Method and apparatus for raising and lowering a telescoping mast
US4598509A · kind A · utility
33Cited by
13References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1985 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | Jun 24, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B15/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Method and apparatus for raising and lowering a telescoping mast. A telescoping mast having an upper section slidably received within a lower section is pivotally connected to a base in a horizontal position. A line is connected to the lower end of the upper section and is placed over a pulley mounted on the upper end of the lower section and secured to the base. Upward pivoting of the lower section moves the mast to a vertical position while the upper section is extended by action of the line. Lowering the mast from the vertical position causes contraction of the upper section into the lower section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.