GB251711A - Improvements in or relating to grabs and the like - Google Patents
Improvements in or relating to grabs and the likeInfo
- Publication number
- GB251711A GB251711A GB435025A GB435025A GB251711A GB 251711 A GB251711 A GB 251711A GB 435025 A GB435025 A GB 435025A GB 435025 A GB435025 A GB 435025A GB 251711 A GB251711 A GB 251711A
- Authority
- GB
- United Kingdom
- Prior art keywords
- block
- latch
- grab
- buckets
- cross
- 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
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
- B66C3/06—Grabs actuated by a single rope or chain
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
251,711. Sedgwick, C. H. Feb. 17, 1925. Grab-buckets.-Relates to grabs of the kind in which the lower pulley-block e moves between the grab-head d and the cross-beam b to which the buckets a are hinged, and the block e is connected to the cross-beam by latch mechanism which is engaged and disengaged automatically to permit the closing and opening of the buckets. The block e moves on a central telescopic guide comprising a rod j carried centrally on the grabhead, and two sleeves k, l attached respectively to the pulley-block e and the cross-beam b. A cylindrical latch-block h is attached to the sleeve l which is mounted in the cross-beam so as to be free to turn about its own axis. The latch-block h has wedge-surfaces i co-operating with rollers g on the pulley-block e. The pulley-block carries sheaves n arranged as shown in plan in Fig. 4 for the single hoisting and operating chain m. The latch-block h tends to turn to the position in which the wedges i will not engage the rollers g, under the action of a torsion spring s acting on the spindle o and bevel gears p. When the buckets open, the hinge pin a<1> which is secured to one of them turns the spindle o, through a oneway drive r, so as to bring the latch block h to the position shown and put the spring s under torsional strain. When the pulley-block e is then lowered, the rollers g engage the wedge-surfaces i, the block twisting on the telescopic guides until the rollers swing back under the wedges i which then lock the block to the cross-beam. On hauling in the chain, the buckets are closed, the hinge pin a<1> moving so that the drive r will not obstruct the action of the spring s in releasing the latch when the grab is again lowered to the ground or raised to engage with a suspended ring r. To open the grab by dumping, it is lowered to the ground and the chain slackened. When pressure between the parts g, i is relieved, the latch-piece h is turned by the spring s so that on hauling in the chain, the rollers g rise clear of the wedge i and the buckets are opened as far as is permitted by a stop on the cross-beam. To open the grab at the top of the lift. it is raised until the suspended ring v engages and depresses a rod u in the grab-head, acting on a slider t in the pulleyblock having a wedge-shaped end t<1> to engage and turn the latch-block. The chain m passes through a guiding sleeve m<1> having its mouth nearly in line with the pivots c<1> of the links c, so as to reduce the strains on the parts when the grab rests on the dump in an inclined position.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB435025A GB251711A (en) | 1925-02-17 | 1925-02-17 | Improvements in or relating to grabs and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB435025A GB251711A (en) | 1925-02-17 | 1925-02-17 | Improvements in or relating to grabs and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
GB251711A true GB251711A (en) | 1926-05-13 |
Family
ID=9775508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB435025A Expired GB251711A (en) | 1925-02-17 | 1925-02-17 | Improvements in or relating to grabs and the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB251711A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017055891A1 (en) * | 2015-09-29 | 2017-04-06 | Arben Hidri | A bucket for handling bulk materials |
CN118125298A (en) * | 2024-04-19 | 2024-06-04 | 临沂钢铁投资集团特钢有限公司 | Lifting sling for converter steelmaking and control method thereof |
-
1925
- 1925-02-17 GB GB435025A patent/GB251711A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017055891A1 (en) * | 2015-09-29 | 2017-04-06 | Arben Hidri | A bucket for handling bulk materials |
CN118125298A (en) * | 2024-04-19 | 2024-06-04 | 临沂钢铁投资集团特钢有限公司 | Lifting sling for converter steelmaking and control method thereof |
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