Easy to use portable manual standing wheelchair with safety features and for outdoor use

A standing wheelchair comprising:

• a. a chassis having a first end and a rear end,
• b. a front wheel connected to the front end of the chassis and a pair of rear wheels supporting the wheelchair,
• c. a pivotable seat means of a first link (ab), the said seat pivotable between a generally horizontal seated position and an angled standing position, and having a seating surface and a backrest means of a second link (cd), such that (ab), (bc), (cd) and (da) form a four bar parallelogram link means,
• d. a driver dyad means comprising of four links (be), (ef), (fg) and (bg) which is adapted to actuate the said 4-bar mechanism,
• e. a pair of removably attached side handle actuator means, each handle actuator means connected rigidly to link (ef) of the driver dyad means and cooperatively associated with the 4-bar link means for actuating the seat means between the seated position and standing position,
• f. a lockable knee support means attached to the front end of the said seat means moveable between a lock state and open operational state, and
• g. a pair of side interlocking cam means, each interlocking cam means coupled to the knee support means and the corresponding side handle actuator means for causing the said handle actuator means to move only when the knee support means is in lock state.