US20010023542A1 - String trimmer head - Google Patents
String trimmer head Download PDFInfo
- Publication number
- US20010023542A1 US20010023542A1 US09/740,023 US74002300A US2001023542A1 US 20010023542 A1 US20010023542 A1 US 20010023542A1 US 74002300 A US74002300 A US 74002300A US 2001023542 A1 US2001023542 A1 US 2001023542A1
- Authority
- US
- United States
- Prior art keywords
- head
- string
- slidable
- members
- clamping
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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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
- A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
- A01D34/416—Flexible line cutters
Definitions
- the present invention relates to an improved head for a string trimmer of the type which does not use a spooled or coiled supply of string.
- String trimmers are well known wherein a spool or coil of string is retained within the head of the trimmer. Such arrangement requires that the head be disassembled when a new supply of string becomes necessary. Additionally, when the string breaks, the head often must be disassembled in order to correct the problem and to adjust the string supply for resumption of operation. Such disassembly of the head is cumbersome and requires a certain amount of dexterity by the operator of the trimmer.
- the present invention represents an improvement over the arrangement disclosed in the aforesaid U.S. Pat. No. 5,758,424 by providing an arrangement wherein the string is more easily inserted or removed from the trimmer head and is more securely held in operation position.
- the arrangement also permits simplified removal of broken string, is more durable than known arrangements and minimizes wear on the string during operation.
- the improved arrangement employs a pair of clamping jaws for each strand of string to be held by the trimmer head.
- a slidable actuator is associated with each pair of jaws.
- Each actuator is easily accessible to the operator to permit the jaws pairs to be selectively opened and closed. This feature is particularly useful when worn or broken string is being replaced. Also, the actuators may be used when inserting a new length of string into the trimmer head.
- FIG. 1 is a perspective view of a trimmer head according to the invention
- FIG. 2 is a top plan view of a segment of the base portion of the trimmer head shown in FIG. 1;
- FIG. 3 is a partial cut-away view of the base portion of the trimmer head shown in FIG. 2.
- a trimmer head 10 comprises a base portion 12 and a cover portion 14 .
- the base and cover portions are held together by fasteners 16 , such as screws.
- the mating sidewalls of the base and cover portions are provided with aligned semi-circular notches so as to define a plurality of openings 18 providing access to the interior of the head.
- the openings are arranged at spaced locations about the periphery of the head. In the embodiment illustrated, openings 18 are disposed at 90° spacings about the head.
- Each opening receives an eyelet or grommet 20 which provides a smooth surface for string passing through the openings thereby reducing wear on the strings during operation.
- a collar or hub 22 is mounted on the upper surface of the cover portion 14 to surround and shield a drive arrangement (not shown) which extends to the trimmer head from a conventional trimmer motor and handle (also not shown for convenience of illustration).
- the base of hub 22 is provided with openings 24 to permit tools to be inserted within the hub.
- the upper surface of cover portion 14 also is provided with openings 26 which are radially aligned with openings 18 and through which respective actuator bars 28 project to permit their being accessible to the operator for the purpose now to be described.
- the upper surface of the base portion 12 is formed with a pair of projecting ribs 30 between which a slidable member 32 is disposed.
- the actuator bar 28 is fixed to the upper surface of member 32 .
- Ribs 30 guide member 32 as it slides on the upper surface of portion 12 towards and away from the rotational axis of the trimmer head 10 .
- a compression spring 34 is secured to the base portion 12 in contact with the inner end of member 32 so as to urge the outer end of member 32 into engagement with the mating sidewalls of the base portion 12 and cover portion 14 .
- a pair of mirror-imaged clamping jaws 36 and 38 are pivotally connected to the base portion 12 at respective axes 40 and 42 equally distanced from a line extending from the center of opening 18 to the center of the trimmer head. Jaws 36 and 38 are provided with complementary serrated edges 44 and 46 which face one another. These edges line along a line curvature which is eccentric to the respective axes 40 and 42 .
- the upper surfaces of the jaws 36 and 38 are provided with upwardly projecting ribs 48 and 50 having longitudinal axes each of which is disposed at an acute angle relative to a line from the center of opening 18 to the center of head 10 .
- a pair of rollers 52 and 54 are joined to the underside of the slidable member 32 and are positioned to engage projections 48 and 50 , respectively.
- the string can be removed from the head or repositioned relative thereto.
- a further feature of the present invention is the provision of an opening 60 in the bottom of the base portion 14 (see FIG. 2) located between the jaws and the inner end of slidable member 32 .
- an opening 60 in the bottom of the base portion 14 (see FIG. 2) located between the jaws and the inner end of slidable member 32 .
- the actuator bar is displaced by the operator while loading new string into when removing broken string segments. It will be understood, however, that the insertion of a string end through an eyelet or grommet 20 into engagement with jaws 36 and 38 causes the jaws to spread as the string is further advanced. When such advancement is stopped, the bias of spring 34 locks the string in position. If a broken string segment is gripped by the jaws when a new length of string is inserted into the head, the new string engages and advances the broken segment so as to release the jaws' clamping force thereby allowing the broken segment to be discharged from the head through opening 60 and the new string to be inserted into the head in replacement of the broken segment.
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Harvester Elements (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to an improved head for a string trimmer of the type which does not use a spooled or coiled supply of string.
- 2. Prior Art
- String trimmers are well known wherein a spool or coil of string is retained within the head of the trimmer. Such arrangement requires that the head be disassembled when a new supply of string becomes necessary. Additionally, when the string breaks, the head often must be disassembled in order to correct the problem and to adjust the string supply for resumption of operation. Such disassembly of the head is cumbersome and requires a certain amount of dexterity by the operator of the trimmer.
- To overcome deficiencies of the type just described, attempts have been made to supply string to a trimmer head from outside the head.
- An example of such an arrangement is disclosed in U.S. Pat. No. 5,758,424 wherein a pair of spring-loaded cams are disposed within the trimmer head at locations adjacent openings in the sidewall of the head through which string ends may be inserted. The sidewall includes an inwardly extending deflection at each opening towards which the respective cams are urged by their springs. As a result, a string passing through an opening is pressed against a sidewall deflection by the associated cam to retain the string.
- The present invention represents an improvement over the arrangement disclosed in the aforesaid U.S. Pat. No. 5,758,424 by providing an arrangement wherein the string is more easily inserted or removed from the trimmer head and is more securely held in operation position. The arrangement also permits simplified removal of broken string, is more durable than known arrangements and minimizes wear on the string during operation.
- More particularly, the improved arrangement employs a pair of clamping jaws for each strand of string to be held by the trimmer head. A slidable actuator is associated with each pair of jaws. Each actuator is easily accessible to the operator to permit the jaws pairs to be selectively opened and closed. This feature is particularly useful when worn or broken string is being replaced. Also, the actuators may be used when inserting a new length of string into the trimmer head.
- The invention will be described in greater detail with reference to the accompanying drawings wherein:
- FIG. 1 is a perspective view of a trimmer head according to the invention;
- FIG. 2 is a top plan view of a segment of the base portion of the trimmer head shown in FIG. 1; and
- FIG. 3 is a partial cut-away view of the base portion of the trimmer head shown in FIG. 2.
- Referring to FIG. 1, a
trimmer head 10 comprises abase portion 12 and acover portion 14. The base and cover portions are held together byfasteners 16, such as screws. The mating sidewalls of the base and cover portions are provided with aligned semi-circular notches so as to define a plurality ofopenings 18 providing access to the interior of the head. The openings are arranged at spaced locations about the periphery of the head. In the embodiment illustrated,openings 18 are disposed at 90° spacings about the head. Each opening receives an eyelet orgrommet 20 which provides a smooth surface for string passing through the openings thereby reducing wear on the strings during operation. - A collar or
hub 22 is mounted on the upper surface of thecover portion 14 to surround and shield a drive arrangement (not shown) which extends to the trimmer head from a conventional trimmer motor and handle (also not shown for convenience of illustration). The base ofhub 22 is provided withopenings 24 to permit tools to be inserted within the hub. The upper surface ofcover portion 14 also is provided withopenings 26 which are radially aligned withopenings 18 and through whichrespective actuator bars 28 project to permit their being accessible to the operator for the purpose now to be described. - Referring to FIGS. 2 and 3, the upper surface of the
base portion 12 is formed with a pair of projectingribs 30 between which aslidable member 32 is disposed. Theactuator bar 28 is fixed to the upper surface ofmember 32. Ribs 30guide member 32 as it slides on the upper surface ofportion 12 towards and away from the rotational axis of thetrimmer head 10. Acompression spring 34 is secured to thebase portion 12 in contact with the inner end ofmember 32 so as to urge the outer end ofmember 32 into engagement with the mating sidewalls of thebase portion 12 andcover portion 14. - A pair of mirror-imaged
clamping jaws base portion 12 atrespective axes Jaws serrated edges respective axes - The upper surfaces of the
jaws ribs head 10. A pair ofrollers slidable member 32 and are positioned to engageprojections - The operation of the trimmer head just detailed will now be described.
- When the
actuator bar 28 is displaced by the operator towards the center of the trimmer head to movemember 32 in the direction indicated by the arrowhead in FIG. 2,rollers ribs jaws pivotal axes serrated edges string 56 to be inserted within thetrimmer head 10 through an eyelet or grommet 20 from outside the head. When theactuator bar 28 is released, the force ofspring 34, which was compressed when the jaws were separated, causes theslidable member 32 to move in the opposite direction whereby the jaws rotate about their respective pivotal axes in the direction indicated by the arrowheads in FIG. 3 to clamp the string between theserrated edges - By the operational steps just described, the string can be removed from the head or repositioned relative thereto.
- When the trimmer head is rotated during a cutting operation, its centrifugal force urges the
serrated surfaces - A further feature of the present invention is the provision of an opening60 in the bottom of the base portion 14 (see FIG. 2) located between the jaws and the inner end of
slidable member 32. In the case where a string breaks, the release of the jaws on the remaining string segment, by movement ofbar 28 followed by inward displacement of the released segment caused when a new string is inserted through opening 18, results in such segment dropping from the trimmer head through opening 60. - In the description of operation just presented, the actuator bar is displaced by the operator while loading new string into when removing broken string segments. It will be understood, however, that the insertion of a string end through an eyelet or grommet20 into engagement with
jaws spring 34 locks the string in position. If a broken string segment is gripped by the jaws when a new length of string is inserted into the head, the new string engages and advances the broken segment so as to release the jaws' clamping force thereby allowing the broken segment to be discharged from the head through opening 60 and the new string to be inserted into the head in replacement of the broken segment.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/740,023 US6347455B2 (en) | 1999-12-20 | 2000-12-20 | String trimmer head |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17257899P | 1999-12-20 | 1999-12-20 | |
US09/740,023 US6347455B2 (en) | 1999-12-20 | 2000-12-20 | String trimmer head |
Publications (2)
Publication Number | Publication Date |
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US20010023542A1 true US20010023542A1 (en) | 2001-09-27 |
US6347455B2 US6347455B2 (en) | 2002-02-19 |
Family
ID=26868242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/740,023 Expired - Fee Related US6347455B2 (en) | 1999-12-20 | 2000-12-20 | String trimmer head |
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US (1) | US6347455B2 (en) |
Cited By (15)
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WO2003043404A1 (en) * | 2001-11-21 | 2003-05-30 | Proulx Manufacturing, Inc. | Fixed line head for flexible line rotary trimmers |
EP1416786A1 (en) * | 2001-08-17 | 2004-05-12 | Inc. Torvian | Vegetation trimmer apparatus |
EP1421840A1 (en) * | 2002-11-19 | 2004-05-26 | Manfred Sälinger GmbH Maschinen- und Apparatebau | Cutting head for motor scythes |
WO2008139246A1 (en) * | 2007-05-15 | 2008-11-20 | Speed France S.A.S. | A cutting head for a brush cutter, edge trimmer or similar |
EP2380424A1 (en) | 2010-04-21 | 2011-10-26 | Pellenc SA | Rotary cutting head using flexible filiform cutting elements and cutting devices provided with such a cutting head. |
EP2380426A1 (en) | 2010-04-21 | 2011-10-26 | Pellenc SA | Multifunctional rotary cutting head for cutting devices, and portable devices provided with such a cutting head. |
US20120066912A1 (en) * | 2010-09-16 | 2012-03-22 | Ferrell James C | Variable cutting height trimmer head |
US20120311866A1 (en) * | 2011-06-09 | 2012-12-13 | David Jones | Cable-ripping tool |
EP2591658A1 (en) * | 2011-11-09 | 2013-05-15 | Techtronic Outdoor Products Technology Limited | Variable cutting height trimmer head |
CN103098605A (en) * | 2011-11-11 | 2013-05-15 | 创科户外产品技术有限公司 | Variable cutting height trimmer head |
WO2014121131A2 (en) * | 2013-01-31 | 2014-08-07 | Shakespeare Company, Llc | Trimmer head with pivoting posts |
CN104137694A (en) * | 2013-03-06 | 2014-11-12 | 安德烈·斯蒂尔股份两合公司 | Thread cutting head for freestyle cutter |
EP3205200A1 (en) * | 2016-02-11 | 2017-08-16 | TTI (Macao Commercial Offshore) Limited | Trimmer head having line cartridge |
CN111096137A (en) * | 2018-10-26 | 2020-05-05 | 南京德朔实业有限公司 | Grass trimmer |
USD992379S1 (en) * | 2020-11-13 | 2023-07-18 | TwoY. co. ltd. | Trimmer head winding wheel |
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CA2395174C (en) * | 1999-12-20 | 2008-04-01 | Aep Industries, Inc. | Film cutter assembly |
US20030188437A1 (en) * | 2001-08-17 | 2003-10-09 | Alliss George E. | Vegetation trimmer apparatus |
US20040237315A1 (en) * | 2001-08-17 | 2004-12-02 | Alliss George E. | Vegetation trimmer apparatus |
BR0117118A (en) | 2001-09-03 | 2004-09-28 | Speed France | Cutting wire for lawn mowers and edge trimmers |
US6928741B2 (en) * | 2001-11-21 | 2005-08-16 | Proulx Manufacturing, Inc. | Fixed line head for flexible line rotary trimmers |
US6742263B2 (en) * | 2002-04-04 | 2004-06-01 | Bart T. Ellson | Filament trimmer with adjustable cutoff blade |
JP2005528900A (en) * | 2002-06-07 | 2005-09-29 | スピード、フランス | Novel cutting unit and novel cutting filament for plant cutting equipment |
FR2850235B1 (en) * | 2003-01-23 | 2005-10-21 | Speed France | CUTTING HEAD FOR BRUSHCUTTER, CUTTER OR SIMILAR |
FR2850239B1 (en) * | 2003-01-23 | 2005-10-21 | Speed France | CUTTING HEAD FOR BRUSHCUTTER, CUTTER OR SIMILAR |
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FR2850238B1 (en) * | 2003-01-23 | 2005-10-21 | Speed France | CUTTING HEAD FOR BRUSHCUTTER, CUTTER OR SIMILAR |
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US6944956B1 (en) | 2003-06-05 | 2005-09-20 | Robert Phillips | Fixed-line trimmer head |
US6983543B2 (en) * | 2003-12-12 | 2006-01-10 | Rovert L. Phillips | String trimmer head |
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US20060026846A1 (en) * | 2004-08-03 | 2006-02-09 | Alliss George E | Vegetation trimmer apparatus |
ITFI20050191A1 (en) * | 2005-09-13 | 2007-03-14 | Arnetoli Motor | MARBLE HEAD WITH PERIPHERAL ORGANS FOR HOOKING THE CUTTING WIRE |
US20070084061A1 (en) * | 2005-10-13 | 2007-04-19 | Bennett James A | Mechanism for attaching trimmer line strips to a head of a trimming apparatus |
JP4941956B2 (en) * | 2005-12-28 | 2012-05-30 | スターテング工業株式会社 | Rotary cutter for brush cutter |
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US8025249B2 (en) * | 2007-11-16 | 2011-09-27 | Alliss George E | Bi-directional trimmer head spool with curved trimmer line guide |
US10273112B2 (en) | 2006-11-16 | 2019-04-30 | Torvian Inc. | String trimmer head with curved trimmer line guide |
WO2008137061A1 (en) * | 2007-05-01 | 2008-11-13 | Torvian, Inc. | Top unloading fixed line trimmer head |
US20090172955A1 (en) * | 2008-01-03 | 2009-07-09 | Morris John F | String trimmer head |
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US8069574B2 (en) * | 2009-03-13 | 2011-12-06 | Starting Industrial Co., Ltd. | Rotary cutter for mower |
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US10136577B2 (en) | 2014-04-07 | 2018-11-27 | Shakespeare Company, Llc | Fixed-line trimmer head with improved line channel |
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US10070582B2 (en) | 2016-04-20 | 2018-09-11 | Tti (Macao Commercial Offshore) Limited | String trimmer head |
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EP1416786A1 (en) * | 2001-08-17 | 2004-05-12 | Inc. Torvian | Vegetation trimmer apparatus |
EP1416786A4 (en) * | 2001-08-17 | 2005-01-26 | Inc Torvian | Vegetation trimmer apparatus |
WO2003043404A1 (en) * | 2001-11-21 | 2003-05-30 | Proulx Manufacturing, Inc. | Fixed line head for flexible line rotary trimmers |
EP1421840A1 (en) * | 2002-11-19 | 2004-05-26 | Manfred Sälinger GmbH Maschinen- und Apparatebau | Cutting head for motor scythes |
WO2008139246A1 (en) * | 2007-05-15 | 2008-11-20 | Speed France S.A.S. | A cutting head for a brush cutter, edge trimmer or similar |
EP2380424A1 (en) | 2010-04-21 | 2011-10-26 | Pellenc SA | Rotary cutting head using flexible filiform cutting elements and cutting devices provided with such a cutting head. |
EP2380426A1 (en) | 2010-04-21 | 2011-10-26 | Pellenc SA | Multifunctional rotary cutting head for cutting devices, and portable devices provided with such a cutting head. |
WO2011131860A1 (en) | 2010-04-21 | 2011-10-27 | PELLENC (Société Anonyme) | Multifunctional rotary cutting head for cutting devices, and portable devices comprising such a cutting head |
WO2011131858A1 (en) | 2010-04-21 | 2011-10-27 | Pellenc (Societe Anonyme) | Rotary cutting head using wire-shaped flexible cutting elements, and cutting devices comprising such a cutting head |
US20120066912A1 (en) * | 2010-09-16 | 2012-03-22 | Ferrell James C | Variable cutting height trimmer head |
US20120311866A1 (en) * | 2011-06-09 | 2012-12-13 | David Jones | Cable-ripping tool |
US9099853B2 (en) * | 2011-06-09 | 2015-08-04 | Feinteck Llc | Cable-ripping tool |
EP2591658A1 (en) * | 2011-11-09 | 2013-05-15 | Techtronic Outdoor Products Technology Limited | Variable cutting height trimmer head |
CN103098605A (en) * | 2011-11-11 | 2013-05-15 | 创科户外产品技术有限公司 | Variable cutting height trimmer head |
WO2014121131A2 (en) * | 2013-01-31 | 2014-08-07 | Shakespeare Company, Llc | Trimmer head with pivoting posts |
WO2014121131A3 (en) * | 2013-01-31 | 2015-01-15 | Shakespeare Company, Llc | Trimmer head with pivoting posts |
CN104137694A (en) * | 2013-03-06 | 2014-11-12 | 安德烈·斯蒂尔股份两合公司 | Thread cutting head for freestyle cutter |
EP3205200A1 (en) * | 2016-02-11 | 2017-08-16 | TTI (Macao Commercial Offshore) Limited | Trimmer head having line cartridge |
CN111096137A (en) * | 2018-10-26 | 2020-05-05 | 南京德朔实业有限公司 | Grass trimmer |
USD992379S1 (en) * | 2020-11-13 | 2023-07-18 | TwoY. co. ltd. | Trimmer head winding wheel |
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