US3521434A - Lawnmower - Google Patents

Lawnmower Download PDF

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Publication number
US3521434A
US3521434A US672756A US3521434DA US3521434A US 3521434 A US3521434 A US 3521434A US 672756 A US672756 A US 672756A US 3521434D A US3521434D A US 3521434DA US 3521434 A US3521434 A US 3521434A
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US
United States
Prior art keywords
housing
lawnmower
cylinder
compartment
air
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.)
Expired - Lifetime
Application number
US672756A
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English (en)
Inventor
Heinz Emmerich
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.)
Solo Kleinmotoren GmbH
Original Assignee
Solo Kleinmotoren GmbH
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 Solo Kleinmotoren GmbH filed Critical Solo Kleinmotoren GmbH
Application granted granted Critical
Publication of US3521434A publication Critical patent/US3521434A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A01D34/63—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
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D2101/00—Lawn-mowers

Definitions

  • a lawnmower whose housing consists of cast aluminum or magnesium alloy.
  • the crank case, exhaust d-uct, fuel tank, carburetor, filter space and passages for cooling air, fuel and combustion products are integral with or are defined by a one-piece casting which constitutes the housing and is mounted on wheels.
  • the cylinder of the twostroke cycle engine is inserted into the housing in horizontal position and drives a vertical crankshaft which carries a blade and an impeller wheel serving to circulate cooling air, to support a magnet of the ignition system, and to transmit motion to the crankshaft during starting.
  • a grass evacuating duct surrounds the engine, and the impeller wheel seals the underside of the housing.
  • the upper side of the housing is closed by a detachable platelike cover.
  • the present invention relates to lawnmowers of the type wherein the blade rotates about a vertical axis. More particularly, the invention relates to improvements in power-operated lawnmowers.
  • housings of a lawnmower of an aluminum or magnesium alloy. Such housings are preferred over housings consisting of drawn sheet steel stock because they are more resistant to corrosion, less likely to produce excessive noise, lighter and of eyepleasing appearance.
  • presently known light metal housings are quite expensive and their manufacture necessitates the use of a large number of dies.
  • Another object of the invention is to provide a lawnmower which comprises fewer parts than a conventional lawnmower and which can be assembled, dismantled, cleaned, inspected and/or repaired with little loss in time.
  • a further object of the invention is to provide an improved housing for a lawnmower of the type wherein the blade rotates about a vertical axis and is driven by an internal combustion engine.
  • An additional object of the invention is to provide a lawnmower wherein several components of the internal combustion engine form an integral part of the housing.
  • a concomitant object of the invention is to provide a lawnmower wherein the fuel tank and the crankcase form integral parts of the housing.
  • my invention is embodied in a lawnmower comprising a wheel-mounted housing consisting of a one-piece metallic casting, rotary blade means, and an air-cooled internal combustion engine having a rotary output member connected with the blade means.
  • the engine further comprises a plurality of components which constitute integral parts of and/or recesses, channels, ducts, passages or like cavities provided in the one-piece housing.
  • Such components include a fuel tank, an exhaust duct for combustion products, a compartment for a portion 3,521,434 Patented July 21, 1970 of a removable cylinder which drives the output member, a crank case for the output member, a carburetor, and a casing which defines a path for the flow of cooling air to the cylinder and around other heat-sensitive components.
  • the output member further carries an impeller wheel which circulates air and is in sealing engagement with the underside of the housing just above the blade means.
  • a flat plate-like cover is detachably secured to the upper side of the housing and overlies the fuel tank, crank case, exhaust duct and one or more further components of the engine.
  • FIG. 1 is an exploded perspective view of a lawnmower which embodies my invention
  • FIG. 2 is a top plan view of the lawnmower with the cover removed and with the cylinder shown in section;
  • FIG. 3 is a longitudinal vertical section as seen in the direction of arrows from the line III-III of FIG. 2;
  • FIG. 4 is a transverse vertical section as seen in the direction of arrows from the line IVIV of FIG. 2.
  • the improved lawnmower comprises a housing 1 provided with an arcuate grass evacuating channel 2 and mounted on four wheels 3'.
  • the channel 2 surrounds a substantially circular central part of the housing 1 (see particularly FIG. 2) which accommodates a two-stroke cycle internal combustion engine.
  • Several components of the engine are integral with the central part of the housing 1 and include a crank case 4, a fuel tank 5, a cylinder compartment 6 and an. air circulating compartment 7.
  • the cylinder is shown at 8 and the space for the air cleaner or filter 50 is denoted by the numeral 9.
  • the housing 1 is provided with a depression or groove which extends between the crank case 4 and fuel tank 5.
  • This groove has a first part 10* which is the carburetor and a second part 11 which is the feed duct for admission of a combustible mixture into the cylinder 8.
  • the fuel tank 5 is located opposite an exhaust duct 12 which is separated from the crank case 4 by a heat-insulating air gap 13.
  • the cylinder compartment 6 is connected with the exhaust duct 12 by a passage 14.
  • the housing 1 defines a helical casing 15 for the engine cooler. This casing 15 communicates with the air circulating compartment 7.
  • the housing 1 further comprises mounting means 16, 17 for an ignition coil or interrupter. All of the heretofore described components 2, 47 and 9-17 form integral parts of or are defined by the housing 1.
  • This housing is a one-piece casting which preferably consists of a lightweight and corrosion-resistant aluminum or magnesium alloy.
  • the housing 1 supports a detachable cover or shroud 18 which is substantially flat and has an opening 19 for admission of fuel into the tank 5.
  • the cover 18 is further provided with slits 20 located above the gap 13 to admit fresh air.
  • the cover 18 has a recess '9 which forms an extension of the space 9 for the filter 50 and a recess 6' which forms an extension of the cylinder compartment 6. Portions or webs 21 of the cover 18 are in sealing engagement with the adjoining portion of the housing 1.
  • An overflow channel 22 is provided above the recess 6'.
  • the cylinder 8 is inserted into the air circulating compartment 7 and it also extends into the compartment 6 and extension 6'.
  • This cylinder comprises a smoothsurfaced cylindrical portion 25 which fits into the composite compartment 6, 6.
  • the cylindrical portion 25 has fuel admitting ports 23 in communication with the feed duct 11 and exhaust ports 24 in communication with the passage 14.
  • a flange 26 of the cylinder '8 is bolted to the housing 1.
  • the cooling fins 27 of the cylinder 8 are accommodated in the air circulating compartment 7.
  • the upper side of the compartment 7 is open.
  • the housing 1 is further provided with a vertical bearing sleeve 28 which extends downwardly from the crank case 4 and accommodates a portion of a crankshaft 29 which constitutes the output member of the engine.
  • the upper end of the crankshaft 29 extends into the crank case 4 and carries a crank arm 30 coupled to the piston 32 of cylinder 8 by a piston rod 31.
  • the lower end of the crankshaft 29 carries a bladed impeller wheel 33 which is surrounded by the channel 2 and closes the median portion of the underside of the housing 1.
  • the marginal portion 34 of the impeller wheel 33 forms with the housing 1 a labyrinth seal 35 which is shown in FIG. 4 and serves to prevent entry of grass into the path wherein cooling air circulates when the impeller wheel is driven by the crankshaft 29.
  • the magnet 36 of the igniter assembly is cast into the body of the impeller wheel 33 (see FIG. 1).
  • the underside 37 of the impeller wheel 33 is adjacent to a blade 38 which is affixed to the crankshaft 29 and is provided with cutters 39.
  • the cutters 39 sever grass when the engine is running and such grass is expelled through the channel 2.
  • the housing 1 also supports the shaft 40 of a starter assembly, and this shaft carries a gear 41 and a pulley 42 which can be rotated by a customary rope (not shown).
  • the starter is of the reversible type, i.e., by pulling the rope the operator causes the gear 41 to move into mesh with and to rotate a ring gear 43 on the impeller wheel 33 whereby the wheel 33 rotates the crankshaft 29 to start the engine.
  • the vanes 44 of the wheel 33 suck air through the filter 50 at the upper side of the housing 1 and such air flows through the casing 15 below the cylinder 8 and into the air circulating compartment 7 where it cools the fins 27. (Hot air is discharged upwardly at the open upper side of the compartment 7.
  • the carburetor accommodates a throttle valve 45 and an air flow regulating valve 46. These valves are installed prior to attachment of cover 18 to the housing 1.
  • a suction pipe 47 extends from the carburetor 10 into the bottom portion of the fuel tank 5.
  • An automatic fuel supply regulator 48 extends into the path of air circulated by the vanes 44 to control the delivery of fuel as a function of the engine speed.
  • FIG. 2 further shows an ignition coil 49 which is secured to the mounting means 16, 17 of the housing 1.
  • the air cleaner or filter 50 is inserted into the space 9 and also extends into the recess 9 when the cover 18 is attached to the housing. This filter is always accessible from above and its plane is preferably parallel to the axis of the crankshaft 29.
  • the lawnmower can be produced at a surprisingly low cost without affecting the quality.
  • the lawn mower is of compact and lightweight design and its height is very low so that it can be readily pushed below bushes, lowermost branches of trees and into other hard-to-reach areas.
  • the overall weight of the lawnmower is low, it can be readily handled in mowing of grass on steeply inclined grounds.
  • Such low weight also insures that the wheels 3 leave minimal traces in the lawn and renders it possible to entrust the operation of the lawnmower to women and adolescents because its manipulation requires a small effort.
  • the assembly or dismantling consumes little time because the lawnmower comprises a small number of parts. This facilitates repair and periodic inspection or cleaning.
  • the fact that the cylinder '8 is installed in horizontal position contributes to compactness and low weight of the lawnmower. Such compactness is further due to placing of the cylinder 8 between the fuel tank 5 and the exhaust duct 12, and to the fact that the cylinder -8, crank case 4, tank 5 and exhaust duct 12 occupy a circular space which is surrounded by the evacuating channel 2.
  • the carburetor 10 is located directly opposite the exhaust duct 12.
  • the housing 1 is provided with the aforementioned heat-insulating gap or gaps 13 and the impeller wheel 33 circulates coolant in areas which are likely to be overheated by exchange of heat with the duct 12. Also, the cross section of such portions of housing 1 which connect the exhaust duct 12 with adjoining parts are held to a minimum.
  • the fuel tank 5 is located directly below the feed duct 11 so that fuel can be drawn into this duct by flowing in a very short path.
  • the impeller Wheel 33 as a means for closing and sealing the central portion of the housing from below and by employing the impeller wheel as a means for transmitting motion to the piston 32 during starting and as a carrier for the magnet 36.
  • the marginal portion 34 of the impeller wheel 33 is shaped during casting of this wheel and the same applies for the adjoining portion of the housing 1 so that the formation of a satisfactory seal 35 requires no separate treatment of parts 1 and 33.
  • the blade 38 can be affixed to the crankshaft 29 and/or to the impeller wheel 33.
  • the filter 50 is accessible from the exposed upper side of the cover 18 and can be inspected or replaced at any time. Also, and since the parts 23, 24 are provided in the housing 1, the assembly of my lawnmower merely requires insertion of valves 45, 46, of a nozzle, of wheels 3, of cylinder 8, crankshaft 29, wheel 33, blade 38, starter assembly, ignition coil 50 and the fastening of cover 18. Many of those parts of the housing 1 which constitute components of the engine are substantially normalto the general plane of the housing.
  • -A lawnmower comprising a wheel mounted housing consisting of a one-piece metallic casing; rotary blade means; and an internal combustion engine comprising substantially horizontal cylinder means, a rotary output member connected with said blade means and a plurality of components constituting integral parts of said onepiece housing and including a crank case for said output member, carburetor means, a fuel tank, and an exhaust duct for combustion products, said cylinder means being removably located in a compartment provided in said housing intermediate said exhaust duct and said fuel tank.
  • a lawnmower comprising a wheel-mounted housing consisting of a one-piece metallic casting; rotary blade means; an internal combustion engine having cylinder means, a rotary output member connected to said blade means and a plurality of components including a crank case for said output member, carburetor means, a fuel tank, an exhaust duct for combustion products, and a compartment housing said cylinder means, said components constituting integral parts of said one-piece housing and having upper open ends; and a single substantially flat cover releasably connected to said housing and closing said open ends of said components.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)
  • Devices For Dispensing Beverages (AREA)
US672756A 1967-07-13 1967-10-04 Lawnmower Expired - Lifetime US3521434A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES0110818 1967-07-13

Publications (1)

Publication Number Publication Date
US3521434A true US3521434A (en) 1970-07-21

Family

ID=7530510

Family Applications (1)

Application Number Title Priority Date Filing Date
US672756A Expired - Lifetime US3521434A (en) 1967-07-13 1967-10-04 Lawnmower

Country Status (5)

Country Link
US (1) US3521434A (ja)
DE (1) DE1582405A1 (ja)
FR (1) FR1572817A (ja)
GB (1) GB1143158A (ja)
NO (1) NO118399B (ja)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594996A (en) * 1969-03-20 1971-07-27 John J Horan Low-profile and push-start lawnmowers and their engines
US3754386A (en) * 1972-03-01 1973-08-28 Montgomery Ward & Co Rotary mower
EP1419685A1 (en) * 2002-11-14 2004-05-19 Megagroup S.p.A. Lawn-mower frame
US20040261754A1 (en) * 2003-05-20 2004-12-30 Andreas Stihl Ag & Co., Kg Manually operated tool
US8191343B1 (en) * 2009-06-26 2012-06-05 Hydro-Gear Limited Partnership Systems and methods for cooling a controller assembly
US10188032B2 (en) * 2014-06-16 2019-01-29 Kubota Corporation Mower with motor cooling

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2446054A1 (fr) * 1979-01-12 1980-08-08 Commw Scient Ind Res Org Tondeuse a gazon rotative

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491630A (en) * 1946-08-05 1949-12-20 Compact Power Products Inc Engine constructed of sections bolted together along vertical plane to form an entire head, block, and crankcase thereof
US3044239A (en) * 1960-09-09 1962-07-17 Briggs & Stratton Corp Rotary power lawn mower with improved engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2491630A (en) * 1946-08-05 1949-12-20 Compact Power Products Inc Engine constructed of sections bolted together along vertical plane to form an entire head, block, and crankcase thereof
US3044239A (en) * 1960-09-09 1962-07-17 Briggs & Stratton Corp Rotary power lawn mower with improved engine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594996A (en) * 1969-03-20 1971-07-27 John J Horan Low-profile and push-start lawnmowers and their engines
US3754386A (en) * 1972-03-01 1973-08-28 Montgomery Ward & Co Rotary mower
EP1419685A1 (en) * 2002-11-14 2004-05-19 Megagroup S.p.A. Lawn-mower frame
US20040261754A1 (en) * 2003-05-20 2004-12-30 Andreas Stihl Ag & Co., Kg Manually operated tool
US7182800B2 (en) * 2003-05-20 2007-02-27 Andreas Stihl Ag & Co., Kg Manually operated tool
CN100369716C (zh) * 2003-05-20 2008-02-20 安德烈亚斯.斯蒂尔两合公司 手持加工设备
DE10322640B4 (de) * 2003-05-20 2012-08-23 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät
US8191343B1 (en) * 2009-06-26 2012-06-05 Hydro-Gear Limited Partnership Systems and methods for cooling a controller assembly
US8955296B1 (en) * 2009-06-26 2015-02-17 Hydro-Gear Limited Partnership Systems and methods for cooling a controller assembly
US9756788B1 (en) 2009-06-26 2017-09-12 Hydro-Gear Limited Partnership Systems and methods for cooling a controller assembly
US10188032B2 (en) * 2014-06-16 2019-01-29 Kubota Corporation Mower with motor cooling

Also Published As

Publication number Publication date
NO118399B (ja) 1969-12-22
DE1582405A1 (de) 1970-04-30
FR1572817A (ja) 1969-06-27
GB1143158A (en) 1969-02-19

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