Patent ID: 8342544

Claim:
An adjustable cart, comprising in combination: a) a base supported by wheels at least one of which is swiveled to allow cart steering travel, b) two frames carried by the base to pivot from active upright positions to stored down positions, one above the other, c) there being upright supports carried by the cart at or proximate cart corners, d) there being mechanism associated with the frames and certain of the supports to releasably lock the frames in upright extended positions relative to the supports in response to frame pivoting to upright positions, e) there being lengthwise adjustable means, associated with each frame, whereby said mechanism is un-blocked to allow frame folding, f) said mechanism including cam surfaces on the supports and on the frame that are interengageable to displace lock elements toward locking positions, g) cam surfaces being interengageable as the frames pivot into upright position, h) said surfaces being relatively angled to elevate the frames during the final 20° of frame pivoting into upright positions.