Patent ID: 9469219
Filing Date: 2016-10-18
CPC Classification: B60N

Claim Text:
1. A pumping device for a vehicle seat, comprising: a clutch portion transferring rotational force input from a handle lever to an output gear; a brake portion fixing the output gear; a cylindrical front housing accommodating the clutch portion and the brake portion therein and having a pair of stoppers formed on an outer side surface thereof so as to be spaced apart from each other at a predetermined interval; a lever bracket having a pair of bracket legs provided radially outwardly with respect to the respective stoppers, the lever bracket being rotatably arranged on the outer side surface of the front housing so as to connect the handle lever to the clutch portion; and a return spring having a main body portion configured of a ring-shaped leaf spring and a pair of bending portions formed by bending both end portions of the main body portion so as to extend between the pair of stoppers and the pair of bracket legs, wherein: the front housing comprises a cylindrical large diameter portion and a small diameter portion protruding from a front surface of the large diameter portion so as to form a certain stepped portion; and the main body portion of the return spring is provided outside the small diameter portion, an inner diameter of the main body portion in an initial state is smaller than an outer diameter of the large diameter portion, and an inner diameter of the main body portion in a state in which the lever bracket is maximally rotated is larger than an outer diameter of the small diameter portion.