# US 11,999,514 B2 · Drone propeller for preventing complete destruction and drone comprising same

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- Number: US 11,999,514 B2
- Document ID: US11999514B2
- Status: Granted
- Kind: B2
- Application number: 17/921,622
- Filed: 2021-05-27
- Published: 2023-05-25
- Granted: 2024-06-04
- Earliest claimed: 2020-06-03
- Applicants: Min Cheol Lee
- Inventors: Min Cheol Lee
- Web page: https://patentgrep.com/patent/US11999514B2

## CPC

- B64U 10/10: Rotorcrafts
- B64C 39/024: {of the remote controlled vehicle type, i.e. RPV}
- B64U 10/13: Flying platforms
- B64U 30/20: Rotors; Rotor supports
- F16B 21/12: with locking-pins or split-pins thrust into holes
- B64U: UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64C: AEROPLANES; HELICOPTERS
- F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D)

## Abstract

A drone propeller of the present invention includes a plurality of blades and a rotary shaft, wherein the blades comprise a rotation retaining unit connected to the rotary shaft side, a separation and detachment unit that is on the outer side of the blades and is to be separated when damaged, and a breakage inducing unit which connects the rotation retaining unit and the separation and detachment unit and is damaged during a collision.

## Claims

### Claim 1

A drone propeller for preventing complete destruction, the drone propeller comprising:
a plurality of blades; and
a rotary shaft,
wherein each of the blades includes:
a rotation retaining unit connected to the rotary shaft;
a separation and detachment unit which is formed at an outer side of the blade and is separated when damaged; and
a damage inducing unit connecting the rotation retaining unit and the separation and detachment when damaged upon a collision,
wherein the rotation retaining unit and the separation and detachment unit are separated from each other, and the damage inducing unit includes an insertion hole formed in a contact surface of the rotation retaining unit or the separation and detachment unit and an insertion protrusion formed on a contact surface opposite to the contact surface in which the insertion hole is formed so that the insertion protrusion is inserted into the insertion hole to form the blade.

### Claim 2 (depends on 1)

The drone propeller of claim 1, wherein a crack, which is recessed and elongated in a transverse direction of the blade, is formed in the damage inducing unit.

### Claim 3 (depends on 1)

The drone propeller of claim 1, wherein:
the damage inducing unit further includes a fixing pin;
a pinhole is formed to pass through the blade from an outside of a side surface of the blade, in which the insertion hole is formed, to an inside of the blade, in which the insertion hole is positioned, such that the fixing pin is inserted therein; and
a pin holder recessed to accommodate a portion of the fixing pin passing through the pinhole is formed in the insertion protrusion.

### Claim 4 (depends on 1)

The drone propeller of claim 1, wherein the damage inducing unit includes an insertion protrusion having L shape formed by forming a locking protrusion formed at an end portion of the insertion protrusion and a locking projection by which the locking protrusion is caught when the insertion protrusion is inserted into the insertion hole.

### Claim 5 (depends on 4)

The drone propeller of claim 4, wherein the damage induction unit further includes a locking projection accommodation portion and a restoration spring for restoring the locking projection, and a locking projection pivoting shaft is formed at a peripheral portion of the locking projection such that the locking projection is rotatable so that, when the locking protrusion is pushed, the locking projection is pushed into the locking projection accommodation portion, and when the locking protrusion is completely inserted, the locking projection is restored again.

### Claim 6 (depends on 4)

The drone propeller of claim 4, wherein: a locking projection made of a leaf spring material is formed as the locking projection; and
an outer end of the locking projection is fixed to a wall surface of the insertion hole, and an inner end thereof is lifted to form a projection by which the locking protrusion is caught.

### Claim 7 (depends on 1)

A drone comprising the drone propeller for preventing complete destruction of claim 1.