For families where a young child, is not without interest, perhaps, will be the proposed revision of the pram. Quite a simple upgrade allows one person to easily raise or lower at an ordinary flight of stairs in doorways or subways.
The essence of the revision is clear from the figure. The main additional detail that you want to make, — the extendible frame with small rollers (wheels of a broken baby cars or strollers for dolls), In the retracted position of the frame is underneath and in front of the flight of stairs extends and is fixed in working position — in front of the stroller. With the approach of the main wheels to the first rung of the rollers of the frame be at the level of the third step and are getting used to it. Relying on them and lifting the handle of the stroller, moving the CE wheels on the first step. Now you can rely on them and tilt the wheelchair back frame with rollers will be on the next step, the cycle will repeat. The oscillation angle of the stroller does not exceed 12°, which does not mind being in her baby.