Patent US4274631A successfully refreshed from Google Patents.
US4274631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Baseball practice bat
Assignee: Individual
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Filing: 1979-03-08
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Granted: 1981-06-23
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Expires: 1999-03-08
Abstract
Abstract A baseball practice bat to emit hitting sounds upon swinging is disclosed. The bat comprises a bat body with a hollow interior, a pipe fastened within the body with its top end fitting into a top cap and with its bottom end fitting into a grip, guide slits longitudinally formed in the pipe, a ring-shaped weight slidably mounted around the pipe, a supporting pin extending through the slits with its ends fixed to the weight, and an elastic member extending inside the pipe with its top end fixed to the weight at the pin.
Inventors
- 👤 Tadao Hayazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:40
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/0002; A63B59/00; A63B59/50; A63B59/59; A63B2069/0004; A63B2069/0008; A63B2102/00; A63B2102/18; A63B60/00; A63B60/02; A63B60/04; A63B60/06; A63B60/08; A63B60/10; A63B60/16; A63B60/50
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
A baseball practice bat comprising a body with a hollow interior, a pipe fastened within the body with one of its ends fitting into a cap at one end of said bat and its other end fitting into the handle at the other end of said bat, a pair of diametrically opposed, guide slits longitudinally formed in said pipe, a weight slidably mounted exteriorly around said pipe, a supporting pin extending through said guide slits and said weight and slidably fixing said weight to said pipe, and an elongated elastic member extending inside the pipe having one of its ends fixed to the weight at the pin and its other end fixed at the handle of the bat.
Claim 2
Dependent Claim
118 words
A baseball practice bat comprising a body with a hollow interior, a pipe fastened within the body with one of its ends fitting into a cap at one end of said bat and its other end fitting into the handle at the other end of said bat, a pair of diametrically opposed, guide slits longitudinally formed in said pipe, a weight slidably mounted exteriorly around said pipe, a supporting pin extending through said guide slits and said weight and slidably fixing said weight to said pipe, and an elongated elastic member extending inside the pipe having one of its ends fixed to the weight at the pin and its other end fixed at the handle of the bat.
Claim 3
Dependent Claim
14 words
A baseball bat according to claim 1, wherein said body is made of aluminum.
Claim 4
Dependent Claim
15 words
A baseball bat according to claim 1, wherein said elastic member is a spring coil.
Claim 5
Dependent Claim
60 words
A baseball bat according to claim 3, wherein said spring coil is connected to a nut movably disposed around an elongated member, said elongated member extending from said grip into said spring coil, said stick having a groove on the bottom surface thereof, whereby said stick can be rotated to cause the nut to move for adjusting said spring coil.
References Cited (Backward Citations)
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Cited
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US3116926A
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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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |