JPH07194224A - Electric lawn mower - Google Patents

Abstract

PURPOSE:To make the cutting quality of an electric lawn mower hardly deteriorate in mowing lawn even by use CONSTITUTION:This electric lawn mower is provided by decelerating the rotation of a motor internally installed in a frame unit so as to correspond to that of an eccentric cam 6, fitting the eccentric cam 6 into a driving hole 7 of a movable blade 5, superposed and supported on a fixed blade 3, forming a supporting hole 9 of the movable blade 5 fitted with a supporting pin 8 of the fixed blade 3 into a slot facing the edge direction, performing the rotating operation of the movable blade 5 with the supporting pin 8 as the center and front and back operation along the supporting hole 9 and thereby carrying out the cutting operation so as to rub lawn nipped between the cutting blades against either of the cutting blades.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric lawn mower having a blade edge suitable for lawn mowing at home.

[0002]

2. Description of the Related Art A lawnmower using a reel blade is generally used for cutting grass grown at home. A lawn mower using this reel blade can be used in a relatively large garden, but since it can be left uncut near a wall or garden stone, a small electric lawn mower with its blade tip protruding from the frame swings. It is used together.

In this electric lawn mower, a motor driven by a battery or an AC power source, a speed reducer and an eccentric cam are provided in a frame,
The movable blade is superposed and supported on the fixed blade which also serves as the bottom plate of the frame body, and the eccentric cam swings the movable blade to cut grass between the blade and the fixed blade.

[0004]

A lawn mower, which cuts lawn between a fixed blade and a movable blade, is used for cutting the edge of lawn, and fine sand blown by the wind adheres to the lawn at this location. In many cases, when the electric lawn mower is operated with the fine sand adhering to the turf juice adhering to the blade edge during lawn mowing, the cutting edge rapidly wears and sharpness deteriorates rapidly.

The movement of the fixed blade and the movable blade of the related art is to cut grass by sandwiching the grass between the cutting blades and pushing the movable blade with the movable blade, like ordinary scissors. Fiber grass can only be bent along a fixed blade and cannot be cut, and the grass is torn off as the movable blade is cut many times. For this reason, the efficiency of lawn mowing becomes extremely poor, and when it becomes severe, it becomes impossible to mow the lawn, and the cut portion of the lawn is discolored brown and the appearance is very poor.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an electric lawn mower that does not deteriorate sharply even when a cutting edge wears, and is fixed to a frame 2 having a motor 1 incorporated therein. A fixed blade 3 also serving as a bottom plate, a speed reducer 4 attached to the rotary shaft of the motor 1, a movable blade 5 overlappingly supported by the fixed blade 3 and swinging its edge, and a movable blade attached to the speed reducer 4 In an electric lawn mower having an eccentric cam 6 for oscillatingly driving 5, a movable blade 5 is provided with a drive hole 7 for fitting with the eccentric cam 6, and a fixed blade 3 is provided with a support for overlappingly supporting the movable blade 5. The pin 8 is provided, and the support hole 9 of the movable blade 5 that fits with the support pin 8 is formed as a long hole looking in the direction of the blade tip from the drive hole 7, and the cutting edge of the movable blade 5 swinging by the eccentric cam 6 is supported. It is engaged with the cutting edge of the fixed blade 3 while moving back and forth along the hole 9.

[0007]

When the motor 1 is energized, the motor 1 rotates the eccentric cam 6 through the speed reducer 4, and the eccentric cam 6 passes through the drive hole 7 of the movable blade 5 when the motor 1 is energized. And swings the tip of the movable blade 5. At this time, since the support pin 8 of the fixed blade 3 and the support hole 9 formed by the elongated hole of the movable blade 5 are fitted to each other, when the drive hole 7 of the movable blade 5 is circularly moved by the eccentric cam 6, the movable blade 5 is moved. While swinging around the support pin 8, the back-and-forth movement is performed along the elongated hole of the support hole 9.

Therefore, the movable blade 5 is different from the cutting blade of the fixed blade 3.
The cutting blade of No. does not cut by pushing the sandwiched grass, but the movable blade 5 moves backward or forward to cut the grass sandwiched between the cutting blades. Even with 3 or the movable blade 5, the lawn can now be reliably mowed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described with reference to the drawings showing embodiments. 1 is a motor, 2 is a frame of an electric lawn mower, 10 is an operation switch for controlling the motor 1, 11 is a power cord, and the frame is Operation switch 10 provided on the handle 2a of the second
The motor 1 is turned on and off by pushing the operating lever 10a for switching the electric lawn mower.

4 is a speed reducer mounted on the rotary shaft of the motor 1,
Reference numeral 12 denotes a reduction gear base to which gears constituting the reduction gear 4 are attached. The motor 1 is attached to the reduction gear base 12, and the reduction gear base 12 has a simple structure in which a drive mechanism can be integrated. Reference numeral 3 denotes a fixed blade which also serves as a bottom plate of the frame body 2, 5 denotes a movable blade which overlaps and supports the fixed blade 3, and 8
Is a support pin penetrating the support hole 9 of the movable blade 5, and the movable blade 5 is movably integrated with the fixed blade 3 by the support pin 8.

Reference numeral 6 denotes an eccentric cam provided in the final gear of the reduction gear 4, 7 denotes a drive hole provided in the movable blade 5, and the eccentric cam 6 is provided in the drive hole 7 of the movable blade 5 supported integrally with the fixed blade 3. When the fixed blade 3 is fitted to the frame body 2 with a screw, the reduction gear base 12 is sandwiched between the frame body 2 and the fixed blade 3 so that the motor 1 and the reduction gear 4 are framed. The structure is such that it can be easily mounted inside the body 2.

Reference numeral 3a is a fixed blade tip formed by the tip of the fixed blade 3, and 5a is a movable blade tip formed by the tip of the movable blade 5,
When the motor 1 rotates, the eccentric cam 6 rotates via the speed reducer 4, and the movable blade 5 swings around the support pin 8. Therefore, between the cutting blade of the movable blade tip 5a and the cutting blade of the fixed blade tip 3a. You can mow the lawn with the grass in between.

According to the present invention, the driving hole 7 fitted into the eccentric cam 6 has the same round shape as the cam shape, and the support hole 9 fitted into the support pin 8 is long from the driving hole 7 in the cutting edge direction. When the eccentric cam 6 rotates, the movable blade 5 continuously moves back and forth and oscillates left and right, so that the back and forth movement is performed along the long hole of the support hole 9 and left and right. The swing is performed with the support pin 8 as the center of rotation.

Therefore, when the eccentric cam 6 rotates 90 degrees from the start position of the movable blade 5 indicated by the alternate long and short dash line in FIG. 1, the movable blade edge 5a moves to the solid line position of the movable blade 5 indicated by the solid arrow.
The tip of the blade moves, and compared with the conventional cutting of grass by simple swinging, which is indicated by the dotted arrow, one cutting edge cuts the grass while sliding against the other cutting blade. Compared with the case of pressing the grass located between two cutting blades at once, the sandwiched grass is cut so as to rub against one of the cutting blades, so that the fixed blade 3 and the movable blade 5 are worn away and the cutting blade is cut. Even if it is dull, the grass can be cut reliably.

[0015]

[Effect] According to the present invention having the above-described structure and action, the movable blade 5 swings while moving back and forth with respect to the fixed blade 3 to cut grass, so that the movable blade 5 is pressed against the fixed blade 3. With the conventional structure of cutting, the problem that grass that often occurs is bent and falls between the fixed blade 3 and the movable blade 5 to make it impossible to cut is very unlikely to occur.

Therefore, even when the cutting blade is worn and cannot be cut by the conventional structure, lawn mowing can be comfortably performed, and the number of times of polishing the fixed blade 3 and the movable blade 5 can be reduced. It is an extremely practical invention.

[Brief description of drawings]

FIG. 1 is a plan view showing a state of a cutting edge integrally holding a fixed blade and a movable blade according to the present invention.

FIG. 2 is a sectional view of an electric lawn mower according to the present invention.

[Explanation of symbols]

 1 Motor 2 Frame 3 Fixed Blade 4 Reducer 5 Movable Blade 6 Eccentric Cam 7 Drive Hole 8 Support Pin 9 Support Hole

Claims (1)

[Claims] 1. A frame 2 containing a motor 1, a fixed blade 3 also serving as a bottom plate fixed to the frame 2, a speed reducer 4 attached to a rotary shaft of the motor 1, and a fixed blade 3 overlappingly supported. In an electric lawn mower having a movable blade 5 whose blade edge is swung, and an eccentric cam 6 which is attached to the speed reducer 4 to swing the movable blade 5, the movable blade 5 is fitted with the eccentric cam 6. Is provided with a driving hole 7, and the fixed blade 3 is provided with a support pin 8 for superposing and supporting the movable blade 5, and the movable blade 5 is fitted with the support pin 8.
The supporting hole 9 of the movable blade 5 is formed as an elongated hole looking in the direction of the cutting edge from the driving hole 7, and the cutting edge of the movable blade 5 which is swung by the eccentric cam 6 moves back and forth along the supporting hole 9 to form the cutting edge of the fixed blade 3. An electric lawn mower characterized by meshing.