GB2405362A - Resilient loading device and bearing arrangement - Google Patents
Resilient loading device and bearing arrangement Download PDFInfo
- Publication number
- GB2405362A GB2405362A GB0417796A GB0417796A GB2405362A GB 2405362 A GB2405362 A GB 2405362A GB 0417796 A GB0417796 A GB 0417796A GB 0417796 A GB0417796 A GB 0417796A GB 2405362 A GB2405362 A GB 2405362A
- Authority
- GB
- United Kingdom
- Prior art keywords
- loading device
- bearing
- sleeve
- bearing sleeve
- ring
- 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
- 210000001699 lower leg Anatomy 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims description 6
- 229910000906 Bronze Inorganic materials 0.000 claims description 5
- 239000010974 bronze Substances 0.000 claims description 5
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000013618 particulate matter Substances 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 6
- 238000005096 rolling process Methods 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 239000011800 void material Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000013077 target material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/12—Mills with at least two discs or rings and interposed balls or rollers mounted like ball or roller bearings
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Support Of The Bearing (AREA)
Abstract
A loading device 10, incorporated in to a ring and ball mill, comprises a piston/sleeve arrangement 14, supported with at least one bearing element 22 and a bearing housing 23 and is characterised by the bearing element 22 being provided with a bearing sleeve 22. The device 10 has a closed end 11 and comprises a C-shaped housing. A shaft member 12 is supported at one end by an elastomeric rolling diaphragm 12 which is attached to the piston 14. The whole arrangement being arranged on spherical self-aligning bearings 16 and by the flanged coupling 17 of the moving end. Inner void 18, charged with nitrogen gas or the like, provides the necessary loading force. Other elements include a dirt wiping seal 19, a gaiter seal 20, sliding bearing arrangement 15, and retaining collar 24. Associated methods are also disclosed.
Description
ce ce: ë -
RESILIENT LOADING DEVICE
This invention relates to a resilient loading device. In particular, but not exclusively, the present invention relates to a loading device for use in pulverised fuel grinding mills.
Electricity can be generated by a variety of means. The most common is to drive the electric alternator device via a 3 stage steam turbine. Steam to feed the turbine can be raised by a number of methods, the most common being through heat generated by solid fuel, e.g. coal, fired boilers.
To obtain maximum calorific value from the fuel, coal is usually pulverised or ground in a mill, specifically a ring and ball mill, to form a fine powder. This pulverised fuel is then transported pneumatically directly into the steam raising boilers where combustion takes place.
Babcock type "E" slow speed ring and ball mills (types 7E9; 7E10, 8.5E9, 8.5E10, 10E10, 10.9E8, 10.9E10, 10.9EII, 12E10 and 12.9E10) have been widely used for many years by the world wide power generation. They are also used, for example, in the manufacture of cement.
The fundamental principle of a ring and ball mill is that the coal is fed by gravity onto two rotating horizontally mounted circular tracks, an upper track and a lower track. Sandwiched between the upper and lower tracks are a number of cast, spherical balls. Usually, the lower track is driven via an electric motor and reduction gearbox, whilst the upper track is forced down onto the balls and lower track by a series of resilient loading devices. The loading forces provided by these devices urge the balls onto a grinding surface of the lower track where target material, such as coal, is ground. 1,
-e:e c: .' . . . . . . The resilient loading devices, called loading rams, were originally generally similar in principle to a single acting hydraulic/pneumatic actuator. The loading force however, was generated by pressurised nitrogen gas acting on the ram surface Radial loads were accommodated by a sleeve bearing which was lubricated with mineral oil at a pressure greater than the nitrogen gas. The sleeve was sealed at both ends and thus provided the assembly with both a lubricated bearing and a barrier to prevent loss of nitrogen gas.
Availability of plant in a modern power station is of prime importance to ensure economic production of electricity. A major objective with a ring and ball mill is that all ancillary equipment on the unit will last at least the life of the ring and ball set.
However, for many reasons, this had proven not to be possible. In particular, in practice, the original sealing arrangement for the oil lubricated sleeve had to be modified many times.
Attempts have been made to overcome this problem. Thus, South African Patent No. 9707146 describes a resilient loading device for use with a ring and ball mill wherein the oil lubricated sleeve arrangement is replaced with a plain unlubricated sleeve wherein there is fitted a modified plastic material bearing liner. The non atmospheric side of the device is totally sealed from the atmospheric side by the use of a rolling element diaphragm seal, sometimes referred to as a "bladder" or "bag".
However, it has been found that, although the service life of the device is generally extended to equal, and some times exceed, the requirements of the industry there remains the disadvantage that the ram can wear through the modified plastic bearing liner and contact the metal (normally mild steel) housing causing damage to the surface of the ram.
Another problem is that whilst loading rams are required around the world and for different uses, the connection of such rams to machinery such as a mill is dictated by 1 e C the particular machine itself. Many different kinds of connection are known and it is inconvenient to have to adapt rams to fit a connection at a particular site.
It is an aim of embodiments of the present invention to at least partly mitigate the above-mentioned problems.
Thus, according to the invention we provide a loading device comprising a piston/sleeve arrangement wherein one end of the piston is provided with at least one bearing element and a bearing housing characterized in that the bearing element is provided with a bearing sleeve.
Thus the loading device is, preferentially, a resilient loading device. The bearing element may comprise a single, e.g. annular, bearing. However, preferably, the device is provided with a plurality of bearings, e.g. two bearings. The bearings may surround the whole of the end of the shaft. However, it is preferred that when the device comprises a plurality of bearings that the bearings are slidably mounted about the shaft of the device, e.g. axially slidable.
In an especially preferred embodiment the bearing sleeve is positioned such that it completely surrounds the bearing(s). Preferentially the bearing sleeve is positioned between the bearing elements and the bearing housing.
In one aspect of the invention the device is provided with a retaining collar and a second seal assembly. Thus, the bearing sleeve may be positioned between the retaining collar and the second seal assembly. Alternatively, the bearing sleeve may be positioned such that the sleeve is held in position by the retaining collar, e.g. the retaining collar overlies the bearing sleeve.
The second seal assembly may comprise a variety of seals known per se. Preferably the second seal assembly is designed to prevent the ingress of particulate matter, e.g. dust, such as ground coal dust. Thus, the second seal assembly may comprise a - single seal or a plurality of seals. Preferably, the second seal assembly may comprise a dirt wiping seal or a gaiter seal. In an especially preferred embodiment the second seal assembly comprises both a dirt wiping seal and a gaiter seal.
The bearing sleeve is novel per se. Thus, according to a further aspect of the invention we provide a bearing sleeve suitable for use in connection with a loading device as hereinbefore described.
The bearing sleeve bearing elements may be made from a suitable bearing material, however, a preferred material is a composite low friction thermoses plastic. An example of a suitable thermoses plastic is a PTFE compound, such as, PTFE bronze, PTFE graphite, PTFE carbon, etc..
According to a further aspect of the invention we also provide a ring and ball mill comprising a loading device as hereinbefore described.
We especially provide a ring and ball mill comprising a plurality of such loading devices.
We further provide the use of a loading device as hereinbefore described in the manufacture of a ring and ball mill.
In an alternative aspect of the invention we provide the use of a bearing sleeve in the manufacture of a loading device as hereinbefore described.
We do also provide a method of pulverising a material, e.g. coal, which comprises the use of a ring and ball mill of the invention.
We have now therefore improved the design of known bearing arrangements and incorporated a replaceable bearing sleeve together with replaceable bearing bands such that should they wear through the ram will come into contact with a phosphor :: te: .:: eet: . e e e e bronze bearing grade material. Furthermore, the whole bearing sleeve assembly is l now replaceable and can be renewed without the need to causing major damage to the entire unit. l Another particular advantage of the use of the bearing sleeve according to embodiments of the invention is that it may, inter alla, act as, for example, a type of sacrificial device. The bearings, e.g. annular bearing rings or bands, which are located within the sleeve, support the radial loads imparted by the ram and are in intimate contact with the ram. In normal use, the bearing sleeve inner diameter does not actually "bear" onto the ram, and is toleranced to be clear of the ram. However should one or more of the bearings fail or wear, the ram may then run against the sleeve. Thus, the sleeve, or a portion of the sleeve, can act as an emergency bearing.
The invention will now be described hereinafter, by way of example only, and with reference to the accompanying drawing, in which: Figure 1 is a cross-sectional representation of a loading device; Figure 2 illustrates a further embodiment of a biasing apparatus; Figure 3 illustrates a still further embodiment of a biasing apparatus; and Figure 4 illustrates a bearing.
The loading device (10) consists of cylindrical steel housing which has one end closed (11). The housing is generally C-shaped. A rod or other shaft-like member (12) is supported at one end by an elastomeric rolling diaphragm device (13), attached to a piston like arrangement ( 14) at the end of the rod.
The other end of the rod or shaft is supported by a sliding bearing arrangement (15).
The whole assembly is mounted on spherical self aligning bearings (16) at the closed 1 :e it. eac ct*. '' a. Itee end and by a flanged coupling (17) at the moving end., The coupling methods used are dependent upon application, to ensure that the assembly, when in service, is positively located.
To provide the loading force the inner void (18) created by the rolling diaphragm is charged with a suitable medium, for example nitrogen gas, at a pressure greater than atmospheric pressure which will create rod extension. However it is more likely to be in the region of 12 times atmospheric pressure minimum and 25 times atmospheric pressure maximum. This causes the rod to move out from the body of the loading device creating a compressive load between the fixed points of the ring and ball mill.
A dirt wiping seal (19) and bellows or gaiter seal (20) are included in the design to exclude the ingress of ground coal dust into the bearing area of the loading device as this would have a negative effect on the integrity of the bearing arrangement.
The design of the bearing assembly as described in ZA9709146 shows a one piece steel bearing housing welded to the cylinder, the bearing housing utilises bearing elements of a composite low friction thermoses plastic. The disadvantage of this was that should the plastic bearing elements fail in service, resulting in the rod contacting the steel bearing housing extreme wear would occur.
However, we have found that by utilising a sliding bearing arrangement (15) which includes a bearing sleeve (21) manufactured from a suitable bearing material, for example phosphor bronze, should the bearing elements (22) wear such that the rod (12) comes into contact with the bearing sleeve (21) the rod will not be damaged.
Moreover, we have also designed the bearing sleeve (21) in such a manner so that it may be positively located in a bearing housing (23) by a retaining ring or collar (24).
The retaining ring is of split construction to facilitate ease of fitting to the end cap (25) 6 1 2,. '1 1.,.
This design has the advantage over the prior art in that should the bearing sleeve (21) need replacing, following metal to metal contact, the sliding bearing housing (23) does not have to be destroyed to remove the bearing.
Figure 2 illustrates a loading device according to a further embodiment of the present invention.
Figure 2a illustrates a cut-away image whilst Figure 2b illustrates an outer view of the device which is rotated through 90 with respect to the device shown in Figure 2a.
As described above, the loading device (10) provides apparatus which can produce urging forces such as the loading forces needed in grinding mills. A generally C or U-shaped outer housing has a closed end (11) which houses within it a rolling diaphragm (13). The open mouth of the housing is closed with an end cap (25) on which a sliding bearing arrangement (15) is secured. The rod (12) extends longitudinally within the housing and is supported by the bearing arrangement at one end of the housing. This provides a sliding support. At the other end of the piston rod is a piston-like arrangement (14) which is secured to the rolling diaphragm (13).
As fluid, such as nitrogen gas, is introduced into the diaphragm, the piston rod is urged away from the closed end of the housing (in a direction to the right of Figure 2). A free end of the rod may be secured to other elements by the flanged coupling (17). By continually maintaining a high pressure within the diaphragm the free end of the piston is continually urged away from the closed end of the housing.
According to the embodiment of the present invention illustrated in Figure 2, an end cap (30) is provided to close the closed end (11) of the housing. The end cap includes a first portion (31) to which an open mouth of the diaphragm (13) is sealed and a connecting portion (32) secured to the cap (31). The connecting portion (32) provides a coupling which is arranged to receive a broad range of bearings. This enables different types of bearing to be connected to the loading device according to the particular bearing required at a particular work site. As illustrated in Figure 2, a radial rod end bearing (33), which looks like a tongue element, may be connected to the end cap (30) via securing pins (34).
Figure 2b illustrates a side view of the radial rod end bearing (33) in more detail. A central hole (35) is provided in the tongue member (33) and this can receive a securing pin, which may be a clevis pin, to secure the radial rod end bearing to a clevis joint or other such member.
Figure 2c illustrates an end-on view of the loading device and illustrates an arrangement of securing holes (36) which may receive securing screws (34) to fix the radial rod end bearing to the closed end of the loading device. By selectively arranging the holes on the end cap (30) during manufacture the angle at which the radial rod end bearing may be secured to the loading device may be selected.
Figure 3 illustrates apparatus for providing loading forces according to a further embodiment of the present invention.
Figure 3a illustrates a cut-away view of the apparatus whilst Figure 3b illustrates a view of the outer surface of the device of Figure 3a rotated by 90 . The apparatus illustrated in Figure 3 is similar to that described with respect to Figure 2, except that the end cap (30) formed by a first portion (31) to which the diaphragm is connectively sealed, and connecting portion (32) is secured to a housing (40) having a screw- threaded receiving region (41) which is arranged to receive a similarly screw-threaded lug region (42) as illustrated in Figure 4. As shown in Figure 4, the loading device may be secured to a body (43) of a mill via a connecting bearing. The bearing in Figure 4 is of the type known as an axial thrust bearing (44) which includes two sliding members (45) and (46) which have a substantially hemispherical lower and upper surface respectively. These surfaces are slidably engaged with matching sliding surfaces to enable the axial thrust bearing to rock and twist with respect to the body. In this way the loading device may be axially constrained with respect to the mill body but rotational compliance is permitted. 1.
As illustrated in Figure 3c, which shows an end-on view of the urging apparatus, the connector (40) may be connected to the connecting portion (32) of the end cap (30) of the loading device. The device may then be attached by screwing the lug (42) into the orifice (40) at a work site or other target location.
Embodiments of the present invention thus provide an apparatus which can provide urging forces in a desired direction. The apparatus may be secured in any direction at a target location by means of a bearing. By providing a universal connection formed by an end cap, the device provides a modular unit which enables a multitude of ways of fitting the device to a desired bearing and thus to a mill or other such device.
Embodiments of the present invention have been described hereinabove by way of example only. It will be understood that the present invention is not limited to the specific detail set out in the description. Rather, it will be understood that modifications to the present invention may be made without departing from the scope of the present invention.
Claims (35)
1. A loading device comprising a piston/sleeve arrangement wherein one end of the piston is supported with at least one bearing element and a bearing housing characterized in that the bearing element is provided with a bearing sleeve.
2. A loading device according to claim I wherein the bearing sleeve is a replaceable bearing sleeve.
3. A loading device according to claim 1 wherein the loading device is a resilient loading device.
4. A loading device according to claim I wherein the bearing element comprises a single annular bearing.
5. A loading device according to claim 1 wherein the bearing element comprises a plurality of bearings.
6. A loading device according to claim 5 wherein the bearing element comprises two bearings.
7. A loading device according to claim I wherein each bearing element surrounds the whole of the end of the piston shaft.
8. A loading device according to claim 5 wherein the device comprises a plurality of bearings slidably mounted about the piston shaft.
9. A loading device according to claim 8 wherein the bearings are axially slidable about the piston shaft.
::. c. e. . e. . . e. :
10. A loading device according to claim I wherein the bearing sleeve is located within a bearing housing.
11. A loading device according to claim I wherein the bearing sleeve is positioned such that it completely surrounds each bearing element.
12. A loading device according to claim 11 wherein the sleeve is positioned between the at least one bearing element and the bearing housing.
13. A loading device according to claim I wherein the device is provided with a retaining collar and a second seal assembly.
14. A loading device according to claim 13 wherein the bearing sleeve is longitudinally positioned between the retaining collar and the second seal assembly.
15. A loading device according to claim 13 wherein the bearing sleeve is positioned such that the sleeve is held in position by the retaining collar.
16. A loading device according to claim 13 wherein the retaining collar overlies the bearing sleeve.
17. A loading device according to claim 13 wherein the second seal assembly is arranged to prevent the ingress of particulate matter.
18. A loading device according to claim 13 wherein the second seal assembly comprises a plurality of seals.
19. A loading device according to claim 18 wherein the second seal assembly comprises a dirt wiping seal or a gaiter seal.
::. :. .... .
20. A loading device according to claim 18 wherein the second seal assembly comprises both a dirt wiping seal and a gaiter seal.
21. A loading device according to claim 10 wherein the bearing housing comprises a phosphor bronze material.
22. A loading device according to any preceding claim, further comprising an end cap arranged to receive a plurality of bearing types.
23. The loading device according to claim 22 wherein the end cap includes two or more securing elements arranged to enable a bearing to be secured to the loading device at more than one possible angle.
24. A bearing sleeve suitable for use in connection with a loading device according to any preceding claim.
25. A bearing sleeve according to claim 24 wherein the bearing sleeve is made from a suitable material.
26. A bearing sleeve according to claim 25 wherein the bearing sleeve is made from composite low friction thermoses plastic.
27. A bearing sleeve according to claim 26 wherein thermoses plastic is a PTFE compound.
28. A bearing sleeve according to claim 27 wherein the PTFE compound is selected from the group, including PTFE bronze, PTFE graphite and PTFE carbon.
29. A ring and ball mill comprising at least one loading device according to claim 1.
:. :. eeceee. ...
30. A ring and ball mill according to claim 29 wherein the ring and ball mill comprises a plurality of loading devices according to claim 1.
31. The use of a loading device according to claim I in the manufacture of a ring and ball mill.
32. The use of a bearing sleeve in the manufacture of a loading device according to claim 1.
33. A method of pulverising a material which comprises the use of a ring and ball mill device according to claim 29.
34. A method according to claim 33 characterized in that the material is coal.
35. A loading device or ring and ball mill substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0319403.2A GB0319403D0 (en) | 2003-08-19 | 2003-08-19 | Resilient loading device |
Publications (3)
Publication Number | Publication Date |
---|---|
GB0417796D0 GB0417796D0 (en) | 2004-09-15 |
GB2405362A true GB2405362A (en) | 2005-03-02 |
GB2405362B GB2405362B (en) | 2007-07-25 |
Family
ID=28052721
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GBGB0319403.2A Ceased GB0319403D0 (en) | 2003-08-19 | 2003-08-19 | Resilient loading device |
GB0417796A Expired - Fee Related GB2405362B (en) | 2003-08-19 | 2004-08-11 | Loading device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GBGB0319403.2A Ceased GB0319403D0 (en) | 2003-08-19 | 2003-08-19 | Resilient loading device |
Country Status (2)
Country | Link |
---|---|
GB (2) | GB0319403D0 (en) |
WO (1) | WO2005019657A2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112604753B (en) * | 2020-10-23 | 2022-06-03 | 江山华隆能源开发有限公司 | Biomass waste treatment equipment |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191019982A (en) * | 1910-08-27 | 1911-04-06 | Robert Henry Place | Improvements in Reversing Mechanism for Dobbies of Looms for Weaving. |
GB247756A (en) * | 1925-03-10 | 1926-02-25 | Charles Edward Vincent Hall | Improvements in and relating to ball and ring and roller and ring mills for grinding and crushing |
GB601608A (en) * | 1945-05-31 | 1948-05-10 | Nordberg Manufacturing Co | Improvements in fine reduction mills and method of fine reduction |
ZA977146B (en) * | 1996-08-15 | 1998-02-19 | Lockhyd Ind Hydraulics Pty Ltd | Resilient loading device. |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191419982A (en) * | 1914-09-19 | 1915-09-20 | Edward Francis Mccool | Improvements in Grinding Mills. |
GB895873A (en) * | 1960-03-16 | 1962-05-09 | Automotive Prod Co Ltd | Improvements in or relating to loading means for maintaining dynamic loading on annular thrust members |
GB1006869A (en) * | 1962-11-12 | 1965-10-06 | Babcock & Wilcox Ltd | Improvements in or relating to transducers for converting fluid pressures to thrustsor vice-versa |
US4744444A (en) * | 1978-04-12 | 1988-05-17 | Craig L. Gillingham | Shock absorber |
DE3143463A1 (en) * | 1981-11-03 | 1983-05-11 | Gebr. Pfeiffer Ag, 6750 Kaiserslautern | SEALING FOR TOW RODS OF ROLL MILLS |
US4832352A (en) * | 1987-03-27 | 1989-05-23 | United Stirling Ab | Piston rod seal |
US5265852A (en) * | 1991-10-01 | 1993-11-30 | Die, Mold & Automation Components, Inc. | Gas spring with gas passageways in the assembly housing and piston rod |
US5934646A (en) * | 1997-04-04 | 1999-08-10 | Nok Corporation | Gate valve and cylinder apparatus |
AUPO779497A0 (en) * | 1997-07-10 | 1997-07-31 | Davtaire Pty. Ltd. | Improved sealing bearing assembly |
DE10026356A1 (en) * | 2000-05-27 | 2001-12-13 | Volkswagen Ag | Piston rod guide especially for vibration dampers has through opening with three socket sections with ring washer fitted in wider third socket to axially secure sealing ring bearing against piston rod |
-
2003
- 2003-08-19 GB GBGB0319403.2A patent/GB0319403D0/en not_active Ceased
-
2004
- 2004-08-11 WO PCT/GB2004/003449 patent/WO2005019657A2/en active Application Filing
- 2004-08-11 GB GB0417796A patent/GB2405362B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB191019982A (en) * | 1910-08-27 | 1911-04-06 | Robert Henry Place | Improvements in Reversing Mechanism for Dobbies of Looms for Weaving. |
GB247756A (en) * | 1925-03-10 | 1926-02-25 | Charles Edward Vincent Hall | Improvements in and relating to ball and ring and roller and ring mills for grinding and crushing |
GB601608A (en) * | 1945-05-31 | 1948-05-10 | Nordberg Manufacturing Co | Improvements in fine reduction mills and method of fine reduction |
ZA977146B (en) * | 1996-08-15 | 1998-02-19 | Lockhyd Ind Hydraulics Pty Ltd | Resilient loading device. |
Also Published As
Publication number | Publication date |
---|---|
WO2005019657A3 (en) | 2005-05-12 |
GB2405362B (en) | 2007-07-25 |
GB0319403D0 (en) | 2003-09-17 |
GB0417796D0 (en) | 2004-09-15 |
WO2005019657A2 (en) | 2005-03-03 |
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