US365925A - Drill for mining purposes - Google Patents

Description

(No Model.)

W. H. LABIMER. DRILL FOR MINING PURPOSES.

Patented July 5, 1887.

WITNESSES N. FETERS, Phnlo-Lilhogmphur, Waafinglon. D. (1

UNITED STATES PATENT OFFICE,

\VILLIAM H. LARIMER, OF TERRE HAUTE, INDIANA.

DRILL FOR MINING PURPOSES.

SPECIFICATION forming part of Letters Patent No. 365,925, dated July 5, 1887.

Application filed February 23, 1887. Serial No. 228,607.

To all whom, it may concern.-

art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in drills for mining purposes; and it consists,substantially,in the same as constructed, and in such peculiar arrangement and combinations of parts as 'will hereinafter be more particularly described, and pointed out in the claims.

Heretofore in boring rock and coal deposits for creating a cavity or repository for a blasting compound by which to disintegrate or break up the mass into smaller fragments it has been customary in many instances to resort to the use of drills of-various forms of construction, and which in many instances produce or form openings whose diameter is of equal extent throughout, and frequently the drills have to be driven in to a considerable depth to produce openings large enough for the purposes required.

The object of the present invention is tosupply a device by which the interior extremity of the openings may be increased in capacity, whereby a greateramount of blasting compound may be inserted within amass of rock or coal deposit,to thereby more fully insure an equal separation or disintegration of the mass, all as will more fully hereinafter appear when taken in connection with the accompanying drawings, wherein Figure 1 represents a view of my improved drill as it appears in operation; and Fig. 2 is a view in detail of a portion thereof, showing the movable blades in an open position, and more fully indicating the construction thereof. Fig. 3 is a side View of Fig. 2. Fig. l is a similar view to Fig. 2, representing the movable blade as when closed, and Fig. 5 is aside view thereof.

Reference being had to the several parts by the letters marked thereon, A represents a drill embodying myimprovements, the same being (N0 model.)

preferably of the well-known anger style or form, and which, in order to illustrate one manner of using the same, is shown supported or mounted in suitable bearings, B, the drill being provided with a handle or crank, O, by which it is operated to be turned or revolved. The end of the drill is formed with a screwpoint, a, by which it is readily inserted or started, and it is also squared or flattened, as at b, and is formed at opposite sides with lugs or stops 0 c, for a purpose to be hereinafter set forth. I

D D represent blades or knives pivoted to the opposite sides of the flattened portion 1), the same having formed on their inner faoesa rib or flange, d. The opposite or corresponding edges of these knives are curved. or beveled, as at e, by which they are caused to separate or spread apart when brought into contact with the walls of the cavity that is to be enlarged, so as to obtain the proper position thereof to effect a cutting action. Thelugs or shoulders c c serve to prevent the knives or blades from beingspread too far backward, and they also serve to receive or sustain a part of the pressure necessarily exerted in the op eration of the drill, thereby relieving the pivot f from strain and preventing breakage thereof. The flanges or ribs d are for the purpose of preventing the blades from closing too far in or across each other by coming in contact with or abutting against the screw-point a; and it. will be seen on reference to Fig. 4 that when the blades are closed together their curved cutting-edges produce a notch or V- shaped opening, by which it is evident that when the drill is inserted in an opening, 9, previously formed in a mass of coal or rock, and the same pressed against the rear wall thereof,the said knives or blades will be caused to gradually spread outward as the drill is being operated.

The operation of myinvention is as follows: lVhen it is desired to increase or enlarge the capacity of a drill-opening in a mass of rock or coal, the drill A is projected into the opening and the same revolved or turned in the ordinary manner of operating a drill, and gradually as pressure is exerted the'knives will'cut away the portions around the opening with which they come in contact until they are spread apart to their fullest extent and made to rest or bear against the shoulders c 0, and it is evident that the said blades will act to cut out or increase the size of the cavity. In operation the screw-point a is continually entering the mass in advance of the blades, thus acting to start'a way for and as sist in the operation of said blades in that it breaks or loosens the particles of the mass.

From the foregoing description it is thought the construction and operation ofniy improved drill will be thoroughly understood, and I desire to state that I do not wish to be understood as limiting myself to the details of construction' and arrangements of parts as shown, for it is evident that various modifications or changes thereof could be resorted to and still come within the scope of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A drill of the character described, having knives or blades pivoted to its opposite sides whose corresponding edges are curved or beveled, the same being formed with the screw-point a, designed to operate in advance of the blades when revolved or rotated, and shouldersc c,limiting the spread of the knives, substantially as specified.

2. The combination, with thedrill formed with screw-point a, designed to operate in advance of the blades when revolved or rotated, and shoulders c c, limiting the spread of the blades, of the oppositely-pivoted blades B D, having ribs d on their inner faces designed to abut against the point a for preventing the said blades from crossing each other when closed together, substantially as described.

3. The oombinatiomwith a drill of the character described, formed with lugs or shoulders c c and screw-point a, and flattened, as at b, of knives D D, pivotally attached and formed with ribs (1 on their inner faces, substantially as set forth.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

WM. H. LARIMER.

Witnesses: V

W. H. SOALE, A. B. WILLIs.

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