

AND DESIGN 



XIII. CROSS Ml VDS 



An c\:uii{l< of a steam-engine cross-head is shown m 

 fig.55. A is the end >f the piston rod whi. h pad upon it 



ad B. The cross-head pin shown at (tl), tig. ;._ 

 to \\hirh the connecting rod is attached, works in th* U-aring 

 C. Projecting pieces D, forged on tli- i l>ottoin of the 



cross-head, carry the slide blocks K \vhi.-h work on tin -li.l.- 

 bars, an<l tliu> u'ui<lr tin- motion of the piston rod. 



_4__i ;u .A 



__.,__ ..^|c... 



I'm. 65. 



EXERCISE 56 : Locomotive Cross-head. In lig. 56 are shown 

 side and end elevations, partly in section, of the cross h< id and 

 slide h locks for an outside cylinder locomotive* Draw these 

 half size, showing also on the end elevation the cross-head pin and a 

 vertical section of the connecting rod end from fig. 52. The bush 

 in the cross-head which forms the bearing for the cross-head j-in is 

 of wrought iron, case-hardened, and is prevented from rotating 1>\ the 

 key shown. The cross-head is of wrought iron, and the slide blocks 

 are of cast iron, and are fitted with white metal strips as show n. A 

 short brass tube leads oil from the upper slide block into a i 

 the cross-head as shown, which carries it to a slot in the bush 

 which distributes it over the cross-head pin. 



