GB690083A - Improvements relating to grabs - Google Patents
Improvements relating to grabsInfo
- Publication number
- GB690083A GB690083A GB3140850A GB3140850A GB690083A GB 690083 A GB690083 A GB 690083A GB 3140850 A GB3140850 A GB 3140850A GB 3140850 A GB3140850 A GB 3140850A GB 690083 A GB690083 A GB 690083A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pivoted
- catch
- pin
- arms
- grab
- 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)
- Load-Engaging Elements For Cranes (AREA)
Abstract
690,083. Grab-buckets. PRIESTMAN BROS., Ltd. Dec. 3, 1951. [Dec. 27, 1950] No. 31408/50. Class 78 (iv). In a single rope grab in which the bucket sections are opened by hand or by dumping, part of the mechanism for closing and locking the bucket sections is mounted on a cross beam on which the bucket sections are pivoted and part, a claw shaped hook and catch, on an arm pivotally mounted on members secured to the jaw supporting arms. The bucket sections 1, 2 are pivoted on pins 3 on a cross-beam 4 and are supported by arms 5 and 6 pivoted to a pin 8 and welded to the block 7 respectively. The locking mechanism comprises two hooks 22 pivoted at 23 to members 16 pivoted at 20 to arms 18 secured to the arms 6 and a catch 25 pivoted at 26 to the hook which are held engaged with a cylindrical member 39 mounted on the cross-beam. The hooks are held in engagement by an arm 29 which has a pin 30 engaging in a slot 31 in the member 16 and a roller 32 engaging tracks 33. The pin 30 is held at the end of the slot by the nose 40 of a member 41 pivoted to the member 16 and which hangs under gravity with the pin 43 engaging in the upper end of slot 44. The catch 25 has a tail 36 engaged by a weighted lever 34 which tends to disengage it but is prevented by friction between the catch and member 39. The hauling rope 12 is secured to the grab at 17 and passes round pulleys 14 on the members 16 so that when the grab is dumped the members 16 are lowered, a part 45 on member 41 strikes the member 39 and releases the pin 30 which slides along the slot 31 and releases the arm 29 restraining the hook to one side of the member 39 and the member 34 strikes the tail 36 to release the catch. When the rope is hauled in the arms 16 are raised and hooks and catch re-engage with the member 39. To release the buckets by hand a trip rope is secured to a member 48 having a weighted lever pivoted to the cross beam, a sharp pull on the trip rope causes the weighted end 49 to strike the catch and release it from the member 39.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3140850A GB690083A (en) | 1950-12-27 | 1950-12-27 | Improvements relating to grabs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3140850A GB690083A (en) | 1950-12-27 | 1950-12-27 | Improvements relating to grabs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB690083A true GB690083A (en) | 1953-04-08 |
Family
ID=10322666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3140850A Expired GB690083A (en) | 1950-12-27 | 1950-12-27 | Improvements relating to grabs |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB690083A (en) |
-
1950
- 1950-12-27 GB GB3140850A patent/GB690083A/en not_active Expired
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