WO2014105862A1 - High capacity conveyor trolley and method - Google Patents

High capacity conveyor trolley and method Download PDF

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Publication number
WO2014105862A1
WO2014105862A1 PCT/US2013/077588 US2013077588W WO2014105862A1 WO 2014105862 A1 WO2014105862 A1 WO 2014105862A1 US 2013077588 W US2013077588 W US 2013077588W WO 2014105862 A1 WO2014105862 A1 WO 2014105862A1
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WO
WIPO (PCT)
Prior art keywords
trolley
conveyor
load
inch
wheels
Prior art date
Application number
PCT/US2013/077588
Other languages
French (fr)
Inventor
Charles C. Frost
Original Assignee
Frost Tech Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Frost Tech Llc filed Critical Frost Tech Llc
Publication of WO2014105862A1 publication Critical patent/WO2014105862A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61B—RAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
    • B61B3/00—Elevated railway systems with suspended vehicles

Definitions

  • the present invention relates to overhead conveyors, which typically comprise at !easi as
  • T-beam track I trolleys 2 which have opposed wheels 3 engaging the bottom flanges of said 1- beam track 1 on opposite sides of the center web of the beam, and a dri vers conveyor chain (not shown) connected to said trolleys ai spaced intervals (FIG. 1 ),
  • the chains usually comprise center links alternating with a pair of side links, which overlap the end of the center link on the opposite si des thereof, and ate joined to the center link by a pin passing through the overlapping ends of the side links and center links.
  • trolleys are numbered in accordance with the approximate height of the I-beam, or C channel tracks they are carried on. Industry standards, and longstanding industry practice call for 3 inch tracks, 4 inch tracks and 6 inch tracks. Thus, there- have long been 3 inch trolleys, 4 inch trolleys and 6 inch trolleys.
  • the present invention comprises an overhead conveyor, components therefor and method for making same, in ' which the conveyor trolley is designed for a channel having a height "X," hut is built, with a maxim&ro allowable load value whic is equal to or greater than the maximum allowable load value for a trolley used, in channels of " height greater than X.
  • the trolley of the present inventio ut lizes load wheels having double row ' bearings.
  • FIG. i is a lateral cross sectional view of a prior art power and free trolley arrangement
  • FIG. 2 is a lateral cross sectional view of a power and free trolley arrangement made in accordance with a preferred embodiment of the. invention
  • FIG. 3 is a side perspective view of a four inch trolley in accordance with, the preferred embodiment, with the dog .mechanism not shown;
  • Fit ⁇ . 4 is a top plan view of view of a four inch trolley in accordance with the preferred embodiment with the dog mechanism not shown;
  • FIG. 5 is a lateral cross sectional view of double row bearing wheel for use as a load wheel.
  • FIG. 6 is a side eievational view of the wheel of FIG. 5;
  • FIG, 7 is an exploded cross sectional, view of a doable row bearing wheel for use as a load wheel in a preferred embodiment trolley .
  • FIG, 8 is a lateral cross sectional view of double row bearing wheel for use as a guide wheel in a preferred embodiment trolley.
  • Trolleys 10a of the preferred embodiment comprises a pair of spaced side plates 50a joined by bolts S I a (FIGS. 3 and 4), A pair of load wheels 20a are mounted to each side plate 50a, facing outwardly from each side of trolley 10a. Load wheels 20 a travel on the bottom flanges 41a of channel shaped tracks 40a (FIG. 2), Guide wheels 30a are mounted on vertically oriented axels, located between side plates 50a (FIGS, 2-4). Guide -wheels 30a project beyond side plates 50a on each side of trolley 10a, and have an outside diameter just slightly less than the space between the inwardly facing, spaced edges of the bottom flanges 41 a of opposed channel tracks 40a. Dogs 1 1 a are retractable by a conventional mechanism, such that trolleys 10a can be disengaged from pushers mounted on the power trolleys 2 or on the power chain carried by and driving the power trolleys 2.
  • load wheels 20a have a double row of bearings 22a and 22b, positioned next to and parallel to one another within the confines of wheel 20a (FIGS. 5 and 7).
  • Bearings 22a are located in the inside, or proximate ro w of bearings, that is the ro w facing a trolley side plate 50a, while bearings 22b are located in the outside, or distal row of bearings which faces away from a trolley side plate 50a
  • This additional, row of bearings significantly increases the overall load capacity of load wheel 20a, Each wheel 20a.
  • a proximate inner race defining ring 23a and a distal inner race defining ring 23b are inserted into wheel 20a from opposite sides, so as to abut one * another and trap the bearings 22a between the inner races 23a and b, and the outer races, 21 a and b, respecti vely .
  • Inner race rings 23a and b are carried on hub 27, which includes an inside lip 27a, which locks proximate inner race 23a in place when the components are assembled.
  • a similar outer lip 27b is then swaged on the outside edge of hub 27 to lock distal inner ring 23b in place.
  • the interior of hub 27 has a diameter to accept a wheel axel, which is at least 25% greater than the standard 5/8 inch axel of prior art-trolley wheels. more preferably 50% greater (3/4 to .1 inch in diameter), Hub covers 5 and 26 cover the opposite sides of each load wheel 20.
  • each preferred embodiment load wheel is wider than the tracking surface on the prio art wheels on a correspondingly sized trolley.
  • FIG. 2 shows the preferred embodiment wheel tracking surface to be 100% wider than the tracking surface of prior art wheels on a correspondingly sized trolley. .
  • the trolley wheels 22a of the preferred embodiment are- also preferably from 5 to 20%, more preferably from 10 to 15% less in mean outside diaterrorismer than the standard 2.4 inch diameter wheels used on 3 inch trolleys (i.e. 1 ,9-2,3, preferably 2.0-2,2 inches instead of 2.4), and the. standard 3.2-3,3 inch diameter wheels used on the 4 inch (i.e. 2.5-3,0. preferably 2,7-2.9 inches) and the standard 4.0-5.25 inch wheels used on 6 inch, trolleys (i.e. 3.2-3.8 inches, preferably 3.4- 3.6 inches).
  • the use of smaller outside diameter wheels is surprisingly made possible by the use of doable row bearings.
  • the decreased size of the load wheel allows for the use of smaller C- ehannels, saving significant materials.
  • the trolley guide wheels 30a also preferably employ a double row of bearings 32a and b, which significantly increase the overall load capacity of the wheel.
  • bearings 32a are proximate, facing up toward the bottom of trolley 10a.
  • Bearings 31 b are distal and will face down away from the bottom of trolle 10a, when the guide wheels are installed.
  • the guide wheels 30a are of similar construction, to the load wheels, excep that the exterior of the guide wheel itself arcs outwardly slightly from side to side.
  • load wheels 22a have generally flat outer surfaces, inclined slightly to match the incline of the track -flanges 41 a on which they ride.
  • Each wheel 30a is formed on it interior to define an Inwardly opening proximate outer race
  • a proximate inner race defining ring 33a and a distal inner race defining ring 33b are inserted into wheel 30a from opposite sides, so as to abut one another and trap the bearings 32a between the inner races 33a and b, and the outer races, 31 a and b, respectively.
  • Inner race rings 33a and b are carried on hub 37, which includes an inside Hp 37a, which locks proximate: inner race 33a in place when the components are assembled.
  • a similar outer lip bob is then swaged on the outside edge of hub 37 to lock distal, inner ring 33b in place.
  • the two substantially parallel side-plates 50a are connected preferably by at least grade 8 bolts 5.1a, rather than by grade 5 bolts as are conventionally uses. These plates are preferably at least .1 S% thicker than prior art 3/8 inch thick trolley side-plates, and more preferably, at least 25% greater (7/16 to 1 /2 of an inch).
  • the channel strengths as determined by pounds of material per foot of track are 50-75% greater than standard strengths.

Abstract

An. overhead conveyor, components therefor and method for making same, in which the conveyor trolley utilizes load wheels having double row bearings, and is designed for a channel having a height "X," but is built with a maximum allowable load value which is equal to or greater than the maximum allowable load value for a trolley used in channels of height greater than X.

Description

HIGH CAPACITY CONVEYOR TROLLEY AND METHOD
FIELD AND BACKGROUND OF THE INVENTION
10001] The present application claims priority to United States Provisional application Serial 'No.
61/747,172, filed December 28, 2012, entitled HIGH CAPACITY CONVEYOR TROLLEY AND METHOD. and United States Provisional application Serial No. 61/764 ,774, filed February 14, 2013, entitled
HIGH CAPACITY CONVEYOR TROLLEY A ND METHOD.
[0002] The present invention relates to overhead conveyors, which typically comprise at !easi as
"T-beam" track I, trolleys 2 which have opposed wheels 3 engaging the bottom flanges of said 1- beam track 1 on opposite sides of the center web of the beam, and a dri vers conveyor chain (not shown) connected to said trolleys ai spaced intervals (FIG. 1 ), The chains usually comprise center links alternating with a pair of side links, which overlap the end of the center link on the opposite si des thereof, and ate joined to the center link by a pin passing through the overlapping ends of the side links and center links. When the trolleys are thus drive by a chain, they are referred to as power trolleys.
[CKMB] While power trolleys are sometimes used directly to convey whatever items ate being processed, they are .more typically used to drive free trolleys 10, which travel freely on p i ed, laterally spaced load wheels 20 running on d e lower flanges 41 of spaced inwardl facing ''C!> shaped tracks 40. Two horizontally oriented guide wheels 30 at die bottom of each tree trolley are positioned between the€ channel flanges 41 , to help keep trolley 10 from shitting too far to the right or left as they travel in tracks 40,
[0004 j The C channel (racks- are supported by a pair of support arms 5, mounted atop the I-beam
1 and depending downwardly past either side thereof and past either side of the power trolleys. Downwardly depending pushers (not shown) are mounted on. either the power trolleys I or the chain carried by and dri ving the power trolleys, for engaging dogs 1 1 on the free trolleys, to thereby move the free trolleys 10 along in thei tracks 40, When it is desired to stop a trolley, mechan sms are provided for retracting either the pushers or the dogs 11„ so that the trolley stops. The so called free trolleys thus carry the heavy loads which are to he moved from place to place. The trolley and siC track arrangement can be used as powered trolleys driven by a drive chain. However, this arrangement is typically used as a set of free trolleys.
[0005] In accordance with long standing industry practice, trolleys are numbered in accordance with the approximate height of the I-beam, or C channel tracks they are carried on. Industry standards, and longstanding industry practice call for 3 inch tracks, 4 inch tracks and 6 inch tracks. Thus, there- have long been 3 inch trolleys, 4 inch trolleys and 6 inch trolleys.
[ΘΘΘ6] Also by long recognized industry standards, the so called free trolleys (which, can be drivsn) are built to carry heavier loads than the so-called driven trolleys. The free trolleys come in a standard grade and a heavier grade for carrying heavier loads. These loads are in accordance with long recognized standards. Thus the heavy load capacities for 3, 4 and 6 inch free trolleys are;
3 inch free trolley 800 #
4 inch free trolley 2,000 #
6 inch free trolley 4,000 #
SUMMARY OF' THE INVENTION
[0007] The present invention comprises an overhead conveyor, components therefor and method for making same, in 'which the conveyor trolley is designed for a channel having a height "X," hut is built, with a maxim&ro allowable load value whic is equal to or greater than the maximum allowable load value for a trolley used, in channels of "height greater than X. The trolley of the present inventio ut lizes load wheels having double row 'bearings.
[0008] This surprising departure from industry standards makes it possible to use, for example, four inch trolleys and four inch tracks, to care a load normally requiring six inch trolleys and six inch tracks.
BRIEF DESCRIPTION OF THE DRAWINGS
|0OO9] FIG. i is a lateral cross sectional view of a prior art power and free trolley arrangement;
[0010] FIG. 2 is a lateral cross sectional view of a power and free trolley arrangement made in accordance with a preferred embodiment of the. invention;
I'OOli] FIG. 3 is a side perspective view of a four inch trolley in accordance with, the preferred embodiment, with the dog .mechanism not shown;
[0012] Fit}. 4 is a top plan view of view of a four inch trolley in accordance with the preferred embodiment with the dog mechanism not shown;
10013] FIG. 5 is a lateral cross sectional view of double row bearing wheel for use as a load wheel. in a preferred embodiment trolley:
[0014] FIG. 6 is a side eievational view of the wheel of FIG. 5;
[0015] FIG, 7 is an exploded cross sectional, view of a doable row bearing wheel for use as a load wheel in a preferred embodiment trolley .
[0016] FIG, 8 is a lateral cross sectional view of double row bearing wheel for use as a guide wheel in a preferred embodiment trolley.
DETAILED .DESCRIPTION Of THE PREFERRED EMBODIMENT
[0017] Trolleys 10a of the preferred embodiment comprises a pair of spaced side plates 50a joined by bolts S I a (FIGS. 3 and 4), A pair of load wheels 20a are mounted to each side plate 50a, facing outwardly from each side of trolley 10a. Load wheels 20 a travel on the bottom flanges 41a of channel shaped tracks 40a (FIG. 2), Guide wheels 30a are mounted on vertically oriented axels, located between side plates 50a (FIGS, 2-4). Guide -wheels 30a project beyond side plates 50a on each side of trolley 10a, and have an outside diameter just slightly less than the space between the inwardly facing, spaced edges of the bottom flanges 41 a of opposed channel tracks 40a. Dogs 1 1 a are retractable by a conventional mechanism, such that trolleys 10a can be disengaged from pushers mounted on the power trolleys 2 or on the power chain carried by and driving the power trolleys 2.
[00.18] Instead of a single row of bearing wheels conventionally used in conveyor trolleys, load wheels 20a have a double row of bearings 22a and 22b, positioned next to and parallel to one another within the confines of wheel 20a (FIGS. 5 and 7). Bearings 22a are located in the inside, or proximate ro w of bearings, that is the ro w facing a trolley side plate 50a, while bearings 22b are located in the outside, or distal row of bearings which faces away from a trolley side plate 50a This additional, row of bearings significantly increases the overall load capacity of load wheel 20a, Each wheel 20a. is formed on its interior to define an inwardly opening proximate outer race 21 and an outwardly opening distal outer race 21c, separated by a shared outer race wall 21b. A proximate inner race defining ring 23a and a distal inner race defining ring 23b are inserted into wheel 20a from opposite sides, so as to abut one* another and trap the bearings 22a between the inner races 23a and b, and the outer races, 21 a and b, respecti vely . Inner race rings 23a and b are carried on hub 27, which includes an inside lip 27a, which locks proximate inner race 23a in place when the components are assembled. A similar outer lip 27b is then swaged on the outside edge of hub 27 to lock distal inner ring 23b in place. The interior of hub 27 has a diameter to accept a wheel axel, which is at least 25% greater than the standard 5/8 inch axel of prior art-trolley wheels. more preferably 50% greater (3/4 to .1 inch in diameter), Hub covers 5 and 26 cover the opposite sides of each load wheel 20.
0019] As can be seen by comparing the prior art trolley of FIG. 1 to the preferred embodiment trolley of FIG. 2, the outer tracking surface of each preferred embodiment load wheel is wider than the tracking surface on the prio art wheels on a correspondingly sized trolley. Specifically, FIG. 2 shows the preferred embodiment wheel tracking surface to be 100% wider than the tracking surface of prior art wheels on a correspondingly sized trolley. .
Ό02Θ] The trolley wheels 22a of the preferred embodiment are- also preferably from 5 to 20%, more preferably from 10 to 15% less in mean outside dianieier than the standard 2.4 inch diameter wheels used on 3 inch trolleys (i.e. 1 ,9-2,3, preferably 2.0-2,2 inches instead of 2.4), and the. standard 3.2-3,3 inch diameter wheels used on the 4 inch (i.e. 2.5-3,0. preferably 2,7-2.9 inches) and the standard 4.0-5.25 inch wheels used on 6 inch, trolleys (i.e. 3.2-3.8 inches, preferably 3.4- 3.6 inches). The use of smaller outside diameter wheels is surprisingly made possible by the use of doable row bearings. The decreased size of the load wheel allows for the use of smaller C- ehannels, saving significant materials.
0021] The trolley guide wheels 30a also preferably employ a double row of bearings 32a and b, which significantly increase the overall load capacity of the wheel. (FIG, 8} For purposes of discussion, bearings 32a are proximate, facing up toward the bottom of trolley 10a. Bearings 31 b are distal and will face down away from the bottom of trolle 10a, when the guide wheels are installed. The guide wheels 30a are of similar construction, to the load wheels, excep that the exterior of the guide wheel itself arcs outwardly slightly from side to side. In contrast, load wheels 22a have generally flat outer surfaces, inclined slightly to match the incline of the track -flanges 41 a on which they ride. [Θ022] Each wheel 30a is formed on it interior to define an Inwardly opening proximate outer race
31a and ars outwardly opening distal outer race 31b, separated by a shared outer race wall 31c. A proximate inner race defining ring 33a and a distal inner race defining ring 33b are inserted into wheel 30a from opposite sides, so as to abut one another and trap the bearings 32a between the inner races 33a and b, and the outer races, 31 a and b, respectively. Inner race rings 33a and b are carried on hub 37, which includes an inside Hp 37a, which locks proximate: inner race 33a in place when the components are assembled. A similar outer lip bob is then swaged on the outside edge of hub 37 to lock distal, inner ring 33b in place.
[0023] The two substantially parallel side-plates 50a are connected preferably by at least grade 8 bolts 5.1a, rather than by grade 5 bolts as are conventionally uses. These plates are preferably at least .1 S% thicker than prior art 3/8 inch thick trolley side-plates, and more preferably, at least 25% greater (7/16 to 1 /2 of an inch).
[0024] In a preferred embodiment, the channel strengths as determined by pounds of material per foot of track, are 50-75% greater than standard strengths.
[0025j
Figure imgf000008_0001
{0026] The benefits of the present invention have not at all been recognized or thought of by prior artisans, The use of at least double-row bearings in the load and guide wheels significantly- increases the load capacity of the trolley without increasing the size of the trolley or track. This allows, for instance, loads iradiiionally carried only by a 6-iach trolley on a 6-inch track to be carried on a 4-inch track and trolley. Further reduction to the amount of materials needed for tracks is achieved by reducing the axial height of the load wheels,
f'0027} For example, on 4 inch trolley has been load tested to 23,800 pounds without breakage.
The preferred embodiment trolleys can be comfortably rated to twice the standard loads given for prior art trolleys of the same size:
Free Trolley Size Prior Art Lead. Preferred Embodiment
Mating Load Ra ing
3 inch free trolley S00# 1600# or higher
4 inch free trolle 2000 # 4000# or higher 6 inch free trolley 4,000# 8000.# or higher
[0828] Other embodiments of the invention are contemplated by the inventor.

Claims

1. A conveyor trolley comprising: a body and a set of load wheels mounted on said body; said trolley body and said load wheels being dimensioned to be carried in a conveyor ci i e! having a height "X," but having an allowable load value which is equal to or greater than the maximum allowable load value for a trolley used in channels of height greater than X.
2. The conveyor trolley of claim 1 comprising; said trolley load wheels having double row bearings.
3. The conveyor trolley of claim 1 comprising: a 3 inch trolley having a load capacity of at least 1600 pounds.
4. The conveyor trolley of claim 1 comprising: a 4 inch trolley having a load capacity of at least 4000 pounds.
5. The conveyor trolley of claim 1 comprising: a 6 inch trolley having a load capacity of at least 8000 portnds.
6. The conveyor troHey of claim 1 comprising: said load wheels having an outer tracking surface which is -generally flat and inclined slightl to match the incline of the track flanges on which the load wheels will ride.
7. The conveyor trolley of claim 6 comprising: each said load wheel having an outer tracking surface which is wider than the outer tracking surface on prior art. wheels for a correspondingly sized trolley ,
8. The conveyor trolley of claim. 6 in which said trolley body comprises two steel side-plates, each having a thickness of 7/16 to .1/2 of an inch.,
9. The conveyor trolley of claim 1 comprising: a 3 inch trolley having -a wheel diameter of 2.0-2.2
10. The conveyor trolley of claim 1 comprising: a 4 .inch trolley having a wheel diameter of
2.7-2.9 inches.
.1 .1. The conveyor trolley of claim 1 comprising: a 6 inch trolley having a wheel, diameter of 3.2-3,8 inches.
12, A conveyor trolley comprising: a body and. a sot of load wheels mounted on said body: each of said load wheels having a double row of bearings positioned next to and parallel to one another within the confines of said load wheel; and said load wheels having an. outer tracking surface which is flal and inclined slightly to match the incline of the track flanges on which the load wheels will ride.
13. The conveyor trolley of claim 12 comprising: each said load wheel having an outer tracking surface which, is wider than the outer tracking surface on prior an wheels for a correspondingly sized trolley.
14. The conveyor trolley of claim 13 comprising: a 3 inc trolley having a wheel diameter of 2,0-2,2 inches,
15. The conveyor trolley of claim 13 comprising: a 4 inch trolley having a wheel diameter of 2.7-2.9 Inches.
16. The conveyor trolley of claim 13 comprising: a 6 inch trolley having a wheel diameter of 3.2-3 J inches.
17. The conveyor trolley of claim 12 comprising: a 3 inch trolley having a wheel diameter of
1.9-23.
18. The conveyor trolle of claim 12 comprising: a 4 inch, trolley having a wheel diameter of 2,5-3.0 inches.
19. The conveyor trolley of claim. 1:2 comprising: a 6 inch trolley having a wheel diameter of 3.2-3.8 indies .
20. The conveyor trolley of claim 12 in which, said trolley body comprises two steel side-plates, each having a thickness of 7/1.6 to .1/2 of an inch,
21. An overhead conveyor comprising: a trolley having a body and. a set of load wheels mounted on said body; said trolley body and said load wheels being dimensioned to be carried in a conveyor channel having a height "X." but having an allowable load value which is equal to or greater than the maximum allowable load value for trolley used in channels of height greater than X; and a channel for carrying said trolley, wherein the channel strength as determined by pounds of material per foot of track, are 50-75% greater than standard CEMA strengths for a channel of height X, as set forth in the table bel w:
Trolley CEMA Strength Claimed
Channel Standards Strengths
3" !-Beam 5.7 lbs/ foot 8.5-10 lbs/ foot
4" i-Beam 7.7 lbs/ foot 11.5-13.5 lbs/ foot
6" l-Beam 12.5 lbs/ foot 18.7-21.8 lbs foot
3" C-Channei 4.1 lbs/ foot 5.1-7.2 lbs/ foot
4" C-Channei 5.4 lbs/ foot 8.1-9.5 lbs/ foot
6" C-Channel 105 lbs/ foot 15.7-18.4 lbs/ foot
22. The conveyor trolley of claim 21 comprising: said trolley load wheels ha ving double row bearings.
23. The co veyor trolley of claim 22 comprising: said load wheels having an outer tracking surface which is generally fiat and inclined slightl to match the incline of the track flanges on which the load wheels will ride.
24. The conveyor trolley of claim 23 comprising: each said load wheel having an outer tracking surface which is wider than the outer tracking surface on prior art wheels for a correspondingly sized trolley.
25. The conveyor trolley of claim 24 comprising: axels on said load wheels of 3/4 to 1 inch in diameter.
PCT/US2013/077588 2012-12-28 2013-12-23 High capacity conveyor trolley and method WO2014105862A1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US201261747172P 2012-12-28 2012-12-28
US61/747,172 2012-12-28
US201361764774P 2013-02-14 2013-02-14
US61/764,774 2013-02-14
US14/139,387 US20140182476A1 (en) 2012-12-28 2013-12-23 High capacity conveyor trolley and method
US14/139,387 2013-12-23

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US9321465B1 (en) * 2014-10-08 2016-04-26 Jose Cazares Child walker track system
EP3428094B1 (en) * 2016-10-24 2022-12-07 CRRC Yangtze Co., Ltd. Multimodal transport interworking system
CN107354830A (en) * 2017-06-20 2017-11-17 中建空列（北京）科技有限公司 External suspension type rail beam and external suspension type sky iron traffic system
CN108301260A (en) * 2018-04-02 2018-07-20 中唐空铁集团有限公司 A kind of novel air rail road and application thereof

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US2978992A (en) * 1959-07-16 1961-04-11 Mechanical Equipment Co Inc Truck for underhung type overhead crane
US3268062A (en) * 1964-10-07 1966-08-23 Gladstone Ben Overhead conveyer trolley
US3627595A (en) * 1970-03-09 1971-12-14 John M Leach Enclosed track overhead cable conveyors
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US8157113B2 (en) * 2006-09-12 2012-04-17 Stahl Cranesystems Gmbh Hoisting device with extended load range

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