JPH0410730Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention provides a bearing body that rotatably supports a rotary blade and an engine connected by a tubular connecting rod, and the engine is This invention relates to a brush cutter that is installed to be started by a starting motor that uses a battery as a power source.

(b) Prior art and problems to be solved Conventionally, in this type of brush cutter, the battery for power supply for driving the starting motor was fixed to the engine together with the starting motor, so it was not necessary to carry it on the shoulder. The center of gravity of the entire brush cutter suspended by the band moves backwards, causing the rotary blade to rise up, making it difficult to work, and putting an unbalanced force on the hand of the worker who grips the handle, which can lead to fatigue. It was the cause.

(c) Means and action for solving the problem The present invention provides a battery for power supply by fixing the mounting position of the battery to the connecting rod in front of the hanging position of the shoulder strap so as to be adjustable. The rotary blade is fixed at an appropriate position such as the center of gravity of the brush cutter to eliminate lifting of the rotary blade, making work easier and reducing operator fatigue.

(d) Embodiment Hereinafter, an embodiment of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a brush cutter equipped with the device of the present invention, in which a bearing body 3 that pivotally supports a rotary blade 1 and an engine 5 are connected by a tubular connecting rod 7, and a transmission shaft 8 is connected inside. is penetrated. A buffer body 9 is attached to the connecting rod 7.
A handle 11 is fixed thereto, and grips 13, 13 are provided at both ends of the handle 11. A lower end of a shoulder strap 17 is secured to a bracket 15 provided at the front of the engine 5. By fixing a fixing fitting 23 to a case 21 that accommodates the battery 19 with a screw 25, the battery 19 is fixed to the connecting rod 7 so that its mounting position can be freely adjusted in front of the hanging position of the malt shoulder band 17. ing. The engine 5 is constructed as follows. That is, in FIGS. 2 and 3, a crankshaft 35 is rotatably supported in the crankcase 31 via a bearing 33, and the crankshaft 35 is connected to the crank arm 37 via a crank pin 39 via a connecting rod 41. One end is pivoted. The other end of the connecting rod 41 is connected to a piston (not shown) that is fitted into a cylinder 43 fixed to the upper part of the crankcase 31 so as to be able to slide back and forth. A fuel tank 45 is fixed to the lower part of the crankcase 31. At one end of the crankshaft 35, a driven gear 51, which is held between washers 47 and 49 with a gap, is connected to a non-return type clutch 5.
3, and is positioned and locked by a nut 55. The non-return clutch 53 is a cylindrical case 5 that is press-fitted into the inner diameter hole of the driven gear 51.
A plurality of rollers 57 are held at predetermined intervals within the cylindrical case 56 by retaining rings 59, 59, and the crankshaft 35 is held relative to the inclined surface 63 on one side of the protruding piece 61 protruding from the inner diameter surface of the cylindrical case 56. When the target rotates,
The roller 57 rides on the inclined surface 63 and is driven between the crankshaft 35 and the cylindrical case 56, thereby locking the relative movement. When rotated in the opposite direction, the roller 57 separates from the inclined surface 63 and rotates freely. Bearing rollers 63 and 65 are mounted on a cylindrical case 56 on the outside of both ends of the roller 57.
The crankshaft 35 is fitted into the circular inner diameter surface portion of the crankshaft 35 to support the crankshaft 35. Flange portion 6 of crankcase 31
A gear case 69 that covers the driven gear 51 is fixed to the gear case 7, and a drive gear 75 is fixed to the rotating shaft 73 of a starter motor 71 fixed to the gear case 69, and is always in mesh with the driven gear 51.

In the above configuration, when the starter motor 71 is driven, the driven gear 51 rotates via the drive gear 75, and the cylindrical case 56 of the clutch 53 rotates in the direction of arrow A in FIG. The roller 57 contacts the outer periphery of the crankshaft 35 which rotates in a relatively opposite direction, rolls along the inclined surface 63, and is pressed and held between the inclined surface 63 and the crankshaft 35, and the crankshaft 35 is rotated by the roller. The engine 29 rotates together with the driven gear 51 via the gear 57 and starts. When the engine 29 starts, the rotational speed of the crankshaft 35 becomes faster than the rotational speed of the driven gear 51, and the cylindrical case 56 rotates in the direction opposite to the arrow A relative to the crankshaft 35. roller 5
7 becomes free by separating from the inclined surface 63, and when the starter motor 71 is stopped, the driven gear 51 is stopped and only the crankshaft 35 rotates.

The worker wears the shoulder band 17 on his shoulder, grasps the grips 13, 13 with both hands, and uses the rotary blade 1 to cut grass, etc. on the ground. If the battery 19 is adjusted and fixed at an appropriate position such as the center of gravity of the brush cutter, imbalance due to the weight of the battery can be eliminated.

(e) Effect of the invention This invention has the structure as described in the claims. The battery for powering the starting motor can be adjusted and fixed to the shoulder band of the connecting rod at an appropriate position in front of the hanging position, and the weight can be balanced to facilitate mowing work.

In addition, in the present invention, the battery may be provided integrally with the handle so that its attachment position to the connecting rod can be freely adjusted together with the handle.

[Brief explanation of the drawing]

Fig. 1 is a perspective explanatory view of one embodiment of the present invention;
3 is a front sectional view of the clutch portion, and FIG. 4 is a front sectional view of the battery portion. DESCRIPTION OF SYMBOLS 1... Rotating blade, 3... Bearing body, 5... Engine, 7... Connecting rod, 17... Shoulder band, 19...
...Battery, 35...Crankshaft, 71...Starting motor.

Claims (1)

[Scope of utility model registration request] A bearing body 3 rotatably supported on the rotary blade 1 and an engine 5 provided at the rear are connected by a tubular connecting rod 7, and suspended by a shoulder band 17 at an appropriate position of the connecting rod 7. In this brush cutter, a starting motor 71 that is interlocked in one direction with the crankshaft 35 of the engine 5 is attached to the engine 5, and a battery 19 for powering the starting motor 71 is attached to the suspension of the shoulder band 17. A brush cutter characterized in that the attachment position is fixed to the connecting rod 7 in front of the hanging position so as to be adjustable.