US3683686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical torque wrench and a hydraulic readout therefor
Assignee: Raymond Engineering Inc
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Filing: 1970-04-27
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Granted: 1972-08-15
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Expires: 1990-04-27
Abstract
Abstract The output member of a torque wrench is ''''free-floating'''' with respect to the mounting member and therefore capable of epicycloidal oscillation, with respect to the mounting member, in response to forces generated by system misalignment or offset. This results in the reduction of side loading on the system to be torqued, less tendency to bind, and the production of accurate torque force readings. The torque measuring system comprises two hydraulic load-cells and a Bourdon gauge interconnected by hydraulic tubing, hermetically sealed and filled with a noncompressible fluid. The load-cells are loosely mounted symmetrically in opposite ends of the mounting member and are each compressible in either torque direction by loading pins mounted on the wrench case. The readout is thus hysteresis free. The use of two interconnected load-cells provides force compensation and thereby assures that an accurate reading is transmitted to the gauge. Furthermore, this force balance and the sliding motion permitted transverse to the load-cells'' axes facilitate the above-described ''''free-floating'''' feature.
Inventors
- 👤 Anthony J Sergan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:11
CPC Classifications
B; B25; B25B; B25B23/00; B25B23/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
89 words
A torque wrench comprising: A. a mounting member; B. a torque multiplying member attached to said mounting member with a circumferential degree of freedom allowing radial movement transverse to the axis about which the torque is applied, thereby being freely floating with respect to said mounting member; C. means for applying a torque between said mounting member and said torque multiplying member; and D. force sensing means functionally mounted between said mounting member and said torque multiplying member, a force of said torque being applied to said sensing means.
Claim 2
Dependent Claim
89 words
A torque wrench comprising: A. a mounting member; B. a torque multiplying member attached to said mounting member with a circumferential degree of freedom allowing radial movement transverse to the axis about which the torque is applied, thereby being freely floating with respect to said mounting member; C. means for applying a torque between said mounting member and said torque multiplying member; and D. force sensing means functionally mounted between said mounting member and said torque multiplying member, a force of said torque being applied to said sensing means.
Claim 3
Dependent Claim
46 words
A torque wrench as defined in claim 1, wherein said force sensing means comprises two force transducers mounted on diametrically opposite sides and equidistant from the axis about which said torque is transmitted between said members, said force sensing means thereby being sensitive to pure torque.
Claim 4
Dependent Claim
42 words
A torque wrench as defined in claim 2, wherein said two transducers are force to pressure transducers and said force sensing means further comprises a single pressure indicating device interconnected with the said two force transducers by a common pressure transmitting medium.
Claim 5
Dependent Claim
115 words
A torque wrench comprising: A. a torque indicating assembly comprising: a. two or more fluid load cells mounted on opposite sides of the torque axis, and b. a single pressure sensing device, all interconnected by a hermetically sealed common pressure transmitting medium; B. a torque wrench case comprising: a. supporting means in holding contact with said load-cells, b. torque multiplying means for producing an output torque which is substantially greater than an input initiating torque, and c. output means for transmitting said output torque; and C. a mounting member attached to said torque wrench case and comprising: a. means for containing said load cells, and b. locator means for proper positioning of said mounting member.
Claim 6
Dependent Claim
115 words
A torque wrench comprising: A. a torque indicating assembly comprising: a. two or more fluid load cells mounted on opposite sides of the torque axis, and b. a single pressure sensing device, all interconnected by a hermetically sealed common pressure transmitting medium; B. a torque wrench case comprising: a. supporting means in holding contact with said load-cells, b. torque multiplying means for producing an output torque which is substantially greater than an input initiating torque, and c. output means for transmitting said output torque; and C. a mounting member attached to said torque wrench case and comprising: a. means for containing said load cells, and b. locator means for proper positioning of said mounting member.
Claim 7
Dependent Claim
46 words
A torque wrench as defined in claim 4, wherein said supporting means comprise securing posts positioned symmetrically about and equidistant from the axis through which the torque is transmitted, which hold each load cell at the uppermost and lowermost point of the load cell''s central axis.
Claim 8
Dependent Claim
38 words
A torque wrench as defined in claim 5, wherein said load cells comprise bellows having locator depressions at the uppermost and lowermost point of their central axes to assure proper positioning of the bellows by the securing posts.
Claim 9
Dependent Claim
31 words
A torque wrench as defined in claim 4, wherein said containing means comprise substantially annular spaces which are symmetrical about and equidistant from the axis through which the torque is transmitted.
Claim 10
Dependent Claim
24 words
A torque wrench as defined in claim 4, wherein said locator means comprise pins for placement in properly positioned receiving holes of an adaptor.
Claim 11
Dependent Claim
25 words
A torque wrench as defined in claim 4, wherein said substantially annular spaces comprise a diameter greater than the outer diameter of said load cells.
Claim 12
Dependent Claim
27 words
A torque wrench as defined in claim 9, wherein said substantially annular spaces comprise an overall height that is greater than the height of said load cells.
Claim 13
Dependent Claim
77 words
A torque wrench comprising: A. a mounting member; B. a torque multIplying member slidably interconnected with said mounting member to allow planar epicycloidal oscillation of the torque multiplying member with respect to the mounting member; C. means for applying a torque between said mounting member and said torque multiplying member; and D. force sensing means functionally mounted between said mounting member and said torque multiplying member, a force of said torque being applied to said sensing means.
Claim 14
Dependent Claim
77 words
A torque wrench comprising: A. a mounting member; B. a torque multIplying member slidably interconnected with said mounting member to allow planar epicycloidal oscillation of the torque multiplying member with respect to the mounting member; C. means for applying a torque between said mounting member and said torque multiplying member; and D. force sensing means functionally mounted between said mounting member and said torque multiplying member, a force of said torque being applied to said sensing means.
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |