JP2007259721A - Bush cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bush cutter so constructed as to be usable as of either double-handedly gripping type or single-handedly gripping type. <P>SOLUTION: The bush cutter has the following construction: The handle grip part 22b of a handle bar 21b is settable so as to cross the position right above a control lever 5, and a spacing of 5-15 cm is formed in between the handle grip part 22b and the control lever 5 when the handle grip part 22b is set at a position above the control lever 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brush cutter used when weeding away weeds and the like, and in particular, has a feature in the shape of the handle and the mounting portion of the handle, both as a two-hand holding type and as a one-hand holding type. The present invention also relates to a brush cutter configured to be usable.

  Conventionally, when mowing weeds and the like, an engine working machine called a brush cutter has been widely used. In general, a brush cutter is provided with a rotary blade at the front end of an operating rod and an engine at the rear end, and the driving force of the engine is supplied to the rotary blade via a drive shaft inserted into the operating rod. It is comprised so that an operator may grasp and operate the handle attached to the operating rod.

  There are several types of handles that are attached to the operating rod of the brush cutter, and there are a type that the operator holds with both hands and a type that the operator holds with one hand. A two-hand grip type handle is usually bent at both ends obliquely upward or curved to form a handle grip portion, and a horizontal portion between them is attached in a direction perpendicular to the operating rod. On the other hand, the one-hand grip type handle is configured such that an arc-shaped or linear one-hand handle grip portion is held at a height of about 5 cm to 15 cm above the operating rod.

  A brush cutter with a two-hand grip handle is an object that the operator grips the right and left grips of the handle and trims them in such a way that the operator points the body in the direction of the rotary blade and projects both arms slightly forward. The operator operates the object (such as weed) by facing the front. This type of brush cutter is suitable for use on a relatively flat place, and it is less by moving forward with the operation rod and the rotary blade at the tip of the operation rod swinging left and right around the center line of the body Mowing can be done efficiently with effort. However, it may be difficult to operate when cutting grass on the slope, or when using it in a place with a lot of undulations or a place with many changes.

When the operator is right-handed, the brush cutter attached with a one-hand grip handle will stand on the left side of the operating rod, hold the one-hand handle grip with the left hand, and Grip the position near the engine with your right hand and operate the object to be trimmed in a half-body posture. In contrast to the two-handed gripping type, this type is suitable for cutting the sloped grass, or for use in places with high undulations or places with a wide variety of changes.
Japanese Utility Model Publication No. 63-129424

  As described above, the two-hand holding type handle and the one-hand holding type handle have advantages and disadvantages. Therefore, when a user intends to purchase a new brush cutter, a brush cutter with a handle of a type suitable for the place of use is appropriately selected. In other words, if you plan to use it mainly on a flat place, you can select a brush cutter with a two-hand grip handle, or use it on a place with a large slope or undulation. If so, a brush cutter attached with a one-handed grip type handle may be selected.

  However, when using on topography that includes both flat and undulating places, if one of the types must be selected, the result is that the other merit is cut off. . Also, if one brush cutter is purchased for each handle type, the economic burden increases.

  The present invention has been made to solve such a problem in the prior art, and provides a brush cutter configured to be used as both a two-handed gripping type and a one-handed gripping type. For the purpose.

  The brush cutter of the present invention has a handle composed of a pair of left and right handle bars, and a mounting portion for mounting the handle to the operating rod, and the mounting portion fixes the mounting portion to the operating rod. And a bracket for fixing the handle, the bracket is configured to be rotatable about a vertical axis with respect to the base portion, and the pair of handle bars are independent from each other Each handlebar is configured to be rotatable about a horizontal axis, and the handlebar grip portion of at least one handlebar of the pair of handlebars can be set so as to cross a position directly above the operating rod. When the handle grip portion is set at an upper position of the operating rod, a configuration in which a space of 5 to 15 cm is formed between the handle grip portion and the operating rod. It is characterized in that it is.

  In addition, when a pair of handlebars is set at the gripping position for both hands, at least one handlebar extends downward from the bracket, and is the shape such that the curved portion is at a lower position than the bracket? Alternatively, it is preferable that the bracket is configured such that the distance from the vertical axis serving as the pivot center of the bracket to the handle is 4 to 12 cm, and the handle grip portion of the handle bar is configured in this way. It is possible to set the handle so as to cross the position directly above the operating rod.

