CN104661512A - Cutting head for a rotary-type mower, cutting element adapted to be fitted to such a cutting head and a rotary-type mower comprising such a cutting head - Google Patents

Cutting head for a rotary-type mower, cutting element adapted to be fitted to such a cutting head and a rotary-type mower comprising such a cutting head Download PDF

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Publication number
CN104661512A
CN104661512A CN201280074480.5A CN201280074480A CN104661512A CN 104661512 A CN104661512 A CN 104661512A CN 201280074480 A CN201280074480 A CN 201280074480A CN 104661512 A CN104661512 A CN 104661512A
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CN
China
Prior art keywords
cutting
pin
mounting base
cutting head
head
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.)
Pending
Application number
CN201280074480.5A
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Chinese (zh)
Inventor
洛塔尔·米茨拉夫
西格弗里德·科普
佩尔·克里斯滕松
尼尔斯·克拉森斯
约翰·霍伦多夫
马蒂亚斯·奈巴克卡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Husqvarna AB
Original Assignee
Husqvarna AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Husqvarna AB filed Critical Husqvarna AB
Priority to PCT/SE2012/050755 priority Critical patent/WO2014007688A1/en
Publication of CN104661512A publication Critical patent/CN104661512A/en
Pending legal-status Critical Current

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Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D34/00Mowers; Mowing apparatus of harvesters
    • A01D34/01Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/73Cutting apparatus
    • A01D34/733Cutting-blade mounting means
    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01DHARVESTING; MOWING
    • A01D34/00Mowers; Mowing apparatus of harvesters
    • A01D34/01Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/63Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
    • A01D34/73Cutting apparatus
    • A01D34/736Flail type

Abstract

The invention in particular is directed to a cutting head (1 ) for a rotary -type mower, the cutting head (1 ) comprising a rotatable mounting base (2) and at least one removable cutting element (8), wherein the at least one cutting element (8) is mounted rotatably and with a predefined radial clearance (C) to the mounting base (2). The application also concerns a rotary-type mower comprising such a cutting head.

