US3859651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boom angle indicator
Assignee: Individual
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Filing: 1974-01-14
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Granted: 1975-01-07
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Expires: 1994-01-14
Abstract
Abstract There is disclosed a boom angle indicator and alarm for use with a crane which includes a boom-mounted, gravity-actuated scale and pointer which reads directly the boom angle and which actuates magnetic switches to produce a visual boom indication in increments of a predetermined number of degrees on a scale at a remote location, which scale includes a visual alarm that is capable of being preset for limits of the boom angle for any particular load as well as permanently indicating the ultimate limits of the boom angle.
Inventors
- 👤 Jr Thomas W Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/88; B66C23/90; G; G01; G01C; G01C9/00; G01C9/02; G01C9/04; G01C9/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A boom angle indicator comprising in combination: A. A boom-mounted, gravity-actuated indicator including a pivoted pointer and a scale with one of said pointer and scale, weighted to remain in a vertically-oriented position established by gravity regardless of the boom angle, and the other of said pointer and scale fixed to the boom, B. A magnet associated with said pointer, C. A plurality of magnetic switches mounted on said scale, spaced a predetermined number of degrees apart and positioned to be actuated by the magnet on the pointer when the magnet superimposes a switch. D. Said switches actuating lights on a remotely mounted scale to indicate the boom angle.
Claim 2
Dependent Claim
109 words
A boom angle indicator comprising in combination: A. A boom-mounted, gravity-actuated indicator including a pivoted pointer and a scale with one of said pointer and scale, weighted to remain in a vertically-oriented position established by gravity regardless of the boom angle, and the other of said pointer and scale fixed to the boom, B. A magnet associated with said pointer, C. A plurality of magnetic switches mounted on said scale, spaced a predetermined number of degrees apart and positioned to be actuated by the magnet on the pointer when the magnet superimposes a switch. D. Said switches actuating lights on a remotely mounted scale to indicate the boom angle.
Claim 3
Dependent Claim
34 words
The boom angle indicator of claim 1 wherein said magnet and switches are mounted to be out of alignment whereby the magnet superimposes each switch through a predetermined arc through which said pointer travels.
Claim 4
Dependent Claim
29 words
The boom angle indicator of claim 1 wherein said remotely mounted scale includes alarm lights to indicate when the boom is at an ultimate angle that cannot be exceeded.
Claim 5
Dependent Claim
40 words
The boom angle indicator of claim 1 wherein said remotely mounted scale includes an adjustable alarm to indicate any preselected light on said scale as an alarm light to indicate an angle beyoNd which the boom should not be maintained.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |