CA2135825A1 - Sling assembly for hoisting traction/motor wheel units and method - Google Patents
Sling assembly for hoisting traction/motor wheel units and methodInfo
- Publication number
- CA2135825A1 CA2135825A1 CA 2135825 CA2135825A CA2135825A1 CA 2135825 A1 CA2135825 A1 CA 2135825A1 CA 2135825 CA2135825 CA 2135825 CA 2135825 A CA2135825 A CA 2135825A CA 2135825 A1 CA2135825 A1 CA 2135825A1
- Authority
- CA
- Canada
- Prior art keywords
- high performance
- loop
- sling assembly
- slings
- axle
- 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.)
- Abandoned
Links
Landscapes
- Load-Engaging Elements For Cranes (AREA)
Abstract
A lifting sling assembly for hoisting railroad locomotive traction motor/wheel units includes a master link made of steel for example, and a first pair of loop slings secured at one end to the master link. The other end of each of the loop slings is adapted to extend around opposite ends of the axle between the respective wheel and a bearing journal box mounted on the terminal end of the axle. A second pair of loop slings are also secured to at one end to the master link and arranged to be secured at the other end to the motor housing to prevent rotation thereof during the hoisting operation.
Each of the loop slings comprises a core of high performance endless parallel fibers enclosed in a tubular abrasion resistant covering. The first pair of slings further include a cut and abrasion resistant sleeve surrounding the tubular covering over the length thereof which is adapted to engage the axle and wheel.
Each of the loop slings comprises a core of high performance endless parallel fibers enclosed in a tubular abrasion resistant covering. The first pair of slings further include a cut and abrasion resistant sleeve surrounding the tubular covering over the length thereof which is adapted to engage the axle and wheel.
Description
~135825 SLING ASSEMBLY FOR HOISTING TRACTION
11 FIFTn OF THF INVFNTION
12 The present invention relates to lifting sling 13 assemblies and more particularly to slings for lifting 14 railroad traction motors and car wheels.
15 RACKGROUND OF TH~ INVFNTION
16 Prior art lifting slings for lifting railroad 17 traction motor assemblies as illustrated in Figure 1 of 18 the drawings, comprise a pair of main cables designated 19 10 and 12. Each of the main cables is formed of several parts (i.e., eight) of strand wire rope braided together 21 and connected through thimble eyes 14 to a master link 22 16 at one end and to a steel hoist hook 18 at the other 23 end.
24 The hooks are adapted to engage the outside rim of the pair of drive wheels 19 which are mounted on the 6 shaft of the traction motor 20. A pair of auxiliary 27 wire rope cables 22 extend between the master link and 28 hooks 24 which engage eyelets in the motor casing to 29 prevent the casing from rotating relative to the wheels during the lifting operation.
31 The champher at the outer rim of the drive wheels 32 is not uniform from wheel to wheel with the result that 33 a hoist hook's purchase on the rim may be insufficient 34 on some wheels allowing the wheel assembly to fall.
1 The energy stored in the wire cables as a result of 2 elastic elongation during a lifting operation provides a 3 hazardous situation should one of the hoise hooks slip 4 off the wheel rim. The stored en-ergy when released may result very rapid movement of one or more of the cables 6 endangering any individual positioned near the traction 7 motor assembly during the lifting operation.
8 There is a need for a sling assembly and method 9 which overcomes the above problems.
SUMMARY OF T~F. INV~NTION
11 A sling assembly for hoisting railroad locomotive 12 traction motor/wheel units includes a master link and a 13 first pair of loop slings secured at one end to the 14 master link. The motor/wheel units have a pair of wheels and a motor mounted between the wheels on a 16 common axle with the axle extending beyond the wheels 17 and terminating at each end in a bearing journal box.
18 The other ends of the first pair of slings are adapted 19 to extend around opposite ends of the axle between the respective wheel and the bearing journal box. A second 21 pair of loop slings are also secured at one end to the 22 master link and at the other end to a respective hook.
23 Each hook is designed to engage an eye on the motor 24 housing to prevent rotation of the housing while the unit is being hoisted.
26 Each of the loop slings has a core of high 27 performance endless parallel fibers enclosed in a 28 tubular abrasion-resistant covering. Each loop sling of 29 the first pair also includes a cut and abrasion resistant sleeve surrounding the tubular covering over 31 the length thereof which is adapted to engage the axle 32 and wheel. The cut resistant sleeve is in the form of 33 high performance fibers woven at right angles to each 34 other and sewn between inner and outer sheets of abrasion resistant material. The high performance . _ 2135825 1 fibers have a strength-to-weight ratio within the range 2 of about 20 to 30 grams per denurs ~"GPD").
3 The construction and operation of the present 4 invention can best be understood by reference to the following description taken in conjunction with the 6 accompanying drawings.
7 BRIF.F D~SCRIPTIQN OF T~F. DRAWINGS
8 Figure 1 is a perspective view of a prior art sling 9 assembly for traction motor/wheel units;
Figure 2 is a perspective view of sling assembly 11 for such units in accordance with the invention;
12 Figure 3 is an enlarged perspective of one of the 13 axle engaging sling of Figure 2 partially broken away to 14 illustrate the core;
Figure 4 is an exploded perspective view of the 16 components of the cut proof sleeve in planar form;
17 Figure 5 is a perspective view of the sleeve of 18 Figure 3 in its assembled planar form; and 19 Figure 6 is a perspective view of the sleeve of Figure 4 wrapped around a portion of the sling.
21 D~SCRIPTION OF T~F P~FF~RED ~MRODIMF.NT
22 Referring now to the drawings and particularly to 23 Figure 2, the traction motor/wheel unit to be hoisted 24 comprises a drive wheel 30 mounted on and keyed to an axle 32. A traction motor has a rotor secured for 26 rotation with the axle and a surrounding stator ~not 27 shown) mounted within a housing 34. Each wheel has an 28 outside rim 36 which typically forms a sharp edge short 2~ time after the wheel is run on the track. The axle 32 terminates at each end in a bearing journal box 38 which 31 supplies lubricant to the locomotive/wheel bearings 32 located between the motor 34 and each wheel, e.g. at 38.
33 Each unit includes a recessed axle section 40 between 34 the inner end of the journal box and the hub 42 of the wheel.
~, 2135825 1 A first pair of loop slings 44 of high performance 2 fiber construction, to be described in more detail, 3 extend through sub-links 46 and 48 at one end and at the 4 other end pass around opposite ends of the axle 32 between the journal box 38 and the wheel hub 42 in the 6 recess 40. A master link 49 passes through the sub-7 links 46 and 48. The master link enables a crane (via a 8 hook not shown) to hoist the traction motor/wheel unit.
9 A second pair of loop slings 50 (also of high performance fiber construction) extend through sub-links 11 52 and 54 at one end and through the eyes of hooks 56 12 and 58 at the other end as illustrated. The master link 13 49 also passes through the sub-links 52 and 54. The 14 hooks 56 and 58 extend through eyes 60 on the motor housing 34. The slings 50 prevent the motor housing 16 from rotating relative to the wheels 30 during the 17 hoisting operation.
18 Referring now to Figures 3-6 each loop sling 44 19 comprises a core bundle of high performance fibers 62 twisted into parallel yarns which are wound into an 21 endless loop in a well known manner. The high 22 performance fibers have a strength to weight ratio in 23 excess of 20 GPD and preferabIy within the range of 24 about 20 to 30 GPD. Most preferably the fibers have a strength to weight ratio within the range of 23 to 27 26 GPD. Kevlar aramid and Spectra fibers provide 27 strength to weight ratio of 23 and 27 GPD, respectively, 28 and are ideally suited for the core. We have found that 29 a ~lend of Kevlar and Spectra fibers (50/50) twisted into yarns result in a core (and sling) which is easy to 31 manipulate and provides a reliable lifting element with 32 a strength to weight ratio of about 26 GPD. The yarns 33 are preferably about 1/4" in diameter. See the pending 34 application Serial No. 08/129,987 filed September 30, 1993 assigned to the assignee of this application.
The core of endless fiber yarns is encased in a 2 protective tubular covering 64 with the ends thereof 3 sewn or otherwise fastened together to form a loop 4 sling. The protective covering may be made of an abrasion or wear resistant material such as Cordura.
6 Kevlar and Cordura are trademarks of E.I. Dupont 7 Nemours, and Spectra is a trademark of Allied Signal.
8 Such high performance fibers have a maximum stretch of 9 about .0001% at rated load and are about 90% lighter than steel with a comparable lifting capacity. The 11 diameter of the tubular covering is chosen to restrain 12 any movement of the fiber yarns therein. The overall 13 diameter of the sling may run about three to four inches 14 to provide a lifting capacity which will allow the entire weight of the traction motor!wheel unit i.e., 16 about 12,500 pounds to be suspended by either sling.
17 A cut proof or cut resistant sleeve 66 surrounds 18 the tubular protective covering 64 along the closed 19 curve section which extends around the axle and the wheel 30 to prevent the sharp edge 36 of the wheel rim 21 from penetrating into the protective covering 64 and the 22 high performance fibers 62.
23 The cut proof sleeve 66 is made up of inner and 24 outer abrasion or wear resistant panels 68 and an inner panel 70 consisting of multiple layers of a high 26 performance fibers and particularly Spectra fibers woven 27 at right angles. The high performance fiber panel 70 is 28 sewn between the panels 68 along longitudinally 29 extending lines 72 as shown. The composite panel layers are them wrapped around the tubular protective covering 31 64 to form the cut proof sleeve 66. The edges of the 32 composite panel layers are then stitched together at 74.
33 The cross woven high performance fibers 70 will 34 accommodate a needle to provide the stitching 72 but 35 will resist penetration by a larger object. The ~135825 1 longitudinal stitches 72 hold the multiple high 2 performance fibers in place inside the cut proof 3 sleeves. The outer abrasion resistent covering panel 4 68, which may be made of Cordura, protects the high performance fiber layers from abrasion damage and thus 6 extends the life of the sling.
7 The loop slings 50 are constructed in the same 8 manner as the slings 44 without the cut resistant sleeve 9 66. The master link 49 is preferably made of 1 1/4"
diameter steel and the sub-links are made of 3/4' 11 diameter steel.
12 The loop slings 44 are non-abrading and soft as 13 compared with steel and will not damage the journal box 14 or axle. In contrast wire rope slings cannot be 15 positioned over the axle as illustrated in Figure 2 for 16 hoisting the motor wheel units because the wire will 17 generally damage the journal box. In addition to 18 providing a safe system and method for hoisting traction 19 motor/wheel units, the loop sling assembly of the 20 present invention weighs only about fifty pounds as 21 compared with a weight of over 300 pounds for steel 22 slings having the same configuration. In should be 23 noted that the loop sling assembly of the present 24 invention may also be used to hoist railroad car wheel 25 units per se (without the traction motor) by the use of 26 slings 44 above and without the motor anti-rotation 27 slings 50. It should be noted that a sling assembly 28 designed for hoisting car wheels need only have a 29 fraction of the load lifting capacity of an assembly 30 designed for traction motor/wheel units.
31 There has thus been described a unique lightweight 32 loop sling assembly for lifting railroad traction motor 33 wheel units while eliminating many of the hazards common 34 to the use of the prior art wire rope sling 35 arrangements. Various modifications of the described ~135825 -, 1 preferred embodiment will be apparent to those skilled 2 in the art without involving any departure from the 3 spirit and scope of our invention as defined in the 4 appended claims.
11 FIFTn OF THF INVFNTION
12 The present invention relates to lifting sling 13 assemblies and more particularly to slings for lifting 14 railroad traction motors and car wheels.
15 RACKGROUND OF TH~ INVFNTION
16 Prior art lifting slings for lifting railroad 17 traction motor assemblies as illustrated in Figure 1 of 18 the drawings, comprise a pair of main cables designated 19 10 and 12. Each of the main cables is formed of several parts (i.e., eight) of strand wire rope braided together 21 and connected through thimble eyes 14 to a master link 22 16 at one end and to a steel hoist hook 18 at the other 23 end.
24 The hooks are adapted to engage the outside rim of the pair of drive wheels 19 which are mounted on the 6 shaft of the traction motor 20. A pair of auxiliary 27 wire rope cables 22 extend between the master link and 28 hooks 24 which engage eyelets in the motor casing to 29 prevent the casing from rotating relative to the wheels during the lifting operation.
31 The champher at the outer rim of the drive wheels 32 is not uniform from wheel to wheel with the result that 33 a hoist hook's purchase on the rim may be insufficient 34 on some wheels allowing the wheel assembly to fall.
1 The energy stored in the wire cables as a result of 2 elastic elongation during a lifting operation provides a 3 hazardous situation should one of the hoise hooks slip 4 off the wheel rim. The stored en-ergy when released may result very rapid movement of one or more of the cables 6 endangering any individual positioned near the traction 7 motor assembly during the lifting operation.
8 There is a need for a sling assembly and method 9 which overcomes the above problems.
SUMMARY OF T~F. INV~NTION
11 A sling assembly for hoisting railroad locomotive 12 traction motor/wheel units includes a master link and a 13 first pair of loop slings secured at one end to the 14 master link. The motor/wheel units have a pair of wheels and a motor mounted between the wheels on a 16 common axle with the axle extending beyond the wheels 17 and terminating at each end in a bearing journal box.
18 The other ends of the first pair of slings are adapted 19 to extend around opposite ends of the axle between the respective wheel and the bearing journal box. A second 21 pair of loop slings are also secured at one end to the 22 master link and at the other end to a respective hook.
23 Each hook is designed to engage an eye on the motor 24 housing to prevent rotation of the housing while the unit is being hoisted.
26 Each of the loop slings has a core of high 27 performance endless parallel fibers enclosed in a 28 tubular abrasion-resistant covering. Each loop sling of 29 the first pair also includes a cut and abrasion resistant sleeve surrounding the tubular covering over 31 the length thereof which is adapted to engage the axle 32 and wheel. The cut resistant sleeve is in the form of 33 high performance fibers woven at right angles to each 34 other and sewn between inner and outer sheets of abrasion resistant material. The high performance . _ 2135825 1 fibers have a strength-to-weight ratio within the range 2 of about 20 to 30 grams per denurs ~"GPD").
3 The construction and operation of the present 4 invention can best be understood by reference to the following description taken in conjunction with the 6 accompanying drawings.
7 BRIF.F D~SCRIPTIQN OF T~F. DRAWINGS
8 Figure 1 is a perspective view of a prior art sling 9 assembly for traction motor/wheel units;
Figure 2 is a perspective view of sling assembly 11 for such units in accordance with the invention;
12 Figure 3 is an enlarged perspective of one of the 13 axle engaging sling of Figure 2 partially broken away to 14 illustrate the core;
Figure 4 is an exploded perspective view of the 16 components of the cut proof sleeve in planar form;
17 Figure 5 is a perspective view of the sleeve of 18 Figure 3 in its assembled planar form; and 19 Figure 6 is a perspective view of the sleeve of Figure 4 wrapped around a portion of the sling.
21 D~SCRIPTION OF T~F P~FF~RED ~MRODIMF.NT
22 Referring now to the drawings and particularly to 23 Figure 2, the traction motor/wheel unit to be hoisted 24 comprises a drive wheel 30 mounted on and keyed to an axle 32. A traction motor has a rotor secured for 26 rotation with the axle and a surrounding stator ~not 27 shown) mounted within a housing 34. Each wheel has an 28 outside rim 36 which typically forms a sharp edge short 2~ time after the wheel is run on the track. The axle 32 terminates at each end in a bearing journal box 38 which 31 supplies lubricant to the locomotive/wheel bearings 32 located between the motor 34 and each wheel, e.g. at 38.
33 Each unit includes a recessed axle section 40 between 34 the inner end of the journal box and the hub 42 of the wheel.
~, 2135825 1 A first pair of loop slings 44 of high performance 2 fiber construction, to be described in more detail, 3 extend through sub-links 46 and 48 at one end and at the 4 other end pass around opposite ends of the axle 32 between the journal box 38 and the wheel hub 42 in the 6 recess 40. A master link 49 passes through the sub-7 links 46 and 48. The master link enables a crane (via a 8 hook not shown) to hoist the traction motor/wheel unit.
9 A second pair of loop slings 50 (also of high performance fiber construction) extend through sub-links 11 52 and 54 at one end and through the eyes of hooks 56 12 and 58 at the other end as illustrated. The master link 13 49 also passes through the sub-links 52 and 54. The 14 hooks 56 and 58 extend through eyes 60 on the motor housing 34. The slings 50 prevent the motor housing 16 from rotating relative to the wheels 30 during the 17 hoisting operation.
18 Referring now to Figures 3-6 each loop sling 44 19 comprises a core bundle of high performance fibers 62 twisted into parallel yarns which are wound into an 21 endless loop in a well known manner. The high 22 performance fibers have a strength to weight ratio in 23 excess of 20 GPD and preferabIy within the range of 24 about 20 to 30 GPD. Most preferably the fibers have a strength to weight ratio within the range of 23 to 27 26 GPD. Kevlar aramid and Spectra fibers provide 27 strength to weight ratio of 23 and 27 GPD, respectively, 28 and are ideally suited for the core. We have found that 29 a ~lend of Kevlar and Spectra fibers (50/50) twisted into yarns result in a core (and sling) which is easy to 31 manipulate and provides a reliable lifting element with 32 a strength to weight ratio of about 26 GPD. The yarns 33 are preferably about 1/4" in diameter. See the pending 34 application Serial No. 08/129,987 filed September 30, 1993 assigned to the assignee of this application.
The core of endless fiber yarns is encased in a 2 protective tubular covering 64 with the ends thereof 3 sewn or otherwise fastened together to form a loop 4 sling. The protective covering may be made of an abrasion or wear resistant material such as Cordura.
6 Kevlar and Cordura are trademarks of E.I. Dupont 7 Nemours, and Spectra is a trademark of Allied Signal.
8 Such high performance fibers have a maximum stretch of 9 about .0001% at rated load and are about 90% lighter than steel with a comparable lifting capacity. The 11 diameter of the tubular covering is chosen to restrain 12 any movement of the fiber yarns therein. The overall 13 diameter of the sling may run about three to four inches 14 to provide a lifting capacity which will allow the entire weight of the traction motor!wheel unit i.e., 16 about 12,500 pounds to be suspended by either sling.
17 A cut proof or cut resistant sleeve 66 surrounds 18 the tubular protective covering 64 along the closed 19 curve section which extends around the axle and the wheel 30 to prevent the sharp edge 36 of the wheel rim 21 from penetrating into the protective covering 64 and the 22 high performance fibers 62.
23 The cut proof sleeve 66 is made up of inner and 24 outer abrasion or wear resistant panels 68 and an inner panel 70 consisting of multiple layers of a high 26 performance fibers and particularly Spectra fibers woven 27 at right angles. The high performance fiber panel 70 is 28 sewn between the panels 68 along longitudinally 29 extending lines 72 as shown. The composite panel layers are them wrapped around the tubular protective covering 31 64 to form the cut proof sleeve 66. The edges of the 32 composite panel layers are then stitched together at 74.
33 The cross woven high performance fibers 70 will 34 accommodate a needle to provide the stitching 72 but 35 will resist penetration by a larger object. The ~135825 1 longitudinal stitches 72 hold the multiple high 2 performance fibers in place inside the cut proof 3 sleeves. The outer abrasion resistent covering panel 4 68, which may be made of Cordura, protects the high performance fiber layers from abrasion damage and thus 6 extends the life of the sling.
7 The loop slings 50 are constructed in the same 8 manner as the slings 44 without the cut resistant sleeve 9 66. The master link 49 is preferably made of 1 1/4"
diameter steel and the sub-links are made of 3/4' 11 diameter steel.
12 The loop slings 44 are non-abrading and soft as 13 compared with steel and will not damage the journal box 14 or axle. In contrast wire rope slings cannot be 15 positioned over the axle as illustrated in Figure 2 for 16 hoisting the motor wheel units because the wire will 17 generally damage the journal box. In addition to 18 providing a safe system and method for hoisting traction 19 motor/wheel units, the loop sling assembly of the 20 present invention weighs only about fifty pounds as 21 compared with a weight of over 300 pounds for steel 22 slings having the same configuration. In should be 23 noted that the loop sling assembly of the present 24 invention may also be used to hoist railroad car wheel 25 units per se (without the traction motor) by the use of 26 slings 44 above and without the motor anti-rotation 27 slings 50. It should be noted that a sling assembly 28 designed for hoisting car wheels need only have a 29 fraction of the load lifting capacity of an assembly 30 designed for traction motor/wheel units.
31 There has thus been described a unique lightweight 32 loop sling assembly for lifting railroad traction motor 33 wheel units while eliminating many of the hazards common 34 to the use of the prior art wire rope sling 35 arrangements. Various modifications of the described ~135825 -, 1 preferred embodiment will be apparent to those skilled 2 in the art without involving any departure from the 3 spirit and scope of our invention as defined in the 4 appended claims.
Claims (18)
1. In a sling assembly for hoisting railroad locomotive traction motor/wheel units, each unit having a pair of wheels and a traction motor housing mounted between the wheels on a common axle, the axle extending beyond each of the wheels and terminating at each end in a bearing journal box, the combination comprising:
a master link;
a first pair of loop slings secured at one end to the master link, the other end of each loop sling being adapted to extend around a respective end of the axle between the journal box and the wheel;
a second pair of loop slings secured at one end to the master link;
a hook individually secured to the other end of each of the second pair of loop slings;
each hook being adapted to engage an eye on the motor housing to prevent rotation of the housing while the unit is being hoisted;
each of the loop slings comprising a core bundle of high performance endless parallel fibers enclosed in a tubular abrasion resistant covering, each of the first pair of loop slings further including a cut and abrasion resistant sleeve surrounding the loop sling at least over the length thereof which is adapted to engage the axle and the wheel, the cut resistant sleeve comprising a sheet of high performance fibers woven at right angles and sewn between inner and outer sheets of abrasion resistant material, the high performance fibers of each of the first and second loop slings and the cut resistant sleeve having a strength-to-weight ratio within the range of about 20 to 30 GPD.
a master link;
a first pair of loop slings secured at one end to the master link, the other end of each loop sling being adapted to extend around a respective end of the axle between the journal box and the wheel;
a second pair of loop slings secured at one end to the master link;
a hook individually secured to the other end of each of the second pair of loop slings;
each hook being adapted to engage an eye on the motor housing to prevent rotation of the housing while the unit is being hoisted;
each of the loop slings comprising a core bundle of high performance endless parallel fibers enclosed in a tubular abrasion resistant covering, each of the first pair of loop slings further including a cut and abrasion resistant sleeve surrounding the loop sling at least over the length thereof which is adapted to engage the axle and the wheel, the cut resistant sleeve comprising a sheet of high performance fibers woven at right angles and sewn between inner and outer sheets of abrasion resistant material, the high performance fibers of each of the first and second loop slings and the cut resistant sleeve having a strength-to-weight ratio within the range of about 20 to 30 GPD.
2. The sling assembly of claim 1 wherein each of the first pair of loop slings are individually secured to the master link by a sub-link.
3. The sling assembly of claim 2 wherein each of the second pair of loop slings are individually secured to the master link by a sub-link.
4. The sling assembly of claim 3 wherein the endless fiber yarns and the tubular abrasion resistant sleeve of each of the first and second loop slings extend through a respective sub-link.
5. The sling assembly of claim 2 wherein each of the hooks include a closed eye and wherein the endless fiber years and the tubular abrasion resistant sleeve of each of the second loop slings extend through the eye of a respective hook.
6. The sling assembly of claim 5 wherein the high performance fibers have a strength-to-weight ratio between 23 and 27 GPD.
7. The sling assembly of claim 6 wherein the high performance fibers of the core bundle are chosen from the group consisting of Spectra and Kevlar.
8. The sling assembly of claim 7 wherein the high performance fibers in the core bundle are a blend of Spectra and Kevlar fibers woven into a yarn.
9. The sling assembly of claim 8 wherein the high performance fibers of each of the cut proof sleeves are made of Spectra.
10. A method of hoisting a railroad locomotive traction motor/wheel unit having a pair of wheels and a traction motor housing mounted between the wheels on a common axle, the axle extending beyond each of the wheels and terminating at each end in a bearing journal box spaced from the respective wheel with a sling assembly having first and second high performance fiber loop slings secured at one end to a master link and third and fourth high performance fiber loop slings secured at one end to the master link and secured at the other end to a hook comprising:
a) placing the other end of each of the first and second loop slings around the axle between the respective wheel and the journal box;
a) placing the other end of each of the first and second loop slings around the axle between the respective wheel and the journal box;
11 b) securing each of the hooks attached to the ends of the third and fourth loop slings to the motor housing to prevent the housing from rotating relative to the axle;
and c) lifting the master link to thereby lift the unit.
11. The method of claim 10 wherein the high performance fibers of each of the loop slings has a strength-to-weight ratio within the range of about 20 to 30 GPD.
and c) lifting the master link to thereby lift the unit.
11. The method of claim 10 wherein the high performance fibers of each of the loop slings has a strength-to-weight ratio within the range of about 20 to 30 GPD.
12. In a sling assembly for hoisting railroad car wheel units, each unit having a pair of wheels mounted on a common axle, the axle extending beyond each of the wheels and terminating at each end in a bearing journal box, the combination comprising:
a master link;
a pair of loop slings secured at one end to the master link, the other end of each loop sling being adapted to extend around a respective end of the axle between the journal box and the wheel;
each of the loop slings comprising a core bundle of high performance endless parallel fibers enclosed in a tubular abrasion resistant covering, and further including a cut and abrasion resistant sleeve surrounding the loop sling at least over the length thereof which is adapted to engage the axle and the wheel, the cut resistant sleeve comprising a sheet of high performance fibers woven at right angles and sewn between inner and outer sheets of abrasion resistant material, the high performance fibers of each of the loop slings and the cut resistant sleeve having a strength-to-weight ratio within the range of about 20 to 30 GPD.
a master link;
a pair of loop slings secured at one end to the master link, the other end of each loop sling being adapted to extend around a respective end of the axle between the journal box and the wheel;
each of the loop slings comprising a core bundle of high performance endless parallel fibers enclosed in a tubular abrasion resistant covering, and further including a cut and abrasion resistant sleeve surrounding the loop sling at least over the length thereof which is adapted to engage the axle and the wheel, the cut resistant sleeve comprising a sheet of high performance fibers woven at right angles and sewn between inner and outer sheets of abrasion resistant material, the high performance fibers of each of the loop slings and the cut resistant sleeve having a strength-to-weight ratio within the range of about 20 to 30 GPD.
13. The sling assembly of claim 12 wherein each of the loop slings are individually secured to the master link by a sub-link.
14. The sling assembly of claim 13 wherein the endless fiber yarns and the tubular abrasion resistant sleeve of each of the loop slings extend through a respective sub-link.
15. The sling assembly of claim 14 wherein the high performance fibers have a strength-to-weight ratio between 23 and 27 GPD.
16. The sling assembly of claim 15 wherein the high performance fibers of the core bundle are chosen from the group consisting of Spectra and Kevlar.
17. The sling assembly of claim 16 wherein the high performance fibers in the core bundle are a blend of Spectra and Kevlar fibers woven into a yarn.
18. The sling assembly of claim 17 wherein the high performance fibers of each of the cut proof sleeves are made of Spectra.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/295,204 | 1994-08-24 | ||
| US08/295,204 US5492383A (en) | 1993-09-30 | 1994-08-24 | Sling assembly for hoisting traction motor/wheel units and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2135825A1 true CA2135825A1 (en) | 1996-02-25 |
Family
ID=23136704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2135825 Abandoned CA2135825A1 (en) | 1994-08-24 | 1994-11-15 | Sling assembly for hoisting traction/motor wheel units and method |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2135825A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009135792A1 (en) * | 2008-05-05 | 2009-11-12 | Unitex Holding B.V. | Device for lifting a load |
| CN107444996A (en) * | 2017-09-01 | 2017-12-08 | 中交第航务工程局有限公司 | A kind of large-scale component sling system and hanging method |
-
1994
- 1994-11-15 CA CA 2135825 patent/CA2135825A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009135792A1 (en) * | 2008-05-05 | 2009-11-12 | Unitex Holding B.V. | Device for lifting a load |
| WO2009135502A1 (en) * | 2008-05-05 | 2009-11-12 | Unitex Holding B.V. | Device for lifting a load |
| CN107444996A (en) * | 2017-09-01 | 2017-12-08 | 中交第航务工程局有限公司 | A kind of large-scale component sling system and hanging method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5492383A (en) | Sling assembly for hoisting traction motor/wheel units and method | |
| ES2200459T3 (en) | DEVICE FOR RECOGNIZING THE SPARE STATE FOR WEAR OF SYNTHETIC FIBER CABLES. | |
| JP4021938B2 (en) | Non-metallic synthetic rope for elevator | |
| US7240475B2 (en) | Roundsling | |
| US5688011A (en) | Lifting sling system having single strap with size-varying, spaced, in-line eye loops | |
| US5415449A (en) | Draw bar sling | |
| KR101088325B1 (en) | Rope of synthetic fibre with reinforcement element for frictionally engaged power transmission and rope of synthetic fibre with reinforcement element for positively engaged power transmission | |
| JP2009520659A (en) | High durability round sling | |
| PL177759B1 (en) | Hoisting rope | |
| FI119233B (en) | A method of replacing the elevator rope | |
| CN107720573B (en) | Lightweight flexible tensioning system for construction equipment | |
| CA2135825A1 (en) | Sling assembly for hoisting traction/motor wheel units and method | |
| EP0525856B1 (en) | Guiding bow | |
| NO320737B1 (en) | Rope control and combination of artificial fiber rope and steering element as well as rope drive with such rope control | |
| GB1578858A (en) | Wire-rope with load-carrying core fibres | |
| AU2021236536B1 (en) | A safety assembly securing a tipping tray in a raised position | |
| CN2270715Y (en) | Flexable hoist cable | |
| CN217810199U (en) | Rope with lock catch | |
| GB2340101A (en) | Helicopter endless rope winch system | |
| CN220056010U (en) | Protective flexible sling structure for bridge construction | |
| CN218842720U (en) | Composite braided cable with inner core and sheath capable of being connected in nesting mode | |
| CA2134146A1 (en) | Draw bar sling | |
| JP2023010693A (en) | Rope grab device for portable type power driving system | |
| JPH0726399Y2 (en) | Tugboat rope | |
| RU2230143C2 (en) | Lifting system incorporating tension member and usage of tension member fo r transmitting of upward force to lifting system cabin |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |