US1056670A - Expansion-bit. - Google Patents

Expansion-bit. Download PDF

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Publication number
US1056670A
US1056670A US69940812A US1912699408A US1056670A US 1056670 A US1056670 A US 1056670A US 69940812 A US69940812 A US 69940812A US 1912699408 A US1912699408 A US 1912699408A US 1056670 A US1056670 A US 1056670A
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US
United States
Prior art keywords
blade
cutting
clamp plate
recess
edge
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
Application number
US69940812A
Inventor
Louis S Hayden
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CONNECTICUT VALLEY MANUFACTURING Co
Original Assignee
CONNECTICUT VALLEY Manufacturing Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CONNECTICUT VALLEY Manufacturing Co filed Critical CONNECTICUT VALLEY Manufacturing Co
Priority to US69940812A priority Critical patent/US1056670A/en
Application granted granted Critical
Publication of US1056670A publication Critical patent/US1056670A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G15/00—Boring or turning tools; Augers
    • 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
    • Y10T408/86—Tool-support with means to permit positioning of the Tool relative to support
    • Y10T408/87—Tool having stepped cutting edges
    • Y10T408/8738—Tool having stepped cutting edges including inverse cutting edge
    • 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
    • Y10T408/86—Tool-support with means to permit positioning of the Tool relative to support
    • Y10T408/875—Tool-support with means to permit positioning of the Tool relative to support including means to "form" depression in work
    • 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
    • Y10T408/90—Having inversely angled cutting edge and axially extending peripheral cutting spur
    • 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
    • Y10T408/901—Having axially extending peripheral cutting spur

Definitions

  • This invention relates to those wood boring tools which are provided with a cutting blade that can be adjusted more or less to one side of the center for the purpose of enabling the bit to be used for boring holes of different sizes.
  • the object of the invention is to provide a simple and cheap bit of this character which is strong and durable, and which is so constructed that the cutting blade may be easily and quickly adjusted to the necessary degree to bore the required hole and can be securely clamped in the position to which it is set by means of the adjusting part.
  • This object is attained by locating the adjusting screw in the clamp plate and causing it to engage teeth in theedge of the cutting blade in such manner that when the clamp plate is tightened the adjusting screw which engages the teeth binds the blade in position.
  • Figure 1 of the accompanying drawings is a view looking at one side of a bit which embodies this invention.
  • Fig. 2 is a view looking at the front.
  • Fig. 3 is a view look ing at the other side.
  • Fig. 4 is a view looking at the bottom.
  • Fig. 5 is a transverse section taken on the plane indicated by the dotted line 55 on Fig. 1.
  • Fig. 6 is a perspective view of the clamp plate
  • Fig. 7 shows plan, bottom and end views of the cutting blade and illustrate the feature of its construction whereby the angle of the cutting lip is the same from one end of the blade to the other.
  • the head 1 at the end of the shank 2 is cut away on one side so as to provide the necessary recess for the clamp plate and cutting blade.
  • the head At the end of the head is the usual throat 3 and throat lip 4C for deflecting chips over the cutter blade, the head spur 5 and the centering or lead screw 6.
  • the lower end of the recess is provided with the undercut shoulder 7 which dovetails into the angular recess in the bottom edge near the back of the cutting blade 8 for the purpose of holding that edge of the cutting blade in place.
  • the cut-ting blade is inclined and provided with rack teeth 9.
  • the blade spur 10 On the outer end and projecting downwardly from 'the cutting blade is the blade spur 10.
  • a novel feature of the cutting blade is that the cutting lip 11, which is curved from the wide end 12 to the narrow end 13, so that it will not, however adjusted, interfere with the passage of chips up through the clearing throat, is tapered on the same angle from end to end in order that the same cutting efl'ect may be obtained for its entire length, and the same cutting angle always be insured wherever the blade is adjusted.
  • the lip when it is formed is milled off on the upper side so that the line 14 is on a curve, which, of course, is farther back from the cutting edge of the lip at the highest part of the cutting lip than it is at the lowest part of the cutting lip, as shown clearly in Fig. 7.
  • This may be accomplished by either causing the bit blade to travel on a curve below the milling cutter by which it is shaped, or by causing the milling cutter to travel on a curve over the bit blade. By milling the blade on a curve in this manner, the angle of the cutting lip always remains the same, and yet the cutting edge of the lip will be on a curve.
  • the clamp plate 15 has a recess along its lower edge so as to provide a transverse groove for the adjusting .screw 16.
  • the clamp plate is also provided with a hole 17 for the clamp screw 18.
  • the cutting blade is very securely held in place by the adjusting screw when the clamp plate is tightened.
  • the adjusting screw bears on the edge of the clamp plate for practically its whole length, and. as the screw threads and rack teeth are cut the same, thethreads engage on their edges and at the bottoms so that there is a large surface and no liability of breaking or amming the threads. hen the clamp plate is taken off, the adjusting screw remains in its groove and thus there is no danger of its dropping out and becoming lost.
  • An expansion bit having a head with a recess, a cutting blade movable transversely of the head in said recess, said blade having a rack at one edge, a clamp plate, an adjusting screw carried by the clamp plate and adapted to engage the rack at the edge of the blade, and means for securing the clamp plate in position.
  • An expansion bit having a head with a recess, a blade movable transversely of the head in said recess, said blade having an inclined upper edge that is provided with rack teeth, a clamp plate held in said recess in the head, an adjusting screw carried by the clamp plate and adapted to bear on the toothed inclined edge of the blade, and means for tightening the clamp plate and causing the adjusting screw to bind the blade in position.
  • An expansion bit having a head with a recess, a blade movable transversely of the head in said recess, said blade having its lower edge inclined and engaging an inclined wall of the recess and having its upper edge inclined and provided with rack teeth, a clamp plate with its upper edge engaging the wall at the upper end of the recess in the head and having a transverse recess in its lower edge, an adjusting screw held in said recess and adapted to engage the inclined rack at the upper edge of the blade, and a screw for tightening the clamp plate and causing the adjusting screw to bind the blade in position.
  • An expansion bit having a head with a recess on one side, a lead screw projecting from one end and a throat extending from the end adjacent to the lead screw to the recess, a blade movable transversely in the head with its lower edge engaged with the wall at the lower end of the recess in the head, said blade having a cutting lip that is wider at one end than the other and has a curved cutting edge that is of uniform angle from one end to the other, a clamp plate, an adjusting screw engaging the cutting blade, and means for tightening the clamp plate and causing the blade to be secured in position.
  • a cutting blade for an expansion bit having a cutting lip that is wider at one end than the other, has a curved cutting edge, and increases in thickness on a curve from the narrow end to the wide end whereby the cutting edge of the lip will be curved and the angle of taper of the lip will be the same from one end to the other.
  • a cutting blade for an expansion bit having a cutting lip that is wider at one end than the other and has a curved cutting edge that is of uniform angle from one end to the other.
  • Coples of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). C.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Description

L, s'. HAYDEN. EXPANSION BIT. APPLIOATION ITILBD MAY 24, 1912.
1,056,670 Patented Mar.1 8,1913.
Ti J Z 774,
COLUMBIA PLANOGRAPH 70.. WASHINGTON, u, c.
UNITED STATES PATENT OFFICE.
LOUIS S. HAYDEN, 0F ESSEX, CONNECTICUT, ASSIGNOR TO THE CONNECTICUT VALLEY CONNECTICUT, A CORPORATION OF CON- MANUFACTURING COMPANY, OF ESSEX,
NECTICUT.
EXPANSION BIT.
To all whom it may concern:
Be it known that I, LOUIS S. HAYDEN, a citizen of the United States, residing at Essex, in the county of Middlesex and State of Connecticut, have invented anew and useful Improvement in Expansion-Bits, of which the following is a specification.
This invention relates to those wood boring tools which are provided with a cutting blade that can be adjusted more or less to one side of the center for the purpose of enabling the bit to be used for boring holes of different sizes.
The object of the invention is to provide a simple and cheap bit of this character which is strong and durable, and which is so constructed that the cutting blade may be easily and quickly adjusted to the necessary degree to bore the required hole and can be securely clamped in the position to which it is set by means of the adjusting part. This object is attained by locating the adjusting screw in the clamp plate and causing it to engage teeth in theedge of the cutting blade in such manner that when the clamp plate is tightened the adjusting screw which engages the teeth binds the blade in position.
Figure 1 of the accompanying drawings is a view looking at one side of a bit which embodies this invention. Fig. 2 is a view looking at the front. Fig. 3 is a view look ing at the other side. Fig. 4 is a view looking at the bottom. Fig. 5 is a transverse section taken on the plane indicated by the dotted line 55 on Fig. 1. Fig. 6 is a perspective view of the clamp plate, and Fig. 7 shows plan, bottom and end views of the cutting blade and illustrate the feature of its construction whereby the angle of the cutting lip is the same from one end of the blade to the other.
The head 1 at the end of the shank 2 is cut away on one side so as to provide the necessary recess for the clamp plate and cutting blade. At the end of the head is the usual throat 3 and throat lip 4C for deflecting chips over the cutter blade, the head spur 5 and the centering or lead screw 6. The lower end of the recess is provided with the undercut shoulder 7 which dovetails into the angular recess in the bottom edge near the back of the cutting blade 8 for the purpose of holding that edge of the cutting blade in place. The upper edge of Specification of Letters Patent.
Application filed May 24, 1912.
to hold the upper Patented Mar. 18,1913. Serial NO. 699,408.
the cut-ting blade is inclined and provided with rack teeth 9. On the outer end and projecting downwardly from 'the cutting blade is the blade spur 10.
A novel feature of the cutting blade is that the cutting lip 11, which is curved from the wide end 12 to the narrow end 13, so that it will not, however adjusted, interfere with the passage of chips up through the clearing throat, is tapered on the same angle from end to end in order that the same cutting efl'ect may be obtained for its entire length, and the same cutting angle always be insured wherever the blade is adjusted. To accomplish this, that is, to have the cutting edge of the cutting lip on a curve and to have the angle of the cutting lip always the same, the lip when it is formed is milled off on the upper side so that the line 14 is on a curve, which, of course, is farther back from the cutting edge of the lip at the highest part of the cutting lip than it is at the lowest part of the cutting lip, as shown clearly in Fig. 7. This may be accomplished by either causing the bit blade to travel on a curve below the milling cutter by which it is shaped, or by causing the milling cutter to travel on a curve over the bit blade. By milling the blade on a curve in this manner, the angle of the cutting lip always remains the same, and yet the cutting edge of the lip will be on a curve. The clamp plate 15 has a recess along its lower edge so as to provide a transverse groove for the adjusting .screw 16. The clamp plate is also provided with a hole 17 for the clamp screw 18. When the clamp screw is turned in, the upper edge of the clamp plate abuts against the upper edge of the recess in the head, and the threads on the adjusting screw enter the threads of the rack on the edge of the cutting blade and are pressed down thereon in such manner as edge of the cutting blade in position and at the same time force it down so that the dove-tail holds the lower edge of the blade. When the clamp screw is loosened, the cutting blade may be adjusted by turning the adjusting screw which is held in the clamp plate in any desired manner.
With this construction the cutting blade is very securely held in place by the adjusting screw when the clamp plate is tightened. The adjusting screw bears on the edge of the clamp plate for practically its whole length, and. as the screw threads and rack teeth are cut the same, thethreads engage on their edges and at the bottoms so that there is a large surface and no liability of breaking or amming the threads. hen the clamp plate is taken off, the adjusting screw remains in its groove and thus there is no danger of its dropping out and becoming lost.
The invention claimed is:
1. An expansion bit having a head with a recess, a cutting blade movable transversely of the head in said recess, said blade having a rack at one edge, a clamp plate, an adjusting screw carried by the clamp plate and adapted to engage the rack at the edge of the blade, and means for securing the clamp plate in position.
2. An expansion bit having a head with a recess, a blade movable transversely of the head in said recess, said blade having an inclined upper edge that is provided with rack teeth, a clamp plate held in said recess in the head, an adjusting screw carried by the clamp plate and adapted to bear on the toothed inclined edge of the blade, and means for tightening the clamp plate and causing the adjusting screw to bind the blade in position.
3. An expansion bit having a head with a recess, a blade movable transversely of the head in said recess, said blade having its lower edge inclined and engaging an inclined wall of the recess and having its upper edge inclined and provided with rack teeth, a clamp plate with its upper edge engaging the wall at the upper end of the recess in the head and having a transverse recess in its lower edge, an adjusting screw held in said recess and adapted to engage the inclined rack at the upper edge of the blade, and a screw for tightening the clamp plate and causing the adjusting screw to bind the blade in position.
4. An expansion bit having a head with a recess on one side, a lead screw projecting from one end and a throat extending from the end adjacent to the lead screw to the recess, a blade movable transversely in the head with its lower edge engaged with the wall at the lower end of the recess in the head, said blade having a cutting lip that is wider at one end than the other and has a curved cutting edge that is of uniform angle from one end to the other, a clamp plate, an adjusting screw engaging the cutting blade, and means for tightening the clamp plate and causing the blade to be secured in position.
5. A cutting blade for an expansion bit having a cutting lip that is wider at one end than the other, has a curved cutting edge, and increases in thickness on a curve from the narrow end to the wide end whereby the cutting edge of the lip will be curved and the angle of taper of the lip will be the same from one end to the other.
6. A cutting blade for an expansion bit having a cutting lip that is wider at one end than the other and has a curved cutting edge that is of uniform angle from one end to the other.
LOUIS S. HAYDEN. \Vitnesses WALTER H. Vmcrrr, GURnoN L. TUCKER.
Coples of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). C.
US69940812A 1912-05-24 1912-05-24 Expansion-bit. Expired - Lifetime US1056670A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577986A (en) * 1946-06-18 1951-12-11 Robert H Clark Expansion bit
US20040052594A1 (en) * 2002-04-30 2004-03-18 Iqbal Singh Spade-type drill bit having helical configuration
US20080279647A1 (en) * 2005-10-20 2008-11-13 Irwin Industrial Tool Company Spade bit

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577986A (en) * 1946-06-18 1951-12-11 Robert H Clark Expansion bit
US20040052594A1 (en) * 2002-04-30 2004-03-18 Iqbal Singh Spade-type drill bit having helical configuration
US7140814B2 (en) 2002-04-30 2006-11-28 Irwin Industrial Tool Company Spade-type drill bit having helical configuration
US20080279647A1 (en) * 2005-10-20 2008-11-13 Irwin Industrial Tool Company Spade bit
US7473056B2 (en) 2005-10-20 2009-01-06 Irwin Industrial Tool Company Spade bit
US20100104387A1 (en) * 2005-10-20 2010-04-29 Irwin Industrial Tool Company Spade bit
US7905690B2 (en) 2005-10-20 2011-03-15 Irwin Industrial Tool Company Spade bit
US7922429B2 (en) 2005-10-20 2011-04-12 Irwin Industrial Tool Company Spade bit
US20110150588A1 (en) * 2005-10-20 2011-06-23 Irwin Industrial Tool Company Spade bit
US8147174B2 (en) 2005-10-20 2012-04-03 Irwin Industrial Tool Company Spade bit

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