Patent US4811947A successfully refreshed from Google Patents.
US4811947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration absorber for a racket
Assignee: Yamaha Corp
•
Filing: 1987-02-18
•
Granted: 1989-03-14
•
Expires: 2007-02-18
Abstract
Abstract In construction of a vibration absorber for a racket, a mass is indirectly supported by a visco-elastic member arranged within the grip or the yoke of the racket via an elongated interface so that resonant swing of the interface on receipt of vibration from the head of the racket should cause deformation of the visco-elastic member for thermal diffusion of vibration energy. The visco-elastic member is sandwiched between two elongated leaf springs. One end of the leaf spring is mounted to the wall of the racket handle and the other end of the leaf spring supports the mass. By proper choice of the component, vibration in a specified frequency range can be selectively damped so as to match vibration characteristics of rackets of various types.
Inventors
- 👤 Masanori Takatsuka
- 👤 Yoshinori Hariguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:51
CPC Classifications
A; A63; A63B; A63B60/00; A63B60/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
A vibration absorbing apparatus adapted to be mounted within the straight end section of a racket comprising a visco-elastic member including first and second substantially parallel elongated faces, elongated securing means including a first end and a second end, said first end of said elongated securing means being adapted to be substantially fixedly mounted with respect to said visco-elastic member and said straight end section of said racket and said second end of said elongated securing means being substantially freely movable in response to vibrations applied to said racket, said elongated securing means including first and second elongated leaf spring members mounted on said first and second elongated faces of said visco-elastic member, respectively, whereby said visco-elastic member is sandwiched therebetween, and mass means affixed to said second end of said elongated securing means whereby upon mounting of said vibration absorbing apparatus within said straight end section of said racket, vibrations applied to said racket are substantially dampened by said visco-elastic member and said movement of said second end of said elongated securing means.
Claim 2
Dependent Claim
174 words
A vibration absorbing apparatus adapted to be mounted within the straight end section of a racket comprising a visco-elastic member including first and second substantially parallel elongated faces, elongated securing means including a first end and a second end, said first end of said elongated securing means being adapted to be substantially fixedly mounted with respect to said visco-elastic member and said straight end section of said racket and said second end of said elongated securing means being substantially freely movable in response to vibrations applied to said racket, said elongated securing means including first and second elongated leaf spring members mounted on said first and second elongated faces of said visco-elastic member, respectively, whereby said visco-elastic member is sandwiched therebetween, and mass means affixed to said second end of said elongated securing means whereby upon mounting of said vibration absorbing apparatus within said straight end section of said racket, vibrations applied to said racket are substantially dampened by said visco-elastic member and said movement of said second end of said elongated securing means.
Claim 3
Dependent Claim
195 words
A vibration absorbing racket including a racket head and a straight end section supporting said racket head, said vibration absorbing racket comprising a visco-elastic member including first and second substantially parallel elongated faces, mounting means for said visco-elastic member within said straight end section of said racket, elongated securing means mounting said visco-elastic member, said elongated securing means including a first end and a second end, said first end of said elongated securing means being fixedly mounted with respect to said visco-elastic member and said straight end section of said racket and said second end of said elongated securing means being substantially freely movable in response to vibrations applied to said racket head, said elongated securing means including first and second elongated leaf spring members mounted on said first and second elongated faces of said visco-elastic member, respectively, whereby said visco-elastic member is sandwiched therebetween, and mass means affixed to said second end of said elongated securing means whereby said vibrations applied to said racket head are substantially dampened by said visco-elastic member and said movement of said second end of said elongated securing means in response to said vibrations applied to said racket head.
Claim 4
Dependent Claim
195 words
A vibration absorbing racket including a racket head and a straight end section supporting said racket head, said vibration absorbing racket comprising a visco-elastic member including first and second substantially parallel elongated faces, mounting means for said visco-elastic member within said straight end section of said racket, elongated securing means mounting said visco-elastic member, said elongated securing means including a first end and a second end, said first end of said elongated securing means being fixedly mounted with respect to said visco-elastic member and said straight end section of said racket and said second end of said elongated securing means being substantially freely movable in response to vibrations applied to said racket head, said elongated securing means including first and second elongated leaf spring members mounted on said first and second elongated faces of said visco-elastic member, respectively, whereby said visco-elastic member is sandwiched therebetween, and mass means affixed to said second end of said elongated securing means whereby said vibrations applied to said racket head are substantially dampened by said visco-elastic member and said movement of said second end of said elongated securing means in response to said vibrations applied to said racket head.
Claim 5
Dependent Claim
25 words
The vibration absorbing racket of claim 2 wherein said mounting means is secured to the inner wall of said straight end section of said racket.
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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |