GB2467733A - An arborist tool for use in raising and lowering tree trunks and branches - Google Patents
An arborist tool for use in raising and lowering tree trunks and branches Download PDFInfo
- Publication number
- GB2467733A GB2467733A GB0902165A GB0902165A GB2467733A GB 2467733 A GB2467733 A GB 2467733A GB 0902165 A GB0902165 A GB 0902165A GB 0902165 A GB0902165 A GB 0902165A GB 2467733 A GB2467733 A GB 2467733A
- Authority
- GB
- United Kingdom
- Prior art keywords
- arborist
- tool according
- rope
- anvil
- base plate
- 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- Withdrawn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
- ZPUCINDJVBIVPJ-LJISPDSOSA-N cocaine Chemical compound O([C@H]1C[C@@H]2CC[C@@H](N2C)[C@H]1C(=O)OC)C(=O)C1=CC=CC=C1 ZPUCINDJVBIVPJ-LJISPDSOSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
- B66D5/16—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes for action on ropes or cables
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G23/00—Forestry
- A01G23/02—Transplanting, uprooting, felling or delimbing trees
- A01G23/099—Auxiliary devices, e.g. felling wedges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/28—Other constructional details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
- B66D1/74—Capstans
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
- B66D1/74—Capstans
- B66D1/7405—Capstans having two or more drums providing tractive force
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Environmental Sciences (AREA)
- Supports For Plants (AREA)
Abstract
An arborist tool 10 for raising and lowering tree trunks and branches comprises a base plate 13 which is attached by a strap 16 to the base of a tree and on which at least one capstan 14 is mounted. A rope gripping device 12 in the form of a two-part lever 23, 24 is pivotally mounted on the base plate 13 for movement towards and away therefrom, and is operable in operation to grip a rope 30 passing therethrough when the rope gripping device 12 is moved towards the base plate 13 and to release the rope 30 when the rope gripping device 12 is moved away from the base plate 13. The lever parts 23, 24 are pivotally attached to each other, with an anvil 28 on one part 23 and a clamp means 29 on the other part 24, the rope 30 passing in a convoluted path between the anvil 28 and clamp means 29. Two spaced axially parallel capstans 14, 15 may be mounted on the base plate 13.
Description
S
ARBORIST TOOL
This invention relates to arborist tools, and in particular to tools for use in felling and de-branching trees.
The procedure adopted for felling or de-branching a tree varies considerably with the location of the tree and its size or that of the branch. If the tree or branch will not foul other trees, buildings or other obstructions, the tree may be felled by saw or axe cutting at the tree near to the ground or the branch may be cut from the tree and lowered directly down to the ground.
However, if there are obstructions in the vicinity of the tree, it is customary to fell the tree by "sectional felling", or branch removal may be done by raising the branch and moving it laterally to a position from which it can be lowered to the ground without fouling any obstruction.
Sectional felling involves first lopping the branches from the trunk and then progressively removing section by section the uppermost section of the trunk. Hence this operation may require the branch removal operation referred to above.
The branch lowering operation usually involves attaching one end of a rope to the branch before cutting it from the tree, passing the rope over a pulley secured above the branch to be removed and then passing the other end of the rope around a capstan device secured to the ground or base of the tree. By gradually reducing the tension in the free end of the rope and allowing rotation of the capstan or the rope to slip around the capstan, the branch after cutting can be lowered in a controlled manner. In order to raise the branch, it is customary to use a ratchet capstan, whereby rotation of the capstan over its internal ratchet pulls downwardly on the rope issuing therefrom and hence upwardly on the length of rope between the pulley and the branch. Such devices are relatively costly to manufacture, but raising and lowering tree trunks and branches without such devices is dangerous for the personnel involved. It is an object of the present invention to provide a less costly alternative device, but which is equally simple in operation and safe to use as the known devices.
The invention provides an arborist tool comprising a base unit having at least one capstan mounted thereon, a rope gripping device mounted on the base unit for movement towards and away therefrom, wherein the rope gripping device is operable in operation to grip a rope passing therethrough when the rope gripping device is moved towards the base unit and to release said rope when the rope gripping device is moved away from the base unit.
The rope gripping device may comprise an elongate lever, which may be pivotally mounted on the base unit. The lever may comprise an anvil part and a gripping part, and the gripping part may be attached to the anvil part for relative movement therebetween. The anvil part may have a proximal end thereof pivotally attached to the base unit, and may have an anvil secured thereto at a distal end thereof. The gripping part may pivotally attached to the anvil part, and may have a proximal end thereof attached at the distal end of the anvil part. The gripping part may have clamp means secured thereto at the proximal end thereof.
The anvil and the clamp means may comprise a plurality of cylindrical members, which may interleave when the clamp means is moved into a rope gripping position relative to the anvil.
Adjustment means may be provided whereby the minimum distance between the anvil and clamp means may be adjusted for differing thicknesses of rope. The adjustment means may comprise a screw mounted on one of the anvil part and the gripping part and a stop on the other of the anvil part and the gripping part and disposed to be engaged by the screw when the clamp means is moved towards the anvil. A rope retaining means may be attached to one of said anvil or clamp means. A hand guard plate may be secured to the anvil part at the distal end thereof. The rope gripping device may be removably attached to the base unit.
The base unit may comprise a base plate on which the at least one capstan is mounted. The base plate may have two capstans mounted thereon, in which case the capstans may be in a substantially axially parallel, spaced disposition. The rope gripping device may be pivotally mounted on the base plate at a position remote from the capstan or capstans. The base plate may have tree engaging means attached thereto, and the engaging means may be in the form of a band passing in use around the standing trunk of a tree. The base plate may have loops attached thereto through which the band may pass. The base plate may also have at least one additional loop through which an additional or "choker" strap may pass. The base plate may have protrusions on the side thereof that in use lies against a tree, and the protrusions may comprise ribs.
The invention will now be further described with reference to the accompanying drawings in which: Fig. I is a front elevation of an arborist tool in accordance with the invention, Fig 2 is a plan view of the tool of Fig. 1 with the rope gripping means detached from the base unit, Fig. 3 is an enlarged front view of the rope gripping means in an open position, and Fig. 4 is an enlarged front view of the rope gripping means in a rope gripping position.
Referring now to Figs. 1 and 2, there is shown an arborist tool 10 comprising a base unit 11 and a rope gripping means 12. The base unit 10 comprises a base plate 13 on which two capstans 14, 15 are mounted in a substantially axially parallel, spaced disposition. The base unit 11 may be attached to a tree (not shown) by means of a strap 16 which passes through two loops 17 provided on the base plate 13. The strap 16 is tightened around the base of the tree in conventional manner. To strengthen the base plate 13 and to prevent the strap 16 from chafing between the tree and the base plate 13, ribs 18 are provided on the rear face of the base plate 13. The ribs 18 also "bite" into the tree to stabilise the tool 10 on the tree. As a safety precaution, a further loop 19 is provided on the base plate 13, through which an additional or "choker" strap (not shown) may pass in case the main strap 16 fails to secure the tool 10 to the tree. To facilitate the threading of the choker strap through the loop 19, the loop 19 lies out of the plane of the base plate 13. Attached to the base plate 13 is an upstanding post 20 which is braced by a bracing strut 21. At the upper end of the post 20 is a pivot pin 22.
Referring now to Figs. 1 to 4, the rope gripping device 12 is in the form of an elongate lever having an anvil part 23 and a gripping part 24. Attached to a proximal end of the anvil part 23 is a pivot bush 25, into the bore 26 of which the pivot pin 22 is received (as shown by the dashed arrow in Fig. 2) when the rope gripping device 12 is pivotally mounted on the base unit 11. A proximal end of the gripping part 24 is attached to the distal end of the anvil part 23 by means of pivot 27. At the distal end of the anvil part 23 is an anvil 28, and at the proximal end of the gripping part 24 is a clamp means 29. When the gripping part 24 is raised (i.e. away from the base unit 11) as shown in Fig. 3, the clamp means 29 is spaced from the anvil 28 whereby a rope 30 (Figs. 1 and 4) can pass freely therebetween. When the gripping part 24 is moved downwardly (i.e. towards the base unit 11) as shown by the arrow in Fig. 3 to the position shown in Figs. 1 and 4, the rope 30 is engaged between the clamp means 29 and the anvil 28. Both the clamp means 29 and the anvil 28 comprise three cylindrical members which interleave when in this rope engaging position. This configuration of clamp means 29 and anvil 28 provides that the rope 30 traverses a convoluted path between them (see Fig. 4), so that gripping of the rope 30 relies on friction as well as the clamping effect. To safeguard against a person trapping their fingers between the clamp means 29 and the anvil 30, a hand guard plate 31 is attached to the distal end of the anvil part 23. In addition, to prevent the rope 30 from slipping from between the clamp means 29 and the anvil 28 as they move together or apart, a rope retaining means 32 is attached to the anvil 28. In order that the clamp means 29 and anvil 28 grip adequately, but do not damage, differing thicknesses of rope 30, an adjustment screw 33 is provided on the gripping part 24 to engage with a stop 34 provided on the anvil part 23.
Operation of the arborist tool 10 in raising and lowering a heavy tree branch is as follows. The arborist tool 10 is secured to the base of a tree by means of the main strap 16 in conventional manner. For safety reasons a choker strap may also be used. A rope 30 is secured to the branch to be removed and passed through a pulley that is secured to the tree above the location of the branch concerned. The rope 30 then passes through the open clamp means 29 and anvil 28, the rope gripping device 12 being in a raised position, to pass around the capstan 14 one or more times as required dependent on the estimated weight of the branch. The tension in the rope 30 is sufficient to prevent substantial lowering of the branch when it is cut from the tree. After cutting, the rope gripping device 12 is lowered towards the base unit Ii, thereby causing the rope 30 to be gripped between the clamp means 29 and the anvil 28.
Further lowering of the rope gripping device 12 pulls the rope 30 downwardly, thereby raising the branch. The slack rope 30 below the rope gripping means 12 is pulled around the capstan 14, and friction prevents the rope 30 from slipping back. The rope gripping device 12 is then raised, releasing the rope 30 from between the clamp means 29 and the anvil 28, and the process is repeated as many times as necessary to lift the branch clear of any obstacle.
Tension in the rope 30 around the capstan 14 may then be reduced to allow lowering of the branch to the ground. For purely lowering purposes, the rope gripping device 12 may be removed from the base unit 11. For particularly heavy branches, the rope 30 may be passed around both capstans 14, 15, or two ropes may be employed, one passing around capstan 14 and a second rope passing around capstan 15. Alternatively, the second rope may be attached to a second branch whereby two branches may be removed without having to reset the positions of the tool 10 or pulley at the upper part of the tree.
Other embodiments of arborist tool in accordance with the invention will be readily apparent to persons skilled in the art. For example,the anvil and gripping means may comprise serrated blocks. The tree engaging means may comprise tree gripper devices adapted to engage the standing tree trunk at opposed sides thereof. The gripping part 24 may be slidable longitudinally of the anvil part 23 instead of being pivotally mounted thereon, or the rope gripping means 12 may comprise a single lever on which the clamp means 29 or anvil 28 are movable to grip or release the rope 30.
Claims (28)
- CLAIMS1. An arborist tool comprising a base unit having at least one capstan mounted thereon, a rope gripping device mounted on the base unit for movement towards and away therefrom, wherein the rope gripping device is operable in operation to grip a rope passing therethrough when the rope gripping device is moved towards the base unit and to release said rope when the rope gripping device is moved away from the base unit.
- 2. An arborist tool according to claim 1, wherein the rope gripping device comprises an elongate lever.
- 3. An arborist tool according to claim 2, wherein the lever is pivotally mounted on the base unit.
- 4. An arborist tool according to claim 3, wherein the lever comprises an anvil part and a gripping part.
- 5. An arborist tool according to claim 4, wherein the gripping part is attached to the anvil part for relative movement therebetween.
- 6. An arborist tool according to claim 4 or claim 5, wherein the anvil part has a proximal end pivotally attached to the base unit.
- 7. An arborist tool according to claim 6, wherein the anvil part has an anvil secured thereto at a distal end thereof.
- 8. An arborist tool according to any one of claims 5 to 7, wherein the gripping part is pivotally attached to the anvil part.S
- 9. An arborist toot according to claim 8, wherein the gripping part has a proximal end attached at the distal end of the anvil part.
- 10. An arborist tool according to claim 9, wherein the gripping part has clamp means secured thereto at the proximal end thereof.
- 11. An arborist tool according to claim 10, wherein the anvil and the clamp means comprise a plurality of cylindrical members.
- 12. An arborist tool according to claim 11, wherein the cylindrical members interleave when the clamp means is moved into a rope gripping position relative to the anvil.
- 13. An arborist tool according to any one of claims 10 to 12, wherein adjustment means is provided whereby the minimum distance between the anvil and clamp means may be adjusted for differing thicknesses of rope.
- 14. An arborist tool according to claim 13, wherein the adjustment means comprises a screw mounted on one of the anvil part and the gripping part and a stop on the other of the anvil part and the gripping part and disposed to be engaged by the screw when the clamp means is moved towards the anvil.
- 15. An arborist tool according to any one of claims 10 to 14, wherein a rope retaining means is attached to one of said anvil or clamp means.
- 16. An arborist tool according to any one of claims 10 to 15, wherein a hand guard plate is secured to the anvil part at the distal end thereof.
- 17. An arborist tool according to any one of claims 1 to 16, wherein the rope gripping device is removably attached to the base unit.
- 18. An arborist tool according to any one of claims ito 17, wherein the base unit comprises a base plate on which the at least one capstan is mounted.
- 19. An arborist tool according to claim 18, wherein the base plate has two capstans mounted thereon.
- 20. An arborist tool according to claim 19, wherein the capstans are in a substantially axially parallel, spaced disposition.
- 21. An arborist tool according to claim 19 or claim 20, wherein the rope gripping device is pivotally mounted on the base plate at a position remote from the capstan or capstans.
- 22. An arborist tool according to any one of claims 18 to 21, wherein the base plate has tree engaging means attached thereto.
- 23. An arborist tool according to claim 22, wherein the engaging means is in the form of a band passing in use around the standing trunk of a tree.
- 24. An arborist tool according to claim 23, wherein the base plate has loops attached thereto through which the band may pass.
- 25. An arborist tool according to claim 24, wherein the base plate has at least one additional loop through which an additional or "choker" strap may pass.
- 26. An arborist tool according to any one of claims 18 to 25, wherein the base plate has protrusions on the side thereof that in use lies against a tree.
- 27. An arborist tool according to claim 26, wherein the protrusions comprise ribs.
- 28. An arborist tool substantially as hereinbefore described with reference to and as illustrated in Figs. I to 4 of the accompanying drawings.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0902165A GB2467733A (en) | 2009-02-10 | 2009-02-10 | An arborist tool for use in raising and lowering tree trunks and branches |
PCT/GB2010/000055 WO2010092319A1 (en) | 2009-02-10 | 2010-01-14 | Arborist tool |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0902165A GB2467733A (en) | 2009-02-10 | 2009-02-10 | An arborist tool for use in raising and lowering tree trunks and branches |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0902165D0 GB0902165D0 (en) | 2009-03-25 |
GB2467733A true GB2467733A (en) | 2010-08-18 |
Family
ID=40527117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0902165A Withdrawn GB2467733A (en) | 2009-02-10 | 2009-02-10 | An arborist tool for use in raising and lowering tree trunks and branches |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2467733A (en) |
WO (1) | WO2010092319A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201800007480A1 (en) | 2018-07-24 | 2020-01-24 | Tommaso Zulato | INTRINSICALLY SAFE DYNAMIC BRAKING DEVICE |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB735430A (en) * | 1952-03-26 | 1955-08-24 | Ewen Anthony Guy Cameron Bruce | Improvements in or relating to winches |
US3770244A (en) * | 1972-01-18 | 1973-11-06 | Cloud R Mc | Winch mechanism |
US3841606A (en) * | 1973-10-26 | 1974-10-15 | M Declercq | Self-tailing winch |
US4314693A (en) * | 1980-06-13 | 1982-02-09 | Hobbs Edwin L | Device for arborist contractors |
US5484253A (en) * | 1994-11-07 | 1996-01-16 | Johnson; Kent H. | Conformed frame apparatus for handling loads involved in arbor rigging procedures |
US5971363A (en) * | 1998-11-04 | 1999-10-26 | Good; Gregory P. | Tree winch mounting system |
US20030071252A1 (en) * | 2001-10-11 | 2003-04-17 | Halas D. Carl | Arborist limb lowering device and method |
FR2846935A1 (en) * | 2002-11-13 | 2004-05-14 | Wichard | Rope guiding and blocking device e.g. for use on sailing ship includes locking mechanism movable between locked position and withdrawn position where pulley is free to rotate, with pulley having hexagonal groove |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62140092U (en) * | 1986-02-26 | 1987-09-03 | ||
WO2006074250A2 (en) * | 2005-01-06 | 2006-07-13 | Quoin International, Inc. | Powered personnel ascender |
-
2009
- 2009-02-10 GB GB0902165A patent/GB2467733A/en not_active Withdrawn
-
2010
- 2010-01-14 WO PCT/GB2010/000055 patent/WO2010092319A1/en active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB735430A (en) * | 1952-03-26 | 1955-08-24 | Ewen Anthony Guy Cameron Bruce | Improvements in or relating to winches |
US3770244A (en) * | 1972-01-18 | 1973-11-06 | Cloud R Mc | Winch mechanism |
US3841606A (en) * | 1973-10-26 | 1974-10-15 | M Declercq | Self-tailing winch |
US4314693A (en) * | 1980-06-13 | 1982-02-09 | Hobbs Edwin L | Device for arborist contractors |
US5484253A (en) * | 1994-11-07 | 1996-01-16 | Johnson; Kent H. | Conformed frame apparatus for handling loads involved in arbor rigging procedures |
US5971363A (en) * | 1998-11-04 | 1999-10-26 | Good; Gregory P. | Tree winch mounting system |
US20030071252A1 (en) * | 2001-10-11 | 2003-04-17 | Halas D. Carl | Arborist limb lowering device and method |
FR2846935A1 (en) * | 2002-11-13 | 2004-05-14 | Wichard | Rope guiding and blocking device e.g. for use on sailing ship includes locking mechanism movable between locked position and withdrawn position where pulley is free to rotate, with pulley having hexagonal groove |
Also Published As
Publication number | Publication date |
---|---|
WO2010092319A1 (en) | 2010-08-19 |
GB0902165D0 (en) | 2009-03-25 |
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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) |