CRUSHING MACHINES. 631 



The jaw-sbalt iL is held iu place by wroughtiiou or steel claiui>s C, which serve to 

 take part of the straiu due to crusliing iu the upper ])art of the jaw space, and also 

 serve as walls thereof. Iu the lower ])artof the three-sided frame, or front part of the 

 crusher, aud ou each side of it are holes iu the castiug to receive the maiu teusiou 

 rods li, which couuect the frout aud rear part of the machine. The rear part B is 

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

 siou-rods E B, correspoudiug to those iu the frout castiug. The teusiourods R R are 

 provided with screw-threads aud nuts JV" N, by means of which their length, aud iu 

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



The frout and rear castings are supported ou parallel timbers G, to the under 

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

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

 pitman connecting the maiu shaft and the togglejoiut, situated iu the rear of the mova- 

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

 of the frout aud rear castings aud the timbers ou which they rest are placed flat 

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

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

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 It is withdrawn by the rod i)rovided with rubber spring L. In this way a 

 short vibratory movement is communicated to the movable jaw. The pitman R' His 

 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 desired, but giving 

 way uuder 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- 

 bieaker is to place its frame ou four timbers 15 by 15 inches, disposed as is shown 

 at XX' aud 1'. These timbers are pinned or bolted together. 



The foUowiug 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 cushious. 



D, fly-wheel. 



E, ma'u pulley. 



F, maiu cast-irou frame. 



G, timber supports. 

 H, pitman half-box. 

 I, cheeks. 



J, movable jaw. 

 K, jaw shaft. 



L, rubber spriug. 



L', spriug rods. 



M, pitmau-rod nuts. 



N N', uiaiu teusion-rod uuts. 



O, toggles. 



P, jaw (chilled plates). 



R, maiu teusiou rods. 



R' H, pitman. 



R', pitmau-rods. 



S, maiu eccentric shaft. 



T, toggle bearings. 



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

 iu Leadville. It is constructed on very uearly the same principles as the Blake 

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

 the same amount of jiower 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, iu oue respect, namely 

 the substitution of a crank shaft for the eccentric shaft. 



