US2233205A - Mining cartridge - Google Patents

Mining cartridge Download PDF

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Publication number
US2233205A
US2233205A US224660A US22466038A US2233205A US 2233205 A US2233205 A US 2233205A US 224660 A US224660 A US 224660A US 22466038 A US22466038 A US 22466038A US 2233205 A US2233205 A US 2233205A
Authority
US
United States
Prior art keywords
cartridge
wires
bag
container
covering
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
US224660A
Other languages
English (en)
Inventor
Samuel G Frantz
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.)
BRUNSON S MCCUTCHEN
Original Assignee
BRUNSON S MCCUTCHEN
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
Priority to BE435825D priority Critical patent/BE435825A/xx
Application filed by BRUNSON S MCCUTCHEN filed Critical BRUNSON S MCCUTCHEN
Priority to US224660A priority patent/US2233205A/en
Priority to GB20459/39A priority patent/GB541444A/en
Priority to FR858624D priority patent/FR858624A/fr
Application granted granted Critical
Publication of US2233205A publication Critical patent/US2233205A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C37/00—Other methods or devices for dislodging with or without loading
    • E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/10—Devices with expanding elastic casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/20—Tamping cartridges, i.e. cartridges containing tamping material

Definitions

  • This invention relates to ⁇ an improved form of mining cartridge of the type disclosed in my prior Patent No. 1,808,162, issued June 2, 1931.
  • a mining cartridge is described comprising a central .rubber container which may be inflated under pressure, the container having a plurality of re-entrant portions'and being surrounded by a flexible metallic envelope which expands and contracts with' it.
  • An object of this invention is to provide such a mining cartridge adapted to be easily inserted in holes previously drilled in a mass of coal, rock or other material which is to be dislodged and which is provided with a protective metallic covering constructed to permit the ready expansion of the cartridge-under the action of an applied fluid pressure.
  • a further object of the invention comprises a mining cartridge in which a metallic covering of great strength in the form of wires laid spirally and interlaced together is provided.
  • Fig. 2 is a transverse section taken through line 2-2 of Fig. 1;
  • Fig. 3 is an elevation view of a portion of the protectivemetal covering of the cartridge
  • Fig. .4 is a longitudinal section vof one end of a cartridge showing the protective wire or cable covering in process of being secured in place;
  • Fig. 5 is an elevation view of a wire braid which may be used as a wire unit in one form of the protective covering
  • Fig. 'l is a view in elevation, partly broken away, of a cartridge having a modified form of protective metal covering
  • Fig. 8 is a sectional view taken on the line 8-8 of Fig. '1, looking in the direction of the-arrows;
  • Fig. 9 is a view in elevation, partly broken away, l5 showing a modified cartridge having a further modified form of the protective metal covering;
  • Fig. 10 is a fragmentary view showing a portion of the metallic covering of Fig. 9.
  • An expansible bag I formed of rubber or other elastic material and generally cylindrical in form is provided with :a generally cylindrical shaped aperture 4 'formed through its center.
  • metal plugs 6 and 1 preferably formed oi' brass, bronze or similar metal, plug 6 being solid so as to form a closure for one end of the bag.
  • Plug l is provided with a central aperture 8 terminating in a threaded bore 9 into which may be screwed the threaded end of a pipe or other conduit I0 adapted to supply Water or other fluid under high pressure to promote the 'expansion of the bag.
  • the end plug 6 shown in Fig. 1 may also be'perforated, if desired, to facilitate the escape of air from the bag.
  • the covering is composed of flexible, tensionresisting elements which may be wires or cables. These elements are laid helically', making an angle with the axis whose tangent is substantially less than the square root of 2.v 'I'here is a sub- 50 stantiaily equal number of these elementslaid in opposite directions.
  • the elements may, for example, be arranged as two separate layers, one outside the other, the inner layer being left-hand pitch and the outerss layer right-hand pitch as shown in Fig. '1, or preferably groups of the helical elements may be braided together to form a tubular braid as shown inFig. 3, in which'the helical wires or cables are arranged in groups of three, each group alternately passing over and under three groups of the opposite directions.
  • the group I3 comprising the elements I4, I5 and I6 passes under the groups I1, I8 Iand I9 and over the elements of the three adjacent and parallel groups 20, 2
  • thel tube may be expanded by internal pressure up to a certain point at which the wires are at a certain angle
  • S is the length of one wire in one pitch of the helix, since the ends of the wires are not free to rotate or unwrap, S will be a constant in any cartridge regardless of the diameter at which S is measured.
  • pD:c pDS cos a giving a share of tangential force for each wire equal to @DS cos a 4N given above are the only forces, and since the wires are flexible, the wires will assume such an inclination 'a that tan a equals the ratio of the tangential force per wire to the axial force per wire, or
  • a cartridge embodying this invention when subjected to internal fluid pressure, a cartridge embodying this invention will expand freely to such a diameter that the wires approach as a limit an angle whose tangent is the square root of 2 with the axis; thereafter further expansion will be prevented, except for such slight amount as is permitted by the elastic elongation of the stressed wires. The less the friction between the elements the closer will be the approach to the limiting angle.
  • a suitable end construction for a cartridge of the kind described must comprise a closure for the bag I which is iiuid tight at the maximum pressure to be employed, and also a positive pressed into position on the endof the cartridge y cooperate with plugs 6 and 'I to accomplish these y two purposes. Furthermore, the sleeves must be made strong enough at the inner ends t'o success- .fully resist the radial component of tension in the helical elements where they enter the shell when the cartridge is expanded under pressure.
  • Fig. 4 is shown a practical and advantageous means for adequately securing the covering to the-plugs and. also for retaining the plugs securely to the ends of the bag.
  • the end sleeve II is provided with a main cylindrical portion of larger diameter than the finished sleeve so as to easily pass over the wire covering when in place,
  • the bag l of Figf. l is composed of the same rubber composition throughout.
  • the central portion 29 of the bag is formed of a layer of soft rubber compound capable of being stretched a large amount and an outer layer 30 formed of a tough rubber compound less easily stretehed.
  • the layers may be vulcanized together to form the bag unit. Since the inner portion of the bag l is called upon to stretch by a much greater percentage than the outer portions, the construction illustrated in Fig. 6 is desirable where large ratios of expansion are required.
  • Figs. 9 and 10 disclosure is made of a modified form of cartridge in which the elastic bag la is integrally closed at one end, and in which a metallicsheath 33 is made up in the form of a woven wire bag which surrounds the closed end of the rubber bag la.
  • the wires composing the sheath 33 extend spirally in opposed directions about the body of the bag and are anchored at their ends within a'sleeve I2a in the same manner in which the wires 'of Fig. 1 are anchored within the sleeve I2 of that figure.
  • a mining cartridge comprising, in combination, a container generally cylindrical in shape and capable of radial and longitudinal expansion l when subjected to internal pressure, and a cornplete cover for the container arranged ⁇ to receive the full end thrust of the expanding container and to utilize the end thrust for limiting radial expansion, comprising end closure means and a exible, protective, pressure transmitting sheath composed exclusively of two sets of helically laid, ilexible, substantially inextensible tension resisting ⁇ elements of equal but opposite pitch secured t-o the end closure means in torsionally balanced Lrelation, the container as well as the tension elements being secured to the end closure means.
  • a mining cartridge comprising, in combination, a container generally cylindrical in shape and capable of radial and longitudinal expansion when subjected to internal pressure, and a complete cover for the container 'arranged to receive the full end thrust of the expanding container and t ⁇ o utilize the end thrust for limiting radial expansion, comprising end closure means and a flexible, protective, pressure transmitting sheath composed exclusively of two sets of helically laid,
  • said end closure means comprising a plug having a portion of lesser diameter and a portion of greater diameter', the associated container end extending around the portion of lesser diameter only, and the sheath extending around the portion of greater diameter, and clamping means for clamping the container and the sheath directly to the plug.
  • a mining cartridge comprising, in combination, a container generally cylindrical in shape and capable of radial and longitudinal expansion when subjected to internal pressure, and a complete cover for the container arranged to re-l sionally balanced relation, said container com-- prising an inner layer of soft rubber compound and an outer layer of a harder rubber compound closely united to said inner layer, both layers being expansible, but the outer layer being tougher and more resistant to expansion than the inner layer.
  • a mining cartridge comprising, in combina-7 'ing substantially across the entire endl faces of said cover and a exible, protective; pressure transmitting sheath composed of two sets oi' helically laid flexible, substantially inextensible tension resisting elements of equal but opposite pitch secured to the end closure means in torsionally balanced relation.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Earth Drilling (AREA)
  • Buffer Packaging (AREA)
US224660A 1938-08-13 1938-08-13 Mining cartridge Expired - Lifetime US2233205A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE435825D BE435825A (sv) 1938-08-13
US224660A US2233205A (en) 1938-08-13 1938-08-13 Mining cartridge
GB20459/39A GB541444A (en) 1938-08-13 1939-07-13 Improvements in mining cartridges
FR858624D FR858624A (fr) 1938-08-13 1939-08-03 Cartouche de mine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US224660A US2233205A (en) 1938-08-13 1938-08-13 Mining cartridge

Publications (1)

Publication Number Publication Date
US2233205A true US2233205A (en) 1941-02-25

Family

ID=22841609

Family Applications (1)

Application Number Title Priority Date Filing Date
US224660A Expired - Lifetime US2233205A (en) 1938-08-13 1938-08-13 Mining cartridge

Country Status (4)

Country Link
US (1) US2233205A (sv)
BE (1) BE435825A (sv)
FR (1) FR858624A (sv)
GB (1) GB541444A (sv)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634113A (en) * 1946-09-04 1953-04-07 Joy Mfg Co Combined drill and expansible breaker mechanism
US2796797A (en) * 1953-02-21 1957-06-25 Dynamit Nobel Ag Method of producing armoured synthetic plastic tubes
US3401946A (en) * 1967-08-07 1968-09-17 Lynes Inc Inflatable device
US4255038A (en) * 1976-09-09 1981-03-10 Joachim Simon Holder for photographic processing machines
WO1993010330A1 (en) * 1991-11-22 1993-05-27 Westboenergi Ab Fracturing device
EP1987229A1 (en) * 2006-02-15 2008-11-05 Emstone AB Device for breaking solid material and method of manufacturing a hose element for such a device
CN109579626A (zh) * 2019-01-28 2019-04-05 贵州大学 一种便于进行锁合的爆破筒

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511005A (en) * 1945-09-28 1950-06-13 John E Pool Mine clearing snake

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2634113A (en) * 1946-09-04 1953-04-07 Joy Mfg Co Combined drill and expansible breaker mechanism
US2796797A (en) * 1953-02-21 1957-06-25 Dynamit Nobel Ag Method of producing armoured synthetic plastic tubes
US3401946A (en) * 1967-08-07 1968-09-17 Lynes Inc Inflatable device
US4255038A (en) * 1976-09-09 1981-03-10 Joachim Simon Holder for photographic processing machines
WO1993010330A1 (en) * 1991-11-22 1993-05-27 Westboenergi Ab Fracturing device
EP1987229A1 (en) * 2006-02-15 2008-11-05 Emstone AB Device for breaking solid material and method of manufacturing a hose element for such a device
EP1987229A4 (en) * 2006-02-15 2013-11-06 Emstone Ab SOLID MATERIAL BREAKING DEVICE AND METHOD FOR MANUFACTURING FLEXIBLE PIPE MEMBER FOR SUCH A DEVICE
CN109579626A (zh) * 2019-01-28 2019-04-05 贵州大学 一种便于进行锁合的爆破筒

Also Published As

Publication number Publication date
FR858624A (fr) 1940-11-29
BE435825A (sv)
GB541444A (en) 1941-11-27

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