# US 2021/0275855 A1 · Tandem sit-up device

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- Number: US 2021/0275855 A1
- Document ID: US20210275855A1
- Status: Published application
- Kind: A1
- Application number: 16/811,643
- Filed: 2020-03-06
- Published: 2021-09-09
- Earliest claimed: 2020-03-06
- Inventors: Justin Ray Dean
- Web page: https://patentgrep.com/patent/US20210275855A1

## CPC

- A63B 21/28: Devices for two persons operating in opposition {or in cooperation}
- A63B 21/4015: {to the foot}
- A63B 23/0211: {moving torso with immobilized lower limbs}
- A63B 2210/50: Size reducing arrangements for stowing or transport
- 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 tandem sit-up device is provided. The tandem sit-up device has two support frameworks pivotably interconnected by a pivot bar so that the device moves between a flat, operable condition and a folded, storage condition. A distal end of the support framework may provide a seat portion. The pivot bar may provide an inner disc and outer disc rotatable relative to each other for moving between the operable and storage conditions. Each disc type provides a pair of arms for a proximal end of each support framework to selectively attach to so that a distance between the associated seat portion and a foot strap supported by the pair of arms.

## Claims

### Claim 1

A tandem sit-up device, comprising:
two support frameworks interconnected by a pivot assembly so that the two support frameworks move between an operable condition and a folded storage condition;
the pivot assembly comprising:
a pivot bar;
an inner disc rotatably connected to an outer disc on each end of the pivot bar; and
the proximal end operatively associated with each inner disc and each outer disc;
each support framework extends between a distal end and a proximal end operatively associating with the pivot assembly;
a seat portion connected to each distal end; and
a foot strap provided adjacent to each proximal end,
whereby a human user seated on the seat portion engages their feet with the foot strap adjacent thereto to do a sit-up.

### Claim 2

(canceled)

### Claim 3 (depends on 1)

The tandem sit-up device of claim 1, further comprising:
an inner pin cavity provided by each inner disc;
an outer pin cavity provided by each outer disc;
a spring in each inner cavity;
a locking pin that engages the spring and extends into the outer pin cavity in a locked engagement between the outer and inner discs; and
an unlocking button operatively associated with each locking pin for urging the locking pin against the spring and out of the outer pin cavity in an unlocked engagement, enabling the outer and inner discs to rotate relative to each other.

### Claim 4 (depends on 1)

The tandem sit-up device of claim 1, further comprising:
an arm radially extending from each inner and outer disc.

### Claim 5 (depends on 4)

The tandem sit-up device of claim 4, wherein each support framework comprises two spaced apart frame elements;
each arm telescopically engages one of the two spaced apart frame elements; and
a snap button provided by at least one of the two spaced apart frame elements for selectively engaging one of a plurality of adjustment holes provided along a length of at least two of the arms.

### Claim 6 (depends on 5)

The tandem sit-up device of claim 5, further comprising:
an inner pin cavity provided by each inner disc;
an outer pin cavity provided by each outer disc;
a spring in each inner cavity;
a locking pin that engages the spring and extends into the outer pin cavity in a locked engagement between the outer and inner discs; and
an unlocking button operatively associated with each locking pin for urging the locking pin against the spring and out of the outer pin cavity in an unlocked engagement, enabling the outer and inner discs to rotate relative to each other.