CA1078793A - Driving arrangement for a cable passed about a driven guide roller - Google Patents
Driving arrangement for a cable passed about a driven guide rollerInfo
- Publication number
- CA1078793A CA1078793A CA279,986A CA279986A CA1078793A CA 1078793 A CA1078793 A CA 1078793A CA 279986 A CA279986 A CA 279986A CA 1078793 A CA1078793 A CA 1078793A
- Authority
- CA
- Canada
- Prior art keywords
- cable
- sheave
- trolley
- reversing
- drivable
- 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
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C11/00—Trolleys or crabs, e.g. operating above runways
- B66C11/16—Rope, cable, or chain drives for trolleys; Combinations of such drives with hoisting gear
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pulleys (AREA)
- Tension Adjustment In Filamentary Materials (AREA)
Abstract
Abstract of the Disclosure A cable is trained around a reversing sheave that is adapted to be driven and is preferably pulled relative to a trolley, which is movable on wheels along a track cable by traction exerted by a traction cable and a return cable. The cable is adapted to be found against the drivable reversing sheave by means of an endless flexible tensile element, which is trained around part of the drivable reversing sheave together with the cable and is trained around at least one additional reversing sheave and consists, e.g., of a belt or a side-bar chain.
Description
~.~7~793 -:
This invention relates to drive means for driving a cable which is trained around a drivable reversing sheave, particularly for pulling a tension cable relative to a trolley, which is movable on wheels along a track cable by traction exerted by a traction cable and a return cable.
Because the traction force which can be transmitted to the cable by the drivable reversing sheave depends on the friction conditions between the cable and the reversing sheave, this traction force cannot be increased beyond a certain value under given friction conditions and a given cable tension. Whereas attempte to improve the friction conditions by the provision of special liners on the reversing sheave have enabled an increase of the traction force which can be transmitted, a much larger in-crease of the traction force is often desired.
This is the case, e.g., with tree trunk conveyors, in which a trolley is movable on wheels along a track cable by traction exerted by a return cable and a traction cable, which is trained around at least one re-versing pully in the trolley, the load is suspended from that end of the traction cable which is near the trolley, and the latter can also be used to lift and lower the load, in such arrangements, no difficult is in-volved in lifting and lowering the suspended load because the weight of the load acts on that end of the traction cable which is near the trolley so that after a release of the traction cable by a drum disposed at the other end of the traction cable that end thereof which is near the trolley is pulled out of the trolley. On the other hand, difficulties arise when the unloaded traction cable is to be lowered from the trolley in order to enable the load to be connected to the traction cable. In that case the ; weight of that end portion of the traction cable which protrudes from the trolley is not sufficient to pull the traction cable which is released by the drum, even when the reversing sheave for the traction cable is driven.
This is due to the fact that the friction between the cable and the re-versing sheave is insufficient. For this reason the traction cable in such 1~8~g3 arrangement is usually pulled by hand from the trolle~ to the load to be connected although this pulling requires a relatively large eff~rt and it may be difficult on uneven ground in a forie~tto grasp that end of the traction cable which is near the trolley.
It is an object of the invention to avoid these disadvantages and so to improve drive means of the kind described first hereinbefore that large traction forces can be transmitted even when the cable is under a relatively small tension so that particularly in conveyors for handling tree trunks that end of the unloaded traction cable which is near the trolley need no longer be pulled out of the trolley by hand.
This object is accomplished in accordance with the invention in that th~ cable is adapted to be forced against the drivable reversing sheave by means of an endless flexible tensile element, which is trained around part of the drivable reversing sheave together with the cable and is trained around at least one additional reversing sheave and consists, e.g., of a belt or a side-bar chain. In this arrangement, the cable is forced against the drivable reversing sheave, so that a high friction between the cable and the reversing sheave is obtained, regardless of the tension of the cable, and the cable is constrained to follow the movement of said sheave.
As a result, that end of the traction cable which protrudes from the trolley in such an arrangement can be lowered from the trolley by means of the drivable reversing sheave even when the traction cable is unloaded. This end of the traction cable can subsequently be pulled up in the usual manner by the cable drum provided at the other end of the traction cable.
Because the force exerted by the drivable reversing sheave and the cable to move the same depends on the friction between the reversing sheave and the cable and consequently on the contact pressure force between the cable and the reversing sheave, the tensile element must be properly tensioned. For this purpose, that reversing sheave which is provided only for the tensile element may be mounted to be movable so as to increase the loop formed by the endless ten~l~e elemen~ and may be spring-loaded in that sense. Owing to this spring loading, a constant contact pressure can be en-sured so that a re-tensioning of the tensile element by separate tensioning means is not required.
The provision of a flexible endless tensile element ensures that a contact pressure force is exerted throughout the angle o wrap of the tensile element so that good friction conditions and low stresses in the cable are ensured. To provide optimum conditions in this respect, a pre-ferred feature of the invention resides in that the tensile element is provided with a groove on that side which faces the reversing pulleys and that groove, conforms to the cable in diameter and ensures a surface contact between the tensile element and the cable and consequently a uniform pressure load.
On the other hand, such groove may give rise to difficulties re-garding the guidance of the tensile element adjacent to the other reversing sheave. For this reason those reversing sheaves which are engaged only by the tensile element are provided with a guide rib, which enters the groove in the tensile element.
The reversing sheave for the cable can be driven by various means.
For instance, a separate motor may be provided. In conveyors for handling tree trunks the trolley should be as simple in structure and light in weight as possible because it cannot be rigidly mounted on a car. For this reason the reversing sheave for the traction cable is preferably driven in such arrange-ments by means of a cable drum which is mounted on the shaft carrying the reversing sheave and non-rotatably connected to said shaft by a clutch and provided with an auxiliary cable for driving the drum and the reversing sheave. In such arrangement, care must be taken that the traction cable and the auxiliary cable ~ove parallel to each other during the movement of the trolley along the traction cable because a relative movement between the auxiliary cable and the trolley might impart an unintended movement to the reversing sheave for the traction cable. To enable a compensation of length differences between the auxiliary cable and the traction cable when the latter is fixed to the trolley, it would be necessary that the cable drum for the auxiliary cable can be rotated freely relative to the reversing sheave. This is accomplished by the provision of a clutch between the shaft for the re-versing sheave and the cable drum.
In accordance with a preferred feature of the invention a simple clutch which is particularly suitable for the rough usage involved in the handling of tree trunks consists of at least one feather key, which is adapted to be axially inserted into key ways in the hub of the cable drum and in the shaft for the reversing sheave. The resulting keyed joint pro-vides a non-rotatable connection between the cable drum and the shaft for the reversing sheave and can be eliminated without difficulty in that the feather key is removed. For this purpose the feather key may be tapered to-ward that end which is the leading end during the insertion of the key.
Where a plurality of feather keys are provided the manipulation of the feather keys will be facilitated if they are secured to a plate, which is bolted to the end face of the shaft for reversing sheave and which de-sirably holds the cable drum against axial displacement.
An embodiment of the invention is shown diagrammatically and by way of example on the accompanying drawings,in which Fig. 1 shows the general arrangement of a conveyor for handling tree trunks, ; Fig. 2 is a longitudinal sectional view showing a trolley according to the invention, Fig. 3 is a top plan view showing the trolley of Fig. 2 as viewed in direction A in Fig. 2, Fig. 4 is an enlarged sectional view taken on line IV-IV in Fig. 3 and Fig. 5 is an enlarged sectional view taken on line V-V in Fig. 2 :. ..
1~7~793 ...
and showing the means for tensioning the tensile element.
Whereas the invention can be used wherever a cable is to be driven by a reversing sheave, e.g., in circulating cablewa~s and chair lifts, the invention will be explained more fully in connection with a conveyor for handling tree trunks because this application will result -in special advantages.
The conveyor shown in Fig. 1 comprises a trolle~ 1, which is supported by a track cable 2 and movable on wheels along said track cable
This invention relates to drive means for driving a cable which is trained around a drivable reversing sheave, particularly for pulling a tension cable relative to a trolley, which is movable on wheels along a track cable by traction exerted by a traction cable and a return cable.
Because the traction force which can be transmitted to the cable by the drivable reversing sheave depends on the friction conditions between the cable and the reversing sheave, this traction force cannot be increased beyond a certain value under given friction conditions and a given cable tension. Whereas attempte to improve the friction conditions by the provision of special liners on the reversing sheave have enabled an increase of the traction force which can be transmitted, a much larger in-crease of the traction force is often desired.
This is the case, e.g., with tree trunk conveyors, in which a trolley is movable on wheels along a track cable by traction exerted by a return cable and a traction cable, which is trained around at least one re-versing pully in the trolley, the load is suspended from that end of the traction cable which is near the trolley, and the latter can also be used to lift and lower the load, in such arrangements, no difficult is in-volved in lifting and lowering the suspended load because the weight of the load acts on that end of the traction cable which is near the trolley so that after a release of the traction cable by a drum disposed at the other end of the traction cable that end thereof which is near the trolley is pulled out of the trolley. On the other hand, difficulties arise when the unloaded traction cable is to be lowered from the trolley in order to enable the load to be connected to the traction cable. In that case the ; weight of that end portion of the traction cable which protrudes from the trolley is not sufficient to pull the traction cable which is released by the drum, even when the reversing sheave for the traction cable is driven.
This is due to the fact that the friction between the cable and the re-versing sheave is insufficient. For this reason the traction cable in such 1~8~g3 arrangement is usually pulled by hand from the trolle~ to the load to be connected although this pulling requires a relatively large eff~rt and it may be difficult on uneven ground in a forie~tto grasp that end of the traction cable which is near the trolley.
It is an object of the invention to avoid these disadvantages and so to improve drive means of the kind described first hereinbefore that large traction forces can be transmitted even when the cable is under a relatively small tension so that particularly in conveyors for handling tree trunks that end of the unloaded traction cable which is near the trolley need no longer be pulled out of the trolley by hand.
This object is accomplished in accordance with the invention in that th~ cable is adapted to be forced against the drivable reversing sheave by means of an endless flexible tensile element, which is trained around part of the drivable reversing sheave together with the cable and is trained around at least one additional reversing sheave and consists, e.g., of a belt or a side-bar chain. In this arrangement, the cable is forced against the drivable reversing sheave, so that a high friction between the cable and the reversing sheave is obtained, regardless of the tension of the cable, and the cable is constrained to follow the movement of said sheave.
As a result, that end of the traction cable which protrudes from the trolley in such an arrangement can be lowered from the trolley by means of the drivable reversing sheave even when the traction cable is unloaded. This end of the traction cable can subsequently be pulled up in the usual manner by the cable drum provided at the other end of the traction cable.
Because the force exerted by the drivable reversing sheave and the cable to move the same depends on the friction between the reversing sheave and the cable and consequently on the contact pressure force between the cable and the reversing sheave, the tensile element must be properly tensioned. For this purpose, that reversing sheave which is provided only for the tensile element may be mounted to be movable so as to increase the loop formed by the endless ten~l~e elemen~ and may be spring-loaded in that sense. Owing to this spring loading, a constant contact pressure can be en-sured so that a re-tensioning of the tensile element by separate tensioning means is not required.
The provision of a flexible endless tensile element ensures that a contact pressure force is exerted throughout the angle o wrap of the tensile element so that good friction conditions and low stresses in the cable are ensured. To provide optimum conditions in this respect, a pre-ferred feature of the invention resides in that the tensile element is provided with a groove on that side which faces the reversing pulleys and that groove, conforms to the cable in diameter and ensures a surface contact between the tensile element and the cable and consequently a uniform pressure load.
On the other hand, such groove may give rise to difficulties re-garding the guidance of the tensile element adjacent to the other reversing sheave. For this reason those reversing sheaves which are engaged only by the tensile element are provided with a guide rib, which enters the groove in the tensile element.
The reversing sheave for the cable can be driven by various means.
For instance, a separate motor may be provided. In conveyors for handling tree trunks the trolley should be as simple in structure and light in weight as possible because it cannot be rigidly mounted on a car. For this reason the reversing sheave for the traction cable is preferably driven in such arrange-ments by means of a cable drum which is mounted on the shaft carrying the reversing sheave and non-rotatably connected to said shaft by a clutch and provided with an auxiliary cable for driving the drum and the reversing sheave. In such arrangement, care must be taken that the traction cable and the auxiliary cable ~ove parallel to each other during the movement of the trolley along the traction cable because a relative movement between the auxiliary cable and the trolley might impart an unintended movement to the reversing sheave for the traction cable. To enable a compensation of length differences between the auxiliary cable and the traction cable when the latter is fixed to the trolley, it would be necessary that the cable drum for the auxiliary cable can be rotated freely relative to the reversing sheave. This is accomplished by the provision of a clutch between the shaft for the re-versing sheave and the cable drum.
In accordance with a preferred feature of the invention a simple clutch which is particularly suitable for the rough usage involved in the handling of tree trunks consists of at least one feather key, which is adapted to be axially inserted into key ways in the hub of the cable drum and in the shaft for the reversing sheave. The resulting keyed joint pro-vides a non-rotatable connection between the cable drum and the shaft for the reversing sheave and can be eliminated without difficulty in that the feather key is removed. For this purpose the feather key may be tapered to-ward that end which is the leading end during the insertion of the key.
Where a plurality of feather keys are provided the manipulation of the feather keys will be facilitated if they are secured to a plate, which is bolted to the end face of the shaft for reversing sheave and which de-sirably holds the cable drum against axial displacement.
An embodiment of the invention is shown diagrammatically and by way of example on the accompanying drawings,in which Fig. 1 shows the general arrangement of a conveyor for handling tree trunks, ; Fig. 2 is a longitudinal sectional view showing a trolley according to the invention, Fig. 3 is a top plan view showing the trolley of Fig. 2 as viewed in direction A in Fig. 2, Fig. 4 is an enlarged sectional view taken on line IV-IV in Fig. 3 and Fig. 5 is an enlarged sectional view taken on line V-V in Fig. 2 :. ..
1~7~793 ...
and showing the means for tensioning the tensile element.
Whereas the invention can be used wherever a cable is to be driven by a reversing sheave, e.g., in circulating cablewa~s and chair lifts, the invention will be explained more fully in connection with a conveyor for handling tree trunks because this application will result -in special advantages.
The conveyor shown in Fig. 1 comprises a trolle~ 1, which is supported by a track cable 2 and movable on wheels along said track cable
2 by traction exerted b~ a traction cable 3 and a return cable 4. Whereas the return cable 4 is fixed to the trolley 1, the traction cable 3 is trained around reversing pulleys so that an end portion S of the traction cable protrudes from the trolley and is adapted to be connected to a load, which is to be suspended from the traction cable and this end portion can be used to lift and lower the load. A winch 6 serves to pull the trolley 1 and also to lift and lower the load when the trolley is held in position, either b~ a winch 7 for the return cable 4 or by brakes on the track cable.
The unloaded end portion 5 of the traction cable cannot be lowered from the trolle~ 1 by means of the winch 6 because the weight of that end portion of the traction cable 5 which protrudes from the trolle~
20 1 is not sufficient to pull the traction cable through the trolley when the traction cable has been released by the winch 6. To enable nevertheless a lowering of the end portion 5 of the traction cableJ the latter is trained around a drivable reversing sheave 8 and around two non-driven additional reversing sheaves 9, 1OJ which ensures an angle of wrap in excess of 180. An endless side-bar chain 12 is providedJ which is also ~ trained around the driven reversing sheave 8 and around another reversing ; sheave 11 and engages the outside of the traction cable 3 where it is trained around the reversing sheave 8 so that the traction cable is forced against the reversing sheave 8 in the groove 14 thereof J which is ; 30 formed wi*h a secondary groove 13. This forcing of the traction cable 3 ~' against the reversing sheave 8 by~means of the side~bar chain 12 results in a high friction between the traction cable 3 and the reversing sheave 8 throughout the region in which the chain 12 is wrapped around the sheave 8 so that the latter can drive the traction cable 3 without slip.
To maintain the required contact pressure force under all operating conditions, the reversing sheave 11 around which the side-bar chain 12 is trained is mounted in a U-shaped member, which is biased by a set of disc springs 16 tending to increase the loop formed by the endless side-bar chain 12. These disc springs 16 bear on a holder 17, which is fixed to the housing of the trolley 1, and on a sleeve 18, which is dis-placeable relative to the trolley. The U-shaped member 15 is carried by a bolt 19, which extends through the sleeve 18 and serves to adjust the initial stress of the spings 16 by means of a nut 20, which bears on the sleeve 18 by means of a thrust bearing 21 to facilitate the turning of the nut. A
lock nut 22 is provided to maintain the adjusted initial stress of the springs.
To ensure that the side-bar chain 12 can be moved freely past the traction cable 3 which is trained around the reversing sheaves 9 and 10, these sheaves 9 and 10 are offset from the center plane of the re-versing sheaves 8 and 11, as is clearly apparent from Fig. 3. Whereas thisarrangement has the result that the traction cable 3 moves to and from the reversing sheave 8 on other than the ideal paths, this disadvantage is more than offset by the fact that this measure enables a large wrap angle of the side-bar chain 12.
In the embodiment shown by way of example, the side-bar chain 12 is formed with a groove 23 on that side which faces the reversing sheaves 8 and 11 and said groove 23 conforms to the traction cable 3 in diameter and ensures a surface contact between the traction cable 3 and the chain links, which are curved in adaptation to the reversing sheaves.
This results in a smaller s~ress on the traction cable. To guide this side-1~'78793 bar chain 12, the reversing sheave 11 has a guide rib 24, which extends in-to the groove 23 of the side-bar chain. Ih order to minimi~e the stress on the traction cable 3 adjacent to the reversing sheave 8, the side-bar chain must be moved in unison with the traction cable and the reversing sheave 8 with a minimum of slip. This will usually be accomplished with a side-bar chain of the type shown. A movement can be positively transmitted to the side-bar chain 12 by means of teeth which are provided on the reversing sheave 8 and extend laterally into the chain 12.
In the embodiment shown by way o example, the reversing sheave 8 can be driven by a cable drum 25, which is provided with an auxiliary cable 26, which can be pulled by means of a separate winch 27. The cable drum 25, which can be replaced by a separate motor, is mounted on the shaft 28 for the reversing sheave 8 and is non-rotatably connected to the shaft 28 by two feather keys 29, which engage the cable drum 25 and the shaft 28 for the reversing sheave in respective key ways 30 and 31. These feather keys 29 are connected to a plate 33, which is secured by a screw 34 to the shaft 28 at the end face thereof and serves also to hold the drum 25 against axial movement. When the drum 25 is driven by means of the winch 27 and the auxiliary cable 26 while the trolley 1 is held in position, this rotation will be transmitted to the reversing sheave 8, which will then pull the traction cable 3 because the latter is forced by the side-bar chain 12 against the reversing sheave 8 so that the ~riction is sufficient. For this reason the reversing sheave 8 can be driven to lower the end portion 5 of the traction cable from the trolley 1 even when the end portion 5 is un-loaded, provided that the traction cable has been released in sufficient ; length by the winch 6.
A relatively long operation of the conveyor may result in a difference between the free lengths of the auxiliary cable 26 and the traction cable 3. Such difference must be eliminated because it would 3Q result in a rotation of the cable drum 25 as the trolley is moved. This is ` 1~78793 accomplished in a simple manner in that the plate 33 wnth the feather keys 29 is removed and the cable drum 25 is then properly rotated relative to the reversing sheave 8.
To permit of an operation also when the traction and auxiliary cables are non-parallel, a separate motor for the reversing sheave 8 may be provided in the trolley. It is also possible to drive not only the reversing sh.eave 8 but also the reversing sheave 11. rn that case it will be desirable to associate a separate tensioning sheave with the means for tensioning the side-bar chain 12 so that the drive means need not act on a displaceably mounted sheave.
The unloaded end portion 5 of the traction cable cannot be lowered from the trolle~ 1 by means of the winch 6 because the weight of that end portion of the traction cable 5 which protrudes from the trolle~
20 1 is not sufficient to pull the traction cable through the trolley when the traction cable has been released by the winch 6. To enable nevertheless a lowering of the end portion 5 of the traction cableJ the latter is trained around a drivable reversing sheave 8 and around two non-driven additional reversing sheaves 9, 1OJ which ensures an angle of wrap in excess of 180. An endless side-bar chain 12 is providedJ which is also ~ trained around the driven reversing sheave 8 and around another reversing ; sheave 11 and engages the outside of the traction cable 3 where it is trained around the reversing sheave 8 so that the traction cable is forced against the reversing sheave 8 in the groove 14 thereof J which is ; 30 formed wi*h a secondary groove 13. This forcing of the traction cable 3 ~' against the reversing sheave 8 by~means of the side~bar chain 12 results in a high friction between the traction cable 3 and the reversing sheave 8 throughout the region in which the chain 12 is wrapped around the sheave 8 so that the latter can drive the traction cable 3 without slip.
To maintain the required contact pressure force under all operating conditions, the reversing sheave 11 around which the side-bar chain 12 is trained is mounted in a U-shaped member, which is biased by a set of disc springs 16 tending to increase the loop formed by the endless side-bar chain 12. These disc springs 16 bear on a holder 17, which is fixed to the housing of the trolley 1, and on a sleeve 18, which is dis-placeable relative to the trolley. The U-shaped member 15 is carried by a bolt 19, which extends through the sleeve 18 and serves to adjust the initial stress of the spings 16 by means of a nut 20, which bears on the sleeve 18 by means of a thrust bearing 21 to facilitate the turning of the nut. A
lock nut 22 is provided to maintain the adjusted initial stress of the springs.
To ensure that the side-bar chain 12 can be moved freely past the traction cable 3 which is trained around the reversing sheaves 9 and 10, these sheaves 9 and 10 are offset from the center plane of the re-versing sheaves 8 and 11, as is clearly apparent from Fig. 3. Whereas thisarrangement has the result that the traction cable 3 moves to and from the reversing sheave 8 on other than the ideal paths, this disadvantage is more than offset by the fact that this measure enables a large wrap angle of the side-bar chain 12.
In the embodiment shown by way of example, the side-bar chain 12 is formed with a groove 23 on that side which faces the reversing sheaves 8 and 11 and said groove 23 conforms to the traction cable 3 in diameter and ensures a surface contact between the traction cable 3 and the chain links, which are curved in adaptation to the reversing sheaves.
This results in a smaller s~ress on the traction cable. To guide this side-1~'78793 bar chain 12, the reversing sheave 11 has a guide rib 24, which extends in-to the groove 23 of the side-bar chain. Ih order to minimi~e the stress on the traction cable 3 adjacent to the reversing sheave 8, the side-bar chain must be moved in unison with the traction cable and the reversing sheave 8 with a minimum of slip. This will usually be accomplished with a side-bar chain of the type shown. A movement can be positively transmitted to the side-bar chain 12 by means of teeth which are provided on the reversing sheave 8 and extend laterally into the chain 12.
In the embodiment shown by way o example, the reversing sheave 8 can be driven by a cable drum 25, which is provided with an auxiliary cable 26, which can be pulled by means of a separate winch 27. The cable drum 25, which can be replaced by a separate motor, is mounted on the shaft 28 for the reversing sheave 8 and is non-rotatably connected to the shaft 28 by two feather keys 29, which engage the cable drum 25 and the shaft 28 for the reversing sheave in respective key ways 30 and 31. These feather keys 29 are connected to a plate 33, which is secured by a screw 34 to the shaft 28 at the end face thereof and serves also to hold the drum 25 against axial movement. When the drum 25 is driven by means of the winch 27 and the auxiliary cable 26 while the trolley 1 is held in position, this rotation will be transmitted to the reversing sheave 8, which will then pull the traction cable 3 because the latter is forced by the side-bar chain 12 against the reversing sheave 8 so that the ~riction is sufficient. For this reason the reversing sheave 8 can be driven to lower the end portion 5 of the traction cable from the trolley 1 even when the end portion 5 is un-loaded, provided that the traction cable has been released in sufficient ; length by the winch 6.
A relatively long operation of the conveyor may result in a difference between the free lengths of the auxiliary cable 26 and the traction cable 3. Such difference must be eliminated because it would 3Q result in a rotation of the cable drum 25 as the trolley is moved. This is ` 1~78793 accomplished in a simple manner in that the plate 33 wnth the feather keys 29 is removed and the cable drum 25 is then properly rotated relative to the reversing sheave 8.
To permit of an operation also when the traction and auxiliary cables are non-parallel, a separate motor for the reversing sheave 8 may be provided in the trolley. It is also possible to drive not only the reversing sh.eave 8 but also the reversing sheave 11. rn that case it will be desirable to associate a separate tensioning sheave with the means for tensioning the side-bar chain 12 so that the drive means need not act on a displaceably mounted sheave.
Claims (8)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a trolley adapted to be moved along a supporting cable by means of a traction cable and a return cable, said trolley being provided with two reversing sheaves, one of which is drivable, means for driving said drivable sheave, said traction cable in use being trained around said drivable reversing sheave, the improvement comprising an endless flexible tensile element which is trained around part of the drivable reversing sheave and is also trained around part of the other reversing sheave, and means to urge the tensile element toward the drivable reversing sheave to increase the friction between the latter and the traction cable when in position thereon.
2. A trolley as defined in claim 1, characterized in that said other reversing sheave is mounted on the trolley to be movable toward and away from the drivable sheave and is spring-loaded in a direction away from the drivable sheave.
3. A trolley as defined in claim 1, characterized in that the flexible tensile element is provided with a groove on that side which faces the reversing sheaves and that said groove is complementary in shape to part of the circumference of the traction cable.
4. A trolley as defined in claim 3, characterized in that said other reversing sheave is provided with a guide rib which is complementary in shape to the groove in said element.
5. A trolley as defined in claim 1, or 2, or 3, in which the flexible tensile element is a side-bar chain.
6. A trolley as defined in claim 1, including a cable drum mounted on a shaft carrying the drivable reversing sheave, a clutch for non-rotatably connecting the drum to said shaft, and an auxiliary cable for driving the drum and the drivable sheave.
7. A trolley as defined in claim 6, characterized in that the clutch consists of at least one feather key which is adapted to be axially inserted into a key way in a hub of the cable drum and a similar key way in said shaft.
8. A trolley as defined in claim 7, characterized in that said at least one feather key is secured to a plate which is adapted to be bolted to the end face of said shaft.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT416976A AT346030B (en) | 1976-06-08 | 1976-06-08 | DRIVE ARRANGEMENT FOR A ROPE GUIDED AROUND A DRIVABLE PULLEY |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1078793A true CA1078793A (en) | 1980-06-03 |
Family
ID=3560568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA279,986A Expired CA1078793A (en) | 1976-06-08 | 1977-06-07 | Driving arrangement for a cable passed about a driven guide roller |
Country Status (4)
| Country | Link |
|---|---|
| AT (1) | AT346030B (en) |
| CA (1) | CA1078793A (en) |
| CH (1) | CH619427A5 (en) |
| DE (1) | DE2725349A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT385494B (en) * | 1985-08-09 | 1988-04-11 | Stuefer Heinz Fa | Cable-crane trolley |
| AT396918B (en) * | 1990-03-14 | 1993-12-27 | Hinteregger Reinhold Sen | Switching device for the load-coupling device of a cable- operated crane carriage |
| CN101941647B (en) * | 2010-09-09 | 2012-09-05 | 常熟市电力机具有限公司 | High-speed hoisting tackle |
-
1976
- 1976-06-08 AT AT416976A patent/AT346030B/en not_active IP Right Cessation
-
1977
- 1977-06-04 DE DE19772725349 patent/DE2725349A1/en not_active Withdrawn
- 1977-06-06 CH CH695677A patent/CH619427A5/en not_active IP Right Cessation
- 1977-06-07 CA CA279,986A patent/CA1078793A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2725349A1 (en) | 1977-12-22 |
| CH619427A5 (en) | 1980-09-30 |
| AT346030B (en) | 1978-10-25 |
| ATA416976A (en) | 1978-02-15 |
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