GB576839A - An overload indicator for hoisting mechanism - Google Patents
An overload indicator for hoisting mechanismInfo
- Publication number
- GB576839A GB576839A GB1420443A GB1420443A GB576839A GB 576839 A GB576839 A GB 576839A GB 1420443 A GB1420443 A GB 1420443A GB 1420443 A GB1420443 A GB 1420443A GB 576839 A GB576839 A GB 576839A
- Authority
- GB
- United Kingdom
- Prior art keywords
- contacts
- boom
- pointer
- brush
- disc
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/14—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing suspended loads
- G01G19/18—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing suspended loads having electrical weight-sensitive devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/22—Control systems or devices for electric drives
-
- 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
- B66C23/905—Devices for indicating or limiting lifting moment electrical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control And Safety Of Cranes (AREA)
- Jib Cranes (AREA)
Abstract
576,839. Crane indicators. CONRAD, J. C. Aug. 31, 1943, No. 14204. [Class 78 (iv)] An overload and elevation indicator for a crane comprises a pendulum 17 mounted on the boom and carrying a roller 29 which wipes contacts a-o in succession as the boom rises. Mounted also on the boom is a tension indicator comprising a spring-retracted pulley lying in a bight of the load cable and connected by a guided rod to a rack which rotates a pinion mounted on a spindle 51 fitted with a pointer 47. The tip 55 of the pointer 47 forms a brush which wipes over contacts a<1>-o<1> on a disc 53, and makes earth connexion for both the contacts a<1>-o<1> and a-o, each corresponding pair of contacts in the two systems being electrically connected by a wire W. When the load exceeds a pre-determined figure for a given inclination of the boom, the brush 55 will reach the contact on the disc 53 which corresponds to that which the pendulum roller 29 is touching, and so completes a circuit through a bell 60. A solenoid 62 is also energized which opens the circuit of the loadlifting motor. The contacts a<1>-o<1> have extensions 61 which reach nearly to the next contact and avoid dead positions. U.S.A. Specification 2,092,303 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1420443A GB576839A (en) | 1943-08-31 | 1943-08-31 | An overload indicator for hoisting mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1420443A GB576839A (en) | 1943-08-31 | 1943-08-31 | An overload indicator for hoisting mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB576839A true GB576839A (en) | 1946-04-23 |
Family
ID=10036944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1420443A Expired GB576839A (en) | 1943-08-31 | 1943-08-31 | An overload indicator for hoisting mechanism |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB576839A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1029547B (en) * | 1954-09-13 | 1958-05-08 | Orenstein & Koppel Ag | Safety device for hoists with variable overhang |
| CN108033362A (en) * | 2017-11-15 | 2018-05-15 | 南宁晟景工程咨询有限公司 | A kind of safety elevator |
-
1943
- 1943-08-31 GB GB1420443A patent/GB576839A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1029547B (en) * | 1954-09-13 | 1958-05-08 | Orenstein & Koppel Ag | Safety device for hoists with variable overhang |
| CN108033362A (en) * | 2017-11-15 | 2018-05-15 | 南宁晟景工程咨询有限公司 | A kind of safety elevator |
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