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WO1990013220A1 - Lame inferieure d'une unite de tondeuse a gazon - Google Patents

Lame inferieure d'une unite de tondeuse a gazon Download PDF

Info

Publication number
WO1990013220A1
WO1990013220A1 PCT/GB1990/000696 GB9000696W WO9013220A1 WO 1990013220 A1 WO1990013220 A1 WO 1990013220A1 GB 9000696 W GB9000696 W GB 9000696W WO 9013220 A1 WO9013220 A1 WO 9013220A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
block
bottom block
assembly
block assembly
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.)
Ceased
Application number
PCT/GB1990/000696
Other languages
English (en)
Inventor
Edward John Aldred
John Mills
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.)
Ransomes Sims and Jeffries Ltd
Original Assignee
Ransomes Sims and Jeffries 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
Application filed by Ransomes Sims and Jeffries Ltd filed Critical Ransomes Sims and Jeffries Ltd
Publication of WO1990013220A1 publication Critical patent/WO1990013220A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/42—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a horizontal axis, e.g. cutting-cylinders
    • A01D34/62—Other details
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/42—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a horizontal axis, e.g. cutting-cylinders
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D2101/00—Lawn-mowers

Definitions

  • the present invention consists in a bottom block assembly for a grass cutting unit having a rotating cutter reel, the assembly comprising an elongate bottom block adapted for mounting horizontally in the grass cutting unit and an elongate blade secured to the bottom block and adapted in use to present a transverse cutting edge for cooperation with the rotating reel; wherein the blade comprises a thickened mounting portion remote from the cutting edge, said portion providing first and second blade abutments spaced in a generally vertical direction and each extending along the length of the blade, wherein the bottom block is provided with first and second block abutments positioned for engagement with the respective blade abutments and wherein fastener means are provided which act along a line extending between the blade abutments to draw together the blade and the bottom block.
  • the blade and the bottom block are provided with respective comple entarily engaging parts serving to prevent relative displacement in a generally vertical direction.
  • said complementarily engaging parts comprise respectively a tongue and a groove.
  • the blade and the bottom block present smooth upper surfaces which are contiguous.
  • Figure 1 is a perspective view of a first bottom block assembly according to the prior art
  • Figure 2 is a perspective view of a second bottom block assembly according to the prior art.
  • Figure 3 is a perspective view of a bottom block assembly according to the present invention.
  • Figure 4 is a transverse section on the bottom block assembly of Figure 3.
  • FIG. 1 a conventional bottom block assembly having a bottom block 10 of substantial angle cross section and a bottom blade 12 in the form of a relatively thin strip.
  • the blade is secured to a bottom block through screws, rivets or other suitable fastening devices at the locations shown at 14.
  • This invention relates to grass cutting units of the type having a rotating cutter reel and is more particularly concerned with a bottom blade for use in such a cutting unit.
  • a common bottom block assembly comprises a substantial bottom block of angle section to which is bolted a bottom blade in the form of relatively thin strip.
  • the blade is bolted to the bottom block from beneath and extends forwardly to an upturned lip which provides the cutting edge.
  • This arrangement although common, has a number of significant drawbacks. With a portion of the relatively thin blade effectively cantilevered forwardly of the bottom block, there is a tendency for the blade cutting edge to deflect vertically. Upward deflection can lead to premature wear of the bottom blade and cutter reel whilst downward deflection causes the cutting unit to jam more easily. It has been proposed to add stiffening pieces to the bottom block assembly, but this has not been totally satisfactory. It has further been proposed to form the bottom blade integrally with the bottom block, but since the bottom blade requires periodic replacement on wear, an integral arrangement is too costly unless very thin sections are used for the bottom block, in which case the problem of lack of rigidity is exacerbated.
  • the blade is formed with a lip serving to produce a transverse cutting edge 16 for cooperation with the cutter reel.
  • a cutting edge of appropriate land width can be defined in a generally flat blade by a transverse groove spaced a short distance from the blade edge.
  • FIG. 2 An alternative known construction is shown in Figure 2.
  • the assembly is formed integrally of relatively thin material defining a blade 18 having a cutting edge 20 and a block 22 of triangular section.
  • a filler plate 2k is sometimes inserted at the base of the block 22.
  • the bottom blade 50 is of generally triangular section having at the apex an upturned lip 52 providing a cutting edge 54.
  • the base of the triangular section is formed with a tongue 56 extending longitudinally of the blade and delimiting an upper blade abutment surface and a lower blade abutment surface 60. These abutment surfaces are generally co-planar and are inclined at a slight angle to the vertical.
  • the bottom blade is provided with threaded blind apertures 62 which extend through the tongue 56.
  • the bottom block 64 has a truncated triangular section with a central void 66.
  • the forward edge of the block is provided with a groove 68 separating upper and lower block abutment surfaces 70 and 72 respectively.
  • the groove 68 and block abutment surfaces 70, 72 are shaped and dimensioned so as to provide a complementary engagement with the tongue 56 and blade abutment surfaces 58, 60, of the bottom blade.
  • Pairs of apertures 7 and 76 are provided in the bottom block and aligned with the respective blind apertures 62 in the bottom blade.
  • a series of bolts 78 extend through these apertures and threadily engage the bottom blade so as to draw together the blade and bottom block. It will be noted that in the region of the head of bolt 78, the bottom block 64 is recessed to provide ready access to the bolt.
  • bottom block assembly is generally wedge shaped, optimum use can be made of the available space between the cutting reel and ground so as to give maximum rigidity in the assembly both torsionally and in bend.
  • the smooth and continuous upper surfaces of the blade and of the block also promote efficient discharge of cut grass.
  • the bottom blade is of increased inherent stiffness as compared to blades, for example, as shown in Figure 1, it becomes possible to use fewer fastener devices. Since the fastener devices extend generally horizontally, that is to say at an angle to the horizontal of less than 45 and preferably 30 or less, they do not need to be finished flush with the underside of the assembly. A more positive purchase can therefore be provided. Moreover, there is no possibility of the head of the bolt or other fastener being worn through contact with the ground, thereby further increasing the difficulties of removal.
  • the tongue and groove formations on the blade and bottom block serve the useful purpose of providing a positive key.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

Un ensemble de lame/bloc cunéiforme pour une tondeuse de gazon du type à cylindre est doté d'une languette (56) disposée dans la lame (50) et s'emboîtant dans une rainure (68) dans le bloc inférieur. Des portées (58, 60, 70, 72) situées au-dessus de la languette (56) et au-dessous de celle-ci résistent aux formes verticales appliquées au tranchant (54). Une série de boulons sensiblement horizontaux agissant à travers la languette (56) et la rainure (68) servent à immobiliser la lame sur le bloc inférieur tout en permettant le remplacement de ladite lame lorsqu'elle est usée.
PCT/GB1990/000696 1989-05-05 1990-05-04 Lame inferieure d'une unite de tondeuse a gazon Ceased WO1990013220A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB898910377A GB8910377D0 (en) 1989-05-05 1989-05-05 Bottom blade for grass cutting unit
GB8910377.4 1989-05-05

Publications (1)

Publication Number Publication Date
WO1990013220A1 true WO1990013220A1 (fr) 1990-11-15

Family

ID=10656288

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/000696 Ceased WO1990013220A1 (fr) 1989-05-05 1990-05-04 Lame inferieure d'une unite de tondeuse a gazon

Country Status (5)

Country Link
EP (1) EP0470997A1 (fr)
JP (1) JPH04504954A (fr)
CA (1) CA2054760A1 (fr)
GB (1) GB8910377D0 (fr)
WO (1) WO1990013220A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB238130A (en) * 1925-01-10 1925-08-13 Moto Mower Company Improvements in motor driven lawn mowers
US2491885A (en) * 1947-06-20 1949-12-20 Wilkerson Louie Lawn mower attachment
US2496973A (en) * 1946-03-16 1950-02-07 Edward H Worthington Bed knife for lawn mowers
US2508060A (en) * 1945-12-13 1950-05-16 Herbert F Dalglish Lawn mower
US2624169A (en) * 1951-04-10 1953-01-06 Atlas Press Company Cutter blade support for lawn mowers
GB847328A (en) * 1958-05-23 1960-09-07 Toro Mfg Corp Improvements in or relating to lawn-mowers
US3040504A (en) * 1958-04-29 1962-06-26 Mcculloch Corp Power lawn mower and steering means therefor
US3267654A (en) * 1964-09-04 1966-08-23 Yard Man Inc Front mounting for reel type mower
NL6800415A (fr) * 1967-01-16 1968-07-17
NL6813266A (fr) * 1967-09-18 1969-03-20
DE2101518A1 (fr) * 1971-01-14 1972-07-27

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB238130A (en) * 1925-01-10 1925-08-13 Moto Mower Company Improvements in motor driven lawn mowers
US2508060A (en) * 1945-12-13 1950-05-16 Herbert F Dalglish Lawn mower
US2496973A (en) * 1946-03-16 1950-02-07 Edward H Worthington Bed knife for lawn mowers
US2491885A (en) * 1947-06-20 1949-12-20 Wilkerson Louie Lawn mower attachment
US2624169A (en) * 1951-04-10 1953-01-06 Atlas Press Company Cutter blade support for lawn mowers
US3040504A (en) * 1958-04-29 1962-06-26 Mcculloch Corp Power lawn mower and steering means therefor
GB847328A (en) * 1958-05-23 1960-09-07 Toro Mfg Corp Improvements in or relating to lawn-mowers
US3267654A (en) * 1964-09-04 1966-08-23 Yard Man Inc Front mounting for reel type mower
NL6800415A (fr) * 1967-01-16 1968-07-17
NL6813266A (fr) * 1967-09-18 1969-03-20
DE2101518A1 (fr) * 1971-01-14 1972-07-27

Also Published As

Publication number Publication date
EP0470997A1 (fr) 1992-02-19
CA2054760A1 (fr) 1990-11-06
GB8910377D0 (en) 1989-06-21
JPH04504954A (ja) 1992-09-03

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