FR2297994A1 - Telescopic hydraulic pit prop - has tube from valve housing with radial ribs to inside of upper prop section - Google Patents

Telescopic hydraulic pit prop - has tube from valve housing with radial ribs to inside of upper prop section

Info

Publication number
FR2297994A1
FR2297994A1 FR7600817A FR7600817A FR2297994A1 FR 2297994 A1 FR2297994 A1 FR 2297994A1 FR 7600817 A FR7600817 A FR 7600817A FR 7600817 A FR7600817 A FR 7600817A FR 2297994 A1 FR2297994 A1 FR 2297994A1
Authority
FR
France
Prior art keywords
section
prop
tube
valve housing
radial ribs
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
Application number
FR7600817A
Other languages
French (fr)
Other versions
FR2297994B1 (en
Inventor
Karoly Balazs
Jozsef Korbuly
Laszlo Nemeth
Janos Viragh
Laszlo Zachar
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.)
Banyaszati Kutato Intezet
Original Assignee
Banyaszati Kutato Intezet
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 Banyaszati Kutato Intezet filed Critical Banyaszati Kutato Intezet
Publication of FR2297994A1 publication Critical patent/FR2297994A1/en
Application granted granted Critical
Publication of FR2297994B1 publication Critical patent/FR2297994B1/fr
Granted legal-status Critical Current

Links

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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/06—Foundation trenches ditches or narrow shafts
    • E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
    • E02D17/086—Travelling trench shores
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G25/00—Shores or struts; Chocks
    • E04G25/04—Shores or struts; Chocks telescopic
    • E04G2025/047—Shores or struts; Chocks telescopic which telescoping action effected by a piston

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Paleontology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Forging (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Actuator (AREA)
  • Safety Valves (AREA)
  • Fluid-Damping Devices (AREA)
  • Check Valves (AREA)

Abstract

The prop has a lower tubular section closed by a bottom cover, and an upper section sliding in the lower section and with a piston at its lower end. There is a sealing ring in the top end of the lower section, acting against the upper section and at the upper end of the upper section is a valve housing, connected by an internal tube to the pressure chamber. A preloaded spring inside the tube pulls the upper section down. The tube (13) has ribs (21) extending radially outwards to the inner wall of the upper prop section (2), and there is an elastically-supported prop head at the top end of the upper prop section.
FR7600817A 1975-01-15 1976-01-14 Telescopic hydraulic pit prop - has tube from valve housing with radial ribs to inside of upper prop section Granted FR2297994A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HU76BA3188A HU171077B (en) 1975-01-15 1975-01-15 Hydraulic prop

Publications (2)

Publication Number Publication Date
FR2297994A1 true FR2297994A1 (en) 1976-08-13
FR2297994B1 FR2297994B1 (en) 1982-10-08

Family

ID=10993392

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7600817A Granted FR2297994A1 (en) 1975-01-15 1976-01-14 Telescopic hydraulic pit prop - has tube from valve housing with radial ribs to inside of upper prop section

Country Status (11)

Country Link
AT (3) AT350026B (en)
BE (1) BE837562A (en)
BG (1) BG36048A3 (en)
CS (2) CS252801B2 (en)
DD (2) DD209876A5 (en)
DE (1) DE2600461C3 (en)
FR (1) FR2297994A1 (en)
HU (1) HU171077B (en)
PL (1) PL108022B1 (en)
RO (1) RO73938A (en)
YU (1) YU37216B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368604A1 (en) * 1976-10-19 1978-05-19 Perrier Henri Hydraulic mining prop placing equipment - comprises mobile machine with extensible boom and hydraulic system for supplying pressure fluid to prop

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8808519U1 (en) * 1988-07-04 1989-11-02 Heiliger, Martha-Catharina, 5166 Kreuzau Hydraulic steel pit ram
DE4323462C2 (en) * 1993-07-14 1995-05-04 Vos Richard Grubenausbau Gmbh Removal stamp for underground use with integrated pressure relief valve
CN103644166A (en) * 2013-12-26 2014-03-19 淮北安来机电装备有限公司 Oil/air cylinder with single cylindrical surface guide in inner cylinder hole

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834506A (en) * 1929-02-25 1931-12-01 Standard Lift Company Hydraulic elevator
GB538277A (en) * 1940-01-18 1941-07-28 William Herbert Smith Improvements relating to mine roof or like supports
US2379949A (en) * 1943-03-04 1945-07-10 Fred S Carver Hydraulic device
FR939620A (en) * 1946-03-14 1948-11-19 Hydraulic lifting device permanently mounted on a vehicle to lift it
FR1005572A (en) * 1947-08-12 1952-04-11 Iron profile for mine support
DE924022C (en) * 1952-07-04 1955-02-24 Ringfeder Gmbh Crown plate movably arranged by means of a ball joint in the pressure piece of a pit punch
DE971164C (en) * 1944-02-04 1958-12-18 F W Moll Soehne Maschinenfabri Pit punch head
DE1085121B (en) * 1955-02-26 1960-07-14 Hoesch Ag Pressurized pit stamp
US2961839A (en) * 1956-08-28 1960-11-29 Fausto A Aresti Hydraulic compression member
FR1351922A (en) * 1963-03-25 1964-02-07 extendable mine prop
FR1549102A (en) * 1966-12-31 1968-12-06
GB1356008A (en) * 1971-09-17 1974-06-12 Coal Industry Patents Ltd Mine roof supports

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1834506A (en) * 1929-02-25 1931-12-01 Standard Lift Company Hydraulic elevator
GB538277A (en) * 1940-01-18 1941-07-28 William Herbert Smith Improvements relating to mine roof or like supports
US2379949A (en) * 1943-03-04 1945-07-10 Fred S Carver Hydraulic device
DE971164C (en) * 1944-02-04 1958-12-18 F W Moll Soehne Maschinenfabri Pit punch head
FR939620A (en) * 1946-03-14 1948-11-19 Hydraulic lifting device permanently mounted on a vehicle to lift it
FR1005572A (en) * 1947-08-12 1952-04-11 Iron profile for mine support
DE924022C (en) * 1952-07-04 1955-02-24 Ringfeder Gmbh Crown plate movably arranged by means of a ball joint in the pressure piece of a pit punch
DE1085121B (en) * 1955-02-26 1960-07-14 Hoesch Ag Pressurized pit stamp
US2961839A (en) * 1956-08-28 1960-11-29 Fausto A Aresti Hydraulic compression member
FR1351922A (en) * 1963-03-25 1964-02-07 extendable mine prop
FR1549102A (en) * 1966-12-31 1968-12-06
GB1356008A (en) * 1971-09-17 1974-06-12 Coal Industry Patents Ltd Mine roof supports

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2368604A1 (en) * 1976-10-19 1978-05-19 Perrier Henri Hydraulic mining prop placing equipment - comprises mobile machine with extensible boom and hydraulic system for supplying pressure fluid to prop

Also Published As

Publication number Publication date
CS22376A2 (en) 1987-03-12
ATA16176A (en) 1978-10-15
YU37216B (en) 1984-08-31
YU8476A (en) 1983-04-27
DD123216A5 (en) 1976-12-05
FR2297994B1 (en) 1982-10-08
AT368601B (en) 1982-10-25
AT350026B (en) 1979-05-10
ATA103278A (en) 1979-08-15
DE2600461C3 (en) 1978-11-16
DD209876A5 (en) 1984-05-23
CS259543B2 (en) 1988-10-14
CS809786A2 (en) 1988-02-15
ATA513476A (en) 1982-02-15
BG36048A3 (en) 1984-08-15
PL108022B1 (en) 1980-03-31
DE2600461B2 (en) 1978-03-30
RO73938A (en) 1980-10-30
HU171077B (en) 1977-11-28
AT355536B (en) 1980-03-10
CS252801B2 (en) 1987-10-15
BE837562A (en) 1976-05-03
DE2600461A1 (en) 1976-07-22

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Legal Events

Date Code Title Description
ST Notification of lapse