Abstract: A seat tilting device includes: a bottom plate secured to a seat base; a top plate secured to a seat; a pivot connecting the top plate to the bottom plate; a compression spring surrounding the pivot; and a compression ring surrounding the compression spring, wherein a height of the compression ring is less than a distance between the bottom plate and the top plate, and wherein the compression spring biases the top plate away from the bottom plate.

Abstract: A seat tilting device includes: a bottom plate secured to a seat base; a top plate secured to a seat; a pivot connecting the top plate to the bottom plate; a compression spring surrounding the pivot; and a compression ring surrounding the compression spring, wherein there is space between a bottom surface of the top plate and a top surface of the compression ring such that the top plate may tilt on the pivot until it contacts the top surface of the compression ring and the movement of the top plate is resisted by the compression spring.

Abstract: The present invention is related to a desk structure. The desk structure comprises a writing surface, and a book box which is secured to the writing surface. A plurality of receiver sleeves are integrally molded with the book box. Each receiver sleeve has an outer wall and an inner wall. The inner wall of the receiver sleeve has a slot and a plurality of radially spaced ribs. The inner wall defines an opening. The desk structure further comprises a plurality of legs. Each leg has an upper leg portion. The upper leg portion of each leg is received by the inner wall opening of a corresponding receiver sleeve. Additionally, each upper leg portion includes a detent. The detent is adapted to engage a corresponding inner wall slot when the upper leg portion is received by the inner wall opening of the corresponding receiver sleeve. Thus, the detent both secures the leg to the book box and positions the upper leg portion within the opening.

Abstract: The present invention is related to a desk structure. The desk structure comprises a writing surface, and a book box which is secured to the writing surface. A plurality of receiver sleeves are integrally molded with the book box. Each receiver sleeve has an outer wall and an inner wall. The inner wall of the receiver sleeve has a slot and a plurality of radially spaced ribs. The inner wall defines an opening. The desk structure further comprises a plurality of legs. Each leg has an upper leg portion. The upper leg portion of each leg is received by the inner wall opening of a corresponding receiver sleeve. Additionally, each upper leg portion includes a detent. The detent is adapted to engage a corresponding inner wall slot when the upper leg portion is received by the inner wall opening of the corresponding receiver sleeve. Thus, the detent both secures the leg to the book box and positions the upper leg portion within the opening.