JP2005006534A - Mowing blade structure of mowing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mowing blade structure where the mowing blade part of a mowing machine is reduced in weight into about half of the conventional one, flexion thereof is reduced by about 40% so that nuts assembling the mowing blade part do not project out of the surface of the mowing blade. <P>SOLUTION: The mowing blade has the following structure: a long lower blade 12 and a long upper blade 13 are assembled at a light-metal long concave guide bar 15 via a long upper plate 14 so that one or both of them is/are slid via power supplied from a driving source. The long concave guide bar 15 is provided with a flow concave groove 15b formed at the surface coming into contact with the long upper plate 14 so that lubricant flows toward the tip parts of the long upper blade 13 and the long lower blade 12 from their base end parts attached to a driving mechanism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting blade structure of a trimming machine used when cutting or pruning plants and hedges.
[0002]
[Prior art]
As a conventional mowing machine, for the purpose of reducing the gap between two blades and improving the sharpness when cutting vegetation, as shown in FIG. The blades 2 and 3 are sandwiched between the blade holder 4 and the holder plate 1, and are further fastened by a pan screw 5 and a nut 7 to the holder plate 1 in the blade assembly, and both end portions in a direction perpendicular to the longitudinal direction of the holder plate 1. There was a trimming machine provided with a convex portion 9 formed so as to be bent entirely (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 6-50429 (summary and FIG. 1).
[0004]
[Problems to be solved by the invention]
[0005]
In the conventional cutting blade structure of a trimming machine, when the holder plate 1 is made of iron plate (carbon steel plate), the length is about 820 g at 1100 mm, the cutting blade portion becomes heavy, and the cutting workability of vegetation is poor. It was. In addition, when a branch is caught on the cutting blade (when a weight of about 1 kg is hung on the tip), it has been experimentally found that a deflection of about 50 mm occurs.
Further, when the two blades 2 and 3 are sandwiched between the blade holder 4 and the holder plate 1 and further fastened by the pan screw 5 and the nut 7, the nut 7 protrudes from the surface of the holder plate 1 to cut the plant There was a problem (defect) that the nut 7 was caught by the cutting plant during the work.
[0006]
The present invention has been made in view of such problems, and the object of the present invention is to make the cutting blade portion about 410 g, about half that of the prior art, by using a light metal long concave guide bar. Reduced and lightened, improved the cutting workability of vegetation, and by making a long concave guide bar, when the weight of about 1kg was hung on the tip of the cutting blade part, 30mm deflection according to the experiment The bending is reduced by about 40%, and further, the nut assembled as a cutting blade portion is configured not to protrude from the surface of the cutting blade portion, thereby eliminating the problem of being caught by the plant during cutting of the plant. The lower blade and the upper blade slide without gaps to improve the sharpness of the vegetation.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention according to claim 1 is configured to slide the long lower blade 12 and the long upper blade 13 in the longitudinal direction by motive power from a driving source. The cutting blade structure of a trimming machine is characterized in that it is assembled to a long concave guide bar 15 made of light metal via a long upper plate 14 so as to move.
[0008]
Further, in the invention according to claim 2, the long concave guide bar 15 is driven by the long upper blade 13 and the long lower blade 12 on the contact surface side with the long upper plate. 2. A cutting blade structure for a trimming machine according to claim 1, wherein a flow groove 15b is formed so that lubricating oil flows from a base end portion to a tip end portion of the mechanism.
[0009]
Further, in the invention according to claim 3, the long concave guide bar 15 is formed with a concave groove 15a in the longitudinal direction, and the long lower blade 12, the spacer 16, the long upper blade 13, and the long groove. 2. A cutting blade structure for a trimming machine according to claim 1, wherein a nut 17 screwed into a bolt 18 penetrating the upper plate 14 is fitted so as not to protrude into the concave groove 15a. Is.
[0010]
According to a fourth aspect of the present invention, there is provided a long lower plate 11, a long lower blade 12, a long upper blade 13, a long upper plate 14, and a long concave guide bar 15. A cutting blade structure of a trimming machine configured to slide one or both of the lower blade 12 and the upper blade 13 in the longitudinal direction by power from a driving source, and the lower plate 11 Alternatively, the upper plate 14 or both are formed by wave-shaped leaf springs, and the lower blade 12 and the upper blade 13 are provided with a plurality of elongated holes 12a, 13a into which a plurality of spacers 16 are loosely fitted, so that the concave shape is formed. The guide bar 15 is a long bar made of light metal, and is formed with a concave groove 15a for fitting the nut 17 so that the nut 17 does not protrude from the upper surface. A trimming machine comprising: a bolt 18 penetrating a blade 12, a spacer 16, an upper blade 13 and an upper plate 14; and a nut 17 fitted in a concave groove 15a of the concave guide bar 15 to be assembled. It has a cutting blade structure.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a cutting blade structure of a trimming machine according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a cutting blade structure of a trimming machine, FIG. 2 is a cross-sectional view in the assembled state, and FIG. 3 is a perspective view of a trimming machine having the cutting blade structure of the present invention.
[0012]
As shown in FIGS. 1 and 2, the cutting blade structure of a trimming machine according to claim 1 of the present invention is a long lower blade 12 having saw blades 12b, 12b,. A long upper blade 13 having saw blades 13b, 13b,... Formed on the edges thereof, and one or both of them are slid in the longitudinal direction by the power from the drive source via the long upper plate 14. The cutting blade structure of a trimming machine is characterized by being assembled on a long concave guide bar 15 made of light metal such as aluminum or magnesium. In the embodiment shown in FIG. 1, the long lower plate 11 is brought into contact with the lower surface of the long lower blade 12, but a flat washer may be used instead of the lower plate 11. The long concave guide bar 15 can be made by extruding or drawing a light metal material such as aluminum or magnesium.
[0013]
The long concave guide bar 15 is a light metal long bar and is light in weight because the cross section is formed in a concave shape. The cutting blade portion assembled using this is 410 g in length when the length is 1100 mm. Since it is about half lighter than the conventional one, the workability when cutting vegetation is improved, and when the weight of about 1 kg is hung on the tip of the cutting blade, it is 30 mm according to the experiment. The degree of bending becomes approximately 40% less than the conventional one.
[0014]
According to the second aspect of the present invention, the long concave guide bar 15 has a drive mechanism for the long upper blade 13 and the long lower blade 12 on the contact surface side with the long upper plate 14. 2. A cutting blade structure for a trimming machine according to claim 1, wherein a flow groove 15b for lubricating oil that flows from the mounting base end portion toward the tip end portion is formed. With this configuration, the base end portion of the long upper blade 13 and the long lower blade 12 attached to the drive mechanism is filled with grease serving as lubricating oil, and drives the mower. The heat from the engine is transferred to the mounting base end portions of the both blades, and the mounting base end portions become hot and the grease softens, and the softened grease flows more easily through the flow groove 15b. Thus, the lubrication effect can be enhanced by flowing the softened grease from the proximal end portion of the blades attached to the drive mechanism toward the distal end portion.
[0015]
In the invention according to claim 3, a concave groove 15a is formed in the long concave guide bar 15 in the longitudinal direction, and the long lower blade 12, the spacer 16, the long upper blade 13 and the long concave bar 15a. The cutting blade structure 19 of the trimming machine according to claim 1, wherein a nut 17 screwed into a bolt 18 penetrating the upper plate 14 is fitted so as not to protrude into the concave groove 15a. The long concave guide bar 15 in which the concave groove 15a is formed in the longitudinal direction can be made by extruding or drawing a light metal material such as aluminum or magnesium. Then, a bolt 18 penetrating the long lower blade 12, the spacer 16, the long upper blade 13 and the long upper plate 14 is attached to the nut 17 fitted so as not to protrude into the concave groove 15a. Since the tip of the nut 17 and the bolt 18 does not protrude from the surface of the concave guide bar 15 by screwing and constituting the cutting blade structure, the tip of the nut 7 and the bolt 18 is caught by the plant to be cut. The problem disappears. Further, since the nut 17 is fitted in the concave groove 15a of the concave guide bar 15, when the bolt 18 is screwed to the nut 17 there is no rotation around the nut and the assemblability is improved.
[0016]
According to a fourth aspect of the present invention, there is provided a long lower plate 11, a long lower blade 12, a long upper blade 13, a long upper plate 14, and a long concave guide bar 15. A cutting blade structure of a trimming machine configured to slide one or both of the lower blade 12 and the upper blade 13 in the longitudinal direction by power from a driving source, wherein the lower plate 11 or the upper plate 14 or both are formed by wave-like leaf springs, and the lower blade 12 and the upper blade 13 are provided with a plurality of elongated holes 12a, 13a into which a plurality of spacers 16 are loosely fitted, and the concave shape is formed. The guide bar 15 is formed of a long bar made of light metal, and further has a concave groove 15a that is fitted so that the nut 17 does not protrude from the upper surface. A bolt 18 passing through the lower plate 11, the lower blade 12, the spacer 16, the upper blade 13 and the upper plate 14 is fastened to a nut 17 fitted in a concave groove 15 a formed in the longitudinal direction of the concave guide bar 15 and assembled. The cutting blade structure 19 of the configured mowing machine is used.
[0017]
In the embodiment shown in FIG. 1, the long lower plate 11 is formed by a wave-shaped leaf spring, but the long upper plate 14 may also be formed by a wave-shaped leaf spring. The upper plate 14 side of the scale may be formed by a corrugated leaf spring, the lower plate 11 may be eliminated, and a flat washer may be interposed on the lower surface of the lower blade 12 in the drawing when the bolt 18 is inserted. Further, in the embodiment shown in FIG. 1, the long upper plate 14 is mounted as a wear prevention plate for preventing wear due to sliding of the long upper blade 13 and the long concave guide bar 15. Yes.
[0018]
Further, in the invention according to claim 4, the lower plate 11 or the upper plate 14 or both are formed of wave-like leaf springs (in the embodiment shown in FIG. 1, only the lower plate 11 is wave-like leaf springs. As a result, the lower blade 12 and the upper blade 13 are pressed against each other, so that the lower blade 12 and the upper blade 13 slide without gaps, and the sharpness of the plants is improved. Further, the lower blade 12 and the upper blade 13 are provided with a plurality of elongated holes 12a, 12a,..., 13a, 13a. Since the spacer 16 is loosely fitted in each of the plurality of long holes 12a and 13a and the lower blade 12 and the upper blade 13 are assembled so as to be slidable in the longitudinal direction, the sliding guide between the lower blade 12 and the upper blade 13 is good. Done.
[0019]
FIG. 3 is a perspective view of a trimming machine equipped with the cutting blade structure 19 of the present invention. Reference numeral 20 is a front handle, 21 is a rear handle, 22 is a throttle lever, 23 is a lock lever, 24 is a stop switch, and 25 is an engine. , 26 is a fuel tank. As the sliding drive means for the lower blade 12 and the upper blade 13, there are various known ones not shown, and the rotational motion of the rotation shaft of the engine is converted into a linear motion by a cam mechanism or the like. The lower blade 12 and the upper blade 13 are slidably driven (see, for example, Japanese Patent Laid-Open Nos. 9-172866 and 2000-217431).
[0020]
【The invention's effect】
By using the cutting blade structure of the trimming machine as in the present invention, the following effects are obtained.
(1). According to the first aspect of the present invention, the long concave guide bar that holds the lower blade, the upper blade, and the upper plate is made of a light metal such as aluminum or magnesium from a conventional iron-based material. The blade portion can be lightened to improve the cutting workability of vegetation.
(2). According to the second aspect of the present invention, the lubricating oil easily flows from the drive mechanism portion of the long upper blade and the long lower blade toward the tip portion, and both blades slide smoothly. It becomes like this.
(3). According to the invention according to claim 3, by forming a concave groove in the longitudinal direction in a light and long concave guide bar, the rigidity is high despite the fact that this is further reduced, and the lower blade and By tightening the bolt that penetrates the spacer, upper blade, and upper plate to the nut fitted so that it does not protrude into the groove, the nut is prevented from being turned around when tightening. In addition to improving, it is possible to prevent the vegetation from being caught by the nut during cutting of the vegetation.
(4). Further, according to the invention according to claim 4, the lower plate or the upper plate or both are formed by wave-like leaf springs, so that the lower blade and the upper blade are pressed against each other and slid without gaps, The sharpness of the vegetation is improved.
In addition, by configuring as described above, the long concave guide bar, the long upper play, the spacer, and the long lower plate can be integrated into a cutting blade structure with higher rigidity. .
Further, the lower blade and the upper blade are provided with a plurality of long holes in which the spacers are loosely fitted, and the spacers are loosely fitted in the plurality of long holes so that the lower blade and the upper blade are in the longitudinal direction. Since it is slidably assembled, sliding guidance of the lower blade and the upper blade is often performed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a cutting blade structure of a trimming machine according to the present invention.
FIG. 2 is a cross-sectional view of a cutting blade structure of a trimming machine according to the present invention.
FIG. 3 is a perspective view of a trimming machine provided with a trimming blade structure for a trimming machine according to the present invention.
FIG. 4 is a cross-sectional view of a prior art cutting blade structure.
[Explanation of symbols]
11 long lower plate 12 long lower blade 12a long hole 12b saw blade 13 long upper blade 13a long hole 13b saw blade 14 long upper plate 15 long concave guide bar 15a concave groove 15b Distribution groove 16 Spacer 17 Nut 18 Bolt 19 Cutting blade structure 20 Front handle 21 Rear handle 22 Throttle lever 23 Lock lever 24 Stop switch 25 Engine 26 Fuel tank

Claims (4)

The long lower blade (12) and the long upper blade (13) are moved through the long upper plate (14) so that one or both of them slides in the longitudinal direction by the power from the driving source. A cutting blade structure of a trimming machine, which is assembled and constructed on a long concave guide bar (15) made of light metal. The long concave guide bar (15) has a drive mechanism for a long upper blade (13) and a long lower blade (12) on the contact surface side with the long upper plate (14). The cutting blade structure of a trimming machine according to claim 1, wherein a flow groove (15b) is formed so that lubricating oil flows from the mounting base end to the tip. A concave groove (15a) is formed in the long concave guide bar (15) in the longitudinal direction, and a long lower blade (12), a spacer (16), a long upper blade (13) and a long The nut (17) that is screwed into a bolt (18) that passes through the upper plate (14) is fitted so as not to protrude into the concave groove (15a). The cutting blade structure of a mower. A long lower plate (11), a long lower blade (12), a long upper blade (13), a long upper plate (14), a long concave guide bar (15), A cutting blade structure of a trimming machine configured to slide one or both of the lower blade (12) and the upper blade (13) in the longitudinal direction by power from a driving source,
The lower plate (11) and / or the upper plate (14) are both formed by wave-shaped leaf springs, and a plurality of spacers (16) are loosely fitted to the lower blade (12) and the upper blade (13). A plurality of long holes (12a) and (13a) are formed, and the concave guide bar (15) is a light metal long bar that fits so that the nut (17) does not protrude from the upper surface. Formed,
Bolts (18) penetrating the lower plate (11), the lower blade (12), the spacer (16), the upper blade (13), and the upper plate (14) are connected to the concave groove of the concave guide bar (15) ( A cutting blade structure of a trimming machine, wherein the cutting blade is assembled by tightening to a nut (17) fitted to 15a).

Images