GB232043A - Improvements relating to grab dredgers - Google Patents
Improvements relating to grab dredgersInfo
- Publication number
- GB232043A GB232043A GB1034324A GB1034324A GB232043A GB 232043 A GB232043 A GB 232043A GB 1034324 A GB1034324 A GB 1034324A GB 1034324 A GB1034324 A GB 1034324A GB 232043 A GB232043 A GB 232043A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grab
- weight
- ropes
- drums
- pulleys
- 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
- B66C3/12—Grabs actuated by two or more ropes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jib Cranes (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
232,043. Priestman, S. H. April 26, 1924. Grab machines. - A grab dredger adapted to leave a flat surface has check ropes attached to the lower axis of the grab and to a sliding weight working in fixed guides, preferably part of or secured to the framework of the crane, so that the dredger excavates to a predetermined depth. In Fig. 1, an opening rope 37 is connected to the grab and a hoisting rope 1 passes over a pulley 2 to a drum 5, ropes 8 passing oppositelv round smaller drums and being fixed to the grab head; the grab closes when the hoisting rope is drawn in, owing to winding of the ropes 8 on their drums, while when the load is taken by the rope 37 the grab opens. Check ropes 10 pass from the lower axle of the grab over a jib pulley 3 and pulleys 15 on a structure 17, then over pulleys 23 on a weight 22 sliding in the structure 17, and then over pulleys coaxial with the pulleys 15 to ratchet-controlled drums 27; on lowering the grab, the weight rises, descent of the grab being limited by contact of spring buffers on the weight 22 with buffer stops in the structure 17. A scale and pointer are provided. in a modification, the weight slides along the jib 14 and the ratchet drums 27 are mounted in the weight. In Fig. 5, the check ropes pass round drums 38, 39 on the grab to be wound on during closing of the grab and thereby lift the grab, so providing a wider and shallower cut; this effect is increased by providing long hinge arms 43 on the grab.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1034324A GB232043A (en) | 1924-04-26 | 1924-04-26 | Improvements relating to grab dredgers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1034324A GB232043A (en) | 1924-04-26 | 1924-04-26 | Improvements relating to grab dredgers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB232043A true GB232043A (en) | 1925-04-16 |
Family
ID=9966092
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1034324A Expired GB232043A (en) | 1924-04-26 | 1924-04-26 | Improvements relating to grab dredgers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB232043A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015023177A1 (en) | 2013-08-14 | 2015-02-19 | Lely Patent N.V. | Wear-resistant livestock feed gripping jaw |
-
1924
- 1924-04-26 GB GB1034324A patent/GB232043A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015023177A1 (en) | 2013-08-14 | 2015-02-19 | Lely Patent N.V. | Wear-resistant livestock feed gripping jaw |
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