GB747266A - Improvements in and relating to pit props - Google Patents
Improvements in and relating to pit propsInfo
- Publication number
- GB747266A GB747266A GB16747/53A GB1674753A GB747266A GB 747266 A GB747266 A GB 747266A GB 16747/53 A GB16747/53 A GB 16747/53A GB 1674753 A GB1674753 A GB 1674753A GB 747266 A GB747266 A GB 747266A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prop
- cylinder
- clamp
- base
- detent
- 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.)
- Expired
Links
- 230000000717 retained effect Effects 0.000 abstract 2
- 239000000872 buffer Substances 0.000 abstract 1
- 230000003993 interaction Effects 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 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
- E21D15/58—Devices for setting props or chocks
- E21D15/581—Devices for setting props or chocks in which the props are pre- loaded
- E21D15/5813—Devices for setting props or chocks in which the props are pre- loaded by means of power accumulators to be pre-charged by rock 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)
- Working Measures On Existing Buildindgs (AREA)
Abstract
747,266. Pit props. GUTEHOFFNUNGSHUTTE STERKRADE AKT.-GES., [formerly GUTEHOFFNUNGSHUTTE OBERHAUSEN AKT.-GES.]. June 17, 1953 [March 2, 1953], No. 16747/53. Class 20(2). A telescopic pit prop has energy storing means which is energised when the prop telescopes under load, the energy-storing means being prevented, by a releasable locking device, from parting entirely with its energy during the dismantling of the prop. In one form the inner prop member 2, Fig. 1, has a cylinder 10 at its lower end engaging over a base plunger 8, and at its upper end a piston 6 engaging within a cylinder 5 carried by the outer prop part 1. The prop parts may be frictionally gripped by a clamp actuated by a lever 3. With the prop parts clamped together and the prop in operative position, subsidence of the roof compresses the air in the cylinder 10, a detent 11 wiping over a stop on the plunger 8. Dismantling is effected by actuation of the clamp lever 3 to release the clamp, whereupon the prop member 2 rises under the high pressure in the cylinder 10, to compress air in the cylinder 5, to a low pressure. Shock occurring at the arrest of upward movement by interaction of the detent 11 and stop, jumps the base 12 free of debris and allows the prop to be withdrawn by an attached rope. The clamp is reapplied immediately after the base has jumped in order to retain the air at low pressure in the cylinder 5. When the prop is repositioned, the clamp is released to allow the low pressure air in cylinder 5 to move the prop head 14 into contact with the roof, whereupon the clamp is reapplied and detent 11 disengaged to allow the high pressure air in cylinder 10 to apply initial loading to the roof. The prop head 14 may be adjusted by a wedge 13. The prop head and/or base 12 may be resiliently connected to their respective prop members e.g. as shown by Fig. 2, a pawl 16 retaining the head or base in pre-loaded condition. Springs or rubber buffers may be employed as the resilient members, and the cylinder and plunger devices at the prop ends may be replaced by chambers 5 or 10 having corrugated walls which are expansible under pressure. The energy storing device may alternatively be provided in a separate base which may be removed from the prop and associated with any other prop. In another embodiment, the prop is spring loaded, Fig. 4 and clamped by a wedge 28 controlled by a wedge 34, which may be retained in inoperative position, by a catch 32 and interengaging stop 29, against spring pressure 30. The subsidence of the roof compresses the spring 20, the energy being retained by interengagement of the stop 24 and detent 16.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE747266X | 1953-03-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB747266A true GB747266A (en) | 1956-03-28 |
Family
ID=6648592
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16747/53A Expired GB747266A (en) | 1953-03-02 | 1953-06-17 | Improvements in and relating to pit props |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB747266A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2000227A (en) * | 1977-06-10 | 1979-01-04 | Jungheinrich Kg | Hydraulic lifting device |
US4167361A (en) * | 1978-08-30 | 1979-09-11 | Mine Safety Appliances Company | Temporary mine roof prop |
WO2011101716A3 (en) * | 2010-02-19 | 2012-06-14 | Council Of Scientific And Industrial Research | A device for roof support of underground mine/tunnel |
-
1953
- 1953-06-17 GB GB16747/53A patent/GB747266A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2000227A (en) * | 1977-06-10 | 1979-01-04 | Jungheinrich Kg | Hydraulic lifting device |
GB2000227B (en) * | 1977-06-10 | 1982-02-24 | Jungheinrich Kg | Hydraulic lifting device |
US4167361A (en) * | 1978-08-30 | 1979-09-11 | Mine Safety Appliances Company | Temporary mine roof prop |
WO2011101716A3 (en) * | 2010-02-19 | 2012-06-14 | Council Of Scientific And Industrial Research | A device for roof support of underground mine/tunnel |
CN102844523A (en) * | 2010-02-19 | 2012-12-26 | 科学与工业研究会 | A device for roof support of underground mine/tunnel |
CN102844523B (en) * | 2010-02-19 | 2014-09-24 | 科学与工业研究会 | A device for roof support of underground mine/tunnel |
US9267375B2 (en) | 2010-02-19 | 2016-02-23 | Council Of Scientific & Industrial Research | Device for roof support of underground mine/tunnel |
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