GB2040221A - A pruning saw for trimming standing trees - Google Patents
A pruning saw for trimming standing trees Download PDFInfo
- Publication number
- GB2040221A GB2040221A GB8002378A GB8002378A GB2040221A GB 2040221 A GB2040221 A GB 2040221A GB 8002378 A GB8002378 A GB 8002378A GB 8002378 A GB8002378 A GB 8002378A GB 2040221 A GB2040221 A GB 2040221A
- Authority
- GB
- United Kingdom
- Prior art keywords
- saw
- handle
- feed means
- branch
- saw blade
- 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.)
- Granted
Links
- 238000013138 pruning Methods 0.000 title claims description 24
- 238000009966 trimming Methods 0.000 title claims description 7
- 239000002184 metal Substances 0.000 claims description 2
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
- B27B21/00—Hand saws without power drive; Equipment for hand sawing, e.g. saw horses
- B27B21/04—Cross-cut saws; Pad saws
-
- 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
- A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
- A01G3/08—Other tools for pruning, branching or delimbing standing trees
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Scissors And Nippers (AREA)
Abstract
A handle has a first member (1) and a second, telescopic extension member (3). A saw blade (2) is affixed to the top of the member (1) and provided with saw teeth. A feed device (5) is connected by a pivot (6) to the top of the telescopic extension member (3) in the opposite side of the saw blade to where the saw teeth are provided. The feed means has a hook-shaped part (7) terminating at a location on the same side of the saw blade (2) as the saw teeth. In use, a branch (13) to be sawn is engaged by the hook-shaped part (7) at a location above the pivot (6) and the branch (13) is urged into contact with the saw teeth by the exertion of a downward force on the handle. The downward force determines the cutting force exerted on the branch (13). <IMAGE>
Description
SPECIFICATION
Pruning saw
The present invention relates to a pruning saw for trimming standing trees, the saw comprising a saw blade, a handle with a telescopic extension and a feed means.
Pruning saws with feed means known in the art are positively fed, that is, the feed is linked with the length of the sawing or pulling motion. Such saws have the drawback that the force requirements increase in proportion to the thickness and/or hardness of the branch, ultimately becoming insurmountable.
An object of the present invention is to provide a pruning saw of which the feed is automatically controlled in accordance with the object that is being sawed, so that under all circumstances the force requirements of the pulling sawing motion will be reasonable.
According to the invention there is provided a pruning saw for trimming standing trees, comprising a handle having a first member and a second, telescopic extension member; a saw blade affixed to the top of the said first member and provided with saw teeth; and a feed means pivotally connected to the top of the telescopic extension member in the opposite side of the saw blade to where the saw teeth are provided, the feed means further comprising a hook-shaped part terminating art a location on the same side of the saw blade as the saw teeth; whereby, in use, a branch is to be sawn is engaged by the hook-shaped part at a location above the said pivotal connection and the branch is urged into contact with the saw teeth by the exertion of a downward force on the handle, which downward force determines the cutting force exerted on the branch.
It has been found in experiments that have been carried out, that pruning performed with the saw according to the invention is less exerting physically, faster, and more accurate than with known pruning saws.
The sawing phase proper starts when the handle is pulled downwardly. If the branch is not cut off with the first stroke, the saw with handle is automatically pushed back up, if the telescopic extension is fitted with a return spring.
Owing to the design of the feed means, the force required for the pulling sawing motion is always reasonable and substantially independent of the thickness our a degree of hardness of the branch.
Using the saw according to the invention there is no risk of damage being inflicted on the trunk because the feed means keeps the blade accurately at the work object. The risk of a falling branch tearing the bark of the tree is likewise non-existent because the severing pull takes place rapidly.
In the accompanying drawings, which show one embodiment of the invention;
Figure 1 shows the saw in the base position and
Figures 2 and 3, in the operating position. The saw is shown in side elevation in Figures 1 and 2, and in front elevation in Figure 3.
The saw comprises a handle 1 which consists of a square cross-section tube carrying on its upper part a straight saw blade 2. The saw blade is affixed to the outer surface of the tube parallel thereto. The handle tube 1 has a telescopic extension 3 consists of another square cross-section tube fitted to slide in the handle tube 1. At its top end the extension 3 has a backwardly pointing lug 4, to which a feed means 5 is pivotally attached by a pivot pin 6. The feed means extends past the side of the saw blade 2 without being in frictional contact therewith and terminates at a location forward of the saw blade. The front portion of the feed means is in the form of a hook-shaped part 7. In the embodiment shown, the feed means is of sheet metal, which forms a supporting sleeve running around the back of the saw, the supporting sleeve being a slide fit on either side of the saw back.A stop 8 controls the backward pivoting motion of the feed means. The travel of the telescopic extension is limited by the back of the feed means hitting a transverse pin 9 on the saw blade. The telescopic extension is connected to the handle tube by means of an enclosed helical spring 10 attached at its upper end to the telescopic extension by a pin 11 and at its lower end to the handle tube buy a pin 12.
The saw operates as follows. The hook 7 of the feed means is lifted to rest upon a branch 13, and is so positioned that the side with the saw blade faces against the trunk. When the handle 1 is pulled downwardly (Figures 2 and 3) the handle lengthens, as a result of the telescopic extension, and the feed means 5 is forced backwards as a result of the location of its pivot 6. If the branch is not cut off before the back of the feed means hits against the transverse pin 4 on the saw blade, the helical spring 10 will return the handle with saw blade to its base position, and the saw is ready for the next stroke.
The use of an extension handle enables pruning to be readily carried out even at a great height.
1. A pruning saw for trimming standing trees, comprising a handle having a first member and a second telescopic extension member; a saw blade affixed to the top of the said first member and provided with saw teeth, and a feed means pivotally connected to the top of the telescopic extension member on the opposite side of the saw blade to where the saw teeth are provided, the feed means further comprising a hook-shaped part terminating at a location on the same side of the saw blade as the saw teeth; whereby, in use a branch to be sawn is engaged by the hook-shaped part at a location above the said pivotal connection and the branch is urged into contact with the saw teeth by the exertion of a downward force on the handle, which downward force determines the cutting force exerted on the branch.
2. A pruning saw according to claim 1, wherein the first and second handle means are connected together by means of a return spring.
3. A pruning saw according to claim 1 or 2, wherein the feed means at the same time constitutes
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
1. A pruning saw for trimming standing trees, comprising a handle having a first member and a second telescopic extension member; a saw blade affixed to the top of the said first member and provided with saw teeth, and a feed means pivotally connected to the top of the telescopic extension member on the opposite side of the saw blade to where the saw teeth are provided, the feed means further comprising a hook-shaped part terminating at a location on the same side of the saw blade as the saw teeth; whereby, in use a branch to be sawn is engaged by the hook-shaped part at a location above the said pivotal connection and the branch is urged into contact with the saw teeth by the exertion of a downward force on the handle, which downward force determines the cutting force exerted on the branch.
2. A pruning saw according to claim 1, wherein the first and second handle means are connected together by means of a return spring.
3. A pruning saw according to claim 1 or 2, wherein the feed means at the same time constitutes a sleeve which runs behind the back of the saw blade and supports the saw blade on both sides thereof with a slide fit.
4. A pruning saw substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI790221 | 1979-01-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2040221A true GB2040221A (en) | 1980-08-28 |
GB2040221B GB2040221B (en) | 1982-10-06 |
Family
ID=8512320
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8002378A Expired GB2040221B (en) | 1979-01-24 | 1980-01-24 | Pruning saw for trimming standing trees |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS55108219A (en) |
BR (1) | BR8000424A (en) |
DE (1) | DE3002379A1 (en) |
FR (1) | FR2447139A1 (en) |
GB (1) | GB2040221B (en) |
IN (1) | IN152120B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0211182A2 (en) * | 1985-07-31 | 1987-02-25 | Walter Steiner | Pruning saw |
AU671789B2 (en) * | 1994-08-15 | 1996-09-05 | Stephen John Field | Pruning apparatus |
WO1997042806A1 (en) * | 1996-05-09 | 1997-11-20 | CURTIS, Susanne, Jean | Pruning saw |
CN106718178A (en) * | 2017-03-14 | 2017-05-31 | 恭城瑶族自治县恭城中学 | Persimmon tree Top-pruning device |
CN113243278A (en) * | 2021-05-28 | 2021-08-13 | 海南天然橡胶产业集团股份有限公司 | Tapping knife for tapping machine |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5767564U (en) * | 1980-10-11 | 1982-04-22 | ||
FR2589317B1 (en) * | 1985-11-05 | 1988-10-14 | Pelissier Camil | MANUAL PRUNING SAW FOR FLEXIBLE BRANCHES |
JPS6310860U (en) * | 1986-07-10 | 1988-01-25 | ||
CN102282957A (en) * | 2011-06-20 | 2011-12-21 | 马灵玉 | Tool for breaking off Chinese toon buds |
CN106489559B (en) * | 2016-11-01 | 2019-04-09 | 郝桂盛 | Branches of tall trees saw saving labour for the finishing of trees branch |
CN112106548B (en) * | 2020-09-16 | 2022-12-30 | 福建龙田生态建设集团有限公司 | Plant trimming manipulator |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR790390A (en) * | 1934-08-18 | 1935-11-20 | Pruning device | |
US2399393A (en) * | 1944-08-09 | 1946-04-30 | Byron J Schillinger | Tree pruning saw |
US3158933A (en) * | 1960-04-04 | 1964-12-01 | Mcculloch Corp | Tree pruning device |
DE1943044A1 (en) * | 1969-08-23 | 1971-03-04 | Sterzig Klaus Dr Dipl Forsting | Hand pruning saw for removing dry and green branches on living trees |
-
1980
- 1980-01-22 FR FR8001348A patent/FR2447139A1/en active Granted
- 1980-01-23 DE DE19803002379 patent/DE3002379A1/en not_active Withdrawn
- 1980-01-23 BR BR8000424A patent/BR8000424A/en unknown
- 1980-01-24 GB GB8002378A patent/GB2040221B/en not_active Expired
- 1980-01-24 IN IN87/CAL/80A patent/IN152120B/en unknown
- 1980-01-24 JP JP767180A patent/JPS55108219A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0211182A2 (en) * | 1985-07-31 | 1987-02-25 | Walter Steiner | Pruning saw |
EP0211182A3 (en) * | 1985-07-31 | 1987-06-16 | Walter Steiner | Pruning saw |
AU671789B2 (en) * | 1994-08-15 | 1996-09-05 | Stephen John Field | Pruning apparatus |
WO1997042806A1 (en) * | 1996-05-09 | 1997-11-20 | CURTIS, Susanne, Jean | Pruning saw |
CN106718178A (en) * | 2017-03-14 | 2017-05-31 | 恭城瑶族自治县恭城中学 | Persimmon tree Top-pruning device |
CN113243278A (en) * | 2021-05-28 | 2021-08-13 | 海南天然橡胶产业集团股份有限公司 | Tapping knife for tapping machine |
Also Published As
Publication number | Publication date |
---|---|
BR8000424A (en) | 1980-09-30 |
JPS55108219A (en) | 1980-08-20 |
IN152120B (en) | 1983-10-22 |
FR2447139B1 (en) | 1984-06-29 |
DE3002379A1 (en) | 1980-08-07 |
FR2447139A1 (en) | 1980-08-22 |
GB2040221B (en) | 1982-10-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |