CA1167083A - Self aligning truck trailer - Google Patents
Self aligning truck trailerInfo
- Publication number
- CA1167083A CA1167083A CA000359045A CA359045A CA1167083A CA 1167083 A CA1167083 A CA 1167083A CA 000359045 A CA000359045 A CA 000359045A CA 359045 A CA359045 A CA 359045A CA 1167083 A CA1167083 A CA 1167083A
- Authority
- CA
- Canada
- Prior art keywords
- trailer
- link
- bunk
- connector
- tractor
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D13/00—Steering specially adapted for trailers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Body Structure For Vehicles (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Chambers 1 c+us/w SELF ALIGNING TRUCK TRAILER
ABSTRACT OF THE DISCLOSURE
Trailer and trailer connector for tractor/
trailer for carrying elongated, self-supporting load.
Tractor has conventional swivellable front bunk for supporting front of load, and trailer has a wheeled rear bogey and a non-swivelling rear bunk for rear of load. The trailer connector has a flexible link and a forward connection which connects forward end of link to front bunk and a rear connection which con-nects rear end of the link to the trailer. Length of the link does not change while towing the trailer and thus maintains tractor/trailer wheel alignment prior to loading. Trailer connector is consider-ably lighter than conventional telescopic trailer reaches, thus increasing maximum payload of tractor/
trailer, and is Less costly and easier to maintain than trailer reach, and also provides a more stable load platform.
ABSTRACT OF THE DISCLOSURE
Trailer and trailer connector for tractor/
trailer for carrying elongated, self-supporting load.
Tractor has conventional swivellable front bunk for supporting front of load, and trailer has a wheeled rear bogey and a non-swivelling rear bunk for rear of load. The trailer connector has a flexible link and a forward connection which connects forward end of link to front bunk and a rear connection which con-nects rear end of the link to the trailer. Length of the link does not change while towing the trailer and thus maintains tractor/trailer wheel alignment prior to loading. Trailer connector is consider-ably lighter than conventional telescopic trailer reaches, thus increasing maximum payload of tractor/
trailer, and is Less costly and easier to maintain than trailer reach, and also provides a more stable load platform.
Description
-- I t67083 (1) BACKGROUND OF THE INVENTION
Field of the Invention The invention relates to a trailer con-nector and trailer for use in a truck and trailer combination for carrying elongated self-supporting loads, in particular to logging trucks and the like.
Prior Art Truck and trailer combinations for carry-ing elongated sel-supporting loads have been used for many years, particularly as logging trucks. In the past, logging trucks were used extensively on narrow and winding logging roads and, because the bends in such roads were often relatively tight, it was essential that the rear wheels of the trailer follo~ed closely the tracking arc of the front wheels of the tractor when negotiating the bends.
Modern logging trucks use a telescopic trailer reach or compensator that extends rigidly forwardly from the trailer and is hinged to a hitch disposed rearwardly of the truck bunk. The truck bunk and ,. ,~.
,, .
1 ~ 6~
Field of the Invention The invention relates to a trailer con-nector and trailer for use in a truck and trailer combination for carrying elongated self-supporting loads, in particular to logging trucks and the like.
Prior Art Truck and trailer combinations for carry-ing elongated sel-supporting loads have been used for many years, particularly as logging trucks. In the past, logging trucks were used extensively on narrow and winding logging roads and, because the bends in such roads were often relatively tight, it was essential that the rear wheels of the trailer follo~ed closely the tracking arc of the front wheels of the tractor when negotiating the bends.
Modern logging trucks use a telescopic trailer reach or compensator that extends rigidly forwardly from the trailer and is hinged to a hitch disposed rearwardly of the truck bunk. The truck bunk and ,. ,~.
,, .
1 ~ 6~
(2) trailer bunk are both swivelling bunks and thus tend to be somewhat unstable when the truck travels at high speeds on the highway, The reach carries negligible tensile loads when the logging truck is loaded and serves mainly to force the rear wheels of the trailer into an arc that appro~imates to the front wheels of the trac~or as the truck negotiates a curve. ~owadays logging roads have been improv~d considerably, ie. widened and straightened, and commonly semi-trailers or flatbed trailers can use the main logging roads without much difficulty.
Consequently, trailer reaches as commonly used for rear wheel tracking purposes are often not required, Because trailer reaches are relatively heavy components, ie. about three thousand to ~our thousand pounds, they detract from payload of the truck, It is well known to use a rear trailer to support a rear end of a self-supporting load with no connection between the rear trailer and tractor apart from braking and electri.cal service conduits.
A "non-connected" trailer of this general type is used on modern highways to transport excessively long rigid loads, such as beams for bridges, build-ings, etc, When the load is loaded onto thetractor and trailer, considerable care must be I 1 670~3
Consequently, trailer reaches as commonly used for rear wheel tracking purposes are often not required, Because trailer reaches are relatively heavy components, ie. about three thousand to ~our thousand pounds, they detract from payload of the truck, It is well known to use a rear trailer to support a rear end of a self-supporting load with no connection between the rear trailer and tractor apart from braking and electri.cal service conduits.
A "non-connected" trailer of this general type is used on modern highways to transport excessively long rigid loads, such as beams for bridges, build-ings, etc, When the load is loaded onto thetractor and trailer, considerable care must be I 1 670~3
(3) exercised to ensure that the wheel axles of the trailer are disposed normally to the central axis of the tractor and trailer combination to ensure accurate tracking of the rear wheels of the com-bination.
Commonly, when loading this "non-connected"
type of tractor/trailer combination, several hours might be required to adjust the relative disposi-tion o~ the rear trailer by lateral shifting and swivelling to ensure accurate wheel alignment.
Whilst such loading time might be acceptable for transporting special loads where transportation costs are not a major consideration, in the logging industry where short turn around times are essen-tial for econoMical operation, such excessive ~oading tlme would be uneconomic, A common logging truck with a telescopic reach can be loaded within minutes with no difficulty in maintaining wheel alignment, and thus, prospective competitive arrangements should be equally quick to load.
SUMMARY OF THE INVENTION
The invention reduces disadvantages of 1 ~ 670~3
Commonly, when loading this "non-connected"
type of tractor/trailer combination, several hours might be required to adjust the relative disposi-tion o~ the rear trailer by lateral shifting and swivelling to ensure accurate wheel alignment.
Whilst such loading time might be acceptable for transporting special loads where transportation costs are not a major consideration, in the logging industry where short turn around times are essen-tial for econoMical operation, such excessive ~oading tlme would be uneconomic, A common logging truck with a telescopic reach can be loaded within minutes with no difficulty in maintaining wheel alignment, and thus, prospective competitive arrangements should be equally quick to load.
SUMMARY OF THE INVENTION
The invention reduces disadvantages of 1 ~ 670~3
(4) the prior art by providing a trailer connector and tractor for use in a tractor and trailer combina-tion in which there is no rigid connection between the tractor and trailer. The trailer connector is S required only for initial trailer wheel alignment prior to loading and because, when the combination is loaded, the load itself,transmits towing and turning forces. Thus the trailer connector can be flexible and relatively lightweight as it carries negligible loads when the combination is loaded, The reduction in weight of the trailer connector and thus the combination permits a considerable increase in permissible load carrying capacity of the tractor and tràiler combination, and also simplifies main-tenance because negligible loads are imposed on thetrailer connector for most operations of the truck, A trailer connector according to the invention is for use in a tractor and trailer combination for carrying an elongated, self-sup-porting load. The tractor has a swivellable front bunk mounted for pivotting about a pivot axis and is adapted to retain a front portion of the load thereon. The trailer has a rear bogey having at least one pair of road bearing wheels and a non-t ~ 67083
(5) swivelling rear bunk mounted on the bogey andadapted to retain a rear portion of the load thereon.
The trailer connector is further char-acterized by flexible link means, a forward connection means for connecting a forward end portion of the flexible link means to the swivel- -lable front bunk, and a rear connection means for connecting a rear end portion of the link means to the trailer. The link means and connection means are arranged so that when the trailer is unloaded and pulled by the tractor over a sub-stantially level surface, a longitudinal central axis of the trailer is aligned with the pivot axis of the swivellable front bunk, A method of the invention utilizing structure as above described is characterized by providing a flexible link and connecting a forward end thereof to the swivellable front bunk .and a rear end thereof to the trailer. The trac-tor is moved forwardly while towing the trailer through said flexible link until a central axis of the trailer is aligned with the pivot axis
The trailer connector is further char-acterized by flexible link means, a forward connection means for connecting a forward end portion of the flexible link means to the swivel- -lable front bunk, and a rear connection means for connecting a rear end portion of the link means to the trailer. The link means and connection means are arranged so that when the trailer is unloaded and pulled by the tractor over a sub-stantially level surface, a longitudinal central axis of the trailer is aligned with the pivot axis of the swivellable front bunk, A method of the invention utilizing structure as above described is characterized by providing a flexible link and connecting a forward end thereof to the swivellable front bunk .and a rear end thereof to the trailer. The trac-tor is moved forwardly while towing the trailer through said flexible link until a central axis of the trailer is aligned with the pivot axis
(6) of the swivellable front bunk. A self-supporting load is placed on the front and rear bunks and the front and rear portions of the load are securely fastened to the front and rear bunks.
A detailed disclosure following, related to drawings, describes preferred embodiments of the invention which is capable of expression in 1~ structure other than that particularly described and illustrated.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a simplified diagrammatic side eleva-tion of a tractor and trailer combination using one embodiment o a trailer connect-or according to the inventlon, Fig. 2 is a simplified diagrammatic top plan of the embodiment of Fig. 1,
A detailed disclosure following, related to drawings, describes preferred embodiments of the invention which is capable of expression in 1~ structure other than that particularly described and illustrated.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a simplified diagrammatic side eleva-tion of a tractor and trailer combination using one embodiment o a trailer connect-or according to the inventlon, Fig. 2 is a simplified diagrammatic top plan of the embodiment of Fig. 1,
(7) Fig. 3 is a simplified rear elevation of the trailer of Fig. l, Fig. 4 is a simplified fragmented top plan of a central portion of the trailer connector of Fig, 1, Fig. 5 is a simplified fragmented side elevation of the central portion of the trailer connector shown in Fig~ 4, Fig, 6 is a simplified fragmented top plan of a rear portion of the trailer connector of Fig. 1, Fig. 7 is a simplified fragmented side elevation of the rear portion of the trailer connect-or shown in Fig. 6, 0 Fig. 8 is a simplified fragmented section on line 8-8 of Fig. 2 showing stabili~ing link anchoring means, Fi8~ 9 is a simplified diagrammatic top plcln of ``~ 7~3
(8) a second embodiment of a trailer and trailer connector, Fig. lO (which appears on the same page as Fig, 3) is a simplified fragmented side elevation of the alternative trailer and a portion of the trailer connector of Fig. 9, Fig. ll (which appears on the same page as Fig. 3) is a simplified fragmented side elevation of a trailer similar to the trailer of Fig. 1 showing an alternative stabilizing link anchoring means, Fig. 12 is a simplified diagrammatic side eleva-tion of a third embodiment of a trailer connector according to the invention, Fig. 13 is a simplified diagrammatic top plan of a third embodiment of Fig. 12, Fig. 14 (which appears on the same page as Fig. 3) is a simplified diagrammatic top plan of a fourth embodiment of a trailer connect-or using the trailer of Figs. 9 and 10, Fig. 15 (which appea~s on the same page as Fig. 3) is a simplified diagrammatic top plan of a tractor and douhle trailer combination utilizing the first embodiment of the , , I ~ 670~3
(9) trailer connector of Figs. i through 3.
DETAILED DISCLOSURE
Fi~s. 1 through 3 A tractor and trailer com~ination 10 according to the invention has an essentially conventional tractor 11 and a modified trailer 12, the trailer being connected to the tractor by a trailer connector 14 according to the invention.
The tractor is a typical prior art logging truck tractor having a swivellable front bunk 17 mounted for pivottlng about a vertical pivot axis 18 ~ disposed over a set of rear wheels 20 mounte~d on - twin or tandem axles. The traller 12 has a simi-lar set of tandem wheels 22 mounted on a trailer frame 24 and is termed a rear bogey, the frame carrying a non-swivelling rear bunk 26 mounted on the bogey. The front and rear bunks have pairs of spaced stakes 29 and 30 respectively to support a load of logs 32, broken outline, extending therebetween, The stakes and bunks are generally similar to the prior art except that the rear bunk is mounted rigidly, that is non-swivellably on the 1 3 67~3
DETAILED DISCLOSURE
Fi~s. 1 through 3 A tractor and trailer com~ination 10 according to the invention has an essentially conventional tractor 11 and a modified trailer 12, the trailer being connected to the tractor by a trailer connector 14 according to the invention.
The tractor is a typical prior art logging truck tractor having a swivellable front bunk 17 mounted for pivottlng about a vertical pivot axis 18 ~ disposed over a set of rear wheels 20 mounte~d on - twin or tandem axles. The traller 12 has a simi-lar set of tandem wheels 22 mounted on a trailer frame 24 and is termed a rear bogey, the frame carrying a non-swivelling rear bunk 26 mounted on the bogey. The front and rear bunks have pairs of spaced stakes 29 and 30 respectively to support a load of logs 32, broken outline, extending therebetween, The stakes and bunks are generally similar to the prior art except that the rear bunk is mounted rigidly, that is non-swivellably on the 1 3 67~3
(10) rear trailer for reasons to be explained, and thus contrasts with the swivelling rear bunk on common trailers. Loads other than logs can be carried between the bunks, such as,concrete or steel beams, etc., p~ovided the load is eloMgated and self-sup-porting so as to permit supporting of the load at positions adjacent either end so that the ~ront and rear portions of the load are retained on the front and rear bunks respectively.
The trailer has a walking beam 35 carrying trailer axles for pairs of the wheels 22 spaced longitudinally at opposite ends of the beam on each side of the trailer. The beam is hinged to'a lower portion of the frame so as to pivot about a transverse beam axis 37 disposed ; parallel to the trailer axles as is weLl known in the prior art. As illustrated, the walking beam thus provides a simple and rugged suspension for . 20 the rear traiLer and is similar to that commonly used on logging trucks, The walking beam 35 is thus a longitudinal suspension means extending between the wheels, and the frame is hinged to the suspension means for longitudinal rocking movement in a forward and rearwards manner rela-tive to the wheelsO
`` I 1 670~3
The trailer has a walking beam 35 carrying trailer axles for pairs of the wheels 22 spaced longitudinally at opposite ends of the beam on each side of the trailer. The beam is hinged to'a lower portion of the frame so as to pivot about a transverse beam axis 37 disposed ; parallel to the trailer axles as is weLl known in the prior art. As illustrated, the walking beam thus provides a simple and rugged suspension for . 20 the rear traiLer and is similar to that commonly used on logging trucks, The walking beam 35 is thus a longitudinal suspension means extending between the wheels, and the frame is hinged to the suspension means for longitudinal rocking movement in a forward and rearwards manner rela-tive to the wheelsO
`` I 1 670~3
(11) The trailer connector 14 has right hand and left hand forward link portions 41 and 42 extending rearwardly from cable anchors 39 at opposite ends of the front bunk 17 to a loop S connector 44 disposed approximately midway bet-ween the front and rear bunks, ie. generally adja-cent a central portion of the connector 14. The connector 14 also has right hand and left hand rear link portions 47 and 48 extending forwardly from cable anchors 49 at laterally spaced posi-tior~s on the trailer 12 to connect similarly a~
the loop connector 44. A stabilizing link 51 extends from a forward end at the loop connector to a rear end secured to a cable anchor 55 on the 15' frame 24, The stabilizing link 51 passes around a pulley 53 mounted on a portion of the trailer spaced beneath a straight line 57 extending bet-ween rear connections of the rear link portions with the trailer, as will be described with ref-erence to Fig. 8, Without the stabilizing linkwhen the trailer is unloaded it would otherwise be free to rock longitudinally about the beam axis 37, Therefore, the stabilizing link 51 is required in cooperation with the link portions 47' and 48 to provide three spaced suppor~s to prevent uncontrolled rocking of the trailer frame I ~ 67083 ~12) 24 relative to the wheels 22. It can be seen that the loop connector 44 is 3 in fact, a joining means to join the forward link portions to the rear link portions and also the stabilizing link to the forward and rear link portions, and in some circumstances can be eliminated, or equiva-lents can be substituted, as will be described.
The link portions 41, 42, 47 and 48 and the stabilizing link 51 are all suitably flexible steel cable of a diametcr of between 0.5 cm. and 2 cm. and thus have sufficient strength to hold the rear trailer when unloaded and yet resist any tendency to form permanent kinks resulting from excessive non-elastic bend-ing of the cable. If a length of cable becomes damaged, for example by a truck running over the cable such that the cable does not straighten under light loads, it should he discarded other-wise it will shorten effective length of thecable. The trailer connector 14 is used primar-ily to align the axles of the trailer with the rear axles of the tractor prior to loading logs onto the bunks.
The front and rear link portions, the I ~ G70(~3 (13) stabilizing link and loop connector 44 are all disposed symmetrically about a central longitudi-nal axis 59 of the combination 10, and thus it can be seen t~at the trailer connector 14 is a connector Link means extending symmetrically about the central longitudinal axis between at least two laterally spaced positions on the front bunk and at least two laterally spaced positions on the trailer.
The rear bunk 26 has a transversely extending row of teeth or serrations 62 extending between the stakes 30, and front and rear portions of the trailer frame 24 have similar sets of teeth or serrations 64 and 65 respectively dis-posed so aY to be at a similar height to the teeth 62. Tie down cables 63 draw the logs onto the teeth 62, 64 and 65 to augment restraint o~
rear ends of the logs on the trailer due to dead weight of the log. Clearly, if a load other than logs were to be carried, the teeth or serrations 62, 64 and 65 would be modified to be appropriate for the load. In any event, means to reduce a tendency of the load to shift relative to the rear trailer is provided so as to maintain alignment of the trailer axle or axles relative to line of ~ . , I ~ ~7033 travel of the combination, that is the trailer axle sl~ould at all times be disposed normally to and symmetrically of the longitudinal axis 59.
Pintle and gudgeon means 66 or equivalents there-of are fitted at a rear end of the tractor 11 and at a for-ward end of the trailer 12 for towing the trailer behind the tractor when unloaded. This is an alternative to the common "piggybackl' method of carrying an unloaded logging trailer, although "piggyback" carrying is easy with this invention because trailer service conduits do not require disconnection~
Figs. 4 and 5 The loop connector 44 is an annulus adapted to receive eyes fitted to ends of the cables repre-senting the forward link portions 41 and 42 ~ the rear link portions 47 and 48, and the stabilizing link portion 51. Referring to Fig 5, the left hand forward and rear link portions 42 and 48 have res-pective eyes 6~ and 69 forrned at ends of the respec-tive link portions and secured by c~lindrical ferrules 71 and 72 respectively. Openings of the eyes can be reinforced with bushings (not shown) if desired, to prevent excessive wear of the cables on the loop connector 44r As seen in Fig. 4, the connector 44 is formed from two semi-circular half portions 73 6~0~3 , (15) and 74 connected together by nut and bolt means 75 to permit easy connection and disconnection of the link portions, thus serving as a releasable cable connecting means, Opposite ends of all the link portions are similarly provided with eyes secured by ferrules, as shown in Fig. 5, Other means to permit easy connection and disconnection of link portions can be substi~uted.
Figs. 6 and 7 The cable anchor 39 for one link portion is as follows. A rear end of the left hand link portion 48 is connected to a portion of the trailer spaced from the longitudinal axis 59, as shownO The link portion 48 has an eye 76 secured by a ferrule 77 in a manner similar to that previously Jescrlbed~ A
portion of the traller frame 24 is shown and has a bracket 79 extending from a corner somewhat forward of the wheels 22, a portion of one wheel being shown.
An eye bolt 80 has an eye 81 at a forward end thereof and a threaded shank 82 received in a clearance open-ing passing through the bracket 79. The clearance opening in the bracket permits the bolt 80 to align itself with the link portion 48, thus reducing ~r eliminating bending loads on the bolt 80. Nut and t - washer means 83 and ~4 are fitted on opposite sides .. . .. .. .
I l ~70S3 - (16) of the bracket 79 and it can be seen that by loosen-ing one nut and tightening the other nut, the eye bolt 80 can be moved longitudinally according to an arrow 85. This provides a fine adjustment for length of the link portion 48, as well as provid-ing an economical and simple means of securing the link portion to the trailer.
, Forward ends of the forward link portions 41 and 42, see Fig, 2, can be similarly secured to the anchors 39 at opposite ends of the front bunk 17 with similar bracket, eye bolt and nut and washer means to provide similar accurate adjustment of length of the forward link portions also. The stabilizing link portion 51 has a rear end simi-larly connected to the trailer, but the associated bracket extends from the trailer adjacent the longitudinal axis 59. Thus effective length of each of the link portions can be adjusted accur-, ately an adequate amount to permit accurate loca-tion of the loop connector 44 relative to the axis 59 of the combination 10. Clearly, prior to use, an accurate ali~nment of the trailer axles with the tractor axles is required. This align-ment is accomplished with the combination parkedon smooth level ground and the rear trailer is ~ l 670~3 (17) manually positioned in the approximate location rearwardly of the tractor. Conventional alignment measurements are taken and the nut and bolt means are adjusted to provide fine adjustment of the cable length following, in general, normal align-ment practice in maintenance yards.
Figo 8 The trailer frame 24 is shown broken and diagrammatically to illustrate the effect of the stabilizing link portion 51 and the pulley 53 relative to the beam axis 37. Without the res-traint of the load and the link portions 47, 48 and 51 on the rear trailer, the frame and bunk would be free to rock longitudinally about the beam axis 37 which serves as a transverse rocker axis for the trailer, This is termed a "rocking"
trailer. With no load on the trailer 12, tension in the link portions 47 and 48 would apply a turn-ing moment on the frame 24 about the axis 37 in direction of an arrow 87 ~ and tension in the stab-ilizing link portion 51 through the pulley 53 and cable anchor 55 applies a turning moment in an opposite direction in accordance with an arrow 88 It can be seen that, by fine adjustment of the 7~$3 (18) length of the appropriate link portions, and thus resulting tension, the frame 24 can be stabilized against the rocking tendency that would otherwise occur prior to loading.
s In summary, the pulley 53 is positioned within a central plane containing the longitudinal a~is 59 (Fig.
2 only) and is spaced beneath the straight line 57 ex-tending between the rear connections of the link portions, The stabilizing link passes downwardly and rearwardly beneath the pulley 53 and then upwardly to the rear connection at the anchor 55 positioned within the central plane and disposed rearwardly of the pulley, Thus, the pulley and position of the rear anchor serve as counteract-ing means 89 on the trailer cooperating with the stabilizing link portion 51 to counteract a turn ing moment applied by the rear link portions to the trailer, It can be seen that the actual loca-tion of the pulley 53 and the anchor 55 is notcrltical provided there is sufficient vertical spacing between the rear connections of the rear link portions and the pulley, although the pulley is not required to be positioned directly verti-cally beneath the straight line 57 connecting thetwo cable anchors 49, Also, it is not necessary ~ 1 6~0~
(19) ~hat the anchor 55 is aligned horizontally with the rear link portions as shown. Optimum position of the pulley 53 and anchor 55 would be dependent on geometry of the rear trailer, in particular the location of the beam axis 37 and moment arm of force from the rear link portions relative to the beam axis.
OPERATIoN
The trailer connector 14 according to the invention permits easy alignment o the trailer axle prlor to loading logs onto the bunks, assum-ing that there has been accurate adjustment oflink portion lengths as previously described.
After the alignment, the connector 14 serves little purpose apart from that of a redundant safety connection between the trailer and the tractor, and also for providing support for electrical, pneumatic and hydraulic service conduits, not show shown, extending between the tractor and trailer.
At a log loading station, the tractor Z5 and trailer are positioned under the log loader, not shown, and all that is required is that the (20) wheels 22 of the trailer run initially on rela-~ively smooth and level ground so as to reduce any tendency of the ~railer wheels to move assymmetri-cally as the tractor moves forwardly. The ~ractor moves forwardly for a few Eeet so that the link portions 41, 42, 47, 4& and 51 become taut, at which time the rear bunk 26 will be essentially parallel to the front bunk 17. This is performed slowly so that as the brakes are applied, the wheels of the trailer are braked evenly and slowly so that the bunks remain parallel when both the tractor an~ trailer stop, thus maintain-ing approximately equal tautness in all the links.
If the trailer has independent braking 5 it may be advantageous to brake the trailer somewhat before the tractor so as to assist in maintaining taut-ness of the cables. The brakes are now set on both the tractor and trailer and placement o~
wheel chocks at the trailer wheels may be advan-tageous to prevent undesirable shifting. Alter-natively, particularly on slippery or slightly sloping ground, in a non~illustrated alternative, a cable can be connected between a rear of the trailer and a winch or other type of towing vehicle, such as a skidder, and the trailer can ~ 1 670~3 (21) then be pulled sufficiently away from the tractor to tauten the link portions to permit accurate length adjustment thereofO
The tractor and trailer combination is now ready to accept logs which can be loaded bet-ween the front and rear bunks in a normal manner.
When loaded, the logs are retained with the tie down cables 63 as required and longitudinal move-ment of the logs is reduced or eliminated by the serrations which is the normal practice with log-ging trucks.
It can be seen that this approach to alignment ~f tractor wheels is considerably quicker and simpler than in the prior art where the "unconnected" trailer is "manually" posi-tioned accurately each time ~he combination is loaded. With this invention, the trailer is pogitioned accurately "manually" once only when the link portions are adjusted, after which the alignment i8 e~ected automatically by the link portions.
.
6~83 (22) It can be seen that the method according to the invention is characterized by providing a flexible link means and connecting one end of the flexible link means to the swivellable front bunk and an opposite end thereof to the trailer. The tractor is moved forward whilst towing the trailer through the link means until a longitudinal cen-tral axis of the trailer, which is undesignated but coincident with the axis 59, is accurately aligned with the pivot axis of the swivellable front bunkO The self-supporting load is placed on the front and rear bunks and the front and rear portions of the load are securely fastened to the front and rear bunks.
ALTERNATIVES AND EQUIVALENTS
Fi~s. 9 and 10 A second embodiment of a trailer 91 has a trailer bunk 93 having spaced stakes 94 which 3 ~70~3 2 3) are similar to those previously described. The trailer 91 has a trailer frame 96 mounting a con-ventional tandem axle trailer suspension 9~ uti-lizing sets of resilient springs 99. The frame 96 and suspension is such that there is a negli-gible rocking tendency between the wheels and the frame and thus is termed a "non-rocking" trailer.
With a non-rocking trailer, the stabilizing link 51 of the connector 14 of Figso 1 through 8 can be eliminated. This provides a simpler alterna-tive second embodiment of a trailer connector, designated 101, which is limited for use on trailers having a suspension and frame such that there is negligible rocking therebetween, apart from that occuring with normal suspension ~eflec-tion.
The trailer connector 101 lncludes right hand and left hand forward link portions 103 and 104 connected to a swivellable front bunk 100 on the tractor, not shown, and right hand and left hand rear link portions 105 and 106 connected to 1 1 6~083 (24) the trailer 91. An intermediate link portion 108has forward and rear loop connectors 109 and 110 at forward and rear ends thereof. The forward link portions are connected to the forward loop connector, and the rear link portions are connected to the rear loop connector. Ends of the link portions are provided with eyes that cooperate with the loop connectors, and with ring bolts (not shown) mounted in brackets carried on the trailer 91 and the forward bunk in a manner simi-lar to that previously described with reference to Figs. 5 through 7.
It can be seen that the intermediate link portion 10~ extends along a central axis 111 of the combination so as to provide a symmetrical arrangement. A particular advantage for use of an intermediate link portion is that a turnbuckle, not shown, or equivalent length adjustment means can be provided to cooperate with the intermediate link to permit easy length adjustment without adjusting the eye bolts associated with the trailer or front bunk. This prevents a possible loss of alignment that mi~ht otherwise occur if the ring 1 1 670~3 (25) bolts were adjusted. Alternatively, intermediate links of different lengths could be fitted between the loop connectors to accomodate loads of widely differing lengths. The intermediate link also serves as a joining means to join the forward link portions to the rear link portions.
Clearly, if desired, the trailer connector 101 could be provided with a stabilizing link por-tion extending between the rear loop connector llOand the trailer in a manner similar to ~he link portion 51 of Figs. 1 through 3, and this would then permit use of a "rocking" trailer in which the frame thereof could rock relative to the sus-pension similarly to the trailer 12.
Fig. 11 An alternative "rocking" trailer 113 is generally similar to the trailer 12 of Figs. 1through 8, but differs by elimination of the pulley 53 and by substituting an upwardly curved walking beam 114 for the beam 35. The beam 114 is journalled on a trailer frame 115 for rocking about a rocker axis or beam a~is 116, as previous-ly described. An alternative means to counteract ~70~3 (26) a rocking tendency of the alternative rocking trailer includes a downwards extension 117 extend-ing from a portion of the frame 115 to a cable anchor 118 which is disposed within a central plane containing a central longitudinal axis, neither of which are shown, and below and forwardly of the rocker axis 116. The anchor 118 is con-nected to a rear end of the stabilizing link por-tion 51 which is thus positioned forwardly of and below the rocker axis and within the cen~ral plane.
The rear link portions 47 and 48 (of Figs. 1 through 8) have rear connections or anchors positioned above the rocker axis and apply a turning moment to the frame about the axis 116 in direction of an arrow 112. The stabilizing link portion 51 applies an cpposite turning molnent to the frame in direction of an arrow 119. Thus it can be seen that by accurate adjustment of the appropriate link lengths, the trailer can be stabilized against excessive rocking. It can be seen that the down-wards extension 117 and the location of the cable anchor 118 cooperating with the stabilizing link portion is thus equivalent to the pulley 53 and cable anchor 55 of Fig. 1, and thus serve as counteracting means on the trailer cooperating with the stabilizing link to counteract a turning ~ ~ 6~S3 (27) moment applied by the rear link portions to the trailer.
Figs. 12 and 13 A third embodiment of a trailer connector, designated 120, is shown for use with a trailer 122 which is generally similar to the trailer 91 of Figs. 9 and 10, ie, a non-rocking trailer. How-ever, as described with reference to Figs. 9 and10, if a stabilizing link portion or equivalent were fitted, with suitable modification, the trailer connector 120 could be used with the rock- ' ing trailer 12 of Figs. 1 through 3. A tractor, not shown, has a ront bunk 126 having spaced stakes 127 and is mounted for pivotting about an axis 128, The trailer connector 120 :includes a single flexible cable serving as a main flexible tension link portion 130 having a forward end 131 secured centrally of the bunk and a rear end 132 secured centrall,y of,the trailer, The front bunk has a forward alignment frame 134 extending rear-wardly therefrom, the frame having a front eye135 to accept the cable of the portion 130. The ~ ~ 67~3 (28) frame 134 has right hand and left hand struts 136 and 137 respectively extending from positions spaced equally from the axis 12& to provide a support for the eye 135 that resists sideways and vertical deflections. It can be seen that the alignment frame swings about the pivot axis 128 as the front bunk 126 swivels about the axis. The trailer has a rear alignment frame 138 extending rigidly and forwardly from the trailer, the frame 13~ being similar to the frame 134 and having a rear eye 139 therein to accept the link portion 130.
The frames 134 and 13~ are forward and rear alignment means provided on the front bunk and trailer respectively. The frames are disposed symmetrically about a central longitudinal axis 125 and function in a manner similar to the right hand and left hand forward and rear link portions o the embodiments shown in Figs. 1 through 3 and Figs, 9 and 10, An alterna~ive structure using the align-ment frames as above described could secure forward and rear ends of the portion 130 directly to the alignment frames themselves, thus eliminating ~he - I 1 6~083 (29) direct connection of the link portion to the front bunk and trailer. The alternative frames would thus carry tensile forces also, and would likely have to be stronger than the ~rames that merely provide guiding eyes for the cable. Both of these structures could utilize a flexible tension link, preferably a cable, although a link chain could be used in some circumstances. It would be expected that the trailer using the rigid align-ment frames as above described would have aslower response for alignment than the cable con-nectors of Figs. 1 through 3 and Figs. 9 and 10.
Fi~. 14 A fourth embodiment of a trailer con-nector 140 extends between a swivellable front bunk 141 mounted on a tractor, not shown, and the trailer 91 of Fig. 10. Because l;he trailer 91 is a non-rocking trailer, a stabilizing link portion or equivalent is not required. The fourth embodiment 140 has a central longitudinal axis 142 and first and second diagonal link portions 143 and 144 of generally equal length. The link portions cross each other at an intersection 145 which is generally adjacent the central longitudi-~70~3 (30) nal axis 142. For improved tracking, the links canbe clamped at the intersection with a cable clamp 145.1, but in some conditions acceptable performance can be obtained with the link portions not connected at this intersection but merely passing each other in a vertical plane. The first link portion 143 extends from a right hand end of the front bunk 141 to a left hand portion of the trailer 91, and the second link portion extends from a left hand front bunk to a right hand portion of the trailer. Connec-tions at opposite ends of the link portions are gene-rally similar to those as previously described, and suitable adjustment means are provided to permit fine adjustment of the length of the link portions. It can be seen that this is one of the simplest embodiments of the trailer connector and, as shown, it can only be used with a non-rocking trailer, When the links a~e unclamped at the intersection 145, there is usually essentially zero relative axial movement between the link portions 143 and 144, but this arran~ement is not preferred for most situations. When the link portions are clamped at 145.1, the clamp means can then be used as an anchor for a forward end of a stabilizing link portion, which could extend to a ~67~3 (31) substitute trailer which could be of the rocking type, and similar to that described with re~erence to Fig. 1, This alternative is not illustrated, but is clearly an equivalent, Fig. 15 An alternative tractor and trailer combination 146 utilizes a conventional tractor 147 with a swivellable front or first bunk 148 mounted for swivelling on the tractor as pre-viously described, An intermediate trailer 150 is connected to the tractor by first trailer connecting means 152 which extend from the front bunk to a forward portion of the trailer 150. The trailer 150 has a fixed intermediate trailer front bunk 154, and a swivellable intermediate trailer rear bunk 156 and is carried on a tandem axle arrangement 158 so as to provide a solid, essen-tially non-rocking bed for the bunks 154 and 156.
A rear trailer 160 is connected to the intermediate trailer 150 by second trailer connecting means 162 extending from the rear bunk 156 to a front of the trailer 160. The trailer 160 is similar to the non-rocking trailer 91 of Figs. 9 and 10, and has a tandem axle arrangement 164 and a ~ixed second (~2) trailer rear bunk 166. The first and second trailer connecting means 152 and 162 include undesignated front and rear link portions, gene-rally similar to that shown in Figs. 1 through 3, but the alternatives herein described can be sub-stituted, The combination 146 can carry two separate self-supporting front and rear loads 167 and 168 shown in broken outline, the loads being mounted between the bunks 14~ and 154, and between the bunks 156 and 166 respectively. Clearly, to prevent interference when turning, sufficient clearance must be provided between adjacent ends of the loads overhanging the bunks on the intermediate trailer 150.
In summary, all embodiments of the trailer connector use lengths of flexible steel cable and conventional cable connections, etc., and thus the capital investment for the connector is relatively low.
The embodiments of the trailer can be obtained by eliminatLng the trailer reach and swivellable bunk of a conventional logging trailer and substituting cable anchors and a fixed or non-swivelling bunk. The connector is used as a support for trailer service conduits. The fixed trailer bunk helps to stabilize 1 3 670~ 3 (33) the load against wobble that can occur wi~h two swivelling bunks.
Summarizing the embodimen-ts structurally, it can ~e seen that the invention provides a flex-ible link means with a forward connection means for connecting a forward end portion of the flexible link means to the swivellablé front bunk, and a rear connection means for connecting a rear end portion of the flexible link means to the trailer. It can be seen that the forward and rear connection means have several different structures, for example, the forward link portions 41 and 42 and the rear link portions 47 and 48 of Figs. 1 and 2, the corres-ponding link portions of Fig. 9, the forward andrear alignment frame 134 and 138 of Figs. 12 and 13 and the diagonal link portions 143 and 144 of Fig. 14. All these structures are considered to function equivalently and require that the forward connection means have forward portions cooperating with two laterally spaced positions on the swivel-lable front bunk, and the rear connection means cooperating with two laterally space~d positions on the trailer~ The positions on the bunk for the forward connection are spaced equally from the central longltudinal axis, and the positions on ~70~3 (34) the trailer for the rear connection are similarly spaced equally from the longitudinal axis.
the loop connector 44. A stabilizing link 51 extends from a forward end at the loop connector to a rear end secured to a cable anchor 55 on the 15' frame 24, The stabilizing link 51 passes around a pulley 53 mounted on a portion of the trailer spaced beneath a straight line 57 extending bet-ween rear connections of the rear link portions with the trailer, as will be described with ref-erence to Fig. 8, Without the stabilizing linkwhen the trailer is unloaded it would otherwise be free to rock longitudinally about the beam axis 37, Therefore, the stabilizing link 51 is required in cooperation with the link portions 47' and 48 to provide three spaced suppor~s to prevent uncontrolled rocking of the trailer frame I ~ 67083 ~12) 24 relative to the wheels 22. It can be seen that the loop connector 44 is 3 in fact, a joining means to join the forward link portions to the rear link portions and also the stabilizing link to the forward and rear link portions, and in some circumstances can be eliminated, or equiva-lents can be substituted, as will be described.
The link portions 41, 42, 47 and 48 and the stabilizing link 51 are all suitably flexible steel cable of a diametcr of between 0.5 cm. and 2 cm. and thus have sufficient strength to hold the rear trailer when unloaded and yet resist any tendency to form permanent kinks resulting from excessive non-elastic bend-ing of the cable. If a length of cable becomes damaged, for example by a truck running over the cable such that the cable does not straighten under light loads, it should he discarded other-wise it will shorten effective length of thecable. The trailer connector 14 is used primar-ily to align the axles of the trailer with the rear axles of the tractor prior to loading logs onto the bunks.
The front and rear link portions, the I ~ G70(~3 (13) stabilizing link and loop connector 44 are all disposed symmetrically about a central longitudi-nal axis 59 of the combination 10, and thus it can be seen t~at the trailer connector 14 is a connector Link means extending symmetrically about the central longitudinal axis between at least two laterally spaced positions on the front bunk and at least two laterally spaced positions on the trailer.
The rear bunk 26 has a transversely extending row of teeth or serrations 62 extending between the stakes 30, and front and rear portions of the trailer frame 24 have similar sets of teeth or serrations 64 and 65 respectively dis-posed so aY to be at a similar height to the teeth 62. Tie down cables 63 draw the logs onto the teeth 62, 64 and 65 to augment restraint o~
rear ends of the logs on the trailer due to dead weight of the log. Clearly, if a load other than logs were to be carried, the teeth or serrations 62, 64 and 65 would be modified to be appropriate for the load. In any event, means to reduce a tendency of the load to shift relative to the rear trailer is provided so as to maintain alignment of the trailer axle or axles relative to line of ~ . , I ~ ~7033 travel of the combination, that is the trailer axle sl~ould at all times be disposed normally to and symmetrically of the longitudinal axis 59.
Pintle and gudgeon means 66 or equivalents there-of are fitted at a rear end of the tractor 11 and at a for-ward end of the trailer 12 for towing the trailer behind the tractor when unloaded. This is an alternative to the common "piggybackl' method of carrying an unloaded logging trailer, although "piggyback" carrying is easy with this invention because trailer service conduits do not require disconnection~
Figs. 4 and 5 The loop connector 44 is an annulus adapted to receive eyes fitted to ends of the cables repre-senting the forward link portions 41 and 42 ~ the rear link portions 47 and 48, and the stabilizing link portion 51. Referring to Fig 5, the left hand forward and rear link portions 42 and 48 have res-pective eyes 6~ and 69 forrned at ends of the respec-tive link portions and secured by c~lindrical ferrules 71 and 72 respectively. Openings of the eyes can be reinforced with bushings (not shown) if desired, to prevent excessive wear of the cables on the loop connector 44r As seen in Fig. 4, the connector 44 is formed from two semi-circular half portions 73 6~0~3 , (15) and 74 connected together by nut and bolt means 75 to permit easy connection and disconnection of the link portions, thus serving as a releasable cable connecting means, Opposite ends of all the link portions are similarly provided with eyes secured by ferrules, as shown in Fig. 5, Other means to permit easy connection and disconnection of link portions can be substi~uted.
Figs. 6 and 7 The cable anchor 39 for one link portion is as follows. A rear end of the left hand link portion 48 is connected to a portion of the trailer spaced from the longitudinal axis 59, as shownO The link portion 48 has an eye 76 secured by a ferrule 77 in a manner similar to that previously Jescrlbed~ A
portion of the traller frame 24 is shown and has a bracket 79 extending from a corner somewhat forward of the wheels 22, a portion of one wheel being shown.
An eye bolt 80 has an eye 81 at a forward end thereof and a threaded shank 82 received in a clearance open-ing passing through the bracket 79. The clearance opening in the bracket permits the bolt 80 to align itself with the link portion 48, thus reducing ~r eliminating bending loads on the bolt 80. Nut and t - washer means 83 and ~4 are fitted on opposite sides .. . .. .. .
I l ~70S3 - (16) of the bracket 79 and it can be seen that by loosen-ing one nut and tightening the other nut, the eye bolt 80 can be moved longitudinally according to an arrow 85. This provides a fine adjustment for length of the link portion 48, as well as provid-ing an economical and simple means of securing the link portion to the trailer.
, Forward ends of the forward link portions 41 and 42, see Fig, 2, can be similarly secured to the anchors 39 at opposite ends of the front bunk 17 with similar bracket, eye bolt and nut and washer means to provide similar accurate adjustment of length of the forward link portions also. The stabilizing link portion 51 has a rear end simi-larly connected to the trailer, but the associated bracket extends from the trailer adjacent the longitudinal axis 59. Thus effective length of each of the link portions can be adjusted accur-, ately an adequate amount to permit accurate loca-tion of the loop connector 44 relative to the axis 59 of the combination 10. Clearly, prior to use, an accurate ali~nment of the trailer axles with the tractor axles is required. This align-ment is accomplished with the combination parkedon smooth level ground and the rear trailer is ~ l 670~3 (17) manually positioned in the approximate location rearwardly of the tractor. Conventional alignment measurements are taken and the nut and bolt means are adjusted to provide fine adjustment of the cable length following, in general, normal align-ment practice in maintenance yards.
Figo 8 The trailer frame 24 is shown broken and diagrammatically to illustrate the effect of the stabilizing link portion 51 and the pulley 53 relative to the beam axis 37. Without the res-traint of the load and the link portions 47, 48 and 51 on the rear trailer, the frame and bunk would be free to rock longitudinally about the beam axis 37 which serves as a transverse rocker axis for the trailer, This is termed a "rocking"
trailer. With no load on the trailer 12, tension in the link portions 47 and 48 would apply a turn-ing moment on the frame 24 about the axis 37 in direction of an arrow 87 ~ and tension in the stab-ilizing link portion 51 through the pulley 53 and cable anchor 55 applies a turning moment in an opposite direction in accordance with an arrow 88 It can be seen that, by fine adjustment of the 7~$3 (18) length of the appropriate link portions, and thus resulting tension, the frame 24 can be stabilized against the rocking tendency that would otherwise occur prior to loading.
s In summary, the pulley 53 is positioned within a central plane containing the longitudinal a~is 59 (Fig.
2 only) and is spaced beneath the straight line 57 ex-tending between the rear connections of the link portions, The stabilizing link passes downwardly and rearwardly beneath the pulley 53 and then upwardly to the rear connection at the anchor 55 positioned within the central plane and disposed rearwardly of the pulley, Thus, the pulley and position of the rear anchor serve as counteract-ing means 89 on the trailer cooperating with the stabilizing link portion 51 to counteract a turn ing moment applied by the rear link portions to the trailer, It can be seen that the actual loca-tion of the pulley 53 and the anchor 55 is notcrltical provided there is sufficient vertical spacing between the rear connections of the rear link portions and the pulley, although the pulley is not required to be positioned directly verti-cally beneath the straight line 57 connecting thetwo cable anchors 49, Also, it is not necessary ~ 1 6~0~
(19) ~hat the anchor 55 is aligned horizontally with the rear link portions as shown. Optimum position of the pulley 53 and anchor 55 would be dependent on geometry of the rear trailer, in particular the location of the beam axis 37 and moment arm of force from the rear link portions relative to the beam axis.
OPERATIoN
The trailer connector 14 according to the invention permits easy alignment o the trailer axle prlor to loading logs onto the bunks, assum-ing that there has been accurate adjustment oflink portion lengths as previously described.
After the alignment, the connector 14 serves little purpose apart from that of a redundant safety connection between the trailer and the tractor, and also for providing support for electrical, pneumatic and hydraulic service conduits, not show shown, extending between the tractor and trailer.
At a log loading station, the tractor Z5 and trailer are positioned under the log loader, not shown, and all that is required is that the (20) wheels 22 of the trailer run initially on rela-~ively smooth and level ground so as to reduce any tendency of the ~railer wheels to move assymmetri-cally as the tractor moves forwardly. The ~ractor moves forwardly for a few Eeet so that the link portions 41, 42, 47, 4& and 51 become taut, at which time the rear bunk 26 will be essentially parallel to the front bunk 17. This is performed slowly so that as the brakes are applied, the wheels of the trailer are braked evenly and slowly so that the bunks remain parallel when both the tractor an~ trailer stop, thus maintain-ing approximately equal tautness in all the links.
If the trailer has independent braking 5 it may be advantageous to brake the trailer somewhat before the tractor so as to assist in maintaining taut-ness of the cables. The brakes are now set on both the tractor and trailer and placement o~
wheel chocks at the trailer wheels may be advan-tageous to prevent undesirable shifting. Alter-natively, particularly on slippery or slightly sloping ground, in a non~illustrated alternative, a cable can be connected between a rear of the trailer and a winch or other type of towing vehicle, such as a skidder, and the trailer can ~ 1 670~3 (21) then be pulled sufficiently away from the tractor to tauten the link portions to permit accurate length adjustment thereofO
The tractor and trailer combination is now ready to accept logs which can be loaded bet-ween the front and rear bunks in a normal manner.
When loaded, the logs are retained with the tie down cables 63 as required and longitudinal move-ment of the logs is reduced or eliminated by the serrations which is the normal practice with log-ging trucks.
It can be seen that this approach to alignment ~f tractor wheels is considerably quicker and simpler than in the prior art where the "unconnected" trailer is "manually" posi-tioned accurately each time ~he combination is loaded. With this invention, the trailer is pogitioned accurately "manually" once only when the link portions are adjusted, after which the alignment i8 e~ected automatically by the link portions.
.
6~83 (22) It can be seen that the method according to the invention is characterized by providing a flexible link means and connecting one end of the flexible link means to the swivellable front bunk and an opposite end thereof to the trailer. The tractor is moved forward whilst towing the trailer through the link means until a longitudinal cen-tral axis of the trailer, which is undesignated but coincident with the axis 59, is accurately aligned with the pivot axis of the swivellable front bunkO The self-supporting load is placed on the front and rear bunks and the front and rear portions of the load are securely fastened to the front and rear bunks.
ALTERNATIVES AND EQUIVALENTS
Fi~s. 9 and 10 A second embodiment of a trailer 91 has a trailer bunk 93 having spaced stakes 94 which 3 ~70~3 2 3) are similar to those previously described. The trailer 91 has a trailer frame 96 mounting a con-ventional tandem axle trailer suspension 9~ uti-lizing sets of resilient springs 99. The frame 96 and suspension is such that there is a negli-gible rocking tendency between the wheels and the frame and thus is termed a "non-rocking" trailer.
With a non-rocking trailer, the stabilizing link 51 of the connector 14 of Figso 1 through 8 can be eliminated. This provides a simpler alterna-tive second embodiment of a trailer connector, designated 101, which is limited for use on trailers having a suspension and frame such that there is negligible rocking therebetween, apart from that occuring with normal suspension ~eflec-tion.
The trailer connector 101 lncludes right hand and left hand forward link portions 103 and 104 connected to a swivellable front bunk 100 on the tractor, not shown, and right hand and left hand rear link portions 105 and 106 connected to 1 1 6~083 (24) the trailer 91. An intermediate link portion 108has forward and rear loop connectors 109 and 110 at forward and rear ends thereof. The forward link portions are connected to the forward loop connector, and the rear link portions are connected to the rear loop connector. Ends of the link portions are provided with eyes that cooperate with the loop connectors, and with ring bolts (not shown) mounted in brackets carried on the trailer 91 and the forward bunk in a manner simi-lar to that previously described with reference to Figs. 5 through 7.
It can be seen that the intermediate link portion 10~ extends along a central axis 111 of the combination so as to provide a symmetrical arrangement. A particular advantage for use of an intermediate link portion is that a turnbuckle, not shown, or equivalent length adjustment means can be provided to cooperate with the intermediate link to permit easy length adjustment without adjusting the eye bolts associated with the trailer or front bunk. This prevents a possible loss of alignment that mi~ht otherwise occur if the ring 1 1 670~3 (25) bolts were adjusted. Alternatively, intermediate links of different lengths could be fitted between the loop connectors to accomodate loads of widely differing lengths. The intermediate link also serves as a joining means to join the forward link portions to the rear link portions.
Clearly, if desired, the trailer connector 101 could be provided with a stabilizing link por-tion extending between the rear loop connector llOand the trailer in a manner similar to ~he link portion 51 of Figs. 1 through 3, and this would then permit use of a "rocking" trailer in which the frame thereof could rock relative to the sus-pension similarly to the trailer 12.
Fig. 11 An alternative "rocking" trailer 113 is generally similar to the trailer 12 of Figs. 1through 8, but differs by elimination of the pulley 53 and by substituting an upwardly curved walking beam 114 for the beam 35. The beam 114 is journalled on a trailer frame 115 for rocking about a rocker axis or beam a~is 116, as previous-ly described. An alternative means to counteract ~70~3 (26) a rocking tendency of the alternative rocking trailer includes a downwards extension 117 extend-ing from a portion of the frame 115 to a cable anchor 118 which is disposed within a central plane containing a central longitudinal axis, neither of which are shown, and below and forwardly of the rocker axis 116. The anchor 118 is con-nected to a rear end of the stabilizing link por-tion 51 which is thus positioned forwardly of and below the rocker axis and within the cen~ral plane.
The rear link portions 47 and 48 (of Figs. 1 through 8) have rear connections or anchors positioned above the rocker axis and apply a turning moment to the frame about the axis 116 in direction of an arrow 112. The stabilizing link portion 51 applies an cpposite turning molnent to the frame in direction of an arrow 119. Thus it can be seen that by accurate adjustment of the appropriate link lengths, the trailer can be stabilized against excessive rocking. It can be seen that the down-wards extension 117 and the location of the cable anchor 118 cooperating with the stabilizing link portion is thus equivalent to the pulley 53 and cable anchor 55 of Fig. 1, and thus serve as counteracting means on the trailer cooperating with the stabilizing link to counteract a turning ~ ~ 6~S3 (27) moment applied by the rear link portions to the trailer.
Figs. 12 and 13 A third embodiment of a trailer connector, designated 120, is shown for use with a trailer 122 which is generally similar to the trailer 91 of Figs. 9 and 10, ie, a non-rocking trailer. How-ever, as described with reference to Figs. 9 and10, if a stabilizing link portion or equivalent were fitted, with suitable modification, the trailer connector 120 could be used with the rock- ' ing trailer 12 of Figs. 1 through 3. A tractor, not shown, has a ront bunk 126 having spaced stakes 127 and is mounted for pivotting about an axis 128, The trailer connector 120 :includes a single flexible cable serving as a main flexible tension link portion 130 having a forward end 131 secured centrally of the bunk and a rear end 132 secured centrall,y of,the trailer, The front bunk has a forward alignment frame 134 extending rear-wardly therefrom, the frame having a front eye135 to accept the cable of the portion 130. The ~ ~ 67~3 (28) frame 134 has right hand and left hand struts 136 and 137 respectively extending from positions spaced equally from the axis 12& to provide a support for the eye 135 that resists sideways and vertical deflections. It can be seen that the alignment frame swings about the pivot axis 128 as the front bunk 126 swivels about the axis. The trailer has a rear alignment frame 138 extending rigidly and forwardly from the trailer, the frame 13~ being similar to the frame 134 and having a rear eye 139 therein to accept the link portion 130.
The frames 134 and 13~ are forward and rear alignment means provided on the front bunk and trailer respectively. The frames are disposed symmetrically about a central longitudinal axis 125 and function in a manner similar to the right hand and left hand forward and rear link portions o the embodiments shown in Figs. 1 through 3 and Figs, 9 and 10, An alterna~ive structure using the align-ment frames as above described could secure forward and rear ends of the portion 130 directly to the alignment frames themselves, thus eliminating ~he - I 1 6~083 (29) direct connection of the link portion to the front bunk and trailer. The alternative frames would thus carry tensile forces also, and would likely have to be stronger than the ~rames that merely provide guiding eyes for the cable. Both of these structures could utilize a flexible tension link, preferably a cable, although a link chain could be used in some circumstances. It would be expected that the trailer using the rigid align-ment frames as above described would have aslower response for alignment than the cable con-nectors of Figs. 1 through 3 and Figs. 9 and 10.
Fi~. 14 A fourth embodiment of a trailer con-nector 140 extends between a swivellable front bunk 141 mounted on a tractor, not shown, and the trailer 91 of Fig. 10. Because l;he trailer 91 is a non-rocking trailer, a stabilizing link portion or equivalent is not required. The fourth embodiment 140 has a central longitudinal axis 142 and first and second diagonal link portions 143 and 144 of generally equal length. The link portions cross each other at an intersection 145 which is generally adjacent the central longitudi-~70~3 (30) nal axis 142. For improved tracking, the links canbe clamped at the intersection with a cable clamp 145.1, but in some conditions acceptable performance can be obtained with the link portions not connected at this intersection but merely passing each other in a vertical plane. The first link portion 143 extends from a right hand end of the front bunk 141 to a left hand portion of the trailer 91, and the second link portion extends from a left hand front bunk to a right hand portion of the trailer. Connec-tions at opposite ends of the link portions are gene-rally similar to those as previously described, and suitable adjustment means are provided to permit fine adjustment of the length of the link portions. It can be seen that this is one of the simplest embodiments of the trailer connector and, as shown, it can only be used with a non-rocking trailer, When the links a~e unclamped at the intersection 145, there is usually essentially zero relative axial movement between the link portions 143 and 144, but this arran~ement is not preferred for most situations. When the link portions are clamped at 145.1, the clamp means can then be used as an anchor for a forward end of a stabilizing link portion, which could extend to a ~67~3 (31) substitute trailer which could be of the rocking type, and similar to that described with re~erence to Fig. 1, This alternative is not illustrated, but is clearly an equivalent, Fig. 15 An alternative tractor and trailer combination 146 utilizes a conventional tractor 147 with a swivellable front or first bunk 148 mounted for swivelling on the tractor as pre-viously described, An intermediate trailer 150 is connected to the tractor by first trailer connecting means 152 which extend from the front bunk to a forward portion of the trailer 150. The trailer 150 has a fixed intermediate trailer front bunk 154, and a swivellable intermediate trailer rear bunk 156 and is carried on a tandem axle arrangement 158 so as to provide a solid, essen-tially non-rocking bed for the bunks 154 and 156.
A rear trailer 160 is connected to the intermediate trailer 150 by second trailer connecting means 162 extending from the rear bunk 156 to a front of the trailer 160. The trailer 160 is similar to the non-rocking trailer 91 of Figs. 9 and 10, and has a tandem axle arrangement 164 and a ~ixed second (~2) trailer rear bunk 166. The first and second trailer connecting means 152 and 162 include undesignated front and rear link portions, gene-rally similar to that shown in Figs. 1 through 3, but the alternatives herein described can be sub-stituted, The combination 146 can carry two separate self-supporting front and rear loads 167 and 168 shown in broken outline, the loads being mounted between the bunks 14~ and 154, and between the bunks 156 and 166 respectively. Clearly, to prevent interference when turning, sufficient clearance must be provided between adjacent ends of the loads overhanging the bunks on the intermediate trailer 150.
In summary, all embodiments of the trailer connector use lengths of flexible steel cable and conventional cable connections, etc., and thus the capital investment for the connector is relatively low.
The embodiments of the trailer can be obtained by eliminatLng the trailer reach and swivellable bunk of a conventional logging trailer and substituting cable anchors and a fixed or non-swivelling bunk. The connector is used as a support for trailer service conduits. The fixed trailer bunk helps to stabilize 1 3 670~ 3 (33) the load against wobble that can occur wi~h two swivelling bunks.
Summarizing the embodimen-ts structurally, it can ~e seen that the invention provides a flex-ible link means with a forward connection means for connecting a forward end portion of the flexible link means to the swivellablé front bunk, and a rear connection means for connecting a rear end portion of the flexible link means to the trailer. It can be seen that the forward and rear connection means have several different structures, for example, the forward link portions 41 and 42 and the rear link portions 47 and 48 of Figs. 1 and 2, the corres-ponding link portions of Fig. 9, the forward andrear alignment frame 134 and 138 of Figs. 12 and 13 and the diagonal link portions 143 and 144 of Fig. 14. All these structures are considered to function equivalently and require that the forward connection means have forward portions cooperating with two laterally spaced positions on the swivel-lable front bunk, and the rear connection means cooperating with two laterally space~d positions on the trailer~ The positions on the bunk for the forward connection are spaced equally from the central longltudinal axis, and the positions on ~70~3 (34) the trailer for the rear connection are similarly spaced equally from the longitudinal axis.
Claims (27)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A trailer connector for use in a tractor and trailer combination for carrying an elongated, self-supporting load; in which the tractor has a swivellable front bunk mounted for pivotting about a pivot axis and is adapted to retain a front portion of the load thereon;
and the trailer has a rear bogey having at least one pair of road bearing wheels and a non-swivelling rear bunk mounted on the bogey and adapted to retain a rear portion of the load thereon; the trailer connector being characterized by:
(a) flexible link means, forward connection means for connecting a forward end portion of the flexible link means to the front bunk, and rear connection means for con-necting a rear end portion of the flexible link means to the rear trailer, so that when the trailer is unloaded and pulled by the tractor over a substantially level sur-(36) face a longitudinal central axis of the trailer becomes aligned with the pivot axis of the front bunk.
and the trailer has a rear bogey having at least one pair of road bearing wheels and a non-swivelling rear bunk mounted on the bogey and adapted to retain a rear portion of the load thereon; the trailer connector being characterized by:
(a) flexible link means, forward connection means for connecting a forward end portion of the flexible link means to the front bunk, and rear connection means for con-necting a rear end portion of the flexible link means to the rear trailer, so that when the trailer is unloaded and pulled by the tractor over a substantially level sur-(36) face a longitudinal central axis of the trailer becomes aligned with the pivot axis of the front bunk.
2. A trailer connector as claimed in Claim 1 further characterized by:
(a) right hand and left hand forward link portions extending rearwardly from the front bunk to serve as forward connection means, (b) right hand and left hand rear link portions extending forwardly from the trailer to serve as rear connection means, (c) joining means to join the forward link portions to the rear link portions.
(a) right hand and left hand forward link portions extending rearwardly from the front bunk to serve as forward connection means, (b) right hand and left hand rear link portions extending forwardly from the trailer to serve as rear connection means, (c) joining means to join the forward link portions to the rear link portions.
3. A trailer connector as claimed in Claim 2 further characterized by:
(a) the joining means being a flexible tension link having a forward end con-nected to the forward link portions and a rear end connected to the rear link portions.
(37)
(a) the joining means being a flexible tension link having a forward end con-nected to the forward link portions and a rear end connected to the rear link portions.
(37)
4. A trailer connector as claimed in Claim 2 in which the rear bogey has a suspension such that the rear bunk can rock longitudinally in a forward and rearwards manner relative to the wheels about a transverse rocker axis, and the connector link means is further characterized by:
(a) a stabilizing link extending between a forward connection of the rear link portions and a portion of the trailer spaced beneath a straight line extend-ing between rear connections of the rear link portions with the trailer, (b) counteracting means on the trailer cooperating with the stabilizing link to counteract a turning moment applied by the rear link portions to the trailer.
(a) a stabilizing link extending between a forward connection of the rear link portions and a portion of the trailer spaced beneath a straight line extend-ing between rear connections of the rear link portions with the trailer, (b) counteracting means on the trailer cooperating with the stabilizing link to counteract a turning moment applied by the rear link portions to the trailer.
5. A trailer connector as claimed in Claim 1 further characterized by:
(a) forward and rear alignment means provided on the front bunk and the trailer respec-tively to serve as forward and rear connec-tion means respectively, (38) (b) a flexible tension link means having a forward end secured to the front bunk adjacent the pivot axis and a rear end secured to the trailer adjacent the central axis thereof.
(a) forward and rear alignment means provided on the front bunk and the trailer respec-tively to serve as forward and rear connec-tion means respectively, (38) (b) a flexible tension link means having a forward end secured to the front bunk adjacent the pivot axis and a rear end secured to the trailer adjacent the central axis thereof.
6. A trailer connector as claimed in Claim 5 in which the alignment means is further charac-terized by:
(a) a forward alignment frame extending rear-wardly from the front bunk and having a front eye therein to accept the flexible tension link means, the alignment frame swinging about the pivot axis as the front bunk swivels, (b) a rear alignment frame extending rigidly and forwardly from the trailer and having a rear eye therein to accept the flexible tension link means, and the flexible tension link means is further characterized by:
(c) a cable extending through the eyes of the (39) two alignment frames.
(a) a forward alignment frame extending rear-wardly from the front bunk and having a front eye therein to accept the flexible tension link means, the alignment frame swinging about the pivot axis as the front bunk swivels, (b) a rear alignment frame extending rigidly and forwardly from the trailer and having a rear eye therein to accept the flexible tension link means, and the flexible tension link means is further characterized by:
(c) a cable extending through the eyes of the (39) two alignment frames.
7. A trailer connector as claimed in Claim 1 further characterized by:
(a) first and second diagonal link portions of generally equal length crossing each other adjacent the central longitudinal axis, the first link portion extending from a right hand end of the front bunk to a left hand portion of the trailer and the second link portion extending from a left hand end of the front bunk to a right hand portion of the trailer.
(a) first and second diagonal link portions of generally equal length crossing each other adjacent the central longitudinal axis, the first link portion extending from a right hand end of the front bunk to a left hand portion of the trailer and the second link portion extending from a left hand end of the front bunk to a right hand portion of the trailer.
8, A trailer connector as claimed in Claim 1 further characterized by:
(a) the flexible link means having a connector link means extending symmetrically about a central longitudinal axis of the com-bination, (b) the forward connection means cooperating with at least two laterally spaced posi-tions on the front bunk, (40) (c) the rear connection means cooperating with at least two laterally spaced posi-tions on the trailer.
(a) the flexible link means having a connector link means extending symmetrically about a central longitudinal axis of the com-bination, (b) the forward connection means cooperating with at least two laterally spaced posi-tions on the front bunk, (40) (c) the rear connection means cooperating with at least two laterally spaced posi-tions on the trailer.
9. A trailer and trailer connector for use in a tractor and trailer combination for carrying an elongated, self-supporting load; in which the tractor has a swivellable front bunk mounted for pivotting about a pivot axis and is adapted to retain a front portion of the load thereon; the trailer being characterized by:
(a) a rear bogey having at least one pair of road bearing wheels and a non-swivelling rear bunk mounted on the bogey and adapted to retain a rear portion of the load thereon, and the trailer connector being characterized by:
(b) flexible link means, forward connection means for connecting a forward end portion of the flexible link means to the front bunk, and rear connection means for connecting a rear end portion of the flexible link means to the rear trailer, so that when the trailer is unloaded and pulled by (41) the tractor over a substantially level surface a longitudinal central axis of the trailer becomes aligned with the pivot axis of the front bunk.
(a) a rear bogey having at least one pair of road bearing wheels and a non-swivelling rear bunk mounted on the bogey and adapted to retain a rear portion of the load thereon, and the trailer connector being characterized by:
(b) flexible link means, forward connection means for connecting a forward end portion of the flexible link means to the front bunk, and rear connection means for connecting a rear end portion of the flexible link means to the rear trailer, so that when the trailer is unloaded and pulled by (41) the tractor over a substantially level surface a longitudinal central axis of the trailer becomes aligned with the pivot axis of the front bunk.
10. A trailer and trailer connector as claimed in Claim 9 further characterized by:
(a) the flexible link means having a connector link means extending symmetrically about a central.
longitudinal axis of the combination, (b) the forward connection means cooperating with at least two laterally spaced posi-tions on the front bunk, (c) the rear connection means cooperating with at least two laterally spaced positions on the trailer.
(a) the flexible link means having a connector link means extending symmetrically about a central.
longitudinal axis of the combination, (b) the forward connection means cooperating with at least two laterally spaced posi-tions on the front bunk, (c) the rear connection means cooperating with at least two laterally spaced positions on the trailer.
11. A trailer and trailer connector as claimed in Claim 9 further characterized by:
(a) right hand and left hand forward link portions extending rearwardly from the front bunk to serve as forward connection means, (b) right hand and left hand rear link portions (42) extending forwardly from the trailer to serve serve as rear connection means, (c) joining means to join the forward link portions to the rear link portions.
(a) right hand and left hand forward link portions extending rearwardly from the front bunk to serve as forward connection means, (b) right hand and left hand rear link portions (42) extending forwardly from the trailer to serve serve as rear connection means, (c) joining means to join the forward link portions to the rear link portions.
12. A trailer and trailer connector as claimed in Claim 11 further characterized by:
(a) the rear bogey having a suspension such that the rear bunk can rock longitudinally in a forward and rearwards manner relative to the wheels about a transverse rocker axis, and the connector link means is further char-acterized by:
(b) a stabilizing link extending between a forward connection of the rear link por-tions and a portion of the trailer spaced beneath a straight link extending between rear connections of the rear link portions with the trailer, (c) counteracting means on the trailer cooper-ating with the stabilizing link to counter-(43) act a turning moment applied by the rear link portions to the trailer.
(a) the rear bogey having a suspension such that the rear bunk can rock longitudinally in a forward and rearwards manner relative to the wheels about a transverse rocker axis, and the connector link means is further char-acterized by:
(b) a stabilizing link extending between a forward connection of the rear link por-tions and a portion of the trailer spaced beneath a straight link extending between rear connections of the rear link portions with the trailer, (c) counteracting means on the trailer cooper-ating with the stabilizing link to counter-(43) act a turning moment applied by the rear link portions to the trailer.
13. A trailer and trailer connector as claimed in Claim 12 in which the rear connections are positioned above the rocker axis, and in which counteracting means is further characterized by:
(a) a pulley positioned within a central plane containing the longitudinal axis and spaced beneath the straight line extending between the rear connections of the rear link portions, (b) the stabilizing link passing beneath the pulley and upwardly to an anchor positioned within the central plane and disposed rearwardly of the pulley.
(a) a pulley positioned within a central plane containing the longitudinal axis and spaced beneath the straight line extending between the rear connections of the rear link portions, (b) the stabilizing link passing beneath the pulley and upwardly to an anchor positioned within the central plane and disposed rearwardly of the pulley.
14. A trailer and trailer connector as claimed in Claim 12 in which the rear connections are positioned above the rocker axis, and in which the counteracting means is further characterized by:
(44) (a) a downwards extension extending from the trailer to a cable anchor positioned below and forwardly of the rocker axis, the anchor being disposed within a central plane containing the central longitudinal axis, (b) the stabilizing link portion has a rear end connected to the cable anchor of the downwards extension,
(44) (a) a downwards extension extending from the trailer to a cable anchor positioned below and forwardly of the rocker axis, the anchor being disposed within a central plane containing the central longitudinal axis, (b) the stabilizing link portion has a rear end connected to the cable anchor of the downwards extension,
15. A trailer and trailer connector as claimed in Claim 9 in which the trailer connector is further characterized by:
(a) first and second diagonal link portions of generally equal length crossing each other adjacent the central longitudinal axis, the first link portion extending from a right hand end of the front bunk to a left hand portion of the trailer, the second link portion extending from a left hand end of the front bunk to a right hand portion of the trailer.
(a) first and second diagonal link portions of generally equal length crossing each other adjacent the central longitudinal axis, the first link portion extending from a right hand end of the front bunk to a left hand portion of the trailer, the second link portion extending from a left hand end of the front bunk to a right hand portion of the trailer.
