CA1271449A - Steerable power drive for gantry crane - Google Patents
Steerable power drive for gantry craneInfo
- Publication number
- CA1271449A CA1271449A CA000573919A CA573919A CA1271449A CA 1271449 A CA1271449 A CA 1271449A CA 000573919 A CA000573919 A CA 000573919A CA 573919 A CA573919 A CA 573919A CA 1271449 A CA1271449 A CA 1271449A
- Authority
- CA
- Canada
- Prior art keywords
- legs
- gantry
- fixed orientation
- wheels
- longitudinal axis
- 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
- B66C19/00—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries
- B66C19/02—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries collapsible
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Handcart (AREA)
Abstract
ABSTRACT
There is described a new and improved self-propelled steerable gantry crane including an elevated load carrying beam, individually adjustable downwardly divergent pairs of legs spaced apart lengthwise of the beam proximal the ends thereof for supporting the beam, a tie rod between the lower ends of the legs to maintain and adjust the angularity between the legs and ground engaging mobile mountings for the gantry. The ground engaging mountings include a castering wheel disposed adjacent the lower end of one of each pair of the downwardly divergent legs to swivel about an upright axis perpendicular to the longitudinal axis of the tie rod, a fixed orientation wheel disposed adjacent the lower end of the other of each pair of legs to be aligned with the longitudinal axis of the tie rod, a motor operatively connected to each of the fixed orientation wheels to independently rotate the wheels in a forward or reverse direction and control means to independently actuate the motor for forward or reverse rotation of the fixed orientation wheel.
There is described a new and improved self-propelled steerable gantry crane including an elevated load carrying beam, individually adjustable downwardly divergent pairs of legs spaced apart lengthwise of the beam proximal the ends thereof for supporting the beam, a tie rod between the lower ends of the legs to maintain and adjust the angularity between the legs and ground engaging mobile mountings for the gantry. The ground engaging mountings include a castering wheel disposed adjacent the lower end of one of each pair of the downwardly divergent legs to swivel about an upright axis perpendicular to the longitudinal axis of the tie rod, a fixed orientation wheel disposed adjacent the lower end of the other of each pair of legs to be aligned with the longitudinal axis of the tie rod, a motor operatively connected to each of the fixed orientation wheels to independently rotate the wheels in a forward or reverse direction and control means to independently actuate the motor for forward or reverse rotation of the fixed orientation wheel.
Description
~2~ 9 FIELD OF THE INVENTION
The present invention relates to a load handling gantry having a beam supported at it~ ends typically by pairs of pivotally cor.nected downwardly divergent legs, and more particularly to a means for providing such gantries with a steerable power drive mechanism.
BACKGROUND OF THE INVENTION
Load handling portable ~antry cranes are well known in industry for the lifting and movement of heavy loads from one location to another within a shop or other industrial facility. A typical gantry of this sort is described in Canadian Patent 926,822. To move such ~antries from one place to another, or to turn the gantry, swivel casters are provided ad~acent the bottom of each supporting leg, and the gantries are elther manually pu3hed or pulled about, or are moved with the aid of a tractor. Such gantries may also be mounted on rails for slmple back-and-forth movement, again usually by hand, but also by means of a power driven wheel.
The manual movement of gantries can be difficult particularly when heavy loads are involved, and although this can be alleviated to a certain extent by the use of rails, freedom of movement is then lost. There can also be an element of danger from swinging loads or when trying to control the gantries when being moved.
SUMMARY OF THE INVENTION
Accordlng to one ob~ect of the present invention, it is sought to mitigate the disadvantages of prior gantries by providlng means by which the gantries can become ~elf-propelled, which means further permit the gantries to be steered within a confined space.
AcGording to the present invention, there is provided a self-propelled steerable gantry comprising: an elevated load carrying beam; individually adjustable downwardly divergent pairs of legs spaced apart lengthwise o~ the beam proximal the ends thereof for supporting the beam; tie means between the lower ends of the legs to maintain and ad~ust the angularity between the legs; the ,A
~7~
~i 2 tie means having a length whlch i3 substantially shorter than the lengtll of the beam; and gro~lnd engaging mobile mounting~ for the gantry includin~: (1) a castering wheel disposed ad~acent the lower end of one of each pair of downwardly divergent leg~ to swivel about an upright axls perpendicular to the longitudinal axis of the tie means;
The present invention relates to a load handling gantry having a beam supported at it~ ends typically by pairs of pivotally cor.nected downwardly divergent legs, and more particularly to a means for providing such gantries with a steerable power drive mechanism.
BACKGROUND OF THE INVENTION
Load handling portable ~antry cranes are well known in industry for the lifting and movement of heavy loads from one location to another within a shop or other industrial facility. A typical gantry of this sort is described in Canadian Patent 926,822. To move such ~antries from one place to another, or to turn the gantry, swivel casters are provided ad~acent the bottom of each supporting leg, and the gantries are elther manually pu3hed or pulled about, or are moved with the aid of a tractor. Such gantries may also be mounted on rails for slmple back-and-forth movement, again usually by hand, but also by means of a power driven wheel.
The manual movement of gantries can be difficult particularly when heavy loads are involved, and although this can be alleviated to a certain extent by the use of rails, freedom of movement is then lost. There can also be an element of danger from swinging loads or when trying to control the gantries when being moved.
SUMMARY OF THE INVENTION
Accordlng to one ob~ect of the present invention, it is sought to mitigate the disadvantages of prior gantries by providlng means by which the gantries can become ~elf-propelled, which means further permit the gantries to be steered within a confined space.
AcGording to the present invention, there is provided a self-propelled steerable gantry comprising: an elevated load carrying beam; individually adjustable downwardly divergent pairs of legs spaced apart lengthwise o~ the beam proximal the ends thereof for supporting the beam; tie means between the lower ends of the legs to maintain and ad~ust the angularity between the legs; the ,A
~7~
~i 2 tie means having a length whlch i3 substantially shorter than the lengtll of the beam; and gro~lnd engaging mobile mounting~ for the gantry includin~: (1) a castering wheel disposed ad~acent the lower end of one of each pair of downwardly divergent leg~ to swivel about an upright axls perpendicular to the longitudinal axis of the tie means;
(2) a fix~d orientation wheel disposed adjacent the lower end of the other of the pairs o~ legs to be aligned with the longitudinal axis of the tie means; (3) a prime mover operatively connected to each of the fixed orientation wheels to independently rotate the wheels in a forward or reverse direction; and (4) control means operable to independently actuate the prime mover means for forward or reverse rotation of the fixed orientation wheels.
RIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the present invention will now be described in greater detail and will be better understood when read in con~unction with the following drawings, in which:
Figure 1 is a front elevational view of a gantry crane including the drive mechanism of the present invention:
Figure 2 is a side elevational view of the gantry crane oE Figure 1;
Figure 3 is a side elevational view of a portion of the gantry showing the drive mechanism in greater detail;
E'igures 4a and 4b are schematical representations of the ~antry in di~ferent turning modes;
and Figure 5 i~ a wiring diagram for the gantry drive mechanism.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Load handling gantries are as aforesaid well known and will therefore be described only briefly with reference to Figures 1 and 2 illustrating a typical 5 ton portable gantry. It will be understood however that the gantry crane as shown is merely exemplary, and that the :,.~
2a drive mechani~m for gantries described herein is adaptable to gantries o~ different c~n~tructions.
" . ,.
' -.' ' ~'. - ' ' ' ' ' With reference now to Figures l and 2, it will be seen that gantry 1 comprlses a load-carrying member ~, such as an I-beam comprlsing a vertical web 3 and upper and lower longitudinally ex~ending Elanges 5 and 6. Beam 2 is suppor~ed adjacent its opposite ends by similarly structured pairs oE downwardly divergent legs 10. The legs have their upper ends connected with the beam by means o~ a cross member 12 to which each of the upper ends is pivotally connected at pivot connections 14 and 15.
The beam itsel~ is suspended erom cross member 12 by means o~ weldments, bolts or any other strong load bearing connection means. Each leg 10 comprises a -telescopically associated inner and outer sleeve 20 and 21, res~pectively, so that the length oE the legs can be independently adjusted by means of, for example, a pin (not shown) insertable through holes (also not shown) formed in the inner and outer sleeves.
The load may be suspended Erom beam 2 in any suitable manner, but is usually slung Erom an electric power hoist 25 suspended Erom a trolley 26 whose wheels 27 ride on the lower Elange 6 of beam 2 ~or travel therealong. Other accoutrements are typically associated with the hoist and trolley as will be appreciated by those skilled in the art, including a spring-loaded takeup 28 for the power supply cord, but as these features are well known, and have relatively little to do with the present inventionr further description thereoE will be delete-l.
Particularly under load conditions, the lower ends oP legs 10 will tend to spread unless restrained and it is thereEore the usua] practise to incorporate tie means 30 between the lower ends oE each pair oE legs 10.
I'he tie means may be Eor example a flexible piece oE chain or rope, but more typically, greater stability and strength is to be obtained by means oE a rigid tie bar 30 with or without length adjustlnent means. If length adjustment means are incorporated, the tie bar will usually comprise inner and outer telescopically associated sleeves (not shown) selectively adjustable for length by means of a retractable pin which cooperates with holes formed in the sleeves in much the same manner as describe~
above with :respect to the adjus-tability of legs 10. To accommodate the relative angling between legs 10 and tie bar 30, the joints between them is by means o~ horizontal pivots 31 extending through b.rackets 33 provided at the end of each leg and the adjoining portion oE ti.e bar 30 engaged ~hereby.
The combination of adjustable legs 10 and tie bar 30 permits a substantial range of independent and coordinated variation in the height and spread of the gantry which o:f course lends the versatility needed to accommodate different load sizes and weights, available clearances, and also the sur:Eace over which the gantry will travel. .
In the gantry as shown in Figures 1 and 2, legs 10 are braced by means of struts 40 respectively disposed on opposite sides o:E beam 2. The upper ends ~1 of each strut are mounted on a second cross member ~2 by means of a pivot 44. The lower end 46 of each strut 40 is coupled to its adjacent leg 10 by a simi.lar pivot ~7 :Eixed on the leg as shown schematically in Figure 1.
To provide the gantr,y as described above with mobili-ty, it has been the practice hitherto to moun~
swivel casters 50 beneath opposite ends of each tie bar 30, and to push or pull the gantry either manually or with the aid of some sort o:E tractor. It is now pro~osed to replace one oE the casters at the corresponding ends o.E
each tie bar with a power drive assembly 60 as will be described hereinafter in greater detail.
With refe:rence to Figure 3, each assembly 60 consists oE an outer (metallic) hou.sing 62 which supports an axle 63 ~or a ground-engaging d:rive wheel 65 and a prime mover 69 such as a three-phase electric motor coupled to a gear box 71 with a drive sprocket 73 extending laterally therefrom. Drive wheels 65 include a relatively large laterally disposed drive sprocket 75 aligned with and connected to drive sprocket 73 by means .
~27144~
s of a drive chain 78 ~or ro~ation o~ the drive wheel in either the forward or reverse direc-tion. ~ suitable motor/gear box combination found to provide goocl results by the applicant is a Marathon coupled to an OH10*MQ206 drivP.
To connect housing 62 to the gantr~ adjacent the lower ends oE one o each pair of legs 10, a metal ~Elange 76 is welded or bolted to the underside of tie bar 30 adjacent the respective end ther~oE to Elush fit against the upper surface of housing 62. The two surEaces are then fastened together such as by means of bolts 79 so that the housing can be removed iE requlred for replacement or repair oE the drive assembly. Each of drive wheels 65 rotates about a fixed axle and is not Eree to pivot so that when the drive assernbly is installed, the wheel is aligned with tie bar 30 to be perpendicular to the longitudinal axis oE the gantxy.
Each drive wheel is independently actuatable for separate operation in either the ~orward or reverse direction and, of course, neu-tral. An elec-trical control box 80 is connected to the gantry between one oE legs 10 and the ad~acent strut ~0 in any suitable manner. Power to the unit is input via power cord 82 and in an embodiment constructed by the applicant, three-phase 60 ~Iz AC current at either 440 or 575 volts is supplied to operate the unit. If required, the unit can be adapted to operate on a 115 or 220/1/60 power supply. Control of the drive units is preferabl~ providefl by means oE a handheld five-button pendant control 8~ held by the operator in both hands for thumb actuation of the forward and reverse buttons on each side a~ well as a stop button. The bu-ttons on each side oE the control may be colour-coded to match the colours of each of housings 62. In the wiring diagram of Figure 5, left hand wheel-drive housing is coloured yellowr whereas the right hand housing is blac]c, and on the pendant control, the respective control bu-ttons Trade Mark ' , ~%~ 9 will be coloured corresponclin~ly to provide a visual correlation Eor the operator. To provlde ~or sorne ~lac~
in the electrical cords 87 and 8~ providing power to the respective drive assemblies to accommodate adjustments to the lengths oE legs 10, a few extra loops 89 oE cord are provided in each circuit to the drive assemblies.
The electrical wiring and controls for the present gantry illus-trated in the schematic of Figure 5 will be self-evident to those skilled in the art and will not therefore be described in further detail herein, other than to indicate that the applicant has found it desirable to incorporate a micro-logic so~-t start into the circuitry to minimize load swinging at the commencement of travel.
In operationl it will be evident Erom the foregoing description tha-t in order to propel the gantry in a straight line in ei-ther -the forward or reverse directions, the operator will actuate both drive assemblies in the same direction simultaneously. Wi-th reference to Figure 4a, -the gan-try can be made to rotate about its vertical axis in a clockwise or counterclockwise direction by simultaneously actuating both drive assemblies in opposite directions. Broader radius turns may be accomplished as shown in Figure ~b by allowing one drive to idle while actuating the opposite drive in the desired direction oE the turn.
Drive wheels 65 may be standard semi-steel or urethane ground-engaging.
The principles, preferred embodiments and modes of operation and construction oE the present invention have been described in the Eoregoing disclosure. The invention which is lntended to be protected herein however is not to be construed as limited to the particular embodiments disclosed, since these embodiments are to be regarded as illustrative rather than res-trictive.
Variations and changes may be made by others without depar-ting Erom the spirit and scope oE the invention.
Accordlngly, it is expressly intended that all such variations and changes which fall within the spirit and scope o the invention be included within the scope o:E the following claim.
' ' ' ~
`
,
RIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the present invention will now be described in greater detail and will be better understood when read in con~unction with the following drawings, in which:
Figure 1 is a front elevational view of a gantry crane including the drive mechanism of the present invention:
Figure 2 is a side elevational view of the gantry crane oE Figure 1;
Figure 3 is a side elevational view of a portion of the gantry showing the drive mechanism in greater detail;
E'igures 4a and 4b are schematical representations of the ~antry in di~ferent turning modes;
and Figure 5 i~ a wiring diagram for the gantry drive mechanism.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Load handling gantries are as aforesaid well known and will therefore be described only briefly with reference to Figures 1 and 2 illustrating a typical 5 ton portable gantry. It will be understood however that the gantry crane as shown is merely exemplary, and that the :,.~
2a drive mechani~m for gantries described herein is adaptable to gantries o~ different c~n~tructions.
" . ,.
' -.' ' ~'. - ' ' ' ' ' With reference now to Figures l and 2, it will be seen that gantry 1 comprlses a load-carrying member ~, such as an I-beam comprlsing a vertical web 3 and upper and lower longitudinally ex~ending Elanges 5 and 6. Beam 2 is suppor~ed adjacent its opposite ends by similarly structured pairs oE downwardly divergent legs 10. The legs have their upper ends connected with the beam by means o~ a cross member 12 to which each of the upper ends is pivotally connected at pivot connections 14 and 15.
The beam itsel~ is suspended erom cross member 12 by means o~ weldments, bolts or any other strong load bearing connection means. Each leg 10 comprises a -telescopically associated inner and outer sleeve 20 and 21, res~pectively, so that the length oE the legs can be independently adjusted by means of, for example, a pin (not shown) insertable through holes (also not shown) formed in the inner and outer sleeves.
The load may be suspended Erom beam 2 in any suitable manner, but is usually slung Erom an electric power hoist 25 suspended Erom a trolley 26 whose wheels 27 ride on the lower Elange 6 of beam 2 ~or travel therealong. Other accoutrements are typically associated with the hoist and trolley as will be appreciated by those skilled in the art, including a spring-loaded takeup 28 for the power supply cord, but as these features are well known, and have relatively little to do with the present inventionr further description thereoE will be delete-l.
Particularly under load conditions, the lower ends oP legs 10 will tend to spread unless restrained and it is thereEore the usua] practise to incorporate tie means 30 between the lower ends oE each pair oE legs 10.
I'he tie means may be Eor example a flexible piece oE chain or rope, but more typically, greater stability and strength is to be obtained by means oE a rigid tie bar 30 with or without length adjustlnent means. If length adjustment means are incorporated, the tie bar will usually comprise inner and outer telescopically associated sleeves (not shown) selectively adjustable for length by means of a retractable pin which cooperates with holes formed in the sleeves in much the same manner as describe~
above with :respect to the adjus-tability of legs 10. To accommodate the relative angling between legs 10 and tie bar 30, the joints between them is by means o~ horizontal pivots 31 extending through b.rackets 33 provided at the end of each leg and the adjoining portion oE ti.e bar 30 engaged ~hereby.
The combination of adjustable legs 10 and tie bar 30 permits a substantial range of independent and coordinated variation in the height and spread of the gantry which o:f course lends the versatility needed to accommodate different load sizes and weights, available clearances, and also the sur:Eace over which the gantry will travel. .
In the gantry as shown in Figures 1 and 2, legs 10 are braced by means of struts 40 respectively disposed on opposite sides o:E beam 2. The upper ends ~1 of each strut are mounted on a second cross member ~2 by means of a pivot 44. The lower end 46 of each strut 40 is coupled to its adjacent leg 10 by a simi.lar pivot ~7 :Eixed on the leg as shown schematically in Figure 1.
To provide the gantr,y as described above with mobili-ty, it has been the practice hitherto to moun~
swivel casters 50 beneath opposite ends of each tie bar 30, and to push or pull the gantry either manually or with the aid of some sort o:E tractor. It is now pro~osed to replace one oE the casters at the corresponding ends o.E
each tie bar with a power drive assembly 60 as will be described hereinafter in greater detail.
With refe:rence to Figure 3, each assembly 60 consists oE an outer (metallic) hou.sing 62 which supports an axle 63 ~or a ground-engaging d:rive wheel 65 and a prime mover 69 such as a three-phase electric motor coupled to a gear box 71 with a drive sprocket 73 extending laterally therefrom. Drive wheels 65 include a relatively large laterally disposed drive sprocket 75 aligned with and connected to drive sprocket 73 by means .
~27144~
s of a drive chain 78 ~or ro~ation o~ the drive wheel in either the forward or reverse direc-tion. ~ suitable motor/gear box combination found to provide goocl results by the applicant is a Marathon coupled to an OH10*MQ206 drivP.
To connect housing 62 to the gantr~ adjacent the lower ends oE one o each pair of legs 10, a metal ~Elange 76 is welded or bolted to the underside of tie bar 30 adjacent the respective end ther~oE to Elush fit against the upper surface of housing 62. The two surEaces are then fastened together such as by means of bolts 79 so that the housing can be removed iE requlred for replacement or repair oE the drive assembly. Each of drive wheels 65 rotates about a fixed axle and is not Eree to pivot so that when the drive assernbly is installed, the wheel is aligned with tie bar 30 to be perpendicular to the longitudinal axis oE the gantxy.
Each drive wheel is independently actuatable for separate operation in either the ~orward or reverse direction and, of course, neu-tral. An elec-trical control box 80 is connected to the gantry between one oE legs 10 and the ad~acent strut ~0 in any suitable manner. Power to the unit is input via power cord 82 and in an embodiment constructed by the applicant, three-phase 60 ~Iz AC current at either 440 or 575 volts is supplied to operate the unit. If required, the unit can be adapted to operate on a 115 or 220/1/60 power supply. Control of the drive units is preferabl~ providefl by means oE a handheld five-button pendant control 8~ held by the operator in both hands for thumb actuation of the forward and reverse buttons on each side a~ well as a stop button. The bu-ttons on each side oE the control may be colour-coded to match the colours of each of housings 62. In the wiring diagram of Figure 5, left hand wheel-drive housing is coloured yellowr whereas the right hand housing is blac]c, and on the pendant control, the respective control bu-ttons Trade Mark ' , ~%~ 9 will be coloured corresponclin~ly to provide a visual correlation Eor the operator. To provlde ~or sorne ~lac~
in the electrical cords 87 and 8~ providing power to the respective drive assemblies to accommodate adjustments to the lengths oE legs 10, a few extra loops 89 oE cord are provided in each circuit to the drive assemblies.
The electrical wiring and controls for the present gantry illus-trated in the schematic of Figure 5 will be self-evident to those skilled in the art and will not therefore be described in further detail herein, other than to indicate that the applicant has found it desirable to incorporate a micro-logic so~-t start into the circuitry to minimize load swinging at the commencement of travel.
In operationl it will be evident Erom the foregoing description tha-t in order to propel the gantry in a straight line in ei-ther -the forward or reverse directions, the operator will actuate both drive assemblies in the same direction simultaneously. Wi-th reference to Figure 4a, -the gan-try can be made to rotate about its vertical axis in a clockwise or counterclockwise direction by simultaneously actuating both drive assemblies in opposite directions. Broader radius turns may be accomplished as shown in Figure ~b by allowing one drive to idle while actuating the opposite drive in the desired direction oE the turn.
Drive wheels 65 may be standard semi-steel or urethane ground-engaging.
The principles, preferred embodiments and modes of operation and construction oE the present invention have been described in the Eoregoing disclosure. The invention which is lntended to be protected herein however is not to be construed as limited to the particular embodiments disclosed, since these embodiments are to be regarded as illustrative rather than res-trictive.
Variations and changes may be made by others without depar-ting Erom the spirit and scope oE the invention.
Accordlngly, it is expressly intended that all such variations and changes which fall within the spirit and scope o the invention be included within the scope o:E the following claim.
' ' ' ~
`
,
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A self-propelled steerable gantry comprising: an elevated load carrying beam; individually adjustable downwardly divergent pairs of legs spaced apart lengthwise of said beam proximal the ends thereof for supporting said beam; tie means between the lower ends of said legs to maintain and adjust the angularity between said legs; said tie means having a length which is substantially shorter than the length of said beam; and ground engaging mobile mountings for said gantry including: (1) a castering wheel disposed adjacent the lower end of one of each pair of downwardly divergent legs to swivel about an upright axis perpendicular to the longitudinal axis of said tie means; (2) a fixed orientation wheel disposed adjacent the lower end of the other of said pairs of legs to be aligned with the longitudinal axis of said tie means; (3) a prime mover operatively connected to each of said fixed orientation wheels to independently rotate said wheels in a forward or reverse direction; and (4) control means operable to independently actuate said prime mover means for forward or reverse rotation of said fixed orientation wheels.
2. A self-propelled steerable gantry as claimed in claim 1, wherein said control means further comprises circuitry to perform a soft start of said prime mover at the commencement of travel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000573919A CA1271449A (en) | 1988-08-05 | 1988-08-05 | Steerable power drive for gantry crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000573919A CA1271449A (en) | 1988-08-05 | 1988-08-05 | Steerable power drive for gantry crane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1271449A true CA1271449A (en) | 1990-07-10 |
Family
ID=4138496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000573919A Expired CA1271449A (en) | 1988-08-05 | 1988-08-05 | Steerable power drive for gantry crane |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1271449A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659029A (en) * | 2012-04-25 | 2012-09-12 | 汪明霞 | Combined type movable hanger |
| CN103287988A (en) * | 2013-06-25 | 2013-09-11 | 苏州速腾电子科技有限公司 | A mobile gantry frame |
| WO2023156750A1 (en) * | 2022-02-18 | 2023-08-24 | Safran Landing Systems | Gantry crane and associated method of erection |
-
1988
- 1988-08-05 CA CA000573919A patent/CA1271449A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659029A (en) * | 2012-04-25 | 2012-09-12 | 汪明霞 | Combined type movable hanger |
| CN103287988A (en) * | 2013-06-25 | 2013-09-11 | 苏州速腾电子科技有限公司 | A mobile gantry frame |
| WO2023156750A1 (en) * | 2022-02-18 | 2023-08-24 | Safran Landing Systems | Gantry crane and associated method of erection |
| FR3132907A1 (en) * | 2022-02-18 | 2023-08-25 | Safran Landing Systems | LIFTING GANTRY AND ASSOCIATED ASSEMBLY METHOD |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |