CA2146719C - Mechanism for rotating a tree-felling implement and tree-felling implement therewith - Google Patents
Mechanism for rotating a tree-felling implement and tree-felling implement therewithInfo
- Publication number
- CA2146719C CA2146719C CA002146719A CA2146719A CA2146719C CA 2146719 C CA2146719 C CA 2146719C CA 002146719 A CA002146719 A CA 002146719A CA 2146719 A CA2146719 A CA 2146719A CA 2146719 C CA2146719 C CA 2146719C
- Authority
- CA
- Canada
- Prior art keywords
- implement
- rack
- boom
- tree
- pivot
- 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 - Fee Related
Links
Classifications
-
- 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
- A01G23/08—Felling trees
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Environmental Sciences (AREA)
- Mechanical Control Devices (AREA)
- Shovels (AREA)
Abstract
The mechanism is used for rotating a tree-felling implement rotatably mounted with a pivot to the distal end of the boom of a logging vehicle. The mechanism, the tree-felling implement, the boom and the logging vehicle form a tree-felling machine controlled by an operator and used on logging sites. The mechanism comprises a pinion coaxial with the implement pivot and fixed in rotation with reference to the distal end of the boom. An arc-shaped rack is rotatably mounted on the frame of the implement by a rack pivot in spaced relationship with the pinion. The rack is in mesh with the pinion and hydraulic actuators are provided on the frame of the implement for swaying the rack and thereby rotating the implement with reference to the boom. Such mechanism is capable of rotating the tree-felling implement with reference to the boom plane in both directions and according to a much wider range angle than the prior art mechanisms.
Description
21 ~6~1~
~fRrUANr.sl-l FOR F~O'E'ATING A TRE E-FELLING IMPLEMENT
AND TREE--FELLING IMPLEMENT ~ w FIELI~ OF THE INVENTION
The present invention relates to a m~hAni sm for rotating a tree-felling implement rotatably mounted at the distal end of the boom of a logging vehicle. The r?~h~ni ~m, the tree-felling implement, the boom and the logging vehicle 10 form a tree-felling machine controlled by an operator and is to be used on logging ~ites.
BACKGROUND OF TEIE INVENTION
Tree-felling machines are u6ed in r^-h~ni ~ed tree harvesting for cutting down trees instead of using a manual chain saw. Each machin0 comprises a logging vehicle with a boom at the end of which is provided a tree-felling implement. In use, ta cut down an ad~acent tree, the 20 operator moves the implement towards the base of the tree.
The implement then grab~; a trunk with a set of hydraulically actuated arms and cuts the trunk at the base with a saw or a felling shear. The trunk is laid down on the ground or in a truck afterwards. Some implements can also remove branches 25 from the trunk while still grabbing it, otherwise branches may be removed by another machine or a manual chain saw, or even not be removed at all.
Because the boom is generally moving only in the vertical plane, the implement has to be able to rotate with 30 reference to the boom p]~ane so that it may grab an inclined or curved tree, or a tree laying on the ground. In conventional tree-fellir~g machines, the implement is rotated by means of a single obliaue hydraulic actuator having one end operatively attached to the boom and another end 35 operatively attached to the implement. With such embodiment, the implement may not be rotated around its pivot according 21~719 to a wide range angle and this alters greatly the flexibility of the machine. In some situations, the operator may have to move the machine around the tree until a suitable angle is founcl, which may not be always possible because of the ugually soft soil and all the obstacles in a logging site. This therefore lowers productivity and addR
unnecessary wear to the machine parts.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a simple and reliable r-~-bAni 8m for rotating a tree-felling implement, and a tree-felling implement with such r-~hAn;Rm.
It is further an object of the present invention to provide a r~hAniRm capable of rotating the implement with reference to the boom plane in both directions and according to a wide range angle.
More particularly, the ob~ect of the preRent invention is to provide a r- -hAni F'n for rotating a tree-felling implement, the tree-felling implement comprising a frane rotatably connectable to a distal end of a boom of a logging vehicle by an~ implement pivot, the mechanism comprising:
a pinion coaxial with the implement pivot and fixed in rotation with reference to the distal end of the boom;
an arc-shaped rack rotatably mounted on the frame of the implement by a rack pivot in spaced relationship ~iith the pinion, the rack being in mesh with the pinion; and actuating means provided on the frame of the implement for swaying the rack and thereby rotating the implement with ref erence to the boom .
It is also an object of the present invention to provide a tree-felling implement comprising:
a frame;
214~71 9 -an implement pivot for rotatably connecting the frame to a distal end of a ~oom of a logging vehicle;
a pinion coaxial ~ith the Lmplement pivot and fixed in rotation with reference to tlhe distal end of the boom;
an arc-shaped rac3~ rotatably mounted on the frame of the implement ~y a rack pivot in spaced relationship with the pinion, the rack being in mesh with the pinion; and actuating means provided on the frame of the implement for swaying the rack and thereby rotating the implement with reference to the boom.
A non restrlctive description of a preferred : ` lo~ nt Will now be given with reference to the ~rr.ond~rl drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view of a logging vehicle with the tree-felling implement according to the present invention.
FIG. 2 i5 a rear view of the implement, showing the implement in 3 central position with reference to the boom axis.
FIG. 3 is a top view of the implement in FIG. 2, shown without the pinion and the hydraulic actuators of the rack.
FIG. 4 is an elevational view of the implement shown in FIG. 2, showing the implement in an example of an extreme angulctr position.
~ 21~6719 DESCRIPTION OF A PREFERRED EMBODIMENT
Reference numerals The description and the drawings use the following reference numerals:
10 tree-felling machille 10 12 logging vehicle 14 boom plane 2 o boom 22 proximal boom member 24 distal boom member 15 26 boom hydraulic actuator 28 boom hydraulic act~lator 30 boom hydraulic actuator 32 first lever 34 second lever 20 40 tree-felling imple~ent 42 frame 44 trunk grabbing arm6 46 hydraulic actuators ~of the trunk grabbing arms) 48 circular saw 25 49 protective cacing 50 implement pivot 52 linking element 54 first pivot (of the boom linking element) 56 second pivot (of the boom linking element) 30 60 actuating rs~hAni ~:m 62 pinion G4 pinion teeth 66 arc-shaped rack 68 rack teeth 35 70 rack pivot 72 rack hydraulic actuators 74 rack lateral locations General description of t~le invention A6 shown in FIG. 1, the tree-felling machine (10) compri~es a self-propelled logging vehicle (12) adapted for use on logging sites and controlled by an operator sitting inside a cabin thereof. As apparent for a person skilled in 45 the art, many other kind~ of logging vehicles can be used instead of the one illustrated in FIG. l.
21~7~9 An articulated boom (20) is operatively mounted on the vehicle (12). This L-~oom (20) is known as a felling boom or a tree boom. Its purpose is to allow movement of a tree-felling implement (40) in the vertical plane. The implement 5 (40) is rotatably connected at the distal end of the boom (20) by means of an impLement pivot (50). The boom (20) is described in details further in the text.
The tree-fel]ing implement (40) is used for cutting down the trees instead of using a manual chain saw.
10 In use, to cut down an a~jacent tree, the operator moves the implement (40) towards the base of the tree. The implement (40) then grabs a trunk ~ith a set of hydraulically actuated trunk grabbing arms ( 44 ) and cut the trunk at the base with a circular saw (48). ALternatively, a felling shear (not 15 shown) may be used. The trunk is laid down on the ground or in a truck afterwards. The implement (40) is described in details further in the text.
Because the baom ( 20 ) is generally moving only in the vertical plane, hereinafter referred to as "the boom 20 plane (14)", the implement (50) has to be able to rotate around the implement p ivot ( 50 ) so that it may grab an inclined or curved tree, or a tree laying on the ground. The present invention provicles a simple and reliable r-~ hAni Fm (60) capable of rotatincl the implement (40) with reference 25 to the boom plane ( 14 ) in both directions, clockwise and counterclockwise, and capable of having a wide range angle.
Although the present invention allows the implement (40) to have range angles of gO~ and over, one may choose to restrict the range angle to a value under 45 and use the 30 r~^hAni~m (60) of the present invention for its other advantages. Uneven extreme angles with reference to the boom plane ( 14 ) are also possible if desired. The actuating r- hAn;Fr (60) is described in details further in the text.
21~67~ 9 The boom The boom (20) comprises a proximal boom member 5 (22) and a clistal boom member (24) operatively connected to each other. The proximal boom member (22) i5 operatively connected to the vehic!le ( 12 ) and is rotated by mean5 of a hydraulic actuator ( 26 ) of the boom. The distal boom member (24) is rotated with reference to the proximal boom member 10 (22) by means of a hydraulic actuator (28) of the boom.
Specific construction details are known in the art of heavy machinery .
In addition 1:o the movement in the vertical plane, the boom (20) may be articulated at this proximal end (not 15 shown) for left and right rotations with reference to the vehicle (12). Alternatively, the vehicle (12) may be able to turn on itself, as it is the case for the one illustrated in FIG. 1.
The boom ( 20 ) comprises other elements that are 20 described further in tlhe text.
The tree-felling implelnent The tree-fel] ing implement (40) itself is a device 25 known in the art . It comprises a main frame ( 42 ) on which is located a trunk grabbi]lg means, such as the trunk grabbing arms (44) actuated by the hydraulic actuators (46). The implement further comprises a circular saw (48), as best shown in FIG. 3, and a protective casing ( 49 ) therefor.
30 Other tree cutting means, such as a felling shear (not shown) may be used instead of the saw (48).
The implement pivot ( 50 ) is a bearing supporting the weight of the implement ( 40 ) and of a tree when one is in the implement (40). It comprises the usual parts for such 35 a bearing, as apparent for a person skilled in the art.
214~
The actuating r~^hAnif:l~ for rotating the implement The actuating ~ h;lni~:~ (60) compri6es a pinion (62) coaxial with the implement pivot (50), more precisely with the center of rotation thereof. The pinion (62) ie fixed in rotation with reference to the distal end of the boom ( 2 o ) .
The r^-h;~ni~rl (60) further comprises an arc-shaped rack ~66) rotatably mounted on the frame (42) of the implement (40) by a rack pivot (70) in spaced relationship with the pinion (62), more precisely its center. The rack pivot ( 70 ) is in spaced relationship with the center of the pinion (62) so that a virtual mechanical lever arm is defined. The rack (66~ preferably has teeth (68) in mesh with corresponding teeth ( 64 ) on the pinion ( 62 ) .
An actuating means is provided on the frame (42) of the implement (40) for swaying the rack (66). The actuating means preferably compriseg two reciprocal hydraulic actuators (72) ~ymmetrically disposed about the rack (66). The actuators (72) have one end operatively connected to the frame (42) of the implement (40), and another end operatively connected to the rack ( 66 ) on a respective lateral location (74) thereon with reference to the rack pivot ( 70 ) . The lateral locations ( 74 ) are in spaced relationship with the rack pivot (70) for defining virtual mechanical lever arms by which the force applied by the actuators ( 72 ) is converted into a torque, itself transmitted to the pinion (62).
Upon activation of the actuators (74), which move reciprocally, they apply a force resulting in a torque that rotates the rack (66) around the rack pivot (70). Because the implement ( 40 ) is l^otatably connected to the boom ( 20 ) and the pinion (62) is Eixed in rotation with respect to the boom (20), the movement of the rack (66) rotates the whole implement (40) around the implement pivot (50).
Of course, other actuating mechanisms and arrangemente are also possible. For example, the actuating means may comprise a hydraulic motor (not shown).
5 The linking element The linking element ( 52 ) is used for rotatably connecting the implement ( 40 ) to the distal end of the distal boom member ( 24 ) . According to a preferred 10 embodiment, as shown in FIG. 1, the linking element (52) comprises a first pivot (54), for connecting the implement (40) to the boom (20). A second pivot (56) is provided, closer to the frame (42) than the ~irst pivot (54) for rotatably connecting the implement (40) to an end of a first 15 lever (32). The first lever (32) has an opposed end rotatably connected to a hydraulic actuator (30) of the boom. The same end of tne first lever (32) is also rotatably connected to an end of a second lever (34). The second lever (34) has an opposed en~ rotatably connected to the boom 20 (20). ~ith this arrangement, the linking element (52) is moved in the boom plane ( 14 ) whenever the hydraulic actuator ( 30 ) is operated, thereby also moving the implement ( 40 ) in the boom plane (14).
25 Scope of the present desaription Although a preferred embodiment of the invention has been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the 30 invention is not limited to this precise e~ 7--t and that various changes and modifications may be effected therein without departing from the scope or spirit of the invention.
~fRrUANr.sl-l FOR F~O'E'ATING A TRE E-FELLING IMPLEMENT
AND TREE--FELLING IMPLEMENT ~ w FIELI~ OF THE INVENTION
The present invention relates to a m~hAni sm for rotating a tree-felling implement rotatably mounted at the distal end of the boom of a logging vehicle. The r?~h~ni ~m, the tree-felling implement, the boom and the logging vehicle 10 form a tree-felling machine controlled by an operator and is to be used on logging ~ites.
BACKGROUND OF TEIE INVENTION
Tree-felling machines are u6ed in r^-h~ni ~ed tree harvesting for cutting down trees instead of using a manual chain saw. Each machin0 comprises a logging vehicle with a boom at the end of which is provided a tree-felling implement. In use, ta cut down an ad~acent tree, the 20 operator moves the implement towards the base of the tree.
The implement then grab~; a trunk with a set of hydraulically actuated arms and cuts the trunk at the base with a saw or a felling shear. The trunk is laid down on the ground or in a truck afterwards. Some implements can also remove branches 25 from the trunk while still grabbing it, otherwise branches may be removed by another machine or a manual chain saw, or even not be removed at all.
Because the boom is generally moving only in the vertical plane, the implement has to be able to rotate with 30 reference to the boom p]~ane so that it may grab an inclined or curved tree, or a tree laying on the ground. In conventional tree-fellir~g machines, the implement is rotated by means of a single obliaue hydraulic actuator having one end operatively attached to the boom and another end 35 operatively attached to the implement. With such embodiment, the implement may not be rotated around its pivot according 21~719 to a wide range angle and this alters greatly the flexibility of the machine. In some situations, the operator may have to move the machine around the tree until a suitable angle is founcl, which may not be always possible because of the ugually soft soil and all the obstacles in a logging site. This therefore lowers productivity and addR
unnecessary wear to the machine parts.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a simple and reliable r-~-bAni 8m for rotating a tree-felling implement, and a tree-felling implement with such r-~hAn;Rm.
It is further an object of the present invention to provide a r~hAniRm capable of rotating the implement with reference to the boom plane in both directions and according to a wide range angle.
More particularly, the ob~ect of the preRent invention is to provide a r- -hAni F'n for rotating a tree-felling implement, the tree-felling implement comprising a frane rotatably connectable to a distal end of a boom of a logging vehicle by an~ implement pivot, the mechanism comprising:
a pinion coaxial with the implement pivot and fixed in rotation with reference to the distal end of the boom;
an arc-shaped rack rotatably mounted on the frame of the implement by a rack pivot in spaced relationship ~iith the pinion, the rack being in mesh with the pinion; and actuating means provided on the frame of the implement for swaying the rack and thereby rotating the implement with ref erence to the boom .
It is also an object of the present invention to provide a tree-felling implement comprising:
a frame;
214~71 9 -an implement pivot for rotatably connecting the frame to a distal end of a ~oom of a logging vehicle;
a pinion coaxial ~ith the Lmplement pivot and fixed in rotation with reference to tlhe distal end of the boom;
an arc-shaped rac3~ rotatably mounted on the frame of the implement ~y a rack pivot in spaced relationship with the pinion, the rack being in mesh with the pinion; and actuating means provided on the frame of the implement for swaying the rack and thereby rotating the implement with reference to the boom.
A non restrlctive description of a preferred : ` lo~ nt Will now be given with reference to the ~rr.ond~rl drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view of a logging vehicle with the tree-felling implement according to the present invention.
FIG. 2 i5 a rear view of the implement, showing the implement in 3 central position with reference to the boom axis.
FIG. 3 is a top view of the implement in FIG. 2, shown without the pinion and the hydraulic actuators of the rack.
FIG. 4 is an elevational view of the implement shown in FIG. 2, showing the implement in an example of an extreme angulctr position.
~ 21~6719 DESCRIPTION OF A PREFERRED EMBODIMENT
Reference numerals The description and the drawings use the following reference numerals:
10 tree-felling machille 10 12 logging vehicle 14 boom plane 2 o boom 22 proximal boom member 24 distal boom member 15 26 boom hydraulic actuator 28 boom hydraulic act~lator 30 boom hydraulic actuator 32 first lever 34 second lever 20 40 tree-felling imple~ent 42 frame 44 trunk grabbing arm6 46 hydraulic actuators ~of the trunk grabbing arms) 48 circular saw 25 49 protective cacing 50 implement pivot 52 linking element 54 first pivot (of the boom linking element) 56 second pivot (of the boom linking element) 30 60 actuating rs~hAni ~:m 62 pinion G4 pinion teeth 66 arc-shaped rack 68 rack teeth 35 70 rack pivot 72 rack hydraulic actuators 74 rack lateral locations General description of t~le invention A6 shown in FIG. 1, the tree-felling machine (10) compri~es a self-propelled logging vehicle (12) adapted for use on logging sites and controlled by an operator sitting inside a cabin thereof. As apparent for a person skilled in 45 the art, many other kind~ of logging vehicles can be used instead of the one illustrated in FIG. l.
21~7~9 An articulated boom (20) is operatively mounted on the vehicle (12). This L-~oom (20) is known as a felling boom or a tree boom. Its purpose is to allow movement of a tree-felling implement (40) in the vertical plane. The implement 5 (40) is rotatably connected at the distal end of the boom (20) by means of an impLement pivot (50). The boom (20) is described in details further in the text.
The tree-fel]ing implement (40) is used for cutting down the trees instead of using a manual chain saw.
10 In use, to cut down an a~jacent tree, the operator moves the implement (40) towards the base of the tree. The implement (40) then grabs a trunk ~ith a set of hydraulically actuated trunk grabbing arms ( 44 ) and cut the trunk at the base with a circular saw (48). ALternatively, a felling shear (not 15 shown) may be used. The trunk is laid down on the ground or in a truck afterwards. The implement (40) is described in details further in the text.
Because the baom ( 20 ) is generally moving only in the vertical plane, hereinafter referred to as "the boom 20 plane (14)", the implement (50) has to be able to rotate around the implement p ivot ( 50 ) so that it may grab an inclined or curved tree, or a tree laying on the ground. The present invention provicles a simple and reliable r-~ hAni Fm (60) capable of rotatincl the implement (40) with reference 25 to the boom plane ( 14 ) in both directions, clockwise and counterclockwise, and capable of having a wide range angle.
Although the present invention allows the implement (40) to have range angles of gO~ and over, one may choose to restrict the range angle to a value under 45 and use the 30 r~^hAni~m (60) of the present invention for its other advantages. Uneven extreme angles with reference to the boom plane ( 14 ) are also possible if desired. The actuating r- hAn;Fr (60) is described in details further in the text.
21~67~ 9 The boom The boom (20) comprises a proximal boom member 5 (22) and a clistal boom member (24) operatively connected to each other. The proximal boom member (22) i5 operatively connected to the vehic!le ( 12 ) and is rotated by mean5 of a hydraulic actuator ( 26 ) of the boom. The distal boom member (24) is rotated with reference to the proximal boom member 10 (22) by means of a hydraulic actuator (28) of the boom.
Specific construction details are known in the art of heavy machinery .
In addition 1:o the movement in the vertical plane, the boom (20) may be articulated at this proximal end (not 15 shown) for left and right rotations with reference to the vehicle (12). Alternatively, the vehicle (12) may be able to turn on itself, as it is the case for the one illustrated in FIG. 1.
The boom ( 20 ) comprises other elements that are 20 described further in tlhe text.
The tree-felling implelnent The tree-fel] ing implement (40) itself is a device 25 known in the art . It comprises a main frame ( 42 ) on which is located a trunk grabbi]lg means, such as the trunk grabbing arms (44) actuated by the hydraulic actuators (46). The implement further comprises a circular saw (48), as best shown in FIG. 3, and a protective casing ( 49 ) therefor.
30 Other tree cutting means, such as a felling shear (not shown) may be used instead of the saw (48).
The implement pivot ( 50 ) is a bearing supporting the weight of the implement ( 40 ) and of a tree when one is in the implement (40). It comprises the usual parts for such 35 a bearing, as apparent for a person skilled in the art.
214~
The actuating r~^hAnif:l~ for rotating the implement The actuating ~ h;lni~:~ (60) compri6es a pinion (62) coaxial with the implement pivot (50), more precisely with the center of rotation thereof. The pinion (62) ie fixed in rotation with reference to the distal end of the boom ( 2 o ) .
The r^-h;~ni~rl (60) further comprises an arc-shaped rack ~66) rotatably mounted on the frame (42) of the implement (40) by a rack pivot (70) in spaced relationship with the pinion (62), more precisely its center. The rack pivot ( 70 ) is in spaced relationship with the center of the pinion (62) so that a virtual mechanical lever arm is defined. The rack (66~ preferably has teeth (68) in mesh with corresponding teeth ( 64 ) on the pinion ( 62 ) .
An actuating means is provided on the frame (42) of the implement (40) for swaying the rack (66). The actuating means preferably compriseg two reciprocal hydraulic actuators (72) ~ymmetrically disposed about the rack (66). The actuators (72) have one end operatively connected to the frame (42) of the implement (40), and another end operatively connected to the rack ( 66 ) on a respective lateral location (74) thereon with reference to the rack pivot ( 70 ) . The lateral locations ( 74 ) are in spaced relationship with the rack pivot (70) for defining virtual mechanical lever arms by which the force applied by the actuators ( 72 ) is converted into a torque, itself transmitted to the pinion (62).
Upon activation of the actuators (74), which move reciprocally, they apply a force resulting in a torque that rotates the rack (66) around the rack pivot (70). Because the implement ( 40 ) is l^otatably connected to the boom ( 20 ) and the pinion (62) is Eixed in rotation with respect to the boom (20), the movement of the rack (66) rotates the whole implement (40) around the implement pivot (50).
Of course, other actuating mechanisms and arrangemente are also possible. For example, the actuating means may comprise a hydraulic motor (not shown).
5 The linking element The linking element ( 52 ) is used for rotatably connecting the implement ( 40 ) to the distal end of the distal boom member ( 24 ) . According to a preferred 10 embodiment, as shown in FIG. 1, the linking element (52) comprises a first pivot (54), for connecting the implement (40) to the boom (20). A second pivot (56) is provided, closer to the frame (42) than the ~irst pivot (54) for rotatably connecting the implement (40) to an end of a first 15 lever (32). The first lever (32) has an opposed end rotatably connected to a hydraulic actuator (30) of the boom. The same end of tne first lever (32) is also rotatably connected to an end of a second lever (34). The second lever (34) has an opposed en~ rotatably connected to the boom 20 (20). ~ith this arrangement, the linking element (52) is moved in the boom plane ( 14 ) whenever the hydraulic actuator ( 30 ) is operated, thereby also moving the implement ( 40 ) in the boom plane (14).
25 Scope of the present desaription Although a preferred embodiment of the invention has been described in detail herein and illustrated in the accompanying drawings, it is to be understood that the 30 invention is not limited to this precise e~ 7--t and that various changes and modifications may be effected therein without departing from the scope or spirit of the invention.
Claims (7)
1. A mechanism for rotating a tree-felling implement, the tree-felling implement comprising a frame rotatably connectable to a distal end of a boom of a logging vehicle by an implement pivot, the mechanism comprising:
a pinion coaxial with the implement pivot and fixed in rotation with reference to the distal end of the boom;
an arc-shaped rack rotatably mounted on the frame of the implement by a rack pivot in spaced relationship with the pinion, the rack being in mesh with the pinion; and actuating means provided on the frame of the implement for swaying the rack and thereby rotating the implement with reference to the boom.
a pinion coaxial with the implement pivot and fixed in rotation with reference to the distal end of the boom;
an arc-shaped rack rotatably mounted on the frame of the implement by a rack pivot in spaced relationship with the pinion, the rack being in mesh with the pinion; and actuating means provided on the frame of the implement for swaying the rack and thereby rotating the implement with reference to the boom.
2. A mechanism according to claim 1, wherein the actuating mechanism comprises at least one actuator having one end operatively connected to the frame of the implement, and another end operatively connected to the rack on a lateral location thereon with reference to the rack pivot.
3. A mechanism according to claim 1, wherein the actuating means comprises two reciprocal hydraulic actuators symmetrically disposed of the rack, the actuators having one end operatively connected to the frame of the implement, and another end operatively connected to the rack on a respective lateral location thereon with reference to the rack pivot.
4. A tree-felling implement comprising:
a frame;
an implement pivot for rotatably connecting the frame to a distal end of a boom of a logging vehicle;
a pinion coaxial with the implement pivot and fixed in rotation with reference to the distal end of the boom;
an arc-shaped rack rotatably mounted on the frame of the implement by a rack pivot in spaced relationship with the pinion, the rack being in mesh with the pinion; and actuating means provided on the frame of the implement for swaying the rack and thereby rotating the implement with reference to the boom.
a frame;
an implement pivot for rotatably connecting the frame to a distal end of a boom of a logging vehicle;
a pinion coaxial with the implement pivot and fixed in rotation with reference to the distal end of the boom;
an arc-shaped rack rotatably mounted on the frame of the implement by a rack pivot in spaced relationship with the pinion, the rack being in mesh with the pinion; and actuating means provided on the frame of the implement for swaying the rack and thereby rotating the implement with reference to the boom.
5. A tree-felling implement according to claim 5, wherein the actuating mechanism comprises at least one actuator having one end operatively connected to the frame of the implement, and another end operatively connected to the rack on a lateral location thereon with reference to the rack pivot.
6. A tree-felling implement according to claim 5, wherein the actuating means comprises two reciprocal hydraulic actuators symmetrically disposed on the rack, the actuators having one end operatively connected to the frame of the implement, and another end operatively connected to the rack on a respective lateral location thereon with reference to the rack pivot.
7. A tree-felling implement according to claim 5, further comprising a linking element having a first pivot for rotatably connecting the implement to the distal end of the boom, and a second pivot closer to the frame than the first pivot for rotatably connecting the implement to an end of a first lever, the first lever having an opposed end rotatably connected to a hydraulic actuator of the boom and an end of a second lever, itself having an opposed end rotatably connected to the boom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002146719A CA2146719C (en) | 1995-04-10 | 1995-04-10 | Mechanism for rotating a tree-felling implement and tree-felling implement therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002146719A CA2146719C (en) | 1995-04-10 | 1995-04-10 | Mechanism for rotating a tree-felling implement and tree-felling implement therewith |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2146719A1 CA2146719A1 (en) | 1996-10-11 |
| CA2146719C true CA2146719C (en) | 1999-12-21 |
Family
ID=4155624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002146719A Expired - Fee Related CA2146719C (en) | 1995-04-10 | 1995-04-10 | Mechanism for rotating a tree-felling implement and tree-felling implement therewith |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2146719C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8141602B2 (en) | 2008-09-19 | 2012-03-27 | Usinage Gn Roy Inc. | Rotation system for a felling head |
| JP7238865B2 (en) * | 2020-07-28 | 2023-03-14 | トヨタ自動車株式会社 | Collection method and collection system |
-
1995
- 1995-04-10 CA CA002146719A patent/CA2146719C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2146719A1 (en) | 1996-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5553993A (en) | Mechanism for rotating a tree-felling implement and tree-felling implement therewith | |
| US4063359A (en) | Vehicle mounted boom apparatus | |
| US4802327A (en) | Mower attachment | |
| US5390715A (en) | Tree pruning apparatus | |
| US4269241A (en) | Process and apparatus for severing limbs | |
| US5201350A (en) | Work head with rotatably mounted chain saw | |
| CA2115280C (en) | Tree delimbing and felling apparatus | |
| AU600716B2 (en) | Brush cutter | |
| US3032956A (en) | Mobile weed and brush cutting machine | |
| AU566185B2 (en) | Swath cutting gripping tree delimber | |
| US4321761A (en) | Device for uprooting tree stumps | |
| CA2269692A1 (en) | Apparatus for lifting and moving trees for transplantation | |
| EP0666023B1 (en) | Brush cutter work head with pivotable shroud | |
| US9603314B2 (en) | Vehicle with feller for tree limb removal in residential, commercial, municipal, utility, and line clearance applications | |
| US6343633B1 (en) | Tree harvester | |
| CA2146719C (en) | Mechanism for rotating a tree-felling implement and tree-felling implement therewith | |
| JP3783121B2 (en) | Cutting machine with automatically retracting stopper | |
| WO1998006251A1 (en) | Agricultural implement | |
| CA2188057A1 (en) | Mechanism for rotating a tree-felling implement and tree-felling implement therewith | |
| FR2569216A1 (en) | Cleaning device, particularly for trenches perpendicular to a road | |
| EP2197779B1 (en) | Articulated mechanical arm | |
| JPH0448648Y2 (en) | ||
| JPS5812927Y2 (en) | Work equipment arm lift restriction device | |
| JP3223925B2 (en) | Excavator | |
| JPH10117548A (en) | Work device used also for work wagon |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20130410 |