US3883859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load height indication
Assignee: Individual
•
Filing: 1972-12-29
•
Granted: 1975-05-13
•
Expires: 1992-12-29
Abstract
Abstract Unseen loads on a tower crane are stopped at desired levels by an operator who is stationed at a location where the load cannot be seen. A rotation measuring device is mounted on the load cable winding drum. Gears between the drum and measuring means rotate the measuring means at a fixed number of turns per linear foot of the winding drum. A telemetering system turns a synchronous motor at the operator''s control station, and the synchronous motor turns an indicator to display the load position in numbers of feet from a reference point.
Inventors
- 👤 Edward F Ancheta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:34
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/18; B66C13/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
202 words
Load height indicating apparatus for tower cranes having a base, a column extending upward from the base, a jib extending horizontally from the column and mounted for rotation on the column, rotating means connected to the jib and to the column for rotating the jib on the column, a trolley mounted on the jib for selectively positioning on the jib, propelling means connected to the jib and to the trolley for moving the trolley on the jib, hoisting means connected to the trolley for lifting loads, and load engaging means connected to the hoisting means for engaging and holding loads on the hoisting means below the trolley, and control means connected to the rotating means, to the propelling means and to the hoisting means for separately controlling those means, the improvement comprising measuring means connected to the hoisting means for determining the condition of the hoisting means and thus determining position of the load engaging means with respect to the trolley, telemetering means connected to the measuring means for telemetering condition of the measuring means, and indicator means connected to the telemetering means and mounted near the control means for indicating condition of the measuring means and hence position of the load.
Claim 2
Dependent Claim
202 words
Load height indicating apparatus for tower cranes having a base, a column extending upward from the base, a jib extending horizontally from the column and mounted for rotation on the column, rotating means connected to the jib and to the column for rotating the jib on the column, a trolley mounted on the jib for selectively positioning on the jib, propelling means connected to the jib and to the trolley for moving the trolley on the jib, hoisting means connected to the trolley for lifting loads, and load engaging means connected to the hoisting means for engaging and holding loads on the hoisting means below the trolley, and control means connected to the rotating means, to the propelling means and to the hoisting means for separately controlling those means, the improvement comprising measuring means connected to the hoisting means for determining the condition of the hoisting means and thus determining position of the load engaging means with respect to the trolley, telemetering means connected to the measuring means for telemetering condition of the measuring means, and indicator means connected to the telemetering means and mounted near the control means for indicating condition of the measuring means and hence position of the load.
Claim 3
Dependent Claim
80 words
The load height indicating apparatus of claim 1 wherein the hoisting means comprises a winding drum and power means for operating the winding drum, a cable wrapped around the drum and extending over the jib to the trolley, extending downward from the trolley to the load engaging means and upward from the load engaging means to the trolley, and extending along the jib to an anchor, and wherein the measuring means comprises means for measuring cable deployed from the drum.
Claim 4
Dependent Claim
21 words
The load height indicating apparatus of claim 2 wherein the measuring means comprises means for measuring rotational movement of the drum.
Claim 5
Dependent Claim
98 words
The load height indicating apparatus of claim 3 wherein the measuring means comprises a gear connected to the drum, a second gear in engagement with the first gear and wherein the telemetering means comprises a generating means connected to the second gear for generAting a signal as the second gear turns, transmission means connected to the generating means for transmitting the signal from the generating means, motor means connected to the transmission means for movement in response to the signal from the transmission means, and wherein the indicator means comprises a reversible counter connected to the motor means.
Claim 6
Dependent Claim
27 words
The load height indicating apparatus of claim 4 wherein the generating means and motor means comprise Selsyn motors and wherein the transmission means comprises electrical communication means.
References Cited (Backward Citations)
US2565951A
Cited
US3199685A
Cited
US3562740A
Cited
US3545725A
Cited
US3724679A
Cited
US3750130A
Cited
US3796322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |