GB2147636A - Yieldable stilts for mine roof supports - Google Patents
Yieldable stilts for mine roof supports Download PDFInfo
- Publication number
- GB2147636A GB2147636A GB08423817A GB8423817A GB2147636A GB 2147636 A GB2147636 A GB 2147636A GB 08423817 A GB08423817 A GB 08423817A GB 8423817 A GB8423817 A GB 8423817A GB 2147636 A GB2147636 A GB 2147636A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stilt
- leg
- mine roof
- roof support
- receptacle
- 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.)
- Withdrawn
Links
- 241000272165 Charadriidae Species 0.000 title claims abstract description 80
- 230000004048 modification Effects 0.000 description 9
- 238000012986 modification Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/16—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
- E21D15/22—Telescopic props with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure with member, pin, cross- piece, or the like, ruptured, sheared through, or permanently deformed upon excessive pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Tents Or Canopies (AREA)
Abstract
A yieldable stilt of the kind arranged to receive the leg of a mine roof support and having at least one bendable member 24 serving as a cradle for the lower end of the leg, allowing the leg to move downwards at a controlled rate over the working life of the stilt. In order that the yield resistance of the stilt can be adjusted in a stepless manner, screw means (22) am provided whereby the degree of flexing of the bendable member (24) during use of the stilt can be adjusted. <IMAGE>
Description
SPECIFICATION
Yieldable Stilts for Mine Roof Supports
The invention relates to yieldable stilts for mine
roof supports, that is to say to mine roof support stilts of the kind which are arranged to receive the
leg of a mine roof support and to allow the leg to
move downwards at a controlled rate when the pressure on the roof support exceeds a predetermined maximum.
When a yieldable stilt of the kind just referred to is in use, the lower end of the leg of the mine roof support which it receives is initially supported above the mine floor and is allowed to move downwards at a controlled rate over the working life of the stilt, and ideally the stilt should exhibit a substantially constant resistance so that a graph plotting load against displacement should be substantially a straight line.
In one particular construction of yieldable stilt of the kind referred to, a receptacle element of the stilt is arranged to receive the lower end of the mine roof support leg, and a bendable member is accommodated in the receptacle and serves as a cradle for the lower end of the leg. The bendable member, which may be constituted by a length of steel strip, may be formed so as to have two arms each arranged to flex over curved surfaces provided towards the upper end of the receptacle and to be taken downwardly into the receptacle so that outward movement of the arms is opposed by opposite sides of the receptacle, the curved surfaces conveniently being constituted by respective rollers.
Such a construction of yieldable stilt has been used for some considerable time and generally works quite well. If it is required to increase the load at which the stilt will yield, this can be done by fitting the stilt with a thicker length of steel strip. Thus, when pressure is imposed on the roof support it is permitted to lower at a rate determined by the dimensions of the strip material which has been selected for the bendable member. However, the yield resistance of the stilt cannot be adjusted in any way other than in such a stepwise manner.
The object of the invention is to provide a yieldable stilt the yield resistance of which can be adjusted in a stepless manner.
According to the invention, there is provided a yieldable stilt for a mine roof support, the stilt including a receptacle element arranged to receive the lower end of the leg of the mine roof support, and at least one bendable member accommodated in the receptacle and serving as a cradle for the lower end of the leg, the or each bendable member being caused to flex in sinuous fashion as the leg of the mine roof support moves downwards within the receptacle, means being provided whereby the degree of flexing is adjusted so that the yield resistance is adjusted in a stepless manner.The arrangement will preferably be such that the degree of flexing can be reduced to such an extent that the leg of the mine roof support is caused to move downwards within the receptacle with little or no resistance so that the stilt is initially adjustable for height before being adjusted to have a predetermined yield resistance.
A portion of the receptacle may have located within it a pair of oppositely disposed channel elements, each of said channel elements being provided with a pair of fixed spindles and with a movable spindle located in a slot midway between the fixed spindles, means being provided for adjusting said movable spindles in their respective slots, the arrangement being such that when the stilt is in use a pair of arms of the at least one bendable member accommodated in the receptacle and serving as a cradle for the lower end or the leg of the mine roof support are caused to extend in sinuous fashion between the spindles of the respective channel elements, that is to say they extend upwardly from a lower end portion which extends across the underside of the leg of the mine roof support, around the outside surfaces of the respective fixed spindles and around the inside surfaces of the respective movable spindles, said pair of arms of said at least one bendable member being caused to flex in sinuous fashion as the leg of the mine roof support moves downwards within the receptacle. In this case, the means which are provided for adjusting the movable spindles in their respective slots in the oppositely disposed channel elements may be constituted by respective screws.
The arrangement may be such that when the stilt is in use, the pair of arms of the at least one bendable member accommodated in the receptacle and serving as a cradle for the lower end of the leg of the mine roof support extend upwardly from the lower end portion which extends across the underside of said leg and pass around the uppermost of the fixed spindles before extending downwardly between the respective groups of spindles, the arrangement being such that the leg of the mine roof support is permitted to move downwardly within the receptacle element by the flexing of the arms of the bendable member in sinuous fashion as they pass between the respective groups of spindles and also by their further flexing as they pass around the uppermost spindles.
The receptacle element may be constituted by a length of upstanding channel section, the pair of channel elements located within it being respectively secured to the opposite side walls of said channel section. On the other hand, the receptacle element may be constituted by a length of upstanding channel section at least an upper end length of which has an attached side piece which closes the channel, the pair of channel elements located within said receptacle element being secured respectively to the inside basal surface of said upstanding channel section and to the inside surface of the attached side piece.
In a different construction, a portion of the receptacle may have located within it a pair of oppositely disposed channel elements, the opposed flanges of said channel elements constituting bendable members which, in association with a displaceable loading assembly, serve as a cradle for the lower end of the leg of the mine roof support.In this case, the displaceable loading assembly may include a bolt which extends transversely of the stilt across a gap which separates the opposed flanges of the pair of oppositely disposed channel elements, an arrangement of rod elements welded to a washer located beneath the head of the bolt at one side of the stilt, and to a washer located beneath a nut engaging the bolt at the other side of the stilt, and to a bobbin element located on the bolt within a central space between the pairs of flanges, constituting means whereby the opposed flanges of the channel elements are caused to flex in sinuous fashion as the leg of the mine roof support moves downwards within the receptacle.
In yet a further construction, the receptacle element may be constituted by a pair of channel section elements arranged to embrace the lower end of the leg of a mine roof support, the opposed flanges of said channel section elements constituting bendable members which, in association with a displaceable loading assembly, serve as a cradle for the lower end of the leg of the mine roof support.In this case, the displaceable loading assembly may include a bolt which extends transversely of the stilt across a gap which separates the opposed flanges of the pair of channel section elements arranged to embrace the lower end of the leg of a mine roof support, an arrangement of rod elements welded to a washer located beneath the head of the bolt at one side of the stilt, and to a washer located beneath a nut engaging the bolt at the other side of the stilt, and to a bobbin element located on the bolt within a central space between the pair of channel section elements, constituting means whereby the opposed flanges of the channel section elements are caused to flex in sinuous fashion as the leg of the mine roof support moves downwards between said channel section elements.
In orderthatthe invention may be fully understood and readily carried into effect, the same will now be described, by way of example only, with reference to the accompanying drawings, of which: Figure 1 is a part-sectional side view of a yieldable stilt embodying the invention,
Figure 2 is a plan view thereof,
Figure 3 is a view similarto Figure 1 and illustrating a first possible modification,
Figure 4 is a view similarto Figure 1 and illustrating a second possible modification,
Figure 5 is a plan view thereof,
Figure 6 is a view similar to Figure 1 and illustrating a third possible modification,
Figure 7 is a sectional view on the line 7-7 in
Figure 6,
Figure 8 is a plan view,
Figure 9 is a view similar to Figure 8 which illustrates a further possible modification, and
Figure 10 is a diagrammatic view which illustrates how a yieldable stilt as illustrated in Figures 6 to 8 or
Figure 9 can be adjusted so that it will yield at a predetermined load.
Referring now to Figures 1 and 2 of the drawings, the yieldable stilt there illustrated includes a receptacle element 10 of upstanding channel section, the receptacle being arranged to receive the lower end of the leg of a mine roof support shown in chain-dotted lines. An upper portion of the channel section which constitutes the receptacle has located within it a pair of oppositely disposed smaller section channel elements 12,12 these being bolted in position by respective bolts 14. Each of the channel elements 12, 12 is provided with a pair of fixed spindles 16, 16 and with a movable spindle 18 located in a slot 20 midway between the fixed spindles as shown. Respective screws 22 which engage threaded holes in the channel elements 12, 12 act against the movable spindles and can be used to adjust the positions of said spindles in their respective slots.
The stilt also includes a bendable member, constituted by a length of ductile steel strip 24, which serves as a cradle for the lower end of the leg of the mine roof support, as shown in Figure 1. The bendable member has a pair of arms which extend upwardly from a lower end portion which extends across the underside of the web of the R.S.J. section of the leg of the mine roof support, the arms extending upwardly around the outside surfaces of the fixed spindles 16, 16 and around the inside surfaces of the movable spindles 18.The arrangement is such that, in use of the stilt with the movable spindles located substantially midway along their respective slots, as shown, the arms of the bendable member are each caused to flex in sinuous fashion as they pass between the respective groups of three spindles to permit the leg of the mine roof support to move downwardly within the receptacle element at a controlled rate. It will be understood that the yield resistance of the stilt can be increased by adjusting the screws 22 so that the two movable spindles are displaced mutually towards each other and cause the arms of the bendable member to be more severely flexed as the leg of the mine roof support moves downwardly within the receptacle element.Conversely, the yield resistance can be reduced by adjusting the screws 22 so that the two movable spindles are able to move further apart, and in fact if the screws are backed off fully the arms of the bendable member are able to slide between the groups of spindles with little or no resistance so that the stilt is initially adjustable for height before being adjusted to have a predetermined yield resistance.
Referring now to Figure 3, the yieldable stilt there illustrated is basically the same as that illustrated in
Figures 1 and 2 except that in this case the bendable member, again constituted buy a length of ductile steel strip, is of a somewhat different form, that is to say having a pair of arms which extend upwardly from a portion which extends across the underside of the web of the R.S.J. section of the leg of the mine roof support, but in close contact with the opposite side surfaces of the web, and then pass around the uppermost of the fixed spindles 16, 16 before extending downwardly between the respective groups of spindles.The arrangement is such that the leg of the mine roof support concerned is only permitted to move downwardly within the receptacle element by the flexing of the arms of the bendable member as they pass between the respective groups of spindles and also by their further flexing as they pass around the uppermost spindles 16,16. Consequently, although it is again possible to adjust the stilt so that it has a predetermined degree of yield resistance, the maximum yield resistance will be considerably greater than is possible in the first described embodiment (that is of course assuming that the steel strip 24 of which the bendable member is made is of the same thickness and width as before and that its ductility is the same).On the other hand it will be understood that in this case it is not possible to effect a height adjustment at zero yield resistance before adjusting the yield resistance to a predetermined amount.
In Figures 4 and 5 there is illustrated a second possible modification basically similar to the first possible modification just described except that in this case the receptacle element 10 has a detachable side piece 26 at its upper end and the smaller section channel elements are differently disposed within the upstanding channel section of the receptacle element, being secured respectively to the inside basal surface of said upstanding channel section and to the inside surface of the side piece 26.
The stilt is designed to operate in the same way as the stilt illustrated in Figure 3 and can be adjusted to have a predetermined degree of yield resistance.
Referring now to Figures 6,7 and 8, the third possible modification there illustrated differs substantially in its construction from the previously described constructions, although working on the same basic principle. The stilt in this case again includes a receptacle element 10 of upstanding channel section, the receptacle being arranged to receive the lower end of the leg of a mine roof support shown in chain-dotted lines. However, in this case, the opposed flanges 28 of the smaller section channel elements 12, 12 located within the receptacle element 10 themselves constitute bendable members which, in association with a displaceable loading assembly, generally indicated 30, serve as a cradle for the lower end of the leg of the mine roof support as shown in chain-dotted lines.
The displaceable loading assembly 30 includes a bolt 32 which extends transversely of the stilt across the gap which separates the opposed flanges of the elements 12, 12. A washer 34 which is located beneath the head of the bolt has welded to it a pair of aligned rod elements 36 which are arranged to act against the outer surfaces of the flanges of the channel elements 12, 12 at one side of the stilt. At the other side of the stilt, a washer 38 beneath a nut 40 has welded to it a similar pair of aligned rod elements 42 which are arranged to act against the outer surfaces of the other flanges of the channel elements 12,12.Located on the bolt within a central space between the pairs of flanges is a bobbin element 44 at the opposite ends of which are welded spaced pairs of rod elements 46 which are arranged to act against the inner surfaces of the flanges, as shown. The arrangement is such that, in use of the stilt, with the displaceable loading assembly adjusted as shown in Figure 7, the flanges of the channel elements 12, 12 are caused to flex in sinuous fashion as the displaceable loading assembly is displaced downwardly by the lower end of the leg of the mine roof support which rests on it.
Consequently, depending on the adjustment of the displaceable loading assembly, that is to say on the degree of bending which is imposed on the flanges of the channel elements 12, 12 by the staggered rod elements 36,42 and 46, the mine roof support is permitted to move downwardly within the receptacle at a controlled rate. The yield resistance of the stilt can be increased by tightening the nut 40 on the bolt 32 to increase the flexing of the flanges of the channel elements 12,12. Conversely, the yield resistance can be reduced by slackening the nut 40 and it will be understood that if the nut is slackened sufficiently the displaceable loading assembly will be able to slide down the gap between the channel elements 12, 12 with little or no resistance to movement.Consequently, the stilt can be initially adjustable for height before being adjusted to have a predetermined yield resistance.
In Figure 9 there is illustrated a further modification, this being an arrangement very similar to that illustrated in Figures 6 to 8 except that in this case the channel section elements 12, 12 are arranged to embrace the lower end of the leg of a mine roof support shown in chain-dotted lines.
Consequently, in this case the channel section elements 12, 12 themselves constitute the upstanding receptacle element, and the lower ends of said channel section elements are suitably connected together (conveniently by being welded to a base plate not shown) and their upper ends are connected together by means of a metal band surrounding their upper ends. However, the stilt is arranged to operate in the same general way as the stilt illustrated in Figures 6 to 8.
Referring now to Figure 10, this illustrates how a yieldable stilt as illustrated in Figures 4 and 5 or
Figures 6 to 8 or Figure 9 can be adjusted to have a predetermined degree of yield resistance. In the drawing it will be seen that a stout bar has been passed through the gap between the channel section elements 12, 12 and a pair of hydraulic rams have been brought to bear beneath the opposite ends ofthe bar. In a mine, the hydraulic rams can be powered by a hand pump and a pressure gauge can be used so that a total compressive load on the stilt can be determined. With the stilt initially adjusted to have considerable yield resistance, the adjustment means can then be gradually backed off until the stilt starts to yield at which point it will be known that the adjusted yield resistance is the total compressive load being applied by the hydraulic rams. It will be understood that, if such an adjustment is to be carried out in a mine, the stilt can be engaged with a mine roof support for the jacking action to react against the mine roof.
However, if the adjustment is to be carried out in a workshop, the loading of the stilt may be carried out in a fixed frame arrangement using a pair of hydraulic rams in the manner illustrated in Figure 10, or alternatively can be carried out quite simply in a hydraulic press, a dummy section of mine roof support leg being used in either case to apply the compressive load to the bendable member of the stilt.
It is however possible that an adequate adjustment of the yield resistance might be carried out by the use of a torque wrench on the means provided for adjusting the degree of flexing of the or each bendable member.
Various other modifications may be made. For example, it will be understood that at least some of the spindles or rod elements by means of which the or each bendable member is caused to flex may be fitted with or replaced by freely rotatable rollers. The receptacle may be fitted with a base plate.
It will be understood that in every case, the or each bendable member will be returned to its flat condition after having passed through the means for flexing it; consequently the bendable member is ready for immediate re-use when the stilt is
Claims (12)
1. A yieldable stilt for a mine roof support, the stilt including a receptacle element arranged to receive the lower end of the leg of the mine roof support, and at least one bendable member accommodated in the receptacle and serving as a cradle for the lower end of the leg, the or each bendable member being caused to flex in sinuous fashion as the leg of the mine roof support moves downwards within the receptacle, means being provided whereby the degree of flexing is adjusted so that the yield resistance is adjusted in a stepless manner.
2. A yieldable stilt according to claim 1, in which the arrangement is such that the degree of flexing can be reduced to such an extent that the leg of the mine roof support is caused to move downwards within the receptacle with little or no resistance so that the stilt is initially adjustable for height before being adjusted to have a predetermined yield resistance.
3. A yieldable stilt according to either one of the preceding claims, in which a portion of the receptacle has located within it a pair of oppositely disposed channel elements, each of said channel elements being provided with a pair of fixed spindles and with a movable spindle located in a slot midway between the fixed spindles, means being provided for adjusting said movable spindles in their respective slots, the arrangement being such that when the stilt is in use a pair of arms of the at least one bendable member accommodated in the receptacle and serving as a cradle for the lower end of the leg of the mine roof support are caused to extend in sinuous fashion between the spindles of the respective channel elements, that is to say they extend upwardly from a lower end portion which extends across the underside of the leg of the mine roof support, around the outside surfaces of the respective fixed spindles and around the inside surfaces of the respective movable spindles, said
pair of arms of said at least one bendable member being caused to flex in sinuous fashion as the leg of the mine roof support moves downwards within the receptacle.
4. Ayieldable stilt according to claim 3, in which the means which are provided for adjusting the movable spindles in their respective slots in the oppositely disposed channel elements are constituted by respective screws.
5. A yieldable stilt according to either one of claims 3 and 4, in which the arrangement is such that when the stilt is in use the pair of arms of the at least one bendable member accommodated in the receptacle and serving as a cradle for the lower end of the leg of the mine roof support extend upwardly from the lower end portion which extends across the underside of said leg and pass around the uppermost of the fixed spindles before extending downwardly between the respective groups of spindles, the arrangement being such that the leg of the mine roof support is permitted to move downwardly within the receptacle element by the flexing of the arms of the bendable member in sinuous fashion as they pass between the respective groups of spindles and also by their further flexing as they pass around the uppermost spindles.
6. A yieldable stilt according to any one of claims 3 to 5 in which the receptacle element is constituted by a length of upstanding channel section, the pair of channel elements located within it being respectively secured to the opposite side walls of said channel section.
7. A yieldable stilt according to any one of claims 3 to 5, in which the receptacle element is constituted by a length of upstanding channel section at least an upper end length of which has an attached side piece which closes the channel, the pair of channel elements located within said receptacle element being secured respectively to the inside basal surface of said upstanding channel section and to the inside surface of the attached side piece.
8. A yieldable stilt according to either one of claims 1 and 2, in which a portion of the receptacle has located within it a pair of oppositely disposed channel elements, the opposed flanges of said channel elements constituting bendable members which, in association with a displaceable loading assembly, serve as a cradle for the lower end of the leg of the mine roof support.
9. A yieldable stilt according to claim 8, in which the displaceable loading assembly includes a bolt which extends transversely of the stilt across a gap which separates the opposed flanges of the pair of oppositely disposed channel elements, an arrangement of rod elements welded to a washer located beneath the head of the bolt at one side of the stilt, and to a washer located beneath a nut engaging the bolt at the other side of the stilt, and to a bobbin element located on the bolt within a central space between the pairs of flanges, constituting means whereby the opposed flanges of the channel elements are caused to flex in sinuous fashion as the leg of the mine roof support moves downwards within the receptacle.
10. Ayieldable stilt according to either one of claims 1 and 2, in which the receptacle element is constituted by a pair of channel section elements arranged to embrace the lower end of the leg of a mine roof support, the opposed flanges of said channel section elements constituting bendable members which, in association with a displaceable loading assembly, serve as a cradle for the lower end of the leg of the mine roof support.
11. A yieldable stilt according to claim 10, in which the displaceable loading assembly includes a bolt which extends transversely of the stilt across a gap which separates the opposed flanges of the pair of channel section elements arranged to embrace the lower end of the leg of a mine roof support, an arrangement of rod elements welded to a washer located beneath the head of the bolt at one side of the stilt, and to a washer located beneath a nut engaging the bolt at the other side of the stilt, and to a bobbin element located on the bolt within a central space between the pair of channel section elements, constituting means whereby the opposed flanges of the channel section elements are caused to flex in sinuous fashion as the leg of the mine roof support moves downwards between said channel section elements.
12. A yieldable stilt for a mine roof support, the stilt being constructed, arranged and adapted to operate substantially as hereinbefore described with reference to and as illustrated by the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB838327039A GB8327039D0 (en) | 1983-10-10 | 1983-10-10 | Yieldable stilts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8423817D0 GB8423817D0 (en) | 1984-10-24 |
| GB2147636A true GB2147636A (en) | 1985-05-15 |
Family
ID=10549935
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB838327039A Pending GB8327039D0 (en) | 1983-10-10 | 1983-10-10 | Yieldable stilts |
| GB08423817A Withdrawn GB2147636A (en) | 1983-10-10 | 1984-09-20 | Yieldable stilts for mine roof supports |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB838327039A Pending GB8327039D0 (en) | 1983-10-10 | 1983-10-10 | Yieldable stilts |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8327039D0 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847071B (en) * | 2021-10-19 | 2024-04-16 | 安徽理工大学 | Adjustable pedal applied to coal mining hydraulic support |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1007591A (en) * | 1960-12-28 | 1965-10-13 | United Steel Companies Ltd | Improvements relating to yielding supports for mine arches |
| GB1007592A (en) * | 1960-12-28 | 1965-10-13 | United Steel Companies Ltd | Improvements relating to yielding supports for mine arches |
| GB1506581A (en) * | 1975-08-05 | 1978-04-05 | Gkn Sankey Ltd | Stilts for use in mine workings |
-
1983
- 1983-10-10 GB GB838327039A patent/GB8327039D0/en active Pending
-
1984
- 1984-09-20 GB GB08423817A patent/GB2147636A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1007591A (en) * | 1960-12-28 | 1965-10-13 | United Steel Companies Ltd | Improvements relating to yielding supports for mine arches |
| GB1007592A (en) * | 1960-12-28 | 1965-10-13 | United Steel Companies Ltd | Improvements relating to yielding supports for mine arches |
| GB1506581A (en) * | 1975-08-05 | 1978-04-05 | Gkn Sankey Ltd | Stilts for use in mine workings |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8423817D0 (en) | 1984-10-24 |
| GB8327039D0 (en) | 1983-11-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |