US125759A - Improvement in center-bits - Google Patents
Improvement in center-bits Download PDFInfo
- Publication number
- US125759A US125759A US125759DA US125759A US 125759 A US125759 A US 125759A US 125759D A US125759D A US 125759DA US 125759 A US125759 A US 125759A
- Authority
- US
- United States
- Prior art keywords
- center
- bit
- hole
- bits
- improvement
- 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
- 210000000088 Lip Anatomy 0.000 description 8
- 241001351439 Oneida Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 210000001699 lower leg Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- 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
- Y10T408/899—Having inversely angled cutting edge
Definitions
- Figure l is a side View of my improved center-bit.
- Fig. 2 is an edge view of the same.
- Fig. 3 represents a hole bored with my improved bit just as the bit leaves it; and Fig. 4 represents the hole ready for the screw.
- My invention has for its object to furnish an improved center-bit which shall be so constructed as to bore the hole and countersink it for the screw-head and plug at one operation, and which shall at the same time be simple in construction, convenient in use, and inexpensive in manufacture, and which may be used for many different-sized screws; and it consists in the combination of a countersink lip or wing with the center-bit, as hereinafter more fully described.
- A is the center-bit, the shank of which is attached toa bit stock or holder in the ordinary manner.
- a is the point or cutter that cuts around the circumference of the hole.
- a is the lip which cuts out the chips or shavings; and
- a is'the centerpoint.
- Upon the side of the point a is formed an inclined or semi-conical lip, a, which forms the conical countersink for the head of the screw.
- the hole is left, as shown in Fig. 3, and the central hole has only to be enlarged according to the size of the body of the screw, as shown in Fig. 4.
- the hole thus formed allows the plug to rest upon the bottom or shoulder of the first or plug countersink, which gives the glue a much better hold than when the hole is bored with an ordinary bit.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Toys (AREA)
Description
UNITED STATES WHILIAM H. RICHARDS, OF DEERFIELD CORNERS, NEW YORK.
IMPROVEMENT IN CENTER-BITS.
Specification forming part of Letters Patent No. 125,759, dated April 16, 1872.
the county of Oneida and State of New York.
Figure l is a side View of my improved center-bit. Fig. 2 is an edge view of the same.
Fig. 3 represents a hole bored with my improved bit just as the bit leaves it; and Fig. 4 represents the hole ready for the screw.
Similar letters of reference indicate corre sponding parts.
My invention has for its object to furnish an improved center-bit which shall be so constructed as to bore the hole and countersink it for the screw-head and plug at one operation, and which shall at the same time be simple in construction, convenient in use, and inexpensive in manufacture, and which may be used for many different-sized screws; and it consists in the combination of a countersink lip or wing with the center-bit, as hereinafter more fully described.
A is the center-bit, the shank of which is attached toa bit stock or holder in the ordinary manner. a is the point or cutter that cuts around the circumference of the hole. a is the lip which cuts out the chips or shavings; and a is'the centerpoint. Upon the side of the point a is formed an inclined or semi-conical lip, a, which forms the conical countersink for the head of the screw. With this bit the hole is left, as shown in Fig. 3, and the central hole has only to be enlarged according to the size of the body of the screw, as shown in Fig. 4. The hole thus formed allows the plug to rest upon the bottom or shoulder of the first or plug countersink, which gives the glue a much better hold than when the hole is bored with an ordinary bit.
Having thus described my invention, I claim as new and desire to secure by Letters Patexit- The inclined or semi-conical lip or countersink a, formed upon the central point a of a center-bit, substantially as herein shown and described, and for the purpose set forth.
WILLIAM H. RICHARDS.
Witnesses:
WILLIAM T. WILLIAMS, DAVID H. WILLIAMS.
Publications (1)
Publication Number | Publication Date |
---|---|
US125759A true US125759A (en) | 1872-04-16 |
Family
ID=2195187
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US125759D Expired - Lifetime US125759A (en) | Improvement in center-bits |
Country Status (1)
Country | Link |
---|---|
US (1) | US125759A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2689131A (en) * | 1952-03-28 | 1954-09-14 | Parker Mfg Company | Tool with shank and removable blade |
US5980169A (en) * | 1997-10-16 | 1999-11-09 | Fisch Precision Tool Co., Inc. | Brad point drill bit |
US20050053439A1 (en) * | 2003-09-09 | 2005-03-10 | Yuhong Wang | Two-flute twist drill |
-
0
- US US125759D patent/US125759A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2689131A (en) * | 1952-03-28 | 1954-09-14 | Parker Mfg Company | Tool with shank and removable blade |
US5980169A (en) * | 1997-10-16 | 1999-11-09 | Fisch Precision Tool Co., Inc. | Brad point drill bit |
US20050053439A1 (en) * | 2003-09-09 | 2005-03-10 | Yuhong Wang | Two-flute twist drill |
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