GB1426358A - Hydraulic self-levelling device for a boom-mounted bucket - Google Patents
Hydraulic self-levelling device for a boom-mounted bucketInfo
- Publication number
- GB1426358A GB1426358A GB1963573A GB1963573A GB1426358A GB 1426358 A GB1426358 A GB 1426358A GB 1963573 A GB1963573 A GB 1963573A GB 1963573 A GB1963573 A GB 1963573A GB 1426358 A GB1426358 A GB 1426358A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spool
- valve
- port
- boom
- bucket
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
- E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
- E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
- E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Multiple-Way Valves (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
1426358 Fluid-pressure servomotor systems INTERNATIONAL HARVESTER CO 25 April 1973 [2 May 1972] 19635/73 Heading G3P [Also in Divisions El and F2] A control system for maintaining level a boom mounted bucket during raising of the boom is generally similar to that described in Specification 1426357 except that when spool valve port 28, Fig. 2, is opened the fluid from side 31 of bucket ram 20 is exhausted to drain via passages 104, 74 in spool 16 rather than being recirculated through port 30 to the other side of the ram. In addition the system includes a priority valve which prevents accidental rollback of the bucket whilst the boom is within a predetermined height range. In one arrangement, Fig. 3, the priority valve 118 includes a shuttle spool 128 biased rightwards within bore 126 by spring 138 to a position in which the spool interior 138 communicates via ports 130, 120 with line 40 of manual valve 18. A restriction 134 also connects spool interior 138 to port 28 of self levelling spool valve 10. Thus as soon as port 28 opens to drain upon movement of spool 16 of valve 10, the pressure drop across restriction 134 causes shuttle spool 128 to move leftwards to cut-off port 120. Thus accidental operation of valve 18 cannot cause high-pressure fluid to flow through line 40 to rollback bucket ram 20 during the self levelling phase. Fig. 4 (not shown) illustrates a modified priority valve.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US24964172A | 1972-05-02 | 1972-05-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1426358A true GB1426358A (en) | 1976-02-25 |
Family
ID=22944373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1963573A Expired GB1426358A (en) | 1972-05-02 | 1973-04-25 | Hydraulic self-levelling device for a boom-mounted bucket |
Country Status (5)
Country | Link |
---|---|
US (1) | US3794199A (en) |
JP (1) | JPS5736375B2 (en) |
AU (1) | AU451239B2 (en) |
CA (1) | CA963354A (en) |
GB (1) | GB1426358A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102619241A (en) * | 2012-01-12 | 2012-08-01 | 广西大学 | Space-controllable mechanism type loader |
CN103046590A (en) * | 2013-01-30 | 2013-04-17 | 江苏柳工机械有限公司 | Control method of hydraulic working system of loading machine |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4928360A (en) * | 1972-07-05 | 1974-03-13 | ||
US4372729A (en) * | 1980-07-21 | 1983-02-08 | Veda, Inc. | Tilt control |
US4844685A (en) * | 1986-09-03 | 1989-07-04 | Clark Equipment Company | Electronic bucket positioning and control system |
US5501570A (en) * | 1994-01-21 | 1996-03-26 | Case Corporation | Anti-rollback mechanism for a loader mechanism of an off-highway implement |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3521781A (en) * | 1968-09-26 | 1970-07-28 | Case Co J I | Anti-rollback mechanism |
US3568869A (en) * | 1969-01-09 | 1971-03-09 | Case Co J I | Antirollback mechanism |
US3695474A (en) * | 1970-08-05 | 1972-10-03 | Case Co J I | Hydraulic control linkage for implement |
-
1972
- 1972-05-02 US US00249641A patent/US3794199A/en not_active Expired - Lifetime
- 1972-11-14 CA CA156,372A patent/CA963354A/en not_active Expired
- 1972-12-28 AU AU50526/72A patent/AU451239B2/en not_active Expired
-
1973
- 1973-04-11 JP JP4121773A patent/JPS5736375B2/ja not_active Expired
- 1973-04-25 GB GB1963573A patent/GB1426358A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102619241A (en) * | 2012-01-12 | 2012-08-01 | 广西大学 | Space-controllable mechanism type loader |
CN102619241B (en) * | 2012-01-12 | 2014-06-25 | 广西大学 | Space-controllable mechanism type loader |
CN103046590A (en) * | 2013-01-30 | 2013-04-17 | 江苏柳工机械有限公司 | Control method of hydraulic working system of loading machine |
Also Published As
Publication number | Publication date |
---|---|
DE2322094A1 (en) | 1973-11-08 |
JPS5736375B2 (en) | 1982-08-03 |
DE2322094B2 (en) | 1976-05-26 |
US3794199A (en) | 1974-02-26 |
AU5052672A (en) | 1974-07-04 |
JPS4921901A (en) | 1974-02-26 |
AU451239B2 (en) | 1974-07-15 |
CA963354A (en) | 1975-02-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |