US4977794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flywheel
Assignee: ROADMASTER Inc AN IL CORP
•
Filing: 1989-05-11
•
Granted: 1990-12-18
•
Expires: 2009-05-11
Abstract
Abstract An exercise bicycle flywheel (1) comprises a pair of facing concave sheet metal discs (15A, 15B). The space defined between the discs is filled with a heavy material (M) which is a mixture of hematite chips, magnetite powder, hydrated lime, portland cement, and water.
Inventors
- 👤 Jeffrey D. Metcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:52
CPC Classifications
B; B62; B62M; B62M1/00; B62M1/10; A; A63; A63B; A63B21/00; A63B21/22; A63B21/225; F; F16; F16F; F16F15/00; F16F15/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
166 words
An exercise bicycle flywheel comprising a pair of facing, concave sheet metal discs, the space defined between said discs being filled with a material, each disc having a central opening for mounting the flywheel on a hub, the opening comprising a radial inner edge of each disc which is in a material-tight relation to said hub, an inwardly turned circumferential rim at the radial outer edge of the disc, the outer diameter of the rim of one disc being substantially equal to the inner diameter of the rim of the other disc for the first said rim to fit within the second said rim with the rims having a plurality of corresponding indentations equidistantly spaced therearound for the rims to interlockingly fit, a hole being formed in the corresponding indentation in each rim for the material to be poured into the space between the discs after they are fitted together, and a plug fitting in the holes after the material has been poured into the space.
Claim 2
Dependent Claim
166 words
An exercise bicycle flywheel comprising a pair of facing, concave sheet metal discs, the space defined between said discs being filled with a material, each disc having a central opening for mounting the flywheel on a hub, the opening comprising a radial inner edge of each disc which is in a material-tight relation to said hub, an inwardly turned circumferential rim at the radial outer edge of the disc, the outer diameter of the rim of one disc being substantially equal to the inner diameter of the rim of the other disc for the first said rim to fit within the second said rim with the rims having a plurality of corresponding indentations equidistantly spaced therearound for the rims to interlockingly fit, a hole being formed in the corresponding indentation in each rim for the material to be poured into the space between the discs after they are fitted together, and a plug fitting in the holes after the material has been poured into the space.
Claim 3
Dependent Claim
21 words
The flywheel of claim 1 wherein at least one of said discs is welded to the hub at its inner edge.
Claim 4
Dependent Claim
24 words
The flywheel of claim 1 further including attachment means for attaching the discs together, the attachments being made at each of the other indentations.
Claim 5
Dependent Claim
25 words
The flywheel of claim 1 wherein each of said discs is welded at its radially inner edge and unwelded at its outer radially outer edge.
Claim 6
Dependent Claim
19 words
The flywheel of claim 1 wherein the material in the said space in initially flowable plastic and thereafter set.
Claim 7
Dependent Claim
12 words
The flywheel of claim 1 wherein said heavy material is principally hematite.
Claim 8
Dependent Claim
59 words
An exercise bicycle flywheel comprising a pair of facing concave sheet metal discs, the space between the discs being filled with a fluent material consisting essentially, in parts by dry weight of: Hematite chips: 69 Magnetite powder: 18 Hydrated lime: 3 Portland cement: 10 to which is added: Water reduced: 10-25 oz. per 100 lb. cement Water: as needed.
Claim 9
Dependent Claim
59 words
An exercise bicycle flywheel comprising a pair of facing concave sheet metal discs, the space between the discs being filled with a fluent material consisting essentially, in parts by dry weight of: Hematite chips: 69 Magnetite powder: 18 Hydrated lime: 3 Portland cement: 10 to which is added: Water reduced: 10-25 oz. per 100 lb. cement Water: as needed.
References Cited (Backward Citations)
US1230205A
Cited
US1235153A
Cited
US1451818A
Cited
US2474370A
Cited
US3485037A
Cited
DE2504831A1
Cited
US4020937A
Cited
US4138286A
Cited
US4208921A
Cited
JPS58200831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |