US3838936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable damping device, in particular for boring bars and the like
Assignee: As Trondhjems Nagle & Spigerfab no
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Filing: 1973-01-19
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Granted: 1974-10-01
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Expires: 1993-01-19
Abstract
Abstract An adjustable damping device, in particular for boring bars and the like, comprising a damping member arranged in an axial bore in the boring bar and coupled thereto through one or more annular spring elements of resilient material, for instance rubber. The spring elements are adapted to be compressed axially in a controllable way between surfaces of engagement at each end of the damping member thereby to vary the stiffness of the spring members. There is provided a substantially conical end face on at least one spring element and/or on one or both adjoining engagement surfaces, so that between each spring element and at least one adjoining engagement surface there is formed a gap with a substantially wedge-shaped cross-section.
Inventors
- 👤 I Rosdal
- 👤 H Holmen
- 👤 L Andreassen
- 👤 G Rosdal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:04
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/10; F16F7/104; F16F7/108; B; B23; B23B; B23B29/00; B23B29/02; B23B29/022; B23Q; B23Q11/00; B23Q11/0032; Y; Y10; Y10T; Y10T408/00; Y10T408/76; Y10T409/00; Y10T409/30; Y10T409/304312
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
An adjustable damping device for a boring bar, comprising: a damping member fully enclosed in an axial bore in the boring bar; at least two annular spring elements of resilient material positioned between said damping member and said boring bar and each of said spring elements contacting both said damping member and said boring bar at surface of engagement respectively thereof; means for axially compressing each of said spring elements in a controllable manner at said surfaces of engagement to thereby vary the stiffness of said spring elements, at least one of said surfaces of engagement being a substantially conical end face, such that at least one gap is formed having a substantially wedge shaped cross section with the longitudinal axis of said wedge shape being generally radial relative to said boring bar, said at least one gap being defined by said at least one conical end face surface of engagement and the surfaces contacting therewith.
Claim 2
Dependent Claim
156 words
An adjustable damping device for a boring bar, comprising: a damping member fully enclosed in an axial bore in the boring bar; at least two annular spring elements of resilient material positioned between said damping member and said boring bar and each of said spring elements contacting both said damping member and said boring bar at surface of engagement respectively thereof; means for axially compressing each of said spring elements in a controllable manner at said surfaces of engagement to thereby vary the stiffness of said spring elements, at least one of said surfaces of engagement being a substantially conical end face, such that at least one gap is formed having a substantially wedge shaped cross section with the longitudinal axis of said wedge shape being generally radial relative to said boring bar, said at least one gap being defined by said at least one conical end face surface of engagement and the surfaces contacting therewith.
Claim 3
Dependent Claim
36 words
The device of claim 1 wherein at least one of said surfaces of engagement of said damping member surface and the associated contacting surface of said annular spring element surface is a substantially conical end face.
Claim 4
Dependent Claim
15 words
A device as claimed in claim 2, including fluid means for adjusting said damping member.
Claim 5
Dependent Claim
27 words
A device as claimed in claim 2, wherein each of said spring elements has a rectangular cross-section, and said damping member has an adjoining conical end face.
Claim 6
Dependent Claim
23 words
A device as claimed in claim 2, wherein said damping member has an end extension adapted to protrude into each cooperating spring element.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |