Latching mechanism for telescoping lifting apparatus
Abstract
Abstract 1. A TELESCOPING LOAD LIFTING APPARATUS COMPRISING A FIXED MAST PORTION, A MOVABLE MAST PORTION AND LOAD BEARING PORTION WHEREIN SAID MOVABLE MAST PORTION AND SAID LOAD BEARING PORTION ARE INDIVIDUALLY AND CONJOINTLY VERTICALLY MOVABLE WITH RESPECT TO SAID FIXED MAST PORTION AND INDIVIDUALLY VERTICALLY MOVABLE WITH RESPECT TO EACH OTHER, LATCHING MEANS COMPRISING VERTICALLY SPACED APART UPPER AND LOWER LATCH LEVER MEANS, EACH OF SAID LATCH LEVER MEANS PIVOTALLY MOUNTED UPON SAID MOVABLE MAST PORTION, SAID LOWER AND UPPER LATCH LEVER MEANS BEING OPERABLY INTERCONNECTED WHEREBY SAID LOWER LATCH LEVER MEANS MAY SELECTIVELY ENGAGE AND DISENGAGE SAID LOAD BEING PORTION WHEREBY SAID MOVABLE MAST PORTION AND THE LOAD BEARING PORTION ARE VERTICALLY MOVED CONJOINTLY FROM THEIR MOST EXTENDED POSITION TO A PREDETERMINED ELEVATION, AND WHEREBY SAID UPPER LATCH LEVER MEANS MAY SELECTIVELY ENGAGE SAID DISENGAGE SAID FIXED MAST PORTION FOR SELECTIVELY SUPPORTING SAID MOVABLE MAST PORTION DURING FURTHER VERTICAL MOVEMENT OF SAID LOAD BEARING PORTION ABOVE SAID PREDETERMINED ELEVATION.
Inventors
- 👤 F Rundle
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |