US1007037A - Drill. - Google Patents
Drill. Download PDFInfo
- Publication number
- US1007037A US1007037A US61073011A US1911610730A US1007037A US 1007037 A US1007037 A US 1007037A US 61073011 A US61073011 A US 61073011A US 1911610730 A US1911610730 A US 1911610730A US 1007037 A US1007037 A US 1007037A
- Authority
- US
- United States
- Prior art keywords
- tool
- shoulder
- concrete
- cutting edge
- lead
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 235000017274 Diospyros sandwicensis Nutrition 0.000 description 1
- 241000282838 Lama Species 0.000 description 1
- 238000006968 MacDonald synthesis reaction Methods 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/36—Percussion drill bits
- E21B10/40—Percussion drill bits with leading portion
Definitions
- This invention relates to improvements in rock drills and more particularly to a drill especially adapt-ed for forming holes in concrete or cement structures.
- the object of the invention is to provide a simple and cheap device which may be quickly and easily sharpened or repaired and which is so formed as to provide the several advantages of the construction, all as hereinafter more fully described reference being had to the accompanying drawing, in which Figure 1 is a side elevation of a tool embodying the invention; Fig. 2, an edge view of the same; and Fig. 3 an end elevation.
- the body or shank 1 of the tool is flattened at each side toward its cutting end or tapered into a narrow projecting end portion or lead point 2 which is formed with a beveled end forming an extreme cutting edge 3.
- Extending lat-- erally from each side of the lead 2 is a shoulder 1, said shoulders extending to the full width of the tool and determining the size of the hole cut in the concrete.
- These shoulders are each formed with an inclined surface 5 which surface meets one side surface of the shank at an acute angle to form a sharp cutting edge 6.
- the surface 5 of the shoulder at one side of the tool is formed at an angle to the longitudinal axis of the shank and the surface of the shoulder at the other side is oppositely inclined so that the cutting edge 6 of one shoulder is formed by the meeting of the inclined surface 5 of the shoulder with one side surface of the tapering end of the tool, and the cutting edge 6 of the other shoulder is formed by the meeting of the inclined surface of that shoulder with the opposite side surface of the tapered end of the shank.
- the narrow extended portion 2 forms a lead point for the tool to guide the same so that a straight hole will be formed, and this point, being formed with a chisel edge 3, will readily cut into the concrete and clear itself.
- the sharp cutting edges 6 of the shoulders extending laterally from the lead point at right angles to the axis of the tool maybe readily ground when they become dulled and rapidly cut and chip off the concrete around the center hole formed by the lead.
- These shoulders being formed with surfaces which are inclined in opposite directions, the tendency of the tool will be to turn when driven into the concrete because of the inclination of these surfaces and to chip off the stone or concrete and clear themselves instead of embedding themselves in it.
- a tool for the purpose described comprising a shank portion formed with a flattened tapering end provided with a projecting center end lead portion having a transverse cutting edge extending in the axial plane of the tool, and a laterally extending shoulder at each side of the lead portion provided with a transverse cutting edge, the cutting edge of one shoulder extending parallel with and at one side of said plane of the tool and the cutting edge of the other shoulder extending parallel with and at the opposite side of said plane of the tool.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Description
A. J. MACDONALD- DRILL.
APPLICATION FILED n13.25, 1911.
1,007,037, Patented Oct. 24, 1911.
wi t lama @M a. 6PM Q% QZWM ALLAN J. MACDONALD, OF PORT HURON, MICHIGAN.
DRILL.
Specification of Letters Patent.
Application filed February 25, 1911. Serial No. 610,730.
Patented Oct. 24, 1911.
To all whom it may concern:
Be it known that I, ALLAN J. MACDON- ALD, a citizen of the United States of America, residing at Port Huron, in the county of St. Clair and State of Michigan, have invented certain new and useful Improvements in Drills, of which the following is a specification, reference being had therein to the accompanying drawings.
This invention relates to improvements in rock drills and more particularly to a drill especially adapt-ed for forming holes in concrete or cement structures.
The object of the invention is to provide a simple and cheap device which may be quickly and easily sharpened or repaired and which is so formed as to provide the several advantages of the construction, all as hereinafter more fully described reference being had to the accompanying drawing, in which Figure 1 is a side elevation of a tool embodying the invention; Fig. 2, an edge view of the same; and Fig. 3 an end elevation.
As shown in the drawing the body or shank 1 of the tool is flattened at each side toward its cutting end or tapered into a narrow projecting end portion or lead point 2 which is formed with a beveled end forming an extreme cutting edge 3. Extending lat-- erally from each side of the lead 2 is a shoulder 1, said shoulders extending to the full width of the tool and determining the size of the hole cut in the concrete. These shoulders are each formed with an inclined surface 5 which surface meets one side surface of the shank at an acute angle to form a sharp cutting edge 6. The surface 5 of the shoulder at one side of the tool is formed at an angle to the longitudinal axis of the shank and the surface of the shoulder at the other side is oppositely inclined so that the cutting edge 6 of one shoulder is formed by the meeting of the inclined surface 5 of the shoulder with one side surface of the tapering end of the tool, and the cutting edge 6 of the other shoulder is formed by the meeting of the inclined surface of that shoulder with the opposite side surface of the tapered end of the shank. The narrow extended portion 2 forms a lead point for the tool to guide the same so that a straight hole will be formed, and this point, being formed with a chisel edge 3, will readily cut into the concrete and clear itself. The sharp cutting edges 6 of the shoulders extending laterally from the lead point at right angles to the axis of the tool, maybe readily ground when they become dulled and rapidly cut and chip off the concrete around the center hole formed by the lead. These shoulders being formed with surfaces which are inclined in opposite directions, the tendency of the tool will be to turn when driven into the concrete because of the inclination of these surfaces and to chip off the stone or concrete and clear themselves instead of embedding themselves in it.
By forming the cutting edges in the manner described with oppositely inclined surfaces at the opposite sides of the tool, the tendency of the tool is to turn as it is driven and thus cut and loosen up the concrete around the center opening formed by the lead. The tool is thus prevented from sticking in the hole formed by it so that it may be readily turned by the operator, in the usual manner of manipulating tools of this class each time it is driven in, and the cutting shoulders will rapidly break away or chip ofi the concrete at each turn.
What I claim is:
A tool for the purpose described comprising a shank portion formed with a flattened tapering end provided with a projecting center end lead portion having a transverse cutting edge extending in the axial plane of the tool, and a laterally extending shoulder at each side of the lead portion provided with a transverse cutting edge, the cutting edge of one shoulder extending parallel with and at one side of said plane of the tool and the cutting edge of the other shoulder extending parallel with and at the opposite side of said plane of the tool.
In testimony whereof I aflix my signature in presence of two witnesses.
ALLAN J. MAOD ONALD.
Witnesses:
Lnwrs E. FLANDnRs, OTTO F. BARTHZEL.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US61073011A US1007037A (en) | 1911-02-25 | 1911-02-25 | Drill. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US61073011A US1007037A (en) | 1911-02-25 | 1911-02-25 | Drill. |
Publications (1)
Publication Number | Publication Date |
---|---|
US1007037A true US1007037A (en) | 1911-10-24 |
Family
ID=3075351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US61073011A Expired - Lifetime US1007037A (en) | 1911-02-25 | 1911-02-25 | Drill. |
Country Status (1)
Country | Link |
---|---|
US (1) | US1007037A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2592440A (en) * | 1946-06-26 | 1952-04-08 | Thompson Products Ltd | Rock drilling tool |
US3674101A (en) * | 1969-04-28 | 1972-07-04 | Hilti Ag | Drill construction |
-
1911
- 1911-02-25 US US61073011A patent/US1007037A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2592440A (en) * | 1946-06-26 | 1952-04-08 | Thompson Products Ltd | Rock drilling tool |
US3674101A (en) * | 1969-04-28 | 1972-07-04 | Hilti Ag | Drill construction |
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