US3145964A - Hydraulic mine prop - Google Patents

Hydraulic mine prop Download PDF

Info

Publication number
US3145964A
US3145964A US279168A US27916863A US3145964A US 3145964 A US3145964 A US 3145964A US 279168 A US279168 A US 279168A US 27916863 A US27916863 A US 27916863A US 3145964 A US3145964 A US 3145964A
Authority
US
United States
Prior art keywords
prop
piston
pressure
assembly
hydraulic
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 - Lifetime
Application number
US279168A
Other languages
English (en)
Inventor
Groetschel Karl Maria
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3145964A publication Critical patent/US3145964A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props

Definitions

  • HYDRAULIC MINE PROP Filed May 9, 1965 PRESSURE MEDIUM SUPPLY MEA NS Irl .lllh mW-h nowadays y mvElvroR Karl Mario Groetschel ATTORNEYS United States Patent O 3,145,964 HYDRAULC MINE PROP Karl Maria Groetsehel, Stolzestrasse 44, Bochum, Westphalia, Germany Filed May 9, 1963, Ser. No. 279,168 Claims priority, application Germany May 12, 1962 12 Claims. (Cl.
  • the present invention relates generally to mine props, and, more particularly, to a device for increasing the setting force of hydraulic mine props with respect to the setting force imparted to the props ⁇ by means of a pressure medium acting upon the piston area of the prop.
  • Hydraulic props comprising inner and outer prop sections which are used for the continuously substituted or travelling support of the face of the mine or the mine working area are usually set in place with a setting force which is determined by the supply pressure of the hydraulic medium.
  • Such props have high pressure relief valves which are set to the pressure of the roof of the mine which is normally of the magnitude of about 750 atmospheres.
  • a pressure in the supply system for the hydraulic pressure medium of, for example, 100 atmospheres
  • when setting the props with a normal force or load of the prop being 30 tons, such a small setting force is provided that only a fraction of the bearing capabilities of the prop are utilized in this phase of the operation.
  • Another object of this invention is to provide a device of the type described which is so constructed that the increase in the setting -force may occur at any desired instant and thus not necessarily immediately after setting the prop with its normal setting force, but at any subsequent time which may be chosen depending upon the condition of the roof.
  • a further object of the invention is to provide a device of the character described wherein the increase in the setting force can be made effective in a diiferentiated manner.
  • Still another object of the invention is to provide an arrangement wherein the setting load of mine props may be increased, and the increase may be determined previously and may be controlled when applied.
  • Still a further object of the invention is to provide a hydraulic prop having the above-mentioned features for increasing the setting force, but which is nevertheless capable of being exchanged and moved from location to ice location and set up within a location as simply and quickly as a prop which does not incorporate such a device.
  • Yet another object of the present invention is to provide a hydraulic prop having a device for increasing the setting force thereof and which does not substantially limit the extensibility or length of telescoping of the prop.
  • Yet a further object of the invention is to provide a prop having a device for increasing the setting force thereof which does not cause an increase in the stroke length of the prop when it is temporarily removed, since such an increase would impair the ability of the prop to be immediately reused in the face area of the mine at that particular time.
  • a hydraulic pressure assembly which encloses one end of the prop with which it is to be used and which is itself independent and of a short stroke in comparison with the stroke of the prop.
  • This pressure assembly has a piston which directly carries the prop and the piston area of the pressure assembly is substanftially larger, and at least twice as large as the piston area of the prop.
  • the piston at its unstressed side has the configuration of a housing or receptacle and it encloses the prop end which is inserted into the hollow space thereof.
  • This pressure assembly is preferably arranged coaxially with the prop.
  • the prop and the additional pressure assembly have force applied thereto by the same source of pressure medium.
  • the pressure assembly would be provided at ythe bottom end of the prop.
  • the inner bottom surface of the piston which is lfashioned as in the first embodiment as a receptacle, is preferably provided with a downwardly extending projection.
  • This projection together with a corresponding recess in the prop head of the otherwise normally constructed prop, and which is easily and quickly interchangeable at any time, forms a joint which permits a limited and relatively universal pivotal movement of the parts with respect to each other. In both arrangements the prop can be easily exchanged.
  • a prop which includes an inner prop section 1, which forms the piston, and an outer prop section 2 forming the cylinder of a normal hydraulic prop with telescoping sections.
  • the lower end or foot 3 of the outer prop section 2 is inserted into a receptacle-like or pot-shaped chamber 4 of a piston 4 of the pressure increase assembly and this piston 4 thus encloses the foot 3.
  • the piston 4 encloses foot 3 of the outer prop section 2, the foot is spaced from the inner surfaces of piston 4 by a predetermined spacing which is lled with resilient intermediate layers 5 which prevent the prop from pivoting laterally.
  • the pressure increase assembly includes a cylinder 6 in which the piston 4 is guidably moved and this piston is provided with an upper stop or abutting ring 12 for limiting the stroke of piston 4.
  • a layer 11, similar tolayer 5, is disposed on ring 12 and at the top of cylinder 6.
  • a connection conduit 8 is provided as the inlet and outlet for the pressure medium and inthe illustrated pre-Y ferred embodiment, the opening is connected via conduit 8b with the supply pipe 8a for the pressure medium which normally serves via conduit 8c for providing pressure medium to the prop and so no extra line is needed for the extra assembly. Under certain circumstances, the opening can also be connected with a special feed pipe for a medium which is at a higher pressure than that of the normal hydraulic system for the prop.
  • the effective surface of the piston 4 is substantially larger than the effective area of the piston formed by the lowersurface of inner prop 1.
  • the pressure increase assembly is provided at the head or at the foot of the prop whose setting force is to be increased.
  • the arrangement at the foot of the prop is illustrated and structure is also shown for forming a pressure increase assembly at the head.
  • the assembly which is provided at the head is basically the same as that described above, and it is placed at the top of the inner prop section.
  • This assembly comprises a pressure cylinder 17 having an inlet and outlet opening 16 and a piston 19 which is arranged in the form of a receptacle.
  • the inner bottom surface of this piston is provided with a downwardly extending projection 22 which engages a recess at the top surface of the prop head and thus, together with the recess forms a joint.
  • a stop ledge or flange 18 is provided in cylinder 17 in order to limit the stroke of the piston.
  • the intermediate space between the periphery of the inner prop section and the inner surface of piston 19 may be, and preferably is, filled with resilient filler elements 5'.
  • the pressure increase assembly in which the outer prop section is disposed is provided with a further feature of the invention by arranging the cylinder body 6 of the first assembly as the piston of a second assembly and inserting this cylinder body in a further pressure cylinder 25.
  • This cylinder 25 has an inlet and outlet opening 28.
  • Cylinder 25 also is provided with a stop 27a for limiting the stroke of the piston 6. This stop cooperates with a counter stop 27 provided in the form of a ring on a cylindrical extension sleeve 26 or the like attached to the cylinder 25.
  • the operation is as follows: First the prop which is provided with the pressure assembly is fully extended and the setting operation is performed as is done with a normal hydraulic prop and with its own relatively low setting force by applying pressure between the prop sections 1 and 2, acting as a cylinder and piston. This may be done by admitting the pressure medium from supply line 8a to line 8c via cock 30.
  • the prop is provided with the desired setting load or force by placing the pot-shaped piston of the pressure assembly under pressure preferably by means of a normal pressure medium supply through the use of the three-Way cock 30 and line 8b, and the pressure of the prop against the roof is increased in correspondence with the relationship of the effective area of the piston of the additional assembly with respect to the area of the end of the prop piston proper.
  • the cock 30 admits pressure medium to line 28' to thus operate the piston 6.
  • the upper pressure increase assembly may be operated. If the upper and lower assemblies are to be used together, suitable connections can be added for supplying pressure to the upper cylinder.
  • the piston and cylinder arrangements shown have cylinders open to the atmosphere so that only a single pressure medium connection for each cylinder is needed. The weight of the apparatus will be sufficient to retract the pistons once there is release of the pressure medium acting upon the pistons.
  • the new device makes it possible to increase the force, using a pressure of the hydraulic pressure medium of atmospheres and, for example, the setting force of 4 tons of a prop, which can normally be achieved.
  • a prop has a normal load of 30 tons, and the setting force can then be increased to 20 tons, if the size of the piston area of the additional pressure assembly is five times the size of the piston area of the prop. For example, if the prop piston has an area of 40 cm.2, the additional pressure assembly piston would have an area of 200 cm?.
  • a setting force of this magnitude could otherwise only be achieved by a corresponding increase of the prop diameter, and thus of the effective piston area of the prop itself, and vthis increase is not possible due to economic reasons and mine operation problems.
  • this new additional setting force increasing device provides special advantages at least for setting the forward prop and/or for the forward trestle of a support assembly constructed of such a trestle as well as a rearward trestle which can travel with the assembly and be moved with respect to the forward trestle.
  • a 'total setting force of the rear trestle of 16 tons results using a pressure in the supply pipe for the hydraulic system of 100 atmospheres.
  • this trestle with the same pressure of the hydraulic medium will have a setting force of 5 tons.
  • This setting force can be increased to the same amount as that of the rear trestle of 16 tons or even higher, for example, 20 tons, by using a pressure increasing assembly having a piston area of cm.2 or 200 cm?.
  • the pressure cylinders of the novel pressure increasing assemblies usually do not require a pressure relief valve of their own, because the hydraulic prop and/or support of the trestle or frame, chosen in number and their supporting capabilities correctly for the support of a working area, is not in danger of being completely pushed in or buckling when yielding to the pressure of the rock or the subsidence of the mine. They are not rigid and as a means for protecting these pressure increase cylinders against overload, the same pressure relief valve provided for the prop proper against overload may be used.
  • the devices and systems for controlling the feed and discharge pipes of the pressure medium are the conventional types and valves of the multiple-way cock type or the like may be used, although they are not specifically illustrated in the drawing.
  • a hydraulic mine prop using a pressure medium acting upon a piston to provide a prop setting force
  • the improvement comprising: means for increasing the setting force of a prop and including a hydraulic pressure assembly having a short stroke in comparison to the pressure medium supply means connected to introduce Y pressure medium to the prop.
  • a hydraulic mine prop comprising, in combination:
  • a device for increasing the setting force of said prop including a hydraulic pressure assembly having a short stroke in comparison to the stroke ⁇ of said prop, said assembly being operable independently of said prop and having a piston formed as Ia receptacle and surrounding and holding the end of one of said prop sections, said assembly having a piston area which is substantially larger than the piston area of said prop.
  • a hydraulic mine prop comprising, in combination:
  • each assembly including (l) a cylinder defining a chamber,
  • a piston formed as a receptacle and surrounding and holding the end of one of said prop sections so that one piston holds the head of the prop and the other piston holds the foot of the pro-p, the piston area of said piston being at least twice as large as the piston area of said prop, the inner bottom surface of the piston holding the head of the prop having a downwardly eX- .tending projection forming a joint with a corresponding recess in the prop head, and

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)
  • Actuator (AREA)
  • Press Drives And Press Lines (AREA)
US279168A 1962-05-12 1963-05-09 Hydraulic mine prop Expired - Lifetime US3145964A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEG34969A DE1230390B (de) 1962-05-12 1962-05-12 Hydraulischer Grubenstempel

Publications (1)

Publication Number Publication Date
US3145964A true US3145964A (en) 1964-08-25

Family

ID=7125057

Family Applications (1)

Application Number Title Priority Date Filing Date
US279168A Expired - Lifetime US3145964A (en) 1962-05-12 1963-05-09 Hydraulic mine prop

Country Status (3)

Country Link
US (1) US3145964A (id)
BE (1) BE632029A (id)
DE (1) DE1230390B (id)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236489A (en) * 1964-04-03 1966-02-22 Globe Pneumatic Engineering Co Power operated screw jacks
US3301519A (en) * 1964-10-20 1967-01-31 Gewerk Eisenhuette Westfalia Double telescoping hydraulic prop
US3672174A (en) * 1969-12-04 1972-06-27 Hansjeackim Ven Hippel Method and apparatus for supporting the roofs in underground excavations
US4082657A (en) * 1976-01-19 1978-04-04 Gage Ernest L Separator apparatus
US4662606A (en) * 1984-04-16 1987-05-05 Kabushiki Kaisha Iseki Kaihatsu Koki Pipe propelling device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1290109B (de) * 1967-10-21 1969-03-06 Gewerk Eisenhuette Westfalia Stempel fuer den Ausbau bzw. zur Abspannung im Streb/Streckenuebergang
AT360466B (de) * 1979-03-14 1981-01-12 Voest Alpine Ag Ventilanordnung fuer die steuerung des hubes eines teleskopisch ausfahrbaren stempels

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US762627A (en) * 1904-01-21 1904-06-14 Ferdinand Fink Fluid-pressure motor.
US2473687A (en) * 1945-10-09 1949-06-21 Westinghouse Air Brake Co Fluid pressure relay valve mechanism
DE918561C (de) * 1951-08-08 1954-09-30 Arthur Hamel Hydraulischer Grubenstempel
US2754804A (en) * 1954-01-15 1956-07-17 Goodman Mfg Co Automatic feed pressure control for telescopic stoper leg
DE960463C (de) * 1952-10-08 1957-03-21 Albert Ag Chem Werke Verfahren zur Herstellung von 2, 4, 6-Trimethylolphenolen
GB877869A (en) * 1959-04-24 1961-09-20 Toussaint & Hess Gmbh Improvements relating to hydraulic piston apparatus
DE1125863B (de) * 1961-06-19 1962-03-22 Gewerk Eisenhuette Westfalia Hydraulischer Stempel, insbesondere fuer Abspannungszwecke

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1070316A (fr) * 1952-02-05 1954-07-22 Coal Industry Patents Ltd Support de toit pour mines
DE974823C (de) * 1955-05-28 1961-05-18 Gewerk Eisenhuette Westfalia Wandernder Grubenausbau
AT195875B (de) * 1955-11-16 1958-02-25 Bochumer Eisen Heintzmann Strebausbau für den untertägigen Abbaubetrieb
AT202953B (de) * 1957-01-25 1959-04-25 Beien Maschfab Hydraulisch-pneumatische Stützvorrichtung, insbesondere Grubenstempel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US762627A (en) * 1904-01-21 1904-06-14 Ferdinand Fink Fluid-pressure motor.
US2473687A (en) * 1945-10-09 1949-06-21 Westinghouse Air Brake Co Fluid pressure relay valve mechanism
DE918561C (de) * 1951-08-08 1954-09-30 Arthur Hamel Hydraulischer Grubenstempel
DE960463C (de) * 1952-10-08 1957-03-21 Albert Ag Chem Werke Verfahren zur Herstellung von 2, 4, 6-Trimethylolphenolen
US2754804A (en) * 1954-01-15 1956-07-17 Goodman Mfg Co Automatic feed pressure control for telescopic stoper leg
GB877869A (en) * 1959-04-24 1961-09-20 Toussaint & Hess Gmbh Improvements relating to hydraulic piston apparatus
DE1125863B (de) * 1961-06-19 1962-03-22 Gewerk Eisenhuette Westfalia Hydraulischer Stempel, insbesondere fuer Abspannungszwecke

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236489A (en) * 1964-04-03 1966-02-22 Globe Pneumatic Engineering Co Power operated screw jacks
US3301519A (en) * 1964-10-20 1967-01-31 Gewerk Eisenhuette Westfalia Double telescoping hydraulic prop
US3672174A (en) * 1969-12-04 1972-06-27 Hansjeackim Ven Hippel Method and apparatus for supporting the roofs in underground excavations
US4082657A (en) * 1976-01-19 1978-04-04 Gage Ernest L Separator apparatus
US4662606A (en) * 1984-04-16 1987-05-05 Kabushiki Kaisha Iseki Kaihatsu Koki Pipe propelling device
US4815695A (en) * 1984-04-16 1989-03-28 Kabushiki Kaisha Iseki Kaihatsu Koki Pipe propelling device

Also Published As

Publication number Publication date
DE1230390B (de) 1966-12-15
BE632029A (id)

Similar Documents

Publication Publication Date Title
US3145964A (en) Hydraulic mine prop
GB1577578A (en) Hydraulic actuating devices for use with stabilising beams
GB823127A (en) Improvements in and relating to mine roof support systems
US4391181A (en) Hydraulic control systems for mining apparatus
GB741150A (en) Improvements in mine roof supports
GB1001411A (en) Roof supports suitable for use in mines
US3603614A (en) Means for stabilizing a civil engineering machine
US3991578A (en) Self-advancing mine roof supports
GB1016061A (en) Mine roof support
US4534681A (en) Mine roof supports
GB905379A (en) Improvements relating to hydraulic mine roof supporting devices
GB1131356A (en) Shifting device for longwall conveyors
ES482866A1 (es) Dispositivo de control hidraulico para un dispositivo de re-cubrimiento de grietas y de alineacion
GB1402214A (en) Device for feeding a hydraulic load element mounted on a telescopic structure by means of two jacks
US3646768A (en) Mine roof supports
GB1378513A (en) Connection for use between mine roof support and conveyor
GB935843A (en) A travelling support frame for the support of galleries in mines
GB1135942A (en) Improvements relating to roof supports for mine workings
US3619008A (en) Supporting and rotational resetting device on a tunnel-driving machine
US3590586A (en) Mine roof supports
GB816702A (en) Improvements relating to hydraulic apparatus for mining machinery
US3537601A (en) Shaft mucker
GB1119206A (en) Improvements in or relating to mine roof supports
GB943531A (en) Roof support for use in mines
GB1001412A (en) Roof supports suitable for use in mines