US3908512A - Explosion gas operated piston-cylinder structure - Google Patents

Explosion gas operated piston-cylinder structure Download PDF

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Publication number
US3908512A
US3908512A US369248A US36924873A US3908512A US 3908512 A US3908512 A US 3908512A US 369248 A US369248 A US 369248A US 36924873 A US36924873 A US 36924873A US 3908512 A US3908512 A US 3908512A
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US
United States
Prior art keywords
piston
pair
cylinder
bounding surfaces
segment
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
US369248A
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English (en)
Inventor
Harald Strubin
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.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
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 BBC Brown Boveri France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US3908512A publication Critical patent/US3908512A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H39/00—Switching devices actuated by an explosion produced within the device and initiated by an electric current

Definitions

  • a piston-cylinder drive structure particularly for use July l2, l972 Switzerland 10352/72 in actuating electric switchgear apparatus comprisesfa cylinder into which explosion gases are admitted for [52] US. Cl 91/357; 92/6 R; 92/89; actuating a piston located in the cylinder. Rather than 92/169; 92/193; 92/247 having a uniform cross-sectional area, the cross- [5 l Int. Cl.
  • F15B 9/02 section of the cylinder is progressively increased in the [58] Field of Search 92/6 R, 6 D, 89, 169, 193, direction of piston travel and the piston includes 92/194, 247, 240; 91/394, 357, 402 means for effecting a like increase in its crosssectional area as it is actuated and maintains its en- [56] References Cited gagement with the cylinder wall. The result is a more UNITED STATES PATENTS favorable force-travel characteristic resulting in prac- 5/1918 Hudford X tically a constant pressure throughout the piston travel 2:554:55; 8,194.
  • This invention relates to an improvement in a drive apparatus of the type in which a piston is displaced in a cylinder by explosion ofa charge, in particular for operating electrical switchgear.
  • the principal object of the invention is to provide a solution such that the pressure and piston displacement are better matched to each other, resulting in a more favorable force/travel characteristic, e.g., practically constant pressure throughout the piston travel, for the drive apparatus described above.
  • This objective is achieved in that the cylinder chamber is of rectangular cross-section, the cross-section area increasing progressively in the direction of piston travel, and that the piston which likewise increases in area incorporates means whereby a seal, at least quasi-leakproof, is maintained between the piston and the inner cylinder wall during the mechanical movement.
  • FIG. 1 is a sectional elevation of the drive apparatus
  • FIG. 2 is a cross-section through the apparatus at line AA and viewed in the direction of the arrows.
  • the drive piston 1 is located in cylinder chamber 2.
  • the latter is of rectangular cross-section increasing progressively in area in the direction of piston displacement.
  • a conical housing 3 contains four segment-shaped elements 2a to 2d.
  • the cylinder chamber 2 thus has two wedge-shaped and two parallel bounding surfaces, the former being formed by elements 20, 2d and the latter by elements 2a, 2b.
  • the housing 3 is enclosed at one end by a flanged cover 4 through which the piston rod 1a of piston 1 passes.
  • an opening 5 through which the explosion gases are admitted.
  • a combustion chamber not described in further detail, with an ignition device and supply of explosion propellant.
  • the head of piston l subjected to the explosion gases and which is expandable in area when moving in the driven direction comprises two flaps 6 which are pivoted about studs 7 to establish the increasing cross-sectional area character of the piston that matches the increasing cross-sectional area of the explosion chamber.
  • the flaps 6 are pressed at their lower rounded ends by spring 8 into sealing engagement against elements 20, 2d.
  • the flaps 6 are sealed along their sides relative to elements 2a, 2]; by pieces 10, e.g., of steel, inserted in corresponding slots.
  • spring devices e.g., corrugated spring strips 9 can be inserted between pieces 10 and the base of the slots, as shown in more detail in FIG. 2.
  • the flaps 6 are sealed relative to one another by a steel element 11 which fills the intervening space.
  • the discharge ports 12 in the segment shaped elements 2a, 2b open at or shortly before the upper end position as they are partly uncovered by the expandable piston head as shown by the broken line position of these flaps in FIG. 1 so that the explosion gases can escape through ports 12 and the openings 13 in flange cover 4. If the switching device is also to be driven in the opposite direction by drive apparatus of the kind proposed, one such apparatus is provided for each direction, the one being returned to its starting position by the other.

Landscapes

  • Actuator (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US369248A 1972-07-12 1973-06-12 Explosion gas operated piston-cylinder structure Expired - Lifetime US3908512A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1035272 1972-07-12

Publications (1)

Publication Number Publication Date
US3908512A true US3908512A (en) 1975-09-30

Family

ID=4362288

Family Applications (1)

Application Number Title Priority Date Filing Date
US369248A Expired - Lifetime US3908512A (en) 1972-07-12 1973-06-12 Explosion gas operated piston-cylinder structure

Country Status (6)

Country Link
US (1) US3908512A (xx)
CH (1) CH547008A (xx)
DE (1) DE2237659A1 (xx)
FR (1) FR2192617A5 (xx)
GB (1) GB1414054A (xx)
IT (1) IT990983B (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995535A (en) * 1975-05-23 1976-12-07 Russell Ozechowski Expansible chamber device
US4452126A (en) * 1981-05-05 1984-06-05 Mitko Tomov Pneumatic drive
US6978711B1 (en) * 1999-04-22 2005-12-27 Van Der Blom Nicolaas Combination of a chamber and a piston, a pump, a motor, a shock absorber and a transducer incorporating the combination
US20080006147A1 (en) * 2002-05-24 2008-01-10 Blom Nicolaas V D Device comprising a combination of a chamber and a piston
EP2884089A1 (de) * 2013-12-10 2015-06-17 Robert Bosch Gmbh Hydraulischer Koppler

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3621186A1 (de) * 1986-06-25 1988-01-07 Bbc Brown Boveri & Cie Verfahren und vorrichtung zum antrieb eines linear bewegbaren bauelementes, insbesondere des beweglichen schaltkontaktes eines elektrischen hochspannungs-leistungsschalters

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1266252A (en) * 1917-05-09 1918-05-14 Louis Hadford Pump.
US2254026A (en) * 1938-08-04 1941-08-26 Carter Carburetor Corp Piston
US2430492A (en) * 1945-10-29 1947-11-11 Carter Carburetor Corp Accelerating pump
US2710077A (en) * 1952-01-16 1955-06-07 Vibratrol Inc Hydraulic shock absorber
US3111808A (en) * 1962-08-20 1963-11-26 Rocket Power Inc Thruster
US3245591A (en) * 1964-02-20 1966-04-12 Crown Cork & Seal Co Dispensing piston can
US3502002A (en) * 1968-04-02 1970-03-24 Whiteman Mfg Co Means for synchronizing a pair of hydraulic power cylinder actuators

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1266252A (en) * 1917-05-09 1918-05-14 Louis Hadford Pump.
US2254026A (en) * 1938-08-04 1941-08-26 Carter Carburetor Corp Piston
US2430492A (en) * 1945-10-29 1947-11-11 Carter Carburetor Corp Accelerating pump
US2710077A (en) * 1952-01-16 1955-06-07 Vibratrol Inc Hydraulic shock absorber
US3111808A (en) * 1962-08-20 1963-11-26 Rocket Power Inc Thruster
US3245591A (en) * 1964-02-20 1966-04-12 Crown Cork & Seal Co Dispensing piston can
US3502002A (en) * 1968-04-02 1970-03-24 Whiteman Mfg Co Means for synchronizing a pair of hydraulic power cylinder actuators

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995535A (en) * 1975-05-23 1976-12-07 Russell Ozechowski Expansible chamber device
US4452126A (en) * 1981-05-05 1984-06-05 Mitko Tomov Pneumatic drive
US6978711B1 (en) * 1999-04-22 2005-12-27 Van Der Blom Nicolaas Combination of a chamber and a piston, a pump, a motor, a shock absorber and a transducer incorporating the combination
US20060032370A1 (en) * 1999-04-22 2006-02-16 Nvb Composites International A/S Combination of a chamber and a piston, a pump, a motor, a shock absorber and a transducer incorporating the combination
US20100170391A1 (en) * 1999-04-22 2010-07-08 Nvb Composites International A/S Combination of a chamber and a piston, a pump, a motor, a shock absorber and transducer incorporating the combination
US8127660B2 (en) * 1999-04-22 2012-03-06 Nicolaas Van Der Blom Combination of a chamber and a piston, a pump, a motor, a shock absorber and transducer incorporating the combination
US20080006147A1 (en) * 2002-05-24 2008-01-10 Blom Nicolaas V D Device comprising a combination of a chamber and a piston
US7461582B2 (en) * 2002-05-24 2008-12-09 Van Der Blom Nicolaas Device comprising a combination of a chamber and a piston
EP2884089A1 (de) * 2013-12-10 2015-06-17 Robert Bosch Gmbh Hydraulischer Koppler

Also Published As

Publication number Publication date
IT990983B (it) 1975-07-10
FR2192617A5 (xx) 1974-02-08
DE2237659A1 (de) 1974-01-24
CH547008A (de) 1974-03-15
GB1414054A (en) 1975-11-12

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