US3796322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crane trolley indicator
Assignee: HEEDE INT Inc
•
Filing: 1972-11-24
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Granted: 1974-03-12
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Expires: 1992-11-24
Abstract
Abstract A device for indicating the location of the trolley on the horizontal boom of a tower crane. A monitor on the trolley cable drive drum sends a signal to a meter in the operator''s cabin within the mast of the crane.
Inventors
- 👤 E Cording
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:55
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/18; B66C13/46; B66C9/00; B66C9/14; B66C2700/00; B66C2700/03; B66C2700/0385
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
In a tower crane having 1. a mast portion extending vertically; 2. a boom portion extending horizontally from the mast portion; 3. a track on the boom having riding thereon a trolley; 4. a trolley cable secured to the trolley and adapted to move the trolley along the track; 5. and a trolley cable drive drum having wrapped thereon the trolley cable, and being driven rotationally in either a clockwise or counterclockwise direction selectively from a remote operating position whereby the trolley is driven along the track; a device for indicating the position of the trolley on the track comprising a. monitor means on the trolley cable drive drum for monitoring the drum rotation; b. means for generating an electrical signal proportional to the trolley cable drive drum rotation connected to the monitor means, c. an indicator at the remote operating position having means for indicating the trolley position on the boom, d. and means for transmitting the generated electrical signal to the indicator means for indicating the trolley position on the boom.
Claim 2
Dependent Claim
173 words
In a tower crane having 1. a mast portion extending vertically; 2. a boom portion extending horizontally from the mast portion; 3. a track on the boom having riding thereon a trolley; 4. a trolley cable secured to the trolley and adapted to move the trolley along the track; 5. and a trolley cable drive drum having wrapped thereon the trolley cable, and being driven rotationally in either a clockwise or counterclockwise direction selectively from a remote operating position whereby the trolley is driven along the track; a device for indicating the position of the trolley on the track comprising a. monitor means on the trolley cable drive drum for monitoring the drum rotation; b. means for generating an electrical signal proportional to the trolley cable drive drum rotation connected to the monitor means, c. an indicator at the remote operating position having means for indicating the trolley position on the boom, d. and means for transmitting the generated electrical signal to the indicator means for indicating the trolley position on the boom.
Claim 3
Dependent Claim
9 words
a boom portion extending horizontally from the mast portion;
Claim 4
Dependent Claim
9 words
a boom portion extending horizontally from the mast portion;
Claim 5
Dependent Claim
10 words
a track on the boom having riding thereon a trolley;
Claim 6
Dependent Claim
10 words
a track on the boom having riding thereon a trolley;
Claim 7
Dependent Claim
16 words
a trolley cable secured to the trolley and adapted to move the trolley along the track;
Claim 8
Dependent Claim
16 words
a trolley cable secured to the trolley and adapted to move the trolley along the track;
Claim 9
Dependent Claim
123 words
and a trolley cable drive drum having wrapped thereon the trolley cable, and being driven rotationally in either a clockwise or counterclockwise direction selectively from a remote operating position whereby the trolley is driven along the track; a device for indicating the position of the trolley on the track comprising a. monitor means on the trolley cable drive drum for monitoring the drum rotation; b. means for generating an electrical signal proportional to the trolley cable drive drum rotation connected to the monitor means, c. an indicator at the remote operating position having means for indicating the trolley position on the boom, d. and means for transmitting the generated electrical signal to the indicator means for indicating the trolley position on the boom.
Claim 10
Dependent Claim
123 words
and a trolley cable drive drum having wrapped thereon the trolley cable, and being driven rotationally in either a clockwise or counterclockwise direction selectively from a remote operating position whereby the trolley is driven along the track; a device for indicating the position of the trolley on the track comprising a. monitor means on the trolley cable drive drum for monitoring the drum rotation; b. means for generating an electrical signal proportional to the trolley cable drive drum rotation connected to the monitor means, c. an indicator at the remote operating position having means for indicating the trolley position on the boom, d. and means for transmitting the generated electrical signal to the indicator means for indicating the trolley position on the boom.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |