US20020189107A1 - Grass-cutting head with reloading of the line without removal of the spool - Google Patents
Grass-cutting head with reloading of the line without removal of the spool Download PDFInfo
- Publication number
- US20020189107A1 US20020189107A1 US10/153,498 US15349802A US2002189107A1 US 20020189107 A1 US20020189107 A1 US 20020189107A1 US 15349802 A US15349802 A US 15349802A US 2002189107 A1 US2002189107 A1 US 2002189107A1
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- US
- United States
- Prior art keywords
- spool
- housing
- teeth
- line
- grass
- 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.)
- Abandoned
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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
-
- 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
- A01D34/4161—Means for feeding cutter line
- A01D34/4163—Means for feeding cutter line by triggered line feedout, e.g. bump-feeding
Abstract
A grass-cutting head (1) including: a housing (3); and at least one spool (5) placed in the housing and on which a cutting line (F) can be wound. The spool is accessible from the outside to enable a supply of cutting line to be wound onto it without taking said spool out of the housing. A stop is provided to hold the spool in the housing while the supply of cutting line is being wound onto the spool.
Description
- The present invention relates to a grass-cutting head for brushcutters or similar appliances.
- More specifically, the invention relates to a grass-cutting head of the type that comprises a housing, at least one spool placed in the housing and on which one or more cutting lines can be wound, and a mechanism for feeding the cutting line from the spool to restore the length of the cutting line projecting from the housing following wear due to the use of the head, and in which the feed mechanism includes a spring-action member.
- Heads of the kind indicated above are widely used in this sphere. Examples of this kind of head are disclosed in U.S. Pat. No. 5,095,688, U.S. Pat. No. 4,823,465, U.S. Pat. No. 4,893,410, U.S. Pat. No. 4,882,843, U.S. Pat. No. 4,274,201, U.S. Pat. No. 4,584,771 and U.S. Pat. No. 4,524,515.
- All these heads possess systems for lengthening the line (i.e. a feed mechanism) with spring-action members which act on a moveable slider or directly on the spool.
- When the line wound on the spool is exhausted owing to having been repeatedly lengthened to restore the length of line projecting from the head, it becomes necessary to open the housing and remove the spool in order to wind a new supply of line onto it. This operation is very difficult because of the presence of the spring-action member which, as soon as the housing is opened, ejects the actuating slider used to lengthen the line, or ejects the winding spool. Afterward, closing the head is a complicated and trying operation. Even the winding of the line onto the spool is a trying and problematic operation, as the turns of cutting line tend to overlap during winding. This leads to jamming later, when the cutting line is being fed out during use.
- It is an object of the present invention to provide a grass-cutting head that does not exhibit the drawbacks of conventional heads. More specifically, it is an object of the present invention to provide a grass-cutting head that will make the winding of a supply of line onto the spool an easy process.
- Basically, according to the invention the head is so configured that the spool is accessible from the outside to enable a supply of cutting line to be wound onto it without taking the spool out of the housing, means being provided to hold the spool in the head when the latter is opened to make the spool accessible for reloading of the line. During winding, the cutting line is advantageously passed through the feed bushings, in the opposite direction to the normal direction of feed during use.
- Particular advantages are achieved when the grass-cutting head possesses a cutting line feed mechanism of the type comprising a spring-action member. In this version, retention members prevent the spring-action member and/or the spool which the latter acts upon and/or other parts of the feed mechanism from escaping from the housing in the head when the head is opened to insert the ends of the supply of line into the spool.
- It thus becomes possible to load the cutting line into the spool while keeping the latter in its seat inside the head, avoiding the need to remove and refit the spool and/or parts of the feed mechanism thereof. Besides the advantage of an easier and quicker reloading operation, the line is wound more evenly onto the spool, without overlapping of the turns, as the line is correctly guided by the feed bushings of the head during winding of the line.
- In an especially advantageous embodiment, the retention members comprise anti-rotation means that allow manual rotation of the spool in the line winding direction so that the supply of cutting line is wound onto it, and that prevent or otherwise obstruct spontaneous rotation of the spool in the line unwinding direction. These anti-rotation means facilitate the winding of the supply of line onto the spool.
- In one possible embodiment, the grass-cutting head comprises a feed mechanism that has stop teeth integral with the spool and arresting stops engaging with said teeth to define angularly offset positions of said spool. An actuating slider is provided to cause an angular step by step rotation of the spool inside the housing in the cutting line unwinding direction when the head is spinning. The action of the actuating slider is opposed by the spring-action member, which forms a slider return means.
- The feed mechanism may also be of the automatic type.
- The slider can act on an axially moveable spool that carries two series of stop teeth which engage with corresponding stops or groups of stops integral with the housing. Alternatively, in a different embodiment, the stop teeth may again be integral with the spool, which however is situated in a fixed axial position, while the stop teeth engage with a moveable slider comprising the stops that engage with the teeth on the spool.
