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WO1992000002A1 - Tondeuse a gazon - Google Patents

Tondeuse a gazon Download PDF

Info

Publication number
WO1992000002A1
WO1992000002A1 PCT/FI1991/000199 FI9100199W WO9200002A1 WO 1992000002 A1 WO1992000002 A1 WO 1992000002A1 FI 9100199 W FI9100199 W FI 9100199W WO 9200002 A1 WO9200002 A1 WO 9200002A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
shut
mower
collecting
lawn mower
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/FI1991/000199
Other languages
English (en)
Inventor
Raimo Savipakka
Eero Poussu
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1992000002A1 publication Critical patent/WO1992000002A1/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
    • A01D43/00—Mowers combined with apparatus performing additional operations while mowing
    • A01D43/06—Mowers combined with apparatus performing additional operations while mowing with means for collecting, gathering or loading mown material
    • A01D43/077—Mowers combined with apparatus performing additional operations while mowing with means for collecting, gathering or loading mown material with auxiliary means, e.g. fans, for transporting the mown crop
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D2101/00—Lawn-mowers
    • 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
    • A01D34/63—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis

Definitions

  • the present invention relates to a collecting lawn mow ⁇ er as set forth in the preamble of claim 1.
  • the operating principle of such collecting lawn mowers involves the use of a powerful air current for carrying the mown or cut grass along a passage from a cutting space into a collecting container.
  • the air current is developed by means of a mowing or cutting blade, .having a large blade angle and possibly accompanied by a sepa ⁇ rate fan, mounted on the engine shaft.
  • the air-flow principle involves a centrifugal fan or blower, wherein the inlet air is supplied into the centre of said fan through separate air openings. Since the powerful air current carries the mown grass to the outer fringes of a cutting space, the grass is not chopped into a fine mash leading to an unsatisfactory result without the use of a collector.
  • Another drawback is that the con ⁇ tinuous use of a collector produces a substantial amount of cut waste whose composting is a problem. In addition, the lawn gets poorer with no fertilizer coming from cut grass. Another drawback is that the powerful air flow produces dust and noise and, furthermore, a collecting lawn mower cannot be used on a renewed and weak or just 'fertilized lawn because of a powerful air current. On the " other hand, a collecting lawn mower offers the bene- fit of cleaning the lawn of trash, tree leaves, twigs etc. It also collects the cut grass in a collecting container and chops larger leaves and trash to thorough ⁇ ly fill the container.
  • An object of the invention is to improve such a prior known collecting lawn mower in a manner that, if necess ⁇ ary, it can be converted into a so-called bio-mower.
  • a collecting lawn mow ⁇ er of the invention is characterized in that the inlet- air opening is provided with a shut-off means for limit ⁇ ing the air current.
  • the outlet-air opening is also provided with a shut-off means.
  • shut-off means may comprise e.g. an elec ⁇ trically controlled or mechanically adjustable air valve.
  • the electrically controlled valve may comprise e.g. a magnetic valve or a motor-operated valve.
  • the collecting lawn mowers are constructed in a manner that the collecting container is located in the trailing section of a machine.
  • the container is readily removable and the body of a machine is usually provided with a separate gate which closes a passage to the blade chamber whenever the container is detached. If necessary, such a gate can be used in itself as an outlet duct shut-off means. Closing of the outlet duct alone does not, however, produce a desired effect since the air flowing through air inlets causes the mown grass to move to the fringe of a cutting space and to travel below the edges of a machine out of said cutting space, which results in heavy dusting.
  • fig. 1 is a schematic sectional view of a lawn mower fitted with a separate blowing device
  • fig. 2 is a corresponding view of a lawn mower without a separate blowing device
  • fig. 3 shows the apparatus of fig. 1 with an air current shut-off means closed.
  • a collecting lawn mower 1 comprises a body section 10, a motor 7 along with its drive shaft 8 mounted there ⁇ on, as well as a mowing blade 2 mounted on shaft 8 and provided with a tip element 3.
  • the body section 10 is further provided with a mowing or cutting space 9 for rotating said blade elements therein.
  • the drive shaft 8 further carries a fan or a blower 4 which receives the required inlet air through an opening 5.
  • the air current builds up substantially as indicated by an arrow A carrying the mown grass towards the fringe area of cutting space 9 and further through an outlet (not shown) into a collect ⁇ ing container (not shown) .
  • the blade chamber receives some secondary air from below the edges of the blade chamber.
  • Fig. 2 is a corresponding view of a collecting lawn mow ⁇ er without a blowing device, wherein a necessary air cur- rent is produced by a suitable selection of the blade angle of a tip element 3 included in a blade 2 , the primary air current developing as indicated by an arrow B carrying the grass the same way as in fig 1 towards the fringe sections of a blade chamber 9 and further through an outlet into a collecting container.
  • Fig. 3 shows a similar mower as fig. 1 with a shut-off means 6 closed, the primary air current building up according to an arrow C carrying the mown grass in cutting space 9 upwards and towards the centre, wherein it is allowed to fall on top of blade element 2 which chops it further to as finely powdered form as possible.
  • the shut-off means 6 shown in figs. 1 - 3 may comprise e.g. an electrically controlled air valve, e.g. a mag ⁇ netic valve or a motor-operated valve. Such a valve can be readily controlled in a centralized manner from a control panel.
  • the shut-off means can also be a mechanical valve, whose control is ef ⁇ fected either from above the machine or centrally from a control panel.
  • Said control panel can be mounted e.g. on the handlebar of a lawn mower, so its operation is as simple as possible.
  • the power source for a collecting lawn mower of the "" "invention may suitably be both a conventional internal combustion engine and a mains-driven electrical motor and, in addition, a collecting lawn mower of the inven ⁇ tion can also be designed as a battery-operated con ⁇ struction.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)

Abstract

Tondeuse à gazon à collecteur d'herbes munie d'au moins un orifice d'admission d'air (5) situé sensiblement dans le plan de rotation d'une lame (2, 3), ou au-dessus de celui-ci, ainsi que d'au moins un orifice de sortie d'air menant à un récipient collecteur d'herbes. La tondeuse comprend également un dispositif (3, 4) générateur d'un écoulement d'air destiné à porter les brins d'herbe sectionnés à travers l'orifice de sortie et jusque dans le récipient collecteur. Ledit orifice d'admission d'air (5) est doté d'un dispositif obturateur (6) destiné à limiter, au besoin, l'écoulement d'air.
PCT/FI1991/000199 1990-06-26 1991-06-26 Tondeuse a gazon Ceased WO1992000002A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI903198A FI83584C (fi) 1990-06-26 1990-06-26 Graesklippare.
FI903198 1990-06-26

Publications (1)

Publication Number Publication Date
WO1992000002A1 true WO1992000002A1 (fr) 1992-01-09

Family

ID=8530695

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1991/000199 Ceased WO1992000002A1 (fr) 1990-06-26 1991-06-26 Tondeuse a gazon

Country Status (2)

Country Link
FI (1) FI83584C (fr)
WO (1) WO1992000002A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI83584C (fi) * 1990-06-26 1991-08-12 Raimo Savipakka Graesklippare.

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777271A (en) * 1955-05-03 1957-01-15 Huffman Company Grass blower attachments for lawn mowers
US2953888A (en) * 1955-08-08 1960-09-27 Lilliston Implement Company Rotary type green forage harvester
US2953887A (en) * 1957-04-03 1960-09-27 Lilliston Implement Company Rotary impeller-type harvester
US3170276A (en) * 1962-06-18 1965-02-23 Russell V Hall Air supported lawn mower
US3192692A (en) * 1960-09-22 1965-07-06 Fmc Corp Rotary mower and grass catcher
DE2528332A1 (de) * 1974-06-26 1976-01-15 Stiga Ab Grasauswurfvorrichtung an motorisch angetriebenen rasenmaehern
DD118356A1 (fr) * 1975-05-27 1976-03-05
DE3232895A1 (de) * 1982-09-04 1984-03-08 Gutbrod-Werke GmbH, 6601 Bübingen Sichelrasenmaeher mit elektrischem antrieb
FI83584B (fi) * 1990-06-26 1991-04-30 Raimo Savipakka Graesklippare.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2777271A (en) * 1955-05-03 1957-01-15 Huffman Company Grass blower attachments for lawn mowers
US2953888A (en) * 1955-08-08 1960-09-27 Lilliston Implement Company Rotary type green forage harvester
US2953887A (en) * 1957-04-03 1960-09-27 Lilliston Implement Company Rotary impeller-type harvester
US3192692A (en) * 1960-09-22 1965-07-06 Fmc Corp Rotary mower and grass catcher
US3170276A (en) * 1962-06-18 1965-02-23 Russell V Hall Air supported lawn mower
DE2528332A1 (de) * 1974-06-26 1976-01-15 Stiga Ab Grasauswurfvorrichtung an motorisch angetriebenen rasenmaehern
DD118356A1 (fr) * 1975-05-27 1976-03-05
DE3232895A1 (de) * 1982-09-04 1984-03-08 Gutbrod-Werke GmbH, 6601 Bübingen Sichelrasenmaeher mit elektrischem antrieb
FI83584B (fi) * 1990-06-26 1991-04-30 Raimo Savipakka Graesklippare.

Also Published As

Publication number Publication date
FI83584C (fi) 1991-08-12
FI903198A0 (fi) 1990-06-26
FI83584B (fi) 1991-04-30

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