# US 12,274,921 B2 · Device for connecting a shoe to an interchangeable blade of a fin

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- Number: US 12,274,921 B2
- Document ID: US12274921B2
- Status: Granted
- Kind: B2
- Application number: 17/724,796
- Filed: 2022-04-20
- Published: 2022-10-27
- Granted: 2025-04-15
- Earliest claimed: 2021-04-26
- Assignees: Cressi-Sub S.p.A.
- Applicants: Cressi-Sub S.P.A.
- Inventors: Carlos Alberto Godoy
- Web page: https://patentgrep.com/patent/US12274921B2

## CPC

- A63B 31/11: attachable only to the feet
- A63B 2031/112: {with means facilitating walking, e.g. rectractable, detachable or pivotable blades}
- A63B 2225/09: Adjustable dimensions
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A swim fin comprising an interchangeable blade having at least two longitudinal tabs along the longitudinal perimeter edges thereof, a shoe provided with at least two longitudinal members which extend forwards from the two opposite sides of the shoe, each of the longitudinal members having a longitudinal groove for a removable engagement with a corresponding one of the tabs, wherein the longitudinal groove extends up to a front end of the longitudinal member, wherein each of said longitudinal members has a front terminal made of a more rigid material than the remaining part of the longitudinal member and configured for a shape and force coupling with a corresponding one of the tabs.

## Claims

### Claim 1

A swim fin comprising an interchangeable blade having at least two longitudinal tabs along longitudinal perimeter edges thereof, a shoe provided with at least two longitudinal members which extend forwards from two opposite sides of said shoe, each of said longitudinal members having a longitudinal groove for a removable engagement with a corresponding one of said tabs, said longitudinal groove extending up to a front end of said longitudinal member, wherein each of said longitudinal members has a front terminal made of a more rigid material than the remaining part of said longitudinal member, said front terminal being configured for a shape and force coupling with a corresponding one of said tabs and being fastened in direct contact with said corresponding tab.

### Claim 2 (depends on 1)

The swim fin according to claim 1, wherein said front terminal is elastically deformable for snap fastening onto said tab.

### Claim 3 (depends on 1)

The swim fin according to claim 1, wherein said front terminal defines a front enlargement of said longitudinal member.

### Claim 4 (depends on 1)

The swim fin according to claim 1, wherein said remaining part of said longitudinal member is longitudinally flexible.

### Claim 5 (depends on 1)

The swim fin according to claim 1, wherein said front terminal is a piece that is indissolubly connected to said remaining part of said longitudinal member.

### Claim 6 (depends on 1)

The swim fin according to claim 1, wherein said front terminal is a piece that is applied on said remaining part of said longitudinal member.

### Claim 7 (depends on 1)

The swim fin according to claim 1, wherein said front terminal is glued or moulded onto said remaining part of said longitudinal member.

### Claim 8 (depends on 1)

The swim fin according to claim 1, wherein said front terminal is made of a polypropylene-based material.

### Claim 9 (depends on 1)

The swim fin according to claim 1, wherein said remaining part of said longitudinal member is made of a technical copolymer-based material.

### Claim 10 (depends on 1)

The swim fin according to claim 1, wherein said groove has a “T”-shaped cross section.

### Claim 11 (depends on 1)

The swim fin according to claim 1, wherein said shoe has, in the fitted part, at least one area made of a less rigid material than said longitudinal members.

### Claim 12 (depends on 1)

The swim fin according to claim 1, wherein it has a fixing plate for fixing a root of said blade to said shoe.

### Claim 13 (depends on 1)

The swim fin according to claim 1, wherein said blade is made of carbon fibre.

### Claim 14 (depends on 1)

A method for assembling the fin in accordance with claim 1, wherein the tabs of the blade are first made to slide along the grooves of the remaining parts of the longitudinal members and, after a final position for fixing the blade to the shoe, the front terminals of said longitudinal members are snap fastened onto said tabs of said blade.