Pin&joints 200607
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A cotter joint connects two rods subjected to tensile or compressive stress along their axes. It uses a tapered, rectangular steel cotter that is inserted through slots in the ends of the rods at a high angle to their axes. The cotter pulls the rods tightly together and its tapered shape and narrow ends facilitate installation and removal. A gib and cotter joint is similar but used for rods with square or rectangular cross sections, with a gib added that is like a cotter but has heads on both ends. These joints are not suitable when the rods are subjected to rotation.
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The document discusses cotter joints, which use a flat wedge-shaped piece of steel to connect two rods transmitting axial motion without rotation. Cotter joints can experience tensile or compressive forces and are used in connections like piston rods and valve rods. A typical cotter joint involves one rod fitting into a socket in another rod, with a cotter driven into slots in both parts to rigidly connect them. The document provides parameters for a cotter joint and examples of failures, but does not give the failure equations. It also provides an example problem to design a cotter joint supporting a load ranging from 30 kN in compression to tension.
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The document discusses screw thread nomenclature and types. It defines key thread terms like major diameter, minor diameter, pitch diameter, pitch, and flank. It describes common thread forms like ISO metric, British Standard Whitworth, V-thread, buttress thread, square thread, ACME thread, and worm thread. It explains how to designate thread sizes using the diameter-pitch combination and abbreviations for different profiles. Finally, it shows representations of internal and external threads and examples of hexagonal and square nuts.
Unit 5 Design of Threaded and Welded Joints
1) The document discusses different types of threaded and welded joints. It describes various threaded fasteners like bolts, studs, screws and their characteristics.
2) For threaded joints subjected to eccentric loads, it explains how to calculate the primary and secondary shear forces on each bolt. This involves finding the center of gravity of the bolt system and determining the forces based on the load direction.
3) Sample problems are included to demonstrate how to select the bolt size based on the maximum resultant shear force and required factor of safety. Calculations are shown for eccentrically loaded bolted joints with the load in the plane of bolts.
Implant screw plate
The document provides an overview of plates and screws used in orthopedic surgery. It discusses the different parts and types of screws, including cortical screws, cancellous screws, and locking screws. It also describes the mechanical functions of plates, including neutralization plates, compression plates, and buttress plates. The document outlines the features and uses of various plate systems, such as the dynamic compression plate (DCP), limited contact-DCP (LC-DCP), reconstruction plates, and one-third tubular plates. It also introduces locking compression plates (LCP), which provide angular stability through the locking head of the screw instead of friction between the plate and bone.
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Pin&joints 200607
- 1. Knuckle joint Two or more rods subjected to tensile and compressive forces are fastened together Their axes are not in alignments but meet in a point The joint allows a small angular moment of one rod relative to another It can be easily connected and disconnected Applications: Elevator chains, valve rods, etc
- 4. Cotter joints • A cotter joints is a flat wedge link piece of steel of rectangular cross section which is inserted through the rods at high angle to their axes .It is uniform in thickness but tapering in width , generally on one side only. Usually the taper is 1 in 30. when a special arrangement like a set-screw is provided for keeping the cotter from slackening ,its taper may be as large as 1 in 7. the end of the cotter are made narrow to facilitate the hammering for fixing and removing. • cotter joins are generally use to fasten rigidly two rod s which is subjected to tensile or compressive stress along their axes. this joint is used to connect two circular rods. • This joint in not suitable where the member are subjected under rotation. • Thus they differ from key joints which are used to fasten shaft and hubs subjected to tensional stress:
- 5. Cotter joint Cotter joints with socket and spigot ends for circular bars Slots are wider than the cotter. Cotter pulls the rod and socket tightly together Clearance: must be provided for adjustment.(2 to 3 mm) Proportions cotter thickness = (1/3)diameter of rod cotter width = rod diameter
- 6. Cotter joint
- 7. Sleeve and cotter joint The enlarged ends of the rods butt against each other with a common sleeve over them •The rod ends are enlarged to take care of the weakening effect caused by slots For circular rods
- 8. Cotter joint with a gib • Gib and cotter joints are used for rods of square or rectangular cross section .the end of one rod fits the end of the other rod which is made in the form of a strap. A gib is used along with the cotter to make this joint. Gib is likely a cotter but with two gib heads at its ends . The thickness of the gib and cotter are same.
- 9. Gib and cotter joint for rectangular rods One bar end is made in the form of a strap A Gib is used along with the cotter. Gib is like a cotter but with two gib heads at its ends . The thickness of the gib and cotter are same
- 10. Gib and cotter joint or rectangular rods