# US 10,974,100 B2 · Racket and grommet

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- Number: US 10,974,100 B2
- Document ID: US10974100B2
- Status: Granted
- Kind: B2
- Application number: 16/306,779
- Filed: 2017-04-27
- Published: 2019-05-02
- Granted: 2021-04-13
- Earliest claimed: 2016-06-03
- Assignees: Yonex Kabushiki Kaisha
- Applicants: Yonex Kabushiki Kaisha
- Inventors: Naoto Ogawa; Masato Kawabata; Hitoshi Kato; Tsutomu Takahashi
- Web page: https://patentgrep.com/patent/US10974100B2

## CPC

- A63B 49/022: String guides on frames, e.g. grommets
- A63B 49/02: Frames
- A63B 60/006: {Surfaces specially adapted for reducing air resistance}
- A63B 2049/0217: {with variable thickness of the head in the string plane}
- A63B 2102/02: Tennis
- A63B 2102/04: Badminton
- A63B 2102/06: Squash
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A racket includes: a grip; an annular frame; and a shaft coupling the grip and the frame together; wherein a projection is provided to an outer peripheral face on a leading end half of the frame in a predetermined range including a location of maximum curvature in a peripheral direction.

## Claims

### Claim 1

A tennis racket comprising:
a grip;
an annular frame;
a shaft coupling the grip and the frame together;
wherein a projection is provided to an outer peripheral face on a leading end half of the frame in a predetermined range including a location of maximum curvature in a peripheral direction;
wherein the projection has a width in the peripheral direction wider at a position at a central side of the projection in a thickness direction, which is orthogonal to a hitting face formed inside the frame, than at a position at an end side of the projection in the thickness direction; and
wherein:
a grommet is attached to an outer periphery of the frame; and the grommet includes a recess configured to fit together with the projection of the frame on a back face of the grommet, which is a side of the grommet opposing the frame, and includes a protrusion formed to correspond to the recess on a front face of the grommet, which is the opposite side to the back face.

### Claim 2

A tennis racket comprising:
a grip;
an annular frame;
a shaft coupling the grip and the frame together;
wherein a projection is provided to an outer peripheral face on a leading end half of the frame in a predetermined range including a location of maximum curvature in a peripheral direction;
wherein the projection has a width in the peripheral direction wider at a position at a central side of the projection in a thickness direction, which is orthogonal to a hitting face formed inside the frame, than at a position at an end side of the projection in the thickness direction;
wherein a height of the projection is 0.5 mm or lower; and
wherein:
a grommet is attached to an outer periphery of the frame; and the grommet includes a recess configured to fit together with the projection of the frame on a back face of the grommet, which is a side of the grommet opposing the frame, and includes a protrusion formed to correspond to the recess on a front face of the grommet, which is the opposite side to the back face.