GB708920A - Improvements in lifting jacks - Google Patents
Improvements in lifting jacksInfo
- Publication number
- GB708920A GB708920A GB425451A GB425451A GB708920A GB 708920 A GB708920 A GB 708920A GB 425451 A GB425451 A GB 425451A GB 425451 A GB425451 A GB 425451A GB 708920 A GB708920 A GB 708920A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crutch
- screw
- bipod
- lifting
- shank
- 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
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F13/00—Common constructional features or accessories
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Rehabilitation Tools (AREA)
Abstract
708,920. Lifting jacks. METALLIFACTURE, Ltd., and PICKERELL, A. W. March 10, 1952 [Feb. 21, 1951], No. 4254/51. Class 78 (3) A lifting jack comprises a bipod support structure having downwardly diverging legs, a shank supported from the apex of the bipod, a lifting dog associated with the shank, means for causing vertical displacement of the lifting dog, and means to permit the shank and lifting dog to swing transversely to the plane of the bipod. As shown in Fig. 1 a bearing member 6 on a screw 7 is supported on a part spherical seat member 5, welded to the top of bipod legs 1, and the screw is rotatable by a handle 10 and ratchet gearing in the head 8. For rapid adjustment the ratchet gearing may be immobilized by movement of the pawl reversing arm 12, and the screw may be rotated by means of a knurled knob 13. According to a modification, this operating mechanism is located at the bottom end of screw 7. The crutch comprises a nut 14 and a pivoted bar 17 adapted to engage a socket on the load. In a modification (not shown) a ratchet bar, having a ball and socket connection with the member 5, has a crutch movable therealong by interaction of a pair of pawls which are pivoted to the crutch and are operated by a manually operable lever, to produce up or down crutch movement. In a further modification a pawl mechanism secured to the member 5 moves a ratchet bar, carrying the crutch, up and down.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB425451A GB708920A (en) | 1951-02-21 | 1951-02-21 | Improvements in lifting jacks |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB425451A GB708920A (en) | 1951-02-21 | 1951-02-21 | Improvements in lifting jacks |
Publications (1)
Publication Number | Publication Date |
---|---|
GB708920A true GB708920A (en) | 1954-05-12 |
Family
ID=9773644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB425451A Expired GB708920A (en) | 1951-02-21 | 1951-02-21 | Improvements in lifting jacks |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB708920A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105036021A (en) * | 2015-09-08 | 2015-11-11 | 苏州瑞美科材料科技有限公司 | Lifting mechanism |
-
1951
- 1951-02-21 GB GB425451A patent/GB708920A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105036021A (en) * | 2015-09-08 | 2015-11-11 | 苏州瑞美科材料科技有限公司 | Lifting mechanism |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB708920A (en) | Improvements in lifting jacks | |
US2217403A (en) | Jack | |
GB671911A (en) | Improvements relating to lifting jacks | |
GB724512A (en) | Improvements in and relating to platform lifting appliances | |
GB661043A (en) | Improvements in or relating to ratchet mechanisms more particularly for spanners andthe like | |
GB1322426A (en) | Load lifting jacks | |
US2150831A (en) | Jack | |
GB805906A (en) | Vertical adjustable seat operated by jack mechanism | |
GB697611A (en) | Improvements in or relating to vices | |
US2648985A (en) | Hoisting and stretching apparatus | |
JPS5821610Y2 (en) | pipe cutter | |
US1946242A (en) | Lifting jack | |
GB303993A (en) | Improvements in or relating to lifting jacks | |
GB865130A (en) | Screw jack | |
US983359A (en) | Ratchet device for lifting-jacks. | |
US3627269A (en) | Vehicle bumper jack and conversion kit | |
US2758486A (en) | Control mechanism | |
US1424748A (en) | Lifting jack | |
GB851556A (en) | Improved pile or column raising and lowering apparatus | |
GB702346A (en) | Improvements in or relating to lifting jacks | |
GB1387789A (en) | Lifting truck having a control member adjustable into three different positions | |
JPS586868Y2 (en) | Pantograph type jack | |
GB1423344A (en) | Hoist | |
GB681520A (en) | Lifting jack with swinging footplates | |
GB691405A (en) | Improvements in or relating to yokes or like retaining devices |