JP5144586B2 - Engine throttle adjustment device for brush cutter - Google Patents

Description

  The present invention relates to an engine throttle adjustment device for a brush cutter or the like, and more specifically, an internal combustion engine such as an engine is mounted on one end side of a handle pipe and a drive shaft disposed inside the handle pipe on the other end side. In a throttle device for adjusting the rotation of an engine or the like in a brush cutter provided with a rotary blade driven by an internal combustion engine such as an engine, the rotation speed of the engine or the like is controlled especially by being arranged near the grip portion of the handle pipe The present invention relates to an improvement of a throttle adjustment lever device.

  In a brush cutter equipped with an engine driven by gasoline or the like and driving the rotary blade provided at the tip of the handle pipe through the centrifugal clutch mechanism, the engine output is It is necessary to control the output (rotation) of the engine every time it is stopped or when a work is subjected to a work load, or every idling when the work is temporarily interrupted. Generally, a throttle lever is arranged in the vicinity of the grip of the handle pipe, and the throttle is operated by a finger of a hand holding the grip portion to operate the throttle to adjust the engine to a predetermined output. The method is taken.

As a conventional throttle adjusting lever device, for example, a throttle lever device in an engine described in Patent Document 1 is known. FIG. 8 exemplifies the outline of the configuration of the throttle lever device. The first throttle control lever 31 interlocked with the throttle of the engine via the throttle control control wire 30 and the throttle control lever can be rotated. Adjacent to the throttle control lever 31 so as to support the case 34, elastic means such as a leaf spring interposed between the throttle control lever and the cover, and to restrict the operation in the rotational direction and operate in the axial direction. The cam mechanism and the case 34 can be rotated coaxially with the first throttle control lever so as to be clamped between the cam mechanism and the elastic means such as the leaf spring. And a lock lever for locking the second throttle control lever through elastic means such as the leaf spring. 33, and when the return elastic force applied to the second throttle control lever 32 acts on the lock lever 33, the engagement of the first and second throttle control levers 31, 32 is maintained. The second throttle control lever 32 and the lock lever 33 are provided with a return elastic mechanism so as to release both throttle control levers when the return elastic force to the lock lever 33 is removed. . Reference numeral 35 denotes a handle pipe.
That is, the throttle lever device is attached to the first throttle control lever 31 through a resilient means such as a leaf spring between the first throttle control lever 31 and a case that rotatably supports the lever. By gripping, a frictional resistance is applied between the case and the first throttle control lever 31 can be held at an arbitrary adjustment position, and the second throttle control lever 32 is held by the lock lever 33. In this state, the first throttle control lever 31 can be operated with the second throttle control lever 32 opened, and the engine output can be maintained in an arbitrary state. If the second throttle control lever 32 is gripped by the lock lever 33 and then the throttle control lever is further gripped, the second throttle control lever 32 is locked. Bar is released, in which the first throttle control lever is no a mechanism which rotates the idling rotational direction.

  According to this conventional throttle lever device, the throttle adjustment can be easily performed by the first throttle control lever, and the adjustment position of the first throttle control lever can be stabilized by the simple pressure applied to the second throttle control lever. Even if the pressure applied to the second throttle control lever by the lock lever is removed, the control adjustment position of the first throttle control lever can be maintained, so that it is not necessary to apply an operating force for a long time. When the second throttle control lever is operated again, the lock with the lock lever is automatically released, so that the first throttle control lever can be automatically returned to the throttle fully closed direction. For this reason, not only can the intermediate control state of the throttle opening be maintained easily and stably, but in the event of an emergency, it has an excellent function of being able to automatically control the throttle in the fully closed direction by releasing the control force.

Japanese Utility Model Publication No. 56-24286

However, the above-described conventional throttle lever device has the following problems.
That is, when the throttle control lever is accidentally touched and accidentally operated during normal operation, the throttle control lever rotates and the engine output is increased, so that the handle is connected via the centrifugal clutch mechanism. There is a risk that the rotary blade provided at the tip of the pipe will be driven to injure the human body, and the first throttle control lever may be arbitrarily adjusted with the first throttle control lever held by the lock lever. In this mechanism, the hand and the finger that perform the adjustment operation may be separated from the operation portion of the first throttle control lever or the second throttle control lever in order to firmly hold the brush cutter during the operation. Therefore, in order to set the engine output to the idling state in an emergency, it is necessary to re-grip the grip and operate it. Can not be returned Jin output idling, there is a problem.
The present invention has been made to solve such a problem, and even if the first throttle control lever is inadvertently contacted during normal load operation and the turning force is accidentally applied to the throttle control lever, the lever Therefore, it is an object of the present invention to provide a throttle adjustment device that does not rotate to increase the engine output, and can quickly return the engine rotation to an idling state in an emergency.

An engine throttle adjusting apparatus for a brush cutter according to the present invention includes a throttle control lever for operating the other end of a throttle control control wire, one end of which is connected to a throttle of an engine mounted on the brush cutter. a regulating device, a throttle control lever operating portion connecting the other end of the throttle control for the control wires are provided, separately from the said throttle control lever, usually the throttle control lever and engages the throttle control at the time of Lock levers that lock the lever in the non-operation position are pivotally supported on the case, respectively, and are coaxial with the throttle control lever and hold the rotation operation of the throttle control lever at a predetermined position. Means, and the lock lever is different from the holding means in a normal state. Was placed et rotated, the throttle adjusting apparatus of an engine in a bush cutter, which is configured as the holding means is operated, the throttle control lever is provided with a manipulation unit, a first engaging portion formed on an outer peripheral portion The lock lever includes an operation portion, and an engagement claw that engages with the engagement portion of the first stopper and locks the throttle control lever in a non-operation position during normal operation is formed. Means for holding the throttle control lever in a predetermined position, and a friction plate attached coaxially to the throttle control lever. Are attached integrally with the lock lever and are rotated together with the lock lever toward the friction plate to rotate the friction plate. It is characterized in that and a third stopper for regulating the.
Further , it is preferable that the friction plate is a disc having a tooth shape on the outer periphery, and the third stopper is a lever shape formed so that a tip of the third stopper meshes with the outer periphery of the friction plate. It is.

  The throttle adjusting device according to the present invention, in addition to the throttle control lever provided with an operating portion for connecting the other end of the control wire for throttle control, and the throttle control lever are normally engaged with the throttle control lever. Lock levers that lock the control lever in the non-operating position are pivotally supported on the case, respectively, and are coaxial with the throttle control lever so that the rotation operation of the throttle control lever is held at a predetermined position. The lock lever having a support shaft different from that of the holding means is configured to rotate from a normal position so that the holding means is operated. As a specific configuration, the throttle control lever Has a first stopper having an engaging portion formed on the outer periphery, and the lock lever has an operating portion. And a second stopper formed with an engaging claw that engages with the engaging portion of the first stopper and locks the throttle control lever in the non-operating position at a normal time. The means for energizing the power and holding the rotation operation of the throttle control lever at a predetermined position includes a friction plate attached coaxially with the throttle control lever, and an integral attachment coaxially with the lock lever. And a third stopper that rotates together with the lock lever toward the friction plate side and restricts the rotation of the friction plate, so that the throttle control lever can be inadvertently contacted during a normal load operation. Even if turning force is accidentally applied to the throttle control lever, its operation can be prevented, so the engine output does not increase and the throttle is The control lever can be locked in the non-operating position, and at the same time, during load work, the throttle control lever is held by the lock lever that is gripped and operated together with the handle pipe. When this occurs, releasing the lock lever releases the holding of the throttle control lever, and the throttle control lever returns instantaneously to the idling position so that the engine can be in an idling state and the rotary blade can be stopped.

It is a right view which shows the throttle adjustment apparatus which concerns on one Example of this invention. It is a left view which shows a throttle adjustment apparatus same as the above. It is a longitudinal cross-sectional view on the AA line of FIG. It is a right view which shows the engagement state of the stopper of the throttle control lever of the throttle adjusting device same as the above, and a lock lever. It is a right view which shows the state which the engagement of the stopper of the throttle control lever of the throttle adjusting device same as the above, and the lock lever were cancelled | released. It is a right view which shows the state which the friction plate and throttle control lever holding | maintenance stopper of a throttle adjusting device same as the above do not contact. It is a right view which shows the state which the friction plate and throttle control lever holding stopper of the throttle adjusting device same as the above contacted. It is a side view which shows an example of the conventional throttle adjustment lever apparatus.

  As shown in FIGS. 1 to 7, the throttle adjusting device according to the present invention is integrated with a handle pipe 1 forming a grip portion for gripping a brush cutter from both sides. It has cases 2-1 and 2-2 that are divided into two so as to be assembled, and a substantially L-shaped throttle control lever 3 provided with an operation section 3-1 is arranged outside the case 2-1. In the cases 2-1 and 2-2, there is provided an operation part 4-1 for connecting the other end of the throttle control control wire 13 having one end connected to a throttle of an engine (not shown). In addition, a substantially disc-shaped first stopper 4 formed with an engaging portion 4-2 for locking the throttle control lever 3 in the non-operation position is disposed. The throttle control lever 3 and the first stopper 4 are Use the fastening bolt 5 to 2-1 are integrally assembled (FIG. 3, FIG. 4). The throttle control lever 3 and the first stopper 4 are always urged counterclockwise by the pulling force of the throttle control control wire 13, and the first stopper 4 is connected to the throttle control lever 3. The friction plates 11 (FIGS. 6 and 7) for holding the pivoting operation at a predetermined position are overlapped with a nut 7 via a leaf spring 6 (FIG. 3). ).

  The case 2-1 includes a second stopper provided with an operation portion 8-1 disposed outside the case and formed with an engaging claw 8-3 for locking the throttle control lever 3 in a non-operation position. A lock lever 8 having 8-2 and constantly being urged by a spring 9 in the clockwise direction is rotatably arranged. The lock lever 8 has an action for holding or releasing the rotation operation of the throttle control lever 3, and is provided at the end of the case 2-1 in parallel with the fastening bolt 5 of the throttle control lever 3. The shaft 10 is rotatably attached so as to be always urged by a spring 9 in the clockwise direction.

  Further, on the shaft body 10 to which the lock lever 8 is attached, the fastening bolt 5 to which the throttle control lever 3 and the first stopper 4 are attached overlaps with the second stopper 8-2. A throttle control lever holding stopper 12 (hereinafter referred to as a third stopper 12), which is a third stopper having an engaging claw 12-1 that engages with a friction plate 11 that is rotatably attached to the lock plate, is a lock lever. 8 and the third stopper 12 is engaged with the friction plate 11, so that the throttle control lever 3 can be rotated by a frictional resistance between the friction plate 11 and the leaf spring 6. The mechanism is held at the position. Reference numeral 14 denotes an engine stop switch for stopping the engine.

  In the throttle adjusting device having the above-described configuration, the engaging claw 8-3 formed at the tip of the second stopper 8-2 of the lock lever 8 is normally formed in the first stopper 4 as shown in FIG. Thus, the throttle control lever 3 is locked in the non-operating position. In this state, the engine is maintained in the idling rotation state and is attached to the tip of the handle pipe 1. The attached rotary blade (not shown) is prevented from rotating. That is, since the throttle control lever 3 is locked by the lock lever 8 so as not to rotate, it is prevented that the throttle control lever 3 is mistakenly operated and the rotation of the engine is increased to operate the rotary blade. ing.

