JPH0214350Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a mowing blade to be worn on a mower used for mowing grass.

(Prior Art) Conventional grass mowers have metal strip-shaped blades.

(Problems to be solved by the invention) In the case of the above-mentioned blade, when the blade collides with a stone, etc., it is easily subjected to impact action, and the stone, etc. is crushed at the corner of the blade, causing stone fragments to scatter. It was dangerous.

An object of the present invention is to provide a mowing blade with improved impact resistance and cutting performance.

(Means for Solving the Problems) The mowing blade of the present invention is a blade formed into an oblong plate shape from a synthetic resin material or a synthetic resin material reinforced with glass fiber, and has a recessed part on the lower surface of the blade holder. A pair of blades are arranged in a 180° rotational symmetry and are connected to both ends of the mounting part that is engaged in the fitting groove. and troughs curved into concave arc shapes form edges that are alternately connected, and curved edges curved into a substantially U-shape are formed near the tips of the double-edged parts, respectively; The double-edged portion has a structure in which a widthwise central portion near the tip thereof is formed to have the same thickness as the attachment portion.

[Function] Formed on each side edge of a pair of blade parts connected to both ends of the blade attachment part, respectively, and formed by alternately connecting convex arc-shaped peaks and concave arc-shaped valleys. Each edge improves the cutting performance of the double-edged part, and it has a curved edge that is curved into an approximately U-shape, and the thickness near the center in the width direction is the same as the thickness of the mounting part. The vicinity of the tips of the double-edged portions each formed in such a manner alleviates the impact effect when the blade collides with a stone, wall, etc., and improves impact resistance and wear resistance.

(Example) Next, an example of the present invention will be described with reference to the drawings.

The main body 1 of the lawn mower K is connected to the lower front side of the grip 2 via a connecting rod 3, and a motor 5, which is started and stopped by a switch 4 provided on the grip 2, is stored in the main body 1 facing downward. ing.

The blade holder 6 fitted onto the motor shaft 5a of the motor 5 is formed into a substantially disk shape, and a cross-sectional fitting groove 7 is provided in a penetrating manner along the diameter of the blade holder 6 on its lower surface. Two pairs of retaining pieces 8 to 8 each having a wall surface curved inwardly in a convex arc shape are formed on both sides of both ends of the fitting groove 7 to protrude from each other in opposite directions. Groove 7
A pair of locking pieces 9, 9 are protruded from the lower edges of both sides of the central portion thereof, respectively, and are laterally protruded inwardly to face each other.

The blade 10, which is removably attached to the blade holder 6 and rotates horizontally, is made of synthetic resin such as nylon resin and is formed into a horizontally long plate shape so that it can be elastically deformed. A mounting part 11 is formed to fit into the fitting groove 7, and a long hole is formed in the center of the mounting part 11 along the side edge of the mounting part 11 in order to improve the flexibility of the mounting part 11. A shaped hole 11a is provided through the mounting portion 11.
There are retaining pieces 8 of the blade holder 6 near both ends of the blade holder 6.
Step portions 11b, 11b are formed, respectively, each having an end surface curved in a concave arc shape on both sides so as to engage with the step portions 11b, 11b.

The pair of blade parts 12, 12 extend horizontally from both ends of the attachment part 11 so as to be exposed outside the blade holder 6, and are arranged oppositely in a rotationally symmetrical manner of 180 degrees. The central part has the same wall thickness as the mounting part 11 over the entire length, and the widthwise ends are each formed into a vertically symmetrical pointed shape,
Wave-shaped edges 13 to 13 are formed on each side edge of the double-edged part 12, in which peaks curved in a convex arc shape and trough parts curved in a concave arc shape are alternately connected. Curved edges 14, 14 are formed in the vicinity of both turning ends 12a of the portion 12, respectively, which are curved in a substantially U-shape in the horizontal direction so that the corners of both turning ends 12a are removed and roundedness is imparted. ing.

When attaching the blade 10 to the blade holder 6, the blade section 12 on one side is bent and inserted above both locking pieces 9 in the fitting groove 7, and then the attachment section 1
When the blade 10 is bent and press-fitted into the fitting groove 7, the blade 10 is held in a state in which the attachment portion 11 is prevented from coming out and is latched by the respective retaining pieces 8 and both latching pieces 9. Further, the blade 10 can be worn with the front and back sides reversed relative to the blade holder 6.

Furthermore, when the blade 10 is molded from so-called glass fiber reinforced plastic, in which a synthetic resin material is reinforced with glass fibers, the strength characteristics and durability of the blade 10 can be further improved.

Next, the operation and effects of the embodiment having the above configuration will be explained.

The blade 10 of this example has a rotationally symmetrical shape of 180° at each end of a mounting portion 11 that is engaged in a fitting groove 7 formed in the lower surface of a blade holder 6 formed of a synthetic resin material into an oblong plate shape. A pair of blade parts 1 arranged in
Edges 13 are formed on each side edge of the double-edged portion 12, in which peaks curved in a convex arc shape and troughs curved in a concave arc shape are alternately connected, and near the tip of the double-edged portion 12, there is an edge 13. The curved edges 14 curved in a U-shape are respectively formed, and the central part in the width direction near the tip of the double-edged part 12 is formed to have the same thickness as the mounting part 11. In order to improve the flexibility of this mounting portion 11, a long hole-shaped hole 11a is provided through the mounting portion 11 along the longitudinal direction.

Therefore, when cutting grass with a blade having a straight edge, the grass tends to escape in the radial direction of the turning circle of the edge, reducing the cutting performance. At times, the grass can be automatically introduced while sliding into the concave arc-shaped trough of the edge 13, and when the grass transitions from the crest to the trough, the grass can be accurately cut and the sharpness of the blade 10 can be significantly improved. It has a potentially improving effect.

Furthermore, even if the grass escapes from the valley, it is possible to reintroduce the escaped grass into the adjacent valley and repeat the action of cutting the grass by moving the grass from the mountain to the valley. can.

Furthermore, since the central part in the width direction near the tip of the double-edged part 12 is formed to have the same thickness as the mounting part 11, the blade 10 is prevented from being damaged by impact between the blade 10 and stones, walls, etc. It is possible to improve the durability of the blade 10 by suppressing wear and tear on both tips.

Further, since the attachment portion 11 of the blade 10 is provided with a long hole-shaped hole 11a, the blade 10 is attached to and detached from the blade holder 6 in a bent and deformed state.
The flexibility of the blade 10 can be improved to simplify the operation of attaching and detaching the blade 10 to the blade holder 6, and the flexibility of the entire blade 10 can be improved to eliminate the problem of the blade 10 breaking near the root of the blade part. be able to.

Furthermore, the blade 10 is molded from a synthetic resin material,
Since a curved edge 14 is formed near both pivot ends 12a of the double-edged portion 12, the curved edge 14 is curved into a substantially U-shape so that the corners of the pivot ends 12a are removed.
Even if the blade 10 collides with a stone or the like during mowing work, the impact effect near the swing end 12a is alleviated, and the blade 10, which is softer than the stone, is prevented from crushing the stone, and the blade 10 rebounds and escapes. This has the effect of making mowing work safer by preventing the risk of stone fragments flying away.

Therefore, when cutting grass near a stone wall or the like, the grass can be precisely and safely cut to the edge of the stone wall or the like.

(Effects of the invention) Since the present invention is configured as described above, during mowing work, the grass is introduced into the troughs of the blade and the cutting action of cutting accurately between the crests and troughs is repeated. It can cut grass, improve the sharpness of the blade, and improve the durability of the blade by suppressing wear and tear near both tips of the blade that can occur due to collisions between the blade and stones, walls, etc. This has the effect of making it possible to cut the grass at the edges.

Therefore, lawns and weeds growing along curbs and walls, as well as lawns protruding between blocks, garden stones, etc., can be precisely mowed or trimmed with the blade of the present invention.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view of the blade, and _{FIG .}
3 is a sectional view taken along the line _X2 - _X2 , FIG. 4 is a side view of the mower, and FIG. 5 is an exploded perspective view of the blade holder and blade. 10...blade, 12...blade portion, 12a...
Turning end, 13... edge, 14... curved edge.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A blade formed into an oblong plate shape from a synthetic resin material, which is attached to both ends of a mounting portion that is engaged in a fitting groove recessed on the lower surface of the blade holder. Each side edge of a pair of connected blades arranged in a 180° rotational symmetry has convex arc-shaped peaks and concave arc-shaped valleys alternately. Connected edges are formed respectively, and curved edges curved in a substantially U-shape are formed near the tips of the double-edged portions, and the central portion in the width direction near the tips of the double-edged portions is attached to the mounting portion. A mowing blade characterized in that each part is formed to have the same thickness as the other part. (2) The mowing blade according to item 1 of the scope of the utility model registration claim, characterized in that it is molded from a synthetic resin material reinforced with glass fibers.