GB2468866A - Coil spring actuated lawn aerator - Google Patents
Coil spring actuated lawn aerator Download PDFInfo
- Publication number
- GB2468866A GB2468866A GB0904984A GB0904984A GB2468866A GB 2468866 A GB2468866 A GB 2468866A GB 0904984 A GB0904984 A GB 0904984A GB 0904984 A GB0904984 A GB 0904984A GB 2468866 A GB2468866 A GB 2468866A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cam
- cams
- stop device
- limiting stop
- cam followers
- 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.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B45/00—Machines for treating meadows or lawns, e.g. for sports grounds
- A01B45/02—Machines for treating meadows or lawns, e.g. for sports grounds for aerating
- A01B45/023—Perforators comprising spiking tools actively driven in a reciprocating movement through a crankshaft or eccentric mechanism
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Soil Working Implements (AREA)
Abstract
A coil spring actuated lawn aerator comprises a plurality of aerating tine mechanisms wherein each mechanism comprises a drive wheel9with integral cams8, an actuating arm6, a cam follower4, a coil spring1, a head unit5having a limiting stop13, attached to the arm6wherein when the cam follower4has reached its lowest point of travel as determined by the limiting stop13, the rotation of the drive wheel9and the action of the coil spring1on the head unit5there exists a gap14between the cam follower4and the cam8prior to the rotational action of the drive wheel9bringing the cam8into contact with the cam follower4.
Description
AN IMPROVEMENT (1) TO COIL SPRING ACTUATED LAWN AERATORS UK Patent Application GB 2 436 511 A reveals a coil spring actuated lawn aerator. Whilst the aerator functions as described in the afore mentioned patent when plunging the tines into the lawn as a function of the coil springs the travel of the cam followers is limited by impacting upon the cams attached to the rotating drive wheels. This said impacting has a detrimental effect upon the drive mechanism since the impact of the cam follower on the rising cam induces a momentary reversal of direction of the drive wheel and thus of the drive mechanism ultimately leading to mechanical failure. This invention embodies an improvement and a resolution to the above mentioned patent application so to eliminate any momentary reversal of direction of the drive wheel and consequent mechanical failure.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: Fig.1 transparent' schematic representation of the invention when the actuating arm 6 is at its highest point relative to the central drive axle 11.
Fig.2 transparent' schematic representation of the invention when the actuating arm 6 is at its lowest point relative to the central drive axle 11 having been limited in its travel by the limiting stop device 13.
Fig.3 transparent' schematic representation of the invention when the actuating arm 6 is at its lowest point relative to the central drive axle 11 having been limited in its travel by the limiting stop device 13 and at a point where cam follower 4 meets cam 8 as a factor of the rotation of drive wheel 9.
For clarity in none of the figures above are the power source or the chassis of the machine carrying manifestations of the invention shown.
Referring to the drawings the improvement to the coil spring actuated lawn aerator as revealed in UK Patent Application GB 2 436 511 comprises a limiting stop device 13 which limiting stop device 13 is preferably combined with and an extension to the nylon moulded head units 5 as in this example and which said limiting stop device 13 restricts the downward movement of the actuating arm 6 and attendant cam followers 4 by impact with the central drive axle 11 as in this example the drive wheel 9 with integral cams 8 have said cams 8 so disposed around said drive whee! 9 as to ensure that when the said cam followers 4 have reached their lowest point of travel as determined by the limiting stop device 13 and the action of the coil springs 1 upon the said nylon moulded head units 5 that there exists a gap 14 between the said cam followers 4 and the said cams 8 prior to the rotational action of the said drive wheel 9 bringing the slope of the said cams 8 into contact with the said cam followers 4.
Claims (1)
- CLAIMS1. An improvement to the coil spring actuating lawn aerator as revealed in UK Patent Application GB 2 436 511 comprises a limiting stop device 13 which limiting stop device 13 is preferably combined with and an extension to the nylon moulded head units 5 as in this example and which said limiting stop device 13 restricts the downward movement of the actuating arm 6 and attendant cam followers 4 by impact with the central drive axle 11 as in this example the drive wheel 9 with integral cams 8 have said cams 8 so disposed around said drive wheel 9 as to ensure that when the said cam followers 4 have immediately reached their lowest point of travel as determined by the limiting stop device 13 and the action of the coil springs 1 upon the said nylon moulded head units 5 that there exists a gap 14 between the said cam followers 4 and the said cams 8 prior to the rotational action of the said drive wheel 9 bringing the slope of the said cams 8 into contact with the said cam followers 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0904984A GB2468866A (en) | 2009-03-24 | 2009-03-24 | Coil spring actuated lawn aerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0904984A GB2468866A (en) | 2009-03-24 | 2009-03-24 | Coil spring actuated lawn aerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0904984D0 GB0904984D0 (en) | 2009-05-06 |
| GB2468866A true GB2468866A (en) | 2010-09-29 |
Family
ID=40640024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0904984A Withdrawn GB2468866A (en) | 2009-03-24 | 2009-03-24 | Coil spring actuated lawn aerator |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2468866A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2302944A (en) * | 1941-09-05 | 1942-11-24 | Helbig Hugo | Lawn perforating machine |
| GB792798A (en) * | 1954-02-26 | 1958-04-02 | Wilfred Ellis | Turf spiker and aerator |
| US3163236A (en) * | 1962-10-30 | 1964-12-29 | John C Ray | Soil spiking machine |
| US4632189A (en) * | 1984-10-04 | 1986-12-30 | Rizzo Salvatore J | Soil aerating machine |
| GB2436511A (en) * | 2006-03-29 | 2007-10-03 | Miles Roland William Bozeat | Coil spring actuated lawn aerator |
-
2009
- 2009-03-24 GB GB0904984A patent/GB2468866A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2302944A (en) * | 1941-09-05 | 1942-11-24 | Helbig Hugo | Lawn perforating machine |
| GB792798A (en) * | 1954-02-26 | 1958-04-02 | Wilfred Ellis | Turf spiker and aerator |
| US3163236A (en) * | 1962-10-30 | 1964-12-29 | John C Ray | Soil spiking machine |
| US4632189A (en) * | 1984-10-04 | 1986-12-30 | Rizzo Salvatore J | Soil aerating machine |
| GB2436511A (en) * | 2006-03-29 | 2007-10-03 | Miles Roland William Bozeat | Coil spring actuated lawn aerator |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0904984D0 (en) | 2009-05-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |