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 sectionInfo
- 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
Links
- 238000007789 sealing Methods 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
- E21D15/14—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)
- General Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Fluid-Damping Devices (AREA)
- Check Valves (AREA)
- Safety 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.
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)
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)
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)
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 |
-
1975
- 1975-01-15 HU HU76BA3188A patent/HU171077B/en not_active IP Right Cessation
-
1976
- 1976-01-08 DE DE2600461A patent/DE2600461C3/en not_active Expired
- 1976-01-13 AT AT16176A patent/AT350026B/en not_active IP Right Cessation
- 1976-01-13 CS CS76223A patent/CS252801B2/en unknown
- 1976-01-14 DD DD76250662A patent/DD209876A5/en unknown
- 1976-01-14 YU YU0084/76A patent/YU37216B/en unknown
- 1976-01-14 BE BE163510A patent/BE837562A/en unknown
- 1976-01-14 DD DD190804A patent/DD123216A5/xx unknown
- 1976-01-14 FR FR7600817A patent/FR2297994A1/en active Granted
- 1976-01-15 RO RO7684511A patent/RO73938A/en unknown
- 1976-01-15 PL PL1976186559A patent/PL108022B1/en unknown
- 1976-01-15 BG BG7632092A patent/BG36048A3/en unknown
- 1976-07-13 AT AT0513476A patent/AT368601B/en not_active IP Right Cessation
-
1978
- 1978-02-14 AT AT103278A patent/AT355536B/en not_active IP Right Cessation
-
1986
- 1986-11-10 CS CS868097A patent/CS259543B2/en unknown
Patent Citations (12)
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)
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 |
---|---|
AT350026B (en) | 1979-05-10 |
PL108022B1 (en) | 1980-03-31 |
ATA103278A (en) | 1979-08-15 |
BG36048A3 (en) | 1984-08-15 |
YU37216B (en) | 1984-08-31 |
BE837562A (en) | 1976-05-03 |
ATA513476A (en) | 1982-02-15 |
CS252801B2 (en) | 1987-10-15 |
AT355536B (en) | 1980-03-10 |
CS259543B2 (en) | 1988-10-14 |
DE2600461A1 (en) | 1976-07-22 |
ATA16176A (en) | 1978-10-15 |
FR2297994B1 (en) | 1982-10-08 |
HU171077B (en) | 1977-11-28 |
CS809786A2 (en) | 1988-02-15 |
AT368601B (en) | 1982-10-25 |
DE2600461B2 (en) | 1978-03-30 |
DD123216A5 (en) | 1976-12-05 |
YU8476A (en) | 1983-04-27 |
DE2600461C3 (en) | 1978-11-16 |
DD209876A5 (en) | 1984-05-23 |
RO73938A (en) | 1980-10-30 |
CS22376A2 (en) | 1987-03-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |