• Existing seat height adjustment mechanisms in vehicles are complex, costly, and limit under-seat cargo space. These mechanisms require additional mounts for attachment, increasing vehicle weight.
• Scissor mechanisms restrict movement below a reference seat height. Further, Deeply recessed door sills hinder seat swivel motion.
• Commercially available jack assemblies are heavy, lack safety and have uneven weight distribution and high-stress concentrations.
• There is a need for a simpler jack assembly that can adjust seat height and lift objects vertically in both upward and downward directions.

The present invention relates to a jack assembly (100) which allows easy operation of height adjustment of an object. (Fig. 1&2)

• The jack assembly (100) includes a first rack assembly (102) coupled with a threaded rod (104) rotation of which moves the first rack assembly (102) in a horizontal direction.
• The first rack assembly (102) is coupled with a base (106) of an object to be lifted through at least two L-shaped arms (108).
• The base (106) comprises a linear slot in which a second rack assembly (110) is attached.
• Ends of the at least two L-shaped arms (108) are in threaded engagement with the first rack assembly (102) and the second rack assembly (110) through a plurality of pinions, and movement of the first rack assembly (102) in the horizontal direction rotates the at least two L-shaped arms (108) to move the second rack assembly (100) in turn which will move the base (106) of the object in a vertical direction.