Asymmetrical spades

Abstract

Soil cultivation implement, comprising a spade blade (2) and a shaft attached thereto in which a wooden handle is fitted and which has a handle at the free end, wherein the axis of rotation runs laterally to the side of the spade blade, characterized in that the asymmetrical spade blade (2) has a side cutter with a curved shape, on which a removable tip (1) provided with a detachable connecting assembly is arranged, wherein the asymmetrical spade blade (2) has in the lower area of ​​the socket a bore with a thread for fixing the tip (1) during use of the spade and for fixing a locking screw (6) when the spade is not in use.

Description

The invention relates to a spade and similar soil cultivation implements according to the preamble of claim 1. The spade is one of the most frequently used garden tools, used to dig up soil. A spade typically consists of a blade with an attached shaft into which a wooden handle is fitted. At its free end, it has a knob, handle, or similar feature. In the prior art, US 4,135,700 A describes a lawn weeding machine in which the weed-lifting tine is pushed downwards by the foot at a right angle from one end of the ground, engaging in the lower lifting lever, and is driven into the ground next to the weed by pressure of the foot on the upper end of the tine end of the lifting arm, and with a pivot structure, a curved handle extending upwards from the rear end of the lifting arm to the waist of the user, and a strut hanging down from the upper end of the handle to the lower lifting arm to form a complete square handle. WO 95 / 30 516 A1 discloses a device for performing manual work with a tool part and a handle part firmly connected to it, wherein the force is introduced by an operator into the handle part via a grip area and is transferred from the handle part into the tool part for lifting or lowering the load loaded on the tool part, wherein the grip area is arc-shaped and extends substantially in a plane that corresponds to the plane of the force directions when lifting and lowering the load. The purpose of the invention is to enable relatively easy digging of the soil without great effort, compared to a conventional spade. The advantage of the asymmetrical spade lies in the relocation of the pivot point from the center of the blade to the side. This, in conjunction with the wide handle, requires less force when turning the soil. Additionally, a spike at the end of the asymmetrical spade secures the tool in the ground. The side cutter is designed to facilitate easier cutting of the soil. Furthermore, the branch at the handle ensures safe transport and more compact storage. The threaded hole at the socket serves to attach the spike with the same thread, thus also making transport safer, as the spike no longer protrudes. The invention relates to a soil cultivation implement comprising a spade blade and a shaft attached thereto, in which a wooden handle is fitted and which has a handle at the free end, wherein the axis of rotation runs laterally to the side of the spade blade, characterized in that the asymmetrical spade blade has a side cutter with a curved shape, on which a removable tip is arranged with a detachable connecting assembly, wherein the asymmetrical spade blade has a threaded bore in the lower region of the socket, which serves to fix the tip during use of the spade and to fix a locking screw when the spade is not in use.

