US2480372A - Reamer for earth drilling - Google Patents

Description

A 1949- c. w. KANDLE 2,480,372

REAMER. FOR EARTH DRILLING Filed April 27, 1945 By J II/IIIIIIIIIIIIIIlII/fl IN V EN TOR.

4 ttorrieq Patented Aug. 30,1949 2,480,372

" tamer Enron EAR rn'nnip mG I Application April 27, 1945, Serial No, 590,622

2 Claims. (Cl. 255-69) 7 l 2 This invention relates to a ream'er for earth hold the flight 6 which is suitably welded thereto. drilling and is particularly applicable to the drill- The head 3 is removably secured to the lower end ing of holes with drills of the type set forth in of shaft 1. U. S. Patent No. 2,320,612, and the co-pending The flight 6 and shaft 1 may be made up in application, Serial No. 504,343 filed September 30, suitable sections attachable end to end to provide 1943, for Earth drill, now Patent No. 2,401,250, by for the drilling of holes to different depths. the present inventor. The pilot 2 comprises a cylindrical casing 8 Portable drills of the auger type with a cutting held in place by a bottom end plate 9 and a top head have proven to be very successful so long end plate I0. Abolt ll extends vertically upward as the bite is not excessive. When drilling holes 10 through the center of plates 9 and Ill and threads in excess of twelve to fourteen inches in diameter into the lower end of shaft 1 in the place norit becomes necessary to extract the drill from the mally provided for the attachment of a lead screw.

hole frequently to remove the spoil. This, togeth- The top plate Ill and upper end of cylinder 8 have er with the fact that large diameter drills are a substantially radial slot l2 for receiving the heavy, makes for considerable work and loss in blade 5 of the cutting head. time. The diameter of the head 3 and flight 6 is that The principal object of the present invention is normally required for the drilling of a hole l3 to provide for first drilling the hole with a lighter of the size desired. The diameter of the pilot 2 weight drill of smaller diameter and subsequently is less than that of the head 3 and is substantially reaming the hole with the larger diameter drill. that of the hole M to be reamed. Usually the head Another object of the invention is to provide an 3 and its blade 5 overhangs the pilot 2 on about a apparatus for reaming earth holes. two inch radius, providing for a two inch cut at Another object is to provide an attachment for. the circumference of the hole during reaming. an earth drill to center the same in a hole for Cuts as large as four and five inches may be emreaming. ployed.

Another object is to prevent falling of spoil into The pilot 2 enters hole l4 ahead of the drill l the drilled hole during reaming, and to more efiecand centers the latter so that the reamed hole 13 tively remove the spoil from the hole. will be substantially concentric to the original The invention is illustrated in the accompanyhole The length f pilot 2 Should b Sufficient, ing drawing in which: having regard for its fit in hole 14, to prevent Figure 1 is a vertical section through a hole falling of spoil into the hole during r min in th ground and the apparatus showing a re m- Shaft 1 is rotated by the motor l5 which is deing operation partially completed; tachably secured to the upper end thereof.

Fig. 2 is an enlarged side elevation of the pilot The pilot 2 can be readily assembled and at- -and lower end of the drill with parts broken away tached to the drill I in place of the usual lead and sectioned; screw, and when the reaming is complete the Fig. 3 is a transverse horizontal section taken pilot may be removed, releasing the drill for drillon a line 3-3 between the pilot and the cutter ing operations.

head; and Various embodiments of the invention may be Fig. 4 is a vertical section taken across the cutemployed within the scope of the accompanying ting blade on line 44 of Fig. 2. claims.

The apparatus comprises the usual drill I and I claim: a pilot 2 secured to the bottom beneath the cutting 1. In combination with a drill for earth boring head. having a substantially horizontal head with an The drill may comprise a flat horizontal ciropen segment therein having a transverse cutting cular head 3 with an open sector 4 having a cutblade extending downwardly at a cutting angle at ting blade 5 extending downwardly and forwardly the rear edge of said open segment, a cylindrical at the rear edge of the sector, and a spiral flight pilot detachably secured beneath the drill and 6 for lifting spoil as it passes upwardly and over adapted to fit into a previously drilled hole of the blade. The central vertical shaft I serves to smaller diameter than the drill to center the drill for reamin operations and prevent falling of spoil into the hole during reaming, said pilot comprising a cylindrical casing, a bottom closure plate, a top closure plate disposed to substantially close said open segment in said head, and a central vertical attaching bolt securing the pilot axially to the drill, and said top plate and easing having a slot therein to accommodate the cutting blade of the drill.

2. In combination with a drill for earth boring having a substantially horizontal head with an open segment therein having a transverse cutting blade extending downwardly at a cutting angle at the rear edge of said open segment, a. cylindri cal pilot detachably secured beneath the drill and adapted to fit into a previously drilled hole of smaller diameter than the drill to center the drill I for reaming operations and prevent falling of spoil into the hole during reaming, said pilot eomprn ing a cylindrical casing secured up against the bottom of the drill head, a transverse member REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 7 152,101 Moinsen 1= 'Juh 16, 1874 161,190 Youn Mar. 23, 1875 674,549 Wren May 21, 1901 1,724,005 Christensen Aug. 13, 1929 1,822,316 Hartson Sept. 8, 1931 2,009,168 Dittmer July 23, 1935 Kandle June 1, 1943

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