US4299383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tennis training device
Assignee: Individual
•
Filing: 1979-11-27
•
Granted: 1981-11-10
•
Expires: 1999-11-27
Abstract
Abstract A tennis training device having ball emitting cylinder for cylically emitting tennis balls to a player's side, a ball collecting device for collecting tennis balls hit by a player, a ball control device for controlling horizontal and vertical angles of the ball emitting cylinder, a ball transfer device for transferring the tennis balls from the ball collecting device to the ball emitting cylinder and a ball distributing device located between the ball collecting device and the ball emitting cylinder for feeding the balls one by one to the ball emitting cylinder continuously with a constant time period between contiguous following balls.
Inventors
- 👤 Sueto Yuasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:38
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/40; A63B69/406; A63B47/00; A63B47/02; A63B47/025; A63B2047/028; A63B47/002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
247 words
A tennis training device, comprising: (a) ball emitting means for cyclically emitting tennis balls to a player's side; (b) ball collecting means for collecting tennis balls hit by a player; (c) control means for controlling horizontal and vertical angles of said ball emitting means; (d) ball transfer means for transferring said tennis balls from said ball collecting means to said ball emitting means; (e) ball distributing means located between said ball collecting means and said ball emitting means for feeding the balls one by one to said ball emitting means continuously with a constant time period between contiguous balls; and (f) said ball distributing means including a ball receiving dish, a drum rotatably located in said dish and having a plurality of bores located on a coaxial circle of said drum for temporarily holding said tennis balls therein from said ball collecting means, a ball retaining cylinder projecting down from a bore in the bottom of said dish, a rotary disc located beneath said ball retaining cylinder and having half as many elliptical bores therein as the number of said bores in said drum, and a supporting base supporting said dish, drum and rotary disc and having an opening which is aligned with said ball retaining cylinder, whereby the tennis balls from said ball collecting means pass through said bores in said drum, the bore in said dish, said ball retaining cylinder, said elliptical bores and the opening of said supporting base to said ball transfer means.
Claim 2
Dependent Claim
247 words
A tennis training device, comprising: (a) ball emitting means for cyclically emitting tennis balls to a player's side; (b) ball collecting means for collecting tennis balls hit by a player; (c) control means for controlling horizontal and vertical angles of said ball emitting means; (d) ball transfer means for transferring said tennis balls from said ball collecting means to said ball emitting means; (e) ball distributing means located between said ball collecting means and said ball emitting means for feeding the balls one by one to said ball emitting means continuously with a constant time period between contiguous balls; and (f) said ball distributing means including a ball receiving dish, a drum rotatably located in said dish and having a plurality of bores located on a coaxial circle of said drum for temporarily holding said tennis balls therein from said ball collecting means, a ball retaining cylinder projecting down from a bore in the bottom of said dish, a rotary disc located beneath said ball retaining cylinder and having half as many elliptical bores therein as the number of said bores in said drum, and a supporting base supporting said dish, drum and rotary disc and having an opening which is aligned with said ball retaining cylinder, whereby the tennis balls from said ball collecting means pass through said bores in said drum, the bore in said dish, said ball retaining cylinder, said elliptical bores and the opening of said supporting base to said ball transfer means.
Claim 3
Dependent Claim
48 words
A tennis training device as claimed in claim 1, in which said ball receiving dish has a ball control means at an inner periphery thereof and above said drum so as to feed the balls from said ball collecting means to said ball retaining cylinder one by one.
Claim 4
Dependent Claim
27 words
A tennis training device as claimed in claim 1, in which said supporting base has supported therein a motor for rotating said drum and said rotary disc.
Claim 5
Dependent Claim
28 words
A tennis training device as claimed in claim 1, further comprising a communication pipe for transferring said balls from said ball distributing means to said ball transfer means.
Claim 6
Dependent Claim
25 words
A tennis training device as claimed in claim 4, further comprising a blower for transferring the balls from said ball distributing means through said pipe.
References Cited (Backward Citations)
US1223386A
Cited
US2087575A
Cited
US3089476A
Cited
US3203696A
Cited
US3308802A
Cited
US3306613A
Cited
US3724437A
Cited
US3785358A
Cited
US3766901A
Cited
US3774584A
Cited
US4108432A
Cited
US3989246A
Cited
US3989245A
Cited
US3913552A
Cited
US4077386A
Cited
US4074905A
Cited
US4094294A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |