US1737495A - Stone drill - Google Patents

Stone drill Download PDF

Info

Publication number
US1737495A
US1737495A US4337A US433725A US1737495A US 1737495 A US1737495 A US 1737495A US 4337 A US4337 A US 4337A US 433725 A US433725 A US 433725A US 1737495 A US1737495 A US 1737495A
Authority
US
United States
Prior art keywords
drill
cutting edge
sides
leading
body portion
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
US4337A
Inventor
Feldmar Adalbert Bela
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US4337A priority Critical patent/US1737495A/en
Application granted granted Critical
Publication of US1737495A publication Critical patent/US1737495A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Definitions

  • the present invention relates to a drill for producing holes in ⁇ stone and stone-like v materials of all kinds, saidy drill being'of the type which require to be manipulated by a series of blows.
  • the drill is driven into the stone or similar material by means of a hammer, at the saine time being rotated by hand or by means of a suitable holder.
  • the object of the present invention is to overcome this said defect.
  • the cutting edge of the drill is curved outwardly at the leading sides, i. e., at the rear part of each leading side proceeding along the edge of the grooves in lthe shaft.
  • This outward curve of the cutting edge results in the drill after having been driven in to a certain extent automatically releasing itself, becoming loose, and therefore easily capable of being rotated.
  • the effect of this embodiment of the leading sides is still further increased if the trailing sides are ground slightly concave. ⁇
  • Fig. 'l is a front elevational view of the drill.
  • Fig. 2 is an enlarged detail showing the cutting edge.
  • Fig. 3 is a top plan view of the drill.
  • Figs. 4, 5 and 6 are sections on lines IV-IV, V-V, VI-VI.
  • the invention is described in connection with a drill 1 having a. holder 2, a chisel-like, curved cutting edge 3, and two grooves 4 in the shaft.
  • the chisel-like cutting edge A3 possesses two alternately disposed leading sides 5 and two trailing sides 6.
  • the invention consists in providing the leading sides at the rear part with an outwardly curved elevation 8 running along the edge 7 of the grooves 4:
  • This outwardly curved elevation 8 extends gradually from the outside beyond the centre of the cutting edge '3. If the drill is driven in by means of a hammer the cutting edge 3 at first acts in the usual manner. When, however, the outwardly. curved elevation 8 of the cutting edge comes into contact with the stone or wall, this causes the drill to recoil, the later thus automatically being released or loosened, so that same may be rotated without diiculty, the leading sides 5 operating in the usual, 60 manner.
  • a stone drill comprising a cylindrical, 7o body portion, a curved chisel-like cutting edge at one end of the body portion with leading and trailing sides, oppositely disposed rooves in the body portion, ⁇ the leading sidges to the cutting edge being bordered adjacent the grooves with a convex por ⁇ tion, -making a slightly greater angle with respect to the axis of said body portion, than the respective sides of said cutting edge, there being no plane with respect to which the ao leading and trailing sides are symmetrical.
  • stone drill comprising a cylindrical body portion, a curved chisel-like cutting edge at one end of the body portion, oppositely disposed grooves in the body portion, convex leading sides to the cutting edge and concave traillng sides to the cutting edge, the leading and trailing sides being unsymmetrical relative to planes including the longitudinal axis of the body portion.
  • a stone drill comprising a cylindrical body portion, a curved chisel-like cutting edge at one end of the body portion with vleading and trailing sides, oppositelydisposed grooves in the body portion, the leading sides to the cutting edge being bordered adjacent the grooves with a convex portion making a slightly greater angle with respect to the axis of said body portion than the respective sides of said cuttingV edge, there y being no plane with respect to which the leading and trailing sides are symmetrical, the trailing sides being concave.

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

Patented Nov. 26, 1929 UNITED STATESl PATENT OFFICE STONE DRILL Application filed January 23, 1925. Serial No. 4,337.
The present invention relates to a drill for producing holes in` stone and stone-like v materials of all kinds, saidy drill being'of the type which require to be manipulated by a series of blows. The drill is driven into the stone or similar material by means of a hammer, at the saine time being rotated by hand or by means of a suitable holder.
Some of the stone drills of this type hitherto known possess the disadvantage that when being used they are liable to become wedged in the boring being produced, and can then only be rotated with diHculty. The object of the present invention is to overcome this said defect.
According to the invention the cutting edge of the drill is curved outwardly at the leading sides, i. e., at the rear part of each leading side proceeding along the edge of the grooves in lthe shaft. This outward curve of the cutting edge results in the drill after having been driven in to a certain extent automatically releasing itself, becoming loose, and therefore easily capable of being rotated. The effect of this embodiment of the leading sides is still further increased if the trailing sides are ground slightly concave.`
A form of embodiment of the invention'is 3o described by way of example in the following, reference being made to the accompanying drawing.
Fig. 'l is a front elevational view of the drill.
Fig. 2 is an enlarged detail showing the cutting edge.
Fig. 3 is a top plan view of the drill.
Figs. 4, 5 and 6 are sections on lines IV-IV, V-V, VI-VI.
40 The invention is described in connection with a drill 1 having a. holder 2, a chisel-like, curved cutting edge 3, and two grooves 4 in the shaft. The chisel-like cutting edge A3 possesses two alternately disposed leading sides 5 and two trailing sides 6. f
The invention consists in providing the leading sides at the rear part with an outwardly curved elevation 8 running along the edge 7 of the grooves 4: This outwardly curved elevation 8 extends gradually from the outside beyond the centre of the cutting edge '3. If the drill is driven in by means of a hammer the cutting edge 3 at first acts in the usual manner. When, however, the outwardly. curved elevation 8 of the cutting edge comes into contact with the stone or wall, this causes the drill to recoil, the later thus automatically being released or loosened, so that same may be rotated without diiculty, the leading sides 5 operating in the usual, 60 manner.
The eect of .this embodiment of the leading parts 5, 8 is further increased if the trailing parts 6 are ground somewhat concave. Such an inward curvature moreover posc5 sesses the advantage that the material removed from the boring is able to pass without hindrance into the grooves 4. l
What I claim is:
1. A stone drill, comprising a cylindrical, 7o body portion, a curved chisel-like cutting edge at one end of the body portion with leading and trailing sides, oppositely disposed rooves in the body portion,`the leading sidges to the cutting edge being bordered adjacent the grooves with a convex por` tion, -making a slightly greater angle with respect to the axis of said body portion, than the respective sides of said cutting edge, there being no plane with respect to which the ao leading and trailing sides are symmetrical.
2. stone drill comprising a cylindrical body portion, a curved chisel-like cutting edge at one end of the body portion, oppositely disposed grooves in the body portion, convex leading sides to the cutting edge and concave traillng sides to the cutting edge, the leading and trailing sides being unsymmetrical relative to planes including the longitudinal axis of the body portion.
3. A stone drill, comprising a cylindrical body portion, a curved chisel-like cutting edge at one end of the body portion with vleading and trailing sides, oppositelydisposed grooves in the body portion, the leading sides to the cutting edge being bordered adjacent the grooves with a convex portion making a slightly greater angle with respect to the axis of said body portion than the respective sides of said cuttingV edge, there y being no plane with respect to which the leading and trailing sides are symmetrical, the trailing sides being concave.
In testimony whereof I have alixed my signature.
ADALBERT BELA FELDMAR.
US4337A 1925-01-23 1925-01-23 Stone drill Expired - Lifetime US1737495A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US4337A US1737495A (en) 1925-01-23 1925-01-23 Stone drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4337A US1737495A (en) 1925-01-23 1925-01-23 Stone drill

Publications (1)

Publication Number Publication Date
US1737495A true US1737495A (en) 1929-11-26

Family

ID=21710268

Family Applications (1)

Application Number Title Priority Date Filing Date
US4337A Expired - Lifetime US1737495A (en) 1925-01-23 1925-01-23 Stone drill

Country Status (1)

Country Link
US (1) US1737495A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4342368A (en) * 1977-08-18 1982-08-03 Kennametal Inc. Rotary drills and drill bits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4342368A (en) * 1977-08-18 1982-08-03 Kennametal Inc. Rotary drills and drill bits

Similar Documents

Publication Publication Date Title
US3027953A (en) Percussion tool with replaceable point
US4026372A (en) Drill bits
EP0941793A2 (en) Drilling tool
US2104823A (en) Cutter flushing device
US1737495A (en) Stone drill
US1885085A (en) Rock drill
US1169369A (en) Drill.
US808245A (en) Wood-boring implement.
US1899771A (en) Blade type bit
US3116654A (en) Drill
US1504852A (en) Rotary drill bit
US2036817A (en) Drill bit
US3269471A (en) Rock drilling bit
US2088197A (en) Brick and stone drill
US2602639A (en) Rock drill bit
US2484365A (en) Rock drill bit
US1913550A (en) Drill bit
US1551717A (en) Drill bit
US895387A (en) Channeling-tool.
DE848938C (en) Rotary drill with carbide tipped
US1950513A (en) Bit for drills
US2614811A (en) Drill
DE2522300A1 (en) Rotary or impact type stone drill - has cutting head with central and peripheral hard metal cutting inserts
US1511466A (en) Drill
US2633335A (en) Rock drilling tool