base 12 having a pedestal portion 12a and a backrest portion 12b. Two shoulder straps 14 are attached to the backrest portion 12b so that the worker can carry the backrest gantry 12. In a normal use state in which an upright worker carries the backpack stand 12, the backrest portion 12b extends substantially vertically, and the pedestal portion 12a is substantially horizontal and extends away from the worker's back.
[0022]
A pump 16 and an internal combustion engine 18 which is a driving source of the pump 16 are installed on the pedestal portion 12a in order from the backrest portion 12b toward the rear. A fuel tank 20 that supplies fuel to the internal combustion engine 18 is disposed below the internal combustion engine 18. Above the pump 16, the internal combustion engine 18, and the fuel tank 20, a medicine tank 22 for storing a medicine for spraying is disposed, and is fixed to the backrest 12 b of the backrest rack 12.
[0023]
In this configuration, when the internal combustion engine 18 is operated and the pump 16 is driven, the medicine in the medicine tank 22 is sucked and discharged by the pump 16, and is sprayed from the spray nozzle 26 through the hose 24. Note that the backpack type sprayer 10 in the present embodiment is a general right-handed type, and the hose 24 is arranged on the right side of the sprayer 10 so that the spray nozzle 26 can be gripped with the right hand.
[0024]
The internal combustion engine 18 is provided with a carburetor 28 for mixing fuel and air, and is provided with a choke valve (not shown) for adjusting the amount of air to the carburetor 28 and, consequently, the internal combustion engine 18. Have been. This choke valve is mainly adjusted at the initial start of the internal combustion engine 18, and the adjustment is performed by operating a choke lever 30 arranged adjacent to the carburetor 28.
[0025]
Further, a throttle valve (not shown) for adjusting the amount of air to the internal combustion engine 18 and thus adjusting the output of the internal combustion engine 18 is further provided downstream of the carburetor 28. The throttle valve can be operated by a throttle lever 34 interlocked via a wire 32, and is also operated during a spraying operation.
[0026]
The sprayer 10 according to the present embodiment is for right-handed use as described above. During the spraying operation, the throttle lever 34 is operated by the left hand to handle the spray nozzle 26 with the right hand. For this reason, the throttle lever 34 is disposed at a front portion on the left side of the backrest gantry 12, and in the present embodiment, is attached to a throttle stay (retaining means) 36 which is detachably screwed to a front portion and a lower left portion of the pedestal portion 12a. Installed.
[0027]
As described above, since the throttle lever 34 is disposed on the left side of the backpack type sprayer 10 with respect to the internal combustion engine 18, the carburetor 28 and the choke lever 30 are also disposed on the left side of the sprayer 10 on the layout. Have been.
[0028]
The internal combustion engine 18 is provided with a recoil starter 38 as a device for starting the internal combustion engine 18. In the present embodiment, the recoil starter 38 is of a spring energy storage type as described in, for example, Japanese Utility Model Registration No. 3080656, and includes a starter body 40 integrally attached to a casing of the internal combustion engine 18; A starter pulley (not shown) disposed therein and connected to the rotating shaft of the internal combustion engine 18, a recoil pulley (not shown) provided opposite to the starter pulley, and a coil wound around the recoil pulley And a starter rope 42. A spring member (not shown) is provided between the recoil pulley and the starter pulley. In such a spring storage type recoil starter 38, when the starter rope 42 is pulled and the recoil pulley is rotated, the spring biasing force is accumulated in the spring material. As a result, the rotating shaft of the internal combustion engine 18 can be rotated, so that the internal combustion engine 18 can be reliably started even if the pulling force of the starter rope 42 is small.
[0029]
As clearly shown in FIG. 3 showing the state of the starter rope 42 extending from the starter body 40 of the recoil starter 38, the starter rope 42 extends from an outlet 44 provided at the lower left portion of the starter body 40. ing. The starter rope 42 is passed through a tubular rope guide 46 press-fitted into an outlet 44, and further passed through a flexible tube 48 fitted to the rope guide 46. The distal end of the starter rope 42 projecting from the tube 48 is passed through a straight through hole 51 provided in a holder (holding means) 50. A knob 52 serving as a grip when pulling the starter rope 42 is attached to a tip of the starter rope 42. The knob 52 has a T-shape, and a starter rope 42 is inserted into a through hole 53 provided at the center thereof, and is connected at the tip. The knot 43 is larger than the through hole 53 of the knob 52, so that the knob 52 does not fall off the starter rope 42. In a state where the recoil starter 38 is not used (the state of FIGS. 1 to 3), the knob 52 is in contact with and held on the front surface of the holder 50.
[0030]
The holder 50 is fixed to the throttle stay 36. Therefore, the knob 52 is arranged at the left front part of the backrest rack 12. In the holder fixed state, the through hole 51 of the holder 50 is formed so as to be obliquely upward toward the front. Therefore, the pulling direction of the starter rope 42 or the pulling direction of the knob 52 is forward and obliquely upward.
[0031]
The holder 50 is preferably detachably fixed to the throttle stay 36 by means such as screwing. Thus, the recoil starter 38 including the holder 50 can be configured as an integrated unit. After the recoil starter 38 of the internal combustion engine 18 is assembled, the holder 50 and the throttle stay 36 may be combined, and the components may be combined. Will contribute to the improvement of productivity. In addition, the unitization is advantageous for maintenance.
[0032]
The through hole 51 of the holder 50 includes two portions 51a and 51b, a rear portion and a front portion. The inner diameter of the rear portion 51a is substantially the same as or slightly smaller than the outer diameter of the tube 48. Therefore, the tube 48 can slide in the through hole 51. On the other hand, the front portion 51 b of the through hole 51 has an inner diameter smaller than the outer diameter of the tube 48. Therefore, the tube 48 is in contact with the step surface 51c between the front part 51b and the rear part 51a so as not to move forward any more. In this configuration, since the holder 50 can be moved with respect to the tube 48, the length from the end of the tube 48 (the end on the rope guide 46 side) to the front surface of the holder 50 can be changed. Accordingly, by appropriately determining the length of the through hole 51 of the holder 50, particularly the length of the rear portion 51a, not only the position of the holder 50 with respect to the throttle stay 36 but also the dimensional error of the components can be absorbed, and the internal combustion engine 18 can be absorbed. Deployment to other models with different mounting positions becomes easy.
[0033]
Further, it is preferable that a cylindrical adapter 54 is press-fitted into the front portion 51b of the through hole 51 in the holder 50. The adapter 54 has a portion 54 a projecting forward from the through hole 51, and the projecting portion 54 a comes into contact with the knob 52. Thus, when the recoil starter 38 is not used, the knob 52 contacts the adapter 54 and functions to close the open end 55 of the adapter 54. From such a function, it is preferable to be made of an elastic material such as synthetic rubber.
[0034]
When the knob 52 contacts the adapter 54 and its open end 55 is closed, the starter rope 42 is entirely covered by the covering means consisting of the adapter 54, the holder 50, the tube 48 and the rope guide 46. Therefore, the portion of the starter rope 42 extending from the starter main body 40 is not directly exposed to liquids such as chemicals and rainwater. Therefore, the liquid hardly penetrates the starter main body 40 along the starter rope 42, and it is possible to prevent a problem that the components such as the recoil starter 38 and the internal combustion engine 18 are corroded.
[0035]
Further, in the present embodiment, a priming pump 56 for bleeding air when the internal combustion engine 18 is started is disposed between the internal combustion engine 18 and the carburetor 28. Since the carburetor 28 is disposed on the left side with respect to the internal combustion engine 18, the priming pump 56 is also disposed on the left side.
[0036]
The pump 16 is provided with a pressure adjusting device (not shown) for adjusting the pump discharge pressure, and a pressure adjusting handle 58 for adjusting the pressure is disposed on the left side of the pump 16. It should be noted that the pump 16 is located at a position between the backrest 12 and the internal combustion engine 18, and therefore, the pressure adjustment handle 58 is also located at a position where it is difficult to operate. Therefore, for the reason described later, the pressure adjustment handle 58 is disposed at a position adjacent to the knob 52 of the starter rope 42 at substantially the same height with a predetermined gap.
[0037]
Further, a drain port 60 for drainage is provided at the lower right side of the medicine tank 22. In the drawing, reference numeral 62 denotes a stop button 62 attached to the throttle stay 36, which is used when the internal combustion engine 18 is stopped.
[0038]
Next, the operation of the backpack sprayer 10 having the above configuration will be described.
[0039]
First, in the case of performing the start in a state where the internal combustion engine 18 is cold, that is, the so-called initial start, it is effective to perform the “delay” as in the related art. That is, the backpack sprayer 10 is placed on the ground, the knob 52 is held, and the starter rope 42 is pulled. At this time, the priming pump 56 is operated to supply fuel into the carburetor 28, the choke lever 30 is closed to set the throttle lever 34 to the middle speed position, and operations necessary for the initial start are performed. According to the present embodiment, the priming pump 56, the choke lever 30, the throttle lever 34, and the knob 52, which are operating devices used when starting the internal combustion engine 18, are all concentrated on the left side. For this reason, when starting the engine 18, necessary operations can be performed from one of the left sides, and the labor of the operator is reduced, and the operation time is shortened. Further, since the knob 52 is held obliquely upward and the direction in which the starter rope 42 is pulled is obliquely upward, the operator can easily pull the knob 52 with the right hand while holding the sprayer 10 with the left hand even in the standing posture. be able to.
[0040]
When the internal combustion engine 18 starts, the choke lever 30 is closed and the throttle lever 34 is set to the low speed position. Then, the operator carries on the backpack sprayer 10 and starts spraying.
[0041]
During the spraying operation, the operator holds the spray nozzle 26 with the right hand and performs the operation. At this time, if necessary, the output of the internal combustion engine 18 is adjusted by operating the throttle lever 34 with the left hand. When the pressure of the pump 16 needs to be adjusted during the operation, the operator operates the pressure adjusting handle 58 with the left hand. Since the pressure adjustment handle 58 is located on the left inside of the backrest gantry 12, it is difficult for the operator to directly search the pressure adjustment handle 58 with his / her hand while facing forward. However, as described above, since the gap between the pressure adjusting handle 58 and the knob 52 is set to a predetermined size, the knob 52 which is relatively easy to find even with the rear hand is first searched, and the pressure is further adjusted by using the clue as a clue. The handle 58 can be groped, and the pressure adjustment handle 58 can be easily found to adjust the pressure.
[0042]
During the spraying operation, when the internal combustion engine 18 is stopped for some reason and it is desired to restart the engine 18 immediately, or when the medicine tank 22 is emptied and restarted after replenishing the medicine, the worker is required to carry on the backpack type sprayer. The "back pulling" of pulling the knob 52 of the starter rope 42 without lowering the 10 from the back is performed. In this case, the internal combustion engine 18 is already warm, and it is not necessary to adjust the priming pump 56, the choke lever 30, and the throttle lever 34, and only the knob 52 needs to be pulled. At this time, it is considered that the operator holds the spray nozzle 26 with his right hand during the spraying operation. However, according to the present embodiment, since the knob 52 is on the left hand side of the operator, the internal combustion engine 18 can be restarted by pulling the knob 52 with the left hand without holding the spray nozzle 26, thereby reducing labor. , Shortens working hours. In addition, in this embodiment, since the spring energy storage type recoil starter 38 which requires a small pulling force is used, the pulling can be easily performed even with the left hand.
[0043]
When the spraying operation is completed, the internal combustion engine 18 is stopped by pressing the stop button 62. The operation can be performed with the left hand while holding the spray nozzle 26 with the right hand.
[0044]
When it is desired to extract the medicine from the medicine tank 22, the medicine is discharged from the drain port 60 of the medicine tank 22. The drain port 60 is provided on the right side opposite to the knob 48 and the tube 48 covering the choke lever 30, the throttle lever 34, the starter rope 42. Therefore, there is no obstacle to the opening / closing operation of the drain port 60 or the placement of a liquid receiver such as a bucket near the drain port 60, and the operation becomes easy, and the drainage of the throttle lever 34, the choke lever 30, etc. There is no need to worry about contamination by drainage.
[0045]
As described above, the preferred embodiments of the present invention have been described in detail, but it goes without saying that the present invention is not limited to the above embodiments.
[0046]
For example, in the above embodiment, the choke lever 30, the throttle lever 34, the grip portion (knob) 52 of the starter rope 42, and the like are arranged on the left side in consideration of right-hand use, but these are concentrated on the opposite side. May be placed.
[0047]
The backpack working machine according to the present invention is not limited to a sprayer, but can be applied to all backpack working machines that use the internal combustion engine 18, such as backpack sprayers, backpack blowers, backpack brush cutters, and the like.
[0048]
Furthermore, in the above embodiment, the recoil starter 38 of the spring energy storage type is used, but a recoil starter of another type may be used.
[0049]
【The invention's effect】
As described above, according to the present invention, since the operation devices required for starting the internal combustion engine are concentrated on the left or right side, the operation necessary for starting the engine can be performed from only one side. . Therefore, complicated operations at the time of starting the engine can be simplified, the operability is excellent, the operation time can be reduced, and the labor can be reduced.
[0050]
In addition, for example, when the grip portion of the starter rope is arranged on the left side, the backing can be performed with the left hand while holding the work jig (spray nozzle) with the right hand, which is the dominant hand, so that the work is not interrupted. It is possible to restart, which contributes to improvement of workability.
[Brief description of the drawings]
FIG. 1 is a schematic side view of a backpack type sprayer according to an embodiment of the present invention.
FIG. 2 is a schematic view of the backpack type sprayer shown in FIG. 1 as viewed from the rear.
FIG. 3 is a partially sectional side view showing in detail a starter rope peripheral portion in the backpack type sprayer in FIGS. 1 and 2;
[Explanation of symbols]
DESCRIPTION OF REFERENCE NUMERALS 10: backpack sprayer, 12: backpack, 16: pump, 18: internal combustion engine, 30: choke lever, 34: throttle lever, 36: throttle stay (holding means), 38: recoil starter, 42: starter rope 46 ... rope guide (covering means), 48 ... tube (covering means), 50 ... holder (holding means), 51 ... through-hole, 52 ... knob (grip), 54 ... adapter (covering means), 58 ... pressure regulation Handle, 60 ... drain port.

Claims (7)

A backpack stand (12),
An internal combustion engine (18) installed on the backrest mount (12) to generate working power;
A recoil starter (38) provided in the internal combustion engine (18) for starting the internal combustion engine (18);
In a backpack type working machine (10) provided with:
A choke lever (30) for adjusting the amount of air flowing into the internal combustion engine (18), a throttle lever (34) for adjusting the output of the internal combustion engine (18), and a starter body (40) of the recoil starter (38) ) And a grip (52) at the tip of a starter rope (42) are disposed on one of the right side and the left side with respect to the internal combustion engine (18), and
The backpack type work, wherein the throttle lever (34) and the grip portion (52) are held by holding means (36, 50) provided at a side front portion of the backrest mount (12). Machine. The backpack working machine according to claim 1, wherein the grip portion (52) is held by the holding means (36, 50) so that a pulling direction is obliquely upward. The starter rope (42) between the starter body (40) and the holding means (36, 50) is covered by a covering means (46, 48, 54). The backpack working machine described. The holding means (36, 50) includes a holder (50) having a through hole (51) of a predetermined length into which the starter rope (42) is inserted, and the covering means (46, 48, 54). 4) comprises a tube (48) surrounding the starter rope (42) and slidably fitted into the through hole (51). The backpack working machine according to any one of claims 1 to 4, wherein the holding means (36, 50) is detachably fixed to the backrest mount (12). A medicine tank (22) installed on the backrest (12), a pump (16) driven by the internal combustion engine (18), and for sucking and discharging medicine from the medicine tank (22); A nozzle (26) for ejecting the medicine discharged from (16),
A drain port (60) of the chemical tank (22) is provided on a side opposite to a side where the choke lever (30), the throttle lever (34) and the grip portion (52) are arranged. The backpack type working machine according to any one of claims 1 to 5. A pressure adjusting handle (58) for adjusting the discharge pressure of the pump (16) is arranged on the same side as the choke lever (30), the throttle lever (34) and the grip (52). 7. The backpack working machine according to claim 6, wherein the pressure adjusting handle (58) and the grip portion (52) are arranged with a predetermined gap.

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