Description

For rotary mower cutting head, be suitable for being mounted to the cutting element of this cutting head and comprising the rotary mower of this cutting head
Particularly, the present invention relates to a kind of cutting head for rotary mower and be suitable for the cutting element of the cutting head being mounted to rotary mower.
Traditional rotary mower (such as, brush saw or trimmer or hay mower) can be equipped with rotary cutting blade or the cutting head based on trimmer rope.A shortcoming of cutting blade is under any circumstance, and except shrub to be cut, grass or lawn, foreign matter (such as, stone, metal object, root, fragment of brick etc.) can cause the wearing and tearing of increase usually at corresponding cutting edge place.Trimmer rope is used to avoid these problems to a certain extent, this is because rope easily evades hard objects by flexural deformation.But compared with cutting blade, the durability of trimmer rope is relatively low.Another shortcoming of trimmer rope is that the trimmer rope by new is mounted to the head relative complex of cable type trimmer.
Therefore, the object of the invention is to overcome the problem relevant with cutting element to the rotary mower of above-mentioned prior art.Specifically, provide a kind of cutting head for rotary mower and cutting element, wherein cutting element has the durability of raising and can easily change.
This object and other objects are resolved by claim 1 and 15.Embodiments of the present invention are obtained by claim 2 to 14.
According to claim 1, provide a kind of cutting head for rotary mower.Term rotary mower should comprise the hay mower, rotary scythe grass cutter, trimmer, brush saw etc. of any type.Specifically, rotary mower should refer to trimmer and brush saw.
Rotary mower comprises at least one cutting head, and wherein cutting head comprises rotatable mounting base.The global shape of mounting base can be circular, oval or polygon, is rectangle or square especially.Further, mounting base comprises at least one removable cutting element.This at least one cutting element with predetermined radial clearance rotatably (that is, pivotly) be mounted to mounting base.Therefore, due to the rotary motion of mounting base, cutting element rotates along with mounting base, and because this cutting element of centrifugal force is by external pressure.
Cutting element can be coupled to corresponding pivot pin or bolt regularly.Also likely and preferably, cutting element loosely is coupled to pin or bolt.Term " loosely is coupled to " means that, during the rotation of mounting base, cutting element can rotate around pin especially.Such as, if the interior surface being arranged on the medium pore in cutting element is rolled in the outer perimeter of the respective pins through this hole, then may be this situation.
The predetermined radial clearance of term should refer to, cutting element can relative to the rotation of a mounting base mobile scheduled volume in radial directions.Motion in radial directions should independent of the rotary motion of cutting element around pin, but be carried out rotating and radial motion without the need to getting rid of especially simultaneously.
Why radial clearance allows cutting element to avoid or evade hard objects (such as, stone, fragment of brick, root etc.) is because when touching or touch corresponding object, cutting element can radially-inwardly move, and therefore avoids contacting with hard objects.Therefore, at least can prevent cutting element and object from colliding, thus reduce the wearing and tearing of each cutting side of cutting element.
But cutting element (especially the cutting side of cutting element) all will cause certain to wear and tear with any contact of hard objects.Therefore, such a wearing and tearing cannot thoroughly be avoided.But if cutting element or its cut surface concentrated wear (especially cutting sth. askew), then owing to acting on the centrifugal force on cutting element, the wear-side of cutting element will at least radially-inwardly move under unload operation.Therefore, the section that the wearing and tearing of cutting element are less will be located at outermost position and can be used for cutting action.
Specifically, the advantage that the combination of rotatable cutting element and radial clearance has is, on cutting edge (especially on cutting element) can obtain minimizing and wear and tear roughly uniformly.This makes be extended the service life of cutting element.
According to embodiment, radial clearance is sized to make to allow at least one cutting element substantially to retract to the inside of the outer perimeter of mounting base completely.This means, when cutting element encounters hard objects, cutting element can complete (preferably complete) bounce back in mounting base substantially, especially bounces back in the pocket be arranged in mounting base.In this configuration, each cutting edge of cutting element and cutting element is greatly protected, in order to avoid occur firmly to contact with various hard objects.By the rotation of cutting element and/or radial motion can and usually by acquisition or occupy advanced position.Mounting base can comprise pocket etc., and this pocket is unlimited at the outer perimeter place of mounting base, and is suitable for being located so that it can hold cutting element.