- In this version the housing may comprise a first portion through which there extends an axial hub that transmits the rotary drive to the grass-cutting head. Inside this housing portion is the spool from which the line is fed through bushings in the circumferential wall of the housing portion. A support is also provided for the spool mounted on the axial hub and elastically pressed against the first housing portion. The support retains the spool inside the housing. Said support possesses axially elongate openings through which pass the moveable stops carried by the actuating slider. The moveable stops engage with the teeth on the spool. An annular cover is also provided in order to close the housing around the spool support.
- The spool support may comprise, in an especially advantageous embodiment, end teeth engaging with the corresponding end teeth on the housing portion, thus forming anti-rotation means which prevent or obstruct spontaneous rotation of the spool in the unwinding direction. The teeth may be shaped so as to allow rotation of the spool support in the winding direction and prevent rotation in the opposite direction. As an alternative to the two sets of end teeth, inserts made of friction material may be used to increase the coefficient of friction.
- In a different embodiment, the spool is axially moveable under the action of an actuating slider, against which the spring-action member of the line feed mechanism acts. When pushed by the spring-action member, which also acts on the spool, the latter is held against the retention members which in this case are integral with the housing. The anti-rotation means that prevent or otherwise obstruct rotation of the spool in the cutting line unwinding direction may be arranged between the spool and the retention members.
- These anti-rotation means may comprise a layer of friction material or teeth of various shapes.
- The retention members may take various forms, some of which will be described in greater detail with reference to the examples of embodiments illustrated in the appended drawings.
- Other advantageous embodiments and features of the grass-cutting head according to the invention are indicated in the appended dependent claims and will be described in greater detail with the aid of the drawings.
- A clearer understanding of the invention will be gained from the description and from the attached drawing, which shows a practical, non-restrictive example of an embodiment of the invention. In the drawing:
- FIG. 1 shows an axial section through a head in a first embodiment of the invention;
- FIG. 2 shows a sectioned perspective view of the head shown in FIG. 1;
- FIGS. 2A and 2B show two perspective views of a head similar to the head of FIGS.1 and 2, during the insertion of a supply of cutting line;
- FIG. 3 shows an axial section through a head in a second embodiment;
- FIG. 4 shows a cutaway perspective view, with parts removed, of the head shown in FIG. 3;
- FIG. 5 shows a third embodiment of the head according to the invention in axial section;
- FIG. 6 shows a cutaway perspective view, with parts removed, of the head shown in FIG. 5;
- FIG. 7 shows a fourth embodiment of the head according to the invention in axial section;
- FIG. 8 shows a cutaway perspective view, with parts removed, of the head shown in FIG. 7;
- FIG. 9 shows an axial section through a modified form of the head shown in FIG. 7;
- FIG. 10 shows a perspective view, with parts removed, of the head shown in FIG. 9;
- FIG. 11 shows another embodiment of the head according to the invention in an axial section;
- FIG. 12 shows a cutaway perspective view, with parts removed, of the head shown in FIG. 11;
- FIG. 13 shows an embodiment similar to that illustrated in FIG. 11;
- FIG. 14 shows a cutaway perspective view, with parts removed, of the head shown in FIG. 13;
- FIG. 15 shows another embodiment of the head according to the invention in an axial section;
- FIG. 16 shows a cutaway perspective view of the head shown in FIG. 15;
- FIG. 17 shows an axial view on a different plane of the head shown in FIG. 15;
- FIG. 18 shows a cutaway perspective view of the head shown in FIGS. 15 through 17, similar to FIG. 16, but in which the spool has been cut through to show the part of the extender mechanism;
- FIG. 19 shows another embodiment of the head according to the invention in an axial section;
- FIG. 20 shows a cutaway perspective view of the head shown in FIG. 19;
- FIG. 21 shows the head shown in FIG. 19 in section on an axial plane taken at a different angle;
- FIG. 22 shows a cutaway perspective view of the head shown in FIGS. 19 through 21 in a different angle to that of FIG. 20;
- FIG. 23 shows an axial section through another head according to the invention;
- FIGS. 24, 25,26 show cutaway perspective views, at various angles, of the head shown in FIG. 23;
- FIG. 27 shows an axial section through another embodiment of the head according to the invention;
- FIG. 28 shows a cutaway perspective view, with parts removed, of the head shown in FIG. 27;
- FIG. 29 shows an axial section through a modified embodiment of the head shown in FIG. 27;
- FIG. 30 shows an axial section through another embodiment according to the invention; and
- FIGS. 31, 32,33 show cutaway perspective views at various angles of the head shown in FIG. 30.
- A first embodiment of the head according to the invention is illustrated in FIGS. 1 and 2. The head has the
general reference 1 and comprises ahousing 3 containing aspool 5 on which is wound a cutting line F, depicted as a series of turns in the longitudinal section of FIG. 1. - The
housing 3 has a cylindricalcircumferential wall 3A withbushings 4 through which the cutting line F passes out. Extending axially through the inside of thehousing 3 is ahub 7 with a threadedportion 7A and a hexagonal-section portion 7B coupled in torsion inside the through seat formed in thehousing 3. Thehub 7 is locked to thehousing 3 by a journal or stop 9 that screws onto a second threaded portion 7C of thehub 7 and that has anelastic ring 11. - Fitted onto the
hub 7, and journal 9 is astop component 13 that forms a support for thespool 5, being provided with acollar 13A on which thespool 5 sits. Thesupport 13 is held against thehousing 3 by a spring-action member consisting of ahelical spring 17 housed in a cylindrical seat formed in thesupport 13. Inside this cylindrical seat is amoveable actuating slider 19 withprojections 19A that project throughlongitudinal slots 13X in the cylindrical wall of thesupport 13. - The
projections 19A form stops acting on two series ofteeth spool 5. - The
actuating slider 19 is pushed by the spring-action member 17 against aknob 21 mounted on and retained by the journal 9. - The operation of the line feed mechanism, including the actuating
slider 19, with itsprojections 19A, thespring action member 17 and theteeth spool 5 is similar to that described in U.S. Pat. No. 5,095,688, and will therefore be described only briefly here. Pressing on theknob 21 compresses the spring-action member 17 and therefore moves the actuatingslider 19 in such a way that theprojections 19A of the latter disengage fromteeth 5B and engageteeth 5A, which are offset angularly relative toteeth 5B. When this actuation is performed with thehead 1 turning, the centrifugal force acting on the cutting line F turns thespool 5 untilteeth 5A are stopped by theprojections 19A. Releasing theknob 21 causes theactuating slider 19 to be moved back to the initial position (illustrated in FIGS. 1 and 2) by the spring-action member 17, with consequent disengagement ofteeth 5A and engagement ofteeth 5B by theprojections 19A as a result of a further angular rotation of thespool 5 due to centrifugal force. - Each time the
knob 21 is pressed, therefore, thespool 5 turns through an angle equal to twice the offset between theteeth - Around the
collar 13A supporting thespool 5 is a basicallycylindrical closing wall 13B on which is mounted anannular cover 25. This cover has anedge 25A that surrounds the free edge of thecircumferential wall 3A of thehousing 3. Thecover 25 may be held in position by its interference with theclosing wall 13B and/or by interference between theedge 25A and thecircumferential wall 3A, or by means of spring-action projections (not shown in FIGS. 1 and 2). - During the operation of the head, which for this purpose is fitted to the rotating hub of a brushcutter via the threaded
portion 7A of thehub 7, and revolved with the lines F projecting from thebushings 4, the cutting lines F wear away and it therefore becomes necessary to restore the cutting lines projecting from thehead 1 to their correct length by depressing theknob 21 and thus operating the actuatingslider 19. After repeated line feed operations, when the line is exhausted, a new supply of cutting line F must be wound onto thespool 5. - To do this, it is sufficient to remove the
annular cover 25 to give access from below to a pair ofanchor holes 5D for the ends of the cutting line F. The anchor holes 5D are in line withslots 5C in thelower flange 5G of thespool 5. The initial end of the new supply of line can be passed through thebushings 4 and through theradial slots 5C to allow the operator to grasp it in the area made accessible by the removal of theannular cover 25, and then insert it in thecorresponding anchor hole 5D. - Having secured the ends of the line in the
holes 5D, the operator, by twisting theclosing wall 13B of thespool support 13, can rotate, in the winding direction, the assembly made up of thebutton 21, the actuatingslider 19, thesupport 13 and thespool 5 around thehub 7 axis. Rotation in the winding direction is permitted by the shaping of sawtoothsection end teeth 29 formed on that portion of thesupport 13 which is pushed against thehousing 3, the latter having complementary teeth, as can be seen in particular in the cutaway view, FIG. 2. - The reverse rotation between the
support 13 and the housing 3 (the direction in which the line in unwound) is not permitted, so that spontaneous rotation in the line unwinding direction is prevented, not only during rewinding of the supply of line but also when the head is in operation. Theteeth 29 and the complementary teeth on thehousing 3 thus form an anti-rotation means for rotating in a winding direction, but not in an unwinding direction. - The system of mutual locking between the
housing 3, thesupport 13 and theknob 21 may differ from this. For example, thecentral hub 7 may be omitted and the connection may be provided by a system of spring-action fingers. Similarly, the connection between the head and the brushcutter may be provided by a snap-engaging quick-coupling system or the like, of a type known per se, rather than by means of a threaded journal. Similarly, theknob 21 and the actuatingslider 19 may be constructed in one piece. The journal 9 may be screwed in by a socket wrench passing through a hole in theknob 21, or the latter may be coupled in torsion to the journal 9 to enable it to rotate. - FIGS. 2A and 2B show a perspective view of a modified
housing 3′ of ahead 1′ equivalent to the head shown in FIGS. 1 and 2 in the open condition and show the operation of inserting a new supply of cutting line F. Parts identical or equivalent to those of FIGS. 1 and 2 are indicated by the same reference numbers. Theannular cover 25 has been removed to allow access from the outside to the underside of thespool 5. This spool hasslots 5C′ which are closed off toward the edge of the respective flange of the spool, rather than open as in FIG. 1. Also, thelower flange 5G′ of thespool 5 is provided on its outermost surface witharcuate projections 5H to facilitate the winding of the new supply of cutting line F by hand. Theknob 21′ is made of a smaller diameter than theknob 21 of FIGS. 1 and 2, and aprotective membrane 22 is arranged between it and theannular closing wall 13B of thesupport 13. - Also shown in FIGS. 2A and 2B are spring-
action tabs 6 formed integrally with thehousing 3. These are for fastening the annular cover 25 (omitted in FIGS. 2A and 213) in place. - FIG. 2A shows the ends Fx of two lengths of cutting line F that have been passed from the outside of the
housing 3 in through thebushings 4. The ends Fx project out through theslots 5C′ and can therefore be grasped by the user, pulled further to draw more line F through thebushings 4 and then inserted—thereby forming a loop Fy (FIG. 213)—in the anchor holes SD. The line F can then be pulled radially from the outside to take up the loop Fy and then be wound up by turning thespool 5 with the aid of thearcuate projections 5H. - FIGS. 3 and 4 show a different embodiment of the head according to the invention. The head, indicated by the
general reference 101, comprises a housing made up of amain portion 103 and alower cover 106. Inside the housing is aspool 105 with twoannular flanges spool 105 includes a central through hole through which extends acylindrical skirt 103A integral with theportion 103 of the housing. A spring-action component 117 in the form of a helical spring extends between thecylindrical skirt 103A and the inner wall of the axial through hole of thespool 105. The spring-action member pushes thespool 105 against alower slider 119 projecting from thehousing cover 106. - On the outside of the
upper flange 105X of thespool 105 are a plurality ofteeth 124 while on the outside of thelower flange 105Y areteeth 126 offset angularly relative to theteeth 124. The shape and the position of theteeth 126 can be seen particularly in FIG. 4 where for greater clarity thecover 106 and its projectingknob 119 have been removed. - The
upper teeth 124 engage with stops defined byfingers 128 formed on the upper wall of theportion 103 of the housing containing thespool 105, while thelower teeth 126 engage with stops formed by similar fingers on thecover 106, though these latter fingers are not visible as they are offset at an angle of 90° to thefingers 128. - The circumferential wall10313 contains
bushings 104 for the passage of the cutting line wound onto thespool 105, this line being omitted from the figure for greater clarity. - To restore the lengths of cutting line projecting from the
bushings 104 to their correct length following wear due to operation of the head, pressure is applied to theactuating slider 119, while the head is turning, causing compression of the spring-action member 117 and therefore axial movement of thespool 105. This releases theteeth 126 from the lower stops and engages theteeth 124 with the upper stops 128. - The angular offset between the
teeth spool 105 is traveling upward, said spool executes a rotary movement and a consequent unwinding of the line. This is caused by the centrifugal force acting on the line itself which continues until theteeth 124 meet thefingers 128. On releasing theactuating slider 119 the spring-action member 117 returns thespool 105 to the fully down position resulting in a second rotation of one step in the line-unwinding direction. This extender mechanism is known per se. - Once the supply of cutting line wound on the
spool 105 is exhausted it must be replaced. In conventional heads this had to be done by removing thecover 106, theslider 119 and thespool 105, which resulted in the spring-action member 117 also escaping. In the head according to the invention, however, thespool 105 is held in place axially bytabs 141 fitted into corresponding slots in thecircumferential wall 103B of thehousing portion 103. Thetabs 141 form a stop for the lower surface of theflange 105X of thespool 105, preventing the latter escaping when thecover 106 is removed. Removing the cover. 106 andactuating slider 119 gives free access to the underside of thespool 105 to allow a new supply of line to be anchored in anchor holes similar to those marked 5D in FIGS. 1 and 2 and not shown, for simplicity of the drawing in FIGS. 3 and 4. - The
spool 105 and the spring-action member 117 remain in their positions inside thehousing portion 103. The line is wound in by, for example, pushing theteeth 126 and turning the spool in the winding direction, conveniently indicated by an arrow on the lower face of theflange 105Y of the spool. To prevent spontaneous unwinding of the spool, the spool is provided withteeth 143 on the lower surface of theupper flange 105X. Theteeth 143 engage withcorresponding teeth 145 on thetabs 141. Operating thespool 105 by hand to turn it in the winding direction exerts sufficient force to cause theteeth 143 to ride over theteeth 145 and thus slightly compress the spring-action member 117, thus causing thespool 105 to rotate in the winding direction. The resistance presented by theteeth action member 117 are sufficient to prevent spontaneous unwinding. - FIGS. 5 and 6 show an embodiment equivalent to that of FIGS. 3 and 4 and identical parts are indicated by the same reference numbers. Here, the
tabs 141 engage withteeth 143 on the lower face of thelower flange 105Y of thespool 105. - FIGS. 7 and 8 show a variant of the head seen in FIGS. 3 and 4. Identical or corresponding parts are indicated by the same reference number increased by 100. So, for example, the head as a whole has the
reference 201 and thehousing portion 203. In this version thespool 205 is held in position, to prevent it from escaping when thecover 206 is opened, by spring-action tabs 241 formed integrally with thewall 203B of thehousing portion 203. To simplify the drawing, FIG. 8 omits not only thecover 206 and theactuating slider 219 but also the spring-action 5member 217. - Shown in FIGS. 9 and 10 is a variant of the head seen in FIGS. 7 and 8, in which the spring-
action tabs 241, again formed integrally with thewall 203B of thehousing portion 203, engage with the lower flange 205Y of thespool 205, rather than with its upper flange. Parts identical or corresponding to those of FIGS. 7 and 8 are indicated by the same reference numbers. - In the embodiments shown in FIGS.3-10 the
slider respective spool - FIGS. 11 and 12 show a variant of the head depicted in FIGS. 9 and 10. Identical or corresponding parts are indicated by the same reference numbers increased—by 100 over the numbers given in the embodiment in FIGS. 9 and 10. In this version the lower flange305Y of the
spool 305 possessesteeth 343 that engage withpegs 341 inserted through the wall 303D of thehousing portion 303. Thepegs 341 have the same function as thetabs pegs 341 are such as to ensure, in conjunction with theteeth 343, the anti-rotation action of thespool 305 in order to prevent spontaneous unwinding. Thepegs 341 or thetabs - FIGS. 13 and 14 show a variant of the head seen in FIGS. 11 and 12, such that the
pegs 341 engage with theupper flange 305X of thespool 305, on the underside of which latter are theteeth 343. Identical numbers indicate parts identical or corresponding to those of FIGS. 11 and 12. - FIGS.15-18 show, in various cross sections and perspective views, another embodiment of the head according to the invention. The head, designated 401 as a whole, comprises a housing with a
main portion 403 that hasbushings 404 on itscircumferential wall 4038 for the cutting line to be passed from the inside to the outside of the housing. The line is wound onto aspool 405 havingflanges end 407A for connection to the brushcutter. 407B denotes a portion of thehub 407 of hexagonal section for transmitting the rotary drive to the head. For this purpose theportion 407B sits in a seat formed in theportion 403 of the housing. - The head is closed on the underside by a
cover 406 which is fixed to theportion 403 of the housing by spring-action tabs 406A engaging inwindows 403C in thecircumferential wall 403B of thehousing portion 403. Thecover 406 is released by pressing inward from the outside on the spring-action tabs 406A to disengage them from thewindows 403 C. - The
spool 405 is provided with a series ofupper teeth 424 and a series oflower teeth 426 which engage withrespective stops portion 403 and on thecover 406, respectively. Theteeth stops spool 405 through thebushings 404 to compensate for line wear. To this end thespool 405 is moved axially so that there is alternate engagement between theteeth 426 and thestops 430 on the one hand, and between theteeth 424 and thestops 428 on the other. - The axial movement of the
spool 405 is brought about by pressure on theactuating slider 419 which pushes thespool 405 up, overcoming the elastic force of the spring-action member 417 which is situated between acollar 403X (integral with theportion 403 of the housing) and an annular shoulder 405S on thespool 405. - To prevent the
spool 405 from escaping from the seat formed by thehousing portion 403 when thecover 406 is removed by detaching the spring-action tabs 406A from thewindows 403C, there is anaxial retention member 451 comprising alower plate 451 A and spring-action tabs 451E that engage inwindows 403Y formed in thecollar 403X integral with thehousing portion 403. - The
discoidal portion 451 A of theretention member 451 hasteeth 451 B engaging with corresponding teeth 405E on thespool 405. Theteeth 451B and 405E form anti-rotation means to prevent spontaneous rotation of thespool 405 in the unwinding direction while a new supply of line is being wound on. This operation takes place as follows. Theactuating slider 419 is removed together with thecover 406, exposing the lower surface of thespool 405, which is held in place, along with the spring-action member 417, by theretention members 451. The new supply of line is passed in from the outside through thebushings 404 and the operator can easily engage the initial end of a length of line in thecorresponding hole 405D formed on the spool. By hand, using theteeth 426 to assist, the user winds a supply of line onto thespool 405 by rotating it in the winding direction. The torque applied by the operator on the spool generates an axial force through theteeth action member 417, allowing the teeth 405E to ride over theteeth 451 B so that thespool 405 rotates in the winding direction. The force of thespring 417 and the shape of theteeth 451 B, 405E are sufficient to prevent spontaneous rotation in the opposite direction. - Once the new supply of line has been wound on, the housing can be reclosed by once again fitting on the
cover 406 with a snap-action, having first inserted theactuating slider 419 into its central seat in thecover 406. - FIGS.19-22 show a modified embodiment of the head seen in FIGS. 15-18. Identical numbers indicate parts identical or corresponding to those of the embodiment seen in FIGS. 15-18.
- The embodiment shown in FIGS.19-22 differs in the different method of anchorage of the
retention members 451, which in this case are fixed to theaxial hub 407 which extends down into the lower region of the head, where ascrew 408 fastens theretention members 451 consisting of adisk 451 A with theteeth 451 B. - FIGS.23-26 show a modified embodiment of the head seen in FIGS. 15-18. This embodiment differs from the previous embodiment by having a different design of the
retention members 451 of thespool 405. Identical or corresponding parts are indicated by the same reference numbers as were used in FIGS. 15-18. - In this embodiment the
retention members 451 are held in place by spring-action fingers again marked 451 E in end windows marked 403Z in the top surface of thehousing portion 403. In this version the seat for thehub 407 is formed in asleeve 451 C in theretention members 451, rather than directly on thehousing portion 403 as in FIGS. 15-18. The latter portion again has acollar 403X coaxial with thesleeve 451C of theretention members 451, forming a stop for the spring-action member 417 which is housed between this stop and an annular stop formed in the internal through hole of thespool 405. Theretention members 451 again comprise a discoidalterminal portion 451 A that forms end teeth 45 1B engaging with the teeth 405E of the spool. - The
retention members 451 may also be formed in one piece with thehousing portion 403 and may have spring-action tabs at the lower end for engagement on the spool. This solution is illustrated diagrammatically in FIGS. 27 and 28, where identical numbers denote parts identical or corresponding to those of FIGS. 23-26. Theretention members 451 again retain thespool 405 in its position against the action of the spring-action member 417. They consist in the present case of spring-action tabs extending axially through the inside of thehousing portion 403, and have end teeth engaging with the teeth 405E of the spool. - The spool can be removed from the housing by radially compressing the spring-action tabs forming the
retention members 451, whereas in the previous version release was by acting on thetabs 451 E. - FIG. 29 shows an embodiment with some slight modifications compared with that of FIGS. 27 and 28. In this version the mutually meshing end teeth on the
retention members 451 and on the spool 405E are replaced by aring 460 of friction material interposed between the tabs forming theretention members 451 and the lower surface of thespool 405. This solution, which involves using a friction material rather than a toothed coupling to prevent or hinder spontaneous rotation in the unwinding direction, can also be adopted in the embodiments described earlier. - FIGS.30-33 show yet another embodiment of the head according to the invention. The head, which bears the
general reference 501, comprises a housing formed largely by amain portion 503 with acircumferential wall 503B containingoutlet bushings 504 for the cutting line which is wound onto aspool 505 housed inside the housing. The spool hasflanges teeth flanges respective stops stops 530 are formed on the bottom of thehousing portion 503, while thestops 528 are formed on the inner wall of acover 506 which fits above thehousing portion 503 to close the housing. Thecover 506 is held in place by spring-action tabs 503C extending axially along thecircumferential wall 503B of thehousing portion 503. - Around the
circumferential wall 503B arewindows 503D into which spring-action tabs 561E belonging to retention members with thegeneral reference 561 engage. These retention members define an annular seat 561S that runs around anaxial sleeve 506M formed in one piece with thecover 506. Around thesleeve 506M is a spring-action member 517 formed by a helical spring which is contained between the seat 561S and the upper surface of theupper flange 505X of thespool 505. The spring-action member 517 thus pushes thespool 505 against anactuating slider 519 projecting down from thehousing portion 503. - The
cover 506 is traversed by ahub 507 with the threadedportion 507A and a hexagonal-section portion 507B which is coupled in torsion in a seat of similar cross section formed in thesleeve 506M of thecover 506. The threadedportion 507A of thehub 507 fits onto the brushcutter, and the hub itself transmits the rotation to thehead 501. - As in the previous versions, the cutting line is fed by pressing the
actuating slider 519 in so that it overcomes the force of the spring-action member 517 and displaces thespool 505 axially to bring theteeth stops teeth stops spool 505 to rotate in steps under the impulse of centrifugal force when thehead 501 is spinning, thus giving a gradual lengthening of the cutting line. When the latter is exhausted a new supply of cutting line can be inserted into thespool 505 without removing the spring-action member 517 and said spool, simply by removing thecover 506 by applying pressure to the two spring-action tabs 503C. This allows access from the outside to the upper part of thespool 505 so that the user can insert the initial end of a new supply of line from the outside through thebushings 504 and anchor this end of the line to the spool, for example by pushing it into theholes 505D as shown in FIG. 30. Winding is by rotating the spool in the winding direction. - Rotation is permitted because the
lower teeth 526 are sloping on one side as shown at 526X in FIG. 32. This allows theteeth 526 to ride over thestops 530 when a torque is applied to thespool 505 in the winding direction. Spontaneous rotation in the cutting line unwinding direction is prevented by the surfaces of theteeth 526 parallel to the axis of the head, which butts against thestops 530. - If it is wished to strip the head completely, all that is required is to push the spring-
action tabs 561E in out of thewindows 503D of thehousing portion 503. - It will be understood that the drawing shows only an example purely as a practical demonstration of the invention, which invention can be varied in its shapes and arrangements without however departing from the scope of the concept on which the invention is based.
Claims (20)
1. A grass-cutting head with a line, the head comprising:
a housing;
at least one spool placed in said housing and on which a line can be wound, said spool including an anchor for the line, said anchor being accessible from outside said housing to enable the line to be connected to said anchor of said spool without taking said spool out of said housing;
a feed mechanism for feeding the line from said spool;
a winding mechanism for rotating said spool to enable a supply of the line to be wound onto said spool;
a stop connected to said housing to hold said spool in said housing while the line is being connected to said spool.
