Patent US3637208A successfully refreshed from Google Patents.
US3637208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Baseball batting practice device
Assignee: Individual
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Filing: 1970-05-01
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Granted: 1972-01-25
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Expires: 1990-05-01
Abstract
Abstract A baseball practice device including vertical shafts, one above the other, and a friction clutch therebetween. A lateral arm on the upper shaft supports a ball on a cord on the extending end of the arm and the lower shaft is driven by a variable speed reversible electric motor. All of the named parts are mounted in a vertically movable frame. The frame does not turn, but there is a reversible motor and screw mechanism, also carried by the frame, which selectively adjusts the height of the latter and consequently the height of the arm. Preferably, the arm supporting the cord and ball is flexible; thus, the speed of the first-mentioned motor, by centrifugal force, determines the height of the ball from the ground. The two motors are driven at the same time from remote controls; thus, a batter does not know the elevation or speed of the ball when he swings a bat and tries to hit the ball as it approaches him.
Inventors
- 👤 Aubrey M Allred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:20
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/0073; A63B69/0079
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
A baseball practice device comprising A base, a vertical stationary support thereon, a second vertical support slidably mounted on the first said support, means preventing relative rotation between the two said supports, a vertical shaft rotatably carried by the second said support and extending thereabove, a laterally extending arm on the extending portion of said shaft, a ball tethered on the extending end of said arm, means rotating said shaft and means raising and lowering the second said support relative to said stationary support.
Claim 2
Dependent Claim
84 words
A baseball practice device comprising A base, a vertical stationary support thereon, a second vertical support slidably mounted on the first said support, means preventing relative rotation between the two said supports, a vertical shaft rotatably carried by the second said support and extending thereabove, a laterally extending arm on the extending portion of said shaft, a ball tethered on the extending end of said arm, means rotating said shaft and means raising and lowering the second said support relative to said stationary support.
Claim 3
Dependent Claim
71 words
A baseball practice device as defined in claim 1 and wherein said means rotating said vertical shaft includes a motor and reduction gear carried by the second said vertical support, a drive sprocket having a vertical axis driven by said reduction gear, a sprocket on said vertical shaft and an endless drive chain connecting the two said sprockets, and an electrically controlled clutch in said vertical shaft above the sprocket thereon.
Claim 4
Dependent Claim
62 words
A baseball practice device as defined in claim 1 and wherein said means raising and lowering said second vertical support includes a reversible motor mounted near the upper portion thereof, a reduction gear driven by the motor, a depending screw driven by the reduction gear and a fixed nut carried by the first said vertical support and threadedly receiving said depending screw.
Claim 5
Dependent Claim
40 words
A baseball practice device as defined in claim 1 wherein said means raising and lowering the second said support relative to said stationary support is operable during rotation of said shaft for effecting a change in elevation during batting practice.
Claim 6
Dependent Claim
39 words
A baseball practice device as defined in claim 4 wherein said means raising and lowering the second said support relative to said stationary support comprises a powered means that is responsively connected with and responsive to a remote control.
Claim 7
Dependent Claim
56 words
A baseball practice device as defined in claim 5 wherein said powered means comprises a reversible electric motor that is drivingly connected with one element of a screw element-nut element combination so as to effect respective directional rotation of said one element for raising and lowering the second said support with respect to said stationary support.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |