US2274758A - Crushing mechanism - Google Patents

Description

March 3, 1942. G. B. WETTLAUFER ET AL I 2,274,758

CRUSHING MECHANISM Filed June '7, 1940 3 Sheets-Sheet 1 3 I rn/en l brs. earqe B. We/I/qufer'. C/m r/es F We fl/aufel'.

March 3, 1942. G. B. WETTLAUFER ET AL 2,274,758

' CRUSHING MECHANISM Filed June '7, 1940 5 Sheets-Sheet 2 I In ven Z0 ms. 41 SW 6 RWeff/wfn ,5 n Mar/es FWff/aufen March 3, 1942. G, B. WETTLAUFER ET AL 2,274,753

CRUSHING MECHANISM 3 SheetS-Sheet 3 Filed June '7, '1940 Patented Mar. 3, 19 42 wim- UNITED STATES PATENT OFFICE I 2,274,758 CRUSHING MEC ANISM George 13'. Wettl aufer and Charles W ettlaufer, Toronto, Ontario, Canada Application June 7; 1940', Serial No. 339,348 In Canada June 15, 1939 Claims.

The principal objects of this invention are to relieve stresses and strains on the shaft and bearings of a crusher mechanism due to the extreme weight of the crushing member displaceably carried thereby and to provide a more balanced torque condition.

A further object is to reduce friction and wear at the points of fulcrum support for the crusher member.

The principal features of the invention reside in the novel construction and arrangement of parts whereby the oscillating crusher member is provided with co-operating resilient means arranged to exert a resilient lifting force on the displaceable crusher member to relieve the operating shaft of the weight and strain of the crusher member while permitting free operating displacement thereof.

A further and important feature resides in the provision of a rolling fulcrum contact between the crusher member and crusher body to obviate destructive wear at this point.

In the drawings Figure 1 is a part sectional side elevational view of a jaw type crusher incorporating the present invention.

Figure 2 is a transverse section on the 2-2 of Figure 1.

Figure 3 is a plan view of the crusher shown in'Figures 1 and 2.

Figure 4 is a fragmentary sectional elevation illustrating a modified form of spring suspension.

Figure 5 is a plan view of a crusher showing a modified form of spring suspension.

Figure 6 is a side elevational view partly in section of the structure shown in Figure 5.

Figure 7 is a fragmentary transverse section taken on the line 1-1 of Figure 6.

Figures 8 and 9 are sectional plan and side elevational views illustrating a preferred form of roller support for the fulcrum.

In the operation of crushing mechanism, particularly of the oscillating jaw type, it is found that considerable wear and strain is placed on the supporting shaft and bearing due to the weight of the crusher member, which is considerable in the larger type crusher, and the present invention has been devised to overcome this difliculty in a simple but effective manner.

Referring to the form of invention shown in Figures 1, 2 and 3, the crusher body I carries the usual replaceable stationary jaw 2, and bearing supports 3 extend upwardly at the sides to support the main shaft 4, which shaft has eccentric line portions 5 encircled by the upper end of the oscillating pitman or crusher member 6.

As shown at I; roller bearings are preferably interposed between the eccentric portions 5 and the encircling portion of the members 6, and roller bearings 8 are preferably arranged within the supports 3 to support the shaft 4.

The upper end of the member 6 is shown provided with an undercut channel 9 into which blocks III are wedged and a series of supporting rods I I are flexibly secured inthe blocks IO and are provided with bolt extensions I2 pivotally connected therewith at I3 and these slidably extend through a horizontal frame member I4 secured to the end bearing supports 3.

Compression springs I5 encircle the bolts I2 and bear downwardly on the frame member I4, and adjustable nuts It on the rods I2 are adapted to variably tension the springs I5 so that collectively the springs will exert a resilient lifting force on the oscillatable member 6 which may be selected to substantially offset the Weight there'- of and thereby relieve the shaft and bearings of this weight.

In the modified form of spring suspension shown in- Figure 4 the suspension members II' and I2 are shown flexibly hooked together at I1,- and a slot I8 in the frame member I4 provides lateral freedom for the member I2 passing therethrough.

Referring to the modified form of spring suspension shown in Figures 5 to 7, a floating frame member I9 is loosely mounted on stud members 20 carried by the crusher frame I, and compression springs 2I resiliently suspend the floating frame member I9 and the tension of these may be varied by the clamping nuts 22.

The frame member I9 is provided with an arched undersurface substantially concentric with the shaft axis and formed with a series of serrations or locking notches 23, and these are adapted to be selectively engaged with serrations 24 formed in the meeting face of a block 25, which block is mounted on the upper end of the pitman 6' preferably in a flexible or relatively displaceable manner. a

The block 25 and central portion of the frame member I9 are provided with upwardly diverging slots 26 and 21 respectively which register to adjustably receive the clamping bolt 28, which is here shown having a swivelled bearing contact 29 at its lower end in the block 25.

In this type of jaw crusher it is customary illustrated particularly in Figure 2, comprises vertically and horizontally wedged blocks 30 and 3| respectively, the blocks 30 being adjusted by a threaded member 32.

It'is usual to employ a toggle plate 33 having fulcrum contact with the pitman 6 at one side and the block 3| at the other side, and to provide an adjustable tension means 34 for resiliently urging the lower end of the pitman away The edges of the toggle plate 33 are here shown of enlarged semi-circular form fitting within the recesses 31 and anti-friction roller rods 38 are interposed between the cylindrical surfaces of the toggle plate and blocks to provide an effective anti-friction contact over an extensive bearing area which will effectively distribute the enormous thrusts. V

Lubricant-retaining strips 39 seal the entrance to the bearing sockets and are retained by the packing plates 49. The toggle plate 33 may advantageously be provided with a lubricant duct 41 which leads through the cylindrical edge bearing portions from a common inlet 42.

The crusher body I is provided with inwardly extending lugs 43 which support a bridge plate 44, as shown in Figures 1 and 2, and coiled compression springs 45 are here shown bearing downwardly thereon and upwardly against a flange 46 projecting from the rear of the pitman 6 substantially in vertical alignment with the shaft 4, and these springs may be advantageously used in addition to the upper spring suspension, particularly in the heavier types of crushers as an auxiliary or alternative form of suspension.

While we have shown and described preferred embodiments of the present invention further structural modifications and adaptations may be resorted to within the essentialvspirit of the invention.

What we claim as our invention is:

1. In a crusher mechanism the combination with a crusher framehaving an eccentric shaft journaled therein and an oscillating crusher member eccentrically mounted on said shaft, of a floating frame member mounted thereabove and straddling said shaft, means interposed between said crusher frame and floating frame at either side of the shaft axis for resiliently suspending said floating frame member, and means forming an adjustable connection between said floating frame and said crusher member and arranged to transmit the thrust of said resilient suspension means to the crusher member to offset the weight thereof.

, 2. In a crusher mechanism, the combination with a shaft having eccentric portions and a crusher jaw operativelysuspended directly from said eccentric portions, of means for resiliently suspending said crusher member including rod members flexibly secured to said crusher member directly above the axis of said shaft and extending upwardly therefrom in radial relation to the shaft axis, and means forming a resilient suspension for said rod members including a rigid frame element surmounting said shaft in straddled relation and engaging said resilient suspension means.

3. Means as claimed in claim 1 in which said rod members are of double articulated form to provide for the swinging displacement of the crusher member in close coupled relation to the resilient suspension means.

4. Means as claimed in claim 1 in which said rod members are anchored at their lower extremities in block members of upwardly converging form, the upper end of the crusher member being formed with upwardly converging channels opening upwardly and having said blocks, inserted therein.

5. In a crushing mechanism, the combination with the main crusher frame having bearing bosses, and a shaft, rotatable therein having an eccentric portion and a crusher jaw operatively suspended directly from said eccentric portion, of a frame member secured to said bearing bosses and longitudinally bridging the upper end of the crusher member directly over the shaft axis, rod members flexibly connected to the upper end of the crusher member in such manner asto exert an upward force thereon when urged vertically and extending slidably upwardlythrough said bridging frame member in radial relation to the said shaft, compression springs encircling the rod members above said frame member 'and bearing downwardly on said frame, and clamping nuts threaded on the upper endof said rods and bearing downwardly on .said compression springs to control the compression thereof, said springs acting through said clamping nuts, to urge said rods1upwardly whereby the said shaft will be relieved of the full weight of said crusher member. I I

GEORGE B. WETTLAUFER. CHARLES F. WE'ITL-AUFER.

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