US2065612A - Rock crusher - Google Patents

Description

Dec. 29, 1936. J. RAsMussEN ROCK GRUSHER Filed Feb. 1, `1935 3 Sheets-Sheet l ,1| l l l M .E lm y M M Dec. 29, 1936. J. RAsMUssl-:N y 2,065,612

ROCK CRUSHER Filed Feb. l, 1935 v 3 Sheets-Sheet 2 INVENTOR. Jai/y @SWZ/6.5i#

Dec. 29, 1936. y J, RASMUSSEN 2,065,612

ROCK CRUSHER Filed Feb. l, 1935 3 Sheets-Sheet 3 3. INVENTOR.

ATTORNEY.

Patented Dec. 29, 1936 UNITED STATES lPATENT OFFICE 2 Claims.

This invention relates to a rock Crusher. The usual rock crusher operates from a heavy pitman suspended from an eccentric drive shaft which requires the operating motor to constantly lift the Weight of the pitman and its associated toggle system. Also in the usual crusher, the line of force to the crushing body is below and out of alignment with the drive shaft. This indirect application of the crushing force results in destructive bending stresses in the frame and operating mechanism and causes frictional strains which result in great loss o-f power.

The principal object of the present invention is to provide a rock crusher construction in which the line of force from the power shaft to the point of maximum crushing will be in a straight line; in which the power will not be required to lift akheavy pitman or toggle system; in which the power will be applied to the crushing jaws opposite the location of the largest rocks; and in which the moveable jaw will move inwardly to crush the rock and downwardly to grind and move the rock toward the discharge.

Another object of the invention is to provide crushing faces which will grip smooth rocks of the niggerhead type and yet which will allow a rapid discharge of the crushed material.

A further object of the invention is to so construct the crusher that should tramp steel or other uncrushable material accidentally enter between the jaws, easily replaceable bolts will be sheared without damage to the crusher mechanism.

A still further object is to provide a crusher in which the various parts will be interchangeable when worn so as to equalize the wear thereon and increase the life thereof.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efciency. These will become more apparent from the following description.

In the following detailed description of the invention reference is had to the accompanying drawings which form a part hereof. Like numerals refer to like parts in all views of the drawings and throughout the description.

In the drawings:-

Fig. 1 is a plan view of the preferred form of the improved crusher.

Fig. 2 is a longitudinal section therethrough, taken on the line 2 2, Fig. 1.

Fig. 3 is a plan View of the toggle plate.

Fig. 4 is a side view thereof.

Fig. 5 is a plan view of the eccentric member.

Fig. 6 is a side view of the eccentric member.

Fig. 7 is a side view of the crusher of Fig. 1.

Fig. 8 is an enlarged section through the thrust bearing and block.

Fig. 9 is a plan View, partially in section, of the 5 thrust block.

Fig. 10 is a detail perspective view of a shim plate employed in the crusher.

Fig. ll is a longitudinal section through an alternate form of the invention. 10

The invention comprises: a supporting and enyclosing frame I0 preferably consisting of two side plates integrally joined by a head strut II and an inclined fixed jaw support I2. The upper edge of the frame I0 supports two angle bearings 15 I3 in which a power shaft I4 is carried. The shaft I4 is provided with the usual y wheels I5 and drive pulley I6 and intermediate the bearings I3, with an eccentric I'I.

A jaw shaft I8 and a pitman shaft I9 also ex- 20 tend between the side plates of the frame IIl. The extremities of the jaw shaft I8 are carried in sliding boxes 63 which may be moved horizontally in box. frames formed on the side plates ofthe frame I0, by means of suitable set screws 2|. The pitman shaft I9 is permanently journalled in the side plates of the frame I 0.

'Ihe jaw shaft I8 carries a movable jaw member 22 which is fixed thereon by means of a set screw 23. A movable jaw plate 24 is clamped to 30 the forward face of the jaw member 22 b-y means of suitable clamp bolts 25. The upper and lower edges of the jaw plate 24 are bevelled and the lower edge rests on a similarly bevelled shoulder 26. The clamp bolts 25 have bevelled gibs 61 35 under their heads for clamping the upper edge. This construction allows the jaw plate 24 to be removed and inverted when it becomes worn along its lower face.

A removable stationary jaw plate 2l is carried .-40 on the inner face of the frame jaw support I2. On the back of the plate 21 is a laterally extending rib 28 which fits into a laterally extending groove in the jaw member I2 to prevent the plate from shifting thereon. '45

The crushing space between the plates 24 and 2l is closed at the sides by means of removable cheek plates 29 which are similar to each other and reversible as to position. Each plate carries 50 a V-shaped clamping flange 30 providedwith a slotted opening 3| through which a clamp screw 32 passes to hold the check plate down in place.

' When the plates are reversed as tol position, the ,bolt 32 will occupy the other extremity of the 55 iit f'bousn.

slotted opening 3I and the other leg of the V shaped flange 30.

The motion of the eccentric I1 is transmitted to the movable jaw member 22 by means of three members: an eccentric member 33, a pitman 35, and a toggle plate 31. The eccentric member 33 surrounds the eccentric I1 and extends forwardly therefrom, terminating in a removable thrust plate 34. The thrust plate contacts the upper extremity of the pitman 35- which extends upwardly from the pitman shaft I9, upon which it is secured by means of a suitable set screw 36.

The motion of the pitman 35 is transmitted to.

the mOVable jaw member 22 by means of the toggle plate 31. Y

It can be readily seen that the above'construction transmits the eccentric motion of the eccentric l1 to the pitman 35 so'as to impart a rocking motion to the latter. This motion is then. transmitted to the movable jaw member 22 to cause ,itsv crushing plate2lI` to approach and withdraw from the plate 21.

It is desired to call attention to the fact that the forward face of the jaw member 22 is offset In front of the axis of the shaft I8. Owing to the forward position of the plate 24 with reference to the shaft I8, this .plate will swing both inwardly and Ydownwardly as indicated by the arrows in Fig. -2. The forward face of the plate 24 is grooved laterally, as indicated by the corrugations38. The forward face of the plate 21V is grooved vertically, asl indicated bythe corrugationsY 39. The lateral corrugations allow the movable plate to grip smooth rock surfaces so as to hold the latter between the jaws. The vertical corrugations allow the crushed rock to readily flow downwardly.V It is preferred to terminate the corrugations above the discharge space between the bottoms of the jaws so as to prevent passage of oversize material.

Ther entire toggle system'is held Ytogether by means of a compression spring 40 acting under an adjusting nut 4I on va.v `spring vrod42. The forward extremity of the spring rod engages an ear 43 on the movable jaw member 22 and extends through an ear 44 on the eccentric member 33. No power is absorbedy in compressing the spring 40 since it moves with the movement of the jaws.

The toggle plate 31 and the thrust plate 34 are formed at their pressure points with rounded cylindrical bearing edges, as indicated at 45, Fig. 8.v To receive the thrust of these heads and to provide a renewable wearing surface therefor, a thrust block 46, as shown in Fig. 9, is inserted in both faces of the pitman 35 and the rear face of the movable jaw member 22. The thrust blocks 46 are dovetailed in shape and slide into place in horizontal dove-tailed grooves ln'their respective members. The block 46 in the movable jaw member 22 is provided with a central lug 41 which engages a recess 48 in the toggle plate to prevent Vside movement of the latter. The thrust plate 34 is attached to the eccentric member 33 by means of suitable attachment bolts 49 rso that the contacting edge can be replaced with- Voutrequiring replacement of .the entiregeccentric` member 33. j

Itis desired to call attention to the fact that Vthe thrust plate 34 rests against the shoulder'50 on the eccentric member 33 so as to transmit its push in a straightline to the axis ofthe eccentric I1 without exerting al shearing action on` the End plates and jaw plates Crushers are often :ing portions Vof the machine.

illustrated, particularly designed Should incompressible material enter between the jaws, the two parts of the toggle member will slide upon each other so as to shear the bolts 53 and completely relieve the strain on the remain- In crushing easily crushed materiaLonly a few of the bolts 53 need be inserted so that Vthey will easily shear, should more difcultly crushable material enter between the jaws.

The pressure zones of the bearing edges 45 are lubricated from lubrication grooves 54 formed along the top of each thrust block. Oil holes lead from the grooves 54 to the upper sides of the bearing edges. The lubrication then works downwardly to the friction zones. Oil or grease is fed to the grooves 54 from suitable lubricators 55.

The neness of the crushing is of course determined by the space between the bottom edges of the two plates 24 and 21. This space can` be regulated'by means of the set screws 2|. It has been found, however,'that in actual use., the vlbration and pressure upon these set screws is sufficient Ato upset and distort them. This upsetting action may be relieved by means of shim plates 56 Vas shown in Fig. 11. These plates are furnished in various'thicknesses and, after the set screws have been adjusted may be inserted in the box frames 20 toreceive the pressure of the sliding boxes 63. provided with a notch 64 for allowing it to pass the set screw 2 I.

In Fig. 9, an alternate form of the invention is for small laboratory machines and the like. In this form the invention is similar to the preceding form with the exception of two features. In this form,

vthe. pitman 35 and the toggle plate 31 have been eliminated, and a single eccentric member 58 has been used in their placev which carries formed thereon a 'relatively long thrustarm 59 Ywhich pushes directly against the rear of a. movable On this 'form 'it is necessary for the power to 1 compress the spring 68 during' thecrushing operation, but owing to the fact'that this'construction is employed only on the very small machine Yonly a light spring is necessary.

Each of the platesV 56 is While afspecic form of the improvement has `IRS Lbeen described andillustrated herein, it is desired to be understoodthat the same may be varied,

ywithin thescope of the appended claims, without 'departing from the' spirit ofthe invention.

Having thus described the invention, what is "claimed and desired secured by Letters Patent l. A rockcrusherf comprising a' frame, a. fixed jaw support carried by said frame, a drive shaft supported byl's'aidframe; V'am'o'vable jaw member l'IIS supported by said frame in coacting relation to said fixed jaw support, an eccentric on said drive shaft, an eccentric member riding on said eccentric, a pitman hinged at its lower extremity in and to said frame below said eccentric and eX- tending upwardly for receiving the thrust from the eccentric member, a toggle. plate extending from the upper extremity of said pitman to said movable jaw member, said pitman having a portion engaged between said eccentric member and said toggle plate, and spring controlled means carried by the movable jaw member and the eccentric member for holding abutting portions of the movable jaw member, toggle member, pitman, and eccentric member in contact with each other.

2. A rock crusher comprising a frame, a fixed jaw support carried by said frame, a drive shaft supported by said frame, a movable jaw member supported by said frame in coacting relation to the xed jaw support, an eccentric on said drive shaft, an eccentric member riding on said eccentric, a pitman hinged at its lower end in and to said frame below said eccentric and extending upwardly for receiving the thrust from the eccentric member, a toggle member extending between the upper end portion of said pitman and a confronting upper portion of said movable jaw member, ears extending upwardly from the eccentric member and the movable jaw member, a rod extending between the eccentric member and the movable jaw member over said pitman and loosely engaged through said ears, said rod having a head atone end engaging the ear of the movable jaw member and its other end portion projecting from the ear of the eccentric member, a spring about the projecting end portion of said rod having one end bearing against the ear o-f the eccentric member, and an abutment for the other end of the spring adjustably carried by said rod, said rod and spring constituting spring controlled means for holding abutting portions of the movable jaw member, toggle member, pitman and eccentric member in contact with each other.

JOHN RASMUSSEN.

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