US736998A - Bit. - Google Patents

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Publication number
US736998A
US736998A US13500102A US1902135001A US736998A US 736998 A US736998 A US 736998A US 13500102 A US13500102 A US 13500102A US 1902135001 A US1902135001 A US 1902135001A US 736998 A US736998 A US 736998A
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US
United States
Prior art keywords
blade
bit
stem
cutting
axis
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
US13500102A
Inventor
Walter C Moorhead
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.)
OLIVER O EBERLY
Original Assignee
OLIVER O EBERLY
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 OLIVER O EBERLY filed Critical OLIVER O EBERLY
Priority to US13500102A priority Critical patent/US736998A/en
Application granted granted Critical
Publication of US736998A publication Critical patent/US736998A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material

Definitions

  • This invention relates to bits for miningmachines; and it has for its object to provide a bit which will be less worn in the cutting operation than the ordinary chisel-shaped bit usually employed and in the operation of which bit there will be less energy required.
  • a further object of the invention is to provide a bit which may be easily and quickly dressed.
  • Figure l is a perspective View showing a bit embodying the present invention.
  • Fig. 2 is a side elevation of the bit.
  • a bit comprisin g a transversely-rectangular stem 5, at one. end of which is formed a cutting-point 6, said cutting point or blade being in the form of a rectangular pyramid the axis of which intersects the axis of the stem at an obtuse angle, while the side faces of the blade are at obtuse angles to the corresponding side faces of the stems.
  • the facesof the bit are rounded, as illustrated.
  • the present bit In the use of the present bit it is secured in the mining-machine in the same manner as the usual chisel-shaped bit, and the machine is operated in the usual manner. Owing to the particular shape of the blade of the bit it enters the coal more readily than the chisel-shaped bit, and thus requires less energy to operate it, and it is found in practice that it does not dull so quickly and that it is more easily and quickly dressed, so that its use is more economical.
  • the present bit comprises a cutting edge at each side of the upper face of its blade and at the broadest portion of the blade, so that in drawing the blade upwardly through the coal there is a minimum tendency to wedging of the blade, this arrangement of the two cutting edges being distinguished from .a structure in which a pyramidal blade is disposed with an edge in the middle of the upper side of the blade, so-that the axes of the stem and blade lie in a plane diagonal to the stem and blade, and I claim no part of such arrangement as my invention.
  • a bit for mining-machines consisting of a stem and a blade, the stem being rectangular in cross-section and the blade having the shape of a square pyramid, the axis of which lies at an obtuse angle to the axis of the stem, the axes of the stem and blade lying in a plane which intersects the upper and lower faces of the stem and blade at right angles, and the blade presenting a single cutting edge at each side of its upper face, which cutting edges converge to the point of the blade.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Earth Drilling (AREA)

Description

No. 736,998; PATENTED AUG. 25, 1903.
W. o. MOORHBAD.
BIT.
APPLICATION FILED D110. 12, 1902.
170 MODEL.
5] wuowtoz UNITED STATES Patented August 25, 1903.
PATENT OFFICE.
WALTER O. MOORHEAD, OF SENEOAVILLE, OHIO, ASSIGNOR OF ONE-HALF TO OLIVER O. EBERLY, OF SENEOAVILLE, OHIO.
SPECIFICATION forming part of Letters Patent N 0. 736,998, dated August 25, 1903.
' Application filed December 12,1902. Serial No. 135,001. (No model.)
.To all whom it may concern.-
Be it known that I, WALTER O. MoonHnAD, a citizen of the United States, residing at Senecaville, in the county of Guernsey, State of Ohio, have invented certain new and useful Improvements in Bits; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as Will enable others skilled in the art to which it appertains to make and use the same.
This invention relates to bits for miningmachines; and it has for its object to provide a bit which will be less worn in the cutting operation than the ordinary chisel-shaped bit usually employed and in the operation of which bit there will be less energy required.
A further object of the invention is to provide a bit which may be easily and quickly dressed.
In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in both views, Figure l is a perspective View showing a bit embodying the present invention. Fig. 2 is a side elevation of the bit.
Referring now to the drawings, there is shown a bit comprisin g a transversely-rectangular stem 5, at one. end of which is formed a cutting-point 6, said cutting point or blade being in the form of a rectangular pyramid the axis of which intersects the axis of the stem at an obtuse angle, while the side faces of the blade are at obtuse angles to the corresponding side faces of the stems. At the points of meeting of the sides of the stem and the corresponding side faces of the blade the facesof the bit are rounded, as illustrated.
In the use of the present bit it is secured in the mining-machine in the same manner as the usual chisel-shaped bit, and the machine is operated in the usual manner. Owing to the particular shape of the blade of the bit it enters the coal more readily than the chisel-shaped bit, and thus requires less energy to operate it, and it is found in practice that it does not dull so quickly and that it is more easily and quickly dressed, so that its use is more economical.
The present bit comprises a cutting edge at each side of the upper face of its blade and at the broadest portion of the blade, so that in drawing the blade upwardly through the coal there is a minimum tendency to wedging of the blade, this arrangement of the two cutting edges being distinguished from .a structure in which a pyramidal blade is disposed with an edge in the middle of the upper side of the blade, so-that the axes of the stem and blade lie in a plane diagonal to the stem and blade, and I claim no part of such arrangement as my invention.
What is claimed is- A bit for mining-machines, consisting of a stem and a blade, the stem being rectangular in cross-section and the blade having the shape of a square pyramid, the axis of which lies at an obtuse angle to the axis of the stem, the axes of the stem and blade lying in a plane which intersects the upper and lower faces of the stem and blade at right angles, and the blade presenting a single cutting edge at each side of its upper face, which cutting edges converge to the point of the blade.
In testimony whereof I affix my signature in presence of two witnesses.
WALTER O. MOORHEAD.
Witnesses:
G, D. DUGAN, I. 0. MOILYAR.
US13500102A 1902-12-12 1902-12-12 Bit. Expired - Lifetime US736998A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13500102A US736998A (en) 1902-12-12 1902-12-12 Bit.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13500102A US736998A (en) 1902-12-12 1902-12-12 Bit.

Publications (1)

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US736998A true US736998A (en) 1903-08-25

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US13500102A Expired - Lifetime US736998A (en) 1902-12-12 1902-12-12 Bit.

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