. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . l piece freedom to move in aplain parallel to the paper in Fig. 2,while the pivots CC give the stays andball piece freedom to swing in a planeat right angles to this. The axes ofthe pivots, of course, intersect at the ed. Fig. 4 explains the method of ap-plication on board ship. As the pipeexpands the end moves in the directionof the arrow, Fig. 4. It will be seenthat in this type the steel ring is dis-pensed with, the stays, which, for con-venience, are made double, are con-nected direct to
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . l piece freedom to move in aplain parallel to the paper in Fig. 2,while the pivots CC give the stays andball piece freedom to swing in a planeat right angles to this. The axes ofthe pivots, of course, intersect at the ed. Fig. 4 explains the method of ap-plication on board ship. As the pipeexpands the end moves in the directionof the arrow, Fig. 4. It will be seenthat in this type the steel ring is dis-pensed with, the stays, which, for con-venience, are made double, are con-nected direct to lugs on the ball making these lugs spherical, slightplay is allowed for, as in Fig. 3. The great advantage of this arrange-ment as compared with the commontelescopic expansion joint, is that itdoes away with the enormous unbal-anced thrust exerted by the slidingjoint. Often the principal strains on pipingand its joints are due to a bending ac-tion on the pipes, caused by expansionof the pipes themselves, or to separatemovement of the parts connected bythe pipe. By employing flexible con-. r!,i. HARTERS P.^TENT , JOINT. center of the ball; hence the ball pieceis free to swing in any direction andwith a minimum of friction, howeverhigh the steam pressure. Steam tightness is secured by an or-dinary stuffing box and gland, asshown, assisted by water grooves cutin a bushing, E; or, if preferred, cut inthe socket piece itself. It has beenfound an easy matter to keep this glandtight with soft packing, as there is al-ways perfect alignment, due to the factof the working surface being part ofa true sphere. A modification of the above type isshown in Figs. 3 and 4. This is de-signed to supersede the ordinary tele-scopic extension joint, and has beenused in the British Navy for this pur-pose on the destroyers Greyhound,Racehorse and Roebuck, and the first-class cruiser, Antrim, recently launch- nections such as that are here describ-ed, a lighter gauge of piping may beused.
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Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
