US3713129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crane overloading protective system
Assignee: Individual
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Filing: 1970-03-30
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Granted: 1973-01-23
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Expires: 1990-03-30
Abstract
Abstract A protective system for use with a multiple legged crane wherein a sensor is attached to each leg to determine the change in stress in that leg, and the several sensors are grouped to determine tipping along any side of the crane. Tipping is indicated by a reduced stress in the legs on a given side of the crane. The apparatus further furnishes the total hook load by summing the stress on all the legs.
Inventors
- 👤 R Buchholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:28
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/88; B66C23/90; B66C23/905
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
Protective apparatus for a crane having a plurality of legs and which can potentially be overturned about a side defined by a pair of adjacent legs, comprising load sensor means attached to each of said legs of the crane; load summing means for summing the load about each side of the crane, said load summing means including connections to the load sensor means in each pair of legs defining a side of the crane; and, a warning device actuated by said summing means when the load for one of said sides decreases below a predetermined limit.
Claim 2
Dependent Claim
96 words
Protective apparatus for a crane having a plurality of legs and which can potentially be overturned about a side defined by a pair of adjacent legs, comprising load sensor means attached to each of said legs of the crane; load summing means for summing the load about each side of the crane, said load summing means including connections to the load sensor means in each pair of legs defining a side of the crane; and, a warning device actuated by said summing means when the load for one of said sides decreases below a predetermined limit.
Claim 3
Dependent Claim
34 words
The invention of claim 1 including a summing means for summing the signals from all of said load sensors and for forming an output which is proportional to the hook load on said crane.
Claim 4
Dependent Claim
78 words
The invention of claim 1 wherein said crane includes at least three legs, and said three legs define at least two sides thereof, there being a summing comparator connected with the load sensor means defining one of said sides and an additional summing comparator connected with the load sensor means defining the other of said sides, said first and second summing comparators being communicated with an OR gate means for providing a driving signal to said warning device.
Claim 5
Dependent Claim
63 words
The invention of claim 1 for use with a crane having four legs arranged in a rectangle and including a load sensor means on each leg, each load sensor means supplying an input signal to two load summing means, each of said load summing means forming an indication to said warning device when the signals representative of load fall below a predetermined level.
Claim 6
Dependent Claim
54 words
The invention of claim 1 wherein said load summing means forms a binary output, one level indicative of load for the side associated with said summing means above a level considered safe, and the other binary signal indicative of load below a level considered safe and for which said warning device sounds an alarm.
Claim 7
Dependent Claim
40 words
The invention of claim 1 including at least two load summing means forming binary output signals indicative of load on the legs of the crane, and OR gate means having inputs forming an output signal connected to said warning device.
Claim 8
Dependent Claim
44 words
The invention of claim 1 wherein said warning device is rendered operative by a signal from an OR gate means, and said OR gate means receives as inputs thereto the output signals of load summing means for each of the sides of the crane.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |