Patent US4907800A successfully refreshed from Google Patents.
US4907800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bat swing practice apparatus
Assignee: Individual
•
Filing: 1987-09-24
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Granted: 1990-03-13
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Expires: 2007-09-24
Abstract
Abstract The training aid has a handle with a fan section at its far end. The fan section provides resistance to swinging the handle. The fan section has a rotatable fan and a friction element which varies the rotational resistance of the fan.
Inventors
- 👤 Richard S. Passamaneck
- 👤 Larry G. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:13
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/36; A63B69/3623; A63B69/3632; A63B69/0002; A63B21/00; A63B21/008; A63B21/0085; A63B21/0088
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
84 words
A device, comprising: a fan having a plurality of fan blades; a housing mounting said fan for rotation relative thereto; an elongated handle attached to said housing to permit a subject to swing said housing such that said fan rotates by relative motion between said fan and ambient to produce a resistance to said swinging and provide exercise to said subject; and means for adjusting rotational resistance of said fan such that the amount of exercise obtained by swinging said handle can be adjusted.
Claim 2
Independent Claim
84 words
A device, comprising: a fan having a plurality of fan blades; a housing mounting said fan for rotation relative thereto; an elongated handle attached to said housing to permit a subject to swing said housing such that said fan rotates by relative motion between said fan and ambient to produce a resistance to said swinging and provide exercise to said subject; and means for adjusting rotational resistance of said fan such that the amount of exercise obtained by swinging said handle can be adjusted.
Claim 3
Dependent Claim
73 words
A device as claimed in claim 1 wherein said fan is attached to a shaft and said adjusting means comprises a first bearing mounting one side of said shaft and a second bearing mounting a second side of said shaft, said first bearing having a greater resistance to rotation than said second bearing such that the resistance of said fan to rotation varies depending on the direction in which said handle is swung.
Claim 4
Dependent Claim
71 words
A device as claimed in claim 2 wherein said housing has two opposed openings and said fan is positioned in said housing such that when said handle is swung in one direction air enters one opening and forces said fan against one of said bearings, and when said handle is swung in an opposite direction, air enters the other opening and the fan is forced against the other of said bearings.
Claim 5
Dependent Claim
14 words
A device as claimed in claim 1 wherein one of said bearings is tapered.
Claim 6
Dependent Claim
24 words
A device as claimed in claim 1 wherein said adjusting means comprises a movable pad for applying an adjustable rotating friction to said fan.
Claim 7
Dependent Claim
27 words
A device as claimed in claim 1 wherein said fan is mounted to a shaft and said adjusting means comprises an adjustable diameter bearing mounting said shaft.
Claim 8
Dependent Claim
16 words
A device as claimed in claim 1 wherein handle has the shape of a baseball bat.
Claim 9
Dependent Claim
17 words
A device as claimed in claim 1 wherein said handle has the shape of a golf club.
Claim 10
Dependent Claim
12 words
A device as claimed in claim 1 wherein said housing is cylindrical.
Claim 11
Dependent Claim
14 words
A device as claimed in claim 1 wherein said fan has overlapping fan blades.
Claim 12
Dependent Claim
17 words
A device as claimed in claim 1 wherein said handle is at least 20 inches in length.
Claim 13
Dependent Claim
15 words
A device as claimed in claim 11 wherein said handle weighs at least 20 ounces.
Claim 14
Dependent Claim
18 words
A device as claimed in claim 1 wherein said handle is divided into two sections which screw together.
Claim 15
Dependent Claim
33 words
A device as claimed in claim 1 wherein said mounting includes a shaft, a bearing receiving said shaft, and a bearing cap receiving said bearing said bearing cap being attached to said housing.
Claim 16
Dependent Claim
28 words
A device as claimed in claim 1 wherein said means for adjusting rotational resistance of said fan comprises means for abutting against said fan with a variable force.
Claim 17
Dependent Claim
72 words
A device as claimed in claim 15 wherein said fan is mounted on an axle for rotational movement and axial movement along said axle and wherein said means for abutting against said fan comprises a member mounted to said fan and mounting at least one spring loaded member biased into contact with said fan such that axial movement of said fan towards said spring loaded member increases rotational resistance to said fan.
References Cited (Backward Citations)
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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) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |