GB840532A - Improvements in and relating to winches - Google Patents
Improvements in and relating to winchesInfo
- Publication number
- GB840532A GB840532A GB3910857A GB3910857A GB840532A GB 840532 A GB840532 A GB 840532A GB 3910857 A GB3910857 A GB 3910857A GB 3910857 A GB3910857 A GB 3910857A GB 840532 A GB840532 A GB 840532A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- drum
- load
- prevent
- trewhella
- 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
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/02—Driving gear
- B66D1/04—Driving gear manually operated
- B66D1/06—Safety cranks for preventing unwanted crank rotation and subsequent lowering of the loads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blinds (AREA)
Abstract
840,532. Hand winches. TREWHELLA BROS. PROPRIETARY Ltd., and TREWHELLA, B. H. Dec. 16, 1957, No. 39108/57. Class 78 (5). The winding drum 3 of a venetian blind is driven directly by handle 7 and at the same time is braked by spring 12. The spring is secured at one end to casing 1 fixed on a wall, and at the other end engages frictionally internal wall 14 of the drum. The braking effect is sufficient to prevent reverse rotation of the drum under the load of the blind, but not sufficient to prevent rotation by means of the handle. The load therefore on the end may be raised easily because the friction of the spring is diminished and when the winding up is stopped the full effect of the spring comes into play to prevent the load falling. The said cord wound on the drum 3 is passed through aperture 4 and secured by clamping- plate 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3910857A GB840532A (en) | 1957-12-16 | 1957-12-16 | Improvements in and relating to winches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3910857A GB840532A (en) | 1957-12-16 | 1957-12-16 | Improvements in and relating to winches |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB840532A true GB840532A (en) | 1960-07-06 |
Family
ID=10407681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3910857A Expired GB840532A (en) | 1957-12-16 | 1957-12-16 | Improvements in and relating to winches |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB840532A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503732A (en) * | 1981-12-08 | 1985-03-12 | Brose Fahrzeugteile Gmbh & Co. | Window lifter drive for motor vehicles and the like |
| GB2155887A (en) * | 1984-03-16 | 1985-10-02 | James Ind Ltd | Invalid hoists |
-
1957
- 1957-12-16 GB GB3910857A patent/GB840532A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503732A (en) * | 1981-12-08 | 1985-03-12 | Brose Fahrzeugteile Gmbh & Co. | Window lifter drive for motor vehicles and the like |
| GB2155887A (en) * | 1984-03-16 | 1985-10-02 | James Ind Ltd | Invalid hoists |
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