CA1261791A - Skidder with improved boom, grapple and bunk assembly - Google Patents
Skidder with improved boom, grapple and bunk assemblyInfo
- Publication number
- CA1261791A CA1261791A CA000463370A CA463370A CA1261791A CA 1261791 A CA1261791 A CA 1261791A CA 000463370 A CA000463370 A CA 000463370A CA 463370 A CA463370 A CA 463370A CA 1261791 A CA1261791 A CA 1261791A
- Authority
- CA
- Canada
- Prior art keywords
- grapple
- bunk
- vehicle
- stick
- boom
- 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
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
- A01G23/003—Collecting felled trees
- A01G23/006—Log skidders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
- B66C1/58—Gripping members engaging only the external or internal surfaces of the articles and deforming the articles, e.g. by using gripping members such as tongs or grapples
- B66C1/585—Log grapples
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
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)
- Shovels (AREA)
Abstract
A B S T R A C T
A tree skidder having a combined boom, grapple and bunk assembly mounted on the skidding vehicle and movable longitudinally relative thereto and actuated by hydraulic power means for effecting the longitudinal movement, the grapple of the assembly is also provided with abutments to engage the load, stabilizing the grapple relative to the load of trees grasped by the grapple. The bunk consists of two members between which the grapple is located during the skidding, and one bunk is pivotally mounted so as to be movable towards and away from the other bunk permitting grasping the grapple therebetween, stabilizing the same when moving from one location to another without carrying a load.
A tree skidder having a combined boom, grapple and bunk assembly mounted on the skidding vehicle and movable longitudinally relative thereto and actuated by hydraulic power means for effecting the longitudinal movement, the grapple of the assembly is also provided with abutments to engage the load, stabilizing the grapple relative to the load of trees grasped by the grapple. The bunk consists of two members between which the grapple is located during the skidding, and one bunk is pivotally mounted so as to be movable towards and away from the other bunk permitting grasping the grapple therebetween, stabilizing the same when moving from one location to another without carrying a load.
Description
This invention relates to an improved combined boom, grapple and bunk assembly for a tree skidding vehicle and a tree skidding vehicle incorporating the same.
The present invention is particularly directed to an improvement over the tree skidders disclosed in Canadian Patent 934,712 and 900,416 issued May 16, 1972 and owned by Logging Development Corporation.
Tree skidders equipped with conventional grapples such as disclosed in Canadian Patent 991,590 issued June 22, 1976 to Clark Equipment Company, suffer from high loading on the rear wheels. The load is imposed on the vehicle at a point high above the rear axle causing a moment which tends to lift the front of the skidder and transfer loads to the rear. One of the negative effects of this is that skidders so equipped tend to get stuck on ground which will not support these magnified loads. One of the operator's options, in such cases, is to use the reach of the boom,moun-ting the grapple on the skidderj to try to thrust the vehicle forward using the load as an anchor. This i5 usually ineffective because the achievable stroke is usually ; less than a tire diameter and sometimes less -than a tire radius. The operator must therefore drop his load, free his vehicle, and try to recover the load from firnl ground , ~
;
7~
with his winch and cable system. This whole process is time consuming and strenuous for both vehicle and operator.
The arrangement disclosed in the afore-mentioned Canadian Patents 900,416 and 934,712 solves to some extent the foregoing problems by imposing the load on the vehicle at a point which substantially decreases the load concentration on the rear of the vehicle. This reduces the tendency to get stuck but should one do so, the reach of the boom is greater than in the prior art devices, increasing the possibility o~ freeing the vehicle without releasing the load.
Another problem with the known skidders is that there is nothing to secure the grapple in posi-tion on the vehicle in travelling without a load from one position to another, the grapple being freely suspended from the boom, dangles around, causing damage to the equipment.
An object of the present invention is to provide a simple means for extending the reach of the boom without increasing the size thereof or length of boom members. This is accomplished by having the turn-table for the boom and grapple mounted on a frame which is slidable longitudinally a predetermined amount ., .
,; - 2 -~2~:~7~
relative to the length of the vehicle. Such motion adds to the stroke or reach that can be used for freeing the vehicle from soft ground. The extent of longitudinal movement ls also preferably such that the turntable can be located aft of the rear wheels of the vehicle for maximum boom freedom for loading and grasping a group of logs lying on the ground. The forward movement of the turntable is also preferably such that it can be located at the most favourable point on the vehicle for skidding.
Another improvement provided by the present invention is a stabilizing abutment mechanism on the gxapple.
With prior art devices, without a stabilizing abutment, when pulling with the grapple to load or pushing to free the vehicle the grapple tends to rock or tilt on the load.
This not only reduces the reach of -the boorn for use in pulling the load or pushing the vehicle, but also imposes unpredictable and unnecessary stress on the grapple. The abutment mechanism is arranged so as to abut ~the top of the load on each of opposite sides of the grapple.
A further improvement provided by the present invention is a grapple clamping mechanism which secures the grapple in position when travelling without a load. The grapple clamping mechanism consists of having one of the bunk members pivoted so as to be movable towards and away from the other bunk and act - : :
.
'.'"
~2~
together for clamping the grapple thexebetween.
The invention is illustrated by way of example with reference to the accompanying drawings wherein:
S Figure 1 is a partial side elevational view of the combined boom, grapple and bunk assembly attached to a vehicle, the latter of which is illustrated in broken line;
Figure 2 is a side elevational view of the boom grapple and bunk mechanism provided in accordance with the present invention; and Figure 3 is a right-hand elevational view of Figure 2.
Referring to the drawings, illustrated in lS Figure 1 is a self-loading tree skidder vehicle 10 consisting of self-propelled tractor por-tion 20, having a combined boom, grapple and bunk assembly 3Q mounted thereon. The boom having the grapple suspended from the free end thereof is preferabl~ mounted so that the grapple can be located rearwardly of the vehicle in one position to grasp a load of trees on the ground and thereafter pick up the load of trees and load it on to the bunk. Additionally, as will be discussed more fully hereinafter~ the boom~ grapple,bunk assembly is slidably mounted ~n the vehicle, the amount of sliding movement 7~
preferably being such that in one position the bunk and grapple unit is located rearwardly of the rear wheels of the vehicle and in the forward position, forwardly of such wheels~
The assembly 30 consists of a boom 31, a grapple 32, a mounting assembly 33 permitting the assembly 32 selectively be moved slidably longitudinally of the vehicle,and a pair of abutments or load supporting members 50 and 51.
The boom 31 consists of a main boom member 34 and a secondary boom member 35 pivotally attached thereto as by pivot pin 36. The secondary boom member 35 is pivoted relative to the main boom 34 about pin 36 by a hydraulic cylinder 37 pivotally connected respectively at opposite ends by pins 38 and 39 anchored to respective boom members 35 and 34. The main boom member 34 is pivotally connected by a pin 40 to a base plate 43 which in turn is pi~otally connected for rotational movement on a further plate 44. The plates 43 and 44 effectively is a turntable or fifth wheel assembly, such plates being pivotally interconnected for movement about a substantially vertical axis in any convenient manner. The lower or further plate 44 is slidably mounted on the base 33 and movable from one to another of a rearward and forward position by means of .
- 5 _ ::
, ~' ~ ' '' .: :. . . .
:L2~
one or more hydraulic cylinder units 33A. The sliding movement is provided by a pair of tracks or equivalent mechanism with friction-reducing roller elements 33B
being provided.
S The grapple 32 is a conventional grapple suspended from boom element 35 by pivot pin 60, the grapple consists of a pair of jaw members pivoted by respective ones of a pair of hydraulic cylinder units 61.
During skldding, the lower end of the grapple abuts against the for~ard face of bunk 51, transmitting skidding forces to the bun~ at a favourable position on the vehicle as disclosed in the aforementioned issued patents. Bunk 50 is pivotally mounted on the boom by a pivot pin 50A so as to be movable toward and away from the bunk 51. Pivotal movement of bunk 50 about pin 50~ is effected by way of hydraulic cylinder unit 50B. When travelling without a load, the lower end of the grapple is positively clamped between bunks 50 and 51 by actuating hydraulic cylinder 50B.
The grapple 32 has secured thereto a pair of stabilizing abutments 62 and 63, located respectively on opposite sides of the grapple and positioned for engagement with the upper surface of the bundle of trees being handled. These stabilizing units are provided for the purpose of reducing tilt of the grapple relative to the load ~hen the load is being pulled by the grapple . - .
.
7~
into a loading position on -the bunk and/or utilizing -the forces through the grapple on the load to move the vehicle from one position to another when stuck because of poor ground conditions.
Figures 2 and 3 of the drawings illus-trate the boom grapple and mounting assembly in somewhat more detail and with minor modifications thereto. The main modifications illustrated in Figures 2 and 3 relate -to the mounting 33 for slidably moving -the boom, bunk and grapple assembly longi-tudinally along the vehicle and pivoting the assembly about a vertical axis. Referring to Figure 2, the mounting assembly 33 consists of a pair of channels 70 and 71 disposed in face to face relation providing a track for plate 44 and rollers 33B attached thereto for longitudinal movement lengthwise of the vehicle. Plate 43 is pivotally attached to plate 44 and pivotal movement about the ver-tical axis and pivotal movement is effected by a pair of hydraulic cylinders 33A anchored at one end to the frame 33 which is not slidable relative to the vehicle and at the other end -to the turntable. Actuation of one or the other of the pair of cylinders will effect pivotal movement of the assembly on the base and simultaneous action of the two cylinders will cause longitudinal sliding movement of the unit relative to the vehicle.
: ,;
.~ ` .
: , ,: ', ' -
The present invention is particularly directed to an improvement over the tree skidders disclosed in Canadian Patent 934,712 and 900,416 issued May 16, 1972 and owned by Logging Development Corporation.
Tree skidders equipped with conventional grapples such as disclosed in Canadian Patent 991,590 issued June 22, 1976 to Clark Equipment Company, suffer from high loading on the rear wheels. The load is imposed on the vehicle at a point high above the rear axle causing a moment which tends to lift the front of the skidder and transfer loads to the rear. One of the negative effects of this is that skidders so equipped tend to get stuck on ground which will not support these magnified loads. One of the operator's options, in such cases, is to use the reach of the boom,moun-ting the grapple on the skidderj to try to thrust the vehicle forward using the load as an anchor. This i5 usually ineffective because the achievable stroke is usually ; less than a tire diameter and sometimes less -than a tire radius. The operator must therefore drop his load, free his vehicle, and try to recover the load from firnl ground , ~
;
7~
with his winch and cable system. This whole process is time consuming and strenuous for both vehicle and operator.
The arrangement disclosed in the afore-mentioned Canadian Patents 900,416 and 934,712 solves to some extent the foregoing problems by imposing the load on the vehicle at a point which substantially decreases the load concentration on the rear of the vehicle. This reduces the tendency to get stuck but should one do so, the reach of the boom is greater than in the prior art devices, increasing the possibility o~ freeing the vehicle without releasing the load.
Another problem with the known skidders is that there is nothing to secure the grapple in posi-tion on the vehicle in travelling without a load from one position to another, the grapple being freely suspended from the boom, dangles around, causing damage to the equipment.
An object of the present invention is to provide a simple means for extending the reach of the boom without increasing the size thereof or length of boom members. This is accomplished by having the turn-table for the boom and grapple mounted on a frame which is slidable longitudinally a predetermined amount ., .
,; - 2 -~2~:~7~
relative to the length of the vehicle. Such motion adds to the stroke or reach that can be used for freeing the vehicle from soft ground. The extent of longitudinal movement ls also preferably such that the turntable can be located aft of the rear wheels of the vehicle for maximum boom freedom for loading and grasping a group of logs lying on the ground. The forward movement of the turntable is also preferably such that it can be located at the most favourable point on the vehicle for skidding.
Another improvement provided by the present invention is a stabilizing abutment mechanism on the gxapple.
With prior art devices, without a stabilizing abutment, when pulling with the grapple to load or pushing to free the vehicle the grapple tends to rock or tilt on the load.
This not only reduces the reach of -the boorn for use in pulling the load or pushing the vehicle, but also imposes unpredictable and unnecessary stress on the grapple. The abutment mechanism is arranged so as to abut ~the top of the load on each of opposite sides of the grapple.
A further improvement provided by the present invention is a grapple clamping mechanism which secures the grapple in position when travelling without a load. The grapple clamping mechanism consists of having one of the bunk members pivoted so as to be movable towards and away from the other bunk and act - : :
.
'.'"
~2~
together for clamping the grapple thexebetween.
The invention is illustrated by way of example with reference to the accompanying drawings wherein:
S Figure 1 is a partial side elevational view of the combined boom, grapple and bunk assembly attached to a vehicle, the latter of which is illustrated in broken line;
Figure 2 is a side elevational view of the boom grapple and bunk mechanism provided in accordance with the present invention; and Figure 3 is a right-hand elevational view of Figure 2.
Referring to the drawings, illustrated in lS Figure 1 is a self-loading tree skidder vehicle 10 consisting of self-propelled tractor por-tion 20, having a combined boom, grapple and bunk assembly 3Q mounted thereon. The boom having the grapple suspended from the free end thereof is preferabl~ mounted so that the grapple can be located rearwardly of the vehicle in one position to grasp a load of trees on the ground and thereafter pick up the load of trees and load it on to the bunk. Additionally, as will be discussed more fully hereinafter~ the boom~ grapple,bunk assembly is slidably mounted ~n the vehicle, the amount of sliding movement 7~
preferably being such that in one position the bunk and grapple unit is located rearwardly of the rear wheels of the vehicle and in the forward position, forwardly of such wheels~
The assembly 30 consists of a boom 31, a grapple 32, a mounting assembly 33 permitting the assembly 32 selectively be moved slidably longitudinally of the vehicle,and a pair of abutments or load supporting members 50 and 51.
The boom 31 consists of a main boom member 34 and a secondary boom member 35 pivotally attached thereto as by pivot pin 36. The secondary boom member 35 is pivoted relative to the main boom 34 about pin 36 by a hydraulic cylinder 37 pivotally connected respectively at opposite ends by pins 38 and 39 anchored to respective boom members 35 and 34. The main boom member 34 is pivotally connected by a pin 40 to a base plate 43 which in turn is pi~otally connected for rotational movement on a further plate 44. The plates 43 and 44 effectively is a turntable or fifth wheel assembly, such plates being pivotally interconnected for movement about a substantially vertical axis in any convenient manner. The lower or further plate 44 is slidably mounted on the base 33 and movable from one to another of a rearward and forward position by means of .
- 5 _ ::
, ~' ~ ' '' .: :. . . .
:L2~
one or more hydraulic cylinder units 33A. The sliding movement is provided by a pair of tracks or equivalent mechanism with friction-reducing roller elements 33B
being provided.
S The grapple 32 is a conventional grapple suspended from boom element 35 by pivot pin 60, the grapple consists of a pair of jaw members pivoted by respective ones of a pair of hydraulic cylinder units 61.
During skldding, the lower end of the grapple abuts against the for~ard face of bunk 51, transmitting skidding forces to the bun~ at a favourable position on the vehicle as disclosed in the aforementioned issued patents. Bunk 50 is pivotally mounted on the boom by a pivot pin 50A so as to be movable toward and away from the bunk 51. Pivotal movement of bunk 50 about pin 50~ is effected by way of hydraulic cylinder unit 50B. When travelling without a load, the lower end of the grapple is positively clamped between bunks 50 and 51 by actuating hydraulic cylinder 50B.
The grapple 32 has secured thereto a pair of stabilizing abutments 62 and 63, located respectively on opposite sides of the grapple and positioned for engagement with the upper surface of the bundle of trees being handled. These stabilizing units are provided for the purpose of reducing tilt of the grapple relative to the load ~hen the load is being pulled by the grapple . - .
.
7~
into a loading position on -the bunk and/or utilizing -the forces through the grapple on the load to move the vehicle from one position to another when stuck because of poor ground conditions.
Figures 2 and 3 of the drawings illus-trate the boom grapple and mounting assembly in somewhat more detail and with minor modifications thereto. The main modifications illustrated in Figures 2 and 3 relate -to the mounting 33 for slidably moving -the boom, bunk and grapple assembly longi-tudinally along the vehicle and pivoting the assembly about a vertical axis. Referring to Figure 2, the mounting assembly 33 consists of a pair of channels 70 and 71 disposed in face to face relation providing a track for plate 44 and rollers 33B attached thereto for longitudinal movement lengthwise of the vehicle. Plate 43 is pivotally attached to plate 44 and pivotal movement about the ver-tical axis and pivotal movement is effected by a pair of hydraulic cylinders 33A anchored at one end to the frame 33 which is not slidable relative to the vehicle and at the other end -to the turntable. Actuation of one or the other of the pair of cylinders will effect pivotal movement of the assembly on the base and simultaneous action of the two cylinders will cause longitudinal sliding movement of the unit relative to the vehicle.
: ,;
.~ ` .
: , ,: ', ' -
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a tree skidder of the type having a boom, grapple and bunk as a unit mounted on a motorized vehicle, the improvement comprising:
means mounting said unit on the vehicle for selected movement longitudinally therealong to selectively locate and thereby selectively distribute the load on the vehicle resulting from a bundle of trees grasped by the vehicle and being skidded thereby, and means for selectively effecting such movement.
means mounting said unit on the vehicle for selected movement longitudinally therealong to selectively locate and thereby selectively distribute the load on the vehicle resulting from a bundle of trees grasped by the vehicle and being skidded thereby, and means for selectively effecting such movement.
2. The improvement as defined in claim 1 wherein said means for affecting movement of said unit comprises power means.
3. In a tree skidder of the type having a boom, grapple and bunk as a unit mounted on a motorized vehicle, the improvement comprising:
means mounting said unit on the vehicle for selected movement longitudinally therealong to selectively locate and thereby selectively distribute the load on the vehicle resulting from a bundle of trees grasped by the vehicle and being skidded thereby; and means for selectively effecting such movement; and abutment means fixed to the frame of the grapple and extending forwardly and aft therefrom for abutting trees grasped by the grapple to stabilize the grapple on the grasp load of trees.
means mounting said unit on the vehicle for selected movement longitudinally therealong to selectively locate and thereby selectively distribute the load on the vehicle resulting from a bundle of trees grasped by the vehicle and being skidded thereby; and means for selectively effecting such movement; and abutment means fixed to the frame of the grapple and extending forwardly and aft therefrom for abutting trees grasped by the grapple to stabilize the grapple on the grasp load of trees.
4. The improvement as defined in claims 1, 2 or 3 wherein said bunk includes first and second spaced apart bunk members and wherein one of said bunk members is movable toward and away from the other selectively to clamp and release a portion of the grapple therebetween.
5. The improvement as defined in claim 4 wherein said movable bunk portion is pivotally mounted thereby and movable toward and away from the other bunk portion which is fixed to grasp the grapple therebetween to stabilize the same during travelling of the vehicle while not carrying a load.
6. A boom, grapple and bunk unit for mounting on a motorized self propelled vehicle to provide a tree skidder said boom, grapple and bunk unit comprising a mounting base, an articulated boom having a first generally L-shaped stick pivotably attached at one end to said mounting base and a second stick pivotally attached to the other end of said first stick, first power means for pivotally moving said first stick and second power means for pivotally moving said second stick, a grapple suspended from said second stick and including abutment means extending fore and aft therefrom to abut trees grasped by the grapple during skidding to stabilize the grapple on the grasp load of trees and bunk means carried by said mounting base for resting thereon stems of trees grasped by the grapple during skidding a load of trees.
7. A boom, grapple and bunk unit for mounting on a motorized self propelled vehicle to provide a tree skidder, said boom, grapple and bunk unit comprising a mounting base, an articulated boom having a first generally L-shaped stick pivotally attached at one end to said mounting base and a second stick pivotally attached to the other end of said first stick, first power means for controlling pivotally moving said first stick and second power means for pivotally moving said second stick, grapple means suspended from said second stick, and bunk means carried by said mounting base for resting thereon stems of trees grasped by the grapple during skidding a load of trees; said bunk means including first and second spaced apart bunk portions between which a tip end portion of the grapple is located during skidding and means mounting one bunk portion for movement selectively toward and away from the other bunk portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000463370A CA1261791A (en) | 1984-09-17 | 1984-09-17 | Skidder with improved boom, grapple and bunk assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000463370A CA1261791A (en) | 1984-09-17 | 1984-09-17 | Skidder with improved boom, grapple and bunk assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1261791A true CA1261791A (en) | 1989-09-26 |
Family
ID=4128730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000463370A Expired CA1261791A (en) | 1984-09-17 | 1984-09-17 | Skidder with improved boom, grapple and bunk assembly |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1261791A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112078645A (en) * | 2020-09-27 | 2020-12-15 | 江西团团圆家具有限公司 | Panel transportation auxiliary device for furniture processing |
-
1984
- 1984-09-17 CA CA000463370A patent/CA1261791A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112078645A (en) * | 2020-09-27 | 2020-12-15 | 江西团团圆家具有限公司 | Panel transportation auxiliary device for furniture processing |
| CN112078645B (en) * | 2020-09-27 | 2021-11-30 | 江西团团圆家具有限公司 | Panel transportation auxiliary device for furniture processing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |