JP2000135029A - Hedge trimmer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hedge trimmer especially suitable for works not needing wide shearing widths, such as garden plant-pruning works. SOLUTION: This hedge trimmer is provided with a pair of upper and lower blades 4, 5 wherein cutting edges are longitudinally formed in a comb teeth-like shape, a motor 11, and a mechanism 12 for converting the rotation movement of the output shaft 11a of the motor 11 to the longitudinal reciprocating movement of at least one of the blades 4, 5. Therein, the shearing width of a pair of the blades 4, 5 is set to <=250 mm, and the consumed power of the motor 11 is set to <=100 W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hedge trimmer used for pruning trees and the like.

[0002]

2. Description of the Related Art As an electric tool used for pruning a tree or shaping a hedge, a hedge trimmer that reciprocates a pair of upper and lower blades having comb-shaped cutting edges along the longitudinal direction in the longitudinal direction thereof is used. Is known (eg,
-28326, JP-A-9-172866).

In this type of hedge trimmer, it is considered that a long blade is desirable in view of its application, and the cutting width of the blade is set to 300 to 700 mm. In order to drive a long and heavy blade, a motor having a power consumption of 150 W or more is used as a driving source of the blade. In such a combination, the total weight of the hedge trimmer will be 1.7-6 Kg.

[0004]

By the way, the user of the hedge trimmer uses the hedge trimmer not only for the pruning operation of the hedge which requires a wide cutting width but also for the pruning of garden trees, for example, the ball making of boxwood or the like. The cutting width of 300 mm or more is not necessary in the pruning of the ball-making, and such a long blade rather deteriorates the working efficiency. Moreover, the conventional hedge trimmer is heavy and cannot be stably supported with one hand. Therefore, the user needs to perform the pruning operation while supporting the main body of the hedge trimmer with both hands, and in that state, the workability is poor and the fatigue is large.

Accordingly, an object of the present invention is to provide a hedge trimmer that is particularly suitable for an operation that does not require a wide cutting width, such as a pruning operation of a garden tree.

[0006]

Hereinafter, the present invention will be described. In addition, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated embodiment.

According to a first aspect of the present invention, there is provided a motor (11) comprising a pair of upper and lower blades (4, 5) having comb-shaped cutting edges (4a, 5a) formed in a longitudinal direction, a motor (11), A mechanism (12) for converting the rotation of the output shaft (11a) into the reciprocating motion of at least one of the pair of blades in the longitudinal direction.
The cutting width (L) of the pair of blades (4, 5) is 250 mm in the hedge trimmer (1) provided with
Hereinafter, the above-described problem is solved by setting the output power consumption of the motor (11) to 100 W or less. Further, in the invention of claim 2, the motor (11) is a magnet motor.

[0008]

1 and 2 show an example of a hedge trimmer to which the present invention is applied. Hedge trimmer 1
Has a main body 2 and a blade assembly 3 attached to the front end of the bottom surface of the main body 2. The blade assembly 3 has a pair of upper and lower blades 4 and 5 and blade guides 6 and 7 for vertically sandwiching and guiding them in the longitudinal direction. The blade guides 6 and 7 are attached to the bottom of the main body 2 at the rear end side (the left end side in FIGS. 1 and 2) using screws 8 or the like. Cutting edges 4a and 5a are formed on the side edges of the blades 4 and 5, respectively, in a comb shape (see FIG. 2). Pitch P of cutting blades 4a, 5a
1, P2 are equal to each other.

The main body 2 has a casing 10, and a motor 11 as a drive source of the blade assembly 3 and an output shaft 11 of the motor 11 are provided inside the casing 10.
and a conversion mechanism 12 for converting the rotational movement of the blade a into the reciprocating movement of the blades 4 and 5. Conversion mechanism 12
Is a pinion 13 attached to the output shaft 11a of the motor 11, and an intermediate gear 14 meshing with the pinion 13.
And an output gear 15 that meshes with the intermediate gear 14, and an eccentric cam 16 attached to the output gear 15. The outer circumference of the eccentric cam 16 is eccentric with respect to the gear shaft 17 of the output gear 15, and the rear ends of the blades 4 and 5 engage with the outer circumference. When rotation is transmitted from the pinion 13 to the output gear 15 via the intermediate gear 14, the eccentric cam 16
7, and the blades 4, 5 alternately reciprocate in their longitudinal direction. By this reciprocating motion, the cutting blades 4a and 5a relatively move in the longitudinal direction, and the branches and the like guided between them are cut. Note that only one of the blades 4 and 5 may be reciprocated by the eccentric cam 16.

The casing 10 is provided with a handle 10a, an auxiliary handle 10b, and a guard 10c. A trigger switch 18 is attached to the handle 10a.
When the user of the hedge trimmer pushes the trigger switch 18, the micro switch 19 is turned on, the power is turned on to the motor 11, and the rotation is started.

In the hedge trimmer 1 having the above structure, the cutting width of the blades 4 and 5 corresponds to the distance L from the front end A to the rear end B of the lower blade 5 where the cutting blade 5a is provided. This cutting width L is set to 250 mm or less. The motor 11 has a power consumption of 100 W
The following are used:

When the cutting width L is limited to 250 mm or less, the blades 4 and 5 are lighter than the conventional blades, can be driven with a small torque, and the load applied to the blades 4 and 5 during the operation is reduced. Therefore, a practically sufficient cutting force can be obtained even with a small motor having a power consumption of 100 W or less. In addition, by limiting the driving source of the blade to a motor having a power consumption of 100 W or less, the total weight of the hedge trimmer can be reduced to 1 kg or less, and in combination with the downsizing of the motor 11, the hedge trimmer is small and light enough to be easily held with one hand. Can be Moreover, since both the blades 4 and 5 and the main body 2 are reduced in size and weight, the weight balance of the hedge trimmer at the time of use is good, and the hedge trimmer can be stably supported with one hand. Furthermore, since the blades 4 and 5 are shorter than before, the blades 4 and 5 are not unnecessarily long and do not hinder the work when performing the work in which the cutting range is relatively narrow as in the above-described bead making operation. For this reason, it is possible to efficiently and comfortably perform a work with a relatively narrow pruning area, such as pruning work for a garden tree or the like, thereby significantly reducing user fatigue. Since the blades 4 and 5 are short, the cutting force per blade is improved as compared with a hedge trimmer using an engine or a motor having the same output, and thicker branches can be cut.

The cutting width L is preferably set to 100 mm or more. If it is less than 100 mm, the workable range at the same time becomes too narrow, and the work efficiency deteriorates. Although various types of motors 11 may be used,
It is desirable to use a magnet motor. A magnet motor is a permanent magnet type DC motor that generates a field for rotating a rotor by a permanent magnet, and is lighter and lighter than a field winding type motor that generates a field using an electromagnet. This is advantageous in terms of miniaturization.

The present invention can be implemented in various forms without being limited to the above-described embodiments. For example, the shape of the blade may be variously changed. The mechanism for converting the rotational motion of the motor into the reciprocating motion of the blade is not limited to the one using the eccentric cam.

[0015]

As described above, according to the present invention, the cutting width of the blade is limited to 250 mm or less, and at the same time, the motor for driving the blade is limited to a power consumption of 100 W or less. A hedge trimmer that can be stably supported can be provided. When performing an operation in which the cutting range is relatively narrow, such as a bead-making operation, the blade is not unnecessarily long, and there is no possibility that the blade will obstruct the operation. For this reason, it is possible to efficiently and comfortably perform a work with a relatively narrow pruning area, such as pruning work for a garden tree or the like, thereby significantly reducing user fatigue. There is also an advantage that the cutting force per blade is improved, and thicker branches can be cut. Further, when a magnet motor is used, the motor can be further reduced in size and weight, and the effect of the present invention can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hedge trimmer according to an embodiment of the present invention.

FIG. 2 is a plan view of the hedge trimmer of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hedge trimmer 2 Main body 3 Blade assembly 4,5 Blade 4a, 5a Cutting blade 6,7 Blade guide 10 Casing 11 Motor 11a Output shaft 12 Conversion mechanism L Cutting width

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[Procedure amendment]

[Submission Date] February 8, 2000 (200.2.8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

According to a first aspect of the present invention, there is provided a motor (11) comprising a pair of upper and lower blades (4, 5) having comb-shaped cutting edges (4a, 5a) formed in a longitudinal direction, a motor (11), A mechanism (12) for converting the rotation of the output shaft (11a) into the reciprocating motion of at least one of the pair of blades in the longitudinal direction.
The cutting width (L) of the pair of blades (4, 5) is 250 mm in the hedge trimmer (1) provided with
Hereinafter, the above-described problem is solved by setting the output power consumption of the motor (11) to 100 W or less. Further, in the invention of claim 2, the motor (11) is a magnet motor. In the invention of claim 3, the pair of blades (4, 4)
5) The cutting width (L) by 100mm or more and 250m
m or less.

Claims (2)

[Claims] 1. A pair of upper and lower blades having cutting teeth formed in a comb shape along a longitudinal direction, a motor, and rotation of an output shaft of the motor by reciprocating at least one of the pair of blades in the longitudinal direction. A hedge trimmer comprising a mechanism for converting into motion, wherein a cutting width of the pair of blades is set to 250 mm or less, and power consumption of the motor is set to 100 W or less. 2. The hedge trimmer according to claim 1, wherein the motor is a magnet motor.