US3599739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overload protection for strain gauge load cells used in weigh scale load measurement
Assignee: Cutler Hammer Inc
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Filing: 1970-05-06
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Granted: 1971-08-17
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Expires: 1990-05-06
Abstract
Abstract An overload protective arrangement for strain gauge type load cells used in weigh scale force measurement. Calibrated springs are interposed in the tension coupling between the load cell and the weigh scale load resolving lever to provide an inextensible link in the coupling until the designed load limit of the scale is reached and as a progressively extensible link when the scale load limit is exceeded. Another embodiment uses a piston moving in a fluid pressure cylinder as part of such coupling in place of springs.
Inventors
- 👤 Frank S Hyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:05
CPC Classifications
G; G01; G01G; G01G3/00; G01G3/12; G01G3/14; G01G3/1402; G01G3/1408; G01G21/00; G01G21/23; G01G3/10; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/2206; Y; Y10; Y10S; Y10S177/00; Y10S177/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
The combination with a weigh scale having a weight responsive lever system with a load resolving lever which develops a force proportional to the total load being measured, of a strain-gaugetype load-measuring cell, and means interconnecting said loadresolving lever and said load cell and providing a tension coupling therebetween, said means including means acting as an inextensible link in the coupling until the force developed by said lever reaches a predetermined value and thereafter acting as an extensible link in accordance with the increase in force developed by said load-resolving lever.
Claim 2
Dependent Claim
91 words
The combination with a weigh scale having a weight responsive lever system with a load resolving lever which develops a force proportional to the total load being measured, of a strain-gaugetype load-measuring cell, and means interconnecting said loadresolving lever and said load cell and providing a tension coupling therebetween, said means including means acting as an inextensible link in the coupling until the force developed by said lever reaches a predetermined value and thereafter acting as an extensible link in accordance with the increase in force developed by said load-resolving lever.
Claim 3
Dependent Claim
45 words
The combination according to claim 1 wherein said included means comprises a piston movable in a fluid cylinder and means for developing a fluid pressure interiorally of said cylinder to hold said piston unmovable until the load applied on said lever exceeds said predetermined value.
Claim 4
Dependent Claim
49 words
The combination according to claim 1 wherein said included means comprises a spring calibrated to be unyieldable until the force applied on said coupling reaches said predetermined value, and thereafter extending proportionately to the increase in such force imposed on the coupling by said lever above said predetermined value.
Claim 5
Dependent Claim
48 words
The combination according to claim 3 wherein said spring is a flat member secured to said lever and said coupling and lying in a plane normal to said coupling for load values below said predetermined values and bending toward said load cell when said load value is exceeded.
Claim 6
Dependent Claim
54 words
The combination according to claim 3 wherein said spring is a coiled compression spring and the coupling includes a rigid member extending through said lever and said spring, and further includes means tending to compress spring on said lever on a side of the latter opposite to that on which said load cell lies.
References Cited (Backward Citations)
US1646151A
Cited
US745684A
Cited
US1142165A
Cited
US1654648A
Cited
US3120754A
Cited
US3502164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |