US3164914A

US3164914A - Slusher scraper structure

Info

Publication number: US3164914A
Application number: US259960A
Authority: US
Inventors: John A Wilson
Original assignee: FAHRALLOY Canada Ltd
Current assignee: FAHRALLOY Canada Ltd
Priority date: 1963-02-20
Filing date: 1963-02-20
Publication date: 1965-01-12
Anticipated expiration: 1982-01-12

Description

Jan. 12, 1965 J. A. WILSON SLUSHER SCRAPER STRUCTURE Filed Feb. 20, 1963 BAIEN T AGENT United States Patent 3,164,914 SLUSHER SCRAPER STRUCTURE John A. Wilson, Orillia, Ontario, Canada, assignor to Fahralloy Canada Limited, Grillia, Ontario, Canada Filed Feb. 20, 1963, Ser. No. 259,960 3 Claims. (Cl. 37-447) This invention relates to slusher scrapers and more particularly to the nose shoe structure thereof.

Slusher scrapers are widely employed in mining and like operations for scraping ore or rock from Working faces. The conventional scraper is of simple construction and comprises a back plate carried by a pair of arms, and a nose shoe. The nose shoe assists in tying the ends of the arms together, provides protection for the ends of the arms by means of a runner incorporated in it, adds weight to balance the assembled scraper, and includes an eye to which a pull cable is attached either directly or through hitches of various types. The nose shoe is usually a separate element which is normally bolted to the arms to facilitate replacement in a mine working place. More over, most scrapers have to be knocked-down in transporting them underground, and then reassembled in the working place. Bolting has thus been considered the normal manner of fastening the nose shoe to the arms. Attempts have been made to simplify the nose shoe attachment means and to provide an interlocking arrangement between the arms and the nose shoe whereby depending on the bolts as the sole attachment means, as well as the stress on the bolts, is reduced. As a consequence, the number of bolts required is reduced. However, it appears that, in substantially all presently available scrapers, at least one bolt is required to secure the nose shoe to the arms.

It is an object of this invention to provide a slusher scraper having a nose shoe which is of simple form and manufacture but which requires no bolts or separate fastening means for attachment to the scraper arms, and which possesses fully adequate operating strength while permitting ease of assembly with and disassembly from the other elements of the scraper.

The inventionwill be described with reference to the accompanying drawing, in which FIGURE 1 is a perspective view of a scraper in accordance with the invention, and

FIGURE 2 is a partial sectional plan view.

In the drawing, the scraper blade or back plate of the scraper is indicated at and is carried by a pair of arms 11 which are flared inwardly towards each other, as shown, and which have free opposed end portions 12. Each arm has a shoulder or stop 13 projecting laterally outwardly from the outer side surface of the end portion 12 and a second shoulder or 'stop 14 also projecting laterally outwardly from the outer side surface of end portion 12 and in spaced relation to shoulder 13. Each end portion 12 has a generally flat inner surface 15 which is tapered or inclined in converging relation towards the opposed surface 15 of the other end portion 12.

A nose shoe 16 comprises a hollow, open-ended, box section 17, rectangular in cross section, and having a runner 18 depending therefrom.

A wedge 19 having tapered or converging side surfaces 20 is provided with an end section 21 having an eye 22 therein.

The nose shoe is attached to the end portions of the ICE arms 11 by initially pressing such end portions tightly together, the wedge 19 being out of position. In this position, the box section 17 may be moved over the ends of the arms and in encircling relation thereto to a final position between stops 13 and 14.

The wedge 19 is now driven into position between the surfaces 15 of the arms and through the box section 17. Driving of the wedge spreads the arms, forces the outside surfaces of the arms, between shoulders 13 and 14 tightly against the inside faces of the box section, and thereby locks the assembly rigidly together.

The distance between shoulders 13 and 14 is approximately equal to the length of the box section 17 and thus movement of the shoe is restricted by such shoulders. The wedge surfaces 20 are in snug engagement with the surfaces 15 of the arms when the box section is firmly seated between shoulders 13 and 14. Thus, the wedge cannot be pulled or driven completely through the assembly. In the locked position of the wedge, the eye section 21 is exposed, as shown, to permit fastening of a pull cable 23 or the like thereto.

It will be apparent that, when the scraper is moving forwardly, pulling ore or rock, the forces acting through the pull rope impose a tightening action on the wedge and the nose shoe assembly. However, when the empty scraper is pulled back to the Working face for another load, the stress applied is not such as to loosen the assembly.

The scraper described possesses a number of advantages, some of which may be listed as follows:

(1) Since the scraper eliminates the use of bolts, welding, and like fastening means, assembly and disassembly is greatly facilitated.

(2) The structure results in a rigid assembly at all times, with consequent greater operating efficiency. Bolted assemblies habitually loosen because of stretching or breakage of bolts.

(3) Maintenance costs are reduced since the bolts in conventional assemblies must be regularly tightened and replaced during the service life of the scraper.

(4) The structure described permits ease of knocking down and re-assembly, since only the use of a simple tool, such as a sledge hammer is required. This is an important consideration in a mine working place where it is difficult to obtain tools.

(5) Replacement of nose shoes (a periodical requirement in the life of a scraper) is a simple step.

I claim:

1. A slusher scraper comprising a scraper blade, a pair of arms carrying said scraper blade and having opposed end portions, each said end portion having an inner face, said inner faces being in confronting relation and in converging relation towards each other, each said end portion having an outer face and a pair of spaced shoulders projecting laterally outwardly from said outer face, a wedge disposed between said inner faces and having converging faces in engagement with said inner faces, and a nose shoe having a ground engageable runner thereon and a hollow box section encircling said end portions of said arms and said wedge, said box section having end edges disposed between each said pair of shoulders.

2. A slusher scraper as defined in claim 1, said wedge having an eye-containing end section.

3. A slusher scraper comprising a scraper blade, a pair of arms carrying said scraper blade and having opposed end portions, each said end portion having an inner face,

3 4 said inner faces being in confronting relation and in conshoulders, and said wedge having an exposed eye-converging relation towards each other, each said end portaining end section.

tion having an outer face and a pair of spaced shoulders e th' PIOJCCUHg laterally outwardly from said outer face, a Referenc S Cited m the file of 18 Patent wedge disposed between said inner faces and having com- 5 UNITED STATES PATENTS plementary converging faces in engagement with said in- 801,707 Becker Oct. 10, 1905 ner faces, and a nose shoe having a ground engageable 1,611,296 West Dec. 21, 1926 runner thereon and a hollow box section encircling said 2,743,540 Whisler May 1, 1956 end portions of said arms and said wedge, said box section having end edges disposed between each said pair of 10 FOREIGN PATENTS 855,904 Great Britain Dec. 7, 1960

Claims

1. A SLUSHER SCRAPER COMPRISING A SCRAPER BLADE, A PAIR OF ARMS CARRYING SAID SCRAPER BLADE AND HAIVING OPPOSED END PORTIONS, EACH SAID END PORTION HAVING AN INNER FACE, SAID INNER FACES BEING IN CONFRONTING RELATION AND IN CONVERGING RELATION TOWARDS EACH OTHER, EACH SAID END PORTION HAVING AN OUTER FACE AND A PAIR OF SPACED SHOULDERS PROJECTING LATERALLY OUTWARDLY FROM SAID OUTER FACE, A WEDGE DISPOSED BETWEEN SAID INNER FACES AND HAVING CONVERGING FACES IN ENGAGEMENT WITH SAID INNER FACES, AND A NOSE SHOE HAVING A GROUND ENGAGEABLE RUNNER THEREON AND A HOLLOW BOX SECTION ENCIRCLING SAID END PORTIONS OF SAID ARMS AND SAID WEDGE, SAID BOX SECTION HAVING END EDGES DISPOSED BETWEEN EACH SAID PAIR OF SHOULDERS.