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| Shelf anchor |
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| Rail mounted cranes |
| I claim: 1. Single beam overhead travelling crane comprising an elongated box girder shaped rail ... |
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| Eyeglass case display unit |
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| Devices for supporting saddles |
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| Reinforced, light-weight pallet |
| It is therefor an object of the present invention to provide a strong, light-weight pallet ... |
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| Bottle support apparatus |
| I claim: 1. An apparatus for supporting a plurality of bottles in a slanted position, comprising a ... |
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| Assembly system with clip for installing marble panels |
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| Fastener for cementitious substrate |
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Drill bit
| Details |
Inventors: Leibee, Donald L.; Crist, Owen K.;
Assignee: The Marmon Group (Chicago, IL)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A drill bit for use in combination with a through-the-steel drill stem, the drill bit including an elongated body portion having a bore through which cuttings may be removed through the drill stem, a web for receiving a drill tip, and a sleeve attached about the body portion thereof, the web thereof having axially extending faces coutoured from the periphery of the body portion toward the axis thereof, and the sleeve extending from the body portion and in spaced apart axial relation to the contoured faces of the web in a manner to define drill cut receiving ports opening upwardly to the drill tip and downwardly to the bore of the body portion. The drill bit may be provided with a male keeper or retainer to mate with a complementary female receptor of the drill stem for interconnection of the drill bit to the drill stem. |
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DETAILED DESCRIPTION In the drawings, wherein similar reference characters designate corresponding parts throughout the several views, the letter A may generally designate the drill bit as shown in FIGS.
1 through 7 and the letter B the drill bit as shown in FIGS.
8 and 9.
Drill bit A preferably comprises an elongated body portion 10, drill tip 11, and sleeve means 12.
As shown, elongated body portion 10 is of a cylindrical configuration, as is sleeve means 12.
As is apparent, body portion 10 may have other than a cylindrical periphery, polygonal for instance.
Sleeve means 12 may also be configured other than cylindrical.
The upper end of body portion 10 is provided with a web 13 and has an interior axial bore 14 opening to the lower or shank end thereof.
At least the lower portion of bore 14 may be of such as a hexagonal configuration defining a socket 15 within which to receive the correspondingly hexagonal end of a through-the-steel drill stem (not shown).
A female receptacle 16 may be provided through body portion 10, adjacent the lower end thereof, for receiving the mating male keeper of the drill stem (not shown) whereby to attach drill bit A to a drill stem.
Web 13 extends transversely across bore 14, from side-to-side of body portion 10, and is provided with upstanding opposed crown portions 17 and 18 which define therebetween a slot 21 within which drill tip 11 may be mounted and secured such as by brazing.
Opposed sides of web 13 are cut away, preferably in the nature of a hemisphere, to provide contoured faces 23 and 24 extending axially of and from the periphery of body portion 10, opening at one end thereof to bore 14.
The other end of face 23 opens to cutting edge 26 of drill tip 11 and the other end of face 24 opens to cutting edge 27 of drill tip 11.
Body portion 10 is preferably provided with a recess 28 which extends peripherally thereabout, the lower end of which is disposed below lower reach of contoured faces 23 and 24 and the upper end of which extends across web 13 above the lower reaches of contoured faces 23 and 24
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Screen Walls 
