GB2107376A - Fluid supply for rotary cutter heads for mining machines and to mining machines comprising rotary cutter heads having fluid supply systems - Google Patents
Fluid supply for rotary cutter heads for mining machines and to mining machines comprising rotary cutter heads having fluid supply systems Download PDFInfo
- Publication number
- GB2107376A GB2107376A GB08228882A GB8228882A GB2107376A GB 2107376 A GB2107376 A GB 2107376A GB 08228882 A GB08228882 A GB 08228882A GB 8228882 A GB8228882 A GB 8228882A GB 2107376 A GB2107376 A GB 2107376A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cutter head
- machine
- fluid supply
- mining machine
- nozzles
- 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
- 239000012530 fluid Substances 0.000 title claims abstract description 37
- 238000005065 mining Methods 0.000 title claims abstract description 35
- 239000007921 spray Substances 0.000 claims abstract description 21
- 230000001939 inductive effect Effects 0.000 claims abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000000428 dust Substances 0.000 description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 239000011435 rock Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 208000036366 Sensation of pressure Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 210000001217 buttock Anatomy 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 210000003414 extremity Anatomy 0.000 description 1
- 210000002414 leg Anatomy 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- E21C35/22—Equipment for preventing the formation of, or for removal of, dust
- E21C35/23—Distribution of spraying-fluids in rotating cutter-heads
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)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
A fluid supply system for a rotary cutter head of mining machines comprises a plurality of nozzles (34) for directing air flow inducing sprays in the vicinity of the cutter head, and sensor means (101) for sensing a preselected operational condition of the fluid supply to the nozzles and for deriving a signal indicative of the sensed preselected conditions. <IMAGE>
Description
SPECIFICATION
Fluid supply system for rotary cutter heads for mining machines and to mining machines comprising rotary cutter heads having fluid supply systems
This invention relates to fluid supply systems for rotary cutter heads for mining machines and to mining machines comprising cutter heads having fluid supply systems.
Frequently, when a rotary cutter head of a mining machine is used to break rock or mineral associated with a coal seam there is a tendency for methane emitted from the broken material to concentrate around the cutter head because it is operating in a buttock shielded from the main ventilation air flow.
Such concentration of methane can be dangerous, especially if the concentration is within the explosive range, i.e. 5% to 15% by volume of methane. When the concentration of methane is within this range it is possible for a spark generated by a cutter tool striking an intrusion (or hard rock) in, below or above the working fact to ignite the methane which would give rise to an explosion.
It is known for a mining machine to have a rotary drive shaft provided with an axial bore and for a cutter head drivably mounted on the shaft to be provided with ventilator means comprising one or more water jets for directing air flow inducing sprays within the cutter head, the water jets being fed with pressurised fluid via a fluid supply system extending along the axial bore of the drive shaft. One problem associated with such a cutter head is that if one or more of the water jets becomes blocked or inoperative then the ventilating means tends not to operate efficiently and a potentially danerous build up of methane gas can occur in the vicinity of the rotating cutter head.
An object of the present invention is to provide a fluid supply system for a rotary cutter head which tends to overcome or reduce the above-mentioned problem.
According to the present invention a fluid supply system for a rotary cutter head of a mining machine comprises one or more nozzles for directing air flow inducing sprays into the vicinity of the cutter head and sensor means for sensing a preselected operational condition of the fluid supply to the one or more nozzles and for deriving a signal indicative of the sensed preselected condition.
Preferably, the derived signal is fed to processing means for controlling operation of the machine and/or for actuating alarm means.
The present invention also provides a mining machine comprising a rotary cutter head, one or more nozzles for directing air flow inducing sprays into the vicinity of the cutter head, and sensor means for sensing a preselected condition of the fluid supply to the one or more nozzles and for deriving a signal indicative of the sensed preselected condition.
Preferably, the derived signal is fed to processing means for controlling operation of the machine and/or for actuating alarm means.
Advantageously, the sensor means is adapted to sense the fluid flow to the nozzles.
Preferably, the sensor means is adapted to derive
a signal indicative of when the fluid flow reaches a
preselected critical value, the derived signal being
used to de-actuate the machine.
Conveniently, the sensor means is adapted to derive a signal indicative of when the fluid pressure
reaches a peselected critical value, the derived signal being used to de-actuate the machine.
By way of example one embodiment of the
present invention will be described with reference to the accompanying drawings in which:
Figure 1 is an incomplete partly sectional view taken through a rotary cutter head of a mining machine;
Figure 2 is an incomplete end view of a detail of
Figure 1 and;
Figure 3 is an incomplete sectional view taken through a hub portion of the rotary cutter head of
Figure 1 and shown on an enlarged scale.
The drawings show a rotary cutter head 1 of a well known shearer type coal winning mining machine 2 (only a portion of the cutting section of which is shown) which in use repeatedly traverses to and fro along a longwall face with the rotary cutter head winning coal from the working face. The coal is cut by a plurality of cutter tools (not shown) mounted around the periphery of the cutter head, the cutter tools being mounted in tool holders (not shown) carried on the radially outer extremities of a plurality of cut mineral loading vanes 4 extending helically around and axially along a generally frustro conical barrel component 5 fixedly mounted with respect to a hub assembly 6 drivably mounted on a drive shaft 7 extending from the cutting section of the mining machine. The cutting section may be constituted by a portion of machine body as indicated in Figure 1.
Alternatively, the cutting section may be constituted by a ranging arm pivotally mounted on the machine body.
As shown in Figure 1,the machine body is carried on an underframe 10 provided with legs 11 having shoes 12 for slidably engaging elongate rails 13 fixedly mounted on an armoured flexible conveyor 14 extending along the longwall face. The shoe 12 shown in Figure 1 rests on and is guided by the outer face of the conveyor which also supports a ramp plate 15.
The barrel component 5 also is provided with a generallyfrustro conical annular back plate 16 forming the working face side of the cutter head 1 and carrying a plurality of tool holders (not shown) for cutting tools (not shown).
The hub assembly 6 which is shown in detail in
Figure 3 comprises a wedge lock bush arrangement 17, 18 for drivably connecting the cutter head to the drive shaft 7. The inner bush element 17 is retained on the shaft by an end retaining plate 19 secured to the shaft by bolts 20 and having a lip overlapping the working face side of the inner bush element, the element being prevented from sliding further along the shaft by spacer members 21.
The relatively outer bush element 18 has a conical wedge surface which cooperates with the conical wedge surface presented by the inner bush element 17. Thus, the outer bush element is drivably con nected to the drive shaft via the inner bush element.
Afurther retaining plate 22 secured to the inner bush element by bolts 23 ensures the wedge assembly cannot accidently become disengaged.
The barrel component 5 is fixedly mounted on to the hub assembly 6 by two plates 25, 26 welded to cut outs in the outer bush assembly 18 and to the inwardly directed surface of the barrel component.
The plate 25 and outer bush element 18 have passages 27 for feeding dust suppression fluid (i.e., water) to the cutting zone of the cutter head as will be explained later in this specification.
The cutter head 1 comprises ventilating means including a plurality of tubular elements 30 angularly arranged around the rotational axis 31 of the drive shaft and hub assembly, the tubular elements being welded into cut outs provided in the plates 25 and 26 so as to form through passages extending from the working face side of the cutter head to the machine side of the cutter head. In the drawings the axes 32 of the tubular elements are arranged generally parallel to the of the hub assembly. However, in other embodiments the axes of at least some of the tubular elements are inclined relative to the hub assembly axis.In use, an airflow is induced to flow along the passages of the tubular elements by fluid sprays 33 emitted from nozzle means 34 provided on a distributor block 35 secured to the hub assembly by bolts (not shown), the axis of each spray 33 being inclined to the longitudinal axis of the passage defined by the associated tubular element 30.
The distributor block 35 comprises an annular channel 36 extending around the block to feed pressure fluid to the plurality of nozzles 34, the channel having an input passage 37 extending along a radially extending arm 38. The passage 37 is in hydraulic connection with a passage 39 provided by a rotatably mounted inner tube 40 extending along a through bore 41 formed in the drive shaft 7. The machine side of the rotatable tube 40, (i.e., the end remote from the distributor block) is sealably mounted in an adaptor unit 42 fixedly secured to the cutting section of the machine. Pressurised fluid is fed to the passage 39 via ports 43 and a flexible hose trailing behind the mining machine from a relatively high pressure source (not shown).
An outer tube 44 arranged around the inner tube 50 provides an annular passage 45 connecting feed ports 46 and passages 47 with a passage 48 which is provided in the aforementioned radially extending arm 38 and which hydraulially connects with the aforementioned passage 27 provided in the plate 25 and outer bush element 18 via a short interconnecting passage 49 provided in the retaining plate 22.
The feed ports 46 are in hydraulic connection with a source of relatively low pressure fluid via flexible trailing hose (not shown) arranged to trail behind the mining machine as it traverses along the face, the relatively low pressure fluid being fed along the passages 47, 45,48, 49 and 27 to spray nozzles (not shown) mounted on the loading vanes adjacent the cutting zone of the cutter head and directed towards the cutting tools. Alternatively, or in addition to the spray nozzles associated with the cutting zone, spray nozzles may be provided on the loading vanes or on the barrel component 5 and arranged to direct sprays along the passages for cut mineral defined by the loading vanes.These spray nozzles which are not shown in the accompanyng drawings may be of a type similar to those disclosed in our prior British patent specifications, Nos. 1,414,917 and 2,062,725.
The cutter head also includes airflow deflector means comprising an inclined annular guide plate 50 (see Figures 1 and 2) which is mounted on radially extending arms 51 (only one of which is shown) extending from a support hub 52 to define a plurality of elongate apertures 49 effectively extending all around the support hub. The support hub 52 is fixedly mounted on a mounting arrangement 53 for a loading cowl (only a small portion of the arm 54 of which is shown). In use, the loading cowl tends to retain cut rock or mineral within the pockets defined by the loading vanes and cooperates with the helical loading vanes to urge cut rock and mineral towards the conveyor 14. In use, the loading cowl is located adajacentto the rear of the cutter head as the mining machine traverses along the longwall face.Thus, when the machine reaches the end of a traverse and reverses its direction of motion it is necessary for the loading cowl to be swung approximately 1800 about the axis 31 of the drive shaft in order to be relocated at the opposite side of the cutter head. As the cowl is swung about the axis 31 the inclined deflector guide plate 50 which is fixedly mounted relative to the cowl also swings about the axis. However, as the apertures 49 provide an effectively continuous opening extending annularly all around the support hub 51 the condition of the opening effectively remains unchanged. A blanking plate 60 fixedly mounted relative to the cutting section of the mining machine blanks off the apertures 49 associated with the relative upper region of the deflector guide 50 (see
Figures 1 and 2).Figure 1 shows the blanking plate 60 slidably contacting the machine side end of the inclined plate 50 effectively closing the apertures 49 in the relative upper region to restrict airflow towards the machine in that region of the cutter head. However, where the blanking plate is not effective (as seen in the relative lower region of the inclined deflector guide shown in Figure 1) the apertures 49 are open and airflow towards the machine in this region is permitted. The purpose of this arrangement will be made clear later in the specification.
Figure 2 illustrates the extent of the area for which the blanking plate 60 is effective. In this particular example the relative upper region of the apertures 49 is closed for approximately 200 .
Such an arrangement ensures that in use when the loading cowl is swung about the axis 31 of the drive shaft, irrespective of the angular position of the cowl, the relative lower region of the apertures 49 is always open to permit air flow from the cutter head towards the machine, the relative upper region of the apertures 49 always remaining closed to airflow towards the mining machine.
In Figure 1 it can be seen that the inclined deflector guide 50 is located adjacent to the machine side end margin of the barrel component 5 and is arranged to project radially outwardly beyond the adjacent end portion of the barrel component to define an annular aperture 70. The angle of the deflector guide is preferably within the range of 5 to 45" from a line normal to the axis of rotation 31 of the drive shaft (i.e., as seen in Figure 1 from 5 to 45" from a substantially vertical plane).
Preferably, the inclined deflector guide 50 is arranged such that the minimum cross-sectional area of the aperture 70 defined between the barrel component and the inclined deflector guide is at least as great as the total minimum cross-sectional area of the passages defined by the tubular element 30.
In use, as the machine is traversing along the longwall face with the cutter head 1 winning rock or mineral from the working face, pressure fluid at a relatively low pressure is fed via ports 46 as previously explained to the spray nozzles provided on the cutter head to suppress dust generated by the cutting tools. Simultaneously, relatively high press ure fluid is supplied to ports 43 and hence via passages 39 and 37 and the channel 36 to the nozzles 34 associated with each of the tubular elements 30 such that airflow inducing sprays are directed along the passages defined by the tubular elements such that air flow within the barrel component 5 is induced to flow along a first path section in a general direction towards the machine side end of the cutter head, as indicated generally by arrows X in Figure 1.
The action of ventilating means 34,30 also induces airflow along a second path section radially ouside the barrel component 5 and in a general direction away from the mining machine side of the cutter head. The air flows along the second path section is indicated generally by arrow Y.
In the relative upper region of the cutter head the induced air flow flowing along the first path section and in a general direction towards the mining machine side of the cutter head is deflected by the combined effect of the blanking plate 60 and inclined deflection guide 50 such that the air flow flowing along the first path section in this region of the cutter head is urged towards the air flow flowing along the second path section and thereby a preselected portion of the air flow together with some water from the air flow inducing sprays tends to be recirculated within the cutter head.
In the relative lower region of the cutter head the induced air flow flowing along the first path section and in a general direction towards the mining
machine side of the cutter head is permitted to pass through the open apertures 49 to be discharged along a third path section indicated generally by
arrows Z from the cutter head into the main ventilation air flow along the longwall face.
The preselected portion of the airflow and associ
ated water from the air flow inducing sprays which is
recirculated within the cutter head is determined by the angular extent of the blanking plate 60 and the angle of inclination of the deflection guide 50. It will
be appreciated that the greater the angular extent of the blanking plate the greater is the portion of the air flow which is recirculated and vice versa.
The effect of recirculating the air flow tends to
reduce the nuisance condition of wet air being discharged into the working zone by the face operators. In addition, the water which is recirculated with the air flow tends to be mixed with the cut material momentarily being convexed within the pockets defined by the loading vanes 4 and thereby tends to wet the cut material. Thus, as the material is conveyed along the conveyor system including the conveyor 14 there tends to be reduced dust made especially as the wetted material is passed over transfer stations.
Any dust generated within the zone of the cutter head tends to be drawn along the second air flow path section around the working face side of the cutter head and into the air flow passages defined by the tubular elements 30 where it is efficiently wetted by the air flow inducing sprays 33 from the nozzles 34. The wetted dust is carried along the first air flow path section and is either deflected by the deflector means 50, 60 to be mixed with the cut material momentarily within the loading pockets or to be discharged towards the mining machine and conveyor 14though the open apertures 49 curently within the relative lower region of the cutter head.
Dust concentration within the cutting zone also tends to be reduced by the effect of the aforementioned sprays mounted on the loading vanes or on the barrel component.
Any methane produced within the cutting zone tends to be drawn with the induced airflow to be discharged in a diluted state through the same open apertures 49 currently within the relative lower region of the cutter head or recirculated by the plate 60 in the upper region.
The present invention provides an improved cutter head which tends to reduce or control dust concentrations occurring within the cutting zone to an acceptably low level, the amount of water used being maintained within an acceptably low volume.
Also, methane concentrations in the vicinity of the cutting zone are controlled to within desirabie limits.
Figure 1 shows the cutter head to be provided with a gas and/or air flow sensor 100 arranged to sense a preselected state existing in the vicinity of the cutter head, as for example, the concentration of methane existing in the vicinity of the cutter head and to derive a signal indicative of the sensed concentration. The sensor may be mounted on the working face side of the tubular elements 30 (as indicated).
Alternatively, or in addition to, one or more sensors may be mounted on the machine side of the tubular elements 30. It is probable that sensors mounted on the working face side of the tubular elements will sense the methane concentration and that sensors mounted on the machine side ofthetubularele- ments will sense air flow conditions, the latter sensor arranged to sense air flow volume and/or pressure. The derived signal is fed along cables (not shown) to processor means (not shown) mounted either on the mining machine or on a control panel
mounted at the end of the working face remote from the machine. The processor means is arranged to
receive the derived signal and to switch off the
power supply to the mining machine should the sensed gas concentration reach or approach a
preselected critical value.Alternatively, or in addi tion to, the processor means activates an alrm should the sensed gas concentration reach or approach a preselected critical value.
An airflow sensor would be arranged to sense the flow rate of the air flow and would be adapted to derive a signal indicative of the sensed flow rate. The sensor may sense the flow rate by detecting the pressure of the air flow and in which case the sensor would be adapted to derive a signal indicative of the sensed pressure.
Turning now to Figure 3, the broken lines adjacent the right-hand side of the drawing indicate a fluid flow sensor arrangement 101 which is built into the relatively high pressure water supply to the nozzles 34 in the distributor block 35 and which is adapted to sense a preselected operational condition of the water supply to the nozzles 34. the arrangement comprises a fluid flow and/or fluid pressure sensor unit 102 fed with relatively high pressure water through a connector pipe 103 which in turn is
connected to the aforementioned relatively high
pressure source via a flexible trailing hose. The
output of the flow sensor unit 102 is connected via
connectors 104 to the two inlet ports 43 of the
previously described relatively high pressure water
system within the cutter head.
The sensor unit 102 is adapted to sense the flow of water to the relatively high pressure system and to
derive a signal indicative of the flow. The derived
signal is fed to a processor unit 140 including alarm
means 141 and arranged to receive the signal and to de-activatethe machine by switching off the power
supply to the mining machine should the sensed
flow fall below a preselected volume. Alternatively,
or in addition to the flow sensor, the sensor unit may
include a fluid pressure sensor arranged to sense the
fluid pressure supply and to derive a signal of
pressure supply. The signal de-activating the
machine if the pressure reaches a preselected critical
value.Thus in operation should any one of the
nozzles 34 become blocked or inoperative for any
reason the flow sensor unit 102 senses the resultant
reduction in water flow, the derived signal is carried
accordingly and the processor means actuates con
trol means to switch off the machine. Such an
arrangement tends to ensure that if any of the
nozzles 34 does become blocked or inoperative such
that no air flow inducing spray is directed along the
passage of the associated tubular element 30, then
the machine is halted. Such an arrangement ma be
considered necessary when working in conditions
where no recirculation of air flow within the barrel
component can be tolerated or where only a pre
selected amount of recirculation can be tolerated. It
will be understood that should any one of the sprays
become blocked or inoperative than an air flow
might be urged to flow along the passage of the
associated tubular element in a reverse direction,
i.e., away from the mining machine side of the cutter
head and towards the working face side of the cutter
head. Thus, recirculation of air flow would tend to
take place within the barrel component and a
resultant excessive build up in methane concentra
tion within the cutting zone could occur. However,
by providing the flow sensor arrangement including the unit 102 such a potentially dangerous condition would tend to be avoided.
In other embodiments the unit 102 is adapted to activate an alarm if the water flow falls below a preselected volume.
Claims (9)
1. A fluid supply system for a rotary cutter head of a mining machine, comprising one or more nozzles for directing airflow inducing sprays into the vicinity of the cutter head and sensor means for sensing a preselected operational condition ofthe fluid supply to theone or more nozzles and for deriving a signal indicative of the sensed preselected condition.
2. A system asclaimed in claim 1, in which the derived signal is fez to processing means for controlling operation of the machine and/or lgr actuating alarm means. t
3. A mining machine comprising a rotary cutter head, one or more nozzles for directing air flow inducing sprays into the vicinity of the cutter head, and sensor means for sensing a preselected condition of the fluid supply to the one or more nozzles and for deriving a signal indicative of the sensed preselected condition.
4. A mining machine as claimed in claim 3, in which the derived signal is fed to processing means for controlling operation of the machine and/or for actuating alarm means.
5. A mining machine as claimed in claim 4, in which the sensor means is adapted to sense the fluid flow and/or pressure to the nozzles.
6. A mining machine as claimed in claim 5, in which the sensor means is adapted to derive a signal indicative of when the fluid flow reaches a preselected critical value, the derived signal being used to de-actuate the machine.
7. A mining machine as claimed in claim 4 ot 6, in which the sensor means is adapted to derive a signal indicative of when the fluid pressure reaches a preselected critical value, the derived signal being used to de-actuate the machine.
8. Afluid supply system for a rotary cutter head of a mining machine, substantially as described
herein and substantially as shown in the accompanying drawings.
9. A mining machine comprising a fluid supply system; substantially as described herein and substantially as shown in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08228882A GB2107376B (en) | 1981-10-13 | 1982-10-08 | Fluid supply for rotary cutter heads for mining machines and to mining machines comprising rotary cutter heads having fluid supply systems |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8130809 | 1981-10-13 | ||
| GB08228882A GB2107376B (en) | 1981-10-13 | 1982-10-08 | Fluid supply for rotary cutter heads for mining machines and to mining machines comprising rotary cutter heads having fluid supply systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2107376A true GB2107376A (en) | 1983-04-27 |
| GB2107376B GB2107376B (en) | 1985-01-30 |
Family
ID=26280952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08228882A Expired GB2107376B (en) | 1981-10-13 | 1982-10-08 | Fluid supply for rotary cutter heads for mining machines and to mining machines comprising rotary cutter heads having fluid supply systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2107376B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2129035A (en) * | 1982-10-22 | 1984-05-10 | Pitcraft Summit Ltd | Mineral cutting machine |
| GB2149467A (en) * | 1983-10-03 | 1985-06-12 | Cyril Xavier Latty | Rotating joint-coal cutting machines |
-
1982
- 1982-10-08 GB GB08228882A patent/GB2107376B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2129035A (en) * | 1982-10-22 | 1984-05-10 | Pitcraft Summit Ltd | Mineral cutting machine |
| GB2149467A (en) * | 1983-10-03 | 1985-06-12 | Cyril Xavier Latty | Rotating joint-coal cutting machines |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2107376B (en) | 1985-01-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |