US3833932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boom length operating radius indicator and warning device
Assignee: Eaton Corp
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Filing: 1972-10-12
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Granted: 1974-09-03
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Expires: 1992-10-12
Abstract
Abstract A system for use with cranes which have booms that may be varied in length and angular relationship which continuously displays the operating radius and provides for a display of the boom length by pressing a button and which provides alarms to the operator for both radius and length of boom.
Inventors
- 👤 M Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:54
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/88; B66C23/90; B66C23/905; B66C2700/00; B66C2700/08; B66C2700/084
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
193 words
An operating radius and length indicator for a crane having an adjustable angle and length boom comprising: first means mounted on the boom for producing a signal ''''cos theta '''' proportional to the cosine of the angle of the boom relative to the horizontal; and second means variable in response to the length of the boom receiving the output of said first means to produce a signal ''''L cos theta '''' proportional to the length of the projection of the boom on the horizontal plane, means for setting a first threshold representation of a maximum ''''L cos theta '''' signal, a first differential amplifier receiving said ''''L cos theta '''' from said second means and a signal maximum ''''L cos theta '''' signal from said first threshold means, means for setting a second threshold corresponding to a maximum length of the boom, a second differential amplifier receiving signals from said second means and said means for setting said second threshold; a gate receiving the outputs of said first and second differential amplifiers, and an alarm connected to the output of said gate such that an alarm is given if either threshold is reached.
Claim 2
Dependent Claim
193 words
An operating radius and length indicator for a crane having an adjustable angle and length boom comprising: first means mounted on the boom for producing a signal ''''cos theta '''' proportional to the cosine of the angle of the boom relative to the horizontal; and second means variable in response to the length of the boom receiving the output of said first means to produce a signal ''''L cos theta '''' proportional to the length of the projection of the boom on the horizontal plane, means for setting a first threshold representation of a maximum ''''L cos theta '''' signal, a first differential amplifier receiving said ''''L cos theta '''' from said second means and a signal maximum ''''L cos theta '''' signal from said first threshold means, means for setting a second threshold corresponding to a maximum length of the boom, a second differential amplifier receiving signals from said second means and said means for setting said second threshold; a gate receiving the outputs of said first and second differential amplifiers, and an alarm connected to the output of said gate such that an alarm is given if either threshold is reached.
Claim 3
Dependent Claim
183 words
An operating radius and length indicator for a crane according to claim 1 including first, second, and third switches with the first switch connected to said first means for producing said ''''cos theta '''' signal to convert its output to one and wherein said boom is supported by a horizontal pivot axis from a cab which is rotatable about a vertical axis of said crane, means producing a signal ''''K'''' proportional to the horizontal offset distance from said vertical axis to said horizontal pivot axis and an indicator means receiving inputs from said means producing said ''''K'''' signal and said second means producing said ''''L cos theta '''' signal to produce an indication of the operating radius, said second switch connected between said indicator and said means producing said ''''K'''' signal to disconnect said means for producing said ''''K'''' signal, and said third switch connected between said gate means and said alarm, all three switches being controlled by a common push-button whereby so long as said push-button is depressed the alarm is disabled and the indicator means produces an indication of boom length.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |