US2289935A - Drill head - Google Patents

Description

July 14,1942.

DRILLHEAD Filed March 28, 1940 l 2 Sheets-Sheet 2 .lll

Patented July 14, 1942 DRILL HEAD Louis T. Rufus, Joliet, Ill.; Josephine G. Rufus administratrix of said Louis T. Rufus, deceased Application March 28, v194A), Serial No. 326,473

(Cl. Z55-69) 8 Claims.

This invention relates to drill heads and has relation more particularly to a device of this kind of a character to be welded on any conveyor auger and is also of a detachable toothed type.

It is a particular object of the invention to provide a structure wherein the cutting teeth are held from falling out of the head during and after drilling operations, and also to provide in a device of this kind teeth of a type which are reversible thereby materially prolonging the life of a tooth.

Another object of the invention is to provide a device of this kind wherein the detachable tooth is not wedged in place but is held in position by providing the tooth intermediate its ends with one or more shoulders with which coact parts carried by the head for maintaining a tooth in place- The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved drill head whereby certain important advantages are attained and the device rendered simpler, less expensive and otherwise more convenient and advantageous for use, as will be hereinafter more fully set forth.

The novel features of my invention will hereinafter be definitely claimed.

In order that my invention may be the better understand, I will now proceed to describe the same with reference to the accompanying drawings, wherein:

Figure 1 is a fragmentary view of a drill head and associated teeth constructed in accordance with an embodiment of my invention;

Figure 2 is a sectional view taken substantially n the line 2-2 of Figure 1;

Figure 3 is a sectional view taken substantially on the line 3 3 of Figure 1;

Figure 4 is a detailed sectional view taken substantially on the line 4--4 of Figure 1;

Figure 5 is a view in side elevation of a holding plate as comprised in this embodiment of my invention;

Figure 6 is a View in side elevation of the plate as illustrated in Figure 5;

Figure '7 is a view in elevation of one of the teeth as illustrated in the preceding figures unapplied;

Figure 8 is a fragmentary elevational view illustrating a drill head structure in accordance with another embodiment of my invention;

Figure 9 is a detailed sectional view taken substantially on the line 9 9 of Figure 8';

Figure 10 is an elevational view showing the teeth' and the holding plate or member as comprised in Figures 8 and 9 unapplied;

Figure 11 is a sectional view taken substantially on the line ll-II of Figure 10;

Figure l2 is a view in side elevation of the head as illustrated in Figure 8 but at the opposite side thereof with a portion broken away;

Figure 13 is a detailed sectional view taken substantially on the line I3--I3 of Figure l2;

Figure 14 is a fragmentary View partly in section and partly in elevation illustrating a further embodiment of my invention;

Figure 15 is a sectional view taken substantially on the line I5-l5 of Figure 14;

Figure 16 is an elevational View illustrating tooth constructed in accordance with a further embodiment of the invention.

In the embodiment of the invention as particularly illustrated in Figures 1 to 7 inclusive, H denotes a head cf desired configuration and dimensions and which is adapted to be welded in a Well-known manner to a conventional conveyor auger such as is used in the mining of coal.

The outer portion I of the headI-I is broad with its outer end face outwardlj7 converging to a point substantially at the transverse center of the head. The outer portion I of the head H at opposite sides of its transverse center is of increased thickness as indicated at 2 and 3 with said thickened portions disposed in opposite directions as particularly illustrated in Figure 3. These portions 2' and 3 have disposed therethrough the openings 4 which, of course, are at vthe opposite sides of the portion I but are disposed inwardly in convergence and each of said openings is also disposed lengthwise on a suitable curvature to readily accommodate an end portion 5 of a tooth T. Each of the openings 4 has its inner portion reduced at one side to provide an internal shoulder 6 for a purpose to be hereinafter more particularly referred to.

The tooth T is disposed lengthwise on a suitable curvature and one 4end portion of the tooth is laterally offset, as at 1, with respect to the other resulting in the shoulders 8 at opposite sides of the tooth T with one of the shoulders a slight distance in advance of the other. The opposite end portions of th'e tooth T are in duplicate so that in use the tooth may be readily reversed as the requirements of practice may necessitate whereby the life of a tooth may be materially prolonged.

The outer end of the head H at the apex portion thereof is provided with an axially disposed socket 9 in which is to be inserted free of any wedging action an end portion of a holding plate I0. This plate I while substantially snugly received within the socket 9 is freely applied or removed. The plate IE), however, is held in applied or working position Within the socket 9 through the medium of a key I I herein disclosed as a headed pin inserted through registering openings I2 in the head H and the plate I0. The plate ID is of such a length as to have an end portion thereof disposed substantially exteriorly of the head when the plate is positioned within the socket 9, and said extended portion is provided with a transversely disposed head I4 extending a slight distance beyond each side of the plate Ill. The extended portions of this head I4 at the rear thereof are provided with the oppositely directed fingers or lugs I5 substantially at right angles 'to the plate I0 for contact with the outer shoulders 8 of the applied teeth T to hold the inner shoulders 8 of the applied teeth in close Contact with the internal shoulders 6 whereby the teeth T are effectively maintained in applied or working position. The plate II] may be readily removed and replaced thus allowing the teeth T when desired to be reversed or replaced in an extremely easy manner yet without in any way retarding the effectiveness of the applied teeth during a working or cutting operation.

In the embodiment of my invention as just described it is believed to be obvious that only a single holding member, such as the plate I0, is required in order `to hold the teeth T in effective position with respect to the head I-I.

As clearly indicated in Figure 3, the outer ends of the openings 4 and the socket 9 are in communication and, therefore, it is believed that for the purpose of coverage the socket 9 and the openings 4 can be identified in the claims as a single opening- In the embodiment of the invention as illustrated in Figures 8 to 13 inclusive, the drill head D is of `a type wherein each of the enlargements I6 and I'I at opposite sides of the head D have associated therewith two cutting teeth C. These cutting teeth C are similar in form and construction as the teeth T hereinbefore described yet in connection with each pair of teeth C a different retaining or holding means is used,

In this embodiment of my invention the enlargement I6 has disposed therethrough a single relatively large opening I8 provided at its forward end and at the outer side thereof with a transverse enlargement providing a shoulder I9 with which contacts one of the intermediate shoulders of a `tooth C. .Snugly' engaged through the opening I8 is a holding plate 2I.

The under surface of this plate 2I is cut out therealong to provide the rabbets 22 separated by a fiange 24. The forward end portion of the 60 ange 24 is formed to provide at opposite sides thereof the spaced shoulders 25 which are contacted by certain of the shoulders 2U ofthe applied teeth C as is clearly illustrated in Figure 10 of the drawings. The outer end of the plate 2I to one side `thereof is provided with a lug 2S formed to have -close contact with the outer forward shoulder 2l] of one of the teeth C as is also clearly illustrated in Figure 10.

The plate 2|, with the applied teeth'C, is inserted from without through the opening I8 until the inner shoulder 20 lof the applied tooth substantially diagonally opposed `to the lug 2B has contact with the Vshoulder I9 within the enlarged portion YIIz of the head D. After this placement a holding key 2'I is inserted through registering openings 28 in the inner portion of the plate 2| and the head D. As is illustrated in Figure 8, this plate 2! is of a length to extend beyond the inner end of the enlargement I6 when in applied or working position. The eX- tent of insertion of the plate 2I inwardly of the opening I8 is also limited by the Contact of the outstanding flange 29 at the forward end of the plate 2I with the outer face of the enlargement I6 of the head D.

The teeth C which coact with the enlargement I'I at the side of the head D opposite to the enlargement Ii each has an end portion insertible through an individual or separate opening 30 and each of these openings is provided with an interna-l shoulder 3l with which coacts the inner shoulder 25 of an applied tooth C.

Insertible through the outer portion of the enlargement I'I and intersecting the openings 36 are the legs 32 of a U-shaped holding key 33. The openings 34 in the head D, or more particularly the enlargement I'I, are so positioned as to have the legs 32 closely adjacent to the forward shoulders 20 of the applied teeth C whereby said teeth are effectively maintained in assembled position. The U-shaped holding key 33 or-its equivalent is employed in this embodiment of my invention as such holding means can be provided to better advantage in connection with the holding plate 2 I.

In the embodiment of the invention as illustrated in Figures 14 and 15, the holding plate 35 is inserted through a suitably provided opening in the drill head and is maintained in position by a suitable key passing through the opening 36 in the'inner end of the holding plate 35. The cutting tooth A has its opposite end portions transversely offset, as at 31, with the opposite end portions of the tooth A in duplicate. The outer end of the member or plate is provided with an outstanding perpendicularly related ange 39 having therethrough an opening 39 through which an end portion of the tooth A is inserted, the offset portion 3l of the tooth providing shoulders to limit the extent of such insertion and for effectively maintaining the tooth A in place.

In Figure 16 of the drawings lis illustrated a tooth B wherein the desired intermediate spaced shoulders 49 are provided by notching, as at 4I, the opposite longitudinal marginal portions of the tooth B.

From the foregoing description itis thought to be obvious Ythat a drill head constructed in accordance with my invention is Vparticularly well adapted for use by reason of the convenience and facility with which it may be assembled and operated, and it will also be obvious that my invention is susceptible of lsome change and modification without departing from the principles and spirit thereof and for this reason I do not wish to be understood as 'limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice except as hereinafter claimed.

I claim:

1. In a drill, the combination of a drill 'head having an opening, an elongated reversible cutter laterally offset at substantially its longitudinal center lproviding oppositely directed shoulders at opposite sides of the cutter, either portion of the cutter at the opposite sides of the offset being insertible within lthe opening of the head, and removable Vmeans coacting with the head and one of the shoulders of the applied cutter to hold ,the cutter against outward movement with respect to the head, said means including a freely removable key, said removable means as a unit being positioned a material distance inwardly of the outer end of the cutter.

2. In a drill, the combination of a drill head having an opening therein, a pair of elongated cutters insertible within said opening, each of said cutters being reversible and having oppositely facing shoulders in its central part, a holding plate insertible within said opening between the cutters, said plate having parts engageable with certain of the shoulders of the cutters to hold the cutters in applied position, and removable means for maintaining the plate in Working position.

3. In a drill, the combination of a drill head having an opening therein, a pair of elongated cutters insertible Within said opening, each of said cutters being reversible and having oppositely facing shoulders in its central part, a holding plate insertible within said opening between the cutters, said plate having parts engageable with certain of the shoulders of the cutters to hold the cutters in applied position, removable f means for maintaining the plate in working position, and means for limiting the extent of insertion of the plate and cutters within the opening.

4. In a drill, the combination of a drill head having an opening therein, anelongated reversible cutter provided substantially midway its ends with oppositely facing shoulders, either end portion of the cutter being selectively inserted within the opening of the head, a plate removably insertible within the head to a position offset with respect to the applied cutter, and a laterally disposed part carried by said plate contacting with a shoulder of the applied cutter for holding the cutter against outward movement.

5. In a drill, the combination of a drill head having an opening therein, a pair of elongated cutters insertible within said opening', each of said cutters being reversible and having oppositely facing shoulders in its central part, and a holding vplate insertible within said opening between the cutters, said plate having parts engageable with certain of the shoulders of the cutters to hold the cutters in applied position.

G. In a drill, the combination of a drill head having openings therein, cutters insertible within said openings, each of said cutters being reversible and having oppositely facing shoulders in their central portions, and a holding member removably carried by the head and having parts contacting with the forwardly disposed shoulders of the applied cutters to hold said cutters against 'outward movement said holding member as a unit being lpositioned a material distance inwardly of the outer extremities 0f the cutters, the openings in the head being in different planes, said head between such openings being provided with an additional opening in which the holding member is insertible.

7. In a drill, the combination of a drill head having an opening therein, elongated cutters insertible within said opening, each of said cutters having oppositely facing shoulders, a holding plate insertible within said opening between the cutters, said plate having parts engageable with certain of the shoulders of the cutters to hold the cutters in applied position, and removable means for maintaining the plate in working position.

8. In a drill, the combination of a drill head having an opening therein, elongated cutters insertible within said opening, each of said cutters having oppositely facing shoulders, a holding plate insertible within said opening between the cutters, said Plate having parts engageable with certain of the shoulders of the cutters to hold the cutters in applied position, and a member freely insertible Within the drill head and through the inserted portion of the applied plate for holding the plate and cutters in position.

LOUIS T. RUFUS.

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