FR978701A - forestay or prop - Google Patents

forestay or prop

Info

Publication number: FR978701A
Authority: FR; France
Prior art keywords: forestay; prop
Prior art date: 1948-01-12
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

Application number

Other languages

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.)

Dowty Equipment Ltd

Original Assignee

Dowty Equipment Ltd

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.)

1948-01-12

Filing date

1949-04-05

Publication date

1951-04-17

1948-01-12 Priority claimed from GB92548A external-priority patent/GB636568A/en

1949-04-05 Application filed by Dowty Equipment Ltd filed Critical Dowty Equipment Ltd

1951-04-17 Application granted granted Critical

1951-04-17 Publication of FR978701A publication Critical patent/FR978701A/en

Status Expired legal-status Critical Current

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
- E21D15/60—Devices for withdrawing props or chocks
- 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
- E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators

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)
Control Of Presses (AREA)
Safety Valves (AREA)

FR978701D 1948-01-12 1949-04-05 forestay or prop Expired FR978701A (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
GB92548A GB636568A (en)	1953-07-20	1948-01-12	Improvements in pit props and other telescopic struts
GB2011253A GB726384A (en)	1953-07-20	1953-07-20	Improvements in pit props and other telescopic struts

Publications (1)

Publication Number	Publication Date
FR978701A true FR978701A (en)	1951-04-17

Family

ID=32299627

Family Applications (2)

Application Number	Title	Priority Date	Filing Date
FR978701D Expired FR978701A (en)	1948-01-12	1949-04-05	forestay or prop
FR69104D Expired FR69104E (en)	1948-01-12	1954-07-20	forestay or prop

Family Applications After (1)

Application Number	Title	Priority Date	Filing Date
FR69104D Expired FR69104E (en)	1948-01-12	1954-07-20	forestay or prop

Country Status (5)

Country	Link
US (1)	US2621631A (en)
BE (1)	BE486663A (en)
DE (1)	DE808225C (en)
FR (2)	FR978701A (en)
NL (1)	NL76043C (en)

Families Citing this family (38)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE1072941B (en) *		1960-01-14	-Ing H Joe Rheinbay Marienheide Dipl (RhId)	Hydraulically operated pit ram equipped with a floating piston that is acted upon by atmospheric or compressed air pressure
US2899976A (en) *		1959-08-18		Release relief valve
GB700790A (en) *	1951-07-19	1953-12-09	Dowty Auto Units Ltd	Improvements relating to valves
US2888231A (en) *	1952-05-27	1959-05-26	Mining Engineering Co Ltd	Roof supports
US2888230A (en) *	1952-06-16	1959-05-26	Mining Engineering Co Ltd	Roof supports
GB746862A (en) *	1953-09-04	1956-03-21	Dowty Hydraulic Units Ltd	Improvements in hydraulic pit props
NL191038A (en) *	1953-09-24	1900-01-01
GB767012A (en) *	1953-11-12	1957-01-30	Coal Industry Patents Ltd	Improvements in or relating to pit or like props
BE553227A (en) *	1955-06-10
DE1131625B (en) *	1955-08-13	1962-06-20	Kronprinz Ag	Hydraulic pit ram
BE552440A (en) *	1955-12-13
DE1062654B (en) *	1956-04-03	1959-08-06	Kloeckner Bergbau Viktor Icker	Hydraulic pit ram
DE1081848B (en) *	1956-06-28	1960-05-19	Becorit Grubenausbau Gmbh	Hydraulic pit ram
GB837916A (en) *	1957-01-31	1960-06-15	Dowty Mining Equipment Ltd	Improvements relating to telescopic tubular pit props
DE1108157B (en) *	1957-02-11	1961-06-08	Hermann Schwarz K G	Pressure medium space for elements of the pit lining
GB894292A (en) *	1957-07-30	1962-04-18	Mastabar Mining Equip Co Ltd	Improvements in or relating to hydraulic props, particularly pit props
DE1061273B (en) *	1958-01-13	1959-07-16	Kloeckner Bergbau Victor Icker	Hydraulic pit ram
GB862033A (en) *	1958-10-29	1961-03-01	Mastabar Mining Equip Co Ltd	Improvements in or relating to extensible hydraulic supports
NL110999C (en) *	1958-11-24
US2996888A (en) *	1959-01-26	1961-08-22	Raymond Int Inc	Hydraulic pile puller
NL248713A (en) *	1959-02-23
GB962542A (en) *	1959-08-21	1964-07-01	Acrow Eng Ltd	Improvements in and relating to hydraulic props
US3134398A (en) *	1960-06-17	1964-05-26	Acrow Eng Ltd	Hydraulic prop valve
DE1137406B (en) *	1960-06-30	1962-10-04	Kronprinz Ag	Hydraulic pit ram
FR1280684A (en) *	1960-11-22	1962-01-08	Sagem	hydraulic prop
GB954676A (en) *	1960-12-22	1964-04-08	Dowty Mining Equipment Ltd	Telescopic hydraulic props
DE1215635B (en) *	1963-11-29	1966-05-05	Rheinstahl Gmbh Wanheim	Friction stamp with hydraulic setting and clamping device
GB1080831A (en) *	1964-01-17	1967-08-23	Soc Anglo Belge Vulcain Sa	Nuclear reactor control mechanism
DE2603978C3 (en) *	1976-02-03	1982-10-14	Thyssen Industrie Ag, 4300 Essen	Rock impact valve arrangement in a hydraulic pit ram
US4237769A (en) *	1978-04-03	1980-12-09	Commercial Shearing, Inc.	Relief valves and mine props incorporating the same
ZA785167B (en) *	1978-09-12	1979-08-29	Bochumer Eisen Heintzmann	A hydraulic mine prop
DE8808519U1 (en) *	1988-07-04	1989-11-02	Heiliger, Martha-Catharina, 5166 Kreuzau	Hydraulic steel pit ram
DE9005343U1 (en) *	1990-05-11	1990-08-30	Heiliger, Robert Wilhelm, 5166 Kreuzau	Hydraulic steel pit ram
DE4140317C2 (en) *	1991-12-06	1995-03-23	Vos Richard Grubenausbau Gmbh	Valve arrangement for single punch expansion in underground mining and tunneling
EP0695394B1 (en) *	1993-05-07	1999-03-10	Dorbyl Limited	Support prop
DE4323462C2 (en) *	1993-07-14	1995-05-04	Vos Richard Grubenausbau Gmbh	Removal stamp for underground use with integrated pressure relief valve
US20120148350A1 (en) *	2010-12-10	2012-06-14	Kenneth Poulson	Mine prop jack and method of prestressing a mine prop
CN106499421B (en) *	2016-11-03	2019-01-08	中国矿业大学	A kind of mechanical constant-resistance individual prop withdrawing technique and recovery method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US151670A (en) *		1874-06-02		Improvement in hydraulic lifting-jacks
US1133270A (en) *	1913-05-03	1915-03-30	Charles E Dale	Pump appliance.
US1598426A (en) *	1925-07-03	1926-08-31	Ingersoll Rand Co	Shank and bit punch
US1805588A (en) *	1926-01-05	1931-05-19	Manley Mfg Company	Hydraulic jack
US1706309A (en) *	1927-02-04	1929-03-19	May Sumner	Hydraulic and other fluid pressure lifting jack
US2284228A (en) *	1940-03-18	1942-05-26	Herbert E Page	Pressure multiplying mechanism

0
- BE BE486663D patent/BE486663A/xx unknown
1948
- 1948-11-08 US US58949A patent/US2621631A/en not_active Expired - Lifetime
- 1948-12-15 NL NL143867A patent/NL76043C/xx active
- 1948-12-20 DE DEP25763A patent/DE808225C/en not_active Expired
1949
- 1949-04-05 FR FR978701D patent/FR978701A/en not_active Expired
1954
- 1954-07-20 FR FR69104D patent/FR69104E/en not_active Expired

Also Published As

Publication number	Publication date
BE486663A (en)
NL76043C (en)	1954-05-15
DE808225C (en)	1951-07-12
FR69104E (en)	1958-10-01
US2621631A (en)	1952-12-16

Publication	Publication Date	Title
FR978701A (en)	1951-04-17	forestay or prop
FR1008735A (en)	1952-05-21	Roofing
AT167745B (en)	1951-02-26	Tiller
FR1024763A (en)	1953-04-07	telescopic forestay or prop
FI25296A (en)	1951-09-10	Spinnspö
FR1006677A (en)	1952-04-25	prop
FR988964A (en)	1951-09-03	Tiller
FR1010607A (en)	1952-06-13	Window
FR969706A (en)	1950-12-26	Corkscrew
FI25112A (en)	1951-06-11	Recupervative coloring xlare
AT180236B (en)	1954-11-25	Wehrschütz
BE585725Q (en)	1960-06-16	Vensters
ES18197Y (en)	1950-08-16	Box-case
ES17250Y (en)	1949-01-01	Espadrille
ES16579Y (en)	1948-12-01	Portaviews
FI24255A (en)	1950-04-11	Uppvärmningsapparat eller spritkök
FI24858A (en)	1951-02-10	Blandkoppling
FI23557A (en)	1949-03-10	Mätstång
FI25061A (en)	1951-05-10	Flishugg
FI25050A (en)	1951-05-10	Oventuki
FI25017A (en)	1951-04-10	Rakapparat
FI24961A (en)	1951-04-10	Vätskeförångningsapparat
FI25154A (en)	1951-07-10	Tvättklämma
FI25329A (en)	1951-10-10	Störningsokänslig signalanordning
FI24845A (en)	1951-02-10	Rengöringsmedel