US3866464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic load indicator
Assignee: Individual
•
Filing: 1973-09-04
•
Granted: 1975-02-18
•
Expires: 1993-09-04
Abstract
Abstract This disclosure describes a hydraulic type load indicator for the measurement of large tensile forces. It comprises a load cell which is made up of two flat metal parts held together by screws. At the interface between the two parts is a flat neoprene circular diaphragm with molded circumferential ''''O'''' ring, a circular piston fits into a corresponding opening in the top plate and pressed on the diaphragm. There is a circular cavity under the diaphragm which is filled with liquid. Pressure on the piston causes downward movement of the diaphragm and compression of the liquid. The compression in the liquid is measured by a conventional Bourdon indicator element. A hook is attached to a yoke which slips over the two plates and pressed on the piston by means of a ball seated in a cavity in the center of the top of the piston. The principle novelty of this invention lies in the design of the diaphragm so as to provide linear readings of the pressure gauge with force supplied to the piston, and in the design of the system so that a very minimum volume of liquid can be used and thereby minimize the effect of temperature on the gauge reading due to the temperature expansion coefficient of the liquid. Another important feature includes the simplicity of the design, construction, and the assembly of the instrument.
Inventors
- 👤 Samuel H Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:18
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
230 words
A device for insertion between an upwardly and downwardly extending line for measuring the tensile load comprising: a plate having a hydraulic fluid filled cavity in the upper surface thereof and a conduit opening communicating with the cavity; a diaphragm sealably covering said cavity; a cylindrical piston, the lower surface of which engages said diaphragm, the piston having an axially positioned spherical recess in the upper surface thereof; an upper line receiving means for securing an upwardly extending line thereto, said upper line receiving means being secured to said plate; a yoke member having an upper horizontal portion extending above said piston, said yoke member being movable relative to said plate, the yoke member horizontal portion having a recess in the lower surface thereof in vertical alignment with said spherical recess in said piston; a lower line receiving means adaptable to receive a downwardly extending line, the lower line receiving means being attached to said yoke member; a ball positioned in said recess in said yoke member horizontal portion and said cylindrical spherical recess in said piston, the tensile force applied by said lower line receiving means being applied by said ball against said piston; and a hydraulic pressure actuated indicating instrument supported to said plate and having communication with said conduit, the instrument being calibrated to reflect the tensile load applied between said upper and lower line receiving means.
Claim 2
Independent Claim
230 words
A device for insertion between an upwardly and downwardly extending line for measuring the tensile load comprising: a plate having a hydraulic fluid filled cavity in the upper surface thereof and a conduit opening communicating with the cavity; a diaphragm sealably covering said cavity; a cylindrical piston, the lower surface of which engages said diaphragm, the piston having an axially positioned spherical recess in the upper surface thereof; an upper line receiving means for securing an upwardly extending line thereto, said upper line receiving means being secured to said plate; a yoke member having an upper horizontal portion extending above said piston, said yoke member being movable relative to said plate, the yoke member horizontal portion having a recess in the lower surface thereof in vertical alignment with said spherical recess in said piston; a lower line receiving means adaptable to receive a downwardly extending line, the lower line receiving means being attached to said yoke member; a ball positioned in said recess in said yoke member horizontal portion and said cylindrical spherical recess in said piston, the tensile force applied by said lower line receiving means being applied by said ball against said piston; and a hydraulic pressure actuated indicating instrument supported to said plate and having communication with said conduit, the instrument being calibrated to reflect the tensile load applied between said upper and lower line receiving means.
Claim 3
Dependent Claim
82 words
A device for insertion between an upwardly and downwardly extending line for measuring the tensile load according to claim 1 wherein said plate includes: an upper plate portion having a cylindrical opening therein slidably receiving said piston; and a lower plate portion having said fluid filled cavity in the upper surface thereof in register with said upper plate cylindrical opening and having said conduit opening therein, the peripheral surfaces of said diaphragm being sealably clamped between said upper and lower plate portions.
Claim 4
Dependent Claim
60 words
A device for insertion between an upwardly and downwardly extending line for measuring the tensile load according to claim 2 including a ring cavity in the upper surface of said lower plate portion concentric with and surrounding said cavity and wherein said diaphragm is of circular contour and has an O-ring cross-section at its circumference sealably received in ring cavity.
Claim 5
Dependent Claim
55 words
A device for insertion between an upwardly and downwardly extending line for measuring the tensile load according to claim 1 wherein said yoke member upper horizontal portion recess is in the form of a threaded opening and including a threaded screw received in said threaded opening, the lower end of the screw engaging said ball.
Claim 6
Dependent Claim
39 words
A device for insertion between an upwardly and downwardly extending line for measuring the tensile load according to claim 1 wherein said indicating instrument includes a Bourdon tube pressure indicating means having communication with said conduit In said plate.
Claim 7
Dependent Claim
38 words
A device for insertion between an upwardly and downwardly extending line for measuring the tensile load according to claim 5 including a fluid flow restriction means in said conduit to isolate said Bourdon tube from transient pressure peaks.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |