US4569407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable hydraulic scale
Assignee: MATTHEWS JOE W AND PAUL M THORP (MATTHEWS AND THORP - A PARTNERSHIP)
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Filing: 1984-05-07
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Granted: 1986-02-11
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Expires: 2004-05-07
Abstract
Abstract A weighing apparatus which eliminates knife edges, levers and linkages comprising a plurality of load bearing fluid cylinders supported by a base, a weighing platform supported by the load bearing cylinders. A plurality of secondary cylinders, hydraulically connected to the load bearing cylinders. The secondary cylinder being located under one end of a pivotal torque plate and a summing cylinder located under the other end of the plate. The summing cylinder being connected to a readout means.
Inventors
- 👤 Earl E. Gray
- 👤 Alton T. Timm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:06
CPC Classifications
G; G01; G01G; G01G21/00; G01G21/02; G01G21/10; G01G3/00; G01G3/10; G01G5/00; G01G5/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
131 words
A weighing apparatus comprising: (a) a base; (b) at least two load bearing fluid cylinders attached to said base, said load bearing fluid cylinders having a load bearing piston; (c) a weighing platform supported by said load bearing piston of said load bearing cylinder; (d) a torque plate support affixed to said base; (e) a torque plate pivotally attached to said torque plate support; (f) a plurality of secondary fluid cylinders supported by said base, positioned under one end of said pivotal torque plate, and hydraulically connected to said load bearing cylinders; (g) a summing cylinder supported by said base, and positioned under the end of the torque plate opposite the end of the torque plate over the secondary cylinders; and (h) a readout device hydraulically connected to said summing cylinder.
Claim 2
Dependent Claim
131 words
A weighing apparatus comprising: (a) a base; (b) at least two load bearing fluid cylinders attached to said base, said load bearing fluid cylinders having a load bearing piston; (c) a weighing platform supported by said load bearing piston of said load bearing cylinder; (d) a torque plate support affixed to said base; (e) a torque plate pivotally attached to said torque plate support; (f) a plurality of secondary fluid cylinders supported by said base, positioned under one end of said pivotal torque plate, and hydraulically connected to said load bearing cylinders; (g) a summing cylinder supported by said base, and positioned under the end of the torque plate opposite the end of the torque plate over the secondary cylinders; and (h) a readout device hydraulically connected to said summing cylinder.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 having four load bearing fluid cylinders and a separate secondary cell connected to each load bearing cylinder.
Claim 4
Dependent Claim
38 words
The apparatus of claim 1 and further comprising a check valve located between the summing cylinder and readout means and said valve when applied permits flow only in the direction from the summing cylinder to the readout means.
Claim 5
Dependent Claim
38 words
The apparatus of claim 2 and further comprising a check valve located between the summing cylinder and readout means which has a position which permits flow only in the direction from the summing cylinder to the readout means.
Claim 6
Dependent Claim
33 words
The apparatus of claim 1 wherein said torque plate support, torque, secondary fluid cylinders, and summing cylinder are located underneath the weighing platform and do not interfere with movement of the weighing platform.
Claim 7
Dependent Claim
26 words
The apparatus of claim 1 further comprising a stainless steel sealing diaphragm underneath said weighing platform and connected to said base, said sealing diaphragm being flexible.
Claim 8
Dependent Claim
19 words
The apparatus of claim 1 further comprising a seal of elastomeric material between said weighing platform and said base.
Claim 9
Dependent Claim
39 words
The apparatus of claim 1 further comprising a variable volume chamber located between the summing cylinder and the readout means, which permits the volume of the hydraulic system to be varied to allow zero adjustment of the readout means.
Claim 10
Dependent Claim
39 words
The apparatus of claim 2 further comprising a variable volume chamber located between the summing cylinder and the readout means, which permits the volume of the hydraulic system to be varied to allow zero adjustment of the readout means.
Claim 11
Dependent Claim
39 words
The apparatus of claim 3 further comprising a variable volume chamber located between the summing cylinder and the readout means, which permits the volume of the hydraulic system to be varied to allow zero adjustment of the readout means.
Claim 12
Dependent Claim
39 words
The apparatus of claim 4 further comprising a variable volume chamber located between the summing cylinder and the readout means, which permits the volume of the hydraulic system to be varied to allow zero adjustment of the readout means.
Claim 13
Dependent Claim
33 words
The apparatus of claim 2 wherein said torque plate support, torque, secondary fluid cylinders, and summing cylinder are located underneath the weighing platform and do not interfere with movement of the weighing platform.
Claim 14
Dependent Claim
26 words
The apparatus of claim 2 further comprising a stainless steel sealing diaphragm underneath said weighing platform and connected to said base, said sealing diaphragm being flexible.
Claim 15
Dependent Claim
19 words
The apparatus of claim 2 further comprising a seal of elastomeric material between said weighing platform and said base.
Claim 16
Dependent Claim
13 words
The apparatus of claim 1 wherein said readout device is a bourdon tube.
Claim 17
Dependent Claim
20 words
The apparatus of claim 1 wherein said readout device is comprised of a pressure transducer connected to an electronic meter.
Claim 18
Dependent Claim
146 words
A weighing apparatus comprising: (a) a base; (b) at least two load bearing fluid cylinders attached to said base, said load bearing fluid cylinders having a load bearing piston; (c) a weighing platform supported by said load bearing piston of said load bearing cylinder; (d) a torque plate support affixed to said base; (e) a torque plate pivotally attached to said torque plate support; (f) a number of secondary fluid cylinders equal to the number of said load bearing fluid cylinders, positioned under one end of said pivotal torque plate, and each of said secondary fluid cylinders is connected to a separate one of said bearing cylinders; (g) a summing cylinder supported by said base, and positioned under the end of the torque plate opposite the end of the torque plate over the secondary cylinders; and (h) a readout device hydraulically connected to said summing cylinder.
Claim 19
Dependent Claim
146 words
A weighing apparatus comprising: (a) a base; (b) at least two load bearing fluid cylinders attached to said base, said load bearing fluid cylinders having a load bearing piston; (c) a weighing platform supported by said load bearing piston of said load bearing cylinder; (d) a torque plate support affixed to said base; (e) a torque plate pivotally attached to said torque plate support; (f) a number of secondary fluid cylinders equal to the number of said load bearing fluid cylinders, positioned under one end of said pivotal torque plate, and each of said secondary fluid cylinders is connected to a separate one of said bearing cylinders; (g) a summing cylinder supported by said base, and positioned under the end of the torque plate opposite the end of the torque plate over the secondary cylinders; and (h) a readout device hydraulically connected to said summing cylinder.
Claim 20
Dependent Claim
33 words
The apparatus of claim 17 wherein said torque plate support, torque, secondary fluid cylinders, and summing cylinder are located underneath the weighing platform and do not interfere with movement of the weighing platform.
Claim 21
Dependent Claim
70 words
The apparatus of claim 18 further comprising a check valve located between the summing cylinder and readout means which has a position which permits flow only in the direction from the summing cylinder to the readout means; and a variable volume chamber located between the summing cylinder and the readout means, which permits the volume of the hydraulic system to be varied to allow zero adjustment of the readout means.
Claim 22
Dependent Claim
13 words
The apparatus of claim 19 wherein said readout device is a bourdon tube.
Claim 23
Dependent Claim
20 words
The apparatus of claim 19 wherein said readout device is comprised of a pressure transducer connected to an electronic meter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |