GB927355A - Improvements relating to hydraulic power lifting means for tractors - Google Patents
Improvements relating to hydraulic power lifting means for tractorsInfo
- Publication number
- GB927355A GB927355A GB1989658A GB1989658A GB927355A GB 927355 A GB927355 A GB 927355A GB 1989658 A GB1989658 A GB 1989658A GB 1989658 A GB1989658 A GB 1989658A GB 927355 A GB927355 A GB 927355A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve member
- shaft
- jack
- secured
- casing
- 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
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
- A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
- A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
- A01B63/1006—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means the hydraulic or pneumatic means structurally belonging to the tractor
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Abstract
927,355. Tractor power-lift mechanisms. FAIREY CO. Ltd. Sept. 18, 1959 [June 20, 1958], No. 19896/58. Class 79(1) In a hydraulic power lift mechanism with a pair of spaced parallel lifting arms 23, 24 pivoted about a common transverse horizontal axis at the rear of the vehicle, the jack 10 is of the rotating vane type with the vane 13 or vanes carried by a shaft 21 which protrudes from the jack casing 11, the lifting arms 23, 24 being secured to either the shaft or the casing. In the preferred embodiment, the arms are secured to the shaft and the casing to the vehicle, the spaces at opposite sides of the vane 13 being connected by passages 32, 33 to pairs of ports in the end face of a follow-up valve member 38 secured to the shaft 21. This valve member cooperates with an input valve member 37 having a pair of ports surrounded by accurate bearing pads and connected to an inlet P while a second pair of ports surrounded by recesses are connected to a return line R. When the valve member 37 is rotated by a hand lever 61 and a linkage 40 fluid is supplied to the jack until the valve member 38 has been restored to its original position in relation to the valve member 37. A pocket 49 causes the fluid pressure to bias the member 37 towards the member 38, a thrust race being provided for the shaft 21. In the event of an overload, for example due to an obstruction, a spring-loaded rod 72 connected to the implement displaces the fulcrum 62 of the hand lever 61 which is thus swung about a friction pad 71 normally displaceable in a quadrant 70 to operate the valve members and raise the implement. When the overload ceases, the rod 72 is returned to its normal position by its spring. The jack is constructed as described in Specification 893,361.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1989658A GB927355A (en) | 1958-06-20 | 1958-06-20 | Improvements relating to hydraulic power lifting means for tractors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1989658A GB927355A (en) | 1958-06-20 | 1958-06-20 | Improvements relating to hydraulic power lifting means for tractors |
Publications (1)
Publication Number | Publication Date |
---|---|
GB927355A true GB927355A (en) | 1963-05-29 |
Family
ID=10136966
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1989658A Expired GB927355A (en) | 1958-06-20 | 1958-06-20 | Improvements relating to hydraulic power lifting means for tractors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB927355A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3308721A (en) * | 1965-04-06 | 1967-03-14 | Kawasaki Heavy Ind Ltd | Hydraulic rotary servo mechanism |
US3417667A (en) * | 1965-11-10 | 1968-12-24 | Fujitsu Ltd | Oil pressure torque amplifier |
-
1958
- 1958-06-20 GB GB1989658A patent/GB927355A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3308721A (en) * | 1965-04-06 | 1967-03-14 | Kawasaki Heavy Ind Ltd | Hydraulic rotary servo mechanism |
US3417667A (en) * | 1965-11-10 | 1968-12-24 | Fujitsu Ltd | Oil pressure torque amplifier |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3015344A (en) | Hydraulic control valve | |
GB1468872A (en) | ||
GB927355A (en) | Improvements relating to hydraulic power lifting means for tractors | |
GB994992A (en) | Improvements in or relating to power lift systems | |
GB917539A (en) | Improvements in or relating to tractors | |
US2524682A (en) | Pressure fluid power amplifier | |
SE328775B (en) | ||
GB834735A (en) | Control arrangement for tractors | |
GB962615A (en) | Improvements in or relating to tractors or the like vehicles having an additional wheel set | |
GB730561A (en) | Improvements in or relating to hydraulic jacks | |
GB865422A (en) | Improvements in or relating to hydraulic control valves | |
GB922428A (en) | Tractor hydraulic system | |
GB937032A (en) | Improvements in and relating to fluid control valves | |
GB865785A (en) | Improvements in or relating to control devices for hydraulic equipment | |
US3007447A (en) | Improvements in hydraulic lift systems | |
US2680401A (en) | Multiple-circuit hydraulic control with optional separate or parallel operation | |
US2944559A (en) | Linear positioning servo mechanism | |
GB909906A (en) | Hydraulic control system for variable displacement pump | |
GB1372892A (en) | Hydraulic lifting system | |
GB1282419A (en) | Improvements in hydraulic control systems and valves therefor | |
GB1194880A (en) | Improvements in or relating to tractor power lifts | |
GB1069462A (en) | Improvements in or relating to hydraulic lifting devices for tractors | |
GB639146A (en) | Improvements in or relating to hydraulic power lift systems for tractors or the like | |
GB926257A (en) | Hydraulic power lift mechanism for agricultural tractors | |
GB897500A (en) | Pressure-sensitive valves |