In a preferred modification, obtaining radial clearance is because cutting element comprises endoporus (especially relatively large endoporus), makes cutting element be or have annular shape.The diameter in hole can be and preferably pass the several times of the diameter of the pin in hole in the assembled state.In order to allow cutting element to bounce back to mounting base completely, the outward flange of mounting base is substantially corresponding with the maximum gauge of the annulus of cutting element with the distance between pin.In this configuration, being arranged to cutting element stretches out enough far away, can obtain good cutting effect from the outward flange of mounting base.
In different modification, obtain radial clearance be because cutting element be rotatably mounted to can at the pin of the movement in the radial direction of mounting base or bolt.Preferred acquisition motion is in the radial direction because pin or bolt are having in groove connector (link) directed, and this has groove connector in the radial direction of the rotation relative to mounting base and/or bending extension in the radial direction.This modification is also effective at the aspect in service life avoiding cutting element and foreign matter (such as, stone etc.) firmly to contact and to extend cutting element.
In another modification, obtaining radial clearance is because cutting element is fixed to mounting base by flexible member (especially rope and/or lead-in wire).In this configuration, if cutting element encounters hard objects, then it can radially-inwardly move, thus avoids occurring with hard objects firmly to contact.This modification is also effective for the service life of prolongation cutting element.
In another embodiment of cutting head, cutting element is round cutter sheet, preferably comprise in circumferential direction have continuous print cutting edge at least partially and/or comprise cutting edge that is that there is segmentation or that have tooth at least partially.In the present embodiment, cutting element can have annular shape.Cutting element can have the cutting edge of single circumference at its outer perimeter place.Cutting edge can be continuous print (that is, level and smooth), is the non-cutting edge having tooth especially.Cutting edge can also be the cutting edge having tooth.Dissimilar cutting edge can be arranged on circumferential cut edge place.This can make range of application wider.
In the modification of segmentation, cutting element can comprise the multiple cut length such as in spill or other shapes.This cut length (especially spill cut length) can be favourable, this is because cutting angle changes along with cutting edge in this case.This can make cutting efficiency improve.
Cutting element and the cutting edge that also can use other types and shape should be noted.Specifically, the star cutting element with the radial cutting edge that extends or blade can be used.
According to another embodiment, mounting base comprises the self-locking mechanism being suitable for engaging with cutting element in a self-locking manner.When wearing and tearing occur cutting element, it is favourable that self-locking mechanism (is especially changed) for removing for cutting element.By arranging self-locking mechanism, complicated retention mechanism and relevant complicated replacement operation can be avoided.
In one preferred embodiment, self-locking mechanism comprises pin or the bolt at the outer perimeter place being positioned at mounting base.This pin can be attached to mounting base regularly.But pin or bolt are also likely mounted to mounting base movably, and this pin or bolt are pushed and/or can be fixed in latched position.Another possibility is, arranges loosely and is attached to or can be attached to pin or the bolt of mounting base by loosely, be especially attached in the respective aperture of mounting base.Under any circumstance, pin be suitable for engaging (in particular through or stretch out) medium pore of cutting element.As has been described above, radial clearance is produced in difference diametrically between medium pore and pin.
Allow cutting element easy and quick-replaceable quick-change mechanism if self-locking mechanism is embodied as, then this is favourable.Below further some self-lockings and quick-change mechanism will be described in more detail.
In a structure of self-locking mechanism, sell and comprise lockplate at its loose end place.Lockplate can be such as oval, circular and rounded rectangle shape.Lockplate is suitable for being attached to pin, to limit the motion of cutting element on the axial direction of pin.This lockplate is conducive to realizing quick-change mechanism.The size of lockplate may be selected to be and makes, and cutting element can be passed tightly or be pushed on lockplate.In this case, for most of operating conditions of cutting head, can cutting element be avoided to a great extent to deviate from from pin.
In another embodiment, mounting base comprises the pocket of radially-inwardly locating relative to pin, and this pocket is unlimited in a radially outward direction and is suitable for holding cutting element at least partially.This pocket can prevent cut under material be wrapped on mounting base.Further, pocket can contribute to improving mounting base and/or the maintenance of cutting element or the mechanical strength of locking mechanism.In addition, pocket (especially its wall portion) can be used for realizing self-locking and quick-change mechanism.
Pocket contributes in an embodiment of self-locking mechanism at least in part wherein, be arranged to, the outward flange of the upper wall portion of pocket is located a little more than the upper surface of lockplate, and cutting element forms the interval with preset width and shape between its outer edges and lockplate, so that can arrive on pin through interval.When being designed to the outward flange of pocket the interval obtained as previously discussed, cutting element is made more to be difficult to deviate from or landing from pin (especially from the space after lockplate).Cutting element can be locked to pin in conjunction with above-described lockplate by interval effectively, and allows quick-replaceable cutting element.
It should be noted that the locking mechanism with corresponding interval is combined can works best with cutting element that is flexible or that can fully bend.Each cutting element can be such as made up of plastic material.With regard to the suitable material for cutting element, the material that usually can use any type should be noted, especially metal, plastics etc.If avoid the infringement that root, bark and fragment of brick and cement surface cause, then plastics cutting element will be preferred.Plastics cutting element (especially circular and/or circular ring type design) manufactures by injection moulding (especially two component overmoulding).Cutting element can comprise the material of different hardness.Such as, the exterior section (especially comprising the part of cutting edge) of cutting element can be have relatively low or medium-hard material, and the material that in middle section or further inside region uses can have higher hardness.In addition, cutting element can be made up of the material of different colours.At this, exterior section can have the color different from the interior section of cutting element.Exterior color can be used as wear indicator, and the border between different colours can indicating wear boundary.Just in case the predetermined portions of cutting element reaches wear mark, owing to lacking the material with exterior color, therefore it is easy to identified, thus needs to change cutting element.
In another embodiment, self-locking mechanism comprises the resilient tongue acted on pin place or pin, and this resilient tongue is for remaining on pin safely by cutting element.Resilient tongue and pin can be embodied as the unitary members being attached to mounting base.In this case, the free end of pin can be pushed on the wall of mounting base or recess or by towards this wall or recess and promote.It is also possible that tongue and pin are embodied as independent element, and tongue is pressed against the free end of pin.In person's two kinds of situations, corresponding elastic force is effective in the cutting element being secured across or being positioned to pin.
In the embodiment comprising resilient tongue and pin, also can be provided with the pocket as further described above.In this case, special advantage is, resilient tongue extends radially outwardly relative to the rotation of mounting base and flushes with the upper wall of pocket.In this case, preferably, pin is fixed to the outward flange of resilient tongue, and pin is promoted by towards the lower wall of pocket or diapire by the elastic force effect of resilient tongue.It should be noted that and promote on the lower wall that pin can be pushed to pocket or by towards lower wall, to stretch in the recess at lower wall place.Advantage tongue being arranged on the upper wall place of pocket is that user can be easily close to change cutting element.In order to change cutting element, can upwards pull tab portion, so that between tongue and pin or sell form suitable interval between lower wall.In this stage, the cutting element of removable wearing and tearing also arranges new cutting element, when discharging tongue, sell the medium pore through cutting element, and cutting element to be fixed to pin by elastic force effect.Can arrange at the upside place of tongue and be suitable for the handle etc. of easily mentioning tongue.
According to claim 13, be provided with cutting element.Cutting element comprises and has the cutting body that hole particularly has medium pore.Cutting element and hole are suitable for being mounted to the cutting head according to the described rotary mower of at least one item in claim 1 to 10.For advantage and the beneficial effect of cutting element, please refer to above description.Further, it should be noted that and can carry out design and implementation cutting element as the above proposed according to any cutting element combining the cutting head description proposed at present.Specifically, cutting element can be made up of plastic material, manufactures especially by injection moulding (especially two component overmoulding).Can as above described selection plastic material further, especially with regard to different colours.
In an embodiment of cutting element, substantially corresponding with the cutting element further described in conjunction with cutting head above, cutting body is disc-like shape, is annular especially.
In various embodiments, cutting element comprises multiple outer cut length, is spill cut length especially.This design of cutting element can be favourable, because the cutting angle of cutting element can change in the operating process producing effectively cutting result.
According to claim 15, rotary mower is provided with cutting head, and this cutting head is suitable for keeping the cutting element as further described in above any embodiment and structure removedly.
Advantage and beneficial effect come from above description and further describe.
The embodiment of selection of the present invention will be described by reference to the accompanying drawings now, in the accompanying drawings:
Fig. 1 illustrates the cutting head of the first structure;
Fig. 2 illustrates the cutting head be attached in Fig. 1 of trimmer;
Fig. 3 illustrates the cross section of the cutting head according to the second structure;
Fig. 4 illustrates the cross section of the cutting element of the second structure;
Fig. 5 illustrates the cross section of another cutting element of the second structure;
Fig. 6 illustrates the 3rd cutting head constructed;
Fig. 7 illustrates the cross section along the line VII-VII gained in Fig. 6;
Fig. 8 illustrates the 4th cutting head constructed;
Fig. 9 illustrates the cross section along the line IX-IX gained in Fig. 9;
Figure 10 illustrates the details of Fig. 8;
Figure 11 illustrates the 5th cutting head constructed;
It should be noted that the element of same or similar (especially function is identical) or parts with and represent with identical (that is, common) Reference numeral.
Fig. 1 illustrates the cutting head 1 of the first structure.Cutting head 1 comprises mounting base 2.Mounting base 2 has central opening 3 and with screw 4 circumferentially, these screws arrange and are used for cutting head 1 to be attached to rotary mower.Rotary mower can be the mower of power-operated mower and gasoline driven.
It should be noted that in the present case, cutting element 8 has continuous print circumference cutting edge.But, hereafter and the cutting element of any other type described above also can use in conjunction with the cutting head of the first structure.
It is oval outer shape that mounting base 2 has overall.Each summit place of oval mounting base 2 is provided with otch (cut-out) 6.In each otch, pin 7 is attached to the lower bottom part of otch 6.The circular ring type cutting element 8 with relatively large medium pore 9 screws on pin 7.The diameter of medium pore 9 is several times of the diameter of pin 7.The diameter of medium pore 9 and pin, the radial depth of otch and pin 7 are preferably chosen to cutting element 8 can be set back in otch 6 completely apart from the extrorse distance in periphery of mounting base 2.
Can find out from the left-hand cutout 6 Fig. 1, during the normal operating of cutting head 1, otch 6 cover by suitable covering 10.Covering 10 is coupled to mounting base 2 removedly, and the restriction of this covering extends radially inwardly and the pocket radially outward opened from pin 7 in the mounted state.Can find out, pocket is suitable for receiving each cutting element 8.Pocket is favourable, this is because the material under cutting can be prevented to be entangled on cutting head 1.
Generally, term is radially interpreted as described parts and is oriented at least in part in the radial direction.But the parts being described to radial directed also can be directed in the other direction, such as part radially directed and part circumferentially orientation, or part is oriented in towards on the direction of the circumference of mounting base (2).
As ise apparent from FIG. 1, cutting element 8 can be mounted to mounting base 1 by predetermined gap C rotatably.More precisely, clearance C is free space, allows cutting element 8 to carry out radial motion in this free space, due to this radial motion, cutting element 8 can at least in part (preferably fully) bounce back to the inside of the outer perimeter of mounting base 2.Therefore, if cutting element 8 encounters hard objects (such as, stone etc.), then cutting element 8 will be pushed to rotate and/or move radially in pocket, and therefore be protected to a great extent and avoid interacting further with object.Therefore, the wearing and tearing of cutting element 8 can greatly be reduced.Further, if cutting element 8 is encountered hard objects in a certain position and is worn, then due to the centrifugal force of effect during operation, wearing part will radially-inwardly move.Meanwhile, less part of wearing and tearing will be pushed radially outwardly.Therefore, the cutting effect of improvement can be obtained.Generally speaking, can realize the uniform wear of the whole circumferential cutting edge along cutting element 8, this can improve the life-span of cutting element 8 greatly.
Fig. 2 exemplarily illustrates the cutting head 1 in Fig. 1, and this cutting head is attached to the motor drive shaft (not shown) of trimmer.Cutting head 1 is installed and is positioned at the downside place of motor and gear housing 5.Such as brush saw or trimmer be installed or be coupled to assembly shown in Fig. 2 can.But shown cutting head 1 and mounting base 2 are not limited to brush saw and trimmer, and can be used for hay mower etc.
Fig. 3 illustrates the cutting head 1 of the second structure.The cutting element 8 of the second structure is coupled to mounting base 2 by two ropes or lead-in wire 12, and this mounting base is rotatably mounted to rotary mower.By utilizing corresponding rope 12 to install cutting element 8, radial clearance C can be obtained.Therefore, same advantage as described above in conjunction with figures 1 and 2 can be obtained.The cutting element 8 that it should be noted that in Fig. 3, Fig. 4 or Fig. 5 can design and Implement the cutting element 8 for being similar in Fig. 1 and Fig. 2.Specifically, cutting element 8 can be made up of plastic material, particularly with the form of circular slab or ring.Other materials is in addition to plastic elastomeric material and/or fibrous composite, and these other materials also can be used for the cutting element further described above and hereafter.
Fig. 4 illustrates the cross section of the cutting element 8 of the second structure.In this example, cutting element 8 comprises medium pore, and rope 12 is located (pitch) by this medium pore and is guided through this medium pore.The wedge 23 rope 12 being fixed to cutting element 8 can be provided with in medium pore.Medium pore (particularly the bending radius at each edge) and wedge 23 can design and be shaped so that the minimise wear of rope 12 in each edge of medium pore.
Replace wedge 23, medium pore can comprise the lining being mounted across rope 12.The top edge of lining and lower limb can be designed so that the minimise wear of rope 12 in each edge.Lining can be embodied as a kind of internal bearings of cutting element 8.
Fig. 5 illustrates the cross section of another cutting element of the second structure.Fig. 5 illustrates substitute mode rope 12 being attached to cutting element 8.Every bar rope 12 in Fig. 5 comprises lug boss 14 at its far-end.Cutting element 8 and then comprise again two minor axises (stub shaft) 15, lug boss 14 such as can connect (click and snap connection) mode with buckle be connected to this minor axis.In this case, can prevent the rotation due to cutting element 8 from causing the wearing and tearing of rope 12.Buckle between cutting element 8 with rope 12 to be connected etc. and to be configured with the quick-change mechanism being beneficial to and saving cutting element replacing construction.
Fig. 6 illustrates the 3rd cutting head constructed 1.The mounting base 2 of this structure has round-shaped, and comprises the relative position of two diameters for installing cutting element 8 respectively.It should be noted that and one or more position can be set.When only arranging one cutting element 8, need that there is counterpoise on the opposite sides.For simplicity, a cutting element 8 is only shown in Fig. 6.
In the present case, cutting element 8 has circular ring type shape, is wherein provided with the part or section with spill cutting edge 16.Spill cutting edge 16 is distributed on the circumference of cutting element 8 equably.When impingement angle changes, spill cutting edge 16 provides the advantage of cutting efficiency aspect.
Pin 7 is included for each in the position that two diameters installing cutting element 8 are respectively relative.As can be seen from Figure 7, pin 7 upwards extends from the base wall of mounting base 2.Pin 7 is suitable for engaging with the medium pore 9 of cutting element 8.Similar to the structure shown in Fig. 1 with Fig. 2, the diameter of the medium pore 9 in the 3rd structure is several times of the diameter of pin 7.Therefore, the radial clearance C of cutting element 8 is provided with.The diameter of cutting element 8, size and pin 7 may be selected to be apart from the outer peripheral distance of mounting base 2 and cutting element 8 can be bounced back in cutting head 1 completely.
In the region that cutting element 8 may bounce back, be provided with a kind of cladding element 17, this cladding element limits pocket 18 (see Fig. 7) towards the diapire of mounting base 2.Pocket 18 is designed to the pocket in Fig. 1 similar, particularly can be designed so that, when making or promote (urge) cutting element 8 radially-inwardly moves (can cause this situation when cutting element encounters hard barrier during operation), this cutting element 8 overwhelming majority can enter in pocket 18.Be set to advantage and the beneficial effect with radial clearance C for by rotatable cutting element 8, please refer to above description and further describe.
Each pin 7 in 3rd structure includes lockplate 19 at each lax (loose) end (deviating from the end of the diapire of mounting base 2) place.Lockplate 19 has the elongation of circumferential edge according to mounting base 2 and slight curving shape.The length of lockplate 19 is preferably more than the diameter of the medium pore 9 of cutting element 8.Therefore, cutting element 8 easily can not cross (passing) lockplate 19.Can find out, lockplate 19 limits the motion of cutting element 8 on the axial direction of pin 7.
Cladding element 17 further provides crosses lockplate 19 and the obstacle slided from pin 7 for cutting element 8.In more detail and with particular reference to Fig. 7, the outward flange of cladding element 17 a little more than the upper surface of lockplate 19, and forms the interval 20 with preset width and shape between the outward flange and lockplate 19 of cladding element 17.
Interval 20 is sized to make cutting element 8 to pass interval 20 and to cross lockplate 19 and arrives on pin 7.When cutting element 8 is made up of flexible material, the size at interval 20 can be arranged to that cutting element 8 is passed through on pin needs cutting element 8 to produce distortion.In this case, cutting element 8 can be firmly held on pin 7.
Can find out from Fig. 6 and Fig. 7 and associated description, pin 7, lockplate 19 and cladding element 17 limit or form self-locking mechanism, are suitable for being firmly held on mounting base 2 by cutting element 8 in the normal operation period.It should be noted that in this example, self-locking mechanism additionally provides quick-change mechanism.
For further advantage and beneficial effect, please refer to above further description.
Fig. 8 illustrates the 4th cutting head constructed 1.At this, the attention difference constructed with the 3rd only should be described.To illustrate relative to composition graphs 6 and Fig. 7 and a Main Differences of the describe the 3rd structure is the type of self-locking mechanism.4th structure uses the interchangeable self-locking mechanism comprising resilient tongue 21, and this resilient tongue and pin 7 are embodied as unitary members (see Fig. 9).Resilient tongue 21 extends radially outwardly, and flushes (level) with the cladding element 17 of the upper wall limiting mounting base 2.
Under the elastic force effect that resilient tongue 21 produces, sell and promoted by the diapire (particularly pocket 18) towards mounting base 2, be preferably pushed on this diapire.Preferably, pin 7 can insert in the depressed part at diapire or pocket 18 place being formed in mounting base 2.This is favourable, because pin 7 can pass completely through the medium pore 9 of cutting element 8, and cutting element 8 firmly fixes by pin 7.
In this example, pin 7 is implemented at the free end of resilient tongue 21.But also possibly, pin is arranged on the arbitrfary point place between the free end of fixed pedestal and resilient tongue 21.
In this example, resilient tongue 21 comprises protuberance 22, and this protuberance is suitable for utilizing finger pull, to promote the free end of resilient tongue 21 and to make can freely enter pocket 18.This means to remove cutting element 8 from cutting head 1, or the mode that cutting element 8 can eventually pass through the medium pore 9 of cutting element 8 with pin 7 moves in pocket 18.
Figure 10 illustrates that finger promotes resilient tongue 21 as described above to change the schematic diagram of cutting element 8.
Figure 11 illustrates the 5th structure of the cutting head 1 with mounting base 2.Mounting base 2 has Part I 2a and Part II 2b, wherein between Part I 2a and Part II 2b, is formed with pocket 18.Part I 2a and Part II 2b are formed by the disc-shaped element be separated, and these disc-shaped elements are connected to each other in its respective central portion office.Alternatively, mounting base 2 is integrally formed by a part (such as by plastic material).Mounting base 2 has multiple recess 24, and the plurality of recess partly extends in radial directions and partly extends in circumferential direction.
Cutting element 8 is mounted to recess 24 by pin 25, and these pins can be set to nut and screw rod.When being attached to corresponding cutting element 8, the scope of the recess 24 that each pin 25 can be installed along it moves freely.Recess 24 or slit are formed as shaped form, and extend in radial direction and circumferential direction.Therefore, due to the rotary motion of mounting base 2, cutting element 8 moves to and stops at the radially outer end of recess 24.
When encountering object, the scope along recess 24 is pushed in pocket 18 by cutting element 8, and is therefore subject to protection to avoid interacting further with object.In shown figure, a cutting element 8 is in cutting position, and another cutting element 8 on the opposite side of mounting base 8 is then retracted in pocket 18 completely.
Can find out from above description, the durability of the cutting element herein proposed strengthens and can be easy to change.
The specific advantages of all embodiments shown in Fig. 6 to Figure 11 is that energy loss is lower compared with trimmer well known in the prior art.
Reference numerals list:
1 cutting head
2 mounting bases
2a Part I
2b Part II
3 central openings
4 screws
5 gears and motor shell
6 otch
7 pins
8 cutting elements
9 medium pores
10 coverings
12 ropes
14 lug bosses
15 minor axises
16 spill cutting edges
17 cladding elements
18 pocket
19 lockplates
20 intervals
21 resilient tongue
22 protuberances
23 wedges
24 recesses
25 pins
C radial clearance

Claims (15)

1. the cutting head for rotary mower (1), at least one cutting element (8) that described cutting head (1) comprises revolvable mounting base (2) and can remove, wherein, described at least one cutting element (8) is mounted to described mounting base (2) revolvably with predetermined radial clearance (C).
2. cutting head according to claim 1 (1), wherein, described radial clearance (C) is sized to make to allow described at least one cutting element (8) substantially to bounce back to the inside of the outer perimeter of described mounting base (2) completely.
3. the cutting head (1) according to any one of claim 1 and 2, wherein, the cutting element that described cutting element (8) is circular type, described cutting element preferably comprise in circumferential direction have continuous print cutting edge at least partially and/or comprise there is segmentation or toothed cutting edge (16) at least partially.
4. cutting head according to any one of claim 1 to 3 (1), wherein, described mounting base (2) comprises the self-locking mechanism being suitable for engaging with described cutting element (8) in a self-locking manner.
5. cutting head according to claim 4 (1), wherein, described self-locking mechanism comprises pin (7,25) at the outer perimeter place of described mounting base (2), and described pin is suitable for engaging with the medium pore of described cutting element (8) (9).
6. cutting head according to claim 5 (1), wherein, described mounting base (2) comprises the pocket (18) of the inner radial being positioned at described pin (7,25) at least in part, and described pocket is unlimited in a radially outward direction and is suitable for holding described cutting element (8) at least partially.
7. the cutting head (1) according to claim 5 or 6, wherein, described pin (7,25) comprises lockplate (19) at the loose end place of described pin, and described lockplate limits the motion of described cutting element (8) on the axial direction of described pin (7).
8. cutting head according to claim 7 (1), wherein, between the outward flange and described lockplate (19) of the upper wall portion of described pocket (18), form the interval (20) with preset width and shape, can arrive on described pin (7,25) through described interval (20) to make described cutting element (8).
9. the cutting head (1) according to claim 5 or 6, wherein, described self-locking mechanism comprises resilient tongue (21), described resilient tongue acts on described pin (7,25) place or described pin, to be remained on safely on described pin (7,25) by described cutting element (8).
10. cutting head according to claim 9 (1), wherein, described resilient tongue (21) extends radially outwardly relative to the rotation of described mounting base (1), and described resilient tongue preferably flushes with the upper wall of described pocket (18), wherein said pin (7,25) is preferably fixed to the outward flange of described resilient tongue (21), and described pin is promoted by the lower wall towards described pocket (18) by the elastic force effect of described resilient tongue (21).
11. according to cutting head in any one of the preceding claims wherein (1), wherein, described mounting base (2) has at least one recess (24), and wherein said at least one cutting element (8) can be mounted to described recess (24) movably, and wherein said recess (24) allows described cutting element (8) to move at least in radial directions.
12. cutting heads according to claim 11 (1), wherein, described recess (24) is formed as shaped form, and described recess extends from the radial inner portion of described mounting base (2) towards the radially outer part of described mounting base (2).
13. 1 kinds of cutting elements (8), comprise and there is the cutting body that hole particularly has medium pore (9), wherein, described cutting element (8) and described hole (9) are suitable for the cutting head (1) that is mounted to according at least one item in claim 1 to 12.
14. cutting elements according to claim 13 (8), wherein, described cutting body is dish type, be annular especially, and preferably, described cutting body comprises the outer circumferential cutting edge of continuous print, or, wherein said cutting element comprises multiple outer cut length, is spill and/or toothed cut length especially.
15. 1 kinds of rotary mowers, comprise the cutting head (1) according to any one of claim 1 to 12, wherein, described cutting head (1) is preferably suitable for removably keeping according to claim 12 to the cutting element (8) described at least one item in 13.
CN201280074480.5A 2012-07-02 2012-07-02 Cutting head for a rotary-type mower, cutting element adapted to be fitted to such a cutting head and a rotary-type mower comprising such a cutting head Pending CN104661512A (en)

Priority Applications (1)

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PCT/SE2012/050755 WO2014007688A1 (en) 2012-07-02 2012-07-02 Cutting head for a rotary-type mower, cutting element adapted to be fitted to such a cutting head and a rotary-type mower comprising such a cutting head

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CN104661512A true CN104661512A (en) 2015-05-27

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EP3794923A1 (en) * 2019-09-23 2021-03-24 CLAAS Selbstfahrende Erntemaschinen GmbH Agricultural machine

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GB1422335A (en) * 1972-03-29 1976-01-28
CN201018782Y (en) * 2007-04-14 2008-02-13 曹冬林 Regulation mechanism for clearance between cutters of harvester
WO2012036572A2 (en) * 2010-09-13 2012-03-22 Chilik Mieczysław Firma Produkcyjno-Handlowo-Usługowa Polchimet Lawn mower working head for garden work
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EP3794923A1 (en) * 2019-09-23 2021-03-24 CLAAS Selbstfahrende Erntemaschinen GmbH Agricultural machine

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EP2866545A4 (en) 2016-03-16
WO2014007688A1 (en) 2014-01-09

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