JPH0617430U - Clipper brush cutter - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the work efficiency of mowing on obstacles such as walls, extend the life of the mowing blade and reduce the frequency of replacement. [Structure] A clipper type brush cutter in which the cutting blades (14, 15) are reciprocated, wherein the cutting blades (14, 15) are
The blade edge (14a, 15a) of the blade formed at the foremost end on at least one side as viewed from the longitudinal centerline (c) of the case and the lateral end portion (A or B, or A and B) of the case (4). On the line (a or b, or a and b), the cutting edges formed between the cutting edges (14a, 15a) of the frontmost blade and the case (4) are formed so as to be aligned in a straight line. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a clipper type brush cutter, and more particularly to a clipper type brush cutter in which a cutting blade is reciprocally moved through a power transmission means such as an eccentric cam.

[0002]

[Prior art]

 For example, in a clipper-type brush cutter for mowing weeds on ridges or irrigation canals, cutting grass, cutting hedges, etc., an internal combustion engine usually installed at one end of the operating rod Outputs from power sources such as the above are transmitted to a cutting blade device via a power transmission device, and slender blades are relatively reciprocally moved in the longitudinal direction to cut plants.

A clipper type brush cutter that reciprocates such a cutting blade is well known in the art, as shown in FIG. 5, for example. FIG. 5 is a plan view of the brush cutter according to the conventional embodiment. In the figure, a pair of upper and lower cutting blades 61 and 62, which are made of elongated steel plates as a whole, are arranged so as to project from the case 63 to one outside (front side) thereof. It is supported. A cutting blade protection plate 66 is provided at the tip of each of the cutting blades 61 and 62. The output from the power source is transmitted to the cutting blades 61 and 62 via the power transmission means arranged in the case 63 so that the cutting blades 61 and 62 slide in the front-rear direction in mutually opposite phases. It has become.

[0004]

[Problems to be solved by the device]

 As described above, in the conventional clipper-type brush cutter, the line segment connecting the tips of the blades forming the cutting blade is more parallel to the line segment from the lateral end of the case and extending forward. Is also configured to be recessed inward by L. For this reason, for example, in order to mow a fence, the most common practice is to press the front edge of the cutting blade and the lateral edge of the case firmly against the fence. However, in this case, there is a gap between the cutting blade and the fence in the vicinity of the case, which causes an uncut portion.Therefore, the uncut portion must be worked by pulling the reaperable tip toward you. However, there is a problem that the work efficiency is not good.

Further, when such a brush cutter is frequently used for fence work, only the front end portion of the cutting blade is always operated, and it is easy to damage or wear only the cutting edge of the front end portion of the cutting blade, and the operation is performed. However, there was a problem that it was uneconomical because the cutting blade had to be replaced frequently. The present invention has been made in view of such a problem, and its purpose is to improve the efficiency of work for mowing particularly when an obstacle wall such as a fence is used, and to extend the life of the cutting blade to reduce the frequency of replacement. It is to provide a clipper-type brush cutter, which is adapted to reduce the number.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a clipper type brush cutter according to the present invention includes a case internally provided with a power transmission device for converting a rotary motion into a linear reciprocating motion, and a case protruding forward from the case in a front-back direction. A cutting blade supported slidably, and reciprocating the cutting blade by transmitting the rotational driving force of a main shaft rotatably supported in the case via the power transmission device. In the clipper-type brush cutter, the cutting edge of the foremost blade is located on the line connecting the cutting edge of the blade formed at the foremost end on at least one side with respect to the longitudinal centerline of the cutting blade and the lateral end of the case. Each of the cutting edges formed between the cutting edge and the case is formed so as to be aligned.

[0007]

[Action]

 In the hair clipper-type brush cutter according to the present invention constructed as described above, when the main shaft rotates, the cutting blade reciprocates back and forth. At this time, each cutting edge of the cutting blade reciprocates on a line connecting the cutting edge of the blade formed at the foremost end and the lateral end of the case.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a clipper type brush cutter according to the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. Further, FIG. 3 is a view of the cutting blade and the power transmission section taken along the line III-III in FIG.

The clipper type brush cutter 1 has a case 4 attached to the tip of a gear reduction device 3 connected to the tip of an operating rod 2 of the brush cutter so that the angle can be varied, and the case 4 is attached by a plurality of bolts. It consists of upper and lower halves 5 and 6 joined together. The case 4 rotatably vertically supports a main shaft 7 driven by a transmission shaft (not shown) of the operation rod 2 via bearings 8 and 9, and the main shaft 7 is the gear reduction device 3 Output gear 10 is integrally connected. The main shaft 7 is provided with a pair of circular eccentric cams 12 and 13 which are vertically separated from each other in the axial direction. The eccentric cams 12 and 13 are arranged with an angular phase shifted from each other by 180 degrees. ing.

Further, a pair of upper and lower separating blades 14 and 15 in the form of elongated plates are arranged so as to project from the inside of the case 4 to the front outside thereof, and are housed in the case 4 of the cutting blades 14 and 15. The blade portions 16 and 17 in the front part and the power transmission parts 18 and 19 in the rear part of the part that are supported are respectively supported by the case 4 and the upper guide member 20 and the lower guide member 21 at the side end portions thereof. ing. Further, the outer ends of the power transmission parts 18, 19 and the inner ends of the blade parts 16, 17 can be detachably engaged with each other by T-shaped groove fitting parts 32, 33. In this state, the cutting blades are integrated so that they can slide in the front-rear direction.

The power transmission parts 18, 19 are formed with laterally curved parts 34, 35 swelling on both sides in the middle part of the case 4, and are elongated in the central part in the longitudinal direction. Holes 36 and 37 are provided. By disposing the two upper and lower eccentric cams 12 and 13 on the upper and lower surfaces of the power transmission portions 18 and 19 that are overlapped with each other and penetrating the main shaft 7 in the vertical direction, the main shaft 7 and the eccentric cams 12 and 13 are separated from each other. The upper and lower eccentric cams 12 and 13 are integrated with each other and are arranged so as to have an angular phase shifted from each other by 180 degrees.

The driven members 41, which are in contact with the upper and lower surfaces of the upper and lower power transmission parts 18, 19 of the cutting blades that are overlapped with each other, and on the same plane as the eccentric cams 12 and 13 as a follower of cam movement, 42 is provided along the front-back direction (longitudinal direction) of the cutting blades 14, 15. The lower driven member 41 is a plate-shaped member in which a connecting rod portion 23 and large and small circular rings 25 and 27 are integrally formed at both ends thereof. The upper driven member 42 also has the same shape.

The eccentric cams 12 and 13 are pivotally fitted to the large-end circular rings 25 and 26 of the driven members 41 and 42, respectively. Further, the small end circular rings 27 and 28 of the driven members 41 and 42 are pivotally attached to the cutting blades 14 and 15 by pins 29 and 30 respectively. In FIG. 3, the blade edges 14a and 15a of the blade portions 16 and 17 extend from the lateral end points A and B of the case 4, which are the most outwardly protruding, in parallel with the central axis c of the blade portions 16 and 17. It is formed by stretching to the positions of line segments a and b. That is, the blade width of the blade portions 16 and 17 matches the maximum width of the case 4. A blade edge protection plate 50 is provided at the front ends of the blade portions 16 and 17.

Next, the operation of the clipper-type brush cutter having the above-described structure according to the embodiment of the present invention will be described. When the main shaft 7 is driven and rotated by the decelerating rotational force from the gear reduction device 3, the eccentric cams 12 and 13 rotate. As a result, the upper and lower driven members 41 and 42 reciprocate in the front-rear direction in mutually opposite phases, and, in synchronization with this, the power transmission parts 18 and 19 of the cutting blade and the blade integrated with these. The parts 16 and 17 are also reciprocally moved in the front-rear direction to cut plants and the like.

