GB2041289A - Road maintenance bits and blocks - Google Patents
Road maintenance bits and blocks Download PDFInfo
- Publication number
- GB2041289A GB2041289A GB8002484A GB8002484A GB2041289A GB 2041289 A GB2041289 A GB 2041289A GB 8002484 A GB8002484 A GB 8002484A GB 8002484 A GB8002484 A GB 8002484A GB 2041289 A GB2041289 A GB 2041289A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bit
- block
- shank
- bore
- section
- 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.)
- Granted
Links
- 238000012423 maintenance Methods 0.000 title description 4
- 239000010426 asphalt Substances 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- 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
- B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
- B28D1/186—Tools therefor, e.g. having exchangeable cutter bits
- B28D1/188—Tools therefor, e.g. having exchangeable cutter bits with exchangeable cutter bits or cutter segments
-
- 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
- E21C35/19—Means for fixing picks or holders
- E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements
Landscapes
- 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)
- Road Repair (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
A bit and block are disclosed wherein the bit 10 has a flat bar-like forward working portion 14 and a shank 16 rearwardly of said forward working portion. The shank, when viewed in cross section, has a noncircular shape so that, when placed in a support block 12 having a bore 26 of similar size and shape, the bit will not rotate in the block. An expansible clip 24 is used at the rear end of the bit, behind the shank portion, to hold the bit in the block. <IMAGE>
Description
SPECIFICATION
Excavation and road maintenance bits and blocks
This invention relates to excavation and construction tools and is especially concerned with blocks and bits used in road maintenance construction.
Recent advances in road maintenance techniques have involved the processes of soil stabilization, asphalt reclamation, road planing and other advances that conern themselves with the conservation of materials already present in old roadbeds and the like.
Road planing, for instance, involves the mounting of bits and blocks on a power driven rotary drum. Asphalt is planed off the old road surface as the drum rotates.and the bits strike or dig into the roadway. In asphalt, it is preferable to use bits that have a flat edge to shave the asphalt, rather than point-attack type bits that dig rather than scrape. This is because point-attack type bits find their greatest use in material that fractures once penetrated. Asphalt does not readily fracture once penetrated and, therefore, flat edged scraping type tools work best when road planing.
The point-attack type bits originally developed for coal mining (see United States Patent No.
3,519,309) also-found great use in construction type tools and other excavation type operations.
One of the favorable features of the point-attack bit was the retention of the bit in its support block by a resilient split keeper ring, described more fully in United States Patent No. 3,752,515.
Because the above-mentioned ring affords a very satisfactory and workable connection of the bit to the block, the use of such a ring has become almost universal in the industry. It is therefore, desirable to retain the resilient keeper ring when designing a bit for use with road planing equipment.
Cutter bits have been designed having flat forwardly working cutting edges for road planing but retaining the cylindrical shank, clip and recess of the point-attack type tools. Rotation is resisted by tangs that entered from the bit to the block or pins may be utilized extending through the bore of the block and mating with a special flat on the shank of the bit. Some instance of rotation still occurs, probably because impacting the bit can cause it to bounce longitudinally in its holder and possibly displace any tang or other extension utilized to prevent rotation.
According to the present invention, a road planing tool is disclosed having a forward working portion, a shank portion and attachment means for holding said tool in a mounting block.
The tool has a flat bar-like forward working portion with laterally extending shoulders and a rearwardly facing abutment shoulder formed at the juncture of the forward working portion with the shank.
The shank portion of the tool, when viewed in cross section, has lateral sides and a top and bottom side and a non-circular cross sectional
shape so it will not rotate when placed in a block
having a similarly shaped and sized bore. The
preferable cross sectional shape of the shank
portion is a semi-circular and semi-rectangular
cross section, although other non-round cross
sectional shapes, such as a polygonal trapezoidal
shape, might also work.
Rearwardly of the shank portion is a circular
section with a rearwardly located flange around
which is located a resilient clip that engages the
bore in the block to hold the bit in the block.
Preferably, the circular portion is recessed so as to
produce the flanged part and seat the clip.
It is an object of the present invention to
provide a bit and block especially designed for
road planing applications.
The exact nature of the present invention will
become more clearly apparent upon reference to
the following detailed specification taken in
connection with the accompanying drawings in
which:
Figure 1 is a perspective view showing the
assembly of the bit clip and block according to the
present invention.
Figure 2 is a side view of the bit, clip and block
of the present invention.
Figure 3 is a side view of the block according to
the present invention
Figure 4 is a view IV-lV through Figure 3.
Figure 5 is a side view of the bit according to
the present invention.
Figure 6 is a plan view of the bit according to
the present invention.
Figures 7, 8 and 9 are cross sectional shapes of
the shank portion of the bit according to the
present invention.
Referring to the drawings somewhat more in
detail, shown in Figure 1 is a bit 10 which fits into
a block 12 that may be mounted upon a power
driven rotatable drum such as is used in road
planing operations.
Bit 10 has a forward working portion 1 a shank portion 1 6 and a rearmost circular portion 1 8. Forward working portion 14 is flat and bar-like and has a rearwardly facing shoulder 20 formed at the juncture of the shank portion 1 6 with the forward working portion 14. Circular rearward portion 1 8 has a flange 22 formed thereon so that resilient clip 24 will fit around the circular portion
18 and hold the bit 10 in block 12.
Referring to Figure 2, what is shown therein is the bit 10 assembled in the block 12 with the block 12 having a bore that, in cross section is similarly shaped and sized to the shank portion 1 6 ,of bit 1 0. By similarly shaped and sized, it is
understood that the bore 26 of block 12 will be sized so as to accept shank 1 6 of block 12 and
hold the bit 10 so that it is nonrotatable with
respect to the block.
Referring to Figure 3, what is shown therein is bore 26 formed in block 12 and having a rearward
portion 28 that is circular in nature and, preferably, forms the internal shoulder 30. Clip 24 will then have means for abutting internal
shoulder 30 as is shown above in Figure 2 and will hold the bit within block 12.
Figure 4 shows a view IV-IV of Figure 3. In
Figure 4, it is preferable that the cross sectional
shape 26 is non-round in configuration and, as
shown in Figure 4, comprises a semi-circular
shape on the bottom and a semi-rectangular
shape on top.
Figures 5 and 6 show a side view and a plan
view of the bit 10 according to the present
invention that more fully illustrates the laterally
extending shoulders 20 that form rearwardly
facing abutment surfaces on the bit 10.
Rearwardly facing abutment surfaces 20, of
course, will abut with surfaces 32 and block 12 as
shown in Figure 1.
Figures 7, 8 and 9 illustrate various cross
sectional shapes that the shank 1 6 and the bore
26 can have. In Figure 7, the cross sectional shape
of the shank 1 6 or the bore 26 can have a
polygonal shape 34 which, as shown in Figure 7,
is preferably a trapezoid.
Figure 8 shows that the shank 1 6 of the bit 10
can have a semi-circular shape and a semi
rectangular shape so as to mate with the bore 26
shown in block 12 of Figure 4.
Figure 9 shows anther polygonal configuration 36 that may be adapted to the shank portion 1 6 in the bore 26 which must mate together so as to
prevent rotation of the bit 1 0 and block 1 2.
Modification may be made within the scope of the appended claims.
Claims (14)
1. A road planing tool which comprises: a forward working portion, a shank portion and attachment means for holding said tool in a mounting block, said forward working portion being flat, bar-like, and having laterally extending shoulders, a rearwardly facing abutment shoulder formed at the juncture of said shank portion and said working portion, characterized in that said shank has a non-circular and non-rectangular cross section so as not to rotate when placed in a block having a similarly shaped and sized bore, a flanged portion rearwardly of said shank and
resilient clip means around said bit forwardly of said flanged portion for engaging the bore of the
block and holding the bit in the block.
2. A road planing tool according to Claim 1, 11 or 12 further characterized in that said shank is semi-circular and semi-rectangular when viewed
in cross section.
3. A road planing tool according to Claim 2 further characterized in that a circular recess is
provided on said bit between said shank and said flange and said clip fits around said recess.
4. A road planing tool according to Claim 1, 11
or 12 further characterized in that said shank is
trapezoidal in cross section so as not to allow
rotation when placed in a block having a similarly sized and shaped bore.
5. A road planing tool according to Claim 4 further characterized in that a circular recess is provided on said bit between said shank and said flange and said clip fits around said recess.
6. A block assembled with a bit according to
Claim 1, 11 or 1 2 further chracterized in that a bore is similarly shaped as said cross section of said hank and sized so as to prevent rotation of said bit in said block and there is an enlarged recess behind said bore for engaging said clip on said bit.
7. A block assernbled with a bit according to
Claim 2 further characterized in that a bore is similarly shaped as said cross section of said shank and sized so as to prevent rotation of said bit in said block and there is an enlarged recess behind said bore for engaging said clip on said bit.
8. A block assembled with a bit according to
Claim 4 further characterized in that a bore is similarly shaped as said cross section of said shank and sized so as to prevnet rotation of said bit in said block and there is an enlarged recess behind said bore for engaging said clip on said bit.
9. A road planing bit according to Claim 1 or 12 further characterized in that said shank has a polygonal portion when viewed in cross section.
10. A block assembled with a bit according to
Claim 9 further characterized in that a bore assembly is shasped and sized similarly to said cross section of said shank of said bit so as to prevent rotation of said bit in said block.
11. A road planing tool according to Claim 1 further characterized in that said non-circular and non-rectangular cross section of said shank is a multi-sided geometric figure having at least one side of unique length so as not to allow rotation when placed in a block having a simiarly sized and shaped bore.
12. A road planing tool which comprises: a forward working portion, a shank portion and attachment means for holding said tool in a mounting block, said forward working portion being flat, bar-like, and having laterally extending shoulders, a rearwardly facing abutment shoulder formed at the juncture of said shank portion and said working portion, characterized in that said shank has a cross section whose geometric center lies on an axis parallel to but offset from the longitudinal axis of a flanged portion so as not to rotate when placed in a block having a similarly shaped and sized bor.e, said flanged portion rearwardly of said shank and resilient clip means around said bit forwardly of said flanged portion for engaging the bore of the block and holding the bit in the block.
13. A road planing tool constructed and arranged substantiaily as hereinbefore described with reference to and as illustrated in Figures 1 to 6 of Figure 7 of Figure 8 or Figure 9 of the accompanying drawings.
14. Any features of novelty taken singly, or in combination, of the embodiments hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US843579A | 1979-02-01 | 1979-02-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2041289A true GB2041289A (en) | 1980-09-10 |
| GB2041289B GB2041289B (en) | 1982-11-17 |
Family
ID=21731572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8002484A Expired GB2041289B (en) | 1979-02-01 | 1980-01-24 | Road maintenance bits and blocks |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU518204B2 (en) |
| CA (1) | CA1137803A (en) |
| DE (1) | DE3003743C2 (en) |
| GB (1) | GB2041289B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2519666A1 (en) * | 1982-01-08 | 1983-07-18 | Kennametal Inc | TRIMMING WITH MOUNT, INTENDED TO BE MOUNTED ON AN EARTHMOVING TOOL |
| EP0096585A1 (en) * | 1982-06-08 | 1983-12-21 | Koehring Company | An earth working machine |
| EP0151537A2 (en) * | 1984-01-31 | 1985-08-14 | Nl Industries Inc. | Improved drill bit and cutter therefor |
| EP0201073A2 (en) * | 1985-05-10 | 1986-11-12 | Hans Krummenauer GmbH & Co. KG | Pick holder for a cutting tool |
| US4743069A (en) * | 1985-03-19 | 1988-05-10 | Gte Products Corporation | Rotatable cutting bit |
| US4836614A (en) * | 1985-11-21 | 1989-06-06 | Gte Products Corporation | Retainer scheme for machine bit |
| US4865392A (en) * | 1985-07-18 | 1989-09-12 | Gte Products Corporation | Rotatable cutting bit |
| EP1000721A1 (en) * | 1998-11-10 | 2000-05-17 | BITELLI S.p.A. | Toolholder for milling drums of scarifying machine |
| US6354771B1 (en) | 1998-12-12 | 2002-03-12 | Boart Longyear Gmbh & Co. Kg | Cutting or breaking tool as well as cutting insert for the latter |
| US6554369B2 (en) | 2001-07-12 | 2003-04-29 | The Sollami Company | Cutting tool with hardened insert |
| USRE38151E1 (en) | 1985-07-18 | 2003-06-24 | Kennametal Inc. | Rotatable cutting bit |
| WO2016038021A1 (en) * | 2014-09-09 | 2016-03-17 | Betek Gmbh & Co. Kg | Pick, in particular a round-shank pick |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1235158A (en) * | 1958-09-16 | 1960-07-01 | Road milling machine for the production of indicator strips | |
| US3519309A (en) * | 1965-08-12 | 1970-07-07 | Kennametal Inc | Rotary cone bit retained by captive keeper ring |
| US3752515A (en) * | 1971-09-15 | 1973-08-14 | Kennametal Inc | Resilient keeper ring |
| DE2539707A1 (en) * | 1975-09-06 | 1977-03-17 | Marks & Co | Road surface cutter roller replaceable tooth - has conical bottom and constant top sections fitting corresponding roller recess |
| DE2644992A1 (en) * | 1976-10-06 | 1978-04-13 | Reinhard Wirtgen | Road surface stripper cutting mechanism - has lug shaped chisels rotating in radial depression on roller |
-
1980
- 1980-01-24 GB GB8002484A patent/GB2041289B/en not_active Expired
- 1980-01-24 AU AU54924/80A patent/AU518204B2/en not_active Ceased
- 1980-01-28 CA CA000344534A patent/CA1137803A/en not_active Expired
- 1980-02-01 DE DE19803003743 patent/DE3003743C2/en not_active Expired
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2519666A1 (en) * | 1982-01-08 | 1983-07-18 | Kennametal Inc | TRIMMING WITH MOUNT, INTENDED TO BE MOUNTED ON AN EARTHMOVING TOOL |
| EP0096585A1 (en) * | 1982-06-08 | 1983-12-21 | Koehring Company | An earth working machine |
| EP0151537A2 (en) * | 1984-01-31 | 1985-08-14 | Nl Industries Inc. | Improved drill bit and cutter therefor |
| EP0151537A3 (en) * | 1984-01-31 | 1986-05-28 | Nl Industries Inc. | Improved drill bit and cutter therefor |
| US4743069A (en) * | 1985-03-19 | 1988-05-10 | Gte Products Corporation | Rotatable cutting bit |
| EP0201073A3 (en) * | 1985-05-10 | 1987-02-04 | Hans Krummenauer Gmbh & Co. Kg | Pick holder for a cutting tool |
| EP0201073A2 (en) * | 1985-05-10 | 1986-11-12 | Hans Krummenauer GmbH & Co. KG | Pick holder for a cutting tool |
| US4865392A (en) * | 1985-07-18 | 1989-09-12 | Gte Products Corporation | Rotatable cutting bit |
| USRE38151E1 (en) | 1985-07-18 | 2003-06-24 | Kennametal Inc. | Rotatable cutting bit |
| US4836614A (en) * | 1985-11-21 | 1989-06-06 | Gte Products Corporation | Retainer scheme for machine bit |
| EP1000721A1 (en) * | 1998-11-10 | 2000-05-17 | BITELLI S.p.A. | Toolholder for milling drums of scarifying machine |
| US6354771B1 (en) | 1998-12-12 | 2002-03-12 | Boart Longyear Gmbh & Co. Kg | Cutting or breaking tool as well as cutting insert for the latter |
| US6554369B2 (en) | 2001-07-12 | 2003-04-29 | The Sollami Company | Cutting tool with hardened insert |
| WO2016038021A1 (en) * | 2014-09-09 | 2016-03-17 | Betek Gmbh & Co. Kg | Pick, in particular a round-shank pick |
| CN106795762A (en) * | 2014-09-09 | 2017-05-31 | 必泰克有限两合公司 | Chisel, especially round bar chisel |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2041289B (en) | 1982-11-17 |
| AU5492480A (en) | 1980-08-07 |
| DE3003743C2 (en) | 1985-10-03 |
| DE3003743A1 (en) | 1980-08-07 |
| CA1137803A (en) | 1982-12-21 |
| AU518204B2 (en) | 1981-09-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |