US1550669A

US1550669A - Core breaker for mining machines

Info

Publication number: US1550669A
Application number: US530918A
Authority: US
Inventors: Newton K Bowman
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-01-21
Filing date: 1922-01-21
Publication date: 1925-08-25
Anticipated expiration: 1942-08-25
Also published as: GB248997A; DE492674C; FR601146A

Description

Aug. 25,1925. 1 1,550,669 N. K. BOWMAN CORE BREAKER FOR MININGMACHINES Filed Jan. 21, 1922 2 Sheets-Sheet 1 1 9 WW H 1 HHW v 1 Ziwvgnjob jif- KBow/izan Nag-M ('lttome N. K. BOWMAN CORE BREAKER FOR MINING MACHZNES Filed Jan. 2 l, 1922 2 Sheets-Sheet 2 .L MU WWW -llllllnji m] y; I

Patented Aug. 25, 1925.

UNITED STATES NEWTON K. BOWMAN, OF BOWDIL, OI-IIO.

ATENT OFFICE.

CORE BREAKER FOB MINING MACHINES.

: Application filed January 21, 1922. Serial No. 530,918.

To all whom it may concern:

Be it known that I, NEWTON K. BOWMAN, a citizen of the United States, residing at Bowdil, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Core Breakers for Mining Machines, of which the following is a specification.

This invention relates to means for and method of removing cores from coal in mines and one object of the invention is to provide an improved core breaker especially designed for use in connection with mining machines. The invention seeks to provide a device which may be interposed in a mining machine chain for chipping or breaking away a sulphur core in a coal vein as the cutting operation progresses.

A further object of the invention is to provide a method and means whereby to chip away the core, and thus serve to pro tect the cutting teeth of the chain against injury by coming in contact with a projecting core ledge and being deflected and dulled thereby.

And the invention has a still further object to provide a device so constructed that by the use of a pair of the devices in a mining machine chain, the full height of the cut of the chain will be covered so that regardless of the position of a core exposed in the cutting operation, either one or the other or both of said devices will act upon the core for chipping the proj ecting ledge of the core away.

Other and incidental objects will appear hereinafter.

In the drawings:

Figure 1 is a diagrammatic view showing a pair of my improved core breakers interposed in a mining machine chain.

Figure 2 is a plan view of the device.

Figure 3 is a vertical sectional view on the line 33 of Figure 2, looking in the direction of the arrows.

Figure 4 is a detail plan view of one of the chipping burs employed.

Figure 5 is an enlarged sectional View showing the device in use.

Figure 6 is an enlarged sectional View on the line 6-6 of Figure 1, looking in the direction of the arrows, and

Figure 7 is an enlarged sectional view on the line 7-7 of Figure 1, looking in the direction of the arrows.

In the mining of coal, a sulphur core is often encountered in the vein. This core is very hard, in fact, so hard that the cutting teeth of an ordinary mining machine chain cannot cut through the core. The result is that the teeth are deflected by the core above and below the core so that, as the cutting operation progresses and the vein is cut away above and below core, the core forms a projecting ledge in the cut. This ledge not only interferes with the mining machine chain but also, due to its hardness, soon dulls the teeth of the chain. The present invention, therefore, seeks to provide a device which may be interposed in a mining machine chain for breaking down the projecting ledge of the core coincident with the cutting operation. Further, since it has been proven impracticable to attempt to cut the core, due to its hardness, the present invention also seeks to provide a device which, instead of cutting the core, will operate thereon with a chipping or cracking action for breaking down the core coincident with the cutting operation.

In carrying the invention into effect, I employ a link comprising a body 10 which is provided with eyes 11 so that the link may be interposed in a mining machine chain in the usual manner. Formed in the link body to open through the outer end thereof, is a plurality of recesses 12 and mounted in said recesses are bushings 13. Journaled in said bushings are core breakers preferably in the form of chipping burs 14. These chipping burs are provided with cylindrical shanks 15 rotatably fitting in the bushings and formed in said shanks are channels or grooves 16 elongated longitudinally of the shanks. Three of the burs are preferably employed upon the link and, as will be observed upon reference to Figure 3, the burs are staggered or all project at different angles from the body, no two of the burs being alined. Formed in the link body at opposite sides thereof to accommodate the intermediate bur and the bur at one end of the link body, are bosses 17 and threaded through the link body to engage at their inner ends in the channels 16 of the shanks 15 of the burs are retaining bolts 18 rotatably connecting the burs with the link. These retaining bolts are preferably secured by locking nuts 19 and bearing bet-ween the bottom walls of the recesses 12 and the inner ends of the shanks 15 of the burs are springs 20 yieldably supporting the burs for inward movement upon the link body. As shown in detail in Figure 4, the burs are preferably frusto-conical in shape and are each formed with a series of V-shaped teeth or spines 21 inclining toward the outer ends of the burs.

In practice, a pair of the devices is, as shown in Figure 1, preferably interposed in a mining machine chain, the chain being indicated in this figure at 22 and the links of the chain at 23. The devices are preferably arranged at equally spaced points in the chain and it is now to be observed, as shown in Figures 6 and 7, that the outer end portions of the link bodies of the pair are deflected laterally in opposite directions with respect to the eyes 11 thereof. Accordingly, the burs of one of said devices will be directed downwardly while the burs of the other of said devices will be directed upwardly so that the burs of both devices will cover or occupy the full height of the cut of the chain. Accordingly, regardless of the point at which the core ledge may be uncovered in the cut by the cutting teeth of the chain, either one or the other or both of the devices of the pair will act upon the ledge.

In order to clearly bring out the manner of operation of the core breaker, I have, in Figure 5, shown the breast of a mine at 24 and the cut therein as made by the chain 22, at 25, while a core ledge, as exposed by the cutting operation, is indicated at 26. In the instance illustrated, it will be observed that the bur at one end of one of the devices will engage the lower face of the ledge while, as will be at once appreciated, the bur at the corresponding end of the other of the devices in the mining machine chain will engage the upper face of the ledge. Accordingly, as the chain travels, the burs will follow the channels formed by the cutters or bits and be caused to rotate against the ledge for chipping off the upper and lower corners thereof and wearing the ledge away as the cutting operation progresses and since the ledge will, of course, present an irregular surface to the burs, the burs will, in rolling over the ledge, be caused to pound or strike thereagainst so that the teeth 21 of the burs will act upon the ledge with a distinct pounding or chipping action. Since the burs are yieldably mounted, the burs may readily accommodate themselves to any irregularities in the width of the ledge and will also yield as the chain is fed forwardly in the cut.

Having thus described the invention, what is claimed as new is:

1. In a mining machine, the combination with a cutting element including links, of a core chipping bur yieldably mounted upon one of the links.

2. A core breaker including a link body,

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and a yieldably supported core chipping bur rotatably mounted thereon.

3. A core breaker including a link body having a recess, a core chipping member having a shank rotatably fitting in said recess, and means limiting the shank against displacement.

4c. A core breaker including a link body provided with a recess, a core chipping bur having a shank slidably and rotatably fitting in said recess, and a spring disposed within the recess to coact with the inner end of the shank yieldably supporting the bur.

5. A core breaker including a link body having a recess, a core chipping bur having a shank slidably and rotatably fitting in said recess and provided with a channel, means carried by the link body to project into said channel slidably and rotatably connecting the bur with the link body, and a spring disposed within the recess to coact with the inner end of the shank yieldably supporting the bur.

6. In a mining machine, the combination with a chain and cutters carried thereby, of a core breaker carried by the chain to follow the cutters and engage and break off portions of a core left by the action of said cutters.

7 In a mining machine, the combination with a chain and cutters carried thereby, of a core breaker carried by the chain independent of and following the cutters and movable into engagement with the projecting ledge of a core left by the action of the cutters to break off portions of said core during the cutting operation.

8. In a mining machine, the combination with a chain and cutters carried thereby, of a core breaker carried by the chain and operable upon the upper and lower faces of a core left by the action of said cutters with a continuous pounding action exerted at an angle to and in a direction towards the medial longitudinal portion of the core to chip ofl' portions thereof.

9. In a mining machine, the combination with a chain and cutters carried thereby, of a core breaker projecting laterally in the direction of its length from the chain and extending in the same general direction as said cutters.

10. In a mining machine, the combination with a chain and cutters carried thereby, of a core breaker following the cutters and having the base of its working portion disposed transversely to an axis extending laterally from the working side of the chain.

11. In a mining machine, the combination with a chain and cutters carried thereby, of a core chipping bur carried by the chain and rotatable about an axis extending laterally therefrom in a direction at substantially right angles to the direction of travel of said chain.

12. In a mining machine, the combination with a chain including a plurality of relatively stationary cutting bits, of a rotating element arranged between certain of the bits and adapted to break down cores or other material which resists the action of the bits.

13. I11 a mining machine, the combination with a chain and cutters carried thereby, of a core breaker rotatable about an axis extending laterally with relation to the line of travel of the chain and in the same general direction as said cutters.

14. In a mining machine, the combination with a chain and cutters carried thereby, of a tapered core breaker carried by and projecting laterally in the direction of its length beyond one side of the chain with its minor end outermost and having its working side presented in the direction of the line of travel of the chain.

15. In a mining machine, the combination with a cutting element including links, of core-chipping burs carried by one of the links with their axes extending laterally therefrom and disposed for successive engagement with a core ledge left by the action of the cutting element to break off portions thereof.

16. In a mining machine, the combination with a chain and cutters carried thereby, of a core breaker interposed between certain of the links of the chain and including a member extending laterally from and in the path of travel of the chain to impinge upon and break down the projecting ledge of a core left by the action of the cutters during the cutting operation.

17.'In a mining machine, the combination with a cutting element including links, of oppositely inclined core-chipping burs mounted upon certain of the links with their axes extending laterally from the cutting element and movable into engagement with the upper and lower edges of a core to break off portions thereof.

18. In a mining machine, the combination with a chain and cutters carried thereby, of a core breaker carried by the chain and including a plurality of revolving chipping burs disposed in staggered relation and having their axes extending laterally from the chain, said burs being operable to successively pound the projecting ledge of a core left by the action of the cutters whereby to remove the core by impact coincident with the cutting operation.

19. In a mining machine, the combination with a cutting element including links, of roughened conical core-chipping burs mounted for rotation on certain of the links with their axes extending laterally from the cutting chain, said burs being movable successively into engagement with the upper and lower edges of a core left by the action of the cutting element to break off portions thereof during the cutting operation.

20. In a mining machine, the combination with a cutting element including links, of a roughened frusto-conical chipping bur mounted for rotation on one of said links.

21. In a mining machine, the combination with a chain and cutters carriedthereby, of a core breaker carried by the chain and adapted to follow the channels produced by the cutters and break off portions of a core formed between the channels.

22. In a mining machine, the combination with a chain and cutters carried thereby, of a core breaker carried by the chain and movable into engagement with the projecting ledge of a core left by the action of the cutters to break off portions thereof upon deflection of the cutters.

23. The improved method of mining coal containing relatively hard cores which consists in cutting away the face of the wall of coal to expose a projecting ledge of the core and while cutting coincidently chipping said exposed core ledge to remove the same.

In testimony whereof I afl'ix my signature.

NEWTON K. BOWMAN. [1,. s.]