JP7270211B2 - Protective attachment for clipper mowers - Google Patents

Description

The present invention cuts or damages man-made objects other than weeds, such as communication cables, by attaching it to the blade of the mower when mowing the ballast (track bed) of railway tracks using a clipper mower. The present invention relates to protective attachments that prevent accidents and improve the safety of the worker himself, as well as the people and equipment around him.

An example of a clipper-type mower is described in Patent Document 1. A clipper-type mower has an upper blade and a lower blade that reciprocate in opposite directions while being in surface contact with each other. , and the upper blade and the lower blade reciprocate with a stroke approximately equal to the pitch of the cutting blades, thereby shearing weeds and the like that have entered between the cutting blades. This clipper-type mower is attached to the tip of an appropriate arm and moved along a surface such as the ballast (track bed) of a railroad track or the slope of a road to cut weeds on the ballast or the slope.

JP-A-11-32541

Since the clipper-type mower drives the upper blade and the lower blade by an engine or a motor, the operator only needs to move the clipper-type mower to a place where weeds are growing, so that the labor required for mowing can be reduced. However, since the upper and lower blades are driven with a sufficiently large force, they can also cut twigs and other objects other than grass. If you do, you may accidentally cut these artifacts. Also, since the cutting blade is exposed, there is a possibility of injury if handled incorrectly.

On the other hand, mowers of the type in which a rotary blade (disk) is rotated are conventionally known. Since this type of mower is designed to cut weeds by bringing the rotary blade into contact with the ground surface or cutting it slightly into the ground surface, there is a possibility that it may cause damage to the surroundings by causing stepping stones and the like. Moreover, when the rotary blade is exposed, the rotary blade may come into contact with an artificial object and damage the artificial object. Therefore, a guard is sometimes provided to cover the outer peripheral side of the rotary blade so that the rotary blade does not come into contact with an artificial object or the like. Even if such a guard is provided, as long as the lower side of the rotary blade is open, weeds can be mowed without hindrance by bringing the rotary blade into contact with the ground surface.

The above-mentioned guard in a rotary mower can improve safety by covering the blade, but it cannot be simply diverted to a clipper type mower in which the drive mode of the cutting blade is different from that of the rotary mower. . That is, since the rotary blades of the rotary mower only need to contact or slightly cut into the surface of the ground where weeds are growing, the outer peripheral side and the upper side of the rotary blades can be covered by the guard. On the other hand, clipper mowers require cutting objects such as weeds to enter between the cutting blades of the upper blade and the lower blade. Therefore, in the clipper type mower, the tip side and the upper and lower sides of the cutting blade must be open spaces, and the guard that covers the blade like the guard in the above-mentioned rotary mower is used to cut weeds that are the object to be cut. Also, it prevents the blade from entering between the cutting blades, so it cannot be used for a clipper type mower. Conventionally, no protection measures have been known that take into consideration the characteristics peculiar to such clipper type mowers, and there is considerable room for technical development and improvement in terms of improving mowing efficiency and safety. .

The present invention has been made in view of the above technical problems, and is a clipper type mower that can avoid damage or harm to man-made objects and improve safety without impairing mowing efficiency or performance. It is intended to provide a protective attachment for

In order to achieve the above object, the present invention provides an apparatus in which an upper blade and a lower blade that are superimposed on each other and relatively reciprocate in surface contact with each other are held by a main body, and the upper blade and the lower blade are held together. Each of has a plurality of comb-shaped cutting blades protruding in a direction perpendicular to the direction of the reciprocating motion, and at least one of the side edges of the cutting blade is a cutting blade The upper blade and the lower blade reciprocally move the object that has entered between the cutting blade of the upper blade and the cutting blade of the lower blade to move the cutting blade of the upper blade and the lower blade. A protective attachment for a clipper mower configured to cut by closing the distance between the blade and the cutting blade, the upper plate being arranged along the upper blade on the upper side of the upper blade. and a lower plate arranged along the lower blade under the lower blade, wherein the upper plate and the lower plate have side edges extending toward the tip side of the cutting blade. The side edges of the upper plate and the side edges of the lower plate are in contact with each other in the vertical direction, and the side edges of the upper plate and the lower plate are in contact with each other. An introduction port having a predetermined opening width is formed in the side edge portion, and the upper plate and the lower plate extend from the introduction port to a cutting area between the cutting blades of the upper blade and the lower blade. It has an extending slit portion, and the introduction port is located between the cutting blade of the upper blade and the cutting blade of the lower blade and on the tip side of the cutting blade. It is characterized in that it is configured to be held.

Further, in the present invention, the lower plate may be formed flat, and the upper plate may have an inclined upper surface portion inclined so that the side edge portion approaches the lower plate.

In the clipper type mower targeted by the present invention, an object to be cut, such as weeds, is inserted between the cutting blade of the upper blade and the cutting blade of the lower blade, and each cutting blade is closed in that state, thereby cutting each. The blade shears the object to be cut. The object to be cut enters between the cutting blades from the tip side of the cutting blades, whereas the protective attachment according to the present invention prevents objects such as communication cables, etc., from entering between the cutting blades. It has a regulated inlet. The introduction port is a portion having an opening width equal to or less than the outer diameter (thickness) or width of the object to be cut, and is arranged on the tip side of the cutting blade. Therefore, when the clipper type mower is moved along a surface such as a ballast or a slope where weeds are growing, even if an object to avoid cutting such as a communication cable is standing up like weeds, the object to avoid cutting does not get caught in the inlet and enter between the cutting blades. On the other hand, since weeds are thinner than communication cables, they pass through the introduction port and enter between the cutting blades. Weeds are cut by each cutting blade. That is, according to the present invention, there is a function of selecting an object to be cut, such as weeds present on the ballast or slope surface, and inserting it between the cutting blades. can be prevented from entering between the cutting blades and being cut due to this. In addition, since the structure and the human body are much larger than the introduction port, contact of the cutting blade with these structures and the human body is avoided, and damage such as chipping of the cutting blade and injury to the human body is prevented. can be prevented.

In particular, the introduction port is formed at the side edges of the upper plate arranged along the upper side of the upper blade and the lower plate arranged along the lower surface side of the lower blade, which are in contact with each other . Therefore, the upper blade and the lower blade are covered by the upper plate and the lower plate , further improving safety.

In the structure in which the upper surface of the upper plate is inclined downward toward the side edge, in other words, the inclined upper surface portion gradually rises from the introduction port side, an object to be cut such as weeds is cut by each cutting blade. The object to be cut can be erected on its inclined upper surface as it enters the gap, and as a result, the lower portion (root side portion) of the object to be cut can be cut to improve mowing efficiency. can be made

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an example of a clipper type mower that can be targeted by the present invention; It is a perspective view which separates the upper blade and the lower blade vertically and shows a part of the cutting blade. It is a perspective view which shows an example of the attachment for protection which concerns on this invention. It is a top view which shows the lower plate. It is a top view which shows the upper plate. It is sectional drawing which looked at the state which combined the lower plate and the upper plate from the horizontal direction. It is a partial view showing a part of the mower equipped with the protective attachment.

EXAMPLES The present invention will be described below based on examples. First, a hair clipper type mower 1 to which the present invention is applied will be described. FIG. 1 schematically shows an example of a clipper-type mower (hereinafter simply referred to as a mower) 1. The example shown here is attached to an arm 2 suspended by a shoulder strap (not shown) or the like. , a mower that can be moved along the ground surface such as ballast or slope surface, and has a fixed bar 4 extending from a main body 3 attached to the end of an arm 2, and an upper blade 5 and a lower blade 6. is held by the body portion 3 through the fixing bar 4 .

The upper blade 5 and the lower blade 6 have the same structure as a conventionally known one, and are superimposed one on top of the other so that they are in surface contact and slide against each other while maintaining that state. In the upper blade 5 and the lower blade 6, a large number of comb-like cutting blades 5b, 6b are formed on the sides of elongated bases 5a, 6a similar to the fixed bar 4. As shown in FIG. As shown in FIG. 2, the cutting blades 5b and 6b are tapered, and both sides in the longitudinal direction of the bases 5a and 6a are linearly inclined with respect to the longitudinal direction of the bases 5a and 6a. ing. Edges on both sides thereof are formed into sharp cutting edges 5c and 6c.

The body portion 3 incorporates a drive mechanism (not shown) such as a motor, and the upper blade 5 and the lower blade 6 are connected to the drive mechanism. The drive mechanism is configured to reciprocate the upper blade 5 and the lower blade 6 along the longitudinal direction of the fixed bar 4 in opposite directions. Therefore, the cutting blades 5b and 6b protrude in a direction perpendicular to the direction in which the upper blade 5 and the lower blade 6 reciprocate, and the upper blade 5 and the lower blade 6 reciprocate in opposite directions. , the distance between the cutting blades 5b and 6b is opened and closed at high speed.

If the portion between the cutting blades 5b and 6b (more precisely, the portion between the cutting blades 5c and 6c) that is opened and closed by the reciprocating motion of the upper blade 5 and the lower blade 6 is defined as the cutting area 7, the cutting area 7 is defined as the cutting area 7. A protective attachment (hereinafter simply referred to as an attachment) 8 is configured to prevent a cut-repellent object 9 from entering its cutting area 7 . Here, the cut-avoiding object 9 is a ballast where weeds grow, an artificial object or structure such as a communication cable or a ground wire provided on a slope, or a part of a human body.

An example of the attachment 8 is shown in FIG. The example shown here is an example in which the upper blade 5 and the lower blade 6 are wrapped by the upper plate 10 and the lower plate 11 . FIG. 4 shows a plan view of the lower plate 11, and FIG. 6 shows a cross-sectional shape taken along a direction perpendicular to the longitudinal direction (width direction). The overall shape of the lower plate 11 is similar to that of the lower blade 6 described above. The portion between the comb tooth portions 11b is a slit portion 11c into which the object to be cut is inserted. The pitch of these slit portions 11c is substantially the same as the pitch of the cutting regions 7 described above. The length of the comb tooth portion 11b is longer than that of the cutting blade 6b described above, and the tip of the comb tooth portion 11b extends beyond the tip of the lower blade 6. As shown in FIG. In other words, the side edge of the lower plate 11 extends to the tip side of the cutting edge 6b of the lower blade 6, and the slit 11c is formed from the side edge toward the longitudinal direction (that is, the width direction) of the lower blade 6. It is The open end of the slit portion 11c in the width direction of the lower blade 6 serves as an introduction port 11d. The inlet 11d is formed in a _shape that gradually widens in the direction of the tip of the comb tooth portion 11b. , as shown in FIG. 7, it is set smaller than the outer diameter D ₉ of the object 9 to avoid cutting (the width if the object to avoid cutting has a rectangular cross section). That is, it is configured so that the object 9 to avoid cutting does not enter the deep inner part of the slit portion 11c (more specifically, the cutting area 7).

Next, the upper plate 10 will be described. FIG. 5 shows a plan view, and FIG. 6 shows a cross-sectional shape when cut along a direction perpendicular to the longitudinal direction (width direction). The upper plate 10 is a member arranged on the upper surface side of the upper blade 5 along the upper blade 5 , and is configured to cover the fixed bar 4 and the upper surface side of the upper blade 5 . Accordingly, the upper plate 10 has a tunnel-shaped projection 10a with a rectangular cross section for accommodating the fixing bar 4 described above. A portion from the portion 10b to the side edge portion is an inclined upper surface portion 10c. The horizontal portion 10b is a portion for securing a space between the lower plate 11 and the upper blade 5 and the lower blade 6 so as to be able to reciprocate. It is almost parallel to the plate 11. On the other hand, the inclined upper surface portion 10 c is a portion that gradually descends toward the lower plate 11 so that the side edge portion, which is the tip portion thereof, contacts the side edge portion of the lower plate 11 . That is, the inclined upper surface portion 10c is so arranged that its side edges are very close to the lower plate 11. As shown in FIG.

