GB1112975A - Improvements in or relating to jack devices - Google Patents
Improvements in or relating to jack devicesInfo
- Publication number
- GB1112975A GB1112975A GB2342965A GB2342965A GB1112975A GB 1112975 A GB1112975 A GB 1112975A GB 2342965 A GB2342965 A GB 2342965A GB 2342965 A GB2342965 A GB 2342965A GB 1112975 A GB1112975 A GB 1112975A
- Authority
- GB
- United Kingdom
- Prior art keywords
- unit
- frame
- column
- spring
- lever
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
- E04G11/20—Movable forms; Movable forms for moulding cylindrical, conical or hyperbolical structures; Templates serving as forms for positioning blocks or the like
- E04G11/22—Sliding forms raised continuously or step-by-step and being in contact with the poured concrete during raising and which are not anchored in the hardened concrete; Arrangements of lifting means therefor
- E04G11/24—Construction of lifting jacks or climbing rods for sliding forms
Abstract
1,112,975. Jack devices. JOHN LAING CONSTRUCTION Ltd. 18 May, 1966 [2 June, 1965], No. 23429/65. Heading B8J. [Also in Division E2] A jack device for raising loads, such as the sliding shuttering 5 used in continuous concrete pouring processes, in incremental steps along a vertical column 1, is of the kind comprising a frame 3 forming part of a yoke 4 supporting the shuttering 5 and a pair of vertically spaced gripping units 11, 12, each of which is adapted to grip the column 1 so as to permit upward movement of the unit along the column but to prevent downward movement. The upper unit 11 is substantially fixed with respect to the frame 3 and the lower unit 12 is slidable along the column 1 relatively to the upper unit 11 by a power-operated ram 31, which may be hydraulically or pneumatically operated. The unit 12 is coupled to a lever 29 pivoted at 30 to the frame 3 and the ram 31 is connected between the frame 3 and the end of the lever 29 remote from its pivot 30 so as to give a mechanical advantage affording at the unit 12 a force several times that exerted by the ram 31 at a location further from the longitudinal axis of the gripping units than the envelope of the load carried by the device. The unit 11 is resiliently mounted on the frame 3 being cushioned by a spring 25. A flanged stop 2 limits the height to which the device may climb. The lever 29 is biased by a spring 30 towards its return position, the movement being limited by an adjustable stop 35 used to control the lifting distance of a power stroke. A number of the devices may be set to climb together with the same lift on each power stroke. Each gripping unit 11, 12 comprises a conical housing 13 with six segmental jaws 14 acting radially to grip the column 1. A spring 19 urges the jaws 14 to the narrow end of the housing 13 to increase the wedging effect. The jaws 14 may be released by rotating a screwed tubular bush 26 to depress them against the action of the spring 19.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2342965A GB1112975A (en) | 1965-06-02 | 1965-06-02 | Improvements in or relating to jack devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2342965A GB1112975A (en) | 1965-06-02 | 1965-06-02 | Improvements in or relating to jack devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1112975A true GB1112975A (en) | 1968-05-08 |
Family
ID=10195470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2342965A Expired GB1112975A (en) | 1965-06-02 | 1965-06-02 | Improvements in or relating to jack devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1112975A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232985A (en) * | 2021-12-28 | 2022-03-25 | 广东科能工程管理有限公司 | Jacking stroke control method for sliding formwork construction of material silo |
| CN115354848A (en) * | 2022-07-12 | 2022-11-18 | 华中科技大学 | Climbing die carrier rolling limiting device and method capable of realizing real-time sensing and early warning of jacking force |
-
1965
- 1965-06-02 GB GB2342965A patent/GB1112975A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232985A (en) * | 2021-12-28 | 2022-03-25 | 广东科能工程管理有限公司 | Jacking stroke control method for sliding formwork construction of material silo |
| CN114232985B (en) * | 2021-12-28 | 2023-02-03 | 广东科能工程管理有限公司 | Jacking stroke control method for sliding formwork construction of material silo |
| CN115354848A (en) * | 2022-07-12 | 2022-11-18 | 华中科技大学 | Climbing die carrier rolling limiting device and method capable of realizing real-time sensing and early warning of jacking force |
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