  Next, as shown in FIG. 5, the operation portion 8-1 of the lock lever 8 is gripped by a hand holding the handle pipe 1 to start work, and the lock lever 8 is counterclockwise against the spring 9. The engaging claw 8-3 formed at the tip of the second stopper 8-2 of the lock lever 8 is formed on the first stopper 4 when it is operated so as to be rotated along the handle pipe 1. As shown in FIG. 7, the engaging claw 12-1 of the third stopper 12 and the friction plate 11 are engaged with each other as shown in FIG. An arbitrary engine output is maintained by holding the rotation operation of the throttle control lever 3 at a predetermined position by the frictional resistance between the friction plate 11 and the leaf spring 6. In this state, the rotation state suitable for the normal work is maintained, and the normal work can be performed with the finger released from the operation unit 3-1 of the throttle control lever 3. In an emergency, the lock lever 8 is operated clockwise by the rotational biasing force of the spring 9 by opening the operation portion 8-1 of the lock lever 8 operated by the hand holding the handle pipe 1. The engagement is released when the engagement claw 12-1 of the third stopper 12 is turned away from the friction plate 11, and the throttle control lever 3 is pulled by the control wire for throttle control. The engine is rotated counterclockwise by the force to instantly bring the engine into an idling state (FIG. 6). At the same time, the engaging claw 8-3 formed at the tip of the second stopper 8-2 of the lock lever 8 engages with the engaging portion 4-2 formed on the first stopper 4, and the throttle control lever 3 Is locked in the non-operating position (FIG. 4).

  The throttle adjusting device according to the present invention, in addition to the throttle control lever provided with an operating portion for connecting the other end of the control wire for throttle control, and the throttle control lever are normally engaged with the throttle control lever. Lock levers that lock the control lever in the non-operating position are pivotally supported on the case, respectively, and are coaxial with the throttle control lever so that the rotation operation of the throttle control lever is held at a predetermined position. The lock lever having a support shaft different from the holding means is configured to rotate from the normal position so that the holding means operates. Even if the control lever is inadvertently touched and the turning force is accidentally applied to the throttle control lever, its operation can be prevented. Therefore, the throttle control lever can be locked in the non-operating position without increasing the engine output. At the same time, the throttle control lever is a lock lever that is gripped and operated together with the handle pipe during load work. If the emergency situation occurs, the throttle control lever is released by releasing the lock lever, and the throttle control lever instantaneously returns to the idling position to rotate the engine to idling. Since it has excellent effects such as being able to stop the blade, it is extremely safe and practical.

DESCRIPTION OF SYMBOLS 1 Handle pipe 2-1, 2-2 Case 3 Throttle control lever 3-1 Operation part 4 1st stopper 4-1 Actuation part 4-2 Engagement part 5 Fastening bolt 6 Leaf spring 7 Nut 8 Lock lever 8 -1 Operation section 8-2 Second stopper 8-3 Engaging claw 9 Spring 10 Shaft body 11 Friction plate 12 (Throttle control lever holding stopper) Third stopper 12-1 Engaging claw 13 Throttle control control wire 14 Engine stop switch

Claims (2)

One end a throttle adjusting apparatus provided with a throttle control lever for operating the other end portion of the throttle control for the control wire connected to the throttle of an engine mounted on the brush cutter, the other of the throttle control for the control wires In addition to the throttle control lever provided with an operating part for connecting the ends, and a lock lever for engaging the throttle control lever and locking the throttle control lever in a non-operating position in a normal state separately from the throttle control lever, And a means for holding the turning operation of the throttle control lever at a predetermined position coaxially with the throttle control lever. The support shaft is different from the holding means. is rotated from the normal position when the lock lever, cutting payment that said holding means is configured to operate In the throttle adjusting apparatus of an engine in the together with the throttle control lever is provided with an operating unit, having a first stopper engaging portion is formed on an outer peripheral portion, together with the locking lever comprises an operating portion, during normal A second stopper formed with an engaging claw that engages with the engaging portion of the first stopper and locks the throttle control lever in the non-operation position, and is energized with a rotational force in a certain direction; The means for holding the rotation operation of the throttle control lever at a predetermined position includes a friction plate attached coaxially with the throttle control lever, and integrally attached coaxially with the lock lever and on the friction plate side. cutting said rotated with the lock lever, characterized in that it is constituted by a third stopper for restricting the rotation of the friction plate Throttling device for the engine in the machine. 2. The brush cutter according to claim 1 , wherein the friction plate is formed of a disk having a tooth shape on an outer periphery, and the third stopper is formed of a lever shape formed so that a tip of the third stopper meshes with the outer periphery of the friction plate. Engine throttle adjustment device.

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