US4634121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bat swing practice means
Assignee: Individual
•
Filing: 1985-08-08
•
Granted: 1987-01-06
•
Expires: 2005-08-08
Abstract
Abstract A bat swing practice device comprising a shaft body having a predetermined length to be swung, a weight axially slidably put on the shaft body, and structure for engaging and disengaging the weight with and from the shaft body, the structure including a plurality of engagement holes formed in the shaft body at intervals and an engagement projection on the weight, the projection adapted to be resiliently engaged with and disengaged from any one of the engagement holes in the shaft body.
Inventors
- 👤 Yuuki Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:08
CPC Classifications
A; A63; A63B; A63B15/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
A bat swing practice means comprising a shaft body having a predetermined length to be swung, a weight axially slidably put on said shaft body, and means for engaging and disengaging said weight with and from said shaft body, said means including a plurality of engagement holes formed in said shaft body at spaced intervals therealong and an engagement projection on said weight, said projection being adapted to be resiliently engaged with and disengaged from any one of said engagement holes in said shaft body, said weight including a peripheral groove, and said engagement projection being secured to a loop-shape leaf spring resiliently fitted in said peripheral groove.
Claim 2
Dependent Claim
108 words
A bat swing practice means comprising a shaft body having a predetermined length to be swung, a weight axially slidably put on said shaft body, and means for engaging and disengaging said weight with and from said shaft body, said means including a plurality of engagement holes formed in said shaft body at spaced intervals therealong and an engagement projection on said weight, said projection being adapted to be resiliently engaged with and disengaged from any one of said engagement holes in said shaft body, said weight including a peripheral groove, and said engagement projection being secured to a loop-shape leaf spring resiliently fitted in said peripheral groove.
Claim 3
Dependent Claim
31 words
A bat swing practice means as set forth in claim 1 wherein a stopper for preventing the leaf spring from coming off is formed in the peripheral groove in the weight.
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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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |