JP3566030B2 - Backpack type power working machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bush cutter, a hedge trimmer, and other backpack-type power working machines, and more particularly, to a backrest in which an internal combustion engine unit including, for example, a small air-cooled two-cycle gasoline engine is rotatably supported about a vertical axis. The present invention relates to a backpack type power working machine.
[0002]
[Prior art]
This type of backpack-type power working machine is used by rotating the internal combustion engine unit as necessary, and pulling out a working tool extending from the internal combustion engine unit in a direction in which a worker carrying the backpack can work easily. It was made possible. According to the backpack-type power working machine, for example, right-handed, left-handed, or the like, the drawer position of the working tool is changed to the right or left of the worker's body in accordance with the dominant arm of the worker, or In addition, the drawer position of the work tool can be appropriately changed so as to facilitate the work in response to various changes in the work environment such as the inclination of the work site, which is convenient.
[0003]
In the backpack-type power working machine as described above, when the internal combustion engine unit is freely rotatable with respect to the backrest, the work implement may be moved when the work implement is pulled out or during work. Since there is a case where the work tool is damaged by strong contact with the vertical frame portion of the rack or the worker, the rotation angle of the internal combustion engine unit is conventionally set so that the work tool does not contact the backrest or the worker. Is fixed to the backrest side, for example, to limit the angle of rotation to within a predetermined allowable rotation angle range.
[0004]
Further, even within the allowable rotation angle range, depending on the direction of the internal combustion engine unit, the exhaust port of the exhaust muffler constituting the internal combustion engine unit faces the direction of the worker (back support side). There is a danger that the internal combustion engine will be exposed to heat exhaust, so that, for example, the rotation angle of the internal combustion engine is adjusted so that the exhaust of the internal combustion engine is not directed toward the worker. A second stopper for restricting the movement angle within the range is provided on the backrest side so as to be detachable, and the work is performed by attaching and detaching the second stopper as necessary.
[0005]
[Problems to be solved by the invention]
However, when attaching and detaching the second stopper, the work must be interrupted, so that there is a problem that the work efficiency is poor and the attaching and detaching work is complicated.
[0006]
The present invention has been made in view of such circumstances, and a problem to be solved is to provide a backpack type power working machine capable of performing work quickly and efficiently.
[0007]
[Means for Solving the Problems]
In order to solve the above problem, a backpack type power working machine according to the present invention according to claim 1 is an internal combustion engine rotatably supported on a backrest within a predetermined allowable rotation angle range around a vertical axis. Part and the rotation angle of the internal combustion engine part is restricted within the safe rotation angle range within the allowable rotation angle range so that the exhaust of the internal combustion engine part does not face the worker carrying the backrest. And a movable stopper that performs the operation.
[0008]
According to this, the movable stopper prevents the exhaust of the internal combustion engine from being directed to the worker within the allowable rotation angle range, so that it is safe. In addition, since the rotation angle regulation of the internal combustion engine can be released simply by moving the movable stopper as needed, the operation of releasing the rotation angle regulation can be easily and quickly performed, and the work efficiency is improved. I do.
[0009]
According to a second aspect of the present invention, there is provided a backpack type power working machine comprising: an internal combustion engine portion rotatably supported on a backrest on a vertical axis; and a rotation angle of the internal combustion engine portion is an allowable rotation angle. A fixed stopper for regulating the rotation angle of the internal combustion engine unit within the allowable rotation angle range so that the exhaust of the internal combustion engine unit does not face the worker carrying the backrest. And a movable stopper that regulates the movable stopper within a moving angle range .
[0010]
In this case, the rotation angle of the internal combustion engine is restricted within the allowable rotation angle range by the fixed stopper . The movable stopper regulates the rotation angle of the internal combustion engine within the safe rotation angle range within the allowable rotation angle range, so that the exhaust gas from the internal combustion engine portion carries the backrest. To the worker who is working.
[0011]
If it is desired to release the regulation of the rotation angle of the internal combustion engine by the movable stopper, it is sufficient to move the movable stopper as needed. Therefore, the rotation angle restriction releasing operation can be performed simply and quickly, and the working efficiency is improved.
[0012]
According to a third aspect of the present invention, a backpack type power working machine according to the present invention is provided with an internal combustion engine portion rotatably supported on a backrest and about a longitudinal axis, and carrying the backrest extending from the internal combustion engine portion. A working tool used by a worker who changes the pull-out position as appropriate, and a turning angle of the internal combustion engine unit within an allowable turning angle range so that the working tool does not contact the backrest or the worker. A movable stopper that restricts the rotation angle of the internal combustion engine to a safe rotation angle within the allowable rotation angle range so that the exhaust of the internal combustion engine does not face the operator. And a stopper.
[0013]
The worker rotates the internal combustion engine in accordance with his or her dominant arm, working environment, or the like, and performs work by, for example, selectively pulling out the working tool from the right or left side of the worker to the front. At this time, the function of the fixed stopper prevents the work implement from contacting the backrest or the worker. Further, the movable stopper prevents the exhaust of the internal combustion engine from being directed to the worker. By simply moving the movable stopper as needed, the rotation angle range of the internal combustion engine can be freely changed between the safe rotation angle range and the allowable rotation angle range. Therefore, the rotation angle range of the internal combustion engine can be easily and quickly changed, and the work can be performed efficiently.
[0014]
According to a fourth aspect of the present invention, there is provided a backpack type power working machine according to the first, second or third aspect , wherein the movable stopper abuts on a locking portion on the internal combustion engine side. The urging member is always urged to advance to the position, and is manually operable so as to retreat from the rotation restricting position to a restriction releasing position which does not abut on the locking portion.
[0015]
With this configuration, the configuration is simple, which can contribute to cost reduction.
[0016]
According to a fifth aspect of the present invention, there is provided a backpack type power working machine according to the first, second or third aspect , wherein the movable stopper abuts on a locking portion on the side of the internal combustion engine. Manual operation by the worker while carrying the backrest so as to always urge it to advance to the position, and to retreat from the rotation restriction position to the restriction release position where it does not abut on the locking portion. It was a free one.
[0017]
According to this, in addition to being simple in configuration, which can contribute to cost reduction, the movable stopper can be operated while carrying the backrest, so that work can be performed more quickly and efficiently. it can.
[0018]
According to a sixth aspect of the present invention, there is provided a backpack type power working machine according to the fourth or fifth aspect , wherein the locking portion of the internal combustion engine unit enters a rotation restricted range by the movable stopper. At this time, the rotation stopper is forcibly released from the rotation restriction position by being pushed by the locking portion.
[0019]
According to this configuration, when the locking portion of the internal combustion engine enters the rotation restriction range of the movable stopper, the operation of the movable stopper is unnecessary, and the locking portion is rotated by the movable stopper. Only when the movable stopper is released from the movement restriction range, the movable stopper may be manually operated. Therefore, the frequency of manual operation of the movable stopper is halved, and the operation can be performed even more quickly and efficiently.
[0020]
According to a seventh aspect of the present invention, there is provided a backpack type power working machine according to the fourth, fifth or sixth aspect , wherein the movable stopper is rotatable along a rotation plane of the locking portion. It is a structured one. According to this, the operation of the movable stopper becomes smoother and more reliable, which is preferable.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIGS. 1 to 6 show a first embodiment of the present invention. FIG. 1 shows an internal combustion engine unit of a backpack brush cutter as an example of a backpack power working machine according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view of a main part of FIG. 1, FIG. 3 to FIG. 5 are schematic plan views showing a rotational movement state of an internal combustion engine unit with respect to a backpack, and FIG. It is a whole perspective view of a type brush cutter.
[0023]
As shown in FIGS. 1 and 6, the backpack-type brush cutter includes a backrest 1 having a backrest 1d. As shown in FIGS. 1 and 2, a base plate 2 is horizontally attached to a horizontal portion 1a extending rearward of the backrest 1 through vibration isolating rubbers 1c, 1c, 1c. As shown in FIG. 2, an engine support plate 4 is provided on the base plate 2 via a ball bearing 3 so as to be rotatable about a vertical axis Y. It is rotatably connected to the base plate 2 by mounting bolts 15.
[0024]
On the engine support plate 4, for example, an internal combustion engine unit 5 including a small air-cooled two-cycle internal combustion engine 6, an air cleaner 7, an exhaust muffler 8, a fuel tank 9, and the like are supported.
[0025]
As shown in FIG. 6, a working tool 10 extends from the internal combustion engine unit 5. The work implement 10 is to be carried by a worker 16 carrying the backrest 1 in his hand. The working tool 10 in the illustrated example is a cutting blade device. The cutting blade device has a cutting blade 11 driven by the engine 6 and the cutting blade 11 at a tip end thereof and controls the power of the engine 6. An operation rod 12 having a transmission shaft (not shown) for transmitting the power to the cutting blade 11 inserted therein, and a flexible tube 13 covering a flexible shaft connected to the transmission shaft between the engine 6 and the rear end of the operation rod 12. And
[0026]
After starting the engine 6, the worker 16 carries the backrest 1 with a pair of left and right shoulder bands 14, 14, grasps the handles 12 a, 12 b provided on the operation rod 12 by hand, and sets the throttle lever. 13a is operated with a finger, and the cutting blade 11 is swung right and left to perform a mowing operation.
[0027]
In the backpack-type brush cutter, a pair of left and right stoppers 17 and 18 are fixed on the base plate 2 on a circumference centered on the vertical axis Y as shown in FIG. The pair of left and right fixed stoppers 17 and 18 abut against a stopper locking projection 20 provided as a locking portion on the lower surface on the side of the internal combustion engine unit 5, and the excessive rotation about the longitudinal axis Y of the internal combustion engine unit 5 is performed. Rotation is prevented, and the rotation angle of the internal combustion engine unit 5 is restricted within a predetermined allowable rotation angle range α (see FIG. 7).
[0028]
Specifically, the pair of left and right fixed stoppers 17 and 18 are used, for example, when the internal combustion engine unit 5 is rotated to change the draw-out position of the work implement 10. However, this is for restricting the rotation range so as not to be hit against the pair of left and right vertical frame portions 1b, 1b of the backrest 1 and the worker 16.
[0029]
The pair of left and right fixed stoppers 17 and 18 are formed as an integral plate, and are mounted on the base plate 2 at positions behind the ball bearing 3 by bolts 19 and 19. At an appropriate position on the lower surface of the engine support plate 4, the stopper locking projections 20 that abut against the pair of left and right stoppers 17 and 18 from outside thereof are projected downward.
[0030]
Here, the functions of the pair of left and right stoppers 17, 18 and the stopper locking projection 20 will be described more specifically.
[0031]
FIG. 3 shows a normal use state, which is commonly referred to as right pointing. That is, the working tool 10 is in a used state in which the working tool 10 is pulled out to the right side of the body of the worker 16 carrying the backrest 1.
[0032]
In the right-hand use state, the stopper locking projection 20 abuts against the outer surface of the left stopper 17, and the flexible tube 13 is strong against the right vertical frame 1 b of the backrest 1, the worker 16, and the like. Further left rotation of the internal combustion engine part 5 is prevented so that it does not come into contact.
[0033]
On the other hand, FIG. 4 shows a use state commonly referred to as left-handed. That is, the working tool 10 is in a use state in which the working tool 10 is pulled out to the left side of the body of the worker 16 carrying the backrest 1.
[0034]
In the left-handed use state, the stopper locking projection 20 comes into contact with the outer side surface of the right stopper 18, and the flexible tube 13 is strong against the left vertical frame portion 1 b of the backrest 1, the worker 16, and the like. Further rotation of the internal combustion engine 5 to the right is prevented so as to avoid contact.
[0035]
By the way, in the left-hand use state shown in FIG. 4, the left rotation of the internal combustion engine unit 5 is not restricted. For this reason, due to the arrangement of the respective members of the internal combustion engine unit 5, the exhaust port 8a of the exhaust muffler 8 is connected to the worker 16 during the mowing operation performed while swinging the work implement 10 right and left. It may turn to the back side.
[0036]
That is, in this type of working machine, in consideration of the most frequently used state (usually used state) of the right-handed worker in the so-called right-handed operation, generally, as shown in FIG. The respective members of the internal combustion engine unit 5 are arranged such that the exhaust port 8a of the exhaust muffler 8 is located at the farthest position immediately behind the worker 16 in the normal use state. Therefore, in the normal use state, the exhaust port 8a of the exhaust muffler 8 does not face the back side of the worker 16 unless there is an excessive amount.
[0037]
On the other hand, when the work is performed with the work implement 10 left-positioned as shown in FIG. 4, when the distal end side of the work implement 10 is largely swung to the left of the worker 16, the work follows. As shown in FIG. 5, the exhaust port 8a of the exhaust muffler 8 becomes closer to the back of the worker 16 as the internal combustion engine unit 5 rotates greatly. When the work implement 10 is further swung to the left, the exhaust port 8a of the exhaust muffler 8 faces the worker 16, and the worker 16 receives heat exhaust.
[0038]
Therefore, conventionally, when changing the work implement 10 to the left-handed position, the backrest 1 is temporarily lowered from the shoulder, and the work implement 10 and the internal combustion engine unit 5 are rotated to the right side so that the work implement 10 Is pulled out to the left side of the backrest 1, and then a second stopper that abuts against the stopper locking projection 20 to prevent the internal combustion engine unit 5 from rotating leftward by a predetermined angle or more is attached to the base plate 2. It was fixed in place by screws.
[0039]
However, once the second stopper is fixed with a screw, even if it is attempted to change the working tool 10 to the original right-handed position according to changes in various working environments, such as the inclination direction and the inclination angle of the work site. However, the direction cannot be changed as it is because the second stopper interferes, and the mowing operation must be interrupted to remove the second stopper. For this reason, in the above-mentioned conventional method, there were problems that the attaching and detaching work of the second stopper was complicated and the efficiency of mowing was poor.
[0040]
Therefore, in the present embodiment, as shown in FIGS. 1 and 2, a movable stopper 21 is mounted on the base plate 2 instead of the detachable second stopper. The movable stopper 21 contacts the stopper locking projection 20 so that the exhaust of the internal combustion engine unit 5 does not face the backrest 1 during the left-handed operation, and the movable stopper 21 rotates the internal combustion engine unit 5. The movement angle is restricted within a predetermined safe rotation angle range β within the allowable rotation angle range α (see FIG. 7).
[0041]
The movable stopper 21 in the first embodiment has a rod shape, and is provided movably in the length direction along a radial direction of an arc centered on the vertical axis Y. A cylindrical body 23 extending in the radial direction of an arc centered on the vertical axis Y is fixed on the base plate 2, and the movable stopper 21 is inserted into the cylindrical body 23.
[0042]
The movable stopper 21 is constantly urged inwardly of the base plate 2 by a spring 22 inserted into the cylindrical body 23, and the inner end thereof is formed by the stopper locking projection 20. It advances on the rotation orbit and is always at the rotation restricting position on the rotation orbit. When a finger is hooked and pulled outward on, for example, a ring-shaped manual operation portion 21 a formed at an outer end portion of the movable stopper 21, the movable stopper 21 is moved from the rotation trajectory of the stopper locking projection 20. Retreats to the regulation release position that has moved outward. When the hand is released from the manual operation portion 21a, the movable stopper 21 returns to the rotation restricting position again by the urging force of the spring 22.
[0043]
The movable stopper 21 is provided within a range where the hand of the worker 16 can reach easily so that the worker 16 can easily operate the backrest 1 by turning his or her hand backward while carrying the backrest 1. , So that it is easy to pull.
[0044]
When the worker 16 who has been mowing in the right-inserted state shown in FIG. 3 changes the pull-out position of the work implement 10 to the left-inserted state shown in FIG. With the work tool 10 placed on the ground or the like, once release the hands from the handles 12a and 12b, turn the right hand backward and pull the manual operation portion 21a of the movable stopper 21 outward to the right, 16 itself turns left. Then, after the stopper locking projection 20 passes through the right stopper 18 without being locked by the movable stopper 21, the manual operation portion 21a is released.
[0045]
In the left-handed use state obtained in this manner, the rotation angle range of the stopper locking projection 20 is restricted within the safe rotation angle range β between the right stopper 18 and the movable stopper 21, Correspondingly, the rotation angle range of the internal combustion engine unit 5 is restricted within the safe rotation angle range β. Therefore, even if the worker 16 swings the tip side of the work implement 10 largely leftward during the so-called left-cutting mowing work, the position of the exhaust port 8a of the exhaust muffler 8 is changed to the position shown in FIG. Therefore, the worker 16 does not face the backrest 1 and is prevented from being exposed to the heat exhaust.
[0046]
When returning the work implement 10 to the right-inserted state, the work implement 10 may be placed in the same manner as described above, the movable stopper 21 may be pulled, and the worker 16 may rotate rightward, contrary to the above. .
[0047]
As described above, the worker 16 can easily change the pull-out direction of the work implement 10 while carrying the backrest 1, so that the efficiency of mowing can be reduced as compared with the conventional method. Is improved.
[0048]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0049]
FIG. 7 shows a main part of a working machine according to a second embodiment of the present invention. The second embodiment is provided with a stopper locking projection 24 having a different shape from the stopper locking projection 20 in the first embodiment, and other configurations are the same as those of the first embodiment. Same as the ones.
[0050]
The stopper locking projection 24 is used to move the surface 25 on the side that comes into contact with the movable stopper 21 when the movable stopper 21 enters the rotation restriction range (the safe rotation angle range β) by the movable stopper 21. It is a slope that can climb up and retreat. In this case, the worker 16 himself rotates to the left with the work tool 10 placed on the ground or the like in order to change the work tool 10 to the left position. 7, as shown by the arrow in FIG. 7), the movable stopper 21 is pushed by the slope-shaped surface 25 of the stopper locking projection 24 to move the movable stopper 21 from the rotation restricting position. Since the movable stopper 21 is forcibly detached outward, there is no need to manually operate the movable stopper 21. Therefore, the change of the draw-out position of the working tool 10 is further facilitated, which is preferable.
[0051]
Next, a third embodiment of the present invention will be described with reference to FIGS.
[0052]
The third embodiment is provided with a movable stopper 26 having a configuration different from that of the movable stopper 21 in the first embodiment, and the other configuration is the same as that of the first embodiment. is there.
[0053]
The movable stopper 26 in the third embodiment is pivotally held on the base plate 2 by a pin 27 extending parallel to the longitudinal axis Y, and rotates along a rotation plane of the stopper locking projection 20. It is free. The movable stopper 26 has a substantially U-shaped plate shape when viewed from above, and the pin 27 is inserted through a bent portion 26b.
[0054]
The swinging one end 26a of the movable stopper 26 is rotated clockwise as viewed in FIG. 9 by a spring 28 wound around the pin 27 so as to swing forward on the rotation orbit of the stopper locking projection 20. Biased in the direction. A movable stopper receiver 29 that abuts the movable stopper 26 and receives the urging force of the spring 28 is fixed on the base plate 2 at a position that does not hinder the rotation of the stopper locking projection 20. I have. Due to the movable stopper receiver 29 and the spring 28, the swinging one end 26a of the movable stopper 26 is always in a rotation restricting position on the rotation track of the stopper locking projection 20 (solid line in FIG. 9). (The position shown by).
[0055]
On the other hand, a manual operation unit 30 is integrally formed with the other end 26c of the swing of the movable stopper 26. The manual operation unit 30 moves the swinging one end 26a against the urging force of the spring 28 so that the stopper locking projection 20 is deviated outward from the rotation path (see FIG. 9). (A position shown by a two-dot chain line). The manual operation unit 30 is provided within a range where the hand of the worker 16 can easily reach, so that the worker 16 can easily turn the back of the backrest 1 and turn his / her hand backward for easy operation. The movable stopper 26 is arranged in a direction that facilitates the retraction swing operation.
[0056]
According to the third embodiment, in order to change the work tool 10 to the left-handed position, the work tool 10 is placed on the ground or the like, and the worker 16 rotates leftward (at this time, the stopper When the locking projection 20 is relatively rotated rightward as indicated by the arrow in FIG. 9), the swinging one end 26a of the movable stopper 26 is automatically moved by the stopper locking projection 20. Since the movable stopper 26 is pushed outward from the rotation restricting position, there is no need to manually operate the movable stopper 26. Therefore, similarly to the second embodiment, the change of the draw-out position of the working tool 10 is further facilitated, which is preferable.
[0057]
Further, since the movable stopper 26 is rotatable along the rotation plane of the stopper locking projection 20, the stopper locking projection 20 is rotated by the movable stopper 26 (the rotation restricting range (the safe rotation). The automatic retreat operation of the movable stopper 26 when entering the angle range β) is smoother and more reliable.
[0058]
In the illustrated example, in the movable stopper 26, the stopper locking projection 20 is moved into a rotation restriction range (the safe rotation angle range β) by the stopper receiving portion 26d of the movable stopper 26 and the right stopper 18. Since the surface 31 on the side that comes into contact with the stopper locking projection 20 when entering is formed in a slope shape inclined in the direction in which the stopper locking projection 20 passes, the automatic retreat operation of the movable stopper 26 is further enhanced. It is smooth and reliable.
[0059]
When releasing the stopper locking projection 20 from the safe rotation angle range β, the worker 16 puts a finger on the manual operation unit 30 and the swinging one end 26a of the movable stopper 26 releases the restriction release. The movable stopper 26 may be manually swung to retract to the position.
[Brief description of the drawings]
FIG. 1 is a perspective view of a portion of a backpack-type brush cutter as an example of a backpack-type power working machine according to a first embodiment of the present invention, on which an internal combustion engine is mounted.
FIG. 2 is an exploded perspective view of a main part of FIG.
FIG. 3 is a schematic plan view showing a state in which the internal combustion engine unit is right-handed with respect to the backrest.
FIG. 4 is a schematic plan view showing a state in which the internal combustion engine unit is left-handed with respect to the backrest.
FIG. 5 is a schematic plan view showing a state of rotational movement of the internal combustion engine with respect to the backrest.
FIG. 6 is an overall perspective view of the backpack-type brush cutter shown in FIG. 1;
FIG. 7 is a plan view of a base plate portion according to a second embodiment of the present invention.
FIG. 8 is a perspective view of a base plate portion in a third embodiment of the present invention.
FIG. 9 is a plan view of a main part of FIG. 8;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Backpack 5 Internal combustion engine part 10 Work implement 16 Workers 17, 18 Fixed stopper 20 Stopper locking projection (locking part)
21 Movable stopper 24 Stopper locking projection (locking part)
26 Movable stopper Y Vertical axis α Allowable rotation angle range β Safe rotation angle range

Claims (7)

An internal combustion engine unit (5) rotatably supported on a backrest (1) about a vertical axis (Y) within a predetermined allowable rotation angle range (α), and exhaust of the internal combustion engine unit (5); The safe rotation angle range within the permissible rotation angle range (α) is set so that the rotation angle of the internal combustion engine (5) does not face the worker (16) carrying the backrest (1). (Β) a movable stopper (21, 26) for regulating the inside of the backpack type power working machine. An internal combustion engine unit (5) rotatably supported on a backrest (1) about a vertical axis (Y); and a rotation angle of the internal combustion engine unit (5) within an allowable rotation angle range (α). Fixed stoppers (17, 18), and the internal combustion engine section (5) so that the exhaust of the internal combustion engine section (5) does not face the worker (16) carrying the backrest (1). And a movable stopper (21, 26) for restricting the rotation angle of the motor to a safe rotation angle range (β) within the allowable rotation angle range (α) . An internal combustion engine portion (5) rotatably supported on a backrest (1) about a vertical axis (Y), and an operation extending from the internal combustion engine portion (5) and carrying the backrest (1) A tool (10) used by a worker (16) with its draw-out position appropriately changed, and the internal combustion engine (10) so that the tool (10) does not come into contact with the backrest (1) or the worker (16). Fixed stoppers (17, 18) for restricting the rotation angle of the engine section (5) to within the permissible rotation angle range (α), and the exhaust of the internal combustion engine section (5) is directed toward the worker (16). Movable stoppers (21, 26) for restricting the rotation angle of the internal combustion engine unit (5) within the safe rotation angle range (β) within the allowable rotation angle range (α) so as not to be disturbed. Become a backpack type power working machine. The movable stoppers (21, 26) are constantly urged so as to advance to a rotation restricting position where they come into contact with the locking portions (20, 24) on the side of the internal combustion engine (5). The backpack type power working machine according to claim 1, 2 or 3 , wherein the backrest-type power working machine is configured to be manually operated so as to retreat from a regulation position to a regulation release position which does not abut on the locking portion (20). The movable stoppers (21, 26) are constantly urged so as to advance to a rotation restricting position where they come into contact with the locking portions (20, 24) on the side of the internal combustion engine (5). The operator (16) with the backrest (1) is manually operable so as to retreat from the regulation position to the regulation release position that does not abut on the locking portion (20). A backpack type power working machine according to claim 1, 2 or 3 . When the engaging portions (20, 24) of the internal combustion engine portion (5) enter a rotation restricted range by the movable stopper (21), the engaging portions (20, 24) are pushed by the engaging portions (20, 24) and The backpack type power working machine according to claim 4 or 5 , wherein the movable stopper (21, 26) is forcibly detached from the rotation restricting position. The power carrying machine according to claim 4, 5 or 6 , wherein the movable stopper (26) is configured to be rotatable along a rotation plane of the locking portion (20).

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