US1614123A - Drill-steel centralizer - Google Patents

Description

C. C.-HAN$EN DRILL STEEL CENTRALIZER Jan. 11 1927.

Filed July 27. 1926 IN VENT OR THUJ.

I H/J Ar ORNEY.

Patented Jan. 11, 1927.

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CHARLES C. HANSEN, OF EASTQN, PENNSYLVANIA, ASSIGNOR TO ENGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATIGN OF NEVT JERSEY.

DRILL-STEEL CENTRALIZER.

Application filed July 27,

This invention relates to rock drills ot the hammer type and especially to a device for the purpose of centralizing the drill steel. The invention provides features of novelty when applied to guiding and centralizing the drill steels of channeling drills.

An object of this invention is to cause the drill steel to strike repeated blows on the same spot during the process broaching or of starting the hole to be drilled, especially when the rock surface is inclined to the axis oi the drill steel.

further objects of this invention will hereinafter appear and can be more clearly explained by reference to the accompanying drawings in which Figure 1 is a side view of the end of drill shell with the centralizer mounted thereon and the drill steel in its proper position with respect to the drill shell and the drill centralizer,

Figure 2 is an enlarged cross sectional view of the centralizer,

Figure 3 is a longitudinal sectional view ot the centralizer showing the wearing blocks in position and showing the method of attaching the centralizer to the drill shell,

Figure 4 is a longitudinal sectional view of the centralizer showing a pair of wearing blocks removed to receive a drill steel of rectangular cross section, as for instance a channeling bar, and

Figure 5 is a perspective view of one of the removable wearing blocks.

Referring to the drawings a rock drill front head A is part of a suitable rock drill n'iounted on the shell B. A drill steel G extends in the well-known manner into the trout head A to receive blows of impact delivered by the hammer piston or anvil block, (not shown) depending on the type of rock drill employed. The rock drill is slidably mounted upon the shell B and may be moved forward or backward in order to keep the cutting end of the drill steel C in contact with the rock or to remove the tool from the hole. This longitudinal movement may be accomplished by means of a feed screw (not shown). The function of the centralizer is to keep the bit E of the drill steel O on the desired point on the rock while permitting longitudinal motion of the drill steel C. Motion in any other directien is prevented.

Centraiisere especially adapted to be 1926. Serial No. 125,239.

used in certain quarrying methods which require that a row of holes F (Fig. 1) be drille l to a certain depth and that the par titions' or walls between these holes be broken out'by means ot a specially shaped drill steel, known as a channeling or broaching bit.

in accordance with the above mentioned requirements the centralizer includes a frame rigidly secured to the drill shell i? (Fig. 1) by bolts J extending longitudit ot the shell. The frame H is spaced from the end oi the shell B by suitable 's'l PZXCGIS or washers J about the bolts J. Freterably the frame H is U shaped havng outwardly extending arms H on either side of the drill steel C. Each arm H is tormei of two projections between which a bolt K is pivotally mounted, the threaded end of the bolt K being adapted to extend beyond the ends of the arm H.

In order to secure wearing blocks N firmly in place, a wearing block 0 is provided closely fitting within the parallel arms of the primary yoke M and secured thereto by means of bolts P. In addition to securing wearing blocks N firmly in place, the wearing block or secondary yoke 0 provides a suitably shaped recess for a drill steel of different cross sectional shape it the wearing blocks N are removed.

Between the arms H" the U shaped yoke M is adapted to be reinovably securedby the bolts K.

The drill steel C is adapted to be held slidably in place by means of the wearing blocks 0, N and Q. These blocks placed in the positions described form a cylindrical opening R to accommodate the round drill steel C.

Figure 5 shows the shape of each of the wearing blocks N. This block has two parallel faces N. a concave face S to bear against the steel 0, an opposed plane face T and a head or flange to assist in holding the blocks N in position between the blocks 0 and Q.

In Figure 3 the wearing blocks N are shown in place. This assembly shows in dash-dot lines a round drill steel C occupying the cylindrical recess formed by the wearing blocks N, the secondary yoke or wearing block 0, and the wearin block Q.

in Fig. 4 the wearing blocks i and the round driil steel G are removed and lUD tzzngnlar drill steel G placed in the rectangular recess so formed,

The flanges V (Figs. 1: and 5) are for convenience in assembling and to insure accurate placing of the blocks N and Q and the secondary yoke 0.

Special advantages of this invention are the convenience of assembly and the rapidity with which the round drill steel may be replaced by one of rectangular cross section. To accomplish this change the drill steel is first withilrmvn from the hole F in the rock by means of the longitudinal. teed screw, the bolts K are loosened and swung sideways to permit removal of yoke M and the blocks N and the rectangular broaching steel G in placed in the centralizer leaving out the blocks N and relastening the yoke M in place by means of the bolts K.

I claim:

A drill steel contralizer comprising a frame, a pair o l pivotally mounted loohts a yoke clamped rigidly to said frame by means of said bolts and having two parallel arms, and removable Wearing blocks ir said yoke, said yoke holding Said Wearing blocks firmly in place, a pair of said wearing blocks adapted to be removed to ILCQQ UHLEOLlH IG drill steels of ditl'ercnt cross sectional shape.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN.

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