2. A grass-cutting head in accordance with claim 1 , wherein:
said winding mechanism rotates said spool from outside said housing without taking said spool out of said housing;
said stop means holds said spool in said housing while said supply of line is being wound onto said spool.
3. A grass-cutting head in accordance with claim 1 , wherein:
said stop and said anchor are arranged spaced from each other in a radial direction of said spool.
4. A grass-cutting head in accordance with claim 1 , wherein:
said spool defines a center opening;
said stop and said housing connect to each other though said center opening of said spool;
said stop extends radially outward further than said center opening of said spool.
5. A grass-cutting head in accordance with claim 4 , wherein:
said anchor is arranged radially further outward than said stop.
6. A grass-cutting head in accordance with claim 1 , wherein:
said anchor defines a line receiving hole opening in an axial direction of said spool.
7. A grass-cutting head in accordance with claim 1 , wherein:
said feed mechanism includes a spring-action member;
said stop opposes action of said spring-action member when the head is opened to render said spool accessible from the outside.
8. A grass-cutting head in accordance with claim 1 , wherein:
said stop includes retention members that act against the force of said spring-action member, preventing said spring action member from escaping from the housing when the housing is open to enable said supply of cutting line to be wound onto the spool.
9. A grass-cutting head in accordance with claim 1 , wherein:
said feed mechanism comprises in combination an actuating slider, a first series of teeth integral with said spool and a second series of teeth integral with said spool, teeth of the first series engaging with a first stop or group of stops rotationally fixed to said housing and teeth of the second series engaging with a second stop or group of stops rotationally fixed to said housing, positions of arrest of said spool defined by the first series of teeth and by the first stop or group of stops being angularly offset relative to positions of arrest of said spool defined by the second series of teeth and by the second stop or group of stops;
and movement of said actuating slider causes an axial movement of the spool between two positions to bring the teeth of the first series or the teeth of the second series alternately into engagement with their respective stops, the spring-action member exerting a force on the spool.
10. A grass-cutting head in accordance with claim 9 , wherein:
said housing includes a housing portion through which extends an axial hub of a rotary drive, and said spool being placed around said housing portion;
axially elongate openings in said support, through which pass said moveable stops carried by said actuating slider and engage with the teeth on the spool; and
an annular cover closes said housing and extends around the support for said spool.
11. A grass-cutting head in accordance with claim 10 , wherein:
said support has end teeth engaging with corresponding end teeth on said housing portion.
12. A grass-cutting head in accordance with claim 11 , wherein:
said end teeth are shaped so as to allow rotation of the support and of the spool in a winding direction and prevent rotation in an opposite direction.
13. A grass-cutting head in accordance with claim 10 , wherein:
said support for said spool has a cylindrical wall around which the spool is placed and said support also includes a supporting collar supporting said spool.
14. A grass-cutting head in accordance with claim 13 , wherein:
said support has a cylindrical support in which said actuating slider moves, the actuating slider being elastically pressed by said spring-action member.
15. A grass-cutting head in accordance with claim 13 , wherein:
a generally cylindrical closing wall extends from said supporting collar, said annular cover is mounted on said cylindrical closing wall.
16. A grass-cutting head in accordance with claim 15 , wherein:
a circular skirt defines a circumferential wall of the housing, said annular cover has an edge that embraces said circular skirt.
17. A cutting head comprising:
a housing:
a spool rotatably mounted in said housing, cutting line being windable on said spool;
a feed mechanism for rotating said spool in an unwinding direction in said housing and feeding cutting line off of said spool;
a winding mechanism for rotating said spool in a winding direction while said spool is in said housing and winding cutting line onto said spool, said winding mechanism including teeth on said spool and teeth on said housing, said teeth having a shape to slide past each other when said spool is wound in said winding direction, said shape of said teeth blocking rotation of said spool with respect to said housing in said unwinding direction;
a stop connected to said housing and blocking separation of said spool from said housing during winding of cutting line by said winding mechanism, said stop including a support connected to said housing, said support rotatably holding said spool between said housing and said support.
18. A head in accordance with claim 17 , wherein:
said spool has projections to facilitate rotation of the spool by hand in the housing in order to cause the supply of line to be wound up.
19. A head in accordance with claim 17 , wherein:
said feed mechanism bypasses said winding mechanism to feed cutting line off said spool.
20. A head in accordance with claim 17 , wherein:
said stop and said winding mechanism share common structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/153,498 US20020189107A1 (en) | 1998-07-07 | 2002-05-22 | Grass-cutting head with reloading of the line without removal of the spool |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1998FI000163A IT1304867B1 (en) | 1998-07-07 | 1998-07-07 | GRASS CUTTER HEAD WITH THREAD REFILL WITHOUT DRAWING EXTRACTION |
ITFI98A000163 | 1998-07-07 | ||
US09/348,069 US6944954B1 (en) | 1998-07-07 | 1999-07-06 | Grass-cutting head with reloading of the line without removal of the spool |
US10/153,498 US20020189107A1 (en) | 1998-07-07 | 2002-05-22 | Grass-cutting head with reloading of the line without removal of the spool |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/348,069 Continuation US6944954B1 (en) | 1998-07-07 | 1999-07-06 | Grass-cutting head with reloading of the line without removal of the spool |
Publications (1)
Publication Number | Publication Date |
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US20020189107A1 true US20020189107A1 (en) | 2002-12-19 |
Family
ID=11352623
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/348,069 Expired - Lifetime US6944954B1 (en) | 1998-07-07 | 1999-07-06 | Grass-cutting head with reloading of the line without removal of the spool |
US10/153,498 Abandoned US20020189107A1 (en) | 1998-07-07 | 2002-05-22 | Grass-cutting head with reloading of the line without removal of the spool |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US09/348,069 Expired - Lifetime US6944954B1 (en) | 1998-07-07 | 1999-07-06 | Grass-cutting head with reloading of the line without removal of the spool |
Country Status (8)
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US (2) | US6944954B1 (en) |
EP (1) | EP0970596B1 (en) |
AT (1) | ATE257317T1 (en) |
CA (1) | CA2276976A1 (en) |
DE (1) | DE69914026T2 (en) |
ES (1) | ES2212510T3 (en) |
IT (1) | IT1304867B1 (en) |
TW (1) | TW473376B (en) |
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US20050252009A1 (en) * | 2004-05-11 | 2005-11-17 | Alliss George E | Vegetation trimmer apparatus |
US20080052917A1 (en) * | 2006-09-01 | 2008-03-06 | Proulx Manufacturing, Inc. | Trimmer Head For Use In Flexible Line Rotary Trimmers Having Improved Line Loading Mechanism |
US20080120847A1 (en) * | 2007-11-16 | 2008-05-29 | Torvian, Inc. | Bi-directional trimmer head spool with curved trimmer line guide |
CN100442967C (en) * | 2003-10-02 | 2008-12-17 | 圃络制造业股份有限公司 | Trimmer head for use in flexible line rotary trimmers |
US20090172955A1 (en) * | 2008-01-03 | 2009-07-09 | Morris John F | String trimmer head |
US20110214295A1 (en) * | 2010-03-04 | 2011-09-08 | Proulx Manufacturing, Inc. | Aerodynamic Trimmer Head For Use In Flexible Line Rotary Trimmers |
US8464431B2 (en) | 2009-01-22 | 2013-06-18 | Techtronic Outdoor Products Technology Limited | String head for a trimmer |
US20130326886A1 (en) * | 2012-06-12 | 2013-12-12 | Hantover, Inc. | Replaceable high grip connection for blade housing of rotary knife |
US20160128276A1 (en) * | 2014-11-11 | 2016-05-12 | Arnetoli Motor S.R.L. | Line-winding spool for grass-cutting heads |
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US20170238461A1 (en) * | 2016-02-22 | 2017-08-24 | Mtd Products Inc | Miulti-mode trimmer head |
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US20170349394A1 (en) * | 2006-11-16 | 2017-12-07 | George E. Alliss | String trimmer head with curved trimmer line guide |
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US20180098493A1 (en) * | 2016-10-13 | 2018-04-12 | Black & Decker Inc. | Powered spool line winding mechanism for string trimmer |
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US20190216013A1 (en) * | 2016-01-22 | 2019-07-18 | Nanjing Chervon Industry Co., Ltd. | Grass trimmer |
US10537057B2 (en) | 2017-04-04 | 2020-01-21 | Black & Decker, Inc. | Spool assembly for a trimmer head |
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US11818979B2 (en) | 2016-01-22 | 2023-11-21 | Nanjing Chervon Industry Co., Ltd. | Grass trimmer |
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ITUB20160257A1 (en) * | 2016-01-21 | 2017-07-21 | Arnetoli Motor Srl | A MOWER TO HEAD WITH A BOBBIN FOR THE CUTTING THREAD, A BOBBIN FOR THAT HEAD, AND A METHOD OF RECHARGING A CUTTING WIRE IN A HEAD |
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USD831449S1 (en) | 2017-06-28 | 2018-10-23 | Tecomec S.R.L. | Head trimmer |
CN111432624A (en) * | 2017-11-30 | 2020-07-17 | 胡斯华纳有限公司 | Trimmer head with improved line release feature |
US11412656B2 (en) | 2017-11-30 | 2022-08-16 | Husqvarna Ab | Trimmer head with improved line release feature |
Also Published As
Publication number | Publication date |
---|---|
ATE257317T1 (en) | 2004-01-15 |
DE69914026D1 (en) | 2004-02-12 |
US6944954B1 (en) | 2005-09-20 |
ITFI980163A1 (en) | 2000-01-07 |
EP0970596B1 (en) | 2004-01-07 |
IT1304867B1 (en) | 2001-04-05 |
TW473376B (en) | 2002-01-21 |
DE69914026T2 (en) | 2004-10-14 |
CA2276976A1 (en) | 2000-01-07 |
EP0970596A3 (en) | 2000-06-21 |
EP0970596A2 (en) | 2000-01-12 |
ES2212510T3 (en) | 2004-07-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |