Patent US4750250A successfully refreshed from Google Patents.
US4750250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fastening drive elements of a hollow shaft
Assignee: Vitesco Technologies Lohmar Verwaltungs GmbH
•
Filing: 1986-08-26
•
Granted: 1988-06-14
•
Expires: 2006-08-26
Abstract
Abstract Method of fastening drive elements on a hollow shaft, which comprises: pushing n drive elements with a thickness a over a hollow shaft, retaining the drive elements at mutual spacings b and in respective desired azimuthal positions by means of holding devices; providing active sections of a material with a given limit of elasticity, a length c, mutual spacings d and being bounded by sealing lips on a hydraulic expanding device so that n(a+b)=n(c+d), pushing the hydraulic expanding device into the hollow shaft; and applying a pressure through the hollow shaft to the active sections stressing the material of the active sections radially beyond the given limit of elasticity.
Inventors
- 👤 Wolfgang Maus
- 👤 Helmut Swars
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:21
CPC Classifications
B; B23; B23P; B23P13/00; B21; B21D; B21D39/00; B21D39/08; B21D39/20; B21D39/203; B21D39/04; B21D53/00; B21D53/84; B21D53/845; F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/047; B23P2700/00; B23P2700/02; F16; F16H; F16H53/00; F16H53/02; F16H53/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49293; Y10T29/49805; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994; Y10T74/00; Y10T74/21; Y10T74/2101
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
Method of fastening drive elements on a hollow shaft, which comprises: pushing n drive elements with a thickness a over a hollow shaft of a material with a given limit of elasticity, retaining the drive elements at mutual spacings b and in respective desired azimuthal positions by means of holding devices; providing active sections with a length c, mutal spacings d and being bounded by sealing lips on a hydraulic expanding device so that n(a+b)=n(c+d), pushing the hydraulic expanding device into the hollow shaft; applying a pressure through the hydraulic expanding device to the active sections stressing the material of portions of the hollow shaft opposite the active sections radially beyond the given limit of elasticity and into secured engagement with the drive elements; reducing the pressure at the active sections; and withdrawing the hydraulic expanding device from the expanded hollow shaft.
Claim 2
Dependent Claim
142 words
Method of fastening drive elements on a hollow shaft, which comprises: pushing n drive elements with a thickness a over a hollow shaft of a material with a given limit of elasticity, retaining the drive elements at mutual spacings b and in respective desired azimuthal positions by means of holding devices; providing active sections with a length c, mutal spacings d and being bounded by sealing lips on a hydraulic expanding device so that n(a+b)=n(c+d), pushing the hydraulic expanding device into the hollow shaft; applying a pressure through the hydraulic expanding device to the active sections stressing the material of portions of the hollow shaft opposite the active sections radially beyond the given limit of elasticity and into secured engagement with the drive elements; reducing the pressure at the active sections; and withdrawing the hydraulic expanding device from the expanded hollow shaft.
Claim 3
Dependent Claim
9 words
Method according to claim 1, which comprises making a=c.
Claim 4
Dependent Claim
9 words
Method according to claim 1, which comprises making b=d.
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) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |