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WO1983002589A1 - Structure arquee pivotante pour un vehicule de trainage de billes de bois - Google Patents

Structure arquee pivotante pour un vehicule de trainage de billes de bois Download PDF

Info

Publication number
WO1983002589A1
WO1983002589A1 PCT/US1982/000119 US8200119W WO8302589A1 WO 1983002589 A1 WO1983002589 A1 WO 1983002589A1 US 8200119 W US8200119 W US 8200119W WO 8302589 A1 WO8302589 A1 WO 8302589A1
Authority
WO
WIPO (PCT)
Prior art keywords
log
bunk
webs
bumper
vehicle
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.)
Ceased
Application number
PCT/US1982/000119
Other languages
English (en)
Inventor
Tractor Co. Caterpillar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to EP19820900851 priority Critical patent/EP0100311A4/fr
Priority to PCT/US1982/000119 priority patent/WO1983002589A1/fr
Priority to CA000413622A priority patent/CA1183812A/fr
Priority to ZA827940A priority patent/ZA827940B/xx
Publication of WO1983002589A1 publication Critical patent/WO1983002589A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
    • B60P3/40—Vehicles adapted to transport, to carry or to comprise special loads or objects for carrying long loads, e.g. with separate wheeled load supporting elements
    • B60P3/41—Vehicles adapted to transport, to carry or to comprise special loads or objects for carrying long loads, e.g. with separate wheeled load supporting elements for log transport
    • 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

Definitions

  • This invention relates to pivotal arch structures and, more particularly, to log bunks integral therewith which promote longitudinal log movement thereon.
  • the most feasible means for transporting harvested trees from their felling point to a collection point is by dragging those trees behind a vehicle-
  • Such log dragging is generally accomplished by either attaching logs to a log skidding vehicle with a cable or by grasping the logs with a grapple suspended from an elevated support boom carried by the vehicle chassis.
  • the logs are dragged behind the skidding vehicle, one end of each log being dragged is elevated and moved closer to the vehicle.
  • the structure separating the log ends from the vehicle's chassis, cab, main frame, etc. shield the same from impact loads exerted by the adjacent log ends.
  • Such shielding structures are known as log bunks.
  • Log handling apparatus may be advantageously positionable relative to the skidding vehicle and log load to facilitate engagement of the logs by the log handling apparatus.
  • the log handling apparatus is sometimes supported on a moveable structure called an arch.
  • Functional integration of the log bunk and moveable arch permits movement of the log bunk to a variety of positions which, when coordinated with actuation of the log handling apparatus, facilitates moving the adjacent log ends to optimum skidding positions relative to the vehicle and, at the same time, protecting vulnerable vehicle components from being impacted by the log ends.
  • Selectively positionable arches and integral log bunks
  • support members on which the logs bear and which are oriented in a lateral fashion transverse to the vehicle's longitudinal axis.
  • Such transverse orientation of the log bearing support members obstructs the skidder vehicle operator's view in varying degrees as the arch moves (usually pivoted) to its various positions. Obstruction of the operator's view is primarily due to the projected vertical separation distances between the lateral log bearing members narrowing as the arch pivots rearwardly and subtends a progressively smaller vertical projection.
  • the perceived vertical distance between such lateral log bearing supports becomes smaller and smaller from the operator's vantage point and thus makes proper positioning of the log skidding vehicle relative to the load of logs extremely difficult.
  • the elevated ends of the log tend to abutt the lateral log bearing members so as to hinder their further longitudinal movement onto the log bunk. This is especially true when the log handling apparatus constitutes a winch drawn cable.
  • a log skidding vehicle is provided with a pivotable arch structure and integral log bunk which includes longitudinally arranged bunk webs and a longitudinally adjacent bumper member arranged at one end of the bunk webs. Logs initially engaging the bumper member are deflected to subsequently engage the longitudinally arranged bunk webs which promote log movement thereon and provide increased rearward visibility for the load skidding vehicle's operator.
  • Fig. 1 is a side elevation view of an exemplary log skidding vehicle
  • Fig. 2 is a rear elevation view of the log skidding vehicle of Fig. 1;
  • Figs. 3A and 3B are partial sectional views of the skidding vehicle's arch structure taken along section line IIIA-IIIA of Fig. 2 showing two sequential positions of logs during movement of the log bunch L relative to the log bunk;
  • Fig. 4 is an enlarged elevational view of a bumper-bunk intersection portion illustrated in Figs. 3A and 3B. Best Mode for Carrying Out the Invention
  • Fig. 1 illustrates a track equipped, log skidding vehicle 10 having a longitudinal axis 11, an undercarriage 12, a chassis 13, and a chassis mounted operator station 14.
  • the chassis 13 includes a main frame 15 having rearwardly extending support ears 16.
  • An arch 18 is pivotally mounted at its proximal end P to the support ears 16 for pivotal movement between the retracted position (shown in full) and the extended position (shown in phantom) wherein the arch 18's distal end D respectively occupies a position adjacent and removed from the operator station 14.
  • One or more tensile members such as cable 20 is wrapped around a winch 21 which may be selectively driven to unwind or retract the cable 20.
  • the arch 18 is pivoted at its proximal end P about a transverse pivot axis 22 extending through the support ears 16 and the arch 18 by a pair of arch cylinders 24 (only one of which is shown) which are pivotally mounted to the vehicle's main frame 15 and to " the arch 18.
  • the arch structure 18 includes a pair of fenders 26, a fairlead 28, and a log bunk 30.
  • the log bunk 30 has a first side member 32 and a second side member 34 (both of which are longitudinally arranged) , a plurality (5 are illustrated) of longitudinally disposed, laterally separated bunk webs 36 arranged between the side members 32 and 34, a plurality (2 are illustrated) of laterally disposed, longitudinally separated support beams 38 joined to the side members 32 and 34 for preferably intersecting with and bolstering the bunk webs 36, and a bumper 40 which is arranged adjacent the proximal (nearer the pivot axis 22) ends P of the bunk webs 36.
  • the bunk webs 36 preferably include a bearing member 36a and a stiffener member 36b which cooperate to form a T-section as best illustrated in Figs. 2 and 4.
  • the bumper 40 has an axis 42 which is preferably coincidental with the pivot axis 22.
  • the bunk webs 36 has a bearing surface 36' which is preferably on the bearing member 36a and which is engageable with logs.
  • the bumper 40 includes a smooth, continuous surface 40' with which the logs are engageable.
  • the bunk webs 36 are preferably joined to the bumper 40 by welding as illustrated in Fig. 4, but need not be .for purposes of the present invention.
  • the bumper 40 preferably constitutes a member
  • the bumper 40 could constitute a roller member which is rotatably journaled about its axis 42 and is supported by the vehicle's main frame 15.
  • Each bunk web 36 has a first portion 44, a second portion 45, and a third portion 46 which are
  • bunk webs 36 respectively arranged proximally, intermediately, and distally relative to the pivotal axis 22.
  • the three portions of the bunk webs 36 reflect the shape of the vehicle so as to conform thereto as nearly as practicable when the arch 18 is in the retracted
  • each bunk web 36 - is, by example disposed at an obtuse angle of approximately
  • each bunk web 36 constitutes a tapered, transition area whose projection intersects the bumper surface 40' as previously described.
  • the support beams 38 are joined to the side members 32 and 34 and intersect with the bunk webs 36.
  • the laterally disposed support beams 38 occupy positions below the bunk webs bearing surfaces 36'. No portion of the support beams 38 intersect with (even in a tangential relationship) the bearing surface 36' of any bunk web 36.
  • the arch structure 18 is typically extended rearwardly and a suitable length of cable 20 is unreeled from the winch 21'.
  • the cable 20 and associated choker attachment(s) are then wrapped around the end of the log bunch L adjacent the vehicle 10. Subsequently, the cable 20 is retracted by the winch 21 and the attached log bunch L is drawn toward the log skidding vehicle 10.
  • the arch structure 18 is pivoted toward the vehicle 10 in a clockwise manner (as viewed in Figs. 1,- 3A, 3B, 4) about the pivot axis 22.
  • the manner of coordinating the movement of the arch 18 and cable 20 during the log loading sequence is of operator choice and is dependant upon many considerations including the underlying terrain, relative configuration of the log bunch L - vehicle 10, and log bunch size.
  • the operator's view through the arch 18 of the log bunch from the operator station 14 remains substantially unchanged due primarily to the longitudinal disposition of the bunk webs 36.
  • the arch subtends a decreasing vertical projection height (from the operator's vantage point).
  • the bunk webs 36 of the arch structure 18 obstruct substantially the same percentage of the operator's view through the arch 18 for any arcuate position of ' the arch 18. Such characteristic tends to remove operator blind spots inherently present in arch structures having laterally disposed bunk webs.
  • Fig. 3A illustrates initial engagement between a log bunch and the arch's bumper 40. It is to be understood that initial engagement of the log bunch with the log bunk 30 between the arch's proximal and distal ends P and D, respectively, may be obtained by coordinating retraction of the cable 20 and arch cylinders 24. However, for purposes of illustrating the proficiency of the present invention, initial engagement of the log bunch and the arch 18 is illustrated in one of the most adverse conditions.
  • the bumper's log engagement surface 40' has a smooth, continuous contour which is conducive to log movement in the longitudinal direction of the vehicle 10. While the bumper 40 has a circular outer periphery, it is to be understood that the bumper 40 may assume any cross sectional shape having a smooth, continous outer surface portion, (such as an oval) for promoting log slippage relative thereto. Of course such smooth, continuous surface of the bumper 40 is
  • the smooth, log engagement surface 40 * constitutes the surface portion facing generally rearwardly and upwardly as illustrated in Fig. 3A.
  • the support beams 38 being disposed beneath the bearing surfaces 36', do not interfere with longitudinal movement of the log bunch L which has often been a detriment to prior art log bunks 30 having laterally arranged bunk webs.
  • Prior art log bunks had a further disadvantage in that log ends sometimes engaged the arch intermediate its distal and proximal ends and protruded between the lateral webs when the arch was in the extended position. When the prior, art arch was subsequently retracted, the entire logs were raised typically causing the vehicle's front end to lift from the ground and reduce its load skidding capability.
  • the laterally disposed support beams 38 preferably extend through the bunk webs 36 for purposes of log bunk compactness, it is to be understood that such support beams 38 may pass under the bunk webs 36 relative to the vantage point of Figs. 1, 2, 3A and. 3B.
  • the support beams 38 in addition to bolstering the bunk webs 36, add rigidity to the log bunk 30 and help maintain the lateral spacing between the bunk webs 36.
  • the bumper 40 while perferably not connected to the side members 32 and 34, is preferably joined to the bunk webs 36 so as to provide rigidity and maintain the lateral spacing o the proximal ends P of the bunk webs 36.
  • the bearing surface 36' of the bunk webs 36 intersect generally tangentially with the log engag ent surface 40' of bumper 40 so as to provide a smooth transition therebetween.
  • the only criteria that need be satisfied is that such surfaces or projections thereof do, in fact, intersect the bumper's log engagement surface 40'. If, for example, higher hypothetical bearing surfaces 36' ' ' (as illustrated in phantom in Fig. 4 above the bumper engagement surface 40*) were utilized, a log bunch L would tend to catch the proximal edge P of the bunk webs 36, hang up, and thus obstruct further log movement onto the bearing surfaces 36'' 1 .
  • the axis 42 of the bumper 40 is preferably coincidental with the pivot axis 22 as illustrated, it is to be understood that the proximal end P of the arch 18 (and integral log bunk 30) may extend beyond the pivot axis 22.
  • Such arch structure would provide certain advantages but, at the same time, would include certain disadvantages such as potential interference between the proximal end P of the arch 18 and the vehicle chassis 13 during counterclockwise pivoting (extension) of the arch 18.
  • Such arch structure is, however, also considered within the scope of the present invention.
  • the instant arch structure 18 could be used with equal facility with a grapple instead of the illustrated fairlead 28 and cable 20.
  • the arch structure 18 due to the cooperative orientation of the bumper 40, bunk webs 36 and support beams 38, presents a compact, rigid, and readily manipulatable structure which maximizes productivity of the log skidding vehicle 10 by providing substantially constant operator visibility therethrough for any arch position and promoting longitudinal log movement therealong to facilitate loading and unloading thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Environmental Sciences (AREA)
  • Bridges Or Land Bridges (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

Une structure arquée pivotante (18) ayant un logement solidaire (30) pour les billes peut pivoter à une extrémité (P) par rapport à une structure principale (15). Le logement des billes (30) comprend plusieurs joues de logement longitudinales (36) qui sont soutenues par des poutres de support latérales (38) reliées aux joues. Un buttoir (40) est disposé adjacent à l'extrémité des joues (36) à proximité de l'axe de pivot (22). La disposition longitudinale des joues de logement (36) améliore le déplacement longitudinal des billes tandis que le buttoir (40) guide les billes dans une direction facilitant leur engagement ultérieur avec les joues de logement (36). Les joues de logement longitudinales (36) offrent également une bonne visibilité à l'opérateur, la structure arquée (18) pouvant prendre plusieurs positions de pivotement.
PCT/US1982/000119 1982-01-29 1982-01-29 Structure arquee pivotante pour un vehicule de trainage de billes de bois Ceased WO1983002589A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19820900851 EP0100311A4 (fr) 1982-01-29 1982-01-29 Structure arquee pivotante pour un vehicule de trainage de billes de bois.
PCT/US1982/000119 WO1983002589A1 (fr) 1982-01-29 1982-01-29 Structure arquee pivotante pour un vehicule de trainage de billes de bois
CA000413622A CA1183812A (fr) 1982-01-29 1982-10-18 Arceau orientable pour vehicule debardeur
ZA827940A ZA827940B (en) 1982-01-29 1982-10-29 Log skidding vehicle's pivotable arch structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1982/000119 WO1983002589A1 (fr) 1982-01-29 1982-01-29 Structure arquee pivotante pour un vehicule de trainage de billes de bois

Publications (1)

Publication Number Publication Date
WO1983002589A1 true WO1983002589A1 (fr) 1983-08-04

Family

ID=22167788

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1982/000119 Ceased WO1983002589A1 (fr) 1982-01-29 1982-01-29 Structure arquee pivotante pour un vehicule de trainage de billes de bois

Country Status (4)

Country Link
EP (1) EP0100311A4 (fr)
CA (1) CA1183812A (fr)
WO (1) WO1983002589A1 (fr)
ZA (1) ZA827940B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009050563A3 (fr) * 2007-10-18 2009-06-04 Redlex 278 Pty Ltd T A Afriwel Débusqueuse forestière

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1987688A (en) * 1931-12-11 1935-01-15 Frank H Lamb Logging tractor
US3841507A (en) * 1973-03-29 1974-10-15 R Barwise Load handling apparatus
US4278391A (en) * 1979-03-02 1981-07-14 Dagenais Joseph E Protection means for tracks in a track-laying vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1987688A (en) * 1931-12-11 1935-01-15 Frank H Lamb Logging tractor
US3841507A (en) * 1973-03-29 1974-10-15 R Barwise Load handling apparatus
US4278391A (en) * 1979-03-02 1981-07-14 Dagenais Joseph E Protection means for tracks in a track-laying vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0100311A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009050563A3 (fr) * 2007-10-18 2009-06-04 Redlex 278 Pty Ltd T A Afriwel Débusqueuse forestière

Also Published As

Publication number Publication date
EP0100311A1 (fr) 1984-02-15
EP0100311A4 (fr) 1984-05-29
ZA827940B (en) 1983-08-31
CA1183812A (fr) 1985-03-12

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