JP3114243U - Rechargeable mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To charge a grass mower more easily while maintaining the advantage of this kind of mower that it is lightweight and can be charged with a household power source, as well as replacing the cutting blade easily. To provide a type mower.
SOLUTION: A shaft 10 having a handle 11 at one end, a cutting blade unit 20 attached to the other end of the shaft 10, and a power supply unit having a power switch 32 incorporated in the handle 11 are provided. In a mower where the electric motor is connected to the power supply unit by a power cable, the shaft is configured to be extendable and fixed, and the power cable is configured to be extendable in accordance with changes in the overall length of the shaft.
[Selection] Figure 1

Description

  The present invention relates to a rechargeable mower particularly suitable for use in general households.

  This type of mower includes a shaft having a handle at one end, a cutting blade unit attached to the other end of the shaft, and a power supply unit having a power switch incorporated in the handle, and the electric motor of the cutting blade unit is a power supply unit. Those that are connected by power cables are already offered to the market.

  This mower is lightweight because the shaft and frame of the blade unit are made of aluminum pipe or synthetic resin, and it uses a rechargeable battery that can be charged with commercial 100V, so it can be charged with a household power supply, Since the blade is made of synthetic resin and can be replaced relatively easily, it is widely used mainly as a light mower for home use.

  However, since this mower has a fixed shaft length, for example, if the worker's height is large, he / she must work in a crouched posture, and in addition to the mowing work, the physical burden is strong. May be. On the other hand, if the length of the shaft is too long for the user, it is difficult to use as well.

  In addition, in the known rechargeable mower, in order to satisfy that the blade is easy to replace and that the blade does not come off during use, the structure and form of the blade mounting hole and the blade mounting portion become complicated, As a result, the ease of replacing the blade tends to be impaired.

  In view of the above points, the present invention is lightweight and can be charged with a household power supply, and of course, the mowing operation can be performed while maintaining the advantages of this type of mower that the cutting blade can be easily replaced. It is an object of the present invention to provide a rechargeable mower that can perform the operation more easily.

  The configuration of the mower according to the present invention, which has been made for the purpose of solving the above problems, includes a shaft having a handle at one end, a cutting blade unit attached to the other end of the shaft, and a power supply unit having a power switch incorporated in the handle. A mowing machine in which the electric motor of the cutting blade unit is connected to the power supply unit by a power cable, the shaft is configured to be able to extend and contract, and the power cable is configured to be able to expand according to changes in the overall length of the shaft. It is characterized by being.

  The cutting blade unit of the mower includes a turntable for detachably holding the blade, and has a mounting boss for the blade at the center of the turntable, and the blade is fitted around the mounting boss on the turntable. A concave groove portion having substantially the same width as the round blade, a lateral groove portion where the blade is formed at a point-symmetrical position on both side walls of the concave groove portion, and a blade contact protrusion provided at a position facing the lateral groove portion with the width of the blade Part.

  A more specific configuration of the inventive mower is that the shaft is divided into an upper shaft on the handle side and a lower shaft on the cutting blade unit side, and the lower shaft has a block body fitted to the upper end thereof. The upper shaft includes a through hole that is slidably fitted to the lower shaft including the block body and is disposed in the wall surface at an appropriate pitch, while the block body protrudes from the through hole and the upper shaft. It has a convex stopper that protrudes from and retracts into the position where it is retracted, and an insertion part through which the power cable passes.

  This invention mower has a shaft that can be expanded and contracted, and the power cable can be expanded according to changes in the overall length of the shaft, and the shaft can be expanded and contracted to match the height of the user. It is possible to perform mowing work easily for a long time without forcing an unreasonable posture such as a person bending over. In addition, since the cutting blade can be easily replaced and there is no possibility of the cutting blade dropping off during use, it is convenient and safe.

  Hereinafter, an embodiment of the mower according to the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, FIG. 1 is a perspective view showing the overall configuration of the mower of the present invention, FIG. 2 is an enlarged perspective view showing the configuration of the shaft, and FIG. 3 is a longitudinal sectional view of the shaft along the line 3-3 in FIG. 4 is a cross-sectional perspective view of the shaft along line 4-4 in FIG. 3, and FIG. 5 is a bottom view showing the mounting state of the cutting blade as seen from the arrow 5 in FIG.

  The inventive mower has a shaft 10 as shown in FIG. The shaft 10 is made of a hollow pipe and has a handle 11 at the upper end. A cutting blade unit 20 is attached to the lower end of the shaft 10, and a power supply unit (not shown in the figure) mainly including a rechargeable battery is incorporated in the handle 11.

  The cutting blade unit 20 has a small electric motor (not shown) incorporated in the main body 21. The main body 21 is fitted and fixed to the shaft 10. A ring-shaped guard 21 a made of a soft plastic material is attached to the side surface of the main body 21. A turntable 22 is disposed on the lower surface of the main body 21. The turntable 22 is fixed to a rotating shaft of an electric motor incorporated in the main body 21 and rotates integrally with the shaft. As shown in FIG. 5, a concave groove 27 having substantially the same width as the blade 23 (a width in which the blade fits) is formed on the lower surface of the turntable 22, and the blade 23 is detachably attached to the turntable 22.

As shown in FIG. 5, the blade 23 has a two-propeller (or bamboo dragonfly) shape, and the blade portion 24 is formed by gradually thinning the meat from the center toward both side edges. The mounting on the turntable 22 is performed by positioning the center mounting hole 25 into the center mounting boss 26 of the turntable 22 while being positioned in the concave groove 27. The details are as follows.
That is, around the mounting boss 26, a concave groove 27 having substantially the same width as the blade into which the blade 23 is fitted, and a lateral groove portion 28a into which the blade 23 formed at point-symmetrical positions on both side walls of the concave groove 27 enters. And a blade contact projection 28b provided at a position facing the lateral groove 28a with the width of the blade 23. The blade 23 having the hole 25 fitted in the boss 26 is fixed by fixing the blade 23 in FIG. From the chain line state (fitted in the groove 27) to the solid line state, rotate clockwise on the boss 26, and one side edge of the blade 23 is fitted into the lateral groove 28a on the side wall of the groove 27, opposite This is done by abutting the side edge against the side surface of the contact protrusion 28b.

  To replace the blade 23, stop the electric motor, hold the turntable 22 with your hand, lift the blade 23 slightly away from the contact projection 28b, and rotate it counterclockwise around the boss 26 from the solid line position to the chain line position. , The side edge of the blade 23 is removed from the laterally recessed groove 28a, and the original blade 23 is removed from the boss 26. The new blade 23 is attached and fixed to the turntable 22 by operating in the reverse order to the blade removal described above.

  As shown in FIG. 1, the power supply unit includes a rechargeable battery 31, a power switch 32 that disconnects and connects the motor and the rechargeable battery, and the rechargeable battery 31 is connected to the motor via the power switch 32. ing. As shown in FIG. 3, the connection is made by a curled cord 33 and a linear constant length cord 34. In addition, the rechargeable battery 31 is accommodated in a storage chamber in the handle 11 and is put in and out through a door (not shown) on the rear surface of the handle.

  The shaft 10 includes an upper shaft 12 and a lower shaft 13. The handle 11 is fixed to the upper end of the upper shaft 12. As shown in FIG. 3, a block body 40 is disposed between the upper shaft 12 and the lower shaft 13.

  The block body 40 has a large diameter portion 41 having an outer diameter corresponding to the inner diameter of the lower shaft 13 and a small diameter portion 42 having the same diameter as the lower shaft 13. The small diameter portion 42 is fitted and fixed to the upper end of the lower shaft 13. The lower shaft 13 is increased in length inside the upper shaft 12 by the block body 40, and the upper shaft 12 is slidably fitted to the large-diameter portion 41 and the lower shaft 13 of the block body 40, and has a large slide length. Has been granted.

  A convex stopper 43 is incorporated on the peripheral surface of the small diameter portion 42 of the block body 40. The upper shaft 12 is provided with through holes 45 at intervals in the axial direction, for example, at regular intervals. As shown in FIG. 4, the convex stopper 43 is inserted into a recess 44 provided in the small-diameter portion 42 via an elastic body 46 such as a coil spring, and is projected from the lower shaft 13 by a collar 47. While being prevented from being pulled out, it is moved down through the through hole 48 of the lower shaft 13 and the through hole 45 of the upper shaft 12 and protrudes from the peripheral surface of the upper shaft 12 and the elastic body 46. It is possible to move between positions retracted into the lower shaft 13.

  Further, the block body 40 is provided with an insertion portion 49 through which the curl cord 33 and the fixed length cord 34 have a shape of a through hole or a notch. One end of the curl cord 33 is connected to the power switch 32, the other end is fixed to a relay part (not shown) in the block body 40, and the intermediate part is passed through the insertion part 49 of the upper shaft 12. The fixed length cord 34 has an intermediate portion passed through the insertion portion 49 of the lower shaft 13, one end is electrically connected to the curl cord 33 by the relay portion, and the other end is connected to the electric motor.

  In this mower, when the handle 11 is grasped by hand and the power switch 32 is pressed, the electric motor of the cutting blade unit 20 is operated, and the blade rotates to perform mowing. In the inventive mower, the height of the handle 11 can be adjusted to the height of the user by changing the length of the shaft 10 at this time. To adjust the length of the shaft 10, the convex stopper 43 is pushed down, the upper shaft 12 is slid, the convex stopper 43 is protruded from another through hole 45, and the length is changed to the shaft 10 according to the height of the user. Can be done.

  For this reason, the worker is not forced to work in a bent posture, the work load is remarkably reduced, and the work can be performed easily and in a short time. Moreover, even if the large-diameter portion 41 of the block body 40 carries the upper shaft 12 together with the lower shaft 13 and the shaft 10 is fully extended, the rigidity is high, so that the work can be performed stably. The work is finished by pressing the power switch 32 again to stop the motor. At this time, the convex stopper 43 is pushed and the upper shaft 12 is pushed, so that the total length of the shaft 10 is shortened and the mower is cut. Because it is downsized, you can choose a storage location.

  In addition, the mower according to the present invention can be changed in length only by inserting the block body 40 into the lower shaft during manufacture. The overall length of the shaft 13 can be shortened, and the manufacturing cost can be reduced. Furthermore, by using a material having a small coefficient of friction with the upper shaft 12 for the block body 40, the shaft 10 can be smoothly expanded and contracted over a long period of time.

  In the embodiment described above, the power supply unit and the block body 40 are electrically connected by the curl cord 33, but a straight cord having a length corresponding to the expansion and contraction of the upper shaft 12 is used. Changes and modifications can be made without departing from the scope.

The perspective view which shows the whole structure of this invention mower. The expansion perspective view which shows the structure of a shaft. The longitudinal cross-sectional view of the shaft which follows the 3-3 line of FIG. FIG. 4 is a cross-sectional perspective view of the shaft along line 4-4 in FIG. 3. The bottom view which shows the mounting state of the cutting blade seen from the arrow 5 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shaft 11 Handle 12 Upper shaft 13 Lower shaft 20 Cutting blade unit 21 Cutting blade unit main body 22 Turntable 23 Blade 24 Blade portion 25 Mounting hole 26 Boss 27 Recessed groove portion 28a Lateral groove portion 28b Abutting protrusion portion 31 Rechargeable battery 32 Power switch 33 Curled cord 34 Constant length code 40 Block body 41 Large diameter portion 42 Small diameter portion 43 Convex stopper 44 Recess 45 Upper shaft through hole 46 Elastic body 47 Brim 48 Lower shaft through hole 49 Cord insertion portion

Claims (5)

It has a shaft with a handle at one end, a cutting blade unit attached to the other end of the shaft, and a power supply unit with a power switch built into the handle, and the electric motor of the cutting blade unit is connected to the power supply unit by a power cable. In the mower
A rechargeable mower characterized in that the shaft is configured to be extendable and fixable, and the power cable is configured to be extendable according to changes in the overall length of the shaft.   The cutting blade unit includes a turntable for detachably holding the blade, has a mounting boss for the blade at the center of the turntable, and is substantially a blade that fits the blade around the mounting boss on the turntable. A concave groove portion having the same width, a lateral groove portion into which the blade is formed at a point-symmetrical position on both side walls of the concave groove portion, and a blade contact protrusion provided at a position facing the lateral groove portion with the width of the blade. The mower according to claim 1.   The shaft is divided into a plurality of parts, and one shaft has a block body fitted to the end thereof, and the other shaft is slidably fitted to one shaft and the block body. 2. The wall includes through holes arranged at appropriate pitches, and the block body includes a convex stopper protruding and retracting between the through hole and the inside of the shaft, and an insertion portion through which a power cable passes. Or the mower according to 2.   The shaft is divided into an upper shaft on the handle side and a lower shaft on the cutting blade unit side, and the lower shaft has a block body fitted to the upper end thereof, and the upper shaft is a lower shaft including the block body. Convex shape that is slidably fitted and has through holes arranged on the wall surface at an appropriate pitch, while the block body protrudes and retracts between a position protruding from the through hole and a position retracting into the upper shaft The mower according to claim 3, further comprising a stopper and an insertion portion through which the power cable is passed. The mower according to claim 4, wherein the power cord is composed of a curl cord disposed inside the upper shaft and a constant length cord disposed inside the lower shaft.

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