Universal electric mower. Drawing, description

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Universal electric mower. Tips for the home master

Builder, home master

Once upon a time I worked as a mechanic for gardening machines, or simply gasoline lawn mowers. Often it was necessary to cut grass and shrubs in inconvenient places and in limited areas. And the existing braids and large hand scissors are not well adapted for this kind of work. So I decided to make my work easier - to come up with a portable hand tool for cutting bushes, flower beds and lawns. He took an interest in domestic and foreign experience in the construction of such mechanisms, sketched several sketches of mowers with various drives, including electric ones. However, it was far from the implementation of the idea: either one node did not suit, then another.

Finally, after a long search, I got an electric mower, which, it seems to me, compares favorably with similar ones by the versatility of the design and can be used to cut not only the edges and inconveniences on lawns, but also bushes. He called it EKU-1: electric mower, universal, first. Here are some of its features.

Universal electric mower
Rice. 1. Options for using EKU-1: 1, 2, 3 - mowing grass near the walls of buildings, between bushes, on slopes, 4 - decorating the crowns of shrubs.

First of all, lightness, weight - 1,3 kgf. This is of great importance when processing shrubs, because the tool has to be kept on weight for hours. The bar-handle is made "breakable", which allows you to change the position of the knife depending on the working conditions and the relief of the cut surface.

EKU-1 is arranged simply: a casing is attached to the electric motor with a cutting element at the end of the shaft, and a long rod-handle is attached to the casing. The DPM-35 type motor is designed for direct current 24 V, its power is 72 W, the shaft speed is 9000 rpm. A similar one is used on some brands of transistor portable tape recorders, as well as in automation systems. But you can use electric motors from a coffee grinder or vacuum cleaner. True, it will be necessary to strengthen the insulation, since then the AC network will become the source of power supply, and the weight of the mower will increase to about 3 kgf.

Universal electric mower
Rice. 2. General view of EKU-1: 1 - knife, 2 - dome of the protective cover. 3 - electric motor. 4 - "breaking" device, 5 - handle tube. 6 - switch button and lever, 7 - plug connector, 8 - reverse micro-tumbler, 9 - cable, 10 - protective cover beam

The cutting element (knife) is made of two thin duralumin plates connected with M4 screws. Safety razor blades are inserted between them so that they protrude from the plates by 0,5 mm. This eliminates the breakage of the cutting edge, in addition, the use of blades frees you from constant concern for the sharpness of the knife.

To protect the engine from accidental shock loads, two separate blades can be made hinged to the flange. When manufacturing, you need to carefully balance them, otherwise the mower will quickly fail.

Rice. 3. Layout of the electric mower (click to enlarge): 1 - beam of the protective cover, 2 - razor blade, 3, 10, 13, 18 - M4 screws, 4 - top knife plate, 5 - bottom plate. 6 - knife flange, 7 - nut M4, 8 - motor shaft, 9 - motor, 11 - dome of the protective casing, 12 - motor flange, 14 - gasket. 15 - eyelet. 16 - wing nut M3, 17 - fork. 19 - sleeve, 20 - pipes of the "breaking" device

When the engine is running, the centrifugal force stabilizes the knives in the radial direction, and they easily cut grass, and when they hit a hard object, they deviate back, softening the blow.

From above the knife is closed by a protective casing; it consists of a dome and "beams" made of thin sheet duralumin. The beams that protect the blades from breakage and help mow the stems of plants are connected to the dome with folding petals on epoxy glue. The ends of the beams have protrusions that set the height of the grass cut.

A bar-handle made of a duralumin ski pole is also attached to the casing. At its upper end there is a plug connector, an engine start button and a double reverse micro toggle switch. From them, the wire goes through the pipe to the engine. (In the case of AC power, the handle is made from a plastic ski pole.)

Rice. 4. The design of the "breaking" device (click to enlarge): 1 - fork, 2 - M4 screw, 3 - bushing, 4 - oblique pipe, 5 - holes for the fixing bolt of the initial position, 6 - handle tube, 7 - bolt - intermediate position lock, 8 - pipe-casing, 9 - cable

A fork with a "breaking" device is attached to the lower end of the pipe. Fork with longitudinal stiffening rifts - made of thin sheet duralumin. "Breaking" device - a tube attached to the plug with an M4 screw on epoxy glue. Cutouts are made in it to change the position of the cutting element of the mower. The rod-handle is fixed to the ears of the protective casing with screws with wing nuts.

The figure shows the possible use of a mower with such a handle. It is obvious that another tool would hardly allow to have such reach areas. In addition, a piece of nylon cord or a metal guitar string can be used instead of a knife to cut grass on areas with uneven boundaries.

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