JP2011067097A - Bush cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bush cutter preventing a starting switch from being operated carelessly by the contact with a plant or the like, by a simple structure. <P>SOLUTION: The bush cutter 10 equipped with the starting switch 30 provided at a handle-gripping portion 19 of an operation arm 16 is constituted so that the handle-gripping portion 19 may surround the whole circumference of a lever 31 on a nearly flat plane on which the lever 31 constituting the starting switch 30 acts. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a brush cutter in which a start switch is provided in a handle grip portion of an operation arm so that the start switch does not act on a plant or the like inadvertently.

  2. Description of the Related Art Conventionally, a brush cutter is known as an apparatus used for cutting grass such as turf and weed. FIG. 3 shows an electric brush cutter disclosed in Patent Document 1. A right hand grip 300 and a left hand grip 260 are provided at both ends of a handle (operation arm) 220. The right hand grip 300 has an activation switch 380 and a right hand grip. The left hand grip switch 260 is provided with a left hand grip switch 280. An operator who cuts grass using this electric brush cutter puts a belt (not shown) attached to the hanger 200 on his shoulder and grips the left and right grips 260 and 300 with both hands to perform the grass cutting operation.

JP 2008-271830 A

  However, in the above configuration, since there is nothing to protect the start switch 380, there is a possibility that an unexpected situation may occur in which the start switch 380 is activated by touching a plant or the like by an inadvertent operation. In the above prior art, in order to avoid such an unexpected situation, the left hand grip switch 280 and the right hand grip switch 320 are provided, and the motor is not driven unless all these switches are turned on. However, providing such a large number of switches is undesirable in terms of cost, operation, and maintenance.

  The present invention solves the above-described problems, and provides a brush cutter that has a simple configuration and prevents a start switch from being inadvertently in contact with plants or the like.

  In order to achieve the above object, in a brush cutter provided with an activation switch in the handle gripping portion of the operating arm, the handle gripping portion has an entire circumference around the lever on a substantially plane on which the lever constituting the activation switch operates. The surrounding structure was adopted.

  According to the present invention, because of the above-described configuration, it is possible to provide a brush cutter in which the start switch does not operate inadvertently in contact with plants or the like.

It is an external appearance top view for demonstrating the whole structure of the brush cutter concerning this invention. It is sectional drawing of a handle holding part. It is a perspective view of the conventional electric brush cutter.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings.

  In the following description, for convenience of explanation, a direction corresponding to the usage state of the brush cutter 10 is defined. That is, as shown in FIG. 1, the side on which the cutting blade 13 is installed is “front”, the housing 20 side is “rear”, the lower side in FIG. 1 is “left”, and the upper side in FIG. It will be called “right”.

  The brush cutter 10 according to the present embodiment includes an operating rod 11 formed in a shaft shape extending in the longitudinal direction, a cutting blade 13 installed on the front side that is one end side of the operating rod 11, and other than the operating rod 11. The housing 20 is provided on the rear side, which is the end side, and includes a motor (not shown) as a drive source therein, and an operation arm 16 installed in the middle portion of the operation rod 11 in the longitudinal direction.

  The operation rod 11 is constituted by a hollow rod-like pipe member, and a driven shaft (not shown) is housed in a rotatable state therein. A holder 14 is attached to the front end of the operation rod 11, and a disk-shaped metal cutting blade 13 having a plurality of saw blade-shaped blade portions formed on the outer peripheral surface thereof is freely rotatable. Is attached. The cutting blade 13 is connected to the front end of the driven shaft via a pair of bevel gears (not shown) installed in the holder 14, and rotates according to the rotational movement of the driven shaft to cut grass and the like. Can be implemented. In addition, a protective cover 15 is provided in the immediate vicinity of the back of the cutting blade 13 so as to cover a part of the cutting blade 13, thereby preventing the scattered matter generated at the time of cutting from being scattered to the rear. Safety is ensured. In addition, about the cutting blade 13, instead of the disk-shaped metal thing shown in figure, the cutting blades of all types, such as the thing made from ceramics, and the thing which consists of a several string extended radially from a rotation center, are used. It is possible to adopt.

  An operation arm 16 including a pair of left and right handle gripping portions 18 and 19 is attached to an intermediate portion in the longitudinal direction of the operation rod 11. As will be described later, a start switch 30, an overload stop circuit 33, and the like are disposed in the handle gripping portion 19, and a wiring cord 35 from these switches and circuits is wired to control the motor in the housing 20. Reference numeral 17 denotes a hook portion to which a shoulder belt (not shown) can be attached.

  FIG. 2 is a cross-sectional view of the handle gripping portion 19, and the handle gripping portion 19 has a D-shape when viewed from the side. The handle gripping portion 19 is formed by superimposing halved members formed of resin or the like, and is attached to the tip of an operation arm 16 usually made of metal with a bolt or the like (not shown). The handle gripping part 19 is composed of a grip 19a gripped by an operator and a protection part 19b that protects the activation switch 30 from inadvertent contact with plants and the like. Alternatively, a separate member may be assembled with a bolt or the like. The start switch 30 is composed of a lever 31 and a micro switch 32 in this example. The microswitch 32 can be turned on and off by the operator holding and releasing the lever 31, and wiring is performed so that the current to the motor is turned on and off when the microswitch 32 is turned on and off. A lever 31 constituting the activation switch 30 is provided in a D-shaped central hole formed by the grip 19a and the protection portion 19b, and the lever 31 is gripped on a substantially plane on which the lever 31 operates. 19a and the protection part 19b surround the entire circumference. The lever 31 is rotatable about a shaft 31b, and is urged by a spring 31c and is normally in a position indicated by a solid line, that is, a position protruding in a D-shaped central hole. When the operator operates the lever 31 while gripping the grip 19a, the position of the lever 31 is rotated to the position indicated by the two-dot chain line, and the tip 31a presses the actuator of the microswitch 32 so that the microswitch 32 is activated. It is configured. Reference numeral 33 denotes a lock button, which restricts the movement of the lever 31 so that the operator does not operate the lever 31 by mistake. The restriction can be released by pushing the lever 31 with a finger.

  If the cutting blade 13 bites many leaves during the mowing operation and cannot rotate, the motor is overloaded. Reference numeral 34 denotes an overload stop circuit that cuts off the current so that the motor is not burned by an excessive current during overload, and is constituted by a circuit protector here. The overload stop circuit 34 is provided with a release button 34a for releasing the stop state so that the current flows again.

  When performing the mowing operation with the brush cutter 10 configured as described above, the operator hangs a shoulder belt (not shown) attached to the hook portion 17 around the shoulder and a pair of left and right handles provided in the operation arm 16. By grasping the grip portions 18 and 19 with both hands, the brush cutter 10 can be freely operated.

  Next, the motor is started and the cutting blade 13 is rotated. For this purpose, the operator presses the lock button 33 with the finger of the right hand and simultaneously grips the grip 19a and the lever 31 of the handle grip portion 19 with the right hand. Good. The lever 31 moves to the position of the two-dot chain line against the urging force of the spring 31c by the gripping force of the operator, and the tip 31a of the lever 31 pushes the actuator of the microswitch 32. Start spinning. When the operator wants to interrupt the mowing operation, the right hand is loosened and the lever 31 is returned to the solid line position.

  When the cutting blade 13 bites a lot of grass during the mowing operation, the overload stop circuit 34 is activated to cut off the current to the motor and stop the cutting blade 13 from rotating. When an operator wants to remove the biting of the grass and start the mowing operation again, the operator may press the release button 34a to release the operation of the overload stop circuit 34. Conventionally, the operability is poor because the release button is located near the motor, but the operability is good because the release button 34a of the present invention is attached to the handle grip portion 19.

  The brush cutter according to the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, in the present embodiment, a brush cutter using a motor as a drive source has been described, but a brush cutter using an engine may be used.

  The present invention is useful for a brush cutter.

  DESCRIPTION OF SYMBOLS 10 Brush cutter, 11 Operating rod, 13 Cutting blade, 16 Operating arm, 18, 19 Handle gripping part, 19a Grip, 19b Protection part, 20 Housing, 23 Power cord, 30 Start switch, 31 Lever, 34 Overload stop circuit, 34a Release button, 35 Wiring cord

Claims (2)

  A brush cutter provided with an activation switch in a handle gripping portion of an operating arm, wherein the handle gripping portion surrounds the entire circumference of the lever on a substantially plane on which a lever constituting the activation switch operates. Brush cutter.   2. The brush cutter according to claim 1, wherein a release button for releasing the current stop by the overload stop circuit is provided on the handle gripping portion.

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