US3874229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pancake load cell
Assignee: Individual
•
Filing: 1974-03-11
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Granted: 1975-04-01
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Expires: 1994-03-11
Abstract
Abstract A load cell is formed in the shape of a pancake so as to be readily accommodated beneath objects to be weighed wherein the vertical clearance is low. The body includes a pancake shaped inner chamber filled with oil, a wall portion of the chamber being thinned to define a diaphragm. Strain gauges connect to the diaphragm which is responsive to pressure changes in the chamber as a consequence of weight tending to squeeze the pancake configuration, the strain gauges providing electrical signals constituting a function of the weight or force applied to the cell.
Inventors
- 👤 Alfred Newman Ormond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:30
CPC Classifications
G; G01; G01G; G01G5/00; G01G19/00; G01G19/08; G01G19/10; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/2206; G01L1/2231
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
A load cell comprising: a. an upper flat circular plate member having an upper shallow circular cavity on its underside; b. a lower flat circular plate member having a lower shallow circular cavity on its top side opposing said upper shallow circular cavity; c. means securing said upper plate member on top of said lower plate member such that the shallow cavities define an hermetically sealed circular chamber of inside diameter D'' and inside thickness T'' within said members, the overall configuration resulting in a general pancake shaped load cell of outside diameter D and outside central area of thickness T, the peripheral portion of the members radially beyond the central area of thickness T having a reduced outside thickness of T'''', the diameter of the end of the reduced outside thickness being D''''; wherein:
Claim 2
Dependent Claim
135 words
A load cell comprising: a. an upper flat circular plate member having an upper shallow circular cavity on its underside; b. a lower flat circular plate member having a lower shallow circular cavity on its top side opposing said upper shallow circular cavity; c. means securing said upper plate member on top of said lower plate member such that the shallow cavities define an hermetically sealed circular chamber of inside diameter D'' and inside thickness T'' within said members, the overall configuration resulting in a general pancake shaped load cell of outside diameter D and outside central area of thickness T, the peripheral portion of the members radially beyond the central area of thickness T having a reduced outside thickness of T'''', the diameter of the end of the reduced outside thickness being D''''; wherein:
Claim 3
Dependent Claim
57 words
A load cell according to claim 1, in which: D/T 15.5 + or - 0.5 D''/T'' 13.0 + or - 0.5 D/D'' 1.035 + or - 0.002 T/T'' 8.75 + or - 0.25 D''/d 13.2 + or - 0.5 d/t 25.0 + or - 1.0 D/D'''' 1.150 + or - 0.025 T/T'''' 4.75 + or - 0.25
Claim 4
Dependent Claim
53 words
A load cell according to claim 1, in which said means securing said upper plate member on top of said lower plate member comprises welding of the peripheral edge of the upper plate member to the peripheral edge of the lower plate member over 360* and wherein said substantially incompressible fluid comprises oil.
Claim 5
Dependent Claim
47 words
A load cell according to claim 1 including stop means limiting the movement of the plates towards and away from each other whereby when given compression and tension forces on the load cell exceed given values, the flexing of the peripheral portion of the cell is limited.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |