JPH0625666Y2 - Backpack work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a backpack-type working machine equipped with an internal combustion engine equipped with a manual starter.

2. Description of the Related Art Generally, in a backpack-type working machine such as a backpack-type brush cutter, an internal combustion engine is arranged on a pedestal carried by a worker, and the driving force of the internal combustion engine is transferred to the tip of an operating rod through a flexible transmission shaft or the like. Drive it by transmitting it to a work tool such as a cutting blade device attached to the
Work such as mowing is done. In such a backpack-type working machine, in order to reduce its size, weight and cost, a manual starting device such as a recoil rope type starting device or a power spring accumulation type starting device is used as a starting device for starting an internal combustion engine. Is used. However, the structure of the conventional backpack-type working machine has a disadvantage that it is difficult to start the engine with the gantry on its back.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a backpack type working machine which eliminates the disadvantages of the conventional techniques and has a simple structure and is convenient to use.

Means for Solving the Problems That is, according to the present invention, a backpack-type working machine equipped with an internal combustion engine equipped with a manual starter is configured such that the internal combustion engine is rotatable about a vertical pivot on a backpack mount. A rope guide guide plate extending in the lateral direction is provided on the backpack mount so as to be inclined rearward, and a guide opening is formed in the guide plate in an arcuate lateral direction centered on the pivot axis. The rope guide is slidably supported on the first guide, and the starting guide extending from the manual starting device to the outside is inserted into the guide to support the guide.

Therefore, no matter whether the internal combustion engine moves about the axis in the left or right direction, the rope guides follow it and move together, so that the starter device can be operated anywhere as well.

Embodiment Next, the present invention will be described based on an embodiment of the drawings.

The present embodiment is an example in which the present invention is applied to a backpack type brush cutter,
In this backpack-type brush cutter, as shown in FIG. 1, an internal combustion engine 2 is arranged on a backpack mount 1 which is carried by an operator. The backpack mount 1 is provided at its base portion 3 with a pivot 4 vertically projecting upward, and the pivot 4 is a crankcase 5 of the internal combustion engine 2.
The bottom part of the is pivotally attached so as to be horizontally rotatable. The internal combustion engine 2 has a movable transmission shaft 7 connected to its output end 6 as shown in FIG. 2, and the transmission shaft 7 passes through the inside of an operation rod 8 which is gripped and operated by an operator. Extend the operating rod 8
Is connected to a cutting blade device 9 attached to the tip of the.
During operation, the internal combustion engine 2 transmits its driving force to the cutting blade device 9 via the transmission shaft 7, whereby the cutting blade device 9
It is designed to be able to drive and mow the grass.

The internal combustion engine 2 is provided with a manual starter 10 for starting it. The manual starter 10 has a case 11 attached to the internal combustion engine 2, and the case 11
As shown in FIG. 3, a central shaft 13 which is coaxially arranged with the crank shaft 12 of the internal combustion engine 2 is integrally formed therein. A recoil drum 14 is rotatably supported on the central shaft 13, and the drum 14 is separated from the central shaft 13 in the axial direction by a screw 15 and a washer 16 screwed to an end of the central shaft 13. It is held disabled. The drum 14 integrally has a boss portion 17 extending rearward in the axial direction, and a spiral spring 18 is supported on an outer peripheral surface of the boss portion 17. The mainspring 18 has its inner end fixed to the boss portion 17 of the drum 14, and its outer end fixed to the case 11.

A peripheral groove 19 is formed on the outer peripheral portion of the drum 14, and a recoil starting rope 20 is wound around the peripheral groove 19. The rope 20 has an inner end fixed to the drum 14 at 21 and an outer end from a drawer portion 22 formed in a lower portion of the case 11 of the starting device 10 as shown in FIG. Extending to the outside, the backpack stand 1
The grip 23 is attached to the grip 23 so that it can be grasped by an operator. Accordingly, by pulling the rope 23 out of the case 11 by pulling the grip 23, the drum 14 is rotated in the direction opposite to the operating rotation direction of the crankshaft 12, thereby causing the mainspring to rotate. The spring force can be stored by rotating 18 in the direction of the stored force. Also, the rope 20
Is caused by the drum 14 rotating in the opposite direction when the mainspring 18 releases its accumulated force.
It is rewound inside.

Further, the drum 14 is integrally formed with a ratchet portion 24 at its axially front end portion in the vicinity of the crankshaft 12. On the other hand, the crankshaft 12 has a flange member 25 fixed to an end thereof, and the flange member 25 has a centrifugal pawl 26 pivotally attached to a portion eccentrically outward in the radial direction. The centrifugal pawl 26 is biased by a spring 27 so as to always engage the pawl wheel portion 24, and the pawl wheel portion 2
4 and the centrifugal pawl 26 apply a rotational force in the operating rotational direction of the crank shaft 12 from the drum 14 to the crank shaft 12.
However, the transmission of the rotational force in the opposite direction is blocked.

The platform portion 3 of the backpack mount 1 has a rope guide guide plate 28 extending in the lateral direction, which is attached to the front portion near the back of the operator while tilting backward. As shown in FIG. 4, the rope guide guide plate 28 has an elongated guide opening 29 extending in an arcuate direction centered on the pivot 4, and a rope guide 30 such as bakelite is formed in the guide opening 29. It is fitted so that it can slide laterally. The rope guide 30
As shown in FIG. 5, a hole 31 is formed in the center of the hole, and the recoil starter rope 20 is inserted and guided in the hole 31. Further, the rope guide 30
Has a circumferential groove 32 formed in its outer peripheral portion. This circumferential groove 3
2 engages with both edges of the guide opening 29 of the rope guide guide plate 28, whereby the rope guide 30 cannot be detached from the rope guide guide plate 28, and along the guide opening 29. Hold it so that it can move laterally.

It should be noted that if the starting rope 20 is kept protruding from the rope guide 30 downward by about 20 cm, a knot is formed on the rope so that the rope 20 can be locked on the lower surface of the rope guide 30. This is preferable because it is easy to operate.

As described above, the crankcase 5 of the internal combustion engine 2 is pivotally attached to the pivot 4 of the base portion 3 of the backpack mount 1, so that the manual starter 10 operates according to the orientation of the internal combustion engine 2 to the fourth position. A lateral position can be occupied between the positions A and B shown in the figure, and the rope guide 30 also follows the arcuate guide opening 29 of the rope guide plate 28 and moves accordingly.

When the rope guide guide plate 28 is inclined and provided as in the present embodiment, when the rope guide 30 moves from one side of the guide opening 29 and passes through the central portion of the guide opening 29, the rope guide 30 descends and the movement is reduced. Certainly.

When the internal combustion engine 2 is started, the worker keeps the backpack 1 on his back, and at that time, with the hand closer to the lateral position occupied by the starter 10, the position immediately below the rope guide 30 (see the solid line in FIG. 1). Grip 2 of the starting rope 20 in the position indicated by
Pull 3 downwards gently to the position shown by the chain line in FIG. For this reason, the recoil starting rope 20 is attached to the rope guide 3
Guided by 0, it is pulled out from the case 11 of the starting device 10 to rotate the recoil drum 14 and store the power in the spring 18. Next, when the hand is released from the grip 23, the drum 14
The mainspring 18 is rotated in the opposite direction by releasing its accumulated force to rewind the rope 20 to the circumferential groove 19, and at the same time, the rotational force is applied to the crank of the internal combustion engine 2 via the ratchet portion 24 and the centrifugal pawl 26. The internal combustion engine 2 can be started by transmitting it to the shaft 12 and driving the crankshaft 12 in the operating rotation direction.
When the internal combustion engine 2 starts and its speed increases, the centrifugal pawl 2
6 is pivoted by the action of the centrifugal force against the spring force of the spring 27 and is separated from the ratchet wheel 24, so that the starting device 10 maintains its original state in a stationary state. As described above, the starting device 10 of this embodiment is a power-saving spring-power-release type starting device that starts the internal combustion engine 2 with the power stored in the mainspring when the rope 20 is released. You don't have to pull it quickly, and the force to pull the rope is small,
There is an advantage that so-called cuttin does not occur and the engine can be easily started even by women and girls and the elderly.

Advantageous Effects of Invention With the configuration of the present invention described above, the present invention can easily start the internal combustion engine with the backrest mounted on the back, regardless of whether the internal combustion engine is located in the left or right direction. It is possible to provide a backpack-type working machine that has a simple structure, is lightweight, and is convenient to use.

[Brief description of drawings]

FIG. 1 is a side view of an essential part showing an embodiment in which the present invention is applied to a backpack-type brush cutter, FIG. 2 is an overall schematic view of FIG. 1, and FIG. 3 is a sectional view of the starting device of FIG. FIG. 4 is a plan view of an essential part of FIG. 1, and FIG. 5 is a sectional view of the rope guide of FIG. 1 ... Stand, 2 ... Internal combustion engine, 4 ... Axis, 10 ... Manual starter, 20 ... Recoil starter rope, 28 ... Rope guide guide plate, 29 ... Rope guide guide plate opening, 30 ...... Rope guide.

Claims (2)

[Scope of utility model registration request] 1. A backpack-type working machine equipped with an internal combustion engine equipped with a manual starter, wherein the internal combustion engine (2) is rotatably mounted on a backpack mount (1) around a vertical pivot (4). , A rope guide guide plate (28) extending in a lateral direction is provided on the backpack frame so as to be inclined rearward, and a guide opening (29) extending in a circular direction centering on the pivot is formed in the guide plate. The rope guide (30) in the guide opening.
Is slidably supported, and a starting rope (20) extending from the manual starting device (10) to the outside is inserted into the rope guide for guiding and supporting. 2. The backpack-type working machine according to claim 1, wherein the manual starting device is a spring power storage / release starting device.