# US 9,433,825 B1 · Swimming aid device

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- Number: US 9,433,825 B1
- Document ID: US9433825B1
- Status: Granted
- Kind: B1
- Application number: 14/688,796
- Filed: 2015-04-16
- Granted: 2016-09-06
- Earliest claimed: 2015-04-16
- Applicants: Andrew Nguyen
- Inventors: Andrew Nguyen
- Web page: https://patentgrep.com/patent/US9433825B1

## CPC

- A63B 31/11: attachable only to the feet
- A63B 2209/00: Characteristics of used materials
- A63B 2210/50: Size reducing arrangements for stowing or transport
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

This invention provides center locking means that are manufactured from harder materials for detachably coupling two swim fins for use by a swimmer practicing the dolphin kick. Also, the invention explains how to strengthen the center locking means to preserve longevity of use.

## Claims

### Claim 1

A swimming aid device, comprising:
a first fin made of resilient material;
a second fin made of resilient material;
a center locking means made of harder material;
where each fin has a longitudinal groove on a perimeter edge, said longitudinal groove forming a keyed slot;
where each of said fins has an internal space capable of enclosing a portion of a swimmer's foot;
where each of said fins has an opening leading to said internal space capable of allowing a swimmer to insert a foot through said opening; and
a means for coupling made of harder material where the center locking means is removably used to attach the fins to each other, by sliding an elongated, rectangular key with protruding keyed edges that mate with the correspondingly keyed slot of the longitudinal grooves in the first fin and the second fin.

### Claim 2

The device of claim one, where the coupling means allows the first and second fins to form a monofin, with sufficiently strong coupling to allow a wearer to use the monofin for swimming.

### Claim 3

The device of claim one, where an inner edge of each fin, meaning the edge of the first fin nearest the opposing edge of the second fin and the edge of the second fin nearest the opposing edge of the first fin, as well as the means for coupling, are manufactured of harder materials than the remainder of the fins which are comprised of softer materials.