Patent US3695100A successfully refreshed from Google Patents.
US3695100A
Expired / Lapsed
US
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Force measuring and indicating apparatus
Assignee: Individual
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Filing: 1970-10-05
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Granted: 1972-10-03
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Expires: 1990-10-05
Abstract
Abstract Force measuring and indicating apparatus includes a pressure indicating gauge, such as a Bourdon gauge, and a force responsive sending unit having a liquid containing piston chamber and a piston movable therein in proportion to the force of being measured. A fluid outlet is connected to the gauge, and a pair of check valves are connected in opposing directions between the outlet and the piston chamber to maintain a predetermined pressure to the gauge and to provide a substantially greater flow rate from the gauge to the piston chamber than in the opposite direction.
Inventors
- 👤 Wallace F Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:39
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
A force indicating system comprising a pressure gauge having a fluid connection thereto, a force responsive hydraulic sender unit means connected to said fluid connection for increasing the hydraulic pressure in said gauge to a value proportional to the force exerted on said sender unit and for maintaining said pressure at a predetermined positive value upon removal of said force from said sender unit, said sender unit comprising a housing defining a chamber for retaining a quantity of hydraulic fluid, a piston mounted in said chamber, an outlet port at one end of said chamber, spring means biasing said piston to a first position remote from said port, a control member connected to said piston for moving it from said first position toward said port against the biasing force exerted by said spring means, and a valve assembly mounted over said outlet port and including a first check valve for passing fluid to said outlet at a first rate of flow and a second check valve for passing fluid from said outlet to said chamber at a second rate of flow, said second rate of flow substantially exceeding said first rate of flow.
Claim 2
Dependent Claim
193 words
A force indicating system comprising a pressure gauge having a fluid connection thereto, a force responsive hydraulic sender unit means connected to said fluid connection for increasing the hydraulic pressure in said gauge to a value proportional to the force exerted on said sender unit and for maintaining said pressure at a predetermined positive value upon removal of said force from said sender unit, said sender unit comprising a housing defining a chamber for retaining a quantity of hydraulic fluid, a piston mounted in said chamber, an outlet port at one end of said chamber, spring means biasing said piston to a first position remote from said port, a control member connected to said piston for moving it from said first position toward said port against the biasing force exerted by said spring means, and a valve assembly mounted over said outlet port and including a first check valve for passing fluid to said outlet at a first rate of flow and a second check valve for passing fluid from said outlet to said chamber at a second rate of flow, said second rate of flow substantially exceeding said first rate of flow.
Claim 3
Dependent Claim
80 words
A force indicating system as set forth in claim 1 wherein said valve assembly comprises a valve seat surrounding said outlet port, a first cup-shaped, apertured valve member biased into sealing engagement with said seat, an apertured partition in said first valve member, and a flexible, imperforate valve member interposed between said partition and the apertured portion of said first valve member whereby to prevent the flow of fluid through the apertures in said first valve member into said chambers.
Claim 4
Dependent Claim
171 words
A hydraulic sender unit comprising a housing defining first and second concentric chambers, a piston reciprocably mounted in one of said chambers, an outlet at one end of said one of said chambers, spring means biasing said piston into a first position, a control rod connected to said piston for moving said piston from said first position remote from said outlet toward said outlet, a passageway beTween said chambers and located so as to be open when said piston is in said first position and to be closed by said piston during movement thereof toward said outlet, a valve assembly mounted over said outlet in said one of said chambers, said valve assembly including a first check valve for passing hydraulic fluid from said one of said chambers to said outlet at a first flow rate, and a second check valve for passing hydraulic fluid from said outlet to said one of said chambers at a second flow rate, said second flow rate being substantially greater than said first flow rate.
Claim 5
Dependent Claim
171 words
A hydraulic sender unit comprising a housing defining first and second concentric chambers, a piston reciprocably mounted in one of said chambers, an outlet at one end of said one of said chambers, spring means biasing said piston into a first position, a control rod connected to said piston for moving said piston from said first position remote from said outlet toward said outlet, a passageway beTween said chambers and located so as to be open when said piston is in said first position and to be closed by said piston during movement thereof toward said outlet, a valve assembly mounted over said outlet in said one of said chambers, said valve assembly including a first check valve for passing hydraulic fluid from said one of said chambers to said outlet at a first flow rate, and a second check valve for passing hydraulic fluid from said outlet to said one of said chambers at a second flow rate, said second flow rate being substantially greater than said first flow rate.
Claim 6
Dependent Claim
35 words
A hydraulic sender unit as set forth in claim 3 wherein said piston has a resilient end portion for sealably closing said passageway when said piston is moved from said first position toward said outlet.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |