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WO1996004776A1 - Appareils agricoles de recolte et denture pour de tels appareils - Google Patents

Appareils agricoles de recolte et denture pour de tels appareils Download PDF

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Publication number
WO1996004776A1
WO1996004776A1 PCT/GB1995/001889 GB9501889W WO9604776A1 WO 1996004776 A1 WO1996004776 A1 WO 1996004776A1 GB 9501889 W GB9501889 W GB 9501889W WO 9604776 A1 WO9604776 A1 WO 9604776A1
Authority
WO
WIPO (PCT)
Prior art keywords
toothing
elements
teeth
stripper
drum
Prior art date
Application number
PCT/GB1995/001889
Other languages
English (en)
Inventor
Keith Howard Shelbourne
Paul John Mccredie
Original Assignee
Shelbourne Reynolds Engineering Ltd.
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
Priority claimed from GB9416199A external-priority patent/GB9416199D0/en
Priority claimed from GBGB9500531.0A external-priority patent/GB9500531D0/en
Application filed by Shelbourne Reynolds Engineering Ltd. filed Critical Shelbourne Reynolds Engineering Ltd.
Priority to AU31871/95A priority Critical patent/AU3187195A/en
Priority to EP95927882A priority patent/EP0774891A1/fr
Publication of WO1996004776A1 publication Critical patent/WO1996004776A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D41/00—Combines, i.e. harvesters or mowers combined with threshing devices
    • A01D41/06—Combines with headers

Definitions

  • This invention relates to crop strippers and the rotary drums of such strippers used for detaching crops to be harvested from standing plants .
  • Such crop strippers are best known for stripping grain from the heads of cereal crops such as wheat, and seed from herbage crops such as grass, but they can also be arranged to harvest other grain or seed crops, or to strip leaves, young shoots or blossom, for example, from the stems of crops.
  • the drums of crop strippers are provided at the periphery with stripper teeth arranged in a series of axial rows or combs each made up of a number of similar comb plates butted end to end.
  • stripper teeth arranged in a series of axial rows or combs each made up of a number of similar comb plates butted end to end.
  • the teeth of the stripper drum should not remove significant quantities of unwanted parts of the plants, in particular the stems, because that can interfere with the collection of crop that is being collected, and because they must subsequently be separated to be discarded.
  • the efficiency of operation in this respect is dependent, to some extent at least, on an ability of the stripper teeth to yield to the resistance of the plant stems through which they are drawn. It is also necessary for the teeth to be able to yield to avoid damage when they strike obstacles on the ground.
  • the comb plates of a thermoplastic material, which provides a high degree of flexibility and also causes little if any damage to the crop stems because it is a relatively soft material.
  • This latter property means that the teeth wear very rapidly in some crops and require frequent replacement.
  • metal teeth have not been employed in practice because of the damage they do to the crop stems and their liability to be damaged by accidental impact on account of their greater stiffness.
  • metal toothing elements are provided, each having a plurality of teeth, the tooth profile comprising a radially outwardly tapering portion and a root portion inwardly of said tapering portion where the spacing between adjacent teeth increases to form a root opening with a maximum width greater than a radially outer neck of said opening, the teeth having an essentially continuous rearward flange running along the edges of the said profile including said root portions, and said toothing elements being arranged to be flexibly yieldable circumferentially of the drum.
  • said rearward flange is formed with an essentially constant radius junction between it and a main body of the toothing element from which it extends.
  • the flanged formation of the tooth profile allows the toothing elements to be produced from a relatively thin sheet metal but is able to avoid, or at least substantially reduce, the damage to crops that stripper teeth of such a material have previously caused.
  • the provision of such a continuous flange would be regarded as undesirable because of the resulting increase of stiffness, it is possible to provide a required degree of flexibility through the mountings of the toothing elements, or preferably by arranging that a portion of each toothing element radially inwards of the teeth themselves to have sufficient flexibility.
  • a toothing element made of sheet metal, in particular of spring steel can be arranged to be yieldable circumferentially to a sufficient degree by allowing the elements to flex in a region between said tooth roots and a radially innermost edge portion by means of which the element is secured to its drum.
  • Said main body may conveniently be planar, but if required, the flexibility of said region can be enhanced by at least one corrugation extending generally parallel to the rotary axis of the drum and/or one or more apertures in this region of the element. It is usually desirable to keep the radius of curvature of the edge profile small to promote efficient stripping action, but the limits of ductility of the tooth material may dictate the minimum radius of curvature.
  • the radius of curvature is proportional to the thickness of the material and is thus also related to the tooth stiffness. This can make it difficult to obtain optimum values for both the radius of curvature of the tooth edge profile and tooth stiffness. It is possible to overcome this problem by providing one or more backing elements at the rear of a toothing element having the flanged edge profile, the or each said backing element having at least one tooth-like projection with a profile that lies within the edge profile of a tooth of its associated toothing element.
  • the backing elements can be of a similar material to the toothing elements, in particular a sheet metal such as spring steel . Depending upon the degree of stiffening required they can be of the same or of a different thickness sheet to that of the toothing elements and they can be placed in multiple layers behind the toothing element.
  • a stripper drum will usually have a series of toothing elements according to the invention jointed end to end in the or each row of stripping teeth, because of the overall length of the drum.
  • a guard strip is preferably placed in front of the elements of each row of teeth in order to shield the junctions between adjacent elements.
  • backing elements are provided for the toothing, these can be utilized alternatively or additionally to a front guard strip to protect joints between successive toothing elements from trapping excessive amounts of foreign matter and/or to lock the toothing elements in place.
  • a toothing element for a crop stripper drum having a radially innermost base portion to be held between opposed support faces of the drum by releasable clamping means passing through the base portion and said support faces, the base portion of the element being provided with at least one slot opening into a radially innermost edge of the element to receive said clamping means by sliding the element base portion between said opposed support faces while the clamping means are in position in said faces, and at least one locking device, said device or devices of the toothing element being one of cooperating recess and projection elements provided in the toothing element and said support faces respectively for locking the element positively in the radial direction when it is gripped between said faces by the clamping means.
  • guard strips are provided, as described above, that strip can also be provided with elements of said locking devices to hold the toothing elements in place.
  • toothing element is of sheet metal
  • its locking device element or elements can conveniently be bent out from the sheet in the form of a tongue or tongues. It is to be understood, however, that in this aspect the invention is also applicable to toothing elements of other materials such as plastics, with which the locking devices may be more conveniently formed in other ways.
  • That element of the or each said cooperating device which is on a toothing element to be located at end edges of the toothing element. If for example the projections of said cooperating devices are adjacent the abutting faces of successive toothing elements they can be located in a common recess in the margins of both elements adjoining said abutting faces, so simplifying the production of the support face having the recesses.
  • the locking devices may comprise an element or elements on said strip and/or backing element for cooperation with a complementary formation on the toothing element.
  • the toothing element may be arranged to be clamped by a single clamping member centrally of its length with one or more locking devices to each side of the clamping element and spaced therefrom.
  • Fig. 1 is a radial section of a crop stripper drum
  • Fig. 2 illustrates to a larger scale the area circled in Fig. 1,
  • Fig. 3 is a rear view on a series of comb plates sections and their guard plate
  • Fig. 4 is a larger scale sectional view of line IV-IV in Fig. 3.
  • Fig. 5 is a rear view of a backing element for a stripper drum with some of its associated toothing elements, and also illustrates a modification of those elements,
  • Fig. 6 is a radial section of a crop stripper drum showing the assembly of toothing and backing elements of Fig. 5 on the drum
  • Fig. 7 is a larger scale illustration of the circled area in Fig. 6, and
  • Fig. 8 is a sectional view on the line A-A in Fig. 5.
  • Fig. 1 illustrates diagrammatically the construction of the outer shell of a stripper rotor drum which is supported on a central rotary shaft (not shown) to rotate in the arrowed direction.
  • the shell comprises a series of axially extending cover plates 2 which form the peripheral surface of the drum body.
  • Each cover plate is a Z-section member with a main web 4 generally tangential to the rotary axis and from the leading and trailing edges of which project a pair of generally radial wings 6,8.
  • the wing 6 at the leading edge of the web. is directed outwards and the trailing edge wing 8 is directed inwards.
  • the wings 6,8 of adjacent cover plates 2 lie parallel to each other at a small spacing apart.
  • toothed comb plates 10 and guard strips 12 are inserted, the comb plates and the guard strips both being mounted in end-to-end series extending along the length of the drum.
  • Each comb plate is pressed from a thin (0.6 mm) spring steel plate. It is given a comb profile of a generally conventional form comprising a series of tapering teeth 14 with bulbous openings 16 between the tooth roots. In the pressing operation, the profile is formed with a small rearwardly directed flange 18 that extends continuously along the toothed profile, including the bulbous root openings 16.
  • the inside radius at the root of the flange is preferably not substantially more than three times the metal thickness.
  • the height of the flange is preferably not substantially less than 4 mm, measured from the front face of the tooth.
  • the flange 18 increases the stiffness of the comb plate 10 over the height of the tooth profile but the inner margin 22 of the plate between the profile 14,16 and the shorter wing 6 behind the comb plate remains planar and the thin spring steel has considerable flexibility in the circumferential direction of the rotor drum.
  • a comb plate can deflect rearwards if it strikes an obstacle on the ground, as a result of the flexibility of the inner margin 22.
  • the inner margin 22 of the toothing element can be given one or more corrugations 24 or a series of apertures 24a.
  • the radially outer edge of the wing 6 is radiused rearwards to spread its loading on the flexed comb plate.
  • the arrangement offers several advantages compared with conventional comb plates of plastics. These relatively soft and flexible materials have been used because they do little damage to the standing plants and because they flex easily if they strike obstacles, such as stones.
  • the spring steel comb plate has a much longer operational life because of the resistance of the metal to abrasion.
  • the flanged edges of the comb profile present a smooth face to the crop and are found to be surprisingly effective in reducing the potential for crop damage that has hitherto made the use of metal comb plates impractical for many crops.
  • each row of teeth is made up from a number of short, usually identical, comb plates, as is illustrated in Fig. 3.
  • the edges of the plates can be butted closely to each other to form an essentially continuous face, if one section is subjected to a greater load than its neighbour, eg. because its teeth have struck an isolated obstacle such as a large stone, a gap opens momentarily between the edges of the adjacent sections. There is then a risk that parts of the crop will lodge in the gap and be trapped when the section springs back, so leaving the gap open. There can then be a progressive build-up of material trapped in the gap, to the extent that the operation of the stripper is disrupted.
  • the guard strip 12 is sandwiched between the front face of the comb plates 10 and the trailing wing 6 of the cover plate.
  • the guard strip 12 extends over the inner margin of the comb plates, its outer edge lying at the same radius from the drum centre as the bulbous root openings.
  • the guard strip therefore does not alter the active or stripping profile of comb plate but merely overlies the butt joints between comb plates at the centres of the root openings. That is sufficient for it to be able to cover the gaps that will open from time to time between the comb plates.
  • the guard strip can be of a softer and thinner material than the comb plate itself, but is preferably also of metal.
  • comb plates Although the comb plates described have the potential for a long operational life, it is necessary to replace the plates from time to time. However, because of the high loadings they experience, both from centrifugal forces and from the resistance of the crop through which they move, they must be locked firmly in place. For these reasons, comb plates are conventionally provided with a number of holes for screw bolts by means of which they are located and clamped between the drum cover plate wings. To replace a comb plate, therefore, the bolts securing it are first removed from the drum to allow the damaged plate to be slipped out, a new plate is put in place and its bolt holes registered with the bolt holes in the cover plate wings, and finally the bolts are reinserted and re-attached to their captive nuts and tightened. This procedure can result in considerable downtime, particularly if it must be repeated with a number of comb plates.
  • each comb plate is obtained using a single bolt 30 which extends through holes 32,34 in the opposed wings 6,8 and similar holes 36 the guard plate but through a central open slot 38 in the each comb plate, the slot extending to the inner edge of the plate.
  • the plate also has a pair of tabs 40 formed by U-shaped cuts and pressed out from the spring steel plate about a radially inner bending line.
  • the guard strip 12 is provided with a further series of holes 42 of a complementary profile in which the tabs 40 can be located.
  • comb plates may have holes or recesses engaged by projections in the co-operating locking parts, instead of the tabs that seat in holes or recesses in those parts.
  • a backing element 52 is provided in the form of an elongate strip having a series of similar projections 54 at the same pitch as the teeth 56 of a number of toothing elements 58 with which it is associated.
  • the projections 54 are, however, narrower and shorter than the teeth 56, and the recesses 60 between them are slightly deeper than the recesses 62 between the teeth, • so that they fit within the profile of the toothing elements as defined by the flanging 64 that extends continuously along the profiled edges of the teeth.
  • the stripper drum 70 is constructed using a series of cover plates 72 in the manner described in the first embodiment. At equally spaced positions around its periphery groups of toothing elements 58 form rows of stripper teeth along the length of the drum as before but now groups of backing elements 52 also extend the length of the drum behind the rows of teeth.
  • each backing element 52 In the base region of each backing element 52 a series of holes 74 are provided to receive bolts 76 securing the elements in place on the stripper drum. Alternating with the holes 76 are elongate slots 78 at the same pitch as the I'ength of the toothing elements 58. These slots have an elongate rectangular form with rounded corners.
  • the toothing elements 58 are essentially similar to those described in the first embodiment but locking tabs 82 replacing the tabs 40 are pressed out from the element at its opposite ends rather than intermediate the length of the element.
  • Fig. 5 illustrates how adjoining tabs 82 of two succeeding toothing elements locate in a common slot 78 in the backing element.
  • the edge of the toothing element can have a radiused indent 84 to improve the stress distribution under flexure.
  • the toothing elements also have slots 86 which are coincident with the bolt holes 74 and which open into the radially inner edges of the elements.
  • the toothing and backing elements are clamped between wings of the Z- section cover plates 72 of the rotor drum by the bolts 76.
  • the backing elements 52 are located radially and axially by the bolts 76 passing through their bolt holes 74.
  • the bolts 76 also engages the slots 86 of the toothing elements 58 to locate those elements axially but positive radial location of the toothing elements is provided by the tabs seating in the backing element slots. Removal and insertion of the toothing elements can be carried out in the manner already described, when the bolts 76 are slackened off.
  • the backing elements 52 which are considerably longer than the toothing elements 58, are so arranged that their butted ends do not coincide with the butting joints between successive toothing elements. Should one of the toothing elements flex rearwards more than its neighbour, eg. because it has struck an obstacle, because the joint between the two elements is bridged by the associated backing element, there is less tendency for a gap to open between them and any such gap has the backing element overlying it. If it is necessary to provide .some protection against the entry and trapping of foreign matter when such gaps develop, therefore, the backing elements may replace the guard strips 12.
  • the backing elements 52 allow a greater choice of stiffness for the toothing elements independently of the material and form of the toothing elements 58. They do not have to be made of the same material as the toothing elements.
  • the example shows a single backing element as the rear support for each stripping finger, it is possible to provide backing elements in multiple layers, possibly of different radial dimensions, to provide further choice in the stiffness characteristics of the drum toothing.
  • backing elements with longer projections 54 can themselves be backed by elements with shorter projections so that they have the combined effect of raising the stiffness increasingly towards the radially inner ends of the toothing.
  • Fig. 5 also illustrates a modification of the toothing elements, shown in more detail in Fig. 8, in which the flange 64 along the profiled edge is interrupted at the angular transitions 88 between the bulbous openings and the tapering teeth.
  • This makes manufacture of the elements easier and can help to reduce stress concentrations.
  • a radial corrugation or rib 90 in each tooth extends past the angular transitions.
  • the corrugations 90 complement the backing elements 52.
  • the stiffening provided by the corrugations may not be necessary if backing elements are also employed.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Soil Working Implements (AREA)

Abstract

Cette invention se rapporte à un appareil agricole de récolte comportant un tambour rotatif avec des rangées de dents d'arrachage (14) formées par des éléments de denture (10), lesquels sont fabriqués en tôle et comportent un bord arrière essentiellement continu (18) longeant les arêtes des dents. Les éléments de denture comportent une marge interne flexible (22), située radialement vers l'intérieur par rapport aux dents, afin de permettre à celles-ci de fléchir lorsqu'elles heurtent un obstacle. Les éléments de denture présentent des fentes (38) ouvertes sur leurs bords radialement internes, pour pouvoir coulisser sur des boulons de serrage (30), tandis que ces boulons restent en place sur le tambour. Des saillies et des évidements de blocage (40, 42), situés entre les éléments de denture et leurs faces de serrage, assurent une fixation ferme des éléments de denture, lorsque les boulons sont serrés.
PCT/GB1995/001889 1994-08-11 1995-08-10 Appareils agricoles de recolte et denture pour de tels appareils WO1996004776A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU31871/95A AU3187195A (en) 1994-08-11 1995-08-10 Crop strippers and stripper toothing
EP95927882A EP0774891A1 (fr) 1994-08-11 1995-08-10 Appareils agricoles de recolte et denture pour de tels appareils

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9416199A GB9416199D0 (en) 1994-08-11 1994-08-11 Crop strippers and stripper toothing
GB9416199.9 1994-08-11
GBGB9500531.0A GB9500531D0 (en) 1995-01-11 1995-01-11 Crop strippers
GB9500531.0 1995-01-11

Publications (1)

Publication Number Publication Date
WO1996004776A1 true WO1996004776A1 (fr) 1996-02-22

Family

ID=26305436

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/001889 WO1996004776A1 (fr) 1994-08-11 1995-08-10 Appareils agricoles de recolte et denture pour de tels appareils

Country Status (3)

Country Link
EP (1) EP0774891A1 (fr)
AU (1) AU3187195A (fr)
WO (1) WO1996004776A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976315A2 (fr) 1998-07-24 2000-02-02 Shelbourne Reynolds Engineering Ltd. Appareil de récolte et denture pour de tels appareils
RU187654U1 (ru) * 2018-07-30 2019-03-14 Михаил Андреевич Федин Ротор очёсывающего оборудования
WO2020069611A1 (fr) * 2018-10-02 2020-04-09 Les Machineries Pronovost Inc. Panier à peigne et ensemble nettoyeur pour un système de récolte d'asclépiade, et ledit système de récolte
US11071255B2 (en) 2018-03-13 2021-07-27 Deere & Company Wear resistant precutter knife
WO2024006485A1 (fr) * 2022-06-29 2024-01-04 Applequist Mfg., Inc. Rotor d'extraction de récolte avec système d'alignement et de montage pour sections de dents d'extraction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0316969A2 (fr) * 1984-09-27 1989-05-24 Btg International Limited Appareil et méthodes pour moissonner
WO1992003037A1 (fr) * 1990-08-14 1992-03-05 Klinner Wilfred E Moyens et procedes destines a assujettir et a proteger des elements entrant en engagement avec des produits de recolte
WO1992008339A1 (fr) * 1990-11-12 1992-05-29 Shelbourne Reynolds Engineering Ltd. Systemes utilises pour la recolte des cultures

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0316969A2 (fr) * 1984-09-27 1989-05-24 Btg International Limited Appareil et méthodes pour moissonner
WO1992003037A1 (fr) * 1990-08-14 1992-03-05 Klinner Wilfred E Moyens et procedes destines a assujettir et a proteger des elements entrant en engagement avec des produits de recolte
WO1992008339A1 (fr) * 1990-11-12 1992-05-29 Shelbourne Reynolds Engineering Ltd. Systemes utilises pour la recolte des cultures

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976315A2 (fr) 1998-07-24 2000-02-02 Shelbourne Reynolds Engineering Ltd. Appareil de récolte et denture pour de tels appareils
EP0976315A3 (fr) * 1998-07-24 2000-05-10 Shelbourne Reynolds Engineering Ltd. Appareil de récolte et denture pour de tels appareils
US6315659B1 (en) 1998-07-24 2001-11-13 Shelbourne Reynolds Engineering Crop strippers and stripper toothing
AU759771B2 (en) * 1998-07-24 2003-05-01 Shelbourne Reynolds Engineering Ltd Crop strippers and stripper toothing
US11071255B2 (en) 2018-03-13 2021-07-27 Deere & Company Wear resistant precutter knife
RU187654U1 (ru) * 2018-07-30 2019-03-14 Михаил Андреевич Федин Ротор очёсывающего оборудования
WO2020069611A1 (fr) * 2018-10-02 2020-04-09 Les Machineries Pronovost Inc. Panier à peigne et ensemble nettoyeur pour un système de récolte d'asclépiade, et ledit système de récolte
WO2024006485A1 (fr) * 2022-06-29 2024-01-04 Applequist Mfg., Inc. Rotor d'extraction de récolte avec système d'alignement et de montage pour sections de dents d'extraction

Also Published As

Publication number Publication date
EP0774891A1 (fr) 1997-05-28
AU3187195A (en) 1996-03-07

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