A plurality of slit portions 10d are formed at a constant pitch in the horizontal portion 10b and the inclined upper surface portion 10c. The shape and pitch of the slit portion 10d are the same as those of the slit portion 11c in the lower plate 11. Therefore, the upper plate 10, like the lower plate 11, has a ridge portion 10a corresponding to the main stem portion 11a and a ridge portion 10a. It has a structure having a comb tooth portion 10e extending to both left and right sides. Also in the upper plate 10, the open end of the slit portion 10d in the width direction of the upper blade 5 serves as an introduction port 10f. The inlet 10f is formed in a _shape that gradually expands in the direction of the tip of the comb tooth portion 10e. , as shown in FIG. 7, it is set smaller than the outer diameter D ₉ of the object 9 to avoid cutting (the width if the object to avoid cutting has a rectangular cross section). That is, it is configured so that the object 9 to avoid cutting does not enter the deep inner portion of the slit portion 10d (more specifically, the cutting area 7) .

FIG. 6 shows the cross-sectional shape of the above-described upper plate 10 and lower plate 11 assembled to the mower 1 . 6, the upper blade 5, the lower blade 6 and the fixed bar 4 are omitted. FIG. 7 shows a state in which the attachment 8 is in contact with the cable and structure P, which are objects 9 to avoid cutting, during mowing. As shown in FIG. 6, the upper plate 10 is attached to the fixed bar 4 (grass mower 1) by suitable means such as bolts and nuts with the ridges 10a covering the fixed bar 4. As shown in FIG. Further, the lower plate 11 is attached to the fixed bar 4 (grass mower 1) by suitable means such as bolts and nuts while being in contact with the lower surface of the fixed bar 4. As shown in FIG. In this case, since the bolt penetrates the lower blade 6, the part through which the bolt penetrates is formed as an elongated hole in order to allow the lower blade 6 to reciprocate. In this state, the upper blade 5 and the lower blade 6 are housed between the upper plate 10 and the lower plate 11 so as to be able to reciprocate. Further, the side edges of the upper plate 10 and the lower plate 11 are in contact with each other in the vertical direction. Furthermore, the comb tooth portion 10e of the upper plate 10 and the comb tooth portion 11b of the lower plate 11 overlap each other in the vertical direction, so that the respective introduction ports 10f and 11d are aligned with each other.

In this manner, the tip sides of the cutting blades 5b and 6b are covered with the comb tooth portions 10e and 11b. On the other hand, the positions of the slit portions 10d and 11c of the upper plate 10 and the lower plate 11 match the cutting area 7 between the cutting blades 5b and 6b. Therefore, the inlets 10f and 11d formed by these slits 10d and 11c serve as inlets for introducing objects to be cut such as weeds into the cutting area 7. As shown in FIG. When the cutting blades 5b and 6b are moved toward the weeds by rotating the mower 1 with the attachment 8 attached to it around the arm 2, the weeds are introduced from the introduction ports 10f and 11d into the respective cutting blades 5b. , 6b. In the cutting area 7, the upper blade 5 and the lower blade 6 reciprocate in opposite directions to open and close at high speed. be done. In this case, the portion of the object to be cut, such as weeds that has fallen or is about to fall, is pushed up by the inclined upper surface portion 10c of the upper plate 10 and, as a result, enters the cutting area 7. The part where the cutting edge 5c and 6c are is erected in a state more nearly perpendicular to the cutting edges 5c and 6c. Therefore, the cutting blades 5c and 6c can easily bite into the object to be cut, enabling efficient cutting or mowing.

On the other hand, the cut-avoidable object 9 such as a communication cable has an outer diameter _D9 larger than the opening widths W10, W11 of the inlets _10f , _11d , so the cut-avoidable object 9 is stopped by the inlets 10f, 11d. the cutting area 7. In other words, it is possible to prevent a situation such as cutting the cut-avoidable object 9 by mistake. Further, if the position where the object to avoid cutting 9 is stopped at the portion of the minimum opening width of the introduction ports 10f and 11d is set to a position where the object to avoid cutting does not hang over the tips of the cutting blades 5b and 6b, the cutting blade 5b , 6b do not contact the surface of the cut-avoidable object 9, even the surface of the cut-avoidable object 9 can be prevented from being damaged. Furthermore, when the mower 1 approaches the structure P, the side edges of the attachment 8 (tips of the comb tooth portions 10e and 11b) collide with the structure P, and the mower 1 approaches the structure P further. is prevented. In this way, the attachment 8 prevents the cutting blades 5b and 6b from coming into contact with the structure P, so that the cutting blades 5b and 6b can be prevented from being chipped or chipped, or the mower 1 can be bounced back. . Furthermore, the attachment 8 can prevent the cutting blades 5b and 6b from coming into contact with the human body, etc., so that the safety of mowing can be improved.

