WO2007018440A1 - Flexible mowing unit - Google Patents

Flexible mowing unit Download PDF

Info

Publication number
WO2007018440A1
WO2007018440A1 PCT/PL2006/000055 PL2006000055W WO2007018440A1 WO 2007018440 A1 WO2007018440 A1 WO 2007018440A1 PL 2006000055 W PL2006000055 W PL 2006000055W WO 2007018440 A1 WO2007018440 A1 WO 2007018440A1
Authority
WO
WIPO (PCT)
Prior art keywords
bosses
cavities
mowing unit
fact
flexible
Prior art date
Application number
PCT/PL2006/000055
Other languages
French (fr)
Inventor
Wladyslaw Hura
Original Assignee
Wladyslaw Hura
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wladyslaw Hura filed Critical Wladyslaw Hura
Publication of WO2007018440A1 publication Critical patent/WO2007018440A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/015—Cutting mechanisms not covered by another group
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/416—Flexible line cutters
    • A01D34/4168—Constructional details of the flexible lines

Definitions

  • the object of the invention is a flexible mowing unit intended for use in mechanical scythes with electric or combustion drive for mowing grass, trimming lawn edges at flower beds, kerbs, around trees, bushes and places inaccessible for regular lawn mowers.
  • Plastic lines that have been used so far in mechanical scythes as a cutting unit are most usually made of polyamide plastics known under nylon and tarnamid trade names and due to the smooth surface of those lines they have little cutting properties. Those properties depend on a line diameter and the number of rotation of the scythe's head that the line is wound on. Cutting effect on grass or other plants being mowed results from the action of a resultant force originating from centrifugal force and a force tangent to a curve as taken by the line during the head rotation. As a result of that dynamic action, the section of a cut surface is irregular, close to tearing effect. Effectiveness of that process is the highest at the loose line end.
  • mowing efficiency can be increased only by using longer line and adopting higher rotational speed of the cutting head.
  • Using a longer line results in increase of its casing size, which also increases the scythe's weight, whilst increasing rotational speed of the head considerably increases mowing costs due to higher outlays needed to cover the increased expenditure of energy and the scythe's wear.
  • the aim of the invention is to increase mowing efficiency of mechanical scythes and broadening their cutting possibilities by developing a flexible mowing unit with a surface provided with cutting edges.
  • the flexible mowing unit according to the invention is characterised by the fact that on its surface of a fixed or variable section there are bosses and/or cavities provided with at least one cutting edge.
  • Bosses and/or cavities are in the form of regular circumferential protrusions and/or hollows. Bosses and/or cavities are in the form of irregular circumferential protrusions and/or hollows. Bosses and/or cavities are in the form of regular axial protrusions and/or hollows. Bosses and/or cavities are in the form of irregular axial protrusions and/or hollows.
  • Bosses and/or cavities placed along the longitudinal axis have a fixed pitch.
  • Bosses and/or cavities placed along the longitudinal axis have a variable pitch.
  • Bosses and/or cavities placed along the longitudinal axis are perpendicular to it. Bosses and/or cavities placed along the longitudinal axis are diagonal to it. Bosses and/or cavities placed along the longitudinal axis are in the form of a spiral and they have continuous and/or interrupted cutting edges. Bosses and/or cavities placed along the longitudinal axis are preferably in the form of a thread.
  • the advantage of the flexible mowing unit is that due to the use of cutting edges, mowing action proceeds in a similar way as in case of cutting with a saw, and therefore, mowing process is more effective, more precise, faster and more productive, even when mowing pliant plants. Mowing can be implemented using smaller diameter lines and at a lower rotational speed of the cutting head.
  • Fig. 1 shows a head of a mechanical scythe provided with a flexible mowing unit
  • Fig. 2 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities situated along the longitudinal axis and which are perpendicular to that axis and provided with at least one cutting edge in the form of regular circumferential protrusions and/or hollows
  • Fig. 1 shows a head of a mechanical scythe provided with a flexible mowing unit
  • Fig. 2 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities situated along the longitudinal axis and which are perpendicular to that axis and provided with at least one cutting edge in the form of regular circumferential protrusions and/or hollows
  • Fig. 1 shows a head of a mechanical scythe provided with a flexible mowing unit
  • Fig. 2 presents the flexible mowing unit of a surface with
  • Fig. 3 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities situated along the longitudinal axis and which are perpendicular to that axis and which are in the form of irregular circumferential protrusions and/or hollows;
  • Fig. 4 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities which are in the form of regular axial protrusions and/or hollows;
  • Fig. 5 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities which are in the form of irregular axial protrusions and/or hollows;
  • Fig. 4 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities which are in the form of regular axial protrusions and/or hollows;
  • Fig. 5 presents the flexible mowing unit of a surface with fixed or variable section which is provided with boss
  • Fig. 6 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis, which have a fixed pitch
  • Fig. 7 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis, which have a variable pitch
  • Fig. 8 shows the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis and diagonal to that axis;
  • Fig. 9 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis, which are in the form of a spiral with continuous cutting edges;
  • Fig. 10 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis, which are in the form of a spiral with interrupted cutting edges.
  • the flexible mowing unit of a fixed or variable section, wound on a reel 2 of a head 3 of a scythe 4 has a surface 1 provided with bosses 5 and/or cavities 6 which have at least one cutting edge 7.
  • Bosses 5 and/or cavities 6 are in the form of regular or irregular circumferential protrusions 8 and/or hollows 9.
  • Bosses 5 and/or cavities 6 are in the form of regular or irregular axial protrusions 8 and/or hollows 9.
  • Bosses 5 and/or cavities 6i situated along the longitudinal axis have a fixed pitch t or variable pitch U.
  • Bosses 5 and/or cavities 6J 1 situated along the longitudinal axis are perpendicular or diagonal to that axis.
  • Bosses 5 and/or cavities (B 1 situated along the longitudinal axis are in the form of a spiral, preferably a thread, with continuous or interrupted cutting edges.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)

Abstract

The object of the invention is the flexible mowing unit, intended for use in mechanical scythes with electric or combustion drive for mowing grass, trimming lawn edges at flower beds, kerbs, around trees, bushes and places inaccessible for regular lawn mowers. The flexible mowing unit characterised by the fact that the surface (1) of that unit of a fixed or variable cross section is provided with bosses (5) and/or cavities (6) of a fixed and/or variable height, which have at least one cutting edge.

Description

FLEXIBLE MOWING UNIT
The object of the invention is a flexible mowing unit intended for use in mechanical scythes with electric or combustion drive for mowing grass, trimming lawn edges at flower beds, kerbs, around trees, bushes and places inaccessible for regular lawn mowers.
To date, smooth-surface plastic lines of a circular section have been most commonly used in mechanical scythes as a cutting unit. Those lines are popularly used for mowing grass and other plants of low. resistance to cutting forces. While for cutting lignified shoots or plants of bigger stem section, shears made of metal or other material of considerable hardness are used.
Sometimes lines of polygonal section are also used, since due to their structure they have some cutting edges.
Plastic lines that have been used so far in mechanical scythes as a cutting unit are most usually made of polyamide plastics known under nylon and tarnamid trade names and due to the smooth surface of those lines they have little cutting properties. Those properties depend on a line diameter and the number of rotation of the scythe's head that the line is wound on. Cutting effect on grass or other plants being mowed results from the action of a resultant force originating from centrifugal force and a force tangent to a curve as taken by the line during the head rotation. As a result of that dynamic action, the section of a cut surface is irregular, close to tearing effect. Effectiveness of that process is the highest at the loose line end. In case of such a mowing process, mowing efficiency can be increased only by using longer line and adopting higher rotational speed of the cutting head. Using a longer line results in increase of its casing size, which also increases the scythe's weight, whilst increasing rotational speed of the head considerably increases mowing costs due to higher outlays needed to cover the increased expenditure of energy and the scythe's wear.
The aim of the invention is to increase mowing efficiency of mechanical scythes and broadening their cutting possibilities by developing a flexible mowing unit with a surface provided with cutting edges.
The flexible mowing unit according to the invention is characterised by the fact that on its surface of a fixed or variable section there are bosses and/or cavities provided with at least one cutting edge. Bosses and/or cavities are in the form of regular circumferential protrusions and/or hollows. Bosses and/or cavities are in the form of irregular circumferential protrusions and/or hollows. Bosses and/or cavities are in the form of regular axial protrusions and/or hollows. Bosses and/or cavities are in the form of irregular axial protrusions and/or hollows. Bosses and/or cavities placed along the longitudinal axis have a fixed pitch. Bosses and/or cavities placed along the longitudinal axis have a variable pitch. Bosses and/or cavities placed along the longitudinal axis are perpendicular to it. Bosses and/or cavities placed along the longitudinal axis are diagonal to it. Bosses and/or cavities placed along the longitudinal axis are in the form of a spiral and they have continuous and/or interrupted cutting edges. Bosses and/or cavities placed along the longitudinal axis are preferably in the form of a thread.
The advantage of the flexible mowing unit is that due to the use of cutting edges, mowing action proceeds in a similar way as in case of cutting with a saw, and therefore, mowing process is more effective, more precise, faster and more productive, even when mowing pliant plants. Mowing can be implemented using smaller diameter lines and at a lower rotational speed of the cutting head.
The object of the invention is presented in the example product in the drawing, where Fig. 1 shows a head of a mechanical scythe provided with a flexible mowing unit; Fig. 2 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities situated along the longitudinal axis and which are perpendicular to that axis and provided with at least one cutting edge in the form of regular circumferential protrusions and/or hollows; Fig. 3 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities situated along the longitudinal axis and which are perpendicular to that axis and which are in the form of irregular circumferential protrusions and/or hollows; Fig. 4 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities which are in the form of regular axial protrusions and/or hollows; Fig. 5 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities which are in the form of irregular axial protrusions and/or hollows; Fig. 6 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis, which have a fixed pitch; Fig. 7 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis, which have a variable pitch; Fig. 8 shows the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis and diagonal to that axis; Fig. 9 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis, which are in the form of a spiral with continuous cutting edges; Fig. 10 presents the flexible mowing unit of a surface with fixed or variable section which is provided with bosses and/or cavities, situated along the longitudinal axis, which are in the form of a spiral with interrupted cutting edges.
As it is presented in the drawing, the flexible mowing unit of a fixed or variable section, wound on a reel 2 of a head 3 of a scythe 4 has a surface 1 provided with bosses 5 and/or cavities 6 which have at least one cutting edge 7. Bosses 5 and/or cavities 6 are in the form of regular or irregular circumferential protrusions 8 and/or hollows 9. Bosses 5 and/or cavities 6 are in the form of regular or irregular axial protrusions 8 and/or hollows 9. Bosses 5 and/or cavities 6i situated along the longitudinal axis, have a fixed pitch t or variable pitch U. Bosses 5 and/or cavities 6J1 situated along the longitudinal axis, are perpendicular or diagonal to that axis. Bosses 5 and/or cavities (B1 situated along the longitudinal axis, are in the form of a spiral, preferably a thread, with continuous or interrupted cutting edges.

Claims

Patent Claims
1. A flexible mowing unit, characterised by the fact that the surface (1) of that unit of a fixed or variable cross section is provided with bosses (5) and/or cavities (6) of a fixed and/or variable height, which have at least one cutting edge.
2. A flexible mowing unit according to the Claim 1 , characterised by the fact that bosses (5) and/or cavities (6) are in the form of regular circumferential protrusions (8) and/or hollows (9).
3. A flexible mowing unit according to the Claim 1 , characterised by the fact that bosses (5) and/or cavities (6) are in the form of irregular circumferential protrusions (8) and/or hollows (9).
4. A flexible mowing unit according to the Claim 1 , characterised by the fact that bosses (5) and/or cavities (6) are in the form of regular axial protrusions (8) and/or hollows (9).
5. A flexible mowing unit according to the Claim 1 , characterised by the fact that bosses (5) and/or cavities (6) are in the form of irregular axial protrusions (8) and/or hollows (9).
6. A flexible mowing unit according to the Claim 1 or 4, characterised by the fact that bosses (5) and/or cavities (6), situated along the longitudinal axis, have a fixed pitch t.
7. A flexible mowing unit according to the Claim 1 or 5, characterised by the fact that bosses (5) and/or cavities (6), situated along the longitudinal axis, have a variable pitch I1.
8. A flexible mowing unit according to the Claim 1 or 2, characterised by the fact that bosses (5) and/or cavities (6), situated along the longitudinal axis, are perpendicular to that axis.
9. A flexible mowing unit according to the Claim 1 or 2, characterised by the fact that bosses (5) and/or cavities (6), situated along the longitudinal axis, are diagonal to that axis.
10. A flexible mowing unit according to the Claim 1 or 2 or 3, characterised by the fact that bosses (5) and/or cavities (6), situated along the longitudinal axis, are in the form of a spiral.
11. A flexible mowing unit according to the Claim 1 or 10, characterised by the fact that bosses (5) and/or cavities (6) have continuous cutting edges.
12. A flexible mowing unit according to the Claim 1 or 10, characterised by the fact that bosses (5) and/or cavities (6) have interrupted cutting edges.
13. A flexible mowing unit according to the Claim 1 or 2 or 3 or 10 or 11 or 12, characterised by the fact that bosses (5) and/or cavities (6), situated along the longitudinal axis, are in the form of a thread.
PCT/PL2006/000055 2005-08-11 2006-08-07 Flexible mowing unit WO2007018440A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PLP376593 2005-08-11
PL376593A PL376593A1 (en) 2005-08-11 2005-08-11 Flexible mowing element

Publications (1)

Publication Number Publication Date
WO2007018440A1 true WO2007018440A1 (en) 2007-02-15

Family

ID=37434337

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/PL2006/000055 WO2007018440A1 (en) 2005-08-11 2006-08-07 Flexible mowing unit

Country Status (2)

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PL (1) PL376593A1 (en)
WO (1) WO2007018440A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111656947A (en) * 2019-03-07 2020-09-15 南京德朔实业有限公司 Grass rope suitable for grass mower
US11330761B2 (en) * 2019-03-07 2022-05-17 Nanjing Chervon Industry Co., Ltd. Grass trimmer head and grass trimmer line suitable for a grass trimmer head

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054993A (en) * 1976-09-20 1977-10-25 Kamp Walter B Rotary cutting assembly having novel flail
US4186239A (en) * 1976-12-06 1980-01-29 Berkley & Company, Inc. Monofilament weed cutters
DE4005879C1 (en) * 1990-02-24 1991-03-21 Fa. Andreas Stihl, 7050 Waiblingen, De
EP0764398A1 (en) * 1995-09-20 1997-03-26 John R. Fogle Ribbed flexible cutting line
DE19632721A1 (en) * 1996-08-14 1998-02-19 Bosch Gmbh Robert Motorised trimmer for vegetation
DE19817883C1 (en) * 1998-04-08 1999-11-25 Monofil Technik Gmbh Plastic cutting wire, used in e.g. rotating brush cutters
FR2793648A1 (en) * 1999-05-20 2000-11-24 Speed France Quiet cutting wire for edge-trimmer has circular cross-section, annular structures of larger cross-section, and wire sections inserted between annular structures
EP1170406A1 (en) * 2000-07-04 2002-01-09 Klaus Bloch Process for the production of a monofilament and use thereof
WO2003020008A1 (en) * 2001-09-03 2003-03-13 Speed France Cutting wire for brush cutters and edge trimmers

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054993A (en) * 1976-09-20 1977-10-25 Kamp Walter B Rotary cutting assembly having novel flail
US4186239A (en) * 1976-12-06 1980-01-29 Berkley & Company, Inc. Monofilament weed cutters
DE4005879C1 (en) * 1990-02-24 1991-03-21 Fa. Andreas Stihl, 7050 Waiblingen, De
EP0764398A1 (en) * 1995-09-20 1997-03-26 John R. Fogle Ribbed flexible cutting line
DE19632721A1 (en) * 1996-08-14 1998-02-19 Bosch Gmbh Robert Motorised trimmer for vegetation
DE19817883C1 (en) * 1998-04-08 1999-11-25 Monofil Technik Gmbh Plastic cutting wire, used in e.g. rotating brush cutters
FR2793648A1 (en) * 1999-05-20 2000-11-24 Speed France Quiet cutting wire for edge-trimmer has circular cross-section, annular structures of larger cross-section, and wire sections inserted between annular structures
EP1170406A1 (en) * 2000-07-04 2002-01-09 Klaus Bloch Process for the production of a monofilament and use thereof
WO2003020008A1 (en) * 2001-09-03 2003-03-13 Speed France Cutting wire for brush cutters and edge trimmers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111656947A (en) * 2019-03-07 2020-09-15 南京德朔实业有限公司 Grass rope suitable for grass mower
US11330761B2 (en) * 2019-03-07 2022-05-17 Nanjing Chervon Industry Co., Ltd. Grass trimmer head and grass trimmer line suitable for a grass trimmer head

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