|Publication number||US20080159831 A1|
|Application number||US 11/618,859|
|Publication date||Jul 3, 2008|
|Filing date||Dec 31, 2006|
|Priority date||Dec 31, 2006|
|Also published as||EP2158151A2, EP2158151A4, WO2008083154A2, WO2008083154A3|
|Publication number||11618859, 618859, US 2008/0159831 A1, US 2008/159831 A1, US 20080159831 A1, US 20080159831A1, US 2008159831 A1, US 2008159831A1, US-A1-20080159831, US-A1-2008159831, US2008/0159831A1, US2008/159831A1, US20080159831 A1, US20080159831A1, US2008159831 A1, US2008159831A1|
|Inventors||Julian W. Davis|
|Original Assignee||Davis Julian W|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (8), Classifications (13), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This patent generally relates to crane systems, and more particularly to a gantry or bridge crane that incorporates a fail-proof hold lift mechanism.
Overhead crane and lifting systems are well known and utilized in industrial environments to move and transport goods, equipment and/or materials.
The wire hoist 104 is supported by a platform or trolley 118 carried along a top rail on the surface of the transverse beams 106. The trolley 118 is configured to traverse or travel along the plane defined by the transverse beams 106. The wire hoist 104 includes drives and controllers (not shown) designed and arranged to control and monitor a plurality of wires or ropes 120. The wires 120 extend from the wire hoist 104 and engage a container C. The container C hangs from the plurality of wires 120 and can be moved in the direction of travel followed by the trolley 118 or the drive system 112, or both.
The lifting or loading capacity of the exemplary systems such as the crane system 100 may be increased and/or augmented by utilizing multiple wire hoists 104. In order to provide a high-capacity, high safety factor system, a crane system must typically be designed to support five to ten times the normal operating load. This excess load capacity is intended to ensure, that in the event of an accident or catastrophe such as, for example, a seismic or dynamic event, the load will remain secure and supported. In order to provide the necessary level of protection and redundancy in these known systems, a great deal of mechanical and electrical complexity must be incorporated into the system design. These additional systems and components, in turn, provide multiple points of potential failure that must be monitored, reinforced and/or otherwise protected. Points of failure may, among other things, include the electrical and control circuitry and wiring, the mechanical drive and lift components, and the wires utilized for supporting and lifting the container C or other loads.
It would be desirable to provide a lifting or crane system that could provide for high lifting capacity and/or failure proof hold capabilities while simultaneously utilizing a simplified mechanical and control system. These simplified systems could be utilized in critical environments in which high-capacity and failure proof hold systems are required to comply with safety and/or governmental regulations. Moreover, these simplified systems should include fewer points of failure thereby increasing the overall operational time and usability of the equipment.
Discloses herein are embodiments of a crane system that provide for high-capacity and failure proof hold operation. For example, the disclosed crane system may be configured to support a load during a seismic event that could cause the load to momentarily and dynamically increase by a factor of five to ten. One disclosed embodiment is an overheard crane system that includes a trolley which incorporates a support span and carries a drive system on the support span. The drive system may be, in turn, configured to translate the trolley between a first position and a second position. The crane system may further include a lift mechanism carried by the support span and configured to releasably translate a chain between a support position and a lift position. One exemplary lift mechanism may include a fixed latch configured to engage a first link of the chain, the fixed latch having an open position and a positive closed position, and a traveling latch movably aligned relative to the fixed latch and configured to engage a second link of the chain, the traveling latch having an open position and a positive closed position. In operation, while the fixed latch is in the open position and the traveling latch is in the positive closed position, the lift mechanism can translate between the support position and the lift position. Similarly, while the fixed latch is in the positive closed position and the traveling latch is in the open position, the lift mechanism can translate between the lift position and the support position. Thus, regardless of the direction of travel of the load or the chain, one of the latches (fixed or traveling) is always in the positive closed position thereby supporting and holding the load.
Additional features and advantages are described in, and will be apparent from, the following Detailed Description and the figures.
The crane system 200 includes a bridge or gantry 102 similar to the one discussed in connection with the crane system 100. The gantry 102 or movable gantry, in turn, supports a trolley 202 configured to carry one or more hydraulic lift mechanisms 204 (shown in an exploded perspective view in
The trolley 202 may further include a support deck 210 that spans the distance between the transverse beams 106. The support deck or support span 210 can be configured to carry the hydraulic lift mechanisms 204 and/or any control or hydraulic equipment required to operate the same. The support deck or span 210 may be fixedly attached to the trolley 202, or may be shiftable relative to the trolley structure to allow for precise positioning of the hydraulic lift mechanisms 204. The hydraulic lifts or lift mechanisms 204 may be a linear chain jack manufactured by the BARDEX CORPORATION of Goleta, Calif. The hydraulic lifts 204, in one exemplary embodiment, releasably engage a chain 212 that extends through the support deck 210. The chain 212 includes a plurality of links individually identified by the reference numeral 214. The chain 212, in turn, may be secured to a load L.
The trolley 300, as previously discussed in connection with the trolley 202, includes a support deck or support span 306. The support span 306 may be fixedly attached to the trolley 300, or alternatively may be configured to translate along the structure of the trolley 300 independently of the trolley's motion along the rail 302. The support span 306 carries a hydraulic generation and control equipment 308 and electrical control and monitoring equipment 310. For example, the hydraulic generation and control equipment 308 may include a one hundred twenty-five horsepower (125 HP) motor driving a hydraulic power unit (not explicitly shown) configured to generate fifty-two hundred pounds-per-square-inch (5,200 PSI) of oil pressure to drive the hydraulic lift 204. Regardless of the specific horsepower and pressure generation capacity of the hydraulic generation and control equipment 308, the power generated by the equipment 308 may be utilized to drive and control the lift mechanism 204. It will be understood that the hydraulic generation and control equipment 308 and/or the hydraulic power unit may be designed and selected from commercially available components and will be sized based on the design and load requirements of the crane system 200 and/or trolley 300. The hydraulic generation and control equipment 308 may further include hard-piping 312 (see
The electrical control and monitoring equipment 310 may be communicatively coupled to the hydraulic lift 204 and the hydraulic generation and control equipment 308. The electrical control and monitoring equipment 310 may include, for example, an industrial computer (not explicitly shown), sensors, proximity switches, relays, transmitters and receivers, and other command, control, and communication equipment. The electrical control and monitoring equipment 310 may further be communicatively coupled to the drive systems 112, 206. In this way, the electrical control and monitoring equipment 310 may be programmed to direct and control the movement and/or rotation of the trolley 300 and/or crane system 200. Alternatively, the electrical control and monitoring equipment 310 may be in communication with a central control room (not shown) and be configured to communicate control and movement instructions received from the same. In yet another alternative embodiment, the electrical control and monitoring equipment 310 may incorporate a Web server (not shown) that allows for equipment monitoring and control over a network such as, for example, the Internet, an intranet, a wide area network (WAN), etc.
A fixed cross arm 408 ties together a top or base portion 410 of the hydraulic cylinders 400. Similar to the traveling cross arm 406, the fixed cross arm 408 spaces apart and secures the hydraulic cylinders 400 while providing additional rigidity and stability to the overall hydraulic lift 204. Both the traveling cross arm 406 and the fixed cross arm 408 each support and carry a pair of latches, wherein each pair of latches is individually identified as traveling latches 412 and fixed latches 414, respectively. The latches 412, 414 are one-way latches which allow movement in a single direction and prevent movement in the opposite direction. In this exemplary embodiment, the latches 412, 414 allow vertical movement in the direction indicated by the arrow Al and prevent movement in the direction indicated by the arrow A2. The latches 412, 414 are mounted adjacent to a slot 416 (see
In operation, the chain 212 is oriented and aligned substantially in the direction indicated by the arrow Al and positioned through the slots 416 provided within the traveling cross arm 406 and a fixed cross arm 408, respectively. The links 214 of the chain 212 are alternately and individually engaged by the traveling latches 412 and the fixed latches 414. In particular, the fixed last 416 engages and carries an inner portion of the link 214 when the extendable rods 404 and the associated traveling cross arm 406 are translating towards an extended position, i.e., a position away from the hydraulic cylinders 400. During this movement, the fixed latches 414 do not engage the chain 212 and may be aligned substantially parallel to the direction indicated by the arrow Al. Upon reaching the extended position, the fixed latches 414 rotate or close to a position substantially perpendicular to the direction of the chain 212 and any one of the links 214. In other words, the fixed latch 414, while substantially aligned with the traveling cross arm 406, engages one of the links 214. As the hydraulic cylinders 400 reverse directions and begin to retract the extendable rods 404, the chain 212 is carried and moved in a substantially vertical direction indicated by the arrow A1. The movement of the chain 212 in a substantially vertical direction, causes the previously closed fixed latch 414, i.e., the fixed latch 414 was releasably engaged with one of the links 214 and arranged substantially perpendicular to the direction of the chain 212 and any one of the links 214, to swivel and open to a position substantially aligned in the direction indicated by the arrow A1. Thus, while the hydraulic cylinders 400 force the extendable rods 404 and associated hardware towards an extended position, the chain 212 is securely held by the latches 412 supported on the fixed cross arm 408. Similarly, while the hydraulic cylinders 400 retract the extendable rods 404 and the associated hardware, now engaged and supporting the links 214 of the chain 212, the latches 412 release the chain 212 thereby allowing free movement of the same. Thus, the chain 212 is always securely fastened and mechanically supported by one of the two sets of latches 412 and/or 414 thereby providing for a secure hold of the chain 212 and the associated load L.
In one exemplary embodiment, each hydraulic cylinder 400 may be a six inch (6″) diameter hydraulic cylinder configured to receive fifty-two hundred pounds per square inch (5,200 PSI) of hydraulic pressure from the hydraulic generation and control equipment 308. The force (F) in tons generated by this exemplary cylinder is equal to the hydraulic pressure (P) provided multiplied by the area (A=π*r̂2) of the cylinder head (in this instance area is equal to π*(3*3)) minus the area of the two inch diameter rod (in this instance area is equal to π*(1*1)) divided by two thousand pounds (2000 lbs) or P=(F*A)/2000. In this example, each hydraulic cylinder 400 is capable of pulling with a force equal to approximately sixty-five (65) tons. Thus, the two hydraulic cylinders 400 of the hydraulic lift 204 can combine to carry or move approximately one hundred and thirty (130) tons. By utilizing two or more hydraulic lifts 204, two-hundred and sixty (260) tons can be carried or moved. Alternatively, cylinders of greater or lesser area may be utilized to increase or change the capacity of the crane system 200 and trolley 300. In yet another alternate embodiment, the pressure provided by the hydraulic generation and control equipment 308 may be increased or decreased to further alter the lifting capacity of the system(s).
It should be understood that various changes and modifications to the presently preferred embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the present invention and without diminishing its intended advantages. It is therefore intended that such changes and modifications be covered by the appended claims.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8215423 *||Oct 23, 2009||Jul 10, 2012||Intelliport Corporation||Stack axle assembly and transporters having the same|
|US8739990 *||Feb 20, 2009||Jun 3, 2014||Reid Lifting Limited||Upright support for gantry|
|US8833574 *||Sep 7, 2011||Sep 16, 2014||Stephen Edward Sparrow||Gantry with suspending links|
|US9055738 *||Dec 4, 2014||Jun 16, 2015||Viking Solutions, LLC||Game lifting apparatus and method of use|
|US20110094815 *||Oct 23, 2009||Apr 28, 2011||INTELLIPORT CORPORATION of Bothell, United States of America||Stack axle assembly and transporters having the same|
|US20110132861 *||Feb 20, 2009||Jun 9, 2011||Reid Lifting Limited||Upright support for gantry|
|US20120055898 *||Sep 7, 2011||Mar 8, 2012||Stephen Edward Sparrow||Gantry with suspending links|
|CN103693575B *||Dec 4, 2013||Jul 8, 2015||国家电网公司||便携式电缆井盖板开启装置|
|U.S. Classification||414/140.3, 254/264|
|Cooperative Classification||G21D1/003, B66C17/06, B66C5/04, B66D1/60, G21C19/02, G21C19/32, G21C19/20|
|European Classification||B66C5/04, B66D1/60, B66C17/06|
|Jun 26, 2007||AS||Assignment|
Owner name: WHITING CORPORATION, ILLINOIS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DAVIS, JULIAN W, II;REEL/FRAME:019479/0841
Effective date: 20070617