US 12,491,963 B2
Kind of brake upper pump with adjustable force arm
Yonggang Chen, Cixi (CN)
Assigned to Ningbo Lewis Sports Goods Co., Ltd., Cixi (CN)
Filed by Ningbo Lewis Sports Goods Co., Ltd., Cixi (CN)
Filed on Jul. 3, 2024, as Appl. No. 18/762,893.
Claims priority of application No. 202310871988.8 (CN), filed on Jul. 15, 2023.
Prior Publication US 2025/0019029 A1, Jan. 16, 2025
Int. Cl. B62L 3/02 (2006.01)
CPC B62L 3/023 (2013.01) 8 Claims
OG exemplary drawing
 
1. A brake upper pump with an adjustable force arm, including:
a brake pump body, a brake lever rotatably connected to the brake pump body at a rotation fulcrum position located between a grip input position and a thrust output position, and a piston rod component connected to the brake lever and at least partially extending into the brake pump body;
the grip input position corresponds to a position where a user holds the brake lever, and the thrust output position corresponds to a position where the piston rod component connects to the brake lever;
wherein, an input force arm defined as a distance between the rotation fulcrum position and a force-generating point on the brake lever held by the user, and an output force arm defined as a distance between the rotation fulcrum position and the thrust output position;
a first force arm adjustable mechanism is provided at the rotation fulcrum position, configured to change a rotation center of the brake lever relative to the brake pump body such that:
when the first force arm adjustable mechanism moves the rotation center close to the piston rod component, the input force arm is increased and the output force arm is reduced, thereby increasing the ratio of the input force arm to the output force arm;
when the first force arm adjustable mechanism moves the rotation center away from the piston rod component, the input force arm is reduced and the output force arm is increased, thereby reducing the ratio of the input force arm to the output force arm;
a pivot mechanism is provided at the rotation fulcrum position;
the pivot mechanism includes a rotating connecting shaft, a first rotating bearing installed on the rotating connecting shaft, and a first connecting screw;
wherein, a first connection hole is formed at the connection between the brake pump body and the brake lever, and the rotating connecting shaft is inserted into the first connection hole;
the first connecting screw being configured to limit the first rotating bearing on the rotating connecting shaft, the rotating connecting shaft is at least partially inserted into the first rotating bearing, and an outer wall of the first rotating bearing is adjacent to the brake pump body;
the first force arm adjustable mechanism includes an eccentric hole formed on the rotating connection shaft, and the first connecting screw is assembled into the eccentric hole to form the rotation center;
the rotating connecting shaft is rotatable relative to the first connection hole, thereby changing the position of the eccentric hole, and adjusting the rotation fulcrum position to increase or decrease the ratio of the input force arm to the output force arm.