JP2579303Y2 - Hair clipper type brush cutter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clipper-type brush cutter and, more particularly, to a clipper-type brush cutter in which a pair of upper and lower cutting blades reciprocate via power transmission means such as an eccentric cam.

[0002]

2. Description of the Related Art For example, in a hair clipper-type brush cutter for cutting weeds, such as cutting weeds, cutting lawns, cutting hedges, etc. on levee or irrigation canals, it is usually installed at one end of an operation rod. Output from a power source such as an internal combustion engine
The cutting is transmitted to a cutting blade device via a power transmission device, and a pair of upper and lower elongated cutting blades are reciprocated relatively to each other in a longitudinal direction to cut vegetation.

[0003] When the work is performed by reciprocating the two clippers, the blade is spilled or broken, and the power transmission device must be disassembled in order to replace or polish the blade. And cumbersome removal, disassembly, and assembly operations had to be performed. Therefore, in order to facilitate the work such as removal and replacement of the cutting blade, only the cutting blade portion is of a separate type.
As disclosed in Japanese Patent Application Laid-Open No. 8-216, Japanese Utility Model Application Laid-Open No. Hei 164-2422, and Japanese Utility Model Application No. Hei 3-106427 relating to the application of the present applicant, it has been conventionally known. FIG. 5 is a plan view showing a main part of such a conventional separation type cutting blade.

In FIG. 5, a crank rod 60 for converting a rotary motion into a linear reciprocating motion is provided with a horizontally long slot 61 into which a cam (not shown) is fitted, and the cam rotates in the slot 61. Thus, the rotational motion of the cam is converted into a linear reciprocating motion. A connecting piece 62 is formed at the other end of the crank rod 60, and is detachably fitted into a notch 71 formed at one end of the cutting blade 70. In this way, the two are integrated in a fitted state and are capable of linear reciprocating motion.

[0005]

As described above, in the conventional hair clipper-type brush cutter, for example, when it is frequently used for work using only the tip of the cutting blade, for example, for work such as mowing of levee, the tip of the cutting blade is reduced. In many cases, blade spilling or breakage often occurs only at the (front) portion, and there has been a problem that the blade must be frequently replaced or polished for operation.

[0006] The present invention has been made in view of such a problem, and its object is to provide, in particular, a simple structure and
An object of the present invention is to provide an economical clipper-type brush cutter that can easily change the mounting direction and can maintain the life of the separation-type cutting blade itself for a long time.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a clipper-type brush cutter according to the present invention is drivingly connected to a power transmission device for converting a rotary motion into a linear reciprocating motion, and is slid in a longitudinal direction. A hair clipper-type trimmer including a power transmission portion and a blade portion which can be freely reciprocated, and a separation type cutting blade which is detachably detachable from each other by forming a fitting portion in each of the power transmission portion and the blade portion. A fitting portion engageable with the power transmission portion is formed at both ends in the direction.

[0008]

In the hair clipper-type brush cutter according to the present invention constructed as described above, when the cutting edge needs to be replaced or polished due to spilling or breakage of the blade, only the blade is powered. The sharp blade portion is again positioned at the tip of the cutting blade by removing the power transmission portion, changing the direction, and engaging the fitting portion formed at the other longitudinal end of the blade portion with the fitting portion of the power transmission portion. You.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the clipper-type brush cutter according to the present invention, and FIG. 2 is a sectional view taken along the line II-II of FIG. FIG.
Is a partially cutaway plan view showing a cutting blade and a power transmission unit (FIG. 1).
FIG. 4 is a plan view of the blade portion.

The clipper-type brush cutter 1 includes an operating rod 2 of the brush cutter.
And a case 4 attached to the end of the gear reduction device 3 connected to the end of the gear variably. The case 4 is composed of upper and lower halves 5 and 6 integrally connected by a plurality of bolts. 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 connected to the gear reduction device 3. To the output gear 10. The main shaft 7 is provided with a pair of circular eccentric cams 12 and 13 vertically separated from each other in the axial direction, and these eccentric cams 12 and 13 are arranged with an angular phase shifted by 180 degrees from each other. ing.

Further, a pair of upper and lower separated cutting blades 14 and 15 in the form of an elongated plate are disposed so as to protrude from the inside of the case 4 to the front and outside thereof, and a blade portion 16 at a front portion of the cutting blades 14 and 15 is provided. , 17 are supported by an upper guide member 20 and a lower guide member 21 at the side ends of the case 4, respectively.

The case 4 of the power transmission units 18 and 19
T-shaped connecting pieces 32 and 33 are integrally formed on the outer end protruding from the outer peripheral portion, and the inner ends of the blade portions 16 and 17 are detachably engaged with the connecting pieces 32 and 33, respectively. Possible T-shaped notches 51, 52 are formed. When the connecting pieces 32 and 33 are engaged with the notches 51 and 52, the cutting blades 14 and 15 are integrally slidable in the front-rear direction.

Then, as shown in FIG.
The power transmission portions 18 are provided at both ends in the longitudinal direction of (17).
T-shaped cutouts 51 and 53 (52, 54) are formed to engage with the T-shaped connecting piece 32 (33) of (19).
The power transmission portions 18 and 19 have laterally curved portions 34 and 35 bulging out on both sides in an intermediate portion in the case 4, and have a long hole 36 in a central portion in the longitudinal direction.
37 are drilled. The superimposed slot 36,
37, the upper and lower eccentric cams 12, 13
And by vertically penetrating the main shaft 7,
The main shaft 7 and the eccentric cams 12 and 13 are integrated, and the upper and lower eccentric cams 12 and 13 are disposed so as to have an angular phase shifted by 180 degrees from each other.

The eccentric cam 1 contacts the upper and lower surfaces of the upper and lower power transmission portions 18 and 19 of the cutting blade, and
On the same plane as 2 and 13, follower members 41 and 42 as followers of the cam motion are provided along the front-rear direction (longitudinal direction) of the cutting blade. The lower driven member 41 includes a connecting rod portion 23 and large and small circular ring portions 25 and 2 at both ends thereof.
7 is a plate-like member integrally formed. The upper driven member 42 also has the same shape.

The eccentric cams 12 and 13 are pivotally fitted to the large end rings 25 and 26 of the driven members 41 and 42, respectively. The small end ring portions 27 and 28 of the driven members 41 and 42 are pivotally connected to the cutting blades 14 and 15 by pins 29 and 30, respectively. The front end portions of the guide members 20 and 21 are provided with a cutting blade tip protection portion 5.
0 is provided.

Next, the operation of the clipper-type brush cutter according to the embodiment of the present invention will be described.

When the main shaft 7 is driven and rotated by the reduced rotational force from the gear reduction device 3, the eccentric cams 12 and 13 rotate. Thereby, the upper and lower driven members 4
1 and 42 are reciprocated in the front-rear direction in opposite phases to each other, and in synchronism therewith, the power transmission portions 18 and 19 of the cutting blades 14 and 15 and the blade portions 16 and 17 integrated therewith are also formed. It is reciprocated back and forth, and can cut plants and trees.

When the work using only the tip of the cutting blade, such as mowing of ridges, causes blade spilling or breakage only at the tip (front portion) of the cutting blade and requires replacement of the cutting blade, After removing the upper guide member 20 and the lower guide member 21, the notch 51 (52) of the blade 16 (17) and the connecting piece 32 (33) of the power transmission unit are disengaged and both are released. Then, the blade 16 is rotated by 180 degrees on its plane, and the notch 53 formed at the other end in the longitudinal direction is cut.
(54) and the connecting piece 32 (33) are engaged to integrate the separation-type cutting blade 15 (14).

In this manner, the portion near the root (rear) of the case 4 where the degree of damage to the blade is relatively low can be easily changed to the tip of the cutting blade. Compared with the case where the blade is replaced or the blade is polished each time, the blade can be effectively used as a resource, and it can contribute to saving time and money. Furthermore, since the blade portion is configured to be freely replaceable, the material and shape of the blade portion can be selected according to various working conditions, and the performance and durability of the clipper-type brush cutter can be improved. it can.

It is preferable that the blade portion be of a double-blade type as shown in the figure because it can be used by changing the orientation four times per sheet.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the present invention described in the claims for utility model registration. It is possible to make design changes. For example, in the illustrated example, both upper and lower cutting blades are reciprocated,
One may be a fixed blade, and the shape of the fitting portion is not limited to a T-shape, but may be an appropriate shape in consideration of material removal and prevention of stress concentration.

[0022]

As will be understood from the above description, according to the present invention, the cutting blade is separated into a power transmission part and a blade part, and both ends of the blade part are detachable from the power transmission part. Therefore, the structure can be simplified, disassembly and assembly can be facilitated, and the degree of use of one blade can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal 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 is a partially cutaway plan view showing a cutting blade and a power transmission unit.

FIG. 4 is a plan view of a blade portion.

FIG. 5 is a plan view of a main part of a bush cutter according to a conventional example.

[Explanation of symbols]

 4 Case 7 Main shaft 12 Eccentric cam 13 Eccentric cam 14 Cutting blade 15 Cutting blade 16 Blade portion 17 Blade portion 18 Power transmission member 19 Power transmission member 51 Fitting portion 52 Fitting portion 53 Fitting portion 54 Fitting portion

Claims (1)

(57) [Scope of request for utility model registration] A power transmission unit (18, 19) which is drivingly connected to a power transmission device (12, 13, 41, 42) for converting a rotary motion into a linear reciprocating motion, and which is slidably reciprocated in a longitudinal direction. ) And blade portions (16, 17), and separate type cutting blades (14, 1) formed with fitting portions (32, 33, 51, 52) to be detachable from each other.
In the clipper-type brush cutter provided with 5), the blade portion (1)
6, 17) A clipper-type brush cutter characterized in that fitting portions (51, 53, 52, 54) engageable with the power transmission portion are formed at both longitudinal ends.