CA1205416A - Log bundle side lift - Google Patents
Log bundle side liftInfo
- Publication number
- CA1205416A CA1205416A CA000405936A CA405936A CA1205416A CA 1205416 A CA1205416 A CA 1205416A CA 000405936 A CA000405936 A CA 000405936A CA 405936 A CA405936 A CA 405936A CA 1205416 A CA1205416 A CA 1205416A
- Authority
- CA
- Canada
- Prior art keywords
- track
- carriage
- apron
- point
- apex
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus to move a load between a first point and a second point. A carriage runs along an inclined track between the two points. There is an apex in the track, adjacent the second point, with a portion of the track being between the apex and the second point. The carriage has a main load bearing platform and an apron pivotally attached to the front of the carriage. At its leading edge the apron can move along the track and, as the leading edge of the apron moves past the apex in the track, the apron pivots downwardly to form a platform down which the load can move off the carriage.
An apparatus to move a load between a first point and a second point. A carriage runs along an inclined track between the two points. There is an apex in the track, adjacent the second point, with a portion of the track being between the apex and the second point. The carriage has a main load bearing platform and an apron pivotally attached to the front of the carriage. At its leading edge the apron can move along the track and, as the leading edge of the apron moves past the apex in the track, the apron pivots downwardly to form a platform down which the load can move off the carriage.
Description
~ZC~S~IL6 This invention relates to an apparatus to move a load between a flrst point and a second polnt. In a pre-ferred application the invention provides a log bundle lift.
Log bundle lifts to transfer bundles of logs, for example logs floating on a river, up a bank and into a mill or into a station from which they may be transported, are well known. Typically the logs are loaded onto a platform which is then winched or otherwise drawn up the track to an unloading station at the top. At the top they may be fed to a conveyor or to any other means of transporting the logs to a desired destination.
An example of a prior art machine is described and claimed in Canadian patent 993,903 issued to Smith et al.
The log bundle conveyor of that patent includes forks that are used to convey the logs first by being positioned under ~he floating logs and then, as the carriage upon which the forks are mounted is moved upwardly, lifting the logs upwardly to a discharge station provided above the water. A
second se~ of forks may be provided to engage the trailing
Log bundle lifts to transfer bundles of logs, for example logs floating on a river, up a bank and into a mill or into a station from which they may be transported, are well known. Typically the logs are loaded onto a platform which is then winched or otherwise drawn up the track to an unloading station at the top. At the top they may be fed to a conveyor or to any other means of transporting the logs to a desired destination.
An example of a prior art machine is described and claimed in Canadian patent 993,903 issued to Smith et al.
The log bundle conveyor of that patent includes forks that are used to convey the logs first by being positioned under ~he floating logs and then, as the carriage upon which the forks are mounted is moved upwardly, lifting the logs upwardly to a discharge station provided above the water. A
second se~ of forks may be provided to engage the trailing
2~ edge of the log bundle or to squeeze the log bundle between the two log forks so that the bundles can be unbanded and the logs handled as individual units.
Examples of other generally similar devices, but not necessarily used for moving log bundles, are disclosed in U.S. Patent 652,069 Achee; U.S. Patent 594,577 to Suppes which describes and claims a means for feeding a blast furnace; U.S. Patent 2,278,946 to Richard et al; U.S. Patent 1,997,217 to Hite which is concerned with a hoist to handle ~S4~16 material in a mine; ~I.S. Patent 370,678 to Brown which describes a skip-car useful in filling a furnace and U.S.
Patent 2,5~8,959 to Campbell which describes an extension ladder including a hoist that may be moved up and down the latter.
Particularly when the load is large, as in a log bundle lift, considerable stress is placed on the structure by the unloading of the logs. As the log bundle reaches the top of the track the carriage tips upwardly and the log bundle sl;des down the remainder of the track with con-siderable force. As the loads carried are many tons the structure can suffer considerably and must, in any event, be of extremely robust construction.
The present invention provides a lift that is particularly directed to avoiding the damage done to a structure by the unloading of a heavy load and is of par-ticular application as a log bundle li~t because it reduces the damage done by the unloading of the heavy log bundle.
~ccordingly, the present invention is in an apparatus to move a load between a first point and a second point and comprising a carriage adapted to run along an inclined track between the two points and means to recipro-cate the carriage on the track the improvement comprising an apex in the track adjacent the second point with a por-tion of the track being between the apex and the secondpoint and directed downwardl~ towards the second point; the carriage comprising a main load bearing platform spacedly attached to a chassis generally horizontal as the carriage moves along the inclined track, th~ load bearing platform terminating adjacent the pivotal attachment of the apron;
~2a~ 6 an apron pivotally attached to the :Eront of the carriage and adapted at its leading edge to move along the track whereby, as the leading edge of the apron mo~es past the apex .in the track the apro~ pivots downwardly so that the load bearing platform and the apron form a generally con-tinuous flat surface, directly downwardly towards the second point, and down which a load may slide when the leading edge of the apron passes the apex.
In a further desirable aspect there is an inflec-tion or change in dir~ction downwardly in the track justprior to the apex.
An embodiment of the invention is illustrated in the accompanying drawings, in which:
Figure l is a side elevation of a log bundle lift according to the present invention;
Figure 2 is a further detail of a log bundle lift of Figure l, at the bottom of a track;
Figure 3 is a section along the line 3-3 in Figure 2; and Figure 4 is a perspective view of a further embo-diment of the invention.
The drawings illustrate an apparatus to move a load between a first point 2 ~see Figure 2) and a second point 4 ~see Figure l). There is an inclined track 6 bet-ween the two points and a carriage 8 is reciprocated on the track 6. There is an inflection 9 in the track just prior to an apex 10. The apex 10 is generally adjacent the second point 4. The track continues at 12 after the apex 10 to the second point 4.
The carriage 8 comprises a main load bearing B
S4~6 platform 14. There is an apron 16 pivotally attached at 17 to the front of the carriage 14. The apron is adapted adjacent its leading edge 18 to move along the track 12 by the provision of a roller 20 which, as shown in Figure 3, engages a central rail 22.
In addition to the load bearing platform 14 the carriage 8 has a chassis 24 provided with bogies 26 to engage side rails 28 of track 6 - see Figure 3. The load bearing platform 14 is spaced from and attached to the chassis 24 by the provision of beams 30 and 32. The arrange-ment is such that as the carriage 8 moves along the inclined track 6 the load bearing platform 14 is generally hori-zontal - see Figure 2. There is a restraininq device 3 attached to the trailing edge of the platform 14. This restrains the logs on the platform 14 and, in particular, means that the straps used on a log bundle as it i5 floated downstream can be removed in the water so that the logs may be lifted as a load of i.ndividual logs rather than as a log bundle.
The apron 16 is pivotally attached to the front of the carriage 8 by a hinge 36. The carriage 8 is moved up the track 6 by a winch 38. A cable 40 leads from the winch 38 around a first sheave 42 located on bracket 44 at the upper end of the track 6 around a second sheave 46 secured on a second bracket 48 on the chassis 24 and down to an adjustable tail hold 5~ on the superstructure used -to mount the track adjacent the second point 4, that is adjacent the log unloading position. The superstructure generally - f ~054~6 comprises I-beams 52 and the details will not be described fully here except to emphasize that generally speaking they may be of lighter construction than in the prior art.
The illustrated device operates as follows. At the starting position shown in Figure 2, with the winch 38 at rest, a log bundle is loaded onto load bearing platform 14. The bundle is retained on the pla~form by the restrain-ing means 34 and, because of the restraining means, if desired the conventional straps may be removed from the log bundle in the water. When the load is secured the winch 38 is operated to draw the carriage 8 up the track 6. As the leading edge of the chassis 24 passes the start of inflec-tion 9 and the leading edge 18 of the apron 16 passes over the apex 10, approaching the position shown in Yigure 1, the apron 16 pivots slowly downwardly around hinge 36 and the platform 14 tilts to assume the position shown in Figure 1.
The logs move relatively gently down the incline formed by the load bearing platform 14, the apron 16 and the upper portion 12 of the track ~.
Tension in the cables 40 is balanced by the tail hold 50.
In order to facilitate unloading it is desirable that the platform 14 and the appropriate portions of the ; track be provided wlth low friction inserts, for example plastic inserts.
It has been found that when the platform is tipped to an angle of approximately 12 the performance is excel-lent. The bundle of logs slides smoothly off the carriage ~ZC~S4~ Ei onto upper portions of the track.
It should be noted that as the carriage 8 moves up the track 12, that is as it is in the position shown in Figure 2, the apron 16 is inclined upwardly and the logs thus abut the apron 16 and not the track. The uniform line, shown in Figure 1, formed by the carriage the apron and -the upper portion of the track also ensure smooth unloading of the device.
The angle of the track is of little importance.
Track angles from 15 to 75 to the horizontal are appro-priate and, generally, whatever the terrain requires can be accommoda-ted.
The inflection 9 is not necessary. If platform 14 is inclined so that, referring to Figure 2, it is closer to being perpendicular to the track the inflection may be dispensed with. Similarly, the superstructure of I-beams 52 may be replaced by a structure of different beams or by a concrete structure.
Figure 4 illustrates an embodiment in which a 20 track 106 is formed as a channel and a carriage 108 moves on wheels within the channel. The carriage 108 is of generally similar structure to carriage 8 but is simpler. In par-ticular the replacement of bogies 26 by wheels simplifies the general structure although the wheels necessitate a channel track rather than a single rail as is possible with bo~gies. Generally carriage 108 will have -two wheels on a common axle at each corner of the carriage 108 and running in track 106.
~ igure 4 also shows in more detail a suitable ~ ~Z05~6 winch arrangement. The winch has a divided drum 110 driven by shafts 112 for a motor 114, there is a divided drum 110 on each side of the structure although only one is shown in Figure 4. Thus there are a total of four cables 116, only two of whlch are shown. Multiple sheave blocks 118 are positioned outwardly of the track 106. The sheave blocks 118 on one side of the hoist are reeved with the pair of cables 116 from the drum 110 coming over the outside sheaves and continuing back and forth over as many sheaves as is necessary to provide the required lifting force. The cables end by coming over the central two sheaves and down to an adjustable tail hold 120 that will balance the tension in the cables 116. If necessary the winch can be positioned well off to one side and, again, the lines may run over as many turn blocks as necessary.
It will be appreciated to the skilled man that there is little of invention in the notion of pulling a carriage up a track by a winch operating through cables and sheave blocks. It will also be appreciated that there are wide numbers of other systems that can be used.
Concerning the illustrated structures the apron 16 can be a pair of arms, one over each track, or a full width platform. It is merely important that the apron facilitate smooth unloading and also! to a lesser extent, reduces friction while the load is being raised.
Simllarly the main platform 14 may be a simple pair of arms or a full width platform or other configura-tions intermediàte. Again the essential feature of the invention is the pivoting apron and the actual structure of these components is the sort of information easily available to the skilled artisan.
Examples of other generally similar devices, but not necessarily used for moving log bundles, are disclosed in U.S. Patent 652,069 Achee; U.S. Patent 594,577 to Suppes which describes and claims a means for feeding a blast furnace; U.S. Patent 2,278,946 to Richard et al; U.S. Patent 1,997,217 to Hite which is concerned with a hoist to handle ~S4~16 material in a mine; ~I.S. Patent 370,678 to Brown which describes a skip-car useful in filling a furnace and U.S.
Patent 2,5~8,959 to Campbell which describes an extension ladder including a hoist that may be moved up and down the latter.
Particularly when the load is large, as in a log bundle lift, considerable stress is placed on the structure by the unloading of the logs. As the log bundle reaches the top of the track the carriage tips upwardly and the log bundle sl;des down the remainder of the track with con-siderable force. As the loads carried are many tons the structure can suffer considerably and must, in any event, be of extremely robust construction.
The present invention provides a lift that is particularly directed to avoiding the damage done to a structure by the unloading of a heavy load and is of par-ticular application as a log bundle li~t because it reduces the damage done by the unloading of the heavy log bundle.
~ccordingly, the present invention is in an apparatus to move a load between a first point and a second point and comprising a carriage adapted to run along an inclined track between the two points and means to recipro-cate the carriage on the track the improvement comprising an apex in the track adjacent the second point with a por-tion of the track being between the apex and the secondpoint and directed downwardl~ towards the second point; the carriage comprising a main load bearing platform spacedly attached to a chassis generally horizontal as the carriage moves along the inclined track, th~ load bearing platform terminating adjacent the pivotal attachment of the apron;
~2a~ 6 an apron pivotally attached to the :Eront of the carriage and adapted at its leading edge to move along the track whereby, as the leading edge of the apron mo~es past the apex .in the track the apro~ pivots downwardly so that the load bearing platform and the apron form a generally con-tinuous flat surface, directly downwardly towards the second point, and down which a load may slide when the leading edge of the apron passes the apex.
In a further desirable aspect there is an inflec-tion or change in dir~ction downwardly in the track justprior to the apex.
An embodiment of the invention is illustrated in the accompanying drawings, in which:
Figure l is a side elevation of a log bundle lift according to the present invention;
Figure 2 is a further detail of a log bundle lift of Figure l, at the bottom of a track;
Figure 3 is a section along the line 3-3 in Figure 2; and Figure 4 is a perspective view of a further embo-diment of the invention.
The drawings illustrate an apparatus to move a load between a first point 2 ~see Figure 2) and a second point 4 ~see Figure l). There is an inclined track 6 bet-ween the two points and a carriage 8 is reciprocated on the track 6. There is an inflection 9 in the track just prior to an apex 10. The apex 10 is generally adjacent the second point 4. The track continues at 12 after the apex 10 to the second point 4.
The carriage 8 comprises a main load bearing B
S4~6 platform 14. There is an apron 16 pivotally attached at 17 to the front of the carriage 14. The apron is adapted adjacent its leading edge 18 to move along the track 12 by the provision of a roller 20 which, as shown in Figure 3, engages a central rail 22.
In addition to the load bearing platform 14 the carriage 8 has a chassis 24 provided with bogies 26 to engage side rails 28 of track 6 - see Figure 3. The load bearing platform 14 is spaced from and attached to the chassis 24 by the provision of beams 30 and 32. The arrange-ment is such that as the carriage 8 moves along the inclined track 6 the load bearing platform 14 is generally hori-zontal - see Figure 2. There is a restraininq device 3 attached to the trailing edge of the platform 14. This restrains the logs on the platform 14 and, in particular, means that the straps used on a log bundle as it i5 floated downstream can be removed in the water so that the logs may be lifted as a load of i.ndividual logs rather than as a log bundle.
The apron 16 is pivotally attached to the front of the carriage 8 by a hinge 36. The carriage 8 is moved up the track 6 by a winch 38. A cable 40 leads from the winch 38 around a first sheave 42 located on bracket 44 at the upper end of the track 6 around a second sheave 46 secured on a second bracket 48 on the chassis 24 and down to an adjustable tail hold 5~ on the superstructure used -to mount the track adjacent the second point 4, that is adjacent the log unloading position. The superstructure generally - f ~054~6 comprises I-beams 52 and the details will not be described fully here except to emphasize that generally speaking they may be of lighter construction than in the prior art.
The illustrated device operates as follows. At the starting position shown in Figure 2, with the winch 38 at rest, a log bundle is loaded onto load bearing platform 14. The bundle is retained on the pla~form by the restrain-ing means 34 and, because of the restraining means, if desired the conventional straps may be removed from the log bundle in the water. When the load is secured the winch 38 is operated to draw the carriage 8 up the track 6. As the leading edge of the chassis 24 passes the start of inflec-tion 9 and the leading edge 18 of the apron 16 passes over the apex 10, approaching the position shown in Yigure 1, the apron 16 pivots slowly downwardly around hinge 36 and the platform 14 tilts to assume the position shown in Figure 1.
The logs move relatively gently down the incline formed by the load bearing platform 14, the apron 16 and the upper portion 12 of the track ~.
Tension in the cables 40 is balanced by the tail hold 50.
In order to facilitate unloading it is desirable that the platform 14 and the appropriate portions of the ; track be provided wlth low friction inserts, for example plastic inserts.
It has been found that when the platform is tipped to an angle of approximately 12 the performance is excel-lent. The bundle of logs slides smoothly off the carriage ~ZC~S4~ Ei onto upper portions of the track.
It should be noted that as the carriage 8 moves up the track 12, that is as it is in the position shown in Figure 2, the apron 16 is inclined upwardly and the logs thus abut the apron 16 and not the track. The uniform line, shown in Figure 1, formed by the carriage the apron and -the upper portion of the track also ensure smooth unloading of the device.
The angle of the track is of little importance.
Track angles from 15 to 75 to the horizontal are appro-priate and, generally, whatever the terrain requires can be accommoda-ted.
The inflection 9 is not necessary. If platform 14 is inclined so that, referring to Figure 2, it is closer to being perpendicular to the track the inflection may be dispensed with. Similarly, the superstructure of I-beams 52 may be replaced by a structure of different beams or by a concrete structure.
Figure 4 illustrates an embodiment in which a 20 track 106 is formed as a channel and a carriage 108 moves on wheels within the channel. The carriage 108 is of generally similar structure to carriage 8 but is simpler. In par-ticular the replacement of bogies 26 by wheels simplifies the general structure although the wheels necessitate a channel track rather than a single rail as is possible with bo~gies. Generally carriage 108 will have -two wheels on a common axle at each corner of the carriage 108 and running in track 106.
~ igure 4 also shows in more detail a suitable ~ ~Z05~6 winch arrangement. The winch has a divided drum 110 driven by shafts 112 for a motor 114, there is a divided drum 110 on each side of the structure although only one is shown in Figure 4. Thus there are a total of four cables 116, only two of whlch are shown. Multiple sheave blocks 118 are positioned outwardly of the track 106. The sheave blocks 118 on one side of the hoist are reeved with the pair of cables 116 from the drum 110 coming over the outside sheaves and continuing back and forth over as many sheaves as is necessary to provide the required lifting force. The cables end by coming over the central two sheaves and down to an adjustable tail hold 120 that will balance the tension in the cables 116. If necessary the winch can be positioned well off to one side and, again, the lines may run over as many turn blocks as necessary.
It will be appreciated to the skilled man that there is little of invention in the notion of pulling a carriage up a track by a winch operating through cables and sheave blocks. It will also be appreciated that there are wide numbers of other systems that can be used.
Concerning the illustrated structures the apron 16 can be a pair of arms, one over each track, or a full width platform. It is merely important that the apron facilitate smooth unloading and also! to a lesser extent, reduces friction while the load is being raised.
Simllarly the main platform 14 may be a simple pair of arms or a full width platform or other configura-tions intermediàte. Again the essential feature of the invention is the pivoting apron and the actual structure of these components is the sort of information easily available to the skilled artisan.
Claims (5)
1. In an apparatus to move a load between a first point and a second point and comprising a carriage adapted to run along an inclined track between the two points and means to reciprocate the carriage on the track the improvement comprising:
an apex in the track adjacent the second point with a portion of the track being between the apex and the second point and directed downwardly towards the second point;
the carriage comprising a main load bearing plat-form spacedly attached to a chassis generally horizontal as the carriage moves along the inclined track, the load bearing platform terminating adjacent the pivotal attach-ment of the apron;
an apron pivotally attached to the front of the carriage and adapted at its leading edge to move along the track whereby, as the leading edge of the apron moves past the apex in the track the apron pivots downwardly so that the load bearing platform and the apron form a generally continuous flat surface, directly downwardly towards the second point, and down which a load may slide when the leading edge of the apron passes the apex.
an apex in the track adjacent the second point with a portion of the track being between the apex and the second point and directed downwardly towards the second point;
the carriage comprising a main load bearing plat-form spacedly attached to a chassis generally horizontal as the carriage moves along the inclined track, the load bearing platform terminating adjacent the pivotal attach-ment of the apron;
an apron pivotally attached to the front of the carriage and adapted at its leading edge to move along the track whereby, as the leading edge of the apron moves past the apex in the track the apron pivots downwardly so that the load bearing platform and the apron form a generally continuous flat surface, directly downwardly towards the second point, and down which a load may slide when the leading edge of the apron passes the apex.
2. Apparatus as claimed in claim 1 in which there are bogies on the chassis to move along the track.
3. Apparatus as claimed in claim 1 adapted to be driven by a winch mounted near the second point;
cables extending from the winch to engage a sheave block on the carriage and an intermediate sheave block positioned on the track.
cables extending from the winch to engage a sheave block on the carriage and an intermediate sheave block positioned on the track.
4. Apparatus as claimed in claim 1 in which the load bearing platform and the apron have low friction surfaces.
5. Apparatus as claimed in claim 1 including rear stakes on the load bearing platform, remote from the tracks to maintain a load on the platform.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US38826482A | 1982-06-14 | 1982-06-14 | |
| US388,264 | 1982-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1205416A true CA1205416A (en) | 1986-06-03 |
Family
ID=23533384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000405936A Expired CA1205416A (en) | 1982-06-14 | 1982-06-24 | Log bundle side lift |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1205416A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107905572A (en) * | 2017-12-26 | 2018-04-13 | 北京首旺科技有限公司 | A kind of airport Aerial Defence Project |
-
1982
- 1982-06-24 CA CA000405936A patent/CA1205416A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107905572A (en) * | 2017-12-26 | 2018-04-13 | 北京首旺科技有限公司 | A kind of airport Aerial Defence Project |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |