Rotary cutter for lawnmowers

Abstract

A rotary cutter for a lawn mower capable of replacing a grass string, comprising: a grass string that rotates to cut grass; a string storage reel that stores the grass string and pays out the grass string while intermittently rotating; a housing main body that stores the string storage reel; a cover that covers the housing main body; and a pressing body that protrudes from the housing main body, is movable in an axial direction by being pressed, and causes the string storage reel to intermittently rotate. The rotary cutter for a lawn mower includes a flange protruding body that protrudes from a string storage reel flange surface of the string storage reel and has a concave-convex shape on an outer peripheral side, and in a configuration in which the flange protruding body and the string storage reel are stored in the cover during mowing, the concave-convex shape is a shape for rotating the string storage reel by gripping with a finger, and on an outer side of the outer peripheral surface having the concave-convex shape, there is a region in which, when the string storage reel is rotated by gripping the concave-convex shape with the finger, there is no obstacle that interferes with the movement of the finger.

Description

Technical Field

[0001] The present invention relates to a rotary cutter for a lawnmower, which is used to cut grass and the like using a cutting rope (mainly made of nylon) extending in the radial direction of the housing, the cutting rope being driven to rotate via a rotating shaft by power from a prime mover or the like. Background Technology

[0002] Previously, when the straw rope wore out or the straw rope stored in the rope reel was consumed, the rotary cutter needed to be disassembled, the rope reel removed, new straw rope wound, and the components reassembled.

[0003] However, with this method, when disassembling and removing the rope storage reel, related components and other constituent parts of the reel must also be disassembled, which may result in the loss of these components. Therefore, there are rotary cutters that simplify the replacement operation when the straw rope is consumed, and rotary cutters that allow straw rope replacement without assembling and disassembling the rotary cutter. For example, a rotary cutter has been proposed that is configured such that a through hole is provided through the cylindrical part (straw rope winding part) of the rope storage reel, and the straw rope is wound around the cylindrical part of the rope storage reel through the through hole (see Patent Documents 1-3, etc.).

[0004] In addition, the rotary cutters described in these records are complex in construction and expensive to manufacture, and time and effort are spent on inserting and guiding the straw rope when winding it onto the rope reel.

[0005] To solve this problem, a rotary cutter is known that provides grooves on the rope storage reel, simplifying manufacturing and processing, and eliminating the possibility of losing the rope storage reel and related components, and is capable of replacing straw rope (see Patent Documents 4 and 5).

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Utility Model Registration No. 2509199

[0009] Patent Document 2: Japanese Patent Application Publication No. 2005-124501

[0010] Patent Document 3: Japanese Patent Publication No. 2006-514837

[0011] Patent Document 4: Japanese Patent Application Publication No. 2009-207433

[0012] Patent Document 5: Japanese Patent Application Publication No. 2010-29075 Summary of the Invention

[0013] The problem that the invention aims to solve

[0014] However, the above-mentioned prior art has the following problems: as the grass is cut with a rotary cutter, the pressing body gradually wears out, and it becomes difficult to replace the grass cutting rope (by turning it by hand).

[0015] Therefore, the object of the present invention is to provide a rotary cutter that maintains consistent stability in terms of ease of replacement of straw ropes even after long-term use.

[0016] Solution for solving the problem

[0017] The first invention is a rotary cutter for a lawnmower, which is a rotary cutter for a lawnmower with replaceable trimming rope. It is characterized by comprising: a trimming rope that rotates to cut grass or the like; a rope reel that holds the trimming rope and releases it while rotating intermittently; a housing body and a cover, the housing body housing the rope reel and the cover covering the housing body; and a pressing body protruding from the housing body, movable axially by pressing, and causing the rope reel to rotate intermittently. The rotary cutter for a lawnmower has a flange protrusion that protrudes from the flange surface of the rope reel and has a concave-convex shape on its outer peripheral side. The rotary cutter for a lawnmower is constructed such that the flange protrusion and the rope reel are housed within the cover during mowing. The concave-convex shape is a shape for rotating the rope reel by gripping it with a finger. The outer side of the concave-convex shape has a region such that when the rope reel is rotated by gripping the concave-convex shape with a finger, there is no obstruction that hinders the movement of the finger.

[0018] The second invention is a rotary cutter for a lawnmower, characterized in that the flange protrusion of the first invention is provided on the flange of the rope reel by any one of fixing, fastening, or securing.

[0019] The third invention is a rotary cutter for a lawnmower, characterized in that the flange protrusion of the first invention is integrally formed with the flange of the rope reel.

[0020] The fourth invention is a rotary cutter for a lawnmower, which is a rotary cutter for a lawnmower with replaceable trimming rope. It is characterized by comprising: a trimming rope that rotates to cut grass or the like; a rope reel that holds the trimming rope and releases it while rotating intermittently; a housing body and a cover, the housing body housing the rope reel and the cover covering the housing body; and a pressing body protruding from the housing body, movable axially by pressing, and causing the rope reel to rotate intermittently, the pressing body having a concave-convex shape at its upper end.

[0021] Invention Effects

[0022] According to the present invention, a structure is provided in which the flange protrusion and the rope reel are housed within a cover during mowing. The convex and concave shape is a shape that allows the rope reel to be rotated by gripping it with fingers. The outer side of the outer peripheral surface with the convex and concave shape has a spatial region that does not cause rotational obstruction when the rope reel is rotated by gripping the convex and concave shape with fingers, thereby facilitating manual operation. The rope reel flange does not wear out during mowing because it is housed within the cover, thus maintaining the replaceability of the mowing rope even during long-term mowing operations.

[0023] In addition, because it is not easy for debris to accumulate inside the pressing body, a stable pressing action can be obtained.

[0024] Moreover, the above-mentioned scheme also has the effect of increasing the design freedom of the pressing body. Attached Figure Description

[0025] Figure 1 This is an external view showing the rotary cutter for lawnmowers according to the present invention.

[0026] Figure 2 This is an external view of the first embodiment of the rope reel 3 when the cover 2 of the rotary cutter for lawnmowers described above is removed.

[0027] Figure 3 yes Figure 2 A-A sectional view.

[0028] Figure 4 This is a side view showing the structure of the rope reel of the present invention. Figure 4 (a) is a rope storage reel having a flange protrusion with a concave-convex shape on the upper part of the rope storage reel flange. Figure 4 (b) is a rope storage reel having flange protrusions with concave and convex shapes on the upper and lower parts of the rope storage reel flange.

[0029] Figure 5 (a)~ Figure 5 Figure (c) is a diagram illustrating another embodiment of the rotary cutter for a lawnmower according to the present invention. Figure 5 (a) is a cross-sectional view of another embodiment of a rotary cutter for a lawnmower. Figure 5 (b) is an external view showing the gap of the pressing body. Figure 5 (c) is a perspective view of a press body having a concave-convex shape protruding upward from the surface of the upper end.

[0030] Figure 6 This is a perspective view of the pressing body of another embodiment of the rotary cutter for lawnmowers of the present invention, which has a pressing body with a concave-convex shape protruding upward from the surface of the upper end.

[0031] Figure 7 This is a perspective view of the pressing body of another embodiment of the rotary cutter for lawnmowers of the present invention, which has a pressing body with a concave-convex shape protruding upward from the surface of the upper end. Detailed Implementation

[0032] Figures 1-3 This illustrates an embodiment of the rotary cutter for lawnmowers according to the present invention. Figure 1 This is an exterior view. Figure 2 This is an explanatory diagram showing its internal structure with cover 2 removed. Figure 3 yes Figure 2 The A-A sectional view shows the rotary cutter, 1 is the outer shell (main body), 2 is the cover, 3 is the rope reel, 31T is the upper part of the rope reel flange, 31U is the lower part of the rope reel flange, 3-1 is the concave-convex shape of the protruding body of the rope reel flange, 4 is the pressing body, 8 is the straw rope guide, 9 is the straw rope, and S is the area without obstacles that hinder the movement of the fingers.

[0033] Therefore, firstly Figures 1-3 The construction of a rotary cutter for a lawnmower, as shown in one embodiment of the present invention, will be described.

[0034] The rotary cutter RC for the lawnmower in this embodiment is designed to release the cutting rope by striking the rotary cutter (pressing body). Its construction involves a rope reel 3, which is integrally or separately equipped with a bottomed cylindrical pressing body 4, and is assembled to the center of the housing 1 such that the pressing body 4 protrudes from below the housing 1.

[0035] Furthermore, a grass-cutting rope guide 8 is provided at the outer periphery of the outer casing 1.

[0036] In addition, Figure 4 In the illustrated embodiment, the upper part 31T of the cable storage reel flange (refer to...) Figure 4 (a) or the upper part 31T of the cable reel flange and the lower part 31U of the cable reel flange (refer to) Figure 4 (b) The embodiment includes a flange protrusion 32 that protrudes from the upper surface or from both the upper and lower surfaces and has a concave-convex shape 3-1 on its outer peripheral side. This embodiment is a structure in which the flange protrusion 32 and the rope reel 3 are housed within a cover 2 during mowing. The concave-convex shape 3-1 is a shape used to rotate the rope reel 3 by gripping it with a finger. On the outer side of the outer peripheral surface having the concave-convex shape 3-1, there is a region S (refer to) that does not obstruct the movement of the finger when rotating the rope reel 3 by gripping the concave-convex shape 3-1. Figure 3 (“Appendix S”).

[0037] Furthermore, the flange protrusion 32 is provided on the surface of the rope reel flange by any of the following methods: fixing, fastening, and securing, but preferably by fitting or using screws for fastening.

[0038] In addition, the flange protrusion 32 can also be integrally formed with the cable reel flange.

[0039] and, Figure 5 The figure shows another embodiment of the pressing body, in which the upper edge portion 41 of the pressing body 40 may have an upper end concave-convex shape 42 that protrudes upward from the upper edge portion surface 41A and is formed on the upper end circumference.

[0040] In addition, Figure 6 , Figure 7 In another embodiment of the press body shown, the upper ends 141, 241 of the press body 140, 240 are provided with a hardness, structure, or upper end concave-convex shape 142, 242 that does not hinder the operation of the press body 140, 240.

[0041] The upper end concave and convex shapes 142 and 242 protrude upward from the upper end surface 141A and 241A. Multiple upper end concave and convex shapes 142 and 242 are installed separately on the pressing body at equal intervals or randomly on the upper end circumference through bonding, welding, insert molding, fastening, etc., or are set as an integral form integrally molded with the pressing body (the same part).

[0042] With regard to the upper end concave and convex shapes 42, 142, 242 provided on the upper end of the pressing body 41, 141, 241, when the pressing body is struck on the ground in order to release the mowing rope during operation using the rotary cutter of the lawnmower of the present invention, the upper end concave and convex shapes have the function of scraping out the debris that has entered and accumulated from the gap G of the pressing body during the mowing operation and is discharged from the gap (equivalent to the concave part) formed by the upper end concave and convex shapes, so as to stabilize the operation of the pressing body.

[0043] In addition, this function also applies when changing the straw rope, thus stabilizing the action of the pressing body.

[0044] It should be noted that, due to this function, the interior of the rotary cutter for lawnmowers of the present invention is less prone to accumulating debris, thus enabling a stable pressing action.

[0045] Regarding the rotary cutter for the lawnmower described above, the outer casing 1 and the rope reel 3, and the rope reel 3 and the cover 2 are respectively connected by a convex-concave interlocking structure, forming the following structure: When the pressing body 4 is struck on the ground, the pressing body 4 is pressed inward, thereby disengaging the outer casing 1 from the rope reel 3, causing the rope reel 3 to rotate, releasing the mowing rope (not shown) wound on the rope reel 3, and forming the following structure: the rope reel 3, pressed inward, engages with the cover 2, temporarily stopping rotation, but returns to its original position by the elastic force of the assembled spring (not shown), and the outer casing 1 and the rope reel 3 engage again, fixing the rope reel 3. It should be noted that the connection to the drive shaft (not shown) of the prime mover, etc., is via a nut member fixed inside the cover 2.

[0046] In the above Figures 1 to 7 In the rotary cutter for lawnmowers shown, when replacing the mowing rope due to wear and tear, the cover 2 is removed, and the central portion of a new mowing rope of the desired length is inserted from above and attached to the mowing rope insertion groove of the empty mowing rope reel 3, which is engaged with the outer casing 1, and the mowing rope guide 8, which is arranged in a straight line with the mowing rope insertion groove. With both ends of the mowing rope protruding from the mowing rope guide 8 by an appropriate length, the part of the pressing body 4, which is separate from or rotatably attached to the mowing rope reel 3, is held by hand. The concave-convex shape 3-1 provided on the outer peripheral side of the flange protrusion 32 provided on the upper or lower part of the mowing rope reel flange of the mowing rope reel 3 is used as a grip, and the reel is rotated manually to wind the mowing rope 9 onto the mowing rope reel 3. The winding operation of the mowing rope can be performed easily and quickly. Furthermore, since the straw rope can be wound while the rope reel 3 is fixed to the outer casing 1, the connection and winding of the straw rope 9 relative to the rope reel 3 can be performed easily and quickly. Moreover, in the straw rope replacement operation, as mentioned above, only the cover 2 needs to be removed without disassembling other components, so there is almost no possibility of losing any components of the rotary cutter.

[0047] Various embodiments have been described above with reference to the accompanying drawings, but the present invention is certainly not limited to these examples. It will be understood by those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and such modifications or alterations are also within the technical scope of the present invention. Furthermore, the constituent elements of the above embodiments can be combined arbitrarily without departing from the spirit of the invention.

[0048] It should be noted that this application is based on Japanese patent application filed on December 3, 2021 (Japanese Patent Application No. 2021-196971), the contents of which are incorporated herein by reference.

[0049] Industrial applications

[0050] When changing the mowing rope, the rotary cutter for lawnmowers of the present invention has almost no possibility of losing related parts or other components of the rope storage reel. In addition, since the rope storage reel is designed to be easily rotated by hand when winding the mowing rope, the connection between the mowing rope and the rope storage reel can be performed easily and quickly. The winding operation of the mowing rope can be performed quickly and reliably. Moreover, the structure is easy to manufacture and process, and the manufacturing cost is low.

[0051] Therefore, the rotary cutter for lawn mowers of the present invention is highly practical for mowing lawns and weeds.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1: Outer shell;

[0054] 2: Cover;

[0055] 3: Rope reel;

[0056] 3-1: (The concave and convex shape of the flange protruding from the side of the body);

[0057] 4, 40, 140, 240: Pressing body;

[0058] 8: Straw rope guide;

[0059] 9: Make straw ropes;

[0060] 31U: Lower part of the flange of the rope storage reel;

[0061] 31T: Upper part of the flange of the rope storage reel;

[0062] 32: Flange protrusion;

[0063] 41, 141, 241: The upper end of the pressing body;

[0064] 41A, 141A, 241A: The upper end surface of the pressing body;

[0065] 42, 142, 242: The concave and convex shape of the upper end of the pressing body;

[0066] G: Gap between the pressing body;

[0067] RC: Rotary cutter;

[0068] S: When turning the rope reel 3 by hand, there is no obstruction in the area that would hinder the movement of the finger.

Claims

1. A rotary cutter for a lawnmower, characterized in that it is a rotary cutter for a lawnmower with replaceable trimming ropes, and is further characterized in that... It comprises: a cutting rope for cutting grass, etc., by rotation; a rope reel for holding the cutting rope and releasing it intermittently while rotating; a main body for housing the rope reel; a cover; and a pressing body protruding from the main body, capable of moving axially by pressing and causing the rope reel to rotate intermittently. The rotary cutter for lawnmowers includes a flange protrusion that projects from the surface of the rope reel flange and has an uneven shape on its outer peripheral side. The rotary cutter for lawnmowers is configured such that, during mowing, the flange protrusion and the rope reel are covered from above and to the side by the cover. The concave-convex shape is the shape used to rotate the rope reel by holding it with your fingers. The outer side of the outer peripheral surface having the said concave-convex shape has a region in which there is no obstruction to the movement of the finger when the finger holds the concave-convex shape to rotate the rope reel.

2. The rotary cutter for a lawnmower according to claim 1, characterized in that, The flange protrusion is provided on the rope storage reel flange of the rope storage reel by any of the following methods: fixing, fastening, and securing.

3. The rotary cutter for a lawnmower according to claim 1, characterized in that, The flange protrusion is integrally formed with the rope storage reel flange of the rope storage reel.

4. The rotary cutter for a lawnmower according to claim 1, characterized in that, The upper end of the pressing body has a concave-convex shape.

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