  In addition, when the mounting portion is configured such that a support portion having a predetermined height is interposed between the base portion and the bracket, or when a pair of handlebars are set at the gripping positions for both hands, at least one handle It is preferable that the handle bar is configured so that the grip portion is shifted to the side of the engine unit by 5 to 15 cm from the position directly beside the bracket. By configuring in this way, the handle grip portion can be operated. When set at a position above the heel, the handle can be set in such a state that an interval of 5 to 15 cm is formed between the handle grip portion and the operation heel.

  The brush cutter according to the present invention is configured such that a bracket that is one of components of an attachment portion for attaching a handle to an operating rod is configured to be rotatable about a vertical axis with respect to a base portion. However, the angle of the bracket with respect to the base portion and the angle of the handlebar with respect to the bracket can be freely adjusted. In this way, the handle can be set to the position for gripping with both hands, and can also be set to the position for gripping with one hand.

  Then, when the handle is set to the one-hand gripping position, the handle grip portion of at least one handle bar can cross the position directly above the operating rod. The position of the center of gravity in the direction can be grasped. As a result, the brush cutter can be stably held, and the work can be performed efficiently with a small amount of labor.

  In addition, when it is set to the one-hand gripping position, it is configured such that an interval of 5 to 15 cm is formed between the handle grip portion held at the upper position of the operation rod and the operation rod. A sufficient space for the operator to grip the handle grip portion can be secured between the operator and the operating rod.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of the brush cutter 1 according to the first embodiment of the present invention, and FIG. 2 is a rear view of the handle 2 and the mounting portion 3 in the brush cutter 1 of FIG. 1 (direction of arrow A in FIG. 1). FIG. 4 is a diagram showing the shapes of the handle 2 and the attachment portion 3 that appear when the line of sight is directed toward the head. In FIG. 1, 4 is an engine unit, 5 is an operating rod, and 6 is a rotary blade.

  As shown in FIGS. 1 and 2, in the brush cutter 1, handle grip portions 22 a and 22 b are formed at both ends of the handle 2, respectively. Further, the handle 2 is fixed in a direction orthogonal to the longitudinal direction of the operating rod 5 (direction orthogonal in the plan view of FIG. 1).

  As can be seen from FIG. 2, in the brush cutter 1 of the present embodiment, a handle 2 having a characteristic shape that is not symmetrical on the left side and the right side is attached. More specifically, the shape of both handle bars 21a and 21b, which are the main components of the handle 2, is such that the portions ahead of the curved portions 26a and 26b (including the handle grip portions 22a and 22b) are directed obliquely upward on the outside. Although the left handlebar 21a extends in the horizontal direction from the bracket 9 of the mounting portion 3 to the curved portion 26a, the right handlebar 21b It is different in that it extends downward from the bracket 9 and the curved portion 26b is positioned lower than the bracket 9. (In this embodiment, “left side” means “left side in FIG. 2” unless otherwise specified, and “right side” means “right side in FIG. 2.” is there.)

  The right handle grip portion 22b is longer than the left handle grip portion 22a, and the curved side end 24a of the left handle grip portion 22a is positioned higher than the bracket 9, whereas the right handle grip portion 22b. The curved side end 24b of the grip portion 22b is at a position lower than the bracket 9.

  FIG. 3 is a partially cutaway perspective view of the attachment portion 3 shown in FIGS. 1 and 2. As shown in the drawing, the attachment portion 3 is composed of a base portion 7, a support portion 8, a bracket 9, and a tightening handle 10. (In FIG. 1 and FIG. 2, the tightening handle 10 of FIG. 3 is omitted.)

  The base portion 7 is for fixing the attachment portion 3 to the operation rod 5, and the upper portion 7a and the lower portion 7b sandwich the operation rod 5 from above and below, and tighten the screws to arbitrarily fix the operation rod 5 on the operation rod 5. In this position, the mounting portion 3 can be firmly fixed. A cylindrical support portion 8 protruding vertically is formed above the upper portion 7a. The upper portion 7a of the base portion 7 and the support portion 8 are integrally molded, and the support portion 8 is maintained in a state of protruding onto the base portion 7 with sufficient strength.

  The bracket 9 is for fixing the handle 2 shown in FIGS. 1 and 2, and the upper end 9a and the lower portion 9b sandwich the base end portions of the handle bars 21a and 21b from above and below, respectively. It is designed to be fixed. In addition, large-diameter portions 23a and 23b are respectively formed at the base end portions of the handle bars 21a and 21b as shown in the drawing. These large diameter portions 23a and 23b are adapted to be fitted into fitting grooves formed inside the upper portion 9a and the lower portion 9b of the bracket 9, thereby preventing the handlebars 21a and 21b from falling off. It has come to be.

  The bracket 9 is pivotally connected to the support portion 8 and can be freely rotated about the axis C (vertical axis) of the support portion 8. However, the fastening handle 10 attached above the bracket 9 is configured to be fixed at an arbitrary angular position by turning clockwise and tightening an internal screw (not shown). The tightening by rotating the tightening handle 10 in the clockwise direction is not only for the fixing relationship between the support portion 8 and the bracket 9 but also for the fixing relationship between the bracket 9 and the handle bars 21a and 21b. Works.

  That is, when the tightening handle 10 is rotated by a predetermined amount counterclockwise to loosen the internal screw, the bracket 9 becomes rotatable about the axis C on the support portion 8, and the handlebars 21a, 21b is also rotatable with respect to the bracket 9 about the horizontal axis. Then, when the tightening handle 10 is rotated clockwise to tighten the internal screw, the rotation of the bracket 9 with respect to the support portion 8 is restricted, and the handlebars 21a and 21b with respect to the bracket 9 are similarly fixed. Is also restricted and is in a fixed state.

  The support portion 8 has a height dimension set to 10 (± 5) cm, and is interposed between the base portion 7 and the bracket 9 so that the height is about 10 cm above the upper portion 7 a of the base portion 7. The purpose is to support the bracket 9. The reason will be described later.

  As can be seen from FIG. 3, the two handle bars 21a and 21b are constituted by separate members and are independent of each other. Therefore, when the tightening handle 10 is loosened, Each of them can be independently rotated regardless of the rotation operation.

  In the brush cutter 1 of the present embodiment, since the attachment portion 3 for fixing the handle 2 has the above-described structure, the position and angle of the handle 2 can be freely changed. Further, as described above, the right handle bar 21b and the right handle grip portion 22b have special shapes different from the left handle bar 21a and the left handle grip portion 22a. For this reason, the brush cutter 1 of this embodiment can be used as a two-handed gripping type or as a one-handed gripping type.

  More specifically, in FIG. 1 and FIG. 2, the handle 2 is fixed in a direction orthogonal to the operation rod 5, and both handle grip portions 22 a and 22 b are respectively obliquely outward on the left and right sides of the operation rod 5. The operator stands in a position between the handle 2 and the engine unit 4 (position P shown in FIG. 1), grasps the left handle grip portion 22a with the left hand, and moves the right handle grip. The operation can be performed by holding the part 22b with the right hand and directing the body toward the rotary blade 6. That is, when the handle 2 is set in the state shown in FIGS. 1 and 2, the brush cutter 1 can be used for gripping both hands.

  Then, from the state shown in FIGS. 1 and 2, the fastening handle 10 shown in FIG. 3 is rotated counterclockwise, the internal screw is loosened, and the bracket 9 holding the handle 2 is removed. The right handlebar is rotated 90 ° counterclockwise so that the tip 25b of the right handle grip 22b is on the left side of the operating rod 5 (on the left when looking at the rotary blade 6 from the engine unit 4). 21b is rotated by 90 °, and the left handle bar 21a is rotated so that the front end portion 25a of the left handle grip portion 22a faces downward. In this state, the tightening handle 10 is rotated clockwise to tighten, and the bracket 9 and the handlebars 21a and 21b are fixed.

  4 and FIG. 5, the right-handed operator stands on the left side of the operating rod 5 (position P in FIG. 4), and the handle grip portion 22b is held with the left hand. It is possible to operate the object to be trimmed in a half body posture by gripping and gripping the grip 11 for the rear hand with the right hand at the base part (position close to the engine unit 4) of the operation rod 5. That is, when the handle 2 is set in the state shown in FIGS. 4 and 5, the brush cutter 1 can be used for one-hand gripping.

  In a conventional brush cutter with a two-hand grip type handle attached, the bracket and handle can be rotated about the vertical axis with respect to the base, and the handlebar can be rotated about the horizontal axis with respect to the bracket. Some are configured to be movable, and are configured such that the left and right handlebars rotate independently of each other. However, in the conventional case, the bracket for fixing the handlebar is directly connected to the base portion, and the bracket is not structured to be held at a position higher than 5 cm above the base portion. When rotated to the state shown in FIG. 4 (one-hand grip position), the handle grip portion is in contact with the operating rod, or there is a slight gap between the handle grip portion and the operating rod. However, a sufficient space for the operator to grip the handle grip portion cannot be secured.

  In the present embodiment, as shown in FIG. 3, since the support portion 8 having a height of 10 cm is interposed between the base portion 7 and the bracket 9, the height about 10 cm above the upper portion 7 a of the base portion 7. In this position, the bracket 9 is supported, and as a result, the handle bar 21b is changed from the state shown in FIGS. 1 and 2 (the position for holding both hands) to the one-hand holding position as shown in FIG. Thus, when the handle 2 is rotated 90 ° around the vertical axis and 90 ° around the horizontal axis, the handle grip portion 22b is held at a height of about 10 cm above the operation rod 5, as shown in FIG. Thus, a sufficient space for the operator to grip the right handle grip portion 22b can be ensured with the operation rod 5.

  In the present embodiment, the handle bar 21b and the handle grip portion 22b have a special configuration (more specifically, as shown in FIGS. 1 and 2, the handle 2 is held in the position for holding both hands. , The handle bar 21b extends downward from the vicinity of the attachment portion 3, the bending portion 26b is at a lower position than the attachment portion 3, and the bending end portion 24b of the handle grip portion 22b is also As shown in FIG. 4, when the handle 2 is set to a one-hand gripping position, the curved portion side end 24b of the handle grip portion 22b 5, the handle grip portion 22b crosses the position directly above the operating rod 5. As shown in FIG. Unakatachi (at least the operating rod 5 respectively 5cm from the central axis to the left and right ranges, state as covered by the handle grip portion 22b) becomes.

  If the right handle bar 21b and the handle grip portion 22b shown in FIG. 2 have the same shape as the left handle bar 21a and the left handle grip portion 22a, respectively, the handle 2 is set to a one-hand gripping position. In this case, the entire handle grip portion 22b ′ is located on the left side of the operation rod 5 (left side when viewing the rotary blade 6 from the engine unit 4) (position indicated by a broken line in FIG. 4). In this case, since the handle grip portion 22b ′ is displaced from the center of gravity in the left-right direction of the brush cutter 1, it is difficult to stably hold the brush cutter 1 when the operator grips this portion. An extra burden will be applied.

  On the other hand, in the present embodiment, as described above, when the handle grip portion 22b is set to a position for one-hand gripping, the handle grip portion 22b is formed so as to cross the position directly above the operation rod 5, so that the operator The center of gravity position in the left-right direction of the dispenser 1 can be grasped. Further, in the present embodiment, the angle between the operating rod 5 and the handle grip portions 22a and 22b is set to be within a range of 90 ° ± 15 ° when set to a one-hand gripping position. . As a result, when used as a brush cutter 1 for holding one hand, the handle grip portion 22b can be easily gripped, and the brush cutter 1 can be stably held, and efficiently with less labor. Work can be done.

  It should be noted that if the configuration is such that "the handle grip portion 22b crosses the position directly above the operating rod 5 when set to the one-hand gripping position", the cutting of the present invention is possible. The handle 2 in the dispenser 1 does not necessarily have a shape as shown in FIG.

  For example, as shown in FIG. 6 (plan view of the brush cutter 1 (two-hand gripping position) according to the second embodiment of the present invention), the distance from the axis C serving as the center of rotation to the handle 2 is determined. If the handle bar 21b is configured to extend horizontally from the bracket 9 to reach the curved portion 26b, as shown in FIG. A state in which the handle grip portion 22b crosses the position directly above the operating rod 5 in the one-hand gripping position can be achieved (see FIG. 8).

  In addition, “when the handle grip portion 22b is set to the one-hand grip position, the handle grip portion 22b is held at an upper position of the operation rod 5, and a sufficient space for gripping the handle grip portion 22b is formed between the handle rod portion 22b. As shown in FIG. 3, the attachment portion 3 in the brush cutter 1 of the present invention does not necessarily need to interpose the support portion 8 between the base portion 7 and the bracket 9. It is not necessary to have a structure in which the bracket 9 is supported from the base portion 7 at a predetermined height position.

  For example, as shown in FIG. 10 (plan view of the brush cutter 1 (position for holding both hands) according to the third embodiment of the present invention), when the handle grip portion 22b is set to the position for holding both hands, If the handle bar 21b is configured to be slightly displaced to the engine unit 4 side (offset: 10 (± 5) cm) from the position just beside 9, the mounting portion 3 is as shown in FIG. Even if the base portion 7 and the bracket 9 are directly connected without interposing a support portion between the base portion 7 and the bracket 9, “the handle grip portion 22 b can be And a state in which a sufficient space for gripping the handle grip portion 22b is formed with the operating rod 5 "(see FIG. 13).

1 is a plan view of a brush cutter 1 (a position for gripping both hands) according to a first embodiment of the present invention. The rear view of the handle | steering-wheel 2 and the attaching part 3 in the brush cutter 1 of FIG. FIG. 3 is a partially cutaway perspective view of the attachment portion 3 shown in FIGS. 1 and 2. 1 is a plan view of a brush cutter 1 (one-hand holding position) according to a first embodiment of the present invention. FIG. 5 is a side view of the brush cutter 1 (position for one hand grip) in FIG. 4. The top view of the brush cutter 1 (position for both-hands gripping) which concerns on the 2nd Embodiment of this invention. The rear view of the handle | steering-wheel 2 and the attaching part 3 in the brush cutter 1 of FIG. The top view of the brush cutter 1 (position for one hand holding) which concerns on the 2nd Embodiment of this invention. FIG. 9 is a side view of the brush cutter 1 (one-hand holding position) in FIG. 8. The top view of the brush cutter 1 (position for both-hands gripping) which concerns on the 3rd Embodiment of this invention. The rear view of the handle | steering-wheel 2 and the attaching part 3 in the brush cutter 1 of FIG. The top view of the brush cutter 1 (single-hand holding position) which concerns on the 3rd Embodiment of this invention. FIG. 13 is a side view of the brush cutter 1 (position for holding one hand) in FIG. 12.

Explanation of symbols

1: Brush cutter,
2: Handle,
3: Mounting part,
4: Engine unit
5: Operation rod,
6: Rotary blade,
7: Base part,
7a: upper part,
7b: bottom,
8: support part,
9: Bracket,
9a: upper part,
9b: lower part,
10: Tightening handle,
11: Rear grip,
21a, 21b: handlebar,
22a, 22b: handle grip part,
23a, 23b: large diameter part,
24a, 24b: curved portion side end,
25a, 25b: tip portion,
26a, 26b: curved portion

Claims (5)

It has a handle consisting of a pair of left and right handlebars, and an attachment for attaching the handle to the operating rod.
The mounting portion is composed of a base portion for fixing the mounting portion to the operating rod and a bracket for fixing the handle,
The bracket is configured to be rotatable around a vertical axis with respect to the base portion,
In the brush cutter, wherein the pair of handle bars are configured to be independent of each other and rotatable about a horizontal axis with respect to the bracket,
The handle grip portion of at least one handle bar of the pair of handle bars is configured to be set in a state of crossing a position directly above the operation rod,
A brush cutter, wherein when the handle grip portion is set at an upper position of the operation rod, an interval of 5 to 15 cm is formed between the handle grip portion and the operation rod.   When the pair of handlebars is set at the gripping position for both hands, at least one handlebar extends downward from the bracket, and the curved portion is positioned lower than the bracket. Thus, the brush cutter according to claim 1, wherein the handle grip portion of the handle bar can be set in a state of crossing a position directly above the operation rod.   The bracket is configured such that the distance from the vertical axis that is the pivot center of the bracket to the handle is 4 to 12 cm, whereby the handle grip portion of the handle bar is positioned just above the operating rod. The brush cutter according to claim 1, wherein the brush cutter can be set in a transverse state.   The mounting portion has a structure in which a support portion having a predetermined height is interposed between the base portion and the bracket. With this configuration, when the handle grip portion is set at an upper position of the operating rod, 5 The brush cutter according to claim 1, wherein an interval of -15 cm is formed between the handle grip portion and the operating rod.   When the pair of handlebars is set to the position for gripping both hands, the handlebar is configured so that at least one handle grip portion is shifted to the engine unit side by 5 to 15 cm from the position just beside the bracket. Thus, when the handle grip portion is set at an upper position of the operation rod, an interval of 5 to 15 cm is formed between the handle grip portion and the operation rod. The brush cutter according to claim 1.

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