GB420921A - Improvements in safe load indicators for jib cranes - Google Patents
Improvements in safe load indicators for jib cranesInfo
- Publication number
- GB420921A GB420921A GB1841433A GB1841433A GB420921A GB 420921 A GB420921 A GB 420921A GB 1841433 A GB1841433 A GB 1841433A GB 1841433 A GB1841433 A GB 1841433A GB 420921 A GB420921 A GB 420921A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pivoted
- plate
- lever
- stirrup
- pointer
- 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
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
- B66C23/90—Devices for indicating or limiting lifting moment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
420,921. Jib cranes. BAKER, G., Greno House, Swinton, near Rotherham. June 28, 1933, No. 18414. [Class 78 (iv)] Relates to a safe-load indicator responsive to variation in the load and in the inclination of the job interposed as a unit in the derricking rope or other member of the derricking gear in which the tension varies with the load and with the inclination of the jib. As shown in Fig. 1, the device comprises a stirrup B and rod D connected with the tie-bar system at C and G, so as to compress a spring A between collars B<1>, D<1>. A dial.plate 1 weighted at W is pivoted at 8 on the stirrup B and carries a pointer 6 pivoted at 6<1> and connected by a link 5 with a lever 3 pivoted on the plate 1 at 2. One arm of this lever is formed as a quadrant bearing against a pin or roller 7 on the rod D, and the arrangement is such that the pointer 6 reaches the same position on the plate 1 when the specified maximum safe loads are on the crane at different inclinations of the jib. In a modification, Fig. 2, the dial plate 1 is rigid with the stirrup B and a lever 10 weighted at W is pivoted on the plate at 81 and is connected by a link 11 with a quadrantplate 31 pivoted to the pointer 6 at 2<1>, the pointer being pivoted on the dial-plate 1 at 6<1>. The quadrant plate 3<1> bears against a roller 7<1> on the rod D. In these forms an audible signal may be given by an alarm on the plate 1 or lever 10. In another modification, Fig. 3, the stirrup B and rod D are replaced by a pair of levers H, J pivoted together at K and forced apart against the action of the spring S by the tension on the derricking rope P which passes from the dead end O around a fixed guide N on the lever H, a sleeve L or a fixed guide on the pivot K, and a sleeve M on the lever J. Alternatively, the levers H, J, may be connected to the two parts of a divided derricking rope. In another modification, Fig. 4, the parts 10, 11, 31 of Fig. 2 are replaced by a pendulum W<1> pivoted on the stirrup B, a link 111, and a quadrant-plate 31 pivoted on the rod D and engaging a roller 7<1> on the pointer. The stirrup B, Figs. 1, 2 and 4, may be tubular and the indicator may be mounted on a frame free to turn on the stirrup and weighted to keep in one plane while the rope twists. The dial-plate 1, Fig. 3, pivoted on the lever H may co-operate with a pointer or a scale on the lever H or J to act as a radius indicator. Specification 405,653 is referred to.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1841433A GB420921A (en) | 1933-06-28 | 1933-06-28 | Improvements in safe load indicators for jib cranes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1841433A GB420921A (en) | 1933-06-28 | 1933-06-28 | Improvements in safe load indicators for jib cranes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB420921A true GB420921A (en) | 1934-12-11 |
Family
ID=10112036
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1841433A Expired GB420921A (en) | 1933-06-28 | 1933-06-28 | Improvements in safe load indicators for jib cranes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB420921A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2855886A (en) * | 1955-12-27 | 1958-10-14 | Clark Equipment Co | Radius indicator |
DE1188256B (en) * | 1960-07-02 | 1965-03-04 | Kloeckner Humboldt Deutz Ag | Safety device for motor vehicles |
-
1933
- 1933-06-28 GB GB1841433A patent/GB420921A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2855886A (en) * | 1955-12-27 | 1958-10-14 | Clark Equipment Co | Radius indicator |
DE1188256B (en) * | 1960-07-02 | 1965-03-04 | Kloeckner Humboldt Deutz Ag | Safety device for motor vehicles |
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