US3583648A

US3583648A - Jaw crusher

Info

Publication number: US3583648A
Application number: US798932A
Authority: US
Inventors: Edward H Baxa
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1969-02-13
Filing date: 1969-02-13
Publication date: 1971-06-08
Anticipated expiration: 1988-06-08

Abstract

A jaw crusher comprising a framework in which are mounted a stationary jaw and a movable jaw defining therebetween a crushing chamber. A drive shaft is supported by the framework and carries eccentric means journaled for rotation in a pitman which is connected to grasp a flexible cable or the like intermediate the connection of the cable to the movable jaw and the connection of the cable to the framework, whereby movement of the pitman by the eccentric means imparts movement to the movable jaw with a double-toggle motion.

Description

United States Patent inventor Edward H. Baxa Genesee Depot, Wis. Appl. No. 798,932 Filed Feb. 13, 1969 Patented June 8, 1971 Assignee Allis-Chalmers Manufacturing Company Milwaukee, Wis.

JAW CRUSHER 12 Claims, 8 Drawing Figs.

11.8. CI 241/268 Int. Cl B02c 1/04 Field of Search 241/264- [56] References Cited UNITED STATES PATENTS 2,575,301 11/1951 Shafter 241/264X Primary ExaminerDonald D. Kelly At!0rneys- Robert C. Sullivan, Arthur M. Streich and Robert B. Benson ABSTRACT: A jaw crusher comprising a framework in which are mounted a stationary jaw and a movable jaw defining therebetween a crushing chamber. A drive shaft is supported by the framework and carries eccentric means journaled for v rotation in a pitman which is connected to grasp a flexible cable or the like intermediate the connection of the cable to the movable jaw and the connection of the cable to the framework, whereby movement of the pitman by the eccentric means imparts movement to the movable jaw with a doubletoggle motion.

J AW CRUSHER BACKGROUND OF THE INVENTION l. Field of the Invention This invention relates to jaw crushers, and in particular to a jaw crusher in which movement of the pitman which drives the movable swing jaw of the crusher is transmitted to the movable swing jaw by a flexible cable or rod.

2. Description of the Prior Art It is known in the prior art to drive the pivotally mounted swing jaw of a crusher by means of a pitman mounted on a rotating eccentric and transmitting motion from the pitman to the swing jaw by a toggle linkage. Such a construction is shown for example by US. Pat. No. 2,767,597, entitled Safety Toggle issued to John Narsted, on Oct. 23, 1956. One problem associated with the use of a toggle linkage to transmit motion from the pitman to the swing jaw, as shown by the Narsted patent, for example, is the fact that the connection points of the toggle linkage to the pitman and to the swinging jaw are bearing surfaces which must be constantly lubricated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new and improved jaw crusher in which motion is transmitted to the swing jaw of the crusher from the eccentrically driven pitman by means of a flexible cable or the like operating within its elastic limits.

Another object of the invention is to provide a jaw crusher of the type in which motion is transmitted to the moving or swing jaw of the crusher through a connecting member which does not require lubrication.

Still another object of the invention is to provide a jaw crusher in which a double-toggle-type motion is provided for the movable jaw, using a construction requiring fewer parts than and of greater simplicity than in prior art constructions having such motion.

It is still another object of the invention to provide a jaw type crusher in which the framework of the crusher is stressed in compression by the linkages associated with the transmission of motion to the swing jaw, thereby permitting the frame to be of much lighter weight than in prior art constructions.

In achievement of these objectives, there is provided in accordance with an embodiment of this invention a jaw crusher comprising a framework in which are mounted a stationary jaw and a movable jaw defining therebetween a crushing chamber. A drive shaft is supported by the framework and carries eccentric means journaled for rotation in a pitman which is connected to grasp a flexible cable or the like intermediate the connection of the cable to the movable jaw and the connection of the cable to the framework, whereby movement of the pitman by the eccentric means imparts movement to the movable jaw with a double-toggle-type motion.

Further objects and advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawing in which:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view in side elevation of a jaw crusher in accordance with the invention;

FIG. 2 is a view in cross section taken on line lI-ll of FIG. 1, of the crusher showing the mounting of the pitmans on the eccentric drive means;

FIG. 3 is a plan view ofthe crusher of FIGS. 1 and 2;

FIG. 4 is a fragmentary plan view of a modified crusher construction in accordance with the invention;

FIG. 5 is a view along section line VV of FIG. 4; FIG. 6 is a view in section along section line VI-VI of FIG.

FIG. 7 is a view taken along line VII-VII of FIG. 3; and FIG. 8 is a view taken along line VIII-VIII of FIG. 6.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIGS. 1, 2, 3, 6, 7, and 8 of the drawings, there is shown a crusher generally indicated at 10 comprising a pair of spaced apart

sidewalls

12, 13 and a pair of

end walls

14, 15. A drive shaft 16 is rotatably driven by means not shown and is supported for rotation by bearings carried by the

opposite walls

12, 13 of the crusher, the shaft 16 including eccentric portions 18 which are positioned exteriorly of the

walls

12 and 13. The eccentric portion 18 at each end of shaft 16 is journaled in one of the respective pitmans 20, 20' located exteriorly of the

respective sides

12, 13 of the crusher. A fixed or stationary jaw 22 is mounted between the transverse walls l2, 13 of the crusher. Stationary jaw 22 may be held in place by hydraulic means 23 or by other suitable means which will yield under a predetermined force to permit movement of the stationary jaw for tramp iron relief of the crusher. Movable or swing jaw 24 is also mounted between the

transverse walls

12, 13 of the crusher, jaw 24 being supported at the upper end thereof for pivotal movement about an axis 26.

As best seen in FIGS. 1 and 7, one end of a steel cable 25 is anchored to the stationary framework, such as to the end wall 15.

It will be noted that the end of the cable is clamped by a suitable clamping means 17 to the outside surface of end wall 15, the cable passing through a passage 19 in the end wall in overlying relation to a stationary rounded and grooved surface 21. The rounded grooved surface 21 may be formed in end wall 15 or in a separate piece inserted in and forming a part of end wall 15. The cable 25 passes lengthwise of the crusher along the outside of one sidewall 12 where it is connected in clamped engagement with the lower end of the pitman 20 on one side of the crusher, the cable then passing around a pulley or sheave 27 carried by the lower end of the swing jaw 24 adjacent sidewall 12. The cable then passes in back of swing jaw 24 and around another sheave 27 carried by the opposite end of the movable or swing jaw 24 near the sidewall 13. Sheaves 27 and 27' extend through passages such as 38 in sidewalls l2 and 13, passages 38 being large enough to accommodate any movement of

sheaves

27 and 27 and their supports caused by pivotal movement of jaw 24. The cable then passes lengthwise of the wall 13 exteriorly thereof, and is held in clamped engagement with the pitman 20 adjacent wall 13. The terminating end of the cable is anchored at 29 to end wall 15 in laterally spaced relation to the anchor point of the beginning end of the cable, being anchored in a manner similar to that shown at 17, 19, and 21.

As best seen in FIGS. 1, 6, and 8 the clamp construction by means of which the cable 25 is secured to and grasped by the lower end of the

pitman

20 or 20 includes a flat upper clamping plate member 31 rigidly secured as by welding to the lower end of the pitman 20, and a cooperating lower clamping plate member 33. Upper plate member 31 is provided with a groove 35 on the under surface thereof. The lower clamping plate 33 is of arcuate contour and is provided with an upwardly facing groove 36 which cooperates with groove 35 in clamping plate 31 to receive cable 25. The upper and

lower plates

31 and 33 are secured in clamped relation to cable 25 by means of suitable fastening means indicated at 37. When pitman 20 is in its lowermost position, cable 25 contacts or lays in groove 35 of upper clamping plate 31 and only in the center portion of groove 36 of lower clamping plate 33, whereas when the pitman rises during its eccentric motion, the cable 25 drops down from the end portions of groove 35 and lays into the groove 36 of the lower clamping plate 33.

A clamping means similar to that shown in FIG. 6 is provided for clamping cable 25 to each respective pitman 20, 20'.

A rod 28 is attached to the lower end of the rear wall of swing jaw 24 adjacent the lower end thereof, rod 28 passing through an aperture in the adjacent end wall 14 of the crusher frame and being mounted for sliding movement therein. A spring member 30 is received on the end of the portion of rod 28 which projects exteriorly of wall 14. A spring seat 32 is provided at the outer end of the rod 28. The spring 30 is interposed between the outer surface of end wall 14 and the spring seat 32 in such manner as to constantly bias rod 28 in an outward direction, whereby rod 28 and the associated spring 30 tend to return the jaw 24 in the direction of end wall 14, or to the left with respect to the view of FIG. 1.

As the pitmans and 20 move due to the rotation of the

eccentrics

18, and 18, a movement is imparted to the cable which urges swing jaw 24 in the direction of the stationary jaw 22. The flexing of the cable 25 is within the elastic limits of the material of which it is made, such as steel. The return movement of the swing jaw 24 in the opposite direction, away from the stationary jaw 22, is provided by the spring and rod 28 connected to the lower end of swing jaw 24.

The use of the

sheaves

27, 27 to guide the cable 25 as it passes about the swing jaw 24 permits movement of the cable on opposite sides of the crusher to equalize.

A flywheel 34 is mounted on shaft 16 outboard of the eccentric 18. If desired, a pair of flywheels may be provided, one on each end of the shaft 16 outboard of the eccentrics 18, 18'.

Referring now to FIG. 4 there is shown a modified embodiment in which separate cables are utilized on opposite sides of the crusher rather than having a single continuous cable as in the embodiment ofFIGS. 1,2,3, 6, 7, and 8. Referring now to FIG. 4, there is shown a crusher generally indicated at 110 comprising a pair of spaced-apart sidewalls 112, only one of which is shown in the fragmentary view of FIG. 4, and a pair of

end walls

114 and 115. A drive shaft 116 is rotatably driven by means not shown. Shaft 116 is supported for rotation by bearings carried by the opposite walls 112 of the crusher, the shaft including eccentric portions 118 similar to the eccentric portions 18 of the embodiment of FIGS. l3, which are positioned exteriorly of the walls 112. The eccentric portions 118 at each end of shaft 116 are each respectively journaled in a separate pitman such as

pitmans

20, 20 of the embodiment of FIGS. 1--3, located exteriorly of the respective sides 112 of the crusher. A flywheel 134 is connected to the outer end of shaft 116. A fixed or stationary jaw 122 is mounted between the opposite sidewalls 112 of the crusher. Stationary jaw 122 may be held in place by hydraulic means 123 or by other suitable means which will yield under a predetermined force to permit movement of the stationary jaw 122 for tramp iron relief of the crusher. Movable or swing jaw 124 is also mounted between the transverse walls 1 12, jaw 124 being supported at the upper end thereof for pivotal movement about an axis similar to the axis 26 of the embodiment of FIGS. 13. One end of a steel cable 125 is anchored to the stationary framework such as end wall 115 in the same manner as the cable 25 of the embodiment of FIGS. 1-3 is anchored to the end wall 15, as best seen in the detail view of FIG. 7 of the drawings. Also, the lower end of each pitman rod is secured in clamped engagement to the intermediate portion of the cable length in grasping relation thereto in the same manner as shown in the embodiment of FIGS. 13 and in the detailed views of FIGS. 6 and 8, and will not be described again. The forward or left-hand end of each cable 125 with respect to the view in FIG. 4, is anchored to a corresponding laterally projecting portion 126 of the movable jaw 124. Each laterally projecting portion 126 extends through a suitable passage 138 in one of the respective sidewalls I12, and each cable 125 extends around a grooved arcuate surface of the corresponding projecting portion 126 and is rigidly secured to the projecting portion 126 by suitable fastening means 128. It will be understood that on each of the opposite sides of the crusher 110 a similar cable 125 extends along the corresponding sidewall 112 of the crusher and is connected in the manner just described to the end wall 115, to the corresponding pitman and to a projection 126 passing through a passage 138 in the corresponding sidewall I12. I Passages 138 are large enough to accommodate anymovement of projections I26 caused by pivotal movement of jaw 124,

A spring means (not shown) such as the spring 28 of the embodiment of FIGS. 1, 2, 3, 6, 7, and 8 is provided to bias movable jaw 124 away from the normally stationary jaw 122.

The use of the cable or cables as described in the several embodiments transmits motion produced by the eccentrics from the pitmans to the

swing jaw

24 or 124 with a double-toggle effect upon the upward movement of the pitman away from the cable, at the same time eliminating wear and necessity for lubrication associated with toggle joints or toggle connections of the prior art between the pitmans and they swing jaw. Furthermore, the use of the cable as described places the entire crusher frame in compression, with the result-that the frame which is ordinarily made of steel or case iron or the like having much greater strength in compression than in tension can be made of much lighter weight construction than crusher frame constructions of the prior art. The cable or cables should be taut, of course, so that the movement of the pitman will properly effect closing movement of the

movable jaw

24 or 124. A pair of metal rods, such as alloy steel rods flexing within the elastic limits of the material of which they are made, could be substituted in place of the cables 125, in the embodiment of FIGS. 4 and 5.

It is preferred in the embodiment of FIGS. l-3, 6, 7, and 8 to utilize a single cable from the clamping point 17 to the clamping point 29, with the same cable passing from clamping point 17 along side 12 of the frame, crossing over on

sheaves

27 and 27, passing along side 13 of the frame, and terminating at clamping point 29.

However, it would also be within the contemplation of this invention, although less desirable, to have a separate length of cable run from clamping point 17 on the frame to the cable clamp on pitman 20, to have another piece of cable run from the clamp on pitman 20 along side 12 of the frame, around sheave 27, thence to sheave 27, thence along side 13 of the frame to the cable clamp on pitman 20, with still another length of cable running from the cable clamp on pitman 20' to the clamping point 29 on the frame. Likewise, in the embodiment of FIGS. 4 and 5 it is within the contemplation of the invention, although less desirable, on each respective side of the frame to have a separate length of cable run from the clamping point on the stationary framework to the clamp on the pitman, and on each respective side to have another length of cable run from the clamp on the pitman to the clamping point on the movable jaw.

From the foregoing detailed description of the present invention, it has been shown how the objects of the invention have been attained in a preferred manner. However, modifications and equivalents of the disclosed concepts such as readily occur to those skilled in the art are intended to be included within the scope of this invention.

The embodiments of the invention in which I claim an exclusive property or privilege are defined as follows:

1. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, eccentric means carried by and rotatable with said drive shaft, a pitman mounted on said eccentric means, flexible motion-transmitting means connected between said movable jaw and said framework, said pitman being connected to grasp said motiontransmitting means intermediate said movable jaw and said framework, whereby to pull on said motion-transmitting means upon movement of said pitman by said eccentric means to thereby impart movement to said movable jaw.

2. A crusher as defined in claim 1 in which said pitman pulls on said motion-transmitting means upon movement of said pitman by said eccentric means upwardly away from said motion-transmitting means.

3. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft,

means for rotatably driving said drive shaft, eccentric means carried by and rotatable with said drive shaft, a pitman mounted on said eccentric means, a flexible cable connected between said movable jaw and said framework, said pitman being connected to grasp said flexible cable intermediate said movable jaw and said framework, whereby to pull on said flexible cable upon movement of said pitman by said eccentric means.

4. A crusher comprising a framework, a pair of jaws defining a crushing chamber with said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, eccentric means carried by and rotatable with said drive shaft, a pitman mounted on said eccentric means, a flexible rod connected between said movable jaw and said framework, said pitman being connected to grasp said flexible rod intermediate said movable jaw and said framework, whereby to pull on said flexible rod upon movement of said pitman by said eccentric means.

5. A crusher as defined in claim 1 including means biasing said other jaw away from said one jaw.

6. A crusher as defined in claim 1 including spring means biasing said other jaw away from one jaw.

7. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, a first and a second eccentric means carried by and rotatable with said drive shaft in spaced relation to each other contiguous opposite sides of said framework, a first and a second pitman respectively mounted on said first and second eccentric means, flexible motion-transmitting means connected between said movable jaw and said framework on said opposite sides of said framework, said first and said second pitman being respectively connected to grasp said motion-transmitting means intermediate said movable jaw and said framework on said opposite sides of said framework, whereby to pull on said motion-transmitting means upon movement of said first and said second pitman by said first and said second eccentric means, to thereby impart movement to said movable aw.

8. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, a drive and a second eccentric means carried by and rotatable with said drive shaft in spaced relation to each other contiguous opposite sides of said framework, a first and a second pitman respectively mounted on said first and said second eccentric means, a single continuous flexible cable connected between said movable jaw and said framework on said opposite sides of said framework, said cable extending along the respective opposite sides of said framework, said first and said second pitman being respectively connected to grasp said cable intermediate said movable jaw and said framework contiguous corresponding respective opposite sides of said framework, whereby to pull on said cable upon movement of said first and said second pitman by said first and second eccentric means.

9. A crusher comprising a framework, a pair ofjaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, a first and a second eccentric means carried by and rotatable with said drive shaft in spaced relation to each other contiguous opposite sides of said framework, a first and a second pitman respectively mounted on said first and said second eccentric means, a first flexible cable connecting said movable jaw to said framework contiguous one side of said framework, and a second flexible cable connecting said movable jaw to said framework contiguous the opposite side of said framework,

said first and said second pitman being respectively connected to grasp said first and said second cable intermediate said movable jaw and said framework, whereby to pull on said respective first and second cable upon movement of said first and said second pitman by said first and said second eccentric means.

10. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, a first and a second eccentric means carried by and rotatable with said drive shaft in spaced relation to each other contiguous opposite sides of said framework, a first and a second pitman respectively mounted on said first and said second eccentric means, a first flexible rod connecting said movable jaw to said framework contiguous one side of said framework, and a second flexible rod connecting said movable jaw to said framework contiguous the opposite side of said framework, said first and said second pitman being respectively connected to grasp said first and said second rod intermediate said movable jaw and said framework, whereby to pull on said respective first and said second rod upon movement of said first and said second pitman by said first and said second eccentric means.

11. A crusher as defined in claim 1 in which said motiontransmitting means is a cable.

12. A crusher as defined in claim 1 in which said motiontransmitting means is a rod.

3-1050 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 1 58 648 Dated June 8 l 1971 Inventor(s) Edward H. Baxa It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Eolumn 5, claim 4, line 2, cancel "with" and substitute within Column 5, claim 8, line S, cancel "drive" (second occurrence) and substitute first Signed and sealed this 1L ,th lay of December 1971 (SEAL) Attest EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attestinsz Officer Acting Commissionerof Patents

Claims

1. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, eccentric means carried by and rotatable with said drive shaft, a pitman mounted on said eccentric means, flexible motion-transmitting means connected between said movable jaw and said framework, said pitman being connected to grasp said motion-transmitting means intermediate said movable jaw and said framework, whereby to pull on said motion-transmitting means upon movement of said pitman by said eccentric means to thereby impart movement to said movable jaw.

3. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, eccentric means carried by and rotatable with said drive shaft, a pitman mounted on said eccentric means, a flexible cable connected between said movable jaw and said framework, said pitman being connected to grasp said flexible cable intermediate said movable jaw and said framework, whereby to pull on said flexible cable upon movement of said pitman by said eccentric means.

7. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, a first and a second eccentric means carried by and rotatable with said drive shaft in spaced relation to each other contiguous opposite sides of said framework, a first and a second pitman respectively mounted on said first and second eccentric means, flexible motion-transmitting means connected between said movable jaw and said framework on said opposite sides of said framework, said first and said second pitman being respectively connected to grasp said motion-transmitting means intermediate said movable jaw and said framework on said opposite sides of said framework, whereby to pull on said motion-transmitting means upon movement of said first and said second pitman by said first and said second eccentric means, to thereby impart movement to said movable jaw.

9. A crusher comprising a framework, a pair of jaws defining a crushing chamber within said framework, one of said jaws being normally stationary, the other of said jaws being mounted for movement relative to said one jaw, a drive shaft, means for rotatably driving said drive shaft, a first and a second eccentric means carried by and rotatable with said drive shaft in spaced relation to each other contiguous opposite sides of said framework, a first and a second pitman respectively mounted on said first and said second eccentric means, a first flexible cable connecting said movable jaw to said framework contiguous one side of said framework, and a second flexible cable connecting said movable jaw to said framework contiguous the opposite side of said framework, said first and said second pitman being respectively connected to grasp said first and said second cable intermediate said movable jaw and said framework, whereby to pull on said respective first and second cable upon movement of said first and said second pitman by said first and said second eccentric means.

11. A crusher as defined in claim 1 in which said motion-transmitting means is a cable.

12. A crusher as defined in claim 1 in which said motion-transmitting means is a rod.