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US 4,357,012 AGranted
Game racket having removable stringed insert
OwnerMichael B. Maynardinventor
Life of this patent
Estimating the term…
Abstract
A sports racket such as a tennis racket has a head comprising a pair of concentric frames wherein an inner frame equipped with tensioned strings is supported resiliently within an outer frame by an inflated tube lying within opposing parallel channels extending respectively about the periphery of the inner frame and along the interior of the outer frame. Variation of the pressure of inflation of the tube controls the elasticity of the support of the inner frame, and deflation of the tube permits rapid removal and replacement of the inner frame.
Claims12
A sports racket, comprising:
- (a) a handle;
- (b) an outer frame fixedly attached to said handle;
- (c) a stringed inner frame whose exterior shape corresponds to the interior shape of said outer frame;
- and
- (d) inflatable means extending around said inner frame and within said outer frame, for supporting and retaining said inner frame within said outer frame when said inflatable means is inflated and permitting removal of said inner frame from within said outer frame when said inflatable means is deflated.
2 more elements
A sports racket, comprising:
- (a) a handle;
- (b) a unitary outer frame fixedly connected to said handle, said outer frame defining an interior opening and including a first channel extending along the interior side thereof, said first channel being open toward said interior opening;
- (c) an inner frame no larger than said interior opening defining a striking zone surrounded thereby, said inner frame defining a second channel extending circumferentially along the exterior side thereof, said inner frame being located within said outer frame and being generally co-planar therewith;
- and
- (d) an inflatable resiliently flexible tube extending around said inner frame, respective portions thereof being located within said first and second channels, said flexible tube supporting said inner frame removably in a predetermined location within said outer frame.
2 more elements
A sports racket, comprising:
- (a) a handle;
- (b) an outer frame connected to said handle;
- (c) an inner frame removably located within an interior opening defined by said outer frame, said inner frame defining a striking zone and including means for independently supporting strings extending through said striking zone under tension;
- (d) means for defining a first channel extending around the interior of said outer frame;
- (e) means for defining a second channel extending around the exterior of said inner frame;
- and
- (f) inflatable means disposed around the periphery of said inner frame and including portions thereof extending within both of said first and second channels, for removably holding said inner frame in a predetermined location with respect to said outer frame and permitting a predetermined amount of relative motion of said inner frame with respect to said outer frame.
4 more elements
Dependencies are inferred from the claim text.