[0003] Due to the asymmetrical shape of the spade blade in relation to the axis and the long lever, the muscles of the lower back are not strained or overworked. Furthermore, the tool is simple and practical.The absence of complicated and unnecessary mechanisms, combined with people's need for comfortable tools, makes this spade an economically advantageous product. In particular, the tool is suitable for people with back problems. In a preferred embodiment of the soil cultivation device, the spade handle has a branch which, using a T-shaped bracket, serves to fix the horizontal handle and allows an optimal angle to the asymmetrical spade blade in the range of 35 degrees to 55 degrees. A preferred embodiment of the invention is described below with reference to the drawings. These show: Fig. 1 on sheet 1 shows a threaded tip; Fig. 2a, Fig. 2b, Fig. 2c on sheet 2 shows an asymmetrical spade blade; Fig. 3 on sheet 3 shows a spade handle with a branch; Fig. 4a, Fig. 4b on sheet 4 shows a T-bracket; Fig. 5 on sheet 5 shows a horizontal handle. The asymmetrical spade is drawn in front, side and top view on sheets 6, 7 and 8. Sheet 9 shows the view of the tool during transport and storage. Sheet 10, Main Views of the Components, is attached as an addendum. The operating principle is further explained on page 11 and described in pictures. The asymmetrical spade consists of 5 basic components: Threaded tip (1), Asymmetrical spade blade (2), Spade handle with branch (3), T-holder (4), Horizontal handle (5) Threaded tip (1) The threaded point (1) is 70 mm to 150 mm long and has a diameter of 12 mm to 13 mm. It is a round metal piece (made of stainless steel) with a pointed end. To prevent injury, the point (1) is slightly blunted by 0.5 mm to 1 mm. The top side has an M10 or M11 thread, 10 mm to 15 mm long. The point (1) is screwed onto the asymmetrical spade blade (2) via this thread (M10 or M11). A spring washer is clamped between the thread and the point. When the asymmetrical spade is in use, the point (1) remains in the ground, allowing the spade to rotate on its own axis. Asymmetrical spade blade (2) The special feature lies in the shape of the asymmetrical spade blade (2). The spade blade (2) can be bent from 0 mm (unbent) to 30 mm (Fig. 2c, top view). It has a width of 220 mm to 320 mm, a height of 250 mm to 350 mm, a material thickness of 1-3 mm, and a symmetrical triangular notch within the sheet metal in the lower part, which is 15 mm to 30 mm high. The width of the notch corresponds to the width of the spade blade (2). The footplate (13) is located in the upper part of the spade blade (2) at a 90-degree angle to the blade, as with a conventional spade. The length of the step (13) ranges from 10 mm to 20 mm. One of the most important parts of the spade is the so-called side cutter (14), which can also be referred to as the side blade. The side blade is a curved part of the blade (2), set at a 90-degree angle on one side of the spade blade (2) in the shape of an odd trapezoid. The longest side of the trapezoid ranges from 100 mm to 170 mm, the opposite side is 25 mm to 55 mm long, and the height is 70 mm to 100 mm. The cutting edge of the trapezoid is at an angle of 60 degrees to 80 degrees to the longest side. The side blade can also be manufactured separately and then welded to the main spade blade (2). The axle tube (15) is located on the opposite side from the side cutter (14). The axle tube (15) is a component of the asymmetrical spade blade (2). This part is turned into a tube and welded to the spade blade (2). The axle tube (15) has a length of 180 mm to 280 mm, a diameter of 13 mm, and a thickness equal to that of the spade blade. The lower part of the axle tube (15) has an M10 or M11 thread (thread length 17 mm). This thread is used to screw in the tip (1) or the locking screw (6). Alternatively, the axle tube (15) can also be manufactured separately from a piece of tubing and then welded to the main spade blade (2). The upper part of the axle tube (15) has a conical taper (16). The taper (16) is a twisted sheet metal piece in a cone shape.The height ranges from 50 mm to 100 mm, the material thickness from 2 mm to 3 mm, the diameter of the narrow end is 13 mm to 15 mm, and the diameter of the wider end is between 30 mm and 50 mm. A conical reducer (taper (16)) is a connecting element that joins the parts of the asymmetrical spade together. The taper (16) is welded to the axle tube (15) at the narrower end and laterally to the asymmetrical spade blade (2), as well as to the socket (17) at the wider end. The socket (17) is a tube. It serves to connect the asymmetrical spade blade (2) to the spade handle (3) and to adjust the desired spade length depending on the user's height. The length of the socket (17) is 200 mm to 350 mm, the material thickness is 0.75 mm to 2 mm, and the diameter is 30 mm to 50 mm. The socket (17) has four through holes, each with a diameter of 5 mm to 10 mm. The distance between the holes is 30 mm to 50 mm. The distance from the first hole to the upper edge is also 30 mm to 50 mm. These holes can be drilled either parallel or perpendicular to the asymmetrical spade. They serve to connect the asymmetrical spade blade (2) and the spade handle (3) and to determine the required length of the tool. In the lower part of the socket (17), parallel to the spade blade (2), there is another bore 15 mm from the lower edge of the socket (17). This bore is threaded with M10 or M11. The locking screw (6) or the tip (1) is stored in this bore. spade handle with branch (3) The spade handle (3) is a tube made of light metal, for example, aluminum. The length of the spade handle (3) can be between 600 mm and 900 mm. The diameter of the main tube is 26 mm to 45 mm. The handle (3) has two through holes in its main section, which are intended for attachment to the (2) and (4). Their diameters correspond to the inner diameter of Fig. 2a (socket (17) at the top) and the outer diameter of Fig. 4a (vertical tube). The hole intended for attaching Fig. 4a is drilled at an angle of 45 degrees to the hole (lower part of the spade handle (3)) for attachment to Fig. 2b. These holes are positioned 15 mm to 30 mm from the edges. The branch on the spade handle (3) is intended for securing Fig. 4a and, consequently, Fig. 5 during transport and storage of the tool. The branch of the spade handle (3) is made of a light metal, such as aluminium. The dimensions of the branch: the length, starting from the cutout (recess), can be 20 mm to 30 mm. This spade handle (3) can also be made of wood. However, another suitable material can also be used. The radius of the cut is equal to the outer radius of the spade handle (3), and the diameter of the branch is equal to the inner diameter of the vertical tube of the T-shaped part, minus 1 mm. A hole is drilled into the branch perpendicular to the spade handle, which is 1 mm larger than the diameter of the hole in the T-shaped holder (4). The hole is located 10 mm or 15 mm from the cut edge. The branch is welded approximately 295 mm from the top edge of the spade handle (3) (tube), so that the branch is located towards the spade blade (2) (parallel to the spade blade (2)). T-bracket (4) The T-shaped bracket (4) consists of two vertically welded metal tubes, one horizontal and one vertical. The horizontal tube serves to attach the horizontal handle (5). Its length ranges from 70 mm to 150 mm, its diameter from 30 mm to 45 mm, and its thickness from 1 mm to 3 mm. The vertical tube serves to attach the T-shaped bracket (4) to the spade handle (3). The dimensions of this component are as follows: the length of the cutout can be from 30 mm to 70 mm, the radius of the cutout is equal to the outer radius of the horizontal tube, and the diameter is equal to the inner diameter of the spade handle (3) (tolerance range - 0.1 mm to -0.5 mm). The vertical metal tube contains a bore which lies perpendicular to the longitudinal axis of the horizontal tube. This hole can be located at a distance of 20 mm to 50 mm from the lower edge of the recess in the vertical tube. An additional hole of approximately 3 mm on the T-shaped bracket (4) is intended for securing the nose bolt with a rope / chain. Horizontal handle (5) The horizontal handle (5) is a pivoting lever of the asymmetrical spade. While the horizontal handle (5) is made of wood, it can also be made of light metal, such as aluminum. The horizontal handle (5) has a length of 500 mm to 900 mm, the diameter of the central section ranges from 30 mm to 45 mm, and its length ranges from 150 mm to 250 mm. The tapered section on both sides has a length of 50 mm to 150 mm. The diameter of the end sections ranges from 20 mm to 40 mm. The special features of the horizontal handle (5) are its stable central section and comfortable grip. The horizontal handle (5) is fixed in the T-shaped bracket (4) by means of a pan head screw (11). And additional components: Plug screw (6) The M10 or M11 plug screw protects the threaded holes of the asymmetrical spade blade (2) from damage and clogging. Wing screw (7), wing nut (8), two washers (9) Threads from M6 to M9 are intended for use with the wing screw (7) and the wing nut (8); the length depends on the outer diameter of the socket (17) of the asymmetrical spade blade (2). Suitable washers (9) are used to fasten the asymmetrical spade blade (2) to the spade handle (3). Alternatively, a hex bolt or a socket head cap screw can be used for fastening. Toggle bolt with ring (10) or similar fastening material The toggle bolt (10) with nose is intended for fastening the T-shaped bracket (4) to the spade handle (3).The length and diameter depend on the diameter of the spade handle (3) and the hole drilled in the handle (3), as well as in the T-shaped bracket (4). A hexagonal screw or a socket head cap screw can also be used for fastening. The spade is easy to assemble and disassemble. It can be quickly and easily converted from its working state to a compact form for transport or storage. Furthermore, various sizes, from an asymmetrical spade blade (2) to a horizontal handle (5), can be adjusted depending on the user's height. The tool's function is fundamentally simple. Before using the asymmetrical spade, preparation with a conventional spade is recommended. Using the conventional spade, an L-shaped area is dug to define the boundaries for the subsequent digging with the asymmetrical spade.This leads to easier and more effective use of the asymmetrical spade (Fig. 10). Digging with the asymmetrical spade begins at the corner of the L-shape, so that the excavated soil can be placed into the previously dug furrow (Figs. 11, 12, 13 to 14). Now, as with a conventional spade, the asymmetrical spade blade (2) is pressed into the soil using the foot (Figs. 11 and 13). Simultaneously, the horizontal handle (5) is rotated clockwise by approximately 90 degrees using the hands. The horizontal handle (5) is set at a 45-degree angle to the asymmetrical spade blade (2) and transmits the energy to the T-shaped bracket (4) and the spade handle with branch (3). The spade handle with branch (3) transmits the rotational movement to the axis of rotation of the asymmetrical spade blade (2), which enables the digging out of the earth and tipping it into the prepared furrow Fig. 12 and Fig. 14 .The tip with the thread (1) is provided to maintain the rotational movement around the axis (tip-axis tube-stem). The tip (1) is inserted into the ground. Description of the assembly and disassembly of the asymmetrical spade: No additional tools are required for assembling and disassembling the asymmetrical spade, as hand-tightening is sufficient. The asymmetrical spade is delivered to the customer disassembled. To assemble it, the spade handle (3) is attached to the T-shaped bracket (4) and the hinged bolt (10). The spade handle (3) is then connected to the socket (17) of the asymmetrical spade blade (2) using the wing nut (7) and wing screw (8), depending on the user's height. The locking screw (6) is unscrewed from the axle tube. The threaded tip (1) is then unscrewed from the socket (17) and hand-tightened into the M10 or M11 hole on the axle tube (15). The locking screw (6) is then hand-tightened into the hole on the socket (17). The inventor produced a prototype and tested it in the garden. The test results suggest that, due to the reduced fatigue experienced by the worker, it is possible to increase productivity compared to the effort required with a conventional spade. Reference symbol list 1 Threaded tip 2 Asymmetrical spade blade 3 Spade handle with branch 4 T-bracket 5 Horizontal handle 6 Hex socket locking screw 7 Wing screw 8 Wing nut 9 Washers 10 Folding nose bolt with ring and rope 11 Pan head screw 12 Spade blade 13 Footplate 14 Side cutters 15 Axle tube 16 Tapered end 17 Socket

Claims

Soil cultivation implement, comprising a spade blade (2) and a shaft attached thereto in which a wooden handle is fitted and which has a handle at the free end, wherein the axis of rotation runs laterally to the side of the spade blade, characterized in that the asymmetrical spade blade (2) has a side cutter with a curved shape, on which a removable tip (1) provided with a detachable connecting assembly is arranged, wherein the asymmetrical spade blade (2) has in the lower area of ​​the socket a bore with a thread for fixing the tip (1) during use of the spade and for fixing a locking screw (6) when the spade is not in use. Soil cultivation device according to claim 1, characterized in that the spade handle (3) has a branch which, using a T-shaped holder (4), serves to fix the horizontal handle and enables an optimal angle to the asymmetrical spade blade (2) in the range of 35 degrees to 55 degrees.

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