US3885657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction clutch
Assignee: Individual
•
Filing: 1973-09-28
•
Granted: 1975-05-27
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Expires: 1993-09-28
Abstract
Abstract The drum element in a drum-type clutch is fastened to the input shaft of the clutch by means of a torque transmitting rubber ring interposed between the shaft and the inner face of a circumferential drum wall. The outer face of the drum wall may be engaged by friction shoes mounted on the output shaft, and the rubber ring is protected against premature deterioration by frictionally generated heat by a cavity which extends in the circumferential wall over the drum circumference between the inner and outer faces, and may be filled with air, with thermally insulating material, or with a circulating cooling fluid.
Inventors
- 👤 Hisaharu Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:11
CPC Classifications
F; F16; F16D; F16D3/00; F16D3/50; F16D3/76; F16D13/00; F16D13/10; F16D13/58; F16D13/72
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
226 words
In a clutch having an input member and an output member mounted for rotation relative to each other about a common axis, a drum element connected to one of said members for joint rotation and having an engagement face of circular cross section about said common axis, a plurality of friction shoes mounted on the other member in circumferentially spaced relationship, and actuating means for moving said friction shoes into motion transmitting frictional engagement with said engagement face, the improvement which comprises: a. said drum element including a circumferential wall having two annular portions offset radially relative to said common axis, 1. one of said portions carrying said engagement face, 2. the other portion being radially spaced from said one member, 3. the two portions of said circumferential wall defining therebetween at least one cavity extending about said common axis in an arc of at least 180*; and b. a ring of elastomeric material radially interposed between said other portion of said circumferential wall and said one member, respective radial portions of said ring being fixedly fastened to said one member and to said other portion of said circumferential wall for transmitting torque between said drum element and said one member, said at least one cavity impeding the transmission of the heat generated by frictional engagement of said shoes with said engagement face to said ring.
Claim 2
Dependent Claim
226 words
In a clutch having an input member and an output member mounted for rotation relative to each other about a common axis, a drum element connected to one of said members for joint rotation and having an engagement face of circular cross section about said common axis, a plurality of friction shoes mounted on the other member in circumferentially spaced relationship, and actuating means for moving said friction shoes into motion transmitting frictional engagement with said engagement face, the improvement which comprises: a. said drum element including a circumferential wall having two annular portions offset radially relative to said common axis, 1. one of said portions carrying said engagement face, 2. the other portion being radially spaced from said one member, 3. the two portions of said circumferential wall defining therebetween at least one cavity extending about said common axis in an arc of at least 180*; and b. a ring of elastomeric material radially interposed between said other portion of said circumferential wall and said one member, respective radial portions of said ring being fixedly fastened to said one member and to said other portion of said circumferential wall for transmitting torque between said drum element and said one member, said at least one cavity impeding the transmission of the heat generated by frictional engagement of said shoes with said engagement face to said ring.
Claim 3
Dependent Claim
10 words
the other portion being radially spaced from said one member,
Claim 4
Dependent Claim
10 words
the other portion being radially spaced from said one member,
Claim 5
Dependent Claim
34 words
In a clutch as set forth in claim 1, wherein said engagement face is convex, and said one portion of said circumferential wall is offset from said other portion in a radially outward direction.
Claim 6
Dependent Claim
18 words
In a clutch as set forth in claim 2, said drum element being hollow and enclosing said ring.
Claim 7
Dependent Claim
104 words
the two portions of said circumferential wall defining therebetween at least one cavity extending about said common axis in an arc of at least 180*; and b. a ring of elastomeric material radially interposed between said other portion of said circumferential wall and said one member, respective radial portions of said ring being fixedly fastened to said one member and to said other portion of said circumferential wall for transmitting torque between said drum element and said one member, said at least one cavity impeding the transmission of the heat generated by frictional engagement of said shoes with said engagement face to said ring.
Claim 8
Dependent Claim
104 words
the two portions of said circumferential wall defining therebetween at least one cavity extending about said common axis in an arc of at least 180*; and b. a ring of elastomeric material radially interposed between said other portion of said circumferential wall and said one member, respective radial portions of said ring being fixedly fastened to said one member and to said other portion of said circumferential wall for transmitting torque between said drum element and said one member, said at least one cavity impeding the transmission of the heat generated by frictional engagement of said shoes with said engagement face to said ring.
Claim 9
Dependent Claim
25 words
In a clutch as set forth in claim 3, said at least one cavity defined by said two portions being sealed in both axial direction.
Claim 10
Dependent Claim
13 words
In a clutch as set forth in claim 1, said ring being tubular.
Claim 11
Dependent Claim
50 words
In a clutch as set forth in claim 5, said ring being split in a plane radial to said axis into two axial parts, fastening means fastening inner and outer radial portions of the two axial parts to said one member and to said other portion of said circumferential wall.
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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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |