GB1585046A – Lawn mower
– Google Patents
GB1585046A – Lawn mower
– Google Patents
Lawn mower
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Info
Publication number
GB1585046A
GB1585046A
GB21042/78A
GB2104278A
GB1585046A
GB 1585046 A
GB1585046 A
GB 1585046A
GB 21042/78 A
GB21042/78 A
GB 21042/78A
GB 2104278 A
GB2104278 A
GB 2104278A
GB 1585046 A
GB1585046 A
GB 1585046A
Authority
GB
United Kingdom
Prior art keywords
hood
lawn mower
roller
mower according
shaft
Prior art date
1978-05-22
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
Application number
GB21042/78A
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.)
Blatchford W C
Original Assignee
Blatchford W C
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.)
1978-05-22
Filing date
1978-05-22
Publication date
1981-02-18
1978-05-22
Application filed by Blatchford W C
filed
Critical
Blatchford W C
1978-05-22
Priority to GB21042/78A
priority
Critical
patent/GB1585046A/en
1979-05-15
Priority to SE7904247A
priority
patent/SE7904247L/en
1979-05-18
Priority to DE19792920238
priority
patent/DE2920238A1/en
1979-05-22
Priority to DK209179A
priority
patent/DK209179A/en
1979-05-22
Priority to AU47286/79A
priority
patent/AU526745B2/en
1979-05-22
Priority to FR7913006A
priority
patent/FR2426394A1/en
1979-05-22
Priority to IT7949119A
priority
patent/IT7949119D0/en
1979-05-22
Priority to US06/041,533
priority
patent/US4510738A/en
1981-02-18
Publication of GB1585046A
publication
Critical
patent/GB1585046A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
A01D34/695—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 supported by an air cushion
A—HUMAN NECESSITIES
A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
A01D—HARVESTING; MOWING
A01D2101/00—Lawn-mowers
Description
PATENT SPECIFICATION
( 11) 1 585 046 ( 21) Application No 21042/78 ( 22) Filed 22 May 1978 ( 44) Complete Specification Published 18 Feb 1981 ( 51) INT CL 3 AO 1 D 35/26 ( 52) Index at Acceptance A 1 F FF ( 54) LAWN MOWER ( 71) I, WILLIAM CHARLES BLATCHFORD, a British subject, of 4 Dyers Buildings, Holborn, London, EC 1 N 2 JT, England do hereby declare the invention (which has been communicated to me by Flymo S A, a Swiss body corporate, of Altenstrasse 12, CH 6301 Zug, Switzerland) for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly de-
scribed in and by the following statement:-
This invention relates to a lawn mower of the type which in operation is supported on a cushion of air and comprises a knife which is rotated about a vertical axis by a driving unit, and a fan wheel rotating about the same axis, the knife and fan wheel being shrouded by a hood having one or more than one inlet opening for air to the air cushion.
Lawn mowers of this type are previously known, for instance in British Patent No.
929,610 Due to the fact that this type of lawn mower has no wheels but floats on a cushion of air it has the advantage that it can be easily moved over a lawn The only resistance it has to overcome is that which is created by the friction of un-cut grass blades against the lower front part of the hood.
This resistance can be considerable when cutting tall and heavy grass The object of this invention is to reduce this resistance and make the mower easy to handle.
The above object is achieved in that the hood in its front part has one or more than one roller.
The invention will now be described by way of example with reference to the accompanying drawing, in which Figure 1 is a perspective view of a lawn mower in accordance with the invention, and Figure 2 is a vertical section to a larger scale through part of the mower.
As can be seen in Figure 1, the lawn mower has a hood 10 and a handle 11 pivotally supported on the hood The hood shrouds a fan wheel, not shown, which together with a knife 12 is fastened to the lower part of a vertical driving shaft The driving unit is placed on the hood 10 and is surrounded by a cover 13 The driving unit indicated in Fig 1 is an electric motor which via a cable 14 is connected to a switch 15 on the handle 11 The switch 15 is via a long cable 16 connected to a current source.
Instead of using an electric motor it is possible to use an internal combustion engine.
The hood 10 has an outer peripheral rim 17, which completely surrounds the hood and the lower part of which is situated in a horizontal plane 18 The object of the rim 17 is to limit the air cushion which is built up under the hood In the front part of the hood and in front of the rim 17 is a roller 19.
