CN104663113B - A kind of rotary grass-mowing machine - Google Patents
A kind of rotary grass-mowing machine Download PDFInfo
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- CN104663113B CN104663113B CN201310617994.7A CN201310617994A CN104663113B CN 104663113 B CN104663113 B CN 104663113B CN 201310617994 A CN201310617994 A CN 201310617994A CN 104663113 B CN104663113 B CN 104663113B
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Abstract
The invention discloses a kind of rotary grass-mowing machine, including housing, motor, line box, wire spool, unwrapping wire shift fork it is provided with in line box, this grass-mowing machine also includes length detection element, electric magnet, control element, rope of beating the grass is wound on wire spool, a part is worn outside outlet box, and rope of simultaneously beating the grass passes part and has a nominal length；When grass-mowing machine starts rotary work, partly whether can exceed nominal length according to passing of rope of beating the grass, control whether to carry out unwrapping wire；Whole process by detection beat the grass rope pass part produce centrifugal force judge its length, realize unwrapping wire control by electronic control component, can reduce beat the grass rope waste for no reason, the operation of user can be greatly facilitated again.
Description
Technical field
The present invention relates to a kind of rotary grass-mowing machine, particularly relate to a kind of rotary grass-mowing machine that can automatically control rope length of beating the grass.
Background technology
Grass-mowing machine of the prior art, it mostly is rotary grass-mowing machine, being through motor specifically drives a line box to rotate, connect flexibility on line box to beat the grass rope, this is beaten the grass to restrict to follow the rotation of line box and grass the most different on lawn is carried out cutting and arranges, but, owing to work normality is ceaselessly grazing, the consumption restricted of beating the grass is the fastest, initially after rope of beating the grass consumes, it is typically all and manually in line box, extracts rope of more beating the grass, the most obviously waste time and energy, in Power Tools Industries, then need a kind of technology that can make the automatic unwrapping wire of grass-mowing machine badly.
In the utility model patent of Application No. 201220038260.4, disclosing a kind of novel rotary mower, this hay mover is capable of automatic unwrapping wire.Its principle is: wind rope of beating the grass on wire spool, the top of wire spool is provided with concentric inner ratch gear and outer ratchet ring, one unwrapping wire cage knob is pressed in the top of wire spool, unwrapping wire cage knob is provided with the first triangle hook and the second triangle hook, one end of unwrapping wire cage knob connects spring, under normal condition, the first triangle hook engages with outer ratchet ring, and the second triangle hook engages with inner ratch gear.After user presses on and off switch, wire spool is followed motor and is slowly run, and wire spool synchronous axial system followed by rope of now beating the grass, and therebetween without relative motion, the length that rope of therefore beating the grass exposes is certain；And when rotating speed is increasingly faster, the centrifugal force that unwrapping wire cage knob is subject to increases, it is made to start compression spring, at this moment the first triangle hook and the second triangle hook progressively disengage gear or gear ring, when the most all departing from, wire spool and line box no longer synchronous axial system, " skid " the most therebetween, and such wire spool will release one section of rope of beating the grass；In like manner, the rotary centrifugal force that there is also rope of beating the grass when grass-mowing machine returns to stopped status from the state of high speed rotating crosses over a marginal value so that produces " skidding " between wire spool and line box and releases one section of rope of beating the grass again.This technical scheme, by the change of rotary centrifugal force during each switching on and shutting down, produces speed discrepancy between wire spool and line box by machinery means, thus reaches the purpose of automatic unwrapping wire.
Use technique scheme, when start or shutdown, all can be automatically releasable rope of beating the grass.But so can not really solve the problem that " on-demand " discharges rope of beating the grass: even if the length of rope of sometimes beating the grass is enough, along with the open and close machine of grass-mowing machine, inevitable meeting the most again releases one section of rope of beating the grass more, causes unnecessary waste；And sometimes need to discharge some ropes of beating the grass more, can open and close machine is released every time length inadequate again, user can only multiple switching machine, make the overall length of release meet the requirements.Either from the angle saved the still convenient angle used, this technical scheme all also exists certain problem.
Summary of the invention
In order to overcome the defect of prior art, it is an object of the invention to provide a kind of rotary grass-mowing machine, including housing；Motor, is located in described housing；Line box, is fixed with locating dowel in it, the output shaft of described motor is in transmission connection with described line box by described locating dowel；It is provided with wire spool in described line box, it is sheathed on movably in described locating dowel, the top of described wire spool is provided with concentric inner ratch gear and outer ratchet ring, rope of beating the grass it is wound with on described wire spool, described beat the grass rope one end pass described line box, described in beat the grass rope pass part there is a nominal length；Unwrapping wire shift fork, a sliding tray is offered on it, described unwrapping wire shift fork is arranged in described locating dowel by described sliding tray and can slide along the bearing of trend of described sliding tray, the bottom surface of described unwrapping wire shift fork is affixed on the top of described wire spool, one end of described unwrapping wire shift fork bottom surface is provided with the fixture block of projection, and described fixture block can be meshed with described inner ratch gear or described outer ratchet ring respectively when sliding with described unwrapping wire shift fork；Described rotary grass-mowing machine also includes: length detection element, and whether the length passing part that being used for described in detecting beats the grass restricts is more than described nominal length, and exports corresponding signal；Electric magnet, can produce and described unwrapping wire shift fork can be driven to slide along the electromagnetic force that the bearing of trend of groove slidably reciprocates；Control element, for receiving the described signal of described length detection element output, and control the described electric magnet described electromagnetic force of generation according to described signal.
Preferably, described rotary grass-mowing machine is provided with the TRT of electric energy needed for producing described control element manipulation.
Further preferably, described TRT includes the permanent magnet being located on described housing, is located on described line box and can follow the coil of described line box rotation, described TRT connects a capacitor being used for storing the electric energy that described TRT produces, and described capacitor is to described control power elements.
Preferably, described line box offers wire hole, described in beat the grass rope one end pass from described wire hole.
Preferably, when the length passing part of described rope of beating the grass is more than described nominal length, described length detection element exports the first signal, and described control element does not carry out any action after receiving described first signal；When the length passing part of described rope of beating the grass is less than or equal to described nominal length, described length detection element output secondary signal, after described control element receives described secondary signal, control described electric magnet generation electromagnetic force and drive described unwrapping wire shift fork to slidably reciprocate once along described sliding tray.
Further preferably, described length detection element include the first contact being fixedly installed, can or the second wafer that separate in electrical contact with described first contact, when rope of beating the grass described in described line tape is dynamic rotates, if beating the grass, the length passing part of rope is more than described nominal length, the rotary centrifugal force passing part of described rope of beating the grass oppresses described the second wafer makes it in electrical contact with described first contact, and described state in electrical contact is as described first signal output；If the length passing part restricted of beating the grass described in keeps separating with described first contact less than or equal to described nominal length, described the second wafer, and described released state exports as described secondary signal.
It is further preferred that after described control element receives described secondary signal, described fixture block first departs from described outer ratchet ring, engages with described inner ratch gear；Depart from described inner ratch gear again, again engage with described outer ratchet ring.
The rotary grass-mowing machine of the present invention controls the motion of unwrapping wire shift fork by electric magnet, control, by length detection element, the length passing part restricted of beating the grass simultaneously, whole process is intelligent, it is possible to the waste of the rope that simultaneously solves to beat the grass with user in-convenience in use two large problems.
Accompanying drawing explanation
Accompanying drawing 1 is the phantom of the rotary grass-mowing machine of the present invention；
Accompanying drawing 2 (a) is the first top view of A-A section in accompanying drawing 1；
Accompanying drawing 2 (b) is the second top view of A-A section in accompanying drawing 1；
Accompanying drawing 3 is the partial enlarged drawing of part B in accompanying drawing 1；
Accompanying drawing 4 is that the rotary grass-mowing machine of the present invention is for controlling the circuit theory diagrams of unwrapping wire.
In accompanying drawing:
1-housing, 2-motor, 3-line box, 4-wire spool, 5-unwrapping wire shift fork, 6-beats the grass rope, and 7-length detection element, 8-electric magnet, 9-controls element, 10-TRT, 11-capacitor；
21-output shaft；
31-locating dowel, 32-wire hole；
41-inner ratch gear, the outer ratchet ring of 42-；
51-fixture block；
71-the first contact, 72-the second wafer, 73-pressure block；
101-permanent magnet, 102-coil.
Detailed description of the invention
Preferred embodiment being described in detail of grass-mowing machine rotary to the present invention below in conjunction with the accompanying drawings.
Accompanying drawing 1-4 depicts the structure of the rotary grass-mowing machine of the present invention, including housing 1, the motor 2 be located in housing 1, motor 2 has output shaft 21, and output shaft 21 is in transmission connection with a line box 3, being fixed with locating dowel 31 in line box 3, output shaft 21 can be attached by interference fit with locating dowel 31.Being provided with wire spool 4, unwrapping wire shift fork 5 in line box 3, wherein wire spool 4 is set in locating dowel 31 movably, and the top of wire spool 4 is provided with concentric inner ratch gear 41 and outer ratchet ring 42, and the profile of tooth of the two is preferably unified profile of tooth；Sliding tray is offered on unwrapping wire shift fork 5, so that locating dowel 31 can be made to pass through, and can freely produce therebetween relatively to slide and be advisable, unwrapping wire shift fork 5 passes locating dowel 31 and is placed in the top of wire spool 4, it is provided with the fixture block 51 of projection in one end of the bottom surface of unwrapping wire shift fork 5 simultaneously, this fixture block 51 can engage with inner ratch gear 41, outer ratchet ring 51 respectively, when the bearing of trend that unwrapping wire shift fork 5 slides along groove slides, its fixture block 51 can slide between inner ratch gear 41 and outer ratchet ring 51, and engages with them respectively.When wire spool 4 under normal circumstances, it is possible to follow dependence unwrapping wire shift fork 5 be connected as a single entity with line box 3, synchronous axial system；And when unwrapping wire shift fork 5 slides, wire spool 4 no longer with line box 3 synchronous axial system, a rotation phase can be produced therebetween poor.
Being wound with rope 6 of beating the grass in the circumferential side wall of wire spool 4, its one end passes line box 3, and it passes mode can be to offer a wire hole 32 on online box 3, and the one end of rope 6 of beating the grass passes at wire hole 32；When line box 3 rotates, wire spool 4 can be followed line box 3 and be rotated, and beat the grass rope 6 also can concomitant rotation, owing to not producing not relative slip between wire spool 4 with line box 3, therefore beat the grass and restrict 6 to wear the length of outlet box 3 the most constant；For rope 6 of beating the grass, its part wearing outlet box 3 has a nominal length, namely minimum is beaten the grass length, if less than this length, then not having good effect of beating the grass, needing to carry out payoff operation.
Being additionally provided with a length detection element 7 in online box 3, the meeting of this length detection element 7 passes, according to rope 6 of beating the grass, the centrifugal force size that part produces when rotated, exports different signals.In the present embodiment, length detection element 7 at least includes the first contact 71, the second wafer 72.First contact 71, the second wafer 72 can use the metal contact piece that electric conductivity is good, in wherein the first contact is fixedly installed online box 3, the second wafer 72 needs have certain elasticity, can be in electrical contact with the first contact 71 or separate, when not receiving any External force interference, the two is to separate；The second wafer 72 contacts with rope of beating the grass, and can be oppressed by the centrifugal force passing part generation of rope of beating the grass, herein for being easy to accurately control the stress of the second wafer 72, the second wafer 72 is additionally provided with pressure block 73, pressure block 73 is connected with the second wafer 72, and contact with rope 6 of beating the grass, specifically, through hole can be offered on pressure block 73, the rope 6 that makes to beat the grass can pass this through hole, have only to ensure when rope rotation of beating the grass is beaten the grass, the centrifugal force produced can drive pressure block 73, it is made gradually to oppress the second wafer 72, when centrifugal force big the most to a certain extent time, the second wafer 72 can contact with the first contact 71.When the first contact 71 contacts with the second wafer 72, length detection element 7 is in channel status, and now export is the first signal, otherwise when the two separates, length detection element 7 is in off state, and now export is secondary signal.
It is additionally provided with an electric magnet 8 in online box 3, pulling force along its length or thrust can be produced, in the present embodiment, electric magnet 8 is arranged on unwrapping wire shift fork 5 one end away from fixture block 51, its length direction is identical with the bearing of trend of unwrapping wire shift fork 5 sliding tray, and therefore this electric magnet 8 can be used for driving the slip of unwrapping wire shift fork 5.When electric magnet 8 drives unwrapping wire shift fork 5 to slidably reciprocate, also driving fixture block 51 is engaged between inner ratch gear 41 with outer ratchet ring 42 back and forth simultaneously.
The rotary grass-mowing machine of the present invention is additionally provided with control element 9, for connecting length detecting element 7 and electric magnet 8, the most preferably pcb board.When controlling element 9 and detecting that length detection element 7 exports the first signal, control element 9 and do not produce any new action；When controlling element 9 and length detection element output secondary signal being detected, control element 9 controls electric magnet 8 and is successively sequentially generated pulling force and thrust and puts on unwrapping wire shift fork 5, namely put on fixture block 51, concrete action is: first pull fixture block 51 to make it depart from outer ratchet ring 42, engage with inner ratch gear 41, then promote fixture block 51 to make it depart from inner ratch gear 41, engage with outer ratchet ring 42, so unwrapping wire shift fork has actually carried out a slip having a try, and forms a complete cycle.
Being accurate soft copy owing to pcb board etc. controls element, its rated voltage obviously much smaller than the running voltage of grass-mowing machine, the most in the present embodiment, is additionally provided with a miniature TRT 10, for producing the work energy controlled needed for element 9.As accompanying drawing 3 illustrates, this TRT 10 includes the permanent magnet 101 being fixed on housing 1, the coil 102 that can rotate with line box 3, when coil 102 rotates, owing to it cut the magnetic induction line of permanent magnet 101, faradic current will be produced in coil 102, this faradic current can be stored in a capacitor 11, and capacitor 11 is electrically connected with controlling element 9, for powering to control element 9.Control element, after having obtained electric energy supply, can receive the signal of length detection element 7 output and control electric magnet 8 action.
The rotary grass-mowing machine of the present invention is when stopped status; length detection element 7 is not owing to receiving the impact of extraneous centrifugal force; pressure block 73 does not oppress the second wafer 72; fixture block 51 engages with outer ratchet ring 42; assuming that now beat the grass, the partial-length that passes of rope 6 is more than nominal length, as shown in accompanying drawing 2 (a).When user starts to start grass-mowing machine, the output shaft 21 of motor 2 starts to rotate, and is rotated by locating dowel 31 band moving-wire box 3, and wire spool 4 due to the connection of unwrapping wire shift fork 5 synchronous axial system therewith, and then driving rope 6 also concomitant rotation of beating the grass, above-mentioned each parts are the most all geo-stationary；Simultaneously, owing to the partial-length that passes of rope 6 of beating the grass is more than nominal length, the centrifugal force produced when it rotates makes pressure block 73 be pressed onto by the second wafer 72 on first contact 71, now length detection element 7 exports the first signal, control element 9 and do not produce new action, so unwrapping wire shift fork 5, wire spool 4, line box 3 is connected rotation, owing to there is no relative motion between them, rope 6 of therefore beating the grass to pass partial-length constant.
When beat the grass rope 6 after a period of operation, abrasion can be produced, its length passing part is gradually reduced, and when being decreased to nominal length or less than nominal length, the state of grass-mowing machine starts to switch to the situation shown in accompanying drawing 2 (b).Owing to rotary centrifugal force reduces, pressure block 73 and the second wafer 72 is made to cannot keep under control the first contact 71, the second wafer 72 departs from the first contact 71, length detection element 7 exports secondary signal, now control element 9 and detect this change, control electric magnet 8 and produce electromagnetic force, pull successively, promote unwrapping wire shift fork 5: first pull fixture block 51, disengage it from outer ratchet ring 42, so wire spool 4 and line box 3 no longer synchronous axial system, fixture block 51 is drawn close with inner ratch gear 41 and is engaged subsequently, due to outer ratchet ring 42, between inner ratch gear 41, the number of teeth is identical, but there is the difference of phase angle.In the motor process of above-mentioned fixture block 51, fixture block 51 can force between outer ratchet ring 42, inner ratch gear 41 generation relative motion, and when fixture block 51 engages with inner ratch gear 41 after, and wire spool 4 and line box 3 rotate together with another；Then electric magnet promotes fixture block 51 again so that it is departing from inner ratch gear 41, draw close with outer ratchet ring 42 and engage subsequently, in like manner, this process also can produce a relative motion, and rope 6 of beating the grass again can one section of new rope of beating the grass of many release.Above procedure is determined by the number of teeth of outer ratchet ring 42, inner ratch gear 41 as a cycle, the length of the rope 6 of beating the grass of this cycle releasing.
After releasing new rope 6 of beating the grass, if the partial-length that passes of rope 6 of beating the grass is more than nominal length, the rotary centrifugal force that pressure block 73 is subject to increases, and again oppresses the first contact 71 together with the second wafer 72 and makes it contact, and length detection element 7 exports the first signal again；Control element 9 and detect the first signal, the most do not make new action, continue to keep fixture block 51 to be engaged on outer ratchet ring 42.If beating the grass, the partial-length that passes of rope 6 is still less than nominal length, length detection element exports or secondary signal, then control element 9 can control electric magnet and carry out the most above-mentioned unwrapping wire cycle again, until the length partly that passes of rope 6 of beating the grass is more than nominal length.
Compared to prior art, the rotary grass-mowing machine of the present invention can carry out unwrapping wire automatically according to the rope length of beating the grass passed, and had both decreased the consumption for no reason of rope of beating the grass, and had made again whole operating process intelligent, alleviate the burden of user.
Above-described embodiment is only for technology design and the feature of the explanation present invention; its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this; can not limit the scope of the invention with this; all equivalence changes made according to spirit of the invention or modification, all should contain within protection scope of the present invention.
Claims (8)
1. a rotary grass-mowing machine, including
Housing (1)；
Motor (2), is located in described housing (1)；
Line box (3), is fixed with locating dowel (31) in it, the output shaft (21) of described motor (2) is in transmission connection with described line box (3) by described locating dowel (31)；
It is provided with in described line box (3)
Wire spool (4), it is sheathed on movably in described locating dowel (31), the top of described wire spool (4) is provided with concentric inner ratch gear (41) and outer ratchet ring (42), rope (6) of beating the grass it is wound with on described wire spool (4), described one end beating the grass rope (6) passes described line box (3), described in beat the grass rope (6) pass part there is a nominal length；
Unwrapping wire shift fork (5), a sliding tray is offered on it, described unwrapping wire shift fork (5) is arranged in described locating dowel (31) by described sliding tray and above and can slide along the bearing of trend of described sliding tray, the bottom surface of described unwrapping wire shift fork (5) is affixed on the top of described wire spool (4), one end of described unwrapping wire shift fork (5) bottom surface is provided with the fixture block (51) of projection, and described fixture block (51) can be meshed with described inner ratch gear (41) or described outer ratchet ring (42) respectively when sliding with described unwrapping wire shift fork (5)；
It is characterized in that, described rotary grass-mowing machine also includes:
Length detection element (7), whether the length passing part of the rope (6) that is used for described in detecting beating the grass is more than described nominal length, and exports corresponding signal；
Electric magnet (8), can produce and described unwrapping wire shift fork (5) can be driven to slide along the electromagnetic force that the bearing of trend of groove slidably reciprocates；
Control element (9), be used for receiving the described signal that described length detection element (7) exports, and produce described electromagnetic force according to the described signal described electric magnet of control (8).
Rotary grass-mowing machine the most according to claim 1, it is characterised in that: described rotary grass-mowing machine is provided with the TRT (10) for producing the required electric energy of described control element (9) work.
Rotary grass-mowing machine the most according to claim 2, it is characterized in that: described TRT (10) includes the permanent magnet (101) being located on described housing (1), is located on described line box (3) and can follow the coil (102) that described line box (3) rotates, described TRT (10) connects one and is used for storing the capacitor (11) of the electric energy that described TRT (10) produces, and described capacitor (11) is powered to described control element (9).
Rotary grass-mowing machine the most according to claim 1, it is characterised in that: offer wire hole (32) on described line box (3), described in beat the grass one end of rope (6) pass from described wire hole (32).
Rotary grass-mowing machine the most according to claim 1, it is characterized in that: when the length passing part of described rope (6) of beating the grass is more than described nominal length, described fixture block (51) is meshed with described outer ratchet ring (42), described length detection element (7) exports the first signal, and described control element (9) does not carry out any action after receiving described first signal；When the length passing part of described rope (6) of beating the grass is less than or equal to described nominal length, described length detection element (7) output secondary signal, after described control element (9) receives described secondary signal, control described electric magnet (8) generation electromagnetic force and drive described unwrapping wire shift fork (5) to slidably reciprocate once along described sliding tray.
Rotary grass-mowing machine the most according to claim 5, it is characterized in that: described length detection element (7) includes the first contact (71) being fixedly installed, can or the second wafer (72) that separate in electrical contact with described first contact (71), when rope (6) of beating the grass described in described line box (3) drives rotates, if beating the grass, the length passing part of rope (6) is more than described nominal length, the rotary centrifugal force passing part of described rope (6) of beating the grass oppresses described the second wafer (72) makes it in electrical contact with described first contact (71), described state in electrical contact is as described first signal output；If the length passing part of rope (6) of beating the grass described in is less than or equal to described nominal length, and described the second wafer (72) separates with the holding of described first contact (71), and described released state exports as described secondary signal.
Rotary grass-mowing machine the most according to claim 5, it is characterized in that: after described control element (9) receives described secondary signal, described fixture block (51) first departs from described outer ratchet ring (42), engages with described inner ratch gear (41)；Depart from described inner ratch gear (41) again, again engage with described outer ratchet ring (42).
Rotary grass-mowing machine the most according to claim 1, it is characterised in that: described inner ratch gear (41) is identical with the number of teeth of described outer ratchet ring (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310617994.7A CN104663113B (en) | 2013-11-28 | 2013-11-28 | A kind of rotary grass-mowing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310617994.7A CN104663113B (en) | 2013-11-28 | 2013-11-28 | A kind of rotary grass-mowing machine |
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| CN104663113A CN104663113A (en) | 2015-06-03 |
| CN104663113B true CN104663113B (en) | 2016-08-31 |
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| CN201310617994.7A Active CN104663113B (en) | 2013-11-28 | 2013-11-28 | A kind of rotary grass-mowing machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106416588B (en) * | 2015-08-05 | 2019-08-02 | 南京德朔实业有限公司 | Grass trimmer and control method thereof |
| CN107996122A (en) * | 2016-10-28 | 2018-05-08 | 苏州宝时得电动工具有限公司 | Grass-mowing machine and its line-putting method |
| CN108142074A (en) * | 2016-12-06 | 2018-06-12 | 苏州宝时得电动工具有限公司 | Grass-mowing machine |
| CN108617226A (en) * | 2017-03-23 | 2018-10-09 | 苏州宝时得电动工具有限公司 | Grass-mowing machine |
| US20190269070A1 (en) * | 2016-12-06 | 2019-09-05 | Positec Power Tools (Suzhou) Co., Ltd. | String Trimmer |
| CN107926265B (en) * | 2017-07-31 | 2021-06-22 | 上海交通大学 | Quick automatic mechanism of beating grass of being qualified for next round of competitions |
| CN109691289B (en) * | 2017-10-20 | 2020-10-23 | 南京德朔实业有限公司 | Grass trimmer and control method thereof |
| WO2019158008A1 (en) * | 2018-02-14 | 2019-08-22 | 南京德朔实业有限公司 | Grass trimmer, trimming head thereof and winding control method therefor |
| CN110213960B (en) * | 2018-04-02 | 2022-02-22 | 南京德朔实业有限公司 | Grass trimmer |
| WO2019192200A1 (en) * | 2018-04-02 | 2019-10-10 | 南京德朔实业有限公司 | Grass trimmer |
| CN108901312B (en) * | 2018-06-25 | 2021-12-31 | 董守江 | Cutterbar and have gardens weeding device of this cutterbar |
| CN111373946B (en) * | 2018-12-28 | 2022-01-04 | 南京德朔实业有限公司 | Grass trimmer |
| CN112088643B (en) * | 2019-06-17 | 2022-11-11 | 南京泉峰科技有限公司 | Grass mowing head |
| CN110235596B (en) * | 2019-07-17 | 2024-08-20 | 苏州宇园机械有限公司 | Take-up structure of pay-off box of grass trimmer |
| CN115486257A (en) * | 2022-09-27 | 2022-12-20 | 河森堡(深圳)科技有限公司 | Automatic paying-off and grass-mowing device |
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| GB2359002A (en) * | 2000-09-05 | 2001-08-15 | Black & Decker Inc | Cutting head for a string trimmer |
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| CN2459863Y (en) * | 2000-12-04 | 2001-11-21 | 苏州太湖企业有限公司 | Automatic paying-out mechanism of mower |
| CN201123243Y (en) * | 2007-11-21 | 2008-10-01 | 苏州宝时得电动工具有限公司 | Hand held cutting tool |
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| CN104663113A (en) | 2015-06-03 |
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