16. A trailer and trailer connector as claimed (45) in Claim 9 further characterized by:
(a) forward and rear alignment means provided on the front bunk and the trailer respectively to serve as forward and rear connection means respectively, (b) a flexible tension link means having a forward end secured to the front bunk adjacent the pivot axis and a rear end secured to the trailer adjacent the central axis thereof.
(a) forward and rear alignment means provided on the front bunk and the trailer respectively to serve as forward and rear connection means respectively, (b) a flexible tension link means having a forward end secured to the front bunk adjacent the pivot axis and a rear end secured to the trailer adjacent the central axis thereof.
17. A trailer and trailer connector as claimed in Claim 16 further characterized by:
(a) a forward alignment frame extending rear-wardly from the front bunk and having a front eye therein to accept the flexible tension link means, the alignment frame swinging about the pivot axis as the front bunk swivels, (b) a rear alignment frame extending rigidly and forwardly from the trailer and having a rear eye therein to accept the flexible tension link means.
(46)
(a) a forward alignment frame extending rear-wardly from the front bunk and having a front eye therein to accept the flexible tension link means, the alignment frame swinging about the pivot axis as the front bunk swivels, (b) a rear alignment frame extending rigidly and forwardly from the trailer and having a rear eye therein to accept the flexible tension link means.
(46)
18. A trailer and trailer connector as claimed in Claim 9 in which the trailer is a rear trailer and the truck and trailer combination is adapted to carry two separate self-support-ing front and rear loads, the combination being characterized by:
(a) an intermediate trailer disposed between the tractor and rear trailer, the inter-mediate trailer having a fixed intermediate trailer front bunk and a swivellable intermediate trailer rear bunk, the front load being carried on the front bunk of the tractor and the intermediate trailer front bunk, and the rear load being carried on the intermediate trailer rear bunk and the bunk of the rear trailer, the connector link means being characterized by:
(b) a first trailer connecting means extend-ing from the front bunk of the tractor to a forward portion of the intermediate trailer, and a second trailer connecting means extending from the rear bunk of (47) the intermediate trailer to a front of the rear trailer, the connector link means automatically align-ing both the trailers behind the tractor.
(a) an intermediate trailer disposed between the tractor and rear trailer, the inter-mediate trailer having a fixed intermediate trailer front bunk and a swivellable intermediate trailer rear bunk, the front load being carried on the front bunk of the tractor and the intermediate trailer front bunk, and the rear load being carried on the intermediate trailer rear bunk and the bunk of the rear trailer, the connector link means being characterized by:
(b) a first trailer connecting means extend-ing from the front bunk of the tractor to a forward portion of the intermediate trailer, and a second trailer connecting means extending from the rear bunk of (47) the intermediate trailer to a front of the rear trailer, the connector link means automatically align-ing both the trailers behind the tractor.
19. A method of transporting an elongated self-supporting load with a tractor and trailer combination in which the tractor has a swivellable front bunk mounted for pivotting about a pivot axis and the trailer has a non-swivelling rear bunk, the method having steps of:
(a) providing a flexible link means, (b) connecting one end of the flexible link means to the front bunk, (c) connecting an opposite end of the flexible link means to the trailer, (d) moving the tractor forwardly while towing the trailer through the link means until a longitudinal axis of the trailer is accurately aligned with the pivot axis (48) of the front bunk, (e) placing a self-supporting load on the front and rear bunks, (f) securely fastening front and rear portions of the load to the front and rear bunks.
(49)
(a) providing a flexible link means, (b) connecting one end of the flexible link means to the front bunk, (c) connecting an opposite end of the flexible link means to the trailer, (d) moving the tractor forwardly while towing the trailer through the link means until a longitudinal axis of the trailer is accurately aligned with the pivot axis (48) of the front bunk, (e) placing a self-supporting load on the front and rear bunks, (f) securely fastening front and rear portions of the load to the front and rear bunks.
(49)
20. Apparatus for use in a tractor and trailer combination for carrying an elongated, self-supporting load in which the tractor has a swivable front bunk mounted for pivoting about a pivot axis and is adapted to retain a front portion of the load thereon, and the trailer has a rear bogey having at least one pair of road bearing wheels and a non-swivelling rear bunk mounted on the bogey and adapted to retain a rear portion of the load thereon the apparatus com-prising:
(a) means for aligning the trailer with the front bunk, said aligning means including flexible link means having right and left hand forward link portions extending rearwardly from the front bunk, and right and left hand rear link portions extending forwardly from the trailer, (b) the forward and rear link portions defining two isosceles triangles having vertices connected to one another along the central longitudinal axis of the combination.
(a) means for aligning the trailer with the front bunk, said aligning means including flexible link means having right and left hand forward link portions extending rearwardly from the front bunk, and right and left hand rear link portions extending forwardly from the trailer, (b) the forward and rear link portions defining two isosceles triangles having vertices connected to one another along the central longitudinal axis of the combination.
21. The apparatus as claimed in Claim 20 in which the rear bogey has a suspension such that the rear bunk can rock longitudinally in a forward and rearward manner relative to the wheels about a transverse (50) rocker axis, and the apparatus further comprises:
(a) a stabilizing link extending between the vertex of the isosceles triangle defined by the rear link portions and a portion of the trailer spaced beneath a straight line extending between rear connections of the rear link portions with the trailer, and (b) counteracting means on the trailer cooperating with the stabilizing link to counteract a turning moment applied by the rear link portions to the trailer.
(a) a stabilizing link extending between the vertex of the isosceles triangle defined by the rear link portions and a portion of the trailer spaced beneath a straight line extending between rear connections of the rear link portions with the trailer, and (b) counteracting means on the trailer cooperating with the stabilizing link to counteract a turning moment applied by the rear link portions to the trailer.
22. The apparatus as claimed in Claim 20, wherein the right hand forward link portion is integral with the left hand rear link portion to define a first diagonal link portion, and the left hand forward link portion is integral with the right hand rear link portion to defined a second diagonal link portion, the first and second diagonal link portions being of equal length and intersecting along the central longitudinal axis.
23. The apparatus as claimed in Claim 22, further including clamp means for clamping the two diagonal link portions together at their intersection.
(51)
(51)
24. The apparatus claimed in Claim 20, further comprising joining means to join the forward link portions to the rear link portions.
25. A method of aligning a trailer having a rear bogey including at least one pair of road bearing wheels and a non-swivelling rear bunk mounted on the bogey and adapted to retain a rear portion of an elongated, self-supporting load thereon with a tractor having a swivable front bunk mounted for pivoting about a pivot axis and adapted to retain a front portion of the load thereon, comprising:
(a) connecting to the front bunk right and left hand forward link portions of a flexible link means;
(b) connecting to the trailer right and left hand rear link portions of the flexible link means, in which the forward and rear link portions define two isosceles triangles having vertices connected to one another along the central longitudinal axis of the combination; and (c) moving the tractor forward, prior to receiving the load, until the flexible link means becomes taut, whereby the non-swivelling rear bunk is aligned with the swivable front bunk.
(52)
(a) connecting to the front bunk right and left hand forward link portions of a flexible link means;
(b) connecting to the trailer right and left hand rear link portions of the flexible link means, in which the forward and rear link portions define two isosceles triangles having vertices connected to one another along the central longitudinal axis of the combination; and (c) moving the tractor forward, prior to receiving the load, until the flexible link means becomes taut, whereby the non-swivelling rear bunk is aligned with the swivable front bunk.
(52)
26. The method of claim 25 further including braking the wheels of the trailer.
27. The method of Claim 26 wherein the wheels of the trailer are braked prior to braking the wheels of the tractor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000359045A CA1167083A (en) | 1980-08-26 | 1980-08-26 | Self aligning truck trailer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000359045A CA1167083A (en) | 1980-08-26 | 1980-08-26 | Self aligning truck trailer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1167083A true CA1167083A (en) | 1984-05-08 |
Family
ID=4117738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000359045A Expired CA1167083A (en) | 1980-08-26 | 1980-08-26 | Self aligning truck trailer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1167083A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114834550A (en) * | 2022-05-24 | 2022-08-02 | 中建四局安装工程有限公司 | A pipeline transfer device for burying formula sewage plant |
-
1980
- 1980-08-26 CA CA000359045A patent/CA1167083A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114834550A (en) * | 2022-05-24 | 2022-08-02 | 中建四局安装工程有限公司 | A pipeline transfer device for burying formula sewage plant |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5451088A (en) | Combination frame-supported box receiver and self-stabilizing bed extension | |
| US7497457B2 (en) | Trailer towing system | |
| US7934743B1 (en) | Convertor dolly with self steering | |
| US5803699A (en) | Apparatus and method for loading and unloading containers | |
| EP0375761A1 (en) | Heavy duty transport vehicle | |
| CA2223290A1 (en) | Weight distributing and sway controlling hitch assembly | |
| US3881749A (en) | Towing coupler assembly for factory made homes | |
| PL181935B1 (en) | Tow bar construction for freight trailers and road trains and road train as such | |
| US4405144A (en) | Self aligning truck trailer | |
| US4200305A (en) | Trailer assembly for carrying overwidth loads | |
| US4438944A (en) | Towing and carrying systems | |
| CA2416765A1 (en) | Dolly for towing disabled trailers | |
| US6050578A (en) | Log trailer load booster | |
| US4358128A (en) | Self aligning truck trailer | |
| CA1072599A (en) | Composite automotive vehicle and components thereof | |
| EP0107746A1 (en) | Trailer connecting running gear | |
| CA1167083A (en) | Self aligning truck trailer | |
| CA1283674C (en) | Equalizing booster axle system | |
| US4219210A (en) | Auxiliary trailer | |
| US4286906A (en) | Adjustable balance, extension boat trailer | |
| CA1051479A (en) | Coupling dolly | |
| US20010026753A1 (en) | Load carrying vehicle | |
| US4335898A (en) | Load shifter assembly for trailers | |
| US3700261A (en) | Spring bar assembly for trailer hitches | |
| US4437680A (en) | Adjustable two-bar linkage for a four-wheel trailer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |