IP Library › Granted Patent US 12,377,970
Granted Patent B2
US 12,377,970 · App. 18/683,158 · Granted Aug 5, 2025

Flight device with first main rotor and second main rotor arranged below sub-rotor

Inventors: Mitsuru Ishikawa (Ota, JP); Takahito Sekita (Ota, JP)
Assignee: ISHIKAWA ENERGY RESEARCH CO., LTD.
B64U50/10B64U10/16
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Quick Facts
Patent No.
US 12,377,970
App. No.
18/683,158
Granted
Aug 5, 2025
Kind
B2
Abstract

A flight device that can accurately perform attitude control with a sub-rotor is provided. The flight device 10 includes an airframe 19 , an engine 30 , motors 21 , main rotors 14 , and sub-rotors 15 . The engine 30 rotates the main rotors 14 . The motors 21 rotate the sub-rotors 15 . The main rotors 14 are arranged below the sub-rotors 15 . In the flight device 10 , arranging the main rotors 14 below the sub-rotors 15 prevents the sub-rotors 15 from being affected by an air flow generated by rotation of the main rotors 14 . Accordingly, the sub-rotors 15 can provide thrusts as designed by being rotated, and the position and the attitude of the airframe 19 can be accurately adjusted.

Claims (32)

1. A flight device comprising:

an airframe;

an engine;

a motor;

a main rotor; and

a sub-rotor, wherein

the engine rotates the main rotor,

the motor rotates the sub-rotor, and

the main rotor is arranged below the sub-rotor, the main rotor includes a first main rotor and a second main rotor,

the first main rotor is arranged at a position not overlapping the airframe, on a left side of the airframe, and

the second main rotor is arranged at a position not overlapping the airframe, on a right side of the airframe.

2. The flight device according to claim 1 , wherein the main rotor is arranged above a bottom surface of the airframe.

3. The flight device according to claim 1 , wherein a distance between a rotation center of the sub-rotor and a center of the airframe is longer than a distance between a rotation center of the main rotor and the center of the airframe.

4. The flight device according to claim 1 , wherein

the sub-rotor includes a first sub-rotor, a second sub-rotor, a third sub-rotor, and a fourth sub-rotor,

the first sub-rotor is arranged on a front-left side of the airframe,

the second sub-rotor is arranged on a rear-left side of the airframe,

the third sub-rotor is arranged on a front-right side of the airframe, and

the fourth sub-rotor is arranged on a rear-right side of the airframe.

5. The flight device according to claim 1 , wherein the main rotor and the sub-rotor are arranged at positions where the main rotor and the sub-rotor do not overlap each other.

6. A flight device comprising:

an airframe;

an engine;

a motor;

a main rotor; and

a sub-rotor, wherein

the engine rotates the main rotor,

the motor rotates the sub-rotor,

the main rotor is arranged below the sub-rotor, the main rotor includes a first main rotor and a second main rotor, and is arranged above a bottom surface of the airframe,

the first main rotor is arranged at a position not overlapping the airframe, on a left side of the airframe,

the second main rotor is arranged at a position not overlapping the airframe, on a right side of the airframe, and

a distance between a rotation center of the sub-rotor and a center of the airframe is longer than a distance between a rotation center of the main rotor and the center of the airframe.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 13, 2024
From: ISHIKAWA, MITSURU; SEKITA, TAKAHITO
To: ISHIKAWA ENERGY RESEARCH CO., LTD.
Reel/Frame 066446/0628 →
Priority Claims (1)
JP 2021-182053 · Nov 8, 2021 · national
Continuity (1)
Related Publication 20240343423A1 · Oct 17, 2024
References Cited (17)
US 20150274286A1 · Kereth · 2015 [cited by examiner]
US 20190263519A1 · Argus · 2019 [cited by examiner]
US 20200130822A1 · Dong · 2020 [cited by applicant]
US 20210016880A1 · Ishikawa et al. · 2021 [cited by applicant]
US 20220267000A1 · Zhang · 2022 [cited by examiner]
CN 105836131A · 2016 [cited by applicant]
CN 110422020A · 2019 [cited by applicant]
CN 210882652U · 2020 [cited by applicant]
JP 2011251678A · 2011 [cited by applicant]
JP 201251545A · 2012 [cited by applicant]
JP 2014240242A · 2014 [cited by applicant]
JP 201959362A · 2019 [cited by applicant]
JP 202120674A · 2021 [cited by applicant]
International Search Report dated Nov. 22, 2022, issued in counterpart International Application No. PCT/JP2022/037466, with English Translation. (5 pages). [cited by applicant]
Written Opinion of the International Searching Authority (Form PCT/ISA/237) dated Nov. 22, 2022, issued in counterpart International Application No. PCT/JP2022/037466. (4 pages). [cited by applicant]
International Preliminary Report on Patentability (Form PCT/IPEA/409) of International Application No. PCT/JP2022/037466 dated Mar. 20, 2023. (9 pages). [cited by applicant]
Notice of Reasons for Refusal dated Nov. 30, 2021, issued in counterpart of Japanese Patent Application No. 2021-182053, with English Translation. (7 pages). [cited by applicant]