US407868A - Boring-bit - Google Patents
Boring-bit Download PDFInfo
- Publication number
- US407868A US407868A US407868DA US407868A US 407868 A US407868 A US 407868A US 407868D A US407868D A US 407868DA US 407868 A US407868 A US 407868A
- Authority
- US
- United States
- Prior art keywords
- bit
- boring
- groove
- point
- shank
- 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
- 210000001699 lower leg Anatomy 0.000 description 12
- 230000037250 Clearance Effects 0.000 description 6
- 230000035512 clearance Effects 0.000 description 6
- 239000002023 wood Substances 0.000 description 6
- 210000003414 Extremities Anatomy 0.000 description 4
- 239000011121 hardwood Substances 0.000 description 4
- 241000271935 Bitis Species 0.000 description 2
- 210000001364 Upper Extremity Anatomy 0.000 description 2
- 241001516311 Watermelon virus A Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G5/00—Thread-cutting tools; Die-heads
- B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
- B23G5/04—Dies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/904—Tool or Tool with support with pitch-stabilizing ridge
Definitions
- the invention relates to improvements in boring-bits such as are used witha brace, being particularly adapted to bore into hard wood; and it consists in the construction and novel combination of parts hereinafter described, illustrated in the drawings, and pointed out in the appended claim.
- Figure l is a perspective Fig. 2 is a face view thereof.
- Fig, 3 is a back or outside view of the said bit.
- A designates the bit, which is a spoon or pod bit, having one Side a longitudinally concave, as shown.
- the shallow parallel inclined grooves B which, if the bit were cylindrical and the said grooves were continuous thereon,would form screw-threads on the shank of the bit.
- the said grooves when the bit is in use, draw the latter int-o the wood, similarly to the threads of a screw, and also give clearance by conveying the wooddust into the eoncavity a, whence it passes to the outside of the piece being bored.
- the shank or upper end O of the bit is squared for insertion into an ordinary brace.
- the clearingV or cutting groove or cavity is usually made spirally; but I prefer to form it straight, with the screw-threads on the opposite side of t-he bit extending to the upper extremity of the groove or cavity.
- the point of the bit has no power of driving the tool in, nor does it produce dust or cuttings, except at its edges, the groove being intended more particularly for easy clearance than for cutting the wood.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
- Earth Drilling (AREA)
Description
`(No Model.) J. C. MIDDLETON.
BORING BIT.
180.407,868. Patented July 30,1889.
n. PETERS. Pmwumgqpper, wnhingnm D. c.
WMA/weee@ vview of a bit embodying the invention.
UNITED STATES PATENT OEEICE.
JOSEPH O. MIDDLETON, OF NORRISTOVN, PENNSYLVANIA.
BORING-BIT.
SPECIFICATION forming part of Letters Patent No. 407,868, dated July 30, 1889 Application filed May 29, 1888. Serial No. 275,444. (No model.)
To all whom t may concern:
Be it known that I, JOSEPH C. MIDDLETON, a citizen of the United States, residing at Norristown, in the county of Montgomery and State of Pennsylvania, have invented new and useful Improvements in Boring-Bits, of which the following is a specification.
The invention relates to improvements in boring-bits such as are used witha brace, being particularly adapted to bore into hard wood; and it consists in the construction and novel combination of parts hereinafter described, illustrated in the drawings, and pointed out in the appended claim.
In the drawings, Figure l is a perspective Fig. 2 is a face view thereof. Fig, 3 is a back or outside view of the said bit.
Referring to the drawings, A designates the bit, which is a spoon or pod bit, having one Side a longitudinally concave, as shown. On the outer or rear side of the bit are the shallow parallel inclined grooves B,'which, if the bit were cylindrical and the said grooves were continuous thereon,would form screw-threads on the shank of the bit. The said grooves, when the bit is in use, draw the latter int-o the wood, similarly to the threads of a screw, and also give clearance by conveying the wooddust into the eoncavity a, whence it passes to the outside of the piece being bored.
The shank or upper end O of the bit is squared for insertion into an ordinary brace.
Boring-bits of this kind .are usually made with screw-threaded points at their lower ends to engage the wood and draw the bit therein; but the point of any bitis liable to break oft' in use, and when a screw-threaded point breaks the bit is useless. Therefore, I have formed the pointD of thisimproved bit smooth by simply tapering the extremity of the lat-ter; and therefore, if by accident it is broken off or injured, it may be repaired or renewed by resharpening the end of the bit.; also, a point which is not provided with the screwthread is less liable to be broken.
In the present prac-tice the clearingV or cutting groove or cavity is usually made spirally; but I prefer to form it straight, with the screw-threads on the opposite side of t-he bit extending to the upper extremity of the groove or cavity.
I am aware of the pat-ent, No. 17 2,377, granted to B. F. Bee JanuarylS, 1876; but it will be observed that in this bit the point is screwthreaded, whereas in my improved bit the point is smooth, as described.
On account of the clearance furnished by the concavity a and by the groove B, hard wood can be bored very easily with this bit.
It must be observed that the threaded portion of the shank is of equal diameter throughout, that the smooth tapered point D is below said threaded portion, and that the clearance-groove extends to the end of said point.
The point of the bit has no power of driving the tool in, nor does it produce dust or cuttings, except at its edges, the groove being intended more particularly for easy clearance than for cutting the wood.
The cuttings from all portions of the threads empty themselves immediately into the groove at the end of each thread, thus making the work much more easy.
Having described my invention, I claim- The herein-described bit, consisting of the straight semi-cylindrical shank A, provided with a clearance-groove a, extending from near the butt of the shank to its extremity, the edges of the groove being parallel for a portion ot their lengths and converged to forni an entering-point D, and semispiral threads B, formed in the convex surface of the shank and extending from near the upper end of the groove to near the tip and from edge to edge of the groove, substantially as specified.
In testimony that I claim the foregoing as my own I have' hereto aflixed niy signature in presence of two witnesses.
JOSEPH C. MIDDLETON. Witnesses:
HAROLD CoRsoN, E. B. HELEFENsfrEIN.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US407868A true US407868A (en) | 1889-07-30 |
Family
ID=2476809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US407868D Expired - Lifetime US407868A (en) | Boring-bit |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US407868A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2623552A (en) * | 1949-12-30 | 1952-12-30 | Sherman W Compton | Side cutting rotary tool |
-
0
- US US407868D patent/US407868A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2623552A (en) * | 1949-12-30 | 1952-12-30 | Sherman W Compton | Side cutting rotary tool |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US750537A (en) | Drilling-tool | |
| US928997A (en) | Lock-screw. | |
| US385088A (en) | Drilling-tool | |
| US407868A (en) | Boring-bit | |
| US472541A (en) | Borinq-tool | |
| US386263A (en) | Tool-holder and tools for the same | |
| US412952A (en) | Charles elterich | |
| US378614A (en) | Levi h | |
| US496253A (en) | Boring-tool | |
| US429851A (en) | Screw | |
| US1027039A (en) | Drill. | |
| US659125A (en) | Combination reamer, tap, and countersink. | |
| US305625A (en) | Thomas newey | |
| US451896A (en) | Joseph e | |
| US1145822A (en) | Core-drill. | |
| US863183A (en) | Screw. | |
| US202061A (en) | Improvement in augers | |
| US1162163A (en) | Boring-tool. | |
| US1018096A (en) | Drilling apparatus. | |
| US421293A (en) | Wood-auger | |
| US963468A (en) | Expansible bit. | |
| US283705A (en) | Hffiam e | |
| US1260068A (en) | Auger. | |
| US427460A (en) | Tool-handle | |
| US779084A (en) | Drill or tool holder. |