WO1979000771A1 - Scabbler bits - Google Patents

Scabbler bits Download PDF

Info

Publication number
WO1979000771A1
WO1979000771A1 PCT/GB1979/000007 GB7900007W WO7900771A1 WO 1979000771 A1 WO1979000771 A1 WO 1979000771A1 GB 7900007 W GB7900007 W GB 7900007W WO 7900771 A1 WO7900771 A1 WO 7900771A1
Authority
WO
WIPO (PCT)
Prior art keywords
tips
scabbier
pointed
bit
bits
Prior art date
Application number
PCT/GB1979/000007
Other languages
French (fr)
Inventor
J Furby
Original Assignee
Joad Eng Ltd
J Furby
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 Joad Eng Ltd, J Furby filed Critical Joad Eng Ltd
Publication of WO1979000771A1 publication Critical patent/WO1979000771A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
    • B08B1/165—Scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/26—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by impact tools, e.g. by chisels or other tools having a cutting edge
    • B28D1/265—Scabbling machines or scabbling tools

Definitions

  • the invention relates to bits for scabblers, that is percussive machines for roughening, abrading, or removing projections from hard surfaces, for example walls or ground surfaces such as roads or concrete constructions.
  • a scabbier bit comprises a head having a number of tips mounted thereon and means for attachment to a scabbier.
  • the tips may be of hard cutting material such as tungsten carbide and brazed into apertures in the head.
  • a scabbier bit according to the invention has a number of pointed tips separated by chisel shaped cutting tips projecting from the head a smallerdistance than the pointed tips.
  • the pointed tips make indentations in the surface under treatment, and the chisel shaped tips then break the area weakened between indentations, removing a large amount of material per unit of energy of impact.
  • the tips are in straight rows, preferably parallel to each other, preferably wi a pointed tip at the end of each row, and preferably with the pointed tips and chisel shaped tips in adjacent rows off-set with respect to each other. If the scabbier head is circular, the rows can well be along and/or parallel to a diameter of the head.
  • the bit can be mounted on the scabbier so that the rows ar transverse to the direction of advance of the scabbier
  • the means for attachment of the scabbier bit to a scabbier may comprise a shank for reception in a cylinder of the scabbier, or a recess for a piston rod orshank projecting from the cylinder.
  • a taper may be 15 provided between the piston rod end and the bit, the recess possibly comprising a tapered skirt optionally with a cross-hole for securing the rod.
  • Figure 1 is a face view of a bit? and 0 .
  • Figure 2 is a corresponding side elevation with the centre row of pointed tips and chisel-shaped tips in section.
  • the bit shown in the drawings comprises a head 1 of " 5 steel having five parallel transverse slots (shown in
  • the head 1 is provided with an integral shank 4 and a spiral circumferential groove 5 whereby the head 1 can be attached to a scabbier.
  • the shank 4 enters an end of a cylinder (not shown) of a scabbier, a coil spring (not shown) is engaged with one end in the groove 5, and'the other end on the end of the cylinder, to retain the head in position.
  • a piston slidable under motive fluid pressure in the cylinder strikes the free (left hand.) end of the shank 4 and drives the head 1 against the surface under treatment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

A bit (1) for a scabbler comprises pointed tips (2) separated by chisel shaped cutting tips (3) projecting a smaller distance than the pointed tips. The tips are preferably in straight rows ending in pointed tips. The tips may be of tungsten carbide and brazed into position. The pointed tips make indentations into the surface, and the chisel shaped tips then break the intermediate weakened area. The bits are used for abrading hard ground surfaces.

Description

TITLE: Scabbier Bits Description; TECHNICAL" FIELD
The invention relates to bits for scabblers, that is percussive machines for roughening, abrading, or removing projections from hard surfaces, for example walls or ground surfaces such as roads or concrete constructions.
BACKGROUND ART Scabblers are known from Patent Specifications such as U.S. 2,553,435 of Briese, G.B. 709,904 of Metropolitan, and G.B. 1,056,011 of MacDonald, but these give little detail of scabbier bits. However, generally speaking, a scabbier bit comprises a head having a number of tips mounted thereon and means for attachment to a scabbier.
The tips may be of hard cutting material such as tungsten carbide and brazed into apertures in the head.
DISCLOSURE OF INVENTION
A scabbier bit according to the invention has a number of pointed tips separated by chisel shaped cutting tips projecting from the head a smallerdistance than the pointed tips. In use, the pointed tips make indentations in the surface under treatment, and the chisel shaped tips then break the area weakened between indentations, removing a large amount of material per unit of energy of impact. In a preferred arrangement, the tips are in straight rows, preferably parallel to each other, preferably wi a pointed tip at the end of each row, and preferably with the pointed tips and chisel shaped tips in adjacent rows off-set with respect to each other. If the scabbier head is circular,, the rows can well be along and/or parallel to a diameter of the head. The bit can be mounted on the scabbier so that the rows ar transverse to the direction of advance of the scabbier
10 in use.
The means for attachment of the scabbier bit to a scabbier may comprise a shank for reception in a cylinder of the scabbier, or a recess for a piston rod orshank projecting from the cylinder. A taper may be 15 provided between the piston rod end and the bit, the recess possibly comprising a tapered skirt optionally with a cross-hole for securing the rod.
BRIEF DESCRIPTION OF DRAWINGS Figure 1 is a face view of a bit? and 0 . Figure 2 is a corresponding side elevation with the centre row of pointed tips and chisel-shaped tips in section.
BEST MODE OF CARRYING OUT THE INVENTION The bit shown in the drawings comprises a head 1 of " 5 steel having five parallel transverse slots (shown in
OMPI Figure 2 only) each with a number of tungsten carbide pointed tips 2 and tungsten carbide chisel shaped tips 3 brazed therein. The head 1 is provided with an integral shank 4 and a spiral circumferential groove 5 whereby the head 1 can be attached to a scabbier.
INDUSTRIAL- APPLICABILITY
In use, the shank 4, enters an end of a cylinder (not shown) of a scabbier, a coil spring (not shown) is engaged with one end in the groove 5, and'the other end on the end of the cylinder, to retain the head in position. A piston slidable under motive fluid pressure in the cylinder strikes the free (left hand.) end of the shank 4 and drives the head 1 against the surface under treatment.

Claims

• CLAIMS 1. A scabbier bit having a number of tips mounted thereon and means for attachment to a scabbier characterised by a number of pointed tips (2) separat by chisel shaped cutting tips (3) projecting from the head (1) a smaller distance than the pointed tips (2)
2. A scabbier bit according to claim 1 in which -the tips are in straight rows.
3. A scabbier bit according to claim 2 in which the is a pointed tip at the end' of each row.
4. A scabbier bit according to claim 1 with the pointed tips and chisel shaped tips in adjacent rows off-set with respect to each other.
5. A scabbier bit as herein described with referenc to the drawings.
PCT/GB1979/000007 1978-03-16 1979-01-11 Scabbler bits WO1979000771A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB10404/78 1978-03-16
GB1040478 1978-03-16

Publications (1)

Publication Number Publication Date
WO1979000771A1 true WO1979000771A1 (en) 1979-10-04

Family

ID=9967211

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1979/000007 WO1979000771A1 (en) 1978-03-16 1979-01-11 Scabbler bits

Country Status (5)

Country Link
EP (1) EP0018362A1 (en)
JP (1) JPS55500145A (en)
AU (1) AU4480779A (en)
CA (1) CA1097970A (en)
WO (1) WO1979000771A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002704A1 (en) * 1979-06-07 1980-12-11 Joad Eng Ltd Scabblers
US4451093A (en) * 1980-12-10 1984-05-29 Robert Perez Tool for scarifying concrete
WO2001008853A1 (en) * 1999-08-02 2001-02-08 Power & Design Limited An attachment for a percussive tool
CN102275230A (en) * 2010-06-11 2011-12-14 五冶集团上海有限公司 Bushhammer used for chiseling concrete wall

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1626033A (en) * 1924-01-07 1927-04-26 Furst Carl Bush-hammering machine
FR1160274A (en) * 1956-11-14 1958-07-10 Improvement in bush hammering, pitting and material leveling processes
US2924871A (en) * 1956-10-29 1960-02-16 Jack H Brown Impact tool with magnetic base
CH464774A (en) * 1966-04-01 1968-10-31 Atlas Copco Ab Method and device for carving building blocks
FR1598243A (en) * 1967-12-04 1970-07-06

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1626033A (en) * 1924-01-07 1927-04-26 Furst Carl Bush-hammering machine
US2924871A (en) * 1956-10-29 1960-02-16 Jack H Brown Impact tool with magnetic base
FR1160274A (en) * 1956-11-14 1958-07-10 Improvement in bush hammering, pitting and material leveling processes
CH464774A (en) * 1966-04-01 1968-10-31 Atlas Copco Ab Method and device for carving building blocks
FR1598243A (en) * 1967-12-04 1970-07-06

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1980002704A1 (en) * 1979-06-07 1980-12-11 Joad Eng Ltd Scabblers
US4451093A (en) * 1980-12-10 1984-05-29 Robert Perez Tool for scarifying concrete
WO2001008853A1 (en) * 1999-08-02 2001-02-08 Power & Design Limited An attachment for a percussive tool
GB2351465B (en) * 1999-08-02 2003-02-19 James Kilpatrick An attachment for a percussive tool
US6681756B1 (en) 1999-08-02 2004-01-27 Power & Design Limited Attachment for a percussive tool
CN102275230A (en) * 2010-06-11 2011-12-14 五冶集团上海有限公司 Bushhammer used for chiseling concrete wall

Also Published As

Publication number Publication date
JPS55500145A (en) 1980-03-21
EP0018362A1 (en) 1980-11-12
CA1097970A (en) 1981-03-24
AU4480779A (en) 1979-09-20

Similar Documents

Publication Publication Date Title
US3955635A (en) Percussion drill bit
CA1202955A (en) Drill bit for jet assisted rotary drilling
EP1266125B1 (en) Rotatable cutting tool
US4280573A (en) Rock-breaking tool for percussive-action machines
US5066070A (en) Apparatus for reflex-percussive cutting of concrete etc.
US4106578A (en) Percussion drill bit
US20020108789A1 (en) Drilling head of a rock drill
CA1097970A (en) Scabbler bits
US3519092A (en) Percussion bit
PL113333B2 (en) Bit for mining machines
US6374931B1 (en) Multiple cutter rotary hammer bit
US2865606A (en) Rock drill
US20040065483A1 (en) Roof bit carbide blade
US4329766A (en) Tool for installing scarifier teeth
US4005906A (en) Impact or demolition tool
US4069880A (en) Excavation tool
US1995043A (en) Drill bit
GB2101657A (en) Miner bit
SU1747668A1 (en) Crown bit
US3738435A (en) Vibrating percussion bit
SU1430495A1 (en) Bit for rotary-percussive drilling
SU1093783A1 (en) Crown for rotary-percussive drilling
SU1696667A1 (en) Crown bit for percussion-rotary drilling
US893596A (en) Rock-drill.
GB1604660A (en) Percussive cutting machine

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): JP US

AL Designated countries for regional patents

Designated state(s): DE FR GB SE