US3911737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy duty load cell
Assignee: Individual
•
Filing: 1974-06-27
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Granted: 1975-10-14
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Expires: 1994-06-27
Abstract
Abstract The load cell is particularly useful for measuring tension in a crane cable and comprises a body having its opposite ends connected in the cable so that a tension force is applied thereto. A central circumferential portion of the body is recessed to leave a central axial column connecting the end portions. A ring coaxially surrounds the column and is rigidly connected at its inner opposite ends over 360* to the opposed opposite end portions of the body. A strain gauge is secured to the central integral column and connected to a read out device. The major portion of the axial load is carried by the ring and extraneous torsion, bending and side load components are absorbed in the ring so that a true measure of the axial force is determined by measuring the strain in the central column.
Inventors
- 👤 Alfred Newman Ormond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:44
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/2206; G01L1/2218; B; B66; B66C; B66C13/00; B66C13/16; G01G; G01G19/00; G01G19/14; G01G19/18; G01L5/00; G01L5/04; G01L5/10; G01L5/101
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
216 words
A heavy duty load cell for measuring axial loads comprising, in combination: a. an elongated integral body member having a circumferential recess between its opposite end portions leaving a centrally disposed axial column connecting said end portion; b. a ring coaxially aligned with said column and of an axial length greater than the width of said recess, the opposite inner ends of said ring being rigidly secured over 360* to the opposed circumferential edges of said end portions of said body member defined by the circumferential entrance of the recess said centrally disposed axial column being pre-loaded in one direction by pre-loading said ring in an opposite axial direction at the time it is secured to said opposed circumferential end portions of said body member; and, c. strain gauge means secured to opposite sides of the central portion of said column for connection to a read out device whereby the major portion of an axial load applied to said opposite end portions of said body is borne by said ring, extraneous torsion bending and side load components being absorbed by said ring so that strains developed in said centrally disposed axial column are a function of only the load in an axial direction to thereby provide a consistent and accurate read out of the axial load.
Claim 2
Dependent Claim
216 words
A heavy duty load cell for measuring axial loads comprising, in combination: a. an elongated integral body member having a circumferential recess between its opposite end portions leaving a centrally disposed axial column connecting said end portion; b. a ring coaxially aligned with said column and of an axial length greater than the width of said recess, the opposite inner ends of said ring being rigidly secured over 360* to the opposed circumferential edges of said end portions of said body member defined by the circumferential entrance of the recess said centrally disposed axial column being pre-loaded in one direction by pre-loading said ring in an opposite axial direction at the time it is secured to said opposed circumferential end portions of said body member; and, c. strain gauge means secured to opposite sides of the central portion of said column for connection to a read out device whereby the major portion of an axial load applied to said opposite end portions of said body is borne by said ring, extraneous torsion bending and side load components being absorbed by said ring so that strains developed in said centrally disposed axial column are a function of only the load in an axial direction to thereby provide a consistent and accurate read out of the axial load.
Claim 3
Dependent Claim
61 words
A load cell according to claim 1, in which said opposed circumferential edges of said end portions of said body are stepped in opposite axial directions so that the inner wall length of said ring in an axial direction between the secured inner opposite ends is greater than the width of the recess and thus the axial length of said column.
Claim 4
Dependent Claim
110 words
A load cell according to claim 2, wherein if D is the inside diameter of said ring, D'' the outside diameter of said ring, L the length of said ring in an axial direction as measured on its interior wall between said opposed circumferential edges, L'' the length of said ring in an axial direction as measured on its exterior wall, W the axial width of said recess defining the axial length of said column, d the transverse dimension of said column between opposite sides, and s the transverse dimension of the strain gauge means, then: 2L<D<8L 0.1L<D'' - D<L 0.1L<L'' - L<L L < or = W<4L 0.05L<d<0.05L 0.05L<s<0.5L
Claim 5
Dependent Claim
31 words
A load cell according to claim 3, in which, within plus or minus five percent D 3L D'' - D 0.5L L'' - L 0.75L W L d 0.2L s 0.2L
Claim 6
Dependent Claim
24 words
A load cell according to claim 1, in which said centrally disposed axial column is pre-loaded in tension by preloading said ring in compression.
Claim 7
Dependent Claim
24 words
A load cell according to claim 1, in which said centrally Disposed axial column is pre-loaded in compression by preloading said ring in tension.
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) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |