The Experts below are selected from a list of 147 Experts worldwide ranked by ideXlab platform
Imanol Tellitu - One of the best experts on this subject based on the ideXlab platform.
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New Molecular Devices: In Search of a Molecular Ratchet
The Journal of Organic Chemistry, 1998Co-Authors: T. Ross Kelly, And José Pérez Sestelo, Imanol TellituAbstract:The triptycene-substituted [3]- and [4]helicenes 1 and 2 were examined as possible molecular versions of mechanical Ratchets, where the triptycene serves as the Ratchet Wheel and the helicenes as pawl and spring. The syntheses of 1 and 2b are described. 1H NMR was employed to examine rotation around the triptycene/helicene single bond; at 20 °C rotation is frozen for both 1 and 2b, but the NMR of 1 revealed a plane of symmetry, indicating that 1 cannot function as a unidirectional Ratchet. In contrast, NMR revealed that, like a Ratchet, triptycyl[4]helicene 2b lacks the symmetry of 1 and has a barrier to rotation of 24.5 kcal/mol, but spin polarization transfer NMR experiments indicated the triptycene in 2b nonetheless rotates equally in both directions. That outcome is rationalized from the standpoint of thermodynamics.
Guo Wei - One of the best experts on this subject based on the ideXlab platform.
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Ratchet Wheel and Pawl Application in Disassembling and Assembling Machine of Supporting Hydraulic Cylinder of Multiple Coal Mining
Equipment Manufacturing Technology, 2011Co-Authors: Guo WeiAbstract:A disassembling and assembling equipment for a supporting hydraulic cylinder of multiple coal mining is a kind of device which is used to disassemble and assemble a supporting hydraulic cylinder of multiple coal mining in a maintenance workshop of a coal mine,it adopts a Ratchet Wheel pawl and a hydraulic motor,and has integration property in brute force disassembling,the hydraulic system provides motive power to the device which has features of big output torque,self-protection,easy operation,perfect function,rational construction,novel design,safe and reliable in operation and simple maintenance.
Cao Wei - One of the best experts on this subject based on the ideXlab platform.
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Disassembling and Assembling Equipment for a Supporting Hydraulic Cylinder of Multiple Coal Mining of Design
Mechanical & Electrical Engineering Technology, 2011Co-Authors: Cao WeiAbstract:A disassembling and assembling equipment for a supporting hydraulic cylinder of multiple coal mining is a kind of device which is used to disassemble and assemble a supporting hydraulic cylinder of multiple coal mining in a maintenance workshop of a coal mine,it adopts the hydraulic system which has big output torque with the self-preservation to provide motive power to itself,it combines a Ratchet Wheel pawl and a hydraulic motor to realize powerful disassembling a supporting cylinder which has been seized by corrosion.It is integration,easy operation,complete functions,rational construction,novel design,safe and reliable in operation and simple maintenance.It is widely used to disassemble and assemble the supporting cylinders of multiple coal mining of 360 to 600mm diameter.
Krishnpal Singh Tomar - One of the best experts on this subject based on the ideXlab platform.
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The UNI DIRECTIONAL SHAFT relates to gear
2016Co-Authors: Krishnpal Singh TomarAbstract:In several decades Technocrats used unidirectional shaft in which many gear assemblies were used, consequently which is very bulky and expensive to use in commercialization This paper is based on advanced as well as economic implementation in unidirectional shaft by using Ratchet Wheel and chain mechanism. This mechanical device is applicable to a mechanism, used especially in energy generating devices and some hand tools, consisting of a metal Wheel operating with a catch that permits motion in only one direction and carrying spring loaded pawls on flanges to engage with accompanied either of the main parts of a Ratchet device i.e. the toothed Wheel or bar, or the pawl. One shaft is coupled to other shaft by aforesaid gearings, so that the rotary movement performed either on clock wise or counterclockwise direction on input shaft will result unidirectional motion applicable in power generation and power transmission. When the wobbling movement of a floating body is connected to a rack of gears, this rack of gears will move up and down. Resulting reciprocal movement could be taken up by a pinion to generate oscillatory movement on a shaft. Such oscillatory movement is turned to unidirectional motion using this invention. Harnessing the immense wave power in the world's oceans can be part of the solution to word's energy needs. On the other hand there are numerous applications in industry requiring bidirectional motion to be converted to unidirectional motion. KeywordsRatchet Wheel & chain mechanism 2, unidirectional,bidirectional, paw
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Implementation of Uni-directional Shaft for Energy Conservation
Innovative Systems Design and Engineering, 2013Co-Authors: Krishnpal Singh TomarAbstract:In several decades Technocrats used unidirectional shaft in which many gear assemblies were used, consequently which is very bulky and expensive to use in commercialization This paper is based on advanced as well as economic implementation in unidirectional shaft by using Ratchet Wheel and chain mechanism . This mechanical device is applicable to a mechanism, used especially in energy generating devices and some hand tools, consisting of a metal Wheel operating with a catch that permits motion in only one direction and carrying spring loaded pawls on flanges to engage with accompanied either of the main parts of a Ratchet device i.e. the toothed Wheel or bar, or the pawl. One shaft is coupled to other shaft by aforesaid gearings, so that the rotary movement performed either on clock wise or counterclockwise direction on input shaft will result unidirectional motion applicable in power generation and power transmission. When the wobbling movement of a floating body is connected to a rack of gears, this rack of gears will move up and down. Resulting reciprocal movement could be taken up by a pinion to generate oscillatory movement on a shaft. Such oscillatory movement is turned to unidirectional motion using this invention. Harnessing the immense wave power in the world's oceans can be part of the solution to word's energy needs. On the other hand there are numerous applications in industry requiring bidirectional motion to be converted to unidirectional motion. Keywords Ratchet Wheel & chain mechanism 2 , unidirectional ,bidirectional, pawl 2 , wobbling 3 .
T. Ross Kelly - One of the best experts on this subject based on the ideXlab platform.
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New Molecular Devices: In Search of a Molecular Ratchet
The Journal of Organic Chemistry, 1998Co-Authors: T. Ross Kelly, And José Pérez Sestelo, Imanol TellituAbstract:The triptycene-substituted [3]- and [4]helicenes 1 and 2 were examined as possible molecular versions of mechanical Ratchets, where the triptycene serves as the Ratchet Wheel and the helicenes as pawl and spring. The syntheses of 1 and 2b are described. 1H NMR was employed to examine rotation around the triptycene/helicene single bond; at 20 °C rotation is frozen for both 1 and 2b, but the NMR of 1 revealed a plane of symmetry, indicating that 1 cannot function as a unidirectional Ratchet. In contrast, NMR revealed that, like a Ratchet, triptycyl[4]helicene 2b lacks the symmetry of 1 and has a barrier to rotation of 24.5 kcal/mol, but spin polarization transfer NMR experiments indicated the triptycene in 2b nonetheless rotates equally in both directions. That outcome is rationalized from the standpoint of thermodynamics.