This roller is freely rotatable on a shaft 20 extending transversely to the direction of operation The roller 19 is of such diameter and is so placed that the lowest part of its periphery lies in the horizontal plane 18.
Thus it has no influence on the normal hovering of the mower The lowest part of the roller periphery may alternatively be situated above the plane 18.
The shaft 20 is supported at its end by two arms 21 extending forwards from the hood.
By using a roller 19 in front of the mower the sliding friction of the grass, which would normally be taken up by the surface 22 of the rim 17, is transmitted to the roller as rolling friction thus reducing the resistance and improving the handling of the mower when being hand-pushed into heavy tall grass It should be pointed out that it is desirable to use a roller which is light and has a radius as large as possible with respect to the radius of the shaft, because this will promote converting of sliding friction into rolling friction.
It is of course possible to use more than c ( 19) 2 1 585 046 2 one roller instead of a single roller in the front part of the mower.
The invention is not limited to the embodiment shown but can be modified within the scope of the following claims.
Claims (6)
WHAT I CLAIM IS:-
1 Lawn mower of the type which in operation is supported on a cushion of air and comprises a knife which is rotated about a vertical axis by a driving unit, and a fan wheel rotating about the same axis, the knife and fan wheel being shrouded by a hood having one or more than one inlet opening for air to the air cushion, wherein the hood in its front part has one or more than one roller.
2 Lawn mower according to Claim 1, wherein the or each roller is freely rotatable on a shaft which extends transversely to the operating direction.
3 Lawn mower according to Claim 2, wherein the hood has a rim extending around the periphery of the hood, the lower part of the rim being situated in a horizontal plane, and the shaft being placed above this plane.
4 Lawn mower according to Claim 3, wherein the lowest part of the periphery of the or each roller is situated above or in the horizontal plane.
Lawn mower according to any of Claims 1 4, wherein the shaft is supported by two arms extending forwards from the hood.
6 Lawn mower according to any preceding claim, wherein the roller or rollers are situated outside the part of the hood limiting the air cushion.
WITHERS & ROGERS, Chartered Patent Agents, 4, Dyer’s Buildings, Holborn, London, EC 1 N 2 JT.
Agents for the Applicant.
Printed for Her Majesty’s Stationery Office.
by Croydon Printing Company Limited Croydon, Surrey 1981.
Published by The Patent Office 25 Southampton Buildings, London WC 2 A l AY, from which copies may be obtained.
1 585 046
GB21042/78A
1978-05-22
1978-05-22
Lawn mower
Expired
GB1585046A
(en)
Priority Applications (8)
Application Number
Priority Date
Filing Date
Title
GB21042/78A
GB1585046A
(en)
1978-05-22
1978-05-22
Lawn mower
SE7904247A
SE7904247L
(en)
1978-05-22
1979-05-15
LAWNMOWER
DE19792920238
DE2920238A1
(en)
1978-05-22
1979-05-18
AIR CUSHION LAWN MOWER
DK209179A
DK209179A
(en)
1978-05-22
1979-05-22
LAWN MOWER
AU47286/79A
AU526745B2
(en)
1978-05-22
1979-05-22
Air cushion lawn mower
FR7913006A
FR2426394A1
(en)
1978-05-22
1979-05-22
AIR CUSHION LAWN MOWER
IT7949119A
IT7949119D0
(en)
1978-05-22
1979-05-22
IMPROVEMENT IN AIR CUSHION LAWN MOWERS
US06/041,533
US4510738A
(en)
1978-05-22
1979-05-22
Air cushion lawn mower
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB21042/78A
GB1585046A
(en)
1978-05-22
1978-05-22
Lawn mower
Publications (1)
Publication Number
Publication Date
GB1585046A
true
GB1585046A
(en)
1981-02-18
Family
ID=10156204
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB21042/78A
Expired
GB1585046A
(en)
1978-05-22
1978-05-22
Lawn mower
Country Status (8)
Country
Link
US
(1)
US4510738A
(en)
AU
(1)
AU526745B2
(en)
DE
(1)
DE2920238A1
(en)
DK
(1)
DK209179A
(en)
FR
(1)
FR2426394A1
(en)
GB
(1)
GB1585046A
(en)
IT
(1)
IT7949119D0
(en)
SE
(1)
SE7904247L
(en)
Families Citing this family (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB8514154D0
(en)
*
1985-06-05
1985-07-10
Flymo Ltd
Lawn mowers
GB9008571D0
(en)
*
1990-04-17
1990-06-13
Electrolux Northern
Lawn mowers
GB9818882D0
(en)
*
1998-08-28
1998-10-21
Bosch Gmbh Robert
Rotary lawnmowers
GB0028216D0
(en)
*
2000-11-18
2001-01-03
Millin Reginald F J
All weather rotary mower
GB2370749A
(en)
*
2001-01-09
2002-07-10
Electrolux Outdoor Prod Ltd
Wheel arrangement for a grass cutting machine
CN1589601A
(en)
*
2003-09-06
2005-03-09
Gmca有限公司
Grass mower
US20110179757A1
(en)
*
2009-12-25
2011-07-28
Scott-Stanbridge N
Lightweight battery-driven air-supported vegetation trimmer
US20210112710A1
(en)
*
2019-10-18
2021-04-22
Bluebird Turf Products LLLP, A Delaware Limited Liability Partnership
Electric Power Hover Lawn Mower
Family Cites Families (12)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3118268A
(en)
*
1964-01-21
Lawn mower and attachment therefor
US456472A
(en)
*
1891-07-21
bratjn
US901449A
(en)
*
1907-09-09
1908-10-20
Nat Rural Route Advertising Company
Metal-reinforced concrete post.
GB224671A
(en)
*
1923-10-03
1924-11-20
Ismay Annie Fownes
Improvements in and relating to wire-netting fencing
US1632231A
(en)
*
1926-10-12
1927-06-14
William M Holtz
Fence
GB321719A
(en)
*
1928-08-18
1929-11-18
Charles George Garrard
Improvements in and relating to lawn mowers
US1939841A
(en)
*
1933-01-14
1933-12-19
Briggs Alfred
Curtain stretcher
US2574725A
(en)
*
1948-07-12
1951-11-13
George D Berdan
Lawn mower having a slidable and tiltable reel
US3338038A
(en)
*
1964-10-01
1967-08-29
Flymo Sa
Lawn mowers
US3423912A
(en)
*
1968-04-17
1969-01-28
Jacobsen Mfg Co
Ground effect lawn mower
US3838558A
(en)
*
1973-03-05
1974-10-01
D Goodchild
Air cushioned lawn mower and grass collector
FR2421247A1
(en)
*
1978-03-31
1979-10-26
Campenon Bernard Cetra
RAILING, ESPECIALLY FOR CONSTRUCTION SITES
1978
1978-05-22
GB
GB21042/78A
patent/GB1585046A/en
not_active
Expired
1979
1979-05-15
SE
SE7904247A
patent/SE7904247L/en
not_active
Application Discontinuation
1979-05-18
DE
DE19792920238
patent/DE2920238A1/en
not_active
Withdrawn
1979-05-22
AU
AU47286/79A
patent/AU526745B2/en
not_active
Expired
1979-05-22
IT
IT7949119A
patent/IT7949119D0/en
unknown
1979-05-22
FR
FR7913006A
patent/FR2426394A1/en
active
Granted
1979-05-22
DK
DK209179A
patent/DK209179A/en
unknown
1979-05-22
US
US06/041,533
patent/US4510738A/en
not_active
Expired – Lifetime
Also Published As
Publication number
Publication date
FR2426394A1
(en)
1979-12-21
AU526745B2
(en)
1983-01-27
DK209179A
(en)
1979-11-23
US4510738A
(en)
1985-04-16
DE2920238A1
(en)
1979-11-29
IT7949119D0
(en)
1979-05-22
AU4728679A
(en)
1979-11-29
SE7904247L
(en)
1979-11-23
FR2426394B1
(en)
1984-04-27
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Legal Events
Date
Code
Title
Description
1981-05-07
PS
Patent sealed [section 19, patents act 1949]
1981-07-15
732
Registration of transactions, instruments or events in the register (sect. 32/1977)
1983-03-30
732
Registration of transactions, instruments or events in the register (sect. 32/1977)
1998-06-10
PE20
Patent expired after termination of 20 years
Effective date:
19980521
