CRUSHING MACHINES. 631 



The jaw-sbaft K is held iii place by wrought-irou or steel clamps (7, which serve to 

 take part of the strain due to crushing iu the upper part of the jaw space, and also 

 serve as walls thereof. In the lower part of the three-sided frame, or front part of the 

 crusher, aud on each side of it are holes iu the casting to receive the maiu tension 

 rods JB, which couuect the front and rear part of the machine. The rear part B is 

 called the main toggle block. It is also provided with holes to receive the main ten- 

 sion-rods JB JB, corresponding to those in the front casting. The tension-rods R E are 

 provided with screw-threads and nuts N N, by means of which their length, and iu 

 consequence the opening between the jaws, are readily adjusted to crush coarse or fine. 



The front and rear castings are supported on parallel timbers 6 (?, to the under 

 side of which are bolted the boxes carrying the main eccentric shaft, provided with fly- 

 wheels and pulley. These timbers take the transverse strain, which comes upon the 

 pitman connecting the main shaft aud the toggle-joint, situated in the rear of the mova- 

 ble jaw, and between it and the main toggle-block. Between the broad flanged bases 

 of the front aud rear castings aud the timbers on which they rest are placed flat 

 rubber cushions C' (7', one-fourth to three-eighths of an inch thick. Every revolution 

 of the shaft brings the toggles more nearly into line and throws the movable jaw 

 forward. It is withdrawn by the rod provided with rubber spring L. In this way a 

 short vibratory movement is communicated to the movable jaw. The pitman B' H is 

 constructed so that it can be lengthened or shortened, aud thus change the inclination 

 of the toggles 0, and consequently the length of the movable jaw J. 



The great advantage of this machine over the old style is that of possessing 

 elastic p :rts, rigid enough to allow the performance of the work desire;!, but giving 

 way under accidental strains, such as the introduction of a steel hammer between the 

 jaws. The frame A is made of timber. The best method of setting up this stone- 

 breaker is to place its frame on four timbers 15 by 15 inches, disposed as is shown 

 at X X 1 and Y. These timbers are piuned or bolted together. 



The following are the main parts of the machine aud the letters used to indicate 

 them in the drawing : 



A, timber frame. 



B, main toggle-block. 

 C' C', rubber cushions. 



D, fly-wheel. 



E, ni;i ; n puller. 



F, maiu cast-iron frame. 



G, timber supports. 

 H, pitman half- box. 

 I, cheeks. 



J, movable jaw. 

 K, jaw shaft. 



L, rubber spriug. 



L', spring rods. 



M, pitman-rod nuts. 



N N', main tension-rod nuts. 



O, toggles. 



P, jaw (chilled plates). 



R, main tension rods. 



K' H, pitman. 



R', pitman-rods. 



S, main, eccentric shaft. 



T, toggle bearings. 



The Farrel Foundry and Machine Company's Blake crusher is used a good deal 

 iii Leadville. It is constructed on very nearly the same priuciples as the Blake 

 Crusher Company's eccentric pattern. It presents the same appearance, it requires 

 the same amount of power to produce the same quantity of work in the same time, 

 and a complete description of it would be superfluous, since it answers exactly to the 

 description of the eccentric pattern. It differs from it, however, in one respect, namely 

 the substitution of a crank shaft for the eccentric shaft. 



