GB179663A - Improvements in grabs, excavators and similar apparatus - Google Patents
Improvements in grabs, excavators and similar apparatusInfo
- Publication number
- GB179663A GB179663A GB486021A GB486021A GB179663A GB 179663 A GB179663 A GB 179663A GB 486021 A GB486021 A GB 486021A GB 486021 A GB486021 A GB 486021A GB 179663 A GB179663 A GB 179663A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grab
- lever
- chain
- upper block
- weight
- 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
-
- 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)
- Load-Engaging Elements For Cranes (AREA)
Abstract
179,663. Richardson, H. Feb. 11, 1921. Grab-buckets.-A grab comprises a frame A with vertical guide-bars a for sliding blocks b, c, the upper block b being attached to the hoisting- chain H and the lower block c being connected by links d to the buckets. For closing the buckets and holding them closed while lifting, the two blocks are locked together by levers e on the lower block which project through a central opening in the upper block and may be spread apart by a weighted discharging-lever g pivoted on the upper block. When used as a double chain grab, a bell-crank lever l operated by a chain K, is provided on the grab head for actuating the lever g against the resistance of a spring, or the opening chain may be attached directly to the lever g for hand dumping. When used as a single-chain grab, the lever g is provided with a hook for engaging the suspension ring; a counterweight k holds the lever with the hook clear of the ring for lowering open grab. The singlechain-grab may be discharged by dumping; when the closed grab rests on the ground the upper block b is relieved of the weight, the lever g is freed from the grip of the members e, e and is turned by the weight k into the discharging position shown in chain lines in Fig. 1, so that the grab is free to open on hauling in the lifting chain grab may be discharged by dumping; when charged by a hand line attached to the lever g. The operation of closing the grab is the same whether operating on the single or double-chain principle. When the open grab is grounded the upper block b falls in the guides a, and passes over the members e, e. At the same time the weight k rests on the bottom of its guides, and the lever g is free to fall by gravity into the horizontal or locking position, where it is held by the grip of the members e, e as soon as the weight is taken by the upper block.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB486021A GB179663A (en) | 1921-02-11 | 1921-02-11 | Improvements in grabs, excavators and similar apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB486021A GB179663A (en) | 1921-02-11 | 1921-02-11 | Improvements in grabs, excavators and similar apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB179663A true GB179663A (en) | 1922-05-11 |
Family
ID=9785161
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB486021A Expired GB179663A (en) | 1921-02-11 | 1921-02-11 | Improvements in grabs, excavators and similar apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB179663A (en) |
-
1921
- 1921-02-11 GB GB486021A patent/GB179663A/en not_active Expired
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