US 12,442,427 B2
Reverse force mechanism
Takuya Shimokawa, Shinagawa-ku (JP); and Yuichi Nishikiori, Shinagawa-ku (JP)
Assigned to MEIDENSHA CORPORATION, Tokyo (JP)
Appl. No. 19/116,247
Filed by MEIDENSHA CORPORATION, Tokyo (JP)
PCT Filed Sep. 7, 2023, PCT No. PCT/JP2023/032595
§ 371(c)(1), (2) Date Mar. 27, 2025,
PCT Pub. No. WO2024/070551, PCT Pub. Date Apr. 4, 2024.
Claims priority of application No. 2022-154803 (JP), filed on Sep. 28, 2022.
Prior Publication US 2025/0264143 A1, Aug. 21, 2025
Int. Cl. F16F 3/04 (2006.01); F16F 15/067 (2006.01); H01G 5/16 (2006.01)
CPC F16F 3/04 (2013.01) [F16F 15/067 (2013.01); F16F 2228/063 (2013.01); F16F 2232/08 (2013.01); F16F 2236/04 (2013.01); F16F 2236/06 (2013.01); H01G 5/16 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A reverse force mechanism structured to be combined with a device having a positive spring constant, and adjust a resultant operating force by applying a reverse force to a point of application of force from the device with a negative spring constant, the reverse force mechanism comprising:
a main shaft supported at both ends thereof for rotation about an axis of the main shaft;
a main link having a first end portion including a hole through which the main shaft is inserted, and a second end portion including a hole;
a movable shaft inserted through the hole of the second end portion of the main link, and structured to travel in an arc trajectory centered on the main shaft and rotate about an axis of the movable shaft;
an actuating link having a first end portion including a hole through which the movable shaft is inserted, and a second end portion including a hole;
a slider extending perpendicular to the main shaft with both ends thereof fixed;
an actuating shaft inserted through the hole of the second end portion of the actuating link, and structured to be guided by the slider to travel in a direction parallel to the slider and rotate about an axis of the actuating shaft;
a spring link having a first end portion including a slot through which the movable shaft is inserted, and a second end portion including a hole;
a spring shaft inserted through the hole of the second end portion of the spring link; and
a reverse force spring attached to the spring link;
wherein the spring shaft is fixed to a position a dimension away in a direction parallel to the slider from a base point on an extension of a line segment from the main shaft to the movable shaft when in an inserted state in which the movable shaft is farthest from a line connecting the main shaft and the actuating shaft;
wherein the dimension is set such that the resultant operating force is constant at a non-zero value; and
wherein an angle between the actuating link and the slider is set to be variable within a range of 25° to 85° during operation.