When cutting an obstacle wall such as a fence, the cutting edges 14 a and 15 a on the front ends of the cutting blades 14 and 15 (the cutting edge protection plate 50) and the lateral end A of the case 4 are removed. The mowing work is carried out with the wall pressed exactly against the obstacle wall (that is, the line segment a touches the wall surface). In this way, when the brush cutter is brought into contact with the wall surface, there is no gap between the blade tips 14a, 15a of all the blades and the wall surface in the entire length in the length direction of the cutting blade. The cutting space can be reduced as much as possible, the mowing space that can be mowed at one time on the fence is increased, the working efficiency is improved, and the early wear of the front end portion of the mowing blade can be prevented.

Further, with the above-mentioned configuration, the same result can be obtained even when the other side (shown by the line segment b) of the cutting blades 14 and 15 is brought into contact with the wall surface to perform the work. Next, another embodiment of the clipper type brush cutter according to the present invention will be described with reference to FIG. FIG. 4 is a partial cross-sectional view showing the cutting blade and the power transmission unit. 4, parts corresponding to the respective parts of the hair clipper-type brush cutter shown in FIG. 3 are given the same reference numerals, duplicate explanations thereof will be omitted, and only different points will be described.

In the present embodiment, the central axes c of the cutting blades 14 and 15 are eccentric from the straight line d including the center of the main shaft 7 to one side by L. That is, on the front side of the laterally curved portions 34 and 35 (on the side where the blade portions 16 and 17 are attached), the dynamic force transmission portions 18 and 19 are displaced by L toward the lateral end portion A side of the case 4. Has been formed. As described above, in this embodiment, the cutting edges 14a and 15a on one side of the cutting blade are arranged side by side on the line a, even if the blade width of the blade portions 16 and 17 is smaller than that in the embodiment of FIG. Therefore, the weight can be reduced as compared with the above-mentioned embodiment.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the present invention described in the scope of claims for utility model registration. It is possible to make design changes. For example, it is clear that the same action and effect can be obtained even if the cutting blade is not integrally formed but integrally formed. Further, in the embodiment shown in FIG. 4 described above, the cutting blade may be eccentrically arranged on the opposite side of the axis d.

[0019]

[Effect of device]

 As can be understood from the above description, according to the present invention, it is possible to improve the working efficiency of mowing on an obstacle wall such as a fence, extend the life of the mowing blade and reduce the frequency of replacement.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a clipper type brush cutter according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 III-III of FIG. 1 showing a cutting blade and a power transmission unit
View from the arrow.

FIG. 4 is a view corresponding to FIG. 3 showing a cutting blade and a power transmission unit according to another embodiment of the present invention.

FIG. 5 is a plan view of a cutting blade device according to a conventional example.

[Explanation of symbols]

 4 Case 7 Main spindle 12 Eccentric cam 13 Eccentric cam 14 Cutting blade 14a Cutting edge 15 Cutting blade 15a Cutting edge 41 Follower member 42 Follower member

Claims (1)

[Scope of utility model registration request] 1. A case (4) having a power transmission device (12, 13, 41, 42) for converting a rotary motion into a linear reciprocating motion, and a case projecting forward from the case (4) in a front-back direction. A cutting blade (14, 15) slidably supported by the power transmission device (12, 13,) for rotating the main shaft (7) rotatably supported by the case (4).
41, 42) to transmit the cutting blade (1
In the clipper-type brush cutter, the blade tips (14a, 14a, 14a, 14a, 15b) formed at the foremost end on at least one side of the cutting blade (14, 15) in the longitudinal centerline (c). 15a) and the lateral end portion (A or B, or A and B) of the case (4) on the line (a or b, or a and b) connecting the frontmost blade edge (14a, A hair clipper type brush cutter, wherein the cutting edges formed between the case 15a) and the case (4) are formed so as to be aligned in a straight line.