CA1048995A - Tree felling wedge - Google Patents
Tree felling wedgeInfo
- Publication number
- CA1048995A CA1048995A CA73188749A CA188749A CA1048995A CA 1048995 A CA1048995 A CA 1048995A CA 73188749 A CA73188749 A CA 73188749A CA 188749 A CA188749 A CA 188749A CA 1048995 A CA1048995 A CA 1048995A
- Authority
- CA
- Canada
- Prior art keywords
- wedge
- tree
- pair
- wedge piece
- jaws
- 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
Links
- 229910000639 Spring steel Inorganic materials 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/08—Accessories for keeping open the saw kerf, e.g. riving knives or wedge plates
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Clamps And Clips (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The following specification discloses a tree felling wedge intended to be fitted into the saw cut when a tree is being felled and has two jaws approaching each other in wedge fashion with a wedge piece between each jaw, means for pushing the wedge piece between the jaws is provided and the jaws consist of spring steel plates attached to the body of the felling wedge and the wedge piece consists of plastic.
The following specification discloses a tree felling wedge intended to be fitted into the saw cut when a tree is being felled and has two jaws approaching each other in wedge fashion with a wedge piece between each jaw, means for pushing the wedge piece between the jaws is provided and the jaws consist of spring steel plates attached to the body of the felling wedge and the wedge piece consists of plastic.
Description
~48995 Tree Felling Wedge The present invention concerns a tree-felling wedge intended to be inserted into the saw cut when a tree is being felled, and which comprises two wedge-shaped jaws approaching each other and between these a wedge piece, as well as means for pushing the wedge piece between the jaws.
In tree-felling wedges of the type described the jaws are massive and have been attached to the machine body to be turn-able like hinges. This arrangement has the drawback, in ad-dition to that of a heavy constructioni that when the jaws are opened the point of contact between the jaws and the wedge shifts to the base of the wedge far from the tips of the jaws, resulting in an unfavourable state of load. Furthermore, the massive construction of the hinge-like turnable jaws has caused the drawback that it has not been possible to make the tip part of the-jaws flat enough to accommodate it in the saw cut after a motor saw; it has instead been necessary to widen the cut by chipping. It is a further drawback of the tree-felling wedge of prior art of the type described that the insertion of the wedge piece has been arranged to take place with the aid of a push screw, whereby on one hand it has been a slow operation to return the wedge to its initial position and on the other hand it is necessary between the wedge operation and the sawing to change the position, because the turning handle of the push screw comes to lie, in one extreme position, on the side of the tree opposite to that of the motor saw handle.
The aim of the invention is to provide an improved tree felling wedge, wherein the drawbacks mentioned have been eliminated.
This aim is achieved in a tree felling wedge having substantially the characteristics specified in the attached claims.
In the following the invention is more closely described, with reference to the attached drawings! wherein Figure 1 shows a tree felling wedge according to the invention in elevational view, Fi~ure 2 shows the same, viewed from above and partly exposed
In tree-felling wedges of the type described the jaws are massive and have been attached to the machine body to be turn-able like hinges. This arrangement has the drawback, in ad-dition to that of a heavy constructioni that when the jaws are opened the point of contact between the jaws and the wedge shifts to the base of the wedge far from the tips of the jaws, resulting in an unfavourable state of load. Furthermore, the massive construction of the hinge-like turnable jaws has caused the drawback that it has not been possible to make the tip part of the-jaws flat enough to accommodate it in the saw cut after a motor saw; it has instead been necessary to widen the cut by chipping. It is a further drawback of the tree-felling wedge of prior art of the type described that the insertion of the wedge piece has been arranged to take place with the aid of a push screw, whereby on one hand it has been a slow operation to return the wedge to its initial position and on the other hand it is necessary between the wedge operation and the sawing to change the position, because the turning handle of the push screw comes to lie, in one extreme position, on the side of the tree opposite to that of the motor saw handle.
The aim of the invention is to provide an improved tree felling wedge, wherein the drawbacks mentioned have been eliminated.
This aim is achieved in a tree felling wedge having substantially the characteristics specified in the attached claims.
In the following the invention is more closely described, with reference to the attached drawings! wherein Figure 1 shows a tree felling wedge according to the invention in elevational view, Fi~ure 2 shows the same, viewed from above and partly exposed
-2- 1~8~95 by cutting, and Figure 3 shows the section along line III-III in Figure 2.
The felling wedge comprises jaws 1 approaching each other in wedge-like fashion, which have been affixed by screws 2 to the U-shaped body element 3 of the felling wedge. The jaws 1 con-sist of spring steel sheet, whereby their attachment to the body 3 may be rigid. Between the jaws there is a wedge piece 4, which consists of plastic. Hereby the felling wedge will have a light weight and the friction between the jaws 1 will be low.
The wedge piece of plastic also causes no damage to the blade chain of the motor saw in the event that the wedge piece 4 should inadvertently come into contact with it.
To the wedge piece 4 a tooth rack 5 has been attached, which extends into a tube 6 affixed to the body 3. One end of the tube 6 has been shaped to serve as the handle 7 of the felling wedge. The tube 6 has been attached to the U-shaped body piece 3. Within the body piece 3 a lever arm 8 has been pivotally carried with the aid of a pin 9. Within the U-shaped end of the lever arm a locking pawl 11 has been carried with a pivot pin 10, and which pawl cooperates with the teeth of the rack 5. The length of the lever arm 8 is, for instance, 15 - 20 times the distance of the shafts 9 and 10. The lever arm 8 has a length such that it extends close to the handle of the motor saw in the saw cut. It is then possible without changing the working position alternatingly to saw and to wedge.
In order that the wedge piece might not slip back into its initial position, a retaining means 12 shaped of flat steel section has been pivoted between the lever arm 8 and the body piece 3 on the shaft 9 of the lever arm. When the lever arm 8 is in the working position ~, the pawl of the retaining means 12 enters, urged by the spring 13, a space between the teeth of the rack 5. The returning of the wedge piece into its original position is accomplished by turning the lever arm 8 into the transport position B, whereby the lever arm simultan-eously lifts the pawl of the retaining means 19 out of the teeth of the rack. The wedge piece 4 may then be returned by pushing against the pin 14 attached to the wedge piece.
In the tip portion of the jaws 1 there are edges 15 bent at right angles against the plane of the jaws, and with the aid of which the felling wedge firmly bites into the wood so that 1~4~3995 the turning of the lever arm 8 causes no turning motions of the wedge in the saw cut.
In spite of this the tree felling wedge according to the in-vention fits into the saw cut without any necessity of widening the saw cut, whereas in the models manufactured at present the part entering the saw cut is so thick that widening of the saw cut is a mandatory operation when modern, narrow saw blade chains are used. This advantage is expressly achieved owing to the circumstances that the jaws consist of spring sheet steel and have in their tip portion been bent to constitute opposed surfaces resting against each other. When the wedge piece 4 is pushed in between the tips of the jaws 1, the tips straighten out somewhat to be nearly as the sides of the wedge piece 4. But this causes no retreat of the felling wedge from the saw cut, because this is efficiently prevented by the bent edges 15.
It is furthermore important that the wedge angle between the jaws 1 is smaller than the wedge angle of the wedge piece 4, whereby the load acting between the jaws 1 and the wedge piece 4 remains in the tip portion of the wedge. This also reduces the friction between the jaws and the wedge piece.
The felling wedge comprises jaws 1 approaching each other in wedge-like fashion, which have been affixed by screws 2 to the U-shaped body element 3 of the felling wedge. The jaws 1 con-sist of spring steel sheet, whereby their attachment to the body 3 may be rigid. Between the jaws there is a wedge piece 4, which consists of plastic. Hereby the felling wedge will have a light weight and the friction between the jaws 1 will be low.
The wedge piece of plastic also causes no damage to the blade chain of the motor saw in the event that the wedge piece 4 should inadvertently come into contact with it.
To the wedge piece 4 a tooth rack 5 has been attached, which extends into a tube 6 affixed to the body 3. One end of the tube 6 has been shaped to serve as the handle 7 of the felling wedge. The tube 6 has been attached to the U-shaped body piece 3. Within the body piece 3 a lever arm 8 has been pivotally carried with the aid of a pin 9. Within the U-shaped end of the lever arm a locking pawl 11 has been carried with a pivot pin 10, and which pawl cooperates with the teeth of the rack 5. The length of the lever arm 8 is, for instance, 15 - 20 times the distance of the shafts 9 and 10. The lever arm 8 has a length such that it extends close to the handle of the motor saw in the saw cut. It is then possible without changing the working position alternatingly to saw and to wedge.
In order that the wedge piece might not slip back into its initial position, a retaining means 12 shaped of flat steel section has been pivoted between the lever arm 8 and the body piece 3 on the shaft 9 of the lever arm. When the lever arm 8 is in the working position ~, the pawl of the retaining means 12 enters, urged by the spring 13, a space between the teeth of the rack 5. The returning of the wedge piece into its original position is accomplished by turning the lever arm 8 into the transport position B, whereby the lever arm simultan-eously lifts the pawl of the retaining means 19 out of the teeth of the rack. The wedge piece 4 may then be returned by pushing against the pin 14 attached to the wedge piece.
In the tip portion of the jaws 1 there are edges 15 bent at right angles against the plane of the jaws, and with the aid of which the felling wedge firmly bites into the wood so that 1~4~3995 the turning of the lever arm 8 causes no turning motions of the wedge in the saw cut.
In spite of this the tree felling wedge according to the in-vention fits into the saw cut without any necessity of widening the saw cut, whereas in the models manufactured at present the part entering the saw cut is so thick that widening of the saw cut is a mandatory operation when modern, narrow saw blade chains are used. This advantage is expressly achieved owing to the circumstances that the jaws consist of spring sheet steel and have in their tip portion been bent to constitute opposed surfaces resting against each other. When the wedge piece 4 is pushed in between the tips of the jaws 1, the tips straighten out somewhat to be nearly as the sides of the wedge piece 4. But this causes no retreat of the felling wedge from the saw cut, because this is efficiently prevented by the bent edges 15.
It is furthermore important that the wedge angle between the jaws 1 is smaller than the wedge angle of the wedge piece 4, whereby the load acting between the jaws 1 and the wedge piece 4 remains in the tip portion of the wedge. This also reduces the friction between the jaws and the wedge piece.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A tree felling wedge device for interfitting into a saw cut in a tree being felled by a chain saw operator and for alternately advancing into said saw cut as said operator advances a chain saw into said saw cut made in said tree, comprising in combination; a wedge piece;
a pair of spring steel plates spaced apart from one another and each attached to a rigid member;
each of said pair of plates having a main body portion extending outwardly from said rigid member and in the same direction as each other, each of said pair of plates being bent inwardly toward one another to converge together to define at the point of con-vergence a pair of jaws receiving said wedge piece therebetween;
a toothed rack attached to said wedge piece and a pawl pivotably attached to said rigid member adapted to push said wedge piece into said saw cut from between the jaws formed by said pair of plates;
a lever arm reciprocally moving said pawl, said lever arm being operable by said operator when said wedge piece is interfitted into said saw cut when said operator cuts into said tree with a chain saw.
a pair of spring steel plates spaced apart from one another and each attached to a rigid member;
each of said pair of plates having a main body portion extending outwardly from said rigid member and in the same direction as each other, each of said pair of plates being bent inwardly toward one another to converge together to define at the point of con-vergence a pair of jaws receiving said wedge piece therebetween;
a toothed rack attached to said wedge piece and a pawl pivotably attached to said rigid member adapted to push said wedge piece into said saw cut from between the jaws formed by said pair of plates;
a lever arm reciprocally moving said pawl, said lever arm being operable by said operator when said wedge piece is interfitted into said saw cut when said operator cuts into said tree with a chain saw.
2. A tree felling wedge device as claimed in claim 1, wherein each of said pair of plates has part of its main body portion remote from the rigid member bent to overlie one another in parallel relationship.
3. A tree felling wedge as claimed in claim 1, wherein the wedge piece is made of plastic.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI362572A FI48798C (en) | 1972-12-21 | 1972-12-21 | Tree felling wedge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1048995A true CA1048995A (en) | 1979-02-20 |
Family
ID=8508612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA73188749A Expired CA1048995A (en) | 1972-12-21 | 1973-12-21 | Tree felling wedge |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT325884B (en) |
| CA (1) | CA1048995A (en) |
| CH (1) | CH568704A5 (en) |
| DE (1) | DE2362848A1 (en) |
| FI (1) | FI48798C (en) |
| FR (1) | FR2211175B3 (en) |
| NO (1) | NO134478C (en) |
| SE (1) | SE399354B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1507749A (en) * | 1975-08-29 | 1978-04-19 | Dushku V | Manually operated jack for use in tree felling |
| SE391109B (en) * | 1976-04-14 | 1977-02-07 | Nordfor Ab | THREE FELLING KITS AND DEVICE FOR PERFORMING THE KIT |
| DE102014007416A1 (en) * | 2014-05-22 | 2015-11-26 | Atemag Aggregatetechnologie Und Manufaktur Ag | Hydraulic-mechanical felling wedge for insertion into the sawing slit of a tree |
| DE102014010021B4 (en) * | 2014-07-08 | 2020-03-26 | Gottlieb Nestle Gmbh | Tree felling wedge |
-
1972
- 1972-12-21 FI FI362572A patent/FI48798C/en active
-
1973
- 1973-12-17 CH CH1764573A patent/CH568704A5/xx not_active IP Right Cessation
- 1973-12-18 DE DE19732362848 patent/DE2362848A1/en active Pending
- 1973-12-18 NO NO482573A patent/NO134478C/no unknown
- 1973-12-19 FR FR7345469A patent/FR2211175B3/fr not_active Expired
- 1973-12-20 AT AT1067073A patent/AT325884B/en not_active IP Right Cessation
- 1973-12-20 SE SE7317204A patent/SE399354B/en unknown
- 1973-12-21 CA CA73188749A patent/CA1048995A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ATA1067073A (en) | 1975-01-15 |
| FI48798C (en) | 1975-01-10 |
| NO134478C (en) | 1976-10-20 |
| AT325884B (en) | 1975-11-10 |
| FR2211175A1 (en) | 1974-07-19 |
| FI48798B (en) | 1974-09-30 |
| DE2362848A1 (en) | 1974-06-27 |
| FR2211175B3 (en) | 1976-10-15 |
| SE399354B (en) | 1978-02-13 |
| CH568704A5 (en) | 1975-11-14 |
| NO134478B (en) | 1976-07-12 |
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