US752494A - Reamer - Google Patents

Description

atented February 16, 1904.

PATENT OFFICE.

LEROY wEn'rs, or MILEoED, MISSOURI.

FIEAIVIER.v

SPECIFICATION forming part of Letters Patent No. 752,494, dated FebruarylG, 1904. Al-)plicationfiled February 2, 1903. Serial No. 141,557. (No muiiel.)

To all whom it may concern/.1

Be it Vknown that I, LEROY VVnRTs, a citizen of the United States, residing at Milford, in the county of Barton and State of Missouri, have invented new and useful Improvements in Reamers, of which the following is a-speci fication.

My invention relates to a reamer for enlarging the ends or any other portion of blasting-holes drilled in coal-mines. The object of reaming such holesV to larger diameter is to permit the miner to bed Vthe powder (or dynamite) all in a bunch and to give the powder a shoulder, so to speak, to push against in exploding, the effect of which is that with rearned holes a given quantity of powder will do more execution than in the usual holes having uniform diameters.

Referring now'to the drawings, Figure 1 is a partly-sectional elevation of a reamer embodying my inver tion, the cutters being separated, the coal or other material in section, the stand in section, and the tubular screw partly in section. Fig. 2 is an enlarged longitudinal sectional view of two portions of the tubular shank, two portions of the rod 14,`

and a portion of the rod 16. Figf is' an end elevationof the cutters and the guide-piece in which they are mounted. Fig. 4 is a longitudinal section, on the same scale as Fig. 3, of the cutter-guide and a portion of the tubular shank, showing also the wedge and a portion of its rod, the cutters being for clearness omitted. I

Fig. 1 represents one of my reamers embedded in a hole which has previously been drilled in the coal by a coal-drill. 1- and 1 are the cutters by which the reaming is done. These cutters are arranged side by side in a longitudinal slot 3 of a casting or forging4, termed hereinafter the cutter-guide. The inner ends of the cutters 1 are pivoted, respectively, on pins 6 and 6, which are securedin the cutter-guide 4 across the slot 3. The ends of the cutters project beyond the end of the cutter-guide, and the outer edges of the cutters may be beveled or sharpened, asy shown in Fig. 4.' v

The inner end of the cutter-guide 4 is tubular and is rigidly secured upon the end of a tubular shank 7. The opposite end of this shank 7 is detachably secured to or within the end of a tube 8 provided with external screwthreads and referred to hereinafter as the tubular screw. Said tubular screw is mounted in a two-piece boxing 9, which is supported in the usual'manner by a regular coal-drill stand 10, which is not shown in detail, as its construction is well known in mining. The drill with which the blast-hole has been made has been removed from the stand 10 and the tubular screw 8 has been attached in its place. On the outer end of the' tubular screw 8 is secured 1a crank 12, by which said screw may be rotated, and thereby advanced, causing the shank 7 and the cutters 1 to advance into the hole.

The inner edges of the cutters 1 are tapered,

as shown, and between said` tapering edgesY lies a metallic cone or wedge 13, which is secured upon the end of a rod 14. This rod 14 extends throught a portion of the cutter-guide 4 and back through the tubular shank 7. Its

opposite end is pointed. Another rod 16,

which is. virtually an extension of rod 14, lies within the tubular screw 8 and projects from the outer end thereof; Acrank 17 is Xed on this end of said rod, and adjacent to said crank the rod is externally threaded. The end portion of the tubular screw 8. is internally threaded to engage the threads of rod 16. ,The end of said rod 16 adjacent to the pointed end of rod 14 is recessed to receive said pointed end.

The two rods 14 and 16 are provided instead I of a single rod, so that when the tubular shank 7 is detached from the tubular screw 8 the rod 14 may remain within said shank, as will be readily understood. The rod 14'is pressed backwardly against rod 16 by an expansionspring 18, which is confined between a collar 19, secured within the shank 7, and a collar 20, secured upon said rod.

The operation of the reamer is as follows: The rod 16 is retracted by turning its crank 17 far enough to permit the spring 18 to pull back the wedge 13 for the purpose of turning the cutters inwardly, so that they will not project laterally from their guide 4. The diameter of the guide 4 is a little less than that of the average blast-hole-r. e., two inches.

IOO

The ends of the cutters are inserted in the hole, (after the tubular screw 8 has been drawn clear back by turning its crank 12,) and the f stand 1.0 is madeV secure in the usual manner.

Then the main crank 12 is turned in the proper direction to advance the cutters l through the hole tothe point desired to be reamed. When such a point is reached, the other crank, 17, is turned in the proper direction to force the Wedge 13 forward between the cutters. This movement projects the cutters a suitable distance from theperiphery of the guide Ljr-say one-eighth inch. Then the cutters are revolved by turning the main crank 12 until the hole is enlarged, say, one-fourth inch. Then the cutters are further separated or projected by turning crank 17 and again revolved by turning the main crank 12. Thesev operations are repeated-until the diameter of the enlarged portion of the hole is about four inches. The Wedge 13 is then withdrawn to its initial position and the entire apparatus is removed from the hole. Thus a powder-pocket has been Jformed in the hole. The cuttings removed by the cutters may be removed from this pocket by any suitable means. The ad.-

vantages of forming these pockets have bee stated hereinbefore.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent. of the United States, is-

The combination with a drill-stand of a tubular screw mounted therein, a crank on one end of said screw, a tubular shank secured to the opposite end of said screw, a cutter-guide secured to the end of said shank, said cutterguide having a longitudinal slot therethrough and its inner end tubular, two cutters pivotally mounted within said slot, the edges of said cutters being beveled, a wedge between the inner edges of said cutters, a rod Vsecured to said wedge and extending through said shank into the tubular screw and having its upper end drawn to a point, a rod externally screw-threaded to fit into and pass through the upper end of the tubular screw, the said rod being so disposed and constructed that its lower end will t onto the upper end of the first-mentioned rod.

In testimony whereof I aHX my signature in the presence of two witnesses.

LEROY wERTs.

Witnesses: C. R. FURRoW,

W. H. DAY.

Images