Seat cushion pumping device for vehicle

A seat cushion pumping device for a vehicle, adapted for adjusting a height of a seat cushion, comprising:

• a clutch section arranged between a clutch cover and one surface of a base member to generate operating force required for adjusting a height of the seat cushion;
• and
• a brake section arranged between a brake cover and the other surface of the base member to conserve operating force of the clutch section;
• wherein the clutch section includes a pair of clutch blocks accommodated in a clutch groove defined on one surface of the base member;
• a lever block interposed between the pair of clutch blocks to operate them;
• and a lever coupled with the lever block and having a lever spring;
• and
• wherein the brake section includes a link connection gear secured around a shaft extending through a shaft hole defined in the brake cover, and meshed with a gear of link means;
• an operating plate secured around the shaft while being positioned between the link connection gear and the base member, and accommodated in a brake groove defined on the brake cover, the operating plate having flattened portions and being defined at both ends of the flattened portion with a pair of inclined wedge-shaped grooves;
• power transmitting projections integrally formed on the other surface of the base member, and fitted into grooves defined on a circumferential outer surface of the operating plate to transmit operating force of the clutch section to the operating plate;
• brake pins each accommodated in a space defined between the inclined wedge-shaped groove and the brake cover to transmit operating force of the base member only in an operating direction and prevent operating force transmission in a reverse direction;
• brake springs each installed between two brake pins to be capable of fixedly maintaining the brake pins in the space defined between the inclined wedge-shaped groove and the brake cover;
• and pushing pins integrally formed at both sides of the power transmitting projections to free the brake pins when the lever is returned to its original position.