Since the attachment 8 described above is attached to the mower 1 and moved together with the mower 1, it is preferable that it be as light as possible. Yes, therefore the attachment 8 is preferably made of metal. In particular, from the viewpoint of durability, a stainless steel plate or a chromium-plated ordinary steel plate is suitable. Heat treatment may be performed to improve strength. In the case of mowing near railway tracks, cables near railway tracks have an outer diameter of about 15 to 30 mm. Therefore, it is preferable to prepare a plurality of types of attachments 8 such as opening widths W ₁₀ and W ₁₁ of the introduction ports 10f and 11d of 11 mm, 15 mm, and 19 mm, and to use them by replacing them according to the site conditions.

In the above-described embodiment, a mower having cutting blades on both the left and right sides was described as an example. be able to. That is, it is possible to adopt a configuration in which the comb tooth portion, the slit portion, and the like are provided only on one side portion. The cutting edge formed on the side edge of the cutting blade may be formed on at least one of the left and right side edges. Also, the mower targeted by the present invention may be of a type that is attached to a self-propelled vehicle. Furthermore , in short, the present invention prevents objects to be cut from entering the cutting area between the upper and lower cutting blades, and prevents objects such as weeds from entering the cutting area between the upper and lower cutting blades. It suffices if an introduction port that allows the cutting blade (cutting region) is provided on the tip side.

DESCRIPTION OF SYMBOLS 1... Mower 2... Arm 3... Body part 4... Fixed bar 5... Upper blade 5a, 6a... Base part 5b, 6b... Cutting blade 5c, 6c... Cutting blade 6... Lower blade 7... Cutting area 8 Attachment 9 Object to avoid cutting 10 Top plate 10a Convex portion 10b Horizontal portion 10c Inclined upper surface portion 10d Slit portion 10e Comb tooth portion 10f, 11d ...Introduction port 11...Lower plate 11a...Main stem 11b...Comb tooth part 11c...Slit part _D9 ...Outer diameter P...Structure _W10 , _W11 ...Opening width.

Claims (2)

An upper blade and a lower blade that are superimposed on each other and relatively reciprocate in a state of surface contact are held by the main body, and each of the upper blade and the lower blade moves in the direction of the reciprocation. It has a plurality of comb-shaped cutting blades protruding in an orthogonal direction, and at least one side edge of both side edges of the cutting blade is used as a cutting edge, and the cutting blade of the upper blade and the lower blade The upper blade and the lower blade reciprocate the object to be cut that has entered between the blade and the cutting blade, and the distance between the cutting blade of the upper blade and the cutting blade of the lower blade is increased. A clipper mower protective attachment configured to cut by closing, comprising:
An upper plate arranged along the upper blade above the upper blade, and a lower plate arranged below the lower blade along the lower blade,
The upper plate and the lower plate each have a side edge portion extending toward the tip side of the cutting blade,
the side edges of the upper plate and the side edges of the lower plate are in contact with each other in the vertical direction;
an introduction port having a predetermined opening width is formed in the side edge portion of the upper plate and the side edge portion of the lower plate that are in contact with each other;
The upper plate and the lower plate each have a slit portion extending from the inlet to a cutting area between the cutting blades of the upper blade and the lower blade,
The introduction port is configured to be held by the main body so as to be positioned between the cutting blade of the upper blade and the cutting blade of the lower blade and on the tip side of the cutting blade. A protective attachment for clipper mowers that features.
A clipper mower protection attachment according to claim 1 ,
The lower plate is formed flat,
A hair clipper type mower, wherein the upper plate has an inclined upper surface part inclined so that the side edge portion extending toward the tip of the cutting blade approaches the lower plate. protective attachment.

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