Patent US4638762A successfully refreshed from Google Patents.
Patent US4407500A successfully refreshed from Google Patents.
US4407500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racket handle
Assignee: Individual
•
Filing: 1982-06-24
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Granted: 1983-10-04
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Expires: 2002-06-24
Abstract
Abstract A handle for a racket of the type used in playing tennis and like sports includes an elongated shaft portion, a hollow grip portion attached to one end of the shaft portion and a frame portion connected to the other end of the shaft portion. The shaft portion includes two spaced apart hollow tube sections which, in their surfaces facing toward each other, are provided with slots extending in the longitudinal direction of the tube sections. The space between the portions of the tube sections which face each other in the transverse direction of the tube sections forms a Venturi region for creating a zone of reduced air pressure between the tube sections when the racket is swung during play. The zone of reduced air pressure cases air to be drawn from the interior of the tube sections through the longitudinal slots. The air drawn through the longitudinal slots is conducted from the tube sections and a passageway formed in the grip portion and through openings provided between the passageway and the periphery of the grip portion. The air flow generated when the racket is swung serves to ventilate the hand and to remove perspiration accumulating during play.
Inventors
- 👤 Ulrich Hofmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:01
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/08; A63B60/00; A63B60/06; A63B60/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
279 words
A racket of the type used in playing tennis and like sports, comprising an elongated shaft portion, a hollow grip portion having a forward portion and a butt portion with said forward portion being attached to one end of said shaft portion, said one end terminating within and adjacent to said forward portion of said grip, a frame portion connected to the other end of said shaft portion, said shaft portion including two spaced apart hollow tube sections, the space between the portions of said tube sections which face each other in the transverse direction of said tube sections including means for forming a Venturi region for creating a zone of reduced air pressure between said tube sections when the racket is swung, said portions being provided with slots extending generally in the longitudinal direction of said tube sections for allowing said zone of reduced air pressure to communicate with the interior of said tube sections, the interior of said grip portion forming a passageway for communicating air with the interior of said tube sections, said grip portion having a plurality of openings between said passageways and the outer periphery of said grip portion for allowing air to be drawn from the hand of a player using the racket, wherein said openings in said grip portion, said passageway in said grip portion, the interior of said tube sections and said Venturi region are adapted to conduct air therethrough from the hand of the player when the racket is swung, so that perpspiration accumulating on the hand of the player holding said grip portion is removed by the air drawn in said openings through said passageway of said grip portion.
Claim 2
Dependent Claim
279 words
A racket of the type used in playing tennis and like sports, comprising an elongated shaft portion, a hollow grip portion having a forward portion and a butt portion with said forward portion being attached to one end of said shaft portion, said one end terminating within and adjacent to said forward portion of said grip, a frame portion connected to the other end of said shaft portion, said shaft portion including two spaced apart hollow tube sections, the space between the portions of said tube sections which face each other in the transverse direction of said tube sections including means for forming a Venturi region for creating a zone of reduced air pressure between said tube sections when the racket is swung, said portions being provided with slots extending generally in the longitudinal direction of said tube sections for allowing said zone of reduced air pressure to communicate with the interior of said tube sections, the interior of said grip portion forming a passageway for communicating air with the interior of said tube sections, said grip portion having a plurality of openings between said passageways and the outer periphery of said grip portion for allowing air to be drawn from the hand of a player using the racket, wherein said openings in said grip portion, said passageway in said grip portion, the interior of said tube sections and said Venturi region are adapted to conduct air therethrough from the hand of the player when the racket is swung, so that perpspiration accumulating on the hand of the player holding said grip portion is removed by the air drawn in said openings through said passageway of said grip portion.
Claim 3
Dependent Claim
27 words
Racket as set forth in claim 1 wherein said tube sections extend parallel of each other over a substantial portion of their length from said grip portion.
Claim 4
Dependent Claim
52 words
Racket as set forth in claim 2, wherein at least the portions of said tube sections which face each other are streamlined surfaces convexly converging toward each other in the transverse direction of said tube sections, said slots being arranged at the point of the narrowest space defined by said convex surfaces.
Claim 5
Dependent Claim
29 words
Racket as set forth in claims 2 or 3, comprising an elongated web member supported and extending parallel of said tube sections in the space between said tube sections.
Claim 6
Dependent Claim
37 words
Racket as set forth in claim 1, wherein said slots are spaced apart in the longitudinal direction of said tube sections, said slots being placed in a staggered relationship relative to each other in said tube sections.
Claim 7
Dependent Claim
58 words
Racket as set forth in claim 1, wherein said tube sections diverge from said grip portion toward said frame portion, a body for displacing air being mounted in the space bounded by said tube sections, the side edges of said air-displacing body streamlined, convex surfaces which are disposed in juxtaposition to said tube sections and said frame portion.
Claim 8
Dependent Claim
70 words
Racket as set forth in claim 6, wherein a part of said frame portion is disposed in juxtaposition to said air-displacing body and is a hollow tube section whose interior is in communication with the interior of said tube sections, the surface of said part of said frame portion facing said air-displacing body being provided with slots for drawing air from the interior of said part of said frame portion.
Claim 9
Dependent Claim
26 words
Racket as set forth in claim 7, wherein the parts of said tube sections and said frame portion which face said air-displacing body have streamlined surfaces.
Claim 10
Dependent Claim
43 words
Racket as set forth in claim 1, wherein said portions of said tube sections which face each other converge toward each other in the transverse direction of said tube sections, said means for forming a Venturi region being defined by said converging portions.
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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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |