GB2257080A - Nut splitter - Google Patents
Nut splitter Download PDFInfo
- Publication number
- GB2257080A GB2257080A GB9113991A GB9113991A GB2257080A GB 2257080 A GB2257080 A GB 2257080A GB 9113991 A GB9113991 A GB 9113991A GB 9113991 A GB9113991 A GB 9113991A GB 2257080 A GB2257080 A GB 2257080A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blade
- nut
- nut splitter
- cutting edge
- splitter according
- 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
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D29/00—Hand-held metal-shearing or metal-cutting devices
- B23D29/007—Hand-held metal-shearing or metal-cutting devices for splitting nuts
Abstract
A nut splitter (Fig. 1) incorporates a cutter blade (11), the working edge (16) (Fig. 4) of which is of a blunt, rounded profile. The blade (11) is preferably an equilateral triangle in section, with a cutting edge (16) formed at each apex, thereby enabling use of a blade holder (10) which allows easy change of the working edge (16).
Description
Improvements in and relating to nut splitters
This invention relates to apparatus for dismantling bolted connections and in particular to apparatus for removing a nut from such a connection.
It is sometimes extremely difficult to remove a nut by conventional means, especially after prolonged exposure to a corrosive environment, for example seawater. Whilst there are power driven tools such as hydraulic wrenches, it isloften easier to simply cut the nut away or burn through it with a blow torch. Both of these methods have their own problems and/or risks, so relatively simple tools for splitting nuts have been developed.
A known nut splitter comprises a nut-encircling frame, or clamp which supports a cutting blade and means for forcing the blade into the side face of the nut to split it apart.
Common problems with existing nut splitters include the need for frequent blade replacement due to wear and tear, but more especially due to actual damage which is not repairable by re-grinding/sharpening. When as often happens the blade tip breaks off, a new blade is essential.
It is an object of the present invention to improve the performance of a conventional nut splitter.
According to the present invention, a nut splitter comprises a nut-encircling frame, a blade supported by and displaceable relative to said frame together with means for effecting said relative movement in a direction to split a nut within said frame, the cutting edge of said blade being formed with a blunt, rounded cross-section at said edge.
The blade is preferably triangular in cross-section, with an included angle at the cutting edge of from 40-60 . The blunted tip preferably has a radius of from 0.5 to 2.5 mm.
It is also preferred that the distal ends of the cutting edge are also rounded, the exact degree of rounding being not particularly critical.
According to a further aspect of the invention the blade is symmetrical in cross-section, each of the three apices of the resultant equilateral triangle being formed as a cutting edge of the kind just set forth. By this means, a single blade can be provided with three working edges instead of the one previously available. In the event of damage the blade need only be rotated through 1200 in order to present a different working edge for use.
Advantageously the nut splitter further incorporates a blade holder adapted to removably receive a blade having the cross-section of an equilateral triangle, thereby facilitating changing the working edge as necessary. The blade holder preferably includes means for retaining the blade. In practice a spring loaded ball detent is satisfactory for this, although other easily releasable means such as spring clips may be employed.
Surprisingly it has been found that the blunt, rounded edge profile of this invention is more efficient and considerably less vulnerable to damage than a conventional blade edge used for nut splitting. To illustrate this, the durability of a conventional, relatively sharp blade was compared with that of a blade with an edge according to this invention. Almost regardless of the metal used, the relatively sharp blade proved very liable to damage, including fracture of some or all of the cutting edge.
Failure occurred after splitting only a very small number of nuts, in some cases only a single nut. By contrast, the cutting edge of the present invention proved to be almost indestructible.
In order that the invention be better understood a preferred embodiment of it will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a plan view partly in section of a nut splitter according to the invention,
Figure 2 is a side elevation of a cutting blade for use in the nut splitter of Figure 1,
Figure 3 is a cross-sectional end view of the blade of
Figure 2 on line X-X thereof,
Figure 4 is a further cross-sectional end view of the blade of Figure 2, but on line Y-Y thereof,
Figure 5 is a plan view of a blade holder for the nut splitter of Figure 1, and
Figure 6 is a cross-sectional side view of the tool holder of Figure 5, on line Z-Z thereof.
In the interests of simplicity, like parts in all Figures employ the same reference numerals.
Referring firstly to Figure 1, the nut splitter comprises a nut-encircling frame 1 located at one end of a tubular extension 2. The frame shown mounted around a nut 3 on a bolt 4. The extension 2 comprises a hydraulic cylinder 5 and a piston 6, together with a disengagement spring 7, the latter serving to bias the piston away from the nut 3. An internal collar 8 serves as a sleeve bearing for a piston rod 9 which carries at its free end a cutting blade holder 10 attached by set screws 21. A blade 11 is shown seated in a recess 12 in the holder 10, the latter being best seen in Figures 5 and 6. The blade itself is best seen in
Figures 2-4.
The cylinder 5 has an oil inlet port 13 for the admission of hydraulic oil.
In operation, the piston and cylinder device is energised via port 13, to drive the blade 11 to engage the nut 3, trapping it firmly between the blade 11 and an abutment 14 on the inside of the frame 1 and located diametrically opposite to the blade 11. The latter is progressively driven into the nut 3 causing it to split apart along the diameter just mentioned.
Figure 2 shows the blade 11 of Figure 1 in side elevation with its distal corners 15 all rounded, to a radius of 2.0 mm.
In Figure 3, the section on X-X shows the blade corners 16 rounded to a radius of 1.5 - 1.8 mm and in both Figure 2 and Figure 3 ball detent recesses 20 are shown roughly intermediate the ends of the blade 11.
Figure 4 corresponds to Figure 3, but shows the blade cross-section without the ball detent recesses 20.
Referring now to Figures 5 and 6, the blade holder 10 is circular in plan and drilled for the mounting screws 21, (shown in Figure 1 only). The face of the holder contains a dovetail recess 22 into which the base of the triangular blade slides until a spring loaded ball detent 25 engages in one of the detent recesses 20. It will be apparent that with a blade of the preferred form, changing the working/cutting edge is a matter of pressing out the blade, turning through 1200 and then replacing it in the recess 22 to present one of the previous base edges as the cutting edge.
Claims (10)
1. A nut splitter comprising a blade supported by and
displaceable relative to said frame together with
means for effecting said relative movement in a
direction to split a nut within said frame, the
cutting edge of said blade being formed with a blunt,
rounded cross-section at said edge.
2. A nut splitter according to claim 1 wherein the blade
is triangular with an included angle at the cutting
edge of from 40-60 .
3. A nut splitter according to claim 1 or claim 2 wherein
said blunt, rounded cross-section has a radius of from
0.5 to 2.5 mm.
4. A nut splitter according to any preceding claim
wherein the distal ends of the cutting edge are
rounded.
5. A nut splitter according to any preceding claim
wherein the blade is symmetrical in cross-section,
each of the three apices of the resultant equilateral
triangle being formed as a cutting edge.
6. A nut splitter according to claim 5 including a blade
holder adapted to removably receive the blade so as to
present a selected edge as the cutting edge.
7. A nut splitter according to claim 6 wherein the blade
holder includes means for retaining the blade.
8. A nut splitter according to claim 7 wherein said means
is a spring loaded ball detent.
9. A nut splitter substantially as hereinbefore described
with reference to and as illustrated by the
accompanying drawings.
10. A blade for a nut splitter substantially as
hereinbefore described with reference to and as
illustrated by the accompanying drawings.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9113991A GB2257080B (en) | 1991-06-28 | 1991-06-28 | Improvements in and relating to nut splitters |
PCT/GB1992/001066 WO1993000193A1 (en) | 1991-06-28 | 1992-06-15 | Improvements in and relating to nut splitters |
AT92913295T ATE127050T1 (en) | 1991-06-28 | 1992-06-15 | IMPROVEMENTS REGARDING NUT SPROUTS. |
ES92913295T ES2076771T3 (en) | 1991-06-28 | 1992-06-15 | IMPROVEMENTS INTRODUCED IN NUT SPLITTERS. |
EP92913295A EP0591328B1 (en) | 1991-06-28 | 1992-06-15 | Improvements in and relating to nut splitters |
JP5501381A JPH06508565A (en) | 1991-06-28 | 1992-06-15 | Improvements in and related to nut splitters |
DE69204462T DE69204462T2 (en) | 1991-06-28 | 1992-06-15 | Improvements in nut spreader. |
US08/157,016 US5479710A (en) | 1991-06-28 | 1992-06-15 | Nut splitters |
NO934823A NO179403C (en) | 1991-06-28 | 1993-12-27 | nut Splitter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9113991A GB2257080B (en) | 1991-06-28 | 1991-06-28 | Improvements in and relating to nut splitters |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9113991D0 GB9113991D0 (en) | 1991-08-14 |
GB2257080A true GB2257080A (en) | 1993-01-06 |
GB2257080B GB2257080B (en) | 1994-11-30 |
Family
ID=10697494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9113991A Expired - Fee Related GB2257080B (en) | 1991-06-28 | 1991-06-28 | Improvements in and relating to nut splitters |
Country Status (9)
Country | Link |
---|---|
US (1) | US5479710A (en) |
EP (1) | EP0591328B1 (en) |
JP (1) | JPH06508565A (en) |
AT (1) | ATE127050T1 (en) |
DE (1) | DE69204462T2 (en) |
ES (1) | ES2076771T3 (en) |
GB (1) | GB2257080B (en) |
NO (1) | NO179403C (en) |
WO (1) | WO1993000193A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2464325A (en) * | 2008-10-13 | 2010-04-14 | Scottool Ltd | A tool for removing a compression ring |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5848621A (en) * | 1996-03-22 | 1998-12-15 | Illinois Tool Works Inc. | Cutter for steel strapping tool |
EP1213078A3 (en) * | 2000-12-07 | 2004-03-24 | Corporacion Nacional Del Cobre De Chile | A nut splitting device |
US7686006B1 (en) * | 2003-04-02 | 2010-03-30 | Jt Sports, Llc | Air system attachment on paintball marker |
US6912933B2 (en) * | 2003-04-11 | 2005-07-05 | Brian Knopp | Hydraulic torque wrench system |
US6928739B2 (en) * | 2003-06-20 | 2005-08-16 | Spx Corporation | Tool force transmitting method and apparatus |
CA2457968A1 (en) * | 2004-02-19 | 2005-08-19 | Intregra Technologies Limited | Hydraulic nut assembly |
GB2479487B (en) | 2006-09-27 | 2012-02-15 | Caterpillar Inc | Metal shears |
US20090139094A1 (en) * | 2007-12-04 | 2009-06-04 | Pierre Beloin | Coconut Splitting Device |
US8209835B2 (en) * | 2008-08-22 | 2012-07-03 | Huffer Brian J | Compression sleeve splitter and removal tool |
US11717899B2 (en) * | 2017-08-09 | 2023-08-08 | The Boeing Company | Lock bolt collar removal tool |
CN107891428B (en) * | 2017-10-13 | 2021-01-26 | 国网智能科技股份有限公司 | Nut breaking tool special for live working robot, robot and working method of robot |
CN108213600A (en) * | 2018-03-07 | 2018-06-29 | 府谷县旭丽机电技术有限公司 | A kind of break-in tool for being used for rivet and boxing nut |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1148432A (en) * | 1966-02-23 | 1969-04-10 | Ici Ltd | Tool for splitting hollow bodies |
GB1601772A (en) * | 1978-03-21 | 1981-11-04 | Gkn Bolts & Nuts Ltd | Device for splitting nuts |
EP0192409A1 (en) * | 1985-02-14 | 1986-08-27 | Allspeeds Limited | Fastener splitter device |
GB2199528A (en) * | 1986-11-04 | 1988-07-13 | Huck Mfg Co | Method of and tool for cutting a collar off a fastener |
GB2215254A (en) * | 1988-02-01 | 1989-09-20 | Lee Juang Jeng | Nut splitter with the function of a wrench |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1015423A (en) * | 1962-03-30 | 1965-12-31 | Mcalpine & Sons Ltd Sir Robert | Improved paving breaker steel |
JPS5299415A (en) * | 1976-02-17 | 1977-08-20 | Kubota Ltd | Device for air supply and water level regulation of pressure water tan k |
US3992777A (en) * | 1976-03-22 | 1976-11-23 | Nut Cutters, Inc. | Tool for releasing a nut threaded onto a bolt |
US4257163A (en) * | 1979-04-27 | 1981-03-24 | Wolfgang Bauer | Automotive service tool |
US4285126A (en) * | 1979-09-04 | 1981-08-25 | Lawrence Irwin F | Hydraulically actuated apparatus |
JPS583624Y2 (en) * | 1979-09-26 | 1983-01-21 | 橋本 修二 | Rusted nut cutting machine |
US4549324A (en) * | 1984-05-18 | 1985-10-29 | Liou Mou T | Combination of screw spanner and nut breaker |
DE3439491A1 (en) * | 1984-10-27 | 1986-04-30 | Gerd 5303 Bornheim Elfgen | ROUNDING CHISEL |
US4875289A (en) * | 1988-04-04 | 1989-10-24 | Poling Denzil C | Chisel for removing damaged bolts, nuts and screws |
US5070616A (en) * | 1991-04-22 | 1991-12-10 | Chen Chin L | Hydraulic type pipe cutter |
-
1991
- 1991-06-28 GB GB9113991A patent/GB2257080B/en not_active Expired - Fee Related
-
1992
- 1992-06-15 AT AT92913295T patent/ATE127050T1/en not_active IP Right Cessation
- 1992-06-15 US US08/157,016 patent/US5479710A/en not_active Expired - Fee Related
- 1992-06-15 DE DE69204462T patent/DE69204462T2/en not_active Expired - Fee Related
- 1992-06-15 JP JP5501381A patent/JPH06508565A/en active Pending
- 1992-06-15 WO PCT/GB1992/001066 patent/WO1993000193A1/en active IP Right Grant
- 1992-06-15 ES ES92913295T patent/ES2076771T3/en not_active Expired - Lifetime
- 1992-06-15 EP EP92913295A patent/EP0591328B1/en not_active Expired - Lifetime
-
1993
- 1993-12-27 NO NO934823A patent/NO179403C/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1148432A (en) * | 1966-02-23 | 1969-04-10 | Ici Ltd | Tool for splitting hollow bodies |
GB1601772A (en) * | 1978-03-21 | 1981-11-04 | Gkn Bolts & Nuts Ltd | Device for splitting nuts |
EP0192409A1 (en) * | 1985-02-14 | 1986-08-27 | Allspeeds Limited | Fastener splitter device |
GB2199528A (en) * | 1986-11-04 | 1988-07-13 | Huck Mfg Co | Method of and tool for cutting a collar off a fastener |
GB2215254A (en) * | 1988-02-01 | 1989-09-20 | Lee Juang Jeng | Nut splitter with the function of a wrench |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2464325A (en) * | 2008-10-13 | 2010-04-14 | Scottool Ltd | A tool for removing a compression ring |
GB2464325B (en) * | 2008-10-13 | 2012-08-08 | Scottool Ltd | Compression ring removal tool |
Also Published As
Publication number | Publication date |
---|---|
ES2076771T3 (en) | 1995-11-01 |
US5479710A (en) | 1996-01-02 |
DE69204462D1 (en) | 1995-10-05 |
EP0591328B1 (en) | 1995-08-30 |
NO934823D0 (en) | 1993-12-27 |
WO1993000193A1 (en) | 1993-01-07 |
NO179403B (en) | 1996-06-24 |
NO179403C (en) | 1996-10-02 |
ATE127050T1 (en) | 1995-09-15 |
EP0591328A1 (en) | 1994-04-13 |
JPH06508565A (en) | 1994-09-29 |
GB2257080B (en) | 1994-11-30 |
NO934823L (en) | 1993-12-27 |
GB9113991D0 (en) | 1991-08-14 |
DE69204462T2 (en) | 1996-03-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20020628 |