JPH069417U - Winding prevention cover for brush cutter - Google Patents

Abstract

(57) [Abstract] [Purpose] The grass blade prevents the grass piece from wrapping around the bearing body that supports the blade, and
Easy to assemble. A first engagement portion protruding to an outer peripheral surface of the bearing body and a second engagement portion protruding to an inner diameter surface of a cover fitted to the outer periphery of the bearing body and engaging with the first engagement portion One of them is provided so as to be inclined with respect to the circumferential direction of the bearing body in the direction of rising in the rotation direction of the rotary blade, and a stopper that locks the upward movement of the cover is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a brush cutter for mowing grass and the like on the ground by a rotary blade that is supported by a cylindrical bearing body and that rotates in a horizontal direction. The present invention relates to a conical winding prevention cover that is close to the upper surface of a rotary blade.

[0002]

[Prior art]

 Conventionally, as shown in FIGS. 7 and 8, this type of cover has been formed by notching one side of the cover in a plane including the center line, and tightening and fixing with a bolt that crosses this notch.

That is, generally, in a brush cutter, as shown in FIGS. 1 and 7, a cylindrical support body 5 is integrally fixed to a bearing body 3 that pivotally supports a rotary blade 1 that rotates in a horizontal direction. The other end of the tubular connecting rod 7 having one side fixed to 5 is fixed to the engine 9, and the rotary blade 1 is rotated by the drive of the engine 9 via the transmission shaft 11 penetrating the inside of the connecting rod 7. It is closed. A grip portion 13 and a handle 15 are fixed to the connecting rod 7, and a grip portion 17 is fixed to the handle 15.

The lower end of a rotary shaft 23 vertically supported by bearings 19 and 21 inside the bearing body 3 is engaged with a spline 24, and the rotary blade 1 is attached to a bolt 29 via lower washers 25 and 27. It is fastened and fixed by. A bolt cover 31 is fastened together to prevent the head of the bolt 29 from coming into contact with the ground.

A bevel gear 33 is engaged with the upper part of the rotary shaft 23. A bevel gear 37, which is axially supported by a bearing 35, is connected to the transmission shaft 11 by a spline 39 inside the support body 5.

Further, a conical cover 41 for preventing grass or the like from being wound around the rotary blade 1 and the bearing body 3 or in the vicinity thereof is fixed to a lower portion of the outer periphery of the bearing body 3.

As shown in FIGS. 7 and 8, the conventional cover 41 is notched on one side in a plane including the center line, and is fastened to the outer periphery of the bearing body 3 by a bolt 45 that traverses the notch 43. It was fixed.

[0008]

[Problems to be solved by the device]

 In the conventional cover 41, grass may be caught around the bolt 45 and the notch 43 and cause wrapping. Also, the lower end surface of the cover may not be uniform due to deformation due to tightening, and the gap with the rotary blade is very small. There was a risk that it would not be possible to maintain the temperature evenly and uniformly. In addition, there is a problem that the strength of the cover is reduced due to the notch.

[0009]

[Means for Solving the Problems]

 According to the present invention, at least one of a first engaging portion protruding on an outer peripheral surface of a cylindrical bearing body and a second engaging portion protruding on an inner diameter surface of a cover and engaging with the first engaging portion is provided. The bearing is provided so as to be inclined with respect to the circumferential direction of the bearing body in the direction of rising in the rotation direction of the rotary blade, and a stopper that locks the upward movement of the cover is provided.

[0010]

[Action]

 In order to mount the cover in the present invention, the cover is fitted to the outer periphery of the bearing body from below, and the cover is rotated in the rotation direction of the rotary blade, so that the second locking portion engages with the first locking portion. The cover then rises and comes into contact with the stopper to fix it.

[0011]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. 2 to 4, the same reference numerals as those shown in FIGS. 1 and 7 represent the same components.

A band-shaped first engaging portion 47 is provided so as to project on the outer peripheral surface of the bearing body 3, and a second engaging portion 49 that engages with the first engaging portion 47 is provided on the inner diameter surface of the cover 41. Are provided so as to project. The first engaging portion 47 and the second engaging portion 49 are arranged so as to rise in the rotational direction of the rotary blade 1 (counterclockwise when viewed from above in this embodiment) with respect to the circumferential direction of the bearing body 3. In addition to being provided at an inclination, a stopper 51 is formed on the outer periphery of the bearing body 3 so as to project on the upper end of the cover 41 and lock the upward movement of the cover 41. .

When performing the mowing work, the grips 13 and 17 are grasped by both hands, and the grass on the ground is mowed by the rotary blade 1 which is rotated by the drive of the engine 9. The grass piece that rotates together with the rotary blade 1 and tries to enter between the bearing body 3 and the rotary blade 1 is excluded upward along the conical surface of the cover 41, and therefore does not wind.

To mount the cover 41, the cover 41 is inserted into the outer periphery of the bearing body 3 from below with the rotary blade 1 removed, and the cover 41 is brought into contact with the stopper 51 in the rotational direction of the rotary blade 1. When the cover 41 is rotated up to, the cover 41 is fixed by the stopper 51 and the first engaging portion 47, and even if the cover 41 comes into contact with the rotary blade 1 via a grass piece during work, the cover 41 is urged in the rotational direction. Therefore, the fixing is securely held.

It should be noted that in the above-described embodiment, both the first engaging portion 47 and the second engaging portion 49 are formed in a band shape, but in the present invention, FIG. 5 a), (b), ( As shown in c), either one may be formed in a rectangular shape, an elliptical shape, or a circular shape. Further, as shown in FIG. 6, it may be formed in a screw shape.

[0016]

[Effect of device]

 The present invention has the following effects.

(1) Since there are no bolts or cutouts, the possibility that the grass pieces will wind up is further reduced.

(2) Since there is no deformation caused by tightening the bolts, the gap between the lower end surface of the cover and the upper surface of the rotary blade can be made uniform and small, and the risk of wrapping is further reduced.

(3) Since there is no notch, the strength does not decrease and the weight can be reduced.

(4) Assembly is easy without the need for tools.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a brush cutter.

FIG. 2 is a cutaway side view of a portion of an embodiment of the present invention.

FIG. 3 is a front sectional view of the same.

FIG. 4 is a side sectional view of an embodiment of the cover of the present invention.

FIG. 5 is a side view of another embodiment of the engaging portion, where (a) is a short shape, (b) is an elliptical shape, and (c) is a circular shape.

FIG. 6 is a side sectional view of another embodiment of the cover of the present invention.

FIG. 7 is a side sectional view of a main part of a conventional example.

FIG. 8 is a plan view of a conventional cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary blade 3 bearing body 41 cover 47 first engaging body 49 second engaging body 51 stopper

Claims (1)

[Scope of utility model registration request] 1. A rotary blade 1 which rotates in a horizontal direction is axially supported by a cylindrical bearing body 3 and is fitted to the outer periphery of the bearing body 3 so that the lower edge is close to the upper surface of the rotary blade 1. A conical cover 41 is provided, and a first engaging portion 47 protruding on the outer peripheral surface of the bearing body 3 and a second engaging portion protruding on the inner diameter surface of the cover and engaging with the first engaging portion 47. At least one of the parts 49 is provided so as to be inclined with respect to the circumferential direction of the bearing body 3 in a direction in which it rises in the rotation direction of the rotary blade 1, and is responsible for the upward movement of the cover 41. A winding prevention cover for a brush cutter, which is provided with a stopper 51 for stopping.