GB485617A - Improvements in or relating to jacks, more particularly for retractable undercarriages for aircraft - Google Patents
Improvements in or relating to jacks, more particularly for retractable undercarriages for aircraftInfo
- Publication number
- GB485617A GB485617A GB3115936A GB3115936A GB485617A GB 485617 A GB485617 A GB 485617A GB 3115936 A GB3115936 A GB 3115936A GB 3115936 A GB3115936 A GB 3115936A GB 485617 A GB485617 A GB 485617A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- pressure
- gas
- jack
- fluid
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C25/00—Alighting gear
- B64C25/02—Undercarriages
- B64C25/08—Undercarriages non-fixed, e.g. jettisonable
- B64C25/10—Undercarriages non-fixed, e.g. jettisonable retractable, foldable, or the like
- B64C25/18—Operating mechanisms
- B64C25/22—Operating mechanisms fluid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
Abstract
485,617. Fluid-pressure jacks. ONIONS, J. H., and AUTOMOTIVE PRODUCTS CO., Ltd. Nov. 14, 1936, Nos. 31159 /36 and 27577/37. [Class 78 (iii)] [Also in Groups XXVIII, XXIX, and XXXIII] In fluid-pressure jacks of the kind comprising a cylinder and plunger constituting a pulling and pushing connection between a pair of relatively movable members, the movement of the plunger relative to the cylinder, produced in one direction by liquid or gaseous pressure from an external source, compresses gas contained in a closed chamber or chambers within the jack thereby storing up energy for moving the plunger in the opposite direction. Means may be provided for returning the plunger by externally supplied fluid pressure in the event of loss or leakage of the stored energy. The invention is particularly applicable to jacks for operating retractable undercarriages, landing flaps, bomb hoists, fairing doors, movable fairings for gun turrets &c. on aircraft. As shown in Fig. 1, the jack cylinder comprises a tubular part 10 with heads 11, 12 secured therein by screws 13. The plunger 16 is secured to a hollow stem 15 passing through the head 12, the inner end 15a of the stem forming a stop to limit the compression and the outer end being closed by a plug 22 which may be adjustable to vary the internal volume. A connection 20 provides for supply of fluid under pressure to contract the jack and a valve 21 enables the initial pressure in the closed chamber A to be regulated. Sealing washers are provided as shown and terminal fittings 23a, 24a provide for attachment to the members to be operated, the arrangement being that, when the jack is operated in one direction by fluid pressure in the chamber B, the gas in chamber A is compressed to provide the restoring means when the fluid pressure in chamber B is relieved. Several variations of the internal arrangement are described. In Fig. 2, the chamber A is connected to the external fluid supply, the chamber B containing gas and communicating by an opening 26 with the chamber C in the hollow plunger stem. In Fig. 4, a fixed piston 40, carried by a rod 41 attached to the cylinder head 42, operates in the plunger stem which slides thereon, the chamber E, so formed, communicating with the chamber D by a passage 45 and the gas being stored in the chambers F, G. Alternatively gas may be enclosed in the chambers D, E, fluid pressure being applied to the chambers F, G. To enable the return stroke to be performed by admission of external fluid pressure in the event of failure of the compressed gas, the two gas chambers D, E or F, G, as the case may be, are dissociated, one being retained as a closed chamber, the other being connected to an external source of pressure for use as required. For example, in Fig. 8, the jack is extended by fluid pressure supplied to the chambers D, E, gas compressed in the chamber F provides the restoring force, and the chamber G is connected to an outside source of supply by a passage 63, for use in emergency. Variations of this arrangement are described and illustrated. A form is also described in which the jack cylinder contains a pair of opposed plungers with oppositely projecting hollow stems connected to the two relatively movable members to be operated. Fig. 12 shows a liquid pressure operating system for controlling a jack in which the pressure fluid is admitted to the chambers F, G, gas is compressed in the chamber E to provide the restoring force and, in case this fails, the chamber D is connected to the external supply which is delivered thereto as required. A pump 82 draws liquid from a reservoir 83 and feeds it to a control valve 84 with outlets connected to the two ends of a locking valve 85 from which pipes 86, 87 lead to the respective chambers F and D. In the central position of the valve piston the openings 97, 100 to the pipes are sealed so that the jack is locked in position. If liquid from the valve 84 is admitted to the right-hand end of the valve casing 85, movement of the piston 90 firstly opens the pipe 87 to a space 94, allowing return of any liquid in the chamber D to the reservoir through an opening 101 in the piston, and subsequently uncovers the pipe 86 to admit pressure fluid to the chamber F, G. In the opposite process, the pipe 86 is first opened to the return space 94, allowing expansion of the gas in the chamber E, the pipe 87 being connected to the reservoir 83 by a lightly loaded one-way valve 103 to avoid production of a vacuum in the chamber D. If the air pressure in chamber E is insufficient to extend the jack, the pump will supply liquid through the port 100 to the chamber D. Specifications 425,207 and 481,449, [both in Group XXXIII], are referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3115936A GB485617A (en) | 1936-11-14 | 1936-11-14 | Improvements in or relating to jacks, more particularly for retractable undercarriages for aircraft |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3115936A GB485617A (en) | 1936-11-14 | 1936-11-14 | Improvements in or relating to jacks, more particularly for retractable undercarriages for aircraft |
Publications (1)
Publication Number | Publication Date |
---|---|
GB485617A true GB485617A (en) | 1938-05-16 |
Family
ID=10318900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3115936A Expired GB485617A (en) | 1936-11-14 | 1936-11-14 | Improvements in or relating to jacks, more particularly for retractable undercarriages for aircraft |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB485617A (en) |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2452176A (en) * | 1945-03-14 | 1948-10-26 | Westinghouse Air Brake Co | Fluid pressure controlled actuator |
US2547309A (en) * | 1946-04-22 | 1951-04-03 | William B Elmer | Pneumatically actuated operator for removing rip covers from tanks |
US2564285A (en) * | 1948-03-11 | 1951-08-14 | Samuel V Smith | Pneumatic-hydraulic system for operating well pumping equipment |
US2644307A (en) * | 1950-01-10 | 1953-07-07 | Blair Walter | Pneumatic hoist |
US2650574A (en) * | 1947-08-04 | 1953-09-01 | Donald A Macdonald | Fluid lift pumping equipment |
US2659348A (en) * | 1951-03-01 | 1953-11-17 | Wales Strippit Corp | Machine tool with liquid-spring actuated ram |
US2660984A (en) * | 1951-03-01 | 1953-12-01 | Wales Strippit Corp | Machine tool with liquid spring actuated ram |
US2671316A (en) * | 1949-04-28 | 1954-03-09 | M O Johnston | Hydraulic control system |
US2679827A (en) * | 1948-06-11 | 1954-06-01 | Electro Hydraulics Ltd | Combination fluid pressure motor and shock absorber |
US2697911A (en) * | 1948-03-24 | 1954-12-28 | Joy Mfg Co | Pulsating apparatus and shaker drives incorporating the same |
US2711634A (en) * | 1949-05-25 | 1955-06-28 | Joy Mfg Co | Mine roof supporting means |
US2827764A (en) * | 1955-12-13 | 1958-03-25 | L A Young Spring & Wire Corp | Power system for a drop hammer |
US2846983A (en) * | 1955-04-14 | 1958-08-12 | Johnson Service Co | Single acting motor with pneumatic return spring |
US2866442A (en) * | 1954-08-26 | 1958-12-30 | Nat Pneumatic Co Inc | Pressure motor with piston cushioning and speed control means |
US2925970A (en) * | 1953-11-06 | 1960-02-23 | Dehavilland Aircraft Canada | Retractable aircraft landing element mounting |
US3509723A (en) * | 1968-08-05 | 1970-05-05 | Arrow Mfg Co | Gas-powered impact hammer |
US3952632A (en) * | 1973-05-23 | 1976-04-27 | Ab Bofors | Device used as a power transmission component for elevation of a gun barrel |
GB2000227B (en) * | 1977-06-10 | 1982-02-24 | Jungheinrich Kg | Hydraulic lifting device |
US4667473A (en) * | 1983-09-26 | 1987-05-26 | Robinson Curtiss W | Low compensating accumulator and bungee |
GB2192029A (en) * | 1986-04-28 | 1987-12-31 | Bt Ind Ab | A hydraulic lifting arrangement |
EP1325854A2 (en) * | 2001-12-31 | 2003-07-09 | ROBERT BOSCH GmbH | Pneumatic actuator for testing a servo-motor |
FR2985556A1 (en) * | 2012-01-10 | 2013-07-12 | Serge Glasson | Device for adjusting height of plate of vehicle equipped with damped pneumatic suspension, has chamber connected to valve allowing communication of chamber with suspension to vary internal pressure of chamber, independently |
CN104709843A (en) * | 2015-02-12 | 2015-06-17 | 嘉善海力达工具有限公司 | Piston rod reset mechanism of jack and jack |
EP2148014A3 (en) * | 2008-07-24 | 2016-06-22 | Liebherr-Hydraulikbagger GmbH | Work device |
US20230257109A1 (en) * | 2022-02-16 | 2023-08-17 | Goodrich Corporation | Counterbalanced retract actuator for landing gear |
-
1936
- 1936-11-14 GB GB3115936A patent/GB485617A/en not_active Expired
Cited By (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2452176A (en) * | 1945-03-14 | 1948-10-26 | Westinghouse Air Brake Co | Fluid pressure controlled actuator |
US2547309A (en) * | 1946-04-22 | 1951-04-03 | William B Elmer | Pneumatically actuated operator for removing rip covers from tanks |
US2650574A (en) * | 1947-08-04 | 1953-09-01 | Donald A Macdonald | Fluid lift pumping equipment |
US2564285A (en) * | 1948-03-11 | 1951-08-14 | Samuel V Smith | Pneumatic-hydraulic system for operating well pumping equipment |
US2697911A (en) * | 1948-03-24 | 1954-12-28 | Joy Mfg Co | Pulsating apparatus and shaker drives incorporating the same |
US2679827A (en) * | 1948-06-11 | 1954-06-01 | Electro Hydraulics Ltd | Combination fluid pressure motor and shock absorber |
US2671316A (en) * | 1949-04-28 | 1954-03-09 | M O Johnston | Hydraulic control system |
US2711634A (en) * | 1949-05-25 | 1955-06-28 | Joy Mfg Co | Mine roof supporting means |
US2644307A (en) * | 1950-01-10 | 1953-07-07 | Blair Walter | Pneumatic hoist |
US2659348A (en) * | 1951-03-01 | 1953-11-17 | Wales Strippit Corp | Machine tool with liquid-spring actuated ram |
US2660984A (en) * | 1951-03-01 | 1953-12-01 | Wales Strippit Corp | Machine tool with liquid spring actuated ram |
US2925970A (en) * | 1953-11-06 | 1960-02-23 | Dehavilland Aircraft Canada | Retractable aircraft landing element mounting |
US2866442A (en) * | 1954-08-26 | 1958-12-30 | Nat Pneumatic Co Inc | Pressure motor with piston cushioning and speed control means |
US2846983A (en) * | 1955-04-14 | 1958-08-12 | Johnson Service Co | Single acting motor with pneumatic return spring |
US2827764A (en) * | 1955-12-13 | 1958-03-25 | L A Young Spring & Wire Corp | Power system for a drop hammer |
US3509723A (en) * | 1968-08-05 | 1970-05-05 | Arrow Mfg Co | Gas-powered impact hammer |
US3952632A (en) * | 1973-05-23 | 1976-04-27 | Ab Bofors | Device used as a power transmission component for elevation of a gun barrel |
GB2000227B (en) * | 1977-06-10 | 1982-02-24 | Jungheinrich Kg | Hydraulic lifting device |
US4667473A (en) * | 1983-09-26 | 1987-05-26 | Robinson Curtiss W | Low compensating accumulator and bungee |
GB2192029B (en) * | 1986-04-28 | 1990-05-23 | Bt Ind Ab | A hydraulic lifting arrangement |
GB2192029A (en) * | 1986-04-28 | 1987-12-31 | Bt Ind Ab | A hydraulic lifting arrangement |
EP1325854A2 (en) * | 2001-12-31 | 2003-07-09 | ROBERT BOSCH GmbH | Pneumatic actuator for testing a servo-motor |
EP1325854A3 (en) * | 2001-12-31 | 2010-06-30 | ROBERT BOSCH GmbH | Pneumatic actuator for testing a servo-motor |
EP2148014A3 (en) * | 2008-07-24 | 2016-06-22 | Liebherr-Hydraulikbagger GmbH | Work device |
FR2985556A1 (en) * | 2012-01-10 | 2013-07-12 | Serge Glasson | Device for adjusting height of plate of vehicle equipped with damped pneumatic suspension, has chamber connected to valve allowing communication of chamber with suspension to vary internal pressure of chamber, independently |
CN104709843A (en) * | 2015-02-12 | 2015-06-17 | 嘉善海力达工具有限公司 | Piston rod reset mechanism of jack and jack |
CN104709843B (en) * | 2015-02-12 | 2016-10-19 | 嘉善海力达工具有限公司 | The piston rod resetting-mechanism of jack and jack |
US20230257109A1 (en) * | 2022-02-16 | 2023-08-17 | Goodrich Corporation | Counterbalanced retract actuator for landing gear |
EP4230519A1 (en) * | 2022-02-16 | 2023-08-23 | Goodrich Corporation | Counterbalanced retract actuator for landing gear |
US12037105B2 (en) * | 2022-02-16 | 2024-07-16 | Goodrich Corporation | Counterbalanced retract actuator for landing gear |
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