GB687489A - Improvements in or relating to block-and-tackle lifting devices - Google Patents
Improvements in or relating to block-and-tackle lifting devicesInfo
- Publication number
- GB687489A GB687489A GB3039249A GB3039249A GB687489A GB 687489 A GB687489 A GB 687489A GB 3039249 A GB3039249 A GB 3039249A GB 3039249 A GB3039249 A GB 3039249A GB 687489 A GB687489 A GB 687489A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chain
- tube
- block
- tackle
- spill
- 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
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D3/00—Portable or mobile lifting or hauling appliances
- B66D3/12—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
- Transmission Devices (AREA)
Abstract
687,489. Pulley hoists. DIDSBURY ENGINEERING CO., Ltd., and FRANKS, A. L. Nov. 27, 1950..[Nov. 28, 1949] No. 30392/49. Class 78 (v). In a portable block and tackle lifting-device of the kind in which a standing block suspended from an overhead support is united to the upper end of a column having at its lower end a manually rotatable member for pulling the running end of the tackle, the running end of a roller chain tackle engages with a winding sprocket and the surplus chain is accommodated in a spill tank united to the said column with its open end adjacent the standing block. The sprockets are arranged as shown in Fig. 9. The sprockets 21 and 37 are mounted in a standing block 19, and the sprockets 17 within the running block. The chain passes over two jockey pulleys 35, 36. The free ends of the chain are anchored at 22 and 41. The chain 18 passes through a guide tube 40 into a spill tube 24 which is integral with a tube 40 into a spill tube 24 which is integral with a tube 12 along which the chain passes. At the lower end of the spill tube spaced plates 28 are bolted within an outer casing 23. The chain passes round a sprocket 34, which is driven through reduction gearing from any of the shafts 32, 45 or 50. A brake drum 55 is mounted on the shaft 50. Internally expanding shoes mounted on the shaft are held together by springs and operated through linkage connected to a lever 66. A set of rollers 69 act between a shoulder 70, and a ratchet ring 71 fixed to the sprocket 51 so that the drum can free wheel. The rate of descent when the brake is off is governor controlled. Two arcuate shoes 74 connected by springs 75 are mounted on pins 73 on a back plate 72 and at the critical speed, move radially and angularly to engage a drum fixed to the side plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3039249A GB687489A (en) | 1949-11-28 | 1949-11-28 | Improvements in or relating to block-and-tackle lifting devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3039249A GB687489A (en) | 1949-11-28 | 1949-11-28 | Improvements in or relating to block-and-tackle lifting devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB687489A true GB687489A (en) | 1953-02-18 |
Family
ID=10306944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3039249A Expired GB687489A (en) | 1949-11-28 | 1949-11-28 | Improvements in or relating to block-and-tackle lifting devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB687489A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2184991A (en) * | 1985-11-20 | 1987-07-08 | Yang Tai Her | Lifting apparatus |
CN106986279A (en) * | 2017-04-17 | 2017-07-28 | 维多利科技(江苏)有限公司 | A kind of braking clutch structure of Lever Blocks |
-
1949
- 1949-11-28 GB GB3039249A patent/GB687489A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2184991A (en) * | 1985-11-20 | 1987-07-08 | Yang Tai Her | Lifting apparatus |
CN106986279A (en) * | 2017-04-17 | 2017-07-28 | 维多利科技(江苏)有限公司 | A kind of braking clutch structure of Lever Blocks |
CN106986279B (en) * | 2017-04-17 | 2018-09-28 | 维多利科技(江苏)有限公司 | A kind of braking clutch structure of